Low-loss variable frequency dry-type transformer

Abstract

The application relates to the technical field of transformers, in particular to a low-loss variable-frequency dry-type transformer which comprises a dry-type transformer, a fan is installed on the dry-type transformer, the fan can guide wind to the surface of the dry-type transformer to cool the components in the dry-type transformer, the fan comprises a connecting frame, end plates are arranged at the two ends in the connecting frame, a fan blade is installed between the two end plates, a cleaning assembly is arranged on the connecting frame, and the cleaning assembly is used for cleaning the blades of the fan blade. The low-loss variable-frequency dry-type transformer is characterized in that the matching structure of the inner ring block, the accommodating groove and the symmetrical scraper is used to arrange the fan blade through the gap of the accommodating groove, the inner ring block and the outer ring block can slide along the driving shaft in the axial direction by only sliding the driving handle, the two side scrapers are used to adhere to the surface of the blade, the dust, the flocculation, the oil stains and other impurities adhered to the blade are scraped and cleaned, and the dust accumulated on the blade can be quickly removed.

Description

Technical Field

[0001] This invention relates to the field of transformer technology, and more specifically to a low-loss variable frequency dry-type transformer. Background Technology

[0002] Dry-type transformers are a type of distribution transformer without liquid insulation, unlike conventional oil-immersed transformers. Their core and high- and low-voltage windings are entirely encased in solid, high-temperature resistant insulation material, relying on this solid insulation layer for electrical isolation and protection. This solid insulation structure effectively suppresses electrical anomalies such as localized corona discharge, phase-to-phase short circuits, and short circuits to ground during operation. They offer a high level of operational safety and eliminate the risk of oil leakage or explosion. They are widely used in power supply scenarios with high fire and explosion protection requirements, such as indoor power distribution rooms, high-rise buildings, medical facilities, and data centers. Dry-type transformers rely on natural air convection for heat dissipation. However, due to their limited heat dissipation area, they are prone to excessive temperature rise under full load and overload conditions. Therefore, forced cooling fans are typically installed at the transformer base. These fans accelerate airflow around the equipment, enhancing convective heat transfer and quickly removing heat generated by the core and windings, thus stabilizing the temperature rise and ensuring continuous rated output.

[0003] During the long-term uninterrupted operation of dry-type transformers, dust, lint, and flocculent debris floating in the power distribution room and machine room are continuously drawn into the fan with the airflow and gradually accumulate on the fan blade surface. As the equipment operates for longer periods, the dust and lint become entangled and agglomerated, forming a dense and thick layer of dirt on the fan blade surface and at the blade root. On the one hand, this thick layer of dirt damages the original aerodynamic shape of the fan blades, increases the rotational resistance of the blades, significantly reduces the fan's output airflow under the same driving power, and significantly reduces the forced cooling efficiency. This can easily cause the temperature rise of the dry-type transformer windings to exceed the limit, accelerate the aging and embrittlement of the internal solid insulation materials, and increase the risk of insulation breakdown and equipment failure. On the other hand, uneven dust distribution on the fan blades can generate eccentric loads when the fan rotates at high speed, causing vibration and abnormal operating noise, accelerating fan bearing wear, shortening the service life of the cooling fan, and in severe cases, blocking the air duct, causing localized heat accumulation, and further deteriorating the equipment's operating conditions. Summary of the Invention

[0004] The present invention aims to provide a low-loss variable frequency dry-type transformer to solve the problem that the fan blades accumulate a lot of dust and lint, forming a thick layer of covering on the blade surface, which hinders the rotation of the blades and thus reduces the efficiency of the fan to a certain extent.

[0005] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A low-loss variable frequency dry-type transformer includes a dry-type transformer with a fan installed on it. The fan can direct air to the surface of the dry-type transformer to cool the internal components. The fan includes a connecting frame, with end plates at both ends inside the connecting frame, and fan blades installed between the two end plates; A cleaning component is provided on the connecting frame, which is used to clean the blades of the fan.

