CN114087371A - Oil tank isolating valve - Google Patents
Oil tank isolating valve Download PDFInfo
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- CN114087371A CN114087371A CN202111210884.XA CN202111210884A CN114087371A CN 114087371 A CN114087371 A CN 114087371A CN 202111210884 A CN202111210884 A CN 202111210884A CN 114087371 A CN114087371 A CN 114087371A
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- valve
- shell
- opening
- pressure relief
- valve head
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M25/0836—Arrangement of valves controlling the admission of fuel vapour to an engine, e.g. valve being disposed between fuel tank or absorption canister and intake manifold
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/52—Means for additional adjustment of the rate of flow
- F16K1/526—Means for additional adjustment of the rate of flow for limiting the maximum flow rate, using a second valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/029—Electromagnetically actuated valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/06—Actuating devices; Operating means; Releasing devices electric; magnetic using a magnet, e.g. diaphragm valves, cutting off by means of a liquid
- F16K31/0644—One-way valve
- F16K31/0655—Lift valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
- F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
- F02M2025/0845—Electromagnetic valves
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Electromagnetism (AREA)
- Fluid Mechanics (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Safety Valves (AREA)
Abstract
The application discloses an oil tank isolation valve which comprises a shell, an oil tank pipeline joint, a carbon tank pipeline joint, an electromagnetic coil assembly, a valve head assembly, an air supplementing reset spring, a pressure relief valve head and a pressure relief reset spring, wherein the shell is provided with a plurality of oil tank pipeline joints; the shell comprises an upper valve shell, a middle valve shell and a lower valve shell; the oil tank pipeline joint is connected with the middle valve shell, the inner cavity of the oil tank pipeline joint is communicated with the first air chamber, and the carbon tank pipeline joint is connected with the lower valve shell; the solenoid coil assembly is arranged in the upper valve shell, gas pressure in the lower valve shell acts on the valve head assembly to enable the valve head assembly to have a tendency of opening the first opening, and the air replenishing return spring acts on the valve head assembly to enable the valve head assembly to have a tendency of plugging the first opening; the pressure relief reset spring acts on the pressure relief valve head to enable the pressure relief valve head to have the trend of plugging the air guide channel, and the gas pressure of the first gas chamber acts on the pressure relief valve head through the air guide channel to enable the pressure relief valve head to have the trend of opening the air guide channel. The oil tank isolation valve is simplified in structure and high in control reliability.
Description
Technical Field
The application relates to the technical field of automobile isolation valves, in particular to an oil tank isolation valve.
Background
With the vigorous development of the modern automobile industry, control of the problems of automobile exhaust emission, fuel evaporation leakage pollution and the like has become one of the key contents in the automobile research and development process. Under the condition that stored oil gas in the carbon tank is saturated and cannot be timely desorbed, the oil tank isolation valve is used for isolating oil gas continuously generated in the oil tank inside the oil tank and preventing the oil gas from flowing into the carbon tank so as to prevent the carbon tank from overloading and cause the oil gas leakage to become an important means for controlling the leakage and the discharge of oil gas pollutants.
Chinese patent No. CN108626450A discloses an oil tank isolation valve, which separates oil gas in an oil tank by means of an air-supply return spring, a pressure-relief return spring and a flow-limiting return spring, so that the oil gas does not continuously enter a carbon tank. However, the oil tank isolating valve can realize the functions of air supplement, pressure relief and oil filling only by using three springs, has a complex structure and a plurality of control points, and brings difficulties to design and control.
Disclosure of Invention
The application aims to provide an oil tank isolating valve, and the problems that an existing oil tank isolating valve is complex in structure and multiple in control point are solved.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect, the present application provides a tank isolation valve comprising: the air-conditioning valve comprises a shell, a valve body and a valve body, wherein the shell comprises an upper valve shell, a middle valve shell and a lower valve shell, two ends of the middle valve shell are respectively connected with the upper valve shell and the lower valve shell, and the upper valve shell and the middle valve shell form a first air chamber; the fuel tank pipeline joint is connected with the middle valve shell, the inner cavity of the fuel tank pipeline joint is communicated with the first air chamber, the carbon tank pipeline joint is connected with the lower valve shell, the middle valve shell or the lower valve shell is provided with a first opening for communicating the first air chamber with the inner cavity of the lower valve shell, and the lower valve shell is provided with a second opening for communicating the inner cavity of the lower valve shell with the inner cavity of the carbon tank pipeline joint; the solenoid assembly is arranged in the upper valve shell, the valve head assembly extends into the middle valve shell, the solenoid assembly is used for driving the valve head assembly to be close to or far away from the first opening so as to seal or open the first opening, gas pressure in the lower valve shell acts on the valve head assembly so that the valve head assembly has a tendency of opening the first opening, the air replenishing return spring acts on the valve head assembly so that the valve head assembly has a tendency of sealing the first opening, and an air guide channel for communicating the first air chamber with an inner cavity of the lower valve shell is arranged on the valve head assembly; pressure release valve head and pressure release reset spring, pressure release valve head and pressure release reset spring set up in the lower valve casing, pressure release reset spring is used in order to make the pressure release valve head have the trend of shutoff air guide channel on the pressure release valve head, the gas pressure of first air chamber passes through the air guide channel and is used in order to make the pressure release valve head have the trend of opening the air guide channel on the pressure release valve head.
