Gas leakage detection assembly of diaphragm type gas meter

Abstract

The utility model relates to a gas leakage detection assembly of a leather film type gas meter, which comprises a meter core and a character wheel group, the meter core is in transmission connection with the character wheel group through a transmission structure, the transmission structure comprises a transmission shaft, a metal foil is arranged on the outer wall of the transmission shaft, and an angle sensor is arranged on one side of the transmission shaft. The angle sensor detects the resistance of the metal foil through electromagnetic induction, the axial height of the metal foil from the zero position to the right-angle side changes linearly, the metal foil is attached around the outer contour face of the transmission shaft, and the height of the metal foil is in direct proportion to the formed resistance. According to the utility model, the angle sensor is used for carrying out angle detection on the gas driving transmission shaft when gas leakage occurs, so that the angle sensor in the scheme has low requirement on the measurement accuracy of the rotation angle, and the production cost can be controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of gas meter detection, in particular to a gas leakage detection component for a diaphragm gas meter. Background Technique

[0002] The diaphragm gas meter is used to record the gas consumption. With the popularization of gas application, gas leakage often occurs in gas equipment of residential users after the valve is closed due to broken facilities and poor sealing. Since the amount of gas is very small during gas leakage, it is very difficult to monitor gas leakage. Generally speaking, there are the following two problems in gas leakage detection:

[0003] 1. When gas leaks, it is difficult to detect through the dial wheels of the gas meter. The reasons are as follows:

[0004] Generally, the threshold value of gas leakage alarm is 20 liters / hour. Gas flow less than this value is recognized as gas leakage. Currently, each dial wheel of the counter on the gas meter is evenly divided into 10 grids, and one grid rotation of the counter's smallest unit dial wheel represents a gas flow of 1 liter. Therefore, if the counter dial wheel is used for gas leakage detection, one grid of the dial wheel represents an angular change of 36° for the dial wheel rotation. The dial wheel needs to detect an angular change of 2° within 10 seconds, which requires very high precision and reliability for detecting angular changes. To reliably detect angular changes of this precision, the implementation cost is relatively high.

[0005] 2. The current measurement accuracy of angle sensors is not high. Currently, for angle measurement, the pulse method is generally used.

[0006] That is, a magnetic induction component is set on the object to be measured. After the object to be measured rotates one circle, the sensor receives the signal after the object to be measured rotates one circle. However, this method can only receive the signal of one circle rotation and is difficult to accurately measure the specific rotation angle of the object to be measured. In practice, multiple magnetic induction components are set on the object to be measured. Although multiple pulse signals can appear when rotating one circle. Generally speaking, the signals received by the sensor are discrete, and it is actually difficult to perform accurate angle measurement. Content of the Utility Model

[0007] The purpose of the utility model is to solve the technical problem that the existing method of angle detection through the dial wheel requires high precision and high reliability, resulting in a relatively high implementation cost, and provides a gas leakage detection component for a diaphragm gas meter, which can *, and the main idea is:

[0008] A gas leak detection component of a diaphragm gas meter includes a meter core and a wheel assembly. The meter core is connected to the wheel assembly through a transmission structure. The transmission structure includes a transmission shaft. The outer wall of the transmission shaft is provided with a metal foil. One side of the transmission shaft is provided with an angle sensor. The angle sensor uses electromagnetic induction to detect the resistance of the metal foil. In this scheme, a detection component for measuring gas leak detection is set in the transmission structure of the gas meter, and the angle sensor is directly used to detect the rotation angle of the transmission shaft of the transmission structure. By setting the metal foil on the outer wall of the transmission shaft, the angle sensor uses the principle of contactless electromagnetic induction to measure the resistance of the metal foil. After the gas passes through the inside of the gas meter, the diaphragm gas meter converts the linear reciprocating motion of the diaphragm into a circular motion that drives the rotation of its internal synchronous shaft through the internal mechanical structure. The angle sensor measures the resistance of the metal foil on the transmission shaft through the principle of contactless electromagnetic induction. Since the resistance value of the metal foil changes linearly, the angle sensor The sensor detects the resistance difference caused by the rotation of the transmission shaft within a certain period of time and calculates the actual rotation angle. Compared with the prior art that detects the angle change through the smallest unit of the external wheel group, since the transmission structure includes a transmission shaft and a reduction gear group, the transmission shaft is connected to the external wheel group through the reduction gear group, so that the rotation angle of the transmission shaft within the same period of time is ten times the rotation angle of the smallest unit wheel of the wheel group; therefore, when a gas leak occurs, the gas is detected by the angle sensor at the transmission shaft, so that the angle sensor of this scheme has low requirements on the measurement accuracy of the rotation angle, and the production cost can be controlled.

