An anti-interference structure of an ultrasonic gas meter

Abstract

The present invention discloses an anti-interference structure for an ultrasonic gas meter, which relates to the technical field of ultrasonic gas meters. It includes an upper housing and a lower housing. An installer is provided on the lower housing. An anti-interference connector is provided between the upper housing and the lower housing. The anti-interference connector includes a shielding solder tab, a shielding net and a locking bolt. One end of the shielding solder tab extends outward to wrap the shielding net and extends to the outer top surface of the installer, and is fixed on the installer through the locking bolt. The outer side surface of the locking bolt is laser welded to the installer, so as to form a closed and shielded state between the upper housing and the lower housing. By setting an anti-interference connector between the upper housing and the lower housing, fixing with a locking bolt, and using laser welding to weld the locking bolt to the installer provided on the lower housing, under the dual shielding effects of the anti-interference connector and laser welding, interference signals are difficult to enter the ultrasonic gas meter housing, which has the effects of improving the anti-interference performance of the gas meter and ensuring the measurement accuracy of the gas meter.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic gas meters, and more specifically, it relates to an anti-interference structure for an ultrasonic gas meter. Background Art

[0002] The ultrasonic gas meter uses the time-difference method principle to measure the gas flow rate, and reflects the fluid flow rate by measuring the difference in the speeds of ultrasonic signals propagating in the fluid in the downstream and upstream directions. Because the error caused by the change of the sound speed with the fluid temperature in the time-difference method is small and the accuracy is high, it is currently widely used. Due to its all-electronic structure characteristics, the ultrasonic gas meter has no mechanical transmission part, runs without mechanical noise, is not affected by mechanical wear and faults, the measurement accuracy does not deteriorate during long-term use, has good durability and a longer service life; without magnetic induction components, the measurement is not easily affected by magnetic fields, and has incomparable advantages in terms of volume, accuracy, repeatability, life, maintenance, and intelligent expansion compared with the previous diaphragm gas meters.

[0003] The ultrasonic gas meter is internally provided with an ultrasonic sensor. The ultrasonic sensor is a sensor that converts ultrasonic signals into other energy signals (usually electrical signals). The ultrasonic sensor uses the acoustic wave medium to perform non-contact and non-abrasive detection on the detected object. Among them, ultrasonic waves are mechanical waves with a vibration frequency higher than 20KHz. It has the characteristics of high frequency, short wavelength, small diffraction phenomenon, especially good directivity, and can become a ray and propagate in a directional manner. Therefore, the ultrasonic sensor can detect transparent or colored objects, metal or non-metal objects, solids, liquids, and powdery substances, especially in solids that are opaque to sunlight. Its detection performance is hardly affected by any environmental conditions, including soot environments and rainy days.

[0004] However, when the ultrasonic gas meter is in use, there are still situations that affect its measurement accuracy. For example, when external medium and low-frequency signals enter the ultrasonic gas meter housing, the measurement of the ultrasonic gas meter itself is interfered. Generally, the ultrasonic gas meter housing is assembled by an upper housing and a lower housing. The interference ability and penetration ability of medium and low-frequency signals are strong, and they can penetrate into the ultrasonic gas meter through the gap between the upper housing and the lower housing, thus affecting the detection accuracy of the ultrasonic gas meter.

[0005] Based on the above problems, the present invention proposes an anti-interference structure for an ultrasonic gas meter that ensures measurement accuracy. Summary of the Invention

[0006] Aiming at this problem in practical applications, the purpose of the present invention is to propose an anti-interference structure for an ultrasonic gas meter, and the specific solution is as follows:

[0007] An anti-interference structure of an ultrasonic gas meter, comprising an upper housing and a lower housing. An installer is provided on the lower housing, and the bottom end of the upper housing extends into the installer. An anti-interference connector is detachably installed between the upper housing and the lower housing. The anti-interference connector includes a shielding solder tab, a shielding net and a locking bolt. One side of the shielding solder tab is closely attached to the upper housing, and the other side abuts against the shielding net. The other side of the shielding net is closely attached to the inner side wall of the installer. One end of the shielding solder tab extends outward to wrap the shielding net and extends to the outer top surface of the installer, and is fixed to the installer through the locking bolt. The outer side surface of the locking bolt is laser welded to the installer, so as to form a closed and shielded state between the upper housing and the lower housing.

