A spatial droplet generator and a method of controlling the accuracy of its jet direction

Abstract

The application is a space droplet generator and a spraying direction accuracy control method thereof, comprising a main shaft, a bearing seat, a shell, a bearing stop seat, a spraying disc, a first deep groove ball bearing and a second deep groove ball bearing; the main shaft is arranged in the shell along the central axis of the shell; one end of the main shaft is used for connecting a motor to realize rotation, and the other end of the main shaft is provided with a liquid working medium flow storage section, which comprises a working medium channel and a liquid storage cavity in communication with the working medium channel; a side channel for the liquid working medium to pass through is arranged in the middle of the shell, and the working medium channel is in communication with the side channel; the spraying disc is arranged at the end of the liquid storage cavity, and the liquid working medium enters the liquid storage cavity through the side channel and the working medium channel and is sprayed from the spraying disc; according to the machining accuracy of each component of the space droplet generator, the uncertainty of the spraying direction accuracy of the space droplet generator is calculated, and the accurate control of the spraying direction accuracy can be realized by controlling the machining accuracy.

Description

Technical Field

[0001] This invention relates to space droplet radiators in spacecraft, and more specifically to a space droplet generator and a method for controlling the precision of its jet pointing. Background Technology

[0002] In the space environment, spacecraft can only transfer heat outward through radiation. Space droplet radiators are a novel and efficient heat dissipation method. A droplet radiator mainly consists of a droplet generator, a droplet collector, a heat exchange system, and fluid conduits. The liquid working fluid that absorbs heat is ejected from the droplet generator, forming a group of droplets moving according to a certain pattern. These droplets travel a certain distance in space, radiating heat, and are then recovered by the liquid collector. Space droplet radiators have advantages such as high scattering efficiency and a small heat dissipation system mass. Their heat dissipation efficiency is mainly affected by the diameter, distribution characteristics, and motion patterns of the droplet group.

[0003] The space droplet generator is a crucial component of the space droplet radiator, enabling efficient generation and uniform distribution of droplet swarms. The droplet swarm ejected from the space droplet generator possesses a tangential velocity, exhibiting a frustum-shaped spatial distribution. Furthermore, the spacing between droplets gradually increases during their spatial motion, resulting in strong heat exchange efficiency. However, the inherent uncertainty in the jetting accuracy of the space droplet generator increases the difficulty of droplet swarm collection. Moreover, the uncertainty in jetting accuracy is further amplified by the rotational speed of the space droplet generator. Therefore, to compensate for these issues, the jetting accuracy requirements for the space droplet generator are extremely high.

[0004] When the precision of droplet ejection is highly uncertain, the collection area of ​​the droplet collector can far exceed the theoretical distribution area of ​​the droplets, resulting in a sharp increase in the volume and mass of the droplet radiation collector. Precise control of the droplet swarm's distribution area would greatly simplify the design of the droplet collector; therefore, a space droplet generator with high ejection pointing precision is needed. Summary of the Invention

[0005] The purpose of this invention is to solve the technical problems of high uncertainty in the spraying accuracy of existing space droplet generators and difficulty in collecting the sprayed droplet groups, and to provide a space droplet generator and a method for controlling the spraying direction accuracy.

[0006] The concept of this invention is to calculate the uncertainty of the jet pointing accuracy of the space droplet generator based on the machining accuracy of each component, and then achieve precise control of the jet pointing accuracy by controlling the machining accuracy.

[0007] To achieve the above objectives and complete the above inventive concept, the technical solution adopted by this invention is as follows:

[0008] A space droplet generator, characterized in that it includes a main shaft, a bearing housing, a housing, a bearing stop, a jet disc, a first deep groove ball bearing, and a second deep groove ball bearing;

[0009] The main shaft is installed inside the housing along the central axis, and a wire channel is arranged along the axis inside the main shaft. One end of the main shaft is used to connect to the drive motor to achieve rotation, and also serves as the wire entry end of the excitation device. The other end is provided with a liquid working fluid flow storage section, which includes a liquid storage chamber and a working fluid channel connected to it at one end. The excitation device is installed on the side wall of the liquid storage chamber near the wire channel port. The middle part of the housing is provided with a side channel for the liquid working fluid to pass through. The other end of the working fluid channel is connected to one end of the side channel through an annular cavity set between the housing and the main shaft. The spray plate is located at the outer end of the liquid storage chamber and is provided with spray holes, which are arranged in an axial or parallel direction. After the liquid working fluid enters the liquid storage chamber through the side channel and the working fluid channel, it is excited by the excitation device set in the liquid storage chamber and sprayed out from the spray holes of the spray plate.

