Air tightness detection equipment

Abstract

The air tightness detection device comprises a supporting seat, an abutting groove, a telescopic piece and a plurality of pulling arms, a groove opening of the abutting groove deviates from the supporting seat, the telescopic piece is arranged in the middle of the supporting seat, the telescopic end of the telescopic piece is rotatably connected with the middle of the bottom of the abutting groove, and the side wall of the abutting groove is provided with an air-entrapping opening communicated with the interior of the abutting groove. The plurality of pulling arms are distributed on the periphery of the abutting groove at intervals in the circumferential direction, one end of each pulling arm is rotationally connected with the edge of the supporting seat, the other end of each pulling arm is provided with a hook part, and the plurality of pulling arms can swing until the hook parts are close to or far away from each other, so that the notch of the abutting groove can be in butt joint with the interface of the to-be-detected equipment; the hook parts of the plurality of pulling arms are all connected with the edge of the interface of the to-be-detected equipment in a hanging mode, then the telescopic piece drives the abutting groove to move until the notch of the abutting groove abuts against the interface of the to-be-detected equipment in a sealed mode, and then gas is introduced into the abutting groove through the gas adding opening so as to carry out gas tightness detection on the to-be-detected equipment.

Description

Technical Field

[0001] The utility model belongs to the field of airtightness detection equipment, and particularly relates to an airtightness detection equipment capable of detecting the airtightness of a rocket engine. Background Art

[0002] The seal of a rocket engine plays a very crucial role in the normal operation of the rocket engine. If the seal is not good, during the test run or flight of the rocket engine, component burnout or even explosion may occur due to gas leakage. After the engine is assembled and before ignition, an airtightness detection test is usually carried out according to the process requirements. The method is to install a sealing plug or a special sealing device at the air inlet and outlet (also called the nozzle and exhaust pipe) of the engine for plugging. At the same time, an inflation interface is provided on the sealing device of the nozzle and exhaust pipe, and then a gas (nitrogen or helium) with a certain pressure is filled into the rocket engine. After maintaining the pressure for a certain time, the pressure drop in the inner cavity of the engine is measured, or a special instrument (such as helium leak detection) is used to detect the parts of the engine that may have air leakage, and it is determined whether the requirements are met through the detection value. However, due to the different structures and sizes of the air outlets of the rocket engines produced by various manufacturers, the sealing methods adopted are also different. For example, some use a sealing plug for sealing, and a connecting nozzle is welded on the sealing plug for inflating the inner cavity of the engine. Its disadvantage is that the operation of sealing and installing the sealing plug on the nozzle and exhaust pipe is complex, and the efficiency is low during disassembly and assembly. Content of the Utility Model

[0003] In order to solve the above technical problems, the purpose of the utility model is to provide an airtightness detection equipment with a simple structure, convenient disassembly and assembly, and good sealing effect.

[0004] In order to achieve the above purpose, the technical solution of the utility model is as follows: An airtightness detection equipment includes a support seat, an abutting groove, a telescopic member, and a plurality of pulling arms. The support seat and the abutting groove are arranged at intervals, and the notch of the abutting groove faces away from the support seat. The telescopic member is arranged in the middle of the support seat, and its telescopic end is rotatably connected to the middle of the bottom of the abutting groove. An air inlet is provided on the side wall of the abutting groove and is communicated with the inside of the groove. The plurality of pulling arms are circumferentially arranged at intervals around the abutting groove. One end of each pulling arm is rotatably connected to the edge of the support seat, and a hook portion is provided at the other end of each pulling arm. The plurality of pulling arms can swing so that their hook portions are close to or away from each other.

[0005] The beneficial effects of the above technical solution are as follows: In this way, the notch of the abutting groove can be docked with the interface of the device to be detected, and the hook parts of the plurality of pulling arms are all hooked to the edge of the interface of the device to be detected. Then, the telescopic member drives the abutting groove to move until its notch is in sealing contact with the interface of the device to be detected. Then, gas is introduced into the abutting groove through the gas filling port to perform airtightness detection on the inner cavity of the device to be detected. After the detection is completed, the telescopic member can retract to conveniently remove the airtightness detection device from the device to be detected.

