Pressure sensor for NB remote transmission diaphragm gas meter

Abstract

The utility model relates to the technical field of diaphragm gas meters, in particular to a pressure sensor for an NB remote transmission diaphragm gas meter, and aims to solve the problem of poor sealing performance due to the fact that a pressure sensor is adhered to a gas meter shell through glue in a conventional gas meter. The pressure sensor comprises a gas meter shell, an upper cover, a lower cover, a transition joint and a circuit board assembly, the upper cover and the lower cover are mutually buckled to form a containing space, the circuit board assembly is arranged in the containing space, the transition connector is installed on the end wall, away from the lower cover, of the upper cover, and one end of the transition connector penetrates through the upper cover to be connected with the circuit board assembly; a mounting hole is formed in the gas meter shell, the end, away from the lower cover, of the transition connector is inserted into the mounting hole and protrudes out of the end wall of the gas meter shell, and a sealing piece is arranged between the transition connector and the gas meter shell. The installation sealing performance of the pressure sensor and the diaphragm gas meter is improved.

Description

Technical Field

[0001] The present application relates to the technical field of diaphragm gas meters, and in particular to a pressure sensor for NB remote transmission diaphragm gas meters. Background Art

[0002] NB remote transmission diaphragm gas meter is a smart gas meter that combines traditional diaphragm gas meter and NB-IoT (narrowband Internet of Things) technology. It consists of a base meter, an intelligent control unit and a wireless remote transmission unit with an NB-IoT communication module. Based on the operator's NB-IoT network, the NB remote transmission diaphragm gas meter transmits the collected data, meter operation status and other related information to the background regularly, which can realize network meter reading, remote valve control, remote price adjustment, network payment, fault detection, intelligent alarm and other functions.

[0003] The realization of the intelligent alarm function requires timely and accurate monitoring of abnormal pressure in the gas pipeline, which usually requires the installation of a pressure sensor inside the NB remote diaphragm gas meter. Among the many performance parameters, air tightness is undoubtedly the key indicator to ensure the stable operation of the gas meter. Especially for the connection between the pressure sensor and the gas meter housing, this area is not only a weak link where gas may leak, but also the main area subject to external environmental erosion. Conventional gas meters glue the pressure sensor to the gas meter housing with glue, and the sealing is poor, so it needs to be improved. Utility Model Content

[0004] In order to improve the sealing performance of the pressure sensor and the diaphragm gas meter during installation, the present application provides a pressure sensor for an NB remote transmission diaphragm gas meter.

[0005] The present application provides a pressure sensor for a NB remote transmission diaphragm gas meter using the following technical solution:

[0006] A pressure sensor for an NB remote transmission diaphragm gas meter comprises a gas meter housing, an upper cover, a lower cover, a transition joint and a circuit board assembly, wherein the upper cover and the lower cover are buckled together to form an accommodating space, the circuit board assembly is arranged in the accommodating space, the transition joint is installed on a side of the upper cover away from the lower cover, and one end of the transition joint passes through the upper cover and is connected to the circuit board assembly; a mounting hole is provided on the gas meter housing, and one end of the transition joint away from the lower cover is inserted into the mounting hole and protrudes from the end wall of the gas meter housing, and a sealing member is provided between the transition joint and the gas meter housing.

[0007] By adopting the above technical solution, when installing the pressure sensor, the operator first fixedly installs the circuit board assembly on the side wall of one side of the upper cover, then installs the transition joint on the side wall of the other side of the upper cover, and connects the transition joint with the circuit board assembly. At this time, the upper cover and the lower cover are buckled together. The operator holds the lower cover and passes the transition joint out through the installation hole from the inside of the gas meter housing, and then seals and fixes the transition joint on the gas meter housing from the outside of the gas meter housing through the seal. Compared with the conventional adhesive connection method, the stability and sealing performance of the connection between the transition joint and the gas meter housing are improved.

[0008] Optionally, the lower cover includes a bottom plate and four lower side plates surrounding the bottom plate on all four sides. The bottom plate and the four lower side plates are integrally formed. Two elastic openings are respectively formed on the two lower side plates in the length direction, and the two elastic openings are arranged at intervals, so that the lower side plate between the two elastic openings has elasticity. Square holes are also formed on the two lower side plates in the length direction, and the square holes are located between the two elastic openings. A detection hole is also formed on the bottom plate.

