Valve body main hole structure of anti-jumping ring and electromagnetic valve

Abstract

The utility model discloses a valve body main hole structure of an anti-jumping ring and an electromagnetic valve, and belongs to the technical field of electromagnetic valves. The inner wall of the valve body main hole is provided with an air hole surface and a sealing surface which are arranged at an interval, and the air hole surface is in transition connection with the sealing surface through an inclined surface; the slopes located on the two sides of the air hole face comprise the dangerous slope and the safe slope, the height of the sealing face connected with the dangerous slope is the same as the height of the sealing face connected with the safe slope, the safe slope is configured to be matched with the forward movement path of the valve rod, and the movement is driven by air pressure. The dangerous slope is configured to be matched with the reverse moving path of the valve rod, and the moving path is driven by elastic force; and the axial projection length of the dangerous inclined plane is greater than that of the safe inclined plane. A high-risk dangerous inclined plane is lengthened, a gentle slope is optimized, the back pressure side negative pressure effect and the axial pull-out force are reduced, meanwhile, the radial pressing effect is enhanced, and the phenomenon that the sealing ring jumps due to the high pressure difference is fundamentally restrained.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, specifically relating to a valve body main hole structure and electromagnetic valve with anti-jump ring. Background Technology

[0002] In a solenoid valve, a seal is mounted on the valve stem, forming a valve stem assembly together with the valve stem. This valve stem assembly moves axially within the valve body to achieve on / off control between the air inlet and the working port.

[0003] However, during operation, when the valve stem assembly moves forward, if its front (the direction of the seal's movement) is subjected to high-pressure gas while its rear is directly exposed to the atmosphere, a large pressure difference will be formed on both sides of the seal, which may cause the seal to pop out from the valve stem's mounting position. This phenomenon is called "slipping".

[0004] The main mechanism of "loop skipping" failure is as follows: Due to the significant pressure difference on both sides of the seal, the gas flows at high speed in the tiny gap between the seal and the valve body, forming a local negative pressure zone on the rear side (back pressure side) of the seal, generating a backward suction force; at the same time, high-pressure gas seeps into the fitting gap between the valve stem and the seal from the front side and acts on the inner diameter area of ​​the seal, causing its inner wall to expand outward under high pressure. At this time, the outer side of the seal is in a negative pressure state, forming a radial pressure difference between the inside and outside, which exacerbates its outward expansion trend.

[0005] Furthermore, during the final closing stage when the valve stem approaches the sealing surface, the seal needs to climb the slope inside the valve body. At this time, the high-speed airflow, negative pressure suction, internal pressure expansion, and slope friction work together to subject the seal to complex axial and radial forces. In particular, the closer the seal is to the valve body sealing surface, the more significant the above effects become, making it easier for it to axially deviate or even completely detach from the valve stem mounting groove, resulting in sealing failure and consequently causing the solenoid valve to lose its function. Utility Model Content

[0006] This utility model addresses the aforementioned problems in the existing technology by proposing a valve body main hole structure and a solenoid valve that prevents the valve from jumping.

[0007] This utility model can be achieved through the following technical solutions:

[0008] A valve body main bore structure with an anti-jump ring, comprising:

[0009] The valve body main hole has an inner wall with an air hole surface and a sealing surface spaced apart, and the air hole surface and the sealing surface are connected by a bevel transition.

[0010] The inclined surfaces located on both sides of the vent surface include a dangerous inclined surface and a safe inclined surface. The sealing surface connected to the dangerous inclined surface and the sealing surface connected to the safe inclined surface are at the same height.

[0011] The safety ramp is configured to adapt to the positive movement path of the valve stem, and this movement is driven by air pressure.

[0012] The dangerous ramp is configured to adapt to the reverse movement path of the valve stem, and this movement is driven by an elastic force.

[0013] The axial projection length of the dangerous inclined plane is greater than the axial projection length of the safe inclined plane.

[0014] As a further improvement of this utility model, the dangerous inclined surface is arranged in a multi-segment structure and includes at least a first inclined surface segment and a second inclined surface segment. The first inclined surface segment is connected to the vent surface, and the second inclined surface segment is connected to the sealing surface.

[0015] As a further improvement of this utility model, the slope of the first inclined plane segment is the same as the slope of the safety inclined plane.

[0016] As a further improvement of this utility model, the slope of the second inclined plane segment is less than the slope of the first inclined plane segment.

