Flow measurement converter

Abstract

This invention discloses a flow measurement transducer, aiming to solve the problems of low metering accuracy, short service life, and difficulty in maintenance of existing flow measurement transducers. It mainly includes a body, on which are mounted a bottom cover, a top cover, a side cover, and an adjustable end cover assembly. A crank assembly is disposed between the bottom cover and the top cover. The crank assembly includes a crankshaft and bearings 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. The distribution valve is mounted on a valve seat. A piston connecting rod assembly and a piston bushing are disposed between the side cover and the adjustable end cover assembly. The crankshaft passes through the piston connecting rod assembly via bearings. The piston connecting rod assembly of this application adopts a straight-line-circular arc design, and the two roller bearings mounting the crankshaft are of the same size. This allows the adjustable end cover assembly to be repositioned at any end face, facilitating future replacement and maintenance, and significantly improving the reliability, stability, metering accuracy, and service life of the flow measurement transducer.

Description

Technical Field

[0001] This invention relates to the field of fuel dispenser metering equipment technology, specifically to a flow measurement converter. Background Technology

[0002] A fuel dispenser is a liquid volume measurement system used to refuel vehicles. The flow rate transducer is a crucial component of the dispenser's metering process and a key focus of its calibration; its accuracy directly impacts the interests of both businesses and consumers. The "heart" of a fuel dispenser, commonly referred to as its mechanism, consists of a fuel pump and a flow rate transducer. The basic function of a fuel dispenser is to measure fuel volume. The pump draws fuel from the tank, which is then measured by the flow rate transducer. An encoder converts this mechanical signal into an electronic signal, which is processed by a computer, and finally, the volume of fuel is displayed on a screen. Because fuel dispensers are subject to mandatory national calibration, the flow rate transducer plays a vital role, and its quality directly determines the overall performance of the dispenser.

[0003] The piston assembly of the existing fuel dispenser flow measurement converter is a relatively complex assembled piston assembly, which increases the assembly difficulty of the flow measurement converter and greatly reduces the assembly efficiency. In addition, the high friction coefficient between the distribution valve and the valve seat of the existing flow measurement converter results in low metering accuracy and easy damage. More importantly, the adjustment end cap assembly of the existing flow measurement converter can only be reversed, which is not convenient for later replacement and maintenance.

[0004] The information disclosed in this background section is intended only to enhance the understanding of the background technology of this disclosure and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0005] The inventors discovered through research that the metering accuracy and service life of the flow measurement converter are reduced due to the influence of the distribution valve, piston assembly, and flow adjustment end cap assembly, and the working efficiency is slow, making it impossible to repair and replace the flow adjustment end cap assembly in the later stage.

[0006] In view of at least one of the above technical problems, this disclosure provides a flow measurement converter that improves the metering accuracy and service life of the flow measurement converter by changing the friction pair between the distribution valve and the valve seat, simplifies the assembly process and improves the assembly efficiency by changing the assembly method of the piston assembly, and allows the position of the adjustable end cover assembly to be changed by changing the shape of the piston connecting rod assembly cavity, thereby facilitating subsequent replacement and maintenance.

[0007] According to one aspect of this disclosure, a flow measurement converter is provided, including a body, on which a bottom cover, a top cover, a side cover, and an adjustable end cover assembly are disposed. A crank assembly is disposed 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. The distribution valve is disposed on a valve seat.

[0008] A piston connecting rod assembly and a piston bushing are provided between the side cover and the adjustable end cover assembly, and the crankshaft passes through the piston connecting rod assembly via a bearing.

[0009] In some embodiments of this disclosure, the piston-connecting rod assembly includes a connecting rod and piston assemblies disposed at both ends of the connecting rod;

[0010] The connecting rod includes a cavity disposed in its middle for passing through the crankshaft, a fixing part disposed at both ends for mounting the piston assembly, and a supporting part for supporting the piston assembly.

[0011] The piston assembly includes a front disc, a cup, and a rear disc that are fixedly connected or integrally formed in sequence.

