CN212616576U

CN212616576U - Squirrel-cage flow regulating valve with regulating window

Info

Publication number: CN212616576U
Application number: CN202021795058.7U
Authority: CN
Inventors: 朱崇涛; 何海涛; 李健; 韩明晶; 刘岳; 翟致恒; 孙晓伟; 朱丹; 查雄权
Original assignee: CASIC Rocket Technology Co
Current assignee: CASIC Rocket Technology Co
Priority date: 2020-08-25
Filing date: 2020-08-25
Publication date: 2021-02-26
Anticipated expiration: 2030-08-25

Abstract

The utility model relates to a squirrel-cage flow regulating valve with a regulating window, which comprises an outer shell, a power component, a valve rod, a valve core and a valve seat, wherein the outer shell is provided with a hollow valve cavity, and the outer shell is provided with a valve rod port for installing the valve rod, an inlet for fluid inflow and an outlet for fluid outflow; the power assembly is used for driving the valve rod to move along the axial direction; the valve core is arranged at the other end of the valve rod, and a through hole for communicating the rod cavity and the rodless cavity is formed in the valve core; the valve seat is packaged in the valve cavity and is positioned through the outer shell, the valve seat is provided with an adjusting window, the power assembly drives the valve core to move up and down along the valve seat through the valve rod, and the displacement of the valve core determines the opening degree of the valve seat window. The utility model can weaken the oscillation condition of medium flow by setting the through holes to balance the force of the fluid acting on the valve core, thereby having better working stability; utilize power component to drive case linear motion, the accuracy is high. The variable-thrust liquid oxygen methane engine can be applied to a variable-thrust liquid oxygen methane engine, and the requirement of flow regulation precision is met.

Description

Squirrel-cage flow regulating valve with regulating window

Technical Field

The application belongs to the technical field of valves, and particularly relates to a squirrel-cage flow regulating valve with a regulating window.

Background

The traditional flow regulating valve mainly comprises a straight-through single-seat regulating valve, a straight-through double-seat regulating valve, a squirrel-cage regulating valve (also called a sleeve type regulating valve or a cage type regulating valve, and a valve seat of the single-seat valve and the double-seat valve is replaced by a sleeve), a cock type regulating valve, an angle type regulating valve and the like.

In reusable liquid rocket engines, regulation of engine thrust is implementation critical. And the flow regulation of the propellant by the regulating valve is a key component for realizing thrust regulation. The traditional regulating valve with the valve seat opening shape has poor linearity of flow characteristics, and abrupt change can be generated in thrust regulation change, so that the application of the traditional flow regulating valve in a variable-thrust liquid rocket engine is limited.

Disclosure of Invention

In order to solve the technical problem, the utility model provides a squirrel-cage flow control valve with adjustment window can be applied to liquid oxygen methane and become to push away in the engine, satisfies the demand of flow control precision.

Realize the utility model discloses technical scheme that the purpose adopted does, a squirrel-cage flow control valve with adjustment window, including shell body, power component, valve rod, case and disk seat, wherein:

the outer shell is provided with a hollow valve cavity, and the shell of the outer shell is provided with 3 openings for communicating the valve cavity with the outside, namely a valve rod port for installing a valve rod, an inlet for fluid inflow and an outlet for fluid outflow;

the power assembly is arranged outside the shell, and an output shaft of the power assembly is connected with one end of the valve rod and used for driving the valve rod to move along the axial direction;

the other end of the valve rod extends into the valve cavity through the valve rod port, and the valve rod is in clearance fit with the valve rod port;

the valve core is arranged at the other end of the valve rod and is positioned in the valve cavity, the valve core divides the valve cavity into a rod cavity and a rodless cavity communicated with the outlet, and a through hole for communicating the rod cavity with the rodless cavity is formed in the valve core;

the valve seat is packaged in the valve cavity and positioned through the outer shell, and an adjusting window for communicating the inlet with the outlet is arranged on the valve seat; the valve seat is nested on the valve core, and the valve core can move in the valve seat along the axial direction to completely close, partially open or completely open the adjusting window.

