Miniature welding type high-temperature-resistant one-way valve

Abstract

A miniature welding type high-temperature-resistant one-way valve comprises a valve body, a filler neck and a moving assembly. The moving assembly comprises a guide sleeve, a spring and a steel ball; a guide cavity, a liquid cavity, a conical cavity and a valve body inlet pipeline communicated with the conical cavity are sequentially arranged in the valve body; the filler neck comprises a limiting step, a spring seat and an outlet pipeline; the spring seat is inserted into the guide cavity and is welded with the outer end surface of the guide cavity through the limiting step; the guide sleeve is of a stepped cylinder structure with a through inner cavity, a steel ball installation groove is formed in the small cylinder end face, a plurality of through holes are evenly distributed in the radial direction, and a large cylinder inner cavity is a spring cavity. The large cylinder is placed in the valve body guide cavity and is in movement fit with the valve body guide hole to play a guide role, a spring is mounted between the spring cavity and the spring seat, and the steel ball is placed in the steel ball mounting groove and is in contact fit with the conical cavity wall under the action of the spring to realize sealing; when a working medium flows into the inlet pipeline, the steel ball is pushed to overcome spring force to open under the pressure of the working medium, and the working medium flows out of the outlet pipeline.

Description

Technical Field

[0001] The present invention belongs to the field of valve structure, and relates to a micro welded high temperature resistant one-way valve, which is suitable for high temperature fluid circuit systems that cannot provide fixed support, to ensure the one-way flow of high heat flux density working fluids. Background Art

[0002] The miniaturization design of high-temperature fluid circuit system is the development trend of modern fluid circuit system. The principle is that the monocomponent working fluid flows through the catalyst to generate high-temperature and high-pressure gas to start the high-temperature fluid circuit system. In order to ensure the normal operation of the high-temperature fluid circuit system and avoid the reverse flow of the monocomponent working fluid to squeeze the upstream liquid supply tank, a one-way valve is required at the inlet (outlet) of the catalyst to prevent the monocomponent working fluid from flowing in reverse.

[0003] The traditional one-way valve body and the take-over nozzle are screwed together, and an aluminum gasket is used to prevent external leakage. Due to the limit of the allowable sealing pressure ratio of the aluminum gasket, the tightening torque between the valve body and the take-over nozzle is too small (3.5N·m). During the assembly of the high-temperature fluid circuit system, the tightening torque between the inlet and outlet take-over nozzles and the system pipeline is as high as 12N·m. During the installation process, it is very easy to loosen the one-way valve's own torque, causing the aluminum gasket seal to fail. The traditional one-way valve is connected to the system pipeline using a ball head seal. This results in the one-way valve being too long, with an outer diameter and a mass. During the system assembly process, it must be fixed with a special fixed support to prevent the one-way valve from leaking out of the single-component working fluid due to excessive instantaneous impact during system operation, which causes the ball head seal to loosen. Summary of the invention

[0004] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a micro welded high temperature resistant one-way valve.

[0005] The technical solution of the present invention is: a micro welded high temperature resistant one-way valve, including a valve body, a nozzle, and a moving component; the moving component is composed of a guide sleeve, a spring and a steel ball;

[0006] The valve body is provided with a guide cavity, a liquid cavity and a conical cavity in sequence, and a valve body inlet pipeline connected with the conical cavity; the pipe nozzle includes a limit step, a spring seat and an outlet pipeline; the spring seat is inserted into the guide cavity and is welded with the outer end face of the guide cavity through the limit step; the guide sleeve is a stepped cylindrical structure with a through inner cavity, a steel ball mounting groove is provided on the end face of the small cylinder and a plurality of through holes are evenly distributed radially, and the inner cavity of the large cylinder is a spring cavity; the large cylinder is placed in the valve body guide cavity and cooperates with the movement of the valve body guide cavity to play a guiding role, a spring is installed between the spring cavity and the spring seat, the steel ball is placed in the steel ball mounting groove and contacts and cooperates with the conical cavity wall under the action of the spring to achieve sealing; when a working medium flows into the inlet pipeline, the steel ball is pushed under the medium pressure to overcome the spring force and move toward the direction of the pipe nozzle spring seat and is limited by the spring seat, the working medium enters the liquid cavity from the conical cavity, enters the spring cavity from the liquid cavity through the through hole, and finally flows out from the outlet pipeline to achieve a one-way conduction function.

