CN212202460U - Gear pump for fuel dispenser - Google Patents

Abstract

The utility model relates to a gear pump for fuel tanker aircraft belongs to gear pump technical field. The gear pump comprises a pump body, a pump core and an oil-gas separator, wherein an oil inlet, an oil outlet and an exhaust port are formed in the pump body, and an oil inlet cavity, an oil outlet cavity and a normal pressure cavity are formed in the pump body; the pump core is arranged in the pump body, and the oil inlet side of the pump core is communicated with the oil inlet cavity; oil and gas separator sets up in the pump body and includes an oil-gas separation section of thick bamboo and hydrocyclone end cover, the vertical setting of the central axis of an oil-gas separation section of thick bamboo, the hydrocyclone end cover is connected in the upper end of an oil-gas separation section of thick bamboo, the hydrocyclone end cover is used for leading the fluid of the side of producing oil of pump core to an oil-gas separation section of thick bamboo in, and make fluid be the spiral downward flow along the inner wall of an oil-gas separation section of thick bamboo, oil and gas separator's liquid outlet setting is on oil-gas separation section of thick bamboo's lateral wall and with the chamber intercommunication that produces oil, oil and gas separator. This gear pump, oil-gas separation effect preferred, the fluid that the gear pump was pumped does not contain gas, keeps the measurement accuracy.

Description

Gear pump for fuel dispenser

Technical Field

The application relates to the technical field of gear pumps, in particular to a gear pump for a fuel dispenser.

Background

The self-priming gear pump is one of the very important parts in the oiling machine and provides power for oil metering of the oiling machine. A gear pump generally includes a pump body, and a drive gear and a driven gear housed in the pump body. The driving gear is meshed with the driven gear, and when the driving gear and the driven gear rotate, the teeth of the driving gear and the teeth of the driven gear are continuously meshed and separated, so that the working volume between the pump body and the meshed gear is changed, and liquid conveying or liquid pressure increase is realized.

The oil-gas separation cavity horizontal direction setting of current gear pump (the utility model discloses a an oil-gas separation cavity for in gear pump of fuel tanker aircraft as application number CN 01273332.6), the fluid export of oil-gas separation cavity is located the top of oil-gas separation cavity, the gas outlet level setting of oil-gas separation cavity, the oil-gas separation ability of this kind of gear pump is poor, can separate the gas that accounts for fluid volume 30% under the normal operating mode, if the excess air gets into then more gas from the oil gun mouth discharge through the flowmeter, influence the measurement accuracy.

SUMMERY OF THE UTILITY MODEL

An object of this application provides a gear pump for fuel tanker aircraft, oil-gas separation effect preferred, and the fluid that the gear pump was pumped does not contain gas, keeps the measurement accuracy.

A gear pump for a fuel dispenser according to an embodiment of an aspect of the present application, the gear pump comprising:

the oil pump comprises a pump body, wherein an oil inlet, an oil outlet and an exhaust port are formed in the pump body, and an oil inlet cavity communicated with the oil inlet, an oil outlet cavity communicated with the oil outlet and a normal pressure cavity communicated with the exhaust port are formed in the pump body;

the pump core is arranged in the pump body, and the oil inlet side of the pump core is communicated with the oil inlet cavity;

oil and gas separator, oil and gas separator sets up in the pump body and includes an oil-gas separation section of thick bamboo and liquid end cover soon, the vertical setting of the central axis of an oil-gas separation section of thick bamboo, liquid end cover soon is connected in oil-gas separation section of thick bamboo's upper end, liquid end cover soon is used for leading the fluid of the side of producing oil of pump core to an oil-gas separation section of thick bamboo in, and make fluid be the spiral downward flow along oil-gas separation section of thick bamboo's inner wall, oil and gas separator's liquid outlet setting just communicates with the chamber of producing oil on oil-gas separation section of thick bamboo's lateral wall, oil and gas separator.

According to the gear pump for fuel dispenser of the embodiment of the application, the oil and gas separator is vertical to be set up, fluid gets into via oil and gas separator's upper end, and be spiral downward flow, because gas proportion is less than fluid, receive centrifugal force less and gather near oil and gas separator the central axis, gas (oil-gas mixture) that have partial fluid get into the atmospheric pressure chamber through the gas outlet on the central axis of oil-gas separation section of thick bamboo, the pure fluid of separation gets into out the oil pocket because the liquid outlet that gravity influence downward flow and follow the lateral wall, thereby realize oil-gas separation in oil and gas separator, oil-gas separation effect preferred. This gear pump, oil-gas separation ability is stronger, and oil-gas separation is more thorough, keeps the measurement precision.

In addition, the gear pump for the fuel dispenser according to the embodiment of the application has the following additional technical characteristics:

according to some embodiments of the application, the gas outlet is provided on the hydrocyclone endcover.

In the above embodiment, the gas outlet is arranged above the oil-gas separation cylinder, after oil is separated in the oil-gas separation cylinder, the oil-gas mixture flows upwards under the action of oil pressure, and is discharged out of the oil-gas separator from the gas outlet, so that oil-gas separation is facilitated.

In some embodiments of the present application, a spiral diversion trench is disposed on the cyclone end cover, an inlet end of the spiral diversion trench is communicated with an oil outlet side of the pump core, and an outlet end of the spiral diversion trench is communicated with an inner cavity of the oil-gas separation barrel.

In the above embodiment, the spiral diversion trench is arranged on the cyclone end cover, so that the oil liquid forms a spiral flow state after being guided by the spiral diversion trench and enters the oil-gas separation cylinder, the oil liquid is separated from the oil gas separation cylinder by centrifugal force, the oil-gas separation effect of the oil liquid in the oil-gas separation cylinder is enhanced, and the oil-gas separation of the oil liquid is more thorough.

