Nozzle replacement structure and air permeameter

Abstract

The utility model discloses a nozzle replacement structure and air permeation instrument mainly relates to air permeation detection equipment technical field, including carousel, the upper portion of carousel is equipped with upper support, the lower portion of carousel is equipped with lower support, and carousel upper annular array is equipped with a plurality of air holes, the bottom of carousel is equipped with lower sealing pipe spare, the top of carousel is equipped with upper sealing pipe spare, the width of the coincident part of the projection of the center hole of upper sealing pipe spare, the center hole of lower sealing pipe spare on carousel is greater than the pore size of the biggest air hole, and when carousel rotates, can rotate air hole to the center hole of upper sealing pipe spare and the center hole of lower sealing pipe spare between, the bottom of upper sealing pipe spare and carousel abuts, and the top is connected with upper support pipe spare, the utility model discloses carousel type structure, can conveniently, fastly complete the replacement of corresponding model nozzle, can improve work efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of air permeability testing equipment, specifically a nozzle replacement structure and an air permeability meter. Background Technology

[0002] An air permeability meter, also known as an air permeability tester, is an instrument used to test the air permeability of breathable materials such as textiles and non-woven fabrics. It is mainly used in industrial or civilian fields such as sportswear, filter cloth, and parachutes. The instrument evaluates air permeability by measuring the air flow rate per unit time and unit area of ​​fabric under pressure difference.

[0003] Air permeability meters are usually equipped with nozzles of various sizes. Different nozzles have different inner diameters. Users can select the appropriate nozzle according to the thickness of the material being tested. For example, when testing thin materials such as microporous filter membranes, a smaller nozzle size is used; when testing thicker materials such as industrial filter cloths, a larger nozzle size is required.

[0004] Currently, the nozzles of air permeability meters are mainly of two types: knob nozzles and plug-in nozzles. Knob nozzles are installed by threaded connection, which is extremely cumbersome to replace. It requires opening the hatch, unscrewing the nozzle, and locking the hatch, which is labor-intensive, time-consuming, and prone to air leakage, resulting in low test accuracy. Plug-in nozzles are installed by plugging and unplugging, which is more convenient than knob nozzles, but it is also more troublesome when replacing nozzles frequently, and an additional storage box is required for the nozzles. Summary of the Invention

[0005] The purpose of this invention is to solve the problems existing in the prior art and provide a nozzle replacement structure and an air permeability meter. The rotary structure can conveniently and quickly complete the replacement of nozzles of the corresponding model, thereby improving work efficiency.

[0006] To achieve the above objectives, this utility model employs the following technical solution: A nozzle replacement structure includes a turntable, an upper support above the turntable, and a lower support below the turntable. The turntable is rotatably connected to the lower support via a rotating support member. The turntable has a plurality of vent holes arranged in a circular array, with different vent hole diameters. A lower sealing tube is located at the bottom of the turntable, with its top end abutting against the turntable and its bottom end connected to a lower support tube, which is mounted on the lower support member. An upper sealing tube is located at the top of the turntable. The width of the overlapping portion of the projections of the center holes of the upper and lower sealing tubes onto the turntable is greater than the diameter of the largest vent hole. When the turntable rotates, the vent hole can be rotated to between the center holes of the upper and lower sealing tubes. The bottom end of the upper sealing tube abuts against the turntable, and its top end is connected to the upper support tube, which is mounted on the upper support member.

[0007] Preferably, both the lower sealing pipe and the upper sealing pipe are polytetrafluoroethylene (PTFE) pipes.

[0008] Preferably, the centerlines of the lower sealing pipe and the upper sealing pipe coincide, and the distance between the centerlines of the lower sealing pipe and the upper sealing pipe and the centerline of the rotating support is equal to the distance between the centerline of the vent hole and the centerline of the rotating support.

