CN212203332U

CN212203332U - Float valve and gear pump for fuel dispenser

Info

Publication number: CN212203332U
Application number: CN202020548909.1U
Authority: CN
Inventors: 马辉; 和家璇; 李哲; 张磊; 胡天雄; 王志强
Original assignee: Censtar Science & Technology Corp ltd
Current assignee: Censtar Science & Technology Corp ltd
Priority date: 2020-04-14
Filing date: 2020-04-14
Publication date: 2020-12-22
Anticipated expiration: 2030-04-14

Abstract

The application relates to a float valve and a gear pump for a fuel oiling machine, and belongs to the technical field of float valves. The float valve includes float, gasket, seal receptacle, spring and first guide arm, and the one end of gasket is worn to locate by first guide arm, and the float is connected in the other end of gasket, and the one end and the seal receptacle of first guide arm are connected, and the other end of first guide arm is equipped with backstop portion, and the spring housing is established on first guide arm, and spring elastic support has seted up the backward flow hole between gasket and backstop portion on the seal receptacle, and the gasket can seal or open the backward flow hole. According to the float valve, the sealing sheet and the sealing seat form plane sealing, the float valve is applied to a gear pump, quick backflow of oil can be achieved, and backflow efficiency of the oil is improved.

Description

Float valve and gear pump for fuel dispenser

Technical Field

The application relates to the technical field of float valves, in particular to a float valve and a gear pump for a fuel dispenser.

Background

In the prior art, a float valve is arranged in a normal pressure cavity of a gear pump, when oil in the normal pressure cavity is accumulated to a certain degree, the float floats upwards under the action of buoyancy, the float valve is opened, and the oil flows back to an oil inlet cavity of a pump body.

The existing float valve has slow oil return speed due to structural limitation, and the oil return efficiency is influenced.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a float valve, the gasket forms the face seal with the seal receptacle, is applied to the gear pump, can realize the quick backward flow of fluid, has improved the backward flow efficiency of fluid.

Another object of the present application is to provide a gear pump for a fuel dispenser that can achieve a rapid backflow of oil in a normal pressure chamber.

According to the float valve of this application first aspect embodiment, including float, gasket, seal receptacle, spring and first guide arm, the one end of gasket is worn to locate by first guide arm, and the float is connected in the other end of gasket, and the one end and the seal receptacle of first guide arm are connected, and the other end of first guide arm is equipped with backstop portion, and the spring housing is established on first guide arm, and spring elastic support has seted up the backward flow hole between gasket and backstop portion on the seal receptacle, and the gasket can seal or open the backward flow hole.

According to the float valve disclosed by the embodiment of the application, plane sealing is formed through the matching of the sealing sheet and the sealing seat; when being applied to the ordinary pressure chamber of gear pump, because first guide arm and float are located the both ends of gasket and the spring's of spring respectively effect, when the float floated under the effect of fluid buoyancy, along with the lifting of float (when the gasket did not separate completely with the seal receptacle), form the inclination between gasket and the seal receptacle, fluid can flow into the clearance between gasket and the seal receptacle fast, the backward flow hole is opened, along with the further rising of liquid level, the elasticity of spring is overcome to the buoyancy of float, the gasket thoroughly breaks away from with the seal receptacle, the peripheral oil feed volume of backward flow hole reaches the biggest, can realize the quick backward flow of fluid. The float valve has good sealing effect and high oil liquid backflow speed, and improves the oil liquid backflow efficiency.

In addition, the float valve according to the embodiment of the present application has the following additional technical features:

according to some embodiments of the application, the float valve further comprises a second guide rod, the second guide rod is arranged through the sealing sheet, and one end of the second guide rod is connected with the sealing seat.

In the above embodiment, the second guide rod is matched with the first guide rod to limit the sealing sheet and prevent the sealing sheet from rotating around the first guide rod; the second guide rod also plays a role in guiding, so that the sealing plate can float flexibly up and down.

In some embodiments of the present application, the second guide is located between the first guide and the float.

In the above embodiment, the second guide rod is arranged at a position for supporting the sealing sheet, so that the sealing sheet can be flexibly moved.

