Anti-blocking valve element structure

Abstract

The utility model provides an anti-blocking valve element structure, and belongs to the technical field of hydraulic pressure. The problems that an existing damping hole is prone to being blocked and inconvenient to clean are solved. The anti-blocking valve element structure comprises a valve element with one end provided with an oil inlet cavity, one end of the oil inlet cavity is provided with an oil inlet, the valve element is provided with an oil passing flow channel communicated with the other end of the oil inlet cavity, a filter element detachably connected with the valve element is arranged in the oil inlet cavity, and a filter gap is formed between the filter element and the cavity wall of the oil inlet cavity. A damping hole for communicating the filtering gap with the oil flowing channel is formed in the filter element, and the hole diameter of the damping hole is larger than the width of the filtering gap. The anti-blocking valve core structure has the advantages that the anti-blocking valve core structure is not easy to block, and the damping hole is convenient to clean.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydraulic pressure and relates to an anti-blocking valve core structure. Background Art

[0002] The hydraulic valve group includes a valve body, in which hydraulic valves with different functions are integrated. The hydraulic valve has a valve core, and the function of the hydraulic valve is realized by the movement of the valve core. The valve body has a control oil circuit or a feedback oil circuit for controlling the movement of the valve core. In the prior art, for the sake of compact structure, an oil circuit is opened on the valve core for oil to pass through. In order to avoid interference of the valve core by the pressure of the passing oil, a damping hole is provided on the valve core. The aperture of the damping hole is small, and the passing oil will inevitably contain impurities, which will cause blockage of the oil circuit in the valve core.

[0003] To solve the above problems, those skilled in the art can easily think of filtering the oil before it enters the oil circuit of the valve core. For example, Chinese patent literature discloses a hydraulically controlled reversing valve with bypass filtration ZL201320734671.1, in which a filter screen is arranged at one end of the valve core in the valve sleeve. Since the oil passing through the filter screen will inevitably impact the filter screen, the filter screen is prone to damage over time, thereby affecting the filtering effect. Therefore, the filter screen needs to be replaced regularly, and the removal of the filter screen requires the removal of the valve core first, resulting in unchanged replacement of the filter screen. To solve this problem, those skilled in the art can easily think of improving the structural strength of the filter screen to extend the maintenance cycle of the filter screen. Summary of the invention

[0004] The utility model aims to solve the above problems existing in the prior art and proposes an anti-clogging valve core structure to solve the technical problems that the damping hole is prone to clogging and is inconvenient to clean.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A valve core structure for preventing clogging comprises a valve core having an oil inlet cavity at one end, the oil inlet cavity having an oil inlet port at one end, the valve core being provided with an oil flow passage connected with the other end of the oil inlet cavity, the oil inlet cavity being provided with a filter element detachably connected to the valve core, a filter gap being formed between the filter element and the cavity wall of the oil inlet cavity, and the filter element being provided with a damping hole connecting the filter gap and the oil flow passage, the aperture of the damping hole being larger than the width of the filter gap.

[0007] The present application integrates both the filtering structure and the damping structure inside the valve core. Specifically, oil enters the interior of the valve core from the oil inlet of the oil inlet chamber, a filter element is arranged in the oil inlet chamber, and a filtering gap is formed between the filter element and the oil inlet chamber, so that the oil inlet of the oil inlet chamber is connected with the oil flow channel through the filter element. On this basis, the present application provides a damping hole connecting the filtering gap and the oil flow channel on the filter element, and the aperture of the damping hole is larger than the width of the filtering gap, so that the oil flowing into the valve core from the oil inlet of the oil inlet chamber needs to pass through the filtering gap before passing through the damping hole. The structure blocks impurities in the oil by means of the filtering gap, prevents impurities from entering the damping hole as much as possible, and eliminates the existing filter filtering structure; further, combined with the position of the filter element in the oil inlet chamber and the structure of the detachable connection between the filter element and the valve core, when technicians in this field maintain the valve core, they only need to disassemble the filter element to clean the damping hole externally, thereby improving the convenience of cleaning the damping hole.

