Novel electromagnetic three-way air valve

Abstract

The utility model relates to the technical field of accessories special for gas chromatographs, in particular to a novel electromagnetic three-way gas valve which comprises a valve body, an iron shell is arranged at the top end of the valve body, a valve seat is placed at the bottom end of the surface of the iron shell, a coil framework is arranged at the top end in the iron shell, and a coil is installed on the surface of the coil framework. Stop iron is fixed in the coil framework, moving iron capable of moving up and down is arranged in the coil framework and located below the stop iron, a two-way spring is placed in the moving iron, and a lower valve diaphragm is arranged at the bottom end in the moving iron. According to the utility model, the valve nozzle for processing the small hole is used on the valve nozzle, so that the processing cost is reduced, the buffer structure is arranged on the valve nozzle, the impact force on the sealing element is reduced, and the service life can reach more than 5 million times; the high-temperature quick-response structural design reduces the gas resistance of the action of the valve core, and the stainless steel pipe is additionally arranged on the coil framework to prevent high-temperature deformation.

Description

Technical Field

[0001] The utility model relates to the technical field of special accessories for gas chromatographs, in particular to a novel electromagnetic three-way valve. Background Technique

[0002] A gas chromatograph refers to a chromatographic analysis instrument that uses gas as the mobile phase. Its principle is mainly to separate mixtures by utilizing the differences in the boiling points, polarities, and adsorption properties of substances. An electromagnetic three-way valve is required when using a gas chromatograph.

[0003] However, the existing electromagnetic three-way valves have the following disadvantages: the through-hole diameter is too large, and when the user requires a through-hole diameter below 0.8 mm, it cannot be used; the catalyst part of the solenoid valve has adsorption properties and is not corrosion-resistant. To accelerate the response, there may be lubricating oil in the valve chamber; the service life of the sealing material is low; the response is slow at high temperatures (105 °C); the valve body is not firm, and when the external dimensions are small, the reliability of the product is insufficient. Content of the Utility Model

[0004] The purpose of the utility model is to provide a novel electromagnetic three-way valve to solve the problems of the existing electromagnetic three-way valve, such as too large through-hole diameter, not corrosion-resistant, low life, slow response, and insufficient reliability, as mentioned in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A novel electromagnetic three-way valve includes a valve body. A iron shell is arranged at the top end of the valve body, and a valve seat is placed at the bottom end of the surface of the iron shell. A coil skeleton is arranged at the top end inside the iron shell, and a coil is installed on the surface of the coil skeleton; A stop iron is fixed inside the coil skeleton, and the top end of the stop iron extends to the outside of the iron shell; Inside the coil skeleton and below the stop iron, a movable iron that moves up and down is arranged, and the bottom end of the movable iron extends into the valve seat. And a gas groove is arranged on one side of the surface of the movable iron; A two-way spring is placed inside the movable iron. A lower valve diaphragm is arranged at the bottom end inside the movable iron, and the surface of the lower valve diaphragm is tightly attached to the bottom end of the two-way spring, and the bottom end of the two-way spring penetrates through the iron cover.

[0006] Preferably, inner hexagon socket head cap screws are arranged at the four corner positions on the surface of the valve body, and the bottom ends of the inner hexagon socket head cap screws penetrate through the valve body and are fixedly connected to the surface of the iron shell by threading.

[0007] Preferably, one side of the top end of the coil is electrically connected to an aviation wire, and the top end of the aviation wire passes through the coil skeleton and extends to the outside of the iron shell.

[0008] Preferably, a stainless steel pipe is sleeved on the surface of the bottom of the stop iron, and the top end of the movable iron extends into the stainless steel pipe. The movable iron is used for guiding work when the movable iron moves up and down.

[0009] Preferably, a spring guide rod is installed inside the moving iron and at the top of the two-way spring. An upper valve diaphragm that can move up and down is arranged above the spring guide rod inside the moving iron, and the upper valve diaphragm is in close contact with the spring guide rod.

[0010] Preferably, an upper valve nozzle is installed at the bottom end inside the stop iron and directly above the upper valve diaphragm. An upper sealing gasket is sleeved on the top end of the upper valve nozzle, and the upper sealing gasket is located inside the stop iron.

[0011] Preferably, an O-ring seal is installed at the bottom end of the valve seat, and the bottom end of the O-ring seal is in close contact with the surface of the valve body. The O-ring seal is used for the sealing work between the valve body and the valve seat.

