A gas meter with a concealed diaphragm

Abstract

The application discloses a kind of invisible film type gas meter, belongs to gas flow measurement equipment technical field, including gas meter shell, the gas meter movement of being installed in gas meter shell, with the central shaft being connected with gas meter movement, still be installed with counter in gas meter shell, central shaft is connected to counter by lubricating assembly, the surface of input shaft is provided with the limit slot of being slidably matched with limit block, limit slot extends along the axial direction of input shaft;Tail end of limit slot is provided with push plate, push plate is slidably arranged in the sliding cavity of being opened in input shaft, push plate is connected to piston by shaft rod, first spring is connected between push plate and the inner wall of sliding cavity, piston is slidably arranged in the oil storage cavity of being opened in input shaft, oil storage cavity is filled with sponge, the inside of sponge is filled with lubricating oil, tail end of input shaft is provided with oil outlet hole being communicated with oil storage cavity.The application can lubricate the internal structure of the counter of gas meter when it is enabled, to reduce the friction resistance of device, improve the life of device.

Description

Technical Field

[0001] This invention belongs to the technical field of gas flow measurement equipment, specifically relating to an invisible diaphragm gas meter. Background Technology

[0002] When flowing gas passes through a gas meter, the friction from the pipes and the obstruction of the mechanism create a pressure difference between the inlet and outlet of the gas meter. This pressure difference drives the diaphragm of the diaphragm gas meter to move within the metering chamber, and also drives the gas distribution mechanism to coordinate the gas distribution, allowing the diaphragm to move continuously and reciprocally. The diaphragm gas meter uses its internal mechanical structure to convert linear reciprocating motion into circular motion, which in turn drives the mechanical roller counter to rotate. Each time the diaphragm reciprocates, a certain amount of gas is discharged. Finally, the roller rotates through one counting unit, achieving the metering and display effect. Existing mechanical concealed diaphragm gas meters typically hide the counter inside the casing. After the counter reaches a certain service life, the internal gear structure of the counter, due to prolonged lack of lubrication, will affect the accuracy and lifespan of the device. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide an invisible diaphragm gas meter that can lubricate its internal structure when the gas meter counter is activated, so as to reduce the frictional resistance of the device and improve the life of the device.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] This invention discloses a concealed diaphragm gas meter, comprising a gas meter housing, a gas meter movement installed within the gas meter housing, and a central shaft connected to the gas meter movement. A counter is also installed within the gas meter housing. The central shaft is connected to the counter via a lubrication assembly. The lubrication assembly includes a sleeve and a transmission assembly for driving the sleeve to rotate. The inner side of the sleeve is provided with a threaded section and a smooth section. The threaded section is threadedly engaged with a threaded shaft fixed within the housing, and the smooth section is slidably engaged with the input shaft of the counter. A limit block is fixed to the inner side of the smooth section. The input shaft has a limiting groove on its surface that slides with the limiting block, and the limiting groove extends along the axial direction of the input shaft. A push plate is provided at the tail end of the limiting groove. The push plate is slidably disposed in a sliding cavity opened inside the input shaft. The push plate is connected to the piston through a shaft. A first spring is connected between the push plate and the inner wall of the sliding cavity. The piston is slidably disposed in an oil storage cavity opened inside the input shaft. The oil storage cavity is filled with a sponge, and the sponge is filled with lubricating oil. An oil outlet is provided at the tail end of the input shaft that communicates with the oil storage cavity.

[0006] Furthermore, a gear ring is provided on the outer side of the sleeve; the transmission assembly includes a central gear, a transmission gear, a transmission shaft, a transmission shaft support, a universal coupling, an inner rod, an outer rod, a second spring, and a meshing gear. The central gear is coaxially connected to the central shaft, the transmission gear meshes with the central gear, the transmission shaft is coaxially connected to the transmission gear, the transmission shaft is mounted on the gas meter housing via the transmission shaft support, one end of the transmission shaft is connected to the inner rod via a universal coupling, the outer rod is slidably disposed on the outer side of the inner rod, the second spring is disposed inside the outer rod to connect the outer rod and the inner rod, the outer end of the outer rod is fixedly connected to the meshing gear, and the meshing gear meshes with the gear ring.

[0007] Furthermore, two limiting plates are fixed at intervals on the outer side of the sleeve, and the toothed ring is located between the two limiting plates.

