CN116321958A - An air-cooled static frequency converter - Google Patents

Abstract

The invention discloses an air-cooled static frequency converter, which comprises a frequency converter valve assembly, a control unit and a control unit, wherein the frequency converter valve assembly comprises a crimping heat dissipation device, a silicon controlled rectifier device connected with the crimping heat dissipation device, a capacitor positioned on the crimping heat dissipation device and a silicon controlled rectifier control unit positioned on the crimping heat dissipation device; the cabinet body assembly comprises a frequency converter cabinet piece positioned at the outer side of the frequency converter valve assembly and wiring cabinet pieces positioned at two sides of the frequency converter cabinet piece. According to the invention, the valve group radiator and the silicon controlled devices in the air-cooled static frequency converter cabinet are alternately stacked in turn from bottom to top, so that the structure is compact, the occupied area is small, the space utilization rate is high, and the situation of overheat damage caused by heat accumulation is avoided.

Description

An air-cooled static frequency converter

technical field

The invention relates to the technical field of electric equipment, in particular to an air-cooled static frequency converter.

Background technique

In the occasions where large synchronous motors are used in the fields of electric power, metallurgy, and water conservancy, static frequency converters are often used for driving and speed regulation. As the key electrical equipment of large-scale pumped storage power stations, static frequency converters have the characteristics of rapid start-up and excellent speed regulation performance. , high success rate, strong self-diagnosis ability and other advantages, it is widely used in the start-up of large pumped storage units.

At present, most of the crimping static inverters use a single thyristor and two trapezoidal radiators to form independent modules. The modules are arranged in layers, and the electrical connections are realized through copper bars. The serial air ducts are formed between the radiators of each layer. The heat dissipation conditions of the silicon controlled rectifier at the air inlet position of the series air duct are obviously better than those at the air outlet position, resulting in uneven temperature rise at all levels, so that the heat accumulation of the silicon controlled silicon through the radiator for heat dissipation leads to the problem of overheating damage .

Contents of the invention

The purpose of this section is to outline some aspects of embodiments of the invention and briefly describe some preferred embodiments. Some simplifications or omissions may be made in this section, as well as in the abstract and titles of this application, to avoid obscuring the purpose of this section, abstract and titles, and such simplifications or omissions should not be used to limit the scope of the invention.

In view of the above-mentioned existing air-cooled static frequency converter having the problem of overheating and damage caused by heat accumulation of the thyristor when heat is dissipated through the radiator, the present invention is proposed.

It is therefore an object of the present invention to provide an air-cooled static frequency converter.

In order to solve the above technical problems, the present invention provides the following technical solutions: an air-cooled static frequency converter, including a frequency converter valve assembly, including a crimping heat dissipation device, and a thyristor device connected to the crimping heat dissipation device, located in the The capacitance on the crimping heat dissipation device, and the thyristor control unit located on the crimping heat dissipation device; the cabinet assembly, including the frequency converter cabinet located outside the frequency converter valve assembly, is located in the frequency converter cabinet The wiring cabinet parts on both sides of the parts.

As a preferred solution of the air-cooled static frequency converter of the present invention, wherein: the crimping heat dissipation device and the thyristor device are alternately stacked from bottom to top; the capacitor and the thyristor control unit are integrated in the press Connect to the heat sink.

As a preferred solution of the air-cooled static frequency converter in the present invention, wherein: the crimping heat dissipation device includes a heat conduction substrate, one side of the heat conduction substrate is provided with a boss, and the other side of the heat conduction substrate is evenly arranged with heat dissipation Fins; the size of the boss is larger than the surface of the crimping plate of the power device; the heat dissipation fins and the heat conduction substrate are perpendicular to each other; the heat conduction substrate and the heat dissipation fins are extruded integrally formed structures, There is no gap; the left and right sides of the cooling fins are respectively provided with horizontal serrations in parallel, and the horizontal serrations are arranged asymmetrically and staggered.

