A control valve with enhanced mechanical impact resistance structure

Abstract

The control valve with enhanced mechanical impact resistance structure of the present invention is used to solve the technical problems of valve body leakage or valve body coil frame root fracture, and improve the mechanical impact resistance performance of the control valve structure without changing the overall structure of the existing control valve. The control valve of the present invention includes a valve body, a valve seat, a valve core, a coil and a shell. The valve body is provided with a valve body end, a magnetic isolation ring and a flange from top to bottom in sequence; a first annular shoulder is provided on the outer side of the circumference of the valve body end; a second annular shoulder is provided along the circumferential radial direction of the flange; an annular coil groove is formed between the first annular shoulder, the valve body end, the magnetic isolation ring and the second annular shoulder, and the vertical distance from the upper end of the bottom surface of the annular coil groove to the valve body axis is less than the vertical distance from the lower end to the valve body axis; the coil is surrounded in the annular coil groove; the shell and the first annular shoulder, the coil and the second annular shoulder form a first cavity, and are filled with ring square glue to solidify the valve body, the coil and the shell into one.

Description

Technical Field

[0001] The invention relates to a liquid rocket attitude control engine system, and in particular to a control valve with a structure enhanced to resist mechanical impact. Background Art

[0002] Liquid rocket attitude control engines have strict requirements on the miniaturization and lightweight of control valves. When designing control valves, in addition to meeting their various performance requirements, it is also necessary to reduce the volume and weight of the control valves. For this reason, control valves usually adopt an integrated design concept of valve body and coil skeleton. The valve body serves as a structural pressure-bearing part and also assumes the function of the coil skeleton to wind the coil, thus realizing the two functions of the product at the same time. At present, many control valves have gradually developed into mature shelf products.

[0003] In recent years, the mechanical shock magnitude of liquid rocket attitude control engines has been increasing year by year, especially the shock magnitude of about 1000Hz, which has gradually increased from 6000g to 12000g, which has put forward higher requirements for the mechanical environmental adaptability of the control valve. After the mechanical shock occurs, the existing control valve is prone to valve body leakage or valve body coil skeleton root fracture, which shows that the product has a reduced margin in terms of mechanical environmental adaptability, which directly affects the reliability of the liquid rocket attitude control engine. If the control valve is redesigned or the valve body wall thickness is increased, on the one hand, it cannot meet the requirements of the overall size and weight, and on the other hand, all identification tests and flight tests must be re-verified, which is costly. How to improve the mechanical shock resistance of the existing liquid rocket attitude control engine control valve without changing the product performance, volume and weight has become a key problem that needs to be solved in the field of liquid rocket attitude control engines. Summary of the invention

[0004] The present invention provides a control valve with an enhanced mechanical impact resistance structure, which is used to solve the technical problems of valve body leakage or valve body coil frame root fracture after the control valve is subjected to an impact mechanical environment. Without changing the material, performance, volume and weight of the existing liquid rocket attitude control engine control valve, the mechanical impact resistance of the control valve structure is greatly improved.

[0005] To achieve the above object, the technical solution of the present invention is as follows:

[0006] A control valve with enhanced mechanical impact resistance structure, comprising a valve body, a valve seat, a valve core, a coil and a housing, and its special features are:

[0007] The valve body includes a medium inlet, a first channel, a valve core mounting hole and a valve seat mounting hole arranged in sequence from top to bottom; the valve core is placed in the valve core mounting hole, the valve seat is placed in the valve seat mounting hole, and a medium outlet is arranged in the valve seat along the axial direction;

[0008] The valve body is provided with a valve body end, a magnetic isolation ring and a flange in sequence from top to bottom; a first annular shoulder is provided on the outer side of the circumference of the valve body end; a second annular shoulder is provided on the outer side of the upper part of the flange along the circumferential radial direction; an annular coil groove is formed between the first annular shoulder, the valve body end, the magnetic isolation ring and the second annular shoulder, the groove bottom surface of the annular coil groove is a conical surface, and the vertical distance from the upper end of the groove bottom surface to the valve body axis is smaller than the vertical distance from the lower end to the valve body axis; the coil is surrounded in the annular coil groove;

[0009] The shell, the first annular shoulder, the coil, and the second annular shoulder form a first cavity, the first cavity is filled with annular glue, and a glue injection through hole is radially provided on the shell of the shell. The annular glue enters the first cavity through the glue injection through hole to solidify the valve body, the coil and the shell into one.