[0006] Preferably, the connecting frame has an air inlet on its side and an air outlet on its top. Both end plates are ring-shaped with a gap between them. The blades in the fan blades are straight from left to right. A drive shaft is fixed between the two end plates. A drive source is installed outside the connecting frame, and the output end of the drive source is fixed to one end of the drive shaft.

[0007] Preferably, the cleaning component includes an inner ring block, which is coaxially arranged with the end plate. The surface of the inner ring block has multiple receiving grooves adapted to the fan blades, and the receiving grooves are through-hole.

[0008] Preferably, multiple sets of scrapers are fixed on both sides of the inner ring block, and the scrapers correspond one-to-one with the receiving grooves. That is, a receiving gap is formed between a set of scrapers, and the width of the receiving gap is the same as that of the receiving groove. The fan blades are located inside the corresponding receiving gaps.

[0009] Preferably, an outer ring block is sleeved on the outside of the inner ring block, the outer ring surface of the inner ring block is attached to the inner ring surface of the outer ring block, a limiting block is fixed on the outer ring surface of the inner ring block, and a limiting groove adapted to the limiting block is opened on the inner ring surface of the outer ring block. Both the limiting block and the limiting groove are annular, and the outer wall of the limiting block is attached to the groove wall of the limiting groove.

[0010] Preferably, the outer wall of the outer ring block is fixed with a drive handle, and a sliding groove adapted to the drive handle is provided on one side of the connecting frame, and the drive handle is slidably connected inside the sliding groove.

[0011] Preferably, the drive shaft is provided with a vibration assembly, which includes multiple vibrating elements disposed on the surface of the drive shaft. The multiple vibrating elements are arranged in a ring on the surface of the drive shaft. Each vibrating element is provided with a sleeve on its outside. The vibrating element and the sleeve are coaxially disposed. One end of each sleeve is fixed to the inner ring surface of the inner ring block. Each vibrating element has an outer ring fixed to its outer wall. A return spring is fixed between the outer ring and the corresponding sleeve.

[0012] Preferably, the surface of the drive shaft is provided with multiple slide rails adapted to the vibrating element. The multiple slide rails are arranged in a ring on the surface of the drive shaft, and the vibrating element is slidably connected inside the corresponding slide rail.

[0013] Preferably, a linkage block is fixed to the outer wall of the drive shaft, and a linkage shaft is fixed to the outer wall of the outer ring.

[0014] The beneficial effects of this invention are as follows: 1. By adopting a top-blowing cooling fan structure, relying on the side air intake and top air exhaust of the connecting frame, and with the coaxially set annular end plate and linear blade fan structure, a stable negative pressure is generated by the rotation of the fan blades, realizing the efficient intake, guidance and jetting of outside air. After the airflow is gathered through the fan blade air chamber, it is blown directionally onto the surface of the dry-type transformer components, resulting in uniform heat dissipation coverage and stable ventilation flow. It can continuously and quickly remove the heat generated by the transformer during operation, effectively control the temperature rise of the equipment during operation, and the stable heat dissipation effect can avoid the problem of increased magnetic loss and copper loss of the transformer due to high temperature, and significantly reduce the energy consumption during frequency conversion operation.

[0015] 2. Through the matching structure of the inner ring block, the receiving groove, and the symmetrical scraper, the fan blades are set through the gap of the receiving groove. The operator only needs to slide the inner ring block and the outer ring block laterally along the drive shaft axis by sliding the drive handle. The scrapers on both sides are used to scrape and clean the dust, lint, oil and other impurities attached to the blades. This can quickly remove the dust accumulated on the blades and avoid problems such as increased wind resistance, reduced air volume and poor heat dissipation caused by dust accumulation in the fan.

[0016] 3. During the inner ring block sliding cleaning process, the linkage block on the drive shaft cooperates with the linkage shaft of the outer ring to drive the vibrating component to stretch the return spring. When the linkage shaft is released from the restriction of the linkage block, the return spring quickly rebounds and drives the vibrating component to hit the inner ring block, generating high-frequency micro-vibration. The vibration force can be transmitted to the fan blades, shaking off the stubborn impurities and tightly adhered dust left after the scraper removes them, thus improving the cleanliness of the blades. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the connecting frame of the present invention; Figure 3 This is a schematic diagram of the fan blade structure of the present invention; Figure 4 This is a schematic diagram of the cleaning component of the present invention; Figure 5 This is a schematic diagram of the structure of the vibration component of the present invention.