[0008] Further, a plurality of installation holes are horizontally opened at the upper edge position of the installer. The installation holes are used in cooperation with the locking bolts, and a plurality of locking bolts are uniformly arranged along the circumference of the installer.

[0009] Further, a shielding gasket is provided between the bottom end of the upper housing and the shielding solder tab.

[0010] Further, the installer and the lower housing are connected into an integral structure. The outer diameter of the installer is larger than the outer diameter of the top end of the upper housing. An installation groove is opened at the top of the installer, and the upper housing is located in the installation groove.

[0011] Further, the shielding solder tab is composed of a lower end, a middle end, a wrapping end and an extending end. The lower end is looped on the inner bottom surface of the installer. The lower end extends upward toward the upper housing through the middle end and the wrapping end wraps the top end and the outer side surface of the shielding net. The other end of the wrapping end is connected to the extending end, and the extending end extends to the outer top surface of the installer.

[0012] Further, a plurality of through holes are horizontally opened on the extending end, and a toothed line is provided between every two horizontally arranged through holes.

[0013] Further, the locking bolt has an inverted U-shaped structure, and the inner top surface of the inverted U-shaped structure is in contact with the outer top surface of the extending end.

[0014] Further, the shielding net is provided as including a bottom section and a top section connected into an integral structure. The bottom section is looped on the inner bottom surface of the installer. The top section is arranged around the inner side surface of the installer, and the top section extends out of the installer and is wrapped by the shielding solder tab.

[0015] Compared with the prior art, the beneficial effects of the present invention are as follows: In the present invention, an anti-interference connector is provided between the upper housing and the lower housing and fixed by a locking bolt. The locking bolt is welded to an installer provided on the lower housing by laser welding. Under the dual shielding effects of the anti-interference connector and laser welding, interference signals are difficult to enter the ultrasonic gas meter housing, improving the anti-interference performance of the ultrasonic gas meter and ensuring the measurement accuracy of the ultrasonic gas meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is an overall schematic diagram of an embodiment of the present invention;

[0017] Figure 2 For the present invention Figure 1 is a partial enlarged view of part A in

[0018] Figure 3 For the present invention Figure 2 is a partial enlarged view of part B in

[0019] Reference numerals: 1, upper housing; 2, lower housing; 3, installer; 4, anti-interference connector; 5, shielding solder tab; 51, lower end; 52, middle end; 53, wrapping end; 54, extending end; 55, through hole; 56, tooth line; 6, shielding net; 61, bottom section; 62, top section; 7, locking bolt; 8, mounting hole; 9, shielding gasket; 10, mounting groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0022] As Figure 1 shown, an anti-interference structure of an ultrasonic gas meter includes an upper housing 1 and a lower housing 2. An installer 3 is provided on the lower housing 2, and the bottom end of the upper housing 1 extends into the installer 3. Specifically, the installer 3 and the upper housing 1 are connected into an integral structure. The outer diameter of the installer 3 is larger than the outer diameter of the top end of the upper housing 1. An installation groove 10 is opened at the top of the installer 3, and the upper housing 1 is located in the installation groove 10. The inner diameter of the installation groove 10 is slightly larger than the outer diameter of the upper housing 1 to leave a gap between the installer 3 and the upper housing 1.

[0023] In order to prevent medium and low-frequency signals from entering the ultrasonic gas meter through the installation gap between the upper shell 1 and the lower shell 2 and affecting the measurement accuracy of the ultrasonic gas meter, in the present invention, an anti-interference connector 4 is detachably installed between the upper shell 1 and the lower shell 2, that is, the anti-interference device is installed in the gap left between the upper shell 1 and the installer 3. The anti-interference connector 4 forms a closed shielding structure between the upper shell 1 and the lower shell 2 to prevent medium and low-frequency signals from entering the ultrasonic gas meter and ensure the metering accuracy inside the ultrasonic gas meter.

[0024] Specifically, in a possible embodiment, as Figure 2-3 shown, the anti-interference connector 4 includes a shielding solder tab 5, a shielding mesh 6 and a locking bolt 7.

[0025] One side of the shielding solder tab 5 is in close contact with the upper shell 1, and the other side abuts against the shielding mesh 6, and the other side of the shielding mesh 6 is in close contact with the inner side wall of the installer 3.

[0026] One end of the shielding solder tab 5 extends outward to wrap the shielding mesh 6 and extends to the outer top surface of the installer 3, and is fixed to the installer 3 by a locking bolt 7. The outer side surface of the locking bolt 7 is laser welded to the installer 3 so that a closed and shielded shape is formed between the upper shell 1 and the lower shell 2.

