Flow-improved pneumatic electromagnetic valve

Abstract

The invention discloses a flow-improved pneumatic electromagnetic valve, and belongs to the technical field of electromagnetic valves. Comprising a valve body, the valve body is provided with a main hole formed in the axis direction, a plurality of valve body sealing grooves are formed in the main hole at intervals, and openings in the two ends of each valve body sealing groove are in transition through cambered surfaces and form valve body transition fillets; the valve rod can be movably arranged in the main hole in the axial direction, a plurality of sets of sealing parts which are arranged in an outwards-protruding mode are arranged on the peripheral wall of the valve rod at intervals, one set of sealing parts is composed of two annular protruding parts, a gap is reserved between the two annular protruding parts, a valve rod sealing groove is formed between the two annular protruding parts, and the outer edges of the annular protruding parts are in arc surface transition and form valve rod transition fillets; and the distance between the outermost convex point of the transition fillet of the valve body and the outermost convex point of the transition fillet of the valve rod is the shortest linear distance, and a through-flow section for gas to pass through is formed between the outermost convex point of the transition fillet of the valve body and the outermost convex point of the transition fillet of the valve rod. Through the design of the valve body transition fillets, the through-flow section is enlarged under the condition that the size of the electromagnetic valve is not changed, and therefore higher flow is obtained.

Description

Technical Field

[0001] The invention belongs to the technical field of solenoid valves, and in particular relates to a flow-improved pneumatic solenoid valve. Background Art

[0002] Directional control solenoid valves are key components in many automation systems, and their performance directly affects the efficiency and capacity of the entire system. When selecting and using solenoid valves, several key technical indicators need to be considered: width, flow, response time, and opening and closing pressure. Among them, there is a positive correlation between the width of the solenoid valve and the flow, that is, the larger the width, the greater the theoretically achievable flow, which means it can drive a larger load.

[0003] However, increasing the width will also require more installation space, which is not ideal in many application scenarios, especially for fields such as the semiconductor industry, which tends to prefer smaller solenoid valves.

[0004] The 4V200 series solenoid valves currently on the market have a width of 22mm and a flow rate of 1000L / min, while the 4V100 series provides a flow rate of 600L / min with a width of 18mm. In view of the limited installation space, manufacturers are committed to increasing the flow rate while maintaining or reducing the width of the solenoid valve. Summary of the invention

[0005] The present invention aims at the above problems existing in the prior art and proposes a flow-improved pneumatic solenoid valve with compact structure and large flow rate.

[0006] The present invention can be achieved through the following technical solutions:

[0007] A flow-improved pneumatic solenoid valve, comprising:

[0008] The valve body has a main hole opened along the axial direction, and a plurality of valve body sealing grooves are arranged at intervals on the main hole. The openings at both ends of the valve body sealing grooves are transitioned through arc surfaces to form valve body transition fillets;

[0009] The valve stem is movably arranged in the main hole along the axial direction, and a plurality of groups of sealing parts with outward protrusions are arranged at intervals on the outer peripheral wall of the valve stem, and one group of the sealing parts is composed of two annular protrusions, and a gap is left between the two annular protrusions to form a valve stem sealing groove, and the outer edge of the annular protrusion is transitioned through an arc surface to form a valve stem transition fillet, wherein,

[0010] The most outwardly convex point of the transition fillet of the valve body and the most outwardly convex point of the transition fillet of the valve stem are the shortest straight-line distances therebetween, and form a flow cross section for gas to pass through.

[0011] As a further improvement of the present invention, a first sealing member is provided in the valve stem sealing groove, and when the annular protrusion is located in the valve body sealing groove, the first sealing member is sealingly connected to the inner wall of the valve body sealing groove.

[0012] As a further improvement of the present invention, the outer end surface of the first sealing member is configured as a Gothic arc surface.

[0013] As a further improvement of the present invention, the inner end surface of the first sealing member is arranged in an arc surface and forms an inner sealing arc surface.

[0014] As a further improvement of the present invention, a groove is provided on the side surface of the first sealing member.

[0015] As a further improvement of the present invention, a protrusion is further provided on the side surface of the first sealing member, and the protrusion is close to the inner sealing arc surface.

[0016] As a further improvement of the present invention, the annular protrusion is further provided with an arcuate surface, and the valve stem transition fillet is transitionally connected to the outer peripheral wall of the valve stem through the arcuate surface.

[0017] As a further improvement of the present invention, electromagnetic end covers and end covers are respectively installed at both ends of the valve body, wherein:

[0018] A piston is arranged in the electromagnetic end cover, a first spring is arranged in the end cover, and two ends of the valve stem are respectively in contact with the piston and the first spring.

