False counting prevention gas meter

Abstract

The embodiment of the utility model provides an anti-miscounting gas meter. The anti-miscounting gas meter comprises a sampling gear set and a braking mechanism. The sampling gear set records the gas consumption according to the number of turns of rotation; the brake mechanism comprises a sliding block and a reset mechanism, the reset mechanism is connected with the sliding block, and the reset mechanism pushes one end of the sliding block to abut against the gear face of the sampling gear set gear so as to lock the sampling gear set; when the sampling gear set rotates in the forward direction, the gear face of the sampling gear set pushes the sliding block to slide so as to unlock the sampling gear set till the sliding block abuts against the tooth top of the sampling gear set gear, and if the sampling gear set continues to rotate in the forward direction, the reset mechanism pushes the sliding block to abut against the gear face of the next sampling gear set gear. When the gas meter is vibrated, the forward rotation angle of the sampling gear set can be limited, the sampling gear set is prevented from rotating reversely, and miscounting of the gas meter can be effectively avoided.

Description

Technical Field

[0001] This application relates to the field of gas meter technology, and in particular to a gas meter that prevents false counting. Background Technology

[0002] Currently, in the gas meter industry, the output gears and internal connections of the base meter are connected and driven by non-contact magnetic coupling. This, in turn, drives the counter's digit wheel and the sampling gear used for electromechanical conversion through a series of gear transmissions. The market demands increasingly higher metering accuracy for the electronic components of the electromechanical conversion system; the standard 10L accuracy has been replaced by 2L accuracy, which has become a common customization requirement. Furthermore, the accuracy requirements for electromechanical conversion will continue to rise.

[0003] Gas meters inevitably experience vibration or impact during transportation. When the base meter's output gear encounters external force, it has a certain range of angular rotation. This rotation, through a series of gear transmissions, drives the sampling gear on the counter, potentially causing false counting. The higher the metering accuracy of the electromechanical conversion, the larger the gear ratio from the output gear to the sampling gear. This means that when the output gear rotates under external force, the angle by which it drives the sampling gear to rotate is greater, increasing the risk of false counting. Utility Model Content

[0004] This application provides a gas meter that prevents false counting, in order to solve the technical problem that gas meters in the prior art are prone to false counting when subjected to vibration and impact.

[0005] This application provides a gas meter that prevents false counting, the gas meter including a sampling gear set and a braking mechanism;

[0006] The sampling gear set records the gas consumption by the number of rotations.

[0007] The braking mechanism includes a slider and a reset mechanism. The reset mechanism is connected to the slider. The reset mechanism pushes one end of the slider to abut against the gear surface of the sampling gear set to lock the sampling gear set.

[0008] When the sampling gear set rotates in the forward direction, the gear surface of the sampling gear set pushes the slider to slide to unlock the sampling gear set until the slider abuts against the tooth tip of the gear in the sampling gear set. If the sampling gear set continues to rotate in the forward direction, the reset mechanism pushes the slider to abut against the gear surface of the next gear in the sampling gear set.

[0009] In one possible design, the sampling gear set includes a sampling gear and a ratchet, the ratchet being fixed to the sampling gear so that the ratchet and the sampling gear rotate together;

[0010] The reset mechanism pushes one end of the slider to abut against the helical tooth surface of the ratchet to lock the ratchet;

[0011] When the ratchet rotates in the forward direction, the ratchet helical teeth push the slider to slide to unlock the ratchet until the slider abuts against the tip of the ratchet helical teeth. If the ratchet continues to rotate in the forward direction, the reset mechanism pushes the slider to abut against the next ratchet helical tooth surface.

[0012] In one possible design, one end of the slider is provided with a mating inclined surface, the inclination angle of which is the same as the inclination angle of the ratchet helical tooth inclined surface, so that the mating inclined surface and the ratchet helical tooth inclined surface fit and abut against each other.

