Tamper-proof membrane gas meter

Abstract

The utility model discloses a membrane type gas meter of anti -disassembly structure, including upper casing and lower casing, the bottom of lower casing is provided with transmission assembly, and transmission assembly includes the protection shell welded on lower casing, the inside of protection shell is provided with driving wheel, and a plurality of first follower and a plurality of second follower, the recess is provided with in one side of driving wheel, and the first follower is located between driving wheel and second follower, the inner wall of second follower is inserted with screw rod, and the outer wall of screw rod is sleeved with screw rod nut. The utility model transmission assembly's design makes casing connecting structure firm and reliable, has improved the anti -disassembly performance of gas meter greatly, effectively prevents illegal disassembly and measurement data tampering, and the thread cooperation of upper casing's thread hole and screw rod nut, and the cooperation of lower casing inner trapezoidal thread hole and screw rod nut, screw rod not only has strengthened the stability of connection, also has simplified the installation and disassembly process of gas meter and improved work efficiency.

Description

Technical Field

[0001] This utility model relates to the field of instrument manufacturing technology, specifically to a diaphragm gas meter with an anti-disassembly structure. Background Technology

[0002] As a key device for gas metering, the safety and stability of gas meters are directly related to the normal operation of the gas supply system and the safety of users' lives and property. In practical applications, the shell connection structure of traditional diaphragm gas meters mostly adopts conventional threaded connection or snap-fit ​​connection, which poses a risk of being illegally disassembled.

[0003] Someone may tamper with the metering data by disassembling the gas meter, causing inaccurate gas metering and resulting in economic losses for the gas supply company. At the same time, illegal disassembly may also damage the gas meter's sealing structure, causing gas leaks and creating serious safety hazards.

[0004] Furthermore, conventional connection structures are complex to operate during disassembly and installation, requiring various tools, which inconveniences the installation, maintenance, and repair of gas meters and reduces work efficiency. Therefore, there is an urgent need to design a reinforced connection structure for diaphragm gas meters with rock wool panels that is resistant to disassembly to solve the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a diaphragm gas meter with an anti-disassembly structure to overcome the aforementioned shortcomings in the prior art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A diaphragm gas meter with an anti-disassembly structure includes an upper housing and a lower housing. A transmission assembly is provided at the bottom of the lower housing. The transmission assembly includes a protective shell welded to the lower housing. The protective shell has a drive wheel, a plurality of first driven wheels, and a plurality of second driven wheels inside. A groove is provided on one side of the drive wheel. The first driven wheels are located between the drive wheel and the second driven wheels.

[0008] A lead screw is inserted into the inner wall of the second driven wheel, and a lead screw nut is sleeved on the outer wall of the lead screw.

[0009] Preferably, a connecting pipe is provided at the top of the upper housing, and a display is provided on one side of the upper housing.

[0010] Preferably, the bottom periphery of the upper housing is provided with a plurality of threaded holes, which are threadedly engaged with the lead screw nut.

[0011] Preferably, the inner wall of the lower housing is provided with a trapezoidal threaded hole, the larger hole of the trapezoidal threaded hole is threadedly engaged with the lead screw nut, and the smaller hole of the trapezoidal threaded hole is threadedly engaged with the lead screw.

[0012] Preferably, a driving component is provided on one side of the groove, the driving component including a protrusion sleeved inside the groove, and a handle is provided on one side of the protrusion.

[0013] Preferably, the transmission ratio of the driving wheel, the first driven wheel, and the second driven wheel is 3:2:1, and the lead screw nut can be accurately rotated from the trapezoidal threaded hole of the lower housing to the threaded hole of the upper housing when the driving wheel rotates one revolution.

[0014] Preferably, the teeth of the driving wheel, the first driven wheel, and the second driven wheel are all involute teeth with a module of 1.5-2.0 and a pressure angle of 20°.

[0015] Preferably, the outer surface of the lead screw nut is provided with a guide slope, the inclination angle of which is 15°-20°. When the lead screw nut is rotated from the trapezoidal threaded hole into the threaded hole of the upper housing, the guide slope can guide the lead screw nut to accurately enter the threaded hole.

[0016] In the above technical solution, the diaphragm gas meter with an anti-disassembly structure provided by this utility model has the following beneficial effects:

[0017] (1) The transmission component design realizes the tight connection between the upper and lower housings, the transmission cooperation of the driving wheel, the first driven wheel and the second driven wheel, and the threaded transmission of the lead screw and lead screw nut, which makes the housing connection structure firm and reliable, greatly improves the anti-disassembly performance of the gas meter, effectively prevents illegal disassembly and tampering of metering data, and protects the interests of gas supply companies and users.

