阅读说明：本技术 智能化油泵及变压器强迫油循环冷却系统 (Intelligent oil pump and forced oil circulation cooling system of transformer ) 是由 谢栋 黎贤钛 张其强 俞钧 龚智旭 吴善行 于 2021-08-24 设计创作，主要内容包括：智能化油泵,包括壳体、叶轮和电机,壳体内密封安装电机,叶轮固定连接于电机转轴的端部并用于驱动油液的流动,电机还包括电路组件、控制组件和同轴设于转轴外的定子,电路组件电连接定子,电路组件包括连接定子的高速控制电路和低速控制电路,控制组件电连接电路组件并控制高速控制电路和低速控制电路间的切换。该智能油泵提供了在不改变叶轮尺寸的情况下,提高轴承运转寿命的运行模式。可以对油温、绕组温度、轴承振动、轴承旋转次数进行监测,并根据检测结果实时调节其运行模式,增加了油泵的安全性和寿命。对应的,本申请还提供了采用本申请的智能化油泵构建的变压器强迫油循环冷却系统。(Intelligent oil pump, which comprises a housin, impeller and motor, seal installation motor in the casing, impeller fixed connection is in the tip of motor shaft and is used for driving the flow of fluid, the motor still includes circuit module, control assembly and the coaxial stator of locating the pivot outside, the stator is connected to the circuit module electricity, circuit module is including the high speed control circuit and the low speed control circuit of connecting the stator, control assembly electricity connection circuit module controls the switching between high speed control circuit and the low speed control circuit. The intelligent oil pump provides an operation mode for prolonging the service life of the bearing under the condition of not changing the size of the impeller. The oil temperature, the winding temperature, the bearing vibration and the bearing rotation frequency can be monitored, the operation mode of the oil pump can be adjusted in real time according to the detection result, and the safety and the service life of the oil pump are improved. Correspondingly, the application also provides a forced oil circulation cooling system of the transformer constructed by the intelligent oil pump.)

1. Intelligent oil pump, its characterized in that: including casing (7), impeller (6) and motor (1), seal installation in casing (7) motor (1), impeller (6) fixed connection in the tip of motor (1) pivot (14) and be used for driving the flow of fluid, motor (1) still includes circuit module (11), control assembly (12) and coaxial locating stator (13) outside pivot (14), circuit module (11) electricity is connected stator (13), circuit module (11) is including connecting high speed control circuit (111) and low speed control circuit (112) of stator (13), control assembly (12) electricity is connected circuit module (11) and control switching between high speed control circuit (111) and low speed control circuit (112).

2. The intelligent oil pump of claim 1, wherein: the stator (13) is provided with a high-speed winding group (131) and a low-speed winding group (132), the high-speed winding group (131) is electrically connected with the high-speed control circuit (111), and the low-speed winding group (132) is electrically connected with the low-speed control circuit (112).

3. The intelligent oil pump of claim 2, wherein: the high-speed control circuit (111) is in a double-Y-shaped wiring mode, and the low-speed control circuit (112) is in a triangular wiring mode.

4. The intelligent oil pump of claim 3, wherein: and a temperature sensor (5) is arranged in the shell (7), and the temperature sensor (5) is electrically connected with the control component (12).

5. The intelligent oil pump of claim 1, wherein: the vibration sensor is characterized in that a vibration sensing assembly (3) is arranged in the shell (7), and the vibration sensing assembly (3) is electrically connected with the control assembly (12).

6. The intelligent oil pump of claim 5, wherein: the vibration sensing assembly (3) comprises a bearing (31) sleeved on the outer side of the rotating shaft (14) and a vibration sensor (32) connected to the outer side of the bearing (31).

7. The intelligent oil pump of claim 6, wherein: the vibration sensing assembly (3) at least comprises two vibration sensing assemblies which are respectively connected to the two ends of the rotating shaft (14) in the direction.

8. The intelligent oil pump of claim 1, wherein: the rotating shaft (14) is sleeved with a counting sensor (4), and the counting sensor (4) is electrically connected with the control component (12).

9. The intelligent oil pump of claim 8, wherein: the counting sensor (4) is a magnetic counting sensor, and a magnetic component corresponding to the counting sensor (4) is embedded on the rotating shaft (14).

10. Forced oil circulation cooling system of transformer, including the oil pump, its characterized in that: the oil pump is the intelligent oil pump of claim 1.

Technical Field

The application relates to the technical field of oil pumps for transformers, and particularly provides an intelligent oil pump and a forced oil circulation cooling system for transformers constructed by the intelligent oil pump.

