An adjustable pressure relief valve structure and its oil tank isolation valve

Abstract

The present invention discloses an adjustable pressure relief valve structure and its oil tank isolation valve, the adjustable pressure relief valve structure includes a main valve, a pressure relief valve core, a pressure relief spring and a fixed seat; the main valve is provided with a pressure relief chamber; the pressure relief valve core is installed in the pressure relief chamber through the pressure relief spring; the fixed seat is installed at the top of the pressure relief chamber; the top of the pressure relief spring is against the fixed seat; the fixed seat is provided with an internal thread, the main valve is provided with an external thread, the fixed seat and the main valve are matched at the top of the pressure relief chamber with adjustable height through thread matching, and an anti-rotation structure is also provided between the fixed seat and the main valve. The present invention allows the pressure value of the pressure relief of the oil tank isolation valve to be adjusted, and when the required value changes, it can be adjusted conveniently and quickly, and has the characteristics of simple structure, reduced manufacturing difficulty, and reduced manufacturing cost.

Description

Technical Field

[0001] The invention relates to the technical field of isolation valves, and in particular to an adjustable pressure relief valve structure and an oil tank isolation valve thereof. Background Art

[0002] In plug-in hybrid vehicles, in order to meet the increasingly stringent national emission standards, the fuel tank system is usually equipped with a fuel tank isolation valve, which has become a standard feature to reduce oil and gas evaporation / leakage. The role of the fuel tank isolation valve is to relieve pressure and intake air under high pressure and negative pressure conditions to ensure that the fuel tank structure is within the pressure range, thereby protecting the fuel tank.

[0003] The fuel tank isolation valve in the prior art usually includes a pressure relief valve structure. The pressure relief valve structure is to install the pressure relief valve core in the main valve through the pressure relief spring to open or close the pressure relief channel in the main valve. When the steam pressure in the fuel tank is greater than the elastic force of the pressure relief spring, the pressure relief valve core is pushed open by the air pressure in the fuel tank, and the pressure relief hole of the main valve is opened to allow the high-pressure fuel vapor to be discharged into the carbon canister. When the steam pressure in the fuel tank drops to less than the elastic force of the pressure relief spring, the pressure relief spring presses the pressure relief valve core to the pressure relief hole of the main valve to close the pressure relief channel. In the pressure relief valve structure of the prior art, the pressure value of the pressure relief is fixed. In terms of application, if the pressure of the fuel tank changes, it is not conducive to quickly adjusting the fuel tank isolation valve protection structure. In terms of production, on the one hand, the pressure relief spring needs to strictly control the tolerance offset, which will result in relatively high manufacturing costs for rigorous automotive electrical appliances. On the other hand, when the demand value changes, the spring and fixed structure need to be replaced, which is not conducive to the re-development of derivative products. In addition, since the offset tolerance involves parts and assembly, the control factors increase, which is not conducive to rapid manufacturing during the product production process. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an adjustable pressure relief valve structure and an oil tank isolation valve thereof. Through structural improvement, the pressure value of the pressure relief of the oil tank isolation valve can be adjusted. When the required value changes, it can be adjusted conveniently and quickly. It also has the characteristics of simple structure, reduced manufacturing difficulty and reduced manufacturing cost.

[0005] The technical solution adopted by the present invention to solve its technical problems is: an adjustable pressure relief valve structure, including a main valve, a pressure relief valve core, a pressure relief spring and a fixed seat; the main valve is provided with a pressure relief chamber; the fixed seat is installed at the top of the pressure relief chamber, and the pressure relief valve core is installed in the pressure relief chamber through the pressure relief spring; the bottom end of the pressure relief spring is against the pressure relief valve core, and the top end of the pressure relief spring is against the fixed seat; the fixed seat is provided with an internal thread, and the main valve is provided with an external thread, and the fixed seat and the main valve are adjusted to fit at the top of the pressure relief chamber through threaded fitting, and an anti-rotation structure is also provided between the fixed seat and the main valve, so as to utilize the anti-rotation structure to realize the anti-retreat of the fixed seat and utilize the height adjustment of the fixed seat to adjust the compression degree of the pressure relief spring, thereby realizing the pressure relief pressure adjustment by adjusting the elastic force of the pressure relief spring.