[0006] In the above technical solution, the abutting groove is a conical groove. The notch of the abutting groove is located at its thick end, and its thin end is sealed and coaxially rotatably connected to the telescopic end of the telescopic member.

[0007] The beneficial effects of the above technical solution are as follows: In this way, it has a small volume and is light, and at the same time, the force exerted by the telescopic member on the abutting groove is evenly distributed, so that the sealing performance of the notch of the abutting groove can be better when it is docked with the interface of the device to be detected.

[0008] In the above technical solution, annular grooves are provided on the outer walls of the notch ends of the abutting groove, and sealing washers are sleeved in the annular grooves.

[0009] The beneficial effects of the above technical solution are as follows: In this way, the sealing performance when the notch end of the abutting groove is docked with the device to be detected is further improved.

[0010] In the above technical solution, the telescopic member includes a lead screw and a handle. A threaded hole that is threadedly engaged with the lead screw is provided in the middle of the support seat. The lead screw passes through the threaded hole and is threadedly connected thereto. The handle is provided at one end of the lead screw away from the abutting groove. One end of the lead screw close to the abutting groove constitutes the telescopic end of the telescopic member and is rotatably connected to the middle of the bottom of the abutting groove.

[0011] The beneficial effects of the above technical solution are as follows: It has a simple structure, is easy to stretch and contract, and has a wider range of use scenarios.

[0012] In the above technical solution, the handle is a handwheel, and the handle is coaxially and fixedly installed at the corresponding end of the lead screw.

[0013] The beneficial effects of the above technical solution are as follows: It has a simple structure.

[0014] In the above technical solution, the support seat is a straight bar-shaped block, and there are two pulling arms. One pulling arm is provided at each end of the support seat.

[0015] The beneficial effects of the above technical solution are as follows: In this way, the two pulling arms can tighten the abutting groove and the device to be detected under the drive of the telescopic member.

[0016] In the above technical solution, the hook openings of the hook portions of the pulling arms all face the abutting grooves.

[0017] The beneficial effect of the above technical solution is that: in this way, it is more convenient for the hook portions of the pulling arms to be hooked to the device to be detected.

[0018] In the above technical solution, the hook portions of the pulling arms are arc-shaped.

[0019] The beneficial effect of the above technical solution is that: its structure is simple, and the hooking effect at the edge of the interface with the device to be detected is better.

[0020] In the above technical solution, the pulling arm includes a support arm and an extension arm. The extension arm has a tapered arc-shaped plate, and its thin end is connected to one end of the support arm. The other end of the support arm is rotatably connected to the support seat. An inward flanging is provided at the thick end of the extension arm to form the hook portion.

[0021] The beneficial effect of the above technical solution is that: in this way, the hooking effect of the pulling arm at the edge of the interface with the device to be detected is better, and the pulling force it can bear is greater.

[0022] In the above technical solution, an arc-shaped waist-shaped hole is provided at the hook portion.

[0023] The beneficial effect of the above technical solution is that: in this way, the waist-shaped hole can be pre-connected to the edge of the interface on the device to be detected, so that the airtightness detection operation can be carried out by a single person. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view of the airtightness detection device according to an embodiment of the present invention;

[0025] Figure 2 It is a side view of the airtightness detection device according to an embodiment of the present invention;

[0026] Figure 3 It is a front view of the abutting groove in the embodiment of the present invention;

[0027] Figure 4 It is a cross-sectional view of the abutting groove in the embodiment of the present invention;

[0028] Figure 5 It is a front view of the support seat in the embodiment of the present invention;

[0029] Figure 6 It is one of the front views of the pulling arm in the embodiment of the present invention;

[0030] Figure 7 It is a cross-sectional view of the nozzle end of a rocket engine in the prior art;

[0031] Figure 8 The front elevation view during the assembly of the airtightness detection device and the rocket engine according to the embodiment of the present utility model;

[0032] Figure 9 The cross-sectional view during the assembly of the airtightness detection device and the rocket engine according to the embodiment of the present utility model;

[0033] Figure 10 The second front elevation view of the pulling arm according to the embodiment of the present utility model;

[0034] Figure 11 The schematic diagram of the pin connection between the pulling arm of the airtightness detection device and the outer flange according to the embodiment of the present utility model.