[0008] In the above-mentioned anti-clogging valve core structure, the filter element includes a head and a stem, the diameter of the stem is smaller than the diameter of the head, and the stem is detachably connected to the valve core, and the head and the oil inlet cavity are gap-matched to form the above-mentioned filtration gap. The structure of the filter element is simple, and the gap matching makes it easy to ensure the width of the filtration gap.

[0009] In the above-mentioned anti-clogging valve core structure, the oil passage has a threaded section, the rod is screwed to the threaded section, and the rod is provided with the above-mentioned damping hole. This structure not only determines the size of the filter gap and facilitates the removal of the filter element, but also makes the position of the damping hole adjustable by adjusting the screwing length of the rod.

[0010] In the above-mentioned anti-clogging valve core structure, the threaded section is located at the bottom of the oil inlet chamber, one side of the head is fixedly connected to the rod, and the other side of the head is provided with an adjustment hole, an oil storage chamber is provided between the head and the bottom of the oil inlet chamber, and the damping hole is located in the oil storage chamber. The adjustment hole may be a hexagonal hole or a snap-on hole, and by inserting a tool in the prior art into the adjustment hole, the filter element can be conveniently disassembled, or the distance between the head and the bottom of the oil inlet chamber can be adjusted to adjust the size of the oil storage chamber, so that the oil storage chamber temporarily stores the oil passing through the filter gap, and the damping hole is provided in the oil storage chamber so that the oil in the oil storage chamber smoothly enters the damping hole.

[0011] In the anti-clogging valve core structure, a guide hole connecting the damping hole and the oil flow channel is provided at one end of the rod away from the head, and the axis of the damping hole is perpendicular to the axis of the rod. This structure can shorten the setting length of the damping hole on the one hand, and reduce the difficulty of processing the filter element on the other hand.

[0012] In the above-mentioned anti-clogging valve core structure, the oil flow passage also has a penetration section and a conduction section, the conduction section is connected to the threaded section through the penetration section, a step surface is formed between the conduction section and the penetration section, the rod abuts against the step surface, and the conduction section is arranged opposite to the guide hole. The step surface has a limiting effect on the rod and shortens the threaded connection length between the rod and the valve core; the conduction section is arranged opposite to the guide hole, which improves the stability of the oil flow in the valve core.

[0013] In the above-mentioned anti-clogging valve core structure, the oil inlet cavity is a blind hole extending from the end face of one end of the valve core along the axial direction of the valve core, the length of the blind hole is greater than the length of the head, and the side of the head facing the oil inlet cavity opening has a supporting surface, and the above-mentioned adjustment hole is provided on the supporting surface. This structure allows the filter element to be completely located in the oil inlet cavity, and this structure avoids the setting of the filter element occupying the original arrangement space of the valve core. The supporting surface can be used for the spring in the hydraulic valve spring cavity to abut, avoiding the need for an additional structure for the spring to abut in the valve core, thereby improving the structural compactness of the valve core.

[0014] In the anti-clogging valve core structure, the edges on both sides of the head have chamfers in the circumferential direction, and the chamfers and the cavity wall of the oil inlet cavity form a flared opening connected to the filter gap. The flared opening guides the oil, that is, guides the oil into the filter gap to improve the filtration efficiency.

[0015] Compared with the prior art, the anti-clogging valve core structure provided by the utility model has the following advantages:

[0016] 1. The present application sets the damping hole on the filter element, connects the filter element to the valve core, so that a filtering gap is formed between the filter element and the oil inlet cavity of the valve core. By setting the filtering gap smaller than the aperture of the damping hole, the filtering gap filters the oil entering the damping hole, cancels the existing filter screen structure, and still makes the damping hole not easy to be blocked. The damping hole can be directly cleaned by taking out the filter element. This structure makes it easy to clean the damping hole.

[0017] 2. The filter element is threadedly connected to the valve core. The filter gap can be dredged by moving the filter element without removing the filter element from the valve core to clean the damping hole. This structure further improves the convenience of cleaning. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the local structure of the valve core.

