Transmission device and gas metering device

Abstract

The utility model provides a transmission device and a gas metering device, and relates to the technical field of transmission. The transmission device comprises a rotating outer ring, a transmission shaft and a plurality of positioning pins, wherein the rotating outer ring is provided with an assembly hole penetrating in the axial direction of the rotating outer ring; the transmission shaft is provided with a transmission section, the transmission section penetrates through the assembly hole, and a plurality of mounting notches distributed in the circumferential direction of the rotating outer ring are formed in the outer wall of the transmission section; the positioning pin corresponds to the mounting notch, the positioning pin is movably arranged in the mounting notch, the positioning pin is configured to be separated from the rotating outer ring when the rotating outer ring rotates in the first direction, the positioning pin is clamped with the rotating outer ring and the transmission shaft when the rotating outer ring rotates in the second direction, and the first direction is opposite to the second direction. According to the transmission device and the gas metering device, a traditional one-way needle bearing and a transmission shaft which is produced in a customized mode to be matched with the one-way needle bearing are not needed, the structure and the production process of the transmission device are simplified, and the production cost is reduced.

Description

Technical Field

[0001] The present application relates to the field of transmission technology, and in particular to a transmission device and a gas metering device. Background Art

[0002] Gas metering devices are used to measure the flow of gas in pipelines. Gas metering devices are usually equipped with a one-way anti-reversal structure to ensure the accuracy of gas measurement.

[0003] The one-way anti-reverse structure of existing gas metering devices is usually a one-way needle roller bearing. The gas metering device includes a metering unit and a transmission unit for driving the metering unit to count. The one-way anti-reverse function is achieved by installing a one-way needle roller bearing in the transmission unit.

[0004] However, in some gas metering devices, in order to install a one-way needle roller bearing, the drive shaft needs to be customized to match the inner diameter parameters of the one-way needle roller bearing, which increases the production cost of the gas metering device. Utility Model Content

[0005] In view of the above problems, the present application provides a transmission device and a gas metering device, which does not require the installation of traditional one-way needle roller bearings and customized production of transmission shafts to match the one-way needle roller bearings, thereby simplifying the structure of the transmission device, simplifying the production process, and reducing production costs.

[0006] On the one hand, the present application provides a transmission device for a gas metering device, comprising: a rotating outer ring, the rotating outer ring having an assembly hole extending through the rotating outer ring along its own axial direction; a transmission shaft, the transmission shaft having a transmission section, the transmission section passing through the assembly hole, and the outer diameter of the transmission section being smaller than the inner diameter of the assembly hole, the outer wall of the transmission section being provided with a plurality of mounting notches distributed along the circumference of the rotating outer ring; a plurality of positioning pins, the positioning pins corresponding to the mounting notches, the positioning pins being movably provided in the mounting notches, the positioning pins being configured to separate from the rotating outer ring when the rotating outer ring rotates along a first direction, and to engage with the rotating outer ring and the transmission shaft respectively when the rotating outer ring rotates along a second direction, the first direction being opposite to the second direction.

[0007] In a possible implementation, the mounting notch includes: a first side surface and a second side surface, the second side surface is located at one end of the first side surface, and the positioning pin is movable along the first side surface and detachably contacts the second side surface.

[0008] In a possible implementation, when the rotating outer ring rotates along the first direction, the positioning pin abuts against the second side surface, and there is a gap between the positioning pin and the rotating outer ring; when the rotating outer ring rotates along the second direction, the positioning pin separates from the second side surface and is clamped between the rotating outer ring and the transmission shaft.

[0009] In a possible implementation, the width of the gap is 2 silk - 20 silk.

[0010] In a possible implementation, when the positioning pin abuts against the second side surface, the distance between the positioning pin and the rotating outer ring is the largest.

[0011] In a possible implementation, when the positioning pin abuts against the second side surface, the connecting line between the central axis of the positioning pin and the central axis of the transmission shaft is perpendicular to the first side surface, and the included angle between the first side surface and the second side surface is 90°.

