Light and small integrated pump valve assembly

Abstract

The light and small integrated pump valve assembly comprises a space micropump main part, a space micropump backup part, a one-way valve main part, a one-way valve backup part, an assembly outlet, a filter, an assembly inlet, a compensator, a gas adding and discharging valve, an outlet pressure sensor, an inlet pressure sensor and a bottom plate. According to the pump valve assembly, the mechanical pump, the compensator, the filter, the one-way valve, the pressure sensor and the gas adding and discharging valve component are compactly integrated, the mechanical pump in the pump valve assembly can drive a working medium to flow, the mechanical pump has a main pump and a backup pump, a loop channel is automatically switched when the main pump and the backup pump are switched, and an internal loop or short circuit is not formed; the compensator can absorb and compensate a loop working medium, and the pump valve assembly can achieve thermal control of a satellite thermal load of 500W (long term) and can achieve thermal control of 1.5 KW (1-4 hours) in a short time. The integrated pump valve assembly can be widely applied to active thermal control systems of high-power loads, deep space exploration spacecrafts and the like.

Description

Technical Field

[0001] The invention relates to a light and small integrated pump valve assembly, belonging to the technical field of aerospace propulsion. Background Art

[0002] With the increase in power consumption of spacecraft payloads, high heat flux density can no longer be controlled passively. Active thermal control systems using pump-driven fluid loops have gradually become an important method in the field of thermal control of spacecraft. They have excellent heat exchange capacity, high reliability, and adjustable heat exchange power. Currently, manned spacecraft, deep space exploration, and lunar exploration projects all use single-phase fluid loops.

[0003] At present, China is developing active thermal control fluid circuits for high-power payloads (cameras, radars, etc.) and large communication satellites. As the key core components of thermal control fluid circuits, pump and valve assemblies have become a hot product for research at home and abroad. In order to meet the needs of spacecraft, pump and valve assemblies must have the characteristics of light weight, compact structure, low power, high reliability and long life. At present, the fluid circuit technology of light and small integrated pump and valve assemblies is developing rapidly, and has become one of the bottlenecks that seriously restrict the development of thermal control technology of spacecraft in my country. Summary of the invention

[0004] The technical problem solved by the present invention is to overcome the deficiencies of the prior art and provide a light and small integrated pump valve assembly to achieve compact integration and lightweight design.

[0005] The technical solution of the present invention is: a light and small integrated pump and valve assembly, including a base plate and a main part of a space micro pump, a backup of a space micro pump, a main part of a one-way valve, a backup of a one-way valve, an assembly outlet, a filter, an assembly inlet, a compensator, an air addition and exhaust valve, an outlet pressure sensor, an inlet pressure sensor, and a base plate installed on the base plate;

[0006] A main one-way valve and a backup one-way valve are installed downstream of the main space micropump and the backup one-way valve respectively, and then connected in parallel through pipelines. The main one-way valve, the backup one-way valve, the main space micropump, and the backup space micropump adopt a two-layer layout, and an inlet pressure sensor and an outlet pressure sensor are installed at both ends of the two connections respectively. The inlet pipeline is connected to the filter and the compensator, and the component inlet is connected to the filter. The air addition and exhaust valve is installed on the compensator, and the medium is filled into the fluid circuit from the component inlet. When on track, one of the main space micropump and the backup space micropump works, the downstream one-way valve is opened, and the flow rate is increased to the rated flow rate under the speed condition, so as to realize the circulation of liquid medium inside the fluid circuit, and the compensator realizes the recovery and replenishment of the medium inside the fluid circuit caused by temperature changes. The fluid circuit is a pipeline through which the medium flows between the component inlet and the component outlet.

[0007] Preferably, the main space micropump and the backup space micropump are both single-stage centrifugal pumps and brushless permanent magnet motors packaged as an integral structure, the stator and rotor of the brushless permanent magnet motor are separated by a shielding sleeve, and the conveying medium is used to achieve bearing self-lubrication and motor thermal balance control.