[0018] In the picture: 10. Dry-type transformer; 11. Fan; 1101. Connecting frame; 1102. End plate; 1103. Fan blade; 1104. Drive source; 1105. Drive shaft; 20. Cleaning component; 21. Inner ring block; 22. Receiving groove; 23. Scraper; 24. Outer ring block; 25. Limiting block; 26. Limiting groove; 27. Drive handle; 30. Vibration assembly; 31. Vibrating component; 32. Sleeve; 33. Outer ring; 34. Return spring; 35. Slide rail; 36. Linkage block; 37. Linkage shaft. Detailed Implementation

[0019] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0020] Reference Appendix Figures 1-5 As shown, a low-loss variable frequency dry-type transformer includes a dry-type transformer 10. The dry-type transformer 10 is prior art and will not be described in detail. A fan 11 is installed on the dry-type transformer 10 to cool down the internal components of the dry-type transformer 10 in order to maintain the performance of the internal components of the dry-type transformer 10.

[0021] The fan 11 includes a connecting frame 1101. An air inlet is provided on the side of the connecting frame 1101, and an air outlet is provided on the top of the connecting frame 1101. That is, the outside air flows into the interior of the connecting frame 1101 through the air inlet and then is discharged through the air outlet, thereby blowing air towards the dry-type transformer 10 in the form of top blowing to cool down the components inside the dry-type transformer 10.

[0022] Both ends of the connecting frame 1101 are provided with end plates 1102. Both end plates 1102 are ring-shaped and coaxially arranged, with a gap between them. A fan blade 1103 is installed between the two end plates 1102. Multiple blades in the fan blade 1103 are in a straight line from left to right, and an air cavity is formed inside the fan blade 1103. When the end plate 1102 rotates, the fan blade 1103 can draw air from the outside of the connecting frame 1101 into the interior of the connecting frame 1101 through the air inlet, and into the air cavity through the blades of the fan blade 1103. Then, the air is discharged upward by the centrifugal force of the fan blade 1103, and discharged to the surface of the dry-type transformer 10 through the air outlet to cool and dissipate heat from the components inside the dry-type transformer 10.

[0023] A drive shaft 1105 is fixed between the two end plates 1102, and the drive shaft 1105 is coaxially arranged with the end plates 1102. The drive shaft 1105 is used to support the end plates 1102 to maintain their stability. A drive source 1104 is installed outside the connecting frame 1101. The output end of the drive source 1104 is fixed to one end of the drive shaft 1105. The output end of the drive source 1104 is used to drive the drive shaft 1105 to rotate, and the drive shaft 1105 drives the end plates 1102 and the fan blades 1103 to rotate, thereby blowing gas onto the surface of the dry-type transformer 10 for cooling.

[0024] A cleaning component 20 is provided on the connecting frame 1101 to clean the surface of the fan blade 1103, thereby maintaining the performance of the fan blade 1103.

[0025] The cleaning component 20 includes an inner ring block 21, which is coaxially arranged with the end plate 1102. The surface of the inner ring block 21 is provided with multiple receiving grooves 22 that are adapted to the blades of the fan blade 1103. The receiving grooves 22 are through-shaped. Multiple sets of scrapers 23 are fixed on both sides of the inner ring block 21, and the scrapers 23 correspond one-to-one with the receiving grooves 22. That is, a receiving gap is formed between a set of scrapers 23, and the width of the receiving gap is the same as that of the receiving groove 22. The blades of the fan blade 1103 are located inside the corresponding receiving gap. When the inner ring block 21 slides laterally along the axial direction of the drive shaft 1105, the blades of the fan blade 1103 move inside the receiving grooves 22, and the scrapers 23 can clean the dirt on the surface of the blades of the fan blade 1103, thereby maintaining the performance of the fan blade 1103.