[0013] In one possible design, when the reset mechanism pushes one end of the slider to abut against the helical tooth surface of the ratchet to lock the ratchet, if the ratchet rotates in the opposite direction, the ratchet sidewall abuts against the slider sidewall, so that the thrust of the ratchet sidewall on the slider sidewall is perpendicular to the slider sliding direction.

[0014] In one possible design, the braking mechanism further includes a guide mechanism, which has a sliding track inside, and the slider is disposed within the sliding track;

[0015] The slider has an arc surface on its side, and the arc surface is slidably connected to the sliding track.

[0016] In one possible design, the reset mechanism includes a fixed structure and an elastic element, wherein the elastic element is connected to the fixed structure and the slider respectively;

[0017] The elastic element is configured to push one end of the slider to abut against the helical tooth surface of the ratchet to lock the ratchet. When the ratchet rotates in the forward direction, the helical tooth of the ratchet pushes the slider to slide within the sliding track to unlock the ratchet. The slider causes the elastic element to undergo elastic deformation until the slider abuts against the tip of the helical tooth of the ratchet. If the ratchet continues to rotate in the forward direction, the elastic element pushes the slider against the next helical tooth surface of the ratchet through elastic deformation.

[0018] In one possible design, the elastic element is a spring, one end of which is connected to the fixed structure and the other end of which is connected to the slider;

[0019] The fixed structure is provided with a first fixed shaft, and one end of the spring is sleeved on the first fixed shaft;

[0020] The other end of the slider is provided with a second fixed shaft and a baffle, and the other end of the spring is sleeved on the second fixed shaft and abuts against the baffle.

[0021] In one possible design, the gas meter includes a counter assembly, which includes a mechanical digit wheel and a counter bracket. The mechanical digit wheel is disposed inside the counter bracket, and the mechanical digit wheel displays the gas consumption reading by rotating.

[0022] The fixing structure is a fixing bracket, which is mounted on the counter bracket.

[0023] In one possible design, the fixed structure has a stepped structure at one end near the sampling gear, and when the spring pushes one end of the slider to abut against the helical tooth surface of the ratchet, the baffle abuts against the side wall of the stepped structure.

[0024] In one possible design, the guide mechanism includes at least two latches, which are disposed on the top wall of the stepped structure, and each latch has a fixing groove.

[0025] The latches are configured such that at least two latches are arranged opposite each other so that the fixing grooves form the sliding track.

[0026] The gas meter provided in this application embodiment prevents false counting. Because the reset mechanism pushes the slider to abut against the tooth surface of the sampling gear set, even when the sampling gear set rotates forward, it needs to overcome the resistance of the reset mechanism to push the slider to slide. This ensures that when the sampling gear set is subjected to minor vibrations and rotates forward, it cannot rotate if it cannot overcome the resistance of the reset mechanism, effectively preventing false counting by the gas meter. When the sampling gear set is subjected to significant vibrations and overcomes the resistance of the reset mechanism, rotating through one gear angle, the reset mechanism can push the slider to reset. This device effectively limits the rotation angle of the sampling gear set, reducing the probability of a complete forward rotation and thus reducing the probability of false counting. Attached Figure Description

[0027] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0028] Figure 1 This is an exploded schematic diagram of the gas meter structure provided in an embodiment of this application;

[0029] Figure 2 This is a cross-sectional view of the gas meter structure provided in the embodiment of this application;

[0030] Figure 3 This is a front view of the gas meter structure provided in the embodiment of this application;

[0031] Figure 4 A schematic diagram of the sampling gear set provided in the embodiments of this application;

[0032] Figure 5This is a schematic diagram of the limiting device provided in the embodiments of this application. Figure 1 ;

[0033] Figure 6 This is a schematic diagram of the unlocking of the limiting device provided in the embodiments of this application;

[0034] Figure 7 This is a schematic diagram of the limiting device provided in the embodiments of this application. Figure 2 ;

[0035] Figure 8 Schematic diagram of the installation of the limiting device provided in the embodiments of this application Figure 1 ;

[0036] Figure 9 This is a schematic diagram of the installation of the limiting device provided in the embodiments of this application. Figure 2 ;

[0037] Figure 10 This is a schematic diagram of the slider structure provided in an embodiment of this application;

[0038] Figure 11 This is a schematic diagram of the limiting device provided in the embodiments of this application. Figure 3 .

