Valve element assembly, two-way valve and double-oil-tank system

Abstract

The utility model provides a valve element assembly, a two-way valve and a double-oil-tank system. The problem that under the special working condition, oil return of an oil inlet pipe of an engine causes the risk of pipeline breakage is solved. The valve element assembly comprises a first valve element and a second valve element, wherein the first valve element is provided with a first flow channel, a first containing groove located in the outer side of the first flow channel and a first oil inlet communicating with the first containing groove; the first elastic piece is arranged in the first containing groove, and a part of the first elastic piece extends out of the first containing groove so as to be used for being connected with an external structure in an abutting mode; the plug is connected with one end, far away from the notch of the first accommodating groove, of the first flow channel, and the plug is provided with a second flow channel; the second valve element is limited in the first flow channel and can move in the extending direction of the first flow channel; the second elastic piece is arranged between the plug and the second valve element, and the rigidity of the second elastic piece is larger than that of the first elastic piece.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vehicles, in particular to a valve core assembly, a bidirectional valve and a double-tank system. BACKGROUND

[0002] With the demand for long-distance driving endurance of the domestic automobile market, the volume demand of the oil tank of the whole vehicle is increasing, but due to the space limitation of the wheelbase of the whole vehicle, it is difficult to meet the volume demand of the oil tank of the whole vehicle by using a single oil tank. Therefore, using a double-tank becomes one of the effective solutions to meet the volume demand of the oil tank of the whole vehicle.

[0003] In the related art, a double-tank system connects the oil outlet pipes of two oil tanks together and then connects them to the oil inlet pipe of the engine. In order to avoid fuel mixing between the two oil tanks, a one-way valve is connected in series in the pipeline before the oil outlet pipes of the two oil tanks are connected together, so that the fuel of each oil tank can only flow into the engine oil inlet pipe in one direction.

[0004] Under certain working conditions, the fuel discharged by the high-pressure oil pump of the engine will flow back to the engine oil inlet pipe, causing the pressure in the pipeline to increase, and excessive pressure will cause the pipeline to be at risk of rupture. CONTENT OF THE INVENTION

[0005] The present application provides a valve core assembly, a bidirectional valve and a double-tank system to improve the problem of the risk of rupture of the pipeline caused by the return of oil to the engine oil inlet pipe under special working conditions.

[0006] The specific technical solutions are as follows:

[0007] In a first aspect, the present application provides a valve core assembly, comprising: a first valve core provided with a first flow channel, a first accommodating groove located outside the first flow channel, and a first oil inlet port communicated with the first accommodating groove; a first elastic member arranged in the first accommodating groove, part of the first elastic member extending out of the first accommodating groove for abutting against an external structure; a plug connected to one end of the first flow channel away from the slot of the first accommodating groove, the plug being provided with a second flow channel; a second valve core limited in the first flow channel and movable along the extension direction of the first flow channel; and a second elastic member arranged between the plug and the second valve core, the rigidity of the second elastic member being greater than the rigidity of the first elastic member.

[0008] When the valve core assembly is applied to the dual-tank system, firstly, the fuel in each tank can flow into the engine oil inlet pipe in the forward direction through the valve core structure composed of the first valve core and the first elastic member. Since the second elastic member has a large rigidity, the oil outlet pressure of the two tanks will not be greater than the opening pressure of the second valve core, and the fuel of one tank will not flow into the other tank through the valve core assembly, thereby improving the problem of fuel mixing between the two tanks. Secondly, under certain working conditions, the engine high-pressure oil pump will be depressurized. Since the pressure of the depressurized fuel will be greater than the opening pressure of the second valve core, the fuel in the engine oil inlet pipe can flow back to a certain tank in the reverse direction through the valve core structure composed of the plug, the second valve core and the second elastic member, thereby avoiding accumulation in the engine oil inlet pipe, and improving the problem of pipe rupture caused by increased pipe pressure. Therefore, it is beneficial to reduce the probability of fuel mixing between the two tanks and the probability of pipe rupture, thereby improving the reliability and stability of the operation of the dual-tank system.

