Fixture for air tightness detection

Abstract

The invention relates to the technical field of air tightness detection, in particular to a clamp for air tightness detection, which comprises a main body pipe, and rubber head assemblies are symmetrically arranged at the two ends of the main body pipe; the main body pipe is hollow, and an air pressure observation assembly is arranged in the center of the main body pipe; the air pressure observation assembly divides the inner cavity of the main body pipe into a left ventilation cavity and a right ventilation cavity from left to right. When the device is used, a detector inserts one end of the main body pipe into the standard part, inserts the other end into a to-be-detected part, and seals the standard part and the to-be-detected part through the rubber head assembly; an air pump is started to work, and the air pump synchronously pressurizes the interior of the standard part and the interior of the to-be-detected part through two sets of ventilation pipes; after pressurization is completed, the device stands and is flatly placed, the sealing performance of the to-be-detected piece can be rapidly judged by observing the position of the sliding block, the sealing performance difference between the to-be-detected piece and a standard piece can be visually judged, and the whole device is easy to carry.

Description

Technical Field

[0001] The invention relates to the technical field of airtightness detection, and in particular to a clamp for airtightness detection. Background Art

[0002] In the process of modern industrial production and quality control, airtightness testing is a vital task, which is widely used in many fields such as automobile manufacturing, home appliance production, medical equipment, aerospace, etc. The quality of airtightness directly affects the performance and safety of the product. Therefore, it is of great significance to develop efficient, accurate and portable airtightness testing methods and technologies.

[0003] The patent with application number CN201410421186.8 discloses an oil pump body airtight detection fixture, which includes an "L"-shaped base plate, a positioning template, a template support column, a first cylinder sealing mechanism, a second cylinder sealing mechanism and a double cylinder sealing mechanism. A positioning template is provided on the upper plane at a right angle of the "L"-shaped base plate, and the positioning template is installed on the "L"-shaped base plate through four template support columns. The first cylinder sealing mechanism and the double cylinder sealing mechanism are installed on the front side of the upper plane of the "L"-shaped base plate. The double cylinder sealing mechanism is located on the right side of the first cylinder sealing mechanism, and the second cylinder sealing mechanism is installed on the right side of the upper plane of the "L"-shaped base plate.

[0004] The above-mentioned airtightness detection methods and equipment are often bulky, inconvenient to carry and move, and cannot be flexibly used in various environments; and cannot be directly compared with standard parts, making it difficult to intuitively judge the difference in sealing performance between the parts to be tested and the standard parts. Summary of the invention

[0005] In view of this, the purpose of the present invention is to provide a fixture for airtightness testing to solve the problem that the existing airtightness testing equipment is not convenient to carry and move, and cannot be visually compared with standard parts.

[0006] Based on the above purpose, the present invention provides a fixture for air tightness detection, comprising a main body tube, and rubber head assemblies are symmetrically arranged at both ends of the main body tube; the main body tube is hollow, and an air pressure observation assembly is arranged at the center of the main body tube; the air pressure observation assembly divides the inner cavity of the main body tube into a left ventilation cavity and a right ventilation cavity from the right to the right;

[0007] An air pump is fixedly arranged on the top of the main body tube, and ventilation pipes are arranged at both ends of the air pump, and two sets of air delivery pipes are respectively connected to the left ventilation cavity and the right ventilation cavity;

[0008] The air pressure observation component includes two groups of blocking blocks, which are fixedly arranged in the inner cavity of the main tube. The two groups of blocking blocks are symmetrically arranged on both sides of the center of the main tube, and an intermediate cavity is formed between the two groups of blocking blocks. A slider is arranged in the intermediate cavity, and the outer wall of the slider is in contact with the inner cavity of the main tube; the blocking block has a hole in the center.

