Diaphragm solenoid valve

Abstract

The utility model belongs to the technical field of electromagnetic valve, especially relate to a diaphragm electromagnetic valve. It includes: valve seat, coil assembly, coil assembly installs one end at valve seat, diaphragm piece, diaphragm piece sets up between valve seat and coil assembly, heating part, heating part is used for heating valve seat or coil assembly. Compared with prior art, the diaphragm electromagnetic valve in the utility model sets up heating part outside the electromagnetic valve, directly aims at the characteristics that iodine vapour is easy to condense, avoids solid iodine deposition in flow channel through active heating, solves the problem of blockage from the root.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, and in particular relates to a diaphragm electromagnetic valve. Background Technology

[0002] Iodine, as an important functional medium, has irreplaceable application value in aerospace, semiconductor manufacturing, nuclear industry, and high-end testing equipment. For example, in aerospace propulsion systems, iodine vapor, due to its high energy density and easy storage, has become the core working fluid of ion thrusters; in ionization detectors and radioactive detection instruments, iodine vapor, as an ionization source or labeling medium, directly affects the detection accuracy and stability of the equipment; at the same time, in processes such as semiconductor material doping and specialty chemical synthesis, precise control of iodine vapor is also a key link in ensuring product quality.

[0003] However, the physicochemical properties of iodine vapor pose extremely stringent challenges to control valves. Iodine has a sublimation point of 113.5℃, and during the process, it needs to be heated to maintain its gaseous state. However, once the temperature drops below the sublimation point, gaseous iodine easily condenses into a solid and deposits, leading to flow channel blockage, flow fluctuations, and even valve jamming, severely affecting the continuous operation of the system. A more prominent problem is that iodine vapor (I2) is extremely chemically corrosive, especially in high-temperature and humid environments. It easily reacts with metallic materials to form volatile and easily flaking iodides (such as FeI2, NiI2, etc.), causing corrosion failure of valve body sealing surfaces and a significant increase in leakage risk. Simultaneously, iodine vapor combined with water vapor can also generate highly corrosive electrolytes such as hydroiodic acid (HI), causing severe corrosion of metal components such as coils and iron cores in electromagnetic drive components, leading to electromagnetic force attenuation and control failure.

[0004] In addition, most traditional diaphragm solenoid valves use PTFE diaphragms, which are prone to swelling and aging when exposed to iodine vapor for a long time, resulting in insufficient lifespan.

[0005] Based on this, the present invention provides a novel diaphragm solenoid valve to overcome the above-mentioned defects. Utility Model Content

[0006] The purpose of this invention is to provide a diaphragm solenoid valve. This diaphragm solenoid valve uses a heating element installed on the outside of the solenoid valve to directly address the characteristic of iodine vapor being easily condensed. By actively heating, it avoids the deposition of solid iodine in the flow channel, thus solving the blockage problem at its root.

[0007] This utility model adopts the following technical solution: a diaphragm solenoid valve, comprising:

[0008] Valve seat;

[0009] A coil assembly, the coil assembly being mounted at one end of the valve seat;

[0010] A diaphragm is disposed between the valve seat and the coil assembly;

[0011] A heating element for heating the valve seat or the coil assembly.

[0012] Furthermore, the heating element is a heating sleeve or a heating belt.

[0013] Furthermore, the heating band is fitted over the coil assembly.

[0014] Furthermore, the heating jacket or the heating band is set to a constant temperature.

[0015] Furthermore, a fluid channel is formed inside the valve seat, the fluid channel including a first flow channel, a second flow channel, a third flow channel and a fourth flow channel connected in sequence;

[0016] The third flow channel is inclined near the second flow channel.

[0017] Furthermore, the valve seat is made of a corrosion-resistant metal material selected from tantalum, stainless steel alloy, or nickel-based alloy.

[0018] Furthermore, the valve seat is made of tantalum, and its tantalum content is greater than or equal to 99.9%.

[0019] Furthermore, the diaphragm is a thin metal film.

