CN208996824U - Ultralow temperature band pooling feature piston makees dynamic formula high pressure valve - Google Patents

Abstract

A kind of ultralow temperature band pooling feature piston actuation high pressure valve, including entrance multilayer shell component and outlet housing component；Outlet housing component includes outlet housing etc.；Outlet housing is structure as a whole, including shell, guide cylinder, and shell is stretched out in syphon shape, guide cylinder one end from shell one end port, and the other end is stretched out from the barrel at shell turning；Leakage hole leads to shell exterior from guide cylinder side wall, blows down mouth and is located on shell barrel, corresponding with shell other end port；Piston rod is mounted in guide cylinder, and control chamber cover board is mounted on one end that guide cylinder stretches out shell barrel, is provided with control mouth at control chamber cover plate central；Second auxiliary spring is installed on the piston rod；Outlet housing is connected with entrance multilayer shell port, and guide cylinder is inserted into main valve.The utility model can realize the matching optimization of flow resistance loss under valve actuation mechanism and leakproofness, big flow, meet high operating condition and multiple reusable needs.

Description

Ultralow temperature piston-actuated high-pressure valve with buffering function

Technical Field

The utility model relates to a piston actuation formula high pressure valve.

Background

Under the conditions of small structural size and low working pressure of the valve, the low-temperature valve of the traditional liquid engine in China generally adopts a bellows actuating structure to isolate and control gas and low-temperature medium and realize the function of dynamic sealing. Under the working conditions of larger structural size and higher working pressure of the valve, the design and forming difficulty of the corrugated pipe is increased, the cost is extremely high, the production flow of the corrugated pipe assembly is complex, the period is very long, the corrugated pipe actuation mode is continuously selected and is difficult to adapt to the development requirement of the oxyhydrogen engine valve, and the piston actuation mode with a simpler structure is selected.

In order to ensure reliable closing of the valve and to protect the structural parts from damage, the valve is usually commanded to close after the pressure of the medium has decreased to a certain extent. The valve is reliably closed in a slow buffer mode under the rated highest pressure of the main stage so as to protect structural parts and nonmetal sealing parts and prevent the impact of water hammer pressure generated when the main stage is closed on a valve pipeline, and the requirements are difficult to meet by the existing valve technology.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is: overcome prior art's is not enough, the utility model provides a large-traffic piston actuation formula high pressure valve who takes buffer function of ultra-low temperature, adaptable about 23MPa higher pressure, ultra-low temperature medium (liquid oxygen or liquid nitrogen 90K 76K), about 390kg/s (liquid oxygen medium) of super large flow, be not more than 1 MPa's flow resistance loss, and possess and prevent to close the buffer gear of water hammer pressure and protection non-metallic seal face at the process of opening and close, can realize that the valve actuates mechanism and leakproofness, the matching of flow resistance loss is optimized under the large-traffic, satisfy high operating mode and repetitious usage's needs.

The utility model adopts the technical proposal that: an ultralow temperature piston-actuated high-pressure valve with a buffer function comprises an inlet multilayer shell component and an outlet shell component;

the outlet shell assembly comprises an outlet shell, a control cavity cover plate, a piston rod and a second auxiliary spring;

the outlet shell is of an integrated structure and comprises a shell and a guide cylinder, wherein the shell is in a bent pipe shape, one end of the guide cylinder extends out of a port at one end of the shell, the other end of the guide cylinder extends out of the cylinder wall at the turning position of the shell, and the diameter of one end of the guide cylinder extending out of the cylinder wall of the shell is larger than that of the end extending out of the port of the shell; the leakage port is led out of the outer shell from the side wall of the guide cylinder, and the blowing port is positioned on the wall of the outer shell and corresponds to the port at the other end of the outer shell;

the piston rod is arranged in the guide cylinder, the control cavity cover plate is arranged at one end of the guide cylinder, which extends out of the cylinder wall of the shell, a control opening is formed in the center of the control cavity cover plate, one end, close to the control cavity cover plate, of the piston rod is matched with the inner wall of the guide cylinder to form a dynamic sealing structure, and the guide cylinder controls the stroke of the large end of the piston rod through a first step structure of the inner wall;

the second secondary spring is arranged on the piston rod and is positioned between the step structure on the outer wall of the piston rod and the second step structure on the inner wall of the guide cylinder; the outlet housing is connected to the inlet multi-layer housing port and the guide cylinder is inserted into the main valve.

