Vacuum-proof valve for oil tank of generator set

Abstract

The utility model discloses a generator set fuel tank anti-vacuum valve which comprises an outer vent valve body, a sealing ring, a movable pressing plate, a spring and an inner vent valve body, the outer vent valve body comprises an outer vent pipe, an air inlet and outlet reversing chamber and a guide cavity, and the inner vent valve body comprises an inner vent pipe and a connecting sleeve. The connecting sleeve is inserted into the guide cavity to coaxially and hermetically connect the outer vent valve body and the inner vent valve body, an outlet of the outer vent pipe is connected with the air filter device through the evaporation pipe, and the inner vent pipe is connected with a vent of the oil tank through the evaporation pipe; the movable pressing plate is arranged in the guide cavity in a reciprocating sliding mode and comprises a pressing plate flange and a center air guide pipe, the sealing ring is arranged on one side of the pressing plate flange in a sleeving mode, the spring is arranged between the other side of the pressing plate flange and the connecting sleeve, and the spring is used for pushing the movable pressing plate and the sealing ring to be dynamically connected with the end face of the air inlet and outlet reversing chamber in a sealed mode; the small hole is used for exhausting air outwards during exhausting, the sectional area of the air inlet can be rapidly enlarged during air suction, the vacuum negative pressure phenomenon in the oil tank is avoided, and the oil tank of the generator set is protected.

Description

Technical Field

[0001] The utility model relates to the field of generators, in particular to an anti-vacuum valve for an oil tank of a generator set. Background Art

[0002] There is usually only a vent in the fuel tank of the generator. The vent is used to discharge the oil and gas generated by the evaporation of gasoline in the fuel tank into the air filter when the fuel tank pressure is greater than the external air pressure, so as to avoid excessive pressure when there is too much oil in the tank; when the fuel tank pressure is lower than the external air pressure, the outside air is introduced into the fuel tank to avoid negative pressure after the oil in the tank is pumped out, and to avoid the fuel tank being crushed due to negative pressure.

[0003] The air vent in the prior art is relatively simple. In order to prevent the fuel tank from being flattened, the cross-sectional area of ​​the air vent is usually large, which causes the oil and gas in the fuel tank to be discharged out of the fuel tank too quickly. The excessive discharge of oil and gas can easily cause a large loss of gasoline in the fuel tank, which is not conducive to energy saving and cost reduction, and can easily produce a vacuum, resulting in the gasoline in the fuel tank being unable to flow, causing the engine to be cut off from fuel. Utility Model Content

[0004] In order to solve the above problems, the purpose of the utility model is to provide a generator set oil tank anti-vacuum valve, which can prevent the oil and gas in the oil tank from being discharged out of the oil tank too quickly, and can quickly open the air inlet cross-sectional area when the oil tank pressure is lower than the external air pressure to avoid the vacuum negative pressure phenomenon in the oil tank, which is beneficial to protecting the generator set oil tank and preventing the engine from shutting down due to oil shortage.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A generator oil tank anti-vacuum valve, comprising an external vent valve body, a sealing ring, a movable pressure plate, a spring and an internal vent valve body, the external vent valve body comprising an external vent pipe, an inlet and outlet air reversing chamber and a guide cavity, the internal vent valve body comprising an internal vent pipe and a connecting sleeve, the connecting sleeve is inserted into the guide cavity to coaxially seal the external vent valve body and the internal vent valve body, the outlet of the external vent pipe is connected to an air filter device through an evaporating pipe, the internal vent pipe is connected to the vent port of the oil tank through the evaporating pipe; the movable pressure plate can be reciprocatingly slidably arranged in the guide cavity, the movable pressure plate comprises a pressure plate flange and a central air guide pipe, the sealing ring is arranged on one side of the pressure plate flange, A spring is arranged between the other side of the pressure plate flange and the connecting sleeve, and the spring is used to push the movable pressure plate and the sealing ring to be dynamically sealed and connected with the end face of the inlet and outlet air reversing chamber; when the oil tank pressure is greater than the external air pressure, the gas in the box passes through the evaporator pipe, the internal ventilation pipe, the central air guide pipe, the inlet and outlet air reversing chamber and the external ventilation pipe, and is discharged to the outside through the evaporator pipe; when the oil tank pressure is lower than the external air pressure, the thrust force generated by the air pressure difference compresses the spring to separate the sealing ring from the end face of the inlet and outlet air reversing chamber, and the outside air is input into the internal ventilation pipe through the evaporator pipe, the external ventilation pipe, the inlet and outlet air reversing chamber, the guide cavity and the central air guide pipe, and then is transported to the oil tank through the evaporator pipe through the internal ventilation pipe.

[0007] Furthermore, the outer diameter of the pressure plate flange is smaller than the inner diameter of the guide cavity.

