A comprehensive test device for pintle injectors

Abstract

The present application provides a comprehensive test device for a pintle-type injector, comprising: an injector body having a first end and a second end, a pintle barrel being provided inside the injector body, a first cavity being provided inside the pintle barrel, and a plurality of first holes being distributed near the second end; a first inlet being provided near the first end side and communicating with the first cavity; a first measuring assembly for measuring its pressure being provided at the first inlet; a first back pressure portion having a first opening and a second opening being connected to the second end of the injector body, a second cavity being formed between an inner wall of the first back pressure portion and an outer wall of the injector body; a third cavity being formed between an inner wall of the first back pressure portion and an inner wall of the injector body; a second inlet being provided on a side wall of the first back pressure portion and communicating with the second cavity; a first channel being provided in the side wall of the injector body, one end of which is communicated with the second cavity and the other end of which is communicated with the third cavity; a second measuring assembly being provided at the second cavity; and a third measuring assembly being provided on the first channel near the pintle barrel side.

Description

Technical Field

[0001] The present application relates to the field of injection technology, and in particular to a comprehensive testing device for a pintle injector. Background Art

[0002] Pintle injector technology is a relatively advanced technology at this stage. Its greatest advantage is that the acoustic-vibration coupling effect between structures is significantly reduced. Therefore, an effective design verified through a small-thrust engine test can be directly promoted and applied to large engines. By replacing a small number of parts, systematic research and rapid iteration of multiple schemes can be achieved.

[0003] However, at present, there is a lack of test equipment for pintle injectors, and the test equipment is relatively simple and has a complex structure. It is not possible to use the same set of equipment to perform multiple different tests on the injector, which has certain limitations. Summary of the invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, the present application aims to provide a comprehensive test device for a pintle injector, comprising:

[0005] An injector body, wherein the injector body has a first end and a second end along a first direction, a needle bolt barrel is provided inside the injector body near the second end, the needle bolt barrel extends in the first direction, a first cavity is provided inside the needle bolt barrel, a plurality of first holes are arranged in an array on a side wall of the needle bolt barrel near the second end, an axial direction of the first hole is a radial direction of the needle bolt barrel, and an end of the needle bolt barrel near the second end is sealed;

[0006] a first inlet, the first inlet being disposed on the injector body close to the first end side, the first inlet being communicated with the first cavity;

[0007] a first measuring component, the first measuring component is disposed at the first inlet, and the first measuring component is used to measure the fluid pressure in the first inlet;

[0008] A first back pressure portion, wherein the first back pressure portion is provided with a first opening and a second opening along the first direction, the first opening is connected to the end of the injector body close to the second end, a second cavity is formed between the inner wall of the first back pressure portion and the outer wall of the injector body; a third cavity is formed between the inner wall of the first back pressure portion and the inner wall of the injector body, and the first hole is connected to the third cavity;

[0009] a second inlet, the second inlet being disposed on a side wall of the first back pressure portion, the second inlet being communicated with the second cavity;

[0010] A first channel, wherein the first channel is disposed in a side wall of the injector body, one end of the first channel is connected to the second cavity, and the other end of the first channel is connected to the third cavity;

[0011] a second measuring component, the second measuring component being disposed at the second cavity and being used to measure the fluid pressure in the second cavity;

[0012] A third measuring component is arranged at the first channel near the needle plug barrel side and is used to measure the fluid pressure at the end of the first channel.

[0013] According to the technical solution provided in the embodiment of the present application, it also includes a first connecting part, which is used to connect the first back pressure part and the injector body; the first connecting part includes two inferior arc-shaped first connecting components, the openings of the two first connecting components are arranged opposite to each other, and a first space is provided at the ends close to each other of the two first connecting components, and the first space is used to set the second inlet.

[0014] According to the technical solution provided in the embodiment of the present application, the injector body portion placed in the second cavity is provided with a first outlet, and the first outlet is connected to the third cavity.

[0015] According to the technical solution provided in the embodiment of the present application, the second opening is sealed with a second back pressure portion, the second back pressure portion has a fourth cavity therein, and the fourth cavity is connected to the third cavity.

[0016] According to the technical solution provided in the embodiment of the present application, a fourth measuring component is provided on the first back pressure portion, and the fourth measuring component is used to measure the pressure in the third cavity and the fourth cavity.

