A pipe airtightness testing device

Abstract

This utility model discloses a tube airtightness testing device, relating to the field of airtightness testing technology. It includes a pressure gauge and an inflatable bladder, and further comprises: a tracheal assembly connected to one end of the tube to be tested, the pressure gauge, and the bladder; two first clamping assemblies capable of clamping or releasing both ends of the tube to be tested; a second clamping assembly fixedly connected to the first clamping assembly near the tracheal assembly and clamping the tracheal assembly; and a sealing assembly fixedly connected to the first clamping assembly away from the tracheal assembly and sealing the end of the tube to be tested away from the tracheal assembly. This utility model overcomes the shortcomings of existing tube airtightness testing devices, such as unreliable connections and high false positive rates.

Description

Technical Field

[0001] The utility model relates to the technical field of airtightness detection, in particular to an airtightness detection device for a pipe body. Background Art

[0002] In the fields of industrial pipelines, building HVAC, instrument measurement and control, etc., the airtightness of pipe bodies (such as pressure measuring pipes, fluid conveying pipes, instrument connecting pipes) is an important index to ensure the stable operation of the system. If the airtightness does not meet the standard, it will cause medium leakage (such as gas pipeline leakage, liquid pipeline leakage), resulting in measurement errors (such as inaccurate pressure readings due to air leakage in the pressure measuring pipe), energy waste (such as leakage in the compressed air pipeline), and even safety risks (such as explosion caused by gas pipeline leakage). Therefore, it is necessary to detect the pipe body through an airtightness detection device.

[0003] The patent with the publication number CN204924595U discloses a pressure measuring pipe air permeability and airtightness detection device. The core detection logic of this device is as follows: the connection sleeve is sleeved on the input port of the pipe body, the output port of the pipe body is blocked, and the inflation airbag is squeezed to inflate the pipe body with gas. The pressure change in the pipe body is monitored through a pressure gauge. If the pressure remains stable, it is determined that the airtightness is qualified; if the pressure drops, it is determined that there is a leak. However, its "sleeved" connection method has defects of poor connection reliability and high misjudgment rate in practical applications. The specific problems are as follows: First, "the inner wall of the connection sleeve and the outer wall of the pipe body port are in interference fit" to achieve a sealed connection, that is, "sleeved". During the detection process, the pipe body is subjected to inflation pressure (usually 0.2 - 0.6 MPa), and it is easy to have relative sliding between the connection sleeve and the pipe body, the sleeved length is shortened, and even completely separated, resulting in the interruption of the detection.

[0004] Second, the core of airtightness detection is to judge leakage through "pressure change". If there is relative sliding between the connection sleeve and the pipe body during the pressure holding process and the sleeved length is shortened, it will directly cause the value of the pressure gauge to drop. At this time, even if the pipe body itself has no leakage (such as no pinhole defect on the wall of the pressure measuring pipe), it will be judged as "airtightness unqualified".

[0005] Therefore, it is necessary to develop an airtightness detection device for a pipe body aiming at the above defects. Utility Model Content

[0006] The purpose of the utility model is to provide an airtightness detection device for a pipe body, which overcomes the defects of "unreliable connection and high misjudgment rate" of the existing airtightness detection device for a pipe body.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions: An airtightness detection device for a pipe body of the utility model includes a pressure gauge and an airbag for inflation, and further includes: The tracheal assembly is connected to one end of the tube to be tested, the pressure gauge and the air bladder; The first clamping assembly has two parts, which can clamp or release the two ends of the tube body to be tested respectively; A second clamping assembly is fixedly connected to the first clamping assembly near the tracheal assembly and clamps the tracheal assembly. A blocking assembly is fixedly connected to the first clamping assembly located away from the tracheal assembly, and blocks the end of the tube to be tested that is away from the tracheal assembly.

[0008] Optionally, the tracheal assembly includes an air inlet pipe and a connector, one end of the connector being sealed to one end of the air inlet pipe; the end of the connector away from the air inlet pipe being sealed to the inner wall of one end of the tube body to be tested.

[0009] Optionally, it also includes an L-shaped three-way valve, wherein port A of the L-shaped three-way valve is connected to the airbag, and port B of the L-shaped three-way valve is connected to the end of the air intake pipe away from the connector.

[0010] Optionally, the pressure gauge is connected to the air intake pipe.

[0011] Optionally, the first clamping assembly includes an upper clamping block, a lower clamping block, screws, and a driving mechanism. Two screws are provided and pass through both ends of the upper clamping block respectively. The bottom end of the screw is threadedly connected to the lower clamping block. The driving mechanism is drivenly connected to the top end of the screw and can drive the two screws to rotate.

