Low-friction high-pollution-resistant electromagnetic valve feedback pin structure

Abstract

The utility model provides a low friction force high anti -pollution solenoid valve feedback pin structure relates to solenoid valve technical field, and this structure includes valve core and feedback pin, is provided with the pin hole in the valve core, feedback pin is slidably fitted in the pin hole, and the upper end part and / or lower end part of feedback pin outer peripheral wall is provided with the first anti -pollution cavity that communicates with the pin hole and is used for storing the pollutant. The utility model has the advantages that the first anti -pollution cavity of feedback pin end part can store the pollutant, reduces the accumulation of pollutant in the cooperation gap of feedback pin and pin hole, reduces the risk of jamming caused by the pollutant, reduces the overall friction, improves the stress uniformity, and finally improves the solenoid valve pressure curve precision.

Description

Technical Field

[0001] This utility model relates to the field of solenoid valve technology, and more specifically, to a low-friction, high-pollution-resistant solenoid valve feedback pin structure. Background Technology

[0002] In hydraulic control systems, the proportional pressure solenoid valve, as a core component for pressure regulation, has its feedback pin design directly affecting its control accuracy and reliability. In existing technologies, such as... Figure 16 As shown, the feedback pin 2 of the proportional pressure solenoid valve often adopts a columnar structure with a relatively long overall size. This results in a large contact area with the hole wall when it slides within the pin hole 3 of the valve core 1, easily generating significant friction. Simultaneously, because the columnar structure lacks effective contaminant containment space, small particles, oil stains, and other contaminants in the system easily accumulate in the mating gap between the feedback pin 2 and the pin hole 3. This not only further increases frictional resistance but may also lead to uneven force on the feedback pin, causing jamming.

[0003] The aforementioned problems directly cause a decrease in the accuracy of the solenoid valve's pressure curve, manifesting as increased pressure output fluctuations and slow response speed. In severe cases, it can even lead to solenoid valve failure, affecting the stability of the entire hydraulic system. Especially in complex operating conditions such as construction machinery and automotive hydraulic control, the risk of contaminant intrusion is higher. The traditional columnar feedback pin's anti-contamination capability is insufficient, and frequent jamming failures increase equipment maintenance costs and reduce operating efficiency. Utility Model Content

[0004] This invention addresses the technical problem of existing pressure solenoid valves where the feedback pin easily accumulates contaminants. To overcome the shortcomings of the prior art, this invention provides a method that optimizes the structural design of the feedback pin by setting a dedicated contaminant storage area at its end. This reduces friction, enhances anti-contamination capabilities, simplifies the installation process, and meets the low-cost requirements of industrial production.

[0005] To achieve the purpose of this utility model, the following technical solution is adopted: A low-friction, high-contamination-resistant solenoid valve feedback pin structure includes a valve core and a feedback pin. The valve core has a pin hole. The feedback pin slides within the pin hole. The upper and / or lower ends of the outer peripheral wall of the feedback pin each have a first anti-contamination cavity communicating with the pin hole and used to store contaminants. The first anti-contamination cavity at the end of the feedback pin stores contaminants, reducing the accumulation of contaminants in the gap between the feedback pin and the pin hole, and lowering the risk of jamming due to contaminants.

[0006] As preferred, the first anti-pollution cavity is a first annular groove arranged on the outer peripheral wall of the end portion of the feedback pin and distributed in the circumferential direction. Through the above structure, an annular storage space can be formed at the end portion of the feedback pin, and the pollution storage space is further optimized, the anti-pollution capability is improved, the end portion is prevented from being stuck, the sliding smoothness of the feedback pin is ensured, and the structure is simple and easy to process.

[0007] As preferred, the cross section of the first annular groove is in the shape of an outwardly open rectangle or an outwardly open circular arc. Through the design of the rectangular cross section, the volume of the annular groove can be maximized, the pollution storage capacity is enhanced, the pollution is prevented from accumulating in the groove, the sticking probability is reduced, and the rectangular structure is easy to process and reduces the production difficulty.

[0008] As preferred, the intermediate section of the outer peripheral wall of the feedback pin is provided with at least one second anti-pollution cavity which is in communication with the pin hole and used for storing pollution. Compared with the existing columnar structure, the contact state of the feedback pin and the pin hole is optimized through the design of the dispersed anti-pollution cavity, the unnecessary friction area is reduced, the overall friction force is reduced, the stress uniformity is improved, and the pressure curve precision of the electromagnetic valve is finally improved.

