CN213478522U - Adjustable cavitation venturi - Google Patents
Adjustable cavitation venturi Download PDFInfo
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- CN213478522U CN213478522U CN202022037398.XU CN202022037398U CN213478522U CN 213478522 U CN213478522 U CN 213478522U CN 202022037398 U CN202022037398 U CN 202022037398U CN 213478522 U CN213478522 U CN 213478522U
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Abstract
The utility model relates to an adjustable cavitation venturi tube, the fixed end of its driving motor is fixed and set up on first valve body, the output shaft of driving motor can be along the axial of first valve body and do concertina movement, first valve body is installed on the first end of second valve body, be provided with the through-hole in the second valve body, the through-hole is link up along the axial of second valve body and is set up, be provided with the entry on the global of second valve body, the first section of valve rod and the output shaft of driving motor, the second section of valve rod is cylindric, the second section clearance fit ground of valve rod runs through the through-hole, the third section of valve rod is the cone, the diameter of cone from the second section to the direction of third section reduces gradually, the third valve body is installed on the second end of second valve body, the venturi tube has been seted up in the third valve body, entry and venturi tube communicate, the shrink section of venturi tube leans on to the second valve body, the throat of venturi tube, the second and third sections of the valve stem may be inserted into the venturi. The utility model discloses can realize fluid flow's size.
Description
Technical Field
The utility model belongs to the technical field of the aviation power, especially, relate to an adjustable cavitation venturi tube.
Background
The variable thrust rocket engine can provide controllable power for the propulsion and control of the spacecraft, increases the adaptability and operability of the spacecraft on flight tasks and orbits, and is an ideal choice for a power system of a space vehicle. With the increasing year by year of human exploration of space activities, the importance of developing thrust-variable propulsion technology is becoming more practical and new. The main method for changing the thrust of the rocket engine is to adjust the flow of the propellant, and the adjustment and control precision of the flow of the propellant directly influences the performance of the rocket engine.
The adjustable cavitation venturi tube is an important flow adjusting element, has excellent adjusting performance and is widely used in a reusable variable thrust rocket engine.
In the prior art, the adjustable cavitation venturi is driven by an electro-hydraulic control mechanism, the structure is complex, and the precision is not high, so the prior art needs to be improved.
SUMMERY OF THE UTILITY MODEL
Not enough to above-mentioned prior art exists, the utility model provides a bearing structure of rolling mill AGC jar piston to solve among the prior art AGC jar and put the sensor deviation that causes down, influence rolling precision, cause the technical problem that spare part restoration maintenance cost increased simultaneously.
The technical scheme of the utility model is that:
an adjustable cavitation venturi, comprising:
a first valve body;
the fixed end of the driving motor is fixedly arranged on the first valve body, and an output shaft of the driving motor can do telescopic motion along the axial direction of the first valve body;
the valve comprises a first valve body, a second valve body and a valve body, wherein the first valve body is provided with a first end and a second end which are opposite to each other;
the valve rod is sequentially provided with a first section, a second section and a third section along the axial direction, the first section of the valve rod is connected with an output shaft of the driving motor, the second section of the valve rod is cylindrical, the second section of the valve rod penetrates through the through hole in a clearance fit manner, the third section of the valve rod is a cone, and the diameter of the cone is gradually reduced from the second section to the third section;
the third valve body is arranged at the second end of the second valve body, a venturi is arranged in the third valve body, the inlet is communicated with the venturi, the venturi is provided with a contraction section, a throat part and an expansion section, the contraction section of the venturi is close to the second valve body, the throat part of the venturi is matched with the diameter of the second section of the valve rod, and the second section and the third section of the valve rod can be inserted into the venturi.
Further, the throat of the venturi is cylindrical.
Further, a cavity is arranged in the first valve body, one end of the cavity, facing the second valve body, is open, the side wall of the cavity is connected to the first end of the second valve body, and the driving motor is fixedly arranged in the cavity.
Still further, the valve further comprises a heating assembly for heating the first valve body;
a thermal insulation pad is disposed between the sidewall of the cavity and the first end of the second valve body.
Preferably, the material of the heat insulation pad is polyimide.
Further, the end of the first segment of the valve stem is provided with a groove into which the output shaft of the driving motor is detachably inserted.
Furthermore, a heat insulation sleeve is sleeved on the output shaft of the driving motor.
Preferably, the material of the heat insulation sleeve is polyimide.
