Gas flowmeter convenient to install under pressure and electrolytic aluminum production line

Abstract

The utility model provides a gas flow meter convenient to install under pressure and an electrolytic aluminum production line, and relates to the field of gas flow detection, the gas flow meter comprises a first valve body, a limiting piece, a connecting pipe and a flow meter body, the limiting piece is provided with an installation channel, and the first valve body, the connecting pipe and the limiting piece are sequentially connected and communicated; at least one of the first valve body and the limiting piece is detachably connected with the connecting pipe, and the end, away from the connecting pipe, of the first valve body is used for being installed on a to-be-detected pipeline. The flowmeter body comprises a probe rod and a sensing head, the sensing head is located in the connecting pipe, one end of the probe rod penetrates through the mounting channel and is connected with the sensing head, the probe rod is in airtight sealing fit with the mounting channel, and the size of the sensing head is larger than that of the mounting channel and smaller than or equal to that of the channel of the first valve body. The sensing head is used for penetrating through the first valve body to extend into the to-be-detected pipeline. On-line under-pressure mounting and dismounting of the gas flowmeter can be achieved, production stopping for pressure relief is not needed, resource waste is avoided, and the mounting and dismounting efficiency is higher.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of gas flow detection, and particularly relates to a gas flowmeter convenient to install under pressure and an electrolytic aluminium production line. BACKGROUND

[0002] Compressed air is one of the main energy consumption sources in the electrolytic aluminium production process, and is widely used in the process links such as alumina discharging, material beating and aluminium discharging. However, the production cost of compressed air is relatively high, and the pipeline is relatively long. When the pipeline leaks abnormally, the consumption of compressed air will increase significantly, thereby causing the increase of energy consumption and unit production cost. In order to quickly find and handle the leakage of the compressed air conveying pipeline, a gas flowmeter needs to be installed on the main pipeline and each branch pipeline of compressed air to monitor the use of compressed air in real time. However, most electrolytic aluminium manufacturers do not configure a gas flowmeter during the arrangement and construction of the compressed air conveying pipeline, and need to re-install the gas flowmeter on the existing compressed air branch pipeline.

[0003] In the related art, there are two ways to install a gas flowmeter on a compressed air conveying pipeline: one is to install it during the shutdown of the electrolytic aluminium production line. However, the electrolytic aluminium production line usually runs uninterruptedly throughout the year, and it is difficult to find a construction opportunity unless the production line is abnormal, which affects the installation efficiency of the flowmeter. The other is to close the compressed air valve of a specific area, and then install the gas flowmeter after the gas in the compressed air branch pipeline of the area is discharged. Since the pipeline in the electrolytic production area is relatively long, and the amount of stored compressed air is relatively large, the discharging time is relatively long, which not only causes the waste of compressed air resources, but also affects the installation efficiency of the flowmeter. SUMMARY

[0004] The utility model aims at solving the technical problem of low efficiency of arranging a gas flowmeter on a compressed air conveying pipeline in the related art.

[0005] On the one hand, the utility model provides a kind of gas flowmeter convenient to install under pressure, including first valve body, limiting piece, connecting pipe and flowmeter body, the limiting piece has installation passageway, the first valve body, the connecting pipe and the limiting piece are sequentially connected and communicate, and at least one of the first valve body and the limiting piece is detachably connected with the connecting pipe, the first valve body is used to be installed on the pipeline to be measured away from one end of the connecting pipe 3;The flowmeter body includes probe rod and sensing head, the sensing head is located in the connecting pipe, one end of the probe rod passes through the installation passageway and is connected with the sensing head, the probe rod is in airtight sealing cooperation with the installation passageway, the size of the sensing head is greater than the size of the installation passageway and less than or equal to the size of the passageway of the first valve body, the sensing head is used to pass through the first valve body to extend into the pipeline to be measured.

[0006] Optionally, the limiting member is a second valve body, and the channel of the second valve body forms the installation channel.

[0007] Optionally, the gas flow meter that is easy to install under pressure also includes a sealing assembly disposed at the end of the limiting member away from the connecting pipe, the sealing assembly being used to seal the limiting member to the probe.