Background

The transformer oil pump generally adopts a full-sealing structure and a built-in submersible running three-phase asynchronous motor straight-shaft drive axial-flow type vane pump, and is a fluid machine specially used for conveying transformer insulating oil media. The axial-flow type transformer oil pump is suitable for a transformer finned radiator. For the transformer oil pump, according to the continuously-improved working requirements of various power networks and offices in China at present, in order to prolong the bearing service life of the pump shaft of the transformer oil pump, the original high-rotation-speed oil pump (such as 1500r/min) is generally changed into a low-rotation-speed oil pump (such as below 1000 r/min).

The transformer oil pump of the low-speed motor is required to reach the flow and the lift of the oil pump of the high-speed motor and is solved by increasing the diameter of the impeller. The increase in diameter of the rotating machine results in a decrease in operational stability. In the replacement process, some old cooler installation sizes are to be replaced with existing mating structure sizes, cost, etc. that are not affordable.

Disclosure of Invention

To prior art's weak point, this application provides intelligent oil pump, and the intelligent oil pump of this application can monitor oil temperature, winding temperature, bearing vibration, bearing number of revolutions, has increased the life and the security of oil pump. Correspondingly, the application also provides a forced oil circulation cooling system of the transformer constructed by the intelligent oil pump.

For the oil pump, the concrete technical scheme of this application is as follows:

intelligent oil pump, including casing, impeller and motor, seal installation in the casing the motor, impeller fixed connection in motor shaft's tip is used for driving the flow of fluid, the motor still includes circuit module, control assembly and coaxial locating the outer stator of pivot, circuit module electricity is connected the stator, circuit module is including connecting the high-speed control circuit and the low-speed control circuit of stator, the control assembly electricity is connected circuit module and control switching between high-speed control circuit and low-speed control circuit.

Therefore, in the operation process of the oil pump, the rotating shaft of the motor is controlled to rotate at a high speed/a low speed through the high-speed control circuit and the low-speed control circuit respectively. The high-speed control circuit is defaulted to be operated in a mode with high heat dissipation efficiency at a high speed in a general operation process, and if the problem of influence on stable operation or over-high energy consumption/loss occurs in the high-speed operation process, the low-speed operation under the low-speed control circuit is switched to reduce operation load, so that the normal operation of the oil pump is protected. Under this operating mode of changeable rotational speed, to existing high-speed oil pump in the cooler of current transformer, need not to change the impeller and match the pipeline of this model impeller, only need to change stator and circuit module, the control module among the motor of this application and can realize the purpose of extension running life, saving equipment update cost simultaneously, improve the effect and the stability of operation work.

As a further preferable technical solution of the present application, the stator is provided with a high-speed winding group and a low-speed winding group, the high-speed winding group is electrically connected to the high-speed control circuit, and the low-speed winding group is electrically connected to the low-speed control circuit.

Therefore, the rotating speed control of the motor is realized by arranging different winding groups on the stator and respectively controlling the corresponding winding groups to change the running parameters of the stator by the high-speed control circuit/the low-speed control circuit, so that the complexity of the whole structure is reduced, and the control efficiency and the convenience are improved.

As a further preferable technical solution of the present application, the high-speed control circuit is in a double-Y connection mode, and the low-speed control circuit is in a delta connection mode.

Therefore, on one side of the circuit assembly, high-speed/low-speed switching in the same circuit is realized by adopting two different wiring modes, the structural complexity is reduced, and the switching control efficiency is improved.

As a further preferred technical scheme of this application, be equipped with temperature sensor in the casing, temperature sensor electricity is connected control assembly.

Therefore, temperature control logic is added through the temperature sensor, the temperature of the oil is sampled through the temperature sensor, and when the temperature of the oil exceeds a set value, the oil is operated at a high rotating speed to work with high heat dissipation efficiency; when the temperature of the oil is lower than the set value, the low-speed operation with smaller load (loss) is adopted. Furthermore, when the temperature of the oil exceeds a safety value, an operator can be reminded to carry out troubleshooting and elimination by giving an alarm and/or disconnecting the operation of the oil pump.

As a further preferred technical scheme of this application, be equipped with vibration sensing assembly in the casing, vibration sensing assembly electricity is connected control assembly.

Therefore, the operation stability judgment condition is added to the whole operation logic through the vibration sensing assembly. The vibration detection device is used for detecting the stability of the rotating operation of the rotating shaft, and if the vibration detected by the vibration detection device exceeds a set value, a mode of giving an alarm and/or disconnecting the oil pump from running is adopted to remind an operator to carry out fault maintenance and removal, so that the serious damage to the operator in a high-vibration unstable working environment is avoided.

