Method and system for determining vertical dimension chain of end face gap of gear flowmeter

Abstract

The invention provides a method and system for determining a vertical dimension chain of an end face gap of a gear flowmeter. The method for determining the vertical dimension chain of the end face gap of the gear flowmeter comprises the steps that the gear height and the initial end face gap of the gear flowmeter are obtained; the initial end face gap is adjusted, the optimal end face gap is determined, and the cavity depth is determined according to the optimal end face gap and the gear height; determining a gear height tolerance zone and a cavity depth tolerance zone according to the optimal end face gap; determining the gasket thickness and the gasket tolerance according to the optimal end face gap; the internal height is determined according to the gear height, the gasket thickness and the gasket tolerance, and the end face gap of the gear flowmeter is checked according to the containing cavity depth and the internal height. According to the technical scheme, the vertical dimension chain of the end face gap of the gear flow meter can be quickly confirmed, the dependence of key parameters on simulation calculation is reduced, and the design period is effectively shortened.

Description

Technical Field

[0001] The present application relates to the technical field of gear flowmeter design, and in particular to a method and system for determining a vertical dimension chain of an end face clearance of a gear flowmeter. Background Art

[0002] At present, the internal leakage of gear flowmeters is the most important factor affecting the measurement accuracy of flowmeters, and the internal leakage of gear flowmeters mainly comes from gear end face clearance leakage, radial leakage of the tooth top circle, and tooth side clearance leakage. Among these internal leakages, the gear end face clearance leakage (hereinafter referred to as end face leakage) has the most serious impact, accounting for as much as 70% to 80%, so the value of the end face clearance is particularly important. Simulation engineers usually use the above-mentioned influencing factors as variables for optimization analysis and ultimately find the optimal values ​​of the relevant parameters. However, as the number of parameters in the optimization model increases and the model becomes more complex, the initial values ​​of the variable parameters become extremely important, because from the perspective of optimization, if the initial value is not selected reasonably, the model will fall into the local optimal value and fail to find the global optimal value, or even if the global optimal value is found, it will consume a lot of computing resources and working time. Summary of the invention

[0003] This application aims to solve or improve the above technical problems.

[0004] To this end, the first purpose of the present application is to provide a method for determining the vertical dimension chain of the end face clearance of a gear flowmeter.

[0005] The second object of the present application is to provide a system for determining the vertical dimension chain of the end face clearance of a gear flowmeter.

[0006] The third object of the present application is to provide a system for determining the vertical dimension chain of the end face clearance of a gear flowmeter.

[0007] The fourth object of the present application is to provide a readable storage medium.

[0008] To achieve the first purpose of the present application, the technical solution of the first aspect of the present application provides a method for determining the vertical dimension chain of the end face clearance of a gear flowmeter, including: obtaining the gear height and initial end face clearance of the gear flowmeter; adjusting the initial end face clearance to determine the optimal end face clearance, and determining the cavity depth according to the optimal end face clearance and the gear height; determining the gear height tolerance band and the cavity depth tolerance band according to the optimal end face clearance; determining the gasket thickness and gasket tolerance according to the optimal end face clearance; determining the internal height according to the gear height, gasket thickness and gasket tolerance, and calibrating the end face clearance of the gear flowmeter according to the cavity depth and the internal height.

[0009] According to the method for determining the vertical dimension chain of the end face clearance of the gear flowmeter provided in the present application, the gear height and initial end face clearance of the gear flowmeter are first obtained. Then the initial end face clearance is adjusted to determine the optimal end face clearance, and the cavity depth is determined according to the optimal end face clearance and the gear height. Then the gear height tolerance band and the cavity depth tolerance band are determined according to the optimal end face clearance. The gasket thickness and gasket tolerance are determined according to the optimal end face clearance. Finally, the internal height is determined according to the gear height, gasket thickness and gasket tolerance, and the end face clearance of the gear flowmeter is checked according to the cavity depth and the internal height. By determining the core dimension, that is, the size of the end face clearance, the design is carried out around the typical value of the end face clearance of the gear flowmeter, the acceptable range of the end face clearance is determined, the basic dimensions of the structure are deduced with the optimal end face clearance, and the structural tolerance is used to supplement the remaining clearance range. The vertical dimension chain of the end face clearance of the gear flowmeter can be quickly confirmed, the dependence of key parameters on simulation calculations is reduced, and the design cycle is effectively reduced.

[0010] In addition, the technical solution provided by this application may also have the following additional technical features: In the above technical solution, the gear height and initial end face clearance of the gear flowmeter are obtained, including: obtaining the gear height and the optimal single-side end face clearance range of the gear flowmeter; determining the initial upper end face clearance and the initial lower end face clearance according to the optimal single-side end face clearance range, and the optimal single-side end face clearance range is 30μm-40μm.