[0009] Preferably, the rotating support includes a mounting base disposed on the lower bracket, the top of the mounting base is provided with a mounting shaft rotatably connected to the mounting base, the upper part of the mounting shaft is provided with a connecting plate, the upper part of the connecting plate is provided with a locking plate, the locking plate and the connecting plate are connected by an adjusting screw, and the rotating plate is provided with a central mounting hole adapted to the mounting shaft and a first through hole adapted to the adjusting screw.

[0010] Preferably, the upper support tube is provided with a pressure plate, the pressure plate is located on the lower side of the upper bracket, the upper bracket is provided with a through hole adapted to the upper support tube, the top end of the upper support tube extends upward out of the through hole and is slidably connected with the through hole, and an elastic pressing structure is provided between the pressure plate and the upper bracket.

[0011] Preferably, the elastic pressing structure includes a plurality of supporting screws and a spring sleeved on the supporting screws. The upper bracket is provided with a second through hole adapted to the supporting screws, and the supporting screws are slidably connected to the second through hole. The bottom end of the supporting screws is mounted on the pressure plate, the bottom end of the spring abuts against the pressure plate, and the top end abuts against the upper bracket.

[0012] Preferably, the edge of the turntable is provided with a plurality of levers evenly distributed along the circumference of the turntable.

[0013] Preferably, the turntable is provided with a positioning indicator component on its upper and / or lower side, the positioning indicator component is provided with a spring plunger pointing vertically to the turntable, and the turntable is provided with a plurality of positioning grooves in a circular array that are adapted to the spring plunger, and one or more positioning grooves are arranged on the radial line of the turntable where each vent is located.

[0014] Preferably, a support member is provided between the upper support and the lower support, and threaded posts are provided at both the upper and lower ends of the support member.

[0015] The air permeability meter using the above-mentioned nozzle replacement structure includes a frame, a fan installed inside the frame, a workbench installed on the top of the frame, and an air inlet cylinder installed on the workbench and inserted downward into the frame. The bottom end of the air inlet cylinder is connected to an upper support pipe through a telescopic pipe, and the lower support pipe is connected to the fan through a connecting pipe. The frame is provided with a bracket to support the nozzle replacement structure, and the front, left, or right side of the frame is provided with an operating window adapted to the turntable.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model adopts a turntable structure. The vent holes of different diameters on the turntable are nozzles of different models. By rotating the turntable, the vent holes of different diameters can be adjusted to be between the center holes of the upper sealing pipe and the center holes of the lower sealing pipe, connecting the upper sealing pipe and the lower sealing pipe to complete the replacement of the nozzle. This allows for convenient and quick replacement of the corresponding model of nozzle, thereby improving work efficiency. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the nozzle replacement structure of this utility model.

[0018] Figure 2 This is a structural schematic diagram of the rotating support component.

[0019] Figure 3 This is a schematic diagram of the three-dimensional structure of the turntable.

[0020] Figure 4 This is a schematic diagram of the turntable's planar structure.

[0021] Figure 5 This is a schematic diagram of the internal structure of the air permeability meter of this utility model.

[0022] Figure 6 This is a three-dimensional structural diagram of the air permeability meter of this utility model.

[0023] The following are the labels in the attached diagram: 1. Turntable; 11. Vent hole; 12. Center mounting hole; 13. First through hole; 14. Lever; 15. Positioning groove; 2. Upper bracket; 3. Lower bracket; 4. Rotating support; 41. Mounting base; 42. Mounting shaft; 43. Mounting shaft; 44. Locking disc; 45. Adjusting screw; 5. Lower sealing pipe; 51. Lower support pipe; 6. Upper sealing pipe; 61. Upper support pipe; 62. Pressure plate; 63. Support screw; 64. Spring; 7. Positioning indicator assembly; 71. Spring plunger; 8. Support; 81. Threaded column; 9. Frame; 91. Fan; 92. Workbench; 93. Air inlet; 94. Telescopic pipe; 95. Connecting pipe; 96. Bracket; 97. Operation window. Detailed Implementation

[0024] The present invention will be further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the present invention, and these equivalent forms also fall within the scope defined in this application.