[0017] The technical solution provided in the embodiment of the present application also includes:

[0018] a third inlet, the third inlet being arranged at the second back pressure portion away from the second opening end, the third inlet being used for filling and discharging fluid into the third cavity and the fourth cavity;

[0019] a fourth inlet, the fourth inlet being disposed on the injector body close to the first end side, the fourth inlet being communicated with the first cavity;

[0020] A first discharge port is provided on the injector body close to the first end side, and the first discharge port is used to discharge the gas in the first cavity.

[0021] According to the technical solution provided in the embodiment of the present application, a sealing assembly is provided in the second cavity, and the sealing assembly is used to prevent the fluid in the second cavity from flowing out from the connection between the first back pressure part and the injector body.

[0022] According to the technical solution provided in the embodiment of the present application, it also includes a second connecting part, which is used to connect the first back pressure part and the second back pressure part, and the second connecting part includes a second left end flange and a second right end flange distributed along the first direction.

[0023] According to the technical solution provided in the embodiment of the present application, a pressure ring is provided at the end of the first connecting portion away from the first back pressure portion.

[0024] In summary, the present application proposes a comprehensive test device for a pintle-type injector, wherein the injector body having a first end and a second end has a pintle barrel with closed ends inside, a plurality of first holes are provided on the side wall of the pintle barrel near the second end, a first cavity is provided inside the pintle barrel, the injector body is also provided with a first inlet connected to the first cavity, and a first measuring component provided on the first inlet for measuring the pressure of the fluid inside the first inlet; by connecting a first back pressure portion at the second end, the first back pressure portion and the outer wall of the injector body form a second cavity, the inner walls of the two form a third cavity connected to the first hole, the first back pressure portion is provided with a second inlet connected to the second cavity, a first channel is provided in the side wall of the injector body, one end of the first channel is connected to the second cavity, and the other end of the first channel is connected to the third cavity, and the second A second measuring component for measuring the internal fluid pressure is provided in the cavity, and a third measuring component for measuring the internal fluid pressure is provided at the end of the first channel; when in use, an oxidant is introduced into the injector body through the first inlet, and during testing, clean water is introduced through the first inlet, and the clean water is sprayed from the first hole to the inner wall of the injector body. The first measuring component can measure the clean water pressure at the first inlet, thereby completing the liquid flow test of the injector oxidant circuit; when in use, the first channel is the fuel channel of the injector. During testing, clean water is introduced into the second cavity through the second inlet, and the clean water flows into the third cavity through the first channel. The second measuring component measures the inlet pressure of the fluid, and the third measuring component measures the pre-injection pressure of the fluid, thereby obtaining the flow resistance and completing the liquid flow test of the injector fuel circuit.

[0025] This solution can complete the liquid flow test of the injector oxidant circuit and the fuel circuit without back pressure, thereby improving the applicability of the test device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of a comprehensive test device for a pintle injector provided in an embodiment of the present application;

[0027] Figure 2 for Figure 1 A partial enlarged view of A;

[0028] Figure 3 A left-side structural schematic diagram of a comprehensive testing device for a pintle injector provided in an embodiment of the present application.

[0029] The text annotations in the figure represent:

[0030] 1. Injector body; 11. Second end; 12. First protrusion; 13. First channel; 2. Pintle cylinder; 21. First cavity; 22. First hole; 3. First inlet; 4. First back pressure portion; 41. Second cavity; 411. Radial seal; 412. End face seal; 42. Third cavity; 43. First connecting edge; 44. Second protrusion; 45. Second inlet; 46. Second measuring assembly; 47. Third measuring assembly; 48. Fourth measuring assembly; 5. First connecting assembly; 51. First left end flange; 52. First right end flange; 6. Second back pressure portion; 61. Fourth cavity; 62. Third inlet; 7. Second connecting portion; 71. Second left end flange; 72. Second right end flange; 8. Fourth inlet; 9. Press ring. DETAILED DESCRIPTION

[0031] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0032] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0033] Example 1

[0034] As mentioned in the background technology, in view of the problems in the prior art, this application proposes a comprehensive test device for a pintle injector, such as Figure 1 , Figure 2 and Figure 3 As shown, including:

[0035] An injector body 1, wherein the injector body 1 has a first end and a second end 11 along a first direction, a needle bolt barrel 2 is provided inside the injector body near the second end 11, the extension direction of the needle bolt barrel 2 is the first direction, the needle bolt barrel 2 has a first cavity 21 inside, a plurality of first holes 22 are arranged in an array on the side wall of the needle bolt barrel 2 near the second end 11, the axial direction of the first hole 22 is the radial direction of the needle bolt barrel 2, and the end of the needle bolt barrel 2 near the second end 11 is sealed; optionally, the shape of the comprehensive test device is a hollow cylinder, and the first direction is the extension direction of the axis of the comprehensive test device when it is lying down;

[0036] a first inlet 3, the first inlet 3 being arranged at the injector body 1 near the first end side, the first inlet 3 being communicated with the first cavity 21; wherein, when the injector body 1 is used, an oxidant is introduced through the first inlet 3, during a test, the oxidant path is measured by clean water, a rated flow of clean water is introduced through the first inlet 3, the clean water enters the first cavity 21 through the first inlet 3, and is sprayed from the first hole 22 of the needle plug barrel 2 to the inner wall of the injector body 1;

[0037] A first measuring component, which is disposed at the first inlet 3 and is used to measure the fluid pressure in the first inlet 3; optionally, the first measuring component is a pressure sensor, and when the oxidant path is tested, the pressure sensor is installed at the first outlet to judge the flow condition of the first hole 22 by the pressure;

[0038] A first back pressure portion 4, wherein the first back pressure portion 4 is provided with a first opening and a second opening along the first direction, the first opening is connected to the end of the injector body 1 close to the second end 11, and a second cavity 41 is formed between the inner wall of the first back pressure portion 4 and the outer wall of the injector body 1; the inner wall of the first back pressure portion 4 and the inner wall of the injector body 1 form a third cavity 42, and the first hole 22 is connected to the third cavity 42; specifically, a circle of first protrusions 12 is provided on the outer wall of the injector body 1 close to the second end 11, and a circle of first connecting edges 43 are provided outwardly along the second direction at the first opening end of the first back pressure portion 4; the second direction is perpendicular to the first direction, and the first connecting edge 43 extends outwardly along the first direction away from the second opening end with a circle of second protrusions 44; after the injector body 1 and the first back pressure portion 4 are assembled, the second protrusion 44 is sealed and connected to the end of the first protrusion 12 away from the third cavity 42, and the first connecting edge 43 is sealed and connected to the second end 11, forming an annular second cavity 41;

[0039] A second inlet 45, which is disposed on the side wall of the first back pressure portion 4, and is communicated with the second cavity 41; wherein a DN16 filler nozzle is welded at the end of the second inlet 45 away from the second cavity 41, and the filler nozzle is a concave step nozzle;

[0040] a first channel 13, the first channel 13 being arranged in the side wall of the injector body 1, one end of the first channel 13 being in communication with the second cavity 41, and the other end being in communication with the third cavity 42; when the injector body 1 is in use, fuel is introduced into the first channel 13, during a test, the first inlet 3 is blocked, clean water is introduced into the second cavity 41 through the nozzle of the second inlet 45, a first through hole is arranged at the second end 11 of the injector body 1 placed in the second cavity 41, clean water flows into the first channel 13 through the first through hole, and then flows into the third cavity 42 from the first channel 13;

[0041] A second measuring component 46, which is disposed at the second cavity 41 and is used to measure the fluid pressure in the second cavity 41; wherein the second measuring component 46 is a pressure sensor;

[0042] The third measuring assembly 47 is arranged at the first channel 13 near the needle barrel 2 and is used to measure the fluid pressure at the end of the first channel 13; wherein the third measuring assembly 47 is a pressure sensor. Since the flow passage of the first channel 13 is narrow, the fluid pressure will change after passing through the first channel 13. Therefore, the flow resistance can be obtained by the pressure difference measured by the second measuring assembly 46 and the third measuring assembly 47, thereby completing the liquid flow test of the injector fuel path;

[0043] Therefore, the present application can simultaneously complete the liquid flow test of the oxidant circuit and the fuel circuit of the injector, thereby improving the applicability of the test device.