As a preferred solution of the air-cooled static frequency converter of the present invention, an intermediate partition is provided between the two heat-conducting substrates and the heat dissipation fins, and a through-flow bus is provided on the intermediate partition; The middle partition, the heat conduction base plate and the heat dissipation fins form a ring-shaped closed air duct; the middle partition and the heat dissipation fins adopt a vacuum welding process.

As a preferred solution of the air-cooled static frequency converter of the present invention, wherein: the air inlet position of the crimping heat dissipation device is also provided with a resistor radiator, the resistor radiator is a surface-mounted radiator, and the resistor The radiator can form an air duct independently.

As a preferred solution of the air-cooled static frequency converter of the present invention, wherein: the valve assembly of the frequency converter also includes a square resistor, and the square resistance is separately integrated on the resistance radiator, and the resistance radiator and the crimping heat dissipation The air ducts of the devices extend in the same direction; the inverter cabinet is provided with an inspection door on one side of the inverter valve assembly.

As a preferred solution of the air-cooled static frequency converter in the present invention, wherein: the frequency converter cabinet includes a frequency converter cabinet body, and an insulating partition is provided inside the frequency converter cabinet body, and the insulating partition will The main body of the inverter cabinet is divided into an air inlet area and an air outlet area, and air holes are provided on the insulating partition, and the crimping heat dissipation device and the resistance radiator are connected to form an air duct, corresponding to the air holes.

As a preferred solution of the air-cooled static inverter of the present invention, wherein: the wiring cabinet part includes a wiring cabinet body, and the wiring cabinet body is provided with an air collecting box; the inverter cabinet body is also provided with an outlet Bellows; the air inlet area includes an air collection box and an air inlet, the air inlet is arranged on the door of the wiring cabinet body, and the air inlet is equipped with shutters; the air outlet area includes an air outlet box and an air outlet, and the air outlet box It includes a wind cover, a negative pressure fan is arranged inside the wind cover, the air outlet is connected to the air outlet of the negative pressure fan, and the air outlet is provided with a barbed wire.

As a preferred solution of the air-cooled static frequency converter of the present invention, wherein: the inside of the frequency converter cabinet body is also provided with an air collection cavity, the air inlet and the air outlet are staggered; the resistance radiator is provided with Sealing foam, the resistance radiator is sealed and connected to the corresponding air hole through the sealing foam, and the resistance radiator is connected to the air collection chamber through the air hole.

As a preferred solution of the air-cooled static frequency converter in the present invention, wherein: the frequency converter cabinet part also includes a wind pressure sensor located inside the frequency converter cabinet body; a temperature probe is also provided inside the frequency converter cabinet body .

Beneficial effects of the present invention: the radiators of the valve group and the thyristor devices in the air-cooled static frequency converter cabinet are alternately stacked from bottom to top, the structure is compact, the floor space is small, the space utilization rate is high, and overheating caused by heat accumulation is avoided damaged condition.

Description of drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the accompanying drawings that need to be used in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For Those of ordinary skill in the art can also obtain other drawings based on these drawings without any creative effort. in:

Fig. 1 is a schematic diagram of the overall structure of the air-cooled static frequency converter of the present invention.

Fig. 2 is a schematic structural diagram of the valve assembly of the frequency converter described in the air-cooled static frequency converter of the present invention.

Fig. 3 is a schematic structural diagram of the frequency converter cabinet described in the air-cooled static frequency converter of the present invention.

Fig. 4 is a schematic structural diagram of the crimping heat dissipation device of the air-cooled static frequency converter of the present invention.

Fig. 5 is a cross-sectional view of the crimping heat dissipation device of the air-cooled static frequency converter of the present invention.

Fig. 6 is a schematic diagram of the structure of the resistance radiator of the air-cooled static frequency converter of the present invention.

Fig. 7 is three views of the air-cooled static frequency converter of the present invention.

Fig. 8 is a schematic diagram of the structure of the insulation partition of the air-cooled static frequency converter of the present invention.