[0025] Example 1: As shown in the attached document Figure 1-4 As shown, the present invention describes a nozzle replacement structure, including a turntable 1, an upper support 2 above the turntable 1, and a lower support 3 below the turntable 1. Both the upper support 2 and the lower support 3 can be made of sheet metal. The turntable 1 is rotatably connected to the lower support 3 through a rotating support 4. The turntable 1 has a plurality of vent holes 11 arranged in a circular array with the axis of the rotating support 4 as the center, and the vent holes 11 have different diameters. The vent holes 11 with different diameters are nozzles of different models.

[0026] A lower sealing pipe 5 is provided at the bottom of the turntable 1. The top end of the lower sealing pipe 5 abuts against the turntable 1, and the bottom end is connected to the lower support pipe 51. The lower support pipe 51 is installed on the lower bracket 3 by screws. A flange structure can be provided on the outer wall of the lower support pipe 51. An upper sealing pipe 6 is provided at the top of the turntable 1. The width of the overlapping part of the projection of the center hole of the upper sealing pipe 6 and the center hole of the lower sealing pipe 5 on the turntable 1 is greater than the diameter of the largest vent hole 11. When the turntable 1 rotates, the vent hole 11 can be rotated to the space between the center holes of the upper sealing pipe 6 and the lower sealing pipe 5, so that the vent hole 11 can connect the upper sealing pipe 6 and the lower sealing pipe 5. The bottom end of the upper sealing pipe 6 abuts against the turntable 1, and the top end is connected to the upper support pipe 61. The upper support pipe 61 is installed on the upper bracket 2.

[0027] Preferably, both the lower sealing pipe 5 and the upper sealing pipe 6 are polytetrafluoroethylene pipes, which are wear-resistant and have better sealing performance with the turntable 1.

[0028] Preferably, the center lines of the lower sealing pipe 5 and the upper sealing pipe 6 coincide, and the distance between the center lines of the lower sealing pipe 5 and the upper sealing pipe 6 and the center line of the rotating support 4 is equal to the distance between the center line of the vent hole 11 and the center line of the rotating support 4, which can ensure that the vent hole 11 can connect the lower sealing pipe 5 and the upper sealing pipe 6.

[0029] Preferably, the rotating support 4 includes a mounting base 41 mounted on the lower bracket 3. The mounting base 41 is fixed to the lower bracket 3 by screws. The top of the mounting base 41 is provided with a mounting shaft 42 rotatably connected to the mounting base 41. The bottom end of the mounting shaft 42 is inserted into the mounting base 41 and rotatably connected to the mounting base 41 by a bearing. A connecting plate 43 is fixed to the upper part of the mounting shaft 42. The connecting plate 43 and the mounting shaft 42 adopt an integral structure. A locking plate 44 is provided above the connecting plate 43. The locking plate 44 has a center hole that adapts to the mounting shaft 42. The locking plate 44 is sleeved on the mounting shaft 42. It can move up and down. The locking disc 44 and the connecting disc 43 are connected by an adjusting screw 45. The turntable 1 is provided with a central mounting hole 12 adapted to the mounting shaft 42 and a first through hole 13 adapted to the adjusting screw 45. A through hole adapted to the adjusting screw 45 can be provided on the locking disc 44, and a screw hole adapted to the adjusting screw 45 can be provided on the connecting disc 43. After the adjusting screw 45 passes through the locking disc 44 and the turntable 1 from top to bottom, it is connected to the screw hole on the connecting disc 43. By adjusting the tightness of the adjusting screw 45, the sealing between the turntable 1 and the lower sealing tube 5 can be ensured.

[0030] Preferably, a pressure plate 62 is fixedly provided on the upper support pipe 61. The pressure plate 62 and the upper support pipe 61 adopt an integral structure. The pressure plate 62 is located on the lower side of the upper bracket 2. The upper bracket 2 is provided with a through hole adapted to the upper support pipe 61. The top end of the upper support pipe 61 extends upward into the through hole and is slidably connected to the through hole. An elastic downward pressing structure is provided between the pressure plate 62 and the upper bracket 2. The elastic downward pressing structure provides downward pressure to the pressure plate 62 to ensure the sealing between the upper sealing pipe 6 and the pressure plate 62.