[0010] Furthermore, the housing and the first annular shoulder and the second annular shoulder are all subjected to interference crimping with an interference amount of 0.01 to 0.035 mm. After the interference crimping, laser welding is used to fix the crimping surfaces, thereby improving the overall stability of the control valve.

[0011] Furthermore, the angle φ between the bottom surface of the groove and the axis of the valve body is 3° to 5°; the two ends of the bottom surface of the groove are respectively transitioned with the first annular shoulder and the second annular shoulder by a rounded corner with R of 0.5 mm. This structure is simple to process and avoids the phenomenon of coil staggering during the winding process. Under the condition that the overall size, weight and other parameters of the existing control valve remain unchanged, the coil space is greatly utilized, and the goal of high filling rate of the electromagnetic coil is achieved.

[0012] Furthermore, a second channel corresponding to the first channel is provided inside the valve core, and a spring assembly is provided between the first channel and the second channel; the valve body, the valve core and the valve seat form a second cavity; a plurality of side flow channels are provided at the lower part of the valve core; one end of the side flow channel is connected to the second channel, and the other end is connected to the second cavity; the medium enters from the medium inlet, enters the second cavity through the first channel, the second channel and the side flow channel, and finally flows out from the medium outlet.

[0013] Furthermore, the inner side wall of the shell is provided with a lead groove in the axial direction, and the shell of the shell is provided with a wire outlet hole in the radial direction, one end of the wire outlet hole is communicated with the lead groove, and the other end is fixedly connected with a socket; the wire outlet end of the coil passes through the lead groove and is connected to the pin of the socket after passing through the wire outlet hole.

[0014] Furthermore, a sealing block is provided between the valve core and the medium outlet of the valve seat to constitute an internal seal of the control valve; a convex ring is provided at the upper end of the valve seat, and an adjusting gasket is provided between the upper end of the convex ring and the flange to constitute an external seal of the control valve, thereby improving the sealing performance of the overall structure of the control valve.

[0015] Furthermore, the spring assembly comprises a cylindrical spring and a disc spring, wherein the disc spring is sleeved on the outside of the cylindrical spring and is located between the lower end surface of the valve body end and the upper end surface of the valve core.

[0016] Furthermore, the number of the glue injection through holes is 2, and they are symmetrically distributed along the axis of the valve body.

[0017] Furthermore, the ring square glue is made of bisphenol-A type epoxy resin, m-phenylenediamine, dibutyl phthalate, and fused periclase powder, which is not only beneficial to the heat dissipation of the control valve, but also can prevent the control valve from being affected by moisture in the coil.

[0018] Furthermore, the valve body end, valve core, housing and flange are all made of soft magnetic alloy; the magnetic isolation ring is made of stainless steel; and the sealing block is made of plastic or rubber.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] 1. The control valve of the present invention adopts the window design technology of the annular coil groove without changing the material, performance, volume and weight of the existing control valve. The angle φ between the bottom surface of the annular coil groove and the axis of the valve body is 3-5°. This design changes the coil skeleton from a right-angle cylindrical structure to a trapezoidal cylindrical structure, that is, the upper cylinder is small and the lower cylinder is large, and an inclined surface (that is, the bottom surface of the groove is a conical surface) is used for transition in the middle. The trapezoidal cylinder structure is simple to process. At the same time, since the arrangement of each layer of the coil is continuous, there is no phenomenon of coil staggered during the winding process. Under the condition that the existing window height remains unchanged, the coil space is greatly utilized, and the goal of high filling rate of the electromagnetic coil is achieved, thereby realizing the improvement of the mechanical impact resistance of the control valve structure.