[0035] In the figure: 10, airtightness detection device; 1, support seat; 11, hinge support; 12, screw hole; 2, abutting groove; 21, gas filling port; 22, annular groove; 23, sealing washer; 24, groove-shaped interface; 3, telescopic member; 31, lead screw; 32, handle; 4, pulling arm; 41, hook portion; 411, waist-shaped round hole; 42, extension arm; 43, support arm; 20, rocket engine; 210, nozzle; 211, outer flange; 2111, connection hole; 30, pin. Detailed implementation manners

[0036] The principles and features of the present utility model will be described below with reference to the accompanying drawings. The examples given are only for explaining the present utility model and are not intended to limit the scope of the present utility model. In the following paragraphs, the present utility model will be described more specifically by way of example with reference to the accompanying drawings. The advantages and features of the present utility model will be clearer according to the following description and the claims. It should be noted that the accompanying drawings are all in a very simplified form and use non-precise scales, and are only used to conveniently and clearly assist in explaining the purpose of the embodiments of the present utility model.

[0037] As Figure 7 shown, in this embodiment, the device to be detected is taken as the rocket engine 20 as an example. The interfaces communicating with the outside mainly include the nozzle 210 and the exhaust pipe. An outer flange 211 is provided at the nozzle 210. The nozzle 210 is in a flared shape. At this time, the airtightness detection device can be docked at the nozzle 210 of the rocket engine, and the exhaust pipe of the rocket engine is sealed with a sealing plug (the sealing method of the rocket engine exhaust pipe 52 is carried out according to the prior art, so it will not be elaborated here).

[0038] As Figure 1 、 Figure 2 、 Figures 7 - 9As shown in the figure, this embodiment provides an airtightness detection device. The airtightness detection device 10 includes a support base 1, an abutting groove 2, a telescopic member 3, and a plurality of pulling arms 4. The support base 1 and the abutting groove 2 are spaced apart, and the opening of the abutting groove 2 faces away from the support base 1. The telescopic member 3 is disposed in the middle of the support base 1, and its telescopic end is rotatably connected to the middle of the bottom of the abutting groove 2. An air inlet 21 communicating with the inside of the groove is provided on the side wall of the abutting groove 2. The plurality of pulling arms 4 are circumferentially spaced apart around the abutting groove 2. One end of each pulling arm 4 is rotatably connected to the edge of the support base 1, and a hook portion 41 is provided at the other end of each pulling arm 4. The plurality of pulling arms 4 can be swung so that their hook portions 41 are close to or away from each other. In this way, they can extend into the nozzle 210 from the opening of the abutting groove and abut against the inner wall of the nozzle 210. The hook portions of the plurality of pulling arms are all hooked to the edge of the outer flange 211. Then, the telescopic member extends to drive the abutting groove to move to abut against the nozzle in a sealed manner. Then, the air inlet is connected to the air outlet of the gas source member (the supplied gas can be nitrogen or helium) through a hose. At this time, gas is added into the inner cavity of the rocket engine through the abutting groove by the gas source member. After the pressure in the rocket engine reaches a certain value, it is kept pressurized for a period of time. At this time, it can be observed whether the pressure in the inner cavity of the rocket engine drops (if it drops, it means that the rocket engine has poor airtightness). At this time, a detector can be used to detect at each possible air leakage position of the rocket engine (detect whether the concentration of nitrogen or helium in the surrounding air exceeds the standard. If it exceeds the standard, it means that there is a leak at this site). After the detection is completed, the telescopic member can retract to conveniently remove the airtightness detection device from the rocket engine.

[0039] In this embodiment, the structure and principle of the airtightness detection device provided are similar to those of a puller. The core difference lies in adding an abutting groove to abut against the nozzle for sealed docking.

[0040] In this embodiment, the telescopic member can be a telescopic cylinder, such as a telescopic air cylinder, a hydraulic cylinder, or a telescopic electric cylinder.

