Wide-temperature high-precision flow measurement converter

Abstract

The utility model relates to the technical field of oiling machine metering, and provides a wide-temperature high-precision flow measuring converter which comprises a shell, one side of the shell is fixedly connected with a flow adjusting end cover, the periphery of the shell is fixedly connected with a side end cover, the interior of the shell is rotationally connected with a crankshaft, and the crankshaft is fixedly connected with the side end cover. The top end of the crankshaft is fixedly connected with a distribution valve extending to the interior of the upper cover, the surface of the crankshaft is fixedly connected with a rotating rod, one side of the rotating rod is fixedly connected with pistons, and the movement stroke of the four pistons is limited through a side end cover and a quantity adjusting end cover by means of middle protruding parts of the side end cover and the quantity adjusting end cover; when the piston reaches the designed stroke, the oil inlet and the oil outlet of the corresponding distribution valve have certain opening degree, so that the length of the distribution valve cylinder sleeve and the length of the piston connecting rod of the flowmeter are strictly controlled in the production link, the piston stroke and the piston metering volume can be ensured to be consistent, and the flow metering precision can be further ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel dispenser metering, and in particular to a wide-temperature high-precision flow measurement converter. Background Art

[0002] With the increasing popularity of automobiles, there are more and more gas stations. In the metering system of gas stations, the flow measurement transducer of the gas station is one of the key components for oil metering. It can monitor and record the flow, temperature, density and other parameters of the oil, and output the monitoring results to the computer system for processing and management, which is convenient for managers to conduct sales analysis and report generation.

[0003] After searching, the existing patent (publication number: CN115218979A) discloses a flow measurement transducer, which aims to solve the problems of low metering accuracy, short service life and difficulty in maintenance of the existing flow measurement transducer. The transducer mainly includes a body, a bottom cover, a top cover, a side cover and a volume adjustment end cover assembly are arranged on the body, a crank assembly is arranged between the bottom cover and the top cover, the crank assembly includes a crankshaft and a bearing mounted on the crankshaft, one end of the crankshaft is connected to a distribution valve, and the other end is connected to the bottom cover, and the distribution valve is arranged on a valve seat; a piston connecting rod assembly and a piston bushing are arranged between the side cover and the volume adjustment end cover assembly, and the crankshaft passes through the piston connecting rod assembly through a bearing. The cavity of the piston connecting rod assembly of the present application adopts a straight line-arc design, and the two roller bearings mounted on the crankshaft are the same size, so that the volume adjustment end cover assembly can be exchanged at any end face, thereby facilitating later replacement and maintenance, and greatly improving the reliability, stability, metering accuracy and service life of the flow measurement transducer.

[0004] However, in the above scheme, when the piston flowmeter is working, the distribution valve switch inlet and outlet oil ports need to coordinate the piston to operate in sequence. The liquid pressure on the piston is the same as the change in the distribution valve opening. The liquid pressure minus the friction between the piston and the cylinder body, minus the reaction force of the crankshaft rotation, is the piston travel force. However, when refueling at a small flow rate, the resultant force is not enough to push the piston to the limit position. At this time, the oil inlet opening formed by the distribution valve and the distribution valve seat reaches the limit, and the piston stroke cannot be guaranteed. In particular, when the pressure of the fuel dispenser hydraulic system changes and the reciprocating motion generates a huge inertial force, the piston stroke limit position is unstable and the consistency is poor, which directly affects the flow metering accuracy and the service life.

[0005] In view of this, the utility model proposes a wide temperature range and high precision flow measurement converter. Utility Model Content

[0006] The utility model provides a wide-temperature high-precision flow measurement converter, which solves the problem of inaccurate flow measurement accuracy in related technologies.