[0021] 2. In the control valve of the present invention, the groove bottom surface of the annular coil groove is respectively connected to the first annular shoulder and the second annular shoulder with a fillet transition of R of 0.5 mm; at the same time, the outer shell and the first annular shoulder and the second annular shoulder are connected by an "interference + welding" method to solidify the entire valve body into a whole, and the first cavity surrounded by the outer shell, the first annular shoulder, the coil and the second annular shoulder is filled with annular glue, which further enhances the overall rigidity of the valve body, thereby improving the control valve's ability to resist mechanical impact.

[0022] 3. In the control valve of the present invention, a sealing block is provided between the medium outlet of the valve core and the valve seat to constitute the internal seal of the control valve; a convex ring is provided at the upper end of the valve seat, and an adjusting gasket is provided between the upper end of the convex ring and the flange to constitute the external seal of the control valve, thereby greatly improving the overall sealing performance of the control valve.

[0023] 4. The mechanical impact performance of the control valve of the present invention can be increased from 6000g to more than 12000g, the control valve works reliably, and a design with enhanced mechanical environmental adaptability is achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a structural cross-sectional view of a control valve with enhanced mechanical impact resistance according to an embodiment of the present invention.

[0025] Figure 2 The present invention is a schematic diagram of a valve body structure of a control valve with enhanced mechanical impact resistance according to an embodiment of the present invention.

[0026] Figure 3 The present invention is a schematic diagram of the outer shell structure of a control valve with enhanced mechanical impact resistance according to an embodiment of the present invention.

[0027] In the figure:

[0028] 1-valve body, 2-valve seat, 3-adjusting gasket, 4-valve core, 5-cylindrical spring, 6-disc spring, 7-coil, 8-socket, 9-housing, 10-medium inlet, 11-valve body end, 12-magnetic isolation ring, 13-flange, 14-valve core mounting hole, 15-valve seat mounting hole, 16-first annular shoulder, 17-second annular shoulder, 18-groove bottom, 19-ring square glue, 20-glue filling hole, 21-wire outlet hole, 22-lead groove, 23-first cavity, 24-sealing block, 25-first channel, 26-second channel, 27-second cavity, 28-side flow channel, 29-medium outlet, 30-convex ring. DETAILED DESCRIPTION

[0029] In order to make the purpose, advantages and features of the present invention clearer, the following is a further detailed description of a mechanical impact-resistant structure-enhanced control valve proposed by the present invention in combination with the accompanying drawings and specific embodiments. According to the following specific implementation methods, the advantages and features of the present invention will be clearer. The accompanying drawings are simplified in form and use non-precise proportions, which are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present invention. It should be noted that the terms "upper", "upper end", "upper part", etc. used in the present invention refer to the side close to the medium inlet, "lower", "lower end", "lower part", etc. refer to the side close to the medium outlet, and the terms "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] like Figure 1 , Figure 2As shown, the present invention provides a control valve with enhanced mechanical impact resistance structure, including a valve body 1, a valve seat 2, a valve core 4, a coil 7 and a shell 9. The valve body 1 includes a medium inlet 10, a first channel 25, a valve core mounting hole 14 and a valve seat mounting hole 15 arranged in sequence from top to bottom; the valve core 4 is placed in the valve core mounting hole 14, the valve seat 2 is placed in the valve seat mounting hole 15, and a medium outlet 29 is axially arranged in the valve seat 2; in this embodiment, the valve seat 2 is selected from other metal materials except soft magnetic alloy, and the valve core 4 and the shell 9 are selected from soft magnetic alloy materials.