[0012] Optionally, the driving mechanism includes a first gear and a second gear, the second gear being configured and fixedly connected to the screw in a one-to-one correspondence; a fixed shaft is fixed to the top of the upper clamping block, the first gear is rotatably sleeved on the fixed shaft, the first gear and the second gear are meshed, the axial length of the first gear is greater than the axial length of the second gear, a prism is fixed to the top of the first gear, a limiting component is engaged on the fixed shaft, and the bottom surface of the limiting component is rotatably in contact with the top surface of the prism.

[0013] Optionally, the second clamping assembly includes an upper clamping block and a lower clamping block. The upper clamping block and the lower clamping block are respectively provided with V-shaped grooves on their sides that are close to each other. Bolts are passed through both ends of the upper clamping block and are threadedly connected to the lower clamping block. A connecting block is fixed between the lower clamping block of the first clamping assembly near the air tube assembly and the lower clamping block of the second clamping assembly.

[0014] Optionally, the sealing assembly includes a support block and a plug, one end of which is sealed and inserted into the tube body to be tested; a prism is fixed to the end of the plug away from the tube body to be tested, and a stud is fixed to the end of the prism away from the plug, the stud being threadedly connected to the support block; a connecting block is fixed between the lower clamping block of the first clamping assembly away from the tracheal assembly and the support block.

[0015] Compared with the prior art, the beneficial technical effects of this utility model are as follows: Two first clamping components are fixedly connected to the second clamping component and the sealing component respectively. The two ends of the tube to be tested are clamped and fixed by the first clamping components, ensuring that there is no relative sliding between the components during the test, improving the reliability of the connection, and thus effectively avoiding test interruption and misjudgment due to loose connection.

[0016] By setting an L-shaped three-way valve, the internal gas can be discharged after the test is completed, which facilitates subsequent disassembly.

[0017] By setting up a drive mechanism, both screws can be rotated simultaneously, eliminating the need to turn them one by one. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a partial cross-sectional view of the present invention. Figure 3 This is a partial structural front view of the present invention; Figure 4 This is a schematic diagram of the first clamping component of this utility model.

[0020] Explanation of reference numerals in the attached drawings: 100, pressure gauge; 110, buffer tube; 200, air bladder; 300, tube body to be tested; 400, air inlet pipe; 500, connector; 510, sealing gasket; 520, sealing ring; 600, L-shaped three-way valve; 700, inflation tube; 800, upper clamping block; 801, annular gasket; 810, fixed shaft; 811, limiting component; 900, lower clamping block; 1000, screw; 1100, first gear; 1110, prism; 1200, second gear; 1300, connecting block; 1400, support block; 1500, plug; 1510, prism; 1520, stud. Detailed Implementation

[0021] The core of this utility model is to provide a pipe airtightness testing device that overcomes the shortcomings of existing pipe airtightness testing devices, such as "unreliable connection and high false judgment rate".

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] In this utility model, unless otherwise explicitly specified and limited, the terms "setting", "installing", "connecting", "joining", "fixing", "sleeving", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in this utility model can be understood according to the specific circumstances.

[0024] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "middle", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0025] In one specific embodiment of this utility model, it includes a pressure gauge 100 and an airbag 200 for inflation, and further includes: The tracheal assembly is connected to one end of the tube body 300 to be tested, the barometer 100 and the air bag 200; The first clamping assembly has two parts, which can clamp or release the two ends of the tube body 300 to be tested respectively; The second clamping assembly is fixedly connected to the first clamping assembly near the trachea assembly and clamps the trachea assembly. The sealing component is fixedly connected to the first clamping component away from the tracheal component and seals the end of the tube body 300 to be tested away from the tracheal component.

[0026] In a specific embodiment of this utility model, the tracheal assembly includes an air inlet pipe 400 and a connector 500. One end of the connector 500 is sealed to one end of the air inlet pipe 400. Specifically, one end of the connector 500 is threaded to the air inlet pipe 400 (different specifications of connector 500 can be replaced). A sealing gasket 510 is provided inside the connector 500, and the sealing gasket 510 abuts against the end of the air inlet pipe 400 to form a seal. The end of the connector 500 away from the air inlet pipe 400 is sealed to the inner wall of one end of the tube body 300 to be tested. Specifically, a groove is opened at the end of the connector 500 away from the air inlet pipe 400, and a sealing ring 520 is fitted on the groove. After being inserted into the tube body 300 to be tested, the sealing ring 520 fits tightly against the inner wall of the tube body 300 to form a seal.

