JPH1019150A - Check valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a check valve making pressure in a tank completely equal to the atmospheric pressure with a small number of part items, without the generation of dispersion between products and preventing leakage of object liquid such as fuel even when a fuel tank is placed in an inverted state. SOLUTION: This check valve is provided with a tank side cap 2 provided with a gas flow passage 5 as well as having a base protruded to place a sealing member 7, an atmosphere side cap 10 fitted into the tank side cap 2 and provided with a gap flow passage 13 opened inside so as to be communicated with the gas flow passage 5 of the tank side cap 2, and the sealing member 7 that can seal the gas flow passage 13 of the atmosphere side cap 10. The tank interior A on which the tank side cap 2 is mounted is normally communicated with the atmosphere side B through both gas flow passages 5, 13, and when equipment or a vehicle or the like mounted with a tank overturns to put the tank in an inverted state, the sealing ball 7 seals the gas flow passage 13 of the atmosphere side cap 10 to prevent leakage of fuel or the like in the tank.

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a check valve for a fuel tank and the like, and more particularly to a check valve for a snowmobile, a jet ski, an agricultural machine and the like. The present invention relates to a check valve capable of coping with pressure fluctuations between the inside of the tank and the atmosphere and preventing the internal fuel or the like from leaking to the outside even when the above-mentioned device equipped with a fuel tank falls over. [0002] Generally, when fuel is injected into a fuel tank and the lid is closed, the air in the tank expands or contracts as the temperature rises or falls, and the oil accompanying the consumption of fuel increases. The internal pressure of the fuel tank changes due to a decrease in surface and the like. For this reason, in order to maintain the pressure in the tank of the fuel tank within a certain range, a valve having a function of automatically establishing a communication state between the inside of the tank and the atmosphere is provided in the tank. However, in snowmobiles, jet skis, agricultural machines, and the like, which may fall during running or work, not only can the above-described change in the internal pressure of the fuel tank be caused, but also the fuel tank falls. Accordingly, there is a demand for a valve having a function of preventing internal fuel from leaking when the fuel cell is in an inverted state. Therefore, conventionally, as shown in FIGS. 6 and 7,
A rubber valve body 53 having a lip 52 at the center is baked on the outer periphery of a metal reinforcing ring 51 having an L-shaped cross section as the valve body 50, and a valve seat is provided on the metal reinforcing ring 51 obtained by sintering the valve body 53. 54 is inserted. The valve seat 54 described above is formed by a communication passage 55 communicating with the atmosphere side, and formed at the center by an inclined portion which is opened toward the outer periphery with which the lip 52 of the valve body 53 abuts. Substantially frustoconical valve seat
56 are provided, and notches 57, 57,... Are cut out at a plurality of positions above the inclined portion forming the valve seat 56, and the notches 57, 57,. It is configured to communicate with the communication passage 55. [0005] As described above, the valve seat 54 is attached to the metal reinforcing ring by firing the valve body 53 having the lip 52 at the center.
A valve body 50 formed by fitting to 51 is fitted to an upper portion of a fuel tank side casing 60 through which a gas flow passage 61 is pierced in the center,
Atmospheric side casing 63 in which gas flow passage 62 penetrates the center of fuel tank side casing 60 in which valve body 50 is fitted.
Is fitted. Reference numeral 64 denotes a net attached to a lower portion of the atmosphere side casing 63. As described above, the fuel tank side casing 60
When the pressure in the fuel tank is the same as that on the atmosphere side, the valve body 50 is sealed by the lip 52, but when the inside of the fuel tank becomes a negative pressure, the external pressure becomes atmospheric. Flow through the gas passage 62 of the side casing 63 to the flow passage 55 of the valve seat 54, the notches 57, 57,... And act on the lip 52 of the rubber valve body 53 to push the lip 52 open to release the atmosphere. The fuel flows into the fuel tank to reduce the pressure difference between the atmosphere and the fuel tank. When the pressure in the fuel tank becomes higher than that on the atmosphere side, the lip 52 of the rubber valve body 53 is pushed up along the inclined surface forming the valve seat 56 by the pressure and finally formed on the inclined surface. The lip into the notch 57
As a result, the pressure inside the fuel tank is released from the communication passage 55 of the valve seat 54 to the atmosphere through the gas flow passage 62 of the atmosphere-side casing 63 through the notch 57, thereby reducing the tank internal pressure. . As described above, the valve element 50 shown in FIGS.
