Piston flowmeter suitable for fuel dispenser

Abstract

The invention discloses a piston flow meter suitable for a fuel oiling machine, and belongs to the technical field of measuring instruments, the piston flow meter comprises a main body, a bottom cover is fixedly installed at the bottom of the main body through cooperation of a bolt and a nut, and the bottom cover is used for sealing the bottom of the main body. Bubbles in fuel oil can be broken through vibration when the elastic piece vibrates, the bubbles in the fuel oil can be eliminated through the bubble removing assembly when the oiling machine adds the fuel oil to a vehicle, and after the bubbles in the fuel oil are eliminated, the flow calculated by the piston flow meter is the same as the flow actually added by the vehicle. After fuel oil enters the overflow tank, the first impeller rotates to discharge the fuel oil into the extrusion cavity through the backflow tank, so that the fuel oil can conveniently flow back into the extrusion cavity after bubbles in the fuel oil are eliminated, and the suction force of the second impeller can discharge gas in the overflow pipe out of the exhaust port through the exhaust pipe; and the separated gas can be conveniently and quickly discharged.

Description

Technical Field

[0001] The invention relates to the technical field of measuring instruments, in particular to a piston flow meter suitable for a fuel dispenser. Background Art

[0002] Measurement is the eye of industrial production. Flow measurement is one of the components of measurement science and technology, and it is closely related to the national economy, national defense construction, and scientific research. Flowmeters indicate the measured flow rate and (or) the total amount of fluid in a selected time interval. Piston flowmeters measure the flow of fuel by mechanical means of piston movement.

[0003] At present, the piston flowmeter suitable for fuel dispensers on the market will be installed on the fuel dispenser when in use. When the fuel dispenser adds fuel to the vehicle, the fuel will pass through the piston flowmeter to refuel the vehicle, and the fuel can enter the inside of the extrusion chamber through the liquid inlet. When the fuel enters the extrusion chamber, it will generate upward pressure to push the piston. When the piston is pushed, it can slide upward inside the extrusion chamber. When the piston slides upward, it can squeeze the return spring and drive the push rod to contact the flowmeter. When the push rod contacts the flowmeter, the flow of fuel will be measured, and the fuel can be discharged through the drain port. The discharge of fuel will add fuel to the vehicle, but the fuel will flow inside the fuel dispenser pipeline before entering the piston flowmeter. During the flow of fuel, external air will also enter the fuel. When air enters the fuel, a large number of bubbles will be generated. The increase of bubbles in the fuel will also increase the volume of the fuel. However, after the fuel enters the vehicle, the bubbles will slowly dissipate, which will cause the fuel flow measured by the piston flowmeter to deviate from the actual fuel flow added to the vehicle, thereby causing losses to customers. Summary of the invention

[0004] The object of the present invention is to provide a piston flow meter suitable for a fuel dispenser, which performs centrifugal defoaming operation on the fuel during its flow by rotating the stirring blades, and discharges the defoamed gas through components such as an exhaust pipe, thereby increasing the accuracy of the piston flow meter in measuring fuel.

[0005] In order to achieve the above-mentioned invention object, the present invention adopts the following technical scheme: The present invention provides a piston flow meter suitable for a fuel dispenser, comprising: a main body, a bottom cover fixedly mounted on the bottom of the main body by the cooperation of bolts and nuts, the bottom cover is used to seal the bottom of the main body, a liquid inlet is mounted on the surface of the main body, and a liquid discharge port is mounted on the surface of the main body away from the liquid inlet. A defoaming mechanism is installed inside the main body, a flow meter is installed on the top of the main body, an extrusion chamber is opened inside the main body near the defoaming mechanism, a piston is movably connected inside the extrusion chamber, the top of the piston is connected to the top of the extrusion chamber through a return spring, a push rod is installed on the top of the piston, and the piston is connected to the flow meter through the push rod; The defoaming mechanism comprises a defoaming component rotatably mounted inside the main body, a drain component is mounted on the top of the defoaming component, and an exhaust component is mounted on the top of the drain component; The defoaming component includes a stirring blade rotatably installed on the inner side of the main body and a fixedly installed spring. The stirring blade can rotate through the operation of a driving member to stir the fuel, so that the fuel forms a centrifugal rotation state to make the internal tiny bubbles approach the central axis of the main body, and the spring can vibrate to break the bubbles inside the fuel.