[0044] Furthermore, it also includes a first connecting portion, which is used to connect the first back pressure portion 4 and the injector body 1; the first connecting portion includes two inferior arc-shaped first connecting components 5, the openings of the two first connecting components 5 are arranged opposite to each other, and the two first connecting components 5 are provided with a first space at the ends close to each other, and the first space is used to set the second inlet 45; wherein, the first connecting component 5 includes a first left end flange 51 sleeved on the outside of the injector body and a first right end flange 52 sleeved on the outside of the first back pressure portion 4, and the first left end flange 51 is provided on the first convex The first back pressure portion 4 is far away from the first back pressure portion 4, the inner wall of the first left end flange 51 is fixedly connected to the injector body 1, the first right end flange 52 is connected to the first connecting edge 43 of the first back pressure portion 4, and can also be integrally formed with the first connecting edge 43, the first left end flange 51 and the first right end flange 52 are provided with a plurality of corresponding threaded holes distributed along an array, and the axial direction of the threaded hole is parallel to the first direction, so the bolt passes through the threaded hole and is fixed by a nut to realize the fixed connection between the injector body 1 and the first back pressure portion 4;

[0045] Since two first spaces are formed between the two first connecting components 5, two second inlets 45 are provided in the two first spaces. By welding a DN16 filler nozzle at the two second inlets 45, a concave step seal is provided at the filler nozzle away from the second inlet end, so that clean water is introduced into the second cavity 41 through the filler nozzle.

[0046] Further, the injector body 1 part placed in the second cavity 41 is provided with a first outlet, and the first outlet is connected to the third cavity 42; wherein, specifically, the first outlet is arranged near the second end 11 of the injector body 1, and is a second through hole opened near the second end 11. After the liquid flow test of the fuel path and the oxidant path is completed, the size of the second through hole can be determined. After the second through hole is processed, when the injector body 1 and the first back pressure part 4 are assembled, an O-type rubber sealing ring is installed on the side of the first channel 13 near the third cavity 42 to block the first channel 13. In normal use, cooling water is introduced into the second through hole. During the test, clean water with a rated flow rate is introduced from the two second inlets 45. The first inlet 3 is blocked, and the clean water enters the second cavity 41. Since the first channel 13 is blocked, the clean water flows into the third cavity 42 from the second through hole, and its pressure is measured by the second measuring component 46 to complete the liquid flow test of the cooling path.

[0047] Furthermore, a sealing assembly is provided in the second cavity 41, and the sealing assembly is used to prevent the fluid in the second cavity 41 from flowing out from the connection between the first back pressure portion 4 and the injector body 1; wherein the sealing assembly includes a radial seal 411 and an end face seal 412, the radial seal 411 is provided between the top end of the first protrusion 12 away from the injector body 1 and the bottom end of the second protrusion 44 close to the injector body 1, and the end face seal 412 is provided between the end face of the second end 11 of the injector body 1 and the end face of the first connecting edge 43 close to the injector body 1, and the sealing assembly enables the clean water in the second cavity 41 to flow out only from the first through hole and the second through hole.

[0048] Example 2

[0049] On the basis of Example 1, further, Figure 1 and Figure 3 As shown, the second opening is sealed with a second back pressure portion 6, and the second back pressure portion 6 has a fourth cavity 61 therein, and the fourth cavity 61 is connected to the third cavity 42; specifically, the second back pressure portion 6 is a hollow cylinder, one end of which has a third opening, and its inner diameter is the same as the inner diameter of the second back pressure portion 4. When assembled, the second back pressure portion 6 and the first back pressure portion 4 are coaxially placed, the third opening is sealed with the second opening, and the end of the second back pressure portion 6 away from the first back pressure portion 4 is closed; after the second back pressure portion 6 is assembled, the liquid flow test of the oxidant path and the fuel path is performed again, and the entire device is in a back pressure state at this time.

[0050] Furthermore, a fourth measuring component 48 is provided on the first back pressure portion 4, and the fourth measuring component 48 is used to measure the pressure in the third cavity 42 and the fourth cavity 61; optionally, the fourth measuring component 48 is also a pressure sensor, so the present device can simultaneously perform oxidant path flow tests, fuel path tests, and cooling path tests in both non-back pressure states and back pressure states, thereby greatly improving the applicability of the present device.