[0010] The first deep groove ball bearing and the second deep groove ball bearing are located at both ends inside the housing, and are disposed between the main shaft and the housing; the first deep groove ball bearing is disposed at one end near the main shaft and is fixed to the housing by a bearing seat; the second deep groove ball bearing is disposed at the other end near the main shaft and is fixed to the housing by a bearing stop.

[0011] Furthermore, it also includes a first dynamic seal and a second dynamic seal; both the first dynamic seal and the second dynamic seal are disposed between the spindle and the housing, the first dynamic seal is located on the side of the annular cavity near the second deep groove ball bearing, and the second dynamic seal is located on the side of the annular cavity near the first deep groove ball bearing; the first dynamic seal and the second dynamic seal achieve dynamic sealing between the spindle and the housing.

[0012] Furthermore, an annular boss is provided on the outer side of the middle part of the main shaft, and the second dynamic seal is provided between the annular boss and the housing; a bushing is also fitted on the main shaft, and the two ends of the bushing abut against the inner ring of the first deep groove ball bearing and the stepped surface of the annular boss, respectively.

[0013] Furthermore, on the main shaft, a first boss and a second boss are sequentially arranged from the inside to the outside between the annular boss and the other end, and the outer diameter of the second boss is larger than the outer diameter of the first boss; the first dynamic seal is arranged between the first boss and the housing, the second deep groove ball bearing is arranged between the second boss and the housing, and the liquid storage cavity is located inside the second boss; an annular groove is provided on the inner side of the housing, and the inner wall of the annular groove, the outer wall of the end of the annular boss near the other end of the main shaft, the outer wall of the main shaft, and the outer wall of the end of the second boss near the annular boss form the annular cavity; the other end of the working fluid channel is located on the stepped surface of the second boss.

[0014] Furthermore, the main shaft and the spray disc are connected by threads; the spray disc is evenly distributed with spray holes, the number of which is 20 to 50, and the diameter of the spray holes is 0.5 to 2 mm.

[0015] A method for controlling the injection pointing accuracy of a space droplet generator, used in the aforementioned space droplet generator, is characterized by including the following steps:

[0016] Step 1: Design the space droplet generator according to the design requirements;

[0017] Step 2: Obtain the axis pointing accuracy θ1 of the main shaft of the space droplet generator, the disk-shaft connection accuracy θ2 between the jet disk and the main shaft, and the nozzle pointing accuracy θ3, to obtain the total uncertainty of the jet pointing accuracy of the space droplet generator θ1+θ2+θ3.

[0018] Step 3: Define the maximum uncertainty of the jet pointing accuracy of the space droplet generator as θ. max If θ1+θ2+θ3≤θ max If the space droplet generator meets the design requirements, the jet pointing accuracy control of the space droplet generator is achieved; if θ1+θ2+θ3>θ max Then return to step 1 and redesign the space droplet generator until θ1+θ2+θ3≤θ max .

[0019] Furthermore, in step 2, the specific method for obtaining the axial pointing accuracy θ1 of the main shaft of the spatial droplet generator is as follows:

[0020] Step 21.1: Obtain the maximum machining error δ of the spindle on the first and fifth mating surfaces. 17 δ 18 And machining coaxiality β1; wherein, the first mating surface is the mating surface between the main spindle and the first deep groove ball bearing; the fifth mating surface is the mating surface between the main spindle and the second deep groove ball bearing;

[0021] Step 21.2: Obtain the maximum machining error δ of the bearing housing on the second and third mating surfaces.27 δ 23 The coaxiality is β2; the second mating surface is the mating surface between the bearing housing and the first deep groove ball bearing; the third mating surface is the mating surface between the bearing housing and the housing.