[0019] As a further improvement of the present invention, the electromagnetic end cover is connected to a pilot valve, wherein:

[0020] When the pilot valve is energized, air flows into the electromagnetic end cover through the pilot valve and pushes the piston to move, thereby driving the valve stem to move;

[0021] When the pilot valve is de-energized, the airflow no longer pushes the piston forward, and the valve stem and the piston are reset under the action of the first spring.

[0022] As a further improvement of the present invention, the valve body has an air inlet, a first working port, and a second working port, wherein:

[0023] When the pilot valve is powered off, the air inlet is connected to the first working port;

[0024] When the pilot valve is energized, the valve stem moves to the air inlet to communicate with the second working port.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] 1. Optimized flow cross section and large flow rate: Through the design of the valve body transition fillet, the flow cross section is expanded without changing the volume of the solenoid valve, thereby obtaining a higher flow rate, which not only improves the working efficiency of the solenoid valve, but also enhances its performance in practical applications.

[0027] 2. Extend the life of the solenoid valve: Considering that the first seal on the valve stem will move along the transition radius of the valve body during the switching process of the solenoid valve, the design of the transition radius of the valve body can reduce wear and tear, thereby increasing the service life of the solenoid valve.

[0028] 3. Considering both valve stem strength and flow rate: The design of the valve stem transition fillet reduces the width of the annular convex part along its axial direction, further expanding the area of ​​the flow cross section between it and the valve body transition fillet, thereby increasing the flow rate of the solenoid valve. At the same time, the design of the inner sealing arc surface on the annular convex part ensures the strength of the valve stem and prevents failure caused by high-pressure gas or long-term use.

[0029] 4. Enhanced sealing and reliability: The outer end face of the first seal is set as a Gothic arc surface, which ensures good sealing and reduces friction, reducing the wear of the seal. At the same time, the groove structure of the first seal can automatically compensate for the interference, thereby improving the reliability and durability of the seal.

[0030] 5. Double sealing effect: The inner end face of the first seal is arranged in an arc surface and forms an inner sealing arc surface, and a protrusion is also provided on the side of the first seal. At this time, the sealing arc surface of the first seal forms the first sealing defense line, and the protrusion forms the second sealing defense line. Through the coordinated use of the protrusion and the inner sealing arc surface, a double sealing guarantee is formed to ensure the sealing performance between the valve stem and the first seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 1 is a schematic structural diagram of a flow-improved pneumatic solenoid valve according to a first embodiment of the present invention;

[0032] Figure 2 is a cross-sectional view of a flow-improved pneumatic solenoid valve according to Embodiment 1 of the present invention;

[0033] Figure 3 The present invention Figure 2 A partial enlarged view of the middle A;

[0034] Figure 4 is a cross-sectional view of a valve body according to a first embodiment of the present invention;

[0035] Figure 5 is a cross-sectional view of an electromagnetic end cover of the present invention;

[0036] Figure 6 is a cross-sectional view of a first sealing member of the present invention;

[0037] Figure 7 is a schematic structural diagram of a first sealing member of the present invention;

[0038] Figure 8 is a cross-sectional view of a flow-improved pneumatic solenoid valve according to a second embodiment of the present invention;

[0039] Fig. 9 is a cross-sectional view of a flow-improved pneumatic solenoid valve according to a third embodiment of the present invention;

[0040] Fig.10 It is a schematic diagram of the flow cross section of a pneumatic solenoid valve in the prior art.

[0041] In the figure, 100, valve body; 101, air inlet; 102, first working port; 103, second working port; 110, valve body sealing groove; 111, valve body transition fillet; 1111, straight portion; 120, valve stem; 121, annular convex portion; 1211, valve stem transition fillet; 1212, arc surface; 122, second spring; 130, valve stem sealing groove; 140, first sealing member; 141, Gothic arc surface; 142, inner sealing arc surface; 143, protrusion; 144, groove; 150, second sealing member; 160, electromagnetic end cover; 161, piston; 170, end cover; 171, first spring; 180, pilot valve. DETAILED DESCRIPTION

[0042] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical method of the present invention, but the present invention is not limited to these embodiments.