[0007] Preferably, the distance between the outer end surface of the spring seat and the limiting step welding position is not less than 3.6 mm, so that the welding heat affected zone between the valve body and the nozzle completely avoids the movement area of ​​the guide sleeve.

[0008] Preferably, the outlet pipeline of the take-over nozzle and the inlet pipeline of the valve body are extended or shortened according to the use requirements of the high-temperature fluid circuit system.

[0009] Preferably, the outlet pipeline of the nozzle, the inlet pipeline of the valve body and the butt pipeline of the high-temperature fluid circuit system are connected by lock bottom welding.

[0010] Preferably, the valve body inlet pipeline is inserted into the high-temperature fluid circuit system connecting pipeline for bottom lock welding, and the high-temperature fluid circuit system connecting pipeline is inserted into the connecting nozzle outlet pipeline for bottom lock welding.

[0011] Preferably, the wall thickness of the valve body guide cavity is (1.5-2) mm, the outer edge of the valve body guide cavity and the limiting step of the nozzle are welded by vacuum electron beam welding, and the weld penetration is (1-1.1) mm.

[0012] Preferably, a cone angle-steel ball metal sealing pair is used to achieve sealing between the steel ball and the conical cavity; the steel ball is made of G95Cr18 and the valve body is made of 1Cr18Ni9Ti, which are compatible with the working fluid and resistant to high temperature; the working fluid includes DT-3, anhydrous hydrazine, hydrazine 70, and aminohydrazine 75.

[0013] Preferably, the guide cavity and the tapered cavity in the valve body adopt a unified positioning reference during the machining process, which can improve the coaxiality of the guide cavity and the tapered cavity.

[0014] Preferably, the valve body inlet pipeline and the nozzle outlet pipeline have the same diameter, and the total flow area of ​​the tapered cavity, liquid cavity, and through hole should not be less than twice the cross-sectional area of ​​the valve body inlet pipeline.

[0015] Preferably, the sealing position between the conical cavity and the steel ball is at 1 / 2 to 2 / 3 of the diameter of the steel ball.

[0016] The beneficial effects of the present invention compared with the prior art are:

[0017] (1) The micro-welded high-temperature resistant one-way valve of the present invention has a light and compact structure, which reduces both its own weight and the weight supported by the high-temperature fluid circuit system (hereinafter referred to as the system). The net weight of the one-way valve body is only 4g, which is only 1 / 3 of the weight of the traditional one-way valve (the traditional one-way valve is 12g). The inlet and outlet of the one-way valve are connected to the system docking pipe by welding (the plug and outer sleeve nut save 9.1g compared with the traditional one-way valve). The one-way valve is used in the system assembly process without fixed support (the traditional fixed support including the fixing screw is 5.35g). Compared with the screw-on one-way valve, the micro-welded one-way valve can reduce the weight by 22.45g (including 8g for itself, 5.35g for the support, and 9.1g for the plug seal), meeting the lightweight and miniaturized use requirements of the new system.

[0018] (2) The present invention is a micro welded high temperature resistant one-way valve using all-metal materials and a cone angle-steel ball metal sealing pair, which can meet the high temperature sealing performance. The one-way valve uses a sealing form in which the steel ball matches the conical cavity wall surface on the nozzle, combined with specific material selection, to ensure that the one-way valve can still effectively seal the liquid (250°C) or high temperature gas (650°C) high temperature working medium in a high temperature environment, and is first-level compatible with the working medium (DT-3, anhydrous hydrazine, hydrazine 70, aminohydrazine 75).