[0011] In this technical solution, the gear height and initial end face clearance of the gear flowmeter are obtained by first obtaining the gear height and the optimal single-side end face clearance range of the gear flowmeter. Then, the initial upper end face clearance and the initial lower end face clearance are determined according to the optimal single-side end face clearance range. Specifically, the single-side end face clearance range is generally between 10μm and 100μm, while the optimal single-side end face clearance range is often between 30μm and 40μm. When a small gap is selected, a more precise equipment process is required, and the matching precision gasket must also control a smaller manufacturing error, otherwise it is easy to cause the end cover to not be completely fastened. Therefore, this choice is not conducive to the subsequent assembly and debugging. When a large gap is selected, although there is a risk of increasing the leakage, the choice of the gap is still within a reasonable range, the risk is controllable, and the difficulty of subsequent assembly and debugging is reduced. Therefore, considering all factors, the initial upper end face clearance and the initial lower end face clearance take a large gap value of 40μm.

[0012] In the above technical solution, the initial end face clearance is adjusted to determine the optimal end face clearance, and the cavity depth is determined based on the optimal end face clearance and the gear height, including: adjusting the initial upper end face clearance to determine the optimal upper end face clearance; adjusting the initial lower end face clearance to determine the optimal lower end face clearance; determining the cavity depth based on the optimal upper end face clearance, the optimal lower end face clearance and the gear height.

[0013] In this technical solution, the initial end face clearance is adjusted to determine the optimal end face clearance, and the cavity depth is determined according to the optimal end face clearance and the gear height. Specifically, the initial upper end face clearance is first adjusted to determine the optimal upper end face clearance. Then the initial lower end face clearance is adjusted to determine the optimal lower end face clearance. Finally, the cavity depth is determined according to the optimal upper end face clearance, the optimal lower end face clearance and the gear height. Among them, the size of the optimal upper end face clearance and the optimal lower end face clearance are equal.

[0014] In the above technical solution, the gear height tolerance zone is a negative tolerance zone, and the cavity depth tolerance zone is a positive tolerance zone.

[0015] In this technical solution, the gear height tolerance zone is a negative tolerance zone, and the cavity depth tolerance zone is a positive tolerance zone. It is understandable that, conventionally, a symmetrical tolerance zone can be used, but in practice, such an approach may cause the overall height of the gear and gasket to exceed the cavity depth. In order to avoid this possibility and reduce the design difficulty, a combination strategy of using a negative tolerance zone for the gear height and a positive tolerance zone for the cavity depth is adopted.

[0016] In the above technical solution, the gasket thickness and gasket tolerance are determined according to the optimal end surface gap, including: determining the first gasket thickness and the second gasket thickness according to the optimal upper end surface gap; determining the gasket tolerance according to the first gasket thickness and the second gasket thickness.

[0017] In this technical solution, the gasket thickness and gasket tolerance are determined according to the optimal end face gap, specifically, the first gasket thickness and the second gasket thickness are determined according to the optimal upper end face gap. The gasket tolerance is determined according to the first gasket thickness and the second gasket thickness. Among them, the common precision gasket thickness is 0.01mm-0.2mm and other specifications, and its manufacturing tolerance varies from 0.002mm to 0.006mm. To install precision gaskets of corresponding sizes at the end face gap, at least two layers of precision gaskets need to be placed. Large gaskets are used in the bottom layer to optimize the contact state and make the force more uniform. Small gaskets are used in the upper layer to reduce the contact area under sliding friction, thereby reducing the sliding friction force, and the superposition of layers of precision gaskets means the superposition of dimensional errors here.

[0018] In the above technical solution, the internal height is determined according to the gear height, gasket thickness and gasket tolerance, and the end face clearance of the gear flowmeter is checked according to the cavity depth and the internal height, including: determining the total height after combination according to the gear height, the optimal upper end face clearance and the gasket tolerance, and determining the total depth after combination according to the cavity depth; and checking the end face clearance of the gear flowmeter according to the total height and the total depth.

[0019] In this technical solution, the internal height is determined according to the gear height, gasket thickness and gasket tolerance, and the end face clearance of the gear flowmeter is checked according to the cavity depth and internal height. Specifically, the total height after combination is first determined according to the gear height, the optimal upper end face clearance and gasket tolerance, and the total depth after combination is determined according to the cavity depth. Then, the end face clearance of the gear flowmeter is checked according to the total height and total depth to determine whether the optimal end face clearance meets the design requirements.