[0009] In some embodiments, the valve core assembly further comprises a first sealing member and a second sealing member, the first flow channel is provided with a limiting portion at one end away from the plug, the second valve core abuts against the limiting portion through the first sealing member, the first valve core is provided with a first sealing groove on a side surface away from the first accommodating groove, and the second sealing member is arranged in the first sealing groove. In this way, it is beneficial to further reduce the probability of fuel mixing between the two tanks, thereby further improving the reliability and stability of the operation of the dual-tank system.

[0010] In some embodiments, the second valve core comprises a sliding portion for gap cooperation with the first flow channel, and an extension portion, the extension portion and the sliding portion jointly form a limiting shaft shoulder, the extension portion is provided with a second sealing groove, and the first sealing member is arranged in the second sealing groove and located between the limiting shaft shoulder and the limiting portion. In this way, on the one hand, it is beneficial to improve the reliability and stability of the second valve core in the first flow channel, on the other hand, it is beneficial to improve the convenience of installation of the first sealing member, in addition, it can also reduce the probability of accidental separation of the first sealing member due to frequent movement of the second valve core, thereby further improving the sealing reliability of the first sealing member.

[0011] In some embodiments, the sliding portion is provided with a second accommodating groove for accommodating the second elastic member and a plurality of second oil inlets in communication with the second accommodating groove, and the outer surface of the sliding portion is provided with a plurality of recessed planes at intervals in the circumferential direction, and the plurality of second oil inlets are respectively arranged on the plurality of planes. In this way, on the one hand, it is beneficial to improve the convenience of installation of the second elastic member, on the other hand, it is beneficial to improve the smoothness of fuel flow.

[0012] In some embodiments, the plug is provided with a third accommodating groove for accommodating the second elastic member. In this way, the second elastic member can be limited, and the convenience of installation of the second elastic member can be improved.

[0013] In some embodiments, the first valve core and the second valve core are both conductive valve cores. The first valve core and the second valve core can conduct static electricity, thereby improving the safety and reliability of the dual-tank system.

[0014] In some embodiments, the cross-sectional shape of the second flow channel is one of an ellipse, a rectangle, and a polygon. In this way, the plug can be installed on the first flow channel by means of the second flow channel, thereby improving the convenience of installation of the plug.

[0015] In some embodiments, the first oil inlet is a plurality of and is arranged at intervals along the circumferential direction of the first valve core. In this way, the flow of fuel can be smooth and efficient.

[0016] In a second aspect, the embodiments of the present application provide a bidirectional valve, which comprises a first valve body, a second valve body, and the valve core assembly as described in the first aspect. The first valve body and the second valve body are connected to form an accommodating cavity for accommodating the valve core assembly. The first valve body is provided with an oil inlet passage in communication with the accommodating cavity. The second valve body is provided with an oil return passage in communication with the accommodating cavity. The first elastic member abuts against the second valve body, so that the first valve core can be combined with or separated from the first valve body.

[0017] In this way, the probability of fuel mixing between the two tanks can be reduced, and the probability of pipeline rupture can be reduced, thereby improving the reliability and stability of the operation of the dual-tank system.

[0018] In some embodiments, the first valve core comprises a first section and a second section. The first section is located on the side of the second section away from the second valve body. The diameter of the first section is smaller than the diameter of the second section. The first oil inlet is arranged on the first section. In this way, on the one hand, the second section can guide the movement of the first valve core to avoid the first valve core from being stuck. On the other hand, the diameter of the first section is smaller, and the first oil inlet is arranged on the first section, thereby improving the efficiency and smoothness of fuel delivery.

[0019] In a third aspect, the embodiments of the present application provide a dual-oil-tank system, comprising: a three-way valve; an engine oil inlet pipe in communication with a first port of the three-way valve; a first oil tank and a second oil tank, the first oil tank being in communication with a second port of the three-way valve through a first oil pipe, and the second oil tank being in communication with a third port of the three-way valve through a second oil pipe; and the bidirectional valve as described in the second aspect, which is connected in series in the first oil pipe and / or the second oil pipe.

