Electromagnetic valve for balancing air pressure of oil tank

Abstract

The utility model discloses an electromagnetic valve for balancing the air pressure of an oil tank, which comprises an upper valve body, a middle valve body and a lower valve body which are connected in sequence, and a valve core component positioned in the middle valve body and the lower valve body, the valve element assembly comprises a fixed iron core, a movable iron core, a movable valve element, a sealing valve sleeve and a sealing guide rod. Noise reduction rubber corresponding to the fixed iron core is arranged at the axial end part of the movable iron core; a valve sleeve sealing outer ring and a valve sleeve sealing inner ring which are concentric are arranged on the axial outer end face of the sealing valve sleeve. The noise reduction rubber is arranged between the movable iron core and the fixed iron core, and when the electromagnetic valve is electrified and attracted, sharp metal collision sound cannot be generated between the movable iron core and the fixed iron core, so that the working noise is effectively reduced; due to the fact that the valve sleeve sealing outer ring and the valve sleeve sealing inner ring which are concentric are arranged on the axial outer end face of the sealing valve sleeve, the valve sleeve sealing outer ring and the valve sleeve sealing inner ring can be matched with a valve body sealing convex ring and a guide rod sealing convex ring to form a double-line and double-face sealing mode, and compared with a single-line and double-face sealing mode in the prior art, the sealing performance of a product can be better improved.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a solenoid valve for balancing the air pressure of an oil tank. Background Art

[0002] When a powered vehicle is consuming fuel, the air pressure inside the fuel tank is lower than the external air pressure. When the pressure difference exceeds a certain level, external gas needs to enter to maintain the pressure balance. On the contrary, when the fuel evaporates under high temperature and vibration conditions, the internal air pressure is higher than the external air pressure, and the pressure difference exceeds a certain level, it needs to be discharged to the outside. The fuel tank isolation valve is used between the high-pressure fuel tank and the carbon canister of a powered vehicle. One side is connected to the exhaust system inside the fuel tank, and the other side is connected to the carbon canister. It is driven by an electrical signal to exchange with the atmosphere and balance the pressure inside the fuel tank.

[0003] The prior art with application number 202222280245.7 discloses a solenoid valve for balancing the air pressure in an oil tank, comprising an upper valve body, a middle valve body and a lower valve body. The inner cavity of the upper valve body is connected with the inner cavity of the middle valve body, and a sealing surface is formed at the connection point through a sealing assembly. A circle of flange is provided at the bottom end of the upper valve body, which contacts with the sealing surface to form a first channel; a solenoid valve is fixed in the cavity formed by the connection between the inner cavity of the middle valve body and the inner cavity of the lower valve body, and the solenoid valve is fixedly connected to the sealing assembly to drive the sealing assembly away from the upper valve body to open the first channel; a sealing guide rod is provided in the middle part of the sealing assembly, and the sealing guide rod comprises a sealing joint, a guide rod and a small-diameter spring; a circle of flange is provided at the bottom end of the sealing joint, which contacts with the sealing surface to form a second channel, and the guide rod passes through the through hole and is connected to the solenoid valve through a locking member, and the locking member compresses the small-diameter spring so that the second channel is in a sealed state.

[0004] The solenoid valve in the above prior art has the following disadvantages:

[0005] 1. When the existing solenoid valve is powered on and closed, the moving iron core and the fixed iron core will make a sharp metal collision sound;

[0006] 2. The existing solenoid valve adopts a single-line and surface sealing method. For products with extremely high sealing requirements, the single-line and surface sealing cannot meet the requirements, which leads to poor repeatability and reproducibility of sealing performance. Utility Model Content

[0007] In order to solve the above technical problems, the utility model provides a solenoid valve for balancing the gas pressure of an oil tank, comprising an upper valve body, a middle valve body and a lower valve body connected in sequence;

[0008] The upper valve body is connected to a first ventilation pipeline leading to the carbon canister, and the middle valve body is connected to a second ventilation pipeline leading to the fuel tank;

[0009] It also includes a valve core assembly located in the middle valve body and the lower valve body, and a coil assembly disposed on the outer side wall of the lower valve body and electrically connected to the valve core assembly;

