CN210719539U

CN210719539U - Small-size solid engine thin wall casing sub-assembly water pressure test fixture

Info

Publication number: CN210719539U
Application number: CN201921475621.XU
Authority: CN
Inventors: 沈勇军; 陈伟; 彭炬; 常文辰
Original assignee: Shenzhen Zero One Space Electronics Co ltd; Chongqing One Space Aerospace Technology Co Ltd; Beijing Zero One Space Technology Research Institute Co Ltd; Chongqing Zero One Space Technology Group Co Ltd; Xian Zero One Space Technology Co Ltd
Current assignee: Chongqing One Space Aerospace Technology Co Ltd; Beijing Zero One Space Electronics Co Ltd; Beijing Zero One Space Technology Research Institute Co Ltd; Chongqing Zero One Space Technology Group Co Ltd; Xian Zero One Space Technology Co Ltd
Priority date: 2019-09-06
Filing date: 2019-09-06
Publication date: 2020-06-09
Anticipated expiration: 2029-09-06

Abstract

The utility model discloses a small-size solid engine thin wall casing sub-assembly water pressure test fixture, including the frock body, the frock body includes water installations, connection structure and base, water installations's lower extreme pass through the screw thread with connection structure connects, connection structure's lower extreme is placed in the ring channel of the upper end of base, connection structure's bottom has engine thin wall casing through threaded connection. The test tool is simple in structure and high in universality, connecting structure threads can be replaced according to different engine sizes, and the requirement of engine water pressure test of various shapes and characteristics is met. The actual working environment of the engine can be simulated really, and the strength of each part (shell and spray pipe) of the engine and the deformation and the sealing performance of a connecting part are verified systematically; the method for processing the throat diameter and the expansion section by water pressure firstly can ensure the precision of the inner profile of the throat diameter and the expansion section and the precision of the mounting matching surface of the metal shell and the graphite throat liner.

Description

Small-size solid engine thin wall casing sub-assembly water pressure test fixture

Technical Field

The utility model relates to a small-size solid engine production field, concretely relates to small-size solid engine thin wall casing sub-assembly water pressure test fixture.

Background

The existing small-sized solid engine thin-wall shell hydrostatic test is that the hydraulic test is respectively carried out after the processing of the component assemblies, the pressure-bearing capacity is verified, the sealing performance of the joint is guaranteed through a sealing ring or a sealing glue during the installation, but the deformation and other conditions caused by the moment effect cannot be predicted for the stress condition of the threads of the joint.

The situation of sealing failure caused by deformation of the joint in the use process is avoided by improving the safety margin in the design process, but for some engines with insufficient space or other requirements on safety margin, the joint or the shell deforms under the action of torque, so that safety accidents can be caused by sealing failure of the joint, and the strength of the engine and the sealing property of the joint need to be checked through a hydraulic test after production is completed.

Disclosure of Invention

In view of the above defects or shortcomings in the prior art, it is desirable to provide a water pressure testing tool for a thin-wall shell assembly of a small solid engine, which can simulate the real working environment of the engine and has strong universality.

According to the technical scheme provided by the embodiment of the application, the water pressure testing tool for the thin-wall shell assembly of the small-sized solid engine comprises a tool body, the tool body comprises a water inlet device, a connecting structure and a base, the lower end of the water inlet device is connected with the connecting structure through threads, the lower end of the connecting structure is placed in an annular groove at the upper end of the base, the bottom of the connecting structure is connected with an engine thin-wall shell through threads, the thin-wall shell of the engine comprises a shell, a spray pipe, a mechanical interface and a sealing groove, wherein one end of the spray pipe is provided with a convergent section, the other end of the spray pipe is provided with an expansion section, the front end of the shell is axially arranged in the convergent section of the spray pipe, the expansion section of the spray pipe is provided with the mechanical interface, the sealing groove is formed in the inner side of the mechanical interface, and the thin-wall shell of the engine is placed in the base.

The utility model discloses in, water installations's upper portion is the toper, and the lower part is cylindrically, water installations's upper end is equipped with the water inlet.

The utility model discloses in, water installations's bottom central authorities are equipped with decurrent water guide nozzle, mechanical interface with water guide nozzle outside is through threaded connection, water guide nozzle's lower extreme with the junction of spray tube is sealed through the seal groove.

