Diaphragm gas meter anti-reversal structure

Abstract

The present invention discloses a diaphragm gas meter anti-reverse rotation structure, comprising a pointer dial and two rocker-link mechanisms for driving the pointer dial to rotate. Each rocker-link mechanism comprises a connecting rod and a rocker arm, wherein the connecting rod's ends are hinged to the pointer dial and the rocker arm, respectively. The rocker arm has a vertical shaft sleeve at one end away from the pointer dial. The pointer dial has an arc-shaped protrusion structure arranged concentrically therewith. The arc-shaped protrusion structure has a climbing angle α in the direction opposite to the metering rotation direction of the pointer dial, and the upper edge of the high end of the arc-shaped protrusion structure has a protruding angle. The lower of the two connecting rods is provided with a stop portion on the side near the protruding angle. The stop portion is wedge-shaped and located within the reverse rotation travel of the protruding angle. This application optimizes the design of existing components in the movement to achieve self-locking of the pointer dial and the connecting rod during reverse rotation, thereby improving the reliability of the anti-reverse structure and ensuring the product yield. It also helps reduce overall processing costs, processing difficulty, and assembly difficulty, facilitating implementation and promotion.

Description

Technical Field

[0001] The invention belongs to the field of gas meters, and in particular relates to an anti-reversal structure of a diaphragm gas meter. Background Art

[0002] A diaphragm gas meter is a mechanically constructed automated instrument. Its driving force is the thrust generated by the pressure generated when gas above atmospheric pressure enters one side of the diaphragm, pushing the diaphragm toward the other side. A sophisticated rocker-link mechanism converts the diaphragm's reciprocating motion into the unidirectional rotation of the dial, which then rotates to produce a metered reading.

[0003] However, if the gas meter is installed in reverse (i.e., the gas inlet pipe is connected to the gas meter outlet, which usually occurs when the gas meter is installed incorrectly or the user secretly installs the gas backward), the pressure relationship on both sides of the membrane is reversed, causing the pointer to rotate in the opposite direction, causing the counter to count backward, from large to small. This not only causes economic losses to the gas company, but also has a negative impact on gas safety and may even lead to safety accidents.

[0004] Based on the above problems, some targeted solutions have appeared on the market. The most traditional one is to directly set a protrusion with a climbing angle on the outer edge of the pointer disk to block the connecting rod with its high point. However, once the air pressure is high, the rotation force of the pointer disk is large, and the connecting rod can easily break out of the limit of the pointer disk. On the other hand, there are machining errors on the end surface of the climbing protrusion, such as Figure 12 As shown, when its end face is tilted away from the direction of the connecting rod, when the two come into contact, the climbing protrusion applies a force F on the connecting rod, and the force F is decomposed into a horizontal impact force F1 and an upward lifting force F2. At this time, the connecting rod can be easily pried up by the lifting force F2 and exceed the limit of the climbing protrusion. At the same time, this structure also exerts a large counter-impact force on the connecting rod. If the high point is set too high, the friction during forward rotation will increase, which will increase wear and shorten the service life, and will also increase momentum loss, affecting the measurement accuracy.

[0005] The patent with document number "CN208091515U" and patent name is "Anti-reverse mechanism of diaphragm gas meter". Based on traditional technology, this patent also sets a protruding angle on the valve cover, and sets a stopper and anti-reverse baffle that cooperate with each other on the bracket to achieve further anti-reverse function. The applicant found in the subsequent research and development process that this type of structure increases the number of parts of the gas meter. At the same time, because the parts are small in size, the required coordination needs to be more precise, which also increases the difficulty of production and assembly. After introducing more factors, the reliability is relatively weak. On the other hand, the structure is located below the indicator panel, which is not convenient for the replacement of parts in the later stage. Therefore, this type of structure is not conducive to promotion. Summary of the Invention

[0006] In view of this, the present invention provides a diaphragm gas meter anti-reversal structure to solve the problems in the prior art of poor reliability of the anti-reversal structure, high production and assembly requirements, and lack of market practicality.