[0008] Furthermore, the transmission assembly consists of two sets, which are spaced apart on the upper and lower sides of the threaded shaft. The inner rods of the two sets of transmission assemblies are respectively rotatably connected to a first slider and a second slider. The first slider and the second slider are simultaneously slidably engaged with a guide rod. The guide rod is fixedly connected to the gas meter housing. The first slider and the second slider are simultaneously threadedly connected to a screw. The threaded holes on the first slider and the second slider have opposite directions of rotation. The screw is rotatably connected to the gas meter housing.

[0009] Furthermore, a fixing block is fixed in the middle of the guide rod, and the threaded shaft is connected to the guide rod through the fixing block. A through hole is provided on the fixing block for the screw to pass through.

[0010] Furthermore, one end of the screw extending out of the housing is connected to a first bevel gear, which meshes with a second bevel gear. The second bevel gear is coaxially connected to a horizontally arranged transmission rod, which is mounted on the top of the housing via a bearing seat.

[0011] Furthermore, a pin is fixed to the outer side of the inner rod, and an opening groove that mates with the pin is opened on the outer side of the outer rod, the opening groove extending along the axial direction of the outer rod.

[0012] Furthermore, the inner side of the input shaft is provided with a shaft hole that slides with the shaft rod, and a sealing ring is installed between the inner wall of the shaft hole and the shaft rod.

[0013] Furthermore, a ratchet is coaxially connected to the outside of the input shaft, a mounting plate is fixed to the outside of the counter, the ratchet engages with a pawl, the pawl is rotatably connected to a rotating shaft, and a reset torsion spring is installed between the pawl and the mounting plate.

[0014] The beneficial effects of this invention are as follows:

[0015] This invention discloses a concealed diaphragm gas meter. In use, the central shaft drives a sleeve to rotate via a transmission assembly. The sleeve rotates and moves axially in conjunction with a threaded shaft, and a counter records the movement. When the sleeve moves to the point where a limit block contacts a push plate and separates from the threaded shaft, the push plate drives a piston to compress the lubricating oil within the sponge, thus lubricating the counter's internal components. This invention lubricates the internal structure of the gas meter when the counter is activated, reducing frictional resistance and extending the device's lifespan.

[0016] In the device disclosed in this invention, by setting a sleeve with both a threaded section and a smooth rod section, not only can the rotational motion be transmitted to the input shaft in a timely manner, but it can also disengage from the threaded shaft promptly after contacting the push plate, avoiding interference with the counter's housing after excessive displacement, thus serving as a mechanical trigger. Using this invention's device for automatic oil dispensing results in more stable device operation.

[0017] Other advantages, objectives, and features of the invention will be set forth in the following description and will be apparent to those skilled in the art in some respects, or may be learned by practice of the invention. The objectives and other advantages of the invention can be realized and obtained through the following description. Attached Figure Description

[0018] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration:

[0019] Figure 1 This is a schematic diagram of the gas meter of the present invention;

[0020] Figure 2 This is a front view of the gas meter of the present invention;

[0021] Figure 3 This is a schematic diagram of the lubrication assembly.

[0022] Figure 4 for Figure 3 Enlarged view at point A;

[0023] Figure 5 A schematic diagram of the inner and outer rods;

[0024] Figure 6 This is a schematic diagram of the input shaft.

[0025] The components in the attached diagram are labeled as follows: 1. Gas meter housing; 2. Gas meter movement; 3. Central shaft; 4. Counter; 5. Sleeve; 6. Threaded section; 7. Polished rod section; 8. Threaded shaft; 9. Input shaft; 10. Limiting block; 11. Limiting groove; 12. Push plate; 13. Sliding cavity; 14. Shaft; 15. Piston; 16. First spring; 17. Oil storage cavity; 18. Sponge; 19. Oil outlet hole; 20. Gear ring; 21. Central gear; 22. Transmission gear; 23. Transmission shaft; 24. Transmission shaft support. Universal coupling 25, inner rod 26, outer rod 27, second spring 28, meshing gear 29, limiting plate 30, first slider 31, second slider 32, guide rod 33, screw 34, fixing block 35, first bevel gear 36, second bevel gear 37, transmission rod 38, bearing seat 39, pin 40, opening groove 41, shaft hole 42, sealing ring 43, ratchet 44, mounting plate 45, pawl 46, rotating shaft 47, return torsion spring 48. Detailed Implementation

[0026] like Figures 1 to 6 As shown, this invention discloses an invisible diaphragm gas meter, comprising a gas meter housing 1, a gas meter movement 2 installed within the gas meter housing 1, and a central shaft 3 connected to the gas meter movement 2. A counter 4 is also installed within the gas meter housing 1, and the central shaft 3 is connected to the counter 4 via a lubrication assembly. The gas meter movement 2 of this invention is prior art. The movement of the diaphragm assembly within the movement drives a linkage mechanism via a rocker arm, causing the valve cover to rotate and thus controlling the sequential filling and venting of each metering chamber, enabling the gas meter to continuously cycle. Simultaneously, the eccentric rotating gear of the linkage mechanism drives the central shaft 3 to rotate via gear transmission. The relevant technical principles are prior art and should be understood by those skilled in the art.

