Oil cooling unit of high-voltage frequency converter

Abstract

The invention discloses a high-voltage frequency converter oil cooling unit, relates to the technical field of frequency converter heat dissipation, solves the problem of cooling oil solidification, and comprises a frequency converter shell, one side of the frequency converter shell is connected with a transmission structure, the transmission structure comprises an oil delivery pump, and the oil delivery pump drives a draft fan and a transmission screw to rotate through transmission. The output end of the oil delivery pump is connected with a flow guide oil pipe, an oil body grinding assembly is installed at the joint of the flow guide oil pipe and the oil delivery pump and comprises a movable lantern ring, the movable lantern ring is arranged on one side of the flow guide oil pipe in a sleeving mode, a grinding ball is arranged in the movable lantern ring, and the grinding ball grinds solidified oil bodies. A dredging insertion rod is mounted on one side of the interior of the movable lantern ring, and the dredging insertion rod dredges the oil pipe; the problems of solidification and volatilization of cooling oil in a low-temperature environment are effectively delayed in a mechanical transmission mode.

Description

Technical Field

[0001] The invention belongs to the technical field of frequency converter heat dissipation, in particular to an oil-cooling unit for a high-voltage frequency converter. Background Art

[0002] In gas power plants, high-voltage inverters are key electrical devices used to control and adjust the speed of the motor, thereby optimizing the operating efficiency of the gas turbine. However, high-voltage inverters generate a lot of heat when working. If the heat is not dissipated in time, it may affect the performance and life of the equipment;

[0003] The current publication number is The Chinese patent of a cooling device for a mining AC inverter belongs to the technical field of mining AC inverters. The technical problem to be solved is that the ventilation holes on the inverter will cause dust to enter and the heat cannot be dissipated. The adopted solution is: the cooling device of the mining AC inverter includes an inverter body, a through hole, a mounting plate, a fan, a sealing plate, a lifting device and a sealing mechanism. The cooling device of the mining AC inverter provided by the present invention can blow the blowing frame through the fan, thereby canceling the sealing of the through hole by the sealing plate, and realizing the dissipation of the temperature inside the inverter body. At the same time, the air and dust inside the inverter body can be blown out of the inverter body from the inside of the inverter body to the outside of the inverter body, and the heat and dust inside the inverter body can be further blown out, which solves the problem that the existing inverter has ventilation holes, causing a large amount of dust to enter and is inconvenient to be discharged;

[0004] However, the heat dissipation device of the AC inverter still has the following defects:

[0005] 1. The device uses air cooling technology. After the device stops working, dust will accumulate in the dead corners inside the device. Traditional water cooling can seal the inverter, but its structure is complex and the failure rate is high. It is easy to have problems such as water circulation system blockage, water pump failure, and thermostat failure. In addition, leakage of the water cooling system will directly lead to the scrapping of the inverter and motor, resulting in large losses due to failures.

[0006] The present invention adopts a cooling method of changing water cooling to oil cooling, but the traditional oil cooling has the problem of oil gas leakage, which leads to oil condensation on the surface of the inverter. Because the inverter will vibrate during operation, the sealing of the inverter shell will be affected over time, which will lead to oil volatilization. The volatilization rate of engine oil is usually slow, but under certain conditions, when heated or exposed to air, its volatility will increase. The volatilization rate is related to the quality of the engine oil.

[0007] 2. In addition, oil cooling also has the problem of cooling oil solidifying at low temperatures. Although the traditional method of adding a pour point depressant has a pour point depressant effect, the cooling oil will still solidify when it reaches a certain temperature, and the pour point depressant will dilute the cooling oil and affect the cooling effect. Summary of the invention

[0008] The object of the present invention is to provide a high voltage inverter oil cooling unit to solve the problems raised in the above background technology.

[0009] To achieve the above object, the present invention provides the following technical solutions:

[0010] A high-voltage inverter oil-cooling unit comprises an inverter housing, one side of the inverter housing is connected to a transmission structure, and the transmission structure comprises an oil pump, an exhaust fan and a reciprocating screw, the input end of the oil pump is connected to a guide oil pipe, and an oil body crushing component is installed on the outer wall of the guide oil pipe.