Corresponds to pressure fluctuations in the tank, and furthermore, when a snowmobile or a jet ski equipped with such a valve body falls down and the fuel tank is in an inverted state, the rubber valve body 53 of the valve body 50 The lip 52 is pressed against the valve seat 56 formed by the inclined surface of the valve seat 54 to prevent leakage of fuel oil in the tank. In the above-described valve body, the members constituting the valve body 50 are complicated and the number of parts is large, so that not only is it troublesome to assemble, but also the production cost is large. And a rubber valve body 53 serving as a valve section.
The lip 52 is fitted to the inclined surface constituting the valve seat 56 with a tight allowance and is sealed by the elasticity of the lip 52, so that the pressure in the tank and the atmospheric pressure are not completely the same, ,
Due to the large number of parts and the variations due to their assembly, the variation in the tightening margin of the rubber lip varies greatly. There were points that required improvement, such as large variations. Therefore, the present invention solves the above problems,
The number of parts is small, the pressure in the tank is completely equal to the atmospheric pressure, and not only does the performance between products not vary, but also the target of fuel etc. even when the fuel tank is inverted. It is an object of the present invention to provide a check valve from which liquid does not leak. [0011] In order to achieve the above object, a check valve according to the present invention has the following features.
A tank-side cap having a sealing ball mounting table protruding and having a gas flow path provided therein, and an atmosphere side having a gas flow path communicating with the gas flow path of the tank-side cap opened therein so as to be fitted into the tank-side cap. Cap and
The sealing ball capable of sealing the gas flow path of the atmosphere-side cap, and the inside of the tank to which the tank-side cap is mounted is always in communication with the atmosphere through the two gas flow paths. And wherein the sealing ball seals the gas flow passage of the atmosphere side cap to prevent leakage of fuel and the like in the tank when the tank is placed in an inverted state. It is. The check valve according to the second aspect of the present invention provides a tank-side cap having a gas flow path formed on a protruding portion on which a sealing rubber sheet is mounted and a gas flow path, and a tank-side cap having a gas flow path. An air-side cap having an open gas flow passage communicating with the gas flow passage of the tank-side cap inside the fitting, and the sealing rubber sheet capable of sealing the gas flow passage of the air-side cap, Normally, the inside of the tank in which the above-mentioned tank-side cap is mounted and the atmosphere side communicate with each other through the two gas flow passages, and when the tank is in an inverted state, the sealing rubber sheet is in the atmosphere side cap. Is sealed to prevent leakage of fuel or the like in the tank. According to the check valve of the present invention, the sealing ball mounting base is protruded and the sealing ball is mounted on the sealing ball mounting base of the tank side cap provided with the gas flow passage. An air-side cap having an open gas flow passage communicating with a gas flow passage of the tank-side cap is provided inside the tank-side cap to be fitted into the tank-side cap. Since the inside and the atmosphere are communicated through the two gas flow passages, the pressure inside and outside the tank is kept the same, and equipment such as a vehicle on which the tank is mounted is overturned and the tank is overturned. Is closed, the sealing ball immediately seals the gas flow passage of the atmosphere side cap to prevent leakage of fuel or the like in the tank. [0014] Further, a tank-side cap provided with a gas flow passage at the protruding portion on which the sealing rubber sheet is placed and having a gas flow path, and the gas of the tank-side cap is fitted inside the tank-side cap. Since the air-side cap having an open gas flow passage communicating with the flow passage is provided, the inside of the tank in which the above-mentioned tank-side cap is mounted is always in communication with the atmosphere, and the inside of the tank and the atmosphere are at the same pressure. When a device such as a vehicle such as a snowmobile on which the tank is mounted falls down and the tank is placed in an inverted state, the sealing rubber sheet seals the gas flow passage of the atmosphere side cap, so the tank is mounted. It prevents the leakage of fuel and the like inside. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a normal state. FIG. Indicates a state in which the state is inverted. 1 and 2, 1 indicates a check valve,
The check valve 1 is mounted on a fuel tank (not shown) of a snowmobile, for example.