[0027] Unlike existing technologies, the lubrication assembly in this invention includes a sleeve 5 and a transmission assembly that drives the sleeve 5 to rotate. The sleeve 5 is coaxial with the input shaft 9 of the counter 4. The inner side of the sleeve 5 is provided with a threaded section 6 and a smooth section 7. The gas meter movement 2 and the counter 4 are located on opposite sides inside the gas meter housing 1. The threaded section 6 faces the side where the gas meter movement 2 is located, and the smooth section 7 faces the side where the counter 4 is located. The threaded section 6 is threadedly engaged with a threaded shaft 8 fixed inside the housing, and the smooth section 7 is slidably engaged with the input shaft 9 of the counter 4. A limit block 10 is fixed on the inner side of the smooth section 7, and a limit groove 11 is formed on the surface of the input shaft 9, which is slidably engaged with the limit block 10. The limit groove 11 extends along the axial direction of the input shaft 9. Through the limiting action of the limit block 10 and the limit groove 11, the synchronous rotation of the sleeve 5 and the input shaft 9 can be achieved.

[0028] Specifically, in this embodiment of the invention, a push plate 12 is provided at the tail end of the limiting groove 11. The push plate 12 is slidably disposed in the sliding cavity 13 opened in the input shaft 9. The push plate 12 can slide along the axial direction of the input shaft 9. The upper side of the push plate 12 extends to the limiting groove 11. When the limiting block 10 moves to the rear end of the limiting groove 11, it can contact the push plate 12 and drive the push plate 12 to move. The push plate 12 is connected to the piston 15 through the shaft 14. A first spring 16 is connected between the push plate 12 and the inner wall of the sliding cavity 13. The piston 15 is slidably disposed in the oil storage cavity 17 opened in the input shaft 9. The oil storage cavity 17 is filled with a sponge 18, which is filled with lubricating oil. An oil outlet hole 19 communicating with the oil storage cavity 17 is opened at the tail end of the input shaft 9. When the displacement reaches the point where the limiting block 10 contacts the push plate 12 until the sleeve 5 separates from the threaded shaft 8, the push plate 12 can drive the piston 15 to compress the lubricating oil in the sponge 18, thereby achieving lubrication of the inside of the counter 4. The device of this invention can lubricate the internal structure of the gas meter when the counter 4 is activated, thereby reducing the frictional resistance of the device and improving its lifespan.

[0029] In this invention, lubricating oil can be added using only one power source via the central shaft 3, reducing the number of power sources and saving energy. Furthermore, lubricating oil addition is only initiated when the device is started, further minimizing energy waste. Lubricating oil can be added in real-time according to actual device startup needs, resulting in more stable device operation.

[0030] In this embodiment, a gear ring 20 is provided on the outer side of the sleeve 5; the gear ring 20 is coaxially arranged with the sleeve 5. The transmission assembly includes a central gear 21, a transmission gear 22, a transmission shaft 23, a transmission shaft support 24, a universal coupling 25, an inner rod 26, an outer rod 27, a second spring 28, and a meshing gear 29. The central gear 21 is coaxially connected to the central shaft 3, the transmission gear 22 meshes with the central gear 21, the transmission shaft 23 is coaxially connected with the transmission gear 22, the transmission shaft 23 is installed on the gas meter housing 1 through the transmission shaft support 24, one end of the transmission shaft 23 is connected to the inner rod 26 through a universal coupling shaft, the outer rod 27 is slidably arranged on the outer side of the inner rod 26, the second spring 28 is arranged inside the outer rod 27 to connect the outer rod 27 and the inner rod 26, the outer end of the outer rod 27 is fixedly connected to the meshing gear 29, and the meshing gear 29 meshes with the gear ring 20. In practical use, the central shaft 3 drives the central gear 21 to rotate, which in turn drives the transmission gear 22 meshing with it. The transmission gear 22, through the transmission shaft 23, drives the inner rod 26, which in turn drives the outer rod 27 and the meshing gear 29 connected to it to rotate. The meshing gear 29 then drives the gear ring 20 to rotate, thereby achieving counting. By adopting the above structure, the torque of the central shaft 3 can be transmitted to the gear ring 20 in a timely manner.