In some optional embodiments, the carbon canister pipeline connector comprises a lower valve housing, a lower valve housing inner cavity is arranged in the lower valve housing, the lower valve housing inner cavity is divided into a second air chamber and a third air chamber, the second air chamber is communicated with a first opening, the third air chamber is communicated with the carbon canister pipeline connector inner cavity through a second opening, a flow limiting hole penetrating through the opposite upper surface and the lower surface is formed in the flow limiting valve, a pressure relief return spring acts on the flow limiting valve to enable the flow limiting valve to have a tendency of opening the second opening, and the gas pressure of the second air chamber acts on the flow limiting valve to enable the flow limiting valve to have a tendency of blocking the second opening.
In some optional embodiments, two ends of the pressure relief return spring are respectively fixed at the second opening and the lower surface of the flow limiting valve, and the pressure relief valve head is arranged on the upper surface of the flow limiting valve.
In some optional embodiments, the middle valve casing or the lower valve casing is further provided with a pressure relief channel communicated with the air guide channel, the pressure relief channel is arranged at the first opening, and the pressure relief valve head blocks or opens the air guide channel by blocking or opening the pressure relief channel.
In some optional embodiments, the valve head assembly comprises a valve head base and a pressure relief valve rod, the air guide channel is arranged on the valve head base, two ends of the pressure relief valve rod are respectively connected with the electromagnetic coil assembly and the valve head base, and the air supply return spring is sleeved on the pressure relief valve rod.
In a second aspect, the present application provides a further tank isolation valve comprising: the air-conditioning valve comprises a shell, a valve body and a valve body, wherein the shell comprises an upper valve shell, a middle valve shell and a lower valve shell, two ends of the middle valve shell are respectively connected with the upper valve shell and the lower valve shell, and the upper valve shell and the middle valve shell form a first air chamber; the fuel tank pipeline joint is connected with the middle valve shell, the inner cavity of the fuel tank pipeline joint is communicated with the first air chamber, the carbon tank pipeline joint is connected with the lower valve shell, the middle valve shell or the lower valve shell is provided with a first opening for communicating the first air chamber with the inner cavity of the lower valve shell, and the lower valve shell is provided with a second opening for communicating the inner cavity of the lower valve shell with the inner cavity of the carbon tank pipeline joint; the driving mechanism is arranged in the upper valve shell, the valve head assembly extends into the middle valve shell, the driving mechanism is used for driving the valve head assembly to be close to or far away from the first opening so as to seal or open the first opening, and an air guide channel used for communicating the first air chamber with an inner cavity of the lower valve shell is arranged on the valve head assembly; pressure release valve head and pressure release reset spring, pressure release valve head and pressure release reset spring set up in the lower valve casing, pressure release reset spring is used in order to make the pressure release valve head have the trend of shutoff air guide channel on the pressure release valve head, the gas pressure of first air chamber passes through the air guide channel and is used in order to make the pressure release valve head have the trend of opening the air guide channel on the pressure release valve head.
In some optional embodiments, the carbon canister pipeline connector comprises a lower valve housing, a lower valve housing inner cavity is arranged in the lower valve housing, the lower valve housing inner cavity is divided into a second air chamber and a third air chamber, the second air chamber is communicated with a first opening, the third air chamber is communicated with the carbon canister pipeline connector inner cavity through a second opening, a flow limiting hole penetrating through the opposite upper surface and the lower surface is formed in the flow limiting valve, a pressure relief return spring acts on the flow limiting valve to enable the flow limiting valve to have a tendency of opening the second opening, and the gas pressure of the second air chamber acts on the flow limiting valve to enable the flow limiting valve to have a tendency of blocking the second opening.
In some optional embodiments, two ends of the pressure relief return spring are respectively fixed at the second opening and the lower surface of the flow limiting valve, and the pressure relief valve head is arranged on the upper surface of the flow limiting valve.
In some optional embodiments, the middle valve casing or the lower valve casing is further provided with a pressure relief channel communicated with the air guide channel, the pressure relief channel is arranged at the first opening, and the pressure relief valve head blocks or opens the air guide channel by blocking or opening the pressure relief channel.
In some optional embodiments, further comprising an air supply return spring acting on the valve head assembly to cause the valve head assembly to have a tendency to close the first opening, the gas pressure in the lower valve housing acting on the valve head assembly to cause the valve head assembly to have a tendency to open the first opening; the valve head assembly comprises a valve head base and a pressure relief valve rod, the air guide channel is arranged on the valve head base, the two ends of the pressure relief valve rod are respectively connected with the driving mechanism and the valve head base, and the air supply reset spring is sleeved on the pressure relief valve rod.
Compared with the prior art, the beneficial effects of this application include at least:
the oil tank isolating valve of this application is through setting up pressure release reset spring in lower valve casing, and the structure is simplified, pressure release process control point is few, so it has the effect of simplifying structural design. Especially when the flow limiting valve is further arranged, the pressure relief return spring is reused as the flow limiting return spring, the number of the return springs of the oil tank isolating valve can be reduced to two, the structural design is simplified, control points in the pressure relief, air supplement or oil filling process can be reduced, the manufacturing difficulty is reduced on the basis of keeping all functions of the original isolating valve, and the control reliability of the pressure relief, air supplement or oil filling is improved.