[0043] Embodiment 1

[0044] like Figure 1-7 As shown, embodiment 1 provides a flow-improved pneumatic solenoid valve, which is a single-electrically controlled solenoid valve, including:

[0045] The valve body 100 has a main hole opened along the axial direction, and a plurality of valve body sealing grooves 110 are arranged at intervals on the main hole. The openings at both ends of the valve body sealing grooves 110 are transitioned through arc surfaces to form valve body transition fillets 111;

[0046] The valve stem 120 is movably arranged in the main hole along the axial direction. A plurality of groups of sealing parts with outward protrusions are arranged at intervals on the outer peripheral wall of the valve stem 120. One group of sealing parts is composed of two annular protrusions 121, and a gap is left between the two annular protrusions 121 to form a valve stem sealing groove 130. The outer edge of the annular protrusion 121 is transitioned through an arc surface to form a valve stem transition fillet 1211, wherein,

[0047] The shortest straight-line distance between the valve body transition fillet 111 and the valve stem transition fillet 1211 forms a flow cross section for gas to pass through.

[0048] It should be noted that if Fig.10 As shown, in the prior art, the opening of the valve body sealing groove 110 is transitionally connected to the inner wall of the ventilation channel through an inclined surface. In this case, the distance between the valve stem 120 and the inclined surface is the flow cross section.

[0049] In comparison, Figure 3 As shown, the valve body 100 provided in this embodiment cancels the setting of the inclined surface. At this time, the size of the flow cross-section formed between the valve body transition fillet 111 and the valve stem transition fillet 1211 is larger than the size of the flow cross-section formed between the valve stem 120 and the inclined surface in the prior art, thereby increasing the flow rate of the solenoid valve in the case of solenoid valves of the same size.

[0050] It is also worth mentioning that the setting of the valve stem transition fillet 1211 reduces the width of the annular protrusion 121 along its axial direction, further expanding the area of ​​the flow cross-section between it and the valve body transition fillet 111, thereby increasing the flow rate of the solenoid valve. However, the reduction in width will lead to a decrease in its strength. To solve this problem, the outer side surface of the annular protrusion 121 is set to an arc surface 1212, and the valve stem transition fillet 1211 is transitionally connected to the outer peripheral wall of the valve stem 120 through the arc surface 1212, thereby achieving the purpose of supplementing strength and preventing the solenoid valve from failing when passing high-pressure gas or during its service life.

[0051] In addition, if Figure 3 As shown, the valve body transition fillet 111 has a straight portion 1111, and both ends of the straight portion 1111 are transitionally connected to the inner wall of the valve body 100 through arc surfaces. The angle between the straight portion and the inner wall of the valve body sealing groove 130 is in the range of 35°-50°. Under this angle design, the size of the flow cross-section can be further expanded, thereby ensuring the maximum flow rate, while guiding the gas to pass through the flow cross-section more smoothly, thereby improving the overall fluid dynamics performance.

[0052] In actual application, the 18mm wide large flow solenoid valve can replace the 22mm wide 4V200 series solenoid valve. It has a compact structure, smaller size, and increased flow.

[0053] Preferably, a first seal 140 is provided in the valve stem sealing groove 130. When the annular protrusion 121 is located in the valve body sealing groove 110, the first seal 140 is sealed and connected to the inner wall of the valve body sealing groove 110. It is worth mentioning that when the solenoid valve is switched, as the valve stem 120 moves, the first seal 140 will enter the valve body sealing groove 110 along the valve body transition radius 111 to seal the channel. In this process, due to the setting of the valve body transition radius 111, the resistance of the first seal 140 when passing through can be reduced, thereby extending the life of the solenoid valve.

[0054] Preferably, Figure 6 As shown, the outer end face of the first seal 140 is set to a Gothic arc surface 141. The shape of the Gothic arc surface 141 is different from the traditional arc surface. It is formed by the intersection of two symmetrical arcs, and the intersection of the arcs forms the apex of the pointed arch. The center distance between the two intersecting arcs of the Gothic arc surface 141 is between 0.05-0.15mm. At this time, the apex of the pointed arch can ensure that the pressure is not too large while ensuring the sealing performance, that is, the contact area between the first seal 140 and the valve body sealing groove 110 is only concentrated at the location of the apex of the pointed arch, thereby reducing the friction force when the first seal 140 and the valve body sealing groove 110 produce relative sliding, thereby extending the service life of the first seal.

[0055] Preferably, the inner end face of the first seal 140 is arranged in an arc surface and forms an inner sealing arc surface 142, and the side of the first seal 140 is also provided with a protrusion 143, and the protrusion 143 is close to the inner sealing arc surface 142. At this time, the sealing arc surface of the first seal 140 forms a first sealing defense line, and the protrusion 143 forms a second sealing defense line. Through the coordinated use of the protrusion 143 and the inner sealing arc surface 142, a double sealing guarantee is formed to ensure the sealing performance between the valve stem 120 and the first seal 140.