And a so-called breathing action is performed between the inside A of the fuel tank and the atmosphere side B. In FIG. 1, reference numeral 2 denotes a fuel tank-side cap. The fuel tank-side cap 2 has a peripheral projection 3 on which an atmosphere-side cap 10 is fitted, and is located at a center from the base of the peripheral projection 3. Horizontal part 4 inward to the part
A cylindrical body 6 having a gas flow passage 5 provided inside the horizontal part 4 is hung down, and a mounting table 8 for mounting a sealing ball 7 is protruded above the cylindrical body 6. . Reference numeral 10 denotes an atmosphere side cap provided with a periphery 11 to be fitted into the periphery projection 3 of the fuel tank side cap 2, and the atmosphere side cap 10
An inclined surface 12 in the diameter decreasing direction is formed toward the atmosphere side from 11, and an upper portion thereof serves as a gas flow passage 13 opened to the atmosphere. And a gas flow passage formed above the inclined surface 12
13 is provided at the center of the atmosphere-side cap 10, and a table 8 on which the sealing ball 7 of the fuel tank-side cap 2 is placed just below the center. Since the first embodiment of the present invention is constructed as described above, the sealing ball 7 is mounted on the mounting table 8 of the sealing ball 7 at the upper center of the fuel tank side cap 2, and the fuel When the atmosphere side cap 10 is inserted into the upper part of the tank side cap 2 to form the check valve 1, and this is mounted on the fuel tank,
The inside A of the fuel tank and the atmosphere side B communicate with each other via the gas flow path 5 of the cylindrical portion 6 of the fuel tank side cap 2 of the check valve 1 and the gas flow path 13 of the atmosphere side cap 10. Inside A and atmosphere side B have the same pressure. When a snowmobile or the like equipped with a fuel tank equipped with the above-described check valve 1 falls down while traveling, the fuel tank is placed in an inverted state. At this time, the sealing ball 7 is Gas flow passage 5 of fuel tank side cap 2
Riding on the flow of fuel that flows in further, it is separated from the mounting table 8 and abuts against the inclined surface 12 in the diameter-reducing direction of the air-side cap 10. Prevents fuel in tank A from flowing out to atmosphere B (Fig. 2
reference). As described above, when the fuel tank is in the inverted state, the sealing ball 7 moves on the fuel to flow out and seals the fuel. It is preferable that the specific gravity of the stopper ball 7 and the specific gravity of the target liquid such as fuel be made close to each other. Therefore, it is necessary to select and manufacture the sealing ball 7 from a resin having a specific gravity relatively close to the specific gravity of the target liquid. Good. In the check valve of the first embodiment constructed as described above, in the normal state, the inside of the fuel tank A and the atmosphere side B are kept in communication with each other, and the fuel tank is in the inverted state. In such a case, the sealing ball 7 immediately moves along with the flow of the target liquid such as fuel, and seals the gas flow passage on the atmosphere side to prevent the fuel from flowing out. In the first embodiment, the components are only the fuel tank side cap, the sealing ball, and the atmosphere side cap fitted into the fuel tank side cap, and the number of parts is extremely small. This is also simple, and even in the case of an inverted state, the response can be performed with extremely high response. FIGS. 3, 4 and 5 show a second embodiment of the present invention.