[0008] Optionally, the sealing assembly includes a connector and a locking nut. The connector is sleeved on the outside of the probe rod. One end of the connector is fixedly connected to the mounting channel, and the other end of the connector is sealed and locked to the probe rod by the locking nut.

[0009] Optionally, the sealing assembly further includes a sealing ring disposed between the connector and the locking nut.

[0010] Optionally, the locking nut has a locking hole extending through it along its axial direction, the inner wall of the locking hole has a limiting step surface, the end of the connector away from the limiting member is inserted into the locking hole and abuts against the limiting step surface, and the sealing ring is disposed between the connector and the limiting step surface;

[0011] And / or, the sealing ring is a conical sealing ring.

[0012] Optionally, the gas flow meter that is easy to install under pressure also includes a pipe joint, one end of which is used to install on the pipe to be measured, and the other end of which is connected to the end of the first valve body away from the connecting pipe.

[0013] And / or, the flow meter body further includes a display head and a signal line, the display head is installed at the end of the probe away from the sensing head, the signal line is located inside the probe, and the display head is connected to the sensing head through the signal line.

[0014] Optionally, the probe is detachably connected to the sensing head.

[0015] Optionally, the probe rod is provided with a limiting block at one end away from the sensing head. The limiting block is used to limit contact with the end of the limiting member away from the connecting pipe when the sensing head is inserted into the pipe to be tested.

[0016] On the other hand, this utility model also proposes an electrolytic aluminum production line, including a compressed air conveying pipeline and the aforementioned pressurized gas flow meter, wherein the pressurized gas flow meter is installed on the compressed air conveying pipeline.

[0017] This utility model provides a gas flow meter that is easy to install under pressure and an electrolytic aluminum production line, which has at least the following advantages compared to the prior art:

[0018] When installing the gas flow meter of this utility model, first install one end of the first valve body on the compressed air delivery pipeline to be tested. At this time, there is no hole in the pipeline to be tested, and the normal flow of gas in the pipeline is not affected. Then, a pressure tap can be connected to the other end of the first valve body. The drill bit of the pressure tap is passed through the channel of the first valve body to drill a hole in the pipeline to be tested. Then, the pressure tap is removed and the first valve body is closed. At the same time, one end of the probe of the flow meter body is passed through the installation channel of the limiting member and connected to the sensor head to complete the assembly of the limiting member and the flow meter body. Then, the limiting member is connected to the end of the first valve body away from the pipeline to be tested through the connecting pipe. With the first valve body closed and the sensor head inside the connecting pipe, the gas in the pipe under test flows normally. Next, the first valve body is opened, allowing the gas in the pipe under test to pass through it and enter the connecting pipe. Because the sensor head is located inside the connecting pipe and its size is larger than the mounting channel of the limiting component, the sensor head contacts the limiting component under the impact of the gas and is not pushed out. Simultaneously, the sensor head prevents gas from leaking outwards along the connecting pipe. Furthermore, by ensuring an airtight seal between the probe and the mounting channel of the limiting component, gas leakage is virtually eliminated. Finally, the probe is pushed so that the sensor head passes through the channel of the first valve body and extends into the pipe under test.

[0019] When disassembly is required, pull the probe of the flowmeter body outward to allow the sensor head to exit the pipe to be measured. Since the size of the sensor head is larger than the channel size of the limiting component, the sensor head is fully withdrawn when it comes into contact with the limiting component. At this point, the sensor head is completely withdrawn from the first valve body. Next, close the first valve body to isolate the gas in the pipe to be measured. Since at least one of the first valve body and the limiting component is detachably connected to the connecting pipe, the connection between the connecting pipe and the limiting component or the connection between the connecting pipe and the first valve body can be disconnected. The limiting component and the flowmeter body can then be removed from the first valve body for inspection or replacement. This allows for online pressurized installation and disassembly without shutting down or depressurizing the pipe to be measured, thus avoiding waste of air in the pipe and providing high installation and disassembly efficiency. Attached Figure Description

[0020] Figure 1 This is an exploded structural diagram of a gas flow meter that is easy to install under pressure according to an embodiment of the present utility model.

