Fixture for assisting air tightness detection of oxygen generator

Abstract

The clamp comprises an upper pressing plate, a lower pressing plate and a connecting column, the upper pressing plate is provided with a channel for the connecting column to move and a limiting groove, and one side, close to the upper pressing plate, of the lower pressing plate is provided with an arc-shaped groove. The side, away from the upper pressing plate, of the lower pressing plate is provided with a plurality of sealing pieces used for sealing an airtight part cavity connected with a rotary valve of the oxygen generator, the lower pressing plate and the upper pressing plate are connected so that the limiting groove and the arc-shaped groove can communicate with each other to form a movable cavity, and the first end of the connecting column is provided with a curved surface contact head matched with the arc-shaped groove. The second end of the connecting column extends out of the upper pressing plate, a movable gap is reserved between the outer side of the connecting column and the channel, rotation of the lower pressing plate is achieved through curved surface matching adjustment between the curved surface contact head of the connecting column and the arc-shaped groove of the lower pressing plate, and then automatic leveling of the lower pressing plate and the airtight part is completed. The clamp can reduce the gap between the end face of the clamp and the binding face of the airtight part, and meets the requirement of airtight detection.

Description

Technical Field

[0001] The utility model belongs to the technical field of clamps, and in particular relates to a clamp used for air tightness detection of an auxiliary oxygen concentrator. Background Art

[0002] The small rotary valve in an oxygen concentrator typically doesn't use a mechanical connection to the contact surface with the airtight component. Instead, the valve and the airtight component are connected through pneumatic balancing. Existing airtightness testing equipment often uses a mechanical connection to attach a fixture to the airtight component. The fixture's end plug is usually fixed in a vertical direction. Conventional fixtures are limited by factors such as the precision and shape of the airtight component, making it difficult to ensure the contact surface between the fixture and the airtight component is completely horizontal. This results in an inconsistent distance between the fixture and the airtight component, making it difficult for the contact surface to be completely aligned, making it impossible to meet the airtightness test requirements and causing the overall airtightness test to fail. Utility Model Content

[0003] The purpose of the present utility model is to solve at least one problem of the prior art and to provide a clamp for auxiliary oxygen concentrator air tightness detection.

[0004] To achieve the above-mentioned purpose, the utility model proposes a fixture for auxiliary oxygen concentrator air tightness detection, including an upper pressure plate, a lower pressure plate and a connecting column, the upper pressure plate is provided with a channel and a limit groove for the connection column to move, the lower pressure plate is provided with an arc groove on the side close to the upper pressure plate, and the lower pressure plate is provided with a plurality of seals for sealing the airtight part cavity connected to the rotary valve of the oxygen concentrator on the side away from the upper pressure plate, the lower pressure plate and the upper pressure plate are connected so that the limit groove and the arc groove are connected to each other to form an active cavity, the first end of the connecting column is provided with a curved contact head adapted to the arc groove, the second end of the connecting column extends out of the upper pressure plate, and a movable gap is left between the outer side of the connecting column and the channel, the rotation of the lower pressure plate is realized by adjusting the curved surface between the curved contact head of the connecting column and the arc groove of the lower pressure plate, thereby completing the automatic leveling of the lower pressure plate and the airtight part.

[0005] Preferably, the upper pressing plate and the lower pressing plate are parallel to each other and connected by fasteners.

[0006] Preferably, the upper pressing plate, the lower pressing plate and the connecting column are all made of stainless steel.

[0007] Preferably, the connecting column is provided with a threaded section near the outer side of the second end and is screwed with a nut, and the maximum diameter of the threaded section is smaller than the diameter of other positions of the connecting column.

[0008] Preferably, the connecting column is connected to the lifting plate, the lifting plate is connected to the lifting control device, and its up and down movement is controlled by the lifting control device.

[0009] Preferably, the lifting control device is a linear module, and the lifting plate is connected to a slide or a slide seat of the linear module.

[0010] The beneficial effects of the present invention are as follows: the present invention provides a curved contact head on the connecting column of the clamp, and an arc groove on the lower pressure plate of the clamp. The curved contact head and the arc groove contact each other and are slidably connected, so that when the lower pressure plate contacts an uneven airtight part, the curved contact head slides along the arc groove so that the lower pressure plate can be rotated and adjusted slightly, thereby realizing automatic leveling between the contact surface of the lower pressure plate and the airtight part, simulating the working condition of the contact between the airtight part and the rotary valve, reducing the gap between the end face of the clamp and the fitting surface of the airtight part, and avoiding the occurrence of unqualified airtightness detection due to excessive contact surface gap.

[0011] The features and advantages of the present invention will be described in detail through embodiments with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0013] Figure 2 It is a front view of an embodiment of the present utility model.

[0014] Figure 3 It is a front cross-sectional view of an embodiment of the utility model.

[0015] Figure 4 It is a principle diagram of air tightness test of an embodiment of the present utility model.

[0016] Figure 5 It is a schematic diagram of the airtightness test state of an embodiment of the present utility model.