[0020] In the above technical solution, the end face clearance of the gear flowmeter is calibrated according to the total height and total depth, including: judging whether the difference between the total depth and the total height is greater than zero; if the difference between the total depth and the total height is greater than zero, the optimal end face clearance, gear height, cavity depth, gear height tolerance zone and cavity depth tolerance zone meet the design requirements.

[0021] In this technical solution, the end face clearance of the gear flowmeter is checked according to the total height and total depth, specifically to determine whether the difference between the total depth and the total height is greater than zero. If the difference between the total depth and the total height is greater than zero, that is, in the extreme case, there will still be no gear overheight phenomenon, then the optimal end face clearance, gear height, cavity depth, gear height tolerance zone and cavity depth tolerance zone meet the design requirements.

[0022] To achieve the second purpose of the present application, the technical solution of the second aspect of the present application provides a gear flowmeter end face clearance vertical dimension chain determination system, including: an acquisition module, used to obtain the gear height and initial end face clearance of the gear flowmeter; a first determination module, used to adjust the initial end face clearance, determine the optimal end face clearance, and determine the cavity depth according to the optimal end face clearance and the gear height; a second determination module, used to determine the gear height tolerance band and the cavity depth tolerance band according to the optimal end face clearance; a third determination module, used to determine the gasket thickness and gasket tolerance according to the optimal end face clearance; a verification module, used to determine the internal height according to the gear height, gasket thickness and gasket tolerance, and verify the end face clearance of the gear flowmeter according to the cavity depth and the internal height.

[0023] According to the gear flowmeter end face clearance vertical dimension chain determination system provided in the present application, it includes an acquisition module, a first determination module, a second determination module, a third determination module and a verification module. Among them, the acquisition module is used to obtain the gear height and initial end face clearance of the gear flowmeter. The first determination module is used to adjust the initial end face clearance, determine the optimal end face clearance, and determine the cavity depth according to the optimal end face clearance and the gear height. The second determination module is used to determine the gear height tolerance band and the cavity depth tolerance band according to the optimal end face clearance. The third determination module is used to determine the gasket thickness and gasket tolerance according to the optimal end face clearance. The verification module is used to determine the internal height according to the gear height, gasket thickness and gasket tolerance, and verify the end face clearance of the gear flowmeter according to the cavity depth and the internal height. By determining the core dimension, i.e. the size of the end face clearance, developing the design around the typical value of the end face clearance of the gear flowmeter, determining the acceptable range of the end face clearance, and using the optimal end face clearance to derive the basic dimensions of the structure, and using the structural tolerance to supplement the remaining clearance range, the vertical dimension chain of the end face clearance of the gear flowmeter can be quickly confirmed, reducing the dependence of key parameters on simulation calculations and effectively reducing the design cycle.

[0024] To achieve the third purpose of the present application, the technical solution of the third aspect of the present application provides a system for determining the vertical dimension chain of the end face clearance of a gear flowmeter, comprising: a memory and a processor, wherein the memory stores programs or instructions that can be run on the processor, and when the processor executes the program or instructions, it implements the method for determining the vertical dimension chain of the end face clearance of a gear flowmeter according to any one of the technical solutions of the first aspect, thereby having the technical effects of any of the technical solutions of the first aspect, which will not be repeated here.

[0025] In order to achieve the fourth purpose of the present application, the technical solution of the fourth aspect of the present application provides a readable storage medium on which a program or instruction is stored. When the program or instruction is executed by the processor, the steps of the method for determining the vertical dimension chain of the end face clearance of the gear flowmeter of any one of the technical solutions of the first aspect are implemented, and thus it has the technical effect of any one of the technical solutions of the first aspect mentioned above, which will not be repeated here.

[0026] Additional aspects and advantages of the present application will become apparent in the following description or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 This is a schematic flow chart of the steps of a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Figure 2This is a schematic flow chart of the steps of a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Figure 3 This is a schematic flow chart of the steps of a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Figure 4 This is a schematic flow chart of the steps of a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Figure 5 This is a schematic flow chart of the steps of a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Figure 6 This is a schematic flow chart of the steps of a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Figure 7 This is a schematic structural block diagram of a system for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Figure 8 This is a schematic structural block diagram of a system for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Fig. 9 A schematic diagram of a gear flowmeter medium leakage schematic interval of a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Fig.10 A schematic diagram of a gear flowmeter medium leakage schematic interval of a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application; Fig.11 This is a schematic diagram of the overall structure of the gear flowmeter according to a method for determining the vertical dimension chain of the end face clearance of a gear flowmeter according to an embodiment of the present application.