The outlet shell component further comprises a first sealing ring and a second sealing ring, the first sealing ring is installed between the piston rod and the inner wall of the guide cylinder, and the piston rod is sealed between the end, extending out from the guide cylinder, of the piston rod and the guide cylinder through the second sealing ring to form dynamic sealing.

A nonmetal sealing ring is embedded in the step surface of the outer wall of the piston rod, and the guide cylinder is matched with the nonmetal sealing ring of the piston rod through an annular convex structure on the step surface of the first step structure to form a redundant sealing structure.

The diameter of one end of the guide cylinder extending out of the wall of the shell ranges from 90mm to 100mm, and the diameter of one end of the guide cylinder extending out of the port of the shell ranges from 50mm to 60 mm; one end of the guide cylinder extends 60mm-70mm from the port of the shell, and the other end of the guide cylinder extends 60mm-80mm from the cylinder wall at the turning position of the shell.

The diameter of the port at one end of the outlet shell connected with the inlet multilayer shell ranges from 190mm to 210mm, and the diameter of the port at the other end ranges from 120mm to 150 mm.

The inlet multilayer housing assembly includes: the valve comprises an inlet multilayer shell, a main valve seat, a main spring, an auxiliary valve, an auxiliary spring and a pin; wherein,

the inlet multilayer housing includes: the guide cone is arranged on the outer wall of the shell; wherein,

the outer wall of the shell is connected with the diversion cone through a plurality of rib plates;

the diversion cone is positioned inside the outer wall of the shell;

the plurality of rib plates are uniformly distributed along the circumferential direction of the outer wall of the shell;

one end of the guide wall of the main valve is connected with the inner wall of the guide cone;

one end of the auxiliary guide wall is connected with the inner wall of the guide cone, and the auxiliary guide wall is positioned inside the main valve guide wall;

the main valve comprises a sealing part, a main guide part and an auxiliary guide part; wherein the sealing portion, the main guide portion and the sub guide portion are integrally formed;

the auxiliary valve is embedded in the auxiliary guide part, and the auxiliary spring is sleeved at one end of the auxiliary valve;

the auxiliary guide part is provided with a limiting hole, and the pin penetrates through the auxiliary valve and is clamped in the limiting hole;

one end of the auxiliary guide part is embedded in the auxiliary guide wall;

the main guide part is embedded in the main valve guide wall;

the main spring is sleeved on the guide wall of the main valve, one end of the main spring is attached to the spring support seat, and the other end of the main spring is attached to the side wall of the sealing part;

the main valve seat is in threaded connection with the outer wall of the shell, and the main valve seat is attached to the sealing part.

The axis of the outer wall of the shell, the axis of the diversion cone, the axis of the guide wall of the main valve and the axis of the auxiliary guide wall are overlapped.

The profile of the guide cone is similar to a parabola.

The inner wall of the diversion cone is provided with a spring support seat, and one end of the guide wall of the main valve is connected with the spring support seat.

The inner wall of the diversion cone is provided with an auxiliary valve seat, and the cone head of the diversion cone is provided with a through hole along the axis.

Compared with the prior art, the utility model the advantage lie in:

(1) the utility model discloses a split type package assembly, assembly manufacturability is good, but the maintenance testability is all better. The valve structure is suitable for supplying or cutting off liquid oxygen medium to flow into a combustion chamber of an engine and has a buffering function. Can be applied to the high-tech fields of aerospace low-temperature liquid power and the like.

(2) The utility model discloses a whole valve compact structure, the design is exquisite, and core spare part is located valve body central point and puts, can realize the axial-flow type flow of high pressure, ultra-low temperature medium, reaches the valve and actuates the optimal configuration between mechanism and the flow resistance, and the casing inner chamber is arranged in to core operating mechanism, has greatly alleviateed the size weight of whole product to can satisfy the needs of high operating mode and repetitious repetition reliable use.