Optionally, the inlet end of the spiral flow guide groove is arranged on the side wall of the cyclone end cover, and the gas outlet is arranged on the top wall of the cyclone end cover.

In the above embodiment, the inlet end of the spiral diversion trench is arranged on the side wall of the hydrocyclone end cover, so that the path of oil in the spiral diversion trench is increased, and the flow velocity of the oil entering the oil-gas separation cylinder is increased conveniently; the gas outlet sets up on the roof of hydrocyclone end cover, and oil-gas mixture upward movement, fluid downstream is convenient for oil-gas separation is more thorough.

Optionally, the spiral flow leader decreases in cross-sectional area from the inlet end to the outlet end.

In the above embodiment, the change of the sectional area of the spiral diversion trench gradually increases the speed of the oil from the oil outlet side of the pump core to the oil-gas separation cylinder, so that the oil can form a high-speed spiral flow in the oil-gas separation cylinder, and the oil-gas separation capacity of the oil can be improved.

Optionally, a communicating cavity is further formed in the pump body, the oil outlet side of the pump core is communicated with the inlet end of the spiral diversion trench through the communicating cavity, and the sectional area of the communicating cavity is gradually reduced from the oil outlet side to the inlet end.

In the above embodiment, the communication between the oil outlet side of the pump core and the spiral diversion trench is realized through the communication cavity, so that the diversion of the oil liquid is facilitated; the change of the sectional area of the communicating cavity improves the flow velocity of the oil liquid.

According to some embodiments of the application, the liquid outlet is located at a lower end of the oil and gas separation barrel.

In the above embodiment, the liquid outlet is located at the lower end of the oil-gas separation cylinder, and the liquid outlet and the inlet of the oil-gas separator are respectively located at the upper end and the lower end of the oil-gas separation cylinder, so that a longer flow path of oil liquid in the oil-gas separator is ensured, and further separation of oil gas is facilitated.

According to some embodiments of the application, the oil-gas separation section of thick bamboo includes barrel and go-between, and the go-between cover is located the barrel and is located the upper end of barrel, revolves liquid end cover and is connected with go-between detachably.

In the above embodiment, the arrangement of the connecting ring facilitates the assembly of the hydrocyclone end cover and the cylinder body, and improves the assembly and maintenance efficiency of the hydrocyclone end cover.

According to some embodiments of the application, the gear pump further comprises an overflow valve, the oil outlet cavity is communicated with the oil inlet cavity through the overflow valve, and the opening pressure of the overflow valve is adjustable.

In the above embodiment, the overflow valve is arranged to limit the highest pressure of the oil pumping system, so that the control of the pumping pressure of the gear pump is facilitated, the oil partially overflows or completely overflows when the load changes, and the pumping stability of the gear pump is ensured.

According to some embodiments of the present application, a flow guide opening communicated with the oil inlet chamber is provided on a chamber wall of the atmospheric chamber, and the flow guide opening is opened or closed by a float valve.

In the above embodiment, the float valve is arranged to realize the backflow of the oil to the oil inlet chamber for the secondary delivery after a certain amount of oil is accumulated in the normal pressure chamber.

Additional aspects and advantages of the present application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the present application.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.

FIG. 1 is an exploded view of a gear pump for a fuel dispenser provided in accordance with an embodiment of the present application;

FIG. 2 is a front view of a gear pump for a fuel dispenser as provided by an embodiment of the present application;

FIG. 3 is a sectional view taken along line II-II of FIG. 2;

figure 4 is a schematic structural view (in cross-section) of a pump core of a gear pump for a fuel dispenser provided in an embodiment of the present application;

figure 5 is a cross-sectional view of an air-oil separator of a gear pump for a fuel dispenser provided in an embodiment of the present application (showing an assembly view of an air-oil separator vent);

FIG. 6 is a left side view of a gear pump for a fuel dispenser provided in accordance with an embodiment of the present application (with the pump top cover and pump core hidden);

FIG. 7 is a cross-sectional view taken in the direction VI-VI of FIG. 6;

FIG. 8 is a schematic view of the inlet of the air-oil separator of the gear pump for a fuel dispenser provided in an embodiment of the present application;

FIG. 9 is a perspective view (with the pump body hidden) of the air-fuel separator and vent of the gear pump for a fuel dispenser provided in an embodiment of the present application;

FIG. 10 is an enlarged view of a portion of FIG. 5 at X;

figure 11 is a schematic illustration of a maximum flow area condition of the valve port of the vent apparatus of the gear pump for a fuel dispenser as provided by an embodiment of the present application;

figure 12 is a schematic illustration of the mounting position of the float valve of the gear pump for a fuel dispenser as provided by an embodiment of the present application;

figure 13 is a cross-sectional view of a float valve of a gear pump for a fuel dispenser provided in an embodiment of the present application.

Icon: 1-a gear pump; 100-a pump body; 101-an oil inlet; 102-an oil outlet; 103-an exhaust port; 104-an oil inlet cavity; 105-an oil outlet chamber; 106-atmospheric chamber; 107-first side opening; 108-a second side opening; 109-a communicating chamber; 111-positioning the mounting plate; 112-a limit mounting part; 113-a position-defining flange; 114-a first flow guide port; 120-a pump body; 130-pump upper cover; 140-pump bottom cover; 141-a flow guide channel; 200-pump core; 210-internal gear; 220-an outer gear; 230-a cover; 300-an oil-gas separator; 301-a liquid outlet; 302-gas outlet; 310-an oil-gas separation cylinder; 311-cylinder body; 312-a connecting ring; 330-hydrocyclone end cap; 331-spiral flow guide groove; 332-cylindrical draft grooves; 400-relief valve; 500-an exhaust; 510-a valve cartridge; 511-valve port; 512-a first limit step; 513-a connecting portion; 520-a valve core; 521-a second limit step; 530-a spring; 600-a float valve; 610-sealing sheet; 620-float; 621-connecting lug; 630-adjusting screw; 631-a limiting part; 632-a gasket; 640-a mounting seat; 641-a reflow hole; 650-guide bar; 660 — adjusting the spring.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present application, it should be noted that the terms "inside", "outside", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the application usually place when using, and are only used for convenience in describing the present application and simplifying the description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.