Detailed ways

In order to make the above objects, features and advantages of the present invention more obvious and comprehensible, specific implementations of the present invention will be described in detail below in conjunction with the accompanying drawings.

In the following description, a lot of specific details are set forth in order to fully understand the present invention, but the present invention can also be implemented in other ways different from those described here, and those skilled in the art can do it without departing from the meaning of the present invention. By analogy, the present invention is therefore not limited to the specific examples disclosed below.

Second, "one embodiment" or "an embodiment" referred to herein refers to a specific feature, structure or characteristic that may be included in at least one implementation of the present invention. "In one embodiment" appearing in different places in this specification does not all refer to the same embodiment, nor is it a separate or selective embodiment that is mutually exclusive with other embodiments.

Secondly, the present invention is described in detail in conjunction with schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the cross-sectional view showing the structure of the device will not be partially enlarged according to the general scale, and the schematic diagram is only an example, and it should not be used here. Limit the scope of protection of the present invention. In addition, the three-dimensional space dimensions of length, width and depth should be included in actual production.

Example 1

Referring to FIG. 1 , a schematic diagram of the overall structure of an air-cooled static frequency converter is provided. As shown in FIGS. 1-3 , an air-cooled static frequency converter includes a frequency converter valve assembly 100, a crimping cooling device 101, and a crimping The thyristor device 102 connected to the heat dissipation device 101, the capacitor 103 located on the crimping heat dissipation device 101, and the thyristor control unit 104 located on the crimping heat dissipation device 101; the cabinet assembly 200, including the inverter valve assembly 100 The outer inverter cabinet 201 and the wiring cabinet 202 located on both sides of the inverter cabinet 201, wherein the crimping heat dissipation device 101 can quickly dissipate heat from the thyristor device 102, the capacitor 103 and the thyristor control unit 104, In order to avoid heat accumulation, the inverter cabinet 201 can protect the inverter valve assembly 100 .

Further, the crimping heat dissipation device 101 and the thyristor device 102 are stacked alternately from bottom to top; the capacitor 103 and the thyristor control unit 104 are integrated on the crimping heat dissipation device 101, wherein the crimping heat dissipation device 101 and the silicon controlled rectifier The thyristor devices 102 are alternately stacked from bottom to top so that the crimping heat dissipation device 101 can better dissipate heat from the thyristor device 102, and the capacitor 103 and the thyristor control unit 104 are integrated in the crimping heat dissipation device 101 On the one hand, it makes the structure compact and occupies less space, and the space utilization rate is higher.

Operation process: According to the working conditions of different power levels, select multiple crimping heat dissipation devices 101 and multiple thyristor devices 102 that meet the requirements to be stacked alternately, when the thyristor device 102, capacitor 103 and thyristor control unit 104 When heat is generated during work, the crimping cooling device 101 can quickly dissipate heat to avoid overheating damage caused by heat accumulation, and the inverter cabinet 201 can protect the inverter valve assembly 100 .

Example 2

Referring to Figures 1-6, this embodiment is different from the first embodiment in that: the crimping heat dissipation device 101 includes a thermally conductive substrate 101a, one side of the thermally conductive substrate 101a is provided with a boss 101a-1, and the other side of the thermally conductive substrate 101a is evenly arranged There are heat dissipation fins 101a-2; the size of the boss 101a-1 is larger than the surface of the crimping plate of the power device; the heat dissipation fins 101a-2 and the heat conduction substrate 101a are perpendicular to each other; the heat conduction substrate 101a and the heat dissipation fins 101a-2 are extruded integrally formed structures , there is no gap between the heat conduction substrate 101a and the heat dissipation fins 101a-2; the left and right sides of the heat dissipation fins 101a-2 are respectively provided with horizontal serrations 101a-3 in parallel, and the transverse serrations 101a-3 are arranged asymmetrically and staggered, wherein the boss 101a-1 The size is larger than the surface of the crimping plate of the power device, which is used to improve the crimping effect of the crimping power device. The heat conduction substrate 101a and the heat dissipation fins 101a-2 are extruded integrally formed profile structures, and there is no gap between the heat conduction substrate 101a and the heat dissipation fins 101a-2. The gap can effectively reduce the thermal resistance.