[0012] In a possible implementation, the included angle between the first side surface and the second side surface is 75° - 110°.

[0013] In a possible implementation, the first side surface is a plane; and / or, the second side surface is a plane.

[0014] In a possible implementation, the transmission device further includes: a driving member, the driving member includes a first gear member, the rotating outer ring is a second gear member, and the driving member is in meshing transmission with the rotating outer ring.

[0015] On the other hand, the present application provides a gas metering device, including:

[0016] A bracket;

[0017] A counting device, arranged on the bracket, and the counting device is used for measuring the gas volume passing through the gas metering device;

[0018] The transmission device according to any one of the above possible implementations, arranged on the bracket, and the transmission device is in transmission connection with the counting device through the transmission shaft to drive the counting device to act.

[0019] A transmission device and a gas metering device provided by the present application realize one-way rotation cooperation between the transmission shaft and the rotating outer ring by opening an installation notch on the transmission shaft and arranging a positioning pin in the installation notch, without installing a traditional one-way needle bearing, so the structure of the transmission device is simplified. In addition, the transmission shaft no longer needs to be customized to match the inner diameter of the one-way needle bearing, and a standardized transmission shaft can be used, thus simplifying the production steps of the transmission shaft and reducing the production cost. Brief Description of the Drawings

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0021] Figure 1 Partial structural schematic diagram of the transmission device for an embodiment of the present application;

[0022] Figure 2 is Figure 1 Structural schematic diagram when the rotating outer ring at A-A rotates along the first direction in

[0023] Figure 3 is Figure 1 Structural schematic diagram when the rotating outer ring at A-A rotates along the second direction in

[0024] Figure 4 Structural schematic diagram of one perspective of the gas metering device for some embodiments of the present application;

[0025] Figure 5 Structural schematic diagram of another perspective of the gas metering device for some embodiments of the present application;

[0026] Figure 6 Structural schematic diagram of the installation notch of the transmission shaft for some embodiments of the present application;

[0027] Figure 7 Structural schematic diagram of the installation notch of the transmission shaft for other embodiments of the present application;

[0028] Figure 8 Structural schematic diagram of the installation notch of the transmission shaft for still other embodiments of the present application.

[0029] Description of the reference numerals:

[0030] 100 - rotating outer ring; 110 - assembly hole;

[0031] 200 - transmission shaft; 210 - transmission section; 220 - installation notch; 221 - first side; 222 - second side;

[0032] 300 - positioning pin;

[0033] 400 - driving member; 410 - first gear member;

[0034] 10 - bracket;

[0035] 20 - counting device. Detailed implementation manners

[0036] In order to make the above objects, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0037] A gas metering device is an indispensable device in industrial production and scientific research, and is used to accurately measure the flow rate of gas in a pipeline or open channel. Specifically, the gas metering device is widely used in industries such as oil and natural gas, petrochemical, water treatment, food and beverage, pharmaceuticals, energy, metallurgy, pulp and paper, and building materials. By measuring the flow rate of various gases through a gas flowmeter, the stability of the production process and the product quality are ensured. In scientific research, the gas flowmeter is used to accurately measure parameters such as the flow rate and flow velocity of gas under specific conditions.

[0038] The gas metering device is usually provided with a one-way anti-reverse structure to ensure the metering accuracy of the gas. The one-way anti-reverse structure of the existing gas metering device is usually a one-way needle roller bearing. The gas metering device includes a metering part and a transmission part for driving the metering part to count, and the one-way anti-reverse function is realized by arranging the one-way needle roller bearing on the transmission part.

[0039] However, in gas metering devices of some specifications, in order to install the one-way needle roller bearing, it is necessary to customize the production of the transmission shaft according to the inner diameter parameter of the one-way needle roller bearing. In this way, the customized production requires more processes and precision control in the production process, such as precise turning, grinding, and heat treatment, etc., which increases the complexity and difficulty of production. In addition, due to the need for additional processing and quality control, the production cost of the transmission shaft will increase accordingly, thereby increasing the production cost of the gas metering device.

