阅读说明：本技术 一种真空注液装置及真空注液方法 (Vacuum liquid injection device and vacuum liquid injection method ) 是由 尹朋博 许佐明 胡伟 谢雄杰 罗晓庆 万保权 于 2020-04-24 设计创作，主要内容包括：本发明提供了一种真空注液装置及真空注液方法,该装置包括：三通接头、抽真空组件和注液组件；其中,三通接头的第一端口设有注液口,用以连接待真空注液腔体；三通接头的第二端口与抽真空组件相连接；三通接头的第三端口与注液组件相连接；抽真空组件还与注液组件相连接,用以对注液组件进行抽真空处理。本发明通过抽真空组件对注液组件进行抽真空,以减少注液组件内的液体内的气体量,亦减少注液的密封管道上的不凝气体；在注液前进行注液组件的抽真空处理降低注液组件内的压强,实现注液组件的注液量大的要求；抽真空组件还用以对待真空注液腔体和注液的密封管道进行抽真空,以有效地排尽密封管道中的不凝气体。(The invention provides a vacuum liquid injection device and a vacuum liquid injection method, wherein the device comprises: the device comprises a three-way joint, a vacuumizing assembly and a liquid injection assembly; the first port of the three-way joint is provided with a liquid injection port for connecting a cavity to be vacuum injected; the second port of the three-way joint is connected with the vacuumizing assembly; the third port of the three-way joint is connected with the liquid injection assembly; the vacuumizing assembly is also connected with the liquid injection assembly and used for vacuumizing the liquid injection assembly. The liquid injection assembly is vacuumized through the vacuumizing assembly, so that the amount of gas in liquid in the liquid injection assembly is reduced, and non-condensable gas on a sealed pipeline for liquid injection is also reduced; before liquid injection, the liquid injection assembly is vacuumized to reduce the pressure in the liquid injection assembly, so that the requirement of large liquid injection amount of the liquid injection assembly is met; the vacuumizing assembly is also used for vacuumizing the liquid injection cavity to be vacuumized and the liquid injection sealed pipeline so as to effectively exhaust non-condensable gas in the sealed pipeline.)

1. A vacuum priming device, characterized by comprising: the three-way joint (T1), the vacuumizing assembly (2) and the liquid injection assembly (3); wherein the content of the first and second substances,

a first port of the three-way joint (T1) is provided with a liquid injection port (1) for detachably connecting a cavity (4) to be vacuum injected;

a second port of the three-way joint (T1) is connected with the vacuumizing assembly (2) and is used for vacuumizing the liquid injection cavity (4) to be vacuumized;

a third port of the three-way joint (T1) is connected with the liquid injection assembly (3) and is used for injecting liquid into the liquid injection cavity (4) to be vacuumized;

the vacuumizing assembly (2) is further connected with the liquid injection assembly (3) and used for vacuumizing the liquid injection assembly (3) so as to reduce the gas content of liquid in the liquid injection assembly (3) and enable the liquid between the three-way joint (T1) and the liquid injection assembly (3) to flow back into the liquid injection assembly (3) under the action of pressure difference.

2. The vacuum priming device of claim 1, wherein the vacuum pumping assembly (2) comprises: a mechanical vacuum pump (21) and a molecular pump (22) which are connected in sequence; wherein the content of the first and second substances,

mechanical vacuum pump (21) with be provided with second four-way connection (T3) between molecular pump (22), the first port of second four-way connection (T3) with mechanical vacuum pump (21) are connected, the second port of second four-way connection (T3) with molecular pump (22) are connected, the third port of second four-way connection (T3) with annotate liquid subassembly (3) and be connected, the fourth port of second four-way connection (T3) with the first port of three-way connection (T1) is connected.

3. The vacuum priming device of claim 2,

the molecular pump (22) with be equipped with first four-way connection (T2) between the first port of three way connection (T1), the first port of first four-way connection (T2) with molecular pump (22) are connected, the second port of first four-way connection (T2) with the first port of three way connection (T1) is connected, the third port of first four-way connection (T2) with the fourth port of second four-way connection (T3) is connected.

4. The vacuum priming device of claim 3,

and a fourth port of the first four-way joint (T2) is connected with a vacuum gauge (23) for detecting the vacuum degree.

5. Vacuum priming device according to any of the claims 1 to 4, characterized in that the priming assembly (3) comprises: a liquid storage tank (31); wherein the content of the first and second substances,

the lateral wall of liquid storage pot (31) with the third port of three way connection (T1) is connected, and, the top of liquid storage pot (31) is connected with supercharging equipment (32), be used for to liquid storage pot (31) carry out the pressure boost, so that the liquid in liquid storage pot (31) flows to in waiting to vacuum annotates liquid cavity (4).