[0020] In this way, the probability of fuel mixing in the two oil tanks is reduced, and the probability of pipe rupture is also reduced, thereby improving the reliability and stability of the dual-oil-tank system. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 An exploded structural schematic view of the bidirectional valve provided by an embodiment of the present application is shown in FIG. 4.

[0022] Figure 2 A cross-sectional structural schematic view of the valve core assembly provided by an embodiment of the present application is shown in FIG. 5.

[0023] Figure 3 A cross-sectional structural schematic view of the bidirectional valve provided by an embodiment of the present application is shown in FIG. 6.

[0024] Figure 4 A cross-sectional structural schematic view of the bidirectional valve provided by an embodiment of the present application is shown in FIG. 7.

[0025] Figure 5 A cross-sectional structural schematic view of the bidirectional valve provided by an embodiment of the present application is shown in FIG. 8.

[0026] Figure 6 A structural schematic view of the dual-oil-tank system provided by an embodiment of the present application is shown in FIG. 9.

[0027] Figure 7 A structural schematic view of the second valve core provided by an embodiment of the present application is shown in FIG. 10.

[0028] The meanings of the reference numerals in the drawings are as follows:

[0029] 1, dual-oil-tank system; 2, three-way valve; 3, engine oil inlet pipe; 4, first oil tank; 5, second oil tank; 6, first oil pipe; 7, second oil pipe; 11, accommodating cavity; 12, oil inlet passage; 13, oil return passage; 14, third sealing member; 15, mark;

[0030] 10, bidirectional valve; 200, first valve body; 300, second valve body;

[0031] 100, valve core assembly; 110, first valve core; 111, first flow channel; 112, first accommodating groove; 1101, first oil inlet; 1111, limiting part; 1102, first sealing groove; 113, first section; 114, second section;

[0032] 120, first elastic member; 130, plug; 131, second flow channel; 132, third accommodating groove; 140, second valve core; 141, sliding part; 142, extension part; 1421, limiting shaft shoulder; 1422, second sealing groove; 1411, second accommodating groove; 1412, second oil inlet; 1413, recessed plane;

[0033] 150, second elastic member; 160, first sealing member; 170, second sealing member. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application clearer, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and not to limit the present application.

[0035] In the description of the present application, it should be understood that if the orientation or position relationship indicated by the terms "upper", "lower", "left", "right" and the like is based on the orientation or position relationship shown in the drawings, it is only for the purpose of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a particular orientation, be constructed and operated in a particular orientation, therefore the terms describing the position relationship in the drawings are only used for exemplary description, and cannot be understood as a limitation of the present application, for those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0036] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is at least two, for example, two, three, etc., unless otherwise explicitly specified.

[0037] In the description of the present application, unless specifically defined and limited otherwise, the terms "mounting", "connection", "connecting", "fixing" and the like should be broadly interpreted, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements, unless otherwise specifically limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0038] As shown in Figure 1 and Figure 2 , in a first aspect, the embodiments of the present application propose a valve core assembly 100. The valve core assembly 100 comprises a first valve core 110, a first elastic member 120, a plug 130, a second valve core 140 and a second elastic member 150. The first valve core 110 is provided with a first flow channel 111, a first accommodating groove 112 located outside the first flow channel 111, and a first oil inlet 1101 communicating with the first accommodating groove 112. The first elastic member 120 is arranged in the first accommodating groove 112, and part of the first elastic member 120 extends out of the first accommodating groove 112 for abutting with an external structure. The plug 130 is provided with a second flow channel 131, and the plug 130 is connected with one end of the first flow channel 111 away from the slot of the first accommodating groove 112. The second valve core 140 is limited in the first flow channel 111 and can move along the extension direction of the first flow channel 111, that is, there is a gap between the outer wall of the second valve core 140 and the inner wall of the first flow channel 111. The second elastic member 150 is located in the first flow channel 111 and arranged between the plug 130 and the second valve core 140. The rigidity of the second elastic member 150 is greater than the rigidity of the first elastic member 120.

