A delivery and management system for micro flow control of a working fluid

Abstract

A kind of conveying and management system for micro flow control of working medium, relate to a kind of liquid working medium conveying management system.Pressure pushing assembly is communicated with the inlet end of conveying assembly by pipeline and conveys gas pressure to it, conveying assembly is sequentially connected and arranged by the inlet end to the outlet end, and large storage tank, small storage tank, discharge valve and filter are sequentially connected and arranged, liquid working medium is stored in large storage tank and small storage tank, the inside end of the outlet of small storage tank is provided with elastic connecting pipe, gravity ball is installed at the end of elastic connecting pipe, adjusting assembly is communicated with the outlet end of conveying assembly by pipeline, adjusting assembly is provided with two parallel branches, and a group of solenoid valves are arranged in the two parallel branches respectively, and each group of solenoid valves is composed of first solenoid valve, second solenoid valve and third solenoid valve with different flow passageway in parallel combination.Pressure driving, working medium conveying, flow regulation multi-functional requirements are met, liquid working medium is conveyed without air trapping, flow can be variable adjusted, without overflow loss, more safe and reliable, energy-efficient.

Description

TECHNICAL FIELD

[0001] The present application relates to a liquid working medium conveying and management system, in particular to a conveying and management system for micro flow control of working medium, belonging to the technical field of fluid control of space vehicles. BACKGROUND

[0002] The conveying and management system is an important part of a space vehicle, which undertakes important functions such as pressure driving, working medium conveying, flow regulation, etc. During the movement of a space vehicle, the tank containing liquid working medium will shake, and the liquid working medium will also shake, resulting in air entrainment during conveying. Air entrainment can cause the running efficiency of the system to decrease and the flow to be unable to be accurately controlled. In addition, micro flow control is also one of the key problems of the conveying and management system. Variable flow accurate regulation is an effective way to improve the running efficiency and save energy.

[0003] At present, the common liquid working medium conveying methods of the conveying and management system are extrusion conveying and pumping. Extrusion conveying is to press the liquid working medium in the tank to the workpiece by a high-pressure gas source. A gas-liquid diaphragm is arranged in the tank to separate the gas and the liquid working medium. The diaphragm is deformed to push the liquid working medium by relying on the extrusion of the high-pressure gas. This form can effectively solve the problem of air entrainment during the conveying of the liquid working medium. However, the diaphragm is easily damaged due to continuous extrusion, and the reliability is poor. There is a risk of diaphragm damage in long-term use. In addition, the space utilization efficiency of the extrusion conveying mode of the diaphragm is also low. Pumping is to pump the liquid working medium in the tank to the workpiece by a pump. Only a pump and a regulating valve are needed to meet the conveying function requirements, and the structure is simple. However, the motor pump has a large volume, and there is a disadvantage of occupying a large space. In addition, the pumping mode also has the disadvantages of difficulty in sucking oil under vacuum, low reliability, large pressure pulsation, overflow loss, low efficiency, etc.

[0004] The working medium flow regulation of the conveying and management system usually adopts two ways of pump control and valve control. The pump control way is realized by adjusting the displacement or rotating speed of the pump, and has the disadvantages of slow response speed and low control precision. The valve control way is to adjust the flow area of the control valve to regulate the working medium flow passing through the control valve, and there are several forms such as servo valve, proportional valve, PWM control high-speed on-off valve, etc. Among them, the servo valve has fast response speed and high precision, but has large leakage loss, and is not suitable for the working condition of very small conveying flow. The proportional valve has slower response speed and lower precision, but usually has a large flow diameter. The PWM control high-speed on-off valve has high reliability, but has low control precision. If the control strategy is not properly selected, the high-speed on-off valve will produce large pulsation and impact.

[0005] Therefore, there is an urgent need for a conveying and management system for micro flow control of working medium to meet the multifunctional requirements of pressure driving, working medium conveying, flow regulation, realize reliable and air-entrainment-free conveying of liquid working medium, and variable regulation of micro flow. SUMMARY

[0006] To solve the problems in the background art, the present application provides a delivery and management system for micro flow control of working medium, which meets the multifunctional requirements of pressure pushing, working medium delivery and flow regulation, realizes air-free delivery of liquid working medium, variable regulation of flow, no overflow loss, and is more safe and reliable and energy-efficient.