[0040] In addition, the one-way needle roller bearing has a high cost, and some small-sized bearings with high precision need to be imported, and the procurement cycle is long. Moreover, the internal plastic bracket of the one-way needle roller bearing will produce slight deformation at high temperatures, which is likely to affect its inner diameter size, resulting in the failure of the cooperation between the transmission shaft and the one-way needle roller bearing and slipping.

[0041] In view of this, the present application provides a transmission device and a gas metering device. By opening a mounting notch on the transmission shaft and setting a positioning pin in the mounting notch, one-way rotation cooperation between the transmission shaft and the rotating outer ring is achieved. There is no need to install traditional one-way needle roller bearings, and the structure of the transmission device is simplified. In addition, the transmission shaft no longer needs to be customized to match the inner diameter of the one-way needle roller bearing, and a standardized transmission shaft can be used, which simplifies the production steps of the transmission shaft and reduces production costs.

[0042] The following combination Figures 1 - 5 The transmission device of the first embodiment of the present application is described.

[0043] In the figure, the first direction is direction a, and the second direction is direction b.

[0044] refer to Figures 1 - 3 The transmission device of this embodiment is used for a gas metering device. Exemplarily, the gas metering device may be a gas flow meter, including but not limited to a differential pressure flow meter, a rotor flow meter, an electromagnetic flow meter, an ultrasonic flow meter, and the like.

[0045] The transmission device includes a rotating outer ring 100, a transmission shaft 200, and multiple locating pins 300. The rotating outer ring 100 has an assembly hole 110 extending axially therethrough. The inner diameter of the assembly hole 110 is larger than the outer diameter of the transmission section 210 of the transmission shaft 200, providing space for the movement of the locating pins 300. The transmission shaft 200 has a transmission section 210 extending through the assembly hole 110. The outer diameter of the transmission section 210 is smaller than the inner diameter of the assembly hole 110. The outer wall of the transmission section 210 is provided with multiple mounting notches 220 distributed along the circumference of the rotating outer ring 100. These notches 220 are used to accommodate the locating pins 300.

[0046] The positioning pin 300 corresponds to the mounting notch 220. The positioning pin 300 can be movably arranged in the mounting notch 220 and can change its position according to the rotation direction of the rotating outer ring 100. Exemplarily, there are four positioning pins 300 and four mounting notches 220 respectively. Specifically, the rotation direction of the rotating outer ring 100 includes a first direction and a second direction. The first direction is opposite to the second direction. It should be noted that the first direction is the reverse direction and the second direction is the normal metering direction.

[0047] The locating pin 300 is configured to separate from the rotating outer ring 100 when the rotating outer ring 100 rotates in the first direction. In this way, when the rotating outer ring 100 rotates in the first direction, there is no friction between the locating pin 300 and the rotating outer ring 100, and the rotation of the rotating outer ring 100 will not be transmitted to the transmission shaft 200 through the locating pin 300, thereby realizing the anti-reverse function. At this time, the transmission shaft 200 remains stationary, preventing metering errors caused by reversal.

[0048] When the rotating outer ring 100 rotates in the second direction, the positioning pins 300 are respectively clamped with the rotating outer ring 100 and the transmission shaft 200. Thus, when the rotating outer ring 100 rotates in the second direction, relative friction is generated between the positioning pins 300 and the rotating outer ring 100 and the transmission shaft 200, so that the rotational power of the rotating outer ring 100 can be transmitted to the transmission shaft 200. As the rotating outer ring 100 rotates, the positioning pins 300 drive the transmission shaft 200 to rotate synchronously, and then drive the gas metering device to perform metering operations.