[0006] The main valve is also provided with a pressure relief port connected to the pressure relief chamber; the pressure relief port is arranged at the bottom of the pressure relief chamber, and the pressure relief valve core is installed in the pressure relief chamber through the pressure relief spring and corresponds to the position of the pressure relief port.

[0007] The main valve is provided with a concave cavity with an opening facing upward, and a convex column is provided in the concave cavity from the bottom wall upward, the convex column and the cavity wall of the concave cavity form the pressure relief cavity, the pressure relief port is located in the bottom wall next to the convex column, the pressure relief valve core is sleeved on the convex column and corresponds to the position of the pressure relief port; the external thread is provided at the top of the convex column, the internal thread is provided at the through hole in the middle of the fixing seat, and the fixing seat is fixed to the top of the convex column by threaded fitting.

[0008] The anti-rotation structure is a concave-convex structure arranged between the periphery of the fixing seat and the top of the cavity wall of the concave cavity of the main valve.

[0009] The concave-convex structure comprises a plurality of evenly distributed convex portions arranged around the fixed seat and a plurality of evenly distributed concave portions arranged on the top of the cavity wall of the concave cavity of the main valve. When the plurality of convex portions of the fixed seat are slightly interference fit in the corresponding concave portions of the main valve, the fixed seat and the main valve can be prevented from returning after being screwed together.

[0010] The protruding shape of the convex portion of the fixing seat is an arc shape, and the concave shape of the groove of the cavity wall of the concave cavity of the main valve is an arc shape.

[0011] The top end of the cavity wall of the concave cavity of the main valve is also provided with a plurality of protruding blocks upwards, and the grooves extend upwards into the corresponding protruding blocks.

[0012] The number of the grooves is greater than or equal to the number of the protrusions.

[0013] The number of the grooves is an integral multiple of the number of the protrusions.

[0014] The fixing seat is provided with a socket portion for socketing the pressure relief spring, and the outside of the socket portion is provided with a convex hole for fixing the pressure relief spring, the boss is provided with a center hole running through the upper and lower ends, and a notch or an opening is provided in the hole wall of the center hole of the boss at a position corresponding to the threaded segment to connect the center hole with the pressure relief chamber; in the center hole of the boss, a connecting piece is also connected between the hole walls of the threaded segments separated by the notch or the opening.

[0015] An oil tank isolation valve comprises the above-mentioned adjustable pressure relief valve structure.

[0016] Compared with the prior art, the beneficial effects of the present invention are:

[0017] 1. The present invention adopts an internal thread provided on the fixed seat and an external thread provided on the main valve. The fixed seat and the main valve are matched at the top of the pressure relief chamber through threaded matching to adjust the height. An anti-rotation structure is also provided between the fixed seat and the main valve, so as to realize the anti-retraction of the fixed seat by utilizing the anti-rotation structure and adjust the compression degree of the pressure relief spring by adjusting the height position of the fixed seat, thereby realizing the pressure relief pressure adjustment by adjusting the elastic force of the pressure relief spring. With this structure of the present invention, the fixed seat can move up and down through the thread, and then adjust the height (i.e., the compression degree) of the compression spring according to the thread torsion, thereby adjusting the elastic force value of the compression spring; so that the pressure value of the pressure relief of the oil tank isolation valve can be adjusted, and when the required value changes, it can be adjusted conveniently and quickly, and has the characteristics of simple structure, reduced manufacturing difficulty, and reduced manufacturing cost.

[0018] 2. The present invention adopts the anti-rotation structure as a plurality of evenly distributed protrusions around the periphery of the fixed seat and a plurality of evenly distributed grooves on the top of the cavity wall of the concave cavity of the main valve. When the plurality of protrusions of the fixed seat are slightly interference fit in the corresponding grooves of the main valve, the return of the fixed seat and the main valve after the screw connection can be prevented. This structure of the present invention is to design the protrusion of the fixed seat and the groove of the main valve to be slightly interference fit, so that it can ensure that the fixed seat can be installed in the top of the pressure relief cavity of the main valve, and prevent the thread from returning, so as to ensure that the fixed seat is in the adjusted high and low position, so as to adjust the compression degree of the pressure relief spring by adjusting the height position of the fixed seat.

