Flue gas ultrasonic flowmeter fixing device

Abstract

The utility model provides a flue gas ultrasonic flowmeter fixing device, a flue pipe wall is provided with a first through hole and a second through hole, the fixing device comprises a first fixing flange and a second fixing flange, the first fixing flange is installed at the first through hole in a sealing mode, and the second fixing flange is installed at the second through hole in a sealing mode. The opposite side walls of the first fixing flange and the second fixing flange are each provided with a probe fixing cylinder, the two probe fixing cylinders are both located in the flue, the two probe fixing cylinders are used for installing an ultrasonic receiving end probe and an ultrasonic transmitting end probe respectively, and the two probe fixing cylinders are further connected with a connecting rod. And the probe fixing cylinders are connected into a whole through a connecting rod. According to the fixing device, the probes of the ultrasonic flow meter are reliably fixed, and when a flue vibrates, the two probes integrally move and do not deviate relatively under the action of the fixing device, so that the influence of flue vibration on ultrasonic pulse transmitting and receiving of the probes is reduced, and the detection precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of measuring equipment technology, and in particular to a fixing device for an ultrasonic flow meter for flue gas. Background Technology

[0002] Currently, there are two main methods for calculating greenhouse gas emissions: the accounting method and the measurement method. The accounting method calculates greenhouse gas emissions primarily by the amount of fuel burned, while the measurement method directly measures emissions using a CEMS (Continuous Electromagnetic Monitoring System). The CEMS method directly measures parameters such as flue gas velocity, CO2 concentration, and humidity to obtain greenhouse gas emissions, with flue gas velocity directly affecting the carbon emission measurement results. Data from actual measurements using a CEMS system is expected to serve as a valuable reference for carbon emission monitoring. Therefore, accurate measurement of flue gas velocity is of great significance for carbon emission monitoring and carbon emission trading.

[0003] Flue gas velocity testing typically employs methods such as Pitot tube flow meters, matrix flow meters, thermal flow meters, and ultrasonic flow meters. Among these, ultrasonic flow meters measure gas velocity by exploiting the time difference in ultrasonic pulse delay. The transmitting and receiving devices are installed on opposite sides of the measuring pipe, at a specific angle to the gas flow direction. Due to the gas velocity, there is a time difference in the propagation of ultrasonic waves in the forward and reverse directions. Therefore, based on this time difference, the pipe diameter, and the installation location, the gas velocity can be calculated, and consequently, the gas flow rate.

[0004] The ultrasonic flow meter is installed on the opposite side of the inclined direction of the flue. Flues typically require fan ventilation, resulting in significant vibration. This can easily cause the ultrasonic flow meter probe to shift, leading to the ultrasonic pulse transmission and reception not being on the same straight line. This affects measurement accuracy, and may even result in no signal reception, rendering measurement impossible. Utility Model Content

[0005] The technical problem to be solved by this utility model is to provide a fixing device for an ultrasonic flow meter of flue gas, in which the transmitting end and the receiving end move as a whole without relative displacement when the flue vibrates, thereby reducing the impact of flue vibration on the transmission and reception of ultrasonic pulses by the probe and improving the detection accuracy.

[0006] This utility model is implemented as follows:

[0007] This utility model provides a fixing device for an ultrasonic flow meter for flue gas. The flue pipe wall has a first through hole and a second through hole. The fixing device includes a first fixing flange and a second fixing flange. The first fixing flange is sealed and installed at the first through hole, and the second flange is sealed and installed at the second through hole. A probe fixing cylinder is respectively provided on the opposite side wall of the first fixing flange and the second fixing flange. Both probe fixing cylinders are located inside the flue and are used to install an ultrasonic receiving probe and an ultrasonic transmitting probe, respectively. The two probe fixing cylinders are also connected by a connecting rod, and the probe fixing cylinders are connected into one unit by the connecting rod.

[0008] Furthermore, a sealing gasket for sealing the gap between the first fixed flange and the flue pipe wall is provided on the inner side of the first fixed flange.

[0009] A screw is connected to the side of the second fixed flange away from the probe fixing cylinder. The end of the screw extends to the outside of the second through hole and is connected to a fixing nut for locking the second fixed flange.

[0010] The screw is also fitted with a cylindrical sealing sleeve. The outer wall of the sealing sleeve is in contact with the second through hole. The sealing sleeve also has a flange portion. When the second fixed flange is fixed, the flange portion is located between the second fixed flange and the inner wall of the flue.

[0011] Furthermore, the end of the connecting rod has a threaded section, and the bottom of the probe fixing cylinder is also provided with a countersunk hole. The threaded section extends through the countersunk hole into the probe fixing cylinder and is fixed by a lock nut.

[0012] Furthermore, a circular hole is provided at the center of the bottom of the probe fixing cylinder, through which the ultrasonic receiving probe receives pulses and the ultrasonic transmitting probe transmits pulses.