[0009] Furthermore, the rubber head assembly includes a ventilation tube, and two groups of ventilation tubes are symmetrically fixedly connected to the two ends of the main tube. The two groups of ventilation tubes are hollow and the inner cavities of the two groups of ventilation tubes are respectively connected to the left ventilation cavity and the right ventilation cavity; the end of the ventilation tube away from the main tube is fixedly connected to an insertion tube, and a rubber head is fixedly sleeved on the insertion tube.

[0010] Furthermore, the ventilation pipe is provided with an extrusion component for extruding the rubber head to deform.

[0011] Furthermore, the extrusion assembly includes a fixed plate, a fixed sleeve on the insertion tube is provided with a fixed plate, a movable sleeve on the insertion tube is provided with an extrusion plate, and a pushing part for driving the extrusion plate to move is provided on the ventilation tube.

[0012] Furthermore, the pushing part includes a pushing tube sleeve, which is slidably sleeved on the insertion tube, and a limiting part is provided on the insertion tube to prevent the pushing tube sleeve from rotating. One end of the pushing tube sleeve is fixedly connected to the extrusion plate, and an external thread is provided on the pushing tube sleeve; a rotating tube sleeve is sleeved on the pushing tube sleeve, and one end of the rotating tube sleeve is rotatably connected to the main tube, and an internal thread matching the external thread of the pushing tube sleeve is provided on the inner wall of the rotating tube sleeve.

[0013] Furthermore, the limiting portion includes a limiting groove, the inner wall of the pushing tube sleeve is fixedly provided with the limiting groove, and the ventilation tube is fixedly provided with a limiting block adapted to the limiting groove.

[0014] Furthermore, a friction rubber sleeve is provided on the fixed sleeve of the rotating tube sleeve.

[0015] Furthermore, observation windows for observing the position of the slider are respectively provided on the front and back sides of the main tube.

[0016] Furthermore, the air pump includes a shell, which is arranged on the top of the main tube, a micro air pump is arranged in the shell, an air inlet of the micro air pump is arranged on the top of the shell, an air outlet pipe is arranged at the start of the micro air pump, an air guide pipe is arranged in the shell, both ends of the air guide pipe are respectively connected to two groups of air supply pipes, and the middle part of the air guide pipe is connected to the air outlet pipe.

[0017] The beneficial effects of the present invention are as follows: the inspector inserts one end of the two ends of the main tube into the standard part and the other end into the part to be inspected, and seals the two through the rubber head assembly; the air pump is started, and the air pump pressurizes the standard part and the part to be inspected simultaneously through two sets of ventilation pipes; after the pressurization is completed, the device is left to stand and laid flat, and the inspector can quickly judge the sealing performance of the part to be inspected by observing the position of the slider, and can intuitively judge the difference in sealing performance between the part to be inspected and the standard part, and the device as a whole is easy to carry; in addition, by utilizing the cooperation between the external thread on the outer periphery of the pushing tube sleeve and the internal thread on the inner periphery of the rotating tube sleeve, the rotating rotating tube sleeve will drive the pushing tube sleeve to move, thereby driving the extrusion plate at the end of the pushing tube sleeve to move, squeezing the rubber head to deform the rubber head, and the deformed rubber head can fit tightly to the inner wall of the opening of the part to be inspected or the standard part by utilizing its own elasticity, so that the part to be inspected or the standard part is sealed, thereby being able to meet the requirements of air tightness detection of workpieces of different shapes, thereby improving the applicability of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only for the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of the main structure of an embodiment of the present invention;

[0020] Figure 2 A schematic diagram of a split structure of an embodiment of the present invention;

[0021] Figure 3 This is a schematic diagram of the internal cross-sectional structure of the main body tube according to an embodiment of the present invention;

[0022] Figure 4 This is a schematic diagram of the internal cross-sectional structure of the rubber head assembly according to an embodiment of the present invention;

[0023] Figure 5 This is a schematic structural diagram of the connection relationship between the push tube sleeve and the ventilation tube in an embodiment of the present invention;

[0024] Figure 6 Schematic diagram of the internal structure of the air pump according to an embodiment of the present invention.