6. The vacuum priming device of claim 5,

and a flow meter (33) is arranged between the liquid storage tank (31) and the three-way joint (T1) and is used for metering flowing liquid.

7. The vacuum priming device of claim 6,

an eighth sealing valve (K8) is arranged between the liquid storage tank (31) and the flowmeter (33), and a sealing pipeline between the liquid storage tank (31) and the eighth sealing valve (K8) is arranged from the outer wall of the liquid storage tank (31) to the periphery of the liquid storage tank (31) in an inclined and downward mode.

8. The vacuum priming device of claim 5,

and the side wall of the liquid storage tank (31) is provided with a volume scale value (311) for calibrating the volume of the liquid.

9. A vacuum liquid injection method, characterized in that, the vacuum liquid injection device according to any one of claims 1 to 8 is used for vacuum liquid injection, comprising the following steps:

a pretreatment step, wherein a liquid injection assembly of the vacuum liquid injection device is vacuumized through a vacuumizing assembly of the vacuum liquid injection device so as to pretreat a liquid body to be injected in the liquid injection assembly and reduce the gas content of the liquid body to be injected;

a vacuumizing step, wherein after the liquid body to be injected is pretreated in the pretreatment step, a sealed pipeline of the vacuum liquid injection device and the liquid injection cavity to be vacuum are vacuumized through the vacuumizing assembly until the pressure value of the sealed pipeline is lower than a preset value;

a liquid injection step, after the vacuumizing step is carried out, injecting liquid into the liquid injection cavity to be vacuumized through the liquid injection assembly, so that the liquid flows into the liquid injection cavity to be vacuumized under the action of pressure difference until the liquid injection amount in the liquid injection cavity to be vacuumized reaches a preset volume;

and a liquid recovery step, namely after the liquid injection amount in the liquid injection cavity to be vacuumized reaches a preset volume, disconnecting the vacuum liquid injection device from the liquid injection cavity to be vacuumized, and vacuumizing the liquid injection assembly to ensure that the pressure of the liquid injection assembly is less than the external atmospheric pressure so as to enable the liquid in the sealed pipeline to flow back to the liquid injection assembly.

10. The vacuum priming method of claim 9, wherein the evacuating step comprises the substeps of:

a low vacuum treatment substep, wherein the sealed pipeline and the liquid injection cavity to be vacuumized are vacuumized by a mechanical vacuum pump of the vacuumizing assembly until the pressure value of the sealed pipeline is lower than the maximum inlet pressure of a molecular pump of the vacuumizing assembly;

and in the high vacuum treatment substep, after the pressure value of the sealed pipeline is lower than the maximum inlet pressure of the molecular pump of the vacuumizing assembly, vacuumizing the sealed pipeline and the liquid injection cavity to be vacuumized by the molecular pump of the vacuumizing assembly, and stopping vacuumizing treatment until the pressure value of the sealed pipeline is lower than a preset value.

Technical Field

The invention relates to the technical field of power equipment, in particular to a vacuum liquid injection device and a vacuum liquid injection method.

Background

The sleeve of the converter transformer is used as a core and key component of the converter transformer, is a necessary path for sending out electric energy, and the running state of the sleeve is directly related to the safe and stable running of a direct current transmission system. Once the fault occurs, the operation is light, the casing body is damaged, the casing is exploded, the transformer is burnt, large-area power failure is caused, and huge economic loss is caused.

In recent years, because faults caused by local overheating of an ultra/extra-high voltage converter transformer bushing frequently occur, in order to solve the heating problem, a structural form of double guide pipes (an inner current-carrying guide pipe and an outer rolled guide pipe) is generally adopted at home and abroad, the total heating value is reduced by increasing the section of the current-carrying guide pipe, or the heat diffusion is enhanced by filling circulated transformer oil between the inner guide pipe and the outer guide pipe. Researches prove that the temperature distribution of a current-carrying conductor of the high-voltage bushing can be effectively homogenized by combining the heat pipe technology with the high-voltage bushing, and the internal heat is quickly dissipated to the outside of equipment, so that the heat-carrying conductor is an effective technical means for solving the problem of bushing heat.