[0039] Figure label:

[0040] 100-Gas Meter Base;

[0041] 110 - Outer magnetic ring;

[0042] 200-Output gear assembly;

[0043] 210 - Inner magnetic ring;

[0044] 220 - Output gear;

[0045] 300-Transmission gear assembly;

[0046] 400 - Base;

[0047] 500-counter component;

[0048] 510 - Mechanical type wheel;

[0049] 520 - Counter bracket;

[0050] 600-Sampling Gear Set;

[0051] 610 - Sampling gear;

[0052] 620-Ratchet;

[0053] 700-PCB board;

[0054] 710 - Photosensitive element;

[0055] 800 - Braking mechanism;

[0056] 810 - Slider;

[0057] 811 - Fitting inclined plane;

[0058] 812 - Second fixed shaft;

[0059] 813-Baffle;

[0060] 814 - Circular arc surface;

[0061] 820 - Guiding mechanism;

[0062] 821-Snap-on;

[0063] 822-Limiting reinforcement;

[0064] 830 - Reset mechanism;

[0065] 831-Fixed structure;

[0066] 832 - Elastic component;

[0067] 833 - First fixed axis;

[0068] 834 - Step structure.

[0069] The accompanying drawings illustrate specific embodiments of this application, which will be described in more detail below. These drawings and descriptions are not intended to limit the scope of the concept in any way, but rather to illustrate the concept of this application to those skilled in the art through reference to particular embodiments. Detailed Implementation

[0070] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0071] Because existing gas meters are prone to miscounting due to the rotation of sampling gears when subjected to vibration or impact, the technical concept of this application is to design a device to limit the rotation of the sampling gear set. This device includes a sampling gear set and a braking mechanism. The braking mechanism includes a slider and a reset mechanism. The reset mechanism is connected to the slider and pushes the slider to abut against the tooth surfaces of the sampling gear set. When the sampling gear set rotates forward, the tooth surfaces of the sampling gear set push the slider to slide until the tooth tips of the sampling gear set abut against the slider. As the sampling gear set continues to rotate, the reset mechanism pushes the slider to reset, causing the slider to abut against the tooth surfaces of the next sampling gear set. When the sampling gear set rotates in reverse, the sampling gear set cannot push the slider to slide, thus locking the sampling gear set.

[0072] The technical solution of this application and how the technical solution of this application solves the above-mentioned technical problems are described in detail below with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described again in some embodiments. The embodiments of this application will now be described with reference to the accompanying drawings.

[0073] Example 1

[0074] Figure 1 This is an exploded view of the gas meter structure provided in an embodiment of this application, as shown below. Figure 1 As shown, the gas meter includes a gas meter base 100, an output gear assembly 200, a transmission gear assembly 300, a base 400, a counter assembly 500, a sampling gear set 600, and a PCB board 700. Figure 2 This is a cross-sectional view of the gas meter structure provided in an embodiment of this application, such as... Figure 2 As shown, the gas meter base 100 includes an outer magnetic ring 110, the output gear assembly 200 includes an inner magnetic ring 210 and an output gear 220, the counter assembly 500 includes a mechanical digit wheel 510, and a photosensitive element 710 is provided on the PCB board 700. The outer magnetic ring 110 on the gas meter base 100 surrounds the inner magnetic ring 210 of the output gear 220. When the gas meter base 100 is supplied with gas, the movement of the mechanism drives the outer magnetic ring 110 on the base to rotate, which in turn drives the inner magnetic ring 210 to rotate through magnetic coupling, thereby driving the output gear 220 to rotate. The output gear 220 then drives the various gears on the transmission gear assembly 300 to rotate, ultimately driving the mechanical digit wheel 510 and the sampling gear set 600 on the counter assembly 500 to rotate. The rotation of the mechanical digit wheel 510 generates a gas consumption reading.