Drawings
The present application is further described below with reference to the drawings and examples.
FIG. 1 is a schematic perspective view of a tank isolation valve according to a first embodiment of the present application;
FIG. 2 is a schematic cross-sectional view of a tank isolation valve according to a first embodiment of the present application;
FIG. 3 is an enlarged schematic view of the circled portion of FIG. 2;
FIG. 4 is a schematic diagram of the pressure relief condition of the oil tank isolation valve in the first embodiment of the application;
FIG. 5 is a schematic view illustrating a gas supplementing operation mode of the fuel tank isolating valve according to the first embodiment of the present application;
FIG. 6 is a schematic diagram of a refueling condition of the tank isolation valve according to the first embodiment of the application.
The figure is as follows: 10. a housing; 11. an upper valve shell; 12. a middle valve shell; 13. a lower valve housing; 14. a first air chamber; 15. a first opening; 16. a second opening; 17. a second air chamber; 18. a third air chamber; 20. a tank line connector; 21. a carbon tank pipeline joint; 22. an oil tank; 23. a carbon tank; 30. an electromagnetic coil assembly; 40. a valve head assembly; 41. a gas-supplementing return spring; 42. a pressure relief valve stem; 43. an air guide channel; 44. a pressure relief channel; 45. a valve head base; 51. a pressure relief valve head; 52. a pressure relief return spring; 53. a flow-limiting valve; 54. a flow restriction orifice; 501. conventional pressure relief airflow; 502. air flow is supplemented; 503. and (5) oiling to release pressure and air flow.
Detailed Description
The present application is further described with reference to the accompanying drawings and the detailed description, and it should be noted that, in the present application, the embodiments or technical features described below may be arbitrarily combined to form a new embodiment without conflict.
The first embodiment is as follows:
referring to fig. 1, 2 and 3, the first embodiment provides a tank isolation valve, which includes a housing 10, a tank line connector 20, a canister line connector 21, a solenoid assembly 30, a valve head assembly 40, an air supply return spring 41, a pressure relief valve head 51 and a pressure relief return spring 52.
The housing 10 includes an upper valve housing 11, a middle valve housing 12 and a lower valve housing 13, both ends of the middle valve housing 12 are respectively connected to the upper valve housing 11 and the lower valve housing 13, and the upper valve housing 11 and the middle valve housing 12 form a first air chamber 14.
The oil tank pipeline joint 20 is connected with the middle valve shell 12, and the inner cavity of the oil tank pipeline joint 20 is communicated with the first air chamber 14; the canister pipe joint 21 is connected with the lower valve casing 13; the middle valve housing 12 or the lower valve housing 13 is provided with a first opening 15 for communicating the first air chamber 14 with the inner cavity of the lower valve housing 13, and the lower valve housing 13 has a second opening 16 for communicating the inner cavity of the lower valve housing 13 with the inner cavity of the canister line connector 21. The tank line connector 20 may be further communicated with an oil tank 22, and the canister line connector 21 may be further communicated with a canister 23.
The solenoid assembly 30 is arranged in the upper valve housing 11, the valve head assembly 40 extends into the middle valve housing 12, the solenoid assembly 30 is used for driving the valve head assembly 40 to be close to or far away from the first opening 15 so as to block or open the first opening 15, the gas pressure in the lower valve housing 13 acts on the valve head assembly 40 so that the valve head assembly 40 has a tendency of opening the first opening 15, the gas supplementing return spring 41 acts on the valve head assembly 40 so that the valve head assembly 40 has a tendency of blocking the first opening 15, and the valve head assembly 40 is provided with a gas guide channel 43 for communicating the first gas chamber 14 with the inner cavity of the lower valve housing 13.
The pressure relief valve head 51 and the pressure relief return spring 52 are provided in the lower valve housing 13, the pressure relief return spring 52 acts on the pressure relief valve head 51 to cause the pressure relief valve head 51 to have a tendency to close the air guide passage 43, and the gas pressure of the first gas chamber 14 acts on the pressure relief valve head 51 through the air guide passage 43 to cause the pressure relief valve head 51 to have a tendency to open the air guide passage 43.
The valve head assembly 40 can seal or open the first opening 15 through the change of the pressure difference between the oil tank 22 and the carbon tank 23 and the spring force of the air replenishing return spring 41 acting on the valve head assembly 40, so that the oil tank isolation valve realizes air replenishing; acting on the valve head assembly 40 through the solenoid assembly 30 to cause the valve head assembly 40 to block or open the first opening 15 to enable refueling through the tank isolation valve; the pressure relief valve head 51 can block or open the air passage 43 to allow the tank isolation valve to be vented by the pressure differential between the tank 22 and the canister 23 and the pressure relief return spring 52 acting on the pressure relief valve head 51.
The pressure relief return spring 52 is arranged in the lower valve casing 13, the pressure relief return spring 52 acts on the pressure relief valve head 51 to seal or open the air guide channel 43, and the oil tank isolation valve can realize the pressure relief function without limiting and positioning the pressure relief return spring 52 in the valve head assembly 40. Compared with the existing oil tank isolating valve, the pressure relief return spring 52 is arranged in the lower valve shell 13, so that the structure is simplified, the control points of the pressure relief process are few, and the effect of simplifying the structural design is achieved.