[0010] The valve core assembly includes a fixed iron core axially fixedly arranged in the lower valve body, a moving iron core axially slidingly arranged in the lower valve body through a sliding sleeve, a moving valve core axially connected to the moving iron core, and a sealing valve sleeve sleeved on the moving valve seat at the axial end of the moving valve core, the inner cavity of the middle valve body is provided with a valve body sealing convex ring corresponding to the sealing valve sleeve, a hollow cavity is provided between the moving iron core and the moving valve core, and a large-diameter spring is sleeved on the moving valve core; the valve core assembly also includes a sealing guide rod axially passing through the moving valve seat, the axial end surface of the sealing guide rod is provided with a guide rod sealing convex ring corresponding to the axial outer end surface of the sealing valve sleeve, the other end of the sealing guide rod is located in the hollow cavity and a locking piece is provided at the end thereof, and a small-diameter spring located between the locking piece and the moving valve core is sleeved on the sealing guide rod;

[0011] The axial end of the moving iron core is provided with a noise reduction rubber corresponding to the fixed iron core;

[0012] The axial outer end surface of the sealing valve sleeve is provided with a concentric valve sleeve sealing outer ring and a valve sleeve sealing inner ring. The valve sleeve sealing outer ring is located radially outside the valve body sealing convex ring, and the valve sleeve sealing inner ring is located radially inside the guide rod sealing convex ring.

[0013] Among them, the noise reduction rubber includes a rubber clamping column, a connecting part and a rubber limiting ring which are axially connected in sequence; the rubber clamping column passes through the mounting hole at the end of the moving iron core and is located in the hollow cavity, the connecting part is clamped in the mounting hole, the rubber limiting ring is located on the lower end surface of the moving iron core and corresponds to the fixed iron core to achieve noise reduction; the rubber limiting ring has an axially arranged rubber hole.

[0014] Furthermore, it also includes a flow limiting component arranged in the upper valve body;

[0015] The flow limiting assembly includes a flow limiting plate axially slidably arranged in the upper cavity of the upper valve body, a flow limiting column axially arranged on the flow limiting plate and corresponding to the first ventilation line, a flow limiting spring sleeved on the flow limiting column, and a throttling hole that passes through the flow limiting plate and the flow limiting column and is connected to the first ventilation line; the two ends of the flow limiting spring correspond to the limiting grooves at the flow limiting plate and the air inlet of the first ventilation line respectively, the diameter of the flow limiting plate is smaller than the inner diameter of the upper cavity, and the inner wall of the upper cavity is axially provided with a lower convex ring and an upper convex ring corresponding to the flow limiting plate to realize the limitation of the axial position of the flow limiting plate.

[0016] Furthermore, it also includes a pressure sensor arranged on the middle valve body and corresponding to the second ventilation pipeline, so as to sense the oil and gas pressure in the oil tank.

[0017] Wherein, the outer side wall of the middle valve body is also provided with a mounting seat to achieve stable installation of the solenoid valve.

[0018] Wherein, the outer side wall of the middle valve body is also provided with a handle to facilitate the removal and placement of the solenoid valve during disassembly and assembly.

[0019] Among them, the moving valve core, the sealing guide rod and the flow limiting plate are all made of plastic, and the plastic material can effectively reduce the overall weight and manufacturing cost of the product.

[0020] The sealing valve sleeve is made of rubber, which can reduce the overall weight of the product and achieve more effective sealing by utilizing the elasticity of the rubber.

[0021] Through the above technical solution, the utility model has the following beneficial effects:

[0022] 1. A noise-reducing rubber is arranged between the moving iron core and the fixed iron core. When the solenoid valve is energized and attracted, there will be no sharp metal collision sound between the moving iron core and the fixed iron core, which effectively reduces the working noise.

[0023] 2. Since the axial outer end face of the sealing valve sleeve is provided with a concentric valve sleeve sealing outer ring and a valve sleeve sealing inner ring, it can cooperate with the valve body sealing convex ring and the guide rod sealing convex ring to form a double-line and surface sealing method, which can better improve the sealing performance of the product compared with the single-line and surface sealing method of the prior art;

[0024] 3. The noise reduction rubber increases the glue hole during rubber vulcanization. The adhesion between the noise reduction rubber and the moving iron core can be better guaranteed by the pulling of the glue and rubber in the glue hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for describing the embodiments.

[0026] Figure 1 This is a schematic diagram of the three-dimensional structure of the solenoid valve disclosed in the embodiment of the utility model;

[0027] Figure 2 This is a schematic diagram of the cross-sectional structure of the solenoid valve disclosed in the embodiment of the utility model;

[0028] Figure 3 This is a schematic diagram of the three-dimensional structure of the noise reduction rubber disclosed in the embodiment of the utility model;

[0029] Figure 4 for Figure 2 Schematic diagram of the enlarged structure of part B in the middle.