[0009] As preferred, the second anti-pollution cavity is a second annular groove arranged on the outer peripheral wall of the middle portion of the feedback pin and distributed in the circumferential direction. Through the annular groove at the middle portion, the deficiencies of the anti-pollution cavities at both ends are supplemented, the pollution entering the middle gap is stored, and the overall sticking risk is further reduced. The middle annular groove can reduce the contact area of the feedback pin and the pin hole, reduce the sliding friction force, and cooperate with the first anti-pollution cavity to further improve the anti-pollution performance of the feedback pin and ensure smooth movement.

[0010] As preferred, the cross section of the second annular groove is in the shape of an outwardly open rectangle or an outwardly open circular arc. Through the above structure, the pollution storage effect is optimized, and the friction and sticking are reduced.

[0011] As preferred, when a plurality of second anti-pollution cavities are arranged, all the second anti-pollution cavities are distributed on the outer peripheral wall of the feedback pin in the length direction of the feedback pin. Through the plurality of second anti-pollution cavities, the contact area of the feedback pin and the pin hole is further reduced, and the pollution storage space is further optimized to improve the anti-pollution capability.

[0012] As preferred, the end face of each end portion of the feedback pin is an outwardly convex circular arc face. Through the circular arc face, the end portion corner can be eliminated, the probability of foreign matter entering the gap between the pin hole and the feedback pin is reduced, the sticking risk caused by foreign matter is reduced from the source, the circular arc face design can optimize the end portion stress and reduce the sticking risk, and the installation and movement of the feedback pin are facilitated.

[0013] As preferred, the first anti-pollution cavity at the upper end and the first anti-pollution cavity at the lower end are symmetrically arranged on the feedback pin, and the feedback pin is designed as a whole in a symmetrical manner. The symmetrical structure enables the feedback pin to be installed without distinguishing the direction, thereby simplifying the installation process and reducing the installation error rate. The symmetrical design is suitable for the existing equipment of the production line, and no additional adjustment tool is required, thereby realizing low-cost investment and improving the production efficiency. Meanwhile, the symmetrical design ensures uniform stress and improves the pressure curve precision of the electromagnetic valve.

[0014] In summary, the utility model has the advantages of: First, the anti-pollution ability is strong, and the jamming is reduced. The first anti-pollution cavity (first ring groove) arranged at the two ends of the feedback pin and the second anti-pollution cavity (second ring groove) arranged at the middle part can effectively store the pollutants entering the gap between the pin hole and the feedback pin, thereby greatly reducing the risk of jamming caused by the accumulation of pollutants on the matching surface. The arc surface design of the end face of the feedback pin at the two ends can reduce the corners and the possibility of foreign matter entering the gap, thereby reducing the jamming risk from the source.

[0015] Second, the friction is reduced, and the pressure curve precision is improved. The second ring groove at the middle part and the first ring groove at the two ends reduce the contact area of the feedback pin and the pin hole, thereby reducing the friction in the sliding process. The reduction of the friction and the optimized end force of the arc surface improve the problem of uneven stress of the feedback pin, which is helpful to improve the pressure curve precision of the electromagnetic valve.

[0016] Third, the production and installation are facilitated, and the cost is low. The first ring groove and the second ring groove adopt a rectangular cross section with an outward opening, which is simple in structure and convenient for processing and manufacturing. The feedback pin is designed as a whole in a symmetrical manner, and the two first anti-pollution cavities are symmetrically arranged on both sides of the second anti-pollution cavity. The installation does not need to distinguish the direction, thereby simplifying the installation process and reducing the installation error rate, which is suitable for the low-cost investment demand of the production line. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 FIG. 1 is a structural schematic view of an electromagnetic valve feedback pin structure according to an embodiment of the utility model.

[0018] Figure 2 FIG. 2 is a sectional view of the electromagnetic valve feedback pin structure according to the embodiment of the utility model.

[0019] Figure 3 FIG. 3 is a second structural schematic view of the anti-pollution cavity according to the embodiment of the utility model.

[0020] Figure 4 FIG. 4 is a third structural schematic view of the anti-pollution cavity according to the embodiment of the utility model.

[0021] Figure 5 FIG. 5 is a fourth structural schematic view of the anti-pollution cavity according to the embodiment of the utility model.

[0022] Figure 6is the fifth structural schematic view of the anti-fouling cavity of the embodiment one of the utility model.

