Vacuumizing device and transformer vacuum oiling equipment

Abstract

The utility model provides a vacuum pumping device and transformer vacuum oil injection equipment, the device comprises a vacuum pumping pipeline which comprises a main pipe section and at least one branch pipe section; for any branch pipe section, one end of the branch pipe section is communicated with the main pipe section, and the other end of the branch pipe section is used for being communicated with an inner cavity of an oil tank of the corresponding to-be-vacuumized transformer. The air inlet end of the first vacuumizing pump is communicated with the main pipe section; the speed-adjustable vacuum pumps are correspondingly arranged on the branch pipe sections, and the air inlet ends of the speed-adjustable vacuum pumps are communicated with the corresponding branch pipe sections; the first valves are correspondingly arranged at the ends, communicated with the main pipe section, of the branch pipe sections and used for controlling connection or disconnection between the main pipe section and the branch pipe sections. And the second valves are correspondingly arranged at the communicating parts of the branch pipe sections and the air inlet end of the speed-adjustable vacuum pump, and are used for controlling the connection or disconnection between the air inlet end of the speed-adjustable vacuum pump and the corresponding branch pipe sections. The problem of deformation of the oil tank can be avoided.

Description

Technical Field

[0001] The utility model embodiment relates to the technical field of transformer production, and in particular to a vacuum pumping device and transformer vacuum oil filling equipment. Background Art

[0002] During the transformer production process, the transformer product needs to be vacuum-oiled to have insulating electrical properties.

[0003] The ultimate vacuum degree of the oil tank cavity of a full vacuum transformer (the lowest vacuum degree without deformation of the oil tank) is often less than or equal to 133 Pa. For some special product models, the ultimate vacuum degree is even below 30 Pa. The ultimate vacuum degree of the oil tank cavity of a non-full vacuum transformer is often between 1000 and 50000 Pa.

[0004] The existing vacuum pumping equipment has a fast pumping speed and low pumping speed control accuracy.

[0005] The existing vacuum pumping equipment can be applied to the vacuum pumping operation of the full vacuum transformer, and can realize the rapid and large-volume vacuum pumping operation of the full vacuum transformer oil tank; and because the ultimate vacuum degree of the inner cavity of the oil tank of the full vacuum transformer is low, even if the vacuum speed control accuracy is low, it is not easy to cause the vacuum degree of the inner cavity of the oil tank to be lower than the ultimate vacuum degree, and the transformer oil tank is not easy to deform.

[0006] When the existing vacuum pumping equipment is used for the vacuum pumping operation of the oil tank of a non-full vacuum transformer, due to the fast vacuum speed, low vacuum speed control accuracy and high ultimate vacuum degree of the inner cavity of the oil tank of the non-full vacuum transformer, it is easy to cause the vacuum degree of the inner cavity of the oil tank to be lower than the ultimate vacuum degree, which can easily cause the transformer oil tank to deform. Utility Model Content

[0007] The embodiments of the utility model provide a vacuum pumping device and a transformer vacuum oil filling device to solve the problem that when the existing vacuum pumping equipment is used for the vacuum pumping operation of the oil tank of a non-full vacuum transformer, the vacuum degree of the inner cavity of the oil tank is easily lower than the limit vacuum degree due to the fast vacuum speed, low vacuum speed control accuracy and high limit vacuum degree of the inner cavity of the oil tank of the non-full vacuum transformer, which easily causes the transformer oil tank to deform.

[0008] In order to solve the above technical problems, the utility model is achieved as follows:

[0009] In a first aspect, an embodiment of the utility model provides a vacuum pumping device for a transformer oil tank, comprising:

[0010] The vacuum pipeline comprises: a main pipe section and at least one branch pipe section; for any branch pipe section, one end of the branch pipe section is connected to the main pipe section, and the other end is used to communicate with the inner cavity of the oil tank of the corresponding transformer to be vacuumed;

[0011] a first vacuum pump, wherein an air inlet end of the first vacuum pump is connected to the main pipe section;

[0012] An adjustable speed vacuum pump is correspondingly arranged at each branch pipe section, and an air inlet end of the adjustable speed vacuum pump is connected to the corresponding branch pipe section;

[0013] A first valve, correspondingly disposed at the end of each branch pipe section connected to the main pipe section, for controlling the connection or disconnection between the main pipe section and each branch pipe section;

[0014] The second valve is correspondingly arranged at the connecting portion connecting each branch pipe segment with the air inlet end of the adjustable speed vacuum pump, and is used to control the connection or disconnection between the air inlet end of the adjustable speed vacuum pump and the corresponding branch pipe segment.

[0015] Optionally, it also includes:

[0016] A transition tank is arranged correspondingly to each of the branch pipe sections;

[0017] In any of the branch pipe sections, the end of the branch pipe section used for communicating with the inner cavity of the oil tank is communicated with the outlet of the transition tank, and the inlet of the transition tank is communicated with the inner cavity of the oil tank.

[0018] Optionally, it also includes: a vacuum gauge and a first controller;

[0019] The vacuum gauge is correspondingly arranged at each of the transition tanks, and is used to measure the vacuum degree in the transition tank;

[0020] The first controller comprises:

[0021] A first control interface, used to receive vacuum degree information sent by the vacuum gauge and forward it to an interaction terminal associated with a user;

[0022] A second control interface, used to send an opening signal or a closing signal to the first valve;

[0023] A third control interface, used to send an opening signal or a closing signal to the second valve;

[0024] The fourth control interface is used to send a speed reduction signal or a speed increase signal to the adjustable speed vacuum pump.