[0028] in, Figure 7 , Figure 8 and Fig.11 The corresponding relationship between the reference numerals and component names in the figure is: 10: Gear flow meter end face clearance vertical dimension chain determination system; 110: Acquisition module; 120: First determination module; 130: Second determination module; 140: Third determination module; 150: Verification module; 20: Gear flow meter end face clearance vertical dimension chain determination system; 300: Memory; 400: Processor; 510: Housing; 520: Precision gasket; 530: Cylindrical gear; 540: Cavity end cover. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0031] Refer to the following Figures 1 to 11 Describes a method and system for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to some embodiments of the present application, and a readable storage medium.

[0032] like Figure 1 As shown, an embodiment of the first aspect of the present application provides a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter, comprising the following steps: Step S102: obtaining the gear height and initial end face clearance of the gear flowmeter; Step S104: adjusting the initial end face clearance to determine the optimal end face clearance, and determining the cavity depth according to the optimal end face clearance and the gear height; Step S106: determining the gear height tolerance zone and the cavity depth tolerance zone according to the optimal end face clearance; Step S108: determining the gasket thickness and gasket tolerance according to the optimal end face gap; Step S110: Determine the internal height according to the gear height, gasket thickness and gasket tolerance, and calibrate the end face clearance of the gear flowmeter according to the cavity depth and the internal height.

[0033] According to the method for determining the vertical dimension chain of the end face clearance of the gear flowmeter provided in this embodiment, first obtain the gear height and initial end face clearance of the gear flowmeter. Then adjust the initial end face clearance to determine the optimal end face clearance, and determine the cavity depth according to the optimal end face clearance and the gear height. Then determine the gear height tolerance band and the cavity depth tolerance band according to the optimal end face clearance. Determine the gasket thickness and gasket tolerance according to the optimal end face clearance. Finally, determine the internal height according to the gear height, gasket thickness and gasket tolerance, and check the end face clearance of the gear flowmeter according to the cavity depth and the internal height. By determining the core dimension, that is, the size of the end face clearance, design is carried out around the typical value of the end face clearance of the gear flowmeter, determine the acceptable range of the end face clearance, derive the basic dimensions of the structure with the optimal end face clearance, and use the structural tolerance to supplement the remaining clearance range. The vertical dimension chain of the end face clearance of the gear flowmeter can be quickly confirmed, reducing the dependence of key parameters on simulation calculations and effectively reducing the design cycle.

[0034] It can be understood that by simplifying first and then perfecting, the simplified design is used to verify possible variables, rather than introducing possible variables into the system as design inputs at the same time. The complexity of the assembly model is fully simplified, the interference of various geometric tolerances on the initial size is eliminated, and the original model is quickly formed. Tolerances are added gradually, and under reasonable technical requirements, it is ensured that after the introduction of various tolerance variables, the rationality of the end face clearance value can still be met.

[0035] like Figure 2 As shown, according to a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application, the gear height and initial end face clearance of the gear flowmeter are obtained, including the following steps: Step S202: obtaining the gear height and the optimal single-side end face clearance range of the gear flowmeter; Step S204: determining an initial upper end surface gap and an initial lower end surface gap according to an optimal single-side end surface gap range, wherein the optimal single-side end surface gap range is 30 μm-40 μm.

[0036] In this embodiment, obtaining the gear height and initial end face clearance of the gear flowmeter specifically involves first obtaining the gear height and optimal single-side end face clearance range of the gear flowmeter. Then, the initial upper end face clearance and the initial lower end face clearance are determined according to the optimal single-side end face clearance range. Specifically, the single-side end face clearance range is generally between 10μm and 100μm, while the optimal single-side end face clearance range is often between 30μm and 40μm. When a small clearance is selected, a more precise equipment process is required, and the matching precision gasket must also control a smaller manufacturing error, otherwise it is easy to cause the end cover to not be completely buckled. Therefore, this choice is not conducive to the subsequent assembly and debugging. When a large clearance is selected, although there is a risk of increasing the leakage, the choice of the clearance is still within a reasonable range, the risk is controllable, and the difficulty of subsequent assembly and debugging is reduced. Therefore, considering all factors, the initial upper end face clearance and the initial lower end face clearance take a large clearance value of 40μm.

[0037] like Figure 3 As shown, according to a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application, the initial end face clearance is adjusted to determine an optimal end face clearance, and the cavity depth is determined according to the optimal end face clearance and the gear height, specifically comprising the following steps: Step S302: adjusting the initial upper end surface clearance to determine the optimal upper end surface clearance; Step S304: adjusting the initial lower end surface clearance to determine the optimal lower end surface clearance; Step S306: Determine the cavity depth according to the optimal upper end surface clearance, the optimal lower end surface clearance and the gear height.