[0027] Preferably, both the shielding solder tab 5 and the shielding mesh 6 are made of a metal material that is bendable, has good plasticity and ductility and has shielding properties. Such as an alloy.

[0028] In this way, a double shielding structure is formed by the shielding solder tab 5 and the shielding mesh 6 to form a closed shielding structure between the upper shell 1 and the installer 3 and is fixed by a locking bolt 7. Not only is the interference signal shielded outside the ultrasonic gas meter housing, but also the structure is simple, the assembly is convenient, the processing efficiency is greatly improved, and the production cost of the enterprise is saved.

[0029] In addition, the locking bolt 7 is connected to the installer 3 by laser welding. Laser welding makes the connection between the locking bolt 7 and the installer 3 form an integral metal, and it is difficult for interference signals to penetrate in, which can effectively shield the interference signals outside the ultrasonic gas meter, ensure the normal metering work of the ultrasonic gas meter, and further ensure the metering accuracy.

[0030] Furthermore, in order to avoid damage to both of them caused by direct contact between the upper shell 1 and the shielding solder tab 5 and ensure the shielding effect and shielding quality, in this application, a shielding gasket 9 is provided between the bottom end of the upper shell 1 and the shielding solder tab 5. Preferably, the shielding gasket 9 can be a shielding and absorbing gasket. The shielding gasket 9 is provided in a ring shape on the top surface of the shielding solder tab 5. Through the setting of the shielding gasket 9, it can not only play a buffering and protecting role between the upper shell 1 and the installer 3, but also further improve the anti-interference performance of the entire anti-interference connector 4 and further improve the metering accuracy of the ultrasonic gas meter.

[0031] More specifically, the shielding net 6 is provided to include a bottom section 61 and a top section 62 connected into an integral structure. The bottom section 61 is looped on the inner bottom surface of the installer 3, and the top section 62 is arranged around the inner side surface of the installer 3. Moreover, the top section 62 extends out of the installer 3 and is wrapped by the shielding solder tab 5. One reason for the top end to extend out of the installer 3 is to improve the shielding effect, and the other is to facilitate the operation of the staff during installation.

[0032] The shielding solder tab 5 is composed of a lower end 51, a middle end 52, a wrapping end 53 and an extending end 54. The lower end 51 is looped on the top surface of the shielding net 6, the middle end 52 is looped on the outer side surface of the shielding net 6. The lower end 51 extends towards the upper housing 1 through the middle end 52 and the wrapping end 53 wraps the top end and the outer side surface of the shielding net 6. The other end of the wrapping end 53 is connected to the extending end 54, and the extending end 54 extends to the outer top surface of the installer 3.

[0033] In this way, the shielding net 6 and the shielding solder tab 5 cooperate with each other to achieve a comprehensive wrapping and shielding of the lower housing 2 in the horizontal and vertical directions, so as to achieve comprehensive anti-interference.

[0034] And, an installation hole 8 is provided at the upper edge position of the installer 3. The installation hole 8 and the locking bolt 7 are used in cooperation. A plurality of through holes 55 are transversely provided on the extending end 54 of the shielding solder tab 5. The locking bolt 7 has an inverted U-shaped structure, and the inner top surface of the inverted U-shaped structure is in contact with the outer top surface of the extending end 54. In this way, when the locking bolt 7 works, one end of its inverted U-shaped structure penetrates through the through hole 55, and the other end penetrates into the installation hole 8 for locking. Only the inner top surface of the inverted U of the locking bolt 7 in the locking abuts against the outer top surface of the shielding solder tab 5. In this way, the connection between the end face of the welding solder tab and the installer 3 is also in a closed state. Finally, the locking bolt 7 is welded to the installer 3 by laser welding to form a completely closed shielding structure to ensure the anti-interference performance.