Specifically, an intermediate partition 101a-4 is provided between the two heat-conducting substrates 101a and the heat dissipation fins 101a-2, and the intermediate partition 101a-4 is provided with a flow bus 101a-5; the intermediate partition 101a-4, The heat conduction substrate 101a and the heat dissipation fins 101a-2 form a ring-shaped closed air duct; the middle partition 101a-4 and the heat dissipation fins 101a-2 adopt a vacuum welding process, in which, when the air passes through the ring-shaped closed air duct, a large amount of heat Taken away, the thermal conductivity performance is fully exerted to achieve efficient heat dissipation effect, and the three are tightly combined without gaps, which reduces thermal resistance and improves heat dissipation efficiency; the middle partition 101a-4 and the heat dissipation fin 101a- 2 Vacuum welding process is adopted to ensure that the middle partition plate 101a-4 and the heat dissipation fin 101a-2 are closely attached, which greatly enhances the overall strength of the crimping heat dissipation device 101, and ensures that the crimping force is effectively transmitted when crimping with power devices such as thyristors And without loss, the thermal resistance is further reduced. The middle partition 101a-4 has a flow busbar 101a-5, which is used for the flow of the valve group, which is convenient for system wiring, and does not increase the flow resistance at the same time, making the structure of the valve group more compact and convenient. Install the wiring.

Further, the air inlet position of the crimping heat dissipation device 101 is also provided with a resistor radiator 101b, the resistor radiator 101b is a surface mount radiator, and the resistor radiator 101b can form an air duct independently, wherein the resistor radiator 101b can be formed separately The air duct can dissipate heat faster.

Further, the inverter valve assembly 100 also includes a square resistor 105, the square resistor 105 is separately integrated on the resistance radiator 101b, and the resistance radiator 101b is consistent with the extension direction of the air duct of the crimping heat dissipation device 101; the inverter cabinet 201 is located on the frequency conversion One side of the inverter valve assembly 100 is provided with an inspection door, wherein the installation and maintenance of the inverter valve assembly 100 is facilitated through the inspection door, and the resistor radiator 101b can quickly dissipate heat from the block resistor 105, and the resistor radiator 101b is connected to the crimping The air ducts of the heat dissipation device 101 extend in the same direction, so as to reduce the loss of air volume as much as possible.

All the other structures are the same as in Example 1.

Operation process: the heat conduction substrate 101a of the crimping heat dissipation device 101 is provided with a boss 101a-1, which can improve the crimping effect of the crimping power device and ensure the reliable operation of the power device; the heat conduction substrate 101a and the heat dissipation fin 101a-2 are extruded One-piece profile structure, no gap between the heat conduction substrate 101a and the heat dissipation fins 101a-2, which can effectively reduce the thermal resistance; the middle partition 101a-4 and the heat dissipation fins 101a-2 adopt a vacuum welding process to ensure that the middle partition 101a-4 It fits closely with the cooling fins 101a-2 to further reduce the thermal resistance. The middle partition 101a-4 has a flow bus 101a-5 for the flow of the valve group, which is convenient for system topology wiring and does not increase the flow resistance at the same time; The middle partition 101a-4, the heat conduction base plate 101a and the cooling fins 101a-2 form a ring-shaped closed air channel; the special structure and manufacturing process of the integrated crimping heat sink, when the air passes through the ring-shaped closed air channel, a large amount of heat is carried Go, give full play to the thermal conductivity, achieve efficient heat dissipation, and the three are seamlessly combined, reducing thermal resistance, improving heat dissipation efficiency, ensuring sufficient heat dissipation of power devices, and ensuring reliable operation of equipment; pressure A resistance radiator 101b is also provided at the air inlet position connected to the heat dissipation device 101. The resistance radiator 101b is a surface-mounted radiator designed to dissipate heat for the resistance device. Reduce the air volume loss as much as possible; the resistance device and the capacitor in Embodiment 1 form an RC loop, which plays the functions of voltage equalization and distribution among power devices, limiting commutation voltage stress and providing AC energy harvesting for the thyristor control unit; The inverter cabinet 201 is provided with an inspection door on one side of the inverter valve assembly 100 , through which the installation and maintenance of the inverter valve assembly 100 is facilitated.