[0075] The upper surface of the sampling gear set 600 can be provided with a light sampling reflective surface that is half white and half black. Figure 3 This is a front view of the gas meter structure provided in the embodiments of this application, such as... Figure 3As shown, a photosensitive element 710 for electromechanical conversion sampling is provided on the PCB board 700, and the photosensitive element 710 is located above the black and white reflective surface of the sampling gear set 600. When the sampling gear set 600 rotates, the black and white reflective surface rotates accordingly, and the semi-circular white reflective surface and the semi-circular black reflective surface alternately rotate to be below the photosensitive element, reflecting light. The reflection intensities of the two surfaces are different, and the photosensitive element receives different light intensities, generating waveform signals with different AD values. The photosensitive element 710 collects pulse waveforms with a fixed period, and calculates the measurement value through pulse waveform analysis. One rotation of the sampling gear set 600 generates a pulse waveform of one cycle.

[0076] It should be noted that the gas meter in this application is not limited to... Figure 1 , Figure 2 , Figure 3 The structure shown, for example, can be a turbine gas meter where gas flows through turbine blades, driving the turbine to rotate, and a sensor detects the number of turbine rotations to record gas consumption. The sampling gear set 600 can also have a magnet mounted on top, and a magnetic element positioned at the location of the photosensitive element 710 to record gas consumption via magnetic sampling. For ease of explanation, subsequent descriptions will be based on... Figure 1 , Figure 2 , Figure 3 The structure of the gas meter shown is explained below.

[0077] Gas meters are frequently exposed to external factors such as vibration and drops during transportation. Some gas meters are installed under kitchen countertops, where the meter body can vibrate due to the violent vibrations caused by manual chopping. Because the gas meter base 100 is subjected to external forces when gas is not flowing, the movement of the mechanism has a certain range of motion. This means the outer magnetic ring 110 is not completely fixed and can rotate under external forces. Additionally, the clearance between gears causes them to rotate within a certain range under external forces. All of these factors can potentially cause the sampling gear group 600 on the transmission gear assembly 300 and the counter assembly 500 to rotate back and forth within a certain angle range. When the sampling gear group 600 is not restrained, its back-and-forth rotation can cause the white and black reflective surfaces to alternately pass under the photosensitive element 710. The photosensitive element 710 can then collect a pulse waveform for one cycle, resulting in false counting.

[0078] Figure 4 This is a schematic diagram of the sampling gear set provided in the embodiments of this application, as shown below. Figure 4As shown, the sampling gear set 600 includes a sampling gear 610 and a ratchet 620 below the sampling gear 610. The ratchet 620 is fixed together with the sampling gear 610 and coaxial, so that the ratchet 620 and the sampling gear 610 rotate together and in the same direction. It should be noted that the sampling gear set 600 may not include the ratchet 620, and the ratchet 620 can be replaced with other types of gears, as long as the gear cooperates with the slider 810 and can push the slider 810 to slide. The sampling gear set 600 including the ratchet 620 is only a preferred embodiment of this application. Hereinafter, this embodiment will be described using the sampling gear set 600 including the ratchet 620 as an example.

[0079] Figure 5 This is a schematic diagram of the limiting device provided in the embodiments of this application. Figure 1 ,like Figure 5 As shown, the limiting device includes a slider 810, a guide mechanism 820, and a reset mechanism 830. The guide mechanism 820 has a sliding rail, and the slider 810 is disposed within the sliding rail and slidably connected to the sliding rail. The reset mechanism 830 is connected to the slider 810. Since the ratchet 620 and the sampling gear 610 are fixed and rotate together, when the gas meter is subjected to vibration or impact, the limiting device can limit the rotation of the sampling gear 610 by limiting the rotation of the ratchet 620, thereby preventing false counting.