[0025] Optionally, it also includes:

[0026] An oil return pipeline is connected to the oil discharge port at the bottom of each transition tank respectively;

[0027] A third valve, correspondingly arranged at each of the oil discharge ports, for controlling the connection or disconnection between the oil discharge port and the oil return pipeline;

[0028] The fourth valve is correspondingly arranged at the inlet of each transition tank, and is used for connecting or shutting off the inlet of the transition tank with the inner cavity of the oil tank.

[0029] Optionally, it further includes: a liquid level meter, an exhaust valve, and a second controller;

[0030] The liquid level meter is correspondingly arranged in each of the transition tanks, and is used to measure the liquid level value in the transition tank;

[0031] The exhaust valve is correspondingly arranged at each of the transition tanks, and is used to control the connection or disconnection between the inner cavity of the transition tank and the external space outside the transition tank;

[0032] The second controller comprises:

[0033] A fifth control interface, used to receive the liquid level value information sent by the liquid level meter and forward it to an interactive terminal associated with the user;

[0034] The sixth control interface is used to send an opening signal or a closing signal to the exhaust valve, to send an opening signal or a closing signal to the third valve, and to send an opening signal or a closing signal to the fourth valve.

[0035] Optionally, it also includes:

[0036] A fifth valve is provided at a connecting portion between the main pipe section and the air inlet end of the first vacuum pump, and is used to control the connection or disconnection between the air inlet end of the first vacuum pump and the main pipe section.

[0037] Optionally, the first vacuum pump comprises a rotary vane vacuum pump.

[0038] Optionally, the adjustable speed vacuum pump comprises a variable frequency scroll vacuum pump.

[0039] In a second aspect, an embodiment of the utility model provides a transformer vacuum oil filling device, comprising a vacuum extraction device for a transformer oil tank as described in any one of the first aspects.

[0040] In a third aspect, an embodiment of the present utility model provides a method for evacuating a transformer oil tank, based on the evacuation device for the transformer oil tank described in any one of the first aspects, the evacuation method comprising:

[0041] Controlling all the first valves to open, controlling all the second valves to close, and controlling the first vacuum pump to perform vacuum operation on all the inner cavities of the oil tank;

[0042] For any of the transformers to be vacuum-evacuated, when the vacuum degree of the inner cavity of the oil tank reaches a preset first vacuum degree threshold value corresponding to the oil tank of the transformer to be vacuum-evacuated, the first valve corresponding to the branch pipe section is controlled to be closed, the adjustable speed vacuum pump corresponding to the branch pipe section is turned on, and the second valve corresponding to the branch pipe section is opened, and the adjustable speed vacuum pump performs vacuum operation on the inner cavity of the oil tank; when the vacuum degree of the inner cavity of the oil tank reaches a preset second vacuum degree threshold value corresponding to the transformer to be vacuum-evacuated, the adjustable speed vacuum pump is controlled to maintain the vacuum degree of the inner cavity of the oil tank at the second vacuum degree threshold value for a maintenance time that reaches a preset maintenance time threshold; the second valve corresponding to the branch pipe section is controlled to be closed; wherein, the first vacuum degree threshold value M and the second vacuum degree threshold value N satisfy: M>N.

[0043] In an embodiment of the utility model, the vacuum pumping device includes: a vacuum pumping pipeline, a first vacuum pump, an adjustable speed vacuum pump, a first valve and a second valve. The vacuum pumping pipeline includes: a main pipe section and at least one branch pipe section; for any branch pipe section, one end of the branch pipe section is connected to the main pipe section, and the other end is used to communicate with the corresponding oil tank cavity of the transformer to be vacuumed; the air inlet end of the first vacuum pump is connected to the main pipe section; the adjustable speed vacuum pump is correspondingly arranged at each branch pipe section, and the air inlet end of the adjustable speed vacuum pump is connected to the corresponding branch pipe section; the first valve is correspondingly arranged at the end of each branch pipe section connected to the main pipe section, and is used to control the connection or disconnection between the main pipe section and each branch pipe section; the second valve is correspondingly arranged at each branch pipe section. The connecting part of the pipe section connected to the air inlet end of the adjustable speed vacuum pump is used to control the connection or disconnection between the air inlet end of the adjustable speed vacuum pump and the corresponding branch pipe section. In the embodiment of the utility model, the first vacuum pump can perform fast and large-volume vacuuming operations on the entire oil tank cavity, and the adjustable speed vacuum pump can perform vacuuming operations on the oil tank cavity at a precise vacuuming speed. The first vacuum pump is combined with the adjustable speed vacuum pump. Users can use the embodiment of the utility model to achieve fast and accurate vacuuming of the oil tank cavity of the vacuum transformer to be vacuumed, and effectively avoid the problem of oil tank deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] By reading the detailed description of the preferred embodiment below, various other advantages and benefits will become clear to those of ordinary skill in the art. The accompanying drawings are only used for the purpose of illustrating the preferred embodiment and are not considered to be limiting of the present invention. Moreover, the same reference symbols are used throughout the accompanying drawings to represent the same components. In the accompanying drawings:

[0045] Figure 1 This is a schematic diagram of the structure of the vacuum pumping device for the transformer oil tank according to an embodiment of the utility model;

[0046] Figure 2The figure is a flow chart of a method for vacuuming a transformer oil tank according to an embodiment of the utility model;

[0047] in:

[0048] 100. Vacuum transformer to be evacuated; 200. Inner cavity of oil tank; 300. Control cabinet;