[0009] Optionally, the upper cover includes a top plate and two trapezoidal blocks arranged on the top plate in the length direction. The top plate and the two trapezoidal blocks are integrally formed. The trapezoidal blocks are installed on the end wall of the top plate close to the lower side plate, and the edge of the trapezoidal block protrudes from the edge of the top plate. The edge of the trapezoidal block protruding from the top plate cooperates with the square hole.

[0010] By adopting the above technical solution, the operator controls the top plate and the bottom plate to approach each other. The inclined side wall of the trapezoidal block first abuts against the top wall of the lower side plate between the two elastic openings, and applies an outward thrust to these two lower side plates. The top end of the lower side plate elastically deforms in the direction away from each other. The top plate and the bottom plate continue to approach until the edge of the trapezoidal block is inserted into the square hole, and the lower side plate returns to its original state, and the buckling of the upper cover and the lower cover is completed.

[0011] Optionally, four connection holes are formed on the top plate, and four connectors are arranged at the bottom of the transition joint. The four connectors respectively pass through the connection holes and are connected with the circuit board assembly.

[0012] Optionally, a positioning blind hole is also formed on the top plate, and a positioning post is arranged at the bottom of the transition joint. The positioning post cooperates with the positioning blind hole.

[0013] By adopting the above technical solution, the operator first fixedly installs the circuit board assembly on the bottom wall of the top plate away from the transition joint, and then aligns the four connectors at the bottom of the transition joint with the connection holes, and at the same time aligns the positioning post with the positioning blind hole, which is convenient for positioning the transition joint. When the transition joint receives a lateral external force, the positioning post can share most of the lateral external force and reduce the possibility of connector damage.

[0014] Optionally, the seal includes a lock nut, a tapered sleeve, an expansion sleeve flange, and a locking spring. A thread is provided on the outer peripheral wall of the adapter joint. The lock nut is threadedly connected to the adapter joint. The side wall of the lock nut can abut against the outer wall of the gas meter housing. The tapered sleeve is sleeved on the adapter joint. The tapered sleeve is located on the side of the lock nut close to the upper cover. The expansion sleeve flange is disposed between the outer wall of the tapered sleeve and the inner wall of the mounting hole. A notch is provided on the expansion sleeve flange. A stepped portion is provided on the peripheral wall of the adapter joint near the upper cover. The locking spring is sleeved on the adapter joint and is disposed between the tapered sleeve and the stepped portion of the adapter joint.

[0015] Optionally, two groups of notches are provided on the expansion sleeve flange. Each notch in the same group is arranged in a circumferential array along the expansion sleeve flange. The two groups of notches are respectively located at both ends in the height direction of the expansion sleeve flange, and the two groups of notches are spaced apart.

[0016] By adopting the above technical solution, after the upper cover and the lower cover are buckled, the operator clamps the O-ring in the annular groove, sleeved the locking spring on the adapter joint, and then controls the adapter joint to pass through the mounting hole from the inside of the gas meter housing. The operator puts the expansion sleeve flange into the mounting hole from the outside of the gas meter housing, and then sleeved the tapered sleeve on the top of the adapter joint. At this time, the bottom of the tapered sleeve is plugged between the expansion sleeve flange and the adapter joint. The operator screws the lock nut onto the adapter joint and continues to control the lock nut to rotate downward. The downward movement of the lock nut pushes the tapered sleeve downward. During the downward movement of the tapered sleeve, the expansion sleeve is expanded, and the adapter joint is fixed in the mounting hole.

[0017] Optionally, an annular groove is formed on the end wall of the stepped portion of the adapter joint away from the upper cover. An O-ring is disposed in the annular groove. The O-ring protrudes from the end wall of the adapter joint. The O-ring can abut against the inner wall of the gas meter housing.

[0018] By adopting the above technical solution, when the lock nut descends relative to the adapter joint, it drives the adapter joint to move upward relative to the gas meter housing, and will be abutted against the inner wall of the gas meter housing through the O-ring, improving the sealing performance.

