CN116678985A - High-precision electronic pressure controller with purging protection and purging protection method thereof - Google Patents

Abstract

A high-precision electronic pressure controller with purge protection and a purge protection method thereof are provided, wherein the electronic pressure controller is provided with a protective shell for carrying out purge protection on a connecting part on a pipeline arranged between an air inlet and an air outlet of the electronic pressure controller, the protective shell comprises a supplementary air inlet and a supplementary air pressure relief outlet, and a protection cavity for filling protection gas is formed between the protective shell and the connecting part positioned on the inner side of the protective shell. Through setting up the protective housing in all sealed relevant places, the joint is installed to protective housing outside, lets in the protection cavity in the middle of electronic pressure controller main part especially each adapting unit and the protective housing through the joint with protection gas, is full of protection cavity, makes the department of revealing easily like this will not have influence gas entering, can effectively solve the problem because little revealing influence test analysis result to and then can effectively solve the gas tightness problem in the coupling connection process through using the seal at each junction.

Description

High-precision electronic pressure controller with purging protection and purging protection method thereof

Technical Field

The application relates to a pressure controller, in particular to a high-precision electronic pressure controller with purge protection and a purge protection method thereof.

Background

An electronic pressure controller (hereinafter also referred to as EPC) is a commonly used electronic gas path control component in a precision instrument, and is essentially a feedback fit of functions such as pressure, flow and linear velocity by adopting an electronic pressure sensor, a flow sensor and a proportional electromagnetic valve and controlling through a circuit.

The EPC which is one of the key components of the gas chromatograph is an important component of the modern gas chromatograph, the quality of the performance index directly influences the accuracy and precision of gas flow control, further influences the retention value and the repeatability of analysis results, and also determines the multimode operation capability of the gas chromatograph and the automation degree of the whole machine. The method is widely applied to the fields of gas chromatography, analysis equipment, material equipment, biological medicine, semiconductors and the like.

Currently, the electronic pressure controllers on the market are generally classified into a pressure reducing type (see fig. 1), a back pressure type (see fig. 2), an external pressure taking type (see fig. 3) and a process control type (see fig. 4) according to principles in which a pressure sensor 12 of an electromagnetic proportional valve 11 is combined with a control system 13. The electromagnetic proportional valve is a control pressure element, the pressure sensor is a measurement pressure element, and the two elements are combined into any one of the four modes through a connecting module, and are coupled by using a joint connection mode suitable for users. However, in the coupling process, the problem of poor air tightness can occur, which leads to micro leakage and affects the test analysis result.

Disclosure of Invention

In order to solve the problems, the application aims to provide a high-precision electronic pressure controller with purge protection and a purge protection method thereof, which can effectively solve the problem that the micro leakage influences the test analysis result and further can effectively solve the air tightness problem in the coupling and connecting process.

According to the application, a high-precision electronic pressure controller with purge protection is provided, a protection shell for purge protection of a connecting part arranged on a pipeline between an air inlet and an air outlet of the electronic pressure controller is provided, the protection shell comprises a supplementary air inlet and a supplementary air pressure relief outlet for supplementing protective gas, and a protection cavity for filling the protective gas is formed between the protection shell and the connecting part positioned on the inner side of the protection shell.

Preferably, the connection means is a pressure sensor and/or a solenoid proportional valve connected to the pipeline.

Preferably, the electromagnetic proportional valve and/or the pressure sensor are of a screw-mounted construction.

Preferably, the first connector and the second connector are respectively arranged at the supplementary gas inlet and the supplementary gas pressure relief outlet.

Preferably, the first and second connectors are integrally formed with or otherwise attached to the make-up gas inlet and make-up gas pressure relief outlet, respectively.

Preferably, a sealant is provided at the connection of the connection member and the pipeline.

Preferably, a sealing rubber strip is arranged at the joint of the protective shell and the electronic pressure controller main body.

Preferably, a sealing rubber strip is arranged at the joint of the protective shell and the pipeline.

According to the application, the purging protection method for the electronic pressure controller is further provided, and the purging protection method is used for the high-precision electronic pressure controller with purging protection.

According to the application, the protection cavity can be filled with the protection gas, so that the easy leakage part can not be affected by the gas, thereby effectively solving the problem that the analysis result of the test is affected by micro leakage, and further effectively solving the problem of air tightness in the coupling and connecting process by using seals at all the connecting parts.

Drawings

Fig. 1 to 4 schematically show an electronic pressure controller of the type currently on the market.

Fig. 5 schematically shows the structure of an electronic pressure controller according to an embodiment of the present application.

Detailed Description

Exemplary embodiments of the present application are described in detail below with reference to the attached drawings. The exemplary embodiments described below and illustrated in the drawings are intended to teach the principles of the present application to enable one skilled in the art to make and use the present application in a number of different environments and for a number of different applications. The scope of the application is therefore defined by the appended claims, and the exemplary embodiments are not intended, and should not be considered, as limiting the scope of the application. Moreover, for ease of description, the dimensions of the various features shown in the figures are not necessarily drawn to actual scale. Like elements are denoted by like or similar reference numerals throughout the drawings. Conventional structures or local constructions will be omitted when they may cause confusion or unaware of an understanding of the present disclosure.