The heat pipe and high voltage bushing technology is still in the primary stage, and some key manufacturing equipment, such as high voltage bushing current-carrying conductor vacuum liquid injection equipment and the like, are still lacked in the production and manufacturing process. Because the super/extra-high voltage sleeve pipe is large in size and high in installation position in engineering, the liquid injection amount is large, the position of a liquid injection port is relatively high (generally more than 10 m), vacuum liquid injection equipment is generally positioned on the ground for convenient operation, and the vacuum liquid injection cannot be realized under the condition of high drop by the conventional vacuum liquid injection device. In addition, the sleeve is in a key position, and has extremely high requirement on the long-term operation stability, so that the content of non-condensable gas in the heat pipe is required to be strict, namely the initial vacuum degree before liquid injection is required to be lower than 10^-3P, which causes that a plurality of vacuum liquid injection modes can not meet the requirements.

Disclosure of Invention

In view of the above, the invention provides a vacuum liquid injection device and a vacuum liquid injection method, and aims to solve the problems that liquid injection cannot be performed under a high drop condition and the requirement on the vacuum degree before casing liquid injection cannot be met in the conventional vacuum liquid injection method.

In one aspect, the present invention provides a vacuum liquid injection device, including: the device comprises a three-way joint, a vacuumizing assembly and a liquid injection assembly; the first port of the three-way joint is provided with a liquid injection port for detachably connecting a cavity to be vacuumized; the second port of the three-way joint is connected with the vacuumizing assembly and used for vacuumizing the liquid injection cavity to be vacuumized; the third port of the three-way joint is connected with the liquid injection assembly and is used for injecting liquid into the liquid injection cavity to be vacuumized; the vacuumizing assembly is further connected with the liquid injection assembly and used for vacuumizing the liquid injection assembly so as to reduce the gas content of liquid in the liquid injection assembly, and liquid between the three-way connector and the liquid injection assembly flows back to the liquid injection assembly under the action of pressure difference.

Further, above-mentioned vacuum priming device, the evacuation subassembly includes: a mechanical vacuum pump and a molecular pump which are connected in sequence; the liquid injection device comprises a mechanical vacuum pump, a molecular pump, a liquid injection assembly, a mechanical vacuum pump, a first four-way joint, a second four-way joint, a third four-way joint and a fourth four-way joint, wherein the second four-way joint is arranged between the mechanical vacuum pump and the molecular pump, a first port of the second four-way joint is connected with the mechanical vacuum pump, a second port of the second four-way joint is connected with the molecular pump, a third port of the second four-way joint is connected with the liquid injection assembly, and a fourth port of the second four.

Further, according to the vacuum liquid injection device, a first four-way joint is arranged between the molecular pump and the first port of the three-way joint, the first port of the first four-way joint is connected with the molecular pump, the second port of the first four-way joint is connected with the first port of the three-way joint, and the third port of the first four-way joint is connected with the fourth port of the second four-way joint.

Further, in the vacuum liquid injection device, the fourth port of the first four-way joint is connected with a vacuum gauge for detecting the vacuum degree.

Further, above-mentioned vacuum priming device, annotate the liquid subassembly and include: a liquid storage tank; the side wall of the liquid storage tank is connected with the third port of the three-way joint, and a pressurizing device is connected above the liquid storage tank and used for pressurizing the liquid storage tank so as to enable liquid in the liquid storage tank to flow into the cavity to be vacuumized.

Further, in the vacuum liquid injection device, a flow meter is arranged between the liquid storage tank and the three-way joint and used for metering flowing liquid.

Further, according to the vacuum liquid injection device, an eighth sealing valve is arranged between the liquid storage tank and the flowmeter, and a sealing pipeline between the liquid storage tank and the eighth sealing valve is obliquely and downwards arranged from the outer wall of the liquid storage tank to the periphery of the liquid storage tank.

Furthermore, according to the vacuum liquid injection device, the side wall of the liquid storage tank is provided with a volume scale value for calibrating the volume of the liquid.

On the other hand, the invention also provides a vacuum liquid injection method, which adopts the vacuum liquid injection device to carry out vacuum liquid injection of the liquid injection cavity to be vacuumized and comprises the following steps: a pretreatment step, wherein a vacuumizing assembly of the vacuum liquid injection device is used for vacuumizing the liquid injection assembly so as to pretreat a liquid body to be injected in the liquid injection assembly and reduce the gas content of liquid in the liquid injection assembly; a vacuumizing step, wherein after the liquid body to be injected is pretreated in the pretreatment step, a sealed pipeline of the vacuum liquid injection device and the liquid injection cavity to be vacuum are vacuumized through the vacuumizing assembly until the pressure value of the sealed pipeline is lower than a preset value; a liquid injection step, after the vacuumizing step is carried out, injecting liquid into the liquid injection cavity to be vacuumized through the liquid injection assembly, so that the liquid flows into the liquid injection cavity to be vacuumized under the action of pressure difference until the liquid injection amount in the liquid injection cavity to be vacuumized reaches a preset volume; and a liquid recovery step, namely after the liquid injection amount in the liquid injection cavity to be vacuumized reaches a preset volume, disconnecting the vacuum liquid injection device from the liquid injection cavity to be vacuumized, and vacuumizing the liquid injection assembly to ensure that the pressure of the liquid injection assembly is less than the external atmospheric pressure so as to enable the liquid in the sealed pipeline to flow back to the liquid injection assembly.