[0019] In summary, the present application includes at least one of the following beneficial technical effects:

[0020] When installing the pressure sensor, the operator first fixedly installs the circuit board assembly on the side wall of one side of the upper cover, then installs the adapter joint on the side wall of the other side of the upper cover, and connects the adapter joint to the circuit board assembly. At this time, the upper cover and the lower cover are buckled. The operator holds the lower cover and passes the adapter joint through the mounting hole from the inside of the gas meter housing, and then seals and fixes the adapter joint on the gas meter housing from the outside of the gas meter housing through the seal. Compared with the conventional method of adhesive connection, the stability and sealing performance of the connection between the adapter joint and the gas meter housing are improved;

[0021] The operator controls the top plate and the bottom plate to approach each other. The inclined side wall of the trapezoidal block first abuts against the top wall of the lower side plate between the two elastic openings, and applies an outward thrust to these two lower side plates. The top ends of the lower side plates elastically deform in the direction away from each other. The top plate and the bottom plate continue to approach until the edge of the trapezoidal block is inserted into the square hole, and the lower side plates recover, and the upper cover and the lower cover are buckled together to complete;

[0022] After the upper cover and the lower cover are buckled together, the operator clamps the O-ring in the annular groove, sleevs the locking spring on the transition joint, and then controls the transition joint to pass through the installation hole from inside the gas meter housing. The operator puts the expansion sleeve flange into the installation hole from outside the gas meter housing, and then sleevs the tapered sleeve on the top of the transition joint. At this time, the bottom of the tapered sleeve is plugged between the expansion sleeve flange and the transition joint. The operator screws the locking nut onto the transition joint and continues to control the locking nut to rotate and descend. The descent of the locking nut pushes the tapered sleeve to descend. During the descent of the tapered sleeve, the expansion sleeve is expanded to fix the transition joint in the installation hole. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of a pressure sensor for an NB remote transmission diaphragm gas meter according to an embodiment of the present application.

[0024] Figure 2 It is a schematic diagram of the installation relationship between the upper cover, the lower cover, the transition joint and the gas meter housing according to an embodiment of the present application.

[0025] Figure 3 It is a schematic structural diagram of the upper cover and the transition joint according to an embodiment of the present application.

[0026] Figure 4 It is a schematic structural diagram of the lower cover and the upper cover according to an embodiment of the present application.

[0027] Figure 5 It is a schematic structural diagram of the seal according to an embodiment of the present application.

[0028] Figure 6 It is a schematic structural diagram of the tapered sleeve, the expansion sleeve flange and the locking spring according to an embodiment of the present application.

[0029] Description of the reference numerals: 1. Gas meter housing; 11. Installation hole; 2. Upper cover; 21. Top plate; 22. Trapezoidal block; 23. Connection hole; 24. Positioning blind hole; 3. Lower cover; 31. Bottom plate; 32. Lower side plate; 33. Elastic opening; 34. Square hole; 35. Detection hole; 4. Transition joint; 41. Joint; 42. Positioning column; 43. Thread; 45. Annular groove; 5. Circuit board assembly; 6. Seal; 61. Locking nut; 62. Tapered sleeve; 63. Expansion sleeve flange; 64. Locking spring; 65. Notch; 7. O-ring. Detailed Embodiments

[0030] The following further elaborates on this application in conjunction with the attached drawings. Figures 1-6 A pressure sensor for an NB remote transmission diaphragm gas meter is disclosed in an embodiment of this application. Referring to

[0031] FIG. Figure 1 and Figure 2 , a pressure sensor for an NB remote transmission diaphragm gas meter includes a gas meter housing 1, and an installation hole 11 for installing the pressure sensor is provided on the gas meter housing 1. It also includes an upper cover 2 and a lower cover 3. The upper cover 2 and the lower cover 3 are buckled together to form a receiving space. A circuit board assembly 5 is arranged in the receiving space, and the circuit board assembly 5 is installed on the upper cover 2. A transition joint 4 is installed on one side of the upper cover 2 away from the lower cover 3. One end of the transition joint 4 passes through the upper cover 2 and is connected to the circuit board assembly 5. The end of the transition joint 4 away from the lower cover 3 is inserted into the installation hole 11 and protrudes from the end wall of the gas meter housing 1. A sealing member 6 is arranged between the transition joint 4 and the gas meter housing 1.

