A sealing movable component and a solenoid valve

Abstract

The present invention relates to the technical field of solenoid valves, and in particular, to a sealed movable assembly and a solenoid valve. The sealed movable assembly comprises: a movable body and a steel ball; a steel ball fixing portion is provided at one end of the movable body facing the fluid channel, the steel ball fixing portion is provided with a groove extending away from the fluid channel, the steel ball is a uniform sphere, the steel ball can protrude from the opening of the groove, a deformation portion is provided at the opening of the groove, the deformation portion can be pressed on the outer peripheral surface of the steel ball facing the opening of the groove, and exerts a force on the steel ball toward the bottom of the groove; a fitting surface is provided at the bottom of the groove, the fitting surface is a spherical surface, the diameter of the spherical surface is the same as that of the steel ball, and the fitting surface can fit with the outer peripheral surface of the steel ball. In this way, the problem that the steel ball in the solenoid valve is easy to loosen, which leads to poor product performance, is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of solenoid valves, and in particular to a sealing movable component and a solenoid valve. Background Art

[0002] The hydraulic control unit of the automobile braking system controls the change in oil supply and displacement by turning on and off the solenoid valve, thereby applying braking force to each wheel.

[0003] Based on the functional requirements, the air gap value of the existing automotive brake system solenoid valve as mentioned above should not change during the entire life cycle of the product due to the instability of the riveted structure. The service conditions of this product include high-pressure impact on the riveted structure steel ball and ensure that no functional failure occurs under this condition. Therefore, high-pressure (12-15MPa) gas testing items must be included in the product offline inspection to ensure that the flow, sealing and air gap do not deteriorate before and after the test. Only after the external sealing is verified can it flow into the assembly process as a qualified part, otherwise there is a risk of brake fluid leakage into the electrical control unit in a continuous high-load environment, causing a short circuit failure.

[0004] Based on the above test item restrictions, the existing groove for fixing the steel ball adopts a conical steel ball support surface. After actual testing, the steel ball that is riveted and pressed is easy to loosen, causing the product air gap to change when the combination state does not fail, thereby increasing the deviation of the hydraulic consistency of the solenoid valve under fixed voltage input, which is not conducive to product performance. Summary of the invention

[0005] In order to solve the problem that a steel ball in a solenoid valve is easily loosened, thereby causing poor product performance, the present invention provides a sealing movable component and a solenoid valve.

[0006] The first aspect of the present invention provides a sealing movable component, comprising: a movable part body and a steel ball; a steel ball fixing portion is provided at one end of the movable part body facing the fluid channel, the steel ball fixing portion is provided with a groove extending in a direction away from the fluid channel, the steel ball is a uniform sphere, the steel ball can protrude from the opening of the groove, a deformation portion is provided at the opening of the groove, the deformation portion can be pressed on the outer peripheral surface of the steel ball facing the opening of the groove, and exert a force on the steel ball toward the bottom of the groove; a fitting surface is provided at the bottom of the groove, the fitting surface is a spherical surface, the diameter of the spherical surface is the same as that of the steel ball, and the fitting surface can fit with the outer peripheral surface of the steel ball.

[0007] In some embodiments, the movable part body is further provided with an exhaust channel, a first end of the exhaust channel extends to the outer peripheral surface of the movable part body, and a second end of the exhaust channel extends to the fitting surface.

[0008] In some embodiments, the surface area of ​​the steel ball in contact with the contact surface is 45%-55% of the total surface area of ​​the steel ball.

[0009] In some embodiments, the depth of the groove is greater than the radius of the steel ball, and the deformation portion can bend into the groove.

[0010] In some embodiments, the cross section of the exhaust channel is circular, and the diameter of the exhaust channel is set to 0.3-0.5 mm.

[0011] In some embodiments, a plurality of exhaust passages are evenly distributed along the circumferential direction of the movable member body.