[0006] Preferably, a defoaming chamber is provided inside the main body, and the defoaming chamber is annularly sleeved on the outside of the extrusion chamber, and a rotating drum is rotatably connected to the inner side of the defoaming chamber. A driving motor is fixedly installed inside the main body through an assembly groove, and a gear 1 is fixedly connected to the output end of the driving motor.

[0007] Preferably, a tooth groove matching the gear is formed on the inner side of the rotating drum, a plurality of groups of stirring blades are fixedly connected to the outer surface of the rotating drum in a circular array, a mounting frame is fixedly connected to the outer surface of the rotating drum between adjacent stirring blades, and a fixing plate is fixedly connected to the upper and lower parts of the mounting frame.

[0008] Preferably, a rotating shaft is rotatably connected between the two groups of fixed plates via a bearing, a plurality of groups of spring plates are fixed on the side surface of the rotating shaft in a circular array, a protrusion is fixedly connected to the end of the spring plate, a gear 2 is installed on the top of the rotating shaft, and a guide groove is opened near the top of the gear 2 in the defoaming chamber.

[0009] Preferably, a tooth groove matching the gear 2 is provided on the inner side of the guide groove, and the guide groove is in the shape of a ring with the left side lower and the right side higher. The guide groove is used to guide the gas-liquid mixed phase upward, and a circulation groove is provided inside the main body near the liquid inlet. A diverter block is installed at the connection between the liquid inlet and the circulation groove, and a plurality of groups of liquid inlet holes are provided on the inner side of the circulation groove in the form of a ring array.

[0010] Preferably, the drainage assembly includes an overflow groove opened on the inner side of the main body, and an overflow pipe is rotatably installed inside the main body between the overflow groove and the guide groove through an assembly groove, the top end of the overflow pipe is connected to the bottom of the overflow groove, and the bottom end of the overflow pipe is connected to the top of the guide groove.

[0011] Preferably, a plurality of groups of centrifugal blades are installed in a circular array on the inner side of the overflow pipe, a reflux groove is opened inside the main body, the top of the reflux groove is connected to the bottom of the overflow groove, and the bottom of the reflux groove is connected to the connection between the defoaming chamber and the extrusion chamber.

[0012] Preferably, an impeller one is rotatably installed on the inner side of the reflux groove through an assembly groove, and a tooth block one matching the tooth groove on the inner side of the rotating drum is fixedly connected to the outer circumference of the impeller one, and a gear three is rotatably installed on the inside of the main body of the rotating drum adjacent to the overflow pipe through an assembly groove, and a tooth groove matching the gear three is provided on the outer circumference of the rotating drum, and a tooth groove matching the gear three is provided on the outer circumference of the overflow pipe.

[0013] Preferably, the exhaust assembly includes an exhaust pipe connected through the top of the overflow tank, a liquid blocking port is fixedly connected to the inner side of the exhaust pipe, the bottom end of the exhaust pipe extends to the inner side of the overflow pipe, an exhaust port is installed at the top of the exhaust pipe, and an impeller 2 is rotatably installed on the inner side of the exhaust port through an assembly groove.

[0014] Preferably, a toothed disc is fixedly installed at the end of the impeller 2, a rotating rod is rotatably installed through an assembly groove between the exhaust port and the liquid inlet, a plurality of groups of blades are fixed on the outer peripheral surface of the rotating rod near the liquid inlet in a circular array, a gear 4 matching the toothed disc is installed on the top of the rotating rod near the exhaust port, and an exhaust valve is rotatably installed inside the exhaust port.