In specific implementation, the oil tank isolation valve may further include a flow limiting valve 53, the flow limiting valve 53 is disposed in the lower valve housing 13 and divides an inner cavity of the lower valve housing 13 into a second air chamber 17 and a third air chamber 18, the second air chamber 17 communicates with the first opening 15, the third air chamber 18 communicates with an inner cavity of the canister pipe joint 21 through the second opening 16, a flow limiting hole 54 penetrating through the opposite upper surface and lower surface is disposed on the flow limiting valve 53, the pressure relief return spring 52 acts on the flow limiting valve 53 to enable the flow limiting valve 53 to have a tendency of opening the second opening 16, and the gas pressure of the second air chamber 17 acts on the flow limiting valve 53 to enable the flow limiting valve 53 to have a tendency of blocking the second opening 16.
Specifically, two ends of the pressure relief return spring 52 may be fixed at the second opening 16 and the lower surface of the flow limiting valve 53, respectively, and the pressure relief valve head 51 is disposed on the upper surface of the flow limiting valve 53. The restrictor valve 53, under the action of the gas pressure in the second air chamber 17 and the relief return spring 52, can close or open the second opening 16 to allow the flow of gas from the tank 22 to the canister 23 to pass through the restrictor orifice 54. Multiplexing the reset spring that is restriction valve 53 with pressure release reset spring 52, can realize the function that restriction valve 53 resets, cooperation restriction orifice 54 is with this restriction effect that realizes the oil tank isolating valve, compares with prior art, and the oil tank isolating valve of this application has kept all functions of original isolating valve, but can simplify product structural design, has reduced reset spring's quantity and control point.
In a specific implementation, the middle valve housing 12 or the lower valve housing 13 may further be provided with a pressure relief channel 44 communicating with the air guide channel 43, the pressure relief channel 44 is provided at the first opening 15, and the pressure relief valve head 51 blocks or opens the air guide channel 43 by blocking or opening the pressure relief channel 44. Wherein the air guide channel 43 can be an inclined pressure relief hole arranged on the valve head assembly 40, the air guide channel 43 is communicated with the first air chamber 14 and the pressure relief channel 44, the pressure relief valve head 51 can be matched with the contact surface of the pressure relief channel 44, the pressure relief channel 44 is blocked by the pressure relief valve head 51, the tightness when the channel is blocked can be better, and the structure design is convenient to be carried out above the space.
In a specific implementation, the valve head assembly 40 may include a valve head base 45 and a pressure relief valve stem 42, with the air guide channel 43 disposed on the valve head base 45. The two ends of the pressure relief valve rod 42 are respectively connected with the electromagnetic coil assembly 30 and the valve head base 45, so that the gas flow is controlled by the electromagnetic coil assembly 30 to be convenient for oiling. The air supply return spring 41 is sleeved on the pressure relief valve rod 42, so that the structure of the oil tank isolating valve is more compact, and the volume of the valve head assembly 40 can be further reduced.
Referring to fig. 1, 2 and 4, the pressure relief operation process of the tank isolation valve in the first embodiment is as follows:
when the gas pressure of the oil tank is greater than the pressure of the carbon canister and the pressure difference between the two is greater than the set pressure relief threshold, the resulting pressure difference acts on the pressure relief valve head 51 through the air guide channel 43 to make the pressure relief valve head 51 overcome the force of the pressure relief return spring 52, pushing the pressure relief valve head 51 to move downward and opening the air guide channel 43. At this time, the first air chamber 14 is communicated with the second air chamber 17, and the air in the oil tank 22 passes through the inner cavity of the oil tank pipeline connector 20, the first air chamber 14, the air guide channel 43 of the valve head base 45, the pressure relief channel 44, the second air chamber 17 and the third air chamber 18 in sequence, and is transmitted to the carbon canister 23, so as to form a conventional pressure relief air flow 501 as shown in fig. 4.
When the pressure in the oil tank 22 is relieved, the pressure difference between the pressure at the oil tank end and the pressure of the carbon canister is reduced to be not more than the threshold value of the set relief pressure. At this time, the pressure difference can not overcome the compression spring force of the pressure relief return spring 52 towards the first air chamber 14, and the compression spring force of the pressure relief return spring 52 can push the pressure relief valve head 51 to move upwards, so as to close the pressure relief channel 44 to block the air guide channel 43. The first air chamber 14 and the second air chamber 17 are completely separated again, and the pressure relief work of the oil tank is completed.
Referring to fig. 1, fig. 2 and fig. 5, the working procedure of implementing the air make-up by the tank isolation valve in the first embodiment is as follows:
when the pressure of the canister 23 is greater than the pressure of the oil tank 22, if the pressure difference between the two exceeds the preset charging pressure threshold, the pressure difference can overcome the spring force of the charging return spring 41 toward the second air chamber 17 and push the whole valve head assembly 40 to move toward the first air chamber 14 to open the first opening 15. Thereby, the first air chamber 14 and the second air chamber 17 are communicated. Thus, the gas at the end of the canister 23 sequentially passes through the inner cavity of the canister pipe joint 21, the third air chamber 18, the second air chamber 17, the first air chamber 14 and the inner cavity of the tank pipe joint 20 to form the make-up air flow 502, and finally enters the oil tank 22.