[0049] It can be seen that by providing an installation notch 220 on the transmission shaft 200 and arranging the positioning pins 300 in the installation notch 220, one-way rotational cooperation between the transmission shaft 200 and the rotating outer ring 100 is achieved. There is no need to install a traditional one-way needle bearing, and the structure of the transmission device is simplified. In addition, the transmission shaft 200 no longer needs to be customized to match the inner diameter of the one-way needle bearing, and a standardized transmission shaft 200 can be used. Thus, the production steps of the transmission shaft 200 are simplified and the production cost is reduced.

[0050] In addition, the installation of the traditional one-way needle bearing is cancelled, the high-cost one-way needle bearing is removed, and the product cost is reduced. Moreover, the cooperation of the rotating outer ring 100, the transmission shaft 200 and the positioning pins 300 in this design can adapt to high-temperature environments, avoiding the high-temperature deformation of the plastic bracket 10 inside the traditional one-way needle bearing, and ensuring the transmission stability.

[0051] Furthermore, by adjusting the sizes and shapes of the rotating outer ring 100, the transmission shaft 200 and the positioning pins 300, a transmission device applicable to gas metering devices of different specifications and models can be designed, improving the versatility and reliability of the transmission device.

[0052] In some embodiments, in combination with Figure 2 and Figure 3 , the installation notch 220 includes a first side surface 221 and a second side surface 222. The second side surface 222 is located at one end of the first side surface 221. The positioning pin 300 is movable along the first side surface 221 and is detachably in contact with the second side surface 222. A certain angle or drop is formed between the first side surface 221 and the second side surface 222. When the rotating outer ring 100 rotates in the first direction or the second direction, the positioning pin 300 abuts against the second side surface 222 and remains stationary with respect to the transmission shaft 200 to prevent reverse rotation, or the positioning pin 300 separates from the second side surface 222 and contacts the rotating outer ring 100 to drive the rotating shaft to rotate, achieving one-way rotational cooperation between the transmission shaft 200 and the rotating outer ring 100.

[0053] Specifically, in some embodiments, in combination with Figure 2 and Figure 3, when the rotating outer ring 100 rotates in the first direction, it can be seen from the above that the first direction is the reverse direction, the positioning pin 300 abuts against the second side surface 222, and there is a gap between the positioning pin 300 and the rotating outer ring 100, that is, when the rotating outer ring 100 rotates in the first direction, the positioning pin 300 will move along the first side surface 221 of the installation notch 220. As the rotating outer ring 100 rotates, the positioning pin 300 will eventually contact the second side surface 222. At this time, there is a gap between the positioning pin 300 and the rotating outer ring 100, and the two are separated, that is, the positioning pin 300 no longer generates a direct driving force on the transmission shaft 200, the transmission shaft 200 remains stationary, and the anti-reverse function is achieved.

[0054] When the rotating outer ring 100 rotates in the second direction, as can be seen from the above, the second direction is the normal metering direction, the positioning pin 300 is separated from the second side surface 222, and is clamped between the rotating outer ring 100 and the transmission shaft 200, that is, when the rotating outer ring 100 rotates in the second direction, the positioning pin 300 will move along the first side surface 221 of the mounting notch 220. At this time, the positioning pin 300 will be separated from the second side surface 222, and the positioning pin 300 will maintain contact with the inner wall of the rotating outer ring 100 and move with the rotation of the rotating outer ring 100. At the same time, the positioning pin 300 will drive the transmission shaft 200 to rotate synchronously, thereby realizing the metering operation of the gas metering device.

[0055] It should be noted that the positioning pin 300, the inner wall of the rotating outer ring 100, and the first side surface 221 all need to have a certain friction coefficient to achieve a driving relationship between the positioning pin 300, the rotating outer ring 100, and the transmission shaft 200. For example, the friction coefficient can be increased by roughening the surface or applying a friction agent.