In some embodiments of the present application, the return orifice is located between the first guide bar and the second guide bar.

In the above embodiment, the position of the backflow hole is convenient for ensuring the sealing effect of the sealing sheet and the sealing seat.

According to some embodiments of the application, the first guide bar is an adjusting screw.

In the above embodiment, the adjusting screw can rotate relative to the seal seat to change the compression amount of the spring and adjust the floating height of the float, and the adjustment is flexible.

According to some embodiments of the application, the float is arranged in suspension relative to the seal seat.

In the above embodiment, the float is suspended from the seal holder, and when the float descends following the liquid level, the sealing sheet can first contact with the seal holder to form a seal, thereby preventing the float from interfering with the seal holder.

In some embodiments of the present application, the bottom surface of the float is lower than the upper surface of the seal seat.

In the above embodiment, the bottom surface of the float is lower than the upper surface of the seal seat, so that the float can float when the liquid level is lower than the seal seat, and the oil can be discharged quickly.

In some embodiments of the present application, the float includes a float body and a coupling lug coupled to the float body, the coupling lug protruding from the float body, the coupling lug coupled to the sealing plate.

In the above embodiment, the engaging lug protrudes from the float body, so that the connection between the float body and the sealing sheet is facilitated.

The gear pump for the fuel dispenser according to the embodiment of the second aspect of the application comprises a pump body, a pump core, an oil-gas separator and a float valve according to the embodiment of the first aspect of the application;

an oil inlet, an oil outlet and an exhaust port are arranged on 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 arranged 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, an inlet of the oil-gas separator is communicated with the oil outlet side of the pump core, a liquid outlet of the oil-gas separator is communicated with the oil outlet cavity, and a gas outlet of the oil-gas separator is communicated with the normal pressure cavity;

the bottom of the atmospheric pressure cavity is provided with a first flow guide port communicated with the oil inlet cavity, and the first flow guide port is opened or closed through a float valve.

According to the gear pump for the fuel dispenser, the first flow guide opening is connected with the normal pressure cavity and the oil inlet cavity, when the float valve is opened, oil in the normal pressure cavity can be discharged into the oil inlet cavity through the first flow guide opening, and backflow of the oil is achieved; the float valve has the function of rapid backflow, and by adopting the float valve, the backflow efficiency of oil is improved.

According to some embodiments of the application, the bottom of the oil inlet cavity is provided with a second diversion port, the gear pump further comprises an end cover, the end cover is installed at the bottom of the pump body, a diversion channel is arranged on the end cover, and the first diversion port and the second diversion port are communicated through the diversion channel.

In the above embodiment, the second diversion port and the end cover are arranged to cooperate with the first diversion port, so that the communication between the normal pressure cavity and the oil inlet cavity is realized, and the oil can conveniently flow back.

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 a perspective view of a float valve provided in an embodiment of the first aspect of the present application;

FIG. 2 is a top view of a float valve provided in an embodiment of the first aspect of the present application;

3 FIG. 33 3 is 3 a 3 cross 3- 3 sectional 3 view 3 taken 3 along 3 line 3 A 3- 3 A 3 of 3 FIG. 32 3; 3

FIG. 4 is a partial enlarged view of FIG. 3 (showing the structure of the float valve);

figure 5 is a schematic illustration (in cross-section for ease of understanding) of the installation of a float valve of a gear pump for a fuel dispenser as provided in an embodiment of the second aspect of the present application.

Icon: 100-a float valve; 10-a float; 11-a float body; 12-connecting lugs; 13-connecting a locking piece; 20-sealing slice; 22-elongated holes; 30-a sealing seat; 31-a reflow hole; 32-a first mounting hole; 33-a second mounting hole; 40-a spring; 41-a gasket; 50-a first guide bar; 51-a stop; 60-a second guide bar; 200-gear pump; 70-a pump body; 71-a constant pressure cavity; 72-a first diversion port; 80-end cap; 81-flow guide channel.

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.

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 float valve 100 according to an embodiment of the first aspect of the present application is described below with reference to the drawings.

As shown in fig. 1 to 3, a float valve 100 according to an embodiment of the present application includes: float 10, sealing plate 20, sealing seat 30, spring 40 and first guide rod 50.