[0011] Among them, the oil body crushing assembly includes a movable ring, and the movable ring is sleeved on one side of the diversion oil pipe. The movable ring is composed of an inner ring and an outer ring, and the inner ring is fixedly connected to the outer wall of the diversion oil pipe, and the outer ring is rotatably connected to the outer wall of the diversion oil pipe. A plurality of crushing balls are installed between the inner ring and the outer ring, and the crushing balls crush the solidified oil body. A dredging rod is installed on one side inside the movable ring, and the dredging rod dredges the oil pipe.

[0012] According to a further technical solution, a first transmission gear is fixedly connected to the outer wall of the movable sleeve, and a second transmission gear is installed on one side of the first transmission gear, and a transmission chain is used to transmit transmission between the second transmission gear and the first transmission gear.

[0013] Among them, a third transmission gear is fixed to the inner side of the second transmission gear through a connecting shaft, and a fourth transmission gear is provided on one side of the third transmission gear, and a fifth transmission gear is provided on one side of the fourth transmission gear. The third transmission gear, the fourth transmission gear and the fifth transmission gear are connected by meshing transmission.

[0014] A further technical solution is that a fan installation hole is embedded on one side of the inverter housing.

[0015] Wherein, one side of the fifth transmission gear is connected to an exhaust fan, and the exhaust fan is installed inside the fan installation hole.

[0016] According to a further technical solution, a reciprocating screw is fixedly connected to one end of the connecting shaft inside the second transmission gear, and a moving scraper is passed through the bottom end of the reciprocating screw, and the moving scraper is installed on the outer wall of the reciprocating screw.

[0017] The moving scraper is provided with four sets of through grooves, through which the oil body passes.

[0018] Wherein, a cabinet interlayer is arranged inside the inverter housing, the movable scraper moves in the cavity between the inverter housing and the cabinet interlayer, and cooling oil is also poured into the cavity.

[0019] According to a further technical solution, a first connection port is embedded on one side of the connection between the guide oil pipe and the movable collar, and a second connection port is embedded on the other side of the connection between the guide oil pipe and the movable collar.

[0020] According to a further technical solution, the interior of the movable collar is hollow and annular, and the contact surfaces of the movable collar and the two sides of the guide oil pipe are sealed by sealing rings.

[0021] Wherein, an oil channel plug is fixed at the middle position of the installation position of the guide oil pipe and the movable sleeve.

[0022] According to a further technical solution, a connecting gear ring is fixed to one side of the interior of the movable collar, and a slope-cutting tooth is provided on the inner side of the connecting gear ring.

[0023] According to a further technical solution, support frames are fixed on both sides of the top of the second connection port, and elastic elements are sleeved on the support frames. The elastic elements are elastic.

[0024] Among them, the top end of the elastic element is connected with a movable strut, and through holes are provided on both sides of the movable strut. The movable strut is slidably connected to the support frame, and a dredging rod is fixed at the middle position of the support frame.

[0025] According to a further technical solution, the top end of the dredging rod is spherical, the bottom end of the dredging rod is sharp, and the dredging rod is arranged in the middle of the second connecting port.

[0026] According to a further technical solution, a plurality of groups of balls are arranged on the surface of the rolling ball, and sliding friction is changed into rolling friction by the balls.

[0027] Beneficial effects of the present invention:

[0028] First, select oil with low freezing point and cold filter point to use with this device to ensure that the oil can still maintain fluidity at low temperatures. The device effectively delays the solidification of cooling oil in low temperature environment through mechanical transmission. Compared with the traditional method of heating oil to improve fluidity, this mechanical transmission method makes the cooling effect better, and solves the volatilization problem of oil through the exhaust fan;

[0029] The inverter is cooled by oil circulation, and the oil vapor volatilized from the cooling oil inside the inverter cabinet is extracted by an exhaust fan. When used in conjunction with the oil cooling system, the volatilized oil vapor can be effectively captured and recovered. In addition, the condensation of oil on the inverter surface can be reduced, and external ventilation of the inverter can be enhanced to ensure the circulation of air on the inverter surface, reduce the residence time of oil vapor in the air, and thus reduce volatilization losses. In addition, the heat on the surface of the oil cooling system can be removed by exhaust to reduce the temperature of the oil vapor, which can further reduce the volatilization of oil vapor.