[0007] The technical solution is as follows:

[0008] A diaphragm gas meter anti-reversal structure includes a pointer dial and two groups of rocker arm connecting rod mechanisms for driving the pointer dial to rotate, each group of the rocker arm connecting rod mechanisms includes a connecting rod and a rocker arm, wherein the two ends of the connecting rod are respectively hinged to the pointer dial and the rocker arm, and the end of the rocker arm away from the pointer dial has a vertical shaft sleeve. The key is: the pointer dial has an arc-shaped protrusion structure arranged concentrically therewith, the arc-shaped protrusion structure has a climbing angle in the opposite direction of the metering rotation direction of the pointer dial, and the high-end upper edge of the arc-shaped protrusion structure has a protruding angle, and the lower one of the two connecting rods is provided with a stop portion on the side close to the protruding angle, the stop portion is wedge-shaped, and the stop portion is located on the reverse rotation stroke of the protruding angle.

[0009] With the above solution, when the gas meter movement reverses, the wedge-shaped stopper on the connecting rod and the protruding angle interlock with each other, so that the connecting rod and the pointer dial are interlocked, and continuous reverse rotation will not occur. The protruding angle is set at the high end of the arc-shaped raised structure to ensure that the normal metering forward rotation of the pointer dial will not be affected. In this structure, only the existing structure of the connecting rod and the pointer dial is adjusted, and no new complex components are introduced. The processing and assembly difficulties are both low. At the same time, the pointer dial can be completely locked, and the anti-reverse effect is excellent. It has good reliability and is also conducive to the promotion and application of this structure.

[0010] Preferably, the protruding corner is wedge-shaped, and its inclination angle is greater than the inclination angle of the upper side of the stopper. The above solution is conducive to ensuring the reliability of the mutual locking between the protruding corner and the stopper, and reducing the impact force of the mutual resistance at the moment of contact.

[0011] Preferably, the arc-shaped protrusion structure is in the shape of an arc plate and is integrally formed on the circumferential outer edge of the pointer plate. The above solution has strong impact resistance and is convenient for injection molding.

[0012] Preferably, the arc-shaped protrusion structure is in the form of an arc-shaped strip and is located on the circumferential outer side of the pointer disk, with a gap between the two. Both ends of the arc-shaped protrusion structure are fixedly connected to the pointer disk, and include an inclined portion with a climbing angle and a buffer portion arranged parallel to the pointer disk. The inclined portion and the buffer portion are connected by a vertically arranged connecting portion, and the protruding angle is located at the top of the connecting portion. The inclined portion and the buffer portion are both arc-shaped in the length direction. With the above solution, when the movement is rotating normally and metering, the arc-shaped protrusion structure is more likely to sink under pressure, which can reduce the wear between the metering process and the connecting rod, reduce momentum loss, etc. When the movement is reversed, the segmented structure can buffer the impact of the connecting rod through local deformation, and even reduce the tangential force impact on the pointer disk body, which is conducive to extending its service life.

[0013] Preferably, the central angle of the arc-shaped protrusion is less than 180°. The above solution ensures that the reverse stroke does not exceed half the arc length of the pointer disk, ensuring measurement accuracy and minimizing wear on the connecting rod.

[0014] As a preferred embodiment, the stopper and the connecting rod are integrally injection-molded. The above solution can increase the service life of the stopper and reduce the processing cost of the structure.

[0015] Preferably, the vertical shaft sleeve and the rocker arm are integrally injection-molded, and a weight-reducing groove corresponding to the vertical shaft sleeve is provided on the lower side of the rocker arm end;

[0016] A supporting rib is provided between the vertical shaft sleeve and the weight-reducing groove. The supporting rib is arranged along the radial direction of the vertical shaft sleeve and is located on a side relatively far away from the connecting rod.

[0017] The use of a single-sided support rib structure can fully alleviate the upward warping of the connecting end of the rocker arm and the connecting rod during use. Because injection molding is used, the connecting end of the rocker arm and the connecting rod is more likely to sag and deform under the action of later shrinkage stress, thereby driving the entire connecting rod to sink, which is beneficial to further improve the self-locking effect of the connecting rod and the pointer dial, that is, to improve the overall anti-reverse reliability.

[0018] Preferably, the length of the support rib is 2 mm to 4 mm. With the above solution, in a gas meter structure of general specifications, the support rib has better support and reverse stress effects within this range, which can not only ensure the stability between the column and the rocker arm, but also ensure that the rocker arm and the connecting rod connection have an appropriate reverse force.

[0019] As a preferred embodiment, the thickness of the support rib is consistent with the thickness of the weight-reducing groove. The above solution is conducive to reducing the processing difficulty and ensuring the stability of the vertical shaft sleeve.