[0017] As a further improvement of this utility model, there is a transition step between the first inclined section and the second inclined section, and the transition step is connected to the first inclined section and the second inclined section by a rounded corner.

[0018] As a further improvement of this utility model, the transition step is set as a plane or an inclined plane.

[0019] As a further improvement of this utility model, when the transition step is set as an inclined surface, its inclination direction is the same as that of the first inclined surface segment and the second inclined surface segment.

[0020] As a further improvement of this utility model, when the transition step is set as an inclined plane, its slope is less than the slope of the second inclined plane segment.

[0021] As a further improvement of this utility model, the dangerous inclined plane is designed as a single-segment structure, and its slope is less than that of the safe inclined plane.

[0022] A solenoid valve is also provided, comprising:

[0023] The valve body has the valve body main hole structure with the aforementioned anti-jump ring;

[0024] A valve stem is provided with a sealing ring. As the valve stem moves, the sealing ring switches between the vent surface and the sealing surface to open or close the airflow channel.

[0025] A pneumatic push plate and a return spring are located on opposite sides of the valve stem. The pneumatic push plate is used to push the valve stem to move forward, and the return spring is used to push the valve stem to move in the opposite direction.

[0026] Compared with the prior art, the present invention has the following beneficial effects:

[0027] 1. Effectively prevents sealing ring skipping and failure.

[0028] By distinguishing between the forward (pneumatically driven) and reverse (spring-driven) movement paths of the valve stem, the innovative design concepts of "safe slope" and "dangerous slope" are proposed. The dangerous slope, which is of high risk, is lengthened, sloped gently, or optimized with a multi-segment structure. This design significantly reduces the rate of force change of the sealing ring during the reset process, reduces the negative pressure effect on the back pressure side and the axial pull-out force, and enhances the radial clamping effect. This fundamentally suppresses the sealing ring jumping caused by high pressure difference and greatly improves the sealing stability of the solenoid valve under high pressure and high frequency conditions.

[0029] 2. Multi-segment hazardous ramp design

[0030] In Example 1, a composite structure of "multi-segment inclined plane + transition step" is adopted to form a mechanical guidance mechanism of "downward pressure - gap limiting - gradual rise" during the movement of the sealing ring. The transition step applies instantaneous radial clamping force to the sealing ring, compressing the gap between it and the valve stem, effectively preventing high-pressure gas from entering the inner diameter area and weakening the internal pressure expansion power source. The subsequent second inclined plane section further reduces friction and axial force, realizing the gradual release of stress, making the sealing behavior more controllable and stable.

[0031] 3. Single-section hazardous ramp design

[0032] Although the single-segment dangerous slope has a simplified structure, it can still effectively improve the stress state during the reverse movement of the sealing ring along the dangerous slope by reducing the overall slope inclination angle. It is also easy to manufacture and has good consistency. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the valve body main hole structure according to Embodiment 1 of this utility model;

[0034] Figure 2 This is a schematic diagram of the valve body main hole structure according to Embodiment 2 of this utility model;

[0035] Figure 3 This is a cross-sectional view of the solenoid valve of this utility model;

[0036] Figure 4 This is the utility model Figure 3 A magnified view of a section at point A in the middle;

[0037] Figure 5This is the utility model Figure 3 A magnified view of a section at point B in the middle.

[0038] In the figure, 100 is the valve body; 110 is the vent surface; 120 is the sealing surface; 130 is the danger slope; 131 is the first slope section; 132 is the second slope section; 133 is the transition step; 140 is the safety slope; 200 is the valve stem; 210 is the sealing ring; 220 is the air push plate; and 230 is the return spring. Detailed Implementation

[0039] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. The technical methods of the present invention will be further described, but the present invention is not limited to these embodiments.

[0040] Example 1

[0041] like Figure 1 As shown, this utility model provides a valve body main hole structure with an anti-jump ring, comprising:

[0042] The valve body main hole has an inner wall with an air hole surface 110 and a sealing surface 120 spaced apart, and the air hole surface 110 and the sealing surface 120 are connected by a bevel transition.

[0043] The inclined surfaces located on both sides of the vent surface 110 include a dangerous inclined surface 130 and a safe inclined surface 140. The sealing surface 120 connected to the dangerous inclined surface 130 and the sealing surface 120 connected to the safe inclined surface 140 have the same height.

