阅读说明：本技术 仪表分析器真空度的保持装置及方法 (Device and method for maintaining vacuum degree of instrument analyzer ) 是由 赵力 刘双明 魏薇 王树利 周瑞彬 张剑 张美杰 许新普 李鹏德 武奎 贾存德 于 2018-07-26 设计创作，主要内容包括：本发明提供一种仪表分析器真空度的保持装置及方法,该装置包括：压缩空气源、补偿气路、气动真空泵和仪表分析器；压缩空气源与气动真空泵连接,用于为气动真空泵提供动力；气动真空泵与仪表分析器连接,用于对仪表分析器进行抽真空操作；补偿气路位于压缩空气源和仪表分析器之间,用于将压缩空气源中的部分空气输入至仪表分析器内,以补偿仪表分析器内的真空度,补偿气路为流量可调的管路；仪表分析器用于盛放待分析液体。本发明实现了当压缩空气源的压力发生波动时,仪表分析器内的真空度依然可以保持稳定。(The invention provides a device and a method for maintaining vacuum degree of an instrument analyzer, wherein the device comprises: the system comprises a compressed air source, a compensation air circuit, a pneumatic vacuum pump and an instrument analyzer; the compressed air source is connected with the pneumatic vacuum pump and used for providing power for the pneumatic vacuum pump; the pneumatic vacuum pump is connected with the instrument analyzer and is used for vacuumizing the instrument analyzer; the compensation gas circuit is positioned between the compressed air source and the instrument analyzer and used for inputting part of air in the compressed air source into the instrument analyzer so as to compensate the vacuum degree in the instrument analyzer, and the compensation gas circuit is a pipeline with adjustable flow; the meter analyzer is used to hold a liquid to be analyzed. The invention realizes that the vacuum degree in the instrument analyzer can still be kept stable when the pressure of the compressed air source fluctuates.)

1. A device for maintaining vacuum level of an instrument analyzer, comprising: the system comprises a compressed air source, a compensation air circuit, a pneumatic vacuum pump and an instrument analyzer;

the compressed air source is connected with the pneumatic vacuum pump and used for providing power for the pneumatic vacuum pump;

the pneumatic vacuum pump is connected with the instrument analyzer and is used for vacuumizing the instrument analyzer;

the compensation gas circuit is positioned between the compressed air source and the instrument analyzer and used for inputting part of air in the compressed air source into the instrument analyzer so as to compensate the vacuum degree in the instrument analyzer, and the compensation gas circuit is a pipeline with adjustable flow;

the meter analyzer is used to hold a liquid to be analyzed.

2. The apparatus of claim 1, further comprising a first regulating valve on the compensating air path.

3. The apparatus of claim 1, further comprising a second regulating valve connected between the source of compressed air and the pneumatic vacuum pump for regulating the flow of air delivered by the source of compressed air into the pneumatic vacuum pump.

4. The apparatus of claim 1, further comprising a vacuum gauge for measuring a vacuum level in the meter analyzer.

5. The apparatus of any one of claims 1-4, wherein the compressed air source further comprises an air compressor.

6. A method for maintaining a vacuum degree of a meter analyzer, which is applied to the device for maintaining a vacuum degree of a meter analyzer according to any one of claims 1 to 5, the method comprising:

measuring the vacuum level in the instrument analyzer;

and adjusting the air flow in the compensation air path according to the vacuum degree in the instrument analyzer so as to keep the vacuum degree in the instrument analyzer within a preset range.

7. The method of claim 6, further comprising a first regulating valve on the make-up air circuit;

the adjusting of the air flow in the compensation air path according to the vacuum degree in the instrument analyzer comprises:

and adjusting the first opening angle of the first adjusting valve according to the vacuum degree in the instrument analyzer so as to adjust the air flow in the compensation air path.

8. The method of claim 7, further comprising a second regulator valve connected between a compressed air source and a pneumatic vacuum pump;

the method further comprises the following steps:

adjusting a second opening angle of the second regulating valve to regulate an air flow rate of the compressed air source into the pneumatic vacuum pump.