[0012] In some embodiments, the groove depth is greater than the radius of the steel ball; the groove depth is 1-1.2 times the radius of the steel ball.

[0013] The second aspect of the present invention also provides a solenoid valve, including the sealing movable component, valve body, valve seat and driving component in the above technical solution, the valve seat is arranged in the valve body, a fluid channel is arranged on the valve seat, the opening of the fluid channel is arranged toward the sealing movable component, the sealing movable component is arranged in the valve body, and can approach or move away from the valve seat under the drive of the driving component.

[0014] In some embodiments, a tapered surface is provided at the opening of the fluid channel, and the tapered surface is arranged along the extension direction of the fluid channel, and the cross-sectional area gradually increases.

[0015] In order to solve the problem that the steel ball in the solenoid valve is easy to loosen, thus resulting in poor product performance, the present invention has the following advantages:

[0016] The steel ball fixing part is used to rivet and fix the steel ball in the groove on the one hand, and on the other hand, the spherical surface provided at the bottom of the groove is used to fully fit and support the steel ball, thereby greatly reducing the gap between the steel ball and the groove, preventing high-pressure gas from entering the gap during use, and forming a reliable connection between the steel ball and the movable part body, ensuring that the height of the part of the steel ball protruding from the groove remains unchanged during the complete life cycle of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic structural diagram of a sealing movable assembly according to an embodiment is shown;

[0018] Figure 2 A schematic structural diagram of a movable body of an embodiment is shown;

[0019] Figure 3 A structural schematic diagram of a sealing movable assembly in the prior art is shown;

[0020] Figure 4 A schematic structural diagram of a solenoid valve according to an embodiment is shown.

[0021] Figure numerals: 10 - steel ball; 20 - movable part body; 21 - fitting surface; 22 - groove; 23 - deformation part; 30 - gas filling area; 40 - valve body; 50 - valve seat; 51 - fluid channel; 511 - conical surface. DETAILED DESCRIPTION

[0022] The present disclosure will now be discussed with reference to several exemplary embodiments. It should be understood that these embodiments are discussed only to enable those skilled in the art to better understand and thus implement the present disclosure, rather than implying any limitation on the scope of the present disclosure.

[0023] As used herein, the term "including" and its variants are to be interpreted as open-ended terms meaning "including but not limited to". The term "based on" is to be interpreted as "based at least in part on". The terms "one embodiment" and "an embodiment" are to be interpreted as "at least one embodiment". The term "another embodiment" is to be interpreted as "at least one other embodiment". The orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "vertical", "horizontal", "lateral", "longitudinal" and the like is based on the orientation or position relationship shown in the accompanying drawings. These terms are mainly for better describing the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation. In addition, in addition to being used to indicate an orientation or position relationship, some of the above terms may also be used to indicate other meanings, such as the term "upper" may also be used to indicate a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to the specific circumstances. In addition, the terms "install", "set", "provided with", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be an internal connection between two devices, elements or components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In addition, the terms "first", "second", etc. are mainly used to distinguish different devices, elements or components (the specific types and structures may be the same or different), and are not used to indicate or imply the relative importance and quantity of the indicated devices, elements or components. Unless otherwise specified, "plurality" means two or more.

[0024] This embodiment discloses a sealing movable assembly, such as Figure 1-2As shown, it may include: a movable part body 20 and a steel ball 10; a steel ball 10 fixing portion is provided at one end of the movable part body 20 facing the fluid channel 51, the steel ball 10 fixing portion is provided with a groove 22 extending in a direction away from the fluid channel 51, the steel ball 10 is a uniform sphere, the steel ball 10 can protrude from the opening of the groove 22, a deformation portion 23 is provided at the opening of the groove 22, the deformation portion 23 can be pressed on the outer peripheral surface of the steel ball 10 opening toward the groove 22, and apply a force toward the bottom of the groove 22 to the steel ball 10; a fitting surface 21 is provided at the bottom of the groove 22, the fitting surface 21 is a spherical surface, the diameter of the spherical surface is the same as that of the steel ball 10, and the fitting surface 21 can fit with the outer peripheral surface of the steel ball 10.