Optionally, the power assembly comprises a motor, a speed reducer, a position sensor, a heating wire and an output shaft; the output shaft passes through the axle sleeve with the hole laminating that the valve rod top was seted up, just the output shaft pass through flaring round pin with the valve rod is connected fixedly.

Optionally, the power assembly is connected with the outer shell through a screw, and a heat insulation pad is arranged at a position where the power assembly is connected with the outer shell.

Optionally, the outer housing includes a valve body and an end cover, and the valve body and the end cover are connected by a screw;

the end cover is connected with the outer shell through screws, the valve rod port is located on the end cover, and the inlet and the outlet are located on the valve body.

Optionally, a sealing ring is arranged between the valve rod and the valve rod port, and a pressing plate for pressing the sealing ring is arranged on the end cover.

Optionally, the end cap is provided with a drainage hole for installing the filler neck, and the drainage hole is communicated with the valve rod port.

Optionally, the valve seat is a revolving body and is composed of an upper end and a lower end with different diameters, the valve seat is integrally in a sleeve structure, and a central through hole of the sleeve is used for placing the valve core; the upper end passes through the valve body with the end cover presss from both sides tight location, the lower extreme with the hole of valve body cooperatees.

Optionally, a positioning step for assisting in positioning the valve element is arranged at the bottom of the central through hole of the sleeve.

Optionally, more than 2 adjusting windows are uniformly distributed on the cylindrical surface at the lower part of the lower end along the circumferential direction; the adjusting window is a T-shaped opening with a large upper part and a small lower part.

Optionally, the valve core is a revolving body, and an outer cylindrical surface is matched with the central through hole of the sleeve; the middle of the valve core is provided with a circular platform, the center of the circular platform is provided with a threaded hole for installing the valve rod, and more than 2 through holes are uniformly distributed on the circular platform along the circumferential direction; and holes are formed in the two ends of the valve core along the axial direction, and the two holes are respectively communicated with the rod cavity and the rodless cavity.

According to the above technical scheme, the utility model provides a squirrel-cage flow control valve with adjustment window includes shell body, power component, valve rod, case and disk seat, by setting up in the outer power component drive valve rod of shell body along axial displacement, provides the valve and opens, flow control, the drive power who ends, and power component drives case linear motion, and the accuracy is high. The power assembly drives the valve core to move through the valve rod, the valve seat is used for guiding the movement of the valve core, the valve core moves in the valve seat along the axial direction, the displacement of the valve core determines the opening degree of a valve seat window, and fluid medium flows from the inlet to the outlet through the valve seat adjusting window. When the valve is closed, the lower end face of the valve core is attached and sealed with the valve seat, when the valve is adjusted, the lower end face of the valve core is separated from the lower end face of the valve seat, and the valve core is controlled to move to change the throttling area of an adjusting window of the valve seat, so that the flow of a medium is controlled, and the functions of valve stopping, valve opening and flow adjusting are realized.

The utility model provides an among the squirrel-cage flow control valve with adjustment window, be provided with the through-hole that is used for the intercommunication to have pole chamber and no pole chamber on the case, the fluid gets into case top space (has the pole chamber), it is balanced mutually to the axial force of case with the entry fluid, the radial fluid effort of case is also balanced each other, the unbalanced effort that the fluid flow was on the case is little, therefore stability is better, can weaken the medium flow oscillation condition, be favorable to the motion of case smooth and easy, avoid the influence of action jamming and entry pressure fluctuation.

Compared with the prior art, the squirrel-cage flow regulating valve with the regulating window provided by the utility model utilizes the ingenious structural design, balances the force of the fluid acting on the valve core, and can weaken the medium flowing oscillation condition, so that the working stability is better; utilize power component to drive case linear motion, the accuracy is high. The variable-thrust liquid oxygen methane engine can be applied to a variable-thrust liquid oxygen methane engine, and the requirement of flow regulation precision is met.

Drawings

Fig. 1 is a full-section structure diagram of a squirrel-cage flow control valve with a control window in a cut-off state according to an embodiment of the present invention;

FIG. 2 is a full cross-sectional block diagram of the squirrel cage flow control valve with adjustment windows of FIG. 1 in a flow control state;

fig. 3 is a schematic structural diagram of a valve seat in the squirrel cage flow regulating valve with a regulating window of fig. 1.