[0021] Figure 2 This is a schematic diagram of one of the states of the gas flow meter, which is easy to install under pressure, after it is installed on the pipeline to be measured according to an embodiment of the present utility model.

[0022] Figure 3 This is a schematic diagram of another state after the gas flow meter, which is easy to install under pressure, is installed on the pipeline to be measured according to an embodiment of the present utility model.

[0023] Figure 4 for Figure 3 Enlarged diagram of point A in the middle.

[0024] Explanation of reference numerals in the attached figures:

[0025] 1. First valve body; 2. Limiting component; 3. Connecting pipe; 4. Flow meter body; 41. Probe; 42. Sensor head; 43. Display head; 44. Limiting block; 5. Sealing assembly; 51. Connecting joint; 52. Locking nut; 521. Limiting step surface; 53. Sealing ring; 6. Pipe joint; 7. Pipe to be tested. Detailed Implementation

[0026] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0027] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fitting" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0028] In addition, it should be noted that in the description of this utility model, the terms and nouns in each embodiment, such as "upper," "lower," "front," and "rear," which indicate the location, are only used to simplify the description of the positional relationship based on the accompanying drawings. They do not mean that the components and devices referred to must be operated in accordance with the specific location and limited operation, method, and structure in the specification. Such directional terms do not constitute a limitation on this utility model.

[0029] like Figures 1-3As shown in the figure, a gas flow meter for easy installation under pressure according to an embodiment of the present invention includes a first valve body 1, a limiting member 2, a connecting pipe 3, and a flow meter body 4. The limiting member 2 has an installation channel. The first valve body 1, the connecting pipe 3, and the limiting member 2 are sequentially connected and communicate with each other. At least one of the first valve body 1 and the limiting member 2 is detachably connected to the connecting pipe 3. The end of the first valve body 1 away from the connecting pipe 3 is used to install on the pipe 7 to be measured. The flow meter body 4 includes a probe 41 and a sensing head 42. The sensing head 42 is located inside the connecting pipe 3. One end of the probe 41 passes through the installation channel and is connected to the sensing head 42. The probe 41 and the installation channel are airtightly sealed. The size of the sensing head 42 is larger than the size of the installation channel and smaller than or equal to the channel size of the first valve body 1. The sensing head 42 is used to pass through the first valve body 1 to extend into the pipe 7 to be measured.

[0030] Specifically, the channel of the first valve body 1 is used to allow fluids such as gas to pass through when the first valve body 1 is open. The channel of the first valve body 1 can be a channel with uniform thickness or a variable cross-section channel. The limiting member 2 can be a customized part, and the installation channel of the limiting member 2 can be a channel with uniform thickness or a variable cross-section channel. The probe 41 of the flowmeter body 4 is a slender rod with a diameter slightly smaller than the size of the installation channel of the limiting member 2. To be precise, the diameter of the probe 41 is smaller than the diameter at the smallest point of the cross-section of the installation channel, i.e., the minimum diameter. For example, the diameter of the probe 41 can be 0.2-1mm smaller than the minimum diameter of the installation channel to ensure that the probe 41 can pass smoothly through the installation channel and transmit the signal. The sensing head 42 is installed at one end of the probe 41 and is used to detect gas flow information; the flow meter body 4 can be a thermal gas mass flow meter body. The size of the sensing head 42 of the flow meter body 4 being larger than the installation channel size of the limiting member 2 means that the size of the sensing head 42 of the flow meter body 4 is larger than the size of the smallest cross-section of the installation channel, that is, the minimum diameter. For example, the size of the sensing head 42 can be larger than the minimum diameter of the first valve body 1 by 0.5-1mm. The size of the sensing head 42 being less than or equal to the channel size of the first valve body 1 means that the size of the sensing head 42 being less than or equal to the size of the smallest cross-section of the channel of the first valve body 1, that is, the minimum diameter.

[0031] The first valve body 1 is connected to the mounting channel of the limiting member 2 via the connecting pipe 3. One end of the probe 41 passes through the mounting channel to connect with the sensing head 42. The length of the connecting pipe 3 can be designed according to the size of the sensing head 42. The sensing head 42 can be accommodated within the connecting pipe 3, ensuring that the sensing head 42 does not interfere with the valve core of the first valve body 1, thus ensuring that the first valve body 1 can open and close freely. The connecting pipe 3 can be a custom-made integral part, or it can be assembled using universal adjusting short connectors and internal and external connectors.