A gear pump 1 for a fuel dispenser according to an embodiment of an aspect of the present application is described below with reference to the drawings.

As shown in fig. 1 to 4, a gear pump 1 for a fuel dispenser according to an embodiment of the present application includes: pump body 100, pump core 200 and gas-oil separator 300.

Specifically, the pump body 100 is used for carrying components such as the pump cartridge 200 and the gas-oil separator 300, and has a plurality of chambers to meet different accommodation requirements. An oil inlet 101, an oil outlet 102 and an air outlet 103 are arranged on the pump body 100, the oil inlet 101 is communicated with an oil liquid source, the oil outlet 102 is communicated with an oil filling gun, and the air outlet 103 is communicated with the atmosphere; an oil inlet cavity 104, an oil outlet cavity 105 and a normal pressure cavity 106 are arranged in the pump body 100, wherein the oil inlet cavity 104 is communicated with the oil inlet 101 and is used for storing oil input into the pump body 100 from an oil source; the oil outlet cavity 105 is communicated with the oil outlet 102 and is used for storing the pure oil liquid separated by the oil-gas separator 300; the atmospheric pressure chamber 106 is communicated with the exhaust port 103 and is used for storing the oil-gas mixture separated by the oil-gas separator 300, so that oil is accumulated in the atmospheric pressure chamber 106, and gas is exhausted from the exhaust port 103. The pump core 200 is disposed in the pump body 100, an oil inlet side of the pump core 200 is communicated with the oil inlet cavity 104, oil is delivered to the pump core 200 through the oil inlet cavity 104, and the oil is pumped to the oil-gas separator 300 from an oil outlet side of the pump core 200 under the action of the pump core 200. The oil-gas separator 300 is arranged in the pump body 100, as shown in fig. 5, the oil-gas separator 300 includes an oil-gas separation cylinder 310 and a cyclone end cover 330, the central axis of the oil-gas separation cylinder 310 is vertically arranged, the cyclone end cover 330 is connected to the upper end of the oil-gas separation cylinder 310, the cyclone end cover 330 is used for guiding oil on the oil outlet side of the pump core 200 into the oil-gas separation cylinder 310 and making the oil spirally move downwards along the inner wall of the oil-gas separation cylinder 310, the oil is subjected to oil-gas separation under the centrifugal force, the separated pure oil flows downwards along the inner wall of the oil-gas separation cylinder 310 under the gravity action and enters the oil outlet cavity 105 from a liquid outlet 301 on the side wall of the oil-gas separation cylinder 310, because the specific gravity of gas is smaller than that of the oil, gas (oil-gas mixture) containing a small amount of oil is gathered near the central axis of the oil-gas separation cylinder 310, and under the pressure of the oil gas mixture enters the atmospheric, thereby realizing the oil-gas separation of oil. This gear pump 1 utilizes fluid spiral flow characteristic, realizes oil-gas separation to liquid outlet 301 and gas outlet 302 set up respectively on lateral wall and central axis, guarantee the oil-gas separation effect.

According to the gear pump 1 for the fuel dispenser of the embodiment of the application, the oil-gas separator 300 is vertically arranged, oil enters from the upper end of the oil-gas separator 300 and flows downwards in a spiral shape, gas is smaller in specific gravity than the oil and is gathered near the central axis of the oil-gas separation cylinder 310 due to smaller centrifugal force, gas with a small amount of oil enters the normal pressure cavity 106 through the gas outlet 302 on the central axis of the oil-gas separation cylinder 310, separated pure oil flows downwards along the side wall of the oil-gas separation cylinder 310 due to the influence of gravity and enters the oil outlet cavity 105 from the liquid outlet 301 on the side wall, so that oil-gas separation is realized in the oil-gas separator 300, and the oil-gas separation effect is better. This a gear pump 1 for fuel tanker aircraft, oil-gas separation ability is strong, and oil-gas separation is more thorough, and the fluid of pumping does not contain gas, keeps the measurement accuracy.

The structural features and the connection of the components of the gear pump 1 for a fuel dispenser according to the embodiment of the present application are described below with reference to the accompanying drawings.

As shown in fig. 1, the gear pump 1 for a fuel dispenser (hereinafter referred to as gear pump 1) includes a pump body 100, a pump core 200, an oil-gas separator 300, a relief valve 400, and an exhaust device 500, wherein the pump core 200, the oil-gas separator 300, the relief valve 400, and the exhaust device 500 are all disposed in the pump body 100.

As shown in fig. 1 and 2, the pump body 100 includes a pump body 120, a pump upper cover 130, and a pump bottom cover 140, wherein openings are formed at the upper end and the lower end of the pump body 120, respectively, and the pump upper cover 130 is connected to the upper end of the pump body 120 and covers the opening at the upper end; the pump bottom cover 140 is connected to the lower end of the pump body 120 and blocks the opening of the lower end. An oil inlet 101 is formed in the pump body 120, and the oil inlet 101 is used for being communicated with an oil source; an oil outlet 102 and an air outlet 103 are formed in the pump upper cover 130, the oil outlet 102 is used for being communicated with a fuel gun, and the air outlet 103 is used for being communicated with the atmosphere. An oil inlet cavity 104, an oil outlet cavity 105 and a normal pressure cavity 106 are arranged inside the pump body 120, the oil inlet cavity 104 is communicated with the oil inlet 101, the oil outlet cavity 105 is communicated with the oil outlet 102, and the normal pressure cavity 106 is communicated with the exhaust port 103. Oil can enter the oil inlet cavity 104 from the oil inlet 101, and flows through the oil-gas separator 300 to be separated under the action of the pump core 200, and the separated pure oil enters the oil outlet cavity 105 and is discharged from the oil outlet 102; the separated oil-gas mixture enters the atmospheric pressure cavity 106, and gas is exhausted from the exhaust port 103.