Specifically, as shown in fig. 1, the float valve 100 is used in a chamber requiring a valve (for example, a normal pressure chamber of a gear pump, or a chamber requiring opening and closing of a valve such as another water tank), and the float 10 floats on the surface of liquid, and the valve is opened by the buoyancy of the float 10. One end of the sealing sheet 20 is connected with the float 10, the first guide rod 50 penetrates through the other end of the sealing sheet 20 (the end of the sealing sheet 20 opposite to the float 10), and the float 10 can drive the sealing sheet 20 to move up and down relative to the first guide rod 50. The first guide rod 50 is arranged perpendicular to the sealing seat 30, one end of the first guide rod 50 is connected with the sealing seat 30, and the other end of the first guide rod 50 is provided with a stopping part 51; the spring 40 is sleeved on the first guide rod 50, the spring 40 is elastically supported between the sealing sheet 20 and the stopping portion 51, the stopping portion 51 limits the movement of the spring 40, and the spring 40 drives the sealing sheet 20 to move towards the sealing seat 30 by virtue of elasticity. The sealing seat 30 is provided with a backflow hole 31, when the sealing piece 20 is attached to the sealing seat 30, the sealing piece 20 and the sealing seat 30 form plane sealing, and the backflow hole 31 is sealed by the sealing piece 20; when the sealing sheet 20 is separated from the sealing seat 30 by the buoyancy of the float 10, the return hole 31 is opened and the liquid can be discharged through the return hole 31.

According to the float valve 100 of the embodiment of the application, plane sealing is formed through the matching of the sealing sheet 20 and the sealing seat 30, the sealing effect of the sealing sheet 20 and the sealing seat 30 is good, and the backflow hole 31 can be opened or closed quickly; when being applied to the ordinary pressure chamber of gear pump, because first guide arm 50 and float 10 are located the relative both ends of gasket 20 respectively, including the spring action of spring 40, when float 10 floated under the effect of fluid buoyancy, along with the lifting of float 10 (when gasket 20 did not separate with seal receptacle 30 completely), form the inclination between gasket 20 and the seal receptacle 30, fluid can flow into the clearance between gasket 20 and the seal receptacle 30 fast, the backward flow hole 31 is opened, along with the further rising of liquid level, spring 40's elasticity is overcome to float 10's buoyancy, gasket 20 thoroughly breaks away from with seal receptacle 30, the peripheral oil feed of backward flow hole 31 reaches the biggest, can realize the quick backward flow of fluid. The float valve 100 is good in sealing effect, high in oil liquid backflow speed and capable of improving oil liquid backflow efficiency.

Structural features and connection of the components of the float valve 100 according to the embodiment of the present application will be described below with reference to the accompanying drawings.

In order to ensure the sealing performance of the sealing sheet 20 and the sealing seat 30, the float valve 100 of the present application is horizontally arranged, that is, the sealing seat 30 and the sealing sheet 20 are horizontally arranged.

As shown in fig. 1 and 2, the sealing seat 30 is used to be installed at a return port at the bottom of a chamber (an example of the present application is described by taking an atmospheric pressure chamber of a gear pump as an example, and in other embodiments of the present application, the chamber may also be a water storage chamber of a water tank), and the sealing seat 30 is used to cover the return port to facilitate the installation of the float valve 100. The sealing seat 30 plays a role in positioning and supporting, a backflow hole 31 is formed in the sealing seat 30, and the backflow hole 31 corresponds to the backflow port. The sealing seat 30 is provided with a positioning hole for positioning connection with the bottom wall of the chamber. The sealing seat 30 is provided with a first mounting hole 32 for connecting with the first guide rod 50, and the first mounting hole 32 is located at one end of the sealing seat 30.

As shown in fig. 1 and 3, the first guide rod 50 is perpendicular to the sealing seat 30, one end of the first guide rod 50 is inserted into the first mounting hole 32 and connected to the sealing seat 30, and the other end of the first guide rod 50 is provided with a stopper 51 (as shown in fig. 4) to prevent a component sleeved on the first guide rod 50 from separating from the first guide rod 50.