[0032] At least one of the first valve body 1 and the limiting member 2 is detachably connected to the connecting pipe 3, which may include three situations: the first valve body 1 is detachably connected to one end of the connecting pipe 3, and the limiting member 2 is fixedly connected to the other end of the connecting pipe 3, such as by welding; or, the first valve body 1 is fixedly connected to one end of the connecting pipe 3, and the limiting member 2 is detachably connected to the other end of the connecting pipe 3; or, both ends of the connecting pipe 3 are detachably connected to the first valve body 1 and the limiting member 2, respectively. Regardless of the connection method, the purpose is to ensure that the limiting member 2, together with the flow meter body 4, can be detached from the first valve body 1.

[0033] When installing the gas flow meter of this embodiment, first install one end of the first valve body 1 on the pipe to be measured 7. At this time, there is no hole in the pipe to be measured 7, and the normal flow of gas in the pipe to be measured 7 is not affected. Then, a pressure tap can be connected to the other end of the first valve body 1. The drill bit of the pressure tap is used to drill a hole in the pipe to be measured 7 through the channel of the first valve body 1. Then, the pressure tap is removed and the first valve body 1 is closed. At the same time, one end of the probe 41 of the flow meter body 4 is passed through the installation channel of the limiting member 2 and connected to the sensing head 42 to complete the assembly of the limiting member 2 and the flow meter body 4. Then, the limiting member 2 is connected to the end of the first valve body 1 away from the pipe to be measured 7 through the connecting pipe 3. The sensing head 42 is located at the connection Inside pipe 3, the first valve body 1 is closed, and the gas in the pipe 7 under test continues to flow normally. When the first valve body 1 is opened, the gas in the pipe 7 under test will pass through the first valve body 1 and enter the connecting pipe 3. Since the sensing head 42 is located inside the connecting pipe 3 and the size of the sensing head 42 is larger than the size of the installation channel of the limiting member 2, the sensing head 42 will abut against the limiting member 2 under the impact of the gas and will not be pushed out of the limiting member 2. At the same time, the sensing head 42 can prevent the gas from leaking outward along the connecting pipe 3. Furthermore, by making the probe 41 and the channel of the limiting member 2 airtightly sealed, the gas will not leak outward at all. Then, push the probe 41 so that the sensing head 42 passes through the channel of the first valve body 1 and extends into the pipe 7 under test.

[0034] When disassembly is required, pull the probe 41 of the flowmeter body 4 outward to allow the sensing head 42 to exit the pipe 7 to be measured. Since the size of the sensing head 42 is larger than the size of the installation channel of the limiting member 2, the sensing head 42 is fully withdrawn when it comes into contact with the limiting member 2. At this time, the sensing head 42 is completely withdrawn from the first valve body 1. Then, close the first valve body 1 to isolate the gas in the pipe 7 to be measured. Since at least one of the first valve body 1 and the limiting member 2 is detachably connected to the connecting pipe 3, the connection between the connecting pipe 3 and the limiting member 2 or the connection between the connecting pipe 3 and the first valve body 1 can be released. The limiting member 2 and the flowmeter body 4 can be removed from the first valve body 1 together for inspection or replacement of the flowmeter body 4. This achieves online pressurized installation and disassembly without the need to shut down or depressurize the pipe 7 to be measured, thus avoiding waste of air in the pipe and improving installation and disassembly efficiency.

[0035] It should be noted that after the pressurized tapping tool drills a hole in the pipe 7 to be tested and is removed, the first valve body 1 can be opened and closed several times quickly, so that the gas in the pipe 7 to be tested blows the debris generated by the tapping out of the first valve body 1, and at the same time, no unnecessary gas leakage will occur.

[0036] Optionally, the limiting member 2 is a second valve body, and the channel of the second valve body forms the installation channel. The second valve body and the first valve body can be ball valves of the same type but different specifications. They are smaller in size, occupy less space, have good sealing performance, and can be opened or closed by rotating the valve stem by only 90°, making them easy to operate.