[0056] In one possible implementation, the width of the gap is 2 to 20 threads. For example, the width of the gap can be 2 threads, 3 threads, 5 threads, 7 threads, 10 threads, 13 threads, 15 threads, 18 threads, or 20 threads. Of course, this application does not limit this, and the width of the gap can be reasonably set within the above range according to actual needs. It is understandable that when the transmission device is installed vertically, that is, the transmission shaft 200 and the positioning pin 300 are both placed vertically, and the rotating outer ring 100 rotates in the first direction, the positioning pin 300 and the transmission shaft may remain relatively stationary or may slip against each other; when the transmission device is installed horizontally, that is, the transmission shaft 200 and the positioning pin 300 are both placed horizontally, and the rotating outer ring 100 rotates in the first direction, some positioning pins 300 (i.e., the positioning pins 300 whose bottoms are not supported by the first side surface 221) will first touch the rotating outer ring 100 under the action of gravity, then lose contact with the rotating outer ring 100, and repeat this process.

[0057] In a possible implementation, when the positioning pin 300 abuts against the second side surface 222, the distance between the positioning pin 300 and the rotating outer ring 100 is the largest. In other words, the position where the positioning pin 300 abuts against the second side surface 222 is the position with the largest distance from the rotating outer ring 100 during the movement of the positioning pin 300 along the first side surface 221.

[0058] Specifically, the distance between the second side surface 222 and the reference line L is less than or equal to the radius R of the positioning pin 300. The reference line L passes through the central axis of the transmission shaft 200 and is perpendicular to the first side surface 221.

[0059] Reference Figure 6 , the distance h1 between the second side surface 222 and the reference line L is equal to the radius R of the positioning pin 300. The second side surface 22 is the position with the largest distance between the positioning pin 300 and the rotating outer ring 100. When the positioning pin 300 abuts against the second side surface 222 and the rotating outer ring 100 rotates in the first direction, since there is enough distance between the positioning pin 300 and the rotating outer ring 100, it is possible to avoid jamming and friction between the positioning pin 300 and the rotating outer ring 100. When the rotating outer ring 100 rotates in the second direction, the distance between the positioning pin 300 and the rotating outer ring will linearly decrease, and the movement of the positioning pin 300 will be smoother, making the rotating outer ring 100 drive the transmission shaft 200 to rotate more smoothly.

[0060] Reference Figure 7 , the distance h2 between the second side surface 222 and the reference line L is less than the radius of the positioning pin. When the rotating outer ring 100 rotates in the second direction, the distance between the positioning pin 300 and the rotating outer ring will linearly decrease, and the movement of the positioning pin 300 will be smoother, making the rotating outer ring 100 drive the transmission shaft 200 to rotate more smoothly. However, when the rotating outer ring 100 rotates in the first direction, even if the positioning pin 300 abuts against the second side surface 222 and the distance between the positioning pin 300 and the rotating outer ring 100 is the largest, it is still less than the distance between the positioning pin 300 and the rotating outer ring 100 when the distance between the second side surface 222 and the reference line is equal to the radius R of the positioning pin 300, resulting in possible jamming of the rotating outer ring 100.

[0061] Reference Figure 8, the distance h3 between the second side surface 222 and the reference line L is greater than the radius R of the positioning pin. When the outer rotating ring 100 rotates along the second direction, the distance between the positioning pin 300 and the outer rotating ring will first increase and then decrease, and the positioning pin 300 may jump and move smoothly; when the outer rotating ring 100 rotates along the first direction, even if the positioning pin 300 abuts against the second side surface 222, the distance between the positioning pin 300 and the outer rotating ring 100 is still less than the distance between the positioning pin 300 and the outer rotating ring 100 when the distance between the second side surface 222 and the reference line is equal to the radius R of the positioning pin 300, resulting in a possible jamming phenomenon of the outer rotating ring 100.

[0062] Combined with Figures 6 - 8 , in summary, it can be seen that by constructing the transmission device such that when the positioning pin 300 abuts against the second side surface 222, the distance between the positioning pin 300 and the outer rotating ring 100 is the largest. In this way, at least it can be ensured that when the outer rotating ring 100 rotates along the second direction, the distance between the positioning pin 300 and the outer rotating ring decreases linearly, the movement of the positioning pin 300 is smoother, and the outer rotating ring 100 drives the transmission shaft 200 to rotate more smoothly.