FIG. 3 shows a normal state, FIG. 4 shows a state in which equipment such as a vehicle equipped with a fuel tank is overturned and the fuel tank is in an inverted state, and FIG. 5 shows a state C- in FIG. The enlarged sectional view of the C line is shown. Further, in the second embodiment, the same components as those in the first embodiment will be described with the same reference numerals. In FIGS. 3 to 5, 1 is a check valve,
The check valve 1 is mounted on a fuel tank (not shown) of a snowmobile, for example.
A so-called respiratory action is performed between the two. In FIG. 3, the check valve 1 comprises a fuel tank-side cap 2 and an air-side cap 10 fitted on the upper portion of the fuel tank-side cap 2. Is the atmosphere side cap on the periphery
In addition to the provision of a peripheral projecting portion 3 into which a gas flow passage 5 is fitted, a cylindrical body 6 having a gas flow passage 5 formed therein is formed so as to hang down, and the upper end of the cylindrical body 6 and the upper peripheral edge of the gas flow passage 5 are sealed. A plurality of protrusions 21 on which the rubber sheet 22 is mounted
Are formed, and a sealing rubber sheet 22 is placed on the upper surfaces of the projections 21, 21,.... The above-mentioned atmosphere-side cap 10 is provided with a peripheral portion 11 fitted into the peripheral projecting portion 3 of the fuel tank-side cap 2 as described above, and forms a gas flow passage 13 opened to the center in the center. The gas flow passage 13 of the atmosphere-side cap 10 communicates with the gas flow passage 5 of the fuel tank-side cap 2 described above. Since the second embodiment is constructed as described above, the upper surface of the plurality of projections 21, 21,... Provided on the upper peripheral edge of the gas flow passage 5 of the fuel tank side cap 2 is formed. The sealing rubber sheet 22 is placed on the fuel tank side cap 2 and the atmosphere side cap 10 is inserted into the upper part of the fuel tank side cap 2 to form the check valve 1. When this is mounted on the fuel tank, the inside of the fuel tank A and the atmosphere side B The gas flow passage 5 of the cylindrical body 6 of the fuel tank side cap 2 of the check valve 1, the passage formed between the plurality of projections 21, 21, ... and the gas flow passage of the atmosphere side cap 10 The fuel tank A and the atmosphere side B have the same pressure. When a snowmobile or the like equipped with a fuel tank equipped with the above-described check valve 1 is traveling normally, the inside of the fuel tank A and the atmosphere side B are connected to the fuel tank side cap 2 as described above. From the gas flow path 5
, Even if the rubber sheet 22 is placed on the plurality of projections 21, 21, 21, ... provided on the upper peripheral edge of the projection 21
The flow of air flows without resistance by the passage formed between the fuel tank 21 and the inside of the fuel tank and the atmosphere side communicates with each other. In the above embodiment, a plurality of projections 21, 21, ... are provided to form a flow path that flows from the gas flow path 5 of the cap 2 on the fuel tank side to the cap 10 on the atmosphere side. However, what forms the flow path is not limited to the plurality of protrusions described above, and may be, for example, a notch or the like. When the above-mentioned snowmobile or the like falls down during traveling, the above-mentioned fuel tank is in an inverted state. At this time, the fuel tank is placed on the projections 21, 21,... The rubber sheet 22 is mounted on the flow of the fuel flowing from the gas flow passage 5 of the fuel tank side cap 2 and the projections 21, 21,.