[0041] Such as Figure 3 and Figure 4 As shown in the figure, in the above technical solution, the abutting groove 2 is a conical groove. The opening of the abutting groove 2 is at its thick end, and its thin end is sealed and rotatably connected to the telescopic end of the telescopic member 3 coaxially. In this way, it has a small volume and is light, and at the same time, the acting force applied by the telescopic member to the abutting groove is evenly distributed, so that the sealing performance of the opening of the abutting groove when docking with the nozzle 210 is better. In this embodiment, a groove-shaped interface 24 can be formed at the bottom of the abutting groove 2. The opening of the groove-shaped interface faces away from the opening of the abutting groove. The telescopic end of the telescopic member extends into the groove-shaped interface and is rotatably connected to it coaxially.

[0042] On the outer walls of the notch ends of the abutting grooves 2 in the above technical solution, there are annular grooves 22, and a sealing gasket 23 is sleeved in the annular groove 22, so that the sealing performance when the notch end of the abutting groove is docked with the device to be detected is further improved (mainly because the sealing gasket is clamped between the abutting groove and the inner wall of the nozzle, so as to seal the abutting part of the two).

[0043] As Figure 1 and Figure 2 shown, the telescopic member 3 in the above technical solution includes a lead screw 31 and a handle 32. A threaded hole 12 that is threadedly engaged with the lead screw 31 is provided in the middle of the support base 1. The lead screw 31 passes through the threaded hole 12 and is threadedly connected thereto. The handle 32 is provided at one end of the lead screw 31 away from the abutting groove 2. One end of the lead screw 31 close to the abutting groove 2 constitutes the telescopic end of the telescopic member 3 and is rotatably connected to the middle of the bottom of the abutting groove 2. Its structure is simple, the telescoping is convenient, and its usage scenario is wider (specifically, the telescopic member adopts a manual mechanism, so that it can be used as needed at any time); preferably, the handle 32 is a handwheel, and the handle 32 is coaxially and fixedly installed at the corresponding end of the lead screw 31, and its structure is simple.

[0044] As Figure 1 、 Figure 2 and Figure 5 shown, the support base 1 in the above technical solution is a straight bar-shaped block, and there are two pulling arms 4. One pulling arm 4 is provided at each end of the support base 1, so that the two pulling arms can tightly abut the abutting groove and the interface of the device to be detected (the connection method between the pulling arm and the support base can be that hinge supports 11 are provided at both ends of the support base close to the abutting groove side, and the corresponding pulling arms are rotatably connected by the hinge supports).

[0045] As Figure 1 、 Figure 2 and Figure 6 shown, the hook openings of the hook parts 41 of the pulling arms 4 in the above technical solution all face the abutting groove 2, so that it is more convenient for the hook parts of the pulling arms to be hooked to the device to be detected; specifically, the hook part 41 of the pulling arm 4 is arc-shaped, its structure is simple, and the effect of hooking to the flange is better. Especially when the wet hook part is hooked to the outer flange, the contact area is larger, so that its stability is better.

[0046] As Figure 1 、 Figure 2 and Figure 6As shown, in the above technical solution, the pulling arm 4 includes a support arm 43 and an extension arm 42. The tapered arc-shaped plate of the extension arm 42 (its cross-section is arc-shaped, but the arc diameter corresponding to its cross-section gradually increases from one end to the other end, specifically similar to cutting a horn-shaped cylinder into multiple parts along the axis in the axial direction to form multiple tapered arc-shaped plates), and its thin end is connected to one end of the support arm 43. The other end of the support arm 43 is rotatably connected to the support seat 1. The thick end of the extension arm 42 is provided with an inward flanging to form the hook portion 41, so that the effect of the pulling arm being hooked to the flange is better, and the pulling force it can bear is greater.

[0047] As Figure 1 shown, in this embodiment, the gas filling port can be located between two pulling arms, such that the edge hose is arranged.

[0048] The airtightness detection device provided in this embodiment requires two people to operate. One is responsible for turning the screw rod, and the other is responsible for supporting multiple pulling arms to prevent the support seat from rotating synchronously with the screw rod. In addition, it can also ensure that the hook portions of multiple pulling arms are preliminarily pre-hooked to the outer flange, avoiding the pulling arms from swinging and loosening from the flange by themselves.