[0025] The markings in the figure are:

[0026] 1. Main tube; 101. Left ventilation cavity; 102. Right ventilation cavity; 103. Middle cavity; 2. Air pump; 201. Air pipe; 202. Shell; 203. Micro air pump; 204. Air inlet; 205. Air outlet pipe; 206. Air guide pipe; 3. Blocking block; 4. Sliding block; 5. Ventilation pipe; 6. Rotating sleeve; 601. Friction rubber sleeve; 7. Push sleeve; 701. Extrusion plate; 8. Insertion tube; 801. Fixing plate; 9. Rubber head; 10. Observation window. DETAILED DESCRIPTION

[0027] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with specific embodiments.

[0028] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the present invention should be understood by people with ordinary skills in the field to which the present invention belongs. The "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0029] like Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 As shown, a fixture for air tightness detection includes a main body tube 1, and rubber head components are symmetrically arranged at both ends of the main body tube 1; the main body tube 1 is hollow, and an air pressure observation component is arranged at the center of the main body tube 1; the air pressure observation component divides the inner cavity of the main body tube 1 into a left ventilation cavity 101 and a right ventilation cavity 102 from the right to the right;

[0030] An air pump 2 is fixedly arranged on the top of the main tube 1, and ventilation pipes 5 are arranged at both ends of the air pump 2. Two sets of air delivery pipes 201 are respectively connected to the left ventilation cavity 101 and the right ventilation cavity 102;

[0031] The air pressure observation component includes two groups of blocking blocks 3, which are fixedly arranged in the inner cavity of the main tube 1, and the two groups of blocking blocks 3 are symmetrically arranged on both sides of the center of the main tube 1, and an intermediate cavity 103 is formed between the two groups of blocking blocks 3, and a slider 4 is arranged in the intermediate cavity 103, and the outer wall of the slider 4 is in contact with the inner cavity of the main tube 1; the blocking block 3 has a hole in the center.

[0032] In this embodiment, the inspector inserts one end of the main tube 1 into the standard part and the other end into the part to be inspected, and seals the two ends through the rubber head 9 assembly; starts the air pump 2, and the air pump 2 simultaneously pressurizes the standard part and the part to be inspected through two sets of ventilation pipes 5; after the pressurization is completed, the device is left to stand and laid flat, and the position of the slider 4 is observed to judge the sealing of the part to be inspected;

[0033] If the seal of the tested part is good and the internal air pressure of the tested part is consistent with that of the standard part, the slider 4 will approach between the two groups of blocking blocks 3. Similarly, when the inspector sees that the position of the slider 4 is close to between the two groups of blocking blocks 3, he can quickly judge that the seal of the tested part is good.

[0034] If the seal of the tested part is poor, the internal air pressure of the tested part will be lower than that of the standard part, and the slider 4 will shift toward the tested part. When the inspector sees that the slider 4 shifts toward the tested part, he can quickly determine that the seal of the tested part is poor.

[0035] Preferably, the rubber head assembly includes a vent pipe 5, two sets of vent pipes 5 are symmetrically fixedly connected at both ends of the main pipe 1, the two sets of vent pipes 5 are hollow, and the inner cavities of the two sets of vent pipes 5 are respectively connected to the left vent cavity 101 and the right vent cavity 102; one end of the vent pipe 5 away from the main pipe 1 is fixedly connected to an insertion pipe 8, and a rubber head 9 is fixedly sleeved on the insertion pipe 8;

[0036] In this embodiment, the inspector inserts one end of the main tube 1 into the standard part, and the other end into the part to be inspected, and seals the two parts through the rubber head 9 assembly;

[0037] Specifically, the inspector inserts the insertion tubes 8 at both ends into the workpiece to be inspected and the standard part, and uses the rubber head 9 on the insertion tube 8 to seal the opening of the workpiece to be inspected or the standard part to make the two sealed; starts the air pump 2, and the air pump 2 pressurizes the workpiece to be inspected and the standard part through two sets of air supply pipes 201 to the left ventilation cavity 101 and the right ventilation cavity 102.