Meanwhile, in order to facilitate installation of other components, the side wall of the pump body 120 is also provided with side openings, for example, the side end of the pump body 120 is provided with a first side opening 107 for the pump core 200 to penetrate through and a second side opening 108 for the relief valve 400 to be installed.

As shown in fig. 1 and 3, the pump cartridge 200 is disposed in the first side opening 107 of the pump body 120, an oil inlet side of the pump cartridge 200 is communicated with the oil inlet chamber 104, and an oil outlet side of the pump cartridge 200 is used for communicating with the gas-oil separator 300. The pump core 200 of the gear pump 1 of the embodiment of the present application adopts a fixed-axis type internal gear train, as shown in fig. 4, the pump core 200 includes an internal gear 210, an external gear 220 and a cover body 230, the gear pump 1 realizes oil discharge and oil absorption by engagement and disengagement of the internal gear 210 and the external gear 220, and the half-moon-shaped inner and outer circular arcs of the cover body 230 separate the oil inlet side of the pump core 200 from the oil outlet side of the pump core 200, thereby preventing oil leakage. The pump core 200 is used for pumping oil in the oil inlet chamber 104 to the air-oil separator 300. The working principle of the pump core 200 refers to the working principle of the gear pump 1 in the prior art, and the working principle is not described in detail in this application.

The gas-oil separator 300 is provided in the pump body 120, and as shown in fig. 5 and 6, an inlet of the gas-oil separator 300 communicates with the oil outlet side of the pump cartridge 200, a liquid outlet 301 of the gas-oil separator 300 communicates with the oil outlet chamber 105, and a gas outlet 302 of the gas-oil separator 300 communicates with the atmospheric pressure chamber 106. After the oil liquid enters the oil-gas separator 300, oil-gas separation is carried out in the oil-gas separator 300, separated pure oil liquid enters the oil outlet cavity 105 through the liquid outlet 301, and a separated oil-gas mixture (most of which is gas and contains a small amount of oil liquid) enters the atmospheric pressure cavity 106 through the gas outlet 302.

As shown in fig. 5 and 7, the oil-gas separator 300 includes an oil-gas separation cylinder 310 and a cyclone end cover 330, the central axis of the oil-gas separation cylinder 310 is vertically disposed, the cyclone end cover 330 is connected to the upper end of the oil-gas separation cylinder 310, a spiral flow guide groove 331 is disposed on the cyclone end cover 330, an inlet end of the spiral flow guide groove 331 is communicated with an oil outlet side of the pump core 200, and an outlet end of the spiral flow guide groove 331 is communicated with the oil-gas separation cylinder 310. The inlet end of the spiral diversion trench 331 forms the inlet of the oil-gas separator 300, and the cyclone end cover 330 is used for guiding the oil liquid on the oil outlet side of the pump core 200 into the oil-gas separation cylinder 310 and enabling the oil liquid to flow downwards along the inner wall of the oil-gas separation cylinder 310 in a spiral shape; the liquid outlet 301 of the oil-gas separator 300 is arranged on the side wall of the oil-gas separation cylinder 310 and is communicated with the oil outlet cavity 105; the gas outlet 302 of the oil-gas separator 300 is positioned on the central axis of the oil-gas separation cylinder 310 and on the top wall of the cyclone end cover 330, and the gas outlet 302 is communicated with the atmospheric pressure cavity 106.

Specifically, as shown in fig. 7 and 8, the spiral flow guide groove 331 on the cyclone end cover 330 extends in a horizontal direction, an inlet end of the spiral flow guide groove 331 is opened on a side wall of the cyclone end cover 330, and an inlet end of the spiral flow guide groove 331 forms an inlet of the oil-gas separator 300; the spiral diversion trench 331 extends from the side wall of the hydrocyclone end cover 330 to the middle of the hydrocyclone end cover 330 in a spiral manner, a cylindrical diversion trench 332 is arranged in the middle of the hydrocyclone end cover 330, the lower end of the cylindrical diversion trench 332 penetrates through the hydrocyclone end cover 330, the outlet end of the spiral diversion trench 331 is communicated with the cylindrical diversion trench 332, and the outlet end of the spiral diversion trench 331 is communicated with the upper end opening of the oil-gas separation cylinder 310 through the cylindrical diversion trench 332. The inlet end of the spiral diversion trench 331 is arranged on the side wall of the cyclone end cover 330, and the outlet end is arranged in the middle of the cyclone end cover 330, so that the path of oil in the spiral diversion trench 331 is increased, and the flow rate of the oil entering the oil-gas separation cylinder 310 is increased conveniently.

As an alternative embodiment of the present application, the sectional area of the spiral diversion trench 331 is gradually reduced from the inlet end to the outlet end, and the change of the sectional area of the spiral diversion trench 331 gradually increases the speed of the oil from the oil outlet side of the pump core 200 into the oil-gas separation cylinder 310, so that the oil is convenient to form a high-speed spiral flow in the oil-gas separation cylinder 310, so as to improve the oil-gas separation capability of the oil. In other embodiments of the present disclosure, the cross-sectional areas of the spiral diversion grooves 331 may also be equal, and the spiral diversion grooves 331 in this manner do not increase the flow velocity of the oil when the oil is diverted.