[0049] 1. Vacuum pipe; 11. Main pipe section; 12. Branch pipe section;

[0050] 2. First vacuum pump; 3. Adjustable speed vacuum pump; 4. First valve; 5. Second valve;

[0051] 6. Transition tank; 61. Vacuum gauge; 62. Liquid level gauge; 63. Exhaust valve;

[0052] 7. Oil return pipeline; 8. Third valve; 9. Fourth valve; 10. Fifth valve. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0054] The terms "first", "second", etc. of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the terms used in this way are interchangeable where appropriate, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first" and "second" are generally of one type, and the number of objects is not limited, for example, the first object can be one or more. In addition, "or" in the present application represents at least one of the connected objects. For example, "A or B" covers three schemes, namely, Scheme 1: including A but not including B; Scheme 2: including B but not including A; Scheme 3: including both A and B. The character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0055] In the technical solution of the present disclosure, words such as “connect”, “couple” or “connected” are not limited to physical or mechanical connections, but may include electrical connections.

[0056] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0057] The utility model provides a vacuum pumping device for a transformer oil tank. Figure 1 As shown, the vacuum device comprises:

[0058] The vacuum pipeline 1 comprises: a main pipe section 11 and at least one branch pipe section 12; for any branch pipe section 12, one end of the branch pipe section 12 is connected to the main pipe section 11, and the other end is used to communicate with the oil tank inner cavity 200 of the corresponding transformer 100 to be vacuumed;

[0059] A first vacuum pump 2, wherein an air inlet end of the first vacuum pump 2 is connected to the main pipe section 11;

[0060] The adjustable speed vacuum pump 3 is correspondingly arranged at each branch pipe section 12, and the air inlet end of the adjustable speed vacuum pump 3 is connected with the corresponding branch pipe section 12;

[0061] The first valve 4 is correspondingly arranged at the end where each branch pipe section 12 is connected to the main pipe section 11, and is used to control the connection or disconnection between the main pipe section 11 and each branch pipe section 12;

[0062] The second valve 5 is correspondingly arranged at the connecting portion connecting each branch pipe section 12 with the air inlet end of the adjustable speed vacuum pump 3 , and is used to control the connection or disconnection between the air inlet end of the adjustable speed vacuum pump 3 and the corresponding branch pipe section 12 .

[0063] It should be noted that Figure 1 In the embodiment shown, the vacuuming pipeline 1 includes a main pipe section 11 and three branch pipe sections 12. In practical applications, the vacuuming pipeline 1 may include a main pipe section 11 and at least one branch pipe section 12, and the number of branch pipe sections 12 may be specifically set by the user according to the actual transformer production plan. For example, after the user's calculation, four transformers need to be vacuumed in each batch to achieve the transformer production plan, so the user sets the vacuuming device of the embodiment of the utility model to four branch pipe sections 12.

[0064] In some embodiments of the present invention, optionally, the adjustable speed vacuum pump 3 includes: a variable frequency vacuum pump.

[0065] A variable frequency vacuum pump is a vacuum pump that can control the pump's operating speed and pumping capacity by adjusting the power frequency or voltage. By changing the power frequency or voltage, the variable frequency vacuum pump can achieve an adjustable pumping speed, so that continuous operation with different vacuum settings can be achieved through logical control, thereby adapting to different process requirements or working conditions. This type of pump is usually energy-saving, efficient, and stable, and is suitable for applications that require flexible control of vacuum and pumping speed, such as vacuum drying, vacuum distillation, vacuum packaging, etc.

[0066] When it is necessary to evacuate the inner chamber 200 of the oil tank of the vacuum transformer 100, the user can control all the first valves 4 to open, control all the second valves 5 to close, and control the first vacuum pump 2 to evacuate the entire inner chamber 200 of the oil tank. The first vacuum pump 2 is used to perform a rapid and large-volume vacuum operation to rapidly reduce the air content in the inner chamber 200 of the oil tank until the vacuum degree in the inner chamber 200 of the oil tank reaches an intermediate vacuum degree. The intermediate vacuum degree is determined by the vacuum process and matches the oil tank of the vacuum transformer to be evacuated. Different oil tanks of vacuum transformers to be evacuated match different intermediate vacuum degrees. Specifically, before reaching the intermediate vacuum degree, the first vacuum pump 2 can be used to perform rapid and large-volume vacuuming operations on the entire oil tank cavity 200 to quickly reduce the air content in the oil tank cavity 200; when the intermediate vacuum degree is reached, the rapid and large-volume vacuuming operation performed by the first vacuum pump 2 should be terminated to avoid causing the vacuum of the oil tank cavity 200 to drop too quickly and exceed the target vacuum degree (the target vacuum degree, that is, the vacuum degree that meets production requirements and that the oil tank cavity 200 can tolerate (without deformation), the limit vacuum degree < target vacuum degree < intermediate vacuum degree), to avoid causing deformation and damage to the oil tank cavity 200.

[0067] Afterwards, for the oil tank inner cavity 200 that has reached the intermediate vacuum degree, the user controls the first valve 4 of the branch pipe section 12 corresponding to the oil tank inner cavity 200 to close, controls the second valve 5 of the branch pipe section 12 corresponding to the oil tank inner cavity 200 to open, and controls the adjustable speed vacuum pump 3 of the branch pipe section 12 corresponding to the oil tank inner cavity 200 to evacuate the oil tank inner cavity 200. The user can use the adjustable speed vacuum pump 3 to accurately control the pumping speed, so that the oil tank inner cavity 200 of the transformer to be evacuated can accurately reach the target vacuum degree.