[0031] The valve body 1 is provided with a valve body end 11, a magnetic isolation ring 12 and a flange 13 from top to bottom. The valve body end 11 and the flange 13 are made of soft magnetic alloy, and the magnetic isolation ring 12 is made of stainless steel. A first annular shoulder 16 is provided on the outer circumference of the valve body end 11, and a second annular shoulder 17 is provided on the outer circumference of the upper part of the flange 13. An annular coil groove is formed between the first annular shoulder 16, the valve body end 11, the magnetic isolation ring 12 and the second annular shoulder 17. The groove bottom surface 18 of the annular coil groove is a conical surface, and the vertical distance from the upper end of the groove bottom surface 18 to the axis of the valve body 1 is smaller than the vertical distance from the lower end to the axis of the valve body 1. In this embodiment, the angle φ between the groove bottom surface 18 and the axis of the valve body 1 is 3° to 5°, that is, the valve body 1 with the annular coil groove is a trapezoidal cylinder structure, the upper end of the trapezoidal cylinder structure is small, the lower end is large, and the middle is transitioned by an inclined surface (that is, the groove bottom surface 18 is a conical surface), and the coil 7 is wound in the annular coil groove with a whole copper wire; the two ends of the groove bottom surface 18 are respectively transitioned with the first annular shoulder 16 and the second annular shoulder 17 by a fillet with R of 0.5mm. The housing 9 and the first annular shoulder 16, the coil 7, and the second annular shoulder 17 form a first cavity 23, and the first cavity 23 is filled with a ring square glue 19, which is made of bisphenol-A type epoxy resin, m-phenylenediamine, dibutyl phthalate, and fused periclase powder. The trapezoidal cylinder structure design, rounded corner transition design, and the design of filling the first cavity 23 with square rubber enhance the rigidity of the valve body as a whole, thereby improving the control valve's ability to resist mechanical impact.

[0032] like Figure 3 As shown, the shell 9 is provided with glue injection holes 20 in the radial direction. In this embodiment, the number of the glue injection holes 20 is 2, the diameter d is 3 mm, and they are symmetrically distributed along the axis of the valve body 1. The ring-shaped glue 19 enters the first cavity 23 through one of the glue injection holes 20, and the valve body 1, the coil 7 and the shell 9 are solidified into one. When the ring-shaped glue 19 flows out from the other glue injection hole 20, it means that the first cavity 23 has been filled with the ring-shaped glue 19, thereby realizing the design that the valve body 1, the coil 7 and the shell 9 are solidified into one, and preventing the control valve from breaking when subjected to strong mechanical impact.

[0033] The shell 9 and the first annular shoulder 16 and the second annular shoulder 17 are all press-fitted with interference, and the interference amount is 0.01 to 0.035 mm. After the interference press-fitting, laser welding is used to fix the press-fitted surfaces. Three 8 mm long welds with a penetration depth of not less than 0.2 mm are evenly distributed on the circumference of the press-fitted surface. If a continuous weld structure is used, the heat generated by welding may damage the performance of the internal coil. In this embodiment, discontinuous spot welding or segmented welding is selected.

[0034] Combination Figure 1 and Figure 3 As shown, the inner wall of the shell 9 is also provided with a lead groove 22 along the axial direction, and the shell of the shell 9 is provided with a wire outlet hole 21 along the radial direction. One end of the wire outlet hole 21 is communicated with the lead groove 22, and the other end is connected to the socket 8. The copper wire ends (two ends) of the wound coil 7 pass through the lead groove 22 on the shell 9, and then pass through the wire outlet hole 21, and are respectively welded to the pins of the socket 8. The socket 8 and the shell 9 are fixed by screws, and an asbestos pad is also provided therebetween. The provision of the asbestos pad not only improves the sealing of the device, but also plays a buffering role, thereby avoiding the situation where the socket 8 is loosened due to direct contact between the socket 8 and the shell 9 when the control valve is subjected to mechanical impact, and the control valve cannot work normally.