[0039] The valve core assembly 100 in the present application comprises a first valve core 110, a first elastic member 120, a plug 130, a second valve core 140 and a second elastic member 150. The second valve core 140 being limited in the first flow channel 111 means that one end of the second valve core 140 away from the plug 130 is limited in cooperation with the first flow channel 111 to prevent the second valve core 140 from moving out of the first flow channel 111.

[0040] The first valve core 110 and the first elastic member 120 constitute one of the one-way flow valve core structures. Specifically, as shown in Figure 3 , when the first valve core 110 is not under pressure, the first valve core 110 can be sealingly matched with an external valve body, for example, sealingly matched with a first valve body 200. At this time, the liquid in the pipeline cannot flow to the side close to the first elastic member 120 through the outside of the first valve core 110. As shown in Figure 4As shown, when the first spool 110 is subjected to liquid pressure, the first spool 110 will move towards the side close to the first elastic member 120. At this time, the first spool 110 can be disengaged from the valve body (the first valve body 200) outside, so that the liquid in the pipeline can flow towards the side close to the first elastic member 120. That is, the first spool 110 and the first elastic member 120 together can control the flow of liquid along the first spool 110 away from the end of the first accommodating groove 112 towards the end of the first spool 110 close to the first accommodating groove 112.

[0041] The plug 130, the second spool 140 and the second elastic member 150 constitute another one-way flow spool structure, and the liquid flow direction controlled by the spool structure is opposite to the liquid flow direction controlled by the spool structure formed by the first spool 110 and the first elastic member 120. Specifically, as shown, Figure 3 As shown, when the second spool 140 is not subjected to pressure, the second spool 140 will be sealed and abutted to the end of the first flow channel 111 close to the first accommodating groove 112 due to the elastic force of the second elastic member 150. At this time, the liquid in the pipeline cannot flow through the gap between the second spool 140 and the first flow channel 111 to the second flow channel 131 of the plug 130. As shown, Figure 5 As shown, when the second spool 140 is subjected to reverse liquid pressure, the second spool 140 will move towards the side close to the plug 130. At this time, the second spool 140 can be disengaged from the end of the first flow channel 111 close to the first accommodating groove 112, so that the liquid in the pipeline can flow through the gap between the second spool 140 and the first flow channel 111 to the second flow channel 131 of the plug 130. That is, the plug 130, the second spool 140 and the second elastic member 150 together can control the flow of liquid along the first spool 110 close to the end of the first accommodating groove 112 towards the end of the first spool 110 away from the first accommodating groove 112.

[0042] The spool assembly 100 of the present application is provided with the second spool 140 in the first flow channel 111 of the first spool 110. Among them, the first spool 110 and the first elastic member 120 constitute one of the liquid one-way flow spool structures, and the liquid flow direction of the spool structure is referred to as the forward direction. The plug 130, the second spool 140 and the second elastic member 150 constitute another one-way flow spool structure, and the liquid flow direction of the spool structure is referred to as the reverse direction. Therefore, the spool assembly 100 can control the flow of the pipeline liquid in two opposite directions.

[0043] Further, the rigidity of the second elastic member 150 is greater than the rigidity of the first elastic member 120, that is, the second elastic member 150 is more difficult to be compressed, so that the opening pressure of the second spool 140 will be greater than the opening pressure of the first spool 110.

[0044] Thus, as shown in Figure 6 , when the valve core assembly 100 is applied to the dual tank system 1, first, the fuel in each tank can flow into the engine oil inlet pipe 3 in the forward direction by the valve core structure composed of the first valve core 110 and the first elastic member 120. Since the second elastic member 150 has a large rigidity, the oil outlet pressure of the two tanks will not be greater than the opening pressure of the second valve core 140, and the fuel of one tank will not flow into the other tank through the valve core assembly 100 after flowing out, thereby improving the problem of fuel mixing between the two tanks. Second, under certain working conditions, the engine high-pressure oil pump will be depressurized. Since the pressure of the depressurized fuel will be greater than the opening pressure of the second valve core 140, the fuel in the engine oil inlet pipe 3 can flow back to a certain tank in the reverse direction through the valve core structure composed of the plug 130, the second valve core 140, and the second elastic member 150, thereby avoiding accumulation in the engine oil inlet pipe 3 and improving the problem of pipe rupture caused by increased pipe pressure. Thus, it is beneficial to reduce the probability of pipe rupture while reducing the probability of fuel mixing between the two tanks, thereby improving the reliability and stability of the operation of the dual tank system 1.