[0007] The technical solution of the utility model is as follows: A wide temperature and high-precision flow measurement converter, including a shell, one side of the shell is fixedly connected to an adjustable end cover, one side of the adjustable end cover is provided with an adjustable component, the shell is fixedly connected with side end covers around, the top of the shell is fixedly connected with an upper cover, one side of the upper cover is provided with an oil inlet, and the lower end of the other side of the shell is provided with an oil outlet, the inside of the shell is rotatably connected to a crankshaft, the top of the crankshaft is fixedly connected to a distribution valve extending to the inside of the upper cover, the surface of the crankshaft is fixedly connected to a rotating rod, one side of the rotating rod is fixedly connected to a piston, and the side end cover and the middle raised portion of the adjustable end cover are used to limit the movement stroke of the four pistons, thereby ensuring that when the piston reaches the designed stroke, the corresponding distribution valve inlet and outlet oil ports still have a certain opening.

[0008] Preferably, the distribution valve is made of high-performance die-cast aluminum alloy material with a surface hard oxidation treatment to improve strength and flatness and reduce the friction coefficient.

[0009] Preferably, the side end cover and the adjusting end cover are mountain-shaped in top view, and the middle protrusions of the side end cover and the adjusting end cover are respectively on the same axis as the middle protrusion of the piston, and the middle protrusions of the two are used to limit the movement stroke of the four pistons.

[0010] Preferably, a sealing ring is fixedly connected to the inner wall of the side end cover and the regulating end cover, and the cross-section of the sealing ring is O-shaped, thereby improving the sealing performance between the side end cover and the regulating end cover and the housing.

[0011] Preferably, a sliding structure is formed between the piston and the surrounding of the inside of the housing, and there are four pistons distributed at equal angles, which facilitates the smoothness of oil delivery control.

[0012] Preferably, a sealing lip is annularly fixedly connected to one side of the piston surface, and the sealing lip is trumpet-shaped. The trumpet-shaped sealing lip is used to improve the sealing performance of the sliding between the piston and the inner wall of the housing, thereby ensuring that the piston and the cylinder liner can still be sealed in a low temperature environment and after long-term use. It can also effectively remove fine impurities in the oil, reduce the wear of the piston and the cylinder liner, extend the service life, avoid leakage, and improve the stability and measurement accuracy of the flowmeter.

[0013] Preferably, the crankshaft is made of a new alloy material, and the cross-section of the crankshaft is Z-shaped, which ensures that the linear expansion coefficients of the crankshaft and the piston cylinder are the same, eliminates the system error caused by ambient temperature factors, and makes the flow meter more adaptable to ambient temperature.

[0014] The working principle and beneficial effects of the utility model are:

[0015] 1. In the utility model, the side end cover and the regulating end cover are provided, and the middle convex part of the side end cover and the regulating end cover is used to limit the movement stroke of the four pistons, so as to ensure that when the piston reaches the design stroke, the corresponding distribution valve oil inlet and outlet ports still have a certain opening. In this way, the piston stroke can be guaranteed by strictly controlling the length of the flow meter distribution valve cylinder sleeve and the length of the piston connecting rod in the production link, so as to ensure that the piston metering volume is consistent, thereby ensuring the accuracy of flow metering, extending its service life, and improving its practicality;

[0016] 2. The utility model provides a trumpet-shaped sealing lip, which is used according to the piston, crankshaft and sealing lip to improve the sealing performance of the piston and the inner wall of the housing, thereby ensuring that the piston and the cylinder liner can still be sealed and fitted in a low temperature environment and after long-term use, and can effectively remove fine impurities in the oil, reduce the wear of the piston and the cylinder liner, extend the service life, avoid leakage, and improve the stability and measurement accuracy of the flow meter. In addition, the crankshaft made of alloy material is used to ensure that the linear expansion coefficients of the crankshaft and the piston cylinder body are the same, eliminating the system error caused by the ambient temperature factor, making the ambient temperature adaptability of the flow meter stronger, and further improving the measurement accuracy of the flow meter. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] Figure 1 It is a schematic diagram of the overall cross-sectional structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the overall structure of the utility model;

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model in a top view;

[0021] Figure 4 This is a schematic diagram of the overall structure of the piston of the utility model;

[0022] Figure 5 It is a partial enlarged top view of the structure of the shell of the utility model.