According to an embodiment of the present application, there is provided a high-precision electronic pressure controller with purge protection, as shown in fig. 5, in which a protection case 1 is provided for an electronic pressure controller body, i.e., EPC body, for purge protection of a connection member provided on a pipe between an air inlet 2 and an air outlet 3. The connection means is particularly connected to the components of the pipeline which are prone to leakage, such as the pressure sensor 4 and the electromagnetic proportional valve 6.

The protective shell 1 is provided with a supplementary gas inlet 7 and a supplementary gas pressure relief outlet 8 for supplementing protective gas, each of the supplementary gas inlet 7 and the supplementary gas pressure relief outlet 8 is provided with a first joint 9 and a second joint 9' respectively corresponding to each other, and the connection part of the protective shell 1 and the EPC main body, such as a pipeline, is fixedly sealed by using a sealing rubber strip 10.

In this way, the protective gas is introduced into the protective chamber of the protective case 1 from the supplementary gas inlet 7 through the first joint 9 and fills up, thereby forming a protective layer for each of the connection members inside the protective chamber, and the internal leakage gas leaking from each of the connection members can be purged out of the supplementary gas pressure release outlet 8.

Fig. 5 shows the whole protective housing 1 for simultaneously covering and protecting the pressure sensor 4, the electromagnetic proportional valve 6, the control system 5 and other connecting components, but is not limited thereto, and corresponding protective housings may be provided for each or a part of the connecting components, respectively, to perform purge protection, respectively.

Alternatively, the electromagnetic proportional valve 6 and the pressure sensor 4 are both of a screw-mounted type structure, and this screw-mounted type can achieve a further improved sealing effect.

As described above, the joints are sealed with the sealant, one or more protective cases are provided at the places where all the seals are related, the joints between the protective cases and the EPC main body are fixedly sealed with the sealant, the joints are installed outside the protective cases, and the protective gas is introduced into the EPC main body, especially into the protective cavity between each connecting part and the protective case, so that the protective cavity is filled with the protective gas, and thus the easy leakage place will not be affected by the gas. Thus, the EPC uses the high-precision pressure sensor and the electromagnetic proportional valve, and can realize high-precision and high-resolution control by matching with a relatively optimized PID algorithm, and the control precision is 0.001psi.

In fig. 5, a first joint 9, a second joint 9' are schematically shown, which may be integrally formed with or otherwise attached to the make-up gas inlet 7 and the make-up gas relief outlet 8, respectively.

In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise. Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured" and the like should be construed broadly, as they may be fixed, removable, or integral, for example; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances. While the application has been described with reference to various specific embodiments, it should be understood that numerous changes could be made within the spirit and scope of the inventive concepts described. Accordingly, it is intended that the application not be limited to the described embodiments, but that it have the full scope defined by the language of the following claims.

Claims (9)

1. The utility model provides a take high accuracy electronic pressure controller of purge protection, its characterized in that is provided with and is used for carrying out purge protection's protective housing (1) to the connecting piece on the pipeline of locating between air inlet (2) and gas outlet (3) of this electronic pressure controller, this protective housing (1) are including supplementary gas entry (7) and supplementary gas pressure release export (8) that are used for supplementary shielding gas to be formed with the protection cavity that is used for full of shielding gas between protective housing (1) and the connecting piece that is located this protective housing (1) inboard.

2. The high-precision electronic pressure controller with purge protection according to claim 1, wherein the connecting component is a pressure sensor (4) and/or an electromagnetic proportional valve (6) connected to the pipeline.

3. The high-precision electronic pressure controller with purge protection according to claim 1, characterized in that the electromagnetic proportional valve (6) and/or the pressure sensor (4) are of a screw-mounted structure.

4. The high-precision electronic pressure controller with purge protection according to claim 1, wherein the make-up gas inlet (7) and the make-up gas pressure relief outlet (8) are provided with a first joint (9) and a second joint (9') respectively.

5. The purge protected high precision electronic pressure controller according to claim 4, characterized in that the first joint (9), the second joint (9') are integrally formed or otherwise attached to the make-up gas inlet (7) and the make-up gas pressure relief outlet (8), respectively.

6. The high-precision electronic pressure controller with purge protection according to claim 1, wherein a sealant is provided at the connection of the connection member and the pipeline.

7. The high-precision electronic pressure controller with purge protection according to claim 1, wherein a joint of the protective shell (1) and the electronic pressure controller main body is provided with a sealing rubber strip.

8. The high-precision electronic pressure controller with purge protection according to claim 7, wherein a sealing rubber strip is arranged at the joint of the protection shell (1) and the pipeline.

9. A purge protection method for an electronic pressure controller, characterized in that, for the high-precision electronic pressure controller with purge protection according to any one of claims 1 to 8, a protection layer for each connection part inside the protection cavity is formed by making a protection gas enter the protection cavity inside the protection shell (1) from the make-up gas inlet (7) and fill up, so as to purge the internal leakage gas leaking from each connection part out of the make-up gas pressure release outlet (8).