[0025] It should be noted that if Figure 3 As shown, the steel ball 10 support structure processed by conventional tools, that is, the groove 22 in the movable body 20 for accommodating and fixing the steel ball 10 is a conical surface, and the steel ball 10 is fixed in the groove 22 by riveting the movable body 20 around the steel ball 10. The fixed structure should be able to pass the relevant air tightness tests of the product, including high-pressure (12-15MPa) gas testing items to ensure that the flow, sealing and air gap are not deteriorated before and after the test. However, in actual tests, only after the high-pressure gas testing item, the steel ball 10 of the sealing movable component became abnormally loose, and the air gap value before and after the test changed significantly, which did not meet the product design requirements. This phenomenon is actually due to the fact that during the high-pressure test, such as Figure 3 As shown, the gas filling area 30 is related to the high-pressure gas. Before the initial test or formal use, the gas pressure in the gas filling area 30 is consistent with the external atmospheric pressure. After the test or formal use, the high-pressure gas will enter the gas filling area 30 through the tiny gaps around the steel ball 10. When the high-pressure gas is withdrawn, the gas filling area 30 can only be released through the tiny gaps around the steel ball 10. This process is slow. Then, for the steel ball 10, a high-pressure side is formed in the gas filling area 30 that pushes the steel ball 10 to move outward. Under the action of the pressure difference at both ends, the steel ball 10 squeezes the riveted structure used to fix the steel ball 10, causing the riveted structure to deform, thereby causing the steel ball 10 to loosen. Even if it passes the test during inspection, it will cause deformation and eventually cause the steel ball 10 to loosen during subsequent long-term use.

[0026] In the above technical solution of the present application, the steel ball 10 fixing part is used to fix the steel ball 10 in the groove 22 by riveting, and on the other hand, the spherical surface provided at the bottom of the groove 22 is used to fully fit and support the steel ball 10, thereby greatly reducing the gap between the steel ball 10 and the groove 22, preventing high-pressure gas from entering the gap during use, and forming a reliable connection between the steel ball 10 and the movable body 20, ensuring that the height of the part of the steel ball 10 protruding from the groove 22 remains unchanged during the complete life cycle of the product. Specifically, the profiling surface matching the steel ball 10 can be processed by a special-shaped forming knife, and even if there is a certain processing error, the steel ball 10 and the profiling surface should be able to basically fit, eliminating most of the possible gas cavities. After riveting, the steel ball 10 is reliably fixed on the movable body 20, and after being subjected to the impact of high-pressure gas, due to the absence of the gas filling area 30, the flow rate, sealing and air gap before and after the test are all kept consistent, which has better stability than the conventional solution.

[0027] In addition, there are integrated sealing movable components in the prior art, but compared with the sealing movable components used in this application, there are certain shortcomings in terms of processing cost, material cost, processing accuracy and surface quality. On the one hand, in terms of processing and material costs, the processing process of the integrated sealing movable component is complex and delicate, resulting in a significant increase in processing costs. At the same time, due to the use of high-performance polymers (such as PEEK), its material cost is also relatively high. This high cost may limit the promotion and application of this component in certain cost-sensitive applications. On the other hand, there are limitations in processing accuracy and surface quality in the integrated sealing movable component. Taking PEEK material as an example, its commonly used processing technology is injection molding. Although injection molding has advantages in production efficiency, it has certain limitations in processing accuracy. In particular, when it comes to complex geometric shapes such as spherical surfaces, injection molding often makes it difficult to ensure that the roughness of the spherical surface meets high-precision requirements. This uneven surface roughness may affect the sealing performance of the component and the mating parts, thereby limiting the applicability of the component in application scenarios requiring high precision and high-quality surfaces to a certain extent.