[0045] In addition, the second valve core 140 is located in the first flow channel 111 inside the first valve core 110, the first valve core 110 has a large size and controls forward flow of liquid, and the second valve core 140 has a small size and controls reverse flow. When the fuel is supplied in the forward direction, the large-size first valve core 110 can provide a large flow area to reduce the resistance of the fuel during transportation and meet the fuel demand of the equipment under different working conditions. When the engine oil inlet pipe 3 flows back in the reverse direction, the small-size second valve core 140 can quickly respond to the large pressure and be opened in time to flow back the fuel in the reverse direction to the tank, thereby improving the reliability and safety of the pipeline.

[0046] Optionally, the first elastic member 120 and the second elastic member 150 can be one of a compression coil spring, a rubber spring, and an air spring, and the present application does not limit this.

[0047] In some embodiments, as shown in Figure 2 and Figure 3 , the valve core assembly 100 further includes a first sealing member 160 and a second sealing member 170, an end of the first flow channel 111 away from the plug 130 is provided with a limiting portion 1111, the second valve core 140 abuts against the limiting portion 1111 through the first sealing member 160, and a circumferential first sealing groove 1102 is arranged on a side surface of the first valve core 110 away from the first accommodating groove 112, and the second sealing member 170 is arranged in the first sealing groove 1102.

[0048] In this embodiment, the limiting portion 1111 can be, for example, a ring-shaped protrusion, a blocking table or the like structure arranged at the port of the first flow channel 111, and the first sealing member 160 and the second sealing member 170 can be sealing rings, sealing gaskets or the like sealing members.

[0049] The first sealing member 160 is located between the second spool 140 and the limiting portion 1111. When the second spool 140 is not under force, the second spool 140 will abut against the limiting portion 1111 through the first sealing member 160 under the initial force of the second elastic member 150. Thus, the sealing performance between the second spool 140 and the first flow channel 111 can be improved, and the problem of reverse flow of liquid through the second spool 140 when the second spool 140 is not opened due to poor sealing can be avoided.

[0050] Similarly, the second sealing member 170 is arranged in the first sealing groove 1102 of the first spool 110, and the second sealing member 170 can seal between the first spool 110 and the external valve body. As shown in Figure 3 When the first spool 110 is not under force, the first spool 110 will abut against the external valve body (the first valve body 200) through the second sealing member 170 under the initial force of the first elastic member 120. Thus, the sealing performance between the first spool 110 and the external valve body can be improved, and the problem of reverse flow of liquid through the first spool 110 when the second spool 140 is not opened due to poor sealing can be avoided. Thus, it is beneficial to further reduce the probability of fuel mixing between the two oil tanks, and further improve the reliability and stability of the operation of the double-oil-tank system 1.

[0051] In some embodiments, as shown in Figure 4 , Figure 7 The second spool 140 includes a sliding portion 141 and an extension portion 142. The sliding portion 141 is used to gap-fit with the first flow channel 111. The extension portion 142 and the sliding portion 141 jointly form a limiting shaft shoulder 1421. The extension portion 142 is provided with a second sealing groove 1422. The first sealing member 160 is arranged in the second sealing groove 1422 and located between the limiting shaft shoulder 1421 and the limiting portion 1111.

[0052] This embodiment proposes a specific structure of the second spool 140. The sliding portion 141 can cooperate with the inner wall of the first flow channel 111. On the one hand, the stability of the movement of the second spool 140 is improved. On the other hand, the gap between them can be used for fuel to pass through, thereby improving the reliability of fuel backflow.