Description of reference numerals: 10-outer shell, 11-end cover, 12-valve body, 13-inlet, 14-outlet, 15-valve rod port, 16-drainage hole, 17-rod cavity, 18-valve cavity and 19-rodless cavity; 20-a power assembly; 30-a valve stem; 40-valve core, 41-circular platform, 42-through hole, 43-hole; 50-valve seat, 51-adjusting window, 52-big end, 53-small end and 54-positioning step; 60-a heat insulation pad; 70-sealing ring, 71-pressing plate; 80-shaft sleeve, 81-cotter pin.

Detailed Description

In order to make the present application more clearly understood by those skilled in the art to which the present application pertains, the following detailed description of the present application is made with reference to the accompanying drawings by way of specific embodiments.

In the embodiment of the present invention, a squirrel-cage flow control valve with an adjusting window is applied to a liquid oxygen methane variable-thrust engine, and the structure thereof is as shown in fig. 1 and 2, and comprises an outer shell 10, a power assembly 20, a valve rod 30, a valve core 40 and a valve seat 50. Compared with other regulating valve types, the unbalanced acting force of the squirrel-cage regulating valve fluid flowing through the valve core is small, so that the stability is better, and the medium flowing oscillation condition can be weakened. Usually, the valve seat is the guide of the motion of the valve core, the lower end face of the valve core is attached to the valve seat for sealing when the valve is closed, and the lower end face of the valve core is separated from the lower end face of the valve seat when the valve is adjusted.

The structure of the components of the squirrel cage flow control valve with adjustment windows of the present invention is described in detail below with reference to an exemplary embodiment:

the outer shell 10 is the installation base of each component of the squirrel-cage flow regulating valve, and the power assembly 20, the valve rod 30, the valve core 40 and the valve seat 50 are all installed and fixed through the outer shell 10. The outer casing 10 has a hollow valve cavity 18, and the casing of the outer casing 10 is provided with 3 openings communicating the valve cavity 18 with the outside, namely a valve stem port 15 for mounting a valve stem 30, an inlet 13 for fluid inflow, and an outlet 14 for fluid outflow. The outer shell 10 can be of an integrated structure or a split structure, and the outer shell 10 is of the split structure in the embodiment in consideration of convenience in installation and maintenance of the squirrel-cage flow regulating valve.

Referring to fig. 1 and 2, the outer housing 10 includes a valve body 12 and an end cover 11, the valve body 12 and the end cover 11 are connected by screws, the end cover 11 is connected with the outer housing 10 by screws, a valve stem port 15 is located on the end cover 11, and an inlet 13 and an outlet 14 are both located on the valve body 12.

Specifically, the upper end of the end cover 11 is connected with the power assembly 20, and the lower end of the end cover is connected with the valve body 12, and the connection modes are screw connection. The end cover 11 is provided with a valve rod port 15 along the axis to be in clearance fit with the valve rod 30, so that smooth movement of the valve rod 30 is ensured, and fluid leakage is avoided. A drainage hole 16 is formed in the left side of the valve rod port 15 and used for installing a filler neck, and the drainage hole 16 is communicated with the valve rod port 15 to lead out a small amount of leaked fluid medium, so that the working reliability is improved.

The lower end of the valve body 12 is connected with an outlet pipeline through an outlet 14, the right end of the valve body is connected with an inlet pipeline through an inlet 13, and the upper end of the valve body is connected with the end cover 11 in a screw connection mode. The valve seat 50 is arranged in the valve body 12 through an axial opening (the valve cavity 18), after the valve seat 50 is installed in the valve cavity 18, a certain gap is formed between the valve seat 50 and the valve cavity 18 in the circumferential direction, and fluid flows in from the inlet 13 and flows out from the circumferential adjusting window 51 of the valve seat 50, so that the valve seat 50 is prevented from being influenced by fluid unbalanced force.

