Czochralski iron core stop type electromagnetic valve

Abstract

The utility model relates to the technical field of valve control, in particular to a straight pull iron core stop type electromagnetic valve, which comprises a static iron core, a movable iron core, a valve core, a plunger tube, a coil, a first spring, a valve sleeve component and a valve body, the plunger tube is a cylinder with two open ends, one end of the plunger tube is arranged in the coil, the other end of the plunger tube is arranged in the valve body, and the static iron core and the movable iron core are arranged in the plunger tube. The first spring provides downward force, the valve body comprises a first cavity and a second cavity which are communicated with each other and provided with an air outlet and an air inlet respectively, the valve element is in threaded connection with the movable iron core, the protruding structure makes contact with the sealing nozzle to form sealing, an air hole is formed in the valve element to communicate with the first blind hole and the second cavity, the coil is powered on to directly drive the movable iron core and the valve element to act, and a pilot air path is omitted. The structure is simplified, the production complexity and the machining difficulty are reduced, the stroke of the movable iron core is adjustable, the suction force is optimized, the sealing performance is ensured, the sealing parts are reduced through the simplified gas circuit structure, the leakage risk is reduced, and the production efficiency and the reliability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of valve control, in particular to a straight-pull iron core cut-off solenoid valve. Background Art

[0002] A solenoid valve is a device that uses electromagnetic control to achieve air or liquid flow. It is widely used in the field of industrial automation. Traditional solenoid valves mostly adopt a pilot structure, which controls the main valve through a pilot valve to achieve reversing. The working principle of the pilot solenoid valve is: the gas is divided into two paths from the air inlet, one path directly enters the working port for output, and the other path is input to the pilot valve through the designed pilot air channel. When the coil is energized, the pilot valve moving iron core moves to push the piston assembly, thereby driving the main valve spool to complete the reversing action.

[0003] However, this type of solenoid valve has a relatively complex structure due to the need for a pilot air path design, and requires the processing of multiple sealing parts, which increases processing and material costs. In addition, the moving iron core's stroke is greater than the valve core stroke, which is a necessary condition to ensure sealing performance. However, general solenoid valves cannot accurately adjust the moving iron core's stroke, resulting in an increase in the electromagnetic suction force requirements of the coil if the stroke is too large, and a small stroke may cause the valve core to not move in place, affecting the sealing performance and even causing functional failure. Therefore, strict control of the moving iron core stroke and high requirements for the processing accuracy of each component further increase the production difficulty and cost.

[0004] The information disclosed in this background technology section is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0005] The utility model provides a straight-pull iron core cut-off solenoid valve, thereby effectively solving the problems in the background technology.

[0006] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a straight-pull iron core stop-type solenoid valve, comprising: a static iron core, a movable iron core, a valve core, a magnetic isolation tube, a coil, a first spring, a valve sleeve assembly and a valve body;

[0007] The magnetic isolation tube is a cylindrical structure with two ends open, including a first through hole and a first blind hole. One end of the magnetic isolation tube is arranged in the coil, and the other end is arranged in the valve body. The static iron core and the movable iron core are arranged in the first through hole from top to bottom. The first spring is arranged between the static iron core and the movable iron core for applying a downward force to the movable iron core.

[0008] The valve body includes a first cavity and a second cavity that are interconnected, an air outlet that is connected to the first cavity is provided on the side wall of the valve body, and an air inlet that is connected to the second cavity is provided on the side wall of the valve body;

[0009] The valve sleeve assembly is arranged in the first cavity, one end of the valve core is connected to the moving iron core, and the other end is arranged in the valve sleeve assembly; a protrusion structure is radially provided on the end of the valve core, which contacts the sealing mouth of the valve sleeve assembly to form a seal; an air hole is provided inside the valve core to connect the first blind hole and the second cavity, and the moving iron core and the valve core are controlled to move up and down by turning on and off the power of the coil to realize the opening and closing of the air outlet.

[0010] Furthermore, an adjusting member is provided on a side of the valve core close to the moving iron core.

[0011] Furthermore, the adjusting member is one of a hexagonal nut, a butterfly nut, and a knurled nut.

[0012] Furthermore, a soft rubber layer is provided on the surface of the protruding structure.

[0013] Furthermore, the valve sleeve assembly includes an upper valve sleeve, a middle valve sleeve and a lower valve sleeve arranged in sequence, and the end face of the upper valve sleeve is arranged at the end of the magnetic isolation tube, so that the first blind hole forms an accommodating space; the middle valve sleeve and the lower valve sleeve are radially provided with multiple through holes for communicating with the first cavity.