The pressure in the oil tank is supplemented with air for a period of time, and when the pressure difference between the pressure at one end of the carbon tank pipeline joint 21 and the gas pressure at one end of the oil tank pipeline joint 20 cannot overcome the spring force of the air supplementing return spring 41 towards the second air chamber 17, the air supplementing return spring 41 drives the valve head assembly 40 to move downwards and block the first opening 15. At this time, the first air chamber 14 and the second air chamber 17 are completely separated again, and the air replenishing operation of the oil tank 22 is completed.
Referring to fig. 1, 2 and 6, the tank isolating valve in the first embodiment implements the oiling condition, and the steps are as follows:
by energizing the solenoid assembly 30, the magnetic field generated by the solenoid assembly 30 will attract the valve head assembly 40 through the magnetic circuit to overcome the compression spring force of the air make-up return spring 41 and move upward to open the first opening 15, thereby communicating the first air chamber 14 with the second air chamber 17.
The gas in the oil tank 22 sequentially passes through the inner cavity of the oil tank pipeline joint 20, the first air chamber 14, the second air chamber 17, the third air chamber 18 and the inner cavity of the carbon tank pipeline joint 21 to form oil filling and pressure relief airflow 503 as shown in fig. 6, and finally enters the carbon tank 23. When an ECU (electronic control unit, also called as a driving computer or a vehicle-mounted computer) detects that the pressure in an oil tank is reduced to standard atmospheric pressure by identifying a pressure sensor signal on an oil filler cover, the ECU can control the opening of the oil filler cover to carry out oil filling operation on the automobile; when refueling is complete and the fuel filler cap is closed, the solenoid assembly 30 can be de-energized to deactivate and the solenoid assembly 30 loses adsorption force on the valve head assembly 40. The gas-supplementing return spring 41 pushes the valve head assembly 40 towards the first opening 15 and enables the valve head assembly 40 to block the first opening 15, the first air chamber 14 and the second air chamber 17 are completely separated again, and the oil-adding work is finished.
In another refueling situation, similar to fig. 6, the gas in the oil tank 22 passes through the inner cavity of the tank pipe joint 20, the first air chamber 14, the second air chamber 17 and acts on the flow restriction valve 53 in sequence, and the difference from fig. 6 is that if the force acting on the flow restriction valve 53 towards the third air chamber 18 is larger than the force acting on the flow restriction valve 53 towards the first opening 15 by the pressure relief return spring 52, the flow restriction valve 53 moves towards the second opening 16 and blocks the second opening 16, and at the moment, the gas flow can only flow to the third air chamber 18 and the carbon tank 23 through the flow restriction hole 54 on the flow restriction valve 53, so that controlled pressure relief gas flow is formed. The flow restriction orifice 54 restricts the flow of air and avoids the problem of blockage of other components of the tank system, such as the FLVV (fill limit vent valve), due to the explosive outflow of high pressure from the tank 22. When the air pressure in the oil tank 22 is reduced to a limit value, the pressure relief return spring 52 pushes the flow limiting valve 53 upwards, so that the air flow circulates according to the conventional oil filling pressure relief air flow 503, and the pressure is relieved until the air pressure is equivalent to the external atmospheric pressure. Therefore, the gas flow during refueling and pressure relief can be limited, and high-pressure gas in the oil tank can be ensured to be quickly relieved.
Example two:
referring to fig. 1, the second embodiment provides another fuel tank isolation valve, which includes a housing 10, a fuel tank line connector 20, a canister line connector 21, a driving mechanism, a valve head assembly 40, a pressure relief valve head 51, and a pressure relief return spring 52.
The housing 10 includes an upper valve housing 11, a middle valve housing 12 and a lower valve housing 13, both ends of the middle valve housing 12 are respectively connected to the upper valve housing 11 and the lower valve housing 13, and the upper valve housing 11 and the middle valve housing 12 form a first air chamber 14.
The oil tank pipeline connects 20 well valve casing 12, the communication of oil tank pipeline connects 20 inner chamber first air chamber 14, carbon tank pipeline connects 21 connect lower valve casing 13, well valve casing 12 or lower valve casing 13 are provided with the first opening 15 that is used for communicateing first air chamber 14 and lower valve casing 13 inner chamber, lower valve casing 13 has the second opening 16 that communicates lower valve casing 13 inner chamber and carbon tank pipeline connects 21 inner chamber.
The driving mechanism is arranged in the upper valve casing 11, the valve head assembly 40 extends into the middle valve casing 12, the driving mechanism is used for driving the valve head assembly 40 to be close to or far away from the first opening 15 so as to seal or open the first opening 15, and an air guide channel 43 used for communicating the first air chamber 14 with the inner cavity of the lower valve casing 13 is arranged on the valve head assembly 40.
The pressure relief valve head 51 and the pressure relief return spring 52 are provided in the lower valve housing 13, the pressure relief return spring 52 acts on the pressure relief valve head 51 to cause the pressure relief valve head 51 to have a tendency to close the air guide passage 43, and the gas pressure of the first gas chamber 14 acts on the pressure relief valve head 51 through the air guide passage 43 to cause the pressure relief valve head 51 to have a tendency to open the air guide passage 43.