[0035] In order to ensure the comprehensiveness of the locking of the locking bolt 7, a plurality of locking bolts 7 are uniformly arranged along the circumferential direction of the installer 3. The locking bolts 7 are evenly distributed along the circumferential direction of the welding solder tab to ensure the comprehensiveness of the circumferential closure. [[ID=1⑥]]

[0036] In addition, after laser welding, the upper housing 1 and the lower housing 2 form an integral metal. When problems occur in the ultrasonic gas meter and need to be repaired, it is inconvenient for the staff to disassemble the ultrasonic gas meter housing for repair. In order to avoid this situation and facilitate disassembly and repair, therefore, in this application, a structure is also designed:

[0037] Specifically, a plurality of mounting holes 8 are horizontally formed along the upper edge position of the mount 3, and a plurality of through holes 55 are horizontally formed along the extending end 54 of the shielding solder tab 5, and a tooth line 56 is provided between every two horizontally arranged through holes 55. In this way, when it is necessary to disassemble and separate the upper housing 1 and the lower housing 2, the shielding solder tab 5 is disconnected along the tooth line 56, so that the whole shielding solder tab 5 is separated from the locking bolt 7 connected to its tail end. At this time, the whole formed by laser welding on the locking bolt 7 does not restrict the shielding solder tab 5. At this time, the upper housing 1 and the lower housing 2 can be easily disassembled. When it is necessary to reconnect and ensure the anti-interference performance between the upper housing 1 and the lower housing 2, the previous locking steps are repeated using the locking bolt 7 again. The locking bolt 7 moves inward by one layer of the mounting hole 8 and the through hole 55, and then they can be laser welded and connected together again.

[0038] According to the number of the mounting holes 8 and the through holes 55 arranged in the horizontal direction, the detachable number between the upper housing 1 and the lower housing 2 can be determined.

[0039] The specific implementation principle of the present invention is as follows: during operation, first, the anti-interference connector 4 is installed in the mount 3 on the upper housing 1 and the lower housing 2 and fixed by the locking bolt 7. Under the double shielding effect of the anti-interference connector 4 and laser welding, interference signals are difficult to enter the ultrasonic gas meter housing, improving the anti-interference performance of the ultrasonic gas meter and ensuring the measurement accuracy of the ultrasonic gas meter.

[0040] The above are only the preferred embodiments of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An anti-interference structure of an ultrasonic gas meter, comprising an upper shell (1) and a lower shell (2), characterized in that, An installer (3) is provided on the lower housing (2). The bottom end of the upper housing (1) extends into the installer (3). An anti-interference connector (4) is detachably installed between the upper housing (1) and the lower housing (2). The anti-interference connector (4) includes a shielding solder tab (5), a shielding net (6) and a locking bolt (7). One side of the shielding solder tab (5) is closely attached to the upper housing (1), and the other side abuts against the shielding net (6). The other side of the shielding net (6) is closely attached to the inner side wall of the installer (3). One end of the shielding solder tab (5) extends outward to wrap the shielding net (6) and extends to the outer top surface of the installer (3), and is fixed to the installer (3) by the locking bolt (7). The outer side surface of the locking bolt (7) is laser welded to the installer (3) so that a closed and shielded state is formed between the upper housing (1) and the lower housing (2). A plurality of mounting holes (8) are horizontally formed at the upper edge position of the installer (3). The mounting holes (8) are used in cooperation with the locking bolts (7), and a plurality of locking bolts (7) are uniformly arranged along the circumferential direction of the installer (3). A shielding gasket (9) is provided between the bottom end of the upper housing (1) and the shielding solder tab (5). The installer (3) and the lower housing (2) are connected into an integral structure. The outer diameter of the installer (3) is larger than the outer diameter of the top end of the upper housing (1). An installation groove (10) is formed at the top of the installer (3), and the upper housing (1) is located in the installation groove (10). The shielding solder tab (5) is composed of a lower end (51), a middle end (52), a wrapping end (53) and an extending end (54). The lower end (51) is looped on the inner bottom surface of the installer (3). The lower end (51) extends upward toward the upper housing (1) through the middle end (52), and the wrapping end (53) wraps the top end and the outer side surface of the shielding net (6). The other end of the wrapping end (53) is connected to the extending end (54), and the extending end (54) extends to the outer top surface of the installer (3). A plurality of through holes (55) are horizontally formed on the extending end (54). A tooth line (56) is provided between every two horizontally arranged through holes (55). The locking bolt (7) has an inverted U-shaped structure, and the inner top surface of the inverted U-shaped structure is in contact with the outer top surface of the extending end (54). The shielding net (6) is provided as a bottom section (61) and a top section (62) connected into an integral structure. The bottom section (61) is looped on the inner bottom surface of the installer (3). The top section (62) is arranged around the inner side surface of the installer (3), and the top section (62) extends out of the installer (3) and is wrapped by the shielding solder tab (5).

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