[0030] The numbers in the figure indicate: 10. upper valve body; 11. first ventilation line; 20. middle valve body; 21. second ventilation line; 22. valve body sealing convex ring; 30. lower valve body; 40. mounting seat; 50. handle; 60. coil assembly; 70. pressure sensor; 80. current limiting assembly; 81. current limiting plate; 82. current limiting column; 83. current limiting spring; 84. throttle hole; 90. noise reduction rubber; 91. rubber clamp column; 92. connection part ; 93. Rubber limit ring; 931. Rubber hole; 100. Valve core assembly; 111. Fixed iron core; 112. Moving iron core; 113. Moving valve core; 1131. Moving valve seat; 114. Sealing valve sleeve; 1141. Valve sleeve sealing outer ring; 1142. Valve sleeve sealing inner ring; 115. Large diameter spring; 116. Sealing guide rod; 1161. Guide rod sealing convex ring; 117. Locking piece; 118. Small diameter spring; 119. Sleeve. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention.

[0032] refer to Figure 1-4 The present embodiment provides a solenoid valve for balancing the gas pressure in a fuel tank, comprising an upper valve body 10, a middle valve body 20 and a lower valve body 30 connected in sequence; the upper valve body 10 is connected to a first ventilation line 11 leading to a carbon canister, and the middle valve body 20 is connected to a second ventilation line 21 leading to the fuel tank; it also includes a valve core assembly 100 located in the middle valve body 20 and the lower valve body 30, and a coil assembly 60 arranged on the outer wall of the lower valve body 30 and electrically connected to the valve core assembly 100; it also includes a pressure sensor 70 arranged on the middle valve body 20 and corresponding to the second ventilation line 21, so as to sense the oil and gas pressure in the fuel tank; a mounting seat 40 is also provided on the outer wall of the middle valve body 20 to achieve a stable installation of the solenoid valve; a handle 50 is also provided on the outer wall of the middle valve body 20 to facilitate the convenient placement and removal of the solenoid valve during disassembly and assembly.

[0033] The valve core assembly 100 includes a fixed iron core 111 axially fixedly arranged in the lower valve body 30, a moving iron core 112 axially slidably arranged in the lower valve body 30 through a sliding sleeve 119, a moving valve core 113 axially connected to the moving iron core 112, and a sealing valve sleeve 114 sleeved on a moving valve seat 1131 at the axial end of the moving valve core 113. The inner cavity of the middle valve body 20 is provided with a valve body sealing convex ring 22 corresponding to the sealing valve sleeve 114. There is a sealing convex ring 22 between the moving iron core 112 and the moving valve core 113. The movable valve core 113 is sleeved with a large-diameter spring 115; the valve core assembly 100 also includes a sealing guide rod 116 axially passing through the movable valve seat 1131, and the axial end face of the sealing guide rod 116 is provided with a guide rod sealing convex ring 1161 corresponding to the axial outer end face of the sealing valve sleeve 114, the other end of the sealing guide rod 116 is located in the hollow cavity and a locking piece 117 is provided at the end thereof, and a small-diameter spring 118 is sleeved on the sealing guide rod 116 and located between the locking piece 117 and the movable valve core 113.

[0034] Among them, the axial end of the moving iron core 112 is provided with a noise-reducing rubber 90 corresponding to the fixed iron core 111; the noise-reducing rubber 90 includes a rubber clamping column 91, a connecting part 92 and a rubber limiting ring 93 which are axially connected in sequence; the rubber clamping column 91 passes through the mounting hole at the end of the moving iron core 112 and is located in the hollow cavity, the connecting part 92 is clamped in the mounting hole, the rubber limiting ring 93 is located on the lower end surface of the moving iron core 112 and corresponds to the fixed iron core 111 to achieve noise reduction; the rubber limiting ring 93 has an axially arranged rubber hole 931.

[0035] Among them, the axial outer end face of the sealing valve sleeve 114 is provided with a concentric valve sleeve sealing outer ring 1141 and a valve sleeve sealing inner ring 1142. The valve sleeve sealing outer ring 1141 is located radially outside the valve body sealing convex ring 22, and the valve sleeve sealing inner ring 1142 is located radially inside the guide rod sealing convex ring 1161.