[0026] An outer ring block 24 is sleeved on the outside of the inner ring block 21. The outer ring block 24 is coaxially arranged with the inner ring block 21. The width of the inner ring block 21 and the outer ring block 24 is the same. The outer ring surface of the inner ring block 21 is attached to the inner ring surface of the outer ring block 24. A limit block 25 is fixed on the outer ring surface of the inner ring block 21. A limit groove 26 adapted to the limit block 25 is opened on the inner ring surface of the outer ring block 24. Both the limit block 25 and the limit groove 26 are annular. The outer wall of the limit block 25 is attached to the groove wall of the limit groove 26. The limit block 25 and the limit groove 26 are used to limit the inner ring block 21 to maintain the stability of the inner ring block 21 when it rotates.

[0027] The outer ring block 24 is fixed with a drive handle 27. A sliding groove adapted to the drive handle 27 is provided on one side of the connecting frame 1101. The drive handle 27 is slidably connected inside the sliding groove. The drive handle 27 can drive the outer ring block 24 and the inner ring block 21 to slide along the axial direction of the drive shaft 1105, so that the scraper 23 cleans the surface of the blade.

[0028] A vibration assembly 30 is provided on the drive shaft 1105 to apply vibration to the outer ring block 24 to shake off dirt adhering to the blade surface.

[0029] The vibration assembly 30 includes multiple vibrating elements 31 disposed on the surface of the drive shaft 1105. The multiple vibrating elements 31 are arranged in a ring on the surface of the drive shaft 1105. Each vibrating element 31 is provided with a sleeve 32 on its outside. The vibrating element 31 and the sleeve 32 are coaxially disposed. One end of each sleeve 32 is fixed to the inner ring surface of the inner ring block 21. Each vibrating element 31 has an outer ring 33 fixed to its outer wall. A return spring 34 is fixed between the outer ring 33 and the corresponding sleeve 32. When the vibrating element 31 is pulled, the vibrating element 31 slides toward the drive shaft 1105. At the same time, the outer ring 33 pulls the return spring 34. When the vibrating element 31 is released from the pull, the return spring 34 drives the outer ring 33 to return to its original position. The outer ring 33 causes the vibrating element 31 to impact the inner ring surface of the inner ring block 21, thereby applying vibration to the fan blade 1103 to vibrate and shake off dirt attached to the surface of the fan blade 1103.

[0030] The surface of the drive shaft 1105 is provided with multiple slide rails 35 that are adapted to the vibrating element 31. The multiple slide rails 35 are arranged in a ring on the surface of the drive shaft 1105, and the vibrating element 31 is slidably connected inside the corresponding slide rail 35. A linkage block 36 is fixed on the outer wall of the drive shaft 1105, and a linkage shaft 37 is fixed on the outer wall of the outer ring 33.

[0031] In use, the fan 11 is installed at the bottom of the dry-type transformer 10. The output end of the drive source 1104 drives the drive shaft 1105 to rotate. The drive shaft 1105 drives the end plate 1102 and the fan blade 1103 to rotate. Due to the rotation of the fan blade 1103, negative pressure is generated. That is, the outside gas flows into the interior of the connecting frame 1101 through the air inlet, then flows into the interior of the air chamber, and then is discharged to the air outlet through the fan blade 1103, and flows from the air outlet to the surface of the dry-type transformer 10.

[0032] When the blades of fan blade 1103 need to be cleaned, the drive source 1104 is turned off, and then the drive handle 27 is pulled to slide along the extension trajectory of the slide groove. The drive handle 27 drives the outer ring block 24 and the inner ring block 21 to slide along the axial direction of the drive shaft 1105, and the scraper 23 removes the dirt attached to the surface of the fan blade 1103. As the inner ring block 21 moves, when the linkage block 36 contacts the linkage shaft 37, the vibrating element 31 will slide towards the drive shaft 1105, and the outer ring 33 will pull the connected return spring 34. As the outer ring block 24 slides, the linkage block 36 disengages from the linkage shaft 37, and the return spring 34 drives the connected vibrating element 31 to return to its original position. The vibrating element 31 then impacts the inner ring surface of the inner ring block 21, thereby applying vibration force to the blade to vibrate and remove the dirt attached to the blade surface.