9. The method of claim 8, wherein a ratio between the first opening angle and the second opening angle is 1:50 to 120.

10. The method of claim 8, wherein the first opening angle is in a range of 1 ° to 20 °, and the second opening angle is in a range of 600 ° to 720 °.

Technical Field

The invention relates to the technical field of petroleum product analysis, in particular to a device and a method for maintaining the vacuum degree of an instrument analyzer.

Background

The liquid oil is a mixture, components with specific boiling points are volatilized by using a distillation method, the distillation temperature of the liquid oil can be reduced under a vacuum environment generally according to a reduced pressure distillation principle, and some online analytical instruments utilize the principle to carry out vacuum pumping treatment on an instrument analyzer so that the oil is analyzed under the vacuum environment of the instrument analyzer to realize low-temperature analysis, so that the coking and cracking of the oil are reduced.

Currently, a pneumatic vacuum pump is typically used to evacuate the meter analyzer. The pneumatic vacuum pump is driven by compressed air as power, the compressed air on the site of the device is used by a plurality of gas-using equipment in parallel, and mutual interference exists, so that the pressure of the compressed air is unstable, and the vacuum degree in the instrument analyzer can change along with the pressure fluctuation of the compressed air. In order to obtain a stable vacuum degree, a pressure stabilizing valve is usually adopted, the opening degree of an opening and closing piece in a valve body is controlled to regulate the flow rate of a medium, the pressure behind the valve is kept within a certain range, the outlet pressure is kept within a set range under the condition that the inlet pressure is continuously changed, and then the outlet pressure is input into a pneumatic vacuum pump to keep the vacuum degree in an instrument analyzer stable.

However, the prior art can only stabilize a small range of pressure fluctuation, and when the pressure fluctuation of the compressed air is large, the stability of the pressure fluctuation is reduced, so that the requirement of pressure stabilization vacuum in the instrument analyzer cannot be met.

Disclosure of Invention

The invention provides a device and a method for maintaining the vacuum degree of a meter analyzer, which are used for maintaining the stability of the vacuum degree in the meter analyzer when the pressure of a compressed air source fluctuates.

In one aspect, the present invention provides a device for maintaining vacuum degree of an instrument analyzer, comprising:

the system comprises a compressed air source, a compensation air circuit, a pneumatic vacuum pump and an instrument analyzer;

the compressed air source is connected with the pneumatic vacuum pump and used for providing power for the pneumatic vacuum pump;

the pneumatic vacuum pump is connected with the instrument analyzer and is used for vacuumizing the instrument analyzer;

the compensation gas circuit is positioned between the compressed air source and the instrument analyzer and used for inputting part of air in the compressed air source into the instrument analyzer so as to compensate the vacuum degree in the instrument analyzer, and the compensation gas circuit is a pipeline with adjustable flow;

the meter analyzer is used to hold a liquid to be analyzed.

In this scheme, provide power for pneumatic vacuum pump through compressed air source, carry out the evacuation operation to the instrument analyzer, then set up the compensation gas circuit between compressed air source and instrument analyzer for in importing the instrument analyzer with partial air in the compressed air source, with the vacuum in the compensation instrument analyzer, rationally solved when compressed air source's emergence change, lead to pneumatic vacuum pump's power to take place undulant, and make the unstable problem of vacuum in the instrument analyzer.

Optionally, the compensation air circuit further comprises a first regulating valve.

Optionally, the device for maintaining the vacuum degree of the instrument analyzer further comprises a second regulating valve, and the second regulating valve is connected between the compressed air source and the pneumatic vacuum pump and is used for regulating the air flow transmitted from the compressed air source to the pneumatic vacuum pump.

Optionally, the device for maintaining the vacuum degree of the instrument analyzer provided by the invention further comprises a vacuum meter, wherein the vacuum meter is used for measuring the vacuum degree in the instrument analyzer.

Optionally, the compressed air source further comprises an air compressor.