[0038] Preferably, the vent pipe 5 is provided with an extrusion component for extruding the rubber head 9 to deform;

[0039] In this embodiment, the rubber head 9 can be squeezed by the extrusion component to deform the rubber head 9. The deformed rubber head 9 can fit tightly against the inner wall of the opening of the part to be inspected or the standard part by utilizing its own elasticity, so that the part to be inspected or the standard part is sealed, thereby being able to meet the airtightness test of workpieces of different shapes and improving applicability.

[0040] Preferably, the extrusion assembly includes a fixed plate 801, a fixed sleeve of the insertion tube 8 is provided with the fixed plate 801, a movable sleeve of the insertion tube 8 is provided with an extrusion plate 701, and a pushing part for driving the extrusion plate 701 to move is provided on the ventilation tube 5;

[0041] In this embodiment, the pushing part is used to drive the extrusion plate 701 to be close to or away from the fixed plate 801, thereby realizing the step of extruding the rubber head 9 arranged therebetween; specifically, when inserting the rubber head 9 into the part to be inspected or the standard part, the pushing part is first used to drive the extrusion plate 701 away from the fixed plate 801, so that the rubber head 9 is in a natural state. At this time, the rubber head 9 is not deformed, and the cross-section of the rubber head 9 is small, which is convenient for the inspector to insert the rubber head 9; after the rubber head 9 is inserted, the pushing part is used to drive the extrusion plate 701 close to the fixed plate 801 to squeeze the rubber head 9 and increase the cross-section of the rubber head 9. The rubber head 9 will fit tightly on the inner wall of the opening of the part to be inspected or the standard part by its own elasticity, thereby completing the sealing of the opening of the part to be inspected or the standard part.

[0042] Preferably, the pushing part includes a push sleeve 7, which is slidably sleeved on the insertion tube 8, and a limiting part is provided on the insertion tube 8 to prevent the push sleeve 7 from rotating. One end of the push sleeve 7 is fixedly connected to the extrusion plate 701, and the push sleeve 7 is provided with an external thread; a rotating sleeve 6 is sleeved on the push sleeve 7, and one end of the rotating sleeve 6 is rotatably connected to the main tube 1, and the inner wall of the rotating sleeve 6 is provided with an internal thread adapted to the external thread of the push sleeve 7;

[0043] In this embodiment, the pushing part is used to drive the extrusion plate 701 to approach or move away from the fixed plate 801; specifically, the inspector rotates the rotating sleeve 6, and due to the restriction of the limiting part on the pushing sleeve 7, the pushing sleeve 7 can only move in the horizontal direction and cannot rotate; therefore, by utilizing the cooperation between the external thread on the outer periphery of the pushing sleeve 7 and the internal thread on the inner periphery of the rotating sleeve 6, the rotating rotating sleeve 6 will drive the pushing sleeve 7 to move, thereby driving the extrusion plate 701 at the end of the pushing sleeve 7 to move; specifically, rotating the rotating sleeve 6 clockwise can drive the extrusion plate 701 to approach the fixed plate 801, thereby squeezing the rubber head 9 and deforming the rubber head 9; rotating the rotating sleeve 6 counterclockwise can drive the extrusion plate 701 away from the fixed plate 801, thereby releasing the squeezing of the rubber head 9 and resetting the rubber head 9.