[0015] Compared with the prior art, one or more of the above technical solutions have the following beneficial effects: 1. A driving motor is provided to drive the drum, stirring blades and mounting frame to rotate through the cooperation of gear 1 and tooth grooves. When the stirring blades rotate, the fuel in the defoaming chamber can be stirred to make it rotate centrifugally. When the fuel rotates centrifugally, the liquid will disperse to the outside of the defoaming chamber and enter the extrusion chamber through the bottom, while the gas will gather to the center of the defoaming chamber. At the same time, the spring piece on the mounting frame can rotate through the cooperation of gear 2 and tooth grooves. When the spring piece rotates, it can drive the bump to collide with the mounting frame. When the bump collides, the spring piece will vibrate. When the spring piece vibrates, it can break the bubbles in the fuel. When the fuel dispenser adds fuel to the vehicle, the bubbles in the fuel can be eliminated through the defoaming component, so that the flow calculated by the piston flowmeter after the bubbles in the fuel are eliminated is the same as the flow actually added by the vehicle; 2. After the bubbles are broken, the gas can enter the overflow pipe through the guide groove. At the same time, a small amount of fuel can be squeezed in the opposite direction by the piston and follow the gas into the overflow pipe. When the gas and liquid enter the overflow pipe, the overflow pipe can rotate with the drum through gear three. When the overflow pipe rotates, it will drive the inner centrifugal blades to rotate. When the centrifugal blades rotate, the fuel inside can be centrifuged. When the fuel is centrifuged, the gas can enter the exhaust component. The fuel will enter the overflow tank through the upper edge of the overflow pipe. After the fuel enters the overflow tank, the impeller rotates to discharge the fuel inside the overflow tank through the reflux groove into the extrusion chamber, so that the fuel can flow back to the extrusion chamber after the bubbles inside the fuel are eliminated. 3. When the fuel enters the liquid inlet, the blades can drive the rotating rod to rotate. When the rotating rod rotates, the cooperation of gear four and the toothed disc can drive impeller two to rotate. The rotation of impeller two will generate suction. The suction of impeller two can discharge the gas inside the overflow pipe to the exhaust port through the exhaust pipe, so that the separated gas can be discharged quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a schematic diagram of the three-dimensional cross-sectional structure of the present invention at a first viewing angle; Figure 3 It is a schematic diagram of the three-dimensional cross-sectional structure of the present invention at a second viewing angle; Figure 4 It is a partially enlarged three-dimensional structural schematic diagram of the defoaming component of the present invention; Figure 5 The present invention Figure 4 A schematic diagram of the enlarged structure of part A; Figure 6 The present invention Figure 2 A schematic diagram of the enlarged structure of part B; Figure 7 The present invention Figure 3 A schematic diagram of the enlarged structure of part C; In the figure: 1, main body; 2, bottom cover; 3, liquid inlet; 4, liquid discharge port; 5, defoaming mechanism; 51, defoaming assembly; 511, defoaming chamber; 512, drum; 513, driving motor; 514, gear 1; 515, stirring blade; 516, mounting frame; 517, fixing plate; 518, rotating shaft; 519, spring; 5110, convex block; 5111, gear 2; 5112, guide groove; 5113, circulation groove; 5114, diverter block; 52, liquid discharge assembly; 5 21. Overflow tank; 522. Overflow pipe; 523. Centrifugal blade; 524. Reflux tank; 525. Impeller 1; 526. Tooth block 1; 527. Gear 3; 53. Exhaust assembly; 531. Exhaust pipe; 532. Liquid blocking port; 533. Exhaust port; 534. Impeller 2; 535. Tooth disc; 536. Rotating rod; 537. Blade; 538. Gear 4; 539. Exhaust valve; 6. Flow meter; 7. Extrusion chamber; 8. Piston; 9. Return spring; 10. Push rod. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or vehicle that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or vehicles.

[0020] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "liquid level", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0021] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0022] In addition, the terms "installed", "set", "provided with", "connected", "connected", and "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0023] See also Figure 1 and Figure 2 The present invention provides an embodiment: a piston flowmeter suitable for a fuel dispenser, comprising: a main body 1, a bottom cover 2 is fixedly installed on the bottom of the main body 1 by the cooperation of bolts and nuts, the bottom cover 2 is used to seal the bottom of the main body 1, a liquid inlet 3 is installed on the surface of the main body 1, a liquid discharge port 4 is installed on the surface of the main body 1 away from the liquid inlet 3, a defoaming mechanism 5 is installed inside the main body 1, a flowmeter 6 is installed on the top of the main body 1, an extrusion chamber 7 is opened inside the main body 1 near the defoaming mechanism 5, a piston 8 is movably connected inside the extrusion chamber 7, the top of the piston 8 is connected to the top of the extrusion chamber 7 by a reset spring 9, a push rod 10 is installed on the top of the piston 8, and the piston 8 is connected to the flowmeter 6 through the push rod 10.