[0019] (3) The present invention provides a micro welded high temperature resistant one-way valve, which optimizes the size parameters of the welding part between the valve body guide cavity and the limit step of the pipe nozzle, so that the movement area of ​​the guide sleeve avoids the welding heat affected zone, and the guide sleeve can still move flexibly in the guide cavity after welding. The valve body of the one-way valve and the pipe nozzle are welded by vacuum electron beam, and the upper limit step of the pipe nozzle realizes the bottom locking function, which improves the installation accuracy of the parts before welding, reduces the welding difficulty, and can avoid the valve body guide cavity ablation or weld splash during welding. Compared with the traditional screw-on one-way valve, this welding form improves the assembly adaptability of the one-way valve, and the position accuracy of the one-way valve guide part and the conical valve seat only depends on the machining accuracy, and will not be affected by the external thread torque. Compared with the screw-on one-way valve, the sealing effect under reverse 0.6MPa compressed air can reach (0~0.1)ml / s.

[0020] (4) The miniature welded high-temperature resistant one-way valve of the present invention reduces the outer diameter and length of the valve body, improves the strength of the valve body in the guide part, reduces the weight of the valve body, and realizes the installation of the one-way valve in the power system without fixed support. The upper limit step of the nozzle realizes the bottom locking function. The outer diameter of the product is reduced to 2 / 3 of the traditional one-way valve, and the body length is shortened to 1 / 2 of the traditional one-way valve. The maximum outer diameter of the valve body is only 9mm, the body length is 15.6mm, and the body weight is only 4g. The wall thickness of the guide cavity of the one-way valve is 1.5 times that of the traditional screw-on one-way valve, and the single-side wall thickness is as high as 2.1mm. It can adapt to stronger impact and vibration environments during the operation of the power system without deformation. The one-way valve can be fixed after the inlet and outlet pipelines are welded to the system docking pipelines, without the need to add fixed supports, which facilitates the flexible layout of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural cross-sectional view of the present invention.

[0022] Figure 2 It is a structural cross-sectional view of the motion component of the present invention;

[0023] Figure 3 It is a structural cross-sectional view of the valve body of the present invention;

[0024] Figure 4 It is a structural cross-sectional view of the nozzle of the present invention;

[0025] Figure 5 It is a structural cross-sectional view of the guide sleeve of the present invention;

[0026] 1. Valve body; 2. Take-off nozzle; 3. Moving components; 3.1 Guide sleeve; 3.2 Spring; 3.3 Steel ball; DETAILED DESCRIPTION

[0027] Combine the following Figure 1-5 The present invention is further described with reference to the accompanying drawings and embodiments.

[0028] The present invention designs a micro-welded high-temperature resistant one-way valve according to the use requirements of the high-temperature fluid circuit system. The valve is kept in a forward open state during the operation of the high-temperature fluid circuit to ensure the forward flow of the high heat flux density working fluid; and is kept in a closed state during the locking of the high-temperature fluid circuit to prevent the reverse flow of the high heat flux density working fluid. The valve body and the take-over nozzle are connected by vacuum electron beam welding, which reduces the weight of the valve and reduces the overall size, so that it can be installed without support in the high-temperature fluid circuit system. The inlet and outlet pipelines of the micro-welded high-temperature resistant one-way valve are connected to the system pipeline by plug-in lock bottom welding, which improves the sealing reliability of the product in the high-temperature fluid circuit system. The micro-welded high-temperature resistant one-way valve adopts all-metal materials and cone angle-steel ball metal sealing pairs to meet high-temperature sealing performance.

[0029] like Figure 1-3As shown, the present invention is a micro welded high temperature resistant one-way valve, which comprises a valve body 1, a nozzle 2, and a moving component 3; the moving component is composed of a guide sleeve 3.1, a spring 3.2 and a steel ball 3.3;