[0068] Until the vacuum degree in the oil tank cavity 200 reaches the target vacuum degree, the vacuuming of the oil tank of the transformer to be vacuumed is completed. It should be noted that in some embodiments, after the vacuum degree in the oil tank cavity 200 reaches the target vacuum degree, according to process requirements, the adjustable speed vacuum pump 3 needs to be operated to maintain the target vacuum degree for a preset maintenance time; thereafter, it is determined that the vacuuming of the oil tank of the transformer to be vacuumed is completed.

[0069] It should be noted that, during the vacuuming process of the oil tank of the vacuum transformer to be evacuated using the embodiment of the utility model, the vacuum degree of the inner cavity 200 of the oil tank can be determined by the user through the reading of the vacuum gauge disposed in the inner cavity 200 of the oil tank.

[0070] In the embodiment of the utility model, the vacuum pumping device includes: a vacuum pumping pipeline 1, a first vacuum pump 2, an adjustable speed vacuum pump 3, a first valve 4 and a second valve 5. The vacuum pumping pipeline 1 includes: a main pipe section 11 and at least one branch pipe section 12; for any branch pipe section 12, one end of the branch pipe section 12 is connected to the main pipe section 11, and the other end is used to communicate with the corresponding oil tank cavity 200 of the transformer 100 to be vacuumed; the air inlet end of the first vacuum pump 2 is connected to the main pipe section 11; the adjustable speed vacuum pump 3 is correspondingly arranged at each branch pipe section 12, and the air inlet end of the adjustable speed vacuum pump 3 is connected to the corresponding branch pipe section 12; the first valve 4 is correspondingly arranged at the end of each branch pipe section 12 connected to the main pipe section 11, and is used to control the connection or disconnection between the main pipe section 11 and each branch pipe section 12; the second valve 5 The corresponding connecting parts connected to each branch pipe section 12 and the air inlet end of the adjustable speed vacuum pump 3 are used to control the connection or disconnection between the air inlet end of the adjustable speed vacuum pump 3 and the corresponding branch pipe section 12. In the embodiment of the utility model, the first vacuum pump 2 can perform fast and large-volume vacuuming operations on the entire oil tank cavity 200, and the adjustable speed vacuum pump 3 can perform vacuuming operations on the oil tank cavity 200 at a precise vacuuming speed. The first vacuum pump 2 is combined with the adjustable speed vacuum pump 3. Users can use the embodiment of the utility model to achieve fast and accurate vacuuming of the oil tank cavity 200 of the vacuum transformer to be vacuumed, and effectively avoid the problem of oil tank deformation.

[0071] In some embodiments of the present invention, the vacuum pumping device further comprises:

[0072] A transition tank 6 is provided corresponding to each branch pipe section 12;

[0073] In any branch pipe section 12 , the end of the branch pipe section 12 for communicating with the inner cavity 200 of the oil tank is communicated with the outlet of the transition tank 6 , and the inlet of the transition tank 6 is communicated with the inner cavity 200 of the oil tank.

[0074] In the embodiment of the utility model, the provision of the transition tank 6 can prevent part of the transformer oil in the oil tank inner cavity 200 from being sucked into the first vacuum pump 2 or the adjustable speed vacuum pump 3, thereby ensuring the safe and stable operation of the vacuum pump device in the embodiment of the utility model. It can be understood that, under the suction force of the first vacuum pump 2 or the adjustable speed vacuum pump 3, if part of the transformer oil is sucked out of the oil tank inner cavity 200, the part of the transformer oil enters the transition tank 6 and accumulates, and is not sucked into the first vacuum pump 2 or the adjustable speed vacuum pump 3 along the vacuum pipe 1.

[0075] In some embodiments of the utility model, optionally, the vacuum pumping device further includes: a vacuum gauge 61 and a first controller;

[0076] The vacuum gauge 61 is correspondingly arranged in each transition tank 6, and is used to measure the vacuum degree in the transition tank 6;

[0077] The first controller comprises:

[0078] A first control interface, used to receive vacuum degree information sent by the vacuum gauge 61 and forward it to an interaction terminal associated with the user;

[0079] A second control interface, used to send an opening signal or a closing signal to the first valve 4;

[0080] A third control interface, used to send an opening signal or a closing signal to the second valve 5;

[0081] The fourth control interface is used to send a speed reduction signal or a speed increase signal to the adjustable speed vacuum pump 3 .

[0082] In the embodiment of the utility model, the user can use the vacuum degree information obtained from the interactive end as the vacuum degree of the oil tank inner cavity 200, and then the user operates the second control interface to send an opening signal or a closing signal to the first valve 4, operates the third control interface to send an opening signal or a closing signal to the second valve 5, and operates the fourth control interface to send a speed reduction signal or a speed increase signal to the adjustable speed vacuum pump 3, so as to realize the vacuuming of the oil tank of the transformer to be vacuumed.

[0083] The first controller in the embodiment of the utility model is integrated into the control cabinet 300 .

[0084] When it is necessary to evacuate the inner chamber 200 of the oil tank of the vacuum transformer 100, the user operates the second control interface to send an opening signal to all the first valves 4, and operates the third control interface to send a closing signal to all the second valves 5, so that all the first valves 4 are opened and all the second valves 5 are closed. Further, the user operates the first vacuum pump 2 to start the vacuum pumping operation on the entire inner chamber 200 of the oil tank. As the vacuum pumping operation proceeds, the vacuum degree of the inner chamber 200 of the oil tank gradually decreases.