[0007] To achieve the above-mentioned object, the present application adopts the following technical scheme: a delivery and management system for micro flow control of working medium, comprising a pressure pushing assembly, a delivery assembly and a regulating assembly, the pressure pushing assembly is communicated with the inlet end of the delivery assembly through a pipeline to deliver gas pressure thereto, the delivery assembly is sequentially connected and arranged by a large storage tank, a small storage tank, a relief valve and a filter from the inlet end to the outlet end, the large storage tank and the small storage tank store liquid working medium, the small storage tank outlet inner end is provided with an elastic connecting pipe, the elastic connecting pipe is provided with a gravity ball at the end thereof, the regulating assembly is communicated with the outlet end of the delivery assembly through a pipeline, the regulating assembly is provided with two parallel branches, each of the two parallel branches is provided with a group of electromagnetic valves, and the two groups of electromagnetic valves are the same, each group of electromagnetic valves is composed of a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve with different flow paths in parallel.

[0008] Compared with the prior art, the present application has the following advantages:

[0009] 1. The present application meets the multifunctional requirements of pressure pushing, working medium delivery and flow regulation, the pressure pushing mode is clean and pollution-free, the working medium delivery mode is more reliable and effective, and the flow regulation mode is more energy-efficient and high-efficiency;

[0010] 2. The present application adopts the form of connecting the small storage tank outlet with the elastic connecting pipe provided with a gravity ball in the small storage tank, under the action of inertial force, the gravity ball ensures that the inlet end of the elastic connecting pipe is always immersed in the liquid working medium, which can ensure that the liquid working medium is always delivered from the small storage tank outlet during the delivery process, realizes air-free delivery of liquid working medium, is more safe and reliable compared with the traditional diaphragm extrusion delivery, and avoids the risk of diaphragm damage;

[0011] 3. The regulating assembly of the present application adopts a micro flow digital regulation mode of electromagnetic valve group, two groups of electromagnetic valves are composed of electromagnetic valves with different flow paths in parallel, the flow combination is superimposed through digital control to realize variable regulation of micro flow of liquid working medium, and the present application is more simple and effective when used in cooperation with the pressure pushing assembly, has no overflow loss of liquid working medium, and is more efficient. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 is the principle diagram of the delivery and management system for micro flow control of working medium of the present application;

[0013] Figure 2 is the internal structure diagram of the small tank of the application;

[0014] Figure 3 is the structure diagram of the regulating assembly of the application. DETAILED DESCRIPTION

[0015] The technical solutions in the application will be clearly and completely described below with the accompanying drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments of the application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the application.

[0016] As shown in Figures 1-3 , a delivery and management system for micro flow control of working medium includes a pressure pushing assembly 1, a delivery assembly 2 and a regulating assembly 3. The pressure pushing assembly 1 provides pressure driving as a power source. The delivery assembly 2 realizes non-air-entrapped delivery of liquid working medium. The regulating assembly 3 performs micro flow accurate control of liquid working medium.

[0017] As shown in Figure 1 , the pressure pushing assembly 1 is communicated with the inlet end of the delivery assembly 2 through a pipeline to deliver gas pressure to the delivery assembly 2;

[0018] As shown in Figure 1 , Figure 2 , the delivery assembly 2 is sequentially connected with a large tank 2-1, a small tank 2-2, a relief valve 2-3 and a filter 2-4 from the inlet end to the outlet end. The large tank 2-1 and the small tank 2-2 store liquid working medium.

[0019] The small tank 2-2 is provided with a small tank inlet 2-2.1 and a small tank outlet 2-2.4. The small tank 2-2 contains high-pressure compressed air 2-2.2 and liquid working medium. The high-pressure compressed air 2-2.2 is provided by the pressure pushing assembly 1 through the large tank 2-1 and the small tank inlet 2-2.1. The inside end of the small tank outlet 2-2.4 is provided with an elastic connecting pipe 2-2.3. The end of the elastic connecting pipe 2-2.3 is installed with a gravity ball 2-2.5. During the movement of a spacecraft, the liquid working medium in the small tank 2-2 will shake. Under the action of inertial force, the gravity ball 2-2.5 can rotate 360 degrees but is always immersed in the liquid working medium, so that the inlet at the end of the elastic connecting pipe 2-2.3 is also always immersed in the liquid working medium. During the delivery process, it can be ensured that the liquid working medium is always delivered from the small tank outlet 2-2.4, avoiding the high-pressure compressed air 2-2.2 flowing out with the liquid working medium, effectively avoiding the problem of air entrapping;

[0020] As shown in Figure 1 ,Figure 3 As shown, the adjusting assembly 3 is communicated with the outlet end of the conveying assembly 2 through a pipeline, the adjusting assembly 3 is provided with two parallel branches, each of the two parallel branches is provided with a group of electromagnetic valve groups 3-1, and the two groups of electromagnetic valve groups 3-1 are the same, each group of electromagnetic valve groups 3-1 is composed of a first electromagnetic valve 3-1.1, a second electromagnetic valve 3-1.2 and a third electromagnetic valve 3-1.3 in parallel with different flow passages, the parallel combination form is simple and effective for adjusting the flow, and is high in reliability, the opening and closing combination logic of the first electromagnetic valve 3-1.1, the second electromagnetic valve 3-1.2 and the third electromagnetic valve 3-1.3 with different flow passages is controlled by a digital control mode such as a PLC or a single-chip microcomputer, the flow combination is superimposed to realize the gear adjustment of the small flow of the liquid working medium, and further, in order to avoid the instantaneous flow overshoot caused by the switching between different electromagnetic valves, it is appropriate to adopt a proper time delay control strategy.