[0020] Preferably, the vertical distance tolerance between the upper surface of the rocker arm and the lower end surface of the vertical sleeve is negative. This is because the lower surface of the connecting rod is supported on the upper surface of the rocker arm during installation. When designed according to this tolerance concept during the manufacturing process, it is beneficial to ensure that the connecting rod is always positioned lower than the design position, that is, the design position is artificially lowered, further improving the self-locking reliability of the connecting rod and the pointer plate.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The anti-reversal structure of the diaphragm gas meter provided by the present invention is adopted. This application mainly optimizes the design of the existing components in the movement, the pointer dial, the connecting rod and the rocker arm structure, to achieve self-locking of the pointer dial and the connecting rod during reversal, and effectively improves the self-locking reliability, that is, improves the reliability of the anti-reversal structure, ensures the product yield, and does not introduce new components, which is conducive to reducing the overall processing cost, processing difficulty and assembly difficulty, and is easy to implement and promote. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A perspective view of the present invention;

[0024] Figure 2 for Figure 1 A top view of

[0025] Figure 3 A three-dimensional diagram of an embodiment of a pointer plate;

[0026] Figure 4 for Figure 3 Side view of

[0027] Figure 5 A perspective view of another embodiment of a pointer plate;

[0028] Figure 6 for Figure 5 Top view;

[0029] Figure 7 Schematic diagram of the connecting rod structure;

[0030] Figure 8 It is a three-dimensional diagram of the rocker arm;

[0031] Figure 9 This is the bottom view of the rocker arm;

[0032] Figure 10 This is a cross-sectional view of the rocker arm;

[0033] Figure 11 This is a force analysis diagram when the protruding corner contacts the stopper in this application;

[0034] Figure 12 This is a force analysis diagram when there is a reverse processing error in the climbing protrusion in the prior art. DETAILED DESCRIPTION

[0035] The present invention will be described in further detail below with reference to the accompanying drawings.

[0036] refer to Figures 1 to 11 The anti-reversal structure of the diaphragm gas meter shown mainly includes a pointer dial 1 and two sets of rocker arm connecting rod mechanisms for driving the pointer dial 1 to rotate. Each set of rocker arm connecting rod mechanisms includes a connecting rod 2 and a rocker arm 3, wherein the two ends of the connecting rod 2 are hinged to the pointer dial 1 and the rocker arm 3 respectively. The end of the rocker arm 3 away from the pointer dial 1 has a vertical shaft sleeve 30. When installed, a metal shaft is fixed in the vertical shaft sleeve 30 and extends into the metering chamber of the gas meter and is acted upon by the diaphragm through the folding plate. When gas enters, the diaphragm fluctuates and drives the vertical shaft sleeve to rotate, thereby linking the connecting rod 2 and the pointer dial 1 through the rocker arm 3 to realize gas metering.

[0037] In order to solve the problems of poor reliability or complex structure in preventing the pointer disk 1 from reversing, the present invention provides an arc-shaped protrusion structure 10 on the pointer disk 1, and the arc-shaped protrusion structure 10 is arranged concentrically with the pointer disk 1. The arc-shaped protrusion structure 10 measures the rotation direction of the pointer disk 1 (in Figure 2 For example, the pointer disk 1 has a climbing angle α in the opposite direction (counterclockwise rotation is the positive direction of measurement, and counterclockwise rotation is the reverse direction), and the high-end upper edge of the arc-shaped protrusion structure 10 has a protrusion 100, and the protrusion 100 extends along the climbing direction of the arc-shaped protrusion structure 10. The lower one of the two connecting rods 2 is provided with a stop portion 20 on the side close to the protrusion 100. The stop portion 20 is wedge-shaped and is located on the reverse rotation stroke of the protrusion 100. In this way, once the pointer disk 1 reverses, when the stop portion 20 contacts the protrusion 100, the two will inevitably form a mutually locked posture, thereby preventing it from continuing to reverse, and has excellent anti-reversal reliability.

[0038] In this embodiment, the protruding corner 100 is wedge-shaped. As shown in the figure, the upper surface of the arc-shaped protruding structure 10 on the upper side of the protruding corner 100 continues to climb the pressure plate, and the lower side is an inclined surface. The lower surface of the stop portion 20 is basically flush with the lower surface of the connecting rod 2, and the upper surface is an inclined surface. The inclination angle of the lower side of the protruding corner 100 is greater than the inclination angle of the upper side of the stop portion 20. The vertical sections of the protruding corner 100 and the stop portion 20 are both roughly right-angled trapezoidal in shape, and have greater supporting strength.