Example 3

1-8, this embodiment is different from the above embodiments in that: the frequency converter cabinet 201 includes a frequency converter cabinet body 201a, and the inside of the frequency converter cabinet body 201a is provided with an insulating partition 201a-1, and the insulating partition 201a- 1 Divide the inverter cabinet body 201a into an air inlet area and an air outlet area, and the insulating partition 201a-1 is provided with an air hole 201a-2, and the crimping heat dissipation device 101 and the resistance radiator 101b are connected to form an air duct, corresponding to the air holes 201a-2, wherein, the air inlet area and the air outlet area are completely sealed and separated, so that the air can circulate better.

Further, the junction cabinet part 202 includes a junction cabinet body 202a, and the junction cabinet body 202a is provided with an air collecting box 202a-1; the inverter cabinet body 201a is also provided with an air outlet box 201a-3; and the air inlet, the air inlet is arranged on the door of the junction cabinet body 202a, and the air inlet is equipped with shutters; the air outlet area includes the air outlet box 201a-3 and the air outlet, and the air outlet box 201a-3 includes an air cover, and the air outlet is provided with Negative pressure fan, the air outlet is connected to the air outlet of the negative pressure fan, and the air outlet is provided with barbed wire, wherein, after the negative pressure fan works, negative pressure is generated in the air outlet area, and the air passes through the air collecting box 202a-1 from the air inlet louvers in turn , the air hole 201a-2 on the insulating partition 201a-1, the resistance radiator 101b, the crimping heat dissipation device 101 and the air outlet box 201a-3, and then discharged from the air outlet, so that the air is as uniform as possible, ensuring that all levels are controllable Silicon temperature rise consistency.

Furthermore, the inside of the frequency converter cabinet body 201a is also provided with an air collection cavity 201a-4, and the air inlet and the air outlet are staggered; the resistance radiator 101b is provided with a sealing foam 101b-1, and the resistance radiator 101b passes through the sealing foam 101b -1 is sealed and connected with the corresponding air hole 201a-2, and the resistance radiator 101b communicates with the air collecting chamber 201a-4 through the air hole 201a-2, wherein, the air inlet and the air outlet are staggered, which can effectively prevent the hot air exchange, that is Prevent the hot air from the air outlet from re-entering the air inlet, thereby greatly improving the heat dissipation effect. Among them, the air inlet and the air outlet are staggered, which can effectively prevent hot air circulation, that is, prevent the hot air from the air outlet from re-entering the air inlet, thereby greatly improving the cooling effect. Improved heat dissipation.

Further, the inverter cabinet 201 also includes a wind pressure sensor 201b located inside the inverter cabinet body 201a; a temperature probe is also provided inside the inverter cabinet body 201a, wherein the air duct of the radiator can be detected in real time through the wind pressure sensor 201b The pressure and temperature probes on both sides can detect the air temperature in the air collecting chamber 201a-4 in real time, so that if the temperature is too high, the operation of the equipment will be stopped.

All the other structures are the same as in Example 2.