[0063] In a possible implementation, referring to Figure 6 , when the positioning pin 300 abuts against the second side surface 222, the connecting line L1 between the central axis of the positioning pin 300 and the central axis of the transmission shaft 200 is perpendicular to the first side surface 221.

[0064] In this way, it not only ensures that when the outer rotating ring 100 rotates along the second direction, the distance between the positioning pin 300 and the outer rotating ring decreases linearly, the movement of the positioning pin 300 is smoother, and the outer rotating ring 100 drives the transmission shaft 200 to rotate more smoothly, but also when the outer rotating ring 100 rotates along the first direction, there is no jamming phenomenon between the positioning pin 300 and the outer rotating ring.

[0065] In some embodiments, combined with Figure 2 and Figure 3 , the included angle between the first side surface 221 and the second side surface 222 is 75° - 110°. For example, the included angle between the first side surface 221 and the second side surface 222 can be 75°, 80°, 85°, 90°, 95°, 100°, 105 or 110°. Of course, the present application does not limit this, and the included angle between the first side surface 221 and the second side surface 222 can be reasonably selected according to the actual situation within the above range. The setting of the included angle between the first side surface 221 and the second side surface makes the positioning pin 300 generate a contact force when moving to the second side surface 222. In the anti-reverse rotation direction, an appropriate included angle ensures the stability between the positioning pin 300 and the transmission shaft 200. In practical applications, an intermediate value between 75° and 110° is usually selected for this included angle.

[0066] Optionally, in combination with Figure 2 and Figure 3 , the included angle between the first side surface 221 and the second side surface 222 is 90°. In this way, a right angle is formed between the first side surface 221 and the second side surface 222. This right angle contact provides a stop point when the positioning pin 300 moves to the second side surface 222, ensuring the stability of the positioning pin 300 during the transmission process. In addition, the right angle contact also reduces the possibility of the positioning pin 300 slipping when subjected to a lateral force, improving the reliability of the transmission device.

[0067] In some embodiments, in combination with Figure 2 and Figure 3 , the shapes of the plurality of mounting gaps twenty-two zero are the same, and they are circumferentially arranged on the outer wall of the transmission shaft two hundred along the axis of the transmission shaft two hundred. For two adjacent mounting gaps twenty-two zero arranged circumferentially along the rotating outer ring one hundred, the first side surface 221 of one of them is parallel to the second side surface 222 of the other. In this way, the uniformity of the arrangement of the mounting gaps twenty-two zero is ensured, so that when each positioning pin three hundred moves within each mounting gap twenty-two zero, the transmission shaft two hundred is evenly stressed, reducing the additional resistance and energy loss caused by the irregular distribution of the first side surface 221 and the second side surface 222 of the mounting gap twenty-two zero, and improving the transmission efficiency.

[0068] In some embodiments, in combination with Figure 2 and Figure 3 , the first side surface 221 is one of a plane and a non-plane. When the first side surface 221 is a plane, the first plane provides a stable contact surface for the positioning pin three hundred, enabling the positioning pin three hundred to maintain a stable contact with it during the movement process to reduce impact and vibration and improve the transmission stability; when the first side surface 221 is a non-plane, the non-plane includes an inclined surface, a curved surface or other complex shapes. Exemplarily, a guiding groove for guiding the positioning pin three hundred can be opened on this plane to ensure the stability of its rolling. In addition, exemplarily, the first side surface 221 can also be designed as a plane with uneven roughness, so that when the rotating outer ring one hundred rotates in the first direction, the positioning pin three hundred quickly separates from the rotating outer ring one hundred, and when the rotating outer ring one hundred rotates in the second direction, the positioning pin three hundred quickly engages with the rotating outer ring one hundred.