[0008] Preferably, the main spatial micropump and the backup spatial micropump change the flow rate of the fluid circuit by speed regulation, use the heat exchange requirements of different heat loads, and achieve speed regulation by changing the duty cycle through a digital circuit.

[0009] Preferably, the main one-way valve and the backup one-way valve utilize a diaphragm structure, which satisfies that when the working fluid is perfluorotriethylamine, when the rated flow rate is 70L / h, the external output pressure head is not less than 0.060MPa, and the power consumption does not exceed 10W, and it works normally when the inlet pressure is ≮70kPa.

[0010] Preferably, the main one-way valve and the backup one-way valve are closed in a static state, with a rated flow rate of 70L / h, a working flow range of 50L / h to 70L / h, can be opened in place, the opening pressure does not exceed 10kPa, and the flow resistance at the rated operating point is not higher than 10kPa.

[0011] Preferably, the compensator adopts a rubber bag diaphragm storage tank structure, and the maximum storage capacity of the medium in the compensator is the same as the maximum expandable volume of the diaphragm. At a low temperature of -25°C, the compensator meets the requirement of an extrusion volume of not less than 70mL; at a high temperature of 65°C, the compensator meets the requirement of an absorption volume of not less than 75mL.

[0012] Preferably, the air adding and discharging valve and the compensator are fixedly connected by welding. During the filling and discharging process of the fluid circuit, the air adding and discharging valve 7 is used to connect the ground inflation equipment and the compensator for inflation and pressurization.

[0013] Preferably, the compensator is filled with a gas medium of nitrogen with a purity higher than 99.99%, and the pressure during medium filling and circuit operation is 0 to 0.35 MPa.

[0014] Preferably, the filter adopts a two-layer titanium alloy mesh structure, the filtering accuracy of the titanium alloy mesh is better than 50 μm, and the filter composed of the two layers of titanium alloy mesh and the component inlet are designed as an integrated structure.

[0015] Preferably, when working on orbit, the main part of the space micropump works, and the speed gradually increases from 0 to the rated speed. When the speed increases and the output pressure exceeds the opening pressure of the main part of the one-way valve, the main part of the one-way valve opens. At this time, the backup part of the space micropump is in a shutdown state, and the backup part of the one-way valve is in a closed state due to the reverse pressure; when the main part of the space micropump is abnormal, the main part of the space micropump is controlled to stop working through external instructions, and the main part of the one-way valve is closed during the speed reduction process, and the backup part of the space micropump starts to work. When the speed increases and the output pressure exceeds the opening pressure of the backup part of the one-way valve, the backup part of the one-way valve opens, thereby realizing the automatic switching of the main and backup liquid circuits.

[0016] Compared with the prior art, the present invention has the following advantages:

[0017] 1) The light and small integrated pump and valve assembly of the present invention adopts a highly integrated design concept, and the two-layer layout realizes the integration of each single machine in a limited space. At the same time, the discharge efficiency and storage efficiency of the pump and valve assembly are higher than those of existing products, effectively reducing the structural space.

[0018] 2) The light and small integrated pump and valve assembly of the present invention adopts a compensator and a diaphragm tank to replace the metal bellows tank commonly used in current thermal control systems, thereby reducing the weight of the compensator by more than 50%. The weight of the entire assembly is only 1.8 kg, which is 40% lower than that of traditional products. The fatigue resistance of the compensator is greatly improved, and the service life of the compensator is extended. The fatigue life can reach more than 5,000 times.

[0019] 3) The light and small integrated pump and valve assembly of the present invention utilizes a diaphragm-type one-way valve in conjunction with a mechanical pump to effectively prevent backflow. Compared with the temperature control valve solution of the original thermal control system, the reliability is improved, and the opening pressure of the one-way valve does not exceed 10kPa, which effectively reduces the head of the space micropump and reduces the power consumption of the mechanical pump.

[0020] 4) The speed adjustment range of the light and small integrated pump and valve assembly of the present invention is 4000-10000rpm, the output pressure range is 0.18-0.11MPa, the speed control accuracy can reach 0.1‰, and the flow rate can be adjusted to accurately control the circulation flow of the fluid circuit.