The power assembly 20 is used for driving the valve rod 30 to move along the axial direction, the power assembly 20 is arranged outside the outer shell 10, and an output shaft of the power assembly 20 is connected with one end of the valve rod 30. The power assembly 20 can adopt any existing assembly outputting linear motion, such as a cylinder, a hydraulic cylinder, a linear motor and the like, and has a specific structure.

In the present embodiment, the power assembly 20 includes a motor, a reducer, a position sensor, a heating wire, and an output shaft. Referring to fig. 1 and 2, the power assembly 20 is connected to the top of the end cover 11 of the outer casing 10 by screws, and in consideration of the ultra-low temperature working condition that liquid oxygen methane becomes inside the engine, in this embodiment, a heat insulation pad 60 is disposed at a connection position of the power assembly 20 and the end cover 11, and the heat insulation pad 60 is installed between the power assembly 20 and the end cover 11, so that the influence of a low-temperature medium on the working environment temperature of the motor can be effectively prevented, and the method is a measure for ensuring the normal operation of the motor. The output shaft is attached to an inner hole formed in the top of the valve rod 30 through a shaft sleeve 80, and the shaft sleeve 7 is an L-shaped revolving body and is installed between the output shaft of the power assembly 20 and the valve rod 30 to insulate heat. The output shaft is connected and fixed with the valve rod 30 through a flaring pin 81, the flaring pin 81 is two sections of cylinders and is inserted into the open holes of the valve rod 30, the shaft sleeve 80 and the output shaft, and the consistency of the movement of the valve rod 30 and the output shaft is ensured.

The connection form of the motor, the speed reducer and the output shaft of the power assembly 20 refers to the prior art, and the utility model discloses do not do the restriction. The position sensor is used for matching with the controller to accurately control the axial telescopic position of the power assembly 20. The heating wire is used for heating the working environment temperature of the motor, and the heating wire is matched with the heat insulation pad 60 to ensure that the working environment temperature of the motor is not lower than minus 30 ℃ and the reliability is higher.

The valve rod 30 is used for transmitting the linear motion of the output shaft of the power assembly 20 to the valve core 40, referring to fig. 1 and 2, the top end of the valve rod 30 is provided with an inner hole for installing a shaft sleeve 80 and connecting with the output shaft of the power assembly 20, the lower end of the valve rod 30 extends into the valve cavity 18 through the valve rod port 15, and the lower end of the valve rod 30 is in threaded connection with the valve core 40 and is locked through a nut. The valve stem 30 is a clearance fit with the valve stem port 15. A sealing ring 70 is arranged between the valve rod 30 and the valve rod opening 15, a pressure plate 71 for pressing the sealing ring 70 is arranged on the end cover 11, and the pressure plate 71 and the O-shaped sealing ring 70 are sealed to prevent fluid leakage.

Referring to fig. 1 and 2, a valve core 40 is installed at a lower end of the valve rod 30 and located in the valve chamber 18, the valve core 40 divides the valve chamber 18 into a rod chamber 17 communicating with the valve rod port 15 and a rodless chamber 19 communicating with the outlet port 14, and a through hole 42 for communicating the rod chamber 17 and the rodless chamber 19 is provided in the valve core 40.

Specifically, the valve core 40 is a revolving body, and the outer cylindrical surface is matched with the central through hole of the valve seat 50; the middle of the valve core 40 is a circular platform 41, the center of the circular platform 41 is provided with a threaded hole for installing the valve rod 30, more than 2 through holes 42 are uniformly distributed on the circular platform 41 along the circumferential direction, and the fluid can enter a space (rod cavity 17) formed by the valve core 40 and the end cover 11 after flowing in from the inlet 13, so that the axial acting force of the fluid on the valve core 40 is balanced. Holes 43 are formed in the two ends of the valve core 40 along the axial direction, the two holes are respectively communicated with the rod cavity 17 and the rodless cavity 19, and in order to ensure that the axial forces applied to the two ends of the valve core 40 are balanced, the two holes 43 are preferably the same in depth.