[0030] Because the cooling oil solidifies first when the temperature approaches the solidification point of the cooling oil, and the oil flow rate slows down and stays in a local area of ​​the circulation system for a long time to solidify, and the electrical components of the inverter generate heat when working, and the temperature inside is higher than the temperature outside, so the cooling oil in the oil-cooling tank solidifies gradually from the outside to the inside. Therefore, the reciprocating screw drive drives the moving scraper to scrape the solidified oil on the inner wall in time in the interlayer between the inverter casing and the cabinet, which can delay the solidification of the oil and thereby improve the overall practicality of the device.

[0031] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 : Schematic diagram of the first three-dimensional appearance structure of the present invention.

[0033] Figure 2 : A first stereoscopic exploded structure schematic diagram of the present invention.

[0034] Figure 3 :The present invention Figure 2 Enlarged structural diagram at A in the middle.

[0035] Figure 4 : A second three-dimensional explosion structure schematic diagram of the present invention.

[0036] Figure 5 : A third three-dimensional explosion structure schematic diagram of the present invention.

[0037] Figure 6 :The present invention Figure 6 Enlarged structural diagram at B in the middle.

[0038] Figure 7 : A fourth three-dimensional exploded structural schematic diagram of the present invention.

[0039] Figure 8 : A three-dimensional cross-sectional schematic diagram of the oil body crushing assembly of the present invention.

[0040] Fig. 9 :The present invention Figure 8 Enlarged structural diagram at point C in the middle.

[0041] Fig.10 : A three-dimensional enlarged schematic diagram of the connection between the dredging rod and the second connecting port of the present invention.

[0042] Fig.11 : A schematic top view of a cross-section of the present invention.

[0043] Fig.12 : Schematic diagram of the rolling ball structure of the present invention.

[0044] Fig.13: Schematic diagram of the prior art.

[0045] Figure numerals: 1. inverter housing; 2. transmission structure; 201. oil pump; 202. oil guide pipe; 203. first transmission gear; 204. transmission chain; 205. second transmission gear; 206. third transmission gear; 207. fourth transmission gear; 208. fifth transmission gear; 209. exhaust fan; 210. reciprocating screw; 211. moving scraper; 3. oil body crushing assembly; 301. movable collar; 302. first connecting port; 303. crushing ball; 304. connecting gear ring; 305. oil channel plug; 306. support frame; 307. elastic element; 308. movable support rod; 309. dredging rod; 310. second connecting port; 4. fan mounting hole; 5. interlayer in cabinet. DETAILED DESCRIPTION

[0046] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0047] In the prior art, air cooling is a common cooling method, such as the public technical document "CN117750708A, a high-voltage inverter water source cooling unit energy-saving cooling system and use method", such as Fig.13 As shown, although the technical solution can generate cold air to cool the inverter unit, it is overly dependent on cooling water, and cooling the water requires additional consumption of more electricity, and the cooling effect is not ideal. The present invention proposes a more efficient cooling unit to replace the above solution.

[0048] Example 1

[0049] like Figure 1-12 As shown in the figure, a high-voltage inverter oil-cooling unit includes an inverter housing 1, one side of the inverter housing 1 is connected to a transmission structure 2, and the transmission structure 2 includes an oil pump 201, an exhaust fan 209 and a reciprocating screw 210, and the input end of the oil pump 201 is connected to a guide oil pipe 202;

[0050] The device uses oil circulation to cool the inverter, and extracts the volatilized oil gas from the cooling oil inside the inverter cabinet through the exhaust fan 209. It is used in conjunction with the oil cooling system to effectively capture and recover the volatilized oil gas. In addition, it can also reduce the condensation of oil on the inverter surface and strengthen the external ventilation of the inverter, ensure the circulation of air on the inverter surface, reduce the retention time of oil gas in the air, and thus reduce the volatilization loss. In addition, the exhaust takes away the heat on the surface of the oil cooling system to reduce the temperature of the oil gas, which can further reduce the volatilization of oil gas.