[0021] 5) The cooperation of the spatial micro pump and the one-way valve of the light and small integrated pump and valve assembly of the present invention realizes the free switching of the main and backup parts of the fluid circuit, and the system reliability is high.

[0022] 6) The light and small integrated pump and valve assembly of the present invention adopts an air adding and discharging valve to provide support for gas replenishment and pressurization of the compensator air cavity. Compared with the existing air cavity welding plugging form, it can realize repeated addition and discharge of gas in the air cavity, improve reliability, and at the same time ensure the sealing state of the liquid cavity and the air cavity.

[0023] 7) The light and small integrated pump-valve assembly of the present invention has the characteristics of adjustable speed, wide heat exchange power range, low power, light weight, small outer envelope, etc., and can be applied to the thermal control fluid circuit system of various types of spacecraft. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 This is a diagram showing an embodiment of a light and small integrated pump and valve assembly of the present invention. DETAILED DESCRIPTION

[0025] The following is a further description with reference to the accompanying drawings and specific embodiments.

[0026] A lightweight integrated pump and valve assembly adopts a highly integrated design concept to achieve lightweight, miniaturized layout and functional integration of components, such as Figure 1 As shown, the main part of the space micro pump 1, the backup part of the space micro pump 2, the main part of the one-way valve 3, the backup part of the one-way valve 4, the component outlet 5, the filter 6, the component inlet 7, the compensator 8, the gas adding and exhausting valve 9, the outlet pressure sensor 10, the inlet pressure sensor 11, and the bottom plate 12;

[0027] The function of the light and small integrated pump and valve assembly is mainly to circulate the liquid medium inside the fluid circuit of the thermal control system, and at the same time compensate for the volume change of the medium caused by temperature change, and the compensator 8 realizes the recovery and replenishment of the medium inside the fluid circuit.

[0028] The compensator 8 will passively adjust the residual amount of the internal medium according to the changes in the temperature and pressure of the medium inside the component, and discharge or replenish the perfluorotriethylamine medium to adapt to the volume change caused by the change in medium density. The compensator 8 adopts a rubber bladder diaphragm tank structure. The maximum expandable volume of the diaphragm is 0.45L, and the maximum storage capacity of the perfluorotriethylamine medium in the compensator is 0.45L. At a low temperature of -25°C, the compensator meets the requirement of an extrusion volume of not less than 70mL. At a high temperature of 65°C, the compensator meets the requirement of an absorption volume of not less than 75mL. The structure of the present invention replaces the metal bellows tank commonly used in current thermal control systems, improves the fatigue resistance of the compensator, and extends the service life of the compensator. At the same time, the discharge efficiency and storage efficiency of the bladder diaphragm tank are higher than those of the metal diaphragm tank, which effectively saves structural space and reduces the weight of the tank. The weight of the rubber diaphragm tank is reduced by 50% compared with the metal bellows tank.

[0029] The main space micro pump 1 and the backup space micro pump 2 are in the form of single-stage shielded centrifugal pumps, the bearings are self-lubricating, and the conveying medium is used to achieve bearing lubrication and motor thermal balance control;

[0030] The main space micropump 1 and the backup space micropump 2 are packaged as an integral structure using a brushless permanent magnet motor. The stator and rotor are separated by a shielding sleeve, which is a leakage-free shielded pump structure and effectively solves the problem of shaft leakage. When the pump-valve assembly is on track, one of the main space micropump 1 and the backup space micropump 2 is working, the downstream one-way valve is opened, and the flow rate is increased to the rated flow rate under the speed condition, thereby realizing the circulation of the liquid medium inside the fluid circuit.

[0031] The main spatial micropump 1 and the backup spatial micropump 2 can change the flow of the fluid circuit system by speed regulation, and use the heat exchange requirements of different heat loads. The speed is regulated by changing the duty cycle through a digital circuit.

[0032] The one-way valve main part 3 and the one-way valve backup 4 utilize a diaphragm structure, and cooperate with the space micropump main part 1 and the space micropump backup 2 to effectively prevent backflow, and the reliability is improved compared with the temperature control valve solution of the original thermal control system.