The utility model discloses in, vertical the placing of engine thin wall casing is in the base, the upper end of spray tube with connection structure's bottom department of meeting, the lower extreme of casing with the bottom of base is contacted.

The utility model discloses in, water installations and connection structure's junction is sealed through O type circle.

The utility model discloses in, the junction of connection structure and engine thin wall casing passes through the rubber pad and seals.

The utility model discloses in, the junction of casing and spray tube is sealed through one of sealing washer and detachable sealed glue.

To sum up, the beneficial effect of this application:

1. the test tool is simple in structure and high in universality, connecting structure threads can be replaced according to different engine sizes, and the requirement of engine water pressure test of various shapes and characteristics is met. Meanwhile, the test engine shell is placed in the base, so that the safety of a test site can be ensured, and flying objects are prevented;

2. compared with the traditional small solid engine water pressure measuring method, the test tool can simulate the actual working environment of the engine more truly, and verify the strength of each part (shell and spray pipe) of the engine and the deformation and the sealing performance of the joint of the engine and the spray pipe systematically;

2. for metal materials, particularly metal materials with low mechanical properties such as aluminum alloy and the like, plastic deformation can occur in the hydraulic test process, so that the deviation of the throat diameter and the inner profile dimension of the spray pipe from the design state is caused, the performance of an engine is greatly influenced, the throat diameter and the expansion section are firstly processed by hydraulic pressure, and the accuracy of the throat diameter and the inner profile of the expansion section can be ensured. The spray pipe adopting the graphite throat insert can ensure the precision of the mounting matching surface of the metal shell and the graphite throat insert.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:

fig. 1 is a schematic view of the overall structure of the present invention;

fig. 2 is a schematic structural view of the tool body of the present invention;

FIG. 3 is a perspective view of the middle tooling body of the present invention

FIG. 4 is a schematic structural diagram of a thin-walled engine case according to the present invention;

fig. 5 is a schematic structural diagram of an embodiment of the present invention.

Reference numbers in the figures: a shell-1; a spray pipe-2; a mechanical interface-3; a sealing groove-4; an expansion section inner profile-5; a water inlet device-6; connecting structure-7; a base-8.

Detailed Description

The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and are not limiting of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.

Referring to fig. 1 and 4, a water pressure testing tool for a thin-wall shell assembly of a small solid engine comprises a tool body, wherein the tool body comprises a water inlet device 6, a connecting structure 7 and a base 8, the lower end of the water inlet device 6 is connected with the connecting structure 7 through threads, the lower end of the connecting structure 7 is placed in an annular groove at the upper end of the base 8, the bottom of the connecting structure 7 is connected with the thin-wall shell of the engine through threads, the thin-wall shell of the engine comprises a shell 1, a spray pipe 2, a mechanical interface 3 and a sealing groove 4, one end of the spray pipe 2 is provided with a convergent section, the other end of the spray pipe 2 is provided with an expansion section, the front end of the shell 1 is axially installed inside the convergent section of the spray pipe 2, the expansion section of the spray pipe 2 is provided with the mechanical interface 3, and the, the engine thin-walled casing is placed in the bedplate 8. The upper portion of water installations 6 is the toper, and the lower part is cylindrical, the upper end of water installations 6 is equipped with the water inlet. The bottom center of water installations 6 is equipped with decurrent water guide nozzle, mechanical interface 3 with the water guide nozzle outside is through threaded connection, the lower extreme of water guide nozzle with the junction of spray tube 2 is sealed through seal groove 4. The thin-wall shell of the engine is vertically placed in the base 8, the upper end of the spray pipe 2 is connected with the bottom of the connecting structure 7, and the lower end of the shell 1 is in contact with the bottom of the base 8. The joint of the water inlet device 6 and the connecting structure 7 is sealed by an O-shaped ring. The joint of the connecting structure 7 and the thin-wall shell of the engine is sealed by a rubber pad. The joint of the shell 1 and the spray pipe 2 is sealed by one of a sealing ring and a detachable sealant.