[0033] The technical solution of the present invention has been described above with reference to 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 can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after such changes or substitutions will all fall within the scope of protection of the present invention.

Claims

1. A low-loss variable frequency dry-type transformer, characterized in that: Includes a dry-type transformer (10), on which a fan (11) is installed. The fan (11) can direct air to the surface of the dry-type transformer (10) to cool the components inside the dry-type transformer (10). The fan (11) includes a connecting frame (1101), and end plates (1102) are provided at both ends of the connecting frame (1101). A fan blade (1103) is installed between the two end plates (1102). A cleaning component (20) is provided on the connecting frame (1101), which is used to clean the blades of the fan blade (1103).

2. The low-loss variable frequency dry-type transformer according to claim 1, characterized in that, The connecting frame (1101) has an air inlet on its side and an air outlet on its top. Both end plates (1102) are ring-shaped and have a gap between them. The blades in the fan blade (1103) are straight from left to right. A drive shaft (1105) is fixed between the two end plates (1102). A drive source (1104) is installed on the outside of the connecting frame (1101). The output end of the drive source (1104) is fixed to one end of the drive shaft (1105).

3. The low-loss variable frequency dry-type transformer according to claim 1, characterized in that, The cleaning component (20) includes an inner ring block (21), which is coaxially arranged with the end plate (1102). The surface of the inner ring block (21) is provided with a plurality of receiving grooves (22) that are adapted to the blades of the fan blade (1103). The receiving grooves (22) are through-shaped.

4. The low-loss variable frequency dry-type transformer according to claim 3, characterized in that, Multiple sets of scrapers (23) are fixed on both sides of the inner ring block (21), and the scrapers (23) correspond one-to-one with the receiving grooves (22). That is, a receiving gap is formed between a set of scrapers (23), and the width of the receiving gap is the same as that of the receiving groove (22). The fan blades (1103) are located inside the corresponding receiving gaps.

5. The low-loss variable frequency dry-type transformer according to claim 4, characterized in that, The outer ring block (24) is sleeved on the outside of the inner ring block (21). The outer ring surface of the inner ring block (21) is attached to the inner ring surface of the outer ring block (24). A limiting block (25) is fixed on the outer ring surface of the inner ring block (21). A limiting groove (26) adapted to the limiting block (25) is opened on the inner ring surface of the outer ring block (24). Both the limiting block (25) and the limiting groove (26) are annular. The outer wall of the limiting block (25) is attached to the groove wall of the limiting groove (26).

6. The low-loss variable frequency dry-type transformer according to claim 5, characterized in that, The outer wall of the outer ring block (24) is fixed with a drive handle (27), and a sliding groove adapted to the drive handle (27) is opened on one side of the connecting frame (1101), and the drive handle (27) is slidably connected inside the sliding groove.

7. The low-loss variable frequency dry-type transformer according to claim 5, characterized in that, The drive shaft (1105) is provided with a vibration assembly (30). The vibration assembly (30) includes multiple vibrating elements (31) disposed on the surface of the drive shaft (1105). The multiple vibrating elements (31) are arranged in a ring on the surface of the drive shaft (1105). Each vibrating element (31) is provided with a sleeve (32) on its outside. The vibrating element (31) and the sleeve (32) are coaxially disposed. One end of each sleeve (32) is fixed to the inner ring surface of the inner ring block (21). Each vibrating element (31) is fixed with an outer ring (33) on its outer wall. A return spring (34) is fixed between the outer ring (33) and the corresponding sleeve (32).

8. The low-loss variable frequency dry-type transformer according to claim 7, characterized in that, The surface of the drive shaft (1105) is provided with multiple slide rails (35) that are adapted to the vibrating element (31). The multiple slide rails (35) are arranged in a ring on the surface of the drive shaft (1105), and the vibrating element (31) is slidably connected inside the corresponding slide rail (35).

9. The low-loss variable frequency dry-type transformer according to claim 8, characterized in that, The outer wall of the drive shaft (1105) is fixed with a linkage block (36), and the outer wall of the outer ring (33) is fixed with a linkage shaft (37).

Images