[0053] The extension part 142 is located on the side of the sliding part 141 away from the plug 130, and the extension part 142 and the sliding part 141 form a limiting shaft shoulder 1421, that is, the outer diameter of the extension part 142 is smaller than the outer diameter of the sliding part 141. In this way, the reliability and stability of the second spool 140 in the first flow channel 111 can be improved. In addition, the extension part 142 is provided with a second sealing groove 1422, and the first sealing element 160 is installed in the second sealing groove 1422. In this way, the convenience of installing the first sealing element 160 can be improved, and the probability of the first sealing element 160 being accidentally separated due to frequent movement of the second spool 140 can be reduced, thereby improving the sealing reliability of the first sealing element 160.

[0054] In some embodiments, as shown in Figure 2 , Figure 4 and Figure 7 , the sliding part 141 is provided with a second accommodating groove 1411 for accommodating the second elastic element 150, and a plurality of second oil inlets 1412 in communication with the second accommodating groove 1411. The outer surface of the sliding part 141 is provided with a plurality of recessed planes 1413 in the circumferential direction, and the plurality of second oil inlets 1412 are arranged on the plurality of recessed planes 1413, respectively.

[0055] The second accommodating groove 1411 is used to accommodate the second elastic element 150 to limit the second elastic element 150, and improve the convenience of installing the second elastic element 150. Further, the recessed planes 1413 on the outer surface of the sliding part 141 can increase the distance between the sliding part 141 and the first flow channel 111, so that the fuel can enter the second oil inlets 1412 on the recessed planes 1413, thereby improving the smoothness of fuel flow.

[0056] In some embodiments, as shown in Figure 2 , the plug 130 is provided with a third accommodating groove 132 for accommodating the second elastic element 150. In this way, the second elastic element 150 can be limited, and the convenience of installing the second elastic element 150 can be improved. In addition, the two ends of the second elastic element 150 are arranged in the second accommodating groove 1411 and the third accommodating groove 132, respectively, which can further improve the convenience of installing the second elastic element 150, reduce the probability of the second elastic element 150 being offset, and improve the reliability and stability of the elastic force transmission.

[0057] In some embodiments, the first spool 110 and the second spool 140 are both conductive spools. When the fuel flows in the fuel tank system, static electricity is generated due to friction with the tank wall, pipeline and other components. The first spool 110 and the second spool 140 can conduct static electricity, thereby improving the safety and reliability of the double-tank system 1.

[0058] Optionally, the first valve core 110 and the second valve core 140 can be made of stainless steel. This provides both with good electrical conductivity, allowing for the discharge of static electricity. Furthermore, they can be machined quickly without the need for molds, thus saving costs.

[0059] In some embodiments, the cross-sectional shape of the second flow channel 131 is one of elliptical, rectangular, or polygonal. A cross-section refers to a plane perpendicular to the extending direction of the first flow channel 111. This configuration allows the plug 130 to be installed onto the first flow channel 111 via the second flow channel 131, thereby improving the ease of installation of the plug 130.

[0060] In some embodiments, there are multiple first oil inlets 1101, which are spaced apart along the circumferential direction of the first valve core 110. This arrangement helps to improve the smoothness and efficiency of fuel delivery.

[0061] like Figure 1 and Figure 3 As shown, in a second aspect, embodiments of this application provide a bidirectional valve 10. The bidirectional valve 10 includes a first valve body 200, a second valve body 300, and a valve core assembly 100 as described in the first aspect. The first valve body 200 and the second valve body 300 are connected to form a receiving cavity 11 for accommodating the valve core assembly 100. The first valve body 200 has an oil inlet channel 12 communicating with the receiving cavity 11, and the second valve body 300 has an oil return channel 13 communicating with the receiving cavity 11. A first elastic member 120 abuts against the second valve body 300 so that the first valve core 110 can be engaged or disengaged from the first valve body 200.

[0062] The valve core of the bidirectional valve 10 in this embodiment is the valve core assembly 100 described in the first aspect. The first elastic member 120 abuts against the second valve body 300. Under the action of the elastic force of the first elastic member 120, the first valve core 110 can be combined with or separated from the first valve body 200.