(3) The utility model discloses set up and slowly open, slowly close mechanism, utilize the medium can not press the characteristic, do not increase and realize main valve motion buffer function under the independent spare part condition, the valve closes main valve even removing control gas under rated operating mode, construct the effect through slowly closing, make its main valve reliably and buffer the formula at a slow speed and close under the rated maximum pressure of primary, with protective structure spare, non-metallic sealing member and prevent to produce the impact of water hammer pressure to the valve pipeline when the primary is closed, improve the operational reliability of relevant spare part.

(4) The utility model discloses a piston actuates the structure, compares with bellows dynamic seal, and the advantage is that simple structure does not receive the stroke restriction, and processing cycle is short, and the shortcoming can not reach zero leakage magnitude like bellows dynamic seal structure, and consequently the leakage rate of strict control manipulation gas medium is very critical. In the export casing subassembly, stretch out the guide cylinder outside the shell, avoid with ultra-low temperature medium direct contact, improve the temperature interval of direction department, for the piston moves seal structure and provides good temperature environment, prevent that the too big action reliability that causes of the too low control gas leakage rate of temperature from reducing. In addition, the nonmetal sealing ring of the piston rod is matched with a sealing pair formed by the guide cylinder through the annular convex structure to form a redundant sealing structure, so that the leakage amount of control gas can be further controlled. Even if the part of the operating gas which leaks out slightly can be led out to the external environment through the leakage port L on the outlet shell, and the safe and reliable work of the valve is ensured.

(5) The utility model discloses an entry multilayer casing, export casing are the superalloy steel material, and the number of piles is more, the structure is complicated, overall dimension is great, have adopted novel advanced 3D to print technology forming technique, realize the innovation of large-scale complicated casing manufacturing process and use, have promoted production efficiency greatly.

Drawings

Fig. 1 is a schematic view of the high pressure valve structure of the present invention.

Fig. 2 is the working process schematic diagram of the high pressure valve of the present invention.

Fig. 3 is a schematic structural view of the outlet housing assembly of the present invention.

Fig. 4 is a schematic view of the structure of the outlet casing of the present invention.

Fig. 5 is a schematic view of the open state of the auxiliary valve of the present invention.

Fig. 6 is a schematic view of the closed state of the auxiliary valve of the present invention.

Fig. 7 is a schematic structural view of the buffer-type main valve seat of the present invention.

Fig. 8 is a schematic structural view of the inlet multilayer housing assembly of the present invention.

Fig. 9 is a cross-sectional view of the inlet multilayer housing of the present invention.

Fig. 10 is an isometric view of the inlet multilayer housing of the present invention.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and examples.

As shown in figure 1, the ultra-low temperature piston actuated high pressure valve with the buffer function comprises an inlet multilayer shell component 3 and an outlet shell component 6, wherein the inlet multilayer shell component and the outlet multilayer shell component are connected and statically sealed through threads and aluminum gaskets. The whole valve is assembled in a split mode, and after the two components are assembled at normal temperature and tested to be qualified, the reliability of static sealing at low temperature is guaranteed through welding.

As shown in fig. 9, the inlet multilayer casing 13 includes: the outer wall 131 of the shell, the guide cone 132, the main shutter guide wall 133, the auxiliary guide wall 134 and a plurality of rib plates 1311. Wherein, the outer wall 131 of the casing is connected with the guide cone 132 through a plurality of rib plates 1311. In specific implementation, the outer wall 131 of the casing, the plurality of rib plates 1311 and the guide cone 132 are integrally formed. The deflector cone 132 is located inside the housing outer wall 131. In specific implementation, the guiding cone 132 is located inside the outer wall 131 of the housing, the axis of the outer wall 131 of the housing coincides with the axis of the guiding cone 132, and a space is formed between the guiding cone 132 and the outer wall 131 of the housing for the liquid medium to flow through. A plurality of rib plates 1311 are distributed along the circumferential direction of the outer wall 131 of the casing. In specific implementation, the plurality of rib plates 1311 are uniformly distributed along the circumferential direction of the outer wall 131 of the casing.

One end of the main shutter guide wall 133 is connected to the inner wall of the guide cone 132. In specific implementation, the right end of the main shutter guide wall 133 is connected to the inner wall of the guide cone 132, and is integrally formed.