[0032] When installing the pressure sensor, the operator first fixedly installs the circuit board assembly 5 on the side wall of one side of the upper cover 2, then installs the transition joint 4 on the side wall of the other side of the upper cover 2 and connects the transition joint 4 to the circuit board assembly 5. At this time, the upper cover 2 and the lower cover 3 are buckled together. The operator holds the lower cover 3 and passes the transition joint 4 out of the gas meter housing 1 through the installation hole 11, and then seals and fixes the transition joint 4 on the gas meter housing 1 from the outside of the gas meter housing 1 through the sealing member 6. Compared with the conventional method of adhesive connection, the stability and sealing performance of the connection between the transition joint 4 and the gas meter housing 1 are improved.

[0033] Referring to Figure 3 and Figure 4 , the lower cover 3 includes a bottom plate 31 and four lower side plates 32 surrounding the bottom plate 31. The bottom plate 31 and the four lower side plates 32 are integrally formed. Two elastic openings 33 are respectively provided on two lower side plates 32 in the length direction. The elastic openings 33 extend from one-third of the height direction of the lower side plates 32 to the end wall of the lower side plates 32 away from the bottom plate 31. The two elastic openings 33 are arranged at intervals, so that the lower side plate 32 between the two elastic openings 33 has elasticity and can undergo elastic deformation. Square holes 34 are also provided on two lower side plates 32 in the length direction. The square holes 34 are located between the two elastic openings 33. A detection hole 35 is also provided on the bottom plate 31. The position of the detection hole 35 corresponds to the sensor on the circuit board assembly 5.

[0034] Referring to Figure 3 and Figure 4, the upper cover 2 includes a top plate 21 and two trapezoidal blocks 22 arranged in the length direction of the top plate 21. The top plate 21 and the two trapezoidal blocks 22 are integrally formed. The trapezoidal blocks 22 are installed on the end wall of the top plate 21 close to the lower side plate 32. The edge of the trapezoidal block 22 protrudes from the edge of the top plate 21, and the edge of the trapezoidal block 22 protruding from the top plate 21 cooperates with the square hole 34. Four connecting holes 23 are formed in the top plate 21. Four connectors 41 are arranged at the bottom of the transition joint 4. The four connectors 41 respectively pass through the connecting holes 23 and are connected to the circuit board assembly 5. A positioning blind hole 24 is also formed in the top plate 21. A positioning post 42 is arranged at the bottom of the transition joint 4. The positioning post 42 cooperates with the positioning blind hole 24.

[0035] The operator first fixedly installs the circuit board assembly 5 on the bottom wall of the top plate 21 far from the transition joint 4, and then aligns the four connectors 41 at the bottom of the transition joint 4 with the connecting holes 23, and at the same time aligns the positioning post 42 with the positioning blind hole 24, which is convenient for positioning the transition joint 4. When an external force in the lateral direction is applied to the transition joint 4, the positioning post 42 can share most of the lateral external force and reduce the possibility of damage to the connector 41. After the installation of the transition joint 4 is completed, the operator controls the top plate 21 and the bottom plate 31 to approach each other. The inclined side wall of the trapezoidal block 22 first abuts against the top wall of the lower side plate 32 between the two elastic openings 33 and applies an outward thrust to the two lower side plates 32. The top end of the lower side plate 32 elastically deforms in the direction away from each other; the top plate 21 and the bottom plate 31 continue to approach until the edge of the trapezoidal block 22 is inserted into the square hole 34, and the lower side plate 32 is restored, and the upper cover 2 and the lower cover 3 are buckled; at this time, the sensor on the circuit board assembly 5 is aligned with the detection hole 35.

[0036] Refer to Figure 5 and Figure 6 , the seal 6 includes a locking nut 61. A thread 43 is provided on the outer peripheral wall of the transition joint 4. The locking nut 61 is threadedly connected to the transition joint 4. The side wall of the locking nut 61 can abut against the outer wall of the gas meter housing 1. A tapered sleeve 62 is arranged on the side of the locking nut 61 close to the upper cover 2. The tapered sleeve 62 is sleeved on the transition joint 4. The outer diameter of the tapered sleeve 62 gradually decreases from the direction of the locking nut 61 to the direction close to the upper cover 2. There is a gap between the outer wall of the tapered sleeve 62 and the inner wall of the mounting hole 11. A expansion sleeve flange 63 is arranged between the outer wall of the tapered sleeve 62 and the inner wall of the mounting hole 11. Two groups of slits 65 are provided on the expansion sleeve flange 63. Each slit 65 in the same group is arranged in a circumferential array along the expansion sleeve flange 63. The two groups of slits 65 are respectively located at both ends in the height direction of the expansion sleeve flange 63, and the two groups of slits 65 are arranged at intervals.