The driving mechanism may be the solenoid assembly 30 shown in fig. 1, or may be another type of driving mechanism, for example, the driving mechanism may be a stepping motor, or may be another motor capable of directly or indirectly converting its own motion into a linear motion of a component driven by the stepping motor. The driving mechanism can drive the valve head assembly 40 by arranging a moving screw rod with the upper end connected with a motor, the lower end of the moving screw rod is connected with the valve head assembly 40, the motor drives the moving screw rod to do linear motion and rotary motion, and the moving screw rod drives the valve head assembly 40 to do linear motion. The motion screw rod can include screw rod body, direction support and isolation sealed pad, and the direction support moves and keeps apart along with the screw rod body casing 10 inner chamber and last casing 10 down, and the isolation sealed pad sets up between direction support and motor, and the inner edge of isolation sealed pad is fixed on the screw rod body, and the outer fringe shutoff of isolation sealed pad goes up casing 10, motor and the cooperation clearance between the support with the space between isolation sealed pad and the direction support and the space between isolation sealed pad and the motor.
The valve head assembly 40 can be driven to close or open the first opening 15 through a driving mechanism arranged in the upper valve shell 11, so that the oil tank isolation valve can realize oil filling; the pressure relief valve head 51 can block or open the air guide channel 43 through the change of the pressure difference between the oil tank 22 and the carbon tank 23 and the action of the pressure relief return spring 52, so that the oil tank isolation valve realizes pressure relief.
Therefore, the pressure relief return spring 52 is arranged in the lower valve shell 13, the pressure relief return spring 52 acts on the pressure relief valve head 51 to enable the pressure relief valve head 51 to be capable of plugging or opening the air guide channel 43, the pressure relief return spring 52 which is limited and positioned on the valve head assembly 40 does not need to be arranged independently, and the oil tank isolation valve can achieve the pressure relief function. Since the pressure relief return spring 52 is provided in the lower valve housing 13, it has a simple structure and few pressure relief process control points, so that it has an effect of simplifying the structural design.
In specific implementation, the oil tank isolation valve may further include a flow limiting valve 53, the flow limiting valve 53 is disposed in the lower valve housing 13 and divides an inner cavity of the lower valve housing 13 into a second air chamber 17 and a third air chamber 18, the second air chamber 17 communicates with the first opening 15, the third air chamber 18 communicates with an inner cavity of the canister pipe joint 21 through the second opening 16, a flow limiting hole 54 penetrating through the opposite upper surface and lower surface is disposed on the flow limiting valve 53, the pressure relief return spring 52 acts on the flow limiting valve 53 to enable the flow limiting valve 53 to have a tendency of opening the second opening 16, and the gas pressure of the second air chamber 17 acts on the flow limiting valve 53 to enable the flow limiting valve 53 to have a tendency of blocking the second opening 16. Specifically, two ends of the pressure relief return spring 52 are respectively fixed at the second opening 16 and the lower surface of the flow limiting valve 53, and the pressure relief valve head 51 is arranged on the upper surface of the flow limiting valve 53.
Therefore, the flow limiting valve 53 can block or open the second opening 16 under the action of the gas pressure of the second air chamber 17 and the pressure relief return spring 52, and can enable the air flow between the oil tank 22 and the carbon tank 23 to pass through the flow limiting hole 54 when the second opening 16 is blocked, so that the flow limiting effect of the oil tank isolating valve is realized; the pressure relief return spring 52 is reused as a return spring of the flow limiting valve 53, so that the function of returning the flow limiting valve 53 is realized, all functions of the original isolation valve can be kept, the structural design of the product is simplified, and the number and control points of the return spring are reduced.
In a specific implementation, the middle valve housing 12 or the lower valve housing 13 is further provided with a pressure relief channel 44 communicated with the air guide channel 43, and the structure and the function of the pressure relief channel 44 may be the same as those of the pressure relief channel 44 in the first embodiment, which is not described herein again.
In a specific implementation, the tank isolation valve further includes an air supply return spring 41, the air supply return spring 41 acting on the valve head assembly 40 to cause the valve head assembly 40 to have a tendency to close the first opening 15, and the gas pressure in the lower valve housing 13 acting on the valve head assembly 40 to cause the valve head assembly 40 to have a tendency to open the first opening 15. Through the change of the pressure difference between the oil tank and the carbon tank and the action of the spring force of the air-supplementing return spring 41, the valve head assembly 40 can seal or open the first opening 15, so that the oil tank isolation valve realizes air supplementation.
The valve head assembly 40 comprises a valve head base 45 and a pressure relief valve rod 42, and the air guide channel 43 is arranged on the valve head base 45. Two ends of the pressure relief valve rod 42 are respectively connected with the driving mechanism and the valve head base 45, so that the oil filling is conveniently carried out by controlling the gas flow of the driving mechanism. The air supply return spring 41 is sleeved on the pressure relief valve rod 42, so that the volume of the valve head assembly 40 can be reduced.
The pressure relief working condition process realized by the oil tank isolation valve in the second embodiment is basically the same as that of the first embodiment, and is not described herein again. The working condition process of air supply realized by the oil tank isolating valve in the second embodiment is basically the same as the working condition process of air supply in the first embodiment, and is not described herein again.
