Device for blowing away liquid argon in sampling pipe of flowmeter

Abstract

The utility model relates to a device for blowing away liquid argon in a sampling pipe of a flowmeter, and belongs to the technical field of blowing-away devices. The device comprises a liquid drainage pipeline and a valve body, one end of the liquid drainage pipeline is used for being connected to a positive pressure sampling pipe of the flowmeter and communicated with an inner cavity of the positive pressure sampling pipe, and the other end of the liquid drainage pipeline is used for being communicated with external air; the valve body is located on the liquid discharging pipeline and used for controlling connection and disconnection of the liquid discharging pipeline so that the liquid discharging pipeline can be blocked when the flowmeter works normally, the liquid discharging pipeline can be opened when liquid argon enters the positive pressure sampling pipe, and the liquid argon in the positive pressure sampling pipe can be squeezed out of the liquid discharging pipeline. Liquid argon in the sampling tube of the flowmeter can be blown out by the aid of pressure of flowing argon in the argon tube, and influence of the liquid argon on detection results of the flowmeter is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of liquid argon purging devices, in particular to a device for purging liquid argon in a sampling pipe of a flowmeter. Background Technique

[0002] Argon rectification is an important process for extracting high-purity argon in the air separation industry, usually carried out in an air separation plant. The argon rectification process includes rectification in a crude argon column and rectification in a fine argon column. The argon gas after rectification in the crude argon column still contains a part of nitrogen gas. The fine argon column can further separate argon gas and nitrogen gas to obtain high-purity argon gas. Before the argon gas leaves the rectification equipment, it is necessary to measure its flow rate for production planning and logistics management, and at the same time, it is also convenient to monitor the purity and pressure of the argon gas to ensure product quality.

[0003] The orifice plate flowmeter has a simple structure and is durable, and is often used to detect the flow rate of argon gas discharged from the fine argon column. The orifice plate flowmeter has an orifice plate as a throttling device. The diameter of the orifice plate is smaller than the pipe diameter. When argon gas passes through the orifice plate, liquid nitrogen is generated due to the throttling effect. The liquid nitrogen easily enters the positive pressure sampling pipeline in the flowmeter, resulting in distortion of the positive pressure data and affecting the accuracy of the flow rate detection result. Content of the Utility Model

[0004] The utility model provides a device for purging liquid argon in a sampling pipe of a flowmeter to solve the technical problem that when the orifice plate flowmeter is used to detect the flow rate of argon gas in the prior art, the liquefied argon gas enters the positive pressure sampling pipeline, resulting in inaccurate flow rate detection results.

[0005] To solve the above problems, the device for purging liquid argon in a sampling pipe of a flowmeter provided by the utility model adopts the following technical scheme:

[0006] A device for purging liquid argon in a sampling pipe of a flowmeter includes:

[0007] A drain pipeline, one end of which is used to connect to the positive pressure sampling pipe of the flowmeter and is communicated with the inner cavity of the positive pressure sampling pipe, and the other end is used to communicate with the external air;

[0008] A valve body, which is located on the drain pipeline and is used to control the on-off of the drain pipeline, so as to block the drain pipeline when the flowmeter is working normally, and open the drain pipeline when liquid argon enters the positive pressure sampling pipe, so that the liquid argon in the positive pressure sampling pipe can be extruded by the drain pipeline.

[0009] The beneficial effects of the above technical solution are as follows: When liquid argon enters the positive pressure sampling pipe of the flowmeter, the valve body is opened to connect the liquid discharge pipeline with the external air. At this time, the argon gas in the argon gas pipeline to be detected enters the positive pressure sampling pipe, and the liquid argon in the positive pressure sampling pipe is blown into the external air through the positive pressure sampling pipe and the liquid discharge pipeline, realizing the purging of the liquid argon in the positive pressure sampling pipe and avoiding the influence of the liquid argon on the detection accuracy of the flowmeter.

[0010] Further, the liquid discharge pipeline is used for vertically connecting to the positive pressure sampling pipe of the flowmeter.

[0011] Further, the liquid discharge pipeline includes a first liquid discharge pipe section and a second liquid discharge pipe section. One end of the first liquid discharge pipe section is used for connecting to the positive pressure sampling pipe of the flowmeter, and the other end is connected to the valve body. One end of the second liquid discharge pipe section is connected to the valve body, and the other end is used for communicating with the external air.

[0012] Further, a tee joint is connected to one end of the first liquid discharge pipe, and the first liquid discharge pipe section is connected to the positive pressure sampling pipe of the flowmeter through the tee joint.

[0013] The beneficial effects of the above technical solution are as follows: The liquid discharge pipeline is connected to the positive pressure sampling pipe through a tee joint. Compared with the method of welding the liquid discharge pipeline to the positive pressure sampling pipe, it can avoid the deformation of the positive pressure sampling pipe caused by welding and avoid affecting the detection result.

