Automatic filling device of attitude control engine

Abstract

The utility model relates to an automatic filling device for an attitude control engine, which is communicated with a liquid cavity and an air cavity of a metal diaphragm storage tank and comprises a filling container, a hatch filling device and a vacuum pump set, and the filling container is communicated with the liquid cavity of the metal diaphragm storage tank; the hatch filling equipment comprises an air suction container, and the air suction container is communicated with the filling container, a vacuum pump set and a metal diaphragm storage box liquid cavity. The vacuum pump set comprises a first vacuum pump communicated with the air suction container and a liquid cavity of the metal diaphragm storage box and a second vacuum pump communicated with an air cavity of the metal diaphragm storage box. Compared with the prior art, the hatch filling equipment is additionally arranged between the filling container and the metal diaphragm storage box, so that the safety of the device during filling and withdrawing is ensured. And the two vacuum pumps are respectively connected with the liquid cavity and the air cavity of the metal diaphragm storage tank, so that the pressure difference on the two sides of the diaphragm of the metal diaphragm storage tank is accurately controlled.

Description

Technical Field

[0001] This utility model relates to the field of aerospace propulsion technology, and in particular to an automatic refueling device for attitude control engines. Background Technology

[0002] Propellant tanks are an important component of aerospace propulsion systems, primarily responsible for storing and controlling propellant release. Metal diaphragm tanks release propellant by deforming and compressing the metal diaphragm, providing liquid propellant to the engine and enabling functions such as spacecraft attitude control and maneuvering.

[0003] Traditional attitude control engine metal diaphragm tank refueling relies on manual operation, which is difficult to guarantee in terms of accuracy and results in inconsistent refueling volumes. During refueling, the pressure difference across the diaphragm must be controlled to prevent diaphragm flipping or tank structural damage. If any abnormalities occur during refueling, propellant must be drained and the tank cleaned before refueling can begin, or the tank in the system must be replaced, severely impacting mission progress. Furthermore, manual operation may result in propellant exhaust gas leakage, posing a health hazard and causing environmental pollution.

[0004] Therefore, there is an urgent need for an attitude control engine automatic refueling device to solve the problems of low accuracy, poor efficiency, and major safety hazards in traditional refueling methods. Utility Model Content

[0005] The purpose of this invention is to overcome the problems of low precision, poor efficiency, and significant safety hazards in traditional refueling methods by providing an automatic refueling device for attitude control engines, used for refueling the metal diaphragm tank of aerospace attitude control engines.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] The technical solution of this utility model is to provide an automatic refueling device for an attitude control engine, which is connected to the liquid chamber and gas chamber of a metal diaphragm tank, and includes a refueling container, a hatch refueling device, and a vacuum pump set.

[0008] in,

[0009] The filling container is connected to the liquid chamber of the metal diaphragm storage tank;

[0010] The hatch refueling equipment includes a vacuum suction container, which is connected to the refueling container, the vacuum pump set, and the liquid chamber of the metal diaphragm storage tank.

[0011] The vacuum pump assembly includes a first vacuum pump connected to the vacuum container and the liquid chamber of the metal diaphragm storage tank, and a second vacuum pump connected to the gas chamber of the metal diaphragm storage tank.

[0012] As a preferred embodiment, the first and second vacuum pumps are vortex pumps, which are oil-free dry pumps and do not have the phenomenon of vacuum oil backflow, thus ensuring the cleanliness of the system.

[0013] In some specific embodiments, the filling container is provided with a filling port communicating with the suction container, a gas supply port for pressurization, a first pressure gauge, and a weighing device. A first automatic valve is provided at the gas supply port. An external pressurizing gas source, such as helium, is pressurized into the filling container through the first automatic valve.

[0014] More preferably, the first automatic valve is a pneumatic switching valve.

[0015] In some specific embodiments, the filling port is provided with a first pipeline communicating with the vacuum container, and a second automatic valve and a filter are provided on the first pipeline along the direction from the filling container to the vacuum container.

[0016] More preferably, the second automatic valve is a pneumatic switching valve.

[0017] In some specific embodiments, the vacuum container is provided with an interface communicating with the filling container, the first vacuum pump and the liquid chamber of the metal diaphragm storage tank, a second pressure gauge and a fourth automatic valve located at the interface.

[0018] More preferably, the fourth automatic valve is a pneumatic switching valve.