[0012] In some embodiments of this disclosure, the cavity is a cavity similar to a straight groove, and its outer contour includes two semi-circular arcs that are symmetrical and equal in size and a connecting segment connecting the two semi-circular arcs.

[0013] The connecting section includes a straight section and an arc section corresponding to the outer periphery of the bearing, so as to facilitate the movement of the crankshaft within the cavity.

[0014] In some embodiments of this disclosure, the bearings are roller bearings, and there are two of them of the same size, so as to facilitate the movement of the crankshaft in the cavity through the roller bearings, and to facilitate the adjustment of the position of any end face of the adjustable end cover assembly as needed.

[0015] In some embodiments of this disclosure, the fixing part is provided with external threads so that after the piston assembly is fitted onto the fixing part in the direction from the front plate to the rear plate, it is fixed with a nut and the rear plate is kept in close contact with the support part.

[0016] In some embodiments of this disclosure, an elastic washer is provided between the nut and the front disc; a sealing gasket is provided between the support portion and the rear disc to ensure that the piston assembly is tightly installed on the connecting rod.

[0017] In some embodiments of this disclosure, the sealing gasket is made of polytetrafluoroethylene and the elastic washer is made of 65Mn spring steel.

[0018] In some embodiments of this disclosure, the distribution valve is made of polytetrafluoroethylene and the valve seat is made of stainless steel.

[0019] In some embodiments of this disclosure, the piston bushing is a deep-drawn piston bushing made from a single sheet, and its surface hardness is HRC41 or higher.

[0020] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0021] 1. The piston connecting rod assembly of this application adopts a straight-arc design for its cavity, and the two roller bearings for mounting the crankshaft are the same size. This allows the adjustable end cap assembly to be repositioned at any end face, thus facilitating later replacement and maintenance.

[0022] 2. This application sets the mating friction pair between the distribution valve and the valve seat to a friction pair composed of polytetrafluoroethylene and stainless steel, which reduces the friction coefficient and the resistance torque of the flow measurement converter, thereby significantly improving the reliability, stability, metering accuracy and service life of the flow measurement converter.

[0023] 3. The piston assembly is a one-piece machined piston assembly, replacing the original three-piece separately assembled piston assembly, which simplifies the assembly process, improves assembly efficiency, and thus improves production efficiency. Attached Figure Description

[0024] Figure 1 This is one of the structural schematic diagrams of an embodiment of this application.

[0025] Figure 2 This is a second structural schematic diagram of an embodiment of this application.

[0026] Figure 3 This is one of the structural schematic diagrams of a piston connecting rod assembly in one embodiment of this application.

[0027] Figure 4 This is a second schematic diagram of the piston connecting rod assembly in one embodiment of this application.

[0028] Figure 5 This is a schematic diagram of the connecting rod in one embodiment of this application.

[0029] Figure 6 for Figure 5 Enlarged view of part A in the middle.

[0030] Figure 7 This is one of the working principle diagrams of an embodiment of this application.

[0031] Figure 8 This is a second schematic diagram illustrating the working principle of an embodiment of this application.

[0032] Figure 9This is the third working principle diagram of an embodiment of this application.

[0033] In the above figures, 1 is the top cover, 2 is the bottom cover, 3 is the adjustable end cover assembly, 4 is the quantitative end cover assembly, 5 is the crankshaft, 6 is the piston connecting rod assembly, 61 is the connecting rod, 611 is the connecting rod body, 612 is the mounting part, 613 is the stepped part, 62 is the piston assembly, 621 is the rear plate, 622 is the piston cup, 63 is the cavity, 631 is the straight section, 632 is the arc section, 64 is the nut, 7 is the piston bushing, 8 is the distribution valve, and 9 is the chassis. Detailed Implementation

[0034] In the description of this application, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "vertical," "horizontal," "clockwise," and "counterclockwise," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The terms "first," "second," etc., used in this application are used to distinguish the described objects and do not have any sequential or technical meaning. And the terms "connection" and "linkage," unless otherwise specified, include both direct and indirect connections (linkages).

[0035] Unless otherwise specified, the unit modules (components, structures, mechanisms) or sensors involved in the following embodiments are all conventional commercially available products.