[0038] In this embodiment, the initial end surface clearance is adjusted to determine the optimal end surface clearance, and the cavity depth is determined according to the optimal end surface clearance and the gear height. Specifically, the initial upper end surface clearance is first adjusted to determine the optimal upper end surface clearance. Then the initial lower end surface clearance is adjusted to determine the optimal lower end surface clearance. Finally, the cavity depth is determined according to the optimal upper end surface clearance, the optimal lower end surface clearance and the gear height. Among them, the size of the optimal upper end surface clearance and the optimal lower end surface clearance is equal.

[0039] In some embodiments, the gear height tolerance zone is optionally a negative tolerance zone, and the cavity depth tolerance zone is a positive tolerance zone. It is understandable that conventionally, a symmetrical tolerance zone can be used, but in practice, such an approach may cause the overall height of the gear and the gasket to exceed the cavity depth. In order to avoid this possibility and reduce the design difficulty, a combination strategy of using a negative tolerance zone for the gear height and a positive tolerance zone for the cavity depth is adopted.

[0040] like Figure 4 As shown, according to a method for determining a vertical dimension chain of a gear flowmeter end face clearance according to an embodiment of the present application, the gasket thickness and gasket tolerance are determined according to the optimal end face clearance, including the following steps: Step S402: determining the first gasket thickness and the second gasket thickness according to the optimal upper end surface gap; Step S404: determining the gasket tolerance according to the first gasket thickness and the second gasket thickness.

[0041] In this embodiment, the gasket thickness and gasket tolerance are determined according to the optimal end face gap, specifically, the first gasket thickness and the second gasket thickness are determined according to the optimal upper end face gap. The gasket tolerance is determined according to the first gasket thickness and the second gasket thickness. Among them, the common precision gasket thickness is 0.01mm-0.2mm and other specifications, and its manufacturing tolerance varies from 0.002mm to 0.006mm. Precision gaskets of corresponding sizes are installed at the end face gap. At least two layers of precision gaskets need to be placed. Large gaskets are used in the bottom layer to optimize the contact state and make the force more uniform. Small gaskets are used in the upper layer to reduce the contact area under sliding friction, thereby reducing the sliding friction force, and the superposition of layers of precision gaskets means the superposition of dimensional errors here.

[0042] like Figure 5 As shown, according to a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application, the internal height is determined according to the gear height, the gasket thickness and the gasket tolerance, and the end face clearance of the gear flowmeter is checked according to the cavity depth and the internal height, specifically comprising the following steps: Step S502: determining the total height after assembly according to the gear height, the optimal upper end surface clearance, and the gasket tolerance, and determining the total depth after assembly according to the cavity depth; Step S504: Check the end face clearance of the gear flowmeter according to the total height and the total depth.

[0043] In this embodiment, the internal height is determined according to the gear height, the gasket thickness and the gasket tolerance, and the end face clearance of the gear flowmeter is checked according to the cavity depth and the internal height. Specifically, the total height after combination is first determined according to the gear height, the optimal upper end face clearance and the gasket tolerance, and the total depth after combination is determined according to the cavity depth. Then, the end face clearance of the gear flowmeter is checked according to the total height and the total depth to determine whether the optimal end face clearance meets the design requirements.

[0044] like Figure 6 As shown, according to a method for determining a vertical dimension chain of an end face clearance of a gear flowmeter according to an embodiment of the present application, the end face clearance of the gear flowmeter is checked according to the total height and the total depth, specifically comprising the following steps: Step S602: determining whether the difference between the total depth and the total height is greater than zero; Step S604: If the difference between the total depth and the total height is greater than zero, the optimal end face clearance, gear height, cavity depth, gear height tolerance zone and cavity depth tolerance zone meet the design requirements.

[0045] In this embodiment, the end face clearance of the gear flowmeter is checked according to the total height and total depth, specifically, whether the difference between the total depth and the total height is greater than zero. If the difference between the total depth and the total height is greater than zero, that is, in the limit case, there is still no gear overheight phenomenon, then the optimal end face clearance, gear height, cavity depth, gear height tolerance zone and cavity depth tolerance zone meet the design requirements.

[0046] like Figure 7 As shown, an embodiment of the second aspect of the present application provides a gear flowmeter end face clearance vertical dimension chain determination system 10, including: an acquisition module 110, used to obtain the gear height and initial end face clearance of the gear flowmeter; a first determination module 120, used to adjust the initial end face clearance, determine the optimal end face clearance, and determine the cavity depth according to the optimal end face clearance and the gear height; a second determination module 130, used to determine the gear height tolerance band and the cavity depth tolerance band according to the optimal end face clearance; a third determination module 140, used to determine the gasket thickness and gasket tolerance according to the optimal end face clearance; a verification module 150, used to determine the internal height according to the gear height, gasket thickness and gasket tolerance, and verify the end face clearance of the gear flowmeter according to the cavity depth and the internal height.