[0020] Furthermore, the coil assembly includes a valve core assembly and an electromagnetic drive assembly;

[0021] The electromagnetic drive assembly includes a coil frame, an electromagnetic coil wound on the coil frame, and a coil housing covering the electromagnetic coil.

[0022] The outer shell of the coil and the conductor of the electromagnetic coil are both covered with a high-temperature and corrosion-resistant layer.

[0023] Furthermore, the electromagnetic coil is filled with a solidified insulating and thermally conductive material.

[0024] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0025] This invention relates to a diaphragm solenoid valve. By incorporating a heating element external to the solenoid valve, it directly addresses the condensation properties of iodine vapor, actively heating it to prevent solid iodine deposition within the flow channel and thus resolving the blockage problem at its source. If the heating element heats the valve seat, it directly maintains the flow channel temperature above the sublimation point of iodine, preventing iodine vapor from condensing into a solid and blocking the channel. If the heating element heats the coil assembly, heat can be conducted to the valve seat indirectly, while simultaneously preventing water vapor formation in the coil area due to low temperatures, reducing the risk of iodine vapor combining with water to form a highly corrosive electrolyte. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the diaphragm solenoid valve structure in a specific embodiment of this utility model;

[0028] The components include: valve seat 1, first flow channel 10, second flow channel 11, third flow channel 12, fourth flow channel 13; coil assembly 2, valve core assembly 20, moving iron core 201, return spring 202, electromagnetic coil 21, coil housing 22; diaphragm 3; and heating element 4. Detailed Implementation

[0029] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0030] The following is in conjunction with the appendix Figure 1 The present invention will be described in detail with reference to specific embodiments:

[0031] like Figure 1 As shown, this utility model provides a diaphragm solenoid valve, which is mainly suitable for iodine vapor environments, and includes:

[0032] Valve seat 1;

[0033] Coil assembly 2, wherein the coil assembly 2 is mounted at one end of the valve seat 1;

[0034] Diaphragm 3 is disposed between valve seat 1 and coil assembly 2 to completely physically isolate iodine vapor medium from coil assembly 2, thereby preventing corrosion of coil assembly 2.

[0035] Heating element 4 is used to heat the valve seat 1 or the coil assembly 2. The heating element 4 heats the valve seat 1 or the coil assembly 2 by contact conduction or thermal radiation.

[0036] This invention relates to a diaphragm solenoid valve. By installing a heating element 4 on the outside of the solenoid valve, it directly addresses the condensation properties of iodine vapor, actively heating it to prevent solid iodine deposition in the flow channel and thus solving the blockage problem at its source. If the heating element 4 heats the valve seat 1, it can directly maintain the flow channel temperature above the sublimation point of iodine, preventing iodine vapor from condensing into a solid and blocking the channel. If the heating element 4 heats the coil assembly 2, heat can be conducted to the valve seat 1 through the structure to achieve indirect heating, while avoiding the generation of water vapor in the coil area due to low temperature, reducing the risk of iodine vapor combining with water to form a highly corrosive electrolyte.

[0037] Furthermore, in some specific embodiments, the heating element 4 is a heating sleeve or a heating belt.

[0038] When the object to be heated is valve seat 1, a heating sleeve can achieve full contact with the outer surface of valve seat 1. This large-area contact conduction rapidly increases the temperature of the fluid channel, ensuring overall temperature uniformity within the fluid channel. This is particularly suitable for scenarios where valve seat 1 has a regular columnar or irregular shape, avoiding the risk of condensation due to insufficient localized heating. Specifically, the heating sleeve can match the shape of valve seat 1 to form a wrapping structure.

[0039] When the object to be heated is coil assembly 2, the heating tape can be flexibly wound around the surface of the coil housing to accommodate the complex shape of the coil assembly, such as terminals or protrusions. Heating of key areas can be achieved by adjusting the local winding density, while simultaneously reducing the space occupied by the coil assembly 2. Specifically, the heating tape can adopt a flexible, long strip structure to increase the flexibility of winding.

[0040] More preferably, the heating band is sleeved outside the coil assembly 2.