[0014] Further, the tee joint is a right-angle tee joint, including a vertical pipe section and a horizontal pipe section that are interconnected. The horizontal pipe section is vertically connected to the middle of the vertical pipe section. One end of the horizontal pipe section facing away from the vertical pipe section is connected to the first liquid discharge pipe section, and the vertical pipe section is used for being installed in the middle of the positive pressure sampling pipe of the flowmeter.

[0015] Further, the valve body adopts an electromagnetic valve.

[0016] Further, a timing controller is further included. The timing controller is electrically connected to the valve body. The timing controller is used for controlling the opening and closing of the valve body, so that the valve body is opened within a set time period and closed within another set time period.

[0017] The beneficial effects of the above technical solution are as follows: Using the timing controller to control the opening and closing of the valve body can regularly purge the liquid argon in the positive pressure sampling pipe, avoid a large amount of liquid argon accumulating in the positive pressure sampling pipe, and make the detection result of the flowmeter more accurate. Description of the Drawings

[0018] By reading the following detailed description with reference to the accompanying drawings, the above and other objects, features, and advantages of the exemplary embodiments of the present utility model will become readily understandable. In the drawings, several embodiments of the present utility model are shown in an exemplary rather than restrictive manner, and the same or corresponding reference numerals represent the same or corresponding parts, wherein:

[0019] Figure 1 It is a control schematic diagram of a device for purging liquid argon in the sampling pipe of a flowmeter provided by the present utility model.

[0020] Description of reference numerals:

[0021] 1. Process argon pipeline; 2. Positive pressure sampling pipe; 201. Upper sampling pipe section; 202. Lower sampling pipe section; 3. Negative pressure sampling pipe; 4. Transmitter; 5. Three-way joint; 501. Vertical pipe section; 502. Horizontal pipe section; 6. Valve body; 7. First drain pipe section; 8. Second drain pipe section; 9. Timing controller; 10. Power supply. Specific embodiments

[0022] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Those skilled in the art should know that the embodiments described below are a part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative efforts fall within the protection scope of the present utility model.

[0023] The following is one of the embodiments of a device for purging liquid argon in the sampling pipe of a flowmeter provided by the present utility model:

[0024] As Figure 1 shown, a device for purging liquid argon in the sampling pipe of a flowmeter is used to be installed on an orifice flowmeter on the process argon pipeline 1. The orifice flowmeter has a positive pressure sampling pipe 2 and a negative pressure sampling pipe 3, and also has a transmitter 4 for displaying the detection result. A device for purging liquid argon in the sampling pipe of a flowmeter provided by the present utility model is specifically installed on the positive pressure sampling pipe 2. A device for purging liquid argon in the sampling pipe of a flowmeter provided by the present utility model includes a drain pipeline, a valve body 6, a three-way joint 5, a timing controller 9, and a power supply 10.

[0025] The drain pipeline includes a first drain pipe section 7 and a second drain pipe section 8 that are arranged in sequence from left to right and are coaxial. The left end of the first drain pipe section 7 is used to communicate with the positive pressure sampling pipe 2, and the right end of the second drain pipe section 8 is used to communicate with the external air. Both the first drain pipe section 7 and the second drain pipe section 8 are made of copper pipes.

[0026] The valve body 6 is connected between the first liquid discharge pipe section 7 and the second liquid discharge pipe section 8. The valve body 6 adopts an electromagnetic valve. When the valve body 6 is opened, the first liquid discharge pipe section 7 and the second liquid discharge pipe section 8 are connected and communicated, and the liquid discharge pipeline is in an open state. When the valve body 6 is closed, the first liquid discharge pipe section 7 and the second liquid discharge pipe section 8 are not connected and communicated, and the liquid discharge pipeline is in a blocked state.

[0027] The tee joint 5 adopts a right-angle tee joint. The tee joint 5 includes a vertical pipe section 501 and a horizontal pipe section 502. The vertical pipe section 501 is communicated with the horizontal pipe section 502. The horizontal pipe section 502 is vertically connected at the middle position of the vertical pipe section 501. The vertical pipe section 501 is used to be installed in the middle of the positive pressure sampling pipe 2. Specifically, the positive pressure sampling pipe 2 is disconnected from the middle and divided into an upper sampling pipe section 201 and a lower sampling pipe section 202. The upper and lower ends of the vertical pipe section 501 are respectively connected to the upper sampling pipe section 201 and the lower sampling pipe section 202, and the vertical pipe section 501 is communicated with the upper sampling pipe section 201 and the lower sampling pipe section 202. One end of the horizontal pipe section 502 facing away from the vertical pipe section 501 is connected to the left end of the above-mentioned first liquid discharge pipe section 7, so that the first liquid discharge pipe section 7 is communicated with the inner cavity of the positive pressure sampling pipe 2.

[0028] The timing controller 9 is electrically connected to the valve body 6. The timing controller 9 is used to control the on-off of the valve body 6. Through parameter setting, the timing controller 9 can make the valve body 6 open within a set time period to blow out the liquid nitrogen in the positive pressure sampling pipe 2, and close within another set time period so that the flowmeter can work normally to detect the argon gas flow in the process argon pipeline 1. The timing controller 9 belongs to the prior art and will not be described in detail here.