[0036] Among them, it also includes a flow limiting component 80 arranged in the upper valve body 10; the flow limiting component 80 includes a flow limiting plate 81 axially slidably arranged in the upper cavity of the upper valve body 10, a flow limiting column 82 axially arranged on the flow limiting plate 81 and corresponding to the first ventilation pipeline 11, a flow limiting spring 83 sleeved on the flow limiting column 82, and a throttling hole 84 that passes through the flow limiting plate 81 and the flow limiting column 82 and is connected to the first ventilation pipeline 11; the two ends of the flow limiting spring 83 respectively correspond to the limiting grooves at the flow limiting plate 81 and the air inlet of the first ventilation pipeline 11, the diameter of the flow limiting plate 81 is smaller than the inner diameter of the upper cavity, and the inner wall of the upper cavity is axially provided with a lower convex ring and an upper convex ring corresponding to the flow limiting plate 81 to realize the limitation of the axial position of the flow limiting plate 81.

[0037] Among them, the moving valve core 113, the sealing guide rod 116 and the flow limiting plate 81 are all made of plastic, which can effectively reduce the overall weight and manufacturing cost of the product; the sealing valve sleeve 114 is made of rubber, which can reduce the overall weight of the product and use the elasticity of rubber to achieve more effective sealing.

[0038] The working principle of this utility model:

[0039] When the solenoid valve is closed, the coil assembly 60 is not energized, the fixed iron core 111 is separated from the movable iron core 112, and the sealing valve sleeve 114 and the sealing guide rod 116 are in a reset state under the action of the large-diameter spring 115 and the small-diameter spring 118. At this time, the fuel tank isolation valve is in a pressure-maintaining state and the current limiting assembly 80 is in a reset state, the fuel vapor is stored in the high-pressure fuel tank, and the pressure in the fuel tank is within the tolerance range of the high-pressure fuel tank;

[0040] When the positive pressure of the fuel vapor generated in the fuel tank exceeds the set value of the fuel tank, the high-pressure gas flows from the second ventilation pipeline 21 to the first ventilation pipeline 11 and forces the sealing guide rod 116 to stretch the small-diameter spring 118 and separate from the sealing valve sleeve 114 to open the gas passage to the first ventilation pipeline 11 so that the fuel and gas can enter the carbon canister. At this time, the fuel tank isolation valve is in a pressure relief state and the flow limiting assembly 80 is in a reset state.

[0041] When the negative pressure of fuel vapor generated in the fuel tank exceeds the set value of the fuel tank, the high-pressure gas flows from the first ventilation pipeline 11 to the second ventilation pipeline 21 and forces the movable valve core 113 to compress the large-diameter spring 115 and make the sealing valve sleeve 114 separate from the valve body sealing convex ring 22 to open the gas passage to the second ventilation pipeline 21 so that the fuel and gas can enter the fuel tank. At this time, the fuel tank isolation valve is in the air supply state and the flow limiting component 80 is in the reset state.

[0042] When refueling the fuel tank, the coil assembly 60 is energized to attract the fixed iron core 111 and the moving iron core 112 and use the rubber limit ring 93 to achieve noise reduction. At this time, the high-pressure gas flows from the second ventilation pipeline 21 to the first ventilation pipeline 11 to achieve oil and gas pressure relief in the fuel tank, so that the pressure in the fuel tank is balanced and the flow limiting assembly 80 is in a reset state; further, when the pressure in the fuel tank is relatively large, the high pressure in the fuel tank will force the flow limiting plate 81 to compress the flow limiting spring 83 and close the gas channel between the flow limiting plate 81 and the convex ring on the inner wall of the upper cavity, and the oil and gas continue to flow to the carbon canister through the flow limiting plate 81 and the throttle hole 84 on the flow limiting column 82, while relieving pressure to protect the ROV (ROV: a flip valve is a kind of vehicle The safety device of the fuel tank has the main function of releasing the oil and gas generated at various stages of the vehicle's operation to prevent oil leakage when it is dynamic or stationary; in addition, during the refueling process, when other valves (such as FLVV) are closed, the ROV can also ensure the ventilation requirements of the fuel tank. This design helps to improve the refueling efficiency of the fuel tank and allows accurate fuel levels and more flexible and diverse installation methods; the working principle and design of the ROV take into account the safety and efficiency of the vehicle's fuel system. Through its specific functions and operations, it ensures that the fuel safety and convenience of the vehicle during use are not affected. When the high pressure in the fuel tank reaches the set equilibrium value, the limiting plate 81 is reset under the action of the limiting spring 83.