[0012] Preferably, an iron cover is sleeved on the bottom end of the moving iron, an air valve spring is fixed on the surface of the iron cover, and the top end of the air valve spring is in close contact with the inner wall of the valve seat.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows: When the coil on the surface of the coil bobbin is energized under the connection of the aviation wire during the implementation of the new type of electromagnetic three-way air valve, the stop iron attracts the moving iron. After the moving iron is attracted, it will move upward, causing the upper valve diaphragm to close, and at the same time, the lower valve diaphragm will also close. Gas enters the valve chamber from the left COM end in the valve body and then flows out from the right NC end in the valve body; when the coil is de-energized, the air valve spring returns the moving iron downward. The lower valve diaphragm closes, and the upper valve diaphragm opens. Gas enters the valve chamber from the left COM end and then flows out from the NO end; A valve nozzle with a small processed hole is used on the valve nozzle of the present utility model. As long as it is processed on the valve nozzle, the processing cost is reduced; for the catalyst part of the solenoid valve, 316L is used for metals and FFKM perfluoro rubber is used for seals. In addition, the catalyst part of this product does not contain any substances of other materials; A buffer structure is provided on the valve nozzle, reducing the impact force on the seal, and the service life can reach more than 5 million times; With the design of a high-temperature fast-response structure, the gas resistance of the spool movement is reduced, and a stainless steel pipe is installed on the coil bobbin to prevent high-temperature deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a three-dimensional external structure schematic diagram of the present utility model;

[0015] Figure 2 is a Y-direction cross-sectional structure schematic diagram of the present utility model;

[0016] Figure 3 is an X-direction cross-sectional structure schematic diagram of the present utility model;

[0017] Figure 4 is an enlarged cross-sectional structure schematic diagram of the present utility model;

[0018] Figure 5This is the schematic diagram of the explosion structure of the present utility model.

[0019] In the figure: 1. Valve body; 2. Iron shell; 3. Moving iron; 31. Air groove; 4. Coil skeleton; 5. Aviation wire; 6. Iron cover; 7. Valve seat; 8. Stainless steel pipe; 9. Stop iron; 10. Hexagon socket head cap screw; 11. Lower valve nozzle; 12. Lower gasket; 13. Lower valve diaphragm; 14. O-ring; 15. Air valve spring; 16. Upper valve diaphragm; 17. Upper valve nozzle; 18. Upper gasket; 19. Two-way spring; 20. Spring guide rod; 21. Coil. Specific embodiments

[0020] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. In addition, the terms "first", "second", "third", "upper, lower, left, right", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. At the same time, in the description of the present utility model, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it 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 directly connected or indirectly connected through an intermediate medium. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0021] The structure of the novel electromagnetic three-way air valve provided by the present utility model is as Figure 1 shown, including a valve body 1. An iron shell 2 is provided at the top of the valve body 1. Hexagon socket head cap screws 10 are provided at the four corner positions on the surface of the valve body 1, and the bottom ends of the hexagon socket head cap screws 10 penetrate through the valve body 1 and are threadedly fixed to the surface of the iron shell 2. A coil skeleton 4 is provided at the top end inside the iron shell 2, and a coil 21 is installed on the surface of the coil skeleton 4. One side of the top end of the coil 21 is electrically connected to an aviation wire 5, and the top end of the aviation wire 5 passes through the coil skeleton 4 and extends to the outside of the iron shell 2.

[0022] During implementation, the coil 21 on the surface of the coil skeleton 4 is energized or de-energized under the connection of the aviation wire 5.

[0023] Furthermore, as Figure 2 shown, a lower valve nozzle 11 is installed inside the valve body 1, and the lower valve nozzle 11 is directly below the lower valve diaphragm 13; a lower gasket 12 is sleeved at the bottom end of the lower valve nozzle 11, and the lower gasket 12 is used for the sealing work when the lower valve nozzle 11 is installed with the valve body 1.

[0024] The design of the fine-hole valve nozzle of the present utility model specifically designs the lower valve nozzle 11 into a special fine-hole fitting. After being tightly fitted into the valve body 1, the tail is sealed with the lower gasket 12. At the same time, the valve nozzle is precisely machined with special equipment, and the appearance is simple. Compared with the structure of integrating the valve nozzle on the valve body in the prior art, the special valve nozzle is easier to machine. If there are defects during the machining of the fine hole, the loss is also small. If users have different requirements for the through diameter, they only need to change the valve nozzle.