[0023] Figure 7 is the sixth structural schematic view of the anti-fouling cavity of the embodiment one of the utility model.

[0024] Figure 8 is the structural schematic view of the electromagnetic valve feedback pin structure of the embodiment two of the utility model.

[0025] Figure 9 is the sectional view of the electromagnetic valve feedback pin structure of the embodiment two of the utility model.

[0026] Figure 10 is the structural schematic view of the feedback pin of the embodiment two of the utility model.

[0027] Figure 11 is the structural schematic view of the feedback pin of the embodiment three of the utility model.

[0028] Figure 12 is the structural schematic view of the feedback pin of the embodiment four of the utility model.

[0029] Figure 13 is the structural schematic view of the feedback pin of the embodiment five of the utility model.

[0030] Figure 14 is the structural schematic view of the feedback pin of the embodiment six of the utility model.

[0031] Figure 15 is the structural schematic view of the feedback pin of the embodiment seven of the utility model.

[0032] Figure 16 is the existing electromagnetic valve feedback pin structure.

[0033] Mark explanation: 1, valve core;2, feedback pin;21, first anti-fouling cavity;22, second anti-fouling cavity;23, circular surface;3, pin hole. Specific implementation

[0034] First, those skilled in the art should understand that these embodiments are only used to explain the technical principles of the embodiments of the application, and are not intended to limit the protection scope of the embodiments of the application. Those skilled in the art can adjust it as needed in order to adapt to specific application occasions.

[0035] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature. The first and second features can be in direct contact, or the first and second features can be in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0037] The present application will be described in further detail below in conjunction with the drawings and specific embodiments.

[0038] Embodiment one As shown in Figures 1 to 2 A low-friction high-anti-pollution electromagnetic valve feedback pin structure, comprising a valve core 1 and a feedback pin 2; the valve core 1 is provided with a pin hole 3; the feedback pin 2 is slidingly fitted in the pin hole 3, and the upper end and the lower end of the outer peripheral wall of the feedback pin 2 are both provided with a first anti-pollution cavity 21 which is in communication with the pin hole 3 and is used for storing pollutants; the middle section of the outer peripheral wall of the feedback pin 2 is provided with a second anti-pollution cavity 22 which is in communication with the pin hole 3 and is used for storing pollutants. The first anti-pollution cavities 21 at both ends of the feedback pin 2 and the second anti-pollution cavity 22 in the middle part can store pollutants, reduce the accumulation of pollutants in the gap between the feedback pin 2 and the pin hole 3, and reduce the risk of jamming caused by pollutants. At the same time, compared with the existing columnar structure, the dispersed anti-pollution cavity design can optimize the contact state of the feedback pin 2 and the pin hole 3, reduce unnecessary friction area, reduce overall friction, improve stress uniformity, and ultimately improve the precision of the electromagnetic valve pressure curve.

[0039] As shown in Figure 1 and Figure 2As shown, the first anti-pollution cavity 21 is a first annular groove arranged on the outer peripheral wall of the end portion of the feedback pin 2 and distributed circumferentially. Through the above structure, an annular storage space can be formed at the end portion of the feedback pin 2, and the pollution storage space is further optimized to improve the anti-pollution capability and reduce the end portion jamming, thereby ensuring the smooth sliding of the feedback pin 2. At the same time, the structure is simple and easy to process. The cross section of the first annular groove is in the shape of a rectangle with the opening horizontally outward. Through the design of the rectangular cross section, the volume of the annular groove can be maximized, the pollution storage capacity is enhanced, the pollution accumulation in the slot is prevented, and the jamming probability is reduced. At the same time, the rectangular structure is easy to process, and the production difficulty is reduced.

[0040] As shown in Figure 1 and Figure 2 , the second anti-pollution cavity 22 is a second annular groove arranged on the outer peripheral wall of the middle portion of the feedback pin 2 and distributed circumferentially. Through the annular groove at the middle portion, the deficiencies of the anti-pollution cavities at both ends can be supplemented, and the pollution entering the middle gap can be stored, thereby further reducing the overall jamming risk. In addition, the middle annular groove can reduce the contact area between the feedback pin 2 and the pin hole 3, thereby reducing the sliding friction. At the same time, the second anti-pollution cavity 22 cooperates with the first anti-pollution cavity 21 to further improve the anti-pollution performance of the feedback pin 2 and ensure smooth movement. The cross section of the second annular groove is in the shape of a rectangle with the opening horizontally outward. Through the above structure, the pollution storage effect is optimized, and the friction and jamming are reduced.