Further, a mounting hole is formed in the second end of the second valve body;
the third valve body is inserted into the mounting hole with an interference fit.
Furthermore, a limiting ring is arranged on the circumferential surface of the third valve body, and the limiting ring is tightly attached to the second end of the third valve body.
The utility model has the advantages that:
when the flow of the input fluid is adjusted through the adjustable cavitation venturi provided by the utility model, the fluid flows into the venturi from the inlet of the second valve body for input, and the valve rod is driven to move in the venturi by controlling the extension and contraction of the output shaft of the driving motor, when the valve rod is in an initial state, at the moment, the valve rod does not enter the venturi, the fluid flow is maximum, because the third section of the valve rod is a cone, the diameter of the cone is gradually reduced from the second section to the third section, when the third section of the valve rod moves to the throat of the venturi, the gap between the third section of the valve rod and the throat of the venturi is changed, so that the flow can be controlled, since the throat of the venturi is matched to the diameter of the second section of the valve stem, no fluid is discharged from the venturi and the fluid flow is minimized.
To sum up, the utility model provides an adjustable cavitation venturi tube can realize fluid flow's size through the removal of driving motor control valve rod, simple structure, and the precision is high, has fine practicality.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an adjustable cavitation venturi according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Fig. 1 is a schematic structural diagram of an adjustable cavitation venturi according to an embodiment of the present invention, and with reference to fig. 1, the adjustable cavitation venturi includes a first valve body 1, a driving motor 8, a second valve body 3, a valve rod 6, and a third valve body 7.
With reference to fig. 1, in the embodiment of the present invention, the fixing end of the driving motor 8 is fixed on the first valve body 1, and the output shaft of the driving motor 8 can move in a telescopic manner along the axial direction of the first valve body 1.
With reference to fig. 1, the second valve body 3 of the embodiment of the present invention has a first end and a second end opposite to each other, the first valve body 1 is installed on the first end of the second valve body 3, a through hole is provided in the second valve body 3, the through hole is arranged along the axial direction of the second valve body 3, an inlet 9 is provided on the circumferential surface of the second valve body 3, and the fluid can flow into the second valve body 3 from the inlet 9.
Referring to fig. 1, in this embodiment, the valve rod 6 is sequentially provided with a first section, a second section and a third section along the axial direction thereof, and the first section of the valve rod 6 is connected with the output shaft of the driving motor 8, that is, the valve rod 6 can be driven to move under the driving of the driving motor 8. The embodiment of the utility model provides an in, the second section of valve rod 6 is cylindric, and the second section clearance fit ground of valve rod 6 runs through the through-hole, can be provided with the sealing washer between the second section of valve rod 6 and the through-hole, when valve rod 6 removed in the through-hole, can prevent to flow into the fluid from the entry 9 and flow into first valve body 1, and the third section of valve rod 6 is the cone, and the diameter of cone follow second section to the direction of third section reduces gradually.
The utility model discloses third valve body 7 installs on the second of second valve body 3 is served, venturi 10 has been seted up in third valve body 7, above-mentioned entry 9 and venturi 10 communicate with each other, thereby can discharge the fluid that flows into in the second valve body 3 from entry 9 through venturi 10, venturi 10 has the contraction section, throat and expansion section, venturi 10's contraction section is by the diameter phase-match to second valve body 3, venturi 10's throat and valve rod 6's second section, venturi 10 can be inserted to second section and the third section of valve rod 6.
When the adjustable cavitation venturi provided by the embodiment of the present invention adjusts the input fluid flow, the fluid flows into the venturi 10 from the inlet 9 of the second valve body 3 and is input, the valve rod 6 is driven to move in the venturi 10 by controlling the extension and contraction of the output shaft of the driving motor 1, when the valve rod 6 is in the initial state, the valve rod 6 does not enter the venturi 10, the fluid flow is maximum, because the third section of the valve rod 10 is a cone, the diameter of the cone is gradually reduced from the second section to the third section, when the third section of the valve rod 10 moves at the throat of the venturi 10, the gap between the third section of the valve rod 6 and the throat of the venturi 10 is changed, thereby the flow can be controlled, when the second section of the valve rod 6 moves to the throat of the venturi 10, because the throat of the venturi 10 is matched with the diameter of the second section of the valve rod 6, at this point, no fluid is discharged from the venturi 10 and the fluid flow is minimal.