[0025] Furthermore, as Figure 4 shown, a valve seat 7 is placed at the bottom end of the surface of the iron shell 2. An armature 9 is fixed inside the coil bobbin 4, and the top end of the armature 9 extends to the outside of the iron shell 2. A movable armature 3 that moves up and down is arranged below the armature 9 inside the coil bobbin 4, and the bottom end of the movable armature 3 extends into the valve seat 7. And an air groove 31 is arranged on one side of the surface of the movable armature 3. A stainless steel pipe 8 is sleeved on the surface of the bottom of the armature 9, and the top end of the movable armature 3 extends into the stainless steel pipe 8. The movable armature 3 is used for guiding work when the movable armature 3 moves up and down.

[0026] In the high-temperature and fast-response design of the present utility model, an air groove 31 is designed on the movable armature 3. When the movable armature 3 is attracted and reset by the armature 9, the air resistance can be effectively reduced; a stainless steel pipe 8 is designed outside the movable armature 3. When the solenoid valve is energized for a long time and the temperature rise inside the valve core is greater than 100 °C, it can prevent the coil bobbin 4 from deforming and inwardly tightening the moving gap of the movable armature, ensuring that the movable armature 3 can respond quickly at high temperatures.

[0027] Furthermore, as Figure 3 shown, a lower valve diaphragm 13 is arranged at the bottom end inside the movable armature 3. An O-ring 14 is installed at the bottom end of the valve seat 7, and the bottom end of the O-ring 14 is in close contact with the surface of the valve body 1. The O-ring 14 is used for sealing between the valve body 1 and the valve seat 7. A ferrule 6 is sleeved on the bottom end of the movable armature 3, and an air valve spring 15 is fixed on the surface of the ferrule 6, and the top end of the air valve spring 15 is in close contact with the inner wall of the valve seat 7

[0028] In the non-sticking design of the present utility model, since the gas chromatograph requires that the catalyst parts of the solenoid valve, and when the medium flows through the solenoid valve, there should be no sticking; for this reason, the valve body 1, the lower valve nozzle 11 and the upper valve nozzle 17 of the present utility model are all made of 316L material; the movable armature 3 and the armature 9 are made of 430F material and passivated on the surface after being made; at the same time, the lower valve diaphragm 13, the O-ring 14 and the upper valve diaphragm 16 are all made of FFKM perfluororubber, and there are no auxiliary materials such as glue and lubricant in the catalyst part, ensuring that the product meets the requirements of users.

[0029] Furthermore, as Figure 5As shown in the figure, a two-way spring 19 is placed inside the moving iron 3, and the surface of the lower valve diaphragm 13 is in close contact with the bottom end of the two-way spring 19. The bottom end of the two-way spring 19 penetrates through the iron cover 6. Inside the moving iron 3 and at the top of the two-way spring 19, a spring guide rod 20 is installed. Above the spring guide rod 20 inside the moving iron 3, an upper valve diaphragm 16 that can move up and down is provided, and the upper valve diaphragm 16 is in fit with the spring guide rod 20. At the bottom end inside the stop iron 9 and directly above the upper valve diaphragm 16, an upper valve nozzle 17 is installed, and an upper sealing gasket 18 is sleeved on the top end of the upper valve nozzle 17. The upper sealing gasket 18 is located inside the stop iron 9.

[0030] In the buffer and sealing design of the present utility model, when the stop iron 9 is attracted, the lower valve diaphragm 13 on the moving iron 3 will be instantaneously impacted by the lower valve nozzle 11. To ensure the service life of the lower valve diaphragm 13, a two-way spring 19 and a spring guide rod 20 are designed below the diaphragm to reduce the impact.

[0031] Working principle: When the coil 21 on the surface of the coil bobbin 4 is energized under the connection of the aviation wire 5, the stop iron 9 attracts the moving iron 3. After the moving iron 3 is attracted, it will move upward, causing the upper valve diaphragm 16 to close. At the same time, the lower valve diaphragm 13 will also close. The gas enters the valve chamber from the left COM end in the valve body 1 and then flows out from the right NC end in the valve body 1. When the coil 21 is de-energized, the air valve spring 15 resets the moving iron 3 downward. The lower valve diaphragm 13 closes, and the upper valve diaphragm 16 opens. The gas enters the valve chamber from the left COM end and then flows out from the NO end.