[0030] A guide cavity, a liquid cavity and a conical cavity are sequentially arranged inside the valve body, as well as a valve body inlet pipeline connected with the conical cavity; the pipe nozzle comprises a limiting step, a spring seat and an outlet pipeline; the spring seat is inserted into the guide cavity and is welded to the outer end face of the guide cavity through the limiting step; the guide sleeve is a stepped cylindrical structure with a through inner cavity, a steel ball mounting groove is arranged on the end face of the small cylinder and a plurality of through holes are evenly distributed radially, and the inner cavity of the large cylinder is a spring cavity; the large cylinder is placed in the guide cavity of the valve body and cooperates with the movement of the guide hole of the valve body to play a guiding role, a spring is installed between the spring cavity and the spring seat, the steel ball is placed in the steel ball mounting groove and contacts and cooperates with the conical cavity wall under the action of the spring to achieve sealing; when a working medium flows into the inlet pipeline, the steel ball is pushed to overcome the spring force to move toward the direction of the spring seat of the pipe nozzle under the working medium pressure, and is limited by the spring seat, the working medium enters the liquid cavity, enters the spring cavity through the through hole from the liquid cavity, and finally flows out from the outlet pipeline to achieve a one-way conduction function.

[0031] The transfer process of a micro welded high temperature resistant one-way valve of the present invention is as follows: first, a steel ball is placed in the conical cavity of the valve body; a guide sleeve is inserted into the guide cavity of the valve body, and the steel ball installation groove on the guide sleeve is in contact with the steel ball; one end of the spring is placed in the spring cavity of the guide sleeve; one side of the nozzle spring seat is inserted into the guide cavity of the valve body, and the other end of the spring is placed in the nozzle spring seat, and fixed by the nozzle limit step; the outer edge of the valve body guide cavity and the nozzle limit step are vacuum electron beam welded, and the weld penetration is (1-1.1) mm. At this point, the assembly of the micro welded high temperature resistant one-way valve is completed.

[0032] The working principle of the micro welded high temperature resistant one-way valve described in the present invention is as follows: during the operation of the high temperature fluid circuit system, the high pressure working medium acts on the steel ball through the valve body inlet pipeline, and the steel ball pushes the guide sleeve under the action of the working medium pressure to overcome the spring force and move in the direction of the nozzle spring seat, and is limited by the spring seat; at this time, the one-way valve is opened, and the working medium enters the liquid cavity from the conical cavity of the valve body, enters the spring cavity from the liquid cavity through the through hole, and finally flows out from the outlet cavity. During the locking period of the high temperature fluid circuit system, the high pressure working medium stops supplying; the spring force acts on the steel ball through the guide sleeve, so that the steel ball is sealed in the conical cavity of the valve body; at this time, the one-way valve is closed to prevent the working medium in the downstream pipe of the high temperature heat flow circuit system from flowing in reverse, and the sealing effect can reach (0-0.1) ml / s. At this point, the one-way valve realizes the one-way conduction function.

[0033] In the present invention, the distance between the outer end face of the spring seat and the limit step welding point is not less than 3.6 mm, so that the welding heat affected zone between the valve body and the nozzle completely avoids the movement area of ​​the guide sleeve. The outlet pipeline of the nozzle and the inlet pipeline of the valve body are extended or shortened according to the use requirements of the high-temperature fluid circuit system. The nozzle outlet pipeline, the valve body inlet pipeline and the high-temperature fluid circuit system docking pipeline are connected by lock bottom welding. The valve body inlet pipeline is inserted into the high-temperature fluid circuit system docking pipeline for lock bottom welding, and the high-temperature fluid circuit system docking pipeline is inserted into the nozzle outlet pipeline for lock bottom welding. The wall thickness of the valve body guide cavity is (1.5~2) mm, the outer edge of the valve body guide cavity and the nozzle limit step are welded by vacuum electron beam welding, and the weld penetration is (1~1.1) mm. The steel ball and the conical cavity are sealed by a cone-steel ball metal seal pair; the steel ball is made of G95Cr18 and the valve body is made of 1Cr18Ni9Ti, which are compatible with the working fluid and resistant to high temperature; the working fluids include DT-3, anhydrous hydrazine, hydrazine 70, and aminohydrazine 75. The guide cavity and the conical cavity in the valve body adopt a unified positioning reference during the machining process, which can improve the coaxiality of the guide cavity and the conical cavity. The valve body inlet pipeline and the nozzle outlet pipeline have the same diameter, and the total flow channel area of ​​the conical cavity, liquid cavity, through hole, etc. should not be less than twice the cross-sectional area of ​​the valve body inlet pipeline. The sealing position of the conical cavity and the steel ball is 1 / 2 to 2 / 3 of the diameter of the steel ball.