[0009] Preferably, the meter core includes a synchronous shaft for outputting rotational motion, and the transmission shaft is connected to the synchronous shaft. A diaphragm for metering is arranged inside the meter core. When the flowing gas passes through the gas meter, it is blocked by the friction of the pipeline and the mechanism, and the internal gas will generate a pressure difference at both ends of the gas meter inlet and outlet. The diaphragm of the diaphragm gas meter core is driven by this pressure difference to move in the metering chamber, and the gas distribution mechanism is driven to coordinate the gas distribution, so that the movement of the diaphragm of the gas meter core can be continuously reciprocated. The diaphragm gas meter converts the linear reciprocating motion of the diaphragm into the circular motion of the synchronous shaft 1 through the internal mechanical structure, and then drives the coaxially arranged transmission shaft 2 to perform circular motion through the synchronous shaft 1. The transmission shaft and the overall transmission structure together drive the character wheel group to rotate and count.

[0010] Preferably, the transmission shaft is coaxially connected to the synchronous rotating shaft.

[0011] Preferably, the metal foil includes a base, a hypotenuse and a right-angled side, and the base and the hypotenuse form a right-angled triangle structure. The metal foil is set to a triangular structure so that the height of the deceleration foil increases continuously along the direction from the base to the hypotenuse. Under the condition that the thickness of the metal foil is consistent, the height of the metal foil is proportional to the resistance formed by it.

[0012] Preferably, the bottom side and the hypotenuse form a zero position. The axial height from the zero position of the metal foil to the right-angled side changes linearly. The metal foil is attached to the outer contour surface of the transmission shaft, and the zero position of the metal foil is connected end to end with the right-angled side. Since the metal foil has a right-angled triangle structure, when the height of the metal foil continuously increases from the zero position along the hypotenuse to the right-angled side, the resistance of the metal foil on the transmission shaft detected by the angle sensor continuously increases. Connecting the zero position and the right-angled side end to end, setting the zero position and the right-angled side as the starting position and the ending position respectively, the angle sensor receives the largest resistance difference from the zero position to the right-angled side and can identify the beginning and the end of one circle.

[0013] Preferably, the transmission shaft and the angle sensor are arranged on the external mounting plate of the gas meter, and the external mounting plate is provided with a rotating shaft hole for mounting the transmission shaft.

[0014] Preferably, the angle sensor is arranged on the external mounting plate. The angle sensor is located on the radial side of the transmission shaft, and the distance between the angle sensor and the transmission shaft is 1 - 3 cm. Setting the angle sensor at the vacant position of the external mounting plate of the gas meter will not change the original mechanical transmission setting of the gas meter, nor will it change the metering structure of the gas meter, making the structure of this detection component flexible.

[0015] Preferably, the angle sensor is set with a gas leakage alarm threshold, and the angle sensor is electrically connected to the alarm component. When the rotation angle of the transmission shaft detected by the angle sensor within a set time is less than the angle set by the gas leakage alarm threshold, the angle sensor determines that gas leakage has occurred, and the alarm component gives an alarm for gas leakage.

[0016] Preferably, a transmission gear is installed at the end of the transmission shaft opposite to the synchronous rotating shaft, and the transmission gear is used to drive the rotation of the digit wheel set.

[0017] The beneficial effects of the present utility model are as follows:

[0018] When gas leakage occurs, the gas is detected for the angle through the angle sensor at the transmission shaft, so that the requirement for the measurement accuracy of the rotation angle by the angle sensor in this solution is low, and the production cost can be controlled. Brief Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of the present utility model.

[0020] Figure 2 It is a sectional structural diagram of the present utility model.

[0021] Figure 3 It is a schematic structural diagram of the metal foil of the present utility model.

[0022] Figure 4It is the resistance line diagram of the metal foil of the utility model.

[0023] The reference numerals include: 1. synchronous rotating shaft; 2. transmission shaft; 3. external mounting plate; 4. angle sensor; 5. metal foil; 51. bottom edge; 52. hypotenuse; 53. right-angle edge; 54. zero point; 6. alarm component. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the embodiments more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. When the following description refers to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present disclosure. Instead, they are only examples of devices and methods consistent with some aspects of the present disclosure as detailed in the attached claims.