In the embodiment, as shown in fig. 4, during the operation of the engine, the convergent section of the combustion chamber housing 1 and the nozzle 2 bears a large pressure inside the engine during combustion, and the divergent section of the nozzle 2 bears a small pressure, so the hydraulic test mainly examines the bearing condition of the inner walls of the combustion chamber and the nozzle 2 to the pressure and the sealing condition of the joint, and the divergent section bears a small pressure. After the shell 1 is connected with the spray pipe 2, the water pressure test is completed by flushing water through the interface of the expansion section of the spray pipe 2, and the strength, the strain and the sealing performance of the connection part of the shell 1 and the spray pipe 2 are examined. As shown in fig. 5, after the hydraulic test is completed, the nozzle is removed, and the expansion section profile 5 is processed.

As shown in fig. 2, the water inlet device 6 is used for introducing water into the tool device, and further introducing the water into the thin-wall shell of the engine; the connecting structure 7 is used for connecting the water inlet device 6 with the thin-wall shell of the engine; the base 8 is used for placing the connected engine shell and ensuring the safety of a test site; the water inlet device 6 is connected with the connecting structure 7 through threads and sealed by adopting an O-shaped ring; the connecting structure 7 is connected with the thin-wall shell of the engine through threads and sealed through a rubber pad; the connecting structure 7 is placed in an annular groove of the base 8 without sealing;

the foregoing description is only exemplary of the preferred embodiments of the application and is provided for the purpose of illustrating the general principles of the technology and the like. Meanwhile, the scope of the present invention is not limited to the specific combinations of the above-described technical features, and other technical features that are arbitrarily combined with each other or equivalent features may be included without departing from the scope of the present invention. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims

1. The utility model provides a small-size solid engine thin wall casing sub-assembly water pressure test fixture, includes the frock body, characterized by: the tool body comprises a water inlet device (6), a connecting structure (7) and a base (8), the lower end of the water inlet device (6) is connected with the connecting structure (7) through threads, the lower end of the connecting structure (7) is placed in an annular groove at the upper end of the base (8), the bottom of the connecting structure (7) is connected with an engine thin-wall shell through threads, the engine thin-wall shell comprises a shell (1), a spray pipe (2), a mechanical interface (3) and a sealing groove (4), one end of the spray pipe (2) is provided with a convergent section, the other end is provided with an expansion section, the front end of the shell (1) is axially arranged in the convergent section of the spray pipe (2), the mechanical interface (3) is arranged at the expansion section of the spray pipe (2), the sealing groove (4) is arranged on the inner side of the mechanical interface (3), and the thin-wall shell of the engine is placed in the base (8).

2. The hydraulic pressure test tool for the thin-wall shell assembly of the small solid engine as claimed in claim 1, which is characterized in that: the upper portion of water installations (6) is the toper, and the lower part is cylindrical, the upper end of water installations (6) is equipped with the water inlet.

3. The hydraulic pressure test tool for the thin-wall shell assembly of the small solid engine as claimed in claim 1, which is characterized in that: the bottom center of water installations (6) is equipped with decurrent water guide nozzle, mechanical interface (3) with the outside threaded connection that passes through of water guide nozzle, the lower extreme of water guide nozzle with the junction of spray tube (2) is sealed through seal groove (4).

4. The hydraulic pressure test tool for the thin-wall shell assembly of the small solid engine as claimed in claim 1, which is characterized in that: the thin-wall shell of the engine is vertically placed in the base (8), the upper end of the spray pipe (2) is in contact with the bottom of the connecting structure (7), and the lower end of the shell (1) is in contact with the bottom of the base (8).

5. The hydraulic pressure test tool for the thin-wall shell assembly of the small solid engine as claimed in claim 1, which is characterized in that: the connection part of the water inlet device (6) and the connecting structure (7) is sealed by an O-shaped ring.

6. The hydraulic pressure test tool for the thin-wall shell assembly of the small solid engine as claimed in claim 1, which is characterized in that: the connecting part of the connecting structure (7) and the thin-wall shell of the engine is sealed by a rubber pad.

7. The hydraulic pressure test tool for the thin-wall shell assembly of the small solid engine as claimed in claim 1, which is characterized in that: the joint of the shell (1) and the spray pipe (2) is sealed by one of a sealing ring and a detachable sealant.