Referring to fig. 1 and 6, the refueling condition is realized through the valve in the first embodiment, and the steps are as follows:
in order to avoid pollution and harm to the safety of a driver caused by the escape of high-pressure oil gas in the pressure oil tank, the air pressure in the oil tank can be reduced to be equal to the external atmospheric pressure, and then the oil filling work is executed. The valve head assembly 40 is electrically driven by the driving mechanism away from the first opening 15 to open the first opening 15, so as to overcome the compression spring force of the air replenishing return spring 41 and move upward to open the first opening 15, thereby communicating the first air chamber 14 with the second air chamber 17.
In actual implementation, the gas in the oil tank 22 sequentially passes through the inner cavity of the oil tank pipeline joint 20, the first air chamber 14, the second air chamber 17, the third air chamber 18 and the inner cavity of the carbon tank pipeline joint 21 to form an oil filling pressure relief air flow 503 as shown in fig. 6, and finally enters the carbon tank 23. When an ECU (electronic control unit, also called as a driving computer or a vehicle-mounted computer) detects that the pressure in an oil tank is reduced to standard atmospheric pressure by identifying a pressure sensor signal on an oil filler cover, the ECU can control the opening of the oil filler cover to carry out oil filling operation on the automobile; after the oil filling is finished and the oil filling cover is closed, the valve head assembly 40 can be driven to be close to the first opening 15 through the energization of the driving mechanism so as to block the first opening 15, the first air chamber 14 and the second air chamber 17 are completely separated again, and the oil filling work is finished.
In another refueling situation, similar to fig. 6, the gas in the tank passes through the inner cavity of the tank pipe joint 20, the first air chamber 14, the second air chamber 17 and acts on the flow restriction valve 53 in sequence, and the difference from fig. 6 is that if the force acting on the flow restriction valve 53 towards the third air chamber 18 is larger than the force acting on the flow restriction valve 53 towards the first opening 15 by the pressure relief return spring 52, the flow restriction valve 53 moves towards the second opening 16 and blocks the second opening 16, and the gas flow can only flow to the third air chamber 18 and the carbon tank 23 through the flow restriction hole 54 on the flow restriction valve 53, so that controlled pressure relief gas flow is formed. The flow restriction orifice 54 restricts the flow of air to avoid the problem of blockage of other components of the tank system, such as the FLVV (refueling limit vent valve), due to high pressure explosive outflow in the tank. When the air pressure in the oil tank is reduced to a limit value, the pressure relief return spring 52 pushes the flow limiting valve 53 upwards, so that a side wall circumferential channel between the second air chamber 17 and the third air chamber 18 is opened. And the gas in the oil tank is continuously decompressed according to the flow direction of the oiling decompression gas flow 503 until the pressure is equivalent to the external atmospheric pressure. Therefore, the gas flow during refueling and pressure relief can be limited, and high-pressure gas in the oil tank 22 can be quickly relieved.
Although embodiments of the present invention have been shown and described, it will be understood that the above embodiments are exemplary and not to be construed as limiting the present invention, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the spirit and scope of the present invention, all such changes being within the scope of the appended claims.
Claims (10)
1. A tank isolation valve, comprising:
the air-conditioning valve comprises a shell, a valve body and a valve body, wherein the shell comprises an upper valve shell, a middle valve shell and a lower valve shell, two ends of the middle valve shell are respectively connected with the upper valve shell and the lower valve shell, and the upper valve shell and the middle valve shell form a first air chamber;
the fuel tank pipeline joint is connected with the middle valve shell, the inner cavity of the fuel tank pipeline joint is communicated with the first air chamber, the carbon tank pipeline joint is connected with the lower valve shell, the middle valve shell or the lower valve shell is provided with a first opening for communicating the first air chamber with the inner cavity of the lower valve shell, and the lower valve shell is provided with a second opening for communicating the inner cavity of the lower valve shell with the inner cavity of the carbon tank pipeline joint;
the solenoid assembly is arranged in the upper valve shell, the valve head assembly extends into the middle valve shell, the solenoid assembly is used for driving the valve head assembly to be close to or far away from the first opening so as to seal or open the first opening, gas pressure in the lower valve shell acts on the valve head assembly so that the valve head assembly has a tendency of opening the first opening, the air replenishing return spring acts on the valve head assembly so that the valve head assembly has a tendency of sealing the first opening, and an air guide channel for communicating the first air chamber with an inner cavity of the lower valve shell is arranged on the valve head assembly;
pressure release valve head and pressure release reset spring, pressure release valve head and pressure release reset spring set up in the lower valve casing, pressure release reset spring is used in order to make the pressure release valve head have the trend of shutoff air guide channel on the pressure release valve head, the gas pressure of first air chamber passes through the air guide channel and is used in order to make the pressure release valve head have the trend of opening the air guide channel on the pressure release valve head.
2. The fuel tank isolation valve according to claim 1, further comprising a flow restriction valve disposed in the lower valve housing and dividing the lower valve housing inner cavity into a second air chamber and a third air chamber, the second air chamber communicating with the first opening, the third air chamber communicating with the canister line connector inner cavity through the second opening, the flow restriction valve being provided with a flow restriction hole penetrating through opposite upper and lower surfaces, the pressure relief return spring acting on the flow restriction valve to cause the flow restriction valve to have a tendency to open the second opening, the gas pressure of the second air chamber acting on the flow restriction valve to cause the flow restriction valve to have a tendency to close the second opening.