Optionally, in order to facilitate adjusting the length of the first guide rod 50, the first installation hole 32 is a threaded hole, the first guide rod 50 is an adjusting screw (i.e., a threaded rod), the first guide rod 50 is in threaded connection with the sealing seat 30, and by rotating the first guide rod 50, the extending length of the first guide rod 50 relative to the sealing seat 30 can be adjusted to change the distance between the stopping portion 51 of the first guide rod 50 and the sealing seat 30; the threaded connection allows for flexible adjustment of first guide rod 50 relative to seal housing 30.

In other embodiments of the present application, in order to adjust the distance between the stopper 51 and the sealing seat 30, the first guide rod 50 may also be a telescopic rod, and the telescopic rod may adjust the length to meet the adjustment of the distance between the stopper 51 and the sealing seat 30.

The sealing plate 20 is adapted to cooperate with the sealing seat 30 to close or open the backflow hole 31, and thus, the sealing plate 20 has a large contact area with the sealing seat 30 when the sealing plate 20 is attached to the sealing seat 30. As shown in fig. 3 and 4, the sealing plate 20 has opposite ends, one end of the sealing plate 20 is fitted over the first guide bar 50, and the other end of the sealing plate 20 is connected to the float 10. When the float 10 floats under the buoyancy of the oil, the float 10 can drive the sealing sheet 20 to slide relative to the first guide rod 50, so that the sealing sheet 20 is gradually separated from the sealing seat 30.

As shown in fig. 1 and 4, the float 10 is suspended relative to the seal housing 30, and ensures that the float 10 does not interfere with the seal housing 30 when the seal plate 20 is in contact with the seal housing 30.

According to some embodiments of the present application, the bottom surface of the float 10 is lower than the upper surface of the seal holder 30. When the floater 10 descends along with the liquid level and the bottom of the floater 10 is flush with the sealing seat 30, the sealing sheet 20 is not in contact with the sealing seat 30, the sealing sheet 20 is in contact with the sealing seat 30 to form a plane seal along with the continuous descending of the liquid level, and at the moment, the bottom surface of the floater 10 is lower than the upper surface of the sealing seat 30. When the fluid in the cavity increases, because the bottom surface of float 10 is close to the diapire of cavity for the upper surface of seal receptacle 30, behind fluid contact float 10, with the lift of float 10, along with the lift of float 10, gasket 20 separates gradually with seal receptacle 30, and fluid gets into backward flow hole 31 via the clearance between gasket 20 and the seal receptacle 30, can realize the quick backward flow of fluid.

As shown in fig. 2 and 4, the float 10 includes a float body 11 and a connection lug 12, the float body 11 is located outside the seal seat 30 (along a projection plane perpendicular to the seal seat 30 on a plane where the seal seat 30 is located, the projection of the float body 11 does not overlap with the seal seat 30), the connection lug 12 protrudes from the float body 11 and is connected to the float body 11, and one end of the connection lug 12, which is far away from the float body 11, is connected to the sealing sheet 20. The connecting lug 12 has a certain distance with respect to the bottom of the float body 11, so that the bottom surface of the float body 11 is lower than the upper surface of the sealing seat 30 when the sealing sheet 20 is attached to the sealing seat 30 after the sealing sheet 20 is assembled on the connecting lug 12.

Specifically, a first connection hole (not shown) is formed in the connection lug 12, a second connection hole (not shown) corresponding to the first connection hole is formed in the sealing piece 20, and the connection lug 12 and the sealing piece 20 are locked by a connection locking member 13 penetrating through the first connection hole and the second connection hole. Optionally, first connecting hole is the through-hole, and the second connecting hole is the screw hole, connects retaining member 13 to be the screw, is convenient for realize engaging lug 12 and gasket 20's assembly and dismantlement, has improved maintenance efficiency.