[0025] It should be noted that all actions to obtain signals, information or data in this application are carried out in compliance with the relevant data protection laws and policies of the country where they are located, and with the authorization given by the owner of the corresponding device.

[0026] In the present disclosure, unless otherwise stated, the directional words used, such as "inside" and "outside", are defined according to the corresponding parts' own contours. The terms used in the present disclosure, such as "first" and "second", etc., are used to distinguish one element from another element and do not have order and importance.

[0027] Embodiment 1:

[0028] Basically as attached Figure 1 To Attachment Figure 2 As shown, a gas leakage detection assembly of a diaphragm gas meter includes a meter core and a character wheel group, the meter core is connected to the character wheel group through a transmission structure, the transmission structure includes a transmission shaft 2, the outer wall of the transmission shaft 2 is provided with a metal foil 5, one side of the transmission shaft 2 is provided with an angle sensor 4, the angle sensor 4 uses electromagnetic induction to detect the resistance of the metal foil 5. The meter core includes a synchronous shaft 1 for outputting rotational motion, the transmission shaft 2 is connected to the synchronous shaft 1; the transmission shaft 2 of this embodiment is coaxially connected with the synchronous shaft 1.

[0029] In this solution, a detection component for measuring gas leakage detection is arranged in the transmission structure of the gas meter, and an angle sensor 4 is directly used to detect the rotation angle of the transmission shaft 2 that moves synchronously with the synchronous shaft 1. A metal foil 5 is arranged on the outer wall of the transmission shaft 2, so that the angle sensor 4 measures the resistance of the metal foil 5 by the principle of contactless electromagnetic induction. In this solution, the transmission shaft 2 is connected with the synchronous shaft 1 for synchronous rotation. After the gas passes through the inside of the gas meter, the membrane gas meter converts the linear reciprocating motion of the membrane into a circular motion that drives the synchronous shaft 1 to rotate through the internal mechanical structure, and the angle sensor 4 measures the resistance of the metal foil 5 on the transmission shaft 2 by the principle of contactless electromagnetic induction. Since the resistance value of the metal foil 5 changes linearly, the angle sensor 4 detects the resistance difference caused by the rotation of the transmission shaft 2 within a certain period of time to calculate the actual rotation angle. Compared with the prior art that detects the angle change through the smallest unit of the external wheel group, since the transmission shaft 2 is connected to the external wheel group through the reduction gear group, the rotation angle of the transmission shaft 2 is ten times the rotation angle of the smallest unit wheel of the external wheel assembly 3 within the same period of time; therefore, when a gas leak occurs, the gas passes through the angle sensor 4 at the transmission shaft 2 for angle detection, so that the angle sensor 4 of this scheme has low requirements on the measurement accuracy of the rotation angle, and the production cost can be controlled.

[0030] When the flowing gas passes through the gas meter, it is blocked by the friction of the pipeline and the mechanism, and the internal gas will generate a pressure difference at the inlet and outlet of the gas meter. This pressure difference pushes the diaphragm of the diaphragm gas meter to move in the metering chamber, and drives the gas distribution mechanism to coordinate the gas distribution, so that the movement of the diaphragm of the meter core in the gas meter can be continuous and reciprocating. The diaphragm gas meter converts the linear reciprocating motion of the diaphragm into the circular motion of the synchronous shaft 1 through the internal mechanical structure, and then drives the coaxially arranged transmission shaft 2 to perform circular motion through the synchronous shaft 1. The transmission shaft is used to drive the mechanical roller counter to rotate.

[0031] Each time the diaphragm reciprocates, a certain amount of gas is discharged, and finally the roller rotates through a counting unit to achieve the roller rotation measurement display effect. Different diaphragm gas meters have different rotation volumes, some are 0.8 liters, and some are 1.2 liters. It is equivalent to the reciprocating synchronous shaft 2 in the meter rotating one circle, which represents the gas metering gas as one rotation volume, that is, 0.8 liters, or 1.2 liters. In this embodiment, the rotation volume is 1 liter, and the minimum unit of the mechanical roller counter of the gas meter rotates one circle, which is 1 liter.

[0032] The angle sensor 4 is an electromagnetic induction sensor. Since there is relative movement between the electromagnetic induction sensor and this metal foil, that is, the rotation of the transmission shaft, according to Faraday's law of electromagnetic induction, this relative movement will generate an induced electromotive force in the electromagnetic induction sensor. Specifically, when a certain position of the metal foil approaches or moves away from the electromagnetic induction sensor, it will change the magnetic field distribution around the sensor, thereby generating an induced resistance in the sensor.