[0024] It should be understood that the piston flow meter should be installed on the fuel dispenser before use. The piston flow meter can be used after installation. The fuel can enter the defoaming mechanism 5 through the liquid inlet 3. The defoaming mechanism 5 can eliminate the bubbles generated by the fuel during the flow. After the bubbles are eliminated, the fuel can be transported to the inside of the extrusion chamber 7. When the fuel enters the extrusion chamber 7, it will generate upward pressure to push the piston 8. When the piston 8 is pushed, it can slide upward inside the extrusion chamber 7. When the piston 8 slides upward, it can squeeze the return spring 9 and drive the push rod 10 to contact the flow meter 6. When the push rod 10 contacts the flow meter 6, the flow of the fuel will be measured. At the same time, the fuel can be discharged through the drain port 4. The discharge of the fuel will add fuel to the vehicle.

[0025] like Figure 1 , Figure 3-Figure 6As shown, the defoaming mechanism 5 includes a defoaming component 51 rotatably mounted inside the main body 1, and the defoaming component 51 includes a stirring blade 515 rotatably mounted on the inner side of the main body 1 and a fixedly mounted shrapnel 519. The stirring blade 515 can be rotated by the operation of the driving member to stir the fuel, so that the fuel forms a centrifugal rotation state to make the internal tiny bubbles close to the central axis of the main body 1, and the shrapnel 519 can vibrate to break the bubbles inside the fuel. A defoaming chamber 511 is provided inside the main body 1, and the defoaming chamber 511 is annularly sleeved on the outer side of the extrusion chamber 7. A rotating drum 512 is rotatably connected to the inner side of the defoaming chamber 511. A driving motor 513 is fixedly mounted inside the main body 1 through an assembly groove, and a gear 514 is fixedly connected to the output end of the driving motor 513. A tooth groove matching the gear 514 is provided on the inner side of the rotating drum 512. A plurality of groups of stirring blades 515 are fixedly connected to the outer surface of the rotating drum 512 in a circular array. Adjacent stirring blades 515 are connected to the outer surface of the rotating drum 512 in a circular array. The outer surface of the rotating drum 512 is fixedly connected with a mounting frame 516, and the upper and lower parts of the mounting frame 516 are fixedly connected with a fixing plate 517. A rotating shaft 518 is rotatably connected through a bearing between the two sets of fixing plates 517. A plurality of sets of spring pieces 519 are fixedly connected to the side surface of the rotating shaft 518 in a circular array. The ends of the spring pieces 519 are fixedly connected with a protrusion 5110. A gear 2 5111 is installed at the top of the rotating shaft 518. The defoaming chamber 511 is close to the gear 2 5111. A guide groove 5112 is provided on the top of 11, and a tooth groove matching the gear 2 5111 is provided on the inner side of the guide groove 5112. The guide groove 5112 is in the shape of a ring with the left side lower and the right side higher. The guide groove 5112 is used to guide the gas-liquid mixed phase upward. A circulation groove 5113 is provided inside the main body 1 near the liquid inlet 3, and a diverter block 5114 is installed at the connection between the liquid inlet 3 and the circulation groove 5113. A plurality of groups of liquid inlet holes are provided on the inner side of the circulation groove 5113 in the form of a ring array.