3. The oil tank isolation valve according to claim 2, wherein two ends of the pressure relief return spring are respectively fixed at the second opening and the lower surface of the flow limiting valve, and the pressure relief valve head is arranged on the upper surface of the flow limiting valve.
4. The fuel tank isolating valve of claim 1, wherein the middle valve casing or the lower valve casing is further provided with a pressure relief channel communicated with the air guide channel, the pressure relief channel is arranged at the first opening, and the pressure relief valve head blocks or opens the pressure relief channel to block or open the air guide channel.
5. The oil tank isolating valve of claim 1, wherein the valve head assembly comprises a valve head base and a pressure relief valve rod, the air guide channel is arranged on the valve head base, two ends of the pressure relief valve rod are respectively connected with the electromagnetic coil assembly and the valve head base, and the air supply return spring is sleeved on the pressure relief valve rod.
6. A tank isolation valve, comprising:
the air-conditioning valve comprises a shell, a valve body and a valve body, wherein the shell comprises an upper valve shell, a middle valve shell and a lower valve shell, two ends of the middle valve shell are respectively connected with the upper valve shell and the lower valve shell, and the upper valve shell and the middle valve shell form a first air chamber;
the fuel tank pipeline joint is connected with the middle valve shell, the inner cavity of the fuel tank pipeline joint is communicated with the first air chamber, the carbon tank pipeline joint is connected with the lower valve shell, the middle valve shell or the lower valve shell is provided with a first opening for communicating the first air chamber with the inner cavity of the lower valve shell, and the lower valve shell is provided with a second opening for communicating the inner cavity of the lower valve shell with the inner cavity of the carbon tank pipeline joint;
the driving mechanism is arranged in the upper valve shell, the valve head assembly extends into the middle valve shell, the driving mechanism is used for driving the valve head assembly to be close to or far away from the first opening so as to seal or open the first opening, and an air guide channel used for communicating the first air chamber with an inner cavity of the lower valve shell is arranged on the valve head assembly;
pressure release valve head and pressure release reset spring, pressure release valve head and pressure release reset spring set up in the lower valve casing, pressure release reset spring is used in order to make the pressure release valve head have the trend of shutoff air guide channel on the pressure release valve head, the gas pressure of first air chamber passes through the air guide channel and is used in order to make the pressure release valve head have the trend of opening the air guide channel on the pressure release valve head.
7. The fuel tank isolation valve according to claim 6, further comprising a flow restriction valve disposed in the lower valve housing and dividing the lower valve housing inner cavity into a second air chamber and a third air chamber, the second air chamber communicating with the first opening, the third air chamber communicating with the canister line connector inner cavity through the second opening, the flow restriction valve being provided with a flow restriction hole penetrating through opposite upper and lower surfaces, the pressure relief return spring acting on the flow restriction valve to cause the flow restriction valve to have a tendency to open the second opening, the gas pressure of the second air chamber acting on the flow restriction valve to cause the flow restriction valve to have a tendency to close the second opening.
8. The oil tank isolation valve according to claim 7, wherein two ends of the pressure relief return spring are respectively fixed at the second opening and the lower surface of the flow limiting valve, and the pressure relief valve head is arranged on the upper surface of the flow limiting valve.
9. The fuel tank isolating valve of claim 6, wherein the middle valve casing or the lower valve casing is further provided with a pressure relief channel communicated with the air guide channel, the pressure relief channel is arranged at the first opening, and the pressure relief valve head blocks or opens the pressure relief channel to block or open the air guide channel.
10. The tank isolation valve of claim 6 further comprising an air replenishment return spring acting on said valve head assembly to cause the valve head assembly to have a tendency to close off the first opening, the gas pressure within said lower valve housing acting on said valve head assembly to cause the valve head assembly to have a tendency to open the first opening;
the valve head assembly comprises a valve head base and a pressure relief valve rod, the air guide channel is arranged on the valve head base, the two ends of the pressure relief valve rod are respectively connected with the driving mechanism and the valve head base, and the air supply reset spring is sleeved on the pressure relief valve rod.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111210884.XA CN114087371B (en) | 2021-10-18 | 2021-10-18 | Oil tank isolating valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111210884.XA CN114087371B (en) | 2021-10-18 | 2021-10-18 | Oil tank isolating valve |
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| CN114087371A true CN114087371A (en) | 2022-02-25 |
| CN114087371B CN114087371B (en) | 2022-09-27 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN118274142A (en) * | 2024-06-03 | 2024-07-02 | 苏州恩都法汽车系统股份有限公司 | Oil tank isolation valve and opening and closing method |
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| US20150059711A1 (en) * | 2013-09-03 | 2015-03-05 | Denso Corporation | Flow control valve and vapor fuel processing apparatus having the same |
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| CN114087371B (en) | 2022-09-27 |
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Address after: 215000 unit a, 1st floor, No.6 factory building, Xinxing Industrial Square, 78 Xinglin street, Suzhou Industrial Park, Jiangsu Province Patentee after: Suzhou Endofa Automotive Systems Co.,Ltd. Address before: 215000 unit a, 1st floor, No.6 factory building, Xinxing Industrial Square, 78 Xinglin street, Suzhou Industrial Park, Jiangsu Province Patentee before: SUZHOU ENDUFA AUTOMOBILE SYSTEM CO.,LTD. |