One end of the sub guide wall 134 is connected to the inner wall of the guide cone 132, and the sub guide wall 134 is located inside the main shutter guide wall 133. In specific implementation, the right end of the sub guide wall 134 is connected to the inner wall of the guide cone 132, and is also integrally formed, and the sub guide wall 134 is located inside the main shutter guide wall 133. The axis of the pilot cone 132, the axis of the main shutter guide wall 133, and the axis of the sub guide wall 134 coincide.

The effect that makes water conservancy diversion awl and shell outer wall be connected and make multilayer casing integration is reached through a plurality of gusset to this embodiment, improves compact structure nature, reduces the spare part quantity, improves whole valve design reliability.

In the above embodiment, the profile of the guide cone 132 is parabolic-like. The embodiment achieves the effects of stabilizing the flow field, enabling the low-temperature medium to flow in an axial flow manner and reducing the flow resistance loss through the diversion cone.

In the above embodiment, the outer wall 131 of the casing, the guide cone 132, the guide wall 133 of the main valve, the auxiliary guide wall 134 and the plurality of rib plates 1311 are made of high-temperature alloy steel, so that the effects of improving the pressure-bearing capacity of the casing, reducing the wall thickness, improving the forming manufacturability and reducing the weight of the casing are achieved.

In the above embodiment, as shown in fig. 9, the inner wall of the deflector cone 132 is provided with a spring support 1310, and one end of the main shutter guide wall 133 is connected to the spring support 1310. In specific implementation, the spring support 1310 disposed on the inner wall of the guiding cone 132 is a circular plane, and is used for pressing against the main spring 1 described later. The right end of the main shutter guide wall 133 is connected to the spring support 1310.

In the above embodiment, as shown in fig. 9, the inner wall of the guiding cone 132 is provided with the sub-valve seat 137, and the cone head of the guiding cone 132 is provided with the through hole 21 along the axis. In specific implementation, the auxiliary valve seat 137 disposed on the inner wall of the guiding cone 132 is an inclined surface, and can be used for pressing against an auxiliary valve 7 described later, and the low-temperature medium flowing into the auxiliary guiding wall 134 can flow through the through hole 21 formed in the cone head of the guiding cone 132.

In the above embodiment, the main shutter guide wall 133 has a cylindrical shape with an inner diameter of 60mm to 75 mm. The sub guide wall 134 has a cylindrical shape with an inner diameter of 25mm to 30 mm.

In the above embodiment, the diameter of one port of the outer wall 131 of the housing is 120mm to 150mm, and the diameter of the other port of the outer wall 131 of the housing is 200mm to 250 mm. In specific implementation, the diameter of the right port of the outer wall 131 of the housing is 120mm-150mm, and the diameter of the left port of the outer wall 131 of the housing is 200mm-250 mm. The shape of the outer wall 131 of the housing is half of a waist drum shape, so that the outer wall of the housing can be well matched with the guide vertebrae, and resistance is reduced.

In the above embodiment, as shown in fig. 9, the body of the guide cone 132 is provided with a plurality of first pressure balance holes 22 along the circumferential direction thereof. After the main valve, which will be described later, is opened, the low-temperature medium smoothly enters the inner cavity of the guiding cone 132 through the first pressure balance holes 22, so that the internal and external pressures of the main valve are balanced (preventing a large pressure difference from affecting the separation of the main valve), and the purposes of full replacement and pre-cooling can be achieved.

The main shutter guide wall 133 is provided with a plurality of second pressure equalizing holes 32 along its circumference. The second pressure balance holes 32 are provided to allow the low temperature liquid medium to smoothly enter and fill the slow opening region inside the guide wall 133 of the main valve, and the second pressure balance holes 32 can be covered after the main valve moves for a certain stroke, so that the liquid medium in the slow opening region cannot flow out as soon as possible to achieve the liquid damping effect.

As shown in fig. 10, the present embodiment provides that the inlet multilayer casing 13 has a semi-waist drum-like configuration in the shape of a multilayer circular ring in cross section; the structure comprises a shell outer wall 131, a diversion cone 132, a main valve guide wall 133 and an auxiliary guide wall 134 which are four layers from outside to inside. The inner three-layer structure is connected with the outer wall 131 of the shell as a whole through 4 rib plates 1311 and is integrally formed. The main core parts are arranged in the shell, so that the axial size and the number of components can be reduced. Between the main shutter guide wall 133 and the sub guide wall 134 is a buffer area 136.