The invention provides a device for maintaining the vacuum degree of an instrument analyzer, which is connected with a pneumatic vacuum pump through a compressed air source to provide power for the pneumatic vacuum pump, the pneumatic vacuum pump is connected with the instrument analyzer to vacuumize the instrument analyzer, a compensation air path is positioned between the compressed air source and the instrument analyzer and is used for inputting part of air in the compressed air source into the instrument analyzer to compensate the vacuum degree in the instrument analyzer, and the compensation air path is a pipeline with adjustable flow, wherein the instrument analyzer is used for containing liquid to be analyzed. Because the compensation gas circuit is arranged, partial air can be correspondingly input into the instrument analyzer according to the pressure fluctuation of the compressed air source, so that the vacuum degree in the instrument analyzer is stabilized.

In another aspect, the present invention provides a method for maintaining a vacuum degree of a meter analyzer, which is applied to the device for maintaining a vacuum degree of a meter analyzer, and the method includes:

measuring the vacuum level in the instrument analyzer;

and adjusting the air flow in the compensation air path according to the vacuum degree in the instrument analyzer so as to keep the vacuum degree in the instrument analyzer within a preset range.

In the scheme, the vacuum degree in the instrument analyzer is measured firstly, then the air flow in the compensation air path is adjusted according to the vacuum degree in the instrument analyzer so as to keep the vacuum degree in the instrument analyzer within a preset range, and the fluctuation of the vacuum degree in the instrument analyzer caused when a compressed air source connected with a gas vacuum pump fluctuates is compensated so as to keep the vacuum degree in the instrument analyzer stable.

Optionally, the compensation air path further comprises a first regulating valve;

correspondingly, according to the vacuum degree in the instrument analyzer, the air flow in the compensation gas circuit is adjusted, and the method comprises the following steps:

and adjusting the first opening angle of the first adjusting valve according to the vacuum degree in the instrument analyzer so as to adjust the air flow in the compensation air path.

Optionally, the pneumatic vacuum pump further comprises a second regulating valve, and the second regulating valve is connected between the compressed air source and the pneumatic vacuum pump;

correspondingly, the method also comprises the following steps:

and adjusting a second opening angle of the second adjusting valve to adjust the air flow transmitted from the compressed air source to the pneumatic vacuum pump.

Optionally, the ratio between the first opening angle and the second opening angle is 1: 50-120.

Optionally, the first opening angle ranges from 1 ° to 20 °, and the second opening angle ranges from 600 ° to 720 °.

The method for maintaining the vacuum degree of the instrument analyzer comprises the steps of firstly measuring the vacuum degree in the instrument analyzer, then adjusting the air flow in a compensation air path through a first opening angle of a first adjusting valve according to the vacuum degree in the instrument analyzer, and in addition, adjusting the air flow transmitted to a pneumatic vacuum pump by a compressed air source through adjusting a second opening angle of a second adjusting valve so as to maintain the vacuum degree in the instrument analyzer within a preset range. Because the air flow in the compensation air circuit is adjusted according to the vacuum degree in the instrument analyzer, the vacuum degree in the instrument analyzer can be kept stable when a compressed air source for providing power for the pneumatic vacuum pump fluctuates.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a device for maintaining vacuum degree of an instrument analyzer according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of the pneumatic vacuum pump of FIG. 1;

FIG. 3 is a schematic structural diagram of a device for maintaining the vacuum degree of a gauge according to a second embodiment of the present invention;

FIG. 4 is another schematic structural diagram of a device for maintaining the vacuum degree of a gauge according to a second embodiment of the present invention;

fig. 5 is a schematic flow chart of a method for maintaining vacuum degree of an instrument analyzer according to an embodiment of the present invention.

Description of reference numerals:

1. compressed air source

2. Compensation gas circuit

3. Pneumatic vacuum pump

4. Instrument analyzer

5. First connecting line

6. Second connecting line

7. Exhaust port of pneumatic vacuum pump

8. First regulating valve

9. Second regulating valve

10. Vacuum meter

11. Air compressor

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.