[0017] In the figure: 1-upper pressing plate, 2-lower pressing plate, 3-connecting column, 4-sealing member, 5-part to be tested, 6-limiting fixture, 7-locking mechanism, 10-channel, 11-limiting groove, 21-arc groove. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations. In the description of the present application, it should be noted that the orientation or position relationship indicated by the terms "inside" and "outside" is based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the product of the application is usually placed when in use. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0019] It should also be noted that, in the description of this application, unless otherwise expressly specified or limited, the terms "disposed" and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0020] The present invention will be described in detail below with reference to the accompanying drawings.

[0021] See Figure 1 、 Figure 2 、 Figure 3 The present embodiment provides a fixture for air tightness detection of the rotary valve of an auxiliary oxygen concentrator, comprising an upper pressing plate 1, a lower pressing plate 2 and a connecting column 3. The upper pressing plate 1 is provided with a channel 10 and a limiting groove 11 for the connecting column 3 to move. The lower pressing plate 2 is provided with an arc groove 21 on the side close to the upper pressing plate 1, and a plurality of sealing members 4 for sealing the airtight part cavity are provided on the side of the lower pressing plate 2 away from the upper pressing plate 3. The lower pressing plate 2 and the upper pressing plate 1 are connected so that the limiting groove 11 and the arc groove 21 are connected to each other to form an active cavity, and the active cavity is connected to the channel 10. The first end of the connecting column 3 is provided with a curved contact head adapted to the arc groove 21, and the second end of the connecting column 3 extends out of the upper pressing plate 1, and an active gap is left between the outer side of the connecting column 3 and the channel 10. The rotation of the lower pressing plate 2 is achieved by adjusting the curved surface between the curved contact head of the connecting column 3 and the arc groove 21 of the lower pressing plate 2, thereby completing the automatic leveling of the lower pressing plate 2 and the airtight part.

[0022] In actual use, the number of sealing members 4 is the same as the number of airtight part cavities and corresponds one to one. The first end of the connecting column 3 passes through the channel 10. The curved contact head contacts the arc groove 21 and can slide along the curved surface of the arc groove 21 so that the curved contact head rotates slightly in the active cavity. The maximum diameter of the curved contact head is greater than the diameter of the channel 10 to ensure that the connecting column 3 and the curved contact head will not fall off during operation. The airtight part is the part to be tested 5.

[0023] In this embodiment, the upper pressing plate 1 and the lower pressing plate 2 are parallel and connected by fasteners, which include but are not limited to screws and pins, so that the two can be easily assembled and disassembled.

[0024] In this embodiment, the upper pressing plate 1 , the lower pressing plate 2 and the connecting pillars 3 are all made of stainless steel.

[0025] In this embodiment, a threaded section is provided near the outer side of the second end of the connecting column 3 and is screwed with a nut. The maximum diameter of the threaded section is smaller than the diameter of other positions of the connecting column 3, which facilitates the installation and fixation of the connecting column 3 and other parts such as the lifting plate.

[0026] In this embodiment, the connecting column 3 is connected to the lifting plate, and the lifting plate is connected to the lifting control device, and its up and down movement is controlled by the lifting control device to realize automatic lifting control of the lifting plate and the clamp, so as to automatically seal the cavity of the airtight part.

[0027] During specific use, the lifting control device is a linear module, and the lifting plate is connected to the slide or slide seat of the linear module.

[0028] Working process of this utility model:

[0029] See Figure 4 and Figure 5 During the working process, the fixture places the oxygen concentrator part 5 to be tested on the limit fixture 6 (corresponding to Figure 4 The positioning column of the limit fixture 6 is connected to the air inlet of the lower end of the part to be tested 5 of the oxygen concentrator by a gas pipe, and the pressure monitoring equipment is connected to the air compressor by a gas pipe. The air outlet of the upper end of the part to be tested 5 fits with the fixture of this application. When performing air tightness testing, the locking mechanism 7 is used to lock the plug fixture 6 and the fixture of this application (corresponding to Figure 4The upper end face of the fixture in the test) is respectively pressed against the upper and lower ends of the part to be tested 5, and the sealing member 4 at the bottom of the lower pressure plate 2 seals the cavity of the part to be tested. The air is supplied by the air compressor, and the gas passes through the gas pressure detection equipment and the limit fixture 6 to enter the part to be tested 5. When the air pressure in the cavity inside the part to be tested 5 reaches the preset value, the air supply valve of the pressure monitoring device is closed, and the air tightness of the part to be tested 5 is judged according to the air pressure drop value of the rotary valve per unit time. Among them, when the locking mechanism 7 is used to press the plug fixture 6 and the fixture of the present application respectively against the upper and lower ends of the part to be tested 5 When one side of the part to be tested 5 is not parallel to the lower end surface after being tightly fixed due to problems with the shape or part processing, the lower pressure plate of the fixture of the present application can compensate by self-leveling, so that the locking mechanism can normally lock the oxygen concentrator part to be tested 5. At this time, the air tightness of the oxygen concentrator part to be tested 5 is tested by the pressure drop method, and the result is much better than that of the fixture without a compensation structure. While the overall test result is