[0014] Furthermore, the middle valve sleeve and the lower valve sleeve are provided with sealing nozzles on both sides close to the upper and lower end surfaces of the protruding structure, and the sealing nozzles are annular conical protrusions.

[0015] Furthermore, the side wall of the valve body is provided with an exhaust port communicating with the first cavity, and the end of the exhaust port is provided with a platform muffler.

[0016] Furthermore, the air inlet and the air outlet are arranged to be inclined with the inner side higher and the outer side lower.

[0017] Furthermore, it also includes a bottom cover manual rod, the bottom cover is arranged at the end of the second cavity, the bottom cover is provided with a countersunk hole inside, the manual rod is provided with a first diameter section, a second diameter section and a third diameter section in sequence, and the third diameter section is larger than the second diameter section and larger than the first diameter section, the manual rod passes through the countersunk hole so that the third diameter section is arranged in the countersunk hole, and the second diameter section is radially provided with a pin to prevent the manual rod from falling off.

[0018] Furthermore, a second spring is sleeved on the first diameter section, and an end portion of the second spring acts on the valve core to provide an upward elastic force for the valve core.

[0019] The beneficial effects of the utility model are:

[0020] The utility model eliminates the pilot valve structure and adopts a cut-off structure in which the moving iron core directly pulls the valve core. The coil is energized to directly act on the moving iron core, so that the moving iron core and the valve core move in an integrated manner to realize the opening and closing of the solenoid valve. There is no need to design a pilot air path, which simplifies the processing steps and reduces the production complexity.

[0021] The movable iron core of the utility model is connected to the valve core by threads, and the stroke of the movable iron core can be adjusted within a certain range to optimize the control of the electromagnetic attraction force while ensuring the sealing performance, effectively reducing the processing difficulty and cost and improving production efficiency; due to the simplification of the overall air path structure, the parts of the solenoid valve that need to be sealed are significantly reduced, further reducing the risk of leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0023] Figure 1 This is a structural diagram of a straight-pull iron core stop-type solenoid valve;

[0024] Figure 2 For Figure 1 A partial enlarged view of point A in the middle;

[0025] Figure 3 This is a structural diagram of a direct-pull iron core stop-type solenoid valve (coil not energized);

[0026] Figure 4 This is a structural diagram of a direct-pull iron core stop-type solenoid valve (coil energized state);

[0027] Figure 5 This is an exploded view of a straight-pull iron core stop solenoid valve.

[0028] Figure markings: 1. static iron core; 2. moving iron core; 3. valve core; 31. protruding structure; 32. air hole; 33. adjusting part; 4. magnetic isolation tube; 41. first through hole; 42. first blind hole; 5. coil; 6. first spring; 7. valve sleeve assembly; 71. upper valve sleeve; 72. middle valve sleeve; 73. lower valve sleeve; 731. sealing nozzle; 732. through hole; 8. valve body; 81. first cavity; 811. air outlet; 812. exhaust port; 813. platform silencer; 82. second cavity; 821. air inlet; 83. bottom cover; 84. manual lever; 841. first diameter section; 842. second diameter section; 843. third diameter section; 844. pin; 9. second spring. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0030] In the description of the present invention, it should be noted that the orientations or positional relationships indicated by “center”, “up”, “down”, “left”, “right”, “vertical”, “horizontal”, “inside” and “outside” are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0031] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integrated connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0032] like Figures 1 to 5 As shown: A straight-pull iron core stop type solenoid valve, comprising: a static iron core 1, a moving iron core 2, a valve core 3, a magnetic isolation tube 4, a coil 5, a first spring 6, a valve sleeve assembly 7 and a valve body 8;

[0033] The magnetic isolation tube 4 is a cylindrical structure with two ends open, including a first through hole 41 and a first blind hole 42. One end of the magnetic isolation tube 4 is disposed within the coil 5, and the other end is disposed within the valve body 8. The static iron core 1 and the movable iron core 2 are disposed vertically within the first through hole 41, with a gap provided between the end surfaces of the static iron core 1 and the movable iron core 2. A first spring 6 is disposed between the static iron core 1 and the movable iron core 2 to apply a downward force to the movable iron core 2.

[0034] The valve body 8 is provided with a stepped hole structure that is narrow in the middle and wide at both ends. The stepped hole structure divides the interior of the valve body 8 into a first cavity 81 and a second cavity 82, and the first cavity 81 and the second cavity 82 are connected. The side wall of the valve body 8 is provided with an air outlet 811 connected to the first cavity 81, and the side wall of the valve body 8 is provided with an air inlet 812 connected to the second cavity 82.