[0037] A step portion is provided on the peripheral wall of the transition joint 4 near the upper cover 2. A locking spring 64 is provided between the step portion of the tapered sleeve 62 and the transition joint 4. The locking spring 64 is sleeved on the transition joint 4. One end of the locking spring 64 abuts against the bottom wall of the tapered sleeve 62, and the other end abuts against the end wall of the step portion of the transition joint 4. An annular groove 45 is formed on the end wall of the step portion of the transition joint 4 away from the upper cover 2. An O-ring 7 is provided in the annular groove 45. The O-ring 7 is a rubber ring, and the O-ring 7 is in interference fit with the annular groove 45. The O-ring 7 protrudes from the end wall of the transition joint 4, and the O-ring 7 can abut against the inner wall of the gas meter housing 1.

[0038] After the upper cover 2 and the lower cover 3 are buckled, the operator snaps the O-ring 7 into the annular groove 45, sleeved the locking spring 64 on the transition joint 4, and then controls the transition joint 4 to pass through the mounting hole 11 from the inside of the gas meter housing 1. The operator inserts the expansion sleeve flange 63 into the mounting hole 11 from the outside of the gas meter housing 1, and then sleeved the tapered sleeve 62 on the top of the transition joint 4. At this time, the bottom of the tapered sleeve 62 is plugged between the expansion sleeve flange 63 and the transition joint 4. The operator screws the locking nut 61 onto the transition joint 4 and continues to control the locking nut 61 to rotate downward. The downward movement of the locking nut 61 pushes the tapered sleeve 62 downward. During the downward movement of the tapered sleeve 62, the expansion sleeve is expanded to fix the transition joint 4 in the mounting hole 11. At the same time, when the locking nut 61 moves downward relative to the transition joint 4, it drives the transition joint 4 to move upward relative to the gas meter housing 1, and it will abut against the inner wall of the gas meter housing 1 through the O-ring to improve the sealing performance.

[0039] The implementation principle of a pressure sensor for an NB remote transmission diaphragm gas meter in an embodiment of the present application is as follows: The operator first fixedly installs the circuit board assembly 5 on the top plate 21, and then aligns the four connectors 41 at the bottom of the transition joint 4 with the connection holes 23, and at the same time aligns the positioning posts 42 with the positioning blind holes 24 to facilitate the positioning of the transition joint 4. The operator controls the top plate 21 and the bottom plate 31 to approach each other. The trapezoidal block 22 forces the tops of the two lower side plates 32 to undergo elastic deformation until the edge of the trapezoidal block 22 is inserted into the square hole 34, and the lower side plates 32 are restored, and the upper cover 2 and the lower cover 3 are buckled. Snap the O-ring into the annular groove 45, sleeved the locking spring 64 on the transition joint 4, and then control the transition joint 4 to pass through the mounting hole 11 from the inside of the gas meter housing 1. Insert the expansion sleeve flange 63 into the mounting hole 11 from the outside, and then plug the bottom of the tapered sleeve 62 between the expansion sleeve flange 63 and the transition joint 4. The operator screws the locking nut 61 onto the transition joint 4. The downward movement of the locking nut 61 pushes the tapered sleeve 62 downward. During the downward movement of the tapered sleeve 62, the expansion sleeve is expanded to fix the transition joint 4 in the mounting hole 11. At the same time, when the locking nut 61 moves downward relative to the transition joint 4, it drives the transition joint 4 to move upward relative to the gas meter housing 1, and it will abut against the inner wall of the gas meter housing 1 through the O-ring to improve the sealing performance.

[0040] The above are all preferred embodiments of this application, and the protection scope of this application is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of this application shall be covered within the protection scope of this application.