Further, in the vacuum liquid injection method, the step of evacuating includes the substeps of: a low vacuum treatment substep, wherein the sealed pipeline and the liquid injection cavity to be vacuumized are vacuumized by a mechanical vacuum pump of the vacuumizing assembly until the pressure value of the sealed pipeline is lower than the maximum inlet pressure of a molecular pump of the vacuumizing assembly; and in the high vacuum treatment substep, after the pressure value of the sealed pipeline is lower than the maximum inlet pressure of the molecular pump of the vacuumizing assembly, vacuumizing the sealed pipeline and the liquid injection cavity to be vacuumized by the molecular pump of the vacuumizing assembly, and stopping vacuumizing treatment until the pressure value of the sealed pipeline is lower than a preset value.

According to the vacuum liquid injection device and the vacuum liquid injection method, the liquid injection assembly is vacuumized through the vacuumizing assembly, so that the amount of gas in liquid in the liquid injection assembly is reduced, the accuracy of liquid injected into a liquid injection cavity to be vacuumized is further ensured, and non-condensable gas on a sealed pipeline for liquid injection can be reduced; in addition, the pressurization treatment of the liquid injection assembly before liquid injection can effectively increase the pressure difference between the liquid to be injected and the liquid injection cavity to be vacuumized, and the requirement of high drop of the liquid injection assembly is met; the vacuumizing assembly is also used for vacuumizing the sealed pipeline for injecting liquid into the liquid cavity and liquid to be vacuumized so as to effectively exhaust non-condensable gas in the sealed pipeline and further ensure that the initial vacuum degree before liquid injection meets the requirement. Meanwhile, the vacuum liquid injection device is simple in structure, and the vacuum liquid injection method is convenient and easy to implement; in addition, the device can realize the recovery of liquid in the sealed pipeline due to the existence of the pressure difference between the liquid component and the liquid injection port after the liquid injection is finished, and is suitable for the production, the manufacture and the maintenance of various liquid injection cavities to be subjected to vacuum injection, particularly high-pressure sleeve current-carrying guide rods.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:

fig. 1 is a schematic structural diagram of a vacuum liquid injection device according to an embodiment of the present invention;

FIG. 2 is a block flow diagram of a vacuum injection method according to an embodiment of the present invention;

fig. 3 is a block flow diagram of a vacuum pumping step provided by an embodiment of the present invention.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

The embodiment of the device is as follows:

referring to fig. 1, a schematic structural diagram of a vacuum liquid injection device provided by an embodiment of the invention is shown. As shown in the figure, the vacuum liquid injection device comprises: the three-way joint T1, the vacuumizing assembly 2 and the liquid injection assembly 3; wherein the content of the first and second substances,

a first port of the three-way joint T1 is provided with a liquid injection port 1 for detachably connecting a cavity to be vacuum injected; a second port of the three-way joint T1 is connected with the vacuumizing assembly 2 and is used for vacuumizing the liquid injection cavity 4 to be vacuumized; a third port of the three-way joint T1 is connected with the liquid injection assembly 3 and is used for injecting liquid into the liquid injection cavity 4 to be vacuum; the vacuumizing assembly 2 is also connected with the liquid injection assembly 3 and used for vacuumizing the liquid injection assembly 3 so as to reduce the content of gas in the liquid injection assembly 3 and enable liquid between the three-way connector T1 and the liquid injection assembly 3 to flow back to the liquid injection assembly 3 under the action of pressure difference. Specifically, three ports of the three-way joint T1 are all arranged on a sealed pipeline and used for connecting the liquid injection port 1, the liquid injection assembly 3 and the vacuum pumping assembly 2; the vacuumizing assembly 2 and the liquid injection assembly 3 can also be connected through a sealing pipeline; preferably, the sealed conduit is a metal tube, a flexible tube or a metal bellows. In order to control the communication state between the liquid injection port 1 and the three-way joint T1, preferably, a first sealing valve K1 is disposed between the liquid injection port 1 and the three-way joint T1, that is, a first port of the first sealing valve K1 is connected to the liquid injection port 1, a second port is connected to the sealing pipeline, and the other end of the sealing pipeline is connected to a first port of the three-way joint T1, so that when the first sealing valve K1 is opened, the vacuum pumping treatment of the liquid injection cavity 4 to be vacuum is realized through the vacuum pumping assembly 2, and the liquid injection of the liquid injection cavity 4 to be vacuum is realized through the liquid injection assembly 3; and the communication between the liquid pouring port 1 and the three-way joint T1 can be cut off by the first sealing valve K1 after the completion of the liquid pouring.