[0035] The valve sleeve assembly 7 is arranged in the first cavity 81, one end of the valve core 3 is connected to the moving iron core 2, preferably screwed, and the other end is arranged in the valve sleeve assembly 7; a protrusion structure 31 is radially provided on the end of the valve core 3, and the sealing mouth 731 of the valve sleeve assembly 7 contacts to form a seal; an air hole 32 is provided inside the valve core 3, and the air hole 32 connects the first blind hole 42 and the second cavity 82, and the power is turned on and off by the coil 5 to control the up and down movement of the moving iron core 2 and the valve core 3 to realize the opening and closing of the air outlet 811.

[0036] Specifically, such as Figure 3 As shown, when the solenoid valve is in a normal, unpowered state, gas enters from the air inlet 821, flows through the air hole 32 of the valve core 3 to the first blind hole 42 of the magnetic isolation tube 4, and forms a gas balance state. At this time, the elastic force applied by the first spring 6 keeps the moving iron core 2 in a stationary state, and pushes the sealing surface of the valve core 3 to contact the sealing nozzle 731 of the valve sleeve assembly 7, thereby achieving sealing and closing the air outlet 811.

[0037] When the solenoid valve coil 5 is energized, Figure 4 As shown, the suction force generated by the electromagnetic coil 5 acts on the moving iron core 2, sucking the moving iron core 2 toward the static iron core 1. Since the moving iron core 2 and the valve core 3 are connected by threads, the two move upward as a whole. At this time, the electromagnetic suction force is greater than the elastic force of the first spring 6 and the overall gravity of the iron core and the valve core 3, so that the sealing surface of the valve core 3 is away from the sealing mouth 731 of the valve sleeve assembly 7, and the air inlet 821 is connected to the air outlet 811, so that the air outlet 811 is open.

[0038] After the solenoid valve loses power, the coil 5 no longer generates attraction force, and the moving iron core 2 is reset under the action of the first spring 6 and separated from the static iron core 1. When the moving iron core 2 is reset, it drives the valve core 3 to move downward together, and the sealing surface of the valve core 3 contacts the sealing mouth 731 of the valve sleeve assembly 7 again to achieve sealing and close the air outlet 811. The solenoid valve realizes automatic control of the airflow through the above-mentioned power-on and power-off cycle.

[0039] Continue to refer Figure 3, the gap between the end faces of the static iron core 1 and the moving iron core 2, the stroke of the moving iron core 2 is expressed as H1, the gap between the raised upper end face of the valve core 3 and the valve sleeve assembly 7 is the valve core 3 moving stroke is expressed as H2, in order to ensure the sealing requirements of the product, it is necessary to meet the requirement that the moving iron core 2 attraction stroke is greater than the valve core 3 moving stroke, that is, H1>H2, therefore, the strict control of the stroke of the moving iron core 2 and the high requirements for the processing accuracy of each component increase the production difficulty and cost; the moving iron core 2 and the valve core 3 of the present application are connected by threads, and the stroke of the moving iron core 2 can be adjusted within a certain range to optimize the control of the electromagnetic attraction force while ensuring the sealing performance, effectively reducing the processing difficulty and cost, and improving production efficiency; due to the simplification of the overall air path structure, the parts that need to be sealed in the solenoid valve are significantly reduced, further reducing the risk of leakage.

[0040] Compared with traditional solenoid valves, this application eliminates the pilot valve structure and adopts a cut-off structure in which the moving iron core 2 directly pulls the valve core 3. The coil 5 is energized and directly acts on the moving iron core 2, so that the moving iron core 2 and the valve core 3 move in an integrated manner to realize the opening and closing of the solenoid valve. There is no need to design a pilot air path, which simplifies the processing steps and reduces the production complexity.

[0041] As a preferred embodiment of the above, an adjusting member 33 is provided on the side of the valve core 3 close to the moving iron core 2. Specifically, by adjusting the stroke of the moving iron core 2 through the adjusting member 33, the requirement that the attraction stroke of the moving iron core 2 is greater than the movement stroke of the valve core 3 (H1>H2) can be more accurately met, ensuring that the sealing surface of the valve core 3 can be in close contact with the sealing nozzle 731, thereby significantly improving the sealing performance of the solenoid valve and reducing the risk of leakage.