According to some embodiments of the present application, as shown in fig. 7, in order to communicate the oil outlet side of the pump core 200 with the air-oil separator 300, a communication chamber 109 is further disposed in the pump body 120, the oil outlet side of the pump core 200 communicates with the inlet end of the spiral diversion groove 331 through the communication chamber 109, and oil pumped by the oil outlet side of the pump core 200 enters the spiral diversion groove 331 through the communication chamber 109. The communicating cavity 109 is convenient for realizing the diversion of oil and ensures the smooth flow of the oil. The cross-sectional area of the communication chamber 109 gradually decreases from the oil outlet side to the inlet end of the spiral guide groove 331. The gradual change structure of the sectional area of the communication cavity 109 is matched with the gradual change structure of the spiral diversion trench 331, so that the flow speed of oil from the oil outlet side of the pump core 200 to the oil-gas separation barrel 310 is improved.

After the high-speed oil enters the oil-gas separation cylinder 310, the oil-gas separation effect is improved. Specifically, due to the guiding effect of the spiral guiding groove 331, after oil liquid with a high flow rate enters the oil-gas separation cylinder 310, the oil liquid is spiral along the inner wall of the oil-gas separation cylinder 310, based on the vertical arrangement of the oil-gas separation cylinder 310, the oil liquid flows spirally at a high speed under the action of centrifugal force, gas (oil-gas mixture) containing a small amount of oil liquid is gathered near the central axis of the oil-gas separation cylinder 310 due to the specific gravity of the gas, based on the flowing characteristic of the gas and the pressure of the oil liquid, the oil-gas mixture moves upwards and is discharged into the normal pressure cavity 106 from the gas outlet 302 on the top wall of the hydrocyclone end cover 330, pure oil liquid (oil liquid without gas, which is the same throughout) flows downwards along the inner wall of the oil-gas separation cylinder 310 under the action of gravity, and enters the oil outlet cavity 105 from.

According to some embodiments of the application, the liquid outlet 301 of the oil-gas separator 300 is located at the lower end of the oil-gas separation cylinder 310, and the inlet of the oil-gas separator 300 is located on the cyclone end cover 330 at the upper end of the oil-gas separation cylinder 310, so that it is ensured that oil has a long flow path in the oil-gas separation cylinder 310, oil is sufficiently separated from gas in the oil-gas separation cylinder 310, and the oil-gas separation effect is improved. As an optional mode of the present application, the liquid outlet 301 is spiral, and since the oil liquid flows downward in the oil-gas separation cylinder 310, the separated pure oil liquid flows spirally along the inner wall of the oil-gas separation cylinder 310, and enters the oil outlet chamber 105 at the lower end of the oil-gas separation cylinder 310 through the spiral liquid outlet 301. The spiral liquid outlet 301 has a flow guiding function, so that smooth flow of pure oil liquid is ensured.

According to some embodiments of the present application, as shown in fig. 5, the oil-gas separation cylinder 310 includes a cylinder body 311 and a connection ring 312, the connection ring 312 is sleeved on the cylinder body 311 and is located at the upper end of the cylinder body 311, and the cyclone end cap 330 is detachably connected to the connection ring 312. The upper end surface of the connection ring 312 is flush with the upper end surface of the cylinder body 311, and the outer diameter of the connection ring 312 is larger than that of the cylinder body 311 so as to support the cyclone end cover 330, so that the oil-gas separation cylinder 310 and the cyclone end cover 330 have a larger contact area. The arrangement of the connecting ring 312 facilitates the assembly of the hydrocyclone end cover 330 with the cylinder 311, and improves the assembly and maintenance efficiency of the hydrocyclone end cover 330. The arrangement of the connection ring 312 also enables the size of the oil-gas separation cylinder 310 to be smaller than that of the cyclone end cover 330, which is not only convenient for the oil to be drained into the oil-gas separation cylinder 310 from the oil outlet side of the pump core 200, but also saves the installation space occupied by the oil-gas separation cylinder 310, and also enables the oil to form a high-speed spiral flow in the oil-gas separation cylinder 310 through the guidance of the longer spiral diversion trench 331, so that the oil and the gas are fully separated in the oil-gas separation cylinder 310.

As an alternative to the present application, the hydrocyclone end cap 330 is bolted to the connection ring 312 to facilitate removal of the hydrocyclone end cap 330; the connection between the connection ring 312 and the cylinder 311 can be a threaded connection, which is convenient for assembly and disassembly. In other embodiments of the present application, the hydrocyclone end cap 330 and the connection ring 312 can also be clamped, screwed, etc.; the connection ring 312 and the cylinder 311 may also be connected by interference fit. It should be noted that the hydrocyclone end cap 330 is in sealing engagement with the connection ring 312 and the cylinder 311, and the connection ring 312 is in sealing engagement with the cylinder 311.

Further, in order to ensure that the oil has a fast flow velocity in the oil-gas separation cylinder 310, as shown in fig. 5, the inner diameter of the cyclone end cover 330 (the cylindrical diversion trench 332) is larger than the inner diameter of the oil-gas separation cylinder 310, and when the oil enters the oil-gas separation cylinder 310 with a smaller inner diameter from the cylindrical diversion trench 332 with a larger inner diameter, the flow velocity of the oil is further increased, so that the oil can perform high-speed spiral flow in the oil-gas separation cylinder 310.