[0041] The shape of the cross section of the first annular groove and the second annular groove also includes other forms: as shown in Figure 3 , the cross section of the first annular groove is in the shape of a rectangular with the opening horizontally outward and in a stepped form. As shown in Figure 4 , the cross section of the first annular groove is in the shape of a rectangle with the opening horizontally outward, and a chamfer is arranged at the opening of the rectangle. As shown in Figure 5 , the cross section of the first annular groove is in the shape of a rectangular with the opening horizontally outward and in a stepped form, and a chamfer is arranged at the middle step. As shown in Figure 6 , the cross section of the first annular groove is in the shape of a circular arc with the opening horizontally outward. As shown in Figure 7 , the cross section of the first annular groove is in the shape of a U-shaped with the opening horizontally outward. Among the above two first annular grooves, one or both shapes can be selected, and the second annular groove can select the same or different shape as the first annular groove.

[0042] As shown in Figure 1 and Figure 2 , the two first anti-pollution cavities 21 are symmetrically distributed on the upper and lower sides of the second anti-pollution cavity 22, and the feedback pin 2 is designed as a whole in a symmetrical form. Through the symmetrical structure, the feedback pin 2 does not need to be distinguished in direction during installation, thereby simplifying the installation process and reducing the installation error rate. In addition, the symmetrical design is suitable for the existing equipment of the production line, without the need for additional adjustment of the tooling, thereby realizing low-cost investment, improving production efficiency, ensuring uniform stress, and improving the pressure curve precision of the electromagnetic valve.

[0043] The utility model discloses a feedback pin 2 two ends set first anti -pollution cavity 21 (first annular groove) and middle part set second anti -pollution cavity 22 (second annular groove), can effectively store the pollutant of the clearance between the pin hole 3 and feedback pin 2, greatly reduce the risk of jam caused by the pollutant accumulation on the mating surface.

[0044] Example two The difference between this embodiment and example one is only on the end face of the two ends of the feedback pin 2, and the other structures are the same as those of example one.

[0045] This embodiment is Figure 8 and Figure 10 As shown in the figure, the end faces of the two ends of the feedback pin 2 are both outwardly convex arc surfaces 23. The arc surfaces 23 can eliminate the edges of the ends, reduce the probability of foreign matter entering the gap between the pin hole 3 and the feedback pin 2, especially during the installation or sliding process, thereby reducing the risk of jam caused by foreign matter from the source, and the arc surface 23 design can optimize the end stress, reduce the risk of jam, and facilitate the installation and movement of the feedback pin 2.

[0046] Example three The difference between this embodiment and example two is only on the two ends of the feedback pin 2, and the other structures are the same as those of example two.

[0047] This embodiment is Figure 11 As shown in the figure, the end faces of the two ends of the feedback pin 2 are also provided with outwardly convex arc surfaces 23, but steps are arranged at the two ends of the feedback pin 2, so that the diameters of the two ends of the feedback pin 2 are smaller than the diameter of the whole feedback pin 2. This can further reduce the possibility of jam caused by foreign matter entering.

[0048] Example four The difference between this embodiment and example two is only on the second anti-pollution cavity 22, as Figure 12 As shown in the figure, the intermediate section of the outer peripheral wall of the feedback pin 2 is provided with at least one second anti-pollution cavity 22 which is in communication with the pin hole 3 and is used for storing pollutants. This embodiment is provided with three second anti-pollution cavities 22, and the three second anti-pollution cavities 22 are spaced apart along the length direction of the feedback pin 2 and are arranged on the outer peripheral wall of the feedback pin 2. The three second anti-pollution cavities 22 can be equally spaced or non-equally spaced. Meanwhile, the first anti-pollution cavity 21 at the upper end is spaced apart from the second anti-pollution cavity 22 at the uppermost position, and the first anti-pollution cavity 21 at the lower end is spaced apart from the second anti-pollution cavity 22 at the lowermost position. The overall structure can be a symmetrical structure or an asymmetrical structure. The multiple second anti-pollution cavities 22 further increase the anti-pollution space, thereby further achieving the technical effects of optimizing the storage of pollutants and reducing friction and jam.