[0032] In the residual magnet overcoming design of the present utility model, to be applicable to the application scenarios of short time and large displacement, the power is relatively large, 17.5W. For the electromagnetic structure of such a small volume of this product, residual magnetism that affects the product performance will be generated after power-on. Therefore, in the present utility model, a buffer structure is provided at the closed position of the valve core; the buffer structure is that an upper valve diaphragm 16 is provided in the moving iron 3. When the stop iron 9 attracts the moving iron 3, the upper valve diaphragm 16 collides with the spring guide rod 20, which can effectively reduce the effect of residual magnetism, accelerate the reset speed of the valve core after power-off, and at the same time can also make the spring guide rod 20 not easily loosen and reduce the mechanical vibration when the solenoid valve is attracted.

[0033] For those skilled in the art, it is obvious that the present utility model is not limited to the details of the above exemplary embodiments, and can be implemented in other specific forms without departing from the spirit or basic characteristics of the present utility model. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present utility model is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be encompassed by the present utility model. Any reference signs in the claims should not be regarded as limiting the claimed rights.

Claims

1. A novel electromagnetic three-way air valve, comprising a valve body (1), characterized in that: An iron shell (2) is arranged at the top of the valve body (1), and a valve seat (7) is placed at the bottom of the surface of the iron shell (2); a coil frame (4) is arranged at the top of the inside of the iron shell (2), and a coil (21) is installed on the surface of the coil frame (4); a stopper iron (9) is fixed inside the coil frame (4), and the top of the stopper iron (9) extends to the outside of the iron shell (2); a movable iron (3) movable up and down is arranged inside the coil frame (4) and below the stopper iron (9), and the bottom of the movable iron (3) extends to the inside of the valve seat (7), and an air groove (31) is arranged on one side of the surface of the movable iron (3); a two-way spring (19) is placed inside the movable iron (3), and a lower valve diaphragm (13) is arranged at the bottom of the inside of the movable iron (3), and the surface of the lower valve diaphragm (13) and the bottom of the two-way spring (19) are in close contact with each other, and the bottom of the two-way spring (19) passes through the iron cover (6).

2. The novel electromagnetic three-way valve according to claim 1 is characterized in that: Hexagon socket cylindrical screws (10) are provided at the four corner positions on the surface of the valve body (1), and the bottom ends of the hexagon socket cylindrical screws (10) penetrate the valve body (1) and are fixedly connected to the surface threads of the iron shell (2).

3. The new electromagnetic three-way valve according to claim 1 is characterized in that: One side of the top end of the coil (21) is electrically connected to an aviation wire (5), and the top end of the aviation wire (5) passes through the coil frame (4) and extends to the outside of the iron shell (2).

4. The novel electromagnetic three-way valve according to claim 1 is characterized in that: A stainless steel tube (8) is sleeved on the surface of the bottom of the stop iron (9), and the top end of the moving iron (3) extends into the interior of the stainless steel tube (8). The moving iron (3) is used for guiding work when the moving iron (3) moves up and down.

5. The novel electromagnetic three-way valve according to claim 1 is characterized in that: A spring guide rod (20) is installed inside the moving iron (3) and at the top of the two-way spring (19); an upper valve diaphragm (16) that can move up and down is arranged inside the moving iron (3) and above the spring guide rod (20); and the upper valve diaphragm (16) and the spring guide rod (20) are in contact with each other.

6. The novel electromagnetic three-way valve according to claim 1 is characterized in that: An upper valve nozzle (17) is installed at the bottom end of the interior of the stop iron (9) and directly above the upper valve diaphragm (16), and an upper sealing gasket (18) is sleeved on the top end of the upper valve nozzle (17). The upper sealing gasket (18) is located inside the stop iron (9).

7. The novel electromagnetic three-way valve according to claim 1 is characterized in that: An O-ring (14) is installed at the bottom end of the valve seat (7), and the bottom end of the O-ring (14) is in close contact with the surface of the valve body (1). The O-ring (14) is used for sealing between the valve body (1) and the valve seat (7).

8. The novel electromagnetic three-way valve according to claim 1 is characterized in that: The bottom end of the moving iron (3) is sleeved with an iron cover (6), and a gas valve spring (15) is fixed to the surface of the iron cover (6), and the top end of the gas valve spring (15) is in close contact with the inner wall of the valve seat (7).

Images