[0027] In one specific embodiment of this utility model, an L-shaped three-way valve 600 is also included. Port A of the L-shaped three-way valve 600 is connected to the airbag 200 via an inflation tube 700, and port B of the L-shaped three-way valve 600 is connected to the end of the air inlet pipe 400 furthest from the connector 500. During the testing process, ports A and B of the L-shaped three-way valve 600 are connected. After the test is completed, the L-shaped three-way valve 600 is operated to connect ports B and C, allowing the gas inside the tested tube 300 to be discharged from port C, thus depressurizing. Additionally, a silencer can be connected to port C.

[0028] In a specific embodiment of this utility model, the pressure gauge 100 and the air inlet pipe 400 are connected through a buffer pipe 110.

[0029] In a specific embodiment of this utility model, the first clamping assembly includes an upper clamping block 800, a lower clamping block 900, screws 1000, and a driving mechanism. Two screws 1000 are provided, each passing through both ends of the upper clamping block 800. The bottom end of each screw 1000 is threadedly connected to the lower clamping block 900. The driving mechanism is connected to the top end of each screw 1000 and can drive the two screws 1000 to rotate. V-grooves are respectively provided on the sides of the upper clamping block 800 and the lower clamping block 900 that are close to each other, and rubber plates are adhered to the V-grooves.

[0030] In a specific embodiment of this utility model, the driving mechanism includes a first gear 1100 and a second gear 1200. The second gear 1200 and the screw 1000 are respectively arranged and fixedly connected. A fixed shaft 810 is fixed to the top of the upper clamping block 800. The first gear 1100 is rotatably sleeved on the fixed shaft 810. The first gear 1100 and the second gear 1200 are both meshed. The axial length of the first gear 1100 is greater than the axial length of the second gear 1200. A prism 1110 is fixed to the top of the first gear 1100 to facilitate driving with a wrench. A limiting component 811 is clamped on the fixed shaft 810. The limiting component 811 can be an E-type retaining ring. The bottom surface of the limiting component 811 is rotatably in contact with the top surface of the prism 1110 to prevent the first gear 1100 from moving axially. In addition, an annular washer 801 can be fitted on the fixed shaft 810. The annular washer 801 is supported on the upper clamping block 800. The top surface of the annular washer 801 is in rotatable contact with the bottom end of the first gear 1100. The outer diameter of the annular washer 801 is smaller than the outer diameter of the first gear 1100, so as to avoid the bottom end of the first gear 1100 from being in full contact with the upper clamping block 800, thereby reducing the rotational friction of the first gear 1100.

[0031] In a specific embodiment of this utility model, the second clamping assembly includes an upper clamping block 800 and a lower clamping block 900. V-shaped grooves are respectively provided on the sides of the upper clamping block 800 and the lower clamping block 900 that are close to each other. A rubber plate is bonded in the V-shaped groove. Bolts are passed through both ends of the upper clamping block 800 and the bolts are threadedly connected to the lower clamping block 900. A connecting block 1300 is welded or bolted between the lower clamping block 900 of the first clamping assembly near the air tube assembly and the lower clamping block 900 of the second clamping assembly.

[0032] In a specific embodiment of this utility model, the sealing assembly includes a support block 1400 and a plug 1500. One end of the plug 1500 is sealed and inserted into the tube body 300 to be tested. Specifically, the plug 1500 has a groove, and a sealing ring 520 is fitted on the groove. After being inserted into the tube body 300 to be tested, the sealing ring 520 fits tightly against the inner wall of the tube body 300 to form a seal. A prism block 1510 is fixed to the end of the plug 1500 away from the tube body 300 to facilitate wrench engagement and drive. A stud 1520 is fixed to the end of the prism block 1510 away from the plug 1500. The stud 1520 is threadedly connected to the support block 1400 (different specifications of plug 1500 can be replaced). A connecting block 1300 is welded or bolted to the lower clamping block 900 of the first clamping assembly away from the tracheal assembly and fixed to the support block 1400.

[0033] Working principle The testing process for this device consists of five steps: clamping, inflation, pressure holding test, depressurization, and disassembly. The details are as follows: Clamping stage Select compatible components: Based on the inner diameter of the tube body 300 to be tested, select the corresponding specifications of the plug 500 and plug 1500, and thread them to the air inlet pipe 400 and support block 1400 respectively. Pipe positioning: Insert one end of the pipe body to be tested (300) into the connector (500) and the other end into the plug (1500); Clamping and fixing: Use a wrench to clamp the prism 1110 of the first clamping assembly and rotate it counterclockwise. The first gear 1100 drives the two second gears 1200 to rotate synchronously. The second gears 1200 drive the screw 1000 to rotate. The screw 1000 is threadedly connected to the lower clamping block 900. The second gear 1200 slides axially with the first gear 1100. The second gear 1200 presses down on the upper clamping block 800. The rubber plate in the V-groove clamps the end of the tube body 300 to be tested.