[0085] When the vacuum degree information obtained by the user through the interactive terminal indicates that the vacuum degree of the oil tank cavity 200 has reached the preset intermediate vacuum degree, for the oil tank cavity 200 that has reached the intermediate vacuum degree, the user operates the second control interface to send a closing signal to the first valve 4 of the branch pipe section 12 corresponding to the oil tank cavity 200, and operates the third control interface to send an opening signal to the second valve 5 of the branch pipe section 12 corresponding to the oil tank cavity 200, so that the first valve 4 of the branch pipe section 12 corresponding to the oil tank cavity 200 is closed and the second valve 5 is opened. Further, the user operates the adjustable speed vacuum pump 3 of the branch pipe section 12 corresponding to the oil tank cavity 200 to start, and the adjustable speed vacuum pump 3 performs a vacuum operation on the oil tank cavity 200 until the vacuum degree in the oil tank cavity 200 reaches the preset target vacuum degree. At this time, the vacuuming of the oil tank of the transformer to be vacuumed is completed.

[0086] In some embodiments of the present invention, optionally, the vacuum pumping device further comprises:

[0087] The oil return pipeline 7 is connected to the oil discharge port at the bottom of each transition tank 6 respectively;

[0088] The third valve 8 is correspondingly arranged at each oil discharge port, and is used to control the connection or disconnection between the oil discharge port and the oil return pipeline 7;

[0089] The fourth valve 9 is correspondingly arranged at the inlet of each transition tank 6 and is used for connecting or shutting off the inlet of the transition tank 6 with the inner cavity 200 of the oil tank.

[0090] In practical applications, the oil return pipeline 7 is used to discharge the transformer oil accumulated in the transition tank 6 to the oil return tank for centralized treatment.

[0091] When the transformer oil accumulated in the transition tank 6 needs to be discharged, the user can operate the first valve 4 and the second valve 5 to close and suspend the vacuuming operation of the oil tank inner cavity 200. Further, the user can operate the fourth valve 9 to close to prevent the transformer oil in the oil tank inner cavity 200 from continuously entering the transition tank 6 during the oil discharge process; the user further operates the third valve 8 to open so that the oil discharge port is connected with the oil return pipeline 7. Since the oil discharge port is located at the bottom of each transition tank 6, the transformer oil accumulated in the transition tank 6 gradually flows out from the oil discharge port into the oil return pipeline 7 under the action of its own gravity, thereby realizing the discharge of the transformer oil.

[0092] In some embodiments of the present utility model, optionally, the vacuum pumping device further includes: a liquid level meter 62, an exhaust valve 63, and a second controller;

[0093] The liquid level meter 62 is correspondingly arranged in each transition tank 6, and is used to measure the liquid level value in the transition tank 6;

[0094] The exhaust valve 63 is correspondingly arranged at each transition tank 6, and is used to control the connection or disconnection between the inner cavity of the transition tank 6 and the external space outside the transition tank 6;

[0095] The second controller comprises:

[0096] A fifth control interface, used to receive the liquid level value information sent by the liquid level meter 62 and forward it to the interaction terminal associated with the user;

[0097] The sixth control interface is used to send an opening signal or a closing signal to the exhaust valve 63 , to send an opening signal or a closing signal to the third valve 8 , and to send an opening signal or a closing signal to the fourth valve 9 .

[0098] It should be noted that, when transformer oil accumulates in the transition tank 6 , the liquid level value information sent by the liquid level meter 62 can roughly represent the amount of transformer oil accumulated in the transition tank 6 , and the user can determine whether the transformer oil accumulated in the transition tank 6 needs to be discharged based on the liquid level value information.

[0099] The second controller in the embodiment of the utility model is integrated into the control cabinet 300 .

[0100] When the user believes that the transformer oil accumulated in the transition tank 6 needs to be discharged according to the liquid level information obtained from the interactive terminal, the user can operate the first valve 4 and the second valve 5 to close and suspend the vacuum operation of the oil tank inner cavity 200. Further, the user operates the sixth control interface to send a closing signal to the fourth valve 9 to turn off the fourth valve 9 to prevent the transformer oil in the oil tank inner cavity 200 from continuously entering the transition tank 6 during the oil discharge process. Afterwards, the user can operate the sixth control interface to send an opening signal to the exhaust valve 63, the exhaust valve 63 is opened, the inner cavity of the transition tank 6 is connected to the external space outside the transition tank 6, and the vacuum pressure in the inner cavity of the transition tank 6 is released. The user further operates the sixth control interface to send an opening signal to the third valve 8 to open the third valve 8 so that the oil discharge port is connected to the oil return pipeline 7. Since the oil discharge port is located at the bottom of each transition tank 6, the transformer oil accumulated in the transition tank 6 gradually flows out from the oil discharge port into the oil return pipeline 7 under the action of its own gravity, thereby realizing the discharge of the transformer oil.

[0101] In some embodiments of the present invention, optionally, the vacuum pumping device further comprises:

[0102] The fifth valve 10 is disposed at the connecting portion between the main pipe section 11 and the air inlet end of the first vacuum pump 2 , and is used to control the connection or disconnection between the air inlet end of the first vacuum pump 2 and the main pipe section 11 .

[0103] In some embodiments of the present invention, optionally, the vacuum pumping device further comprises:

[0104] The third controller comprises:

[0105] The sixth control interface is used to send an opening signal or a closing signal to the fifth valve 10 .

[0106] The third controller in the embodiment of the utility model is integrated into the control cabinet 300 .