[0044] Preferably, the limiting portion includes a limiting groove, the inner wall of the push pipe sleeve 7 is fixedly provided with the limiting groove, and the vent pipe 5 is fixedly provided with a limiting block adapted to the limiting groove;

[0045] In this embodiment, a limiting portion is provided on the insertion tube 8 to prevent the pushing tube sleeve 7 from rotating; specifically, the limiting groove and the limiting block are provided to prevent the pushing tube sleeve 7 from rotating and can only move laterally; therefore, by utilizing the cooperation between the external thread on the outer circumference of the pushing tube sleeve 7 and the internal thread on the inner circumference of the rotating tube sleeve 6, the rotating rotating tube sleeve 6 will drive the pushing tube sleeve 7 to move, thereby driving the extrusion plate 701 at the end of the pushing tube sleeve 7 to move, squeezing the rubber head 9 to deform the rubber head 9, and the deformed rubber head 9 can fit tightly against the inner wall of the opening of the to-be-tested part or the standard part by utilizing its own elasticity, so that the to-be-tested part or the standard part is sealed, thereby being able to meet the requirements of air tightness detection of workpieces of different shapes, thereby improving applicability.

[0046] Preferably, a fixed sleeve on the rotating sleeve 6 is provided with a friction rubber sleeve 601; the friction rubber sleeve 601 increases the friction with the inspector's hand, making it convenient for the inspector to rotate the rotating sleeve 6; at the same time, the friction rubber head 9 itself is relatively soft, which can improve the comfort of the inspector rotating the rotating sleeve 6.

[0047] Preferably, observation windows 10 for observing the position of the slider 4 are respectively provided on the front and back of the main tube 1; through the opened observation windows 10, the inspector can intuitively see the position of the slider 4 to judge the sealing of the inspected part.

[0048] Preferably, the air pump 2 includes a shell 202, which is arranged on the top of the main tube 1, and a micro air pump 203 is arranged in the shell 202. An air inlet 204 of the micro air pump 203 is arranged on the top of the shell 202, and an air outlet pipe 205 is arranged at the beginning of the micro air pump 203. An air guide pipe 206 is arranged in the shell 202, and both ends of the air guide pipe 206 are respectively connected to the two groups of air supply pipes 201, and the middle part of the air guide pipe 206 is connected to the air outlet pipe 205.

[0049] When in use, the inspector inserts the rubber head 9 components at both ends of the main tube 1 into the standard part and the part to be inspected respectively, rotates the tube sleeve 6 to drive the push tube sleeve 7 to move, and drives the extrusion plate 701 to move to squeeze the rubber head 9 to deform the rubber head 9. The deformed rubber head 9 can fit tightly against the inner wall of the opening of the part to be inspected or the standard part by its own elasticity, so that the part to be inspected or the standard part is airtight; then, start the air pump 2, and the air pump 2 simultaneously pressurizes the inside of the standard part and the part to be inspected through two sets of ventilation pipes 5; after the pressurization is completed, let the device stand still and lay flat, observe the position of the slider 4 and judge the sealing of the part to be inspected.

[0050] The invention provides a clamp for testing air tightness. The inspector inserts one end of the main tube 1 into the standard part and the other end into the part to be tested, and seals the two together through the rubber head 9 assembly; starts the air pump 2, and the air pump 2 simultaneously pressurizes the inside of the standard part and the part to be tested through two sets of ventilation pipes 5; after the pressurization is completed, the device is left to stand still and laid flat, and the inspector can quickly judge the sealing of the part to be tested by observing the position of the slider 4; in addition, by utilizing the cooperation between the external thread on the outer periphery of the pushing sleeve 7 and the internal thread on the inner periphery of the rotating sleeve 6, the rotating rotating sleeve 6 will drive the pushing sleeve 7 to move, thereby driving the extrusion plate 701 at the end of the pushing sleeve 7 to move, squeezing the rubber head 9 to deform the rubber head 9, and the deformed rubber head 9 can fit tightly against the inner wall of the opening of the part to be tested or the standard part by utilizing its own elasticity, so that the part to be tested or the standard part is sealed, thereby being able to meet the requirements of air tightness testing of workpieces of different shapes, thereby improving the applicability of the device.

[0051] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present invention (including the claims) is limited to these examples. Under the concept of the present invention, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the present invention as described above, which are not provided in detail for the sake of simplicity.