[0037] The limiting component 2 uses a valve body, which is a general-purpose component. There is no need to specially manufacture custom parts, which simplifies the manufacturing process of the gas flow meter. Moreover, the flow meter manufacturer usually has pre-assembled valve bodies and flow meter bodies 4 sold as a set. Since the limiting component 2 uses a valve body, the pre-assembled valve body and flow meter body 4 can be purchased directly without disassembling and reassembling the valve body, which simplifies the installation process of the gas flow meter.

[0038] like Figure 1 As shown, optionally, the gas flow meter that is easy to install under pressure also includes a sealing component 5, which is disposed at the end of the limiting member 2 away from the connecting pipe 3, and is used to seal the limiting member 2 and the probe 41.

[0039] In this embodiment, the sealing component 5 achieves a sealed connection between the limiting component 2 and the probe 41, ensuring that gas will not leak out from the installation channel between the probe 41 and the limiting component 2 during the movement of the probe 41 or after it has been moved into place, thereby improving the sealing effect and avoiding resource waste caused by gas leakage.

[0040] It should be noted that sealing tape can also be wrapped around the joints of various pipe fittings, such as the joint between the first valve body 1 and the connecting pipe 3, the joint between the limiting member 2 and the connecting pipe 3, and the joint between the first valve body 1 and the pipe to be tested 7, to improve the sealing performance and prevent air leakage.

[0041] like Figure 4 As shown, optionally, the sealing assembly 5 includes a connector 51 and a locking nut 52. The connector 51 is sleeved on the outside of the probe rod 41. One end of the connector 51 is fixedly connected to the mounting channel, and the other end of the connector 51 is sealed and locked to the probe rod 41 by the locking nut 52.

[0042] In this embodiment, the connector 51 is tubular. The connector 51 and the locking nut 52 can be pre-fitted onto the probe 41. When the probe 41 passes through the installation channel of the limiting member 2, one end of the connector 51 is inserted into the installation channel and threadedly connected to the installation channel to prevent gas leakage from the gap between the installation channel of the limiting member 2 and the probe 41. Then, the locking nut 52 is tightened to lock the connector 51 onto the probe 41, achieving a relative seal between the limiting member 2 and the probe 41. When it is necessary to move the probe 41, the locking nut 52 can be loosened appropriately to allow the probe 41 to move smoothly.

[0043] In other embodiments, the sealing assembly 5 may be a sealing gasket, which is sleeved over the probe 41, and the end of the limiting member 2 away from the connecting pipe 3 may be sealed to the probe 41 through the sealing gasket.

[0044] like Figure 4 As shown, optionally, the sealing assembly 5 further includes a sealing ring 53, which is disposed between the connector 51 and the locking nut 52.

[0045] In this embodiment, the sealing ring 53 can be an O-ring. By setting the sealing ring 53 between the connector 51 and the locking nut 52, and tightening the locking nut 52, the sealing ring 53 is pressed onto the connector 51 to prevent gas from leaking from the gap between the connector 51 and the locking nut 52, which helps to ensure the sealing effect between the probe 41 and the limiting member 2.

[0046] like Figure 4 As shown, optionally, the locking nut 52 is provided with a locking hole that extends through it along its axial direction, and the inner wall of the locking hole is provided with a limiting step surface 521. The end of the connector 51 away from the limiting member 2 is inserted into the locking hole and abuts against the limiting step surface 521. The sealing ring 53 is disposed between the connector 51 and the limiting step surface 521.

[0047] Specifically, the locking hole is a threaded hole, and the end of the connector 51 away from the limiting member 2 is provided with an external thread that matches the threaded hole. The inner wall of the locking hole is provided with an inwardly protruding limiting step surface 521.

[0048] The connector 51 is inserted into the locking hole of the locking nut 52 and locked by thread engagement. When the end face of the connector 51 away from the limiting member 2 abuts against the limiting step surface 521 of the locking hole, it indicates that the locking is in place. At this time, the limiting step surface 521 presses the sealing ring 53 onto the connector 51 to achieve locking and sealing.