[0022] Step 21.3: Obtain the maximum machining error δ of the shell on the third and fourth mating surfaces. 32 δ 38 And machining coaxiality β3; wherein the fourth mating surface is the mating surface between the housing and the second deep groove ball bearing;

[0023] Step 21.4: Obtain the maximum tolerance δ of the first deep groove ball bearing on the first mating surface. 72 The radial runout σ1 on the second mating surface; the maximum tolerance δ of the second deep groove ball bearing on the fourth mating surface. 83 And the radial runout σ2 on the fifth mating surface;

[0024] Step 21.5, according to the following formula, the axis pointing accuracy θ1 is obtained:

[0025] θ1=arctan((|δ 17 |+|δ 18 |+|δ 27 |+|δ 23 |+|δ 32 |+|δ 38 |+|δ 72 |+|δ 83 |+β1+β2+β3+σ1+σ2) / L)

[0026] Where L is the distance between the first deep groove ball bearing and the second deep groove ball bearing.

[0027] Furthermore, in step 2, the specific method for obtaining the disc-shaft connection accuracy θ2 between the injection disc and the main shaft is as follows:

[0028] Obtain the perpendicularity α1 of the sixth mating surface of the spindle and the injection disc relative to the fourth mating surface, and then obtain the disc-spindle connection accuracy θ2=α1.

[0029] Furthermore, in step 2, the specific method for obtaining the nozzle pointing accuracy θ3 is as follows:

[0030] Step 23.1: Obtain the perpendicularity α2 between the nozzle axis on the spray disk and its outer surface, and obtain the angular deviation α2 of the nozzle axis relative to the outer surface of the spray disk.

[0031] Step 23.2: Obtain the parallelism deviation u1 between the inner and outer surfaces of the injection disc, and obtain the angular deviation u1 between the inner and outer surfaces of the injection disc;

[0032] Step 23.3, according to the following formula, the nozzle pointing accuracy θ3 is obtained:

[0033] θ3=α2+u1.

[0034] Furthermore,

[0035] In step 3, if θ1 + θ2 + θ3 > θ max If so, return to step 1 and establish the injection accuracy control equation to recalculate and determine the machining accuracy of the spindle, bearing housing, shell and injection disk of the space droplet generator;

[0036] The injection accuracy control equation is as follows:

[0037] min f=k1|δ 17 |+k1|δ 18 |+k1|δ 27 |+k1|δ 23 |+k1|δ 32 |+k1|δ 38 |+K2|β1|+k2|β2|+K2|β3|++K3α1+k3α2+k4u1

[0038] Among them, k1 is the difficulty of machining the circular surfaces of the spindle, bearing housing, and housing; k2 is the difficulty of ensuring the coaxiality of the spindle, bearing housing, and housing; k3 is the difficulty of ensuring the perpendicularity of the spray disc; and k4 is the difficulty of ensuring the parallelism of the spray nozzles of the spray disc.

[0039] Compared with the prior art, the present invention has the following beneficial technical effects:

[0040] 1. The space droplet generator and its jet pointing accuracy control method of the present invention can calculate the maximum uncertainty of the jet pointing accuracy of the space droplet generator based on the assembly structure and processing error of the space droplet generator, which is of great significance for the use of the space droplet generator.

[0041] 2. The space droplet generator and its jet pointing accuracy control method of the present invention can adjust the processing accuracy of each component according to the processing technology level during the design stage of the space droplet generator, thereby realizing precise control of the jet pointing accuracy of the space droplet generator. Moreover, it adopts the simplest processing technology to ensure the optimal jet pointing accuracy, making up for the shortcomings of the traditional space droplet generator design process where the jet pointing accuracy is difficult to control. Attached Figure Description

[0042] Figure 1 This is a schematic diagram of the structure of an embodiment of the space droplet generator of the present invention;

[0043] Figure 2 This is a schematic diagram of the axial pointing deviation of an embodiment of the space droplet generator of the present invention;

[0044] The annotations in the attached figures are explained as follows:

[0045] 1-Main shaft, 2-Bearing housing, 3-Housing, 4-Bearing stop, 5-Spray disc, 6-Sleeve, 7-First deep groove ball bearing, 8-Second deep groove ball bearing, 9-First dynamic seal, 10-Second dynamic seal, 11-First mating surface, 12-Second mating surface, 13-Third mating surface, 14-Fourth mating surface, 15-Fifth mating surface, 16-Sixth mating surface, 111-Working medium channel, 112-Reservoir chamber, 113-Side channel. Detailed Implementation

[0046] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0047] like Figure 1 As shown, the present invention discloses a method for calculating and controlling the spray pointing accuracy of a space droplet generator, which mainly comprises: a main shaft 1, a bearing housing 2, a housing 3, a bearing stop 4, a spray disk 5, a bushing 6, a first deep groove ball bearing 7, a second deep groove ball bearing 8, a first dynamic seal 9, and a second dynamic seal 10. The main shaft 1 is fixed to the housing 3 using the first deep groove ball bearing 7 and the second deep groove ball bearing 8. The left side of the main shaft 1 is connected to a motor, enabling rotation of the shaft 1. The distance between the first deep groove ball bearing 7 and the second deep groove ball bearing 8 is L. The liquid working medium enters through a side channel of the housing 3, passes through the main shaft 1, and is excited by an excitation device, then sprayed out from the spray disk 5. The spray disk 5 has 20-50 uniformly arranged spray holes with a diameter of 0.5-2 mm. The first dynamic seal 9 and the second dynamic seal 10 provide a dynamic seal between the main shaft 1 and the housing 3, ensuring that the liquid working medium does not leak.

[0048] The jet pointing accuracy of the space droplet generator is mainly composed of the shaft pointing accuracy θ1, the disc-shaft connection accuracy θ2, and the nozzle pointing accuracy θ3. The shaft pointing accuracy θ1 is controlled by the fit accuracy of the first mating surface 11 between shaft 1 and the first deep groove ball bearing 7, the second mating surface 12 between bearing housing 2 and the first deep groove ball bearing 7, the third mating surface 13 between bearing housing 2 and housing 3, the fourth mating surface 14 between housing 3 and the second deep groove ball bearing 8, and the fifth mating surface 15 between main shaft 1 and the second deep groove ball bearing 8. The disc-shaft connection accuracy θ2 is controlled by the fit accuracy of the sixth mating surface 16 between main shaft 1 and the jet disc 5. The nozzle pointing accuracy θ3 is controlled by the machining accuracy of the jet disc 5 and the drilling accuracy of the nozzles. The total uncertainty of the jet pointing accuracy is θ1 + θ2 + θ3.

[0049] The calculation method for axis pointing accuracy θ is as follows: the maximum machining error of spindle 1 on the first mating surface 11 and the fifth mating surface 15 is δ. 17 and δ18 The coaxiality of the machining is β1; the maximum machining error of the bearing housing 2 on the second mating surface 12 and the third mating surface 13 is δ. 27 and δ 23 The coaxiality of the machining is β2; the maximum machining δ of the shell 3 on the third mating surface 13 and the fourth mating surface 14 is... 32 and δ 38 The coaxiality of the machining is β3; the maximum tolerance of the first deep groove ball bearing 7 on the first mating surface 11 and the second mating surface 12 is δ. 72 The radial runout is σ1; the maximum sum of the tolerances of the second deep groove ball bearing 8 on the fourth mating surface 14 and the fifth mating surface 15 is δ. 83 The radial runout is σ2.

[0050] like Figure 2 As shown, the pointing accuracy θ1 of the axis is,

[0051] θ1=arctan((|δ 17 |+|δ 18 |+|δ 27 |+|δ 23 |+|δ 32 |+|δ 38 |+|δ 72 |+|δ 83 |+β1+β2+σ1+σ2) / L).

[0052] The calculation method for the disc-shaft connection accuracy θ2 is as follows: The main shaft 1 and the spray disc 5 are connected by a thread and positioned by the sixth mating surface 16. The perpendicularity of the shaft 1 on the sixth mating surface 16 relative to the fourth mating surface 14 is α1. The installation error between the spray disc 5 and the main shaft 1 is α1. Therefore, the disc-shaft connection accuracy θ2 = α1.