[0033] Therefore, by measuring the magnitude of this induced resistance, the electromagnetic induction sensor can indirectly sense the change of the metal foil. And since the change of the metal foil corresponds to the rotation angle of the metal foil, the angle sensor can calculate the accurate rotation angle of the transmission shaft with the metal foil attached by processing this induced signal.

[0034] Embodiment 2:

[0035] As Figure 3 shown, the metal foil 5 of this embodiment includes a bottom edge 51, an inclined edge 52 and a right-angled edge 53, and the bottom edge 51 and the inclined edge 52 form a right-angled triangle structure. The metal foil 5 is set as a triangular structure, so that the height of the metal foil 5 along the direction extending from the bottom edge 51 to the inclined edge 52 continuously increases. Under the condition that the thickness of the metal foil 5 is uniform, the height of the metal foil 5 is proportional to the resistance formed by it.

[0036] As Figure 3 - Figure 4 shown, the bottom edge 51 and the inclined edge 52 form a zero potential point 54. The axial height from the zero potential point 54 of the metal foil 5 to the right-angled edge 53 changes linearly. The metal foil 5 is attached around the outer contour surface of the transmission shaft 2, and the zero potential point 54 of the metal foil 5 is connected end to end with the right-angled edge 53. Since the metal foil 5 is a right-angled triangle structure, when the height of the metal foil 5 increases continuously from the zero potential point 54 along the inclined edge 52 to the right-angled edge, the resistance of the metal foil 5 on the transmission shaft 2 detected by the angle sensor 4 continuously increases. Connecting the zero potential point 54 and the right-angled edge 53 end to end, and setting the zero potential point 54 and the right-angled edge 53 as the starting position and the ending position respectively, the angle sensor 4 receives the largest resistance difference from the zero potential point 54 to the right-angled edge 53 and can identify the beginning and the end of one circle.

[0037] Set up a comparison table of the resistance detected by the angle sensor and the height of the metal foil 5: The angle sensor records the resistances corresponding to different heights of the detected metal foil, and the resistance difference is corresponding to the angle rotation value. During the working process of the angle sensor, it can quickly measure the angle rotation according to the resistance difference.

[0038] During the synchronous rotation of the metal foil 5 of this embodiment with the transmission shaft 2, the angle sensor 4 detects the position of the nearest metal foil 5 on the transmission shaft 2. During the resistance detection, there is a cliff-like change in the resistance at the adjacent positions of the zero point position 54 and the right-angle side 53 of the metal foil during rotation. Then, the connection position of the zero point position 54 and the right-angle side 53 marks the cliff position.

[0039] In one implementation, the transmission shaft 2 rotates, and the height of the detection position of the angle sensor 4 for the metal foil 5 increases from low to high. During the detection time, the first measured resistance is R1, and the second measured resistance is R2. Then, the difference between the two detected resistances is ΔR=(R2 - R1). In another implementation, the height of the detection position of the angle sensor 4 for the metal foil 5 increases from low to high, and the angle sensor 4 senses that the detection position of the metal foil 5 has passed through the cliff position. The resistance value set for the cliff position is the resistance value R0 of the right-angle side 53. Then, during the detection time, the first measured resistance is R1, and the second measured resistance is R2. Then, the difference between the two detected resistances is ΔR=(R0 - R1 + R2).

[0040] Based on this embodiment, the metal foil 5 can also adopt a trapezoidal structure, with two right-angle sides respectively arranged on both sides of the bottom side and the hypotenuse. The two right-angle sides are the low-position right-angle side and the high-position right-angle side respectively. The low-position right-angle side replaces the zero point position. Then, in this implementation, the height of the detection position of the angle sensor 4 for the metal foil 5 increases from low to high, and the angle sensor 4 senses that the detection position of the metal foil 5 has passed through the cliff position. The resistance value set for the cliff position is the resistance value R0 of the high-position right-angle side. Then, during the detection time, the first measured resistance is R1, the second measured resistance is R2, and the resistance value of the low-position right-angle side is R3. Then, the difference between the two detected resistances is ΔR=(R0 - R1 + R3 - R2).