[0049] Example 5 The difference between this embodiment and Embodiment 2 lies only in the second anti-fouling cavity 22, such as... Figure 13 As shown, this embodiment includes a second anti-fouling chamber 22, positioned near the upper first anti-fouling chamber 21, resulting in an asymmetrical offset design for the feedback pin 2. This optimizes contaminant storage and reduces friction and jamming.

[0050] Example 6 The difference between this embodiment and embodiment five lies only in the first anti-fouling cavity 21, such as... Figure 14 As shown, this embodiment only includes one first anti-fouling cavity 21 at the upper end, omitting the first anti-fouling cavity 21 at the lower end. Conversely, only one first anti-fouling cavity 21 at the lower end can be provided, omitting the first anti-fouling cavity 21 at the upper end. A single first anti-fouling cavity 21 and a single second anti-fouling cavity 22 also provide a certain level of anti-fouling effect.

[0051] Example 7 The difference between this embodiment and Embodiment Six lies only in the second anti-fouling cavity 22, such as... Figure 15 As shown, this embodiment only includes one first anti-fouling cavity 21 at the upper end, omitting the first anti-fouling cavity 21 at the lower end and the second anti-fouling cavity 22 in the middle section. Alternatively, it can be configured by only including one first anti-fouling cavity 21 at the lower end, omitting the first anti-fouling cavity 21 at the upper end and the second anti-fouling cavity 22 in the middle section. A single first anti-fouling cavity 21 also provides a certain level of anti-fouling effect.

[0052] In the description of the embodiments of this application, it should be noted that the terms "inner" and "outer" and other terms indicating direction or positional relationship are based on the direction or positional relationship shown in the drawings. This is only for the convenience of description and does not indicate or imply that the device or component must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this application.

[0053] In the description of this application, the references to terms such as "an embodiment," "some embodiments," "in this embodiment," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0054] The above merely provides the specific implementation of the present application, but the protection scope of the present application is not limited to this. Any changes or replacements within the technical scope disclosed by the present application can be easily conceived by the person skilled in the art, and should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A low-friction, high-pollution-resistant solenoid valve feedback pin structure, comprising a valve core (1) and a feedback pin (2); wherein a pin hole (3) is provided in the valve core (1); and the feedback pin (2) is slidably fitted within the pin hole (3), characterized in that, The upper and / or lower ends of the outer peripheral wall of the feedback pin (2) are provided with a first anti-fouling cavity (21) that communicates with the pin hole (3) and is used to store pollutants.

2. The low-friction, high-pollution-resistant solenoid valve feedback pin structure according to claim 1, characterized in that, The first anti-fouling cavity (21) is a first annular groove provided on the outer peripheral wall of the end of the feedback pin (2) and distributed in the circumferential direction.

3. The low-friction, high-pollution-resistant solenoid valve feedback pin structure according to claim 2, characterized in that, The cross-section of the first annular groove is either rectangular or arc-shaped with the opening facing outwards.

4. The low-friction, high-pollution-resistant solenoid valve feedback pin structure according to claim 1, characterized in that, The middle section of the outer peripheral wall of the feedback pin (2) is provided with at least one second anti-fouling cavity (22) that communicates with the pin hole (3) and is used to store pollutants.

5. The low-friction, high-pollution-resistant solenoid valve feedback pin structure according to claim 4, characterized in that, The second anti-fouling cavity (22) is a second annular groove that is set on the outer peripheral wall of the middle section of the feedback pin (2) and distributed along the circumferential direction.

6. The low-friction, high-pollution-resistant solenoid valve feedback pin structure according to claim 5, characterized in that, The cross-section of the second annular groove is either rectangular with an outward opening or an arc with an outward opening.

7. The low-friction, high-pollution-resistant solenoid valve feedback pin structure according to claim 4, characterized in that, When multiple second antifouling cavities (22) are configured, all the second antifouling cavities (22) are distributed at intervals along the length direction of the feedback pin (2) on the outer peripheral wall of the feedback pin (2).

8. The low-friction, high-pollution-resistant solenoid valve feedback pin structure according to claim 1, characterized in that, The end faces of both ends of the feedback pin (2) are outwardly convex arc surfaces (23).

9. The low-friction, high-pollution-resistant solenoid valve feedback pin structure according to claim 1, characterized in that, The first anti-fouling cavity (21) at the upper end and the first anti-fouling cavity (21) at the lower end are symmetrically distributed on the feedback pin (2), and the feedback pin (2) as a whole adopts a symmetrical design.

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