[0008] Furthermore, the outer ring of the pressure plate flange is provided with a toothed flange.

[0009] Furthermore, the central air duct extends to both sides of the pressure plate flange, and an annular recess for fixing the sealing ring is provided on the central air duct on one side.

[0010] Furthermore, a first groove is provided on the other side of the pressure plate flange for accommodating the end of one side of the spring.

[0011] Furthermore, a second groove is provided on the inner side of the connecting sleeve for accommodating the end of the other side of the spring.

[0012] Furthermore, an air flow baffle is provided at the inner port of the inner ventilation pipe.

[0013] The utility model has the following beneficial effects:

[0014] The utility model arranges an external vent valve body, a sealing ring, a movable pressure plate, a spring and an internal vent valve body. When exhausting, the smaller central air guide pipe in the movable pressure plate is used to output the oil and gas in the oil tank to avoid being discharged out of the oil tank too quickly. When the oil tank pressure is lower than the external air pressure, the movable pressure plate can be quickly pushed open to quickly open the cross-sectional area of ​​the air inlet and avoid the vacuum negative pressure phenomenon in the oil tank, which is beneficial to protecting the oil tank of the generator set and preventing the engine from shutting down due to oil shortage.

[0015] The utility model ingeniously utilizes the pressure difference between the inside and outside of the oil tank to control the spring, thereby realizing the movable sealing and opening of the movable pressure plate. The overall structure is ingenious, and the exhaust and intake work of the oil tank is stable and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional schematic diagram of the anti-vacuum valve of the oil tank of the generator set of the utility model.

[0017] Figure 2 The utility model is an exploded schematic diagram of the anti-vacuum valve of the oil tank of the generator set.

[0018] Figure 3 It is a cross-sectional schematic diagram of the external ventilation valve body of the utility model.

[0019] Figure 4 It is a three-dimensional schematic diagram of the movable pressing plate of the utility model.

[0020] Figure 5 It is a three-dimensional schematic diagram of the internal ventilation valve body of the utility model.

[0021] 1. External ventilation valve body; 11. External ventilation pipe; 12. Inlet and outlet air reversing chamber; 13. Guide chamber; 2. Sealing ring; 3. Movable pressure plate; 31. Pressure plate flange; 311. First groove; 32. Central air guide pipe; 321. Annular concave platform; 4. Spring; 5. Internal ventilation valve body; 51. Internal ventilation pipe; 52. Connecting sleeve; 521. Second groove; 53. Air flow baffle. DETAILED DESCRIPTION

[0022] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0023] See also Figure 1-5As shown, a generator oil tank anti-vacuum valve comprises an external vent valve body 1, a sealing ring 2, a movable pressure plate 3, a spring 4 and an internal vent valve body 5, wherein the external vent valve body 1 comprises an external vent pipe 11, an inlet and outlet air reversing chamber 12 and a guide cavity 13, and the internal vent valve body 5 comprises an internal vent pipe 51 and a connecting sleeve 52, wherein the ventilation cross-sectional area of ​​the internal vent pipe 51 meets the requirement of rapid air intake, and the connecting sleeve 52 is inserted into the guide cavity 13 to coaxially connect the external vent valve body 1 and the internal vent valve body 5 The outer vent pipe 11 is connected with the air filter device through the evaporating pipe, and the inner vent pipe 51 is connected with the vent of the fuel tank through the evaporating pipe; the movable pressure plate 3 is reciprocatingly slidably arranged in the guide cavity 13, the movable pressure plate 3 comprises a pressure plate flange 31 and a central air guide pipe 32, the sealing ring 2 is sleeved on one side of the pressure plate flange 31, the spring 4 is arranged between the other side of the pressure plate flange 31 and the connecting sleeve 52, the spring 4 is used to push the movable pressure plate 3 and the sealing ring 2 to be dynamically sealed and connected with the end face of the inlet and outlet air reversing chamber 12; when the fuel tank pressure is greater than the external air pressure (such as when the fuel is full or the temperature is high and the gasoline evaporates a lot), the gas in the box is discharged to the outside through the evaporating pipe, the inner vent pipe 51, the central air guide pipe 32, the inlet and outlet air reversing chamber 12 and the outer vent pipe 11 through the evaporating pipe, the hole cross-sectional area in the central air guide pipe 32 is relatively small, which can prevent excessive oil and gas from being discharged to the outside too quickly; the fuel tank pressure When the pressure is lower than the external air pressure (when the gasoline in the tank is used up quickly), when the thrust generated by the air pressure difference is greater than the pressure of the spring 4, the thrust generated by the air pressure difference compresses the spring 4 to separate the sealing ring 2 from the end face of the inlet and outlet air reversing chamber 12, and the outside air is input into the internal ventilation pipe 51 through the evaporator pipe, the external ventilation pipe 11, the inlet and outlet air reversing chamber 12, the guide cavity 13 and the central air guide pipe 32, and then transported to the fuel tank through the evaporator pipe, so as to prevent the fuel tank from being flattened due to the low pressure in the fuel tank.