[0039] like Figure 3 or Figure 4 In the first embodiment of the pointer dial 1 shown, the arc-shaped protrusion structure 10 is in the shape of an arc plate and is integrally formed on the circumferential outer edge of the pointer dial 1. Relatively speaking, the impact generated when the pointer dial 1 rotates forward is smaller and has a larger force radius. When the connecting rod 2 and the arc-shaped protrusion structure 10 are in contact, the pointer dial 1 as a whole is more likely to deflect due to tolerance, thereby alleviating the mutual wear between the connecting rod 2 and the arc-shaped protrusion structure 10.

[0040] refer to Figure 5 and Figure 6 The second embodiment of the pointer dial 1 is shown, in which the arc-shaped protrusion structure 10 is an arc-shaped strip structure and is located on the circumferential outside of the pointer dial 1, with a gap between the two. The two ends of the arc-shaped protrusion structure 10 are fixedly connected to the pointer dial 1, and it includes an inclined portion 101 with a climbing angle α and a buffer portion 102 arranged parallel to the pointer dial 1, that is, the buffer portion 102 is flush with the pointer dial 1, and the inclined portion 101 and the buffer portion 102 are connected by a vertically arranged connecting portion 103, and the protruding angle 100 is located at the top of the connecting portion 103. The inclined portion 101 and the buffer portion 102 are both arc-shaped in the length direction, and both are arranged concentrically with the pointer dial 1 in the horizontal projection.

[0041] This allows the arc-shaped protrusion structure 10 to have a certain degree of freedom in the height direction. When the pointer dial 1 rotates forward for measurement, when the connecting rod 2 contacts the arc-shaped protrusion structure 10, the arc-shaped protrusion structure 10 is more likely to sink to reduce the wear between the two. On the other hand, when the pointer dial 1 reverses, the protrusion 100 contacts the stopper 20 at the moment, and the arc-shaped protrusion structure 10 itself can be deformed to cushion the impact on the pointer dial 1, thereby extending the overall service life.

[0042] In the present application, the central angle corresponding to the arc-shaped protruding structure 10 is less than 180°, that is, the corresponding circumference of the pointer plate 1 is less than half, usually between 1 / 4 and 1 / 2 of the circumference.

[0043] In this application, in order to save processing costs, improve assembly efficiency and ensure structural reliability, the stop part 20 and the connecting rod 2 are injection molded as one piece. Of course, in addition to this, the stop part 20 can also be processed separately and finally fixed to the connecting rod 2 by hot melting or bonding.

[0044] In addition to optimizing the structure of the connecting rod 2 and the pointer plate 1, the present application also improves the structure of the rocker arm 2, such as Figures 8 to 10 As shown, the vertical shaft sleeve 30 and the rocker arm 3 are integrally injection molded, and the lower side of the end of the rocker arm 3 has a weight-reducing groove 31 corresponding to the vertical shaft sleeve 30. A support rib 32 is provided between the vertical shaft sleeve 30 and the weight-reducing groove 31. The support rib 32 is arranged along the radial direction of the vertical shaft sleeve 30 and is located relatively away from the connecting rod 2.

[0045] In practice, the length L of the support rib 32 is preferably 2 mm to 4 mm, and its thickness is consistent with the thickness of the weight reduction groove 31. On the other hand, the vertical distance H between the upper surface of the rocker arm 3 and the lower end surface of the vertical shaft sleeve 30 has a negative tolerance. Taking the G16 general table as an example, the length L of the support rib 32 is 3 mm, and the vertical distance H between the upper surface of the rocker arm 3 and the lower end surface of the vertical shaft sleeve 30 is This can effectively prevent the rocker arm 3 from tilting up, and is conducive to setting the height of the protruding angle 100 within a reasonable range, which can meet the self-locking reliability of the connecting rod 2 and the pointer plate 1, and avoid the position of the protruding angle 100 being too high to increase the wear on the connecting rod 2 during the forward metering process.

[0046] refer to Figures 1 to 11 By adopting the anti-reversal structure of the diaphragm gas meter of the present application, the pointer dial 1 of both embodiments can be injection molded and then cut to form the protruding corner 100 or the arc-shaped protrusion structure 10, and the stop portion 20 and the connecting rod 2 are injection molded as one piece. Relatively speaking, the processing cost and processing difficulty will not increase too much, and at the same time, no additional steps will be added in the assembly, which is convenient for operation.