As a further preferred technical scheme of this application, the vibration sensing subassembly is located including the cover the bearing in the pivot outside and connect in the vibration sensor in the bearing outside.

Therefore, the vibration sensor detects the vibration of the bearing shell to realize the detection of the vibration index. The shell body of the bearing and the vibration sensor are in a relatively static contact state, the influence of rotation action of the rotating shaft is not easy to be caused, and the detection accuracy of vibration is higher.

As a further preferable technical solution of the present application, the vibration sensing assembly includes at least two vibration sensors respectively connected to two ends of the rotating shaft.

Therefore, cross comparison is achieved through vibration induction detection at two ends of the rotating shaft, and vibration detection errors caused by bending (possibly caused by tolerance and bearing) of the rotating shaft in the axial direction are reduced.

As a further preferred technical scheme of this application, the cover is equipped with count sensor in the pivot, count sensor electricity is connected control assembly.

Therefore, the counting sensor is used for detecting the rotating number of turns of the rotating shaft and further used for detecting the service life of the bearing or the service lives of the bearings at two ends of the rotating shaft, for example, when the service life of the rotating number of turns of the bearing reaches, the bearing can be prompted to be replaced.

As a further preferred technical scheme of this application, the count sensor is magnetic count sensor, inlay in the pivot be equipped with the magnetic component that the count sensor corresponds.

Therefore, the revolution detection with high efficiency and less error is realized through the magnetic action, and the influence possibly caused by turbid and constantly stirred oil is reduced.

As a further preferred aspect of the present application, the housing includes at least one outwardly extending connection for connecting an external pipeline.

From this, provide the transformation installation of casing and motor in it in existing transformer substation through connecting portion, need not change the pipeline at impeller and impeller place promptly, only need install the casing through the connecting portion and present the pump structure for axial-flow type in the pipeline promptly, when reducing the transformation expense, guarantee the target realization that prolongs oil pump life-span, and can not influence the parameter index stability of impeller pumping fluid, be convenient for and then control its rotational speed and switch.

For a transformer cooling system, the following technical scheme is provided:

the forced oil circulation cooling system of the transformer comprises an oil pump; the oil pump is aforementioned intelligent oil pump of this application.

The transformer forced oil circulation cooling system of this application adopts aforementioned intelligent oil pump of this application to establish, has increased the life and the security of oil pump.

In summary, the present application has the following beneficial effects:

in the technical scheme of this application, intelligent oil pump provides under the condition that does not change the impeller size, improves bearing life's operational mode. Meanwhile, the intelligent oil pump can monitor the oil temperature, the winding temperature, the bearing vibration and the bearing rotation frequency, and adjust the running mode of the intelligent oil pump in real time according to the detection result, so that the safety and the service life of the oil pump are greatly improved. Furthermore, the design of this intelligence oil pump makes can change spare part less when the old oil pump of renewal, reduces the renewal cost, reduces extravagantly.

Drawings

FIG. 1 is a schematic structural diagram of the present application;

FIG. 2 is a circuit schematic of the circuit assembly and control assembly of the present application;

FIG. 3 is a schematic diagram of a high speed control circuit and a low speed control circuit wiring comparison of the present application;

fig. 4 is a schematic structural view of a high-speed winding group and a low-speed winding group of a stator of the present application;

in the figure, 1-motor, 11-circuit component, 111-high speed control circuit, 112-low speed control circuit, 12-control component, 13-stator, 131-high speed winding group, 132-low speed winding group, 14-rotating shaft, 2-liquid crystal panel, 3-vibration sensing component, 31-bearing, 32-vibration sensor, 4-counting sensor, 5-temperature sensor, 6-impeller, 7-shell, 71-connecting part and 8-external pipeline.

Detailed Description

The technical solution of the present application will be further described by specific embodiments with reference to the accompanying drawings.

Example (b):