[0080] The working principle of the limit device will be explained in detail below.

[0081] Figure 5 The diagram shows the initial state of the device, i.e., when the ratchet 620 is not rotating. The reset mechanism 830 pushes one end of the slider 810 to abut against the helical tooth surface of the ratchet 620 to lock the ratchet 620. One end of the slider 810 is provided with a mating inclined surface 811, the inclination angle of which is the same as the inclination angle of the helical tooth surface of the ratchet 620, so that the mating inclined surface 811 and the helical tooth surface of the ratchet 620 fit together and abut. The function of the mating inclined surface 811 is to ensure that the ratchet 620, when... Figure 5 When the ratchet 620 rotates counterclockwise as indicated by the arrow above, the inclined surface of the helical teeth can push the slider 810 to slide to the left in the sliding track.

[0082] Figure 6 This is a schematic diagram of the unlocking of the limiting device provided in the embodiments of this application, as shown below. Figure 6 As shown, when the ratchet 620 rotates forward, it pushes the slider 810 to its limit position, that is, when the tip of the helical tooth of the ratchet 620 contacts the mating inclined surface 811 of the slider 810, as the ratchet 620 continues to rotate, the reset mechanism 830 pushes the slider 810 to slide to the right to reset, and the device returns to its original position. Figure 4The state shown is as follows. Because the reset mechanism 830 applies a force to the slider 810 to push it into contact with the helical tooth surface of the ratchet 620, the ratchet 620 must overcome this force even when rotating forward to push the slider 810 to slide and unlock the ratchet 620. Therefore, when the sampling gear 610 is subjected to vibration and rotates forward, if the vibration is small, the sampling gear 610 cannot push the slider 810 to slide and unlock the ratchet 620. Furthermore, after the ratchet 620 rotates through the angle of one helical tooth of the ratchet 620, the reset mechanism 830 will push the slider 810 to reset and relock the ratchet 620. Therefore, when subjected to short-term vibration impact, the angle that the ratchet 620 can rotate is very limited. Only when the force of the gas pushes the sampling gear 610 to rotate continuously forward will the sampling gear 610 drive the ratchet 620 to rotate forward together. At this time, the ratchet 620 can continuously overcome the resistance of the reset mechanism 830 and rotate continuously, thus allowing the sampling gear 610 to normally record the gas consumption by the number of rotations.

[0083] like Figure 5 As shown, when the ratchet 620 rotates in the reverse direction in the clockwise direction, the force exerted by the side wall of the helical teeth of the ratchet 620 on the side of the slider 810 is perpendicular to the direction of movement of the slider 810, thus creating a dead point position and realizing the reverse braking of the ratchet 620, thereby preventing the sampling gear 610 from rotating in the reverse direction in the clockwise direction.

[0084] It should be noted that, Figure 5 , Figure 6 The reset mechanism 830 shown is for illustrative purposes only. In this embodiment, the reset mechanism 830 can reset the slider 810 using various principles. For example, it can use the elastic force of a spring to achieve reset; it can use the pressure of compressed air to achieve reset, where a cylinder or pneumatic device moves under the action of an external force, and when the external force disappears, the compressed air pushes the slider 810 back to its initial position; the reset mechanism 830 can also use the magnetic force of a magnet to achieve reset of the slider 810, where the slider 810 pushes the magnet to move, and when the pushing force on the slider 810 disappears, the magnet, under the action of magnetic force, drives the slider 810 back to its original position.