[0034] The invention discloses a micro welded high temperature resistant one-way valve with lightweight design and assembly adaptability design, which reduces the outer diameter and length of the valve body, improves the valve body strength at the guide part, reduces the valve body weight, and realizes the installation of the one-way valve in the power system without fixed support.

[0035] The present invention discloses a micro welded high temperature resistant one-way valve with a lightweight design: the net weight of the one-way valve body is only 4g, which is only 1 / 3 of the weight of the traditional one-way valve (the traditional one-way valve is 12g). The inlet and outlet of the one-way valve are connected to the system docking pipe by welding (the plug and the outer sleeve nut save 9.1g compared with the traditional one-way valve). The one-way valve does not require fixed support during system assembly (the traditional fixed support including the fixing screw is 5.35g). Compared with the screw-on one-way valve, the micro welded one-way valve can reduce the weight by 22.45g (including 8g weight reduction for itself, 5.35g weight reduction for support, and 9.1g weight reduction for plug seal), which meets the use requirements of the new system for lightweight and miniaturization, and reduces both its own weight and the support weight of the high temperature fluid circuit system (hereinafter referred to as the system).

[0036] The miniature welded high temperature resistant one-way valve of the present invention has a miniaturized design: the outer diameter of the product is reduced to 2 / 3 of the traditional one-way valve, and the body length is shortened to 1 / 2 of the traditional one-way valve. The maximum outer diameter of the valve body is only 9mm, and the body length is 15.6mm. The one-way valve can be fixed after the inlet and outlet extension pipelines are welded to the assembly pipeline, without adding fixed supports, which is convenient for the flexible layout of the power system.

[0037] The micro welded high temperature resistant one-way valve of the present invention is designed for high temperature sealing adaptability, reliability and assembly adaptability.

[0038] The present invention discloses a micro welded high temperature resistant one-way valve with high temperature sealing adaptability design: it adopts all-metal materials and cone angle-steel ball metal sealing pair to meet high temperature sealing performance. The one-way valve adopts a sealing form in which the steel ball (made of G95Cr18) and the conical cavity wall of the take-over nozzle (made of 1Cr18Ni9Ti) cooperate, ensuring that the one-way valve can still effectively seal the liquid (250℃) or high temperature gas (650℃) high temperature working medium under high temperature environment, and the sealing effect can reach (0~0.1)ml / s under reverse 0.6MPa compressed air.

[0039] The invention discloses a micro welded high temperature resistant one-way valve with reliability design: the wall thickness of the one-way valve guide cavity is 1.5 times that of the traditional screw-on one-way valve, and the single-side wall thickness is as high as 2.1 mm. It can adapt to stronger impact and vibration environment during the operation of the power system without deformation; the materials of various components of the one-way valve are first-level compatible with the working fluid (DT-3, anhydrous hydrazine, hydrazine 70, aminohydrazine 75); the dimensional parameters of the welding part between the valve body guide cavity and the limit step of the take-off nozzle are optimized (the dimensional parameter optimization content is that the distance between the outer end face of the spring seat and the limit step welding part is not less than 3.6 mm, and the weld penetration is (1 to 1.1) mm.), so that the movement area of ​​the guide sleeve avoids the welding heat affected zone, and the guide sleeve can still move flexibly in the guide cavity after welding.

[0040] The present invention discloses a micro welded high temperature resistant one-way valve designed for assembly adaptability: the one-way valve body and the nozzle are welded by vacuum electron beam, and the upper limit step of the nozzle realizes the bottom locking function, which improves the installation accuracy of the parts before welding, reduces the welding difficulty, and can avoid the valve body guide cavity ablation or weld nodule splashing during welding. Compared with the traditional screw-on one-way valve, this welding form improves the assembly adaptability of the one-way valve.

[0041] Although the present invention has been disclosed as above in the form of a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications to the technical solution of the present invention by using the methods and technical contents disclosed above without departing from the spirit and scope of the present invention. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the protection scope of the technical solution of the present invention.