[0019] In some specific embodiments, the interface of the vacuum container is provided with two interconnected third and fifth pipelines. One end of the third pipeline is also connected to the first vacuum pump, and one end of the fifth pipeline is also provided with two branch pipelines, namely the first pipeline and the second pipeline connected to the liquid chamber of the metal diaphragm storage tank.

[0020] In some specific embodiments, a third automatic valve is provided on the second pipeline, and a fifth automatic valve is provided on the third pipeline.

[0021] More preferably, the third automatic valve is a pneumatic regulating valve, used to achieve automatic control of the filling process and filling accuracy.

[0022] More preferably, the third automatic valve is a pneumatic switching valve.

[0023] In some specific embodiments, the metal diaphragm tank includes a liquid filling port connected to the second pipeline and a gas port connected to the second vacuum pump. A fourth pipeline connected to the second vacuum pump is provided at the gas port.

[0024] In some specific embodiments, a first filling service valve is provided at the liquid cavity filling interface, and a second filling service valve is provided at the gas cavity interface.

[0025] In some specific embodiments, the second vacuum pump includes an outlet connected to the fourth pipeline, and a second vacuum gauge and a seventh automatic valve are provided at the outlet end. The second vacuum pump evacuates the gas chamber of the metal diaphragm tank and measures the vacuum level of the gas chamber of the metal diaphragm tank through the second vacuum gauge at its outlet.

[0026] More preferably, the measurement range of the second vacuum gauge is 5 × 10⁻⁶. -1 ~1×10 5 Pa, the seventh automatic valve is an electromagnetic high-vacuum baffle angle valve.

[0027] In some specific embodiments, the first vacuum pump includes an outlet connected to the third pipeline, and a first vacuum gauge and a sixth automatic valve are provided at the outlet end. The first vacuum pump is used to evacuate the liquid chamber of the metal diaphragm tank and the first vacuum gauge at its outlet measures the vacuum level of the liquid chamber of the metal diaphragm tank.

[0028] More preferably, the measuring range of the first vacuum pump is 5 × 10⁻⁶. -1 ~1×10 5 Pa, the sixth automatic valve is an electromagnetic high-vacuum baffle angle valve.

[0029] The weighing device, vacuum pump, valves, and instruments in this automatic propellant loading device for an attitude control engine are all connected to a measurement and control system. The system's preset programs include an automatic vacuuming subroutine and an automatic loading subroutine, which automatically complete the loading process. The automatic vacuuming subroutine effectively controls the pressure difference across the diaphragm of the metal diaphragm tank, preventing abnormal damage to the diaphragm. Before the propellant loading endpoint, the automatic loading subroutine can adjust and reduce the loading rate to ensure loading accuracy and consistency. Both the automatic vacuuming and automatic loading subroutines are conventionally programmed in this field.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] (1) This utility model creatively provides a hatch refueling device between the refueling container and the metal diaphragm tank. The propellant in the refueling pipeline is drawn into the vacuum container by the negative pressure in the vacuum container, ensuring the safety of the device during refueling and withdrawal.

[0032] (2) This utility model uses two vacuum pumps to connect the liquid chamber and the gas chamber of the metal diaphragm tank respectively, so as to precisely control the pressure difference on both sides of the diaphragm of the metal diaphragm tank.

[0033] (3) The attitude control engine automatic refueling device of this utility model has high integration, ensuring the consistency of refueling accuracy and refueling amount. It can achieve a high degree of automation through the assistance of preset programs, that is, automatically complete the refueling work. Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the structure of this utility model.

[0035] The diagram is labeled as follows:

[0036] 1 is the filling container, 2 is the electronic scale, 3 is the hatch filling equipment, 4 is the vacuum container, 5 is the metal diaphragm storage tank, 6 is the vacuum pump set, 7 is the first vacuum pump, 8 is the second vacuum pump, 9 is the first pipeline, 10 is the second pipeline, 11 is the third pipeline, 12 is the fourth pipeline, and 13 is the fifth pipeline.

[0037] V1 is the first automatic valve, V2 is the second automatic valve, V3 is the third automatic valve, V4 is the fourth automatic valve, V5 is the fifth automatic valve, V6 is the sixth automatic valve, V7 is the seventh automatic valve, S1 is the first filling service valve, S2 is the second filling service valve, P1 is the first pressure gauge, P2 is the second pressure gauge, P3 is the first vacuum gauge, P4 is the second vacuum gauge, and F1 is the filter. Detailed Implementation

[0038] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. This embodiment is based on the technical solution of the present invention and provides detailed implementation methods and specific operating procedures; however, the scope of protection of the present invention is not limited to the following embodiments.