[0031] In this embodiment, two limiting plates 30 are fixedly spaced apart on the outer side of the sleeve 5. The outer diameter of the gear ring 20 is smaller than the diameter of the limiting plates 30, and the gear ring 20 is located between the two limiting plates 30. When the meshing gear 29 moves axially, the limiting plates 30 can also limit the movement of the sleeve 5 axially, facilitating the subsequent action of the limiting block 10 on the push plate 12. When the device stops functioning, the second spring 28 can drive the meshing gear 29 and the sleeve 5 back to their original positions, facilitating the normal operation of the device in the next cycle.

[0032] In this embodiment, there are two sets of transmission components, which are spaced apart on the upper and lower sides of the threaded shaft 8. The inner rods 26 of the two sets of transmission components are rotatably connected to the first slider 31 and the second slider 32, respectively. The first slider 31 and the second slider 32 are simultaneously slidably engaged with a guide rod 33, which is fixedly connected to the gas meter housing 1. The first slider 31 and the second slider 32 are simultaneously threadedly connected to the screw 34. The threaded holes on the first slider 31 and the second slider 32 have opposite directions of rotation. The screw 34 is rotatably connected to the gas meter housing 1. By setting two sets of transmission components, the offset of the input shaft 9 is reduced, making the movement of the sleeve 5 more stable. The rotation of the screw 34 is manually controlled. When the screw 34 is rotated, it can drive the two first sliders 31 and the second slider 32 with different thread directions to move in the same or opposite directions, thereby realizing the meshing or disengagement between the meshing gear 29 and the gear ring 20. This can serve as a manual control function for opening and closing the device, which can facilitate the maintenance or repair of the device.

[0033] In this embodiment, a fixing block 35 is fixed to the middle of the guide rod 33, and the threaded shaft 8 is connected to the guide rod 33 through the fixing block 35. The fixing block 35 has a through hole for the screw 34 to pass through. By setting the fixing block 35, the threaded shaft 8 can be fixed, and the through hole on the fixing block 35 allows the screw 34 to pass through, avoiding interference. The fixing block 35 also serves as a limit, preventing excessive displacement of the meshing gear 29 and interference between it and the gear ring 20.

[0034] In this embodiment, the end of the screw 34 extending out of the housing is connected to a first bevel gear 36. The first bevel gear 36 meshes with a second bevel gear 37. The second bevel gear 37 is coaxially connected to a horizontally arranged transmission rod 38. The transmission rod 38 is mounted on the top of the housing via a bearing seat 39. By setting up the above structure, the control of the screw 34 can be transferred to the top of the gas meter housing 1, facilitating manual operation of the screw 34's rotation. Manual operation is more convenient.

[0035] In this embodiment, a pin 40 is fixed to the outer side of the inner rod 26, and an opening groove 41 that mates with the pin 40 is provided on the outer side of the outer rod 27. The opening groove 41 extends along the axial direction of the outer rod 27. The engagement of the pin 40 and the opening groove 41 restricts relative rotation between the inner rod 26 and the outer rod 27, while ensuring that they do not affect each other axially. This allows the outer rod 27 to move axially relative to the inner rod 26. The outer rod 27 can also accommodate the second spring 28, making the entire device more compact.

[0036] In this embodiment, the inner side of the input shaft 9 is provided with a shaft hole 42 that slides with the shaft rod 14. A sealing ring 43 is installed between the inner wall of the shaft hole 42 and the shaft rod 14, which can be used to seal the shaft rod 14 and prevent lubricating oil leakage.

[0037] In this embodiment, a ratchet 44 is coaxially connected to the outer side of the input shaft 9, and a mounting plate 45 is fixed to the outer side of the counter 4. The ratchet 44 engages with a pawl 46, which is rotatably connected to a rotating shaft 47. A return torsion spring 48 is installed between the pawl 46 and the mounting plate 45. By installing the ratchet 44 on the input shaft 9, the unidirectional rotation of the input shaft 9 can be controlled, preventing reverse rotation and thus improving the accuracy of counting. The return torsion spring 48 provides elastic torsional force to the pawl 46, allowing the tip of the pawl 46 to fit tightly against the outer side of the ratchet 44 for a more stable engagement.

[0038] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made to it in form and detail without departing from the scope defined by the claims of the present invention.