The outer wall 131 of the housing takes on the high pressure bearing function of the housing and protects the housing from being damaged by high pressure media. In addition, the wide opening end (left end in fig. 9) of the outer wall of the shell is of an inner and outer double-thread structure, so that the connection function is borne, and the support is provided for the main valve seat. The advantage of this design lies in reducing the flange structure and lightening casing weight, can also be more convenient reprocesses main valve seat, and maintainability is good, and the reliability is high.

The main channel between the outer wall 131 of the casing and the diversion cone 132 is streamline design, the diversion cone is arranged at the inlet, the ring areas of all the sections of the flow channel are basically the same and larger than the drift diameter of the inlet, and the flow field action can be stabilized to reduce the flow resistance loss.

The material of the inlet multilayer shell 13 of the embodiment is high-strength high-temperature alloy steel, and is manufactured by adopting integral precision casting molding or novel advanced processes such as powder metallurgy and 3D printing, so that the high-strength, light-weight, precise and reliable design of the multilayer complex shell is realized.

The utility model discloses a setting up slowly opens the device and realizes the liquid damping effect not increasing independent spare part, protects each structure and does not receive the impact. The slow opening device comprises a main valve 4, an auxiliary valve 7, an auxiliary spring 9 and a pin 8, wherein the main valve 4 moves in cooperation with a main valve guide wall 133, and the auxiliary valve 7 moves in cooperation with an auxiliary guide wall 134.

As shown in fig. 8, the inlet multilayer housing assembly 3 includes an inlet multilayer housing 13, a main shutter 4, a main valve seat 5, a main spring 1, a sub shutter 7, a sub spring 9, and a pin 8. The specific implementation process of the inlet multilayer housing 13 may refer to the above description, and this embodiment is not described herein again.

The main shutter 4 includes a sealing part 410, a main guide part 420, and a sub guide part 430; wherein the sealing part 410, the main guide part 420 and the sub guide part 430 are integrally formed; the auxiliary valve 7 is embedded in the auxiliary guide part 430, and the auxiliary spring 9 is sleeved at one end of the auxiliary valve 7; the auxiliary guide part 430 is provided with a limit hole 440, and the pin 8 penetrates through the auxiliary valve 7 and is clamped in the limit hole 440; one end of the sub guide part 430 is embedded in the sub guide wall 134; the main guide part 420 is embedded in the main shutter guide wall 133; the main spring 1 is sleeved on the main valve guide wall 133, one end of the main spring 1 is attached to the spring support 1310, and the other end of the main spring 1 is attached to the side wall of the sealing part 410; the main valve seat 5 is screwed to the outer wall 131 of the housing, and the main valve seat 5 is fitted to the seal portion 410.

As shown in fig. 3, the outlet housing assembly 6 includes an outlet housing 15, a control chamber cover plate 14, a piston rod 10, a second secondary spring 11, a first seal ring 12, and a second seal ring 2; as shown in fig. 4, the outlet housing 15 is an integral structure, and includes a housing 151 and a guiding cylinder 152, the housing 151 is in an L-shaped bent tube shape, one end of the guiding cylinder 152 extends from a port at one end of the housing 151, the other end extends from a tube wall at a turn of the housing 151, and a diameter of an end of the guiding cylinder 152 extending from the tube wall of the housing 151 is larger than a diameter of an end extending from the port of the housing 151; the leakage port is led out of the outer shell 151 from the side wall of the guide cylinder 152, and the blow-off port is positioned on the wall of the outer shell 151 and corresponds to the port at the other end of the outer shell 151; the piston rod 10 is arranged in the guide cylinder 152, the control cavity cover plate 14 is arranged at one end of the guide cylinder 152 extending out of the wall of the shell 151, a control opening is formed in the center of the control cavity cover plate 14, one end, close to the control cavity cover plate 14, of the piston rod 10 is matched with the inner wall of the guide cylinder 152 to form a dynamic sealing structure, a first sealing ring 12 is arranged between the piston rod 10 and the inner wall of the guide cylinder 152, and the guide cylinder 152 controls the stroke of the large end of the piston rod 10 through a first step structure 1521 of the inner; the second secondary spring 11 is arranged on the piston rod 10 and is positioned between the step structure of the outer wall of the piston rod 10 and the second step structure 1522 of the inner wall of the guide cylinder 152; the first step structure 1521 is close to the large end of the guide cylinder 152, and the second step structure 1522 is close to the small end of the guide cylinder 152; one end of the piston rod 10 extending out of the guide cylinder 152 is sealed with the guide cylinder 152 through a second sealing ring 2 to form dynamic sealing; the outlet housing 15 is connected to the inlet housing 13, and the guide cylinder 152 is inserted into the main guide portion 420 of the main shutter 4. The nonmetal sealing ring is embedded in the step surface of the outer wall of the piston rod 10, and the guide cylinder 152 is matched with the nonmetal sealing ring of the piston rod 10 through the annular convex structure to form a redundant sealing structure.