[0041] When the heating belt directly heats the coil assembly 2, it indirectly raises the temperature of the valve seat 1 and the fluid channel through heat conduction to meet the anti-condensation requirements. On the other hand, it can make the temperature of the coil assembly 2 itself higher than the ambient dew point, avoiding the formation of condensate on the surface of the coil shell due to low temperature. This fundamentally blocks the reaction conditions of "iodine vapor + water vapor → highly corrosive electrolyte". Compared with heating the valve seat 1 alone, it can better protect the electromagnetic drive components inside the coil assembly 2 from corrosion and significantly extend the life of the electromagnetic drive system.

[0042] Meanwhile, the iodine vapor control requires extremely high precision in the sealing fit between valve seat 1 and diaphragm 3. If valve seat 1 is directly heated, the high temperature may cause slight thermal deformation of the sealing surface (especially for metal materials), affecting the reliability of the seal. However, the indirect heating method of the heating coil assembly 2 keeps valve seat 1 in a relatively "gentle heating" state, which can reduce the deformation caused by thermal stress and ensure the fitting precision of the sealing surface during long-term use.

[0043] More specifically, in this embodiment, the heating jacket or heating band is set to a constant temperature. This is because the physical properties of iodine vapor are extremely sensitive to temperature: when the temperature is below the sublimation point, gaseous iodine will condense into a solid deposit, directly blocking the valve seat flow channel and causing valve failure; when the temperature is too high (far exceeding the sublimation point), although it will not condense, it will aggravate the volatility and diffusion of iodine vapor, increase the pressure load on the sealing system, and may even accelerate the aging of the solenoid valve.

[0044] The constant temperature heating setting can precisely lock the heating temperature within a fixed range slightly above the iodine sublimation point (e.g., 120-150℃, adjusted according to working conditions). This avoids "solid iodine deposition and blockage" caused by temperature fluctuations below the sublimation point, ensuring that the fluid channel is always unobstructed and meeting the stable control requirements of iodine vapor flow. It also avoids the problem of "over-sublimation" caused by excessively high temperatures, balancing the stability of iodine vapor and reducing additional wear and tear on seals and solenoid valves.

[0045] Furthermore, in some specific embodiments, a fluid channel is formed inside the valve seat 1. The fluid channel is a smooth flow path to avoid stagnation areas and dead corners, thereby reducing the risk of deposition.

[0046] Specifically, the fluid channel includes a first flow channel 10, a second flow channel 11, a third flow channel 12, and a fourth flow channel 13 connected in sequence. The third flow channel 12 is inclined near the second flow channel 11. The inclined design forms a smooth transition flow guide structure between the second flow channel 11 and the third flow channel 12. The flow rate attenuation rate of the fluid (iodine vapor) decreases when it changes direction, reducing the adhesion of iodine molecules due to excessively slow flow rate. At the same time, the inner wall of the flow channel has no abrupt corners, allowing iodine vapor to flow smoothly along the inclined wall surface, thus avoiding the chain reaction of "stagnation-condensation-deposition" from a geometrical perspective.

[0047] Furthermore, in some specific embodiments, the valve seat 1 is made of a corrosion-resistant metal material selected from tantalum, stainless steel alloy, or nickel-based alloy, which is resistant to iodine vapor corrosion and extends the service life of the solenoid valve. Preferably, the valve seat 1 is made of tantalum, and its tantalum content is greater than or equal to 99.9%. The stainless steel alloy is 316L. The nickel-based alloy is Hastelloy C276.

[0048] The diaphragm 3 is a thin metal film, preferably a tantalum film, which achieves complete isolation between the medium and the electromagnetic drive component. Simultaneously, the tantalum film is resistant to iodine vapor corrosion, extending the diaphragm's service life. Furthermore, tantalum metal has excellent ductility and elastic recovery, allowing the diaphragm to achieve precise deformation during the solenoid valve's switching process. This ensures both a tight seal with the fluid passage of the valve seat 1 and a rapid response to the electromagnetic drive component's commands, guaranteeing the solenoid valve's switching sensitivity and flow control accuracy.