[0107] In some embodiments of the present invention, the first vacuum pump 2 may optionally include a rotary vane vacuum pump. The rotary vane vacuum pump has the characteristic of a high pumping rate, and its pumping rate can reach m 3 / h. The use of a rotary vane vacuum pump can quickly extract the air from the entire oil tank cavity.

[0108] In some embodiments of the present invention, optionally, the adjustable speed vacuum pump 3 includes a variable frequency scroll vacuum pump.

[0109] A scroll vacuum pump is a device used to generate vacuum, typically in industrial and scientific applications. This pump uses the rotation of turbine blades to generate centrifugal force, which draws gas or liquid into and out of the pump body. Scroll vacuum pumps are generally able to provide high vacuum and high pumping speeds, and are suitable for applications that require higher vacuum levels, such as semiconductor manufacturing, vacuum freeze drying, etc. They are generally more efficient and more stable than traditional rotary vane vacuum pumps.

[0110] The variable frequency scroll vacuum pump is a variable frequency vacuum pump developed on the basis of the scroll vacuum pump. It can control the extraction speed of the scroll vacuum pump by adjusting the motor speed of the scroll vacuum pump, thereby realizing precise control of the vacuum degree of the system. The variable frequency scroll vacuum pump has the advantages of fast extraction speed, good stability and low noise, and has gradually become one of the commonly used vacuum pumps in the industrial field.

[0111] In actual verification, the vacuum system composed of a vortex vacuum pump equipped with a variable frequency speed regulation device (equivalent to a variable frequency vortex vacuum pump) can achieve continuous adjustment of the vacuum pump speed and long-term stable operation at any speed, thereby ensuring that the vacuum degree of the vacuum system can be arbitrarily adjusted at a speed above 100 Pa and stable vacuum operation.

[0112] The embodiment of the utility model provides a transformer vacuum oil filling device, comprising a vacuum pumping device for a transformer oil tank as in any one of the embodiments of the utility model.

[0113] By using the transformer vacuum oil filling equipment of the embodiment of the utility model, it is possible to quickly and accurately evacuate the oil tank inner cavity 200 of the transformer to be vacuumed, effectively avoid the problem of oil tank deformation, and ensure the high quality of the transformer product after the vacuum oil filling process.

[0114] The utility model embodiment provides a method for evacuating a transformer oil tank, and a vacuum pumping device for a transformer oil tank according to any one of the utility model embodiments. Figure 2 As shown, the vacuuming methods include:

[0115] Step S1: controlling all first valves to open, controlling all second valves to close, and controlling the first vacuum pump to perform vacuum operation on the entire inner cavity of the oil tank;

[0116] Step S2: For any transformer to be vacuumed, when the vacuum degree of the inner cavity of the oil tank reaches a preset first vacuum degree threshold value corresponding to the oil tank of the transformer to be vacuumed, the first valve of the corresponding branch pipe section is controlled to be closed, the adjustable speed vacuum pump of the corresponding branch pipe section is turned on, and the second valve of the corresponding branch pipe section is opened, and the adjustable speed vacuum pump performs vacuum operation on the inner cavity of the oil tank; when the vacuum degree of the inner cavity of the oil tank reaches a preset second vacuum degree threshold value corresponding to the transformer to be vacuumed, the adjustable speed vacuum pump is controlled to maintain the vacuum degree of the inner cavity of the oil tank at the second vacuum degree threshold value for a maintenance time that reaches a preset maintenance time threshold; the second valve of the corresponding branch pipe section is controlled to be closed; wherein, the first vacuum degree threshold value M and the second vacuum degree threshold value N satisfy: M>N.

[0117] It should be noted that in the embodiment of the utility model, the vacuum degree of the inner cavity of the oil tank reaches the preset first vacuum degree threshold value corresponding to the oil tank of the transformer to be vacuumed, which can mean that the vacuum degree of the inner cavity of the oil tank is equal to the first vacuum degree threshold value. It can be understood that in the actual production process, it is difficult to ensure that the vacuum degree is equal to a certain fixed value. Therefore, when 90% of the first vacuum degree threshold value ≤ the vacuum degree of the inner cavity of the oil tank ≤ 110% of the first vacuum degree threshold value, it can be determined that the vacuum degree of the inner cavity of the oil tank is equal to the first vacuum degree threshold value.

[0118] It should be noted that, in the embodiment of the utility model, the vacuum degree of the inner cavity of the oil tank reaches the preset second vacuum degree threshold value corresponding to the transformer to be vacuumed, which may refer to the vacuum degree of the inner cavity of the oil tank being equal to the second vacuum degree threshold value. Correspondingly, in the step in which the maintenance time of the vacuum degree of the inner cavity of the oil tank being maintained at the second vacuum degree threshold value reaches the preset maintenance time threshold value, the maintenance time can specifically be the time when the vacuum degree of the inner cavity of the oil tank is maintained at the second vacuum degree threshold value.

[0119] Understandably, in actual production, it is difficult to ensure that the vacuum is equal to a certain value. Therefore, when 90% of the second vacuum threshold ≤ the vacuum of the inner cavity of the oil tank ≤ 110% of the second vacuum threshold, it can be determined that the vacuum of the inner cavity of the oil tank is equal to the second vacuum threshold.

[0120] It should also be noted that the maintenance time threshold is a process parameter of the transformer vacuuming operation. The maintenance time threshold corresponds to the transformer to be vacuumed, that is, it is specifically set according to the specifications of various transformers to be vacuumed.