[0013] Furthermore, each of the connecting rods has a central hole that extends through the connecting rod along its axis, and the data transmission cable of the ultrasonic receiver probe passes through the central hole and enters the probe fixing cylinder at the ultrasonic transmitter probe.

[0014] A through hole is provided at the center of the first fixed flange. The data transmission cable of the ultrasonic receiver probe and the data transmission cable of the ultrasonic transmitter are passed through the through hole to the outside of the flue and connected to the main unit of the ultrasonic flow meter.

[0015] Furthermore, the diameter of the first through hole is larger than that of the second through hole.

[0016] The advantages of this invention are: the fixing device enables reliable fixation of the ultrasonic flow meter probe. When the flue vibrates, the two probes move as a whole under the action of the fixing device without relative displacement, thereby reducing the impact of flue vibration on the probe's transmission and reception of ultrasonic pulses and improving detection accuracy. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of a flue gas ultrasonic flow meter fixing device according to the present invention.

[0019] Figure 2 This is a schematic diagram of the connection structure between the connecting rod and the probe fixing cylinder of this utility model.

[0020] Explanation of the labels in the diagram:

[0021] 1. Flue; 101. First through hole; 102. Second through hole; 2. First fixed flange; 201. Through hole; 3. Second fixed flange; 4. Probe fixing sleeve; 401. Threaded hole; 402. Countersunk hole; 403. Round hole; 5. Ultrasonic receiving probe; 6. Ultrasonic transmitting probe; 7. Connecting rod; 701. Threaded section; 702. Center hole; 8. Sealing gasket; 9. Screw; 10. Fixing nut; 11. Sealing sleeve; 12. Locking nut; 13. Main unit. Detailed Implementation

[0022] Please see Figures 1 to 2 This utility model provides a fixing device for an ultrasonic flow meter for flue gas. The flue duct 1 has a first through hole 101 and a second through hole 102 on its wall. The outer edge of the first through hole 101 is a flange face. The fixing device includes a first fixing flange 2 and a second fixing flange 3. The first fixing flange 2 is sealed and installed at the first through hole 101, and the second flange is sealed and installed at the second through hole 102. Probe fixing cylinders 4 are respectively provided on opposite side walls of the first fixing flange 2 and the second fixing flange 3. Both probe fixing cylinders 4 are located inside the flue duct 1, and are used to install an ultrasonic receiving probe 5 and an ultrasonic transmitting probe 6, respectively. The two probe fixing cylinders 4 are also connected by a connecting rod 7, and are connected as a whole by the connecting rod 7. Because the two probe fixing cylinders 4 are connected as a whole, when the flue duct 1 vibrates, the two probes move as a whole without relative displacement, thereby reducing the impact of the flue duct 1 vibration on the transmission and reception of ultrasonic pulses by the probes and improving detection accuracy.

[0023] The bottom of the probe fixing cylinder 4 is also provided with several threaded holes 401 for locking the ultrasonic receiving probe 5 and the ultrasonic transmitting probe 6; the bolts 14 that fix the two probes are screwed into the threaded holes 401.

[0024] Specifically, the inner side of the first fixed flange 2 is provided with a sealing gasket 8 for sealing the gap between the first fixed flange 2 and the wall of the flue 1; the outer edge of the first fixed flange 2 is provided with a number of fixing holes in a ring array, and the bolts 15 for fixing the first fixed flange 2 pass through the fixing holes, the sealing gasket 8 and the flange surface of the outer edge of the first through hole 101 and are then locked with nuts.

[0025] A screw 9 is connected to the side of the second fixed flange 3 away from the probe fixing cylinder 4. The end of the screw 9 extends to the outside of the second through hole 102 and is connected to a fixing nut 10 for locking the second fixed flange 3. The diameter of the first through hole 101 is larger than that of the second through hole 102.

[0026] When fixing this device inside the flue 1, the device extends into the flue 1 through the first through hole 101 and the screw 9 passes through the second through hole 102. The second fixing flange 3 is fixed by tightening the fixing nut 10. After the first fixing flange 2 is bolted on, the entire device is securely installed inside the flue 1.

[0027] The screw 9 is also fitted with a cylindrical sealing sleeve 11. The outer wall of the sealing sleeve 11 is in contact with the second through hole 102. The sealing sleeve 11 also has a flange portion. When the second fixed flange 3 is fixed, the flange portion is located between the second fixed flange 3 and the inner wall of the flue 1.

[0028] Specifically, the end of the connecting rod 7 has a threaded section 701, and the bottom of the probe fixing cylinder 4 is also provided with a countersunk hole 402. The threaded section 701 extends through the countersunk hole 402 into the probe fixing cylinder 4 and is fixed by a locking nut 12.

[0029] Specifically, a circular hole 403 is provided at the center of the bottom of the probe fixing cylinder 4. The ultrasonic receiving probe 5 receives pulses through the circular hole 403, and the ultrasonic transmitting probe 6 transmits pulses through the circular hole 403.