[0044] The safety ramp 140 is configured to adapt to the positive movement path of the valve stem 200, and this movement is driven by pneumatic pressure.

[0045] The danger ramp 130 is configured to adapt to the reverse movement path of the valve stem 200, and this movement is driven by an elastic force;

[0046] The axial projection length of the dangerous inclined plane 130 is greater than the axial projection length of the safe inclined plane 140.

[0047] It should be noted here that the distinction between the safety ramp 140 and the danger ramp 130 is based on the driving force when the valve stem 200 moves. Specifically:

[0048] When the valve stem 200 moves forward, it is driven by air pressure and accelerates quickly. The sealing ring 210 on the valve stem 200 can cut into the sealing surface 120 at high speed to achieve sealing, so there is no risk of the ring jumping out.

[0049] When the valve stem 200 moves in the reverse direction, it is reset by elastic force, resulting in a slower movement speed. This causes the sealing ring 210 to slide slowly along the inclined surface to the sealing surface 120. During this process, the front of the sealing ring 210 is under high pressure, while the rear is open to the atmosphere. The high pressure difference between the two sides causes the gas to flow at high speed through the installation gap between the sealing ring 210 and the valve body 100, creating a negative pressure zone behind the sealing ring 210. At the same time, the high pressure gas in front of the sealing ring 210 extends into the inner diameter area of ​​the sealing ring 210, causing it to expand outward. Combined with the friction between the sealing ring 210 and the inclined surface, this ultimately causes the sealing ring 210 to jump out of the ring. The closer the sealing ring 210 is to the sealing surface 120, the easier it is for it to jump out of the ring.

[0050] Therefore, the inclined plane that the sealing ring 210 passes through when the valve stem 200 is moved by pneumatic pressure is defined as the safe inclined plane 140, and the inclined plane that the sealing ring 210 passes through when the valve stem 200 is moved by elastic force is defined as the dangerous inclined plane 130.

[0051] In this embodiment, by extending the axial projection length of the dangerous inclined plane 130, i.e., the overall length of the dangerous inclined plane 130 is greater than the length of the safe inclined plane 140, and at least a portion of the slope of the dangerous inclined plane 130 is less than the slope of the safe inclined plane 140, the climbing process of the sealing ring 210 during reverse movement is made smoother. This design brings at least the following beneficial effects:

[0052] 1. Slow down the airflow speed to reduce the negative pressure effect on the back pressure side.

[0053] During the reverse reset (closing) process of valve stem 200, the front of sealing ring 210 is high-pressure gas and the rear is low-pressure or atmospheric environment. Gas is prone to flow at high speed from the sealing gap, forming a local negative pressure zone and generating a backward "suction force", which aggravates the risk of ring jump. By extending the dangerous slope 130 and reducing its slope, the rate of force change of sealing ring 210 approaching sealing surface 120 is significantly slowed down, the gas flow rate is reduced, the formation strength of negative pressure zone is weakened, and the axial instability of sealing ring 210 caused by negative pressure suction is effectively suppressed.

[0054] 2. Reduce friction and decrease the axial component of the force on the back pressure side.

[0055] By adopting a gentler slope design, the normal pressure between the sealing ring 210 and the valve body 100 is reduced, thereby reducing the sliding friction. At the same time, due to the reduced slope angle, the axial component force F1 acting on the back pressure side of the sealing ring 210 is also reduced, avoiding the tendency of this component force F1 to push the sealing ring 210 outward from the valve stem 200 mounting groove, and further improving axial stability.

[0056] 3. Increase the radial downward pressure (guide clamping force) of the inclined surface on the sealing ring 210.

[0057] A sloped surface with a smaller gradient can reduce the axial component force F1 on the back pressure side, and more effectively convert part of the axial motion tendency into a downward pressure F2 on the outer edge of the sealing ring 210, thereby enhancing its fitting stability in the groove of the valve stem 200, reducing the gap between the sealing ring 210 and the valve stem 200, and thus reducing the entry of high-pressure gas into the inner diameter area of ​​the sealing ring 210, preventing radial outward expansion and groove dislodgement due to internal pressure expansion.

[0058] Specifically, the structure of the dangerous slope 130 is described below:

[0059] The dangerous inclined surface 130 is configured in a multi-segment structure and includes at least a first inclined surface segment 131 and a second inclined surface segment 132. The first inclined surface segment 131 is connected to the vent surface 110, and the second inclined surface segment 132 is connected to the sealing surface 120.