as shown in fig. 1, 2, 3, and 4, the intelligent oil pump of the present application includes a housing 7, an impeller 6 and a motor 1, the motor 1 is hermetically installed in the housing 7, the impeller 6 is fixedly connected to an end of a rotating shaft 14 of the motor 1 and is used for driving the flow of oil, and the entire housing 7 with the motor 1 and the impeller 6 is installed in an external pipeline 8 to present an axial-flow oil pump structure. The motor 1 further comprises a circuit assembly 11, a control assembly 12 and a stator 13 coaxially arranged outside the rotating shaft 14. The circuit assembly 11 and the control assembly 12 are further connected with the liquid crystal panel 2, so that the motor running state and various detected parameters detected by the circuit assembly 11 and the control assembly 12 can be visually displayed, and an operator can conveniently recognize and observe the motor running state and the detected parameters. The circuit assembly 11 is electrically connected to the stator 13 and supplies power, the circuit assembly 11 includes a high-speed control circuit 111 and a low-speed control circuit 112 connected to the stator 13, and the control assembly 12 is electrically connected to the circuit assembly 11 and controls switching between the high-speed control circuit 111 and the low-speed control circuit 112. During the operation of the oil pump, the rotating shaft 14 of the motor 1 is controlled to perform high-speed/low-speed rotation operation by the high-speed control circuit 111 and the low-speed control circuit 112 respectively. The normal operation process is defaulted to the operation in a mode with high heat dissipation efficiency at high speed, and if the problem of influence on stable operation or over-high energy consumption/loss occurs in the high-speed operation process, the operation load is reduced by switching to the low-speed operation of the low-speed control circuit 112, so that the normal operation of the oil pump is protected. Under the operation mode of the switchable rotating speed, for the existing high-speed oil pump in the cooler of the existing transformer, the impeller 6 and the pipeline matched with the impeller 6 of the type do not need to be replaced, and the purpose of prolonging the service life can be realized only by replacing the stator 13, the circuit component 11 and the control component 12 in the motor 1, meanwhile, the equipment updating cost is saved, and the operation effect and the stability are improved.

In this embodiment, the stator 13 is provided with a high-speed winding group 131 and a low-speed winding group 132, the high-speed winding group 131 is electrically connected to the high-speed control circuit 111, and the low-speed winding group 132 is electrically connected to the low-speed control circuit 112. The rotation speed control of the motor 1 is realized by arranging different winding groups on the stator 13 and respectively controlling the corresponding winding groups to change the operation parameters of the stator 13 by the high-speed control circuit 111/the low-speed control circuit 112, so that the complexity of the whole structure is reduced, and the control efficiency and the convenience are improved.

In this embodiment, the high-speed control circuit 111 is in a double-Y connection mode, and the low-speed control circuit 112 is in a delta connection mode. On one side of the circuit component 11, two different wiring modes are also adopted to realize high-speed/low-speed switching in the same circuit, so that the structural complexity is reduced, and the switching control efficiency is improved.

In this embodiment, a temperature sensor 5 is disposed in the housing 7, the temperature sensor 5 includes two sets disposed on the surface of the housing 7 and on the stator 13 in this embodiment, and the temperature sensor 5 is electrically connected to the control component 12. Temperature control logic controlled by an oil pump is added through a temperature sensor 5, the temperature of oil is sampled through the temperature control logic, and when the temperature of the oil exceeds a set value, the oil is operated at a high rotating speed to work with high heat dissipation efficiency; when the temperature of the oil is lower than a set value, the low-speed running with low load loss is adopted. Furthermore, when the temperature of the oil exceeds a safety value, an operator can be reminded to carry out troubleshooting and elimination by giving an alarm and/or disconnecting the operation of the oil pump.

In this embodiment, the vibration sensing component 3 is disposed in the housing 7, and the vibration sensing component 3 is electrically connected to the control component 12. And adding an operation stability judgment condition into the whole operation logic through the vibration sensing assembly 3. The vibration detection device is used for detecting the stability of the rotating operation of the rotating shaft 14, and if the vibration frequency or the vibration amplitude detected by the vibration detection device exceeds a set value, an alarm is given out and/or the operation of the oil pump is cut off to remind an operator of carrying out fault maintenance and troubleshooting, so that the serious damage is avoided under the unstable working environment with high vibration.

In this embodiment, the vibration sensing assembly 3 includes a bearing 31 sleeved outside the rotating shaft 14 and a vibration sensor 32 connected outside the bearing 31. The detection of the vibration index is achieved by detecting the vibration of the outer housing of the bearing 31 by the vibration sensor 32. The outer housing of the bearing 31 and the vibration sensor 32 are in a relatively stationary contact state, and are less susceptible to the rotational movement of the rotating shaft 14, and the vibration detection accuracy is higher.

In this embodiment, the vibration sensing component 3 includes at least two components respectively connected to two ends of the rotating shaft 14. The cross-contrast is realized through the vibration induction detection at the two ends of the rotating shaft 14, and the error of vibration detection caused by the bending of the rotating shaft 14 in the axial direction, which is possibly caused by tolerance and bearing, is reduced.

In this embodiment, the rotating shaft 14 is sleeved with the counting sensor 4, and the counting sensor 4 is electrically connected to the control component 12. The counting sensor 4 is used for detecting the number of rotation turns of the rotating shaft 14, and further for detecting the service life of the bearing 31 itself or at both ends thereof, for example, when the service life of the number of rotation turns of the bearing 31 is reached, the replacement of the bearing 31 can be prompted.

