Diaphragm valve with high corrosion resistance

Abstract

The utility model relates to the technical field of diaphragm valves, and discloses a high-corrosion-resistance diaphragm valve which comprises a valve seat, a valve body installed on the side portion of the valve seat, a valve cover arranged on the side portion of the valve body, a valve rod connected to the side portion of the valve cover, a cavity formed in the valve seat, a diaphragm body arranged on the side portion of the valve rod and used in cooperation with the cavity. The diaphragm is arranged to be the dish-shaped diaphragm, and compared with a traditional flat diaphragm, the dish-shaped diaphragm has the advantages that deformation is more uniform under pressure change, stress distribution is reasonable, and the local fatigue risk is reduced. The edge of the diaphragm is thickened and provided with the sealing lip which is tightly matched with the valve seat, the annular groove is formed in the lip and filled with the high-temperature-resistant and radiation-resistant sealant, the sealing effect is enhanced, and the problem that long-term stable sealing of a metal diaphragm or an elastomer diaphragm is difficult to guarantee in the extreme environment of spaceflight is solved. In the prior art, a metal diaphragm is easy to have fatigue cracks, and an elastomer diaphragm has the problems of degassing, hardening or embrittlement and the like under high vacuum and extreme temperature, so that the risk of medium leakage is increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of diaphragm valve, concretely to a high corrosion resistance diaphragm valve. BACKGROUND

[0002] Complex requirements of aerospace systems: The aerospace field covers various complex systems such as rocket launch, satellite operation, space station construction, etc. These systems have very high requirements for fluid control, including precise flow control, reliable sealing, and stable operation in extreme environments. For example, in the rocket propulsion system, the flow and pressure control of the propellant directly affect the performance of the engine; in the life support system of the space station, the supply of oxygen, water and other substances needs to be precisely controlled. Special environmental factors: The aerospace environment has the characteristics of high vacuum, wide temperature range (-200℃-200℃ or so), micro meteoroid impact risk, strong space radiation, etc. These conditions put strict requirements on the valve material and performance, and the valve needs to work reliably for a long time in such harsh environments.

[0003] Currently, neither metal diaphragms nor elastomer diaphragms can guarantee long-term stable sealing in extreme aerospace environments. Metal diaphragms are prone to fatigue cracks, while elastomer diaphragms may experience outgassing, hardening or embrittlement under high vacuum and extreme temperatures, leading to increased risk of medium leakage, which is a serious hidden danger for space missions; Therefore, it does not meet the existing needs, and for this we propose a high corrosion resistance diaphragm valve. CONTENT OF THE UTILITY MODEL

[0004] The utility model provides a kind of high corrosion resistance diaphragm valve, with Dished more uniform deformation under pressure change, stress distribution is reasonable, reduce local fatigue risk. Edge thickening and being provided with sealing lip, with valve seat close, lip has annular groove, fill high-temperature-resistant, radiation-resistant sealant, the beneficial effect of strengthening sealing effect, solve the problem that the above background technology mentioned that neither metal diaphragm nor elastomer diaphragm can guarantee long-term stable sealing in extreme aerospace environments. Metal diaphragms are prone to fatigue cracks, while elastomer diaphragms may experience outgassing, hardening or embrittlement under high vacuum and extreme temperatures, leading to increased risk of medium leakage, which is a serious hidden danger for space missions.

[0005] The utility model provides following technical scheme: a kind of high corrosion resistance diaphragm valve, including valve seat, the valve seat side portion is equipped with valve body, the valve body side portion is provided with valve cover, the valve cover side portion is connected with valve stem, the valve seat interior is equipped with cavity, the valve stem side portion is provided with diaphragm main part, the diaphragm main part is cooperated with the cavity.

[0006] As an optional scheme of the high corrosion resistance diaphragm valve, the valve seat side is respectively provided with an inlet groove and an outlet groove, the inlet groove, the outlet groove and the cavity are communicated.

[0007] As an optional scheme of the high corrosion resistance diaphragm valve, the valve seat is made of an aviation aluminum alloy.

[0008] As an optional scheme of the high corrosion resistance diaphragm valve, the diaphragm is a butterfly diaphragm, a sealing lip is connected to the outside of the diaphragm body, and the sealing lip is tightly fitted with the cavity.

[0009] As an optional scheme of the high corrosion resistance diaphragm valve, an annular groove is arranged in the sealing lip, the annular groove is filled with sealing glue, and the sealing glue is high-temperature-resistant and corrosion-resistant.