[0026] It is worth noting that the fuel dispenser can transport the fuel to the inside of the liquid inlet 3, and the liquid inlet 3 will transport the fuel to the inside of the annular groove 5113. When the fuel enters the annular groove 5113, it will pass through the diverter block 5114 to guide the fuel. After the fuel is guided, it can obliquely enter the inside of the annular groove 5113. The annular groove 5113 can evenly spray the fuel into the defoaming chamber 511 through the liquid inlet hole. At the same time, the driving motor 513 can drive the gear 1 514 to rotate. When the gear 1 514 rotates, it can drive the rotating drum 512 to rotate through the cooperation of the tooth groove. When the rotating drum 512 rotates, it can drive the stirring blade 515 and the mounting frame 516 to rotate. When the stirring blade 515 rotates, it can stir the fuel. After the fuel is stirred, it will rotate centrifugally. When the fuel rotates centrifugally, the liquid will disperse to the outside of the defoaming chamber 511 and enter the extrusion chamber 7 through the bottom, while the gas will gather to the center of the defoaming chamber 511. When the mounting frame 516 rotates, it will drive the rotating shaft The gear 518 and the second gear 5111 rotate around the rotating drum 512. When the second gear 5111 rotates, it can rotate inside the guide groove 5112. When the second gear 5111 rotates, it can mesh and rotate through the cooperation of the tooth groove inside the guide groove 5112. When the second gear 5111 meshes and rotates, it can drive the rotating shaft 518 to rotate. When the rotating shaft 518 rotates, it can drive the spring piece 519 to rotate. When the spring piece 519 rotates, it can drive the protrusion 5110 to rotate. The protrusion 5110 When 10 rotates, it can collide with the mounting frame 516. When the protrusion 5110 collides with the mounting frame 516, it will cause the shrapnel 519 to vibrate. When the shrapnel 519 vibrates, it will break the bubbles inside the fuel. The separated gas and the broken gas will flow upward to the inside of the guide groove 5112, and a small amount of fuel will also flow into the inside of the guide groove 5112. The guide groove 5112 will transport the gas and liquid to the inside of the overflow pipe 522 through its own shape of being low on the left and high on the right.

[0027] like Figure 1 , Figure 3 and Figure 6As shown, a drain assembly 52 is installed on the top of the defoaming assembly 51, and the drain assembly 52 includes an overflow groove 521 opened on the inner side of the main body 1, and an overflow pipe 522 is rotatably installed inside the main body 1 between the overflow groove 521 and the guide groove 5112 through an assembly groove, and the top of the overflow pipe 522 is connected to the bottom of the overflow groove 521, and the bottom of the overflow pipe 522 is connected to the top of the guide groove 5112. A plurality of groups of centrifugal blades 523 are installed in a circular array on the inner side of the overflow pipe 522, and a reflux groove 524 is opened inside the main body 1, and the top of the reflux groove 524 is connected to the overflow groove 521. The bottom of the groove 521 is connected, the bottom end of the reflux groove 524 is connected to the connection between the defoaming chamber 511 and the extrusion chamber 7, the inner side of the reflux groove 524 is rotatably installed with an impeller 525 through an assembly groove, the outer circumference of the impeller 525 is fixedly connected with a tooth block 526 matching the tooth groove inside the rotating drum 512, the inside of the main body 1 adjacent to the rotating drum 512 and the overflow pipe 522 is rotatably installed with a gear three 527 through an assembly groove, the outer circumference of the rotating drum 512 is provided with a tooth groove matching the gear three 527, and the outer circumference of the overflow pipe 522 is provided with a tooth groove matching the gear three 527.

[0028] It can be imagined that the guide groove 5112 will transport the gas and liquid to the inside of the overflow pipe 522 through its shape of being lower on the left and higher on the right. At the same time, the rotating drum 512 can drive the gear 3 527 to mesh and rotate through the tooth grooves on the outer surface. When the gear 3 527 meshes and rotates, it can drive the overflow pipe 522 to rotate through the cooperation of the tooth grooves on the surface of the overflow pipe 522. When the overflow pipe 522 rotates, it can drive the centrifugal blade 523 to rotate. When the centrifugal blade 523 rotates, it can pump the fuel inside the overflow pipe 522. The centrifugal operation is performed. When the fuel is centrifuged, the fuel can flow into the overflow groove 521 through the upper edge of the overflow pipe 522. At the same time, when the drum 512 rotates, the tooth block 526 can be driven to mesh and rotate through the inner tooth groove. When the tooth block 526 meshes and rotates, it can drive the impeller 525 to rotate. When the impeller 525 rotates, the fuel inside the overflow groove 521 can be discharged into the extrusion chamber 7 through the reflux groove 524. When the centrifugal blades 523 centrifuge the fuel, the gas can enter the exhaust component 53.