[0060] The slope of the first inclined plane segment 131 is the same as the slope of the safety inclined plane 140. The slope of the second inclined plane segment 132 is less than the slope of the first inclined plane segment 131. There is a transition step 133 between the first inclined plane segment 131 and the second inclined plane segment 132. The transition step 133 is connected to the first inclined plane segment 131 and the second inclined plane segment 132 by a rounded corner. The transition step 133 can be set as a plane or an inclined plane. When the transition step 133 is set as an inclined plane, its slope is less than the slope of the second inclined plane segment 132.

[0061] As a preferred option, in this embodiment, the transition step 133 is set as a plane. When the sealing ring 210 moves from the first inclined section 131 to the transition step 133, its outer edge suddenly loses the inclined support and enters a straight area with stronger radial constraint. At this time, the wall of the valve body 100 generates an instantaneous vertical downward pressure F2 on the sealing ring 210, forcing the sealing ring 210 to converge inward and stick tightly to the surface of the valve stem 200. This "downward pressure effect" suppresses its radial expansion trend, effectively reducing the fit gap between the sealing ring 210 and the valve stem 200 mounting groove, thereby significantly reducing the possibility of high-pressure gas seeping into the inner diameter area of ​​the sealing ring 210 from the outside.

[0062] Since internal pressure expansion is one of the key factors causing "ring jump", reducing gas intrusion can fundamentally weaken the power source of the seal ring 210 flipping outward and improve its stability under high pressure differential conditions.

[0063] Subsequently, when the sealing ring 210 leaves the transition step 133 and enters the second inclined section 132, since the second inclined section 132 is relatively gentle, the axial force F1 on the back side of the sealing ring 210 caused by friction decreases after entering the second inclined section 132, while the downward pressure F2 on the sealing ring 210 increases, which plays a role in preventing the ring from jumping.

[0064] like Figures 3-5As shown, this utility model also provides a solenoid valve, comprising:

[0065] Valve body 100, which has the valve body main hole structure of the anti-jump ring mentioned above;

[0066] The valve stem 200 is provided with a sealing ring 210. As the valve stem 200 moves, the sealing ring 210 switches between the vent surface 110 and the sealing surface 120 to open or close the airflow channel.

[0067] The pneumatic push plate 220 and the return spring 230 are located on both sides of the valve stem 200. The pneumatic pressure drives the pneumatic push plate 220 to move to push the valve stem 200 to move in the forward direction, and the return spring 230 provides the elastic force to push the valve stem 200 to move in the reverse direction.

[0068] During operation, when the solenoid valve is opened in the forward direction, the air pressure pushes the air push plate 220 to drive the valve stem 200 forward, and the sealing ring 210 slides smoothly along the safety slope 140 to achieve rapid valve opening.

[0069] During the closing process, after the air pressure is released, the return spring 230 drives the valve stem 200 to move in the opposite direction, and the sealing ring 210 gradually retracts along the extended and gently sloping danger ramp 130. Because the danger ramp 130 adopts a multi-segment structure and is equipped with a transition step 133, the sealing ring 210 is subjected to gentle force during the climbing process, and is vertically pressed down by the transition step 133 before entering the second ramp segment 132, effectively compressing the gap between it and the valve stem 200, inhibiting high-pressure gas from intruding into the inner diameter area, thereby significantly reducing the risk of "ring skipping" caused by the combined effect of internal pressure expansion and back pressure / negative pressure.

[0070] This solenoid valve achieves high-reliability sealing under high pressure differential and frequent opening and closing conditions by optimizing the main hole structure of the valve body without changing the driving principle and basic configuration. This improves the product's service life and operational stability, making it particularly suitable for applications with high safety requirements, such as industrial automation and pneumatic control systems.

[0071] Example 2

[0072] like Figures 2-5 As shown, the difference between Embodiment 2 and Embodiment 1 is that Embodiment 2 provides another structure for the dangerous inclined plane 130.