[0035] like Figure 1 As shown, a second channel 26 corresponding to the first channel 25 is provided inside the valve core 4, and a spring assembly is provided between the first channel 25 and the second channel 26. The spring assembly includes a cylindrical spring 5 and a disc spring 6. The disc spring 6 is sleeved outside the cylindrical spring 5 and is located between the lower end surface of the valve body end 11 and the upper end surface of the valve core 4. The valve body 1, the valve core 4, and the valve seat 2 form a second cavity 27; a plurality of side flow channels 28 are provided at the lower part of the valve core 4, one end of the side flow channel 28 is connected to the second channel 26, and the other end is connected to the second cavity 27. The medium enters from the medium inlet 10, passes through the first channel 25, the second channel 26 and the side flow channel 28, reaches the second cavity 27, and finally flows out from the medium outlet 29.

[0036] A sealing block 24 is provided between the valve core 4 and the medium outlet 29 of the valve seat 2, constituting the inner seal of the control valve. The sealing block 24 is made of plastic or rubber. A convex ring 30 is provided at the upper end of the valve seat 2, and an adjusting gasket 3 is provided between the upper end of the convex ring 30 and the flange 13, constituting the outer seal of the control valve. The combination of the inner seal and the outer seal improves the sealing performance of the control valve structure and avoids the phenomenon of medium leakage after the control valve is subjected to strong mechanical impact.

[0037] The working principle of the control valve with enhanced mechanical impact resistance structure of the present invention is:

[0038] When the coil 7 is energized, the valve core 4 overcomes the spring force of the cylindrical spring 5 and the disc spring 6 and the medium force under the action of the electromagnetic attraction, and moves upward along the central axis of the valve body 1. At this time, the valve core 4 is separated from the valve seat 2, and the medium enters from the medium inlet 10, passes through the first channel 25 and the side flow channel 28 of the valve core 4, and reaches the second cavity 27, and then flows out from the second cavity 27 through the medium outlet 29 in the valve seat 2.

[0039] When the coil 7 is powered off, the electromagnetic attraction acting on the valve core 4 disappears. At this time, under the combined action of the spring force of the cylindrical spring 5 and the disc spring 6 and the medium force, the valve core 4 moves downward along the central axis of the valve body 1, and the sealing block 24 blocks the medium outlet 29 between the valve seat 2 to form a sealing pair, thereby cutting off the outflow of the medium.

[0040] The product of the present invention has undergone multiple batches of product production test assessments, and has undergone inspection tests, typical tests, single-machine mechanical environment tests, transportation vibration, random vibration, sinusoidal vibration, acceleration, low-frequency impact and high-frequency impact tests and other experimental assessments, wherein the high-frequency impact magnitude is all above 12000g. After the mechanical environment test, the control valve structure is intact and the performance meets the system design requirements; in addition, the product has undergone multiple test runs and flight test assessments, and the control valve works reliably, realizing a design with enhanced mechanical environment adaptability.