The diameter of the end of the guide cylinder 152 extending out of the wall of the shell 151 is 90mm-100mm, and the diameter of the end extending out of the port of the shell 151 is 50mm-60 mm.

The diameter of one port (outlet B) of the outlet shell 15 ranges from 120mm to 150mm, and the diameter of the port connected with the inlet multilayer shell 13 ranges from 190mm to 210 mm; one end of the guide cylinder 152 extends 60mm-70mm from the port of the shell 151, and the other end extends 60mm-80mm from the wall of the turning part of the shell 151.

The inlet multilayer shell 13 is provided with a flow guide cone, the molded surfaces of the medium channel and the main valve 4 are in streamline design, the flow field can be stabilized to prevent the medium from flowing to generate sudden change, the annular area of each section of the medium channel is not less than the diameter area of the inlet drift and is basically equivalent, and the design can greatly reduce the flow resistance loss.

The valve is assembled in a state that the main valve 4 is normally closed, and the main valve 4 is pressed on the main valve seat 5 under the action of the pre-tightening force of the main spring 1.

The working principle is as follows:

as shown in fig. 2, when the engine is precooled, the control gas is not communicated in the control cavity, the low-pressure liquid oxygen medium enters the inlet multilayer shell cavity from the inlet a, and the main valve 4 is pressed on the main valve seat 5 under the combined action of the medium force and the assembling force of the main spring 1 during precooling to ensure the sealing of the main valve 4. At this time, the sub-valve 7 is in an open position (as shown in fig. 5), and when precooling is performed, the low-temperature medium is ensured to enter a cavity (a cavity between the main valve 4 and the inlet multilayer shell 13) for slowly opening the main valve 4, so that the valve body is fully precooled.

After precooling is finished, when the engine sends an instruction and the valve needs to be opened, high-pressure control gas of the actuating cavity is introduced from the control port K, the piston rod 10 is pushed and overcomes the compression force of the main spring 1 and the second auxiliary spring 11 and the pressure difference force of the medium to move towards the direction of jacking the main valve 4. For avoiding main valve 4 to open when targetting in place the structure bears and produces too big impact stress, causes each structure damage, the valve has set up slowly opening structural design: the auxiliary valve 7 is connected with the main valve 4 through a pin 8, has a certain axial moving space, is propped against the auxiliary valve 7 to the right side position through the pretightening force of an auxiliary spring 9 and can move together with the main valve 4, the stroke of the auxiliary valve 7 is smaller than that of the main valve 4, when the auxiliary valve 7 firstly reaches a small valve seat 15 of an inlet multilayer shell 13, a small hole at the right end is sealed (as shown in figure 6), and at the moment, the main valve 4 still has a small stroke and continues to push rightwards. Because the liquid oxygen medium in the cavity (as shown in a region C in figure 2) formed between the main valve 4 and the 3 rd layer of the inlet multilayer shell 13 can only be extruded out through the annular gap between the main valve 4 and the inlet multilayer shell, the area of the annular gap is small, and the liquid oxygen medium can serve as a certain damping effect by virtue of the incompressible characteristic of the liquid, the opening duration of the residual stroke of the main valve 4 is prolonged, the slow opening effect is achieved, the structural components are protected from large impact force, and the use reliability of the valve is improved.