[0019] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments; however, the adjustable pressure relief valve structure and the oil tank isolation valve thereof of the present invention are not limited to the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic diagram of the structural decomposition of an adjustable pressure relief valve structure according to an embodiment of the present invention;

[0021] Figure 2is a top view of an adjustable pressure relief valve structure of an embodiment of the present invention;

[0022] Figure 3 is along Figure 2 The cross-sectional view of line AA in the figure;

[0023] Figure 4 is along Figure 2 The cross-sectional view of line BB in FIG.

[0024] Figure 5 is along Figure 2 Cross-sectional view of line CC in;

[0025] Figure 6 is along Figure 2 A three-dimensional structural cross-sectional view of the DD line;

[0026] Figure 7 Schematic diagram of the coordination of the pressure relief valve core, the pressure relief spring and the fixing seat of the adjustable pressure relief valve structure of the embodiment of the present invention;

[0027] Figure 8 It is a top view of the matching pressure relief valve core, pressure relief spring and fixing seat of the adjustable pressure relief valve structure of the embodiment of the present invention;

[0028] Fig. 9 is along Figure 8 A cross-sectional view of line EE in FIG.

[0029] Fig.10 is along Figure 8 A cross-sectional view of line FF in FIG.

[0030] Fig.11 is along Figure 8 A cross-sectional view of the GG line in FIG.

[0031] Fig.12 is along Figure 8 A three-dimensional structural cross-sectional view of the HH line;

[0032] Fig.13 is a structural schematic diagram of a main valve of an adjustable pressure relief valve structure according to an embodiment of the present invention;

[0033] Fig.14 is a top view of a main valve of an adjustable pressure relief valve structure according to an embodiment of the present invention;

[0034] Fig.15 is along Fig.14 A cross-sectional view of line II in FIG.

[0035] Fig.16 is along Fig.14 A cross-sectional view of the JJ line in FIG.

[0036] Fig.17is along Fig.14 The cross-sectional view of the KK line in FIG.

[0037] Fig.18 is along Fig.14 The three-dimensional structure cross-sectional view of the LL line;

[0038] Fig.19 It is a schematic structural diagram of a fuel tank isolation valve according to an embodiment of the present invention. DETAILED DESCRIPTION

[0039] Example

[0040] See also Figures 1 to 18 As shown, an adjustable pressure relief valve structure of the present invention comprises a main valve 1, a pressure relief valve core 2, a pressure relief spring 3 and a fixed seat 4; the main valve 1 is provided with a pressure relief port 11 and a pressure relief cavity 12 connected to the pressure relief port; the pressure relief port 11 is provided at the bottom of the pressure relief cavity 12, the fixed seat 4 is installed at the top of the pressure relief cavity 12, the pressure relief valve core 2 is installed in the pressure relief cavity 12 through the pressure relief spring 3 and corresponds to the position of the pressure relief port 11; the bottom end of the pressure relief spring 3 abuts against the pressure relief valve core 2, and the pressure relief The top end of the spring 3 is against the fixed seat 4; the fixed seat 4 is provided with an internal thread 41, and the main valve 1 is provided with an external thread 13. The fixed seat 4 and the main valve 1 are height-adjustably matched at the top of the pressure relief chamber 12 through threaded matching. An anti-rotation structure is also provided between the fixed seat 4 and the main valve 1, so as to utilize the anti-rotation structure to realize the anti-retraction of the fixed seat 4 and utilize the height adjustment of the fixed seat 4 to adjust the compression degree of the pressure relief spring 3, thereby realizing the pressure relief pressure adjustment by adjusting the elastic force of the pressure relief spring 3.