[0085] This embodiment has the following technical effects: The ratchet 620 can be fixed to the sampling gear 610 of the gas meter. The sampling gear 610 and the ratchet 620 rotate together. Since the reset mechanism 830 pushes the slider 810 to abut against the helical tooth surface of the ratchet 620, even when the sampling gear 610 drives the ratchet 620 to rotate in the forward direction, it still needs to overcome the resistance of the reset mechanism 830 to push the slider 810 to slide. This ensures that when the sampling gear 610 is subjected to slight vibration and rotates in the forward direction, it cannot rotate if it cannot overcome the resistance of the reset mechanism 830, effectively avoiding false counting by the gas meter. When the sampling gear 610 is subjected to large vibration and drives the ratchet 620 to overcome the resistance of the reset mechanism 830 and rotate through one helical tooth of the ratchet 620, the reset mechanism 830 can push the slider 810 to reset. This device can effectively limit the rotation angle of the sampling gear 610, reducing the probability of rotating one full turn in the forward direction and thus reducing the probability of false counting. Due to the locking effect of slider 810, ratchet 620 cannot rotate in reverse, thus preventing sampling gear 610 from rotating in reverse and effectively eliminating the false counting problem caused by the back-and-forth swing of sampling gear 610.

[0086] Example 2

[0087] Figure 7 This is a schematic diagram of the limiting device provided in the embodiments of this application. Figure 2 ,like Figure 7 As shown, the reset mechanism 830 includes a fixed structure 831 and an elastic element 832. The elastic element 832 is connected to the fixed structure 831 and the slider 810 respectively. The elastic element 832 is configured to push one end of the slider 810 to abut against the helical tooth surface of the ratchet 620 to lock the ratchet 620.

[0088] like Figure 7 As shown, the elastic element 832 can be an elastic metal sheet. The elastic element 832 is fixed to the fixed structure 831. When the ratchet 620 rotates forward, pushing the slider 810 to slide to the left, the slider 810 pushes the metal sheet to produce elastic deformation. Figure 7 At the extreme position shown, that is, when the tip of the helical tooth of the ratchet 620 contacts the mating inclined surface 811 of the slider 810, as the ratchet 620 continues to rotate, the metal plate pushes the slider 810 to slide to the right and reset through elastic deformation.

[0089] In actual production, due to production calibration, rework, and deviations in the readings of the mechanical dial 510, it is often necessary to manually adjust the mechanical dial 510 to achieve the factory-required reading. However, the mechanical dial 510 is linked to the sampling gear 610, which is fixed to the ratchet 620. When the ratchet 620 is locked, the sampling gear 610 cannot rotate, thus preventing the mechanical dial 510 from being adjusted. By using an elastic element 832 in the reset mechanism 830, simply pushing the slider 810 causes the elastic element 832 to deform elastically, disengaging the inclined surface 811 of the slider 810 from the helical tooth surface of the ratchet 620. This allows the ratchet 620 to rotate freely, thereby enabling both the sampling gear 610 and the mechanical dial 510 to rotate freely. During this adjustment process, there is no need to disassemble the slider 810, making the operation convenient and quick.

[0090] Example 3

[0091] Figure 8 This is a schematic diagram of the installation of the limiting device provided in the embodiments of this application. Figure 1 ,like Figure 8 As shown, ratchet 620 and sampling gear 610 are mounted on the same shaft, with ratchet 620 below sampling gear 610. The ratchet 620 and sampling gear 610 are mechanically connected, allowing them to rotate synchronously. In this embodiment, the elastic element 832 is a cylindrical spring. One end of the spring is connected to the fixed structure 831, and the other end is connected to the baffle 813 of the slider 810. The baffle 813 limits the movement of the spring. Figure 8 As shown, the gas meter's counter assembly 500 includes a mechanical digit wheel 510 and a counter bracket 520. The mechanical digit wheel 510 is located inside the counter bracket 520. The fixing structure 831 is a fixing bracket, which is mounted on the counter bracket 520. Figure 8 As shown, the fixed bracket has a stepped structure 834 at one end near the sampling gear 610. When the spring pushes the slider 810 to abut against the helical tooth surface of the ratchet 620, the baffle 813 abuts against the side wall of the stepped structure 834, thereby limiting the distance between the slider 810 and the helical tooth surface of the ratchet 620.