[0063] Thus, when the bidirectional valve 10 is applied to the dual-tank system 1, firstly, the fuel in the tank can flow into the engine oil inlet pipe 3 in the positive direction by the valve core structure composed of the first valve core 110 and the first elastic member 120. Since the rigidity of the second elastic member 150 is large, the oil outlet pressure of the two tanks will not be greater than the opening pressure of the second valve core 140, and the fuel of one tank will not flow into the other tank after flowing out, thereby improving the problem of fuel mixing of the two tanks. Secondly, under certain working conditions, the engine high-pressure oil pump will be depressurized, and since the pressure of the depressurized fuel will be greater than the opening pressure of the second valve core 140, the fuel in the engine oil inlet pipe 3 will open the second valve core 140, so that the fuel flows back to a certain tank in the reverse direction through the valve core structure composed of the plug 130, the second valve core 140 and the second elastic member 150, thereby avoiding accumulation in the engine oil inlet pipe 3, and improving the problem of pipe rupture caused by the increase of pipe pressure. Thus, it is beneficial to reduce the probability of pipe rupture while reducing the probability of fuel mixing of the two tanks, thereby improving the reliability and stability of the operation of the dual-tank system 1.

[0064] In some embodiments, as shown in Figure 3 The first valve core 110 includes a first section 113 and a second section 114, the first section 113 is located away from the second valve body 300, the diameter of the first section 113 is smaller than that of the second section 114, and the first oil inlet 1101 is arranged on the first section 113. In this way, on the one hand, the second section 114 can guide the movement of the first valve core 110 to avoid sticking of the first valve core 110. On the other hand, the diameter of the first section 113 is small, and the first oil inlet 1101 is arranged on the first section 113, thereby improving the efficiency and smoothness of fuel delivery.

[0065] In some embodiments, the first valve body 200 and / or the second valve body 300 are also conductive valve bodies, thereby improving the safety and reliability of the dual-tank system 1.

[0066] Alternatively, the first valve body 200 and the second valve body 300 can also be made of stainless steel. In this way, on the one hand, they have good conductivity and can discharge static electricity. On the other hand, they can be processed by machining process, which has short cycle and does not need to be opened, thereby saving costs.

[0067] In some embodiments, as shown in Figure 3 The bidirectional valve 10 further includes a third sealing member 14 for sealing the first valve body 200 and the second valve body 300, which can be a sealing ring, a sealing gasket, a sealing felt, etc. In this way, it is beneficial to improve the sealing performance of the bidirectional valve 10.

[0068] In some embodiments, as shown inFigure 1 As shown, the first valve body 200 and / or the second valve body 300 is further provided with an identifier 15 extending in the direction in which the first valve body 200 points to the second valve body 300, the identifier 15 representing the positive flow direction of the fuel, that is, the direction from the fuel tank to the engine oil inlet pipe, which can ensure the delivery efficiency of the fuel. In this way, the wrong installation can be avoided, thereby facilitating the convenience and reliability of the installation of the bidirectional valve 10.

[0069] As shown, Figure 6 In a third aspect, the embodiments of the present application provide a dual-tank system 1. The dual-tank system 1 comprises a three-way valve 2, an engine oil inlet pipe 3, a first fuel tank 4, a second fuel tank 5, and the bidirectional valve 10 of the second aspect. The engine oil inlet pipe 3 is in communication with the first port of the three-way valve 2, the first fuel tank 4 is in communication with the second port of the three-way valve 2 through a first oil pipe 6, the second fuel tank 5 is in communication with the third port of the three-way valve 2 through a second oil pipe 7, and the bidirectional valve 10 is connected in series in the first oil pipe 6 and / or the second oil pipe 7.

[0070] In this way, first, the fuel in the fuel tank can flow into the engine oil inlet pipe 3 in the positive direction by the valve core structure composed of the first valve core 110 and the first elastic member 120. Since the rigidity of the second elastic member 150 is large, the oil outlet pressure of the two fuel tanks will not be greater than the opening pressure of the second valve core 140, and the fuel of one of the two fuel tanks will not flow into the other fuel tank, thereby improving the problem of fuel mixing of the two fuel tanks. Second, under certain working conditions, the engine high-pressure oil pump will be depressurized, and since the pressure of the depressurized fuel will be greater than the opening pressure of the second valve core 140, the fuel in the engine oil inlet pipe 3 will open the second valve core 140, so that the fuel flows back to a certain fuel tank in the reverse direction through the valve core structure composed of the plug 130, the second valve core 140, and the second elastic member 150, thereby avoiding the accumulation in the engine oil inlet pipe 3, and improving the problem of pipe rupture caused by the increase of the pipeline pressure. Therefore, it is beneficial to reduce the probability of pipe rupture while reducing the probability of fuel mixing of the two fuel tanks, thereby improving the reliability and stability of the operation of the dual-tank system 1.