[0053] The method for calculating the nozzle pointing accuracy θ3 is as follows: the perpendicularity of the nozzle axis on the spray disk 5 to its outer surface is α2, then the angular deviation of the nozzle axis relative to the outer surface of the spray disk is α2; the parallelism deviation of the inner and outer surfaces of the spray disk 5 is u1, then the angular deviation of the inner and outer surfaces of the spray disk is u1, then the nozzle pointing accuracy θ3 = α2 + u1.

[0054] The actual jet pointing accuracy of a space droplet generator is affected by the manufacturing process, which increases the difficulty of jet accuracy control. To achieve precise jet accuracy control, the machining accuracy of each component must be determined based on the level of manufacturing technology, thereby achieving precise control of the jet pointing accuracy. When the design requires the jet pointing accuracy of the space droplet generator to be no greater than θ... max The least squares method is used to solve the control equation for the injection pointing accuracy, thereby obtaining the machining accuracy of the main shaft 1, bearing housing 2, housing 3, and injection disc 5. Among them, the first deep groove ball bearing 7 and the second deep groove ball bearing 8 are finished parts, and their accuracy is determined by themselves.

[0055] The jet pointing accuracy control equation can be described as follows:

[0056] min f=k1|δ 17 |+k1|δ 18 |+k1|δ 27 |+k1|δ 23 |+k1|δ 32 |+k1|δ 38 |+K2|β1|+K2|β2|+K2|β3|++k3α1+k3α2+k4u1

[0057] To meet design and assembly requirements, the machining tolerances must satisfy the following constraints:

[0058]

[0059] In the formula, k1 represents the ease or difficulty of machining the circular surfaces of the main spindle 1, bearing housing 2, and housing 3; k2 represents the ease or difficulty of achieving coaxiality of the main spindle 1, bearing housing 2, and housing 3; k3 represents the ease or difficulty of achieving perpendicularity of the spray disc 5; and k4 represents the ease or difficulty of achieving parallelism of the spray holes in the spray disc 5. The range of these values ​​can be determined based on the level of machining technology. When k1 = 1, 0.01 ≤ |δ| < 0.02; when k1 = 2, 0.001 ≤ |δ| < 0.01; when k1 = 3, |δ| < 0.001. When k2 = 1, 0.005 ≤ β < 0.01; when k2 = 2, 0.001 ≤ β < 0.005; when k2 = 3, β < 0.001. When k3 = 1, 0.005 ≤ α < 0.01; when k3 = 2, 0.001 ≤ α < 0.005; when k3 = 3, α < 0.001. When k4 = 1, 0.005 ≤ u < 0.01; when k4 = 2, 0.001 ≤ u < 0.005; when k4 = 3, u < 0.001.

[0060] A method for controlling the jet pointing accuracy of a space droplet generator mainly relies on the level of manufacturing process. By controlling the manufacturing accuracy of each component, including maximum manufacturing error, perpendicularity, parallelism, and coaxiality, precise control of the jet pointing accuracy is achieved. The specific steps for controlling the jet pointing accuracy are as follows:

[0061] Step 1: Design the space droplet generator according to the design requirements;

[0062] Step 2: Obtain the axis pointing accuracy θ1 of the main shaft 1 of the space droplet generator, the disk-shaft connection accuracy θ2 between the jet disk 5 and the main shaft 1, and the nozzle pointing accuracy θ3, and obtain the total uncertainty of the jet pointing accuracy of the space droplet generator θ1+θ2+θ3.

[0063] Step 3: Define the maximum uncertainty of the jet pointing accuracy of the space droplet generator as θ. max If θ1+θ2+θ3≤θ max The space droplet generator meets the design requirements; if θ1+θ2+θ3>θ max Solve the set of equations for calculating machining accuracy to determine the machining accuracy of the main shaft 1, bearing seat 2, housing 3 and jet disk 5 of the space droplet generator.

[0064] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the present invention.