[0073] In Embodiment 2, the dangerous ramp 130 is designed as a single-segment structure. Although this design eliminates the transition step 133 in the multi-segment structure, by reducing the overall inclination angle of the ramp, the stress state can still be effectively improved during the reverse movement of the sealing ring 210 along the dangerous ramp 130. On the one hand, it reduces the axial component force F1 of the high-pressure gas acting on the back side of the sealing ring 210, reducing its tendency to come off backward. On the other hand, it increases the radial downward pressure F2 of the ramp of the valve body 100 on the sealing ring 210, enhancing the radial constraint effect on the sealing ring 210 and suppressing its outward deformation caused by internal pressure expansion. Thus, while simplifying the structure, it achieves an effective anti-jumping ring function.

[0074] Under this design, the inclination angle of the dangerous ramp 130 should be controlled to ≤30°. When the slope is within this range, the axial component force F1 is significantly reduced, the downward pressure F2 is relatively enhanced, the force on the sealing ring 210 tends to be stable, and it can maintain good fit and guidance throughout the entire return stroke. This single-stage structure not only reduces the processing complexity and improves production consistency, but is also suitable for solenoid valve products with high space compactness requirements. Under the premise of ensuring anti-jumping ring performance, it provides a more cost-effective and process-feasible solution.

[0075] The technical means disclosed in this utility model are not limited to those described above, but also include technical solutions composed of any combination of the above technical features. The above are specific embodiments of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications are also considered within the scope of protection of this utility model.

[0076] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0077] Furthermore, in this utility model, the use of terms such as "first," "second," and "a" is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. The terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two elements or the interaction between two elements, unless otherwise explicitly specified. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0078] The technical solutions of the various embodiments of this utility model can be combined with each other, but only if they can be implemented by those skilled in the art. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the protection scope claimed by this utility model.

[0079] The specific embodiments described herein are merely illustrative examples illustrating the spirit of this utility model. Those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A valve body main hole structure with an anti-jump ring, characterized in that, include: The valve body main hole has an inner wall with an air hole surface and a sealing surface spaced apart, and the air hole surface and the sealing surface are connected by a bevel transition. The inclined surfaces located on both sides of the vent surface include a dangerous inclined surface and a safe inclined surface. The sealing surface connected to the dangerous inclined surface and the sealing surface connected to the safe inclined surface are at the same height. The safety ramp is configured to adapt to the positive movement path of the valve stem, and this movement is driven by air pressure. The dangerous ramp is configured to adapt to the reverse movement path of the valve stem, and this movement is driven by an elastic force. The axial projection length of the dangerous inclined plane is greater than the axial projection length of the safe inclined plane.

2. The valve body main hole structure for the anti-jump ring according to claim 1, characterized in that, The dangerous inclined surface is arranged in a multi-segment structure and includes at least a first inclined surface segment and a second inclined surface segment. The first inclined surface segment is connected to the vent surface, and the second inclined surface segment is connected to the sealing surface.

3. The valve body main hole structure for the anti-jump ring according to claim 2, characterized in that, The slope of the first inclined plane segment is the same as the slope of the safety inclined plane.

4. The valve body main hole structure for the anti-jump ring according to claim 2, characterized in that, The slope of the second inclined plane segment is less than the slope of the first inclined plane segment.

5. The valve body main hole structure for the anti-jump ring according to claim 2, characterized in that, There is a transition step between the first inclined section and the second inclined section, and the transition step is connected to the first inclined section and the second inclined section by a rounded corner.

6. The valve body main hole structure for the anti-jump ring according to claim 5, characterized in that, The transition steps are configured as either planes or slopes.

7. The valve body main hole structure for an anti-jump ring according to claim 6, characterized in that, When the transition step is set as an inclined plane, its inclination direction is the same as that of the first inclined plane segment and the second inclined plane segment.

8. The valve body main hole structure for the anti-jump ring according to claim 7, characterized in that, When the transition step is set as an inclined plane, its slope is less than the slope of the second inclined plane segment.

9. The valve body main hole structure for the anti-jump ring according to claim 1, characterized in that, The dangerous inclined plane is designed as a single-segment structure, and its slope is less than that of the safe inclined plane.

10. A solenoid valve, characterized in that, include: The valve body has a valve body main hole structure with an anti-jump ring as described in any one of claims 1-9 above; A valve stem is provided with a sealing ring. As the valve stem moves, the sealing ring switches between the vent surface and the sealing surface to open or close the airflow channel. A pneumatic push plate and a return spring are located on opposite sides of the valve stem. The pneumatic push plate is used to push the valve stem to move forward, and the return spring is used to push the valve stem to move in the opposite direction.

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