Operation process: the insulating partition 201a-1 separates the inverter cabinet 201 into an air inlet area and an air outlet area, the air inlet area and the air outlet area are completely sealed and separated, and the insulating partition 201a-1 is provided with an air hole 201a- 2. The crimping heat dissipation device 101 and the resistance radiator 101b are connected to form an air duct, corresponding to the air holes 201a-2; the air inlet area includes the air collecting box 202a-1 and the air inlet, and the air inlet is arranged on the door of the wiring cabinet 202, and the air inlet Blinds are installed; the air outlet area includes an air outlet box 201a-3 and an air outlet, the air outlet box 201a-3 includes an air cover, and a negative pressure fan is arranged in the air cover; after the negative pressure fan works, the air outlet area generates negative pressure, The air passes through the air inlet louvers in turn through the air collecting box 202a-1, the air hole 201a-2 on the insulating partition 201a-1, the resistance radiator 101b, the crimping heat dissipation device 101 and the air outlet box 201a-3, and then is discharged from the air outlet The air inlet and the air outlet are staggered, which can effectively prevent hot air circulation, that is, prevent the hot air from the air outlet from entering the air inlet again, thereby greatly improving the effect of heat dissipation; the inside of the inverter cabinet body 201a is also provided with a wind pressure sensor 201b and temperature probes to detect the pressure on both sides of the radiator air duct and the air temperature in the air collecting chamber 201a-4 in real time, so as to stop the operation of the equipment in time when the wind pressure and temperature are abnormal.

It is important to note that the construction and arrangement of the application, shown in the various exemplary embodiments, are illustrative only. Although only a few embodiments have been described in detail in this disclosure, it should be readily apparent to those who review this disclosure that many modifications are possible without materially departing from the novel teachings and advantages of the subject matter described in this application. are possible (e.g., variations in dimensions, dimensions, structures, shapes and proportions of various elements, as well as parameter values (e.g., temperature, pressure, etc.), mounting arrangements, use of materials, colors, orientations, etc.). For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be inverted or otherwise varied, and the nature or number or positions of discrete elements may be altered or varied. Accordingly, all such modifications are intended to be included within the scope of this invention. The order or sequence of any process or method steps may be varied or re-sequenced according to alternative embodiments. In the claims, any "means-plus-function" clause is intended to cover the structures described herein as performing the recited function and not only structural equivalents but also equivalent structures. Other substitutions, modifications, changes and omissions may be made in the design, operation and arrangement of the exemplary embodiments without departing from the scope of the invention. Accordingly, the invention is not limited to a particular embodiment, but extends to various modifications still falling within the scope of the appended claims.

Moreover, in order to provide a concise description of exemplary embodiments, not all features of an actual embodiment (i.e., those features not relevant to the best mode presently considered for carrying out the invention, or to practicing the invention feature).

It should be appreciated that during the development of any actual implementation, as in any engineering or design project, numerous implementation-specific decisions may be made. Such a development effort would be complex and time-consuming, but would be a routine matter of design, fabrication, and production without undue experimentation to those of ordinary skill having the benefit of this disclosure .

It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention without limitation, although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be carried out Modifications or equivalent replacements without departing from the spirit and scope of the technical solution of the present invention shall be covered by the claims of the present invention.

Claims (10)

1. An air-cooled static frequency converter, which is characterized in that: comprising the steps of (a) a step of,

a transducer valve assembly (100) comprising a crimping heat sink (101), a thyristor device (102) coupled to the crimping heat sink (101), a capacitor (103) located on the crimping heat sink (101), and a thyristor control unit (104) located on the crimping heat sink (101);

the cabinet body assembly (200) comprises a frequency converter cabinet piece (201) positioned at the outer side of the frequency converter valve assembly (100), and wiring cabinet pieces (202) positioned at two sides of the frequency converter cabinet piece (201).

2. The air-cooled stationary frequency converter of claim 1, wherein: the crimping heat dissipation device (101) and the silicon controlled device (102) are alternately stacked in sequence from bottom to top;

the capacitor (103) and the thyristor control unit (104) are integrated on the crimping heat dissipation device (101).