It is pressed by the liquid pressure against the inlet of the gas flow passage 13 of the cap 10 on the atmosphere side, which is separated from the upper side, seals this part, and prevents the outflow of the target liquid such as fuel (see FIG. 4). As described above, when the fuel tank is in an inverted state, the rubber sheet 22 is placed on the fuel to be discharged and the gas in the atmosphere-side cap 10 from the upper surface of the projection 21 of the fuel tank-side cap 2 The rubber sheet 22 moves toward the inlet of the flow passage 13 and seals this portion. The function of the seal is affected by the thickness of the rubber sheet 22. That is, if the thickness of the rubber sheet 22 is large, its rigidity is increased, causing a problem in sealing performance, and a thin one causes a problem in manufacturing. Therefore, in this embodiment, the thickness of the rubber sheet 22 is set to 0.1 to 1.0 mm. However, if it exceeds 1.0 mm, there is a problem in the sealing property, and if it is less than 0.1 mm, it is difficult to manufacture, so the thickness is preferably 0.2 to 0.8 mm. In the check valve of the second embodiment constructed as described above, in the normal state, the inside of the fuel tank A and the atmosphere side B are kept in communication with each other, and the fuel tank is in the inverted state. At that time, the sealing rubber sheet 22 immediately moves along with the flow of the target liquid such as fuel, and seals the gas flow passage of the atmosphere side cap to prevent the fuel from flowing out. In the second embodiment, the components are a fuel tank side cap,
There is only the rubber sheet for sealing and the atmosphere side cap fitted into the fuel tank side cap, the number of parts is extremely small, the assembly is easy, and the response is extremely responsive even when it is reversed. Is what you can do. The check valve according to the present invention keeps the inside of the fuel tank in communication with the atmosphere when in a normal state, and the equipment such as a vehicle mounted with the tank falls over and the tank is inverted. Since the sealing member immediately seals the gas flow path of the atmosphere side cap when the tank is placed, the fuel does not flow out of the tank even when the tank is placed upside down. Also,
In the present invention, the check valve is composed only of the tank-side cap, the atmosphere-side cap and the sealing member to be fitted therein, so that the number of parts is extremely small, so that the assembly is simple and troublesome. And the response can be performed with extremely high response even when the tank is in an inverted state.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view of a check valve in a normal state of the first embodiment. FIG. 2 is an explanatory view of a check valve in an inverted state of the first embodiment. 3] Explanatory view of the check valve in the normal state of the second embodiment [FIG. 4] Explanatory view of the check valve in the reverse state of the second embodiment [FIG. 5] Line CC in FIG. [Fig. 6] Explanatory drawing of conventional check valve [Fig. 7] Enlarged cross-sectional view of valve in Fig. 7 [Description of symbols] 1 Check valve 2 Fuel tank side cap 10 Atmospheric side cap 8 Mounting table 7 Sealing ball 22 Rubber sheet 5,13 Gas flow passage

Claims (1)

Claims 1. A tank-side cap having a sealing ball mounting table protruding therefrom and provided with a gas flow passage, and the gas of said tank-side cap being fitted inside said tank-side cap. A tank provided with an atmosphere-side cap having an open gas flow path communicating with the flow path, and the sealing ball capable of sealing the gas flow path of the atmosphere-side cap, wherein the tank-side cap is always mounted The inside and the atmosphere side communicate with each other through the two gas flow paths, and when the tank is placed in an inverted state, the sealing ball seals the gas flow path of the atmosphere side cap, and the fuel and the like in the tank. A check valve configured to prevent leakage of the fluid. 2. A tank-side cap having a gas-flowing means formed on a projecting portion on which a sealing rubber sheet is placed, and a gas-flow passage provided therein, and the gas of said tank-side cap being fitted inside said tank-side cap. An atmosphere-side cap having an open gas flow path communicating with the flow path; and the sealing rubber sheet capable of sealing the gas flow path of the atmosphere-side cap, and the tank-side cap described above is always attached. The inside of the tank and the atmosphere side communicate with each other through the two gas flow paths, and when the tank is in an inverted state, the sealing rubber sheet seals the gas flow path of the atmosphere side cap and the inside of the tank. A check valve configured to prevent leakage of fuel or the like.