[0042] As a preferred embodiment of the above, the adjusting member 33 is one of a hexagonal nut, a butterfly nut, and a knurled nut, among which the hexagonal nut is suitable for precise adjustment; the butterfly nut can realize quick manual adjustment; the knurled nut enhances the convenience of manual operation, makes the adjustment process more convenient, and saves maintenance time.

[0043] Among them, reference Figure 1 、 Figure 2 The surface of the raised structure 31 is provided with a soft rubber layer. On the one hand, it can enhance the contact effect between the sealing surface of the valve core 3 and the sealing nozzle 731 of the valve sleeve assembly 7. The soft rubber material has good elasticity and adaptability, and can effectively fill small gaps, provide more reliable sealing, and reduce the risk of leakage; on the other hand, during the power on and off cycle, the soft rubber layer can absorb part of the impact force, reduce the impact noise when the moving iron core 2 drives the valve core 3 to move, and optimize the operating environment of the product.

[0044] In this embodiment, reference Figure 2 、 Figure 5The valve sleeve assembly 7 includes an upper valve sleeve 71, a middle valve sleeve 72 and a lower valve sleeve 73 arranged in sequence, and the end face of the upper valve sleeve 71 is arranged at the end of the magnetic isolation tube 4, so that the first blind hole 42 forms a closed accommodating space; the middle valve sleeve 72 and the lower valve sleeve 73 are radially provided with a plurality of through holes 732 for communicating with the first cavity 81. When the coil 5 is not energized, the gas enters the accommodating space from the air inlet 821 to form a balance, and the bottom surface of the protruding structure 31 contacts the sealing mouth 731 of the lower valve sleeve 73 tightly. The valve core 3 is moved upwards, and the bottom surface of the protruding structure 31 is away from the sealing mouth 731. The gas passes through the lower valve sleeve 73, the through hole 732, and the first cavity 81 in sequence, and is then led out from the gas outlet 811. The middle valve sleeve 72 and the lower valve sleeve 73 are radially provided with a plurality of through holes 732, which are connected to the first cavity 81, which can optimize the distribution and flow path of the airflow, reduce the airflow resistance, and improve the switching efficiency and response speed of the solenoid valve.

[0045] As a preferred embodiment of the above, the middle valve sleeve 72 and the lower valve sleeve 73 are provided with sealing nozzles 731 on both sides of the upper and lower end surfaces of the raised structure 31. The sealing nozzle 731 is an annular conical protrusion. On the one hand, the annular conical protrusion can fit tightly with the raised structure 31 of the valve core 3 to form a sealing effect, further reduce the risk of leakage, and enhance the reliability of the seal; on the other hand, the sealing nozzle 731 of the annular conical protrusion is designed with a smaller contact surface, which can concentrate the sealing pressure and reduce the wear of the sealing surface caused by friction or deformation during long-term use, thereby extending the service life of the sealing component.

[0046] In this embodiment, the side wall of the valve body 8 is provided with an exhaust port 812 connected to the first cavity 81, and the end of the exhaust port 812 is provided with a platform muffler 813. The platform muffler 813 can discharge the airflow smoothly, avoid the impact force and vibration caused by high-speed discharge of gas, thereby improving the stability and safety of equipment operation; the platform muffler 813 optimizes the airflow discharge path and speed, reduces the influence of the back pressure in the valve on the switching speed, and improves the response efficiency and operation stability of the solenoid valve.

[0047] Among them, the air inlet 821 and the air outlet 811 are tilted with the inside higher and the outside lower. Specifically, the tilted design of the air inlet and outlet 811 can alleviate turbulence and impact in the flow of the medium, reduce vibration and noise caused by fluid dynamics, and optimize the operating environment of the equipment.

[0048] As a preferred embodiment of the above, Figure 1 、 Figure 5As shown, it also includes a bottom cover 83 and a manual rod 84. The bottom cover 83 is arranged at the end of the second cavity 82, and a countersunk hole is provided inside the bottom cover 83. The manual rod 84 is provided with a first diameter section 841, a second diameter section 842 and a third diameter section 843 in sequence, and the third diameter section 843 is larger than the second diameter section 842 and the first diameter section 841. The manual rod 84 passes through the countersunk hole so that the third diameter section 843 is arranged in the countersunk hole, and the second diameter section 842 is radially provided with a pin 844 to prevent the manual rod 84 from falling off. On the one hand, by arranging the manual rod 84 at the bottom cover 83, the valve core 3 can be manually operated to open or close when the solenoid valve loses electromagnetic drive, providing an emergency operation function, which is suitable for special situations such as power outages or control system failures, and enhances the reliability and practicality of the equipment; on the other hand, the third diameter section 843 of the manual rod 84 is arranged in the countersunk hole, which increases the control torque of manual operation, reduces the impact of misoperation or unnecessary actions on the equipment, and improves operation accuracy and safety of use.