[0056] Preferably, a groove 144 is provided on the side of the first seal 140 (the groove 144 is located in the thickness direction of the first seal 140). It should be noted here that during the long life test of the solenoid valve, the pressure of the first seal 140 will gradually decrease due to its wear. At this time, the groove 144 can automatically compensate for the interference. Under the action of air pressure, the groove 144 will automatically widen the first seal 140 along its width direction, thereby ensuring the sealing performance.

[0057] Specifically, Figure 3As shown, when the valve stem 120 moves to the right, the first seal 140 contacts the valve body sealing groove 110 and creates a seal. Due to the friction generated on the contact surface of the two, the end of the Gothic arc surface 141 of the first seal 140 is tilted to the left. At this time, part of the gas will enter along the gap between the right side of the first seal 140 and the annular protrusion 121, and enter the groove 144 located on the right side of the first seal 140. Under the action of the airflow, the front end part of the groove 144 on the right side of the first seal 140 will be pushed to extend outward, so that the first seal 140 is "stretched", thereby compensating for the worn part of the Gothic arc surface 141, thereby extending the service life of the first seal 140.

[0058] In addition, the valve stem 120 is provided with a second sealing member 150 near both ends. The second sealing member 150 is used to seal the two outermost valve body sealing grooves 110 of the valve body 100 to ensure that gas does not leak.

[0059] Preferably, the two ends of the valve body 100 are respectively installed with an electromagnetic end cover 160 and an end cover 170, wherein:

[0060] A piston 161 is disposed in the electromagnetic end cover 160 , a first spring 171 is disposed in the end cover 170 , and two ends of the valve stem 120 abut against the piston 161 and the first spring 171 respectively.

[0061] Preferably, the electromagnetic end cover 160 is connected to a pilot valve 180, wherein:

[0062] When the pilot valve 180 is energized, the airflow flows into the electromagnetic end cover 160 through the pilot valve 180 and pushes the piston 161 to move, thereby driving the valve stem 120 to move;

[0063] When the pilot valve 180 is de-energized, the airflow no longer pushes the piston 161 forward, and the valve stem 120 and the piston 161 are reset under the action of the first spring 171 .

[0064] Preferably, the valve body 100 has an air inlet 101, a first working port 102, and a second working port 103, wherein:

[0065] When the pilot valve 180 is de-energized, the air inlet 101 is connected to the first working port 102;

[0066] When the pilot valve 180 is energized, the valve stem 120 moves to the air inlet 101 to communicate with the second working port 103 .

[0067] Specifically, the action process of the solenoid valve is described as follows:

[0068] 1. When the pilot valve 180 is in a power-off state, the valve stem 120 is at the left side under the action of the first spring 171. At this time, the gas in the solenoid valve air inlet 101 is connected to the first working port 102, that is, the actuator driven by the first working port 102 works;

[0069] 2. When the pilot valve 180 is energized, the piston 161 in the electromagnetic end cover 160 pushes the valve stem 120 to move toward one end of the end cover 170 and stop, thereby connecting the gas in the electromagnetic valve air inlet 101 to the second working port 103, that is, the actuator driven by the second working port 103 works.

[0070] Embodiment 2

[0071] like Figure 8 As shown, the difference between the second embodiment and the first embodiment is that the second embodiment provides a dual-electrically controlled solenoid valve, and both ends of the valve body 100 are installed with a solenoid end cover 160 and a pilot valve 180. Specifically, the action process is described as follows:

[0072] 1. When the pilot valve 180 on the left side of the solenoid valve is energized, the piston 161 of the left solenoid end cover 160 pushes the valve stem 120 to move rightward and stop, connecting the gas in the air inlet 101 to the second working port 103, that is, the actuator driven by the second working port 103 works;

[0073] 2. When the pilot valve 180 on the right side of the solenoid valve is energized, the piston 161203 of the right solenoid end cover 160 pushes the valve stem 120 to move leftward and stop, connecting the gas in the air inlet 101 to the first working port 102, that is, the actuator driven by the first working port 102 works.

[0074] Embodiment 3

[0075] like Fig. 9 As shown, the difference between the third embodiment and the first and second embodiments is that the third embodiment provides a 2x two-position three-position normally closed valve, and its action process is described as follows:

[0076] 1. When the pilot valves 180 on both sides lose power, the valve stem 120 on the left side is located on the left side under the action of the left second spring 122, and the valve stem 120 on the right side is located on the right side under the action of the right second spring 122. At this time, the gas in the air inlet 101 is sealed by the two second sealing members 150;

[0077] 2. When only the left pilot valve 180 is energized, the piston 161 in the left electromagnetic end cover 160 pushes the left valve stem 120 to move rightward and stop, that is, the gas in the air inlet 101 is connected to the second working port 103, and the actuator driven by the second working port 103 works;