Because the gas outlet 302 is a fixed flow area, when the gas content in the oil is small, the oil-gas mixture of the oil and the gas in the oil-gas separator 300 can carry a large amount of oil into the atmospheric pressure cavity 106, thereby affecting the oil pumping efficiency of the gear pump 1. In order to improve the above-mentioned problem, the present application provides a gas exhaust 500 at the gas outlet 302 of the oil separator 300, the gas exhaust 500 functioning as a gas exhaust valve; as shown in fig. 5 and 9, an exhaust device 500 is provided at the gas outlet 302 of the oil separator 300, and the oil-gas mixture separated by the oil separator 300 passes through the exhaust device 500 and enters the atmospheric pressure chamber 106. As shown in fig. 10, the exhaust device 500 includes a valve cylinder 510, a valve core 520 and a spring 530, the valve cylinder 510 is vertically disposed, the lower end of the valve cylinder 510 is abutted with the gas outlet 302 of the oil-gas separator 300, and the upper side wall of the valve cylinder 510 is provided with a valve port 511; the spool 520 is disposed within the valve cylinder 510 and is movable up and down with respect to the valve cylinder 510. The inner wall of the valve cylinder 510 is formed with a first limit step 512, and the spring 530 is used for driving the valve element 520 to move downwards to abut against the first limit step 512. The valve element 520 can change the flow area of the valve port 511 (i.e., change the opening degree of the valve) when moving up and down with respect to the valve cylinder 510.

As shown in fig. 9, the valve port 511 is a strip port extending along the circumferential direction of the valve cylinder 510 to realize a large flow area in the circumferential direction of the valve cylinder 510. In other embodiments of the present application, the valve port 511 may also be a square or round port.

Further, two valve ports 511 are provided, the two valve ports 511 are rotationally symmetric along the center line of the valve cylinder 510, and a connection part 513 is formed between the two valve ports 511, so as to ensure the overall strength of the valve cylinder 510 and prevent the valve cylinder 510 from separating at the upper and lower ends of the valve ports 511. The width of the connecting portion 513 (the dimension along the circumferential direction of the valve cylinder 510) determines the opening length of the valve port 511, and the width of the connecting portion 513 may be selected as small as possible while ensuring the overall strength of the valve cylinder 510.

According to some embodiments of the present application, the valve element 520 is a cylindrical structure, the valve element 520 and the valve cylinder 510 are coaxially arranged, the lower end surface of the valve element 520 abuts against the first limit step 512, and the oil-gas mixture discharged from the gas outlet 302 of the gas-oil separator 300 flows to the valve port 511 through the inner cavity of the valve cylinder 510 and the inner cavity of the valve element 520, and flows into the atmospheric pressure chamber 106 from the valve port 511. A second limit step 521 is formed on an inner wall of the valve core 520, and one end of the spring 530 is inserted into the valve core 520 and abuts against the second limit step 521.

According to some embodiments of the present application, as shown in fig. 5, the upper end of the valve cylinder 510 abuts against the top inner wall of the pump body 100 (i.e., the pump upper cover 130), the upper end opening of the valve cylinder 510 is blocked by the pump upper cover 130, and a sealing ring is disposed between the upper end of the valve cylinder 510 and the pump upper cover 130, which is used to ensure the connection sealing property between the valve cylinder 510 and the pump body 100; one end of the spring 530 abuts against the second limit step 521 of the valve element 520, and the other end of the spring 530 abuts against the pump upper cover 130. During installation, the valve core 520 and the spring 530 are placed in the valve cylinder 510, the upper end of the valve body is covered by the pump upper cover 130, and the upper end of the valve cylinder 510 is positioned and blocked by the spring 530 through the pump upper cover 130. In other embodiments of the present application, a baffle may be further disposed at an upper end of the valve cylinder 510, the baffle is detachably connected to the valve cylinder 510, one end of the spring 530, which is far away from the valve core 520, abuts against the baffle, the limit of the spring 530 is realized by the baffle, and the valve core 520 is also convenient to mount.

The action process of the valve core 520 is as follows: when the valve core 520 moves up and down relative to the valve cylinder 510, the distance between the upper end surface of the valve core 520 and the upper plane of the valve port 511 changes, when no gas or little gas is contained in the oil liquid in the oil-gas separator 300, the valve core 520 overcomes the elastic force of the spring 530 to move upwards under the action of the oil liquid pressure, the valve core 520 gradually shields the valve port 511, finally, the upper end surface of the valve core 520 moves to the limit position, at the moment, an exhaust passage (the valve opening is minimum, as shown in fig. 5) with a gap of 0.1-1mm is kept between the upper end surface of the valve core 520 and the upper plane of the valve port 511, and a small amount of oil-gas mixture generated in the oil-gas separation process; when the gas content in the oil liquid in the oil-gas separator 300 increases, the oil-liquid pressure in the oil-gas separator 300 decreases, so that the rising height of the valve core 520 decreases, the gas content in the oil liquid continues to increase, the oil-liquid pressure in the oil-gas separation cylinder 310 gradually decreases, when the oil-liquid pressure in the oil-gas separation cylinder 310 cannot overcome the elastic force of the spring 530, the valve core 520 does not rise, at this time, the upper end surface of the valve core 520 is flush with the lower plane of the valve port 511 (the valve opening is the largest, as shown in fig. 11), and the exhaust passage (the flow area of the valve port 511) reaches the largest, so that more oil-gas mixture generated in the oil-gas separation process is.