[0036] This application provides a flow measurement converter that solves the technical problems of low metering accuracy, short service life, and difficulty in maintenance of existing flow measurement converters.

[0037] The technical solution in this application aims to address the aforementioned problems of low measurement accuracy, short service life, and difficulty in maintenance. The overall approach is as follows:

[0038] By changing the friction pair between the distribution valve and the valve seat, the material of the distribution valve is set to polytetrafluoroethylene (PTFE), and the material of the valve seat is set to stainless steel. The friction pair between them is a combination of PTFE and stainless steel, which has a low coefficient of friction. This reduces the resistance torque of the flow measurement converter and significantly improves the metering accuracy of the flow measurement converter.

[0039] The assembly process is simplified by using an integrated piston assembly. The front disc, cup, and rear disc that make up the piston assembly are set as a single molded or fixed connection type to replace the original disassembled parts assembly, thereby improving assembly efficiency and production efficiency.

[0040] Through the cooperation between the connecting rod cavity and the crank assembly, the outer periphery of the cavity is provided with an arc segment corresponding to the outer contour of the two roller bearings of the crank assembly, so as to allow the roller bearings to rotate, thereby allowing the adjustable end cap assembly to be repositioned on any end face, which is convenient for later replacement and maintenance.

[0041] To better understand the technical solution of this application, the above technical solution will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] Example 1

[0043] This example discloses a flow measurement converter; see [link to relevant documentation]. Figure 1 and Figure 2 The main components include a body, on which a bottom cover 2, a top cover 1, a side cover, and an adjustable end cover assembly 3 are provided. A crank assembly is provided between the bottom cover 2 and the top cover 1. The crank assembly includes a crankshaft 5 and a bearing mounted on the crankshaft 5. One end of the crankshaft 5 is connected to a distribution valve 8, and the other end is connected to the bottom cover 2. The distribution valve 8 is located on a valve seat. A piston connecting rod assembly 6 and a piston bushing 7 are provided between the side cover and the adjustable end cover assembly 3. The crankshaft 5 passes through the piston connecting rod assembly 6 through the bearing.

[0044] like Figure 3 and 4 As shown, the piston-connecting rod assembly 6 includes a connecting rod 61 and piston assemblies 62 disposed at both ends of the connecting rod 61; as Figure 5 and 6 As shown, the connecting rod 61 includes a cavity disposed in its middle for passing through the crankshaft 5, a fixing part disposed at both ends for mounting the piston assembly 62, and a supporting part for supporting the piston assembly 62; the piston assembly 62 includes a front disc, a cup 622 and a rear disc 621 that are fixedly connected or integrally formed in sequence. The integral forming or fixed connection of the piston assembly 62 simplifies the assembly process of the piston connecting rod assembly 6, thereby improving assembly efficiency.

[0045] The cavity is a cavity similar to a straight groove, and its outer contour includes two semi-circular arcs that are symmetrical and equal in size, as well as a connecting segment connecting the two semi-circular arcs. The connecting segment includes a straight segment 631 and an arc segment 632 corresponding to the outer circumference of the bearing, so as to facilitate the movement of the crankshaft 5 in the cavity and allow the bearing to rotate in the cavity corresponding to the arc segment 632. The bearing is a roller bearing, and there are two of them with the same size, so as to facilitate the movement of the crankshaft 5 in the cavity through the roller bearing, and to facilitate the adjustment of the position of any end face of the adjustable end cap assembly 3 as needed, thereby facilitating later replacement and maintenance.

[0046] Furthermore, an elastic washer is provided between the nut 64 and the front disc; a sealing gasket is provided between the support portion and the rear disc 621 to ensure that the piston assembly 62 is tightly installed on the connecting rod 61, further improving the working efficiency of the piston assembly 62; wherein, the sealing gasket is made of polytetrafluoroethylene, and the elastic washer is made of 65Mn spring steel. The distribution valve 8 is made of polytetrafluoroethylene, and the valve seat is made of stainless steel, which reduces the coefficient of friction between the distribution valve 8 and the valve seat, and reduces the resistance torque of the flow measurement converter, thereby significantly improving its metering accuracy and service life. The piston bushing 7 is a single-plate deep-drawn piston bushing 7 with a surface hardness of HRC41 or higher to ensure its wear resistance and improve its service life.