[0049] like Figure 4 As shown, optionally, the sealing ring 53 is a conical sealing ring, which has better sealing performance and pressure resistance than ordinary flat sealing rings. The conical sealing ring has a conical structure with one end smaller than the other. The small end of the sealing ring 53 is located close to the connector 51 and can be inserted into the connector 51. The large end of the sealing ring 53 contacts the limiting step surface 521. When the locking nut 52 is tightened, the locking nut 52 can apply a more stable compressive force to the sealing ring 53 through the limiting step surface 521, ensuring the sealing effect of the sealing ring 53.

[0050] like Figures 1-3 As shown, optionally, the gas flow meter that is easy to install under pressure also includes a pipe joint 6, one end of which is used to install on the pipe 7 to be measured, and the other end of which is connected to the end of the first valve body 1 away from the connecting pipe 3.

[0051] Specifically, the length of the pipe joint 6 can be flexibly designed as needed. One end of the pipe joint 6 can be welded and fixed to the pipe 7 to be tested, and the other end can be threaded and threaded to the first valve body 1. By setting a pipe joint 6 of appropriate length, the first valve body 1, the limiting member 2 and the flow meter body 4 can be arranged in a suitable position for easy operation.

[0052] Here, the pipe joint 6 can be perpendicularly connected to the pipe to be tested 7. The straight line where the pipe joint 6 is located intersects the center line of the pipe to be tested 7 perpendicularly, so that the sensor head 42 can extend into the middle of the pipe to be tested 7 after passing through the first valve body 1 and the pipe joint 6, so as to achieve accurate measurement of the flow rate inside it.

[0053] like Figures 1-3 As shown, optionally, the flow meter body 4 also includes a display head 43 and a signal line. The display head 43 is installed at the end of the probe 41 away from the sensing head 42. The signal line is located inside the probe 41. The display head 43 is connected to the sensing head 42 through the signal line.

[0054] Specifically, the display head 43 is connected to the sensor head 42 via a signal line. The flow information detected by the sensor head 42 can be displayed by the display head 43. The display head 43 is installed at the end of the probe 41 away from the sensor head 42, that is, away from the pipe 7 to be measured, making the reading more convenient.

[0055] Optionally, the probe 41 is detachably connected to the sensing head 42. The detachable connection between the probe 41 and the sensing head 42 can be a threaded connection. During installation, for example... Figure 1 As shown, first pass one end of the probe 41 through the limiting member 2 and then connect it to the sensing head 42. Then, as... Figure 2 As shown, the limiting member 2 is then connected to the first valve body 1 through the connecting pipe 3, so that the limiting member 2 and the flow meter body 4 can be assembled even when the size of the sensing head 42 is larger than the limiting member 2, that is, the sensing head 42 cannot pass through the limiting member 2 together with the probe 41. The installation is simple and convenient.

[0056] like Figure 1 , Figure 2 and Figure 4 As shown, optionally, the end of the probe 41 away from the sensing head 42 is provided with a limiting block 44, which is used to limit the contact with the end of the limiting member 2 away from the connecting pipe 3 when the sensing head 42 is inserted into the pipe to be tested 7.

[0057] The limiting block 44 can move with the probe rod 41. When the limiting block 44 moves with the probe rod 41 to the end of the limiting member 2 away from the connecting pipe 3, the depth of the sensor head 42 inserted into the pipe 7 to be measured just meets the requirements. In other words, when the depth of the sensor head 42 inserted into the pipe 7 to be measured meets the requirements, the limiting block 44 can abut against the end of the limiting member 2 away from the connecting pipe 3 to limit the probe rod 41 from moving further. Thus, the positioning and assembly of the flow meter body 4 can be realized.

[0058] Optionally, the limiting block 44 can move relative to the probe rod 41 and lock its position relative to the probe rod 41. Based on the measurement results such as the diameter of the pipe 7 to be measured, the length of the first valve body 1, the length of the limiting member 2, and the length of the connecting pipe 3, the required insertion depth of the probe rod 41 when the sensing head 42 is inserted into the pipe 7 to be measured is calculated. Then, according to the calculated depth value, the limiting block 44 is moved to a suitable position relative to the probe rod 41 and fixed, so that when the limiting block 44 moves with the probe rod 41 to abut against the end of the limiting member 2 away from the connecting pipe 3, the insertion depth of the sensing head 42 into the pipe 7 to be measured just meets the requirements, thereby realizing the positioning and assembly of the flow meter body 4.