[0071] In addition, the bidirectional valve 10 is connected in series in the first oil pipe 6 and / or the second oil pipe 7, that is, one bidirectional valve 10 can be provided, or two bidirectional valves 10 can be provided, which can be flexibly set according to the actual situation.

[0072] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, which shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A valve trim assembly characterized by, The valve core assembly comprises: a first valve core provided with a first flow channel, a first accommodating groove located outside the first flow channel, and a first oil inlet communicating with the first accommodating groove; a first elastic member arranged in the first accommodating groove, a portion of the first elastic member extending out of the first accommodating groove for abutting against an external structure; a plug connected to one end of the first flow channel away from the first accommodating groove, the plug being provided with a second flow channel; a second valve core located in the first flow channel and movable along the extension direction of the first flow channel; a second elastic member arranged between the plug and the second valve core, the second elastic member having a rigidity greater than that of the first elastic member.

2. The valve trim assembly of claim 1, wherein, The valve core assembly further comprises a first sealing member and a second sealing member; one end of the first flow channel away from the plug is provided with a limiting portion, and the second valve core abuts against the limiting portion through the first sealing member; a first sealing groove is arranged on the side surface of the first valve core away from the first accommodating groove, and the second sealing member is arranged in the first sealing groove.

3. The valve trim assembly of claim 2, wherein, The second valve core comprises: a sliding portion for gap cooperation with the first flow channel; and an extension portion, the extension portion and the sliding portion jointly forming a limiting shoulder, the extension portion being provided with a second sealing groove, and the first sealing member being arranged in the second sealing groove and located between the limiting shoulder and the limiting portion.

4. The valve trim assembly of claim 3, wherein, The sliding portion is provided with a second accommodating groove for accommodating the second elastic member and a plurality of second oil inlets communicating with the second accommodating groove, and an outer surface of the sliding portion is provided with a plurality of recessed planes spaced apart in a circumferential direction, and the plurality of second oil inlets are respectively arranged on the plurality of recessed planes; and / or, the plug is provided with a third accommodating groove for accommodating the second elastic member.

5. The valve trim assembly of claim 1, wherein, The first valve core and the second valve core are both conductive valve cores.

6. The valve trim assembly of claim 1, wherein, The cross-sectional shape of the second flow channel is one of an oval shape, a rectangular shape, and a polygonal shape.

7. The valve trim assembly of claim 1, wherein, The first oil inlet is a plurality of and arranged spaced apart in a circumferential direction of the first valve core.

8. A bidirectional valve characterized by The valve core assembly comprises a first valve body, a second valve body, and any one of the valve core assemblies according to claims 1-7; The first valve body and the second valve body are connected to form an accommodating cavity for accommodating the valve core assembly, the first valve body is provided with an oil inlet passage communicating with the accommodating cavity, and the second valve body is provided with an oil return passage communicating with the accommodating cavity; The first elastic member abuts against the second valve body, so that the first valve core can be combined with or separated from the first valve body.

9. The bidirectional valve of claim 8, wherein, The first valve core comprises a first section and a second section, the first section being located on a side of the second section away from the second valve body, the diameter of the first section being smaller than that of the second section, and the first oil inlet being arranged on the first section.

10. A dual tank system characterized by, The valve core assembly comprises: a three-way valve; an engine oil inlet pipe communicating with a first port of the three-way valve; a first oil tank and a second oil tank, the first oil tank being connected to a second port of the three-way valve through a first oil pipe, and the second oil tank being connected to a third port of the three-way valve through a second oil pipe; and the bidirectional valve according to any one of claims 8-9 is connected in series in the first oil pipe and / or the second oil pipe.

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