[0029] like Figure 1 , Figure 3 and Figure 7As shown, an exhaust component 53 is installed on the top of the discharge component 52, and the exhaust component 53 includes an exhaust pipe 531 which is connected to the top of the overflow groove 521, and a liquid blocking port 532 is fixedly connected to the inner side of the exhaust pipe 531. The bottom end of the exhaust pipe 531 extends to the inner side of the overflow pipe 522, and an exhaust port 533 is installed at the top of the exhaust pipe 531. An impeller 2 534 is rotatably installed on the inner side of the exhaust port 533 through an assembly groove, and a toothed disk 535 is fixedly installed on the end of the impeller 2 534. A rotating rod 536 is rotatably installed between the exhaust port 533 and the liquid inlet 3 through the assembly groove, and a plurality of groups of blades 537 are fixed on the outer peripheral surface of the rotating rod 536 near the liquid inlet 3 in a circular array. A gear 4 538 matching the toothed disk 535 is installed near the top of the rotating rod 536 near the exhaust port 533, and an exhaust valve 539 is rotatably installed inside the exhaust port 533.

[0030] It can be understood that when the fuel enters the liquid inlet 3, it can drive the blade 537 to rotate, and when the blade 537 rotates, it can drive the rotating rod 536 to rotate, and when the rotating rod 536 rotates, it can drive the gear four 538 to rotate, and when the gear four 538 rotates, it can drive the toothed disc 535 to mesh and rotate, and when the toothed disc 535 meshes and rotates, it can drive the impeller two 534 to rotate. The rotation of the impeller two 534 will generate suction, and the suction of the impeller two 534 can open the exhaust valve 539. After the exhaust valve 539 is opened, the suction of the impeller two 534 can suck the gas inside the overflow pipe 522 into the exhaust pipe 531. When the gas enters the exhaust pipe 531, the liquid blocking port 532 can block the fuel, and the gas will be discharged through the exhaust port 533. When the liquid inlet 3 is filled with oil, the exhaust valve 539 will be closed by its own weight to prevent foreign matter from entering the inside of the main body 1.

[0031] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A piston flow meter suitable for a fuel dispenser, comprising: A main body (1), a bottom cover (2) is fixedly mounted on the bottom of the main body (1) by means of bolts and nuts, the bottom cover (2) is used to seal the bottom of the main body (1), a liquid inlet (3) is mounted on the surface of the main body (1), and a liquid discharge port (4) is mounted on the surface of the main body (1) away from the liquid inlet (3), characterized in that: A defoaming mechanism (5) is installed inside the main body (1), a flow meter (6) is installed on the top of the main body (1), an extrusion chamber (7) is provided inside the main body (1) near the defoaming mechanism (5), a piston (8) is movably connected inside the extrusion chamber (7), the top of the piston (8) is connected to the top of the extrusion chamber (7) via a return spring (9), a push rod (10) is installed on the top of the piston (8), and the piston (8) is connected to the flow meter (6) via the push rod (10); The defoaming mechanism (5) comprises a defoaming component (51) rotatably mounted inside the main body (1), a liquid discharge component (52) being mounted on the top of the defoaming component (51), and an exhaust component (53) being mounted on the top of the liquid discharge component (52); The defoaming component (51) comprises a stirring blade (515) rotatably mounted on the inner side of the main body (1) and a spring sheet (519) fixedly mounted thereon. The stirring blade (515) is used to stir the fuel so that the fuel rotates centrifugally outward, thereby squeezing bubbles inside the fuel so that the bubbles move inward.

2. The piston flow meter for a fuel dispenser according to claim 1, characterized in that: A defoaming chamber (511) is provided inside the main body (1), the defoaming chamber (511) is sleeved on the outside of the extrusion chamber (7) in an annular manner, a rotating drum (512) is rotatably connected to the inside of the defoaming chamber (511), a driving motor (513) is fixedly installed inside the main body (1) via an assembly groove, and a gear 1 (514) is fixedly connected to the output end of the driving motor (513).