[0052] The present invention is intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A clamp for airtightness detection, comprising a main tube (1), characterized in that: The two ends of the main body tube (1) are symmetrically provided with rubber head components; the main body tube (1) is hollow, and the center of the main body tube (1) is provided with an air pressure observation component; The air pressure observation component divides the inner cavity of the main body tube (1) into a left ventilation cavity (101) and a right ventilation cavity (102) from the right to the right; An air pump (2) is fixedly arranged on the top of the main body tube (1), ventilation pipes (5) are respectively arranged at both ends of the air pump (2), and two groups of air delivery pipes (201) are respectively connected to the left ventilation cavity (101) and the right ventilation cavity (102); The air pressure observation assembly comprises two groups of blocking blocks (3), the two groups of blocking blocks (3) are fixedly arranged in the inner cavity of the main tube (1), the two groups of blocking blocks (3) are symmetrically arranged on both sides of the center of the main tube (1), and an intermediate cavity (103) is formed between the two groups of blocking blocks (3), a slider (4) is arranged in the intermediate cavity (103), and the outer wall of the slider (4) is in contact with the inner cavity of the main tube (1); the blocking block (3) has a central opening.

2. The airtightness detection fixture according to claim 1, characterized in that: The rubber head assembly comprises a ventilation tube (5), two groups of ventilation tubes (5) are symmetrically fixedly connected at both ends of the main tube (1), the two groups of ventilation tubes (5) are hollow, and the inner cavities of the two groups of ventilation tubes (5) are respectively connected to the left ventilation cavity (101) and the right ventilation cavity (102); one end of the ventilation tube (5) away from the main tube (1) is fixedly connected to an insertion tube (8), and a rubber head (9) is fixedly sleeved on the insertion tube (8).

3. The airtightness detection fixture according to claim 2, characterized in that: The ventilation pipe (5) is provided with an extrusion component for extruding the rubber head (9) to deform.

4. The airtightness detection fixture according to claim 3, characterized in that: The extrusion assembly comprises a fixed plate (801), a fixed sleeve of the insertion tube (8) is provided with the fixed plate (801), a movable sleeve of the insertion tube (8) is provided with an extrusion plate (701), and a pushing part for driving the extrusion plate (701) to move is provided on the ventilation tube (5).

5. The airtightness testing fixture according to claim 4, characterized in that: The pushing portion comprises a push sleeve (7), the push sleeve (7) is slidably sleeved on the insertion tube (8), a limiting portion is provided on the insertion tube (8) to prevent the push sleeve (7) from rotating, one end of the push sleeve (7) is fixedly connected to the extrusion plate (701), and the push sleeve (7) is provided with an external thread; a rotating sleeve (6) is sleeved on the push sleeve (7), one end of the rotating sleeve (6) is rotatably connected to the main body tube (1), and the inner wall of the rotating sleeve (6) is provided with an internal thread that matches the external thread of the push sleeve (7).

6. The airtightness testing fixture according to claim 5, characterized in that: The limiting portion comprises a limiting groove, the inner wall of the pushing pipe sleeve (7) is fixedly provided with the limiting groove, and the ventilation pipe (5) is fixedly provided with a limiting block adapted to the limiting groove.

7. The airtightness testing fixture according to claim 6, characterized in that: The fixed sleeve on the rotating sleeve (6) is provided with a friction rubber sleeve (601).

8. The airtightness testing fixture according to claim 1, characterized in that: The front and back sides of the main body tube (1) are respectively provided with observation windows (10) for observing the position of the slider (4).

9. The airtightness testing fixture according to claim 1, characterized in that: The air pump (2) comprises a shell (202), the shell (202) being arranged on the top of the main tube (1), a micro air pump (203) being arranged in the shell (202), an air inlet (204) of the micro air pump (203) being arranged on the top of the shell (202), an air outlet pipe (205) being arranged at the beginning of the micro air pump (203), an air guide pipe (206) being arranged in the shell (202), two ends of the air guide pipe (206) being respectively connected to the two groups of air delivery pipes (201), and a middle part of the air guide pipe (206) being connected to the air outlet pipe (205).

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