[0047] The gear flowmeter end face clearance vertical dimension chain determination system 10 provided in this embodiment includes an acquisition module 110, a first determination module 120, a second determination module 130, a third determination module 140 and a verification module 150. Among them, the acquisition module 110 is used to obtain the gear height and initial end face clearance of the gear flowmeter. The first determination module 120 is used to adjust the initial end face clearance, determine the optimal end face clearance, and determine the cavity depth according to the optimal end face clearance and the gear height. The second determination module 130 is used to determine the gear height tolerance band and the cavity depth tolerance band according to the optimal end face clearance. The third determination module 140 is used to determine the gasket thickness and gasket tolerance according to the optimal end face clearance. The verification module 150 is used to determine the internal height according to the gear height, gasket thickness and gasket tolerance, and verify the end face clearance of the gear flowmeter according to the cavity depth and the internal height. By determining the core dimension, i.e. the size of the end face clearance, developing the design around the typical value of the end face clearance of the gear flowmeter, determining the acceptable range of the end face clearance, and using the optimal end face clearance to derive the basic dimensions of the structure, and using the structural tolerance to supplement the remaining clearance range, the vertical dimension chain of the end face clearance of the gear flowmeter can be quickly confirmed, reducing the dependence of key parameters on simulation calculations and effectively reducing the design cycle.

[0048] like Figure 8 As shown, an embodiment of the third aspect of the present application provides a gear flowmeter end face clearance vertical dimension chain determination system 20, comprising: a memory 300 and a processor 400, wherein the memory 300 stores a program or instruction that can be run on the processor 400, and when the processor 400 executes the program or instruction, it implements the steps of the gear flowmeter end face clearance vertical dimension chain determination method of any one of the embodiments of the first aspect, and thus has the technical effect of any one of the embodiments of the first aspect mentioned above, which will not be repeated here.

[0049] The embodiment of the fourth aspect of the present application provides a readable storage medium on which a program or instruction is stored. When the program or instruction is executed by the processor, the steps of the method for determining the vertical dimension chain of the end face clearance of the gear flowmeter of any one of the embodiments of the first aspect are implemented, and thus it has the technical effect of any one of the embodiments of the first aspect mentioned above, which will not be repeated here.

[0050] like Figures 9 to 11 As shown, according to a method for determining the vertical dimension chain of the end face clearance of a gear flowmeter according to a specific embodiment provided in the present application, the shaping of related components can be quickly completed in the early stage of structural design without relying on simulation.

[0051] like Fig. 9 and Fig.11As shown, the gear flowmeter is composed of a housing 510, a main cavity, a precision gasket 520, a gear set, a cavity end cover 540, a signal acquisition device, etc. The gear set includes two cylindrical gears 530. The gear set is installed in the cavity to perform rotational motion. In order to make the gear rotate smoothly, a certain gap should be left between the lower end face of the gear and the inner end face of the cavity, and between the upper end face of the gear and the lower surface of the cover plate. Due to the existence of manufacturing errors, if the gap is too small, it is easy to cause rotation jamming. If the gap is too large, it is easy to cause leakage of the transport medium at the end face, reducing the measurement accuracy of the flowmeter. Therefore, the present invention proposes a design method. The method can quickly confirm the vertical dimension chain of the end face gap by reasonably utilizing the dimensional tolerance and the typical value of the end face gap, including: the basic dimensions of the upper and lower end face gaps of the gear, the gear height, and the cavity depth, as well as the dimensional tolerance bands of each component. The method reduces the dependence of key parameters on simulation calculations and effectively reduces the design cycle.

[0052] Determine the core size, that is, the size of the end face gap. This application is designed around the typical value of the flow meter end face gap: ① Determine the acceptable range of the end face gap; ② Use the optimal end face gap to derive the basic size of the structure; ③ Use the structural tolerance to supplement the remaining gap range.

[0053] Simplify first and then improve, use simplified design to verify possible variables, rather than introducing possible variables into the system as design input at the same time: fully simplify the complexity of the assembly model, eliminate the interference of various form and position tolerances on the initial size, and quickly form the original model; gradually add tolerances, and under reasonable technical requirements, ensure that after the introduction of various tolerance variables, the rationality of the end face clearance value can still be met.