With reference to fig. 1, in the embodiment of the present invention, a cavity is disposed in the first valve body 1, the cavity is open towards one end of the second valve body 3, and the sidewall of the cavity is connected to the first end of the second valve body 3, so as to realize the installation of the first valve body 1 on one end of the second valve body 3, and the driving motor 8 is disposed in the cavity.
Specifically, in the embodiment of the present invention, the side wall of the cavity may be connected to the first end of the second valve body 3 by means of bolts.
The utility model discloses adjustable cavitation venturi tube still can include the heating element to the heating of first valve body 1, because the rocket engine is in work under the extremely cold operating mode, sets up heating element and can heat first valve body 1, avoids low temperature medium to influence driving motor 8's operational environment temperature, can effectively improve the reliability of motor work.
The embodiment of the utility model provides a heating element can be electric heating wire or electric heating plate, the embodiment of the utility model provides a do not limit to this.
Further, referring to fig. 1, in the present embodiment, a thermal insulation pad 2 is disposed between a side wall of the cavity and the first end of the second valve body 3, so as to prevent the heated first valve body 1 from transferring heat to the second valve body 3, which affects the working temperature of the fluid.
The working environment temperature of the driving mechanism 1 is prevented from being influenced by low-temperature media, and the working reliability of the motor can be effectively improved.
In this embodiment, the material of the heat insulating pad 2 may be polyimide.
Referring to fig. 1, in the embodiment of the present invention, the end of the first section of the valve rod 6 is provided with a groove 11, and the output shaft of the driving motor 8 is detachably inserted into the groove 11.
Further, the output shaft of the driving motor 8 can be connected to the groove 11 through the flaring pin 4, and the heat insulation sleeve 5 is sleeved on the output shaft of the driving motor 8, so that the valve body 6 can be prevented from being heated, and the heat insulation sleeve 5 can be prevented from being rubbed and scratched.
Similarly, the material of the heat insulation sleeve 5 of the embodiment of the present invention can also be polyimide.
The embodiment of the utility model provides an in, can be provided with the sealing washer on the second section of valve rod 6 to prevent that the fluid from leaking to the cavity in the first valve body 1 between the second section of valve rod 6 and the through-hole in the second valve body 3.
The embodiment of the utility model provides an in, the tip of the third section of valve rod 6 is the arc, can prevent that the tip of the third section of valve rod 6 from damaging when assembling.
In the embodiment of the present invention, the throat of the venturi 10 is cylindrical, which can help the fluid pressure recovery and flow stability.
The embodiment of the utility model provides an in, be provided with the mounting hole on the second end of the second valve body 3, insert the mounting hole in the third valve body 7 interference fit to realize the assembly of third valve body 7 on the second valve body 3.
Referring to fig. 1, in the embodiment of the present invention, a limiting ring 12 is disposed on the circumferential surface of the third valve body 7, and the limiting ring 12 is disposed closely to the second end of the second valve body 3, so as to improve the reliability of the assembly of the third valve body 7 on the second valve body 3.
Further, with reference to fig. 1, in the embodiment of the present invention, the third valve body 3 may be integrally formed with the stop ring 12, and the stop ring may be bolted to the second end of the second valve body 3, so as to further improve the reliability of the assembly of the third valve body 7 on the second valve body 3.
The utility model discloses adjustable cavitation venturi tube's working process does:
the fluid flows in from the inlet 9 of the second valve body 3, enters the contraction section to be accelerated after reaching the venturi 10, and the static pressure is reduced due to the increase of the fluid speed as known from the Bernoulli principle. Cavitation occurs in the pipe when the static pressure drops below the local temperature saturation vapor pressure, where the flow is only affected by the inlet pressure, throat diameter and saturation vapor pressure of the medium, and not by the downstream outlet pressure. Based on the principle, the flow can be controlled by adjusting the throat flow area. After passing through the throat part, the fluid firstly passes through a small segment of straight line segment, so that the cavitation is ensured to be more sufficient, and the stability of the flow is improved. Finally, the static pressure is increased through the deceleration of the expansion section, and the evaporated fluid is condensed again and flows out from the outlet pipeline after being more than the saturated vapor pressure.
This embodiment provides power through driving motor to drive valve rod 6 and remove, accessible control center sends the instruction to driving motor, and control valve rod 6 displacement is certain distance, and valve rod 6 stretches into the third section of throat for coniform, and the displacement can lead to valve rod 6 to be located the change of the cross-sectional area of throat, and the clearance area of valve rod 6 and throat changes correspondingly, and this has just realized the control to throat flow area.