Claims

1. A pressure sensor for NB remote transmission diaphragm gas meter, characterized in that: The gas meter comprises a housing (1), an upper cover (2), a lower cover (3), a transition joint (4) and a circuit board assembly (5); the upper cover (2) and the lower cover (3) are buckled together to form a receiving space; the circuit board assembly (5) is arranged in the receiving space; the transition joint (4) is installed on a side of the upper cover (2) away from the lower cover (3); one end of the transition joint (4) passes through the upper cover (2) and is connected to the circuit board assembly (5); a mounting hole (11) is provided on the gas meter housing (1); one end of the transition joint (4) away from the lower cover (3) is inserted into the mounting hole (11) and protrudes from the end wall of the gas meter housing (1); a sealing member (6) is provided between the transition joint (4) and the gas meter housing (1).

2. The pressure sensor for NB remote transmission diaphragm gas meter according to claim 1 is characterized in that: The lower cover (3) comprises a bottom plate (31) and four lower side plates (32) surrounding the bottom plate (31), wherein the bottom plate (31) and the four lower side plates (32) are integrally formed; Two elastic openings (33) are respectively provided on the two lower side plates (32) located in the length direction, and the two elastic openings (33) are arranged at intervals so that the lower side plate (32) located between the two elastic openings (33) has elasticity; square holes (34) are also provided on the two lower side plates (32) located in the length direction, and the square holes (34) are located between the two elastic openings (33); and a detection hole (35) is also provided on the bottom plate (31).

3. The pressure sensor for NB remote transmission diaphragm gas meter according to claim 2 is characterized in that: The upper cover (2) comprises a top plate (21) and two trapezoidal blocks (22) arranged in the length direction of the top plate (21), wherein the top plate (21) and the two trapezoidal blocks (22) are integrally formed; the trapezoidal blocks (22) are mounted on the end wall of the top plate (21) close to the lower side plate (32), and the edge of the trapezoidal blocks (22) protrudes from the edge of the top plate (21), and the edge of the trapezoidal blocks (22) protruding from the top plate (21) cooperates with the square hole (34).

4. The pressure sensor for NB remote transmission diaphragm gas meter according to claim 3 is characterized in that: Four connection holes (23) are provided on the top plate (21), and four joints (41) are provided at the bottom of the transition joint (4). The four joints (41) respectively pass through the connection holes (23) to be connected to the circuit board assembly (5).

5. The pressure sensor for NB remote transmission diaphragm gas meter according to claim 3 is characterized in that: A positioning blind hole (24) is also provided on the top plate (21), and a positioning column (42) is provided at the bottom of the transition joint (4), and the positioning column (42) cooperates with the positioning blind hole (24).

6. The pressure sensor for NB remote transmission diaphragm gas meter according to claim 1 is characterized in that: The sealing member (6) comprises a locking nut (61), a cone sleeve (62), an expansion flange (63) and a locking spring (64); a thread (43) is provided on the outer peripheral wall of the transition joint (4); the locking nut (61) is connected to the thread (43) of the transition joint (4); the side wall of the locking nut (61) can abut against the outer wall of the gas meter housing (1); the cone sleeve (62) is sleeved on the transition joint (4); the cone sleeve (62) is located on a side of the locking nut (61) close to the upper cover (2); the expansion flange (63) is arranged between the outer wall of the cone sleeve (62) and the inner wall of the mounting hole (11); a notch (65) is provided on the expansion flange (63); a step portion is provided on the peripheral wall of the transition joint (4) close to the upper cover (2); the locking spring (64) is sleeved on the transition joint (4) and arranged between the cone sleeve (62) and the step portion of the transition joint (4).

7. The pressure sensor for NB remote transmission diaphragm gas meter according to claim 6 is characterized in that: Two groups of notches (65) are arranged on the expansion flange (63), and each notch (65) of the same group is arranged in a circumferential array along the expansion flange (63). The two groups of notches (65) are respectively located at two ends of the expansion flange (63) in the height direction, and the two groups of notches (65) are arranged at intervals.

8. The pressure sensor for NB remote transmission diaphragm gas meter according to claim 6 is characterized in that: An annular groove (45) is provided on the end wall of the step portion of the transition joint (4) away from the upper cover (2), an O-ring (7) is arranged in the annular groove (45), the O-ring (7) protrudes from the end wall of the transition joint (4), and the O-ring (7) can abut against the inner wall of the gas meter housing (1).

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