3. The air-cooled stationary frequency converter according to claim 1 or 2, wherein: the crimping heat dissipation device (101) comprises a heat conduction substrate (101 a), wherein a boss (101 a-1) is arranged on one side of the heat conduction substrate (101 a), and heat dissipation fins (101 a-2) are uniformly arranged on the other side of the heat conduction substrate (101 a);

the size of the boss (101 a-1) is larger than that of the crimping disc surface of the power device;

the radiating fins (101 a-2) and the heat conducting substrate (101 a) are perpendicular to each other;

the heat conducting base plate (101 a) and the radiating fins (101 a-2) are of an extrusion integrated structure, and no gap exists between the heat conducting base plate (101 a) and the radiating fins (101 a-2);

the left side and the right side of the radiating fin (101 a-2) are respectively provided with transverse sawteeth (101 a-3) in parallel, and the transverse sawteeth (101 a-3) are asymmetrically staggered.

4. An air cooled stationary frequency converter according to claim 3, wherein: an intermediate partition board (101 a-4) is further arranged between the two heat conducting substrates (101 a) and the radiating fins (101 a-2), and a through-flow bus (101 a-5) is arranged on the intermediate partition board (101 a-4);

the middle partition plate (101 a-4), the heat conducting base plate (101 a) and the radiating fins (101 a-2) form a ring-shaped closed air duct;

the middle partition plate (101 a-4) and the radiating fins (101 a-2) adopt a vacuum welding process.

5. The air-cooled stationary frequency converter of claim 4, wherein: the air inlet position of the crimping heat dissipation device (101) is also provided with a resistance radiator (101 b), the resistance radiator (101 b) is a surface-mounted radiator, and the resistance radiator (101 b) can form an air duct independently.

6. The air-cooled stationary frequency converter of claim 5, wherein: the frequency converter valve assembly (100) further comprises a square resistor (105), wherein the square resistor (105) is independently integrated on the resistor radiator (101 b), and the extension direction of the resistor radiator (101 b) and the air duct of the crimping radiating device (101) are consistent;

an access door is arranged on one side of the frequency converter cabinet (201) located on the frequency converter valve assembly (100).

7. The air-cooled stationary frequency converter of claim 6, wherein: the frequency converter cabinet piece (201) comprises a frequency converter cabinet body (201 a), an insulating partition board (201 a-1) is arranged in the frequency converter cabinet body (201 a), the frequency converter cabinet body (201 a) is divided into an air inlet area and an air outlet area by the insulating partition board (201 a-1), air holes (201 a-2) are formed in the insulating partition board (201 a-1), and the pressure welding heat dissipation devices (101) and the resistance heat radiators (101 b) are connected to form air duct one-to-one air holes (201 a-2).

8. The air-cooled stationary frequency converter of claim 7, wherein: the wiring cabinet piece (202) comprises a wiring cabinet body (202 a), and a wind collecting box (202 a-1) is arranged on the wiring cabinet body (202 a);

the frequency converter cabinet body (201 a) is also provided with an air outlet box (201 a-3);

the air inlet area comprises an air collecting box (202 a-1) and an air inlet, the air inlet is arranged on a door of the wiring cabinet body (202 a), and the air inlet is provided with a shutter;

the air outlet area comprises an air outlet box (201 a-3) and an air outlet, the air outlet box (201 a-3) comprises an air housing, a negative pressure fan is arranged in the air housing, the air outlet is connected to an air outlet of the negative pressure fan, and an iron wire net is arranged at the air outlet.

9. The air-cooled stationary frequency converter of claim 8, wherein: the inside of the frequency converter cabinet body (201 a) is also provided with an air collecting cavity (201 a-4), and the air inlet and the air outlet are staggered;

the resistor radiator (101 b) is provided with sealing foam (101 b-1), the resistor radiator (101 b) is connected with a corresponding air hole (201 a-2) in a sealing mode through the sealing foam (101 b-1), and the resistor radiator (101 b) is communicated with the air collecting cavity (201 a-4) through the air hole (201 a-2).

10. The air-cooled stationary frequency converter of claim 9, wherein: the frequency converter cabinet (201) further comprises a wind pressure sensor (201 b) positioned inside the frequency converter cabinet body (201 a);

the inside of converter cabinet body (201 a) still is equipped with temperature probe.

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