[0041] The angle sensor 4 is arranged on the external mounting plate 3. The angle sensor 4 is located on the radial side of the transmission shaft 2, and the distance between the angle sensor 4 and the transmission shaft 2 is 1 - 3 cm. The angle sensor 4 on one side of the transmission shaft 2 senses and reads the height position of the nearest metal foil. Setting the angle sensor 4 at the vacant position of the external mounting plate 3 of the gas meter will not change the original mechanical transmission setting of the gas meter, nor will it change the metering structure of the gas meter, making the structure of this detection component flexible.

[0042] The metal foil 5 can be made of a metal with good electrical conductivity such as copper foil or aluminum foil.

[0043] Embodiment 3:

[0044] Such as Figure 1As shown, the angle sensor 4 is set with a gas leakage alarm threshold, and the angle sensor 4 is electrically connected to the alarm component 6. When the angle sensor 4 detects that the rotation angle of the transmission shaft 2 within the set time is less than the angle set by the gas leakage alarm threshold, the angle sensor 4 determines that gas leakage has occurred, and the alarm component 6 gives an alarm for gas leakage.

[0045] In this embodiment, the threshold for gas leakage alarm is set to 20 liters per hour. If the gas flow rate less than this value is considered gas leakage; the rotation volume of the transmission shaft is 1 liter, then it is necessary to detect whether the transmission shaft 2 can reach a rotation speed of 20 degrees / 10 seconds.

[0046] In this embodiment, the alarm component 6 adopts an audio alarm method to prompt the occupants of the house that gas leakage has occurred by emitting an audio signal. In addition, the alarm component 6 can also be wirelessly connected to the terminal device. When an alarm signal needs to be sent for gas leakage, the alarm signal is sent to a terminal device such as a mobile phone for prompting.

[0047] A transmission gear is installed at the end of the transmission shaft 2 opposite to the synchronous rotating shaft 1, and the transmission gear is used to drive the word wheel set to rotate.

[0048] The above are only the embodiments of the present invention. Common knowledge such as the specific structure and characteristics in the solution is not described in detail here. It should be noted that for those skilled in the art, without departing from the structure of the present invention, several deformations and improvements can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the implementation effect of the present invention and the practicality of the patent. The protection scope required by this application should be subject to the content of its claims, and the specific implementation manners described in the specification can be used to interpret the content of the claims.

Claims

1. A gas leakage detection component for a diaphragm gas meter, comprising a meter core and a dial wheel group. The meter core is drivingly connected to the dial wheel group through a transmission structure. The transmission structure includes a transmission shaft (2), and is characterized in that: The outer wall of the transmission shaft (2) is provided with a metal foil (5). On one side of the transmission shaft (2), there is an angle sensor (4), and the angle sensor (4) detects the resistance of the metal foil (5) by electromagnetic induction.

2. The gas leakage detection component of a diaphragm gas meter according to claim 1, characterized in that: The watch core includes a synchronous rotating shaft (1) for outputting rotational motion, and the transmission shaft (2) is drivingly connected to the synchronous rotating shaft (1).

3. The gas leakage detection component of a diaphragm gas meter according to claim 2, characterized in that: The transmission shaft (2) is coaxially connected to the synchronous rotating shaft (1).

4. The gas leakage detection component of a diaphragm gas meter according to claim 1, characterized in that: The metal foil (5) includes a bottom edge (51), an inclined edge (52), and a right-angle edge (53), and the bottom edge (51) and the inclined edge (52) form a right-angled triangle structure.

5. The gas leakage detection component of a diaphragm gas meter according to claim 4, characterized in that: The bottom edge (51) and the inclined edge (52) form a zero position (54). The axial height of the zero position (54) of the metal foil (5) from the right-angle edge (53) changes linearly. The metal foil (5) is attached around the outer contour surface of the transmission shaft (2), and the zero position (54) of the metal foil (5) is connected end to end with the right-angle edge (53).

6. The gas leakage detection component of a diaphragm gas meter according to claim 1, characterized in that: The transmission shaft (2) and the angle sensor (4) are arranged on the external mounting plate (3) of the gas meter, and the external mounting plate (3) is provided with a rotating shaft hole for mounting the transmission shaft (2).

7. The gas leakage detection component of a diaphragm gas meter according to claim 6, characterized in that: The angle sensor (4) is arranged on the external mounting plate (3). The angle sensor (4) is located on the radial side of the transmission shaft (2), and the distance between the angle sensor (4) and the transmission shaft (2) is 1 - 3 cm.

8. The gas leakage detection component of a diaphragm gas meter according to claim 1, characterized in that: The angle sensor (4) is set with a gas leakage alarm threshold, and the angle sensor (4) is electrically connected to the alarm component (6).

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