[0018] (2) The threaded hole of the upper housing and the threaded engagement of the screw nut, as well as the engagement of the trapezoidal threaded hole of the lower housing with the screw nut and the screw, not only enhance the stability of the connection, but also simplify the installation and disassembly process of the gas meter. When the gas meter needs to be maintained and repaired, the housing can be separated by rotating the drive wheel through the drive component without the need for complicated tools, which improves work efficiency. After installation, the drive component can be removed. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is a three-dimensional structural view of an embodiment of a diaphragm gas meter with an anti-disassembly structure according to the present invention.

[0021] Figure 2This is a cross-sectional view of the upper housing structure of an embodiment of a diaphragm gas meter with an anti-disassembly structure according to the present invention.

[0022] Figure 3 This is a perspective view of the drive assembly structure provided in an embodiment of a diaphragm gas meter with an anti-disassembly structure according to the present invention.

[0023] Figure 4 This is a perspective view of the transmission component structure provided in an embodiment of a diaphragm gas meter with an anti-disassembly structure according to the present invention.

[0024] 1. Upper housing; 2. Connecting pipe; 3. Display; 4. Lower housing; 5. Transmission assembly; 51. Protective shell; 52. Groove; 53. Drive wheel; 54. First driven wheel; 55. Second driven wheel; 56. Lead screw; 57. Lead screw nut; 6. Threaded hole; 7. Drive assembly; 71. Protrusion; 72. Handle; 8. Trapezoidal threaded hole. Detailed Implementation

[0025] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0026] like Figure 1-4 As shown in the figure, the diaphragm gas meter with an anti-disassembly structure provided by this utility model includes an upper housing 1 and a lower housing 4. A transmission assembly 5 is provided at the bottom of the lower housing 4. The transmission assembly 5 includes a protective shell 51 welded to the lower housing 4. The protective shell 51 is provided with a drive wheel 53, a plurality of first driven wheels 54 and a plurality of second driven wheels 55 inside. A groove 52 is provided on one side of the drive wheel 53. The first driven wheels 54 are located between the drive wheel 53 and the second driven wheels 55. A lead screw 56 is inserted into the inner wall of the second driven wheel 55, and a lead screw nut 57 is sleeved on the outer wall of the lead screw 56.

[0027] In this embodiment, there are an upper shell 1 and a lower shell 4. The upper shell 1 and the lower shell 4 are box-shaped structures and together form the main frame of the device. A transmission component 5 is provided at the bottom of the lower shell 4. The transmission component 5 is fixedly installed in the central area of ​​the bottom of the lower shell 4. This component is the core component for realizing the connection between the upper and lower shells.

[0028] The transmission assembly 5 includes a protective shell 51 welded to the lower housing 4. The protective shell 51 is cuboid in shape and is firmly welded to the central area of ​​the bottom of the lower housing 4 by a full welding process to form a closed protective space for protecting the internal transmission components.

[0029] The protective shell 51 is provided with a drive wheel 53, a number of first driven wheels 54 and a number of second driven wheels 55. The drive wheel 53 is located in the middle of the protective shell 51, and one side of it is rotatably connected to the lower shell 4. One side of the drive wheel 53 is provided with a groove 52, and the other side is fixedly connected to the groove 52. The bottom of the protective shell 51 is provided with a through hole, which is located at the top of the groove 52. The groove 52 is used to cooperate with the drive assembly 7 to realize power input.

[0030] The first driven wheel 54 is located between the driving wheel 53 and the second driven wheel 55. The first driven wheel 54 is evenly distributed and located between the driving wheel 53 and the second driven wheel 55, playing the role of intermediate transmission and speed increase. The second driven wheel 55 is distributed at the four corners of the protective shell 51.

[0031] A lead screw 56 is inserted into the inner wall of the second driven wheel 55. A through hole is opened at the center of each second driven wheel 55. The lead screw 56 passes vertically through the through hole and is fixedly inserted into the inner wall of the second driven wheel 55 by interference fit, so as to ensure that the lead screw 56 and the second driven wheel 55 rotate synchronously.

[0032] A screw nut 57 is sleeved on the outer wall of the screw 56. The screw nut 57 is sleeved on the screw 56 by means of thread engagement and can move linearly along the axial direction of the screw 56.