[0051] Example 2

[0052] The outer wall of the movable ring 301 is fixedly connected with the first transmission gear 203, and the second transmission gear 205 is installed on one side of the first transmission gear 203. The second transmission gear 205 and the first transmission gear 203 are driven by a transmission chain 204.

[0053] Among them, a third transmission gear 206 is fixed to the inner side of the second transmission gear 205 through a coupling shaft, and a fourth transmission gear 207 is provided on one side of the third transmission gear 206, and the fourth transmission gear 207 is rotatably connected to the inverter housing 1, and a fifth transmission gear 208 is provided on one side of the fourth transmission gear 207, and the third transmission gear 206, the fourth transmission gear 207 and the fifth transmission gear 208 are driven by meshing;

[0054] A fan installation hole 4 is embedded on one side of the inverter housing 1.

[0055] One side of the fifth transmission gear 208 is connected to an exhaust fan 209, and the exhaust fan 209 is installed inside the fan installation hole 4;

[0056] A reciprocating screw 210 is fixedly connected to one end of the connecting shaft inside the second transmission gear 205, and a moving scraper 211 is passed through the bottom end of the reciprocating screw 210. The moving scraper 211 is installed on the outer wall of the reciprocating screw 210.

[0057] The moving scraper 211 is provided with four sets of through grooves, through which the oil body passes.

[0058] The inverter housing 1 is provided with a cabinet interlayer 5, the moving scraper 211 moves in the cavity between the inverter housing 1 and the cabinet interlayer 5, and the cooling oil is also poured into the cavity;

[0059] The output end of the oil pump 201 is connected to the cavity between the inverter housing 1 and the interlayer 5 in the cabinet through a pipeline, so that the oil in the cavity can circulate. The fifth transmission gear 208 is fixedly connected to the end of the blade shaft of the exhaust fan 209. When the exhaust fan 209 is composed of a fan housing, a driving motor and a blade shaft, the fifth transmission gear 208 is driven to rotate through the blade shaft when the exhaust fan 209 is running, so that the third transmission gear 206 is driven by the fourth transmission gear 207 to drive the reciprocating screw 210 and the second transmission gear 205 to rotate synchronously. When the reciprocating screw 210 rotates, it drives the moving scraper 211 to reciprocate on the inner side of the interlayer 5 in the cabinet, so as to scrape the solidified oil on the inner wall of the inverter housing 1 and the interlayer 5 in the cabinet, reduce the contact time between the oil and the inner wall of the inverter housing 1 and the interlayer 5 in the cabinet, and then delay the solidification of the oil, thereby improving the overall practicality of the device;

[0060] Because the cooling oil solidifies first when the temperature approaches the solidification point of the cooling oil, and the oil flow speed slows down and stays in a local area of ​​the circulation system for a long time to solidify, and the electrical components of the inverter generate heat when working, and the temperature inside is higher than the temperature outside, so the cooling oil in the oil cooling tank solidifies gradually from the outside to the inside, so the scraping method of the moving scraper 211 can delay the cooling oil solidifying on the side wall;