[0069] In some embodiments, in combination with Figure 2 and Figure 3, the second side surface 222 is one of a plane and a non - plane. When the second side surface 222 is a plane, the second plane provides a stable contact surface for the positioning pin 300, enabling it to form an effective contact with the positioning pin 300 to prevent the reverse rotation of the transmission shaft 200; when the second side surface 222 is a non - plane, the second side surface 222 can have a specific shape and function, such as providing an additional locking mechanism or adjusting the transmission characteristics. Exemplarily, a receiving groove for accommodating the positioning pin 300 can be provided on the second side surface 222, so that when the positioning pin 300 contacts the second side surface 222, it is located within the receiving groove, ensuring its stability.

[0070] As mentioned above, the first side surface 221 and the second side surface 222 can be: the first side surface 221 is a plane and the second side surface 222 is a plane; or the first side surface 221 is a non - plane and the second side surface 222 is a plane; or the first side surface 221 is a plane and the second side surface 222 is a non - plane; or the first side surface 221 is a non - plane and the second side surface 222 is a non - plane combination. Specifically, it can be selected according to actual design requirements and usage environments, and no limitation is made here.

[0071] In some embodiments, combined with Figure 4 , the transmission device further includes a driving member 400. The driving member 400 is in transmission connection with the rotating outer ring 100 to drive the rotating outer ring 100 to rotate in the first direction or the second direction. Exemplarily, the driving member 400 is connected to the gas metering component. When the gas metering component drives the driving member 400 to rotate according to the gas flow rate change, and then the driving member 400 drives the rotating outer ring 100 to rotate in the first direction or the second direction.

[0072] In some embodiments, combined with Figure 4 , the driving member 400 includes a first gear member 410, and the rotating outer ring 100 is a second gear member. The driving member 400 is in meshing transmission with the rotating outer ring 100. Specifically, the first gear member 410 is used as the driving part, and the rotating outer ring 100 is used as the driven part. The power is transmitted through the meshing of the teeth. Exemplarily, both the first gear member 410 and the rotating outer ring 100 are bevel gears. In this way, the first gear member 410 and the rotating outer ring 100 can occupy less space in the plane perpendicular to the axis, making full use of the installation space. When installed inside the gas metering device, it can enhance the space utilization rate of the gas metering device, reduce the overall volume of the gas metering device, and improve the market competitiveness.

[0073] Next, the gas metering device of the second - aspect embodiment of the present application will be described.

[0074] Refer to Figure 4 and Figure 5The gas metering device of this embodiment can be a gas flowmeter. Gas flowmeters can be classified into various types based on their measurement principles and application scopes, including but not limited to differential pressure flowmeters, rotameters, electromagnetic flowmeters, and ultrasonic flowmeters. The gas metering device of this embodiment can include a bracket 10, a counting device 20, and the transmission device described in the above embodiment.

[0075] Among them, the counting device 20 is arranged on the bracket 10, and the counting device 20 is used to measure the amount of gas passing through the gas metering device. The transmission device is arranged on the bracket 10, and the transmission device is connected to the counting device 20 through the transmission shaft 200 to drive the counting device 20 to operate. The transmission device is a key component connecting the gas flow and the counting device 20. When the gas passes through the transmission device, its flow characteristics are sensed and converted into mechanical motion, and the mechanical motion is transmitted to the counting device 20 through the transmission device. The counting device 20 counts according to the received motion signal and outputs the measurement result in the form of a numerical value or signal. In this way, the gas metering device realizes the measurement operation of the amount of gas passing through it.

[0076] The gas metering device of the embodiment of the present application realizes one-way rotational cooperation between the transmission shaft 200 and the rotating outer ring 100 by providing a mounting notch 220 on the transmission shaft 200 of the transmission device and setting a positioning pin 300 in the mounting notch 220. There is no need to install a traditional one-way needle roller bearing, and the structure of the transmission device is simplified. In addition, the transmission shaft 200 no longer needs to be customized to match the inner diameter of the one-way needle roller bearing, and a standardized transmission shaft 200 can be used, thereby simplifying the production steps of the transmission shaft 200 and reducing production costs.