[0059] Another embodiment of this utility model provides an electrolytic aluminum production line, including a compressed air conveying pipeline and the aforementioned pressurized gas flow meter, wherein the pressurized gas flow meter is installed on the compressed air conveying pipeline. The pressurized gas flow meter enables pressurized installation on the compressed air conveying pipeline without requiring production stoppage, without air leakage, and with high installation and disassembly efficiency.

[0060] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. A gas flow meter that is easy to install under pressure, characterized in that, The device includes a first valve body (1), a limiting member (2), a connecting pipe (3), and a flow meter body (4). The limiting member (2) has an installation channel. The first valve body (1), the connecting pipe (3), and the limiting member (2) are connected and communicate with each other in sequence. At least one of the first valve body (1) and the limiting member (2) is detachably connected to the connecting pipe (3). The end of the first valve body (1) away from the connecting pipe (3) is used to install on the pipe (7) to be measured. The flow meter body (4) includes a probe. (41) and a sensing head (42), the sensing head (42) being located inside the connecting pipe (3), one end of the probe (41) passing through the mounting channel and connected to the sensing head (42), the probe (41) being airtightly sealed to the mounting channel, the size of the sensing head (42) being larger than the size of the mounting channel and smaller than or equal to the channel size of the first valve body (1), the sensing head (42) being used to pass through the first valve body (1) to extend into the pipe (7) to be tested.

2. The gas flow meter for easy installation under pressure according to claim 1, characterized in that, The limiting member (2) is a second valve body, and the channel of the second valve body forms the installation channel.

3. The gas flow meter for easy installation under pressure according to claim 1, characterized in that, It also includes a sealing assembly (5), which is disposed at the end of the limiting member (2) away from the connecting pipe (3), and the sealing assembly (5) is used to seal the limiting member (2) and the probe (41).

4. The gas flow meter for easy installation under pressure according to claim 3, characterized in that, The sealing assembly (5) includes a connector (51) and a locking nut (52). The connector (51) is sleeved on the outside of the probe (41). One end of the connector (51) is fixedly connected to the installation channel, and the other end of the connector (51) is sealed and locked to the probe (41) by the locking nut (52).

5. The gas flow meter for easy installation under pressure according to claim 4, characterized in that, The sealing assembly (5) further includes a sealing ring (53) disposed between the connector (51) and the locking nut (52).

6. The gas flow meter for easy installation under pressure according to claim 5, characterized in that, The locking nut (52) is provided with a locking hole that extends through it along its axial direction. The inner wall of the locking hole is provided with a limiting step surface (521). The end of the connector (51) away from the limiting member (2) is inserted into the locking hole and abuts against the limiting step surface (521). The sealing ring (53) is disposed between the connector (51) and the limiting step surface (521). And / or, the sealing ring (53) is a conical sealing ring.

7. The gas flow meter for easy installation under pressure according to claim 1, characterized in that, It also includes a pipe joint (6), one end of which is used to be installed on the pipe to be tested (7), and the other end of which is connected to the end of the first valve body (1) away from the connecting pipe (3); And / or, the flow meter body (4) further includes a display head (43) and a signal line. The display head (43) is installed at the end of the probe (41) away from the sensing head (42). The signal line is located inside the probe (41). The display head (43) is connected to the sensing head (42) through the signal line.

8. The gas flow meter for easy installation under pressure according to claim 1, characterized in that, The probe (41) is detachably connected to the sensing head (42).

9. The gas flow meter for easy installation under pressure according to claim 1, characterized in that, The probe (41) is provided with a limiting block (44) at one end away from the sensing head (42). The limiting block (44) is used to limit the contact with the end of the limiting member (2) away from the connecting pipe (3) when the sensing head (42) is inserted into the pipe to be tested (7).

10. An electrolytic aluminum production line, characterized in that, It includes a compressed air delivery pipeline and a gas flow meter as described in any one of claims 1-9 that is easy to install under pressure, wherein the gas flow meter is installed on the compressed air delivery pipeline.

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