[0028] In the above scheme of the present application, a split structure is adopted, and the steel ball and the movable part body are respectively regarded as two components. On the one hand, it simplifies the complex structure of the assembly and turns it into a plurality of relatively simple parts, and has high processing precision and high qualified rate: in particular, the surface roughness of the steel ball of the key sealing structure can be very good, and the valve assembly after assembly has good sealing performance and high qualified rate; on the other hand, multiple parts can be manufactured with different materials, and the material cost is low and wear-resistant: the steel ball and the push rod are generally made of stainless steel or bearing steel, which has low cost and good durability compared with the peek material mentioned above.

[0029] In actual use, due to the existence of processing errors, even with high processing accuracy, due to the influence of factors such as machining tool wear and machine vibration, some fine gap structures are inevitably still present between the fitting surface 21 and the outer peripheral surface of the steel ball 10. Therefore, in order to further solve the problem of high-pressure gas that may remain in the gap structure, such as Figure 1 As shown, the movable part body 20 is further provided with an exhaust channel, a first end of the exhaust channel extends to the outer peripheral surface of the movable part body 20 , and a second end of the exhaust channel extends to the fitting surface 21 .

[0030] By utilizing the exhaust channel, when the movable body 20 drives the steel ball 10 away from the fluid channel 51, even if a very small amount of high-pressure gas remains between the steel ball 10 and the fitting surface 21, it can be quickly discharged through the exhaust channel, so that the steel ball 10 is no longer affected by the high pressure.

[0031] In some embodiments, the surface area of ​​the steel ball 10 and the fitting surface 21 is 45%-55% of the total surface area of ​​the steel ball 10. In the riveting process of the steel ball 10 and the movable body 20, a crucial factor is the ratio of the fitting surface area of ​​the steel ball 10 and the fitting surface 21 to the overall surface area of ​​the steel ball 10. When this ratio reaches a range of 45% to 55%, the loosening of the steel ball 10 caused by the expansion gas can be effectively reduced, and the strength of the steel ball 10 after riveting can be effectively guaranteed, thereby ensuring the clearance control level of the solenoid valve. By accurately controlling the size of the contoured surface processing on the push rod, the area ratio of the steel ball 10 after riveting can be guaranteed to be 45% to 55%.

[0032] As a specific implementation method, for fixing the steel ball 10, Figure 1-2 As shown, the depth of the groove 22 is greater than the radius of the steel ball 10 , and the deformation portion 23 can be bent into the groove 22 .

[0033] Specifically, by forcing the deformable portion 23 to bend toward the groove 22 and generate plastic deformation, the deformable portion 23 can be buckled on the outer peripheral surface of the steel ball 10, so as to apply a clamping force to the steel ball 10 and a pushing force into the groove 22, thereby fixing the steel ball 10. This process is relatively simple and can be achieved based on current production methods and equipment, with low cost.

[0034] Due to the machining error generated during machining, the gap distribution between the fitting surface 21 and the outer peripheral surface of the steel ball 10 may not be uniform or may not be interconnected. Therefore, a plurality of exhaust channels may be evenly distributed along the circumferential direction of the movable body 20. The plurality of exhaust channels may be respectively provided with a plurality of openings arranged at the fitting surface 21, so that the pressurized gas accumulated therein can be effectively discharged.

[0035] Specifically, in order to ensure that the exhaust channel can exhaust quickly and at the same time avoid having too much impact on the strength of the movable body 20, the cross section of the exhaust channel is circular, and the diameter of the exhaust channel is set to 0.3-0.5 mm.