[0031] Furthermore, the elastic pressing structure includes a plurality of supporting screws 63 and springs 64 sleeved on the supporting screws 63. The upper bracket 2 is provided with a second through hole adapted to the supporting screws 63, and the supporting screws 63 are slidably connected to the second through hole. The bottom end of the supporting screws 63 is mounted on the pressure plate 62, the bottom end of the spring 64 abuts against the pressure plate 62, and the top end abuts against the upper bracket 2.

[0032] Preferably, in order to facilitate turning the turntable, a plurality of levers 14 are evenly provided along the circumference of the turntable 1 on its edge.

[0033] Preferably, the upper and / or lower sides of the turntable 1 are provided with a positioning prompting component 7. The positioning prompting component 7 includes a mounting bracket and a spring plunger 71 vertically pointing towards the turntable 1 on the mounting bracket. The turntable 1 is provided with a plurality of positioning grooves 15 adapted to the spring plunger 71 in a circular array. One or more positioning grooves 15 are arranged on the radial line of the turntable 1 where each vent hole 11 is located. By means of the collision between the spring plunger 71 and the turntable 1, a prompt is provided to indicate whether the vent hole 11 has been rotated into place.

[0034] Preferably, a support member 8 is provided between the upper bracket 2 and the lower bracket 3. Both ends of the support member 8 are provided with threaded posts 81, and nuts are provided on the threaded posts 81. Both the upper bracket 2 and the lower bracket 3 are provided with through holes adapted to the threaded posts 81. The inner diameter of the through holes is smaller than the outer diameter of the support member 8. When the upper bracket 2 and the lower bracket 3 are made of rectangular plates, through holes for installing the support member 8 are provided at the four corners of the upper bracket 2 and the lower bracket 3. By adjusting the nuts on the threaded posts 81, the distance between the upper bracket 2 and the lower bracket 3 can be adjusted, thereby indirectly improving the sealing performance between the turntable 1 and the lower sealing pipe 5 and the upper sealing pipe 6.

[0035] Example 2: As shown in the attached document Figure 5-6 As shown, the present invention is a permeability meter using the nozzle replacement structure described in Embodiment 1. It includes a frame 9, a fan 91 installed in the frame 9, a workbench 92 installed on the top of the frame 9, an air inlet cylinder 93 installed on the workbench 92 and inserted downward into the frame 9, as well as fixtures, a control system, and other structures. This embodiment only improves the nozzle replacement structure of the permeability meter. Other structures can adopt the existing structure of the permeability meter. Specifically, the bottom end of the air inlet cylinder 93 is connected to the upper support pipe 61 through a telescopic pipe 94, and the lower support pipe 51 is connected to the fan 91 through a connecting pipe 95. The frame 9 is provided with a bracket 96 to provide support for the nozzle replacement structure. The front, left, or right side of the frame 9 is provided with an operation window 97 adapted to the turntable 1. A part of the turntable 1 extends outward through the operation window 97. Nozzle markings can also be set on the turntable 1, with one vent hole 11 corresponding to one nozzle marking.

Claims

1. A nozzle replacement structure, characterized in that: Includes a turntable (1), an upper support (2) is provided above the turntable (1), and a lower support (3) is provided below the turntable (1). The turntable (1) is rotatably connected to the lower support (3) through a rotating support (4). The turntable (1) is provided with a number of ventilation holes (11) arranged in a ring array, and the diameter of different ventilation holes (11) is different. A lower sealing pipe (5) is provided at the bottom of the turntable (1). The top end of the lower sealing pipe (5) abuts against the turntable (1), and the bottom end is connected to the lower support pipe (51). The lower support pipe (51) is installed on the lower bracket (3). An upper sealing pipe (6) is provided at the top of the turntable (1). The width of the overlapping part of the projection of the center hole of the upper sealing pipe (6) and the center hole of the lower sealing pipe (5) on the turntable (1) is greater than the diameter of the largest vent hole (11). When the turntable (1) rotates, the vent hole (11) can be rotated to the center hole between the center hole of the upper sealing pipe (6) and the center hole of the lower sealing pipe (5). The bottom end of the upper sealing pipe (6) abuts against the turntable (1), and the top end is connected to the upper support pipe (61). The upper support pipe (61) is installed on the upper bracket (2).