In this embodiment, the counting sensor 4 is a magnetic counting sensor, and a magnetic component (not shown) corresponding to the counting sensor 4 is embedded on the rotating shaft 14, and the magnetic component is a magnetic particle embedded on the surface of the rotating shaft 14 in this embodiment. The revolution detection with high efficiency and less error is realized through the effect of cutting the magnetic induction lines, and the influence possibly caused by turbid and constantly stirred oil is reduced.

In this embodiment, the housing 7 includes an outwardly extending connecting portion 71 in the form of an annular flange, and the connecting portion 71 is used for connecting the external pipe 8. The improved installation of the casing 7 and the motor 1 in the casing in the existing transformer substation is provided through the connecting part 71, namely, the pipeline where the impeller 6 and the impeller 6 are located does not need to be replaced, the casing 7 is only required to be installed in the pipeline through the connecting part 71, namely, the axial-flow pump structure is presented (namely, the connection with the inner wall of the external pipeline 8 is realized through the flanging structure of the connecting part 71, the external pipeline 8 corresponding to different diameters is realized, the connecting part 71 with different diameters can be installed in a welding mode and the like to realize adaptation, an opening for oil liquid to pass through is formed in the connecting part 71), the improvement cost is reduced, meanwhile, the target realization of prolonging the service life of an oil pump is ensured, the parameter indexes of the oil liquid pumped by the impeller 6 are not influenced, and the rotating speed switching is convenient and further controlled.

In this embodiment, intelligent oil pump is applied to the transformer and forces in the oil circulative cooling system for drive fluid circulation flows, and fluid carries out the heat exchange in the cooler, realizes the cooling purpose.

Referring to fig. 2, 3 and 4, the control principle of the intelligent oil pump in the forced oil circulation cooling system of the transformer will be described.

In the low-speed operation mode:

the QS is closed, the button SB2 is closed, the SB2 break contact is opened, the high-speed control circuit 111 is opened, mechanical interlocking is realized, the KM1 coil is electrified, the KM1 break auxiliary contact is opened, the high-speed operation circuit is opened, interlocking is realized, the KM1 break auxiliary contact is closed, self-locking is realized, the KM1 break main contact is closed, the circuit components are in triangular connection (the low-speed control circuit 112 is connected with the low-speed winding group 132 to work), the low-speed winding group 132 is three contacts of 6W, 6V and 6U in the figure 4, and the rotating shaft 14 drives the impeller 6 to operate at a low speed.

In the high-speed operation mode:

the button SB3 is closed, the SB3 break contact is opened, the low-speed control circuit 112 is opened, interlocking is realized, the SB3 make contact is closed, the KM2 and KM3 coils are electrified, the KM2 and KM3 break auxiliary contacts, the low-speed operation circuit is opened, interlocking is realized, the KM2 and KM3 make auxiliary contacts closed, self-locking is realized, the KM2 and KM3 make main contacts closed, the circuit components are in double-Y connection (the high-speed control circuit 111 is connected with the high-speed winding group 131 to work), the high-speed winding group 131 is connected with three contacts of 4W, 4V and 4U in the graph 4, and the rotating shaft 14 drives the impeller 6 to operate at a high speed.

When the work is stopped in a controlled way:

button SB1 is pressed to turn off the power supply to circuit assembly 11 and stop the operation.

The sensor control mode is as follows:

the vibration sensor 32, the counting sensor 4 and the temperature sensor 5 are connected to SB1, when one of them reaches and exceeds a safe value (the safe value is the vibration frequency/amplitude, the number of running turns and the temperature value of the normal running of the intelligent oil pump), SB1 is closed, and the motor 1 stops working.

The temperature sensor 5 is also connected to SB2 and SB3, when the temperature detected by the temperature sensor 5 is lower than the set value, SB2 is closed, and the whole operation state is the low-speed operation mode; when the temperature is higher than the set value, SB3 is closed, and the whole operation state is a high-speed operation mode.

It should be noted that the intelligent oil pump of the present application is developed according to the requirement of the transformer cooling system, but it is not limited to be used in the transformer, and it can also be applied to other occasions where the oil pump needs to be used to deliver oil.

The above-mentioned embodiments are merely descriptions of preferred embodiments of the present disclosure, and do not limit the concept and scope of the present disclosure. Various modifications and improvements of the technical solutions of the present application should fall into the protection scope of the present patent by those skilled in the art without departing from the design concept of the technical solutions of the present application, and the technical contents of the present application, which are claimed, are all described in the claims.