[0024] The outer diameter of the pressure plate flange 31 is smaller than the inner diameter of the guide cavity 13; and the outer ring of the pressure plate flange 31 may be provided with a toothed flange (such as a hexagonal toothed protrusion, etc.) to ensure the ventilation cross-sectional area and reduce wear.

[0025] The central air guide pipe 32 extends to both sides of the pressure plate flange 31, and an annular concave platform 321 for fixing the sealing ring 2 is provided on one side of the central air guide pipe 32. The other side of the pressure plate flange 31 is provided with a first groove 311 for accommodating the end of one side of the spring 4; the inner side of the connecting sleeve 52 is provided with a second groove 521 for accommodating the end of the other side of the spring 4, so as to stably fix the two ends of the spring 4. The inner port of the inner ventilation pipe 51 is provided with an air flow baffle 53, which can better prevent the evaporation and discharge of oil and gas.

[0026] The above description is only a specific implementation method of the utility model, and does not limit the patent scope of the utility model. Any equivalent structural transformation made using the contents of the utility model specification and drawings, or directly or indirectly used in other related technical fields, are also included in the patent protection scope of the utility model.

Claims

1. A generator oil tank anti-vacuum valve, characterized in that: The invention comprises an external ventilation valve body (1), a sealing ring (2), a movable pressure plate (3), a spring (4) and an internal ventilation valve body (5), wherein the external ventilation valve body (1) comprises an external ventilation pipe (11), an inlet and outlet air reversing chamber (12) and a guide chamber (13), and the internal ventilation valve body (5) comprises an internal ventilation pipe (51) and a connecting sleeve (52), wherein the connecting sleeve (52) is inserted into the guide chamber (13) to coaxially seal and connect the external ventilation valve body (1) and the internal ventilation valve body (5), wherein the outlet of the external ventilation pipe (11) is connected to an air filter device via an evaporating pipe, and the internal ventilation pipe (51) is connected to a ventilation port of a fuel tank via the evaporating pipe; the movable pressure plate (3) is reciprocatingly slidably arranged in the guide chamber (13), the movable pressure plate (3) comprises a pressure plate flange (31) and a central air guide pipe (32), and the sealing ring (2) is sleeved on the pressure plate flange (3 1) on one side, the spring (4) is arranged between the other side of the pressure plate flange (31) and the connecting sleeve (52), and the spring (4) is used to push the movable pressure plate (3) and the sealing ring (2) to be dynamically sealed and connected with the end surface of the inlet and outlet air reversing chamber (12); when the oil tank pressure is greater than the external air pressure, the gas in the tank passes through the evaporation pipe, the internal ventilation pipe (51), the central air guide pipe (32), the inlet and outlet air reversing chamber (12) and the external ventilation pipe (11), and is discharged to the outside through the evaporation pipe; when the oil tank pressure is lower than the external air pressure, the thrust generated by the air pressure difference compresses the spring (4) to separate the sealing ring (2) from the end surface of the inlet and outlet air reversing chamber (12), and the external air is input into the internal ventilation pipe (51) through the external ventilation pipe (11), the inlet and outlet air reversing chamber (12), the guide cavity (13) and the central air guide pipe (32), and then is transported to the oil tank through the evaporation pipe.

2. The anti-vacuum valve for the oil tank of a generator set according to claim 1, characterized in that: The outer diameter of the pressure plate flange (31) is smaller than the inner diameter of the guide cavity (13).

3. A generator oil tank anti-vacuum valve according to claim 1 or 2, characterized in that: The outer ring of the pressure plate flange (31) is provided with a toothed flange.

4. The anti-vacuum valve for the oil tank of a generator set according to claim 1, characterized in that: The central air guide pipe (32) extends to both sides of the pressure plate flange (31), and an annular recess (321) for fixing the sealing ring (2) is provided on the central air guide pipe (32) on one side.

5. The anti-vacuum valve for the oil tank of a generator set according to claim 4, characterized in that: The other side of the pressure plate flange (31) is provided with a first groove (311) for accommodating an end of one side of the spring (4).

6. The anti-vacuum valve for the oil tank of a generator set according to claim 5, characterized in that: A second groove (521) is provided on the inner side of the connecting sleeve (52) for accommodating the other end of the spring (4).

7. The anti-vacuum valve for the oil tank of a generator set according to claim 1, characterized in that: An inner port of the inner ventilation pipe (51) is provided with an air flow baffle (53).

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