[0054] The specific steps are as follows: Simplified fit model: Although designers can radically increase the accuracy level of dimensional tolerances and geometric tolerances, it is impractical to do so considering the manufacturing cost and the process capability of the processing equipment. Without considering the actual accuracy, it is necessary to simplify the complex and idealize the assembly model, that is, to assume that all dimensional tolerances involved in the assembly model are 0. The advantage of this is to reduce the complexity of the model, so that the relative relationship between the end face clearance (Zb, Zt), gear height, and cavity depth is determined: H=W+Zb+Zt, all main line dimensions are confirmed, and tolerances are introduced later to gradually improve the structure. Among them, W is the gear height, H is the cavity depth, Zb is the lower end face clearance, and Zt is the upper end face clearance. The gap between the top of the gear and the inside of the cavity is Xr.

[0055] Determine the end clearance: The single-side end face clearance generally ranges from 10μm to 100μm, and the optimal value is often between 30μm and 40μm. When a small clearance is selected, a more sophisticated equipment process is required, and the matching precision gasket must also control a smaller manufacturing error, otherwise it is easy to cause the end cover to not be completely fastened. Therefore, this choice is not conducive to subsequent assembly and debugging. When a large clearance is selected, although there is a risk of increasing leakage, the clearance is still within a reasonable range, the risk is controllable, and the difficulty of subsequent assembly and debugging is reduced. Therefore, after comprehensive consideration, the initial clearance value is taken as the maximum clearance value of 40μm.

[0056] Determine the basic dimensions: When the gap is symmetrically distributed at both ends, that is, Zb=Zt=0.04mm, there is W+2×0.04=H, that is, H=W+0.08. Considering the actual situation, the basic size is H=W+0.1, that is, the end face gap is adjusted to 0.05mm. It should be noted here that due to the existence of manufacturing errors and the limited specifications of precision gaskets, that is, the difficulty of adjusting the gap is relatively large, the final upper and lower end face gaps are likely to be unequal. Here, Zb and Zt are equal, just to quickly confirm the basic design size, which is the main simplification idea of ​​this strategy.

[0057] Determine the tolerance zone: Generally speaking, a symmetrical tolerance zone can be used. However, in practice, this approach may cause the overall height of the gear and gasket to exceed the depth of the cavity. In order to avoid this possibility and reduce the difficulty of design, a combination strategy of negative tolerance zone for gear height and positive tolerance zone for cavity depth is adopted. Referring to the above end face clearance range, the remaining end face clearance range is reflected in the form of tolerance. Therefore, the tolerance is 0.05, and the structural design dimensions of the relevant components are as follows: Gear height design dimensions: ; Design dimensions of cavity depth: ; So far, the basic dimensional design of gear height, cavity depth and tolerance zone design have been completed.

[0058] Introduce precision gaskets and perform verification considering actual assembly: Common precision gaskets have thicknesses of 0.01mm-0.2mm and other specifications, and their manufacturing tolerances range from 0.002mm-0.006mm.

[0059] exist Fig.10A precision gasket of corresponding size is installed at Zb. At least two layers of precision gaskets are often required here. The bottom layer uses a large gasket to optimize the contact state and make the force more uniform; the upper layer uses a small gasket to reduce the contact area under sliding friction, thereby reducing the sliding friction. The superposition of precision gasket layers means the superposition of dimensional errors here. The size of this place after the precision gasket is installed is still expressed as Zb. The design size of Zb is 0.05mm. Although there are gaskets of the same thickness, the design is based on the principle of at least double-layer configuration, and the configuration strategy of 0.02mm+0.03mm is selected. The corresponding tolerance after the combination is ±0.004mm.

[0060] Finally, check the most likely situation where problems may occur: the internal parts are all taken to the upper deviation limit, the external parts are all taken to the lower deviation limit, and the total height after assembly is: Internal height: (W+0)+(Zb+0.004)=W+0.054; Cavity depth: H+0=H; Then total depth - total height = HW - 0.054 ①; Substituting the basic dimension H=W+0.1 into formula ①, we get: Total depth - total height = 0.046 > 0; That is, under extreme conditions, there will still be no gear overheight phenomenon. The final upper end surface clearance Zt=0.046mm, and the lower end surface clearance Zb=0.054mm, which meet the design requirements.

[0061] In summary, the beneficial effects of the embodiments of the present application are as follows: by reasonably utilizing dimensional tolerances and typical values ​​of end face clearances, the vertical dimension chain of the end face clearances can be quickly confirmed, thereby reducing the dependence of key parameters on simulation calculations and effectively reducing the design cycle.

[0062] In this application, the terms "first", "second", and "third" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance; the term "plurality" refers to two or more, unless otherwise expressly defined. Terms such as "installed", "connected", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0063] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "rear", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or module referred to must have a specific direction, be constructed and operated in a specific direction, and therefore, should not be understood as a limitation on the present application.