[0041] In this embodiment, the main valve 1 is provided with a concave cavity 14 with an opening facing upward, and a convex column 16 is provided upward from the bottom wall 15 in the concave cavity, and the convex column 16 and the cavity wall 17 of the concave cavity 14 surround the pressure relief cavity 12, and the pressure relief port 11 is located in the bottom wall 15 next to the convex column 16, and a through hole 21 is provided in the middle of the pressure relief valve core 2, and the pressure relief valve core 2 is sleeved on the convex column 16 by using the through hole 21 and corresponds to the position of the pressure relief port 11; the external thread 13 is provided at the top of the convex column 16, and the internal thread 41 is provided at the through hole 42 in the middle of the fixing seat 4, and the fixing seat 4 is fixed to the top of the convex column 16 by threaded fitting.

[0042] In this embodiment, the anti-rotation structure is a concave-convex structure provided between the periphery of the fixing seat 4 and the top of the cavity wall 17 of the concave cavity 14 of the main valve 1 .

[0043] In this embodiment, the concave-convex structure is a plurality of evenly distributed protrusions 43 arranged on the periphery of the fixed seat 4 and a plurality of evenly distributed grooves 18 on the top of the cavity wall 17 of the concave cavity 14 of the main valve 1. When the plurality of protrusions 43 of the fixed seat 4 are respectively slightly interference fit in the corresponding grooves 18 of the main valve 1, the fixed seat 4 and the main valve 1 can be prevented from retreating after being screwed together.

[0044] In this embodiment, the protruding shape of the protrusion 43 of the fixing seat 4 is an arc shape, and the concave shape of the groove 18 of the cavity wall 17 of the concave cavity 14 of the main valve 1 is an arc shape.

[0045] In this embodiment, a plurality of protruding blocks 19 are further provided upwardly at the top of the cavity wall 17 of the concave cavity 14 of the main valve 1 , and the grooves 18 extend upwardly into the corresponding protruding blocks 19 .

[0046] In this embodiment, the number of the grooves 18 is greater than or equal to the number of the protrusions 43 .

[0047] In this embodiment, the number of the grooves 18 is twice the number of the protrusions 43 . In this embodiment, there are eight grooves 18 and four protrusions 43 .

[0048] In this embodiment, the fixing seat 4 is provided with a socket portion 44 for socketing the pressure relief spring, and the outside of the socket portion 44 is provided with a convex hole 45 for fixing the pressure relief spring 3. The boss 16 of the main valve 1 is provided with a center hole 161 passing through the upper and lower ends, and a notch or opening is provided in the hole wall of the center hole 161 of the boss 16 at a position corresponding to the threaded section to connect the center hole with the pressure relief chamber. In this embodiment, two notches 162 are provided; in the center hole 161 of the boss, a connecting piece 163 is also connected between the hole walls of the threaded sections separated by the two notches 162. Since the fixing seat 4 is provided with a plurality of convex ribs 45 for fixing the pressure relief spring 3, the gaps between the convex ribs 45 may easily lead to excessive airflow pressure (i.e., flow resistance) causing thread retreat; in order to disperse or transfer the flow resistance on the fixing seat 4, the present invention provides a notch or opening in the hole wall of the central hole 161 of the boss 16 at the position corresponding to the threaded section to connect the central hole 161 of the main valve 1 with the pressure relief chamber 12, so that the oil and gas can quickly pass through the central hole 161 of the main valve 1, thereby reducing the flow resistance of the channel as a whole. At the same time, since the notch or opening of the threaded section will make it impossible to install the fixing seat 4, the present invention provides a connecting piece 163 in the middle of the main valve to connect the two threaded sections to strengthen the structure at the threaded rod.