[0051] Furthermore, it also includes a second connecting part 7, which is used to connect the first back pressure part 4 and the second back pressure part 6, and the second connecting part 7 includes a second left end flange 71 and a second right end flange 72 distributed along the first direction; optionally, the second left end flange 71 is sleeved on the second open end of the first back pressure part 4, and its inner wall is welded to the outer wall of the first back pressure part 71, or the second left end flange 71 is the second open end of the first back pressure part 4. A circle of second connecting edges is provided outwardly along the second direction; optionally, the second right end flange 72 is sleeved on the third open end of the second back pressure part 6, and its inner wall is welded to the outer wall of the second back pressure part 6, or the second right end flange 72 is the third open end of the second back pressure part 6. A plurality of threaded holes are arranged in an array on the second left end flange 71 and the second right end flange 72, and the two are connected by bolts.

[0052] Furthermore, it also includes:

[0053] A third inlet 62, the third inlet 62 is arranged at the second back pressure portion 6 away from the second opening end, the third inlet 62 is used to charge and discharge fluid into the third cavity 42 and the fourth cavity 61; wherein, a DN32 straight-through nozzle is welded at the end of the third inlet 62; and a concave step seal is provided at the end of the nozzle away from the second back pressure portion 6;

[0054] a fourth inlet 8, the fourth inlet 8 being disposed on the injector body 1 close to the first end side, the fourth inlet 8 being communicated with the first cavity 21;

[0055] The first row of ports is arranged on the injector body 1 near the first end side, and the first row of ports is used to discharge the gas in the first cavity 21; the device can also be subjected to hydraulic and airtight tests. During the hydraulic test, the first inlet 3 and the second inlet 45 are blocked, and clean water is introduced from the third inlet 62. After the third cavity 42 and the fourth cavity 61 are filled with clean water, the nozzle of the third inlet 62 is blocked; the whole device is erected so that the axial direction of the first back pressure part 4 is in the vertical direction, and a pressure test pump is sealed and connected to the fourth inlet 8. During the test, clean water is introduced into the first cavity 21 through the pressure test pump, and the residual gas in the cavity is discharged from the first row of ports; in certain specific scenarios, the pressure resistance of the injector is 10MPa, and a safety factor of 1.5 times is set. Clean water is introduced into the cavity through the pressure test pump. When the pressure reaches 15MPa, if the injector body 1 does not have defects such as leakage and deformation, it proves that the product strength meets the requirements;

[0056] Furthermore, the nozzle of the third inlet 62 is opened to allow the clean water in the cavity to flow out, and an air pump is connected to the fourth inlet 8 to pass gas into the light body. After the inside of the cavity is dried, the nozzle of the third inlet 62 is sealed again, and gas is continued to be passed into the cavity from the fourth inlet 8. The pressure indication of the air pump is used to determine whether there is any leakage inside the injector body 1 to check its air tightness.

[0057] Furthermore, a pressure ring 9 is provided at the end of the first connecting portion away from the first back pressure portion 4; wherein, since the injector body 1 and the first back pressure portion 4 are connected via the first connecting portion, and the first connecting portion is connected by two inferior arc-shaped first connecting components 5, the two first connecting components 5 are not directly connected, and when testing under the back pressure state, if the inner cavity pressure is too large and the force of the two first connecting components 5 is insufficient, the inner cavity pressure will push up the injector body 1; the pressure ring 9 is sleeved on the outside of the injector body 1, and optionally, it is fixed to the two first connecting components 5 by screwing, and the pressure ring 9 clamps the injector body 1 to prevent the injector body 1 from detaching.

[0058] Therefore, in summary, the device can perform liquid flow tests on the oxidizer circuit and the fuel circuit under back pressure and no back pressure conditions, and can also perform hydraulic tests and air tightness tests. Multiple tests of the injector can be completed by one device, which reduces the test cost, saves the test time, and greatly improves the test efficiency.

[0059] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and its core ideas of this application. The above is only the preferred implementation method of this application. It should be pointed out that due to the limitations of textual expression and the objective existence of infinite specific structures, ordinary technicians in this technical field can make several improvements, modifications or changes without departing from the principles of the present invention, and can also combine the above technical features in an appropriate manner; these improvements, modifications, changes or combinations, or the direct application of the inventive concept and technical solution to other occasions without improvement, should be regarded as the scope of protection of this application.