[0021] The working principle is as follows: the pressure pushing assembly 1 serves as a power source to deliver gas pressure to the large storage tank 2-1, and then extrude and push the liquid working medium to the small storage tank 2-2 through the small storage tank inlet 2-2.1, because the small storage tank 2-2 is internally connected with the elastic connecting pipe 2-2.3 by the gravity ball 2-2.5 and then connected with the small storage tank outlet 2-2.4, during the movement of the spacecraft, even if the liquid working medium in the small storage tank 2-2 shakes, the gravity ball 2-2.5 can rotate 360 degrees under the action of the inertial force but is always immersed in the liquid working medium, so the inlet at the end of the elastic connecting pipe 2-2.3 is also always immersed in the liquid working medium, it is ensured that the liquid working medium is always delivered from the small storage tank outlet 2-2.4, the delivery of the high-pressure compressed air 2-2.2 with the liquid working medium is avoided, air-free delivery is realized, then the liquid working medium flows through the filter 2-4 and is finally delivered to the adjusting assembly 3, flows through the two groups of electromagnetic valve groups 3-1, the two groups of electromagnetic valve groups 3-1 are composed of the first electromagnetic valve 3-1.1, the second electromagnetic valve 3-1.2 and the third electromagnetic valve 3-1.3 in parallel with different flow passages, the opening and closing combination logic of the two groups of electromagnetic valve groups 3-1 is controlled by a digital control mode, the flow combination is superimposed to realize the gear adjustment of the small flow of the liquid working medium, and the liquid working medium is quantitatively delivered to the application workpiece.

[0022] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, the scope of the present application is defined by the appended claims rather than the above description, and all changes falling within the meaning and scope of the equivalent conditions of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

[0023] Furthermore, it should be understood that although the specification is described in terms of embodiments, not every embodiment includes every feature described. The specification can include implicit combinations of explicitly mentioned features and / or explicit combinations of implicitely mentioned features. Each embodiment depends on the explicit combinations of features and / or the implicit combinations of features made specifically within that embodiment, and each such embodiment can be combined with every other such embodiment to create further embodiments.

Claims

1. A conveying and management system for controlling the minute flow rate of a working fluid, characterized in that: The system includes a pressure pushing component (1), a conveying component (2), and a regulating component (3). The pressure pushing component (1) is connected to the inlet end of the conveying component (2) via a pipeline to deliver air pressure to it. The conveying component (2) is sequentially connected from the inlet end to the outlet end to a large storage tank (2-1), a small storage tank (2-2), a pressure relief valve (2-3), and a filter (2-4). The large storage tank (2-1) and the small storage tank (2-2) contain liquid working fluid. An elastic connecting pipe (2-2.3) is installed on the inner end of the outlet (2-2.4) of the small storage tank. A gravity ball (2-2.5) is installed at the end of the elastic connecting pipe (2-2.3). The force ball (2-2.5) can rotate 360 ​​degrees under the action of inertial force but is always immersed in the liquid working medium to ensure that the liquid working medium is always delivered from the outlet (2-2.4) of the small storage tank. The regulating component (3) is connected to the outlet end of the conveying component (2) through the pipeline. The regulating component (3) is provided with two parallel branches. Each of the two parallel branches is provided with a set of solenoid valve groups (3-1), and the two sets of solenoid valve groups (3-1) are the same. Each set of solenoid valve groups (3-1) is composed of three solenoid valves with different flow diameters: the first solenoid valve (3-1.1), the second solenoid valve (3-1.2), and the third solenoid valve (3-1.3) connected in parallel.

2. The conveying and management system for controlling the minute flow rate of a working fluid according to claim 1, characterized in that: The regulating component (3) controls the switching combination logic of the first solenoid valve (3-1.1), the second solenoid valve (3-1.2) and the third solenoid valve (3-1.3) with different flow diameters through digital control, and superimposes the flow combination to realize the variable adjustment of the liquid working fluid flow rate.

3. A conveying and management system for controlling the minute flow rate of a working fluid according to claim 2, characterized in that: The digital control of the adjustment component (3) adopts a time delay control strategy.

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