After the engine enters a rated working condition, the valve enters a high-pressure and high-flow working state, the control gas is kept at the moment, and the main valve 4 is kept in a fully open state.

When the engine sends a closing instruction, the valve is still in a high-pressure state, and the main valve 4 is closed under the combined action of the main spring 1 and the medium by removing the control gas. Produce too big water hammer pressure peak and cause big impact to valve spare part and system's pipeline when closing for avoiding the valve high pressure, designed the slow function of closing on the valve structure: in the process of starting closing, the gap between the main valve 4 and the extending part of the outlet shell assembly 6 is large, when the main valve is closed to the bottom, the gap is small, and the low-temperature liquid oxygen medium in the inner cavity (shown as a D area in figure 2) can not be pressed and can only be extruded out through the annular gap, so that the slow closing function of the main valve 4 is realized. The valve slow-closing structure is completely designed by means of the characteristic that the liquid medium can not be pressed, redundant damping parts are not required to be added, the system resistance is not increased, and the reliability of the valve can be improved.

When the main valve 4 is closed, because the working condition is still high at the moment, the nonmetal seal of the valve can exceed the allowable specific pressure of materials, and the buffer type main valve seat 5 is adopted to design and protect the nonmetal of the main valve from being crushed under the working condition: the double-channel metal valve seat is designed, the metal valve seat surface 51 on the outer side is slightly lower than the metal valve seat surface 52 on the inner side (the height difference delta is determined by calculating the deformation amount when the nonmetal is subjected to the allowable specific pressure), and when the nonmetal sealing specific pressure of the main valve reaches the value close to the allowable specific pressure, the metal valve seat surface 51 on the outer side and the metal of the main valve 4 are in contact with each other, so that the nonmetal of the main valve is buffered and protected. The schematic diagram is shown in fig. 7.

The valve actuating chamber part is provided with a leakage port which can discharge the control gas leaked from the actuating piston part and the low-temperature medium leaked from the dynamic sealing part of the ejector rod to the outside.

The non-detailed description of the present invention is well within the skill of those in the art.

Claims (9)

1. An ultralow-temperature piston-actuated high-pressure valve with a buffering function is characterized by comprising an inlet multilayer shell component (3) and an outlet shell component (6);

the outlet shell assembly (6) comprises an outlet shell (15), a control cavity cover plate (14), a piston rod (10) and a second auxiliary spring (11);

the outlet shell (15) is of an integral structure and comprises a shell (151) and a guide cylinder (152), wherein the shell (151) is in a bent pipe shape, one end of the guide cylinder (152) extends out of a port at one end of the shell (151), the other end of the guide cylinder extends out of the wall of the bent part of the shell (151), and the diameter of one end of the guide cylinder (152) extending out of the wall of the shell (151) is larger than that of the end extending out of the port of the shell (151); the leakage port is led out of the outer part of the shell (151) from the side wall of the guide cylinder (152), and the blow-off port is positioned on the cylinder wall of the shell (151) and corresponds to the port at the other end of the shell (151);

the piston rod (10) is installed in the guide cylinder (152), the control cavity cover plate (14) is installed at one end, extending out of the cylinder wall of the shell (151), of the guide cylinder (152), a control opening is formed in the center of the control cavity cover plate (14), one end, close to the control cavity cover plate (14), of the piston rod (10) is matched with the inner wall of the guide cylinder (152) to form a dynamic sealing structure, and the guide cylinder (152) controls the stroke of the large end of the piston rod (10) through a first step structure (1521) of the inner wall;

the second secondary spring (11) is arranged on the piston rod (10) and is positioned between the step structure of the outer wall of the piston rod (10) and the second step structure (1522) of the inner wall of the guide cylinder (152); the outlet shell (15) is connected with the port of the inlet multilayer shell (13), and the guide cylinder (152) is inserted into the main valve (4).

2. The ultra-low temperature piston actuated high pressure valve with buffer function of claim 1, wherein: the outlet shell assembly (6) further comprises a first sealing ring (12) and a second sealing ring (2), the first sealing ring (12) is installed between the piston rod (10) and the inner wall of the guide cylinder (152), and one end, extending out from the guide cylinder (152), of the piston rod (10) is sealed with the guide cylinder (152) through the second sealing ring (2) to form dynamic sealing.