[0078] 2. When only the right pilot valve 180 is energized, the piston 161 in the right electromagnetic end cover 160 pushes the right valve stem 120 to move leftward and stop, that is, the gas in the air inlet 101 is connected to the first working port 102, and the actuator driven by the first working port 102 works;

[0079] 4. When the pilot valves 180 on the left and right sides are energized, the piston 161 in the right electromagnetic end cover 160 pushes the right valve stem 120 to move to the left and stop, that is, the gas in the air inlet 101 is connected to the first working port 102, and the actuator driven by the first working port 102 works. At the same time, the piston 161 in the left electromagnetic end cover 160 pushes the left valve stem 120 to move to the right and stop, that is, the gas in the air inlet 101 is connected to the second working port 103, and the actuator driven by the second working port 103 works, that is, the gas in the air inlet 101 is connected to the first working port 102 and the second working port 103 at the same time, and can drive the actuators of the first working port 102 and the second working port 103 to work at the same time.

[0080] The technical means disclosed in the scheme of the present invention are not limited to the technical means disclosed in the above technical means, but also include technical schemes composed of any combination of the above technical features. The above is a specific implementation of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications are also regarded as the protection scope of the present invention.

[0081] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0082] In addition, in the present invention, descriptions such as ",","one", etc. are only used for descriptive purposes and cannot be understood as indicating or suggesting their relative importance or implicitly indicating the number of the indicated technical features. Therefore, features defined with "," may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0083] In the present invention, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0084] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in the field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

Claims

1. A flow-improved pneumatic solenoid valve, characterized in that: include: The valve body has a main hole opened along the axial direction, and a plurality of valve body sealing grooves are arranged at intervals on the main hole. The openings at both ends of the valve body sealing grooves are transitioned through arc surfaces to form valve body transition fillets; The valve stem is movably arranged in the main hole along the axial direction, and a plurality of groups of sealing parts with outward protrusions are arranged at intervals on the outer peripheral wall of the valve stem, and one group of the sealing parts is composed of two annular protrusions, and a gap is left between the two annular protrusions to form a valve stem sealing groove, and the outer edge of the annular protrusion is transitioned through an arc surface to form a valve stem transition fillet, wherein, The most outwardly convex point of the transition fillet of the valve body and the most outwardly convex point of the transition fillet of the valve stem are the shortest straight-line distances therebetween, and form a flow cross section for gas to pass through.

2. A flow-improved pneumatic solenoid valve according to claim 1, characterized in that: A first sealing member is provided in the valve stem sealing groove. When the annular protrusion is located in the valve body sealing groove, the first sealing member is sealed and connected to the inner wall of the valve body sealing groove.

3. A flow-improved pneumatic solenoid valve according to claim 2, characterized in that: The outer end surface of the first sealing member is configured as a Gothic arc surface.

4. A flow-improved pneumatic solenoid valve according to claim 2, characterized in that: The inner end surface of the first sealing member is arranged in an arc shape to form an inner sealing arc surface.

5. The flow-improved pneumatic solenoid valve according to claim 2, characterized in that: A groove is formed on the side surface of the first sealing member.

6. The flow-improved pneumatic solenoid valve according to claim 4, characterized in that: A protrusion is also provided on the side surface of the first sealing member, and the protrusion is close to the inner sealing arc surface.

7. A flow-improved pneumatic solenoid valve according to claim 1, characterized in that: The annular protrusion is also provided with an arcuate surface, and the valve stem transition fillet is transitionally connected to the outer peripheral wall of the valve stem through the arcuate surface.

8. A flow-improved pneumatic solenoid valve according to claim 1, characterized in that: The two ends of the valve body are respectively installed with an electromagnetic end cover and an end cover, wherein: A piston is arranged in the electromagnetic end cover, a first spring is arranged in the end cover, and two ends of the valve stem are respectively in contact with the piston and the first spring.

9. A flow-improved pneumatic solenoid valve according to claim 8, characterized in that: The electromagnetic end cover is connected to a pilot valve, wherein: When the pilot valve is energized, air flows into the electromagnetic end cover through the pilot valve and pushes the piston to move, thereby driving the valve stem to move; When the pilot valve is de-energized, the airflow no longer pushes the piston forward, and the valve stem and the piston are reset under the action of the first spring.

10. A flow-improved pneumatic solenoid valve according to claim 9, characterized in that: The valve body has an air inlet, a first working port, and a second working port, wherein: When the pilot valve is powered off, the air inlet is connected to the first working port; When the pilot valve is energized, the valve stem moves to the air inlet to communicate with the second working port.

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