[0033] Specifically, a connecting pipe 2 is provided on the top of the upper housing 1. The upper housing 1 has a box-shaped structure with an open top, and the connecting pipe 2 is vertically welded at the center of its top. The connecting pipe 2 is used to connect to other pipes.

[0034] A display 3 is provided on one side of the upper housing 1. The display 3 is embedded on the front surface of the upper housing 1 to display information such as device operating parameters and usage status.

[0035] Specifically, the bottom periphery of the upper housing 1 is provided with several threaded holes 6, which are threadedly engaged with the lead screw nut 57.

[0036] Furthermore, the inner wall of the lower housing 4 is provided with a trapezoidal threaded hole 8, and at the bottom edge of the upper housing 1, a number of threaded holes 6 are evenly distributed along the circumferential direction. These threaded holes 6 are matched with the external thread of the lead screw nut 57.

[0037] The large hole of the trapezoidal threaded hole 8 is threaded with the lead screw nut 57, and the small hole of the trapezoidal threaded hole 8 is threaded with the lead screw 56. On the inner wall of the lower housing 4, trapezoidal threaded holes 8 are provided corresponding to the position of each lead screw 56. The trapezoidal threaded holes 8 are stepped, with the large hole part cooperating with the external thread of the lead screw nut 57 and the small hole part cooperating with the external thread of the lead screw 56. This design allows the lead screw nut 57 to smoothly transition between the trapezoidal threaded hole 8 and the threaded hole 6 during the movement.

[0038] Furthermore, a drive assembly 7 is provided on one side of the groove 52. The drive assembly 7 includes a protrusion 71 that is fitted inside the groove 52. The protrusion 71 is cylindrical and its outer diameter matches the inner diameter of the groove 52 of the drive wheel 53. It is fitted inside the groove 52 through a clearance fit, so that the protrusion 71 can rotate flexibly inside the groove 52.

[0039] A handle 72 is provided on one side of the groove 71. The handle 72 is vertically welded to one side of the groove 71. The operator can rotate the groove 71 by holding the handle 72 and turning it, thereby driving the drive wheel 53 to rotate.

[0040] Furthermore, the transmission ratio of the driving wheel 53, the first driven wheel 54, and the second driven wheel 55 is 3:2:1. When the driving wheel 53 rotates one revolution, the lead screw nut 57 can accurately rotate from the trapezoidal threaded hole 8 of the lower housing 4 to the threaded hole 6 of the upper housing 1.

[0041] When the operator turns handle 72 to drive the drive wheel 53 to rotate, power is synchronously transmitted through the involute gear pair to the four evenly distributed first driven wheels 54. Due to the 3:2:1 transmission ratio design, each first driven wheel 54 drives the corresponding second driven wheel 55 to rotate at an increased speed, causing the four lead screws 56 to rotate synchronously. At this time, the four lead screw nuts 57, which are threaded into the lead screws 56, move synchronously in a linear motion, moving upward from the trapezoidal threaded hole 8 in the lower housing 4.

[0042] Furthermore, the teeth of the driving wheel 53, the first driven wheel 54, and the second driven wheel 55 are all involute teeth with a module of 1.5-2.0 and a pressure angle of 20°.

[0043] Each transmission wheel adopts an involute tooth design with a module set between 1.5 and 2.0 and a pressure angle of 20°. This tooth design can ensure the smoothness, accuracy and high transmission efficiency of the transmission process, and effectively reduce the impact and noise during the transmission process.

[0044] It should be noted that the outer surface of the lead screw nut 57 is provided with a guide slope with an inclination angle of 15°-20°. When the lead screw nut 57 is rotated from the trapezoidal threaded hole 8 into the threaded hole 6 of the upper housing 1, the guide slope can guide the lead screw nut 57 to accurately enter the threaded hole 6.

[0045] As the screw approaches the upper housing 1, the 15°-20° guide slope on the outer surface of the lead screw nut 57 first contacts the chamfer at the entrance of the threaded hole 6. As the lead screw 56 continues to rotate, the radial component force generated by the guide slope automatically corrects minor installation deviations, enabling the four lead screw nuts 57 to achieve synchronous automatic alignment with their corresponding threaded holes 6.

[0046] Working steps: 1. Place the lower housing 4 horizontally on the mounting surface, align the upper housing 1 with the lower housing 4, and align the threaded hole 6 at the bottom of the upper housing 1 with the trapezoidal threaded hole 8 on the inner wall of the lower housing 4.