[0049] See also Figures 1 to 19As shown, a fuel tank isolation valve of the present invention comprises a valve body 5, an electromagnet 6 and the above-mentioned adjustable pressure relief valve structure; the valve body 5 is provided with a accommodating chamber 51, the main valve 1 is installed in the accommodating chamber 51 of the valve body 5 through the main spring 7, the valve body 5 is also provided with a first channel 52 for connecting the fuel tank and a second channel 53 for connecting the carbon canister; and the first channel 52 and the second channel 53 are isolated by the main valve 1, the first channel 52 is also connected to the pressure relief port 11, the pressure relief port 11 is closed by the pressure relief valve core 2, which is equivalent to a one-way valve here, when the pressure of the fuel tank is high, the pressure relief valve core 2 is pushed open, the pressure relief port 11 is opened, the fuel tank is connected to the pressure relief chamber 12, the pressure relief chamber 12 is connected to the second channel 53, the second channel 53 is also connected to one end of the center hole 161 of the main valve 1, and the other end of the center hole 161 cooperates with the moving iron core assembly in the electromagnet 6.

[0050] By rotating the fixing seat 4, the degree of compression of the fixing seat 4 on the pressure relief spring 3 can be adjusted, that is, the compression height of the pressure relief spring can be adjusted, thereby adjusting the elastic force of the compression spring; when the elastic force value increases, because the force area of ​​the pressure relief valve core 2 is fixed, the increased compression elastic force value requires a larger gas pressure to push open the pressure relief valve core 2 to form a pressure relief effect, and the gas pressure is connected to the oil tank, thereby ensuring that the oil tank has a higher gas pressure usage value; when the elastic force value decreases, because the force area of ​​the pressure relief valve core 2 is fixed, the reduced compression elastic force value requires less gas pressure to push open, and because the gas pressure that can be tolerated is small, only a smaller gas pressure is needed to form a pressure relief effect, thereby ensuring the pressure stability of the oil tank, and when the pressure rises, the pressure relief valve core 2 is opened, and the gas is depressurized, thereby ensuring that the oil tank is not damaged by pressure.

[0051] An adjustable pressure relief valve structure and its oil tank isolation valve of the present invention adopt an internal thread 41 provided on the fixed seat 4, an external thread 13 provided on the main valve 1, the fixed seat 4 and the main valve 1 are matched at the top of the pressure relief chamber 12 by threaded matching, and an anti-rotation structure is also provided between the fixed seat 4 and the main valve 1, so as to realize the anti-retraction of the fixed seat 4 by utilizing the anti-rotation structure and adjust the compression degree of the pressure relief spring 3 by adjusting the height position of the fixed seat 4, so as to realize the pressure relief pressure adjustment by adjusting the elastic force of the pressure relief spring 3. In this structure of the present invention, the fixed seat 4 can move up and down by the thread, and then adjust the height (i.e., the compression degree) of the compression spring according to the thread torsion, so as to adjust the elastic force value of the compression spring; so that the pressure value of the pressure relief of the oil tank isolation valve can be adjusted, and when the required value changes, it can be adjusted conveniently and quickly, and has the characteristics of simple structure, reduced manufacturing difficulty, and reduced manufacturing cost.

[0052] The adjustable pressure relief valve structure and the oil tank isolation valve thereof of the present invention adopt a plurality of evenly distributed protrusions 43 around the fixed seat 4 and a plurality of evenly distributed grooves 18 on the top of the cavity wall of the concave cavity of the main valve 1, and the anti-rotation structure is set as a plurality of evenly distributed protrusions 43 on the periphery of the fixed seat 4 and a plurality of evenly distributed grooves 18 on the top of the cavity wall of the concave cavity of the main valve 1. When the plurality of protrusions 43 of the fixed seat 4 are respectively slightly interference fit in the corresponding grooves 18 of the main valve 1, the return of the fixed seat 4 and the main valve 1 after the screw connection can be prevented. This structure of the present invention is to design the protrusions 43 of the fixed seat and the grooves 18 of the main valve 1 to be slightly interference fit, so that the fixed seat 4 can be installed in the top of the pressure relief cavity of the main valve 1, and the thread can be prevented from returning, so that the fixed seat 4 is in the adjusted high and low position, so as to adjust the compression degree of the pressure relief spring by adjusting the height position of the fixed seat.