[0049] As Figure 10 and Figure 11 shown, in order to enable the airtightness detection device to achieve single-person operation, at this time, an arc-shaped waist-shaped hole 411 can be provided at the hook portion 41 (multiple waist-shaped holes 411 can be arranged at intervals along the arc at each hook portion). In this way, the waist-shaped hole can be pin-connected with the connection hole 2111 on the outer flange (there are multiple circumferentially spaced connection holes 2111 on the outer flange, which belongs to the prior art and will not be elaborated here) (so that the pulling arm and the outer flange can be pre-connected, and at the same time, when the screw rod rotates, the support seat will not rotate accordingly. The pin 30 used for pin connection can be a steel ball pin), to pre-connect the pulling arm and the outer flange, so that a single person can perform the airtightness detection operation. Of course, only one waist-shaped hole at each hook portion needs to be aligned with any one of the connection holes on the outer flange and the pin can be inserted.

[0050] The above is only the preferred embodiment of the present invention, and does not impose any form of limitation on the present invention; any ordinary technician in the industry can smoothly implement the present invention according to the description in the accompanying drawings and the above description; however, any equivalent changes made by those skilled in the art within the scope of the technical solution of the present invention by using the technical content disclosed above for minor modifications, decorations and evolutions are all equivalent embodiments of the present invention; at the same time, any equivalent changes, modifications and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An airtightness detection device, characterized in that , including a support base (1), an abutment groove (2), a telescopic member (3) and a plurality of pulling arms (4). The support base (1) and the abutment groove (2) are arranged at intervals, and the notch of the abutment groove (2) faces away from the support base (1). The telescopic member (3) is arranged in the middle of the support base (1), and its telescopic end is rotatably connected to the middle of the bottom of the abutment groove (2). An air filling port (21) communicating with the inside of the groove is arranged on the side wall of the abutment groove (2). The plurality of pulling arms (4) are circumferentially and spacedly distributed around the abutment groove (2), and one end of each pulling arm (4) is rotatably connected to the edge of the support base (1). A hook portion (41) is arranged at the other end of each pulling arm (4). The plurality of pulling arms (4) can swing to make their hook portions (41) approach or move away from each other.

2. The airtightness detection device according to claim 1, characterized in that , The abutment groove (2) is a conical groove. The notch of the abutment groove (2) is located at its thick end, and its thin end is sealed and rotatably connected to the telescopic end of the telescopic member (3) coaxially.

3. The airtightness detection device according to claim 2, characterized in that , Ring grooves (22) are provided on the outer walls at the notch ends of the abutment groove (2), and sealing washers (23) are sleeved in the ring grooves (22).

4. The airtightness detection device according to claim 1, characterized in that , The telescopic member (3) includes a lead screw (31) and a handle (32). A threaded hole (12) threadedly engaged with the lead screw (31) is provided in the middle of the support base (1). The lead screw (31) penetrates through the threaded hole (12) and is threadedly connected thereto. The handle (32) is arranged at the end of the lead screw (31) away from the abutment groove (2). The end of the lead screw (31) close to the abutment groove (2) forms the telescopic end of the telescopic member (3) and is rotatably connected to the middle of the bottom of the abutment groove (2).

5. The airtightness detection device according to claim 4, wherein , The handle (32) is a handwheel, and the handle (32) is coaxially and fixedly installed at the corresponding end of the lead screw (31).

6. The airtightness detection device according to claim 1, characterized in that , The support base (1) is a straight bar-shaped block. There are two pulling arms (4), and one pulling arm (4) is arranged at each end of the support base (1).

7. The airtightness detection device according to claim 1, characterized in that , The hook openings of the hook portions (41) of the pulling arms (4) all face the abutment groove (2).

8. The airtightness detection device according to claim 1, characterized in that , The hook portions (41) of the pulling arms (4) are arc-shaped.

9. The airtightness detection device according to claim 8, characterized in that , The pulling arm (4) includes a support arm (43) and an extension arm (42). The extension arm (42) is a conical arc-shaped plate, and its thin end is connected to one end of the support arm (43). The other end of the support arm (43) is rotatably connected to the support base (1). An inward flanging is provided at the thick end of the extension arm (42) to form the hook portion (41).

10. The airtightness detection device according to claim 9, characterized in that , An arc-shaped waist-shaped hole (411) is provided at the hook portion (41).

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