To sum up, the utility model provides an adjustable cavitation venturi tube can realize fluid flow's size through the removal of driving motor control valve rod, simple structure, and the precision is high, has fine practicality.
The following embodiments are preferred embodiments of the present invention, which are not intended to limit the present invention in any form, and any technical field has a general knowledge, if the present invention does not depart from the technical features of the present invention, the present invention utilizes the technical features of the present invention to make local changes or modifications, and does not depart from the technical features of the present invention, and all the technical features of the present invention still belong to the scope of the present invention.
Claims (10)
1. An adjustable cavitation venturi, comprising:
a first valve body;
the fixed end of the driving motor is fixedly arranged on the first valve body, and an output shaft of the driving motor can do telescopic motion along the axial direction of the first valve body;
the valve comprises a first valve body, a second valve body and a valve body, wherein the first valve body is provided with a first end and a second end which are opposite to each other;
the valve rod is sequentially provided with a first section, a second section and a third section along the axial direction, the first section of the valve rod is connected with an output shaft of the driving motor, the second section of the valve rod is cylindrical, the second section of the valve rod penetrates through the through hole in a clearance fit manner, the third section of the valve rod is a cone, and the diameter of the cone is gradually reduced from the second section to the third section;
the third valve body is arranged at the second end of the second valve body, a venturi is arranged in the third valve body, the inlet is communicated with the venturi, the venturi is provided with a contraction section, a throat part and an expansion section, the contraction section of the venturi is close to the second valve body, the throat part of the venturi is matched with the diameter of the second section of the valve rod, and the second section and the third section of the valve rod can be inserted into the venturi.
2. The adjustable cavitation venturi of claim 1, wherein the throat of the venturi is cylindrical.
3. The adjustable cavitation venturi according to claim 1, wherein a cavity is provided in the first body, an end of the cavity facing the second body is open, a side wall of the cavity is connected to the first end of the second body, and the driving motor is fixedly disposed in the cavity.
4. The adjustable cavitation venturi of claim 3, further comprising a heating assembly that heats the first valve body;
a thermal insulation pad is disposed between the sidewall of the cavity and the first end of the second valve body.
5. The adjustable cavitation venturi of claim 4, wherein the material of the thermal insulation pad is polyimide.
6. The adjustable cavitation venturi according to claim 3, wherein an end of the first section of the valve stem is provided with a recess into which an output shaft of the drive motor is detachably inserted.
7. The adjustable cavitation venturi of claim 5, wherein the output shaft of the drive motor is sleeved with a heat insulating sleeve.
8. The adjustable cavitation venturi of claim 7, wherein the thermal sleeve is polyimide.
9. The adjustable cavitation venturi according to any one of claims 1 to 8, wherein the second end of the second valve body is provided with a mounting hole;
the third valve body is inserted into the mounting hole with an interference fit.
10. The adjustable cavitation venturi of claim 9, wherein a stop ring is disposed on a circumferential surface of the third body, the stop ring being disposed proximate the second end of the third body.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022037398.XU CN213478522U (en) | 2020-09-17 | 2020-09-17 | Adjustable cavitation venturi |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022037398.XU CN213478522U (en) | 2020-09-17 | 2020-09-17 | Adjustable cavitation venturi |
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| Publication Number | Publication Date |
|---|---|
| CN213478522U true CN213478522U (en) | 2021-06-18 |
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| CN202022037398.XU Active CN213478522U (en) | 2020-09-17 | 2020-09-17 | Adjustable cavitation venturi |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211751A (en) * | 2020-09-17 | 2021-01-12 | 航天科工火箭技术有限公司 | Adjustable cavitation venturi |
| NL2029588B1 (en) | 2021-11-02 | 2023-06-01 | Magnets For Emulsions N V | Flow control device and mixing assembly comprising said flow control device |
-
2020
- 2020-09-17 CN CN202022037398.XU patent/CN213478522U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112211751A (en) * | 2020-09-17 | 2021-01-12 | 航天科工火箭技术有限公司 | Adjustable cavitation venturi |
| NL2029588B1 (en) | 2021-11-02 | 2023-06-01 | Magnets For Emulsions N V | Flow control device and mixing assembly comprising said flow control device |
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