[0033] The one-way valve main part 3, one-way valve backup 4, space micro pump main part 1, and space micro pump backup 2 adopt a two-layer layout to achieve a reasonable layout in a compact space, while ensuring the feasibility of the welding process;

[0034] The filter 6 adopts a two-layer titanium alloy mesh structure, the filtration accuracy of the titanium alloy mesh is better than 50 μm, and the filter 6 composed of the two layers of titanium alloy mesh and the component inlet 7 are designed as an integrated structure;

[0035] The air adding and discharging valve 9 and the compensator 8 are fixedly connected by welding. During the filling and discharging process of the fluid circuit, the air adding and discharging valve 9 is used to connect the ground inflation equipment and the compensator 8 for inflation and pressurization.

[0036] When the rated flow rate of the main spatial micropump 1 and the backup spatial micropump 2 is 70L / h, the external output pressure head is not less than 0.060MPa (working fluid perfluorotriethylamine), and the power consumption does not exceed 10W.

[0037] The space micropump main part 1 and the space micropump backup 2 work normally when the inlet pressure is ≮20kPa.

[0038] The main one-way valve 3 and the backup one-way valve 4 are closed in a static state, with a rated flow rate of 70L / h, an operating flow range of 50L / h to 70L / h, can be opened in place, the opening pressure does not exceed 10kPa, and the flow resistance at the rated operating point is not higher than 10kPa.

[0039] The gas medium filled in the compensator 8 is high-purity (purity higher than 99.99%) nitrogen, and the pressure during medium filling and circuit operation is 0-0.35MPa;

[0040] The weight of the component does not exceed 1.8 kg, and the outer envelope does not exceed 300 mm × 230 mm × 120 mm.

[0041] The working principle of the present invention is as follows:

[0042] The integrated pump-valve assembly is filled with perfluorotriethylamine medium, and is pressurized by adding high-purity nitrogen through the gas adding and discharging valve 9 installed on the compensator 8 to ensure that no cavitation occurs during the operation of the space micropump main part 1 and the space micropump backup 2. When working on orbit, the space micropump main part 1 works, and the speed gradually increases from 0 to the rated speed of 8000rpm. When the speed increases to 2000rpm, the output pressure exceeds the opening pressure of the one-way valve main part 3, and the one-way valve main part 3 opens. At this time, the space micropump backup 2 is in the shutdown state, and the one-way valve backup 4 is in the closed state under the reverse pressure; after the one-way valve main part 3 is opened, the internal perfluorotriethylamine medium circulates, and the heat exchange pipeline of the fluid circuit is used to achieve thermal control with the entire spacecraft and payload.

[0043] The mechanical pump (main space micropump and backup space micropump) in the pump-valve assembly of the present invention can drive the flow of the working fluid. The mechanical pump has a main pump and a backup pump. When the main pump and the backup pump switch according to the received command, the loop channel is also automatically switched, and no internal loop or short circuit is formed. The compensator can absorb and compensate the loop working fluid. The weight of the pump-valve assembly does not exceed 1.8kg, and the thermal control of the satellite thermal load of 500W (long-term) can be achieved, and the thermal control of 1.5KW (1 to 4h) can be achieved in a short time. The integrated pump-valve assembly can be widely used in active thermal control systems of high-power loads, deep space exploration spacecraft, etc.

[0044] The contents not described in detail in the specification of the present invention belong to the common knowledge of the professionals in this field.

Claims

1. A small and light integrated pump and valve assembly, characterized in that: It includes a base plate and a main space micro pump, a backup space micro pump, a main one-way valve, a backup one-way valve, a component outlet, a filter, a component inlet, a compensator, an air addition and exhaust valve, an outlet pressure sensor, an inlet pressure sensor, and a base plate installed on the base plate; A one-way valve main part and a one-way valve backup are installed downstream of the spatial micropump main part and the spatial micropump backup respectively, and then connected in parallel through pipelines. The one-way valve main part, the one-way valve backup, the spatial micropump main part and the spatial micropump backup adopt a two-layer layout, and the inlet pressure sensor and the outlet pressure sensor are installed at both ends of the two connections respectively. The inlet pipeline is connected to the filter and the compensator, and the component inlet is connected to the filter. The air addition and exhaust valve is installed on the compensator, and the medium is filled from the component inlet to the fluid circuit. When on track, one of the spatial micropump main part and the spatial micropump backup is working, the downstream one-way valve is opened, and the flow rate is increased to the rated flow rate under the speed condition, so as to realize the circulation of the liquid medium inside the fluid circuit, and the compensator realizes the recovery and replenishment of the medium inside the fluid circuit caused by temperature changes. The fluid circuit is the pipeline through which the medium flows between the component inlet and the component outlet.