With continued reference to fig. 1, the evacuation assembly 2 includes: a mechanical vacuum pump 21 and a molecular pump 22 connected in sequence; wherein the content of the first and second substances,

a second four-way joint T3 is arranged between the mechanical vacuum pump 21 and the molecular pump 22, a first port of the second four-way joint T3 is connected with the mechanical vacuum pump 21, a second port of the second four-way joint T3 is connected with the molecular pump 22, a third port of the second four-way joint T3 is connected with the liquid injection assembly 3, and a fourth port of the second four-way joint T3 is connected with a first port of the three-way joint T1. Specifically, the second four-way joint T3 is disposed at the outlet of the mechanical vacuum pump 21, so that the outlet of the mechanical vacuum pump 21 is connected to the liquid injection assembly 3, the three-way joint T1 and the molecular pump 22, respectively, so as to perform vacuum treatment on the liquid injection assembly 3, the communicated sealed pipeline and the liquid injection cavity 4 to be vacuum-treated through the mechanical vacuum pump 21 and the molecular pump 22. In order to facilitate control of the communication state between the mechanical vacuum pump 21 and the molecular pump 22, a fourth sealing valve K4 is provided between the second four-way joint T3 and the molecular pump 22 so as to block the communication therebetween, so that the mechanical vacuum pump 21 directly performs vacuum processing between the three-way joint T1 and between the three-way joint T1 and the liquid pouring port 1. In order to facilitate control of the communication state between the mechanical vacuum pump 21 and the three-way joint T1, a fifth sealing valve K5 is provided between the mechanical vacuum pump 21 and the three-way joint T1 so as to block the communication therebetween. In order to control the communication state between the mechanical vacuum pump 21 and the liquid injection assembly 3, a sixth sealing valve K6 is provided between the mechanical vacuum pump 21 and the liquid injection assembly 3 so as to block the communication between the two, so that the liquid injection assembly 3 injects liquid into the liquid injection port 1, and liquid is prevented from being injected into the mechanical vacuum pump 21 and/or the molecular pump 22.

In this embodiment, a first four-way joint T2 is provided between the molecular pump 22 and the first port of the three-way joint T1, the first port of the first four-way joint T2 is connected to the molecular pump 22, the second port of the first four-way joint T2 is connected to the first port of the three-way joint T1, and the third port of the first four-way joint T2 is connected to the fourth port of the second four-way joint T3. Specifically, the molecular pump 22 and the mechanical vacuum pump 21 may selectively cooperate to perform vacuum processing on the sealed pipeline and the liquid injection cavity 4 to be vacuum, so as to ensure that the vacuum degree or pressure value of the sealed pipeline and the liquid injection cavity can reach the preset requirement, thereby avoiding the occurrence of non-condensable gas in the sealed pipeline. A third sealing valve K3 is arranged between the first port of the first four-way joint T2 and the molecular pump 22 and is used for controlling the communication state between the first port of the first four-way joint T2 and the molecular pump 22; a second sealing valve K2 is disposed between the second port of the first four-way joint T2 and the first port of the three-way joint T1 to control the communication state between the second port of the first four-way joint T2 and the first port of the three-way joint T1. In order to facilitate the detection of the vacuum degree, the fourth port of the first four-way joint T2 is preferably connected with a vacuum gauge 23 for detecting the vacuum degree during the vacuum pumping process of the mechanical vacuum pump 21 and/or the molecular pump 22.