[0041] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A control valve with enhanced mechanical impact resistance structure, comprising a valve body (1), a valve seat (2), a valve core (4), a coil (7) and a housing (9), characterized in that: The valve body (1) comprises a medium inlet (10), a first channel (25), a valve core mounting hole (14) and a valve seat mounting hole (15) arranged in sequence from top to bottom; the valve core (4) is placed in the valve core mounting hole (14), the valve seat (2) is placed in the valve seat mounting hole (15), and a medium outlet (29) is axially arranged in the valve seat (2); The valve body (1) is provided with a valve body end (11), a magnetic isolation ring (12) and a flange (13) in order from top to bottom; a first annular shoulder (16) is provided on the outer circumference of the valve body end (11); a second annular shoulder (17) is provided on the outer circumference of the upper part of the flange (13); an annular coil groove is formed between the first annular shoulder (16), the valve body end (11), the magnetic isolation ring (12) and the second annular shoulder (17); The groove bottom surface (18) of the coil groove is a conical surface, and the vertical distance between the upper end of the groove bottom surface (18) and the axis of the valve body (1) is smaller than the vertical distance between the lower end and the axis of the valve body (1); the coil (7) is surrounded in the annular coil groove; the angle φ between the groove bottom surface (18) and the axis of the valve body (1) is 3° to 5°; the two ends of the groove bottom surface (18) are respectively connected to the first annular shoulder (16) and the second annular shoulder (17) with a fillet transition of R of 0.5 mm; The housing (9) and the first annular shoulder (16) and the second annular shoulder (17) are all press-fitted by interference, and after the press-fitting, the press-fitted surfaces are fixed by laser welding. The outer shell (9), the first annular shoulder (16), the coil (7) and the second annular shoulder (17) form a first cavity (23). The first cavity (23) is filled with annular glue (19). A glue injection through hole (20) is radially provided on the shell of the outer shell (9). The annular glue (19) enters the first cavity through the glue injection through hole (20) to solidify the valve body (1), the coil (7) and the outer shell (9) into one body.

2. The control valve with enhanced mechanical impact resistance structure according to claim 1, characterized in that: The interference between the housing (9) and the first annular shoulder (16) and the second annular shoulder (17) is 0.01 to 0.035 mm.

3. The control valve with enhanced mechanical impact resistance structure according to claim 2, characterized in that: A second channel (26) corresponding to the first channel (25) is provided inside the valve core (4), and a spring assembly is provided between the first channel (25) and the second channel (26); The valve body (1), the valve core (4) and the valve seat (2) form a second cavity (27); A plurality of side flow channels (28) are provided at the lower part of the valve core (4); one end of the side flow channel (28) is connected to the second channel (26), and the other end is connected to the second cavity (27); a medium enters from the medium inlet (10), enters the second cavity (27) through the first channel (25), the second channel (26) and the side flow channel (28), and finally flows out from the medium outlet (29).

4. The control valve with enhanced mechanical impact resistance structure according to claim 3, characterized in that: The inner side wall of the outer shell (9) is provided with a lead groove (22) along the axial direction; the shell of the outer shell (9) is provided with a wire outlet hole (21) along the radial direction, one end of the wire outlet hole (21) is communicated with the lead groove (22), and the other end is fixedly connected to the socket (8); the wire outlet end of the coil (7) passes through the lead groove (22) and the wire outlet hole (21) and is connected to the pin of the socket (8).

5. The control valve with enhanced mechanical impact resistance structure according to claim 4, characterized in that: A sealing block (24) is provided between the valve core (4) and the medium outlet (29) of the valve seat (2) to form an internal seal of the control valve; A convex ring (30) is provided at the upper end of the valve seat (2), and an adjusting gasket (3) is provided between the upper end of the convex ring (30) and the flange (13), forming an external seal of the control valve.

6. The control valve with enhanced mechanical impact resistance structure according to claim 5, characterized in that: The spring assembly comprises a cylindrical spring (5) and a disc spring (6), wherein the disc spring (6) is sleeved on the outside of the cylindrical spring (5) and is located between the lower end surface of the valve body end (11) and the upper end surface of the valve core (4).

7. The control valve with enhanced mechanical impact resistance structure according to claim 6, characterized in that: The number of the glue injection through holes (20) is 2 and they are symmetrically distributed along the axis of the valve body (1).

8. The control valve with enhanced mechanical impact resistance structure according to claim 7, characterized in that: The ring square glue (19) is prepared by using bisphenol-A type epoxy resin, m-phenylenediamine, dibutyl phthalate and fused periclase powder.

9. The control valve with enhanced mechanical impact resistance structure according to claim 8, characterized in that: The valve body end (11), valve core (4), housing (9) and flange (13) are all made of soft magnetic alloy; The material of the magnetic isolation ring (12) is stainless steel; The sealing block (24) is made of plastic or rubber.

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