[0092] like Figure 8 As shown, the guide mechanism 820 includes at least two latches 821. Figure 8 , Figure 9 There are two buckles 821 in the middle. The buckles 821 are located on the top wall of the stepped structure 834. The buckles 821 have a fixing groove. The two buckles 821 are arranged opposite each other, so that the fixing grooves of the two buckles 821 form a sliding track to accommodate the slider 810.

[0093] Figure 9 This is a schematic diagram of the installation of the limiting device provided in the embodiments of this application. Figure 2 ,like Figure 9As shown, the fixed structure 831 is provided with a first fixed shaft 833, and one end of the spring is sleeved on the first fixed shaft 833.

[0094] The buckle 821 is provided with a limiting rib 822. When the slider 810 is placed in the fixing groove in the buckle 821, the limiting rib 822 abuts against the slider 810, thereby making the slider 810 more stable when sliding in the buckle 821.

[0095] Figure 9 In the middle, the ratchet 620 is placed below the involute teeth of the sampling gear 610, and the involute teeth are connected to the gears of the transmission gear assembly 300 to realize the motion and power transmission from the output gear assembly 200 to the sampling gear 610.

[0096] Figure 10 This is a schematic diagram of the slider structure provided in an embodiment of this application, as shown below. Figure 10 As shown, one end of the slider 810 is provided with a mating inclined surface 811, and the mating inclined surface 811 is as follows: Figures 5 to 9 The helical teeth of the ratchet 620 abut against the ratchet 620 in the manner shown, so that when the ratchet 620 rotates in the forward direction, the helical teeth of the ratchet 620 can push the slider 810. The other end of the slider 810 is provided with a second fixed shaft 812 and a baffle 813. The slider 810 is provided with an arc surface 814, so that the slider 810 and the fixing groove of the buckle 821 are in line contact, which can reduce the resistance when the slider 810 slides.

[0097] Figure 11 This is a schematic diagram of the limiting device provided in the embodiments of this application. Figure 3 ,like Figure 11 As shown, one end of the elastic element 832, i.e., the spring, is sleeved on the first fixed shaft 833 and abuts against the fixed structure 831, while the other end of the spring is sleeved on the second fixed shaft 812 and abuts against the baffle 813. The first fixed shaft 833 and the second fixed shaft 812 are coaxial, thereby achieving reliable fixation of the spring. Furthermore, using a cylindrical spring for the elastic element 832 has the advantage of low cost, and the processing of the first fixed shaft 833, the second fixed shaft 812, and the baffle 813 is also very simple.

[0098] Finally, it should be noted that other embodiments of this utility model will readily occur to those skilled in the art upon consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of this utility model that follow the general principles of this utility model and include common knowledge or customary techniques in the art not disclosed herein, and is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this utility model is limited only by the appended claims.

Claims

1. A gas meter designed to prevent false counting, characterized in that, The gas meter includes a sampling gear set (600) and a braking mechanism (800). The sampling gear set (600) records the gas consumption by the number of rotations; The braking mechanism (800) includes a slider (810) and a reset mechanism (830). The reset mechanism (830) is connected to the slider (810). The reset mechanism (830) pushes one end of the slider (810) to abut against the gear surface of the sampling gear set (600) to lock the sampling gear set (600). When the sampling gear set (600) rotates in the forward direction, the gear surface of the sampling gear set (600) pushes the slider (810) to slide to unlock the sampling gear set (600) until the slider (810) abuts against the tooth tip of the gear of the sampling gear set (600). If the sampling gear set (600) continues to rotate in the forward direction, the reset mechanism (830) pushes the slider (810) to abut against the gear surface of the next gear of the sampling gear set (600).