[0121] In some embodiments of the utility model, optionally, for any transformer to be vacuumed, the corresponding first vacuum degree threshold is the intermediate vacuum degree of the transformer to be vacuumed, and the intermediate vacuum degree is determined by the vacuuming process and matches the oil tank of the transformer to be vacuumed. Different oil tanks of transformers to be vacuumed match different intermediate vacuum degrees. Specifically, before reaching the intermediate vacuum degree, the first vacuum pump 2 can be used to perform a rapid large-volume vacuuming operation on the entire oil tank cavity 200 to quickly reduce the air content in the oil tank cavity 200; when the intermediate vacuum degree is reached, the rapid large-volume vacuuming operation performed by the first vacuum pump 2 should be terminated to avoid causing the vacuum of the oil tank cavity 200 to drop too quickly and exceed the target vacuum degree, and to avoid causing the oil tank cavity 200 to be deformed and damaged.

[0122] In addition, for any transformer to be evacuated, the corresponding second vacuum degree threshold is the target vacuum degree of the transformer to be evacuated. Specifically, when the target vacuum degree is reached, the production requirements of the transformer to be evacuated are met and the oil tank cavity 200 of the transformer to be evacuated can be tolerated (no deformation occurs). Specifically in the embodiment of the utility model, the oil tank cavity 200 that reaches the intermediate vacuum degree can be vacuumed by using an adjustable speed vacuum pump 3. The user can use the adjustable speed vacuum pump 3 to accurately control the vacuum speed, so that the oil tank cavity 200 of the transformer to be evacuated can accurately reach the target vacuum degree.

[0123] In the embodiment of the utility model, through steps S1 and S2, the inner cavity 200 of the oil tank of the transformer to be vacuumed can be quickly and accurately vacuumed, and the problem of oil tank deformation can be effectively avoided.

[0124] In actual production practice, for transformers with voltage levels of ≤35kV and / or capacities of 10000kVA and below, the inner cavity of the oil tank is almost always not completely vacuumed; and the ability of the above transformers to withstand vacuum varies greatly due to different product structures. Therefore, the intermediate vacuum degree and the target vacuum degree correspond to the specific transformer to be vacuumed, which is conducive to ensuring the safe and stable vacuuming operation.

[0125] In practical applications, the execution of steps S1 to S2 can be set and displayed and controlled in real time through the control system, and it also has data storage and transmission functions to meet the needs of digital production. In order to achieve the smooth operation of the above process, a set of effective technical methods for mutual identification of vacuum degree and speed need to be formed through special verification in combination with the product structure. It is mainly manifested in the following aspects:

[0126] A1. Establishment of vacuum degree and speed curve: Use adjustable speed vacuum equipment (equivalent to adjustable speed vacuum pump) to compare and verify the low, medium and high speeds and corresponding limit vacuum degrees of the non-full vacuum tank and form a continuous curve.

[0127] A2. Establishment of control program: Combined with the above speed and vacuum curve, the control system is compiled and set, and finally the equipment can adjust from low speed to high speed by itself after the vacuum degree is set, and the speed of the vacuum equipment is automatically adjusted through the feedback system when the set vacuum degree is reached, so that the final vacuum degree is stable within the set value range. Finally, the vacuum needs of various transformers are met.

[0128] A3. Establishment of control system: A control system is established under the above conditions. Through the vacuum degree set in advance by the control system (i.e. the preset first vacuum degree threshold and the second vacuum degree threshold), the vacuum degree of the vacuum equipment can be ensured to be maintained at the set vacuum degree after the equipment is turned on, thereby achieving the established transformer evacuation needs.

[0129] In some embodiments of the utility model, optionally, the vacuum pumping device further includes: a transition tank, which is correspondingly arranged at each branch pipe segment; in any branch pipe segment, the end of the branch pipe segment used for connecting to the inner cavity of the oil tank is connected to the outlet of the transition tank, and the inlet of the transition tank is connected to the inner cavity of the oil tank. The vacuum pumping device further includes: a vacuum gauge and a first controller; the vacuum gauge is correspondingly arranged at each transition tank, and is used to measure the vacuum degree in the transition tank; the first controller includes: a first control interface, which is used to receive the vacuum degree information sent by the vacuum gauge and forward it to an interactive terminal associated with the user; a second control interface, which is used to send an opening signal or a closing signal to the first valve; a third control interface, which is used to send an opening signal or a closing signal to the second valve; a fourth control interface, which is used to send a speed reduction signal or a speed increase signal to the adjustable speed vacuum pump;

[0130] The vacuuming method includes: taking the vacuum degree measured by the vacuum gauge as the vacuum degree of the inner cavity of the oil tank.

[0131] Combination Figure 1 The vacuum pumping device shown needs to vacuum the inner chamber 200 of the oil tank of the vacuum transformer 100. The user operates the second control interface to send an opening signal to all the first valves 4, and the user operates the third control interface to send a closing signal to all the second valves 5, so that all the first valves 4 are opened and all the second valves 5 are closed. Further, the first vacuum pump 2 is operated to start the vacuum pumping operation on the entire inner chamber 200 of the oil tank. As the vacuum pumping operation proceeds, the vacuum degree of the inner chamber 200 of the oil tank gradually decreases.