3. The ultra-low temperature piston actuated high pressure valve with buffer function according to claim 1 or 2, wherein: the non-metal sealing ring is embedded into the step surface of the outer wall of the piston rod (10), and the guide cylinder (152) is matched with the non-metal sealing ring of the piston rod (10) through the annular convex structure on the step surface of the first step structure (1521) to form a redundant sealing structure.

4. The ultra-low temperature piston actuated high pressure valve with buffer function as claimed in claim 3, wherein: the diameter of one end of the guide cylinder (152) extending out of the wall of the shell (151) ranges from 90mm to 100mm, and the diameter of one end of the guide cylinder extending out of the port of the shell (151) ranges from 50mm to 60 mm; one end of the guide cylinder (152) extends 60mm-70mm from the port of the shell (151), and the other end extends 60mm-80mm from the wall of the turning part of the shell (151).

5. The ultra-low temperature piston actuated high pressure valve with buffer function as claimed in claim 4, wherein: the diameter of the port at one end, connected with the inlet multilayer shell (13), of the outlet shell (15) ranges from 190mm to 210mm, and the diameter of the port at the other end ranges from 120mm to 150 mm.

6. The ultra-low temperature piston actuated high pressure valve with buffer function of claim 1, wherein: the inlet multilayer housing assembly (3) comprises: the valve comprises an inlet multilayer shell (13), a main valve (4), a main valve seat (5), a main spring (1), an auxiliary valve (7), an auxiliary spring (9) and a pin (8);

the inlet multilayer casing (13) comprises: the guide cone structure comprises a shell outer wall (131), a guide cone (132), a main valve guide wall (133), an auxiliary guide wall (134) and a plurality of rib plates (1311); a spring support seat (1310) is arranged on the inner wall of the guide cone (132), and one end of the main valve guide wall (133) is connected with the spring support seat (1310);

the outer wall (131) of the shell is connected with the diversion cone (132) through a plurality of rib plates (1311);

the diversion cone (132) is positioned inside the shell outer wall (131);

the rib plates (1311) are uniformly distributed along the circumferential direction of the outer wall (131) of the shell;

one end of the main valve guide wall (133) is connected with the inner wall of the guide cone (132);

one end of the auxiliary guide wall (134) is connected with the inner wall of the guide cone (132), and the auxiliary guide wall (134) is positioned inside the main shutter guide wall (133);

the main shutter (4) comprises a sealing part (410), a main guide part (420) and a secondary guide part (430); wherein the sealing part (410), the main guide part (420) and the sub guide part (430) are integrally molded;

the auxiliary valve (7) is embedded in the auxiliary guide part (430), and the auxiliary spring (9) is sleeved at one end of the auxiliary valve (7);

the auxiliary guide part (430) is provided with a limiting hole (440), and the pin (8) penetrates through the auxiliary valve (7) and is clamped in the limiting hole (440);

one end of the auxiliary guide part (430) is embedded in the auxiliary guide wall (134);

the main guide part (420) is embedded in the main shutter guide wall (133);

the main spring (1) is sleeved on the main valve guide wall (133), one end of the main spring (1) is attached to the spring support seat (1310), and the other end of the main spring (1) is attached to the side wall of the sealing part (410);

the main valve seat (5) is in threaded connection with the outer wall (131) of the shell, and the main valve seat (5) is attached to the sealing portion (410).

7. The ultra-low temperature piston actuated high pressure valve with buffer function of claim 6, wherein: the axis of the outer shell wall (131), the axis of the guide cone (132), the axis of the main shutter guide wall (133) and the axis of the auxiliary guide wall (134) coincide.

8. The ultra-low temperature piston actuated high pressure valve with buffer function of claim 6, wherein: the profile of the guide cone (132) is similar to a parabola.

9. The ultra-low temperature piston actuated high pressure valve with buffer function of claim 6, wherein: the inner wall of the diversion cone (132) is provided with an auxiliary valve seat (137), and the cone head of the diversion cone (132) is provided with a through hole (21) along the axis.