[0030] Specifically, each of the connecting rods 7 has a central hole 702 that passes through the connecting rod 7 along its axial direction. The data transmission cable of the ultrasonic receiving probe 5 passes through the central hole 702 and enters the probe fixing cylinder 4 at the ultrasonic transmitting probe 6.

[0031] A through hole 201 is provided at the center of the first fixed flange 2. The data transmission cable of the ultrasonic receiver probe 5 and the data transmission cable of the ultrasonic transmitter are passed through the through hole 201 to the outside of the flue 1 and connected to the main unit 13 of the ultrasonic flow meter.

[0032] One specific application of this utility model is:

[0033] The ultrasonic receiver probe 5 and the ultrasonic transmitter probe 6 are respectively secured to the bottom of the two probe mounting cylinders 4, corresponding to the circular holes 403. The two probe mounting cylinders 4 are connected as one unit by two connecting rods 7. Furthermore, when the connecting rods 7 are connected to the probe mounting cylinders 4, the data transmission cable of the ultrasonic receiver probe 5 is pre-introduced through the central hole 702 into the probe mounting cylinder 4 where the ultrasonic transmitter probe 6 is located.

[0034] Connect the probe fixing cylinder 4 of the ultrasonic receiver probe 5 to the second fixing flange 3, while the other probe fixing cylinder 4 is connected to the first fixing flange 2. When connecting, the data transmission cable of the ultrasonic receiver probe 5 and the data transmission cable of the ultrasonic transmitter are passed through the through hole 201 to the outside of the flue 1 and connected to the main unit 13 of the ultrasonic flow meter.

[0035] A sealing sleeve 11 is fitted onto the outside of the screw 9, and a sealing gasket 8 is installed on the inside of the first fixed flange 2. The device is then inserted into the flue 1 through the first through hole 101, and the screw 9 is allowed to pass through the second through hole 102. The second fixed flange 3 is then secured by tightening the locking nut 10. After the first fixed flange 2 is bolted on, the entire device is securely installed inside the flue 1.

[0036] When flue 1 vibrates, the ultrasonic receiving probe 5 and the ultrasonic transmitting probe 6 move as a whole under the action of the fixing device without relative displacement, thereby reducing the impact of flue 1 vibration on the transmission and reception of ultrasonic pulses by the probe and improving detection accuracy.

[0037] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A device for fixing an ultrasonic flow meter for flue gas, characterized in that: The flue pipe wall has a first through hole and a second through hole. The fixing device includes a first fixing flange and a second fixing flange. The first fixing flange is sealed and installed at the first through hole, and the second flange is sealed and installed at the second through hole. The opposite side walls of the first fixing flange and the second fixing flange are respectively provided with probe fixing cylinders. Both probe fixing cylinders are located inside the flue, and the two probe fixing cylinders are respectively used to install the ultrasonic receiving probe and the ultrasonic transmitting probe. The two probe fixing cylinders are also connected by a connecting rod, and the probe fixing cylinders are connected into one piece by the connecting rod.

2. The ultrasonic flow meter fixing device for flue gas as described in claim 1, characterized in that: The inner side of the first fixed flange is provided with a sealing gasket for sealing the gap between the first fixed flange and the flue pipe wall; A screw is connected to the side of the second fixed flange away from the probe fixing cylinder. The end of the screw extends to the outside of the second through hole and is connected to a fixing nut for locking the second fixed flange. The screw is also fitted with a cylindrical sealing sleeve. The outer wall of the sealing sleeve is in contact with the second through hole. The sealing sleeve also has a flange portion. When the second fixed flange is fixed, the flange portion is located between the second fixed flange and the inner wall of the flue.

3. The flue gas ultrasonic flow meter fixing device as described in claim 1, characterized in that: The end of the connecting rod has a threaded section, and the bottom of the probe fixing cylinder is also provided with a countersunk hole. The threaded section extends through the countersunk hole into the probe fixing cylinder and is fixed by a lock nut.

4. The ultrasonic flow meter fixing device for flue gas as described in claim 1, characterized in that: A circular hole is provided at the center of the bottom of the probe fixing cylinder. The ultrasonic receiving probe receives pulses through the circular hole, and the ultrasonic transmitting probe transmits pulses through the circular hole.

5. The ultrasonic flow meter fixing device for flue gas as described in claim 4, characterized in that: Each of the connecting rods has a central hole that extends through the connecting rod along its axis. The data transmission cable of the ultrasonic receiver probe passes through the central hole and enters the probe fixing cylinder at the ultrasonic transmitter probe. A through hole is provided at the center of the first fixed flange. The data transmission cable of the ultrasonic receiver probe and the data transmission cable of the ultrasonic transmitter are passed through the through hole to the outside of the flue and connected to the main unit of the ultrasonic flow meter.

6. The ultrasonic flow meter fixing device for flue gas as described in claim 1, characterized in that: The diameter of the first through hole is larger than that of the second through hole.

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