[0043] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to the above embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A solenoid valve for balancing the gas pressure in an oil tank, comprising an upper valve body (10), a middle valve body (20) and a lower valve body (30) connected in sequence; The upper valve body (10) is connected to a first ventilation pipeline (11) leading to the carbon canister, and the middle valve body (20) is connected to a second ventilation pipeline (21) leading to the fuel tank; It also includes a valve core assembly (100) located in the middle valve body (20) and the lower valve body (30), and a coil assembly (60) disposed on the outer side wall of the lower valve body (30) and electrically connected to the valve core assembly (100); The valve core assembly (100) comprises a fixed iron core (111) axially fixedly arranged in the lower valve body (30), a moving iron core (112) axially slidably arranged in the lower valve body (30) via a sliding sleeve (119), a moving valve core (113) axially connected to the moving iron core (112), and a sealing valve sleeve (114) sleeved on a moving valve seat (1131) at the axial end of the moving valve core (113), the inner cavity of the middle valve body (20) is provided with a valve body sealing convex ring (22) corresponding to the sealing valve sleeve (114), and there is a middle valve core (114) between the moving iron core (112) and the moving valve core (113). The movable valve core (113) is provided with a large-diameter spring (115); the valve core assembly (100) further comprises a sealing guide rod (116) axially passing through the movable valve seat (1131); the axial end surface of the sealing guide rod (116) is provided with a guide rod sealing convex ring (1161) corresponding to the axial outer end surface of the sealing valve sleeve (114); the other end of the sealing guide rod (116) is located in the hollow cavity and a locking member (117) is provided at the end thereof; the sealing guide rod (116) is provided with a small-diameter spring (118) located between the locking member (117) and the movable valve core (113); Features: The axial end of the moving iron core (112) is provided with a noise reduction rubber (90) corresponding to the fixed iron core (111); The axial outer end surface of the sealing valve sleeve (114) is provided with a concentric valve sleeve sealing outer ring (1141) and a valve sleeve sealing inner ring (1142); the valve sleeve sealing outer ring (1141) is located radially outside the valve body sealing convex ring (22), and the valve sleeve sealing inner ring (1142) is located radially inside the guide rod sealing convex ring (1161).

2. A solenoid valve for balancing the gas pressure in an oil tank according to claim 1, characterized in that: The noise reduction rubber (90) comprises a rubber clamping column (91), a connecting portion (92) and a rubber limiting ring (93) which are axially connected in sequence; the rubber clamping column (91) passes through a mounting hole at the end of the moving iron core (112) and is located in the hollow cavity, the connecting portion (92) is clamped in the mounting hole, and the rubber limiting ring (93) is located on the lower end surface of the moving iron core (112) and corresponds to the fixed iron core (111) to achieve noise reduction; the rubber limiting ring (93) has an axially arranged rubber hole (931).

3. The solenoid valve for balancing the gas pressure in the oil tank according to claim 1, characterized in that: It also includes a flow limiting component (80) disposed in the upper valve body (10); The flow limiting assembly (80) comprises a flow limiting plate (81) axially slidably arranged in the upper cavity of the upper valve body (10), a flow limiting column (82) axially arranged on the flow limiting plate (81) and corresponding to the first ventilation pipeline (11), a flow limiting spring (83) sleeved on the flow limiting column (82), and a throttling hole (84) penetrating the flow limiting plate (81) and the flow limiting column (82) and connected to the first ventilation pipeline (11); the two ends of the flow limiting spring (83) respectively correspond to the limiting grooves at the flow limiting plate (81) and the air inlet of the first ventilation pipeline (11); the diameter of the flow limiting plate (81) is smaller than the inner diameter of the upper cavity, and the inner wall of the upper cavity is axially provided with a lower convex ring and an upper convex ring corresponding to the flow limiting plate (81) to realize the limitation of the axial position of the flow limiting plate (81).

4. The solenoid valve for balancing the gas pressure in the oil tank according to claim 1, characterized in that: It also includes a pressure sensor (70) arranged on the middle valve body (20) and corresponding to the second ventilation pipeline (21) for sensing the oil and gas pressure in the oil tank.

5. The solenoid valve for balancing the gas pressure in the oil tank according to claim 1, characterized in that: The outer side wall of the middle valve body (20) is also provided with a mounting seat (40) to achieve stable mounting of the solenoid valve.

6. The solenoid valve for balancing the gas pressure in the oil tank according to claim 1, characterized in that: The outer side wall of the middle valve body (20) is also provided with a handle (50) to facilitate the removal and installation of the solenoid valve during disassembly and assembly.

7. The solenoid valve for balancing the gas pressure in the oil tank according to claim 1, characterized in that: The movable valve core (113), the sealing guide rod (116) and the flow limiting plate (81) are all made of plastic.

8. The solenoid valve for balancing the gas pressure in the oil tank according to claim 1, characterized in that: The sealing valve sleeve (114) is made of rubber.

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