[0023] In the figure: 1. Upper cover; 2. Distribution valve; 3. Housing; 4. Side end cover; 5. Piston; 6. Crankshaft; 7. Rotating rod; 8. Oil inlet; 9. Oil outlet; 10. Adjustment component; 11. Adjustment end cover; 12. Sealing lip; 13. Sealing ring. DETAILED DESCRIPTION

[0024] The following will be combined with the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] The preferred embodiment of the wide temperature and high precision flow measurement converter provided by the utility model is as follows Figures 1 to 5 As shown: a wide temperature and high-precision flow measurement converter, including a shell 3, a regulating end cover 11 is fixedly connected to one side of the shell 3, a regulating component 10 is arranged on one side of the regulating end cover 11, side end covers 4 are fixedly connected to the four sides of the shell 3, an upper cover 1 is fixedly connected to the top of the shell 3, an oil inlet 8 is provided on one side of the upper cover 1, and an oil discharge port 9 is provided at the lower end of the other side of the shell 3, a crankshaft 6 is rotatably connected to the inside of the shell 3, a distribution valve 2 extending to the inside of the upper cover 1 is fixedly connected to the top of the crankshaft 6, a rotating rod 7 is fixedly connected to the surface of the crankshaft 6, and a piston 5 is fixedly connected to one side of the rotating rod 7, and the middle protrusions of the side end cover 4 and the regulating end cover 11 are used to limit the movement stroke of the four pistons 5, thereby ensuring that when the piston 5 reaches the designed stroke, the corresponding oil inlet and outlet ports of the distribution valve 2 still have a certain opening.

[0026] In this embodiment, the distribution valve 2 is made of high-performance die-cast aluminum alloy material with a hard oxidation treatment on the surface to improve the strength and flatness and reduce the friction coefficient.

[0027] In this embodiment, the shape of the side end cover 4 and the adjusting end cover 11 in the top view is a mountain shape, and the middle protrusions of the side end cover 4 and the adjusting end cover 11 are respectively on the same axis as the middle protrusions of the piston 5, and the middle protrusions of the side end cover 4 and the adjusting end cover 11 are used to limit the movement stroke of the four pistons 5.

[0028] In this embodiment, a sealing ring 13 is fixedly connected to the inner wall of the side end cover 4 and the regulating end cover 11. The cross-section of the sealing ring 13 is O-shaped. The O-shaped sealing ring 13 is used to improve the sealing performance between the side end cover 4 and the regulating end cover 11 and the shell 3.

[0029] In this embodiment, a sliding structure is formed between the piston 5 and the surrounding of the inside of the housing 3. There are four pistons 5 distributed at equal angles. The sliding of the four pistons 5 and the inside of the housing 3 facilitates the smoothness of the oil delivery control.

[0030] In this embodiment, a sealing lip 12 is fixedly connected in an annular manner to one side of the surface of the piston 5. The sealing lip 12 is in a trumpet shape. The trumpet-shaped sealing lip 12 is used to improve the sealing performance of the piston 5 and the inner wall of the housing 3 during sliding, thereby ensuring that the piston 5 and the cylinder liner can still be sealed in a low temperature environment and after long-term use. It can also effectively remove fine impurities in the oil, reduce the wear of the piston 5 and the cylinder liner, extend the service life, avoid leakage, and improve the stability and measurement accuracy of the flow meter.

[0031] In this embodiment, the crankshaft 6 is made of a new alloy material, and the cross-section of the crankshaft 6 is Z-shaped. The use of the alloy crankshaft 6 ensures that the linear expansion coefficients of the crankshaft 6 and the cylinder of the piston 5 are the same, eliminating the system error caused by the ambient temperature factor, and making the flow meter more adaptable to the ambient temperature.