2. The nozzle replacement structure according to claim 1, characterized in that: Both the lower sealing pipe (5) and the upper sealing pipe (6) are polytetrafluoroethylene pipe fittings.

3. The nozzle replacement structure according to claim 1, characterized in that: The centerlines of the lower sealing pipe (5) and the upper sealing pipe (6) coincide, and the distance between the centerlines of the lower sealing pipe (5) and the upper sealing pipe (6) and the centerline of the rotating support (4) is equal to the distance between the centerline of the vent (11) and the centerline of the rotating support (4).

4. The nozzle replacement structure according to claim 1, characterized in that: The rotating support (4) includes a mounting base (41) set on the lower bracket (3). The top of the mounting base (41) is provided with a mounting shaft (42) rotatably connected to the mounting base (41). The upper part of the mounting shaft (42) is provided with a connecting plate (43). A locking plate (44) is provided above the connecting plate (43). The locking plate (44) and the connecting plate (43) are connected by an adjusting screw (45). The turntable (1) is provided with a central mounting hole (12) adapted to the mounting shaft (42) and a first through hole (13) adapted to the adjusting screw (45).

5. The nozzle replacement structure according to claim 1, characterized in that: The upper support tube (61) is provided with a pressure plate (62), the pressure plate (62) is located on the lower side of the upper bracket (2), the upper bracket (2) is provided with a through hole adapted to the upper support tube (61), the top end of the upper support tube (61) extends upward into the through hole and is slidably connected to the through hole, and an elastic pressing structure is provided between the pressure plate (62) and the upper bracket (2).

6. The nozzle replacement structure according to claim 5, characterized in that: The elastic pressing structure includes several support screws (63) and springs (64) sleeved on the support screws (63). The upper bracket (2) is provided with a second through hole adapted to the support screws (63), and the support screws (63) are slidably connected to the second through hole. The bottom end of the support screws (63) is mounted on the pressure plate (62), the bottom end of the spring (64) abuts against the pressure plate (62), and the top end abuts against the upper bracket (2).

7. The nozzle replacement structure according to claim 1, characterized in that: The turntable (1) has several levers (14) evenly arranged along its circumference.

8. The nozzle replacement structure according to claim 1, characterized in that: The turntable (1) is provided with a positioning prompting component (7) on its upper and / or lower sides. The positioning prompting component (7) is provided with a spring plunger (71) pointing vertically to the turntable (1). The turntable (1) is provided with a number of positioning grooves (15) in a circular array that are adapted to the spring plunger (71). One or more positioning grooves (15) are arranged on the radial line of the turntable (1) where each vent (11) is located.

9. A nozzle replacement structure according to claim 1, characterized in that: A support member (8) is provided between the upper support (2) and the lower support (3), and threaded posts (81) are provided at both the upper and lower ends of the support member (8).

10. A permeability meter employing the nozzle replacement structure according to any one of claims 1-9, comprising a frame (9), a fan (91) disposed within the frame (9), a worktable (92) disposed at the top of the frame (9), and an air inlet cylinder (93) disposed on the worktable (92) and inserted downward into the frame (9), characterized in that: The bottom end of the air inlet cylinder (93) is connected to the upper support pipe (61) through the telescopic pipe (94), and the lower support pipe (51) is connected to the fan (91) through the connecting pipe (95). The frame (9) is provided with a bracket (96) to provide support for the nozzle replacement structure. The front, left or right side of the frame (9) is provided with an operation window (97) adapted to the turntable (1).

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