[0132] When the vacuum information obtained by the user through the interactive terminal indicates that the vacuum degree of the oil tank cavity 200 has reached a preset intermediate vacuum degree (i.e., the first vacuum degree threshold), for the oil tank cavity 200 that has reached the intermediate vacuum degree, the user operates the second control interface to send a closing signal to the first valve 4 of the branch pipe segment 12 corresponding to the oil tank cavity 200, and operates the third control interface to send an opening signal to the second valve 5 of the branch pipe segment 12 corresponding to the oil tank cavity 200, so that the first valve 4 of the branch pipe segment 12 corresponding to the oil tank cavity 200 is closed and the second valve 5 is opened. Further, the user starts up the adjustable speed vacuum pump 3 of the branch pipe section 12 corresponding to the inner cavity 200 of the oil tank, and the adjustable speed vacuum pump 3 performs a vacuum operation on the inner cavity 200 of the oil tank until the vacuum degree in the inner cavity 200 of the oil tank reaches a preset target vacuum degree (i.e., the second vacuum degree threshold value); the fourth control interface is used to send a speed increase signal or a speed decrease signal to control the pumping speed of the adjustable speed vacuum pump 3, so that the vacuum degree of the inner cavity 200 of the oil tank is maintained at the target vacuum degree for a maintenance time that reaches a preset maintenance time threshold; the second valve 5 of the corresponding branch pipe section 12 is controlled to be closed; at this time, the vacuum pumping of the oil tank of the vacuum transformer 100 to be evacuated is completed.

[0133] In the embodiment of the utility model, the user can use the characteristic of the adjustable speed vacuum pump 3 to accurately control the pumping speed, and combine it with the signal feedback of the vacuum gauge to achieve the target vacuum degree in the oil tank cavity 200 of the transformer to be evacuated.

[0134] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, all of which are within the protection of the utility model.

Claims

1. A vacuum pumping device for a transformer oil tank, characterized in that: include: The vacuum pipeline comprises: a main pipe section and at least one branch pipe section; for any branch pipe section, one end of the branch pipe section is connected to the main pipe section, and the other end is used to communicate with the inner cavity of the oil tank of the corresponding transformer to be vacuumed; a first vacuum pump, wherein an air inlet end of the first vacuum pump is connected to the main pipe section; An adjustable speed vacuum pump is correspondingly arranged at each branch pipe section, and an air inlet end of the adjustable speed vacuum pump is connected to the corresponding branch pipe section; A first valve, correspondingly disposed at the end of each branch pipe section connected to the main pipe section, for controlling the connection or disconnection between the main pipe section and each branch pipe section; The second valve is correspondingly arranged at the connecting portion connecting each branch pipe segment with the air inlet end of the adjustable speed vacuum pump, and is used to control the connection or disconnection between the air inlet end of the adjustable speed vacuum pump and the corresponding branch pipe segment.

2. The vacuum pumping device for transformer oil tank according to claim 1, characterized in that: Also includes: A transition tank is arranged correspondingly to each of the branch pipe sections; In any of the branch pipe sections, the end of the branch pipe section used for communicating with the inner cavity of the oil tank is communicated with the outlet of the transition tank, and the inlet of the transition tank is communicated with the inner cavity of the oil tank.

3. The vacuum pumping device for transformer oil tank according to claim 2, characterized in that: Also includes: Vacuum gauge and first controller; The vacuum gauge is correspondingly arranged at each of the transition tanks, and is used to measure the vacuum degree in the transition tank; The first controller comprises: A first control interface, used to receive vacuum degree information sent by the vacuum gauge and forward it to an interaction terminal associated with a user; A second control interface, used to send an opening signal or a closing signal to the first valve; A third control interface, used to send an opening signal or a closing signal to the second valve; The fourth control interface is used to send a speed reduction signal or a speed increase signal to the adjustable speed vacuum pump.

4. The vacuum pumping device for transformer oil tank according to claim 2, characterized in that: Also includes: An oil return pipeline is connected to the oil discharge port at the bottom of each transition tank respectively; A third valve, correspondingly arranged at each of the oil discharge ports, for controlling the connection or disconnection between the oil discharge port and the oil return pipeline; The fourth valve is correspondingly arranged at the inlet of each transition tank, and is used for connecting or shutting off the inlet of the transition tank with the inner cavity of the oil tank.

5. The vacuum pumping device for transformer oil tank according to claim 4, characterized in that: Also includes: Liquid level gauge, exhaust valve, and second controller; The liquid level meter is correspondingly arranged in each of the transition tanks, and is used to measure the liquid level value in the transition tank; The exhaust valve is correspondingly arranged at each of the transition tanks, and is used to control the connection or disconnection between the inner cavity of the transition tank and the external space outside the transition tank; The second controller comprises: A fifth control interface, used to receive the liquid level value information sent by the liquid level meter and forward it to an interactive terminal associated with the user; The sixth control interface is used to send an opening signal or a closing signal to the exhaust valve, to send an opening signal or a closing signal to the third valve, and to send an opening signal or a closing signal to the fourth valve.

6. The vacuum pumping device for transformer oil tank according to claim 1, characterized in that: Also includes: A fifth valve is provided at a connecting portion between the main pipe section and the air inlet end of the first vacuum pump, and is used to control the connection or disconnection between the air inlet end of the first vacuum pump and the main pipe section.

7. The vacuum pumping device for transformer oil tank according to claim 1, characterized in that: The first vacuum pump comprises a rotary vane vacuum pump.

8. The vacuum pumping device for transformer oil tank according to claim 1 or 7, characterized in that: The adjustable speed vacuum pump comprises a variable frequency scroll vacuum pump.

9. A transformer vacuum oil filling device, characterized in that: A vacuum extraction device for a transformer oil tank comprising any one of claims 1 to 8.

Images