According to some embodiments of the present application, a positioning part for positioning and assembling the air-oil separator 300 and the exhaust device 500 is formed on an inner wall of the pump body 120. As shown in fig. 5, the positioning component includes a positioning mounting plate 111 and a limiting mounting part 112, the limiting mounting part 112 is located below the positioning mounting plate 111, the limiting mounting part 112 is a cylindrical structure, and the limiting mounting part 112 and the positioning mounting plate 111 enclose an accommodating space for accommodating the oil-gas separator 300; the communication chamber 109 is provided in the stopper mounting portion 112, and the oil liquid delivered from the oil outlet side of the pump cartridge 200 enters the oil separator 300 through the communication chamber 109 in the stopper mounting portion 112. The oil-gas separator 300 is located at the lower side of the positioning mounting plate 111 and covered by the limit mounting part 112, and the hydrocyclone end cover 330 is connected with the positioning mounting plate 111 through bolts (in other embodiments of the present application, clamping connection and the like can also be adopted); the exhaust device 500 is located on the upper side of the positioning mounting plate 111, a through hole is formed in the positioning mounting plate 111, a limiting flange 113 arranged around the through hole is formed on the upper surface of the positioning mounting plate 111, the gas outlet 302 of the oil-gas separator 300 is aligned with the through hole, the lower end of the valve cylinder 510 is clamped on the limiting flange 113, a sealing ring is arranged between the valve cylinder 510 and the limiting flange 113, and the connection sealing performance of the valve cylinder 510 and the limiting flange 113 is guaranteed.

Assembly of the oil separator 300 and the exhaust device 500 with the pump body 100: firstly, the oil-gas separator 300 extends into the limiting installation part 112 from the lower end opening of the pump body 120, the hydrocyclone end cover 330 abuts against the lower surface of the positioning installation plate 111, the hydrocyclone end cover 330 is connected with the positioning installation plate 111 through a bolt, then the pump bottom cover 140 is connected with the pump body 120 through a bolt, and the oil-gas separator 300 is blocked in the pump body 120; the lower end of the valve cylinder 510 of the exhaust device 500 is inserted into the limit flange 113 and is in sealing fit with the limit flange 113, the valve cylinder 510 is coaxially arranged with the through hole of the positioning mounting plate 111, the upper pump cover 130 is covered on the upper end opening of the pump body 120, the upper pump cover 130 is connected with the pump body 120 through bolts, and the assembly of the oil-gas separator 300 and the exhaust valve with the pump body 100 is completed.

According to some embodiments of the present application, as shown in fig. 1, the overflow valve 400 is disposed in the second side opening 108 of the pump body 120, and the oil outlet chamber 105 is communicated with the oil inlet chamber 104 through the overflow valve 400, that is, the pure oil separated by the air-oil separator 300 can flow back into the oil inlet chamber 104 through the overflow valve 400 after entering the oil outlet chamber 105. The opening pressure of the overflow valve 400 is adjustable, and the highest pressure of the oil pumping system of the gear pump 1 is limited by adjusting the opening pressure of the overflow valve 400, so that the pumped oil partially or completely overflows due to the change of load (opening degree of a fuel gun), and the stability of the oil pumping of the gear pump 1 is ensured.

As shown in fig. 12 and 13, a first diversion port 114 for communicating with the oil inlet chamber 104 is formed on the bottom wall of the normal pressure chamber 106, a float valve 600 is disposed in the pump body 120, and the first diversion port 114 is opened or closed by the float valve 600 to realize the communication or disconnection between the normal pressure chamber 106 and the oil inlet chamber 104. In this application, first water conservancy diversion mouth 114 is along vertical extension, and float valve 600 level sets up, is convenient for realize the quick backward flow of fluid. As shown in fig. 13, the float valve 600 includes a sealing plate 610, a float 620, an adjusting screw 630, a mounting seat 640, a guide rod 650, and an adjusting spring 660, wherein one end of the sealing plate 610 is sleeved on the adjusting screw 630, and the float 620 is connected with the other end of the sealing plate 610 through a connecting lug 621; one end of the adjusting screw 630 is connected with the mounting seat 640, and the other end of the adjusting screw 630 is provided with a limiting part 631; the adjusting screw 630 is sleeved with the adjusting spring 660, and the adjusting spring 660 is elastically supported between the limiting portion 631 and the sealing plate 610 to drive the sealing plate 610 to move towards the mounting seat 640. The mounting base 640 is provided with a backflow hole 641 corresponding to the first diversion port 114, one end of the guide rod 650 is connected to the mounting base 640, the other end of the guide rod 650 penetrates through the sealing sheet 610, and the backflow hole 641 is located between the guide rod 650 and the adjusting screw 630. Guide 650 cooperates with adjustment screw 630 to provide flexibility in moving sealing plate 610 up and down relative to mounting block 640, preventing sealing plate 610 from rotating relative to adjustment screw 630. The head of the adjusting screw 630 forms a limiting part 631, a gasket 632 is sleeved on the adjusting screw 630, and the gasket 632 is located between the adjusting spring 660 and the limiting part 631. The adjusting screw 630 is threadedly coupled to the mounting seat 640, and when the adjusting screw 630 is rotated, the protruding length of the adjusting screw 630 can be adjusted, thereby changing the compression amount of the adjusting spring 660 and adjusting the restoring capability of the float valve 600.

In order to facilitate the communication between the normal pressure chamber 106 and the oil inlet chamber 104, a second diversion port (not shown) is formed at the bottom of the oil inlet chamber 104, a diversion channel 141 is formed on the pump bottom cover 140, and the normal pressure chamber 106 is communicated with the oil inlet chamber 104 through the diversion channel 141 on the pump bottom cover 140.