[0036] In some embodiments, in order to ensure that the steel ball 10 can protrude from the groove 22 and obtain sufficient riveting force for fixing, the depth of the groove 22 is greater than the radius of the steel ball 10; the depth of the groove 22 is 1-1.2 times the radius of the steel ball 10. Through the above arrangement, when the deformation part 23 provided at the opening of the groove 22 is forced to undergo plastic deformation, it can be ensured that the steel ball 10 protrudes from the end of the movable body 20, and at the same time, the area of ​​the part riveted by the deformation part 23 is large enough to ensure the riveting strength.

[0037] The second aspect of the present application also provides a solenoid valve. Figure 4 As shown, it includes the sealing movable assembly, valve body 40, valve seat 50 and driving assembly in the above technical solution, the valve seat 50 is arranged in the valve body 40, a fluid channel 51 is arranged on the valve seat 50, the opening of the fluid channel 51 is arranged toward the sealing movable assembly, the sealing movable assembly is arranged in the valve body 40, and can be driven by the driving assembly to approach or move away from the valve seat 50. Its beneficial effects are the same as those of the above sealing movable assembly, and will not be repeated here.

[0038] Furthermore, Figure 4 As shown, a conical surface 511 is provided at the opening of the fluid channel 51, and the conical surface 511 is provided along the extension direction of the fluid channel 51, and the cross-sectional area gradually increases. The setting of the conical surface 511 can guide the steel ball 10 to fall into the opening of the fluid channel 51, and at the same time, when the steel ball 10 fits with the conical surface 511, under the action of the driving component, it can fit closely with the conical surface 511, thereby achieving better sealing.

[0039] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present disclosure, and in actual applications, various changes may be made thereto in form and detail without departing from the scope of the present disclosure.

Claims

1. A sealing movable assembly, characterized in that: For solenoid valves, including: The movable body and the steel ball; A steel ball fixing portion is provided at one end of the movable part body facing the fluid channel, and the steel ball fixing portion is provided with a groove extending away from the fluid channel, the steel ball is a uniform sphere, and the steel ball can protrude from the opening of the groove, and a deformation portion is provided at the opening of the groove, and the deformation portion can be pressed on the outer peripheral surface of the steel ball facing the opening of the groove, and exert a force on the steel ball toward the bottom of the groove; The bottom of the groove is provided with a fitting surface, the fitting surface is a spherical surface, the diameter of the spherical surface is the same as that of the steel ball, and the fitting surface can fit with the outer peripheral surface of the steel ball; The movable part body is further provided with an exhaust channel, a first end of the exhaust channel extends to the outer peripheral surface of the movable part body, and a second end of the exhaust channel extends to the fitting surface.

2. A sealing movable assembly according to claim 1, characterized in that: The surface area of ​​the steel ball in contact with the contact surface is 45%-55% of the total surface area of ​​the steel ball.

3. A sealing movable assembly according to claim 1, characterized in that: The depth of the groove is greater than the radius of the steel ball, and the deformation portion can be bent into the groove.

4. A sealing movable assembly according to claim 3, characterized in that: The cross section of the exhaust channel is circular, and the diameter of the exhaust channel is set to 0.3-0.5 mm.

5. A sealing movable assembly according to claim 4, characterized in that: A plurality of exhaust passages are evenly distributed along the circumferential direction of the movable part body.

6. A sealing movable assembly according to claim 1, characterized in that: It is characterized in that The depth of the groove is greater than the radius of the steel ball; the depth of the groove is 1-1.2 times the radius of the steel ball.

7. A solenoid valve, characterized in that: It comprises the sealing movable component, valve body, valve seat and driving component as described in any one of claims 1 to 6, wherein the valve seat is arranged in the valve body, a fluid channel is arranged on the valve seat, the opening of the fluid channel is arranged toward the sealing movable component, the sealing movable component is arranged in the valve body, and can approach or move away from the valve seat under the drive of the driving component.

8. The solenoid valve according to claim 7, characterized in that: A tapered surface is provided at the opening of the fluid channel, and the tapered surface is arranged along the extension direction of the fluid channel, and the cross-sectional area gradually increases.

Images