[0061] Example 3

[0062] The outer wall of the oil pipe 202 is provided with an oil body crushing assembly 3, wherein the oil body crushing assembly 3 comprises a movable sleeve 301, and the movable sleeve 301 is sleeved on one side of the oil pipe 202, the movable sleeve 301 is composed of an inner ring and an outer ring, and the inner ring is fixedly connected to the outer wall of the oil pipe 202, and the outer ring is rotatably connected to the outer wall of the oil pipe 202, and a plurality of crushing balls 303 are installed between the inner ring and the outer ring, and the crushing balls 303 crush the solidified The movable collar 301 is provided with a dredging rod 309 on one side of the inner part thereof, and the dredging rod 309 dredges the oil pipe. A first connection port 302 is inlaid on one side of the connection between the guide oil pipe 202 and the movable collar 301, and a second connection port 310 is inlaid on the other side of the connection between the guide oil pipe 202 and the movable collar 301. The inner part of the movable collar 301 is hollow and annular. The contact surfaces on both sides of the movable collar 301 and the guide oil pipe 202 are sealed by a sealing ring. The invention relates to a sealing device, wherein an oil channel plug 305 is fixed at the middle position of the installation place of the guide oil pipe 202 and the movable collar 301, a connecting tooth ring 304 is fixed on one side of the inside of the movable collar 301, and a cut-slope tooth is provided on the inner side of the connecting tooth ring 304, a support frame 306 is fixed on both sides of the top of the second connecting port 310, and an elastic element 307 is sleeved on the support frame 306, and the elastic element 307 is elastic, wherein a movable strut 308 is connected to the top of the elastic element 307, and through holes are provided on both sides of the movable strut 308, and the movable strut 308 is slidably connected to the support frame 306, and a dredging rod 309 is fixed at the middle position of the support frame 306, the top of the dredging rod 309 is spherical, and the bottom of the dredging rod 309 is sharp, and the dredging rod 309 is arranged in the middle position of the second connecting port 310, and a plurality of groups of balls are provided on the surface of the rolling ball 303, and sliding friction is changed into rolling friction through the balls;

[0063] When the second transmission gear 205 rotates, the transmission chain 204 drives the first transmission gear 203 to drive the outer ring of the movable sleeve 301 to rotate, and then the multiple rolling balls 303 are moved to roll by friction, so that when the oil flows back through the guide oil pipe 202, the oil passes through the second connection port 310 and the multiple rolling balls 303 to roll the agglomerated oil, thereby ensuring the subsequent circulation of the oil. At the same time, the friction of the rolling balls 303 slows down the solidification of the oil, thereby improving the heat conduction effect of the oil, thereby further improving the cooling effect of the electrical components inside the inverter housing 1;

[0064] When the outer ring of the movable sleeve 301 rotates, it drives the connecting gear ring 304 to rotate as well. The connecting gear ring 304 has an inclined groove inside. When the connecting gear ring 304 rotates, the inclined groove on the inner side will drive the unblocking rod 309 to move up and down, and the inner side of the second connecting port 310 will be reciprocated, which can further unblock the oil in the channel, thereby ensuring the fluidity of the oil during the circulation process, thereby further improving the overall practicality of the device.

[0065] In addition, by optimizing the design of the oil pipeline and reducing the length of the oil pipeline, the solidification of the cooling oil can be further avoided. Insulating materials are used for the oil tank, oil pipe, cooling interlayer and other components of the oil-cooled oil circulation system to further reduce heat loss and keep the oil temperature within an appropriate range.

[0066] The high-voltage inverter cooling system used in gas power plants adopts oil-cooled heat dissipation technology. By pouring mineral oil into the body of the heat sink, the thermal conductivity of the oil is used to absorb and dissipate the heat generated by the inverter circuit board. The heat dissipation effect of oil cooling is better than that of air-cooled engines, and the failure rate is lower than that of water-cooled engines. In addition, oil cooling will not damage the inverter and motor in the event of a failure or leakage, but will also play a lubricating role. It also prevents the oil from becoming too thin due to excessive temperature.

[0067] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0068] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementations that can be understood by those skilled in the art.

Claims

1. A high-voltage inverter oil-cooling unit, comprising an inverter housing (1), characterized in that: A transmission structure (2) is connected to one side of the inverter housing (1), and the transmission structure (2) comprises an oil pump (201), an exhaust fan (209), and a reciprocating screw (210). An input end of the oil pump (201) is connected to a flow guide oil pipe (202), and an oil body crushing assembly (3) is installed on the outer wall of the flow guide oil pipe (202). The oil body crushing assembly (3) comprises a movable collar (301), and the movable collar (301) is sleeved on one side of the oil guide pipe (202), the movable collar (301) is composed of an inner ring and an outer ring, and the inner ring is fixedly connected to the outer wall of the oil guide pipe (202), and the outer ring is rotatably connected to the outer wall of the oil guide pipe (202), a plurality of crushing balls (303) are installed between the inner ring and the outer ring, and the crushing balls (303) crush the solidified oil body, and a dredging rod (309) is installed on one side inside the movable collar (301), and the dredging rod (309) dredges the oil pipe.