[0053] The above is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technician familiar with the art can make many possible changes and modifications to the technical solution of the present invention by using the technical content disclosed above, or modify it into an equivalent equivalent embodiment without departing from the scope of the technical solution of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention should fall within the scope of protection of the technical solution of the present invention.

Claims

1. An adjustable pressure relief valve structure, comprising a main valve, a pressure relief valve core, a pressure relief spring and a fixed seat; the main valve is provided with a pressure relief chamber; the fixed seat is mounted on the top of the pressure relief chamber, and the pressure relief valve core is mounted in the pressure relief chamber through the pressure relief spring; the bottom end of the pressure relief spring abuts against the pressure relief valve core, and the top end of the pressure relief spring abuts against the fixed seat; characterized in that: The fixing seat is provided with an internal thread, and the main valve is provided with an external thread. The fixing seat and the main valve can be adjusted in height to fit at the top of the pressure relief chamber through threaded cooperation. An anti-rotation structure is also provided between the fixing seat and the main valve, so as to utilize the anti-rotation structure to realize the anti-retraction of the fixing seat and utilize the height adjustment of the fixing seat to adjust the compression degree of the pressure relief spring, thereby realizing the pressure relief pressure adjustment by adjusting the elastic force of the pressure relief spring; the main valve is provided with a concave cavity with an opening facing upward; the anti-rotation structure is a concave-convex structure arranged between the periphery of the fixing seat and the top of the cavity wall of the concave cavity of the main valve; the concave-convex structure is a plurality of convex parts evenly distributed on the periphery of the fixing seat and a plurality of grooves evenly distributed on the top of the cavity wall of the concave cavity of the main valve. When the plurality of convex parts of the fixing seat are respectively slightly interference-fitted in the corresponding grooves of the main valve, the retraction of the fixing seat and the main valve after the screw connection can be prevented.

2. The adjustable pressure relief valve structure according to claim 1, characterized in that: The main valve is also provided with a pressure relief port connected to the pressure relief chamber; the pressure relief port is arranged at the bottom of the pressure relief chamber, and the pressure relief valve core is installed in the pressure relief chamber through the pressure relief spring and corresponds to the position of the pressure relief port.

3. The adjustable pressure relief valve structure according to claim 2, characterized in that: A convex column is provided in the concave cavity from the bottom wall upwards, the convex column and the cavity wall of the concave cavity form the pressure relief cavity, the pressure relief port is located in the bottom wall next to the convex column, the pressure relief valve core is sleeved on the convex column and corresponds to the position of the pressure relief port; the external thread is provided at the top of the convex column, the internal thread is provided at the through hole in the middle of the fixing seat, and the fixing seat is fixed to the top of the convex column by threaded fitting.

4. The adjustable pressure relief valve structure according to claim 3, characterized in that: The protruding shape of the convex portion of the fixing seat is an arc shape, and the concave shape of the groove of the cavity wall of the concave cavity of the main valve is an arc shape.

5. The adjustable pressure relief valve structure according to claim 3, characterized in that: The top end of the cavity wall of the concave cavity of the main valve is also provided with a plurality of protruding blocks upwards, and the grooves extend upwards into the corresponding protruding blocks.

6. The adjustable pressure relief valve structure according to claim 3, characterized in that: The number of the grooves is greater than or equal to the number of the protrusions.

7. The adjustable pressure relief valve structure according to claim 6, characterized in that: The number of the grooves is an integral multiple of the number of the protrusions.

8. The adjustable pressure relief valve structure according to claim 3, characterized in that: The fixing seat is provided with a socket portion for socketing the pressure relief spring, and the outside of the socket portion is provided with a convex hole for fixing the pressure relief spring, the boss is provided with a center hole running through the upper and lower ends, and a notch or an opening is provided in the hole wall of the center hole of the boss at a position corresponding to the threaded segment to connect the center hole with the pressure relief chamber; in the center hole of the boss, a connecting piece is also connected between the hole walls of the threaded segments separated by the notch or the opening.

9. A fuel tank isolation valve, characterized in that: The invention comprises the adjustable pressure relief valve structure as claimed in any one of claims 1 to 8.

Images