[0019] Figure 2 yes Figure 1 A partial enlarged view of point A in the middle.

[0020] Figure 3 It is a structural schematic diagram of the valve core being arranged in the valve body.

[0021] In the figure, 1, valve core; 11, oil inlet chamber; 111, oil inlet port; 12, oil flow channel; 121, threaded section; 122, penetration section; 123, conduction section; 13, step surface; 2, filter element; 21, head; 211, adjustment hole; 212, abutment surface; 22, rod; 221, damping hole; 222, guide hole; 3, filter gap; 4, oil storage chamber; 5, expansion port; 6, spring; 7, valve body; 8, screw plug. DETAILED DESCRIPTION

[0022] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0023] like Figure 1 As shown, the anti-clogging valve core structure includes a valve core 1 with an oil inlet chamber 11 at one end, an oil inlet port 111 at one end of the oil inlet chamber 11, and an oil inlet port 111 at one end of the oil inlet chamber 11. The oil inlet chamber 11 is a blind hole extending from the end face of one end of the valve core 1 along the axial direction of the valve core 1. The valve core 1 is provided with an oil flow channel 12 connected to the other end of the oil inlet chamber 11, and the oil flow channel 12 has a threaded section 121 arranged at the bottom of the blind hole; a filter element 2 detachably connected to the valve core 1 is arranged in the oil inlet chamber 11, and the filter element 2 includes a head 21 and a rod 22, one side of the head 21 is fixedly connected to the rod 22, and the other side of the head 21 is provided with an adjustment hole 211, the length of the blind hole is greater than the length of the head 21, and the diameter of the rod 22 is smaller than the diameter of the head 21, as shown in FIG. Figure 2 As shown, the head 21 and the oil inlet chamber 11 are gap-matched to form a filter gap 3, the rod 22 is threadedly connected to the threaded section 121, and a damping hole 221 is provided on the rod 22 to connect the filter gap 3 and the oil flow channel 12, the aperture of the damping hole 221 is larger than the width of the filter gap 3, and an oil storage chamber 4 is provided between the head 21 and the bottom of the oil inlet chamber 11, the damping hole 221 is located in the oil storage chamber 4, and the cross-sectional area of ​​the damping hole 221 is smaller than the cross-sectional area of ​​the oil flow channel 12. The edges on both sides of the head 21 are chamfered in the circumferential direction, and a flared opening 5 connecting the filter gap 3 is formed between the chamfer and the cavity wall of the oil inlet chamber 11.

[0024] like Figure 1 As shown, a guide hole 222 connecting the damping hole 221 and the oil flow channel 12 is provided at one end of the rod 22 away from the head 21, and the axis of the damping hole 221 is perpendicular to the axis of the rod 22. The oil flow channel 12 also has a penetration section 122 and a conduction section 123. The conduction section 123 is connected to the threaded section 121 through the penetration section 122. A step surface 13 is formed between the conduction section 123 and the penetration section 122. The rod 22 abuts against the step surface 13, and the conduction section 123 is arranged opposite to the guide hole 222. The head 21 has a support surface 212 on the side facing the oil inlet chamber 11, and the above-mentioned adjustment hole 211 is provided on the support surface 212.

[0025] like Figure 3 As shown, the valve core 1 is arranged in the valve body 7, and screw plugs 8 screwed to the valve body 7 are provided at both ends of the valve core 1, one end of the valve core 1 abuts against one screw plug 8, and a spring 6 is provided between the other end of the valve core 1 and the other screw plug 8, one end of the spring 6 abuts against the screw plug 8, and the other end of the spring 6 abuts against the abutment surface 212 of the filter element 2.