2. The high-voltage inverter oil-cooling unit according to claim 1 is characterized in that: The outer wall of the movable sleeve (301) is fixedly connected to a first transmission gear (203), and a second transmission gear (205) is installed on one side of the first transmission gear (203). The second transmission gear (205) and the first transmission gear (203) are driven by a transmission chain (204). A third transmission gear (206) is fixed to the inner side of the second transmission gear (205) via a connecting shaft, a fourth transmission gear (207) is provided on one side of the third transmission gear (206), a fifth transmission gear (208) is provided on one side of the fourth transmission gear (207), and the third transmission gear (206), the fourth transmission gear (207) and the fifth transmission gear (208) are connected by meshing transmission.

3. The high-voltage inverter oil-cooling unit according to claim 2 is characterized in that: A fan mounting hole (4) is embedded on one side of the inverter housing (1). Wherein, one side of the fifth transmission gear (208) is connected to an exhaust fan (209), and the exhaust fan (209) is installed inside the fan installation hole (4).

4. The high-voltage inverter oil-cooling unit according to claim 2 is characterized in that: One end of the connecting shaft inside the second transmission gear (205) is fixedly connected to a reciprocating screw rod (210), and a moving scraper (211) penetrates the bottom end of the reciprocating screw rod (210), and the moving scraper (211) is installed on the outer wall of the reciprocating screw rod (210). The moving scraper (211) is provided with four groups of through grooves, through which the oil body passes. The inverter housing (1) is provided with a cabinet inner layer (5) inside, the movable scraper (211) moves in a cavity between the inverter housing (1) and the cabinet inner layer (5), and cooling oil is also poured into the cavity.

5. The high-voltage inverter oil-cooling unit according to claim 1 is characterized in that: A first connection port (302) is embedded on one side of the connection between the guide oil pipe (202) and the movable collar (301), and a second connection port (310) is embedded on the other side of the connection between the guide oil pipe (202) and the movable collar (301).

6. The high-voltage inverter oil-cooling unit according to claim 2 is characterized in that: The interior of the movable collar (301) is hollow and annular, and the contact surfaces on both sides of the movable collar (301) and the oil guide pipe (202) are sealed by sealing rings. An oil channel plug (305) is fixed at a middle position between the installation positions of the guide oil pipe (202) and the movable sleeve ring (301).

7. The high-voltage frequency converter oil-cooling unit according to claim 5, characterized in that: A connecting toothed ring (304) is fixed to one side of the interior of the movable sleeve ring (301), and a slope-cutting tooth is provided on the inner side of the connecting toothed ring (304).

8. The high-voltage inverter oil-cooling unit according to claim 5, characterized in that: Support frames (306) are fixed on both sides of the top of the second connection port (310), and an elastic element (307) is sleeved on the support frame (306). The elastic element (307) is elastic. The top end of the elastic element (307) is connected to a movable support rod (308), and through holes are provided on both sides of the movable support rod (308). The movable support rod (308) is slidably connected to the support frame (306), and a dredging rod (309) is fixed at the middle position of the support frame (306).

9. The high-voltage inverter oil-cooling unit according to claim 8, characterized in that: The top end of the dredging rod (309) is spherical, the bottom end of the dredging rod (309) is sharp, and the dredging rod (309) is arranged in the middle of the second connection port (310).

10. The high voltage inverter oil cooling unit according to claim 1, characterized in that: The surface of the rolling ball (303) is provided with a plurality of groups of rolling balls, and the sliding friction is changed into rolling friction through the rolling balls.

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