Claims

1. A concealed diaphragm gas meter, comprising a gas meter housing (1), a gas meter movement (2) installed inside the gas meter housing (1), and a central shaft (3) connected to the gas meter movement (2), wherein a counter (4) is also installed inside the gas meter housing (1), and the central shaft (3) is connected to the counter (4) via a lubrication assembly, characterized in that: The lubrication assembly includes a sleeve (5) and a transmission assembly for driving the sleeve (5) to rotate. The inner side of the sleeve (5) is provided with a threaded section (6) and a smooth rod section (7). The threaded section (6) is threadedly engaged with a threaded shaft (8) fixed inside the housing. The smooth rod section (7) is slidably engaged with the input shaft (9) of the counter (4). A limit block (10) is fixed to the inner side of the smooth rod section (7). A limit groove (11) is formed on the surface of the input shaft (9) and slidably engages with the limit block (10). The limit groove (11) extends along the axial direction of the input shaft (9). A push plate (12) is provided at the tail end of the groove (11). The push plate (12) is slidably disposed in a sliding cavity (13) opened in the input shaft (9). The push plate (12) is connected to the piston (15) through a shaft (14). A first spring (16) is connected between the push plate (12) and the inner wall of the sliding cavity (13). The piston (15) is slidably disposed in an oil storage cavity (17) opened in the input shaft (9). The oil storage cavity (17) is filled with a sponge (18) and the sponge (18) is filled with lubricating oil. A connection is provided at the tail end of the input shaft (9) to the oil storage cavity (17). The sleeve (5) has an oil outlet (19); a gear ring (20) is provided on the outer side of the sleeve (5); the transmission assembly includes a central gear (21), a transmission gear (22), a transmission shaft (23), a transmission shaft support (24), a universal coupling (25), an inner rod (26), an outer rod (27), a second spring (28), and a meshing gear (29). The central gear (21) is coaxially connected to the central shaft (3), the transmission gear (22) meshes with the central gear (21), the transmission shaft (23) is coaxially connected to the transmission gear (22), and the transmission shaft (23) is supported by a transmission shaft support. The seat (24) is installed on the gas meter housing (1). One end of the drive shaft (23) is connected to the inner rod (26) through a universal joint. The outer rod (27) is slidably disposed on the outside of the inner rod (26). The second spring (28) is disposed inside the outer rod (27) to connect the outer rod (27) and the inner rod (26). The outer end of the outer rod (27) is fixedly connected to the meshing gear (29). The meshing gear (29) meshes with the gear ring (20). Two limiting plates (30) are fixedly spaced apart on the outside of the sleeve (5). The gear ring (20) is located between the two limiting plates (30).

2. The concealed diaphragm gas meter according to claim 1, characterized in that: The transmission components consist of two sets, which are arranged on the upper and lower sides of the threaded shaft (8) at intervals. The inner rods (26) of the two sets of transmission components are respectively rotatably connected to the first slider (31) and the second slider (32). The first slider (31) and the second slider (32) are simultaneously slidably engaged with a guide rod (33). The guide rod (33) is fixedly connected to the gas meter housing (1). The first slider (31) and the second slider (32) are simultaneously threadedly connected to the screw (34). The threaded holes on the first slider (31) and the second slider (32) have opposite rotation directions. The screw (34) is rotatably connected to the gas meter housing (1).

3. The concealed diaphragm gas meter according to claim 2, characterized in that: A fixing block (35) is fixed in the middle of the guide rod (33), and the threaded shaft (8) is connected to the guide rod (33) through the fixing block (35). A through hole is provided on the fixing block (35) for the screw (34) to pass through.

4. The concealed diaphragm gas meter according to claim 2, characterized in that: The screw (34) extends out of the housing and is connected to the first bevel gear (36). The first bevel gear (36) meshes with the second bevel gear (37). The second bevel gear (37) is coaxially connected to a horizontally arranged transmission rod (38). The transmission rod (38) is mounted on the top of the housing through a bearing seat (39).

5. A concealed diaphragm gas meter according to claim 1, characterized in that: The inner rod (26) is fixed with a pin (40) on its outer side, and the outer rod (27) is provided with an opening groove (41) that mates with the pin (40) on its outer side. The opening groove (41) extends along the axial direction of the outer rod (27).

6. The concealed diaphragm gas meter according to claim 1, characterized in that: The input shaft (9) has a shaft hole (42) that slides with the shaft rod (14) on its inner side, and a sealing ring (43) is installed between the inner wall of the shaft hole (42) and the shaft rod (14).

7. A concealed diaphragm gas meter according to any one of claims 1-6, characterized in that: A ratchet (44) is coaxially connected to the outside of the input shaft (9), and a mounting plate (45) is fixed to the outside of the counter (4). The ratchet (44) cooperates with a pawl (46), and the pawl (46) is rotatably connected to a rotating shaft (47). A reset torsion spring (48) is installed between the pawl (46) and the mounting plate (45).

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