With continued reference to fig. 1, the priming assembly 3 includes: a reservoir 31; wherein the content of the first and second substances,

the side wall of the liquid storage tank 31 is connected with the third port of the three-way joint T1, and a pressurizing device 32 is connected above the liquid storage tank 31 for pressurizing the liquid storage tank 31, so that the liquid in the liquid storage tank 31 flows into the liquid injection cavity 4 to be vacuumized through the three-way joint T1 and the liquid injection port 1 respectively. Specifically, the liquid storage tank 31 is connected with a third port of the three-way joint T1 through a sealing pipeline; preferably, a liquid outlet hole is formed in the side wall of the liquid storage tank 31 and used for connecting a sealing pipeline; further preferably, the liquid outlet is higher than the bottom wall of the liquid storage tank 31 by a predetermined distance, which may be 5cm or other values, and this embodiment is not limited thereto. To facilitate the outflow of the liquid, it is preferable that the sealing pipe connected to the reservoir 31 is disposed obliquely downward from the outer wall of the reservoir 31 to the outer periphery of the reservoir 31 near the outlet section of the reservoir 31, i.e., for example, the sealing pipe between the eighth sealing valve and the reservoir 31 is disposed obliquely downward. The pressurization device 32 may be connected to the top wall of the reservoir 31 by a sealed conduit to achieve pressurization of the reservoir 31. And the third port of the second four-way joint T3 is connected to the top end of the liquid storage tank 31 through a sealing pipeline so as to vacuumize or depressurize the liquid storage tank 31. To facilitate the observation of the amount of liquid in the reservoir 31, it is preferable that the sidewall of the reservoir 31 is provided with a volume scale 311 for calibrating the volume of liquid.

In this embodiment, a flow meter 33 is provided between the reservoir 31 and the three-way joint T1 to meter the flow rate and the cumulative amount of the liquid between the reservoir 31 and the three-way joint T1. Specifically, the amount of liquid injected into the liquid injection cavity 4 to be vacuumed can be measured by the flow meter 33 so as to detect the amount of liquid injected into the liquid injection cavity 4 to be vacuumed. In order to facilitate the control of the communication state between the flow meter 33 and the reservoir 31, an eighth sealing valve K8 is provided between the flow meter 33 and the reservoir 31 so as to effectively control the communication therebetween; in order to facilitate the control of the communication state between the three-way joint T1 and the flowmeter 33, a seventh sealing valve K7 is arranged between the three-way joint T1 and the flowmeter 33 so as to effectively control the communication between the two; and when the eighth sealing valve K8, the seventh sealing valve K7 and the first sealing valve K1 are all in an open state, the liquid storage tank 31 can be used for filling liquid into a sealing pipeline between the liquid storage tank 31 and the liquid filling port 1 and/or filling liquid into the liquid filling cavity 4 to be vacuumized, which is connected with the liquid filling port 1.

In the above embodiments, the respective sealing valves and the respective components are connected by sealing pipes to achieve communication, so as to facilitate vacuum pumping and liquid filling operations, for example, between the second port of the three-way joint T1 and the second sealing valve K2, between the second sealing valve K2 and the second port of the first four-way joint T2, between the fourth port of the first four-way joint T2 and the vacuum gauge 23, between the first port of the first four-way joint T2 and the third sealing valve K3, between the third port of the first four-way joint T2 and the fifth sealing valve K5, between the fourth sealing valve K4 and the second four-way joint T3, between the fifth sealing valve K5 and the second four-way joint T3, between the fourth sealing valve K3 and the second four-way joint T3, between the sixth sealing valve K6 and the second four-way joint T3, and so on.

In summary, in the vacuum liquid injection device provided in this embodiment, the liquid injection assembly 3 is vacuumized by the vacuuming assembly 2, so as to reduce the amount of gas in the liquid injection assembly 3, thereby ensuring the accuracy of injecting the liquid into the liquid injection cavity 4 to be vacuumed, and simultaneously reducing the amount of non-condensable gas on the sealed pipeline for liquid injection; in addition, the vacuumizing treatment of the liquid injection assembly 3 is carried out before liquid injection, so that the pressure in the liquid injection assembly 3 can be effectively reduced, the pressure difference between the liquid injection assembly 3 and the liquid injection port 1 is large, and the requirement of large liquid injection amount of the liquid injection assembly is met; the vacuumizing assembly 2 is also used for vacuumizing the liquid injection cavity 4 to be vacuumized and the sealed pipeline for injecting liquid so as to effectively exhaust non-condensable gas in the sealed pipeline and further ensure that the initial vacuum degree before liquid injection meets the requirement. Meanwhile, the vacuum liquid injection device is simple in structure, and the vacuum liquid injection method is convenient and easy to implement; in addition, the device can realize the recovery of liquid in the sealed pipeline due to the existence of the pressure difference between the liquid component 3 and the liquid injection port 1 after the liquid injection is finished, and is suitable for the production, the manufacture and the maintenance of various liquid injection cavities to be vacuumized, in particular to a high-voltage bushing current-carrying guide rod.