[0039] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0040] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0041] In the following embodiments, unless otherwise specified, the functional components or structures are conventional components or structures used in the art to achieve the corresponding functions.

[0042] Example 1:

[0043] like Figure 1As shown, an attitude control engine automatic refueling device is connected to the liquid and gas chambers of a metal diaphragm tank 5. It includes a refueling container 1, a hatch refueling device 3, and a vacuum pump assembly 6. The refueling container 1 is connected to the liquid chamber of the metal diaphragm tank 5. The hatch refueling device 3 includes a vacuum suction container 4, which is connected to the refueling container 1, the vacuum pump assembly 6, and the liquid chamber of the metal diaphragm tank 5. The vacuum pump assembly 6 includes a first vacuum pump 7 connected to the vacuum suction container 4 and the liquid chamber of the metal diaphragm tank 5, and a second vacuum pump 8 connected to the gas chamber of the metal diaphragm tank 5.

[0044] In this technical solution, on the one hand, the first vacuum pump 7 evacuates the vacuum container 4 to a vacuum state (vacuum value ≤ 500Pa). The negative pressure inside the vacuum container 4 draws the propellant from the filling pipeline into the vacuum container 4, ensuring no propellant leakage during filling and withdrawal, effectively solving safety hazards. On the other hand, by connecting the liquid chamber and gas chamber of the metal diaphragm tank 5 to the first vacuum pump 7 and the second vacuum pump 8 respectively, the pressure difference across the diaphragm of the metal diaphragm tank 5 is controlled, effectively preventing abnormal damage to the metal diaphragm tank 5. For example, the first vacuum pump 7 and the second vacuum pump 8 are vortex pumps, which are oil-free dry pumps, eliminating vacuum backflow and ensuring system cleanliness.

[0045] More specifically, the refueling container 1 is equipped with a refueling interface connected to the vacuum container 4, a pressurization gas supply interface, a first pressure gauge P1, and a weighing device 2. The gas supply interface is equipped with a first automatic valve V1. An external pressurizing gas source, such as helium, pressurizes the refueling container 1 through the first automatic valve V1. The first pressure gauge P1 is used to measure the pressure inside the refueling container 1, and the weighing device 2 is used to measure and determine whether the propellant in the refueling pipeline is completely filled. The refueling interface is equipped with a first pipeline 9 connected to the vacuum container 4. Along the direction from the refueling container 1 to the vacuum container 4, the first pipeline 9 is equipped with a second automatic valve V2 and a filter F1. For example, the filter F1 is a stainless steel filter with a filtration accuracy of 5μm, and the first automatic valve V1 and the second automatic valve V2 are pneumatic switching valves.

[0046] The vacuum container 4 is equipped with an interface communicating with the filling container 1, the first vacuum pump 7, and the liquid chamber of the metal diaphragm storage tank 5, a second pressure gauge P2, and a fourth automatic valve V4 located at the interface. The interface of the vacuum container 4 has two interconnected third pipes 11 and fifth pipes 13. One end of the third pipe 11 is also connected to the first vacuum pump 7, and one end of the fifth pipe 13 is further connected to the first pipe 9 and a second pipe 10 communicating with the liquid chamber of the metal diaphragm storage tank 5. A third automatic valve V3 is located on the second pipe 10, and a fifth automatic valve V5 is located on the third pipe 11. For example, the third automatic valve V3 is a pneumatic regulating valve used to automatically control the filling process and filling accuracy. The fourth automatic valve V4 and the fifth automatic valve V5 are pneumatic on / off valves.

[0047] The metal diaphragm tank 5 includes a liquid filling port connected to the second pipeline 10 and a gas filling port connected to the second vacuum pump 8. A fourth pipeline 12 connected to the second vacuum pump 8 is provided at the gas filling port. A first filling service valve S1 is provided at the liquid filling port, and a second filling service valve S2 is provided at the gas filling port.