2. The gas meter according to claim 1, characterized in that, The sampling gear set (600) includes a sampling gear (610) and a ratchet (620), wherein the ratchet (620) is fixed to the sampling gear (610) so that the ratchet (620) and the sampling gear (610) rotate together; The reset mechanism (830) pushes one end of the slider (810) to abut against the helical tooth surface of the ratchet (620) to lock the ratchet (620). When the ratchet (620) rotates in the forward direction, the helical teeth of the ratchet (620) push the slider (810) to slide to unlock the ratchet (620) until the slider (810) abuts against the tip of the helical teeth of the ratchet (620). If the ratchet (620) continues to rotate in the forward direction, the reset mechanism (830) pushes the slider (810) to abut against the next helical tooth surface of the ratchet (620).

3. The gas meter according to claim 2, characterized in that, The slider (810) has a mating inclined surface (811) at one end. The inclination angle of the mating inclined surface (811) is the same as the inclination angle of the helical tooth inclined surface of the ratchet (620) so that the mating inclined surface (811) and the helical tooth inclined surface of the ratchet (620) fit and abut against each other.

4. The gas meter according to claim 2, characterized in that, When the reset mechanism (830) pushes one end of the slider (810) to abut against the helical tooth surface of the ratchet (620) to lock the ratchet (620), if the ratchet (620) rotates in the opposite direction, the side wall of the ratchet (620) abuts against the side wall of the slider (810), so that the thrust direction of the side wall of the ratchet (620) on the side wall of the slider (810) is perpendicular to the sliding direction of the slider (810).

5. The gas meter according to claim 2, characterized in that, The braking mechanism (800) further includes a guide mechanism (820), which has a sliding rail, and the slider (810) is disposed in the sliding rail; The slider (810) has an arc surface (814) on its side, and the arc surface (814) is slidably connected to the sliding track.

6. The gas meter according to claim 5, characterized in that, The reset mechanism (830) includes a fixed structure (831) and an elastic element (832), wherein the elastic element (832) is connected to the fixed structure (831) and the slider (810) respectively; The elastic element (832) is configured to push one end of the slider (810) to abut against the helical tooth surface of the ratchet (620) to lock the ratchet (620). When the ratchet (620) rotates in the forward direction, the helical tooth of the ratchet (620) pushes the slider (810) to slide within the sliding track to unlock the ratchet (620). The slider (810) causes the elastic element (832) to undergo elastic deformation until the slider (810) abuts against the tip of the helical tooth of the ratchet (620). If the ratchet (620) continues to rotate in the forward direction, the elastic element (832) pushes the slider (810) to abut against the next helical tooth surface of the ratchet (620) through elastic deformation.

7. The gas meter according to claim 6, characterized in that, The elastic element (832) is a spring, one end of which is connected to the fixed structure (831), and the other end of which is connected to the slider (810). The fixing structure (831) is provided with a first fixing shaft (833), and one end of the spring is sleeved on the first fixing shaft (833). The other end of the slider (810) is provided with a second fixed shaft (812) and a baffle (813), and the other end of the spring is sleeved on the second fixed shaft (812) and abuts against the baffle (813).

8. The gas meter according to claim 7, characterized in that, The gas meter includes a counter assembly (500), which includes a mechanical digit wheel (510) and a counter bracket (520). The mechanical digit wheel (510) is located inside the counter bracket (520), and the mechanical digit wheel (510) displays the gas consumption reading by rotating. The fixing structure (831) is a fixing bracket, which is mounted on the counter bracket (520).

9. The gas meter according to claim 8, characterized in that, The fixed structure has a stepped structure (834) at one end near the sampling gear. When the spring pushes one end of the slider (810) to abut against the helical tooth surface of the ratchet (620), the baffle (813) abuts against the side wall of the stepped structure (834).

10. The gas meter according to claim 9, characterized in that, The guide mechanism (820) includes at least two latches (821), the latches (821) are disposed on the top wall of the stepped structure (834), and the latches (821) are provided with fixing grooves; The latches (821) are configured such that at least two latches (821) are arranged opposite each other so that the fixing grooves form the sliding track.

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