Claims

1. A micro welded high temperature resistant one-way valve, characterized in that it comprises a valve body, a nozzle, and a moving component; the moving component is composed of a guide sleeve, a spring and a steel ball; The valve body is provided with a guide cavity, a liquid cavity and a conical cavity in sequence, and a valve body inlet pipeline connected with the conical cavity; the pipe nozzle includes a limit step, a spring seat and an outlet pipeline; the spring seat is inserted into the guide cavity and is welded with the outer end face of the guide cavity through the limit step; the guide sleeve is a stepped cylindrical structure with a through inner cavity, a steel ball mounting groove is provided on the end face of the small cylinder and a plurality of through holes are evenly distributed radially, and the inner cavity of the large cylinder is a spring cavity; the large cylinder is placed in the valve body guide cavity and cooperates with the movement of the valve body guide cavity to play a guiding role, a spring is installed between the spring cavity and the spring seat, the steel ball is placed in the steel ball mounting groove and contacts and cooperates with the conical cavity wall under the action of the spring to achieve sealing; when a working medium flows into the inlet pipeline, the steel ball is pushed under the medium pressure to overcome the spring force and move toward the direction of the pipe nozzle spring seat and is limited by the spring seat, the working medium enters the liquid cavity from the conical cavity, enters the spring cavity from the liquid cavity through the through hole, and finally flows out from the outlet pipeline to achieve a one-way conduction function.

2. A micro welded high temperature resistant one-way valve according to claim 1, characterized in that: The distance between the outer end surface of the spring seat and the limit step welding position is not less than 3.6 mm, so that the welding heat affected zone between the valve body and the nozzle completely avoids the movement area of ​​the guide sleeve.

3. A micro welded high temperature resistant one-way valve according to claim 1, characterized in that: The outlet pipeline of the take-over nozzle and the inlet pipeline of the valve body are extended or shortened according to the use requirements of the high-temperature fluid circuit system.

4. A micro welded high temperature resistant one-way valve according to claim 3, characterized in that: The outlet pipeline of the take-off nozzle, the inlet pipeline of the valve body and the butt pipeline of the high-temperature fluid circuit system are connected by lock bottom welding.

5. A micro welded high temperature resistant one-way valve according to claim 4, characterized in that: The valve body inlet pipeline is inserted into the high-temperature fluid circuit system connecting pipeline for bottom locking welding, and the high-temperature fluid circuit system connecting pipeline is inserted into the nozzle outlet pipeline for bottom locking welding.

6. The micro welded high temperature resistant one-way valve according to claim 1, characterized in that: The wall thickness of the valve body guide cavity is (1.5-2) mm, the outer edge of the valve body guide cavity and the limiting step of the nozzle are welded by vacuum electron beam welding, and the weld penetration is (1-1.1) mm.

7. The micro welded high temperature resistant one-way valve according to claim 1, characterized in that: The steel ball and the conical cavity are sealed by a cone angle-steel ball metal sealing pair; the steel ball is made of G95Cr18 and the valve body is made of 1Cr18Ni9Ti, which are compatible with the working fluid and resistant to high temperature; the working fluid includes DT-3, anhydrous hydrazine, hydrazine 70, and aminohydrazine 75.

8. The micro welded high temperature resistant one-way valve according to claim 1, characterized in that: The guide cavity and the tapered cavity in the valve body adopt a unified positioning reference during the machining process, which can improve the coaxiality of the guide cavity and the tapered cavity.

9. The micro welded high temperature resistant one-way valve according to claim 1, characterized in that: The valve body inlet pipeline and the nozzle outlet pipeline have the same diameter, and the total flow area of ​​the tapered cavity, liquid cavity and through hole should not be less than twice the cross-sectional area of ​​the valve body inlet pipeline.

10. The micro welded high temperature resistant one-way valve according to claim 1, characterized in that: The sealing position between the conical cavity and the steel ball is at 1 / 2 to 2 / 3 of the diameter of the steel ball.

Images