[0048] The second vacuum pump 8 includes an outlet connected to the fourth pipeline 12, and a second vacuum gauge P4 and a seventh automatic valve V7 are provided at the outlet end. The second vacuum pump 8 evacuates the gas chamber of the metal diaphragm tank 5 and measures the vacuum level of the gas chamber of the metal diaphragm tank 5 through the second vacuum gauge P4 at its outlet. The first vacuum pump 7 includes an outlet connected to the third pipeline 11, and a first vacuum gauge P3 and a sixth automatic valve V6 are provided at the outlet end. The first vacuum pump 7 evacuates the liquid chamber of the metal diaphragm tank 5 and measures the vacuum level of the liquid chamber of the metal diaphragm tank 5 through the first vacuum gauge P3 at its outlet. For example, the measuring range of the first vacuum gauge P3 and the second vacuum gauge P4 is 5 × 10⁻⁶. -1 ~1×10 5 Pa, the sixth automatic valve V6 and the seventh automatic valve V7 are electromagnetic high vacuum baffle angle valves.

[0049] Based on the functional description of each component in this embodiment, the usage process of the device in this embodiment will now be explained:

[0050] Step 1: Vacuum container 4

[0051] Start the first vacuum pump 7, and sequentially open the sixth automatic valve V6 at the outlet of the first vacuum pump 7, the fifth automatic valve V5 on the third pipeline 11, and the fourth automatic valve V4 at the interface of the suction container 4 to evacuate the suction container 4. When the first vacuum gauge P3 at the outlet of the first vacuum pump 7 displays a vacuum value ≤ 500 Pa, sequentially close the fourth automatic valve V4 at the interface of the suction container 4, the fifth automatic valve V5 on the third pipeline 11, and the sixth automatic valve V6 at the outlet of the first vacuum pump 7 to stop the first vacuum pump 7.

[0052] Step 2: Vacuuming the metal diaphragm storage tank 5

[0053] Before filling, manually open the first filling service valve S1 connected to the liquid chamber of the metal diaphragm tank 5 and the second filling service valve S2 connected to the gas chamber of the metal diaphragm tank 5; use a vacuum pump to evacuate the gas chamber and liquid chamber of the metal diaphragm tank 5 respectively, and ensure that the pressure in the gas chamber is lower than the pressure in the liquid chamber during the evacuation process.

[0054] Start the second vacuum pump 8 and open the seventh automatic valve V7 at the outlet of the second vacuum pump 8 to begin evacuating the gas chamber of the metal diaphragm tank 5. When the second vacuum gauge P4 at the outlet of the second vacuum pump 8 displays a vacuum value ≤1000Pa, start the first vacuum pump 7 and sequentially open the sixth automatic valve V6 at the outlet of the first vacuum pump 7, the fifth automatic valve V5 on the third pipeline 11, and the third automatic valve V3 on the second pipeline 10 to begin evacuating the liquid chamber of the metal diaphragm tank 5. When the vacuum value of the liquid chamber of the metal diaphragm tank 5 is lower than 50Pa, close the sixth automatic valve V6 at the outlet of the first vacuum pump 7 to stop evacuating the liquid chamber of the metal diaphragm tank 5. After 3 minutes, if the vacuum value of the liquid chamber of the metal diaphragm tank 5 (displayed by the first vacuum gauge P3) is still lower than 100Pa, the evacuation is complete, the fifth automatic valve V5 on the third pipeline 11 is closed, and the first vacuum pump 7 is stopped.

[0055] Step 3: Filling the propellant lines

[0056] Manually close the first refueling service valve S1.

[0057] The external pressurized air source is adjusted to a pressure of 0.2–0.3 MPa. After opening the first automatic valve V1, the filling container 1 is pressurized. The second automatic valve V2 and the third automatic valve V3 are opened in sequence to fill the filling pipeline. The electronic scale 2 is observed. When the value remains stable, the filling pipeline is filled and the third automatic valve V3 is closed.

[0058] Step 4: Propellant loading

[0059] Manually open the first refueling service valve S1 and the third automatic valve V3 to begin propellant refueling.

[0060] The filling amount is set to M. When the filling amount reaches 95% of M, the third automatic valve V3 gradually reduces the valve opening and the filling rate to improve the filling accuracy. When the filling amount M is reached, the third automatic valve V3 is completely closed.

[0061] Close the first refueling service valve S1 and close the second refueling service valve S2;

[0062] Close the second automatic valve V2; close the seventh automatic valve V7, stop the second vacuum pump 8, and stop the vacuuming of the gas chamber of the metal diaphragm tank 5.