Claims

1. A comprehensive test device for a pintle injector, characterized in that: include: An injector body (1), the injector body (1) having a first end and a second end (11) along a first direction, a needle bolt barrel (2) being provided inside the injector body (1) near the second end (11), the needle bolt barrel (2) extending in the first direction, the needle bolt barrel (2) having a first cavity (21) inside, a plurality of first holes (22) being arranged in an array on a side wall of the needle bolt barrel (2) near the second end (11), the axial direction of the first hole (22) being in a radial direction of the needle bolt barrel (2), and the end of the needle bolt barrel (2) near the second end (11) being sealed; a first inlet (3), the first inlet (3) being arranged on the injector body (1) close to the first end side, the first inlet (3) being in communication with the first cavity (21); a first measuring component, the first measuring component being arranged at the first inlet (3), and the first measuring component being used to measure the fluid pressure in the first inlet (3); a first back pressure portion (4), the first back pressure portion (4) being provided with a first opening and a second opening along the first direction, the first opening being connected to an end portion of the injector body (1) close to the second end (11), a second cavity (41) being formed between an inner wall of the first back pressure portion (4) and an outer wall of the injector body (1); a third cavity (42) being formed between an inner wall of the first back pressure portion (4) and an inner wall of the injector body (1), the first hole (22) being in communication with the third cavity (42); a second inlet (45), the second inlet (45) being arranged on a side wall of the first back pressure portion (4), the second inlet (45) being in communication with the second cavity (41); a first channel (13), the first channel (13) being arranged in a side wall of the injector body (1), one end of the first channel (13) being in communication with the second cavity (41), and the other end of the first channel (13) being in communication with the third cavity (42); a second measuring component (46), the second measuring component (46) being arranged at the second cavity (41) and being used to measure the fluid pressure in the second cavity (41); A third measuring component (47), the third measuring component (47) being arranged on the side of the first channel (13) close to the needle plug barrel (2) and used for measuring the fluid pressure at the end of the first channel (13); further comprising a first connecting portion, the first connecting portion being used for connecting the first back pressure portion and the injector body (1); the first connecting portion comprising two inferior arc-shaped first connecting components (5), the openings of the two first connecting components (5) being arranged opposite to each other, a first space being provided at the ends of the two first connecting components (5) close to each other, the first space being used for arranging the second inlet (45); a portion of the injector body (1) disposed in the second cavity (41) being provided with a first outlet, the first outlet being communicated with the third cavity (42); a second back pressure portion (6) being sealedly connected to the second opening, the second back pressure portion (6) having a fourth cavity (61) therein, the fourth cavity (61) being communicated with the third cavity (42).

2. The comprehensive testing device for the pintle injector according to claim 1, characterized in that: A fourth measuring component (48) is provided on the first back pressure portion (4), and the fourth measuring component (48) is used to measure the pressure in the third cavity (42) and the fourth cavity (61).

3. The comprehensive testing device for the pintle injector according to claim 1, characterized in that: Also includes: a third inlet (62), the third inlet (62) being arranged at the second back pressure portion (6) away from the second opening end, the third inlet (62) being used for filling and discharging fluid into the third cavity (42) and the fourth cavity (61); a fourth inlet (8), the fourth inlet (8) being arranged on the injector body (1) close to the first end side, the fourth inlet (8) being in communication with the first cavity (21); A first discharge port, wherein the first discharge port is arranged on the injector body (1) close to the first end side, and the first discharge port is used to discharge the gas in the first cavity (21).

4. The comprehensive testing device for the pintle injector according to claim 1, characterized in that: A sealing component is provided in the second cavity (41), and the sealing component is used to prevent the fluid in the second cavity (41) from flowing out from the connection between the first back pressure portion (4) and the injector body (1).

5. The comprehensive testing device for the pintle injector according to claim 1, characterized in that: It also comprises a second connecting portion (7), the second connecting portion (7) being used to connect the first back pressure portion (4) and the second back pressure portion (6), the second connecting portion (7) comprising a second left end flange (71) and a second right end flange (72) distributed along the first direction.

6. The comprehensive testing device for the pintle injector according to claim 1, characterized in that: A pressure ring (9) is provided at the end of the first connecting portion away from the first back pressure portion (4).

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