[0049] In this embodiment, a second spring 9 is sleeved on the first diameter section 841, and the end of the second spring 9 acts on the valve core 3 to provide an upward elastic force for the valve core 3. Specifically, the second spring 9 provides auxiliary elastic force, so that the force of the manual rod 84 on the valve core 3 during operation is more stable and gentle. The gentle force reduces the wear frequency of the valve core 3 and the manual rod 84. At the same time, the second spring 9 provides a reset elastic force for the manual rod 84, and quickly restores the manual rod 84 to its initial position after the operation is completed, ensuring that the valve core 3 and the manual rod 84 maintain a good reset state in the non-operating state, thereby improving the safety and reliability of the equipment.

[0050] Those skilled in the art should understand that the present invention is not limited to the above-described embodiments. The above-described embodiments and the specification are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A straight-pull iron core stop type solenoid valve, characterized in that: include: A static iron core, a movable iron core, a valve core, a magnetic isolation tube, a coil, a first spring, a valve sleeve assembly and a valve body; The magnetic isolation tube is a cylindrical structure with two ends open, including a first through hole and a first blind hole. One end of the magnetic isolation tube is arranged in the coil, and the other end is arranged in the valve body. The static iron core and the movable iron core are arranged in the first through hole from top to bottom. The first spring is arranged between the static iron core and the movable iron core for applying a downward force to the movable iron core. The valve body includes a first cavity and a second cavity that are interconnected, an air outlet that is connected to the first cavity is provided on the side wall of the valve body, and an air inlet that is connected to the second cavity is provided on the side wall of the valve body; The valve sleeve assembly is arranged in the first cavity, one end of the valve core is connected to the moving iron core, and the other end is arranged in the valve sleeve assembly; a protrusion structure is radially provided on the end of the valve core, which contacts the sealing mouth of the valve sleeve assembly to form a seal; an air hole is provided inside the valve core to connect the first blind hole and the second cavity, and the moving iron core and the valve core are controlled to move up and down by turning on and off the power of the coil to realize the opening and closing of the air outlet.

2. A straight-pull iron core stop type solenoid valve according to claim 1, characterized in that: An adjusting member is provided on one side of the valve core close to the moving iron core.

3. A straight-pull iron core stop type solenoid valve according to claim 2, characterized in that: The adjusting piece is one of a hexagonal nut, a butterfly nut, and a knurled nut.

4. The straight-pull iron core stop type solenoid valve according to claim 1, characterized in that: A soft rubber layer is provided on the surface of the protruding structure.

5. The straight-pull iron core stop type solenoid valve according to claim 1, characterized in that: The valve sleeve assembly includes an upper valve sleeve, a middle valve sleeve and a lower valve sleeve arranged in sequence, and the end face of the upper valve sleeve is arranged at the end of the magnetic isolation tube, so that the first blind hole forms an accommodating space; the middle valve sleeve and the lower valve sleeve are radially provided with multiple through holes for communicating with the first cavity.

6. The straight-pull iron core stop type solenoid valve according to claim 5, characterized in that: The middle valve sleeve and the lower valve sleeve are both provided with sealing nozzles on both sides close to the upper and lower end surfaces of the protruding structure, and the sealing nozzles are annular conical protrusions.

7. The straight-pull iron core stop type solenoid valve according to claim 1, characterized in that: The side wall of the valve body is provided with an exhaust port communicating with the first cavity, and the end of the exhaust port is provided with a platform muffler.

8. The straight-pull iron core stop type solenoid valve according to claim 1, characterized in that: The air inlet and the air outlet are arranged to be inclined with the inner portion higher and the outer portion lower.

9. The straight-pull iron core stop type solenoid valve according to claim 1, characterized in that: It also includes a bottom cover manual rod, which is arranged at the end of the second cavity. A countersunk hole is provided inside the bottom cover. The manual rod is provided with a first diameter section, a second diameter section and a third diameter section in sequence, and the third diameter section is larger than the second diameter section and larger than the first diameter section. The manual rod passes through the countersunk hole so that the third diameter section is arranged in the countersunk hole. A pin is radially provided in the second diameter section to prevent the manual rod from falling off.

10. The straight-pull iron core stop type solenoid valve according to claim 9, characterized in that: A second spring is sleeved on the first diameter section, and an end portion of the second spring acts on the valve core to provide an upward elastic force for the valve core.

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