According to some embodiments of the present application, as shown in fig. 1 and 4, the spring 40 is sleeved on the first guide rod 50, the first guide rod 50 is sleeved with the spacer 41, the spring 40 is elastically supported between the spacer 41 (i.e., the stopper 51) and the sealing plate 20, and the elastic force of the spring 40 can drive the sealing plate 20 to move toward the sealing seat 30. When the oil in the chamber increases, the buoyancy of the float 10 drives the sealing sheet 20 to move upwards relative to the first guide rod 50 against the elastic force of the spring 40, at the initial stage of lifting the float 10, due to the elastic force of the spring 40, one end, connected with the float 10, of the sealing sheet 20 is lifted relative to the sealing seat 30, a gap is formed between the sealing sheet 20 and the sealing seat 30, the backflow hole 31 is gradually opened, and the oil can enter the backflow hole 31 through the gap, so that the oil can flow back quickly.

Further, the float valve 100 further includes a second guide rod 60, the second guide rod 60 is disposed through the sealing sheet 20, one end of the second guide rod 60 is connected to the sealing seat 30, and the sealing sheet 20 can slide in the vertical direction with respect to the second guide rod 60. The second guide bar 60 cooperates with the first guide bar 50 to prevent rotation of the sealing plate 20 relative to the first guide bar 50. Specifically, the seal seat 30 is provided with a second mounting hole 33, the backflow hole 31 is located between the first mounting hole 32 and the second mounting hole 33, and one end of the second guide rod 60 is inserted into the second mounting hole 33. The second mounting hole 33 is disposed at a position that facilitates ensuring the sealing effect of the sealing piece 20 and the sealing seat 30.

In some embodiments of the present application, as shown in fig. 2, the sealing piece 20 is formed with a long hole 22 for the second guide rod 60 to pass through, and the second guide rod 60 is in clearance fit with the sealing piece 20. When the sealing sheet 20 is lifted along with the floater 10, one end of the sealing sheet 20 connected with the floater 10 is lifted relative to the sealing seat 30 first due to the elastic force of the spring 40 penetrating through the first guide rod 50, the sealing sheet 20 is inclined, and the sealing sheet 20 is not interfered with the second guide rod 60 due to the arrangement of the long hole 22, so that the sealing sheet 20 is convenient to float relative to the second guide rod 60.

The operating principle of the float valve 100 according to the embodiment of the present application is:

the sealing seat 30 and the sealing sheet 20 are horizontally arranged, and the sealing seat 30 and the sealing sheet 20 form plane sealing; when the floater 10 floats along with the rise of the liquid level, the floater 10 drives the sealing sheet 20 to lift, the sealing sheet 20 is gradually separated from the sealing seat 30, the sealing sheet 20 and the sealing seat 30 form a certain angle, at the moment, the backflow hole 31 is opened, and liquid quickly enters the gap and is discharged from the backflow hole 31. When the liquid level further rises, the sealing sheet 20 is thoroughly separated from the sealing seat 30 due to the buoyancy action of the floater 10 overcoming the elastic force of the spring 40, and at the moment, the oil inlet flux at the periphery of the return hole 31 reaches the maximum, so that the quick oil return action is realized. When the liquid level drops, the float 10 drops, the seal piece 20 is attached to the seal seat 30 by the elastic force of the spring 40 to form a seal, and the return hole 31 is closed.

According to the float valve 100 of the embodiment of the application, the plane sealing of the sealing seat 30 and the sealing sheet 20 is good in sealing effect, meanwhile, the oil liquid is fast in backflow speed, and the backflow efficiency of the oil liquid is improved.

A gear pump 200 for a fuel dispenser according to an embodiment of the second aspect of the present application is described below.

As shown in fig. 5, the gear pump 200 includes a pump body 70, a pump core (not shown), an air-oil separator (not shown), and the float valve 100 according to the embodiment of the first aspect of the present application.

An oil inlet (not shown in the figure), an oil outlet (not shown in the figure) and an air outlet (not shown in the figure) are arranged on the pump body 70, and an oil inlet cavity (not shown in the figure) communicated with the oil inlet, an oil outlet cavity (not shown in the figure) communicated with the oil outlet and a normal pressure cavity 71 communicated with the air outlet are arranged in the pump body 70. The pump core is arranged in the pump body 70, 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 70, an inlet of the oil-gas separator is communicated with the oil outlet side of the pump core, a liquid outlet of the oil-gas separator is communicated with the oil outlet cavity, and a gas outlet of the oil-gas separator is communicated with the normal pressure cavity 71. The bottom of the atmospheric chamber 71 is provided with a first pilot port 72 communicating with the oil inlet chamber, and the first pilot port 72 is opened or closed by a float valve 100.