The method comprises the following steps:

referring to fig. 2, it is a flow chart diagram of a vacuum liquid injection method provided in an embodiment of the present invention. As shown in the figure, the embodiment further provides a vacuum liquid injection method, and the method adopts the vacuum liquid injection device to perform vacuum liquid injection of the liquid injection cavity 4 to be vacuum-injected. The specific implementation process of the vacuum liquid injection device may be as described above, and this embodiment is not described herein again. The method comprises the following steps:

and step S1, connecting the liquid injection port of the vacuum liquid injection device with the liquid injection cavity to be vacuum liquid injected, and ensuring that the liquid injection cavity to be vacuum liquid injected is communicated with the vacuum liquid injection device and is well sealed.

Specifically, the liquid injection cavity 4 to be vacuum-injected can be connected to the liquid injection port 1, so that the liquid injection cavity 4 to be vacuum-injected is communicated with the vacuum liquid injection device, the sealing performance of the connecting position needs to be ensured during communication, and air leakage or liquid leakage of the connecting position is avoided. In this embodiment, the vacuum liquid injection cavity 4 is taken as a high-voltage bushing for example, the current-carrying conductor 41 of the high-voltage bushing needs to be connected to the liquid injection port 1 to communicate the high-voltage bushing with the vacuum liquid injection device.

And initializing step S2, and injecting a sufficient amount of liquid to be injected into the liquid injection assembly of the vacuum liquid injection device.

Specifically, all sealing valves of the vacuum liquid injection device may be first closed, that is, the first sealing valve K1, the second sealing valve K2, the third sealing valve K3, the fourth sealing valve K4, the fifth sealing valve K5, the sixth sealing valve K6, the seventh sealing valve K7, and the eighth sealing valve K8 are closed; then, the liquid is filled with a liquid to be injected in a sufficient amount into the liquid storage tank 31.

And a pretreatment step S3, wherein a vacuumizing assembly of the vacuum liquid injection device is used for vacuumizing the liquid injection assembly to realize pretreatment of the liquid to be injected so as to reduce the gas content of the liquid in the liquid injection assembly.

Specifically, after the step S1 and the initialization step S2 are connected, firstly, the mechanical vacuum pump 21 is started, and after the operation of the mechanical vacuum pump 21 is stable, the sixth sealing valve K6 is opened to perform a vacuum pumping treatment on the inside of the liquid storage tank 31 through the mechanical vacuum pump 21, so as to reduce the bubble content of the liquid to be injected, that is, reduce the gas content inside the liquid to be injected, complete the pretreatment of the liquid to be injected, and improve the accuracy of the amount of the liquid to be injected in the liquid injection pump 4 to be vacuumed; meanwhile, the non-condensable gas on a sealing pipeline of the vacuum liquid injection device can be avoided.

And a vacuumizing step S4, wherein after the liquid body to be injected is pretreated in the pretreatment step S3, the sealed pipeline and the liquid injection cavity of the vacuum liquid injection device are vacuumized by the vacuumizing assembly until the pressure value of the sealed pipeline is lower than a preset value.

Specifically, after the pretreatment of the liquid to be injected is performed in the pretreatment step S3, the vacuum inlet pressure and the pressure in the sealed pipeline may be detected in real time by the vacuum gauge 23, so as to know the pressure in the sealed pipeline during the vacuum pumping process; the vacuumizing assembly 2 is started to vacuumize the sealed pipeline of the vacuum liquid injection device and the liquid injection cavity 4 to be vacuumized through the vacuumizing assembly 2, the display value of the vacuum gauge 23 can be checked in real time in the vacuumizing process, and vacuumizing processing is stopped until the display value of the vacuum gauge 23 is lower than a preset value. Wherein the preset value can be determined according to actual conditions, and for a high voltage bushing, the preset value can be 10^-3Pa may be other values, but is not limited in this embodiment.

And a liquid injection step S5, wherein after the vacuumizing step S4 is carried out, the liquid injection cavity to be vacuumized is injected by the liquid injection assembly, so that the liquid flows into the liquid injection cavity to be vacuumized under the action of pressure difference until the liquid injection amount in the liquid injection cavity to be vacuumized reaches a preset volume.