[0064] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0065] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining the vertical dimension chain of the end face clearance of a gear flowmeter, characterized in that: include: Obtain the gear height and initial end face clearance of the gear flowmeter; The initial end face clearance is adjusted to determine an optimal end face clearance, and the cavity depth is determined according to the optimal end face clearance and the gear height; Determine the gear height tolerance zone and the cavity depth tolerance zone according to the optimal end face clearance; Determine the gasket thickness and gasket tolerance according to the optimal end face gap; The internal height is determined according to the gear height, the gasket thickness and the gasket tolerance, and the end face clearance of the gear flowmeter is checked according to the cavity depth and the internal height.

2. The method for determining the vertical dimension chain of the end face clearance of a gear flowmeter according to claim 1, characterized in that: The step of obtaining the gear height and initial end face clearance of the gear flowmeter comprises: Obtain the gear height and optimal single-side end face clearance range of the gear flowmeter; The initial upper end surface gap and the initial lower end surface gap are determined according to the optimal single-side end surface gap range, and the optimal single-side end surface gap range is 30 μm-40 μm.

3. The method for determining the vertical dimension chain of the end face clearance of a gear flowmeter according to claim 2, characterized in that: The adjusting the initial end face clearance to determine the optimal end face clearance, and determining the cavity depth according to the optimal end face clearance and the gear height, comprises: Adjusting the initial upper end surface clearance to determine an optimal upper end surface clearance; Adjusting the initial lower end surface clearance to determine an optimal lower end surface clearance; The depth of the cavity is determined according to the optimal upper end surface clearance, the optimal lower end surface clearance and the gear height.

4. The method for determining the vertical dimension chain of the end face clearance of a gear flowmeter according to any one of claims 1 to 3, characterized in that: The gear height tolerance zone is a negative tolerance zone, and the cavity depth tolerance zone is a positive tolerance zone.

5. The method for determining the vertical dimension chain of the end face clearance of a gear flowmeter according to claim 3, characterized in that: Determining the gasket thickness and gasket tolerance according to the optimal end face gap includes: Determine the first gasket thickness and the second gasket thickness according to the optimal upper end surface gap; A shim tolerance is determined based on the first shim thickness and the second shim thickness.

6. The method for determining the vertical dimension chain of the end face clearance of a gear flowmeter according to claim 5, characterized in that: The method of determining the internal height according to the gear height, the gasket thickness and the gasket tolerance, and checking the end face clearance of the gear flowmeter according to the cavity depth and the internal height, comprises: Determine the total height after combination according to the gear height, the optimal upper end surface clearance, and the gasket tolerance, and determine the total depth after combination according to the cavity depth; The end face clearance of the gear flowmeter is calibrated according to the total height and the total depth.

7. The method for determining the vertical dimension chain of the end face clearance of a gear flowmeter according to claim 6, characterized in that: The checking of the end face clearance of the gear flowmeter according to the total height and the total depth comprises: Determining whether the difference between the total depth and the total height is greater than zero; If the difference between the total depth and the total height is greater than zero, the optimal end face clearance, the gear height, the cavity depth, the gear height tolerance zone, and the cavity depth tolerance zone meet the design requirements.

8. A gear flowmeter end face clearance vertical dimension chain determination system, characterized in that: include: An acquisition module (110) is used to acquire the gear height and initial end face clearance of the gear flowmeter; A first determination module (120) is used to adjust the initial end face clearance to determine an optimal end face clearance, and determine the cavity depth according to the optimal end face clearance and the gear height; A second determination module (130), configured to determine a gear height tolerance zone and a cavity depth tolerance zone according to the optimal end face clearance; A third determination module (140), configured to determine a gasket thickness and a gasket tolerance according to the optimal end surface gap; A calibration module (150) is used to determine the internal height according to the gear height, the gasket thickness and the gasket tolerance, and to calibrate the end face clearance of the gear flowmeter according to the cavity depth and the internal height.

9. A gear flowmeter end face clearance vertical dimension chain determination system, characterized in that: include: A memory (300) and a processor (400), wherein the memory (300) stores a program or instruction that can be run on the processor (400), and when the processor (400) executes the program or the instruction, the steps of the method for determining the vertical dimension chain of the end face clearance of a gear flowmeter as described in any one of claims 1 to 7 are implemented.

10. A readable storage medium having a program or instruction stored thereon, characterized in that: When the program or the instructions are executed by the processor, the steps of the method for determining the vertical dimension chain of the end face clearance of the gear flowmeter as described in any one of claims 1 to 7 are implemented.

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