[0034] inflation stage Rotate the L-type three-way valve 600 handle to connect ports A and B; Repeatedly squeeze the inflatable airbag 200 and observe the reading on the pressure gauge 100 until the pressure reaches the set value (e.g., 0.4 MPa), then stop squeezing.

[0035] Pressure holding test stage Observing the changes in the barometer reading to determine whether the airtightness is up to standard is common knowledge. For details, please refer to the relevant content in the patent with announcement number CN204924595U, entitled "A Test Device for the Ventilation and Airtightness of a Pressure Measuring Tube". This is prior art and will not be elaborated here.

[0036] Decompression phase After the test is completed, rotate the L-shaped three-way valve 600 handle to connect ports B and C, allowing the internal gas to escape.

[0037] Disassembly stage Turn the prism 1110 of the first clamping assembly clockwise, and the second gear 1200 will no longer press the upper clamping block 800. Then the tube body 300 to be tested will no longer be clamped. At this time, the tube body 300 to be tested can be pulled out to complete one test.

[0038] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably, and the embodiments can be combined with each other. For the apparatus disclosed in the embodiments, since it corresponds to the method disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to in the method section.

[0039] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model. Various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model without departing from the spirit of the present utility model should fall within the protection scope defined by the claims of the present utility model.

Claims

1. A tube air tightness detection device, comprising a gas pressure gauge (100) and a gas bag (200) for inflation, characterized in that, Also includes: The tracheal assembly is connected to one end of the tube body (300) to be tested, the pressure gauge (100), and the air bag (200); The first clamping assembly has two parts, which can clamp or release the two ends of the tube body (300) to be tested respectively; A second clamping assembly is fixedly connected to the first clamping assembly near the tracheal assembly and clamps the tracheal assembly. A blocking assembly is fixedly connected to the first clamping assembly located away from the tracheal assembly and blocks the end of the tube body (300) to be tested (away from the tracheal assembly).

2. The tube airtightness detection device according to claim 1, characterized in that: The tracheal assembly includes an air inlet pipe (400) and a connector (500), one end of the connector (500) being sealed to one end of the air inlet pipe (400); the end of the connector (500) away from the air inlet pipe (400) being sealed to the inner wall of one end of the tube body (300) to be tested.

3. The pipe airtightness testing device according to claim 2, characterized in that: It also includes an L-shaped three-way valve (600), the A port of which is connected to the airbag (200), and the B port of which is connected to the end of the air inlet pipe (400) away from the connector (500).

4. The tube airtightness detection device according to claim 2 or 3, characterized in that: The pressure gauge (100) is connected to the air intake pipe (400).

5. The tube airtightness detection device according to claim 1, characterized in that: The first clamping assembly includes an upper clamping block (800), a lower clamping block (900), a screw (1000), and a driving mechanism. There are two screws (1000) that pass through both ends of the upper clamping block (800), and the bottom end of the screw (1000) is threadedly connected to the lower clamping block (900). The driving mechanism is connected to the top end of the screw (1000) and can drive the two screws (1000) to rotate.

6. The tube airtightness detection device according to claim 5, characterized in that: The driving mechanism includes a first gear (1100) and a second gear (1200). The second gear (1200) is correspondingly and fixedly connected to the screw (1000). A fixed shaft (810) is fixed to the top of the upper clamping block (800). The first gear (1100) is rotatably sleeved on the fixed shaft (810). The first gear (1100) and the second gear (1200) are both meshed. The axial length of the first gear (1100) is greater than the axial length of the second gear (1200). A prism (1110) is fixed to the top of the first gear (1100). A limiting component (811) is engaged on the fixed shaft (810). The bottom surface of the limiting component (811) is rotatably in contact with the top surface of the prism (1110).

7. The tube airtightness detection device according to claim 5, characterized in that: The second clamping assembly includes an upper clamping block (800) and a lower clamping block (900). V-grooves are respectively provided on the sides of the upper clamping block (800) and the lower clamping block (900) that are close to each other. Bolts are passed through both ends of the upper clamping block (800) and the bolts are threadedly connected to the lower clamping block (900). A connecting block (1300) is fixed between the lower clamping block (900) of the first clamping assembly near the air tube assembly and the lower clamping block (900) of the second clamping assembly.

8. The tube airtightness detection device according to claim 5, characterized in that: The sealing assembly includes a support block (1400) and a plug (1500). One end of the plug (1500) is sealed and inserted into the tube body (300) to be tested. A prism block (1510) is fixed to the end of the plug (1500) away from the tube body (300), and a stud (1520) is fixed to the end of the prism block (1510) away from the plug (1500). The stud (1520) is threadedly connected to the support block (1400). A connecting block (1300) is fixed between the lower clamping block (900) of the first clamping assembly away from the tracheal assembly and the support block (1400).

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