Specifically, after the sealed pipeline of the vacuum liquid injection device and the liquid injection cavity 4 to be vacuum-pumped are vacuumized, firstly, the pressurization device 32 of the liquid injection assembly 3 can be started, and the eighth sealed valve K8 is opened, so as to increase the pressure in the liquid storage tank 31 and inject the liquid into the sealed pipeline; then, the first sealing valve K1 can be slowly opened to inject the liquid in the liquid storage tank 31 into the liquid injection cavity 4 to be vacuumized under the action of the pressure difference between the liquid storage tank 31 and the liquid injection cavity 4 to be vacuumized until the liquid injection amount in the liquid injection cavity 4 to be vacuumized reaches the preset volume V0, so as to realize the liquid injection of the liquid injection cavity 4 to be vacuumized; finally, the first sealing valve K1 is closed after the injection is completed. In the present embodiment, when the sealed pipeline is filled with the liquid, the flow meter 33 is cleared, and the volume V1 of the liquid in the liquid storage tank 31 is recorded by the volume scale value 311 of the liquid storage tank 31; when liquid is injected into the liquid injection cavity 4 to be vacuumized, the remaining volume in the liquid storage tank 31 is observed through the volume scale value 311 until the remaining volume reaches the reserved volume V2, or the accumulated volume of the flow meter 33 is observed until the accumulated volume reaches the preset volume V0, and then the first sealing valve K1 is closed to stop the injection of the liquid, so that the injection of the liquid can be completed; wherein, the reserve volume V2= V1-V0 of the liquid storage tank 31.

And a liquid recovery step S6, namely, after the liquid injection amount in the liquid injection cavity to be vacuumized reaches a preset volume, disconnecting the vacuum liquid injection device from the liquid injection cavity to be vacuumized, and vacuumizing the liquid injection assembly through the vacuumizing assembly so that the pressure of the liquid injection assembly is smaller than the external atmospheric pressure to reflux the liquid in the sealed pipeline into the liquid injection assembly.

Specifically, after the injection amount in the vacuum injection cavity 4 reaches the preset volume, first, the pressure boosting device 32 may be closed; then, the vacuum liquid injection device is disconnected with the cavity 4 to be vacuum injected, namely the high-voltage bushing current-carrying conductor 41 is disconnected with the liquid injection port 1; then, the sixth sealing valve K6 is opened, and the vacuumizing assembly 2 is used for vacuumizing and depressurizing the liquid storage tank 31 until the pressure in the liquid storage tank 31 is lower than the external atmospheric pressure; finally, the first sealing valve K1 is opened to make the liquid in the sealing pipeline flow back to the liquid storage tank 31, so as to complete the recovery of the liquid in the sealing pipeline.

Wherein, there is no precedence order between the connection step S1 and the initialization step S2.

Referring to fig. 3, it is a block flow diagram of the evacuation step provided in the embodiment of the present invention. As shown, the evacuation step S4 includes the following sub-steps:

and a low vacuum treatment substep S41, performing vacuum-pumping treatment on the sealed pipeline and the liquid injection cavity to be vacuum by using a mechanical vacuum pump of the vacuum-pumping assembly until the pressure value of the sealed pipeline is lower than the maximum inlet pressure of the molecular pump of the vacuum-pumping assembly.

Specifically, the mechanical vacuum pump 21 is kept on, the sixth sealing valve K6 is closed, the first sealing valve K1, the second sealing valve K2, the fifth sealing valve K5 and the seventh sealing valve K7 are opened to perform vacuum treatment on the sealed pipeline and the liquid injection cavity 4 to be vacuumized, and during the vacuumizing process, the display value of the vacuum gauge 23 is checked in real time until the display value of the vacuum gauge 23 is lower than the maximum inlet pressure of the molecular pump.

And a high vacuum processing substep S42, after the pressure value of the sealed pipeline is lower than the maximum inlet pressure of the molecular pump of the vacuumizing assembly, vacuumizing the sealed pipeline and the liquid injection cavity to be vacuumized by the molecular pump of the vacuumizing assembly, and stopping vacuumizing until the pressure value of the sealed pipeline is lower than a preset value.

Specifically, the mechanical vacuum pump 21 is kept on, the third sealing valve K3 and the fourth sealing valve K4 are opened and closed in sequence, the fifth sealing valve K5 is closed, and the molecular pump 22 is started, so that the mechanical vacuum pump 21 and the molecular pump 22 work simultaneously to perform vacuum pumping treatment; and in the process of vacuumizing, checking the display value of the vacuum gauge 23 in real time until the display pressure value of the vacuum gauge 23 is lower than a preset value, closing the first sealing valve K1, the second sealing valve K2, the third sealing valve K3 and the fourth sealing valve K4 in sequence, stopping the molecular pump 22, and finishing the vacuumizing.

Because the vacuum liquid injection device has the effects, the method for performing vacuum liquid injection by adopting the vacuum liquid injection device also has corresponding technical effects.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting the same, and although the present invention is described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that: modifications and equivalents may be made to the embodiments of the invention without departing from the spirit and scope of the invention, which is to be covered by the claims.