[0026] When it is necessary to maintain the valve core 1 of the present application, the screw plug 8 is removed from the valve body 7. If the filter gap 3 is not seriously blocked, there is no need to remove the filter element 2 from the valve core 1. It is only necessary to use the existing disassembly tool, insert the disassembly tool into the adjustment hole 211 and rotate it to move the filter element 2. After the impurities in the filter gap 3 fall out of the valve body 7, the screw plug 8 is screwed to the valve body 7 again to complete the maintenance of the valve core 1. If the filter gap 3 is seriously blocked, the filter element 2 is removed from the valve core 1, the filter element 2 is thoroughly cleaned, and after cleaning, the filter element 2 is screwed to the valve core 1 again, and the screw plug 8 is screwed to the valve body 7 to complete the maintenance of the valve core 1.

[0027] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0028] Although this article uses more terms such as valve core 1, oil inlet chamber 11, oil inlet port 111, oil flow channel 12, threaded section 121, penetration section 122, conduction section 123, step surface 13, filter element 2, head 21, adjustment hole 211, abutment surface 212, rod 22, damping hole 221, flow guide hole 222, filter gap 3, oil storage chamber 4, expansion port 5, spring 6, valve body 7, screw plug 8, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the utility model; interpreting them as any additional restrictions is contrary to the spirit of the utility model.

Claims

1. A valve core structure for preventing clogging, comprising a valve core (1) having an oil inlet cavity (11) at one end, the oil inlet cavity (11) having an oil inlet port (111) at one end, and an oil passage (12) communicating with the other end of the oil inlet cavity (11) being provided on the valve core (1), characterized in that: A filter element (2) detachably connected to the valve core (1) is provided in the oil inlet chamber (11); a filter gap (3) is formed between the filter element (2) and the chamber wall of the oil inlet chamber (11); and a damping hole (221) connecting the filter gap (3) and the oil flow channel (12) is provided on the filter element (2); the diameter of the damping hole (221) is larger than the width of the filter gap (3).

2. The anti-clogging valve core structure according to claim 1, characterized in that: The filter element (2) comprises a head (21) and a stem (22); the diameter of the stem (22) is smaller than the diameter of the head (21); the stem (22) is detachably connected to the valve core (1); and the head (21) and the oil inlet chamber (11) are gap-matched to form the above-mentioned filtering gap (3).

3. The anti-clogging valve core structure according to claim 2, characterized in that: The oil passage (12) has a threaded section (121), the rod (22) is threadedly connected to the threaded section (121), and the rod (22) is provided with the damping hole (221).

4. The anti-clogging valve core structure according to claim 3, characterized in that: The threaded section (121) is located at the bottom of the oil inlet chamber (11), one side of the head (21) is fixedly connected to the rod (22), and the other side of the head (21) is provided with an adjustment hole (211), an oil storage chamber (4) is provided between the head (21) and the bottom of the oil inlet chamber (11), and the damping hole (221) is located in the oil storage chamber (4).

5. The anti-clogging valve core structure according to claim 3 or 4, characterized in that: An end of the rod (22) away from the head (21) is provided with a guide hole (222) connecting the damping hole (221) and the oil flow channel (12); the axis of the damping hole (221) is perpendicular to the axis of the rod (22).

6. The anti-clogging valve core structure according to claim 5, characterized in that: The oil flow passage (12) further comprises a penetration section (122) and a conducting section (123); the conducting section (123) is connected to the threaded section (121) via the penetration section (122); a step surface (13) is formed between the conducting section (123) and the penetration section (122); the rod portion (22) abuts against the step surface (13); and the conducting section (123) is arranged opposite to the guide hole (222).

7. The anti-clogging valve core structure according to claim 4, characterized in that: The oil inlet chamber (11) is a blind hole extending from an end surface of one end of the valve core (1) along the axial direction of the valve core (1); the length of the blind hole is greater than the length of the head (21); the side of the head (21) facing the opening of the oil inlet chamber (11) has a supporting surface (212); the supporting surface (212) is provided with the above-mentioned adjustment hole (211).

8. The anti-clogging valve core structure according to any one of claims 2-4 and 7, characterized in that: The edges of both sides of the head (21) are chamfered in the circumferential direction, and a flared opening (5) communicating with the filter gap (3) is formed between the chamfer and the cavity wall of the oil inlet cavity (11).

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