[0047] The working principle of the above-mentioned flow measurement converter is as follows:

[0048] like Figure 7 As shown in Figures 8 and 9, where A, B, C, and D are the piston chambers of the transverse and vertical piston-connecting rod assemblies, respectively, and the arrows indicate the fuel flow direction. Pressurized oil from the oil pump passes through the top cover and is distributed via the distribution valve 8. It then enters chambers A and B through oil passages. Chambers A and B are connected to the inlet of the flow measurement converter via oil passages and the distribution valve 8. Under the action of the pressurized oil, piston-connecting rod assembly AC moves from end A to end C, and piston-connecting rod assembly BD moves from end B to end D. Simultaneously, as... Figure 7 As shown, the two piston connecting rod assemblies together drive the crankshaft to rotate clockwise, and the distribution valve 8 also rotates clockwise.

[0049] When the flow measurement converter operates as follows Figure 8 At the indicated position, distributor valve 8 completely closes the inlet and outlet oil passages of the AC piston-connecting rod assembly, placing the AC piston-connecting rod assembly at its dead center. At this time, the BD piston-connecting rod assembly continues to move from end B to end D, driving the crank assembly to continue rotating.

[0050] Driven by the BD piston-connecting rod assembly, the distribution valve 8 reopens the inlet and outlet oil passages of the piston-connecting rod assembly AC, but the inlet and outlet oil passages are swapped, thus causing the piston-connecting rod assembly AC to pass the dead center position, as shown below. Figure 9 As shown, its direction of motion changes from end C to end A, that is, the AC piston assembly connecting rod has achieved a reversal.

[0051] Although some preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of the invention.

[0052] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this application and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A flow measurement converter, comprising a body, wherein the body is provided with a bottom cover, a top cover, a side cover, and an adjustable end cover assembly, characterized in that, A crank assembly is provided 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. The distribution valve is located on a valve seat. A piston connecting rod assembly and a piston bushing are provided between the side cover and the adjusting end cover assembly. The crankshaft passes through the piston connecting rod assembly through the bearing. The piston connecting rod assembly includes a connecting rod and piston assemblies disposed at both ends of the connecting rod; the connecting rod includes a cavity disposed in its middle for passing through the crankshaft, a fixing part disposed at both ends for mounting the piston assembly, and a supporting part for supporting the piston assembly; the piston assembly includes a front disc, a cup, and a rear disc that are fixedly connected or integrally formed in sequence. The cavity is a cavity similar to a straight groove, and its outer contour includes two semi-circular arcs that are symmetrical and equal in size and a connecting segment connecting the two semi-circular arcs; the connecting segment includes a straight segment and an arc segment corresponding to the outer circumference of the bearing, so as to facilitate the movement of the crankshaft in the cavity; The bearings are roller bearings, and there are two of them, which are the same size, so as to facilitate the movement of the crankshaft in the cavity through the roller bearings, and to facilitate the adjustment of the position of any end face of the adjustable end cover assembly as needed.

2. The flow measurement converter according to claim 1, characterized in that, The fixing part is provided with external threads so that after the piston assembly is fitted onto the fixing part in the direction from the front plate to the rear plate, it is fixed with a nut and the rear plate is kept in close contact with the support part.

3. The flow measurement converter according to claim 2, characterized in that, An elastic washer is provided between the nut and the front plate; a sealing gasket is provided between the support and the rear plate to ensure that the piston assembly is tightly installed on the connecting rod.

4. The flow measurement converter according to claim 3, characterized in that, The sealing gasket is made of polytetrafluoroethylene, and the elastic washer is made of 65Mn spring steel.

5. The flow measurement converter according to claim 1, characterized in that, The distribution valve is made of polytetrafluoroethylene, and the valve seat is made of stainless steel.

6. The flow measurement converter according to claim 1, characterized in that, The piston bushing is a deep-drawn piston bushing made from a single sheet, and its surface hardness is HRC41 or higher.

Images