[0010] As an optional scheme of the high corrosion resistance diaphragm valve, the diaphragm body comprises a first membrane and a second membrane, the first membrane and the second membrane are connected to the end of the valve rod, and the first membrane and the second membrane are made of a high-temperature-resistant and radiation-resistant polyimide fiber fabric.

[0011] As an optional scheme of the high corrosion resistance diaphragm valve, a metal foil is connected between the first membrane and the second membrane.

[0012] As an optional scheme of the high corrosion resistance diaphragm valve, a fluorine rubber coating is arranged on the outside of the first membrane and the second membrane.

[0013] The utility model has the following beneficial effects:

[0014] 1. The high corrosion resistance diaphragm valve, by setting the diaphragm as a disc-shaped diaphragm, compared with the traditional flat membrane, the disc-shaped deformation is more uniform under pressure change, the stress distribution is reasonable, and the local fatigue risk is reduced. The edge is thickened and provided with a sealing lip, which is tightly fitted with the valve seat, the lip has an annular groove, filled with high-temperature-resistant and radiation-resistant sealing glue, which strengthens the sealing effect, solves the problem that neither metal diaphragm nor elastomer diaphragm can guarantee long-term stable sealing in extreme aerospace environment. Metal diaphragm is prone to fatigue cracks, and elastomer diaphragm will have problems such as outgassing, hardening or embrittlement under high vacuum and extreme temperature, which increases the risk of medium leakage, which is a serious hidden trouble for space missions.

[0015] 2、The high corrosion resistance diaphragm valve, by the diaphragm body is set to the polyimide fiber fabric that is resistant to high temperature and radiation, adopts multilayer composite structure, the base layer is the polyimide fiber fabric of high strength, resistant to high temperature and radiation, provides structural support, can resist the wide temperature range of-200 DEG C to 250 DEG C and space radiation. The surface is covered with corrosion-resistant, high-elasticity fluorine rubber coating, and can resist corrosive media such as rocket propellant, and ensure good sealing. The metal foil is inserted in the middle to enhance the compression and puncture resistance. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is the three-dimensional structure schematic diagram of the utility model.

[0017] Figure 2 It is the sectional structure schematic diagram of the utility model.

[0018] Figure 3 It is the diaphragm body structure schematic diagram of the utility model.

[0019] Figure 4 It is the metal foil structure schematic diagram of the utility model.

[0020] In the drawing: 110, valve seat;120, valve body;130, valve cover;140, valve stem;144, cavity;150, diaphragm body;151, first film;152, second film;153, metal foil;154, fluorine rubber coating;160, outlet groove;161, inlet groove;162, sealing lip;163, annular groove;164, sealing glue. DETAILED DESCRIPTION

[0021] The technical scheme in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the utility model.

[0022] Embodiment one, this embodiment aims to promote the solution that whether metal diaphragm or elastomer diaphragm, it is difficult to guarantee long-term stable sealing in aerospace extreme environment. Metal diaphragm is prone to fatigue crack, and elastomer diaphragm will appear degassing, hardening or embrittlement under high vacuum, extreme temperature, etc. Problem, leading to the risk of medium leakage increase, which is a very serious hidden trouble for space mission, please refer to Figures 1-4The utility model provides a high corrosion resistance diaphragm valve, including valve seat 110, the side of valve seat 110 installs valve body 120, the side of valve body 120 is provided with valve cover 130, valve cover 130 side is connected with valve stem 140, the inside of valve seat 110 is provided with cavity 144, and the side of valve stem 140 is provided with diaphragm main part 150, and diaphragm main part 150 is used with cavity 144.

[0023] Valve seat 110 side is provided with inlet groove 161 and outlet groove 160 respectively, and inlet groove 161, outlet groove 160 and cavity 144 are communicated.

[0024] The aviation aluminum alloy material of valve seat 110 is subjected to anodic oxidation treatment to improve surface hardness, wear resistance and corrosion resistance.

[0025] Some aerospace diaphragm valve materials can maintain good physical and mechanical properties in a wide temperature range of-200 DEG C to 250 DEG C, and can adapt to extreme temperature changes such as ultra-low temperature in space and high temperature when the aircraft re-enters the atmosphere, and ordinary valves are often difficult to work stably in such a wide temperature range.

[0026] In the embodiment: by setting the diaphragm main part 150 as a dished diaphragm, compared with the traditional flat membrane, the dished diaphragm deforms more uniformly under pressure change, the stress distribution is reasonable, and the local fatigue risk is reduced. The edge is thickened and provided with a sealing lip 162, which is closely fitted with the valve seat 110. The lip has an annular groove 163, which is filled with a high-temperature and radiation-resistant sealing glue 164, which strengthens the sealing effect and solves the problem that neither metal diaphragm nor elastomer diaphragm can guarantee long-term stable sealing in aerospace extreme environment. Metal diaphragm is prone to fatigue cracks, and elastomer diaphragm is prone to outgassing, hardening or embrittlement under high vacuum and extreme temperature, which increases the risk of medium leakage, which is a serious hidden problem for space missions.