[0032] The working principle and use process of the utility model are as follows: first, the high-pressure oil from the combined pump enters the central distribution port of the piston 5 through the oil inlet 8, enters the channel on the oil cylinder through the valve seat hole, and enters the interior of a cylinder sleeve inside the housing 3, thereby pushing the piston 5 in the oil cylinder to move, and pushing the opposite piston 5 to move through the rotating rod 7, so as to discharge the oil in the opposite oil cylinder, and while the piston 5 is moving, the piston 5 is driven to rotate through the cooperation of the crankshaft 6. When the piston 5 rotates a certain angle, the other pair of opposite oil cylinders enters and discharges oil, and then the four pistons 5 complete a working cycle under the push of the oil;

[0033] And in its working process, the middle convex part of the side end cover 4 and the regulating end cover 11 can be used to limit the movement stroke of the four pistons 5, so as to ensure that when the piston 5 reaches the designed stroke, the corresponding oil inlet and outlet ports of the distribution valve 2 still have a certain opening. In this way, by strictly controlling the cylinder sleeve length of the flow meter distribution valve 2 and the connecting rod length of the piston 5 in the production link, the piston 5 stroke can be guaranteed, and the metering volume of the piston 5 can be guaranteed to be consistent, so as to ensure the accuracy of flow metering and extend its service life. At the same time, the trumpet-shaped sealing lip 12 is used to improve the sealing performance of the sliding between the piston 5 and the inner wall of the housing 3, so as to ensure that the piston 5 and the cylinder sleeve can still be sealed and fitted under low temperature environment and after long-term use, and can effectively remove fine impurities in the oil, reduce the wear of the piston 5 and the cylinder sleeve, extend the service life, avoid leakage, improve the stability and metering accuracy of the flow meter, and use the crankshaft 6 made of alloy material to ensure that the linear expansion coefficient of the cylinder body of the crankshaft 6 and the piston 5 is the same, eliminate the system error caused by the ambient temperature factor, make the ambient temperature adaptability of the flow meter stronger, and further improve the metering accuracy of the flow meter.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-precision flow measurement transducer with a wide temperature range, comprising a housing (3), characterized in that: A volume regulating end cover (11) is fixedly connected to one side of the housing (3), and a volume regulating component (10) is provided on one side of the volume regulating end cover (11). Side end covers (4) are fixedly connected to the four sides of the housing (3). An upper cover (1) is fixedly connected to the top of the housing (3). An oil inlet (8) is provided on one side of the upper cover (1), and an oil outlet (9) is provided at the lower end of the other side of the housing (3). A crankshaft (6) is rotatably connected to the interior of the housing (3), and a distribution valve (2) extending to the interior of the upper cover (1) is fixedly connected to the top of the crankshaft (6). A rotating rod (7) is fixedly connected to the surface of the crankshaft (6), and a piston (5) is fixedly connected to one side of the rotating rod (7).

2. A wide temperature and high precision flow measurement transducer according to claim 1, characterized in that: The distribution valve (2) is made of high-performance die-cast aluminum alloy material with a surface hard-oxidized treatment.

3. The wide temperature and high precision flow measurement transducer according to claim 1, characterized in that: The side end cover (4) and the metering end cover (11) are shaped like mountains when viewed from above, and the middle convex parts of the side end cover (4) and the metering end cover (11) are respectively located on the same axis as the middle convex part of the piston (5).

4. The wide temperature and high precision flow measurement transducer according to claim 1, characterized in that: The inner walls of the side end cover (4) and the regulating end cover (11) are fixedly connected with a sealing ring (13), and the cross-section of the sealing ring (13) is in an O-shape.

5. The wide temperature and high precision flow measurement transducer according to claim 1, characterized in that: A sliding structure is formed between the piston (5) and the periphery of the interior of the distribution valve (2), and there are four pistons (5) distributed at equal angles.

6. A wide temperature and high precision flow measurement transducer according to claim 1, characterized in that: A sealing lip (12) is annularly fixedly connected to one side of the surface of the piston (5), and the sealing lip (12) is in the shape of a trumpet.

7. The wide temperature and high precision flow measurement transducer according to claim 1, characterized in that: The crankshaft (6) is made of a new alloy material, and the cross-section of the crankshaft (6) is in a Z shape.

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