Claims

1. A space droplet generator, characterized in that: Includes a main shaft (1), bearing housing (2), housing (3), bearing stop (4), injection disc (5), first deep groove ball bearing (7), and second deep groove ball bearing (8); The main shaft (1) is arranged inside the housing (3) along the central axis of the housing (3); one end of the main shaft (1) is used to connect to the drive motor to achieve rotation, and the other end is provided with a liquid working fluid flow storage section, which includes a liquid storage chamber (112) and a working fluid channel (111) connected to it at one end; a side channel (113) for liquid working fluid to pass through is provided in the middle of the housing (3), and the other end of the working fluid channel (111) is connected to one end of the side channel (113) through an annular cavity provided between the housing (3) and the main shaft (1); the spray disk (5) is provided at the outer end of the liquid storage chamber (112), and spray holes are arranged on it, which are arranged in the axial direction or parallel to the axial direction; after the liquid working fluid enters the liquid storage chamber (112) through the side channel (113) and the working fluid channel (111), it is excited by the excitation device provided in the liquid storage chamber (112) and sprayed out from the spray holes of the spray disk (5); The first deep groove ball bearing (7) and the second deep groove ball bearing (8) are located at both ends inside the housing and are positioned between the main shaft (1) and the housing (3). The first deep groove ball bearing (7) is positioned at one end near the main shaft (1) and is fixed to the housing (3) by the bearing seat (2). The second deep groove ball bearing (8) is positioned at the other end near the main shaft (1) and is fixed to the housing (3) by the bearing stop (4).

2. The space droplet generator according to claim 1, characterized in that: It also includes a first dynamic seal (9) and a second dynamic seal (10); the first dynamic seal (9) and the second dynamic seal (10) are both disposed between the main shaft (1) and the housing (3), the first dynamic seal (9) is located on the side of the annular cavity near the second deep groove ball bearing (8), and the second dynamic seal (10) is located on the side of the annular cavity near the first deep groove ball bearing (7); the first dynamic seal (9) and the second dynamic seal (10) realize the dynamic seal between the main shaft (1) and the housing (3).

3. The space droplet generator according to claim 2, characterized in that: An annular boss is provided on the outer side of the middle part of the main shaft (1), and the second dynamic seal (10) is provided between the annular boss and the housing (3); a bushing (6) is also sleeved on the main shaft (1), and the two ends of the bushing (6) abut against the inner ring of the first deep groove ball bearing (7) and the step surface of the annular boss respectively.

4. The space droplet generator according to claim 3, characterized in that: On the main shaft (1), between the annular boss and the other end, a first boss and a second boss are arranged sequentially from the inside to the outside, and the outer diameter of the second boss is larger than the outer diameter of the first boss; the first dynamic seal (9) is arranged between the first boss and the housing (3), the second deep groove ball bearing (8) is arranged between the second boss and the housing (3), and the liquid storage cavity (112) is located inside the second boss; an annular groove is provided on the inner side of the housing (3), and the inner wall of the annular groove, the outer wall of the end of the annular boss near the other end of the main shaft (1), the outer wall of the main shaft (1), and the outer wall of the end of the second boss near the annular boss constitute the annular cavity; the other end of the working medium channel (111) is located on the stepped surface of the second boss.

5. The space droplet generator according to claim 3, characterized in that: The main shaft (1) and the spray disk (5) are connected by threads; the spray disk (5) is evenly arranged with spray holes, the number of spray holes is 20 to 50, and the diameter of the spray holes is 0.5 to 2 mm.

6. A method for controlling the injection pointing accuracy of a space droplet generator, used in the space droplet generator of claim 1, characterized in that, Includes the following steps: Step 1: Design the space droplet generator according to the design requirements; Step 2: Obtain the axis pointing accuracy θ1 of the main shaft (1) of the space droplet generator, the disk-shaft connection accuracy θ2 between the jet disk (5) and the main shaft (1), and the nozzle pointing accuracy θ3, to obtain the total uncertainty of the jet pointing accuracy of the space droplet generator θ1+θ2+θ 3； Step 3: Define the maximum uncertainty of the jet pointing accuracy of the space droplet generator as θ. max If θ1+θ2+θ3≤θ max If the space droplet generator meets the design requirements, the jet pointing accuracy control of the space droplet generator is achieved; if θ1+θ2+θ3>θ max Then return to step 1 and redesign the space droplet generator until θ1+θ2+θ3≤θ max .