3. The piston flow meter for a fuel dispenser according to claim 2, characterized in that: The inner side of the rotating drum (512) is provided with tooth grooves matching the gear 1 (514); the outer surface of the rotating drum (512) is fixedly connected to a plurality of groups of stirring blades (515) in a circular array; the outer surface of the rotating drum (512) between adjacent stirring blades (515) is fixedly connected to a mounting frame (516); the upper and lower parts of the mounting frame (516) are fixedly connected to a fixing plate (517).

4. The piston flow meter for a fuel dispenser according to claim 3, characterized in that: A rotating shaft (518) is rotatably connected between the two groups of fixed plates (517) via a bearing, a plurality of groups of spring sheets (519) are fixed to the side surface of the rotating shaft (518) in a circular array, a protrusion (5110) is fixedly connected to the end of the spring sheet (519), a second gear (5111) is installed at the top of the rotating shaft (518), and a guide groove (5112) is provided near the top of the second gear (5111) in the defoaming chamber (511).

5. The piston flow meter for a fuel dispenser according to claim 4, characterized in that: The inner side of the guide groove (5112) is provided with a tooth groove matching the gear 2 (5111); the guide groove (5112) is in the shape of a ring with a lower left side and a higher right side; the guide groove (5112) is used to guide the gas-liquid mixed phase upward; the inner side of the main body (1) near the liquid inlet (3) is provided with a circulation groove (5113); a diverter block (5114) is installed at the connection between the liquid inlet (3) and the circulation groove (5113); and the inner side of the circulation groove (5113) is provided with a plurality of groups of liquid inlet holes in the form of a ring array.

6. The piston flow meter for a fuel dispenser according to claim 2, characterized in that: The liquid discharge assembly (52) comprises an overflow groove (521) provided on the inner side of the main body (1); an overflow pipe (522) is rotatably mounted inside the main body (1) between the overflow groove (521) and the guide groove (5112) via an assembly groove; the top end of the overflow pipe (522) is connected to the bottom of the overflow groove (521), and the bottom end of the overflow pipe (522) is connected to the top of the guide groove (5112).

7. The piston flow meter for a fuel dispenser according to claim 6, characterized in that: A plurality of groups of centrifugal blades (523) are installed in a circular array on the inner side of the overflow pipe (522); a reflux groove (524) is provided inside the main body (1); the top end of the reflux groove (524) is connected to the bottom of the overflow groove (521); and the bottom end of the reflux groove (524) is connected to the connection between the defoaming chamber (511) and the extrusion chamber (7).

8. The piston flow meter for a fuel dispenser according to claim 7, characterized in that: An impeller 1 (525) is rotatably mounted on the inner side of the reflux groove (524) via an assembly groove, and a tooth block 1 (526) matching the tooth groove inside the rotating drum (512) is fixedly connected to the outer peripheral surface of the impeller 1 (525), and a gear 3 (527) is rotatably mounted on the inner side of the main body (1) of the rotating drum (512) adjacent to the overflow pipe (522) via an assembly groove, and a tooth groove matching the gear 3 (527) is provided on the outer peripheral surface of the rotating drum (512), and a tooth groove matching the gear 3 (527) is provided on the outer peripheral surface of the overflow pipe (522).

9. The piston flow meter for a fuel dispenser according to claim 6, characterized in that: The exhaust assembly (53) comprises an exhaust pipe (531) penetrating and connected to the top of the overflow tank (521); a liquid blocking port (532) is fixedly connected to the inner side of the exhaust pipe (531); the bottom end of the exhaust pipe (531) extends to the inner side of the overflow pipe (522); an exhaust port (533) is installed at the top end of the exhaust pipe (531); and an impeller 2 (534) is rotatably installed on the inner side of the exhaust port (533) through an assembly groove.

10. The piston flow meter suitable for a fuel dispenser according to claim 9, characterized in that: A toothed disc (535) is fixedly mounted on the end of the second impeller (534); a rotating rod (536) is rotatably mounted through an assembly groove between the exhaust port (533) and the liquid inlet (3); a plurality of groups of blades (537) are fixed in a circular array on the outer peripheral surface of the rotating rod (536) near the liquid inlet (3); a gear (538) matching the toothed disc (535) is mounted on the top end of the rotating rod (536) near the exhaust port (533); and an exhaust valve (539) is rotatably mounted inside the exhaust port (533).

Images