2. A light and small integrated pump and valve assembly according to claim 1, characterized in that: The main and backup spatial micropumps are both single-stage centrifugal pumps and brushless permanent magnet motors packaged into an integral structure. The stator and rotor of the brushless permanent magnet motor are separated by a shielding sleeve, and the conveying medium is used to achieve bearing self-lubrication and motor thermal balance control.

3. A light and small integrated pump and valve assembly according to claim 1, characterized in that: The main spatial micropump and the backup spatial micropump change the flow rate of the fluid circuit by speed regulation, use the heat exchange requirements of different heat loads, and achieve speed regulation by changing the duty cycle through a digital circuit.

4. A light and small integrated pump and valve assembly according to claim 1, characterized in that: The main one-way valve and the backup one-way valve utilize a diaphragm structure, which meets the requirements that when the working medium is perfluorotriethylamine, the rated flow rate is 70L / h, the external output pressure head is not less than 0.060MPa, the power consumption does not exceed 10W, and the inlet pressure is ≮70kPa and it works normally.

5. The light and small integrated pump and valve assembly according to claim 1, characterized in that: The main one-way valve and the backup one-way valve are closed in the static state, with a rated flow rate of 70L / h and a working flow range of 50L / h to 70L / h. They can be opened to the full extent, the opening pressure does not exceed 10kPa, and the flow resistance at the rated operating point is not higher than 10kPa.

6. A light and small integrated pump and valve assembly according to claim 1, characterized in that: The compensator adopts a rubber bladder diaphragm storage tank structure. The maximum storage capacity of the medium in the compensator is the same as the maximum expandable volume of the diaphragm. At a low temperature of -25°C, the compensator meets the requirement of an extrusion volume of not less than 70mL; at a high temperature of 65°C, the compensator meets the requirement of an absorption volume of not less than 75mL.

7. A light and small integrated pump and valve assembly according to claim 1, characterized in that: The air adding and discharging valve and the compensator are fixedly connected by welding. During the filling and discharging process of the fluid circuit, the air adding and discharging valve 7 is used to connect the ground inflation equipment and the compensator for inflation and pressurization.

8. The light and small integrated pump and valve assembly according to claim 7, characterized in that: The compensator is filled with nitrogen with a purity higher than 99.99%, and the pressure during medium filling and circuit operation is 0-0.35 MPa.

9. The light and small integrated pump and valve assembly according to claim 1, characterized in that: The filter adopts a two-layer titanium alloy mesh structure, the filtering accuracy of the titanium alloy mesh is better than 50μm, and the filter composed of the two layers of titanium alloy mesh and the component inlet are designed as an integrated structure.

10. The light and small integrated pump and valve assembly according to claim 1, characterized in that: When working in orbit, the main part of the space micropump works, and the speed gradually increases from 0 to the rated speed. When the speed increases and the output pressure exceeds the opening pressure of the main part of the one-way valve, the main part of the one-way valve opens. At this time, the backup part of the space micropump is in the shutdown state, and the backup part of the one-way valve is in the closed state due to the reverse pressure; when the main part of the space micropump is abnormal, the main part of the space micropump is controlled to stop working through external instructions. During the process of speed reduction, the main part of the one-way valve is closed, and the backup part of the space micropump starts to work. When the speed increases and the output pressure exceeds the opening pressure of the backup part of the one-way valve, the backup part of the one-way valve opens, thereby realizing the automatic switching of the main and backup liquid circuits.

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