[0029] The power supply 10 is connected to the timing controller 9 and is used to supply power to the timing controller 9.

[0030] During the use of the present utility model, the timing controller 9 can control the valve body 6 to open within a set time and close within a set time. When the valve body 6 is closed, the flowmeter can normally detect the argon gas flow in the process argon pipeline 1 and monitor the flow data in real time. When the valve body 6 is opened, the first liquid discharge pipe section 7 and the second liquid discharge pipe section 8 are communicated with the external air. At this time, the inside of the process argon pipeline 1 is at positive pressure and the outside is at negative pressure. The argon gas in the process argon pipeline 1 enters the liquid discharge pipeline from the positive pressure sampling pipe 2, and the argon gas blows the liquid argon in the positive pressure sampling pipe 2 to the liquid discharge pipeline and finally discharges it to the external air, realizing the blowing out of the liquid argon in the positive pressure sampling pipe 2.

[0031] The present utility model can regularly blow out the liquid argon in the positive pressure sampling pipe 2, avoid the influence of the liquid argon on the detection of the flowmeter, and make the detection result more accurate.

[0032] In this embodiment, the first drain pipe section 7 is connected to the positive pressure sampling pipe 2 through a tee joint 5. In other embodiments, a threaded hole is provided on the pipe wall of the positive pressure sampling pipe 2, and an external thread is provided at the left end of the first drain pipe section 7. The first drain pipe section 7 is screwed onto the positive pressure sampling pipe 2 to achieve connection with the positive pressure sampling pipe 2.

[0033] In this embodiment, the drain pipeline includes a first drain pipe section 7 and a second drain pipe section 8. The valve body 6 is connected between the first drain pipe section 7 and the second drain pipe section 8. In other embodiments, the drain pipeline only includes the first drain pipe section 7, and the valve body 6 is connected to the right end of the first drain pipe section 7. The liquid argon blown into the first drain pipe section 7 is directly discharged into the external air by the valve body 6.

[0034] Based on the above description of this specification, those skilled in the art can also understand the following terms used, such as the terms indicating orientation or positional relationship, such as "upper", "lower", "front", "rear", "left", "right", "width", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationship shown in the drawings of this specification. It is only for the purpose of facilitating the description of the solution of the present invention and simplifying the description, rather than explicitly or implicitly indicating that the device or element involved must have the specific orientation, be constructed and operate in the specific orientation. Therefore, the above terms of orientation or positional relationship cannot be understood or interpreted as a limitation to the solution of the present invention.

[0035] In addition, in the description of this specification, the meaning of "a plurality of" is at least two, such as two, three or more, etc., unless otherwise specifically defined.

Claims

1. A device for blowing out liquid argon in a flow meter sampling tube, characterized in that: include: A liquid discharge pipeline, one end of which is used to be connected to the positive pressure sampling tube of the flow meter and communicated with the inner cavity of the positive pressure sampling tube, and the other end of which is used to communicate with the external air; The valve body is located on the discharge pipeline and is used to control the on-off of the discharge pipeline so as to block the discharge pipeline when the flow meter is working normally, and to open the discharge pipeline when liquid argon enters the positive pressure sampling tube so that the liquid argon in the positive pressure sampling tube can be squeezed out from the discharge pipeline.

2. A device for blowing out liquid argon in a flow meter sampling tube according to claim 1, characterized in that: The liquid discharge pipeline is used to be vertically connected to the positive pressure sampling tube of the flow meter.

3. A device for blowing out liquid argon in a flow meter sampling tube according to claim 2, characterized in that: The drainage pipeline includes a first drainage pipe section and a second drainage pipe section. One end of the first drainage pipe section is used to connect to the positive pressure sampling tube of the flow meter, and the other end is connected to the valve body. One end of the second drainage pipe section is connected to the valve body, and the other end is used to communicate with the external air.

4. A device for blowing out liquid argon in a flow meter sampling tube according to claim 3, characterized in that: One end of the first liquid discharge pipe is connected with a three-way joint, and the first liquid discharge pipe section is connected to the positive pressure sampling tube of the flow meter through the three-way joint.

5. A device for blowing out liquid argon in a flow meter sampling tube according to claim 4, characterized in that: The three-way joint is a right-angle three-way joint, including a vertical pipe section and a horizontal pipe section that are interconnected. The horizontal pipe section is vertically connected to the middle of the vertical pipe section. One end of the horizontal pipe section facing away from the vertical pipe section is connected to the first liquid discharge pipe section. The vertical pipe section is used to be installed in the middle of the positive pressure sampling tube of the flow meter.

6. A device for blowing out liquid argon in a flow meter sampling tube according to any one of claims 1 to 5, characterized in that: The valve body adopts a solenoid valve.

7. A device for blowing out liquid argon in a flow meter sampling tube according to claim 6, characterized in that: It also includes a timing controller, which is electrically connected to the valve body and is used to control the on and off of the valve body so that the valve body is opened within a set time period and closed within another set time period.

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