Referring to fig. 1 and 2, a valve seat 50 is enclosed in the valve chamber 18 and positioned by the outer housing 10, and the valve seat 50 is provided with an adjustment window 51 for communicating the inlet 13 and the outlet 14; the valve seat 50 is nested on the valve core 40, and the valve core 40 is axially movable in the valve seat 50 to completely close, partially open, or completely open the regulation window 51.

Specifically, referring to fig. 3, the valve seat 50 is a solid of revolution, and is composed of an upper end 52 and a lower end 53 with different diameters, the valve seat 50 is integrally in a sleeve structure, and a central through hole in the axial direction of the sleeve is used for placing the valve core 40. The upper end 52 is clamped and positioned by the valve body 12 and the end cover 11, so that the sealing performance is ensured while the positioning requirement is met. The lower end 53 mates with the valve chamber 18 of the valve body 12. The bottom of the sleeve central bore is provided with a positioning step 54 for assisting in positioning the valve spool 40, as shown in fig. 2. More than 2 adjusting windows 51 are uniformly distributed on the lower cylindrical surface of the lower end 53 along the circumferential direction, and the opening of the adjusting windows 51 is adjusted through the displacement of the valve core 40, so that the flow is adjusted.

The fluid flow is adjusted by controlling the valve core to move to change the throttling area of the valve core and the valve seat adjusting window, so that the flow of the medium is controlled. Thus, the shape of the valve seat window has a large impact on characterizing the state of the fluid as it flows through the valve. The traditional window shapes are mostly circular, rectangular, rhombic, latticed and the like, and the processing method is generally to machine and form the window on the wall surface of the valve seat. The flow control valve used in the liquid rocket engine generally requires that the flow characteristic is linear and the thrust adjustment change is uniform. According to the flow regulation requirement of the liquid rocket engine, a fitting profile of a valve seat regulation window is designed, and in the embodiment, the regulation window 51 is a T-shaped opening with a large upper part and a small lower part, as shown in fig. 3. The T-shaped opening realizes linear change of flow and valve core displacement, can better ensure accurate adjustment of the flow, and meets the flow demand of the liquid oxygen methane low-temperature liquid rocket engine in the thrust changing process.

Referring to fig. 1 and 2, when the squirrel-cage flow regulating valve with the regulating window of the embodiment is applied to a liquid oxygen methane variable-thrust engine, the working process is as follows:

as shown in fig. 1, when the valve core 40 is engaged with the positioning step 54 at the lower end of the valve seat 50, the opening of the circumferential adjustment window 51 of the valve seat 50 is 0, and the valve is in a closed state.

As shown in fig. 2, the power assembly 20 is commanded to move linearly in the axial direction and stops after the desired displacement is reached. At this time, the valve core 40 moves upward by a corresponding displacement, and the opening degree of the valve seat 50 is determined. Fluid now flows in from the inlet passage 13 and out through the circumferential window 51 of the valve seat 50. Since the opening of the regulating window 51 is in a T shape, and the throttle area and the opening of the valve seat 50 are in a linear relation, the linear relation between the outlet flow and the valve core displacement is good, which is very effective for controlling the flow regulating precision.

After the valve is opened, the fluid flows in from the inlet passage 13, flows into the space at the lower end of the valve core 40, and then flows into between the valve core 40 and the end cover 11 through the through hole 42 of the middle circular platform 41, at this time, the valve core 40 is equivalently immersed in the fluid medium, and the axial acting force of the fluid on the valve core is balanced. The gap between the mating surfaces of the valve stem 30 and the end cap 11 is sealed by an O-ring to prevent cryogenic fluid from leaking.

Through the embodiment, the utility model has the following beneficial effect or advantage:

1) the utility model provides a squirrel-cage flow control valve with adjustment window utilizes ingenious structural design, and the influence of action jamming and entry pressure fluctuation is avoided to the power of balanced fluid effect on the case. The platform in the middle of the valve core is provided with an axial light hole, fluid enters the space above the valve core and is balanced with the axial force of inlet fluid on the valve core, and the acting force of the radial fluid of the valve core is also balanced, so that the smooth movement of the valve core is facilitated.