[0063] Step 5: Withdrawal

[0064] Open the third automatic valve V3 and the fourth automatic valve V4, and use the negative pressure inside the suction container 4 to draw the propellant in the filling pipeline into the suction container 4, ensuring that there is no propellant leakage when the device is withdrawn.

[0065] Finally, disconnect all pipelines connected to the metal diaphragm tank 5 and seal the filling service valve interface of the metal diaphragm tank 5.

[0066] Example 2:

[0067] Based on the attitude control engine automatic refueling device of Embodiment 1, in this embodiment, the weighing device 2, the first vacuum pump 7, the second vacuum pump 8, various valves, and various instruments are all connected to the measurement and control system. The preset program of the measurement and control system includes an automatic vacuuming subroutine and an automatic refueling subroutine, and the refueling work is automatically completed through the preset program of the measurement and control system.

[0068] The automatic vacuuming subroutine fully considers the pressure difference control across the diaphragm of the metal diaphragm tank, effectively preventing abnormal damage to the metal diaphragm. Before the end of propellant loading, the automatic loading subroutine adjusts and reduces the loading rate to ensure loading accuracy and consistency of loading volume. Both the automatic vacuuming subroutine and the automatic loading subroutine are routinely set procedures in this field.

[0069] Based on the functional description of each component in this embodiment, the usage process of the device in this embodiment will now be explained:

[0070] Step 1: Vacuum container 4

[0071] Start the first vacuum pump 7, and sequentially open the sixth automatic valve V6 at the outlet of the first vacuum pump 7, the fifth automatic valve V5 on the third pipeline 11, and the fourth automatic valve V4 at the interface of the suction container 4 to evacuate the suction container 4. When the first vacuum gauge P3 at the outlet of the first vacuum pump 7 displays a vacuum value ≤ 500 Pa, sequentially close the fourth automatic valve V4 at the interface of the suction container 4, the fifth automatic valve V5 on the third pipeline 11, and the sixth automatic valve V6 at the outlet of the first vacuum pump 7 to stop the first vacuum pump 7.

[0072] Step 2: Vacuuming the metal diaphragm storage tank 5

[0073] Before filling, manually open the first filling service valve S1 connected to the liquid chamber of the metal diaphragm tank 5 and the second filling service valve S2 connected to the gas chamber of the metal diaphragm tank 5; use a vacuum pump to evacuate the gas chamber and liquid chamber of the metal diaphragm tank 5 respectively, and ensure that the pressure in the gas chamber is lower than the pressure in the liquid chamber during the evacuation process.

[0074] Start the second vacuum pump 8 and open the seventh automatic valve V7 at the outlet of the second vacuum pump 8 to begin evacuating the gas chamber of the metal diaphragm tank 5. When the second vacuum gauge P4 at the outlet of the second vacuum pump 8 displays a vacuum value ≤1000Pa, start the first vacuum pump 7 and sequentially open the sixth automatic valve V6 at the outlet of the first vacuum pump 7, the fifth automatic valve V5 on the third pipeline 11, and the third automatic valve V3 on the second pipeline 10 to begin evacuating the liquid chamber of the metal diaphragm tank 5. When the vacuum value of the liquid chamber of the metal diaphragm tank 5 is lower than 50Pa, close the sixth automatic valve V6 at the outlet of the first vacuum pump 7 to stop evacuating the liquid chamber of the metal diaphragm tank 5. After 3 minutes, if the vacuum value of the liquid chamber of the metal diaphragm tank 5 (displayed by the first vacuum gauge P3) is still lower than 100Pa, the evacuation is complete, the fifth automatic valve V5 on the third pipeline 11 is closed, and the first vacuum pump 7 is stopped.

[0075] All of the above vacuuming operations are controlled by an automatic vacuuming subroutine.

[0076] Step 3: Filling the propellant lines

[0077] Manually close the first refueling service valve S1.

[0078] The external pressurized air source is adjusted to a pressure of 0.2–0.3 MPa. After opening the first automatic valve V1, the filling container 1 is pressurized. The second automatic valve V2 and the third automatic valve V3 are opened in sequence to fill the filling pipeline. The electronic scale 2 is observed. When the value remains stable, the filling pipeline is filled and the third automatic valve V3 is closed.

[0079] Step 4: Propellant loading

[0080] Manually open the first refueling service valve S1 and the third automatic valve V3 to begin propellant refueling.

[0081] The filling amount is set to M. When the filling amount reaches 95% of M, the third automatic valve V3 gradually reduces the valve opening and the filling rate to improve the filling accuracy. When the filling amount M is reached, the third automatic valve V3 is completely closed.

[0082] Close the first refueling service valve S1 and close the second refueling service valve S2;

[0083] Close the second automatic valve V2; close the seventh automatic valve V7, stop the second vacuum pump 8, and stop the vacuuming of the gas chamber of the metal diaphragm tank 5.

[0084] All of the above propellant loading operations are controlled by an automatic loading subroutine.

[0085] Step 5: Withdrawal

[0086] Open the third automatic valve V3 and the fourth automatic valve V4, and use the negative pressure inside the suction container 4 to draw the propellant in the filling pipeline into the suction container 4, ensuring that there is no propellant leakage when the device is withdrawn.

[0087] Finally, disconnect all pipelines connected to the metal diaphragm tank 5 and seal the filling service valve interface of the metal diaphragm tank 5.

[0088] The above description of the embodiments is provided to enable those skilled in the art to understand and use the utility model. It will be apparent to those skilled in the art that various modifications can be easily made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present utility model is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present utility model without departing from its scope should be within the protection scope of the present utility model.

Claims

1. An automatic filling device for an attitude control engine, communicating with the liquid chamber and the gas chamber of a metal diaphragm tank (5), characterized in that, The invention relates to a filling device for liquid propellant, comprising a filling container (1), a hatch filling device (3), a vacuum pump set (6), wherein, the filling container (1) is in liquid communication with a metal diaphragm tank (5); the hatch filling device (3) comprises a suction container (4) in liquid communication with the filling container (1), the vacuum pump set (6) and the metal diaphragm tank (5) respectively; the vacuum pump set (6) comprises a first vacuum pump (7) in liquid communication with the suction container (4) and the metal diaphragm tank (5) and a second vacuum pump (8) in gas communication with the metal diaphragm tank (5).

2. The attitude control engine auto-filling device of claim 1, wherein, the filling container (1) is provided with a filling interface in communication with the suction container (4), a gas source supply interface for pressurization, a first pressure gauge (P1) and a weigher (2), and the gas source supply interface is provided with a first automatic valve (V1).

3. The attitude control engine auto-filling device of claim 2, wherein, the filling interface is provided with a first pipeline (9) in communication with the suction container (4), and the first pipeline (9) is provided with a second automatic valve (V2) and a filter (F1) in the direction from the filling container (1) to the suction container (4).

4. The attitude control engine auto-filling device of claim 1, wherein, the suction container (4) is provided with an interface in communication with the filling container (1), the first vacuum pump (7) and the metal diaphragm tank (5), a second pressure gauge (P2) and a fourth automatic valve (V4) arranged at the interface.

5. The attitude control engine auto-prime device of claim 3, wherein, the interface of the suction container (4) is provided with two third pipelines (11) and a fifth pipeline (13) in communication with each other, one end of the third pipeline (11) is further in communication with the first vacuum pump (7), and one end of the fifth pipeline (13) is further provided with two branch pipelines, which are a first pipeline (9) and a second pipeline (10) in liquid communication with the metal diaphragm tank (5) respectively.

6. The attitude control engine auto-filling device of claim 5, wherein, the second pipeline (10) is provided with a third automatic valve (V3), and the third pipeline (11) is provided with a fifth automatic valve (V5).

7. The attitude control engine auto-filling device of claim 5, wherein, the first vacuum pump (7) comprises an outlet in communication with the third pipeline (11), and the outlet end is provided with a first vacuum gauge (P3) and a sixth automatic valve (V6).

8. The attitude control engine auto-prime device of claim 5, wherein, the metal diaphragm tank (5) comprises a liquid cavity filling interface in communication with the second pipeline (10) and a gas cavity interface in communication with the second vacuum pump (8), and the gas cavity interface is provided with a fourth pipeline (12) in communication with the second vacuum pump (8).

9. The attitude control engine auto-filling device of claim 8, wherein, the liquid cavity filling interface is provided with a first filling service valve (S1), and the gas cavity interface is provided with a second filling service valve (S2).

10. The attitude control engine auto-prime device of claim 8, wherein, the second vacuum pump (8) comprises an outlet in communication with the fourth pipeline (12), and the outlet end is provided with a second vacuum gauge (P4) and a seventh automatic valve (V7).

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