[0047] 2. Fit the protrusion 71 of the drive assembly 7 into the groove 52 of the drive wheel 53, and rotate the drive wheel 53 by turning the handle 72;

[0048] 3. The driving wheel 53 synchronously drives the four first driven wheels 54 and the four second driven wheels 55 to rotate. When the four sets of second driven wheels 55 rotate, they drive the lead screw nut 57 to move upward along the lead screw 56.

[0049] Fourth, the lead screw nut 57 first engages with the trapezoidal threaded hole 8 in the lower housing 4. As it rotates continuously, it gradually rotates into the threaded hole 6 in the upper housing 1 until all four sets of lead screw nuts 57 are fully embedded, thus achieving a tight and stable connection between the upper housing 1 and the lower housing 4. After installation, the drive assembly 7 can be removed.

[0050] 5. During disassembly, once again fit the protrusion 71 of the drive assembly 7 into the groove 52 of the drive wheel 53;

[0051] 6. Reverse rotation of handle 72 drives the driving wheel 53, the four first driven wheels 54, and the four second driven wheels 55 to rotate in the opposite direction, causing the four sets of lead screw nuts 57 to gradually disengage from the threaded holes 6 of the upper housing 1 and move downwards along the lead screw 56. This continues until all four sets of lead screw nuts 57 are completely disengaged from the threaded holes 6 of the upper housing 1. At this point, the upper housing 1 can be separated from the lower housing 4, completing the disassembly.

[0052] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A diaphragm gas meter with an anti-disassembly structure, comprising an upper housing (1) and a lower housing (4), characterized in that, The bottom of the lower housing (4) is provided with a transmission assembly (5). The transmission assembly (5) includes a protective shell (51) welded to the lower housing (4). The protective shell (51) is provided with a drive wheel (53), a number of first driven wheels (54) and a number of second driven wheels (55) inside. A groove (52) is provided on one side of the drive wheel (53). The first driven wheels (54) are located between the drive wheel (53) and the second driven wheels (55). A lead screw (56) is inserted into the inner wall of the second driven wheel (55), and a lead screw nut (57) is sleeved on the outer wall of the lead screw (56).

2. The diaphragm gas meter with an anti-disassembly structure according to claim 1, characterized in that, A connecting pipe (2) is provided on the top of the upper housing (1), and a display (3) is provided on one side of the upper housing (1).

3. The diaphragm gas meter with an anti-disassembly structure according to claim 2, characterized in that, The bottom periphery of the upper housing (1) is provided with a number of threaded holes (6), which are threadedly engaged with the lead screw nut (57).

4. A diaphragm gas meter with an anti-disassembly structure according to claim 3, characterized in that, The inner wall of the lower housing (4) is provided with a trapezoidal threaded hole (8). The large hole of the trapezoidal threaded hole (8) is threadedly engaged with the lead screw nut (57), and the small hole of the trapezoidal threaded hole (8) is threadedly engaged with the lead screw (56).

5. A diaphragm gas meter with an anti-disassembly structure according to claim 4, characterized in that, A drive assembly (7) is provided on one side of the groove (52). The drive assembly (7) includes a protrusion (71) sleeved inside the groove (52). A handle (72) is provided on one side of the protrusion (71).

6. A diaphragm gas meter with an anti-disassembly structure according to claim 5, characterized in that, The transmission ratio of the driving wheel (53), the first driven wheel (54), and the second driven wheel (55) is 3:2:

1. When the driving wheel (53) rotates one revolution, the lead screw nut (57) can accurately rotate from the trapezoidal threaded hole (8) of the lower housing (4) to the threaded hole (6) of the upper housing (1).

7. A diaphragm gas meter with an anti-disassembly structure according to claim 6, characterized in that, The teeth of the driving wheel (53), the first driven wheel (54), and the second driven wheel (55) are all involute teeth with a module of 1.5-2.0 and a pressure angle of 20°.

8. A diaphragm gas meter with an anti-disassembly structure according to claim 7, characterized in that, The outer surface of the lead screw nut (57) is provided with a guide slope with an inclination angle of 15°-20°. When the lead screw nut (57) rotates from the trapezoidal threaded hole (8) into the threaded hole (6) of the upper housing (1), the guide slope can guide the lead screw nut (57) to accurately enter the threaded hole (6).

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