[0049] Furthermore, in some specific embodiments, the coil assembly 2 includes a valve core assembly 20 and an electromagnetic drive assembly disposed outside the valve core assembly 20;

[0050] The electromagnetic drive assembly includes a coil frame, an electromagnetic coil 21 wound on the coil frame, and a coil shell 22 covering the electromagnetic coil 21. The coil shell 22 and the conductor of the electromagnetic coil 21 are covered with a high-temperature and corrosion-resistant layer to reduce the risk of corrosion. The electromagnetic coil 21 is filled with a solidified insulating and thermally conductive material to fill the gaps in the coil windings. This eliminates the risk of partial discharge caused by air gaps and prevents moisture and corrosive media from penetrating into the windings, ensuring that the coil maintains a high insulation resistance for a long time. In addition, the filling with thermally conductive material prevents the insulation from aging accelerated by high temperatures.

[0051] It should be noted that the high-temperature and corrosion-resistant layer in this invention can be made of materials such as polytetrafluoroethylene or ceramic coatings, and no specific limitation is made in this invention. The insulating and thermally conductive materials can be selected and designed by those skilled in the art according to the actual situation, as long as they can achieve the effects of insulation and thermal conductivity.

[0052] Additionally, it should be noted that the specific structure of the valve core assembly 20 in this invention is not limited, such as the moving iron core 201 and the return spring 202. One end of the moving iron core 201 is connected to the diaphragm 3, and the other end is connected to the return spring 202. During operation, after energization, the electromagnetic coil 21 generates a magnetic field that attracts the moving iron core 201 to the right, compressing the return spring 202 and driving the diaphragm 3 to move to the right, thus connecting the second flow channel 11 and the third flow channel 12. At this time, iodine vapor can flow from the inlet to the outlet of the fluid channel. After de-energization, the return spring 202 releases its stored elastic potential energy, pushing the diaphragm 3 back to its initial state, thus closing the second flow channel 11 and the third flow channel 12, thereby completing the opening and closing control of the diaphragm solenoid valve.

[0053] The diaphragm solenoid valve of this invention can be used in aerospace, semiconductor, vacuum systems or special gas control fields, and is especially suitable for precision applications where iodine vapor, which is highly corrosive, volatile and reactive, needs to be controlled.

[0054] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A diaphragm solenoid valve, characterized in that: It includes: A valve seat, wherein a fluid channel is formed inside the valve seat, the fluid channel including a first flow channel, a second flow channel, a third flow channel and a fourth flow channel connected in sequence, the third flow channel being inclined near the second flow channel; A coil assembly, the coil assembly being mounted at one end of the valve seat; A diaphragm is disposed between the valve seat and the coil assembly; A heating element is used to heat the valve seat or the coil assembly. The heating element is a heating sleeve or a heating band, and the heating sleeve or the heating band is set to a constant temperature.

2. The diaphragm solenoid valve according to claim 1, characterized in that: The heating band is fitted over the coil assembly.

3. The diaphragm solenoid valve according to claim 1, characterized in that: The valve seat is made of a corrosion-resistant metal material, which is selected from tantalum, stainless steel alloy or nickel-based alloy.

4. The diaphragm solenoid valve according to claim 3, characterized in that: The valve seat is made of tantalum, and its tantalum content is greater than or equal to 99.9%.

5. The diaphragm solenoid valve according to claim 1, characterized in that: The diaphragm is a thin metal film.

6. The diaphragm solenoid valve according to claim 1, characterized in that: The coil assembly includes a valve core assembly and an electromagnetic drive assembly; The electromagnetic drive assembly includes a coil frame, an electromagnetic coil wound on the coil frame, and a coil housing covering the electromagnetic coil. The outer shell of the coil and the conductor of the electromagnetic coil are both covered with a high-temperature and corrosion-resistant layer.

7. The diaphragm solenoid valve according to claim 6, characterized in that: The electromagnetic coil is filled with a solidified insulating and thermally conductive material.

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