[0027] Embodiment two, the embodiment is intended to promote the solution to the problem that the traditional metal diaphragm valve may chemically react with some corrosive aerospace media such as strong oxidizing propellant, affecting the structural integrity of the valve. The embodiment is an improvement based on embodiment 1. For details, please refer to Figures 1-4 The annular groove 163 is filled with sealing glue 164, and the sealing glue 164 is high-temperature and corrosion-resistant sealing glue.

[0028] The diaphragm body 150 comprises a first membrane 151 and a second membrane 152, which are jointly connected to the end of the valve rod 140, and are made of high-temperature and radiation-resistant polyimide fiber fabric. A metal foil 153 is connected between the first membrane 151 and the second membrane 152. The outer side of the first membrane 151 and the second membrane 152 is provided with a fluororubber coating 154.

[0029] The valve body 120 and the diaphragm of the aerospace diaphragm valve can be made of various high-performance corrosion-resistant materials, such as polytetrafluoroethylene and polyimide, which can resist the corrosion of strong acid, strong alkali, oxidizing agent and other corrosive media, and adapt to the complex chemical environment in the aerospace field. In comparison, some ordinary metal valves are prone to corrosion damage when facing strong corrosive media, affecting the service life and system performance.

[0030] In this embodiment, the diaphragm body 150 is made of high-temperature and radiation-resistant polyimide fiber fabric, and adopts a multi-layer composite structure. The base layer is high-strength, high-temperature and radiation-resistant polyimide fiber fabric, which provides structural support and can withstand a wide temperature range of -200℃ to 250℃ and space radiation. The surface is coated with a corrosion-resistant and high-elasticity fluororubber coating 154 to cope with corrosive media such as rocket propellants and ensure good sealing. The metal foil 153 is sandwiched in the middle to enhance the compression and puncture resistance.

[0031] It should be noted that in this document, relational terms such as first and second and the like can only be used to distinguish one entity or action from another entity or action, without necessarily requiring or implying any such actual relationship or order between such entities or actions. Moreover, the terms "comprises", "comprising", or any other variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements recited, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus.

[0032] The above description is only a preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and refinements can be made, which should be considered as the protection scope of the present application.

Claims

1. A high corrosion resistant diaphragm valve comprising a valve seat (110), characterized in that: The valve seat (110) is provided with a valve body (120) on one side, the valve body (120) is provided with a valve cover (130) on one side, the valve cover (130) is connected with a valve rod (140), the valve seat (110) is internally provided with a cavity (144), the valve rod (140) is provided with a diaphragm body (150) on one side, and the diaphragm body (150) is used in cooperation with the cavity (144).

2. A high corrosion resistant diaphragm valve according to claim 1, characterized in that: The valve seat (110) is provided with an inlet groove (161) and an outlet groove (160) on one side, and the inlet groove (161), the outlet groove (160) and the cavity (144) are communicated.

3. A high corrosion resistant diaphragm valve according to claim 1, characterized in that: The valve seat (110) is made of aviation aluminum alloy.

4. A high corrosion resistant diaphragm valve according to claim 1, characterized in that: The diaphragm body (150) is a butterfly diaphragm, and a sealing lip (162) is connected to the outside of the diaphragm body (150), and the sealing lip (162) is tightly matched with the cavity (144).

5. A highly corrosion resistant diaphragm valve according to claim 4, characterized in that: The sealing lip (162) is internally provided with an annular groove (163) filled with sealing glue (164), and the sealing glue (164) is high-temperature-resistant and corrosion-resistant.

6. A high corrosion resistant diaphragm valve according to claim 1, characterized in that: The diaphragm body (150) comprises a first membrane (151) and a second membrane (152), the first membrane (151) and the second membrane (152) are connected to the end of the valve rod (140), and the first membrane (151) and the second membrane (152) are made of high-temperature-resistant and radiation-resistant polyimide fiber fabric.

7. A highly corrosion resistant diaphragm valve according to claim 6, characterized in that: The first membrane (151) and the second membrane (152) are connected with a metal foil (153).

8. A high corrosion resistant diaphragm valve according to claim 6, characterized in that: The first membrane (151) and the second membrane (152) are provided with a fluororubber coating (154) on the outside.

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