[0077] The various embodiments or implementation methods in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments, and the same or similar parts between the various embodiments can be referenced to each other.

[0078] It should be noted that phrases such as "one embodiment," "an embodiment," "exemplary embodiments," and "some embodiments" in this specification may indicate embodiments that may include a particular feature, structure, or characteristic, but not every embodiment necessarily includes that particular feature, structure, or characteristic. Furthermore, such phrases do not necessarily refer to the same embodiment. Furthermore, when a particular feature, structure, or characteristic is described in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such feature, structure, or characteristic in conjunction with other embodiments, whether explicitly described or not.

[0079] In general, terms should be understood, at least in part, in light of their use in the context. For example, at least in part depending on the context, the term "one or more" used herein can be used to describe any feature, structure, or property in the sense of a singular, or can be used to describe a combination of features, structures, or properties in the sense of a plural. Similarly, at least in part depending on the context, terms such as "a" or "the" can also be understood to convey a singular usage or a plural usage.

[0080] It should be readily understood that the terms "on", "above", and "over" in this disclosure should be construed in the broadest manner such that "on" not only means "directly on something", but also includes the meaning of "on something" with intervening features or layers therebetween, and "above" or "over" not only includes the meaning of "above" or "over something", but can also include the meaning of "above" or "over something" with no intervening features or layers therebetween (i.e., directly on something).

[0081] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A transmission device for a gas metering device, characterized in that: include: A rotating outer ring, wherein the rotating outer ring has an assembly hole penetrating along the axial direction of the rotating outer ring; A transmission shaft, the transmission shaft having a transmission section, the transmission section being inserted into the assembly hole, the outer diameter of the transmission section being smaller than the inner diameter of the assembly hole, and the outer wall of the transmission section being provided with a plurality of mounting notches distributed along the circumference of the rotating outer ring; A plurality of positioning pins, each corresponding to the mounting notch, each movably provided in the mounting notch, the positioning pins being configured to separate from the rotating outer ring when the rotating outer ring rotates along a first direction, and to engage with the rotating outer ring and the transmission shaft respectively when the rotating outer ring rotates along a second direction, the first direction being opposite to the second direction.

2. The transmission device according to claim 1, characterized in that The installation notch includes a first side surface and a second side surface, wherein the second side surface is located at one end of the first side surface, and the positioning pin is movable along the first side surface and is in detachable contact with the second side surface.

3. The transmission device according to claim 2, characterized in that: When the rotating outer ring rotates along the first direction, the positioning pin abuts against the second side surface, and a gap is formed between the positioning pin and the rotating outer ring; When the rotating outer ring rotates along the second direction, the positioning pin is separated from the second side surface and is clamped between the rotating outer ring and the transmission shaft.

4. The transmission device according to claim 3, characterized in that The width of the gap is 2 threads to 20 threads.

5. The transmission device according to claim 3, characterized in that: When the positioning pin abuts against the second side surface, the distance between the positioning pin and the rotating outer ring is the largest.

6. The transmission device according to claim 3, characterized in that: When the positioning pin abuts against the second side surface, a line connecting the central axis of the positioning pin and the central axis of the transmission shaft is perpendicular to the first side surface. The included angle between the first side surface and the second side surface is 90°.

7. The transmission device according to claim 2, characterized in that: An included angle between the first side surface and the second side surface is 75°-110°.

8. The transmission device according to any one of claims 2 to 7, characterized in that: The first side surface is a plane; and / or the second side surface is a plane.

9. The transmission device according to any one of claims 2 to 7, characterized in that: The transmission device further includes a driving member, the driving member includes a first gear member, the rotating outer ring is a second gear member, and the driving member is meshed with the rotating outer ring for transmission.

10. A gas metering device, characterized in that: include: Bracket; a counting device, disposed on the bracket, for measuring the amount of gas passing through the gas metering device; The transmission device according to any one of claims 1 to 9 is arranged on the bracket, and the transmission device is connected to the counting device through the transmission shaft to drive the counting device to operate.

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