It should be noted that the specific structure of the pump body 70 and the pump core of the gear pump 200 refers to the structure of the existing gear pump, and the detailed description is omitted here. The present application is directed to the assembly of the float valve 100 with the atmospheric chamber 71.

The float valve 100 is provided at the first pilot port 72 for opening or closing the first pilot port 72. The sealing seat 30 is installed on the inner bottom wall of the atmospheric pressure chamber 71, and the backflow hole 31 on the sealing seat 30 corresponds to the first diversion port 72. When the return hole 31 is opened, the first diversion port 72 is opened, and the oil in the normal pressure cavity 71 can flow out of the normal pressure cavity 71 through the return hole 31 and the first diversion port 72.

Further, the bottom of the oil inlet cavity is provided with a second diversion port (not shown in the figure), the gear pump 200 further comprises an end cover 80, the end cover 80 is installed at the bottom of the pump body 70, a diversion channel 81 is arranged on the end cover 80, and the first diversion port 72 is communicated with the second diversion port through the diversion channel 81. After the end cover 80 is assembled with the pump body 70, the diversion channel 81 of the end cover 80 becomes a bridge for communicating the first diversion port 72 with the second diversion port. When the oil in the normal pressure cavity 71 increases, the liquid level of the oil rises, the oil lifts the floater 10, the floater 10 drives the sealing sheet 20 to rise, the sealing sheet 20 is gradually separated from the sealing seat 30, the backflow hole 31 is opened, the first diversion port 72 is opened, and the oil enters the oil inlet cavity through the backflow hole 31, the first diversion port 72, the diversion channel 81 and the second diversion port, so that the oil is recycled.

According to the gear pump 200 for the fuel dispenser of the embodiment of the application, the opening or closing of the first diversion port 72 is realized through the float valve 100, so that the communication and disconnection between the normal pressure cavity 71 and the oil inlet cavity are realized, and the quick backflow of oil from the normal pressure cavity 71 to the oil inlet cavity is conveniently realized. The gear pump 200 has a compact structure, a small volume and high oil liquid backflow efficiency.

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

1. The utility model provides a float valve, its characterized in that, includes float, gasket, seal receptacle, spring and first guide arm, first guide arm is worn to locate the one end of gasket, the float connect in the other end of gasket, the one end of first guide arm with the seal receptacle is connected, the other end of first guide arm is equipped with backstop portion, the spring housing is established on the first guide arm, spring elastic support is in the gasket with between the backstop portion, the backward flow hole has been seted up on the seal receptacle, the gasket can seal or open the backward flow hole.

2. The float valve of claim 1 further comprising a second guide rod, said second guide rod being disposed through said sealing plate, one end of said second guide rod being connected to said sealing seat.

3. The float valve of claim 2 wherein said second guide is located between said first guide and said float.

4. The float valve of claim 3 wherein said return orifice is located between said first guide rod and said second guide rod.

5. The float valve of claim 1 wherein said first guide is an adjustment screw.

6. The float valve of claim 1 wherein said float is disposed in suspension relative to said seat.

7. The float valve of claim 6 wherein a bottom surface of said float is below an upper surface of said seal seat.

8. The float valve of claim 6 wherein said float includes a float body and a lug coupled to said float body, said lug projecting from said float body, said lug being coupled to said sealing plate.

9. Gear pump for a fuel dispenser, characterized in that it comprises a pump body, a pump cartridge, an air-oil separator and a float valve according to any one of claims 1 to 8;

and a first flow guide port communicated with the oil inlet cavity is arranged at the bottom of the normal pressure cavity, and the first flow guide port is opened or closed through the float valve.

10. The gear pump for a fuel dispenser of claim 9, wherein a second flow guide port is provided at a bottom of said oil inlet chamber, said gear pump further comprising an end cap, said end cap being mounted at a bottom of said pump body, said end cap being provided with a flow guide channel, said first flow guide port and said second flow guide port being communicated through said flow guide channel.