[0047] During use, the self-locking structure is formed by the contact between the protruding corner 100 and the stopper 20 to achieve anti-reverse. The working force analysis is as follows: Figure 11 As shown, when the protruding corner 100 contacts the stopper 20, a force F4 is applied to the connecting rod. The force F4 is divided into a horizontal impact force F5 and a downward force F6. As can be seen from the comparison of the figures, the horizontal impact force F5 is significantly reduced compared with the traditional one, and is mainly converted into a downward force F6. The downward force F6 can press the connecting rod 2 downward as a whole to prevent it from going over the protruding corner 100, and has good reliability.

[0048] At the same time, the structural optimization of the rocker arm 3 can improve the reliability of the self-locking formed by the contact between the protruding corner 100 and the stop part 20, and prevent the rocker arm 3 from tilting up and causing the protruding corner 100 and the stop part 20 to be misaligned. In addition, because the pointer dial has the largest volume among all the rotating parts in the movement, when the gas meter is stopped during reverse rotation, the buffer angle of the pointer dial 1 is the smallest under the same buffer stroke, and the moving parts stop moving more smoothly.

[0049] Finally, it should be noted that the above description is only a preferred embodiment of the present invention. Under the guidance of the present invention, ordinary technicians in this field can make various similar expressions without violating the purpose and claims of the present invention. Such changes fall within the scope of protection of the present invention.

Claims

1. A diaphragm gas meter anti-reverse structure, comprising a pointer disk (1), and two sets of rocker arm connecting rod mechanisms for driving the pointer disk (1) to rotate, each set of the rocker arm connecting rod mechanisms comprising a connecting rod (2) and a rocker arm (3), wherein both ends of the connecting rod (2) are hinged to the pointer disk (1) and the rocker arm (3), respectively, and the end of the rocker arm (3) away from the pointer disk (1) has a vertical shaft sleeve (30), characterized in that: The pointer disk (1) has an arc-shaped protruding structure (10) arranged concentrically therewith, the arc-shaped protruding structure (10) has a climbing angle α in the direction opposite to the metering rotation direction of the pointer disk (1), and the upper edge of the high end of the arc-shaped protruding structure (10) has a protruding angle (100), and a stopper (20) is provided on the side of the lower connecting rod (2) of the two connecting rods (2) close to the protruding angle (100), and the stopper (20) is wedge-shaped, and the stopper (20) is located on the reverse rotation stroke of the protruding angle (100); The arc-shaped protrusion structure (10) is an arc-shaped strip structure and is located on the circumferential outer side of the pointer disk (1), with a gap between the two. Both ends of the arc-shaped protrusion structure (10) are fixedly connected to the pointer disk (1). The arc-shaped protrusion structure (10) includes an inclined portion (101) having a climbing angle α and a buffer portion (102) arranged parallel to the pointer disk (1). The inclined portion (101) and the buffer portion (102) are connected via a vertically arranged connecting portion (103). The protruding angle (100) is located at the top of the connecting portion (103). The inclined portion (101) and the buffer portion (102) are both arc-shaped in the length direction. The vertical shaft sleeve (30) and the rocker arm (3) are integrally injection-molded, and a weight-reducing groove (31) corresponding to the vertical shaft sleeve (30) is provided on the lower side of the end of the rocker arm (3); A support rib (32) is provided between the vertical shaft sleeve (30) and the weight-reducing groove (31), and the support rib (32) is arranged along the radial direction of the vertical shaft sleeve (30) and is located on a side relatively far away from the connecting rod (2).

2. The anti-reversal structure of the diaphragm gas meter according to claim 1, characterized in that: The protruding corner (100) is wedge-shaped, and its inclination angle is greater than the inclination angle of the upper side of the stop portion (20).

3. The anti-reversal structure of a diaphragm gas meter according to claim 1 or 2, characterized in that: The central angle corresponding to the arc-shaped protruding structure (10) is less than 180°.

4. The anti-reversal structure of a diaphragm gas meter according to claim 1, characterized in that: The stopper (20) and the connecting rod (2) are integrally injection-molded.

5. The anti-reversal structure of a diaphragm gas meter according to claim 1, characterized in that: The length of the supporting rib (32) is 2 mm to 4 mm.

6. The anti-reversal structure of a diaphragm gas meter according to claim 1 or 5, characterized in that: The thickness of the support rib (32) is consistent with the thickness of the weight-reducing groove (31).

7. The anti-reversal structure of a diaphragm gas meter according to claim 1 or 5, characterized in that: The vertical distance tolerance between the upper surface of the rocker arm (3) and the lower end surface of the vertical shaft sleeve (30) is negative.

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