2) The utility model provides a squirrel-cage flow control valve with adjustment window through the linear flow demand of the fit line of design disk seat T shape adjustment window to cooperate with the linear motion of case, realize that flow control valve's flow characteristic reaches the linearity of requirement. And calculating the maximum value and the minimum value of the flow regulation range to obtain a linear function relation between the flow and the valve core displacement, and proving that the flow characteristic of the method has good linearity based on a flow test.

3) The utility model provides a squirrel-cage flow control valve with adjustment window sets up the location step in the inside bottom of disk seat, when utilizing case closed condition with the inseparable laminating of disk seat, can play the effect of stop valve simultaneously as flow control valve.

4) The utility model provides a squirrel-cage flow control valve with adjustment window utilizes power component to drive case linear motion, and the accuracy is high. Considering that fluid medium is low temperature liquid oxygen liquid methane, for preventing that motor operational environment temperature is low excessively, set up the heat insulating mattress in power component and end cover contact position on the one hand, on the other hand additionally increases the heater in the power component. The two measures ensure that the temperature of the working environment of the motor is not lower than minus 30 ℃, and the reliability is higher.

5) The utility model provides a squirrel-cage flow control valve with adjustment window, structural design is compact reasonable, is applicable to the low temperature environment to possess the precision height, advantage such as reliability height can obtain fine application in liquid oxygen methane low temperature liquid rocket engine.

While the preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all alterations and modifications as fall within the scope of the application.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present application without departing from the spirit and scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is intended to include such modifications and variations as well.

Claims

1. A squirrel-cage flow control valve with an adjusting window is characterized in that: including shell body, power component, valve rod, case and disk seat, wherein:

2. The squirrel cage flow control valve with adjustment window of claim 1, characterized in that: the power assembly comprises a motor, a speed reducer, a position sensor, a heating wire and an output shaft; the output shaft passes through the axle sleeve with the hole laminating that the valve rod top was seted up, just the output shaft pass through flaring round pin with the valve rod is connected fixedly.

3. The squirrel cage flow control valve with adjustment window of claim 1 or 2, characterized in that: the power assembly is connected with the outer shell through screws, and a heat insulation pad is arranged at the position where the power assembly is connected with the outer shell.

4. The squirrel cage flow control valve with adjustment window of claim 1 or 2, characterized in that: the outer shell comprises a valve body and an end cover, and the valve body is connected with the end cover through a screw;

5. The squirrel cage flow control valve with adjustment window of claim 4, characterized in that: and a sealing ring is arranged between the valve rod and the valve rod port, and a pressing plate used for pressing the sealing ring is arranged on the end cover.

6. The squirrel cage flow control valve with adjustment window of claim 5, characterized in that: the end cover is provided with a drainage hole for installing a filler neck, and the drainage hole is communicated with the valve rod opening.

7. The squirrel cage flow control valve with adjustment window of claim 4, characterized in that: the valve seat is a revolving body and is composed of an upper end and a lower end with different diameters, the whole valve seat is of a sleeve structure, and a central through hole of the sleeve is used for placing the valve core; the upper end passes through the valve body with the end cover presss from both sides tight location, the lower extreme with the hole of valve body cooperatees.

8. The squirrel cage flow control valve with adjustment window of claim 7, characterized in that: and a positioning step for assisting the positioning of the valve core is arranged at the bottom of the central through hole of the sleeve.

9. The squirrel cage flow control valve with adjustment window of claim 7, characterized in that: more than 2 adjusting windows are uniformly distributed on the cylindrical surface at the lower part of the lower end along the circumferential direction; the adjusting window is a T-shaped opening with a large upper part and a small lower part.

10. The squirrel cage flow control valve with the adjustment window of any one of claims 7 to 9, wherein: the valve core is a revolving body, and the outer cylindrical surface is matched with the central through hole of the sleeve; the middle of the valve core is provided with a circular platform, the center of the circular platform is provided with a threaded hole for installing the valve rod, and more than 2 through holes are uniformly distributed on the circular platform along the circumferential direction; and holes are formed in the two ends of the valve core along the axial direction, and the two holes are respectively communicated with the rod cavity and the rodless cavity.