The operating principle of the float valve 600 is: when the liquid level of the oil in the atmospheric pressure chamber 106 rises, the float 620 overcomes the elastic force of the adjusting spring 660 by using the buoyancy of the float 620, and lifts the sealing plate 610, so that the sealing plate 610 is separated from the mounting seat 640, and the return hole 641 is opened, so that the oil in the atmospheric pressure chamber 106 can flow into the oil inlet chamber 104 through the return hole 641 and the first diversion port 114. The sealing plate 610 forms a plane seal with the mounting seat 640, when the sealing plate 610 inclines relative to the mounting seat 640 (when the sealing plate 610 is partially separated from the sealing seat under the driving of the float 620), the return hole 641 is opened, and oil in the normal pressure cavity 106 can be discharged out of the normal pressure cavity 106 through the return hole 641; when the sealing plate 610 is completely separated from the mounting seat 640, the oil inlet amount around the backflow hole 641 of the mounting seat 640 reaches the maximum, and quick oil return is realized (the oil enters the oil inlet chamber 104 through the backflow hole 641 and is called oil return). When the liquid level in the normal pressure chamber 106 drops, the float 620 drops, the sealing sheet 610 is attached to the sealing seat to form a seal by adjusting the elastic force of the spring 660, and the backflow hole 641 is closed.

The gear pump 1 for the fuel dispenser according to the embodiment of the present application operates on the principle that:

after the pump core 200 works, the pump core 200 sucks oil from the oil inlet cavity 104, the oil is conveyed to the hydrocyclone end cover 330 through the communicating cavity 109, the oil enters the oil-gas separation cylinder 310 under the guidance of the spiral diversion trench 331 and flows spirally downwards along the inner wall of the oil-gas separation cylinder 310 at a high speed, the oil is subjected to oil-gas separation under the action of centrifugal force, and separated pure oil enters the oil outlet cavity 105 through the liquid outlet 301 at the lower end of the oil-gas separation cylinder 310; the separated oil-gas mixture (mostly gas, containing a small amount of oil) enters the atmospheric chamber 106 through the gas outlet 302 on the central axis of the oil-gas separation cylinder 310 and the exhaust device 500. After the oil-gas mixture enters the normal pressure cavity 106, secondary separation is carried out, gas is discharged from the exhaust port 103 of the pump upper cover 130, oil is accumulated in the normal pressure cavity 106, after the oil is accumulated to a certain degree, the float valve 600 is opened, and the oil flows into the oil inlet cavity 104 through the normal pressure cavity 106 to be conveyed secondarily. During oil transportation, when the oil load changes, oil partially or completely overflows through the overflow valve 400 in the oil outlet chamber 105 and flows back into the oil inlet chamber 104.

According to gear pump 1 for fuel tanker aircraft of this application embodiment, oil-gas separation ability is strong, and oil-gas separation is more thorough, guarantees that the fluid of pumping does not contain gas, keeps the measurement accuracy.

It should be noted that the features of the embodiments in the present application may be combined with each other without conflict.

The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims (10)

1. A gear pump for a fuel dispenser, the gear pump comprising:

the oil pump comprises a pump body, wherein an oil inlet, an oil outlet and an exhaust port are formed in the pump body, and an oil inlet cavity communicated with the oil inlet, an oil outlet cavity communicated with the oil outlet and a normal pressure cavity communicated with the exhaust port are formed in the pump body;

the pump core is arranged in the pump body, and the oil inlet side of the pump core is communicated with the oil inlet cavity;

the oil-gas separator is arranged in the pump body and comprises an oil-gas separation cylinder and a liquid rotating end cover, the central axis of the oil-gas separation cylinder is vertically arranged, the liquid rotating end cover is connected to the upper end of the oil-gas separation cylinder, the liquid rotating end cover is used for guiding oil on the oil outlet side of the pump core to the inside of the oil-gas separation cylinder and enabling the oil to flow downwards spirally along the inner wall of the oil-gas separation cylinder, a liquid outlet of the oil-gas separator is arranged on the side wall of the oil-gas separation cylinder and communicated with the oil outlet cavity, and a gas outlet of the oil-gas separator is positioned on the central axis and communicated with the normal pressure cavity.

2. The gear pump for a fuel dispenser of claim 1, wherein said gas outlet is disposed on said spinner end cap.

3. The gear pump for a fuel dispenser as set forth in claim 2, wherein said hydrocyclone end cap is provided with a spiral flow guide groove, an inlet end of said spiral flow guide groove communicating with an oil outlet side of said pump core, and an outlet end of said spiral flow guide groove communicating with an inner cavity of said oil-gas separation cylinder.

4. The gear pump for a fuel dispenser of claim 3, wherein said inlet end of said helical flow guide channel is disposed on a side wall of said hydrocyclone end cap and said gas outlet is disposed on a top wall of said hydrocyclone end cap.

5. The gear pump for a fuel dispenser of claim 3, wherein said helical flow guide slots have a cross-sectional area that decreases from said inlet end to said outlet end.

6. The gear pump for a fuel dispenser as set forth in claim 3, wherein a communicating chamber is further provided in said pump body, the oil outlet side of said pump core communicates with the inlet end of said spiral guide groove through said communicating chamber, and the sectional area of said communicating chamber is gradually reduced from said oil outlet side to said inlet end.

7. The gear pump for a fuel dispenser of claim 1, wherein said liquid outlet is located at a lower end of said air/fuel separator cylinder.

8. The gear pump for a fuel dispenser of claim 1, wherein said vapor-liquid separator cartridge comprises a cartridge body and a coupling ring, said coupling ring being disposed on said cartridge body at an upper end of said cartridge body, said hydrocyclone end cap being removably coupled to said coupling ring.

9. The gear pump for a fuel dispenser of claim 1, further comprising an overflow valve, said oil outlet chamber being in communication with said oil inlet chamber through said overflow valve, said overflow valve having an adjustable cracking pressure.

10. The gear pump for a fuel dispenser as set forth in claim 1, wherein a pilot port communicating with said fuel inlet chamber is provided on a wall of said atmospheric chamber, said pilot port being opened or closed by a float valve.

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