7. The method for controlling the jet pointing accuracy of a space droplet generator according to claim 6, characterized in that, In step 2, the specific method for obtaining the axis pointing accuracy θ1 of the main shaft (1) of the space droplet generator is as follows: Step 21.1: Obtain the maximum machining error δ of the spindle (1) on the first mating surface (11) and the fifth mating surface (15). 17 δ 18 And machining coaxiality β1; wherein, the first mating surface (11) is the mating surface between the main spindle (1) and the first deep groove ball bearing (7); the fifth mating surface (15) is the mating surface between the main spindle (1) and the second deep groove ball bearing (8); Step 21.2: Obtain the maximum machining error δ of the bearing housing (2) on the second mating surface (12) and the third mating surface (13). 27 δ 23 The coaxiality of the machining is β2; the second mating surface (12) is the mating surface between the bearing housing (2) and the first deep groove ball bearing (7); the third mating surface (13) is the mating surface between the bearing housing (2) and the housing (3); Step 21.3: Obtain the maximum machining error δ of the shell (3) on the third mating surface (13) and the fourth mating surface (14). 32 δ 38 And machining coaxiality β3; wherein the fourth mating surface (14) is the mating surface between the housing (3) and the second deep groove ball bearing (8); Step 21.4: Obtain the maximum tolerance δ of the first deep groove ball bearing (7) on the first mating surface (11). 72 The radial runout σ1 on the second mating surface (12); the maximum tolerance δ of the second deep groove ball bearing (8) on the fourth mating surface (14). 83 And the radial runout σ2 on the fifth mating surface (15); Step 21.5, according to the following formula, the axis pointing accuracy θ1 is obtained: θ1=arctan((|δ 17 |+|d 18 |+|d 27 |+|d 23 |+|d 32 |+|d 38 |+|d 72 |+|d 83 |+β1+β2+β3+σ1+σ2) / L) Where L is the distance between the first deep groove ball bearing (7) and the second deep groove ball bearing (8).

8. The method for controlling the jet pointing accuracy of a space droplet generator according to claim 7, characterized in that, In step 2, the specific method for obtaining the disc-shaft connection accuracy θ2 between the injection disc (5) and the main shaft (1) is as follows: Obtain the perpendicularity α1 of the sixth mating surface (16) of the main shaft (1) and the injection disk (5) relative to the fourth mating surface (14), and obtain the disk-shaft connection accuracy θ2=α1.

9. The method for controlling the jet pointing accuracy of a space droplet generator according to claim 8, characterized in that, In step 2, the specific method for obtaining the nozzle pointing accuracy θ3 is as follows: Step 23.1: Obtain the perpendicularity α2 between the nozzle axis on the spray disk (5) and its outer surface, and obtain the angular deviation α2 of the nozzle axis relative to the outer surface of the spray disk (5); Step 23.2, obtain the parallelism deviation u1 between the inner and outer surfaces of the spray disk (5), and obtain the angle deviation u1 between the inner and outer surfaces of the spray disk (5); Step 23.3, according to the following formula, the nozzle pointing accuracy θ3 is obtained: θ3=α2+u1.

10. The method for controlling the jet pointing accuracy of a space droplet generator according to claim 9, characterized in that: In step 3, if θ1 + θ2 + θ3 > θ max If so, return to step 1 and establish the injection accuracy control equation, and recalculate and determine the machining accuracy of the main shaft (1), bearing seat (2), housing (3) and injection disk (5) of the space droplet generator; The injection accuracy control equation is as follows: minf=k1|δ 17 |+k1|d 18 |+k1|d 27 |+k1|d 23 |+k1|d 32 |+k1|d 38 |+K2|β1|+K2|β2|+K2|β3|+k3α1+k3α2+k4u1 Among them, k1 is the difficulty of machining the circular surfaces of the main spindle (1), bearing seat (2), and housing (3); k2 is the difficulty of coaxiality of the main spindle (1), bearing seat (2), and housing (3); k3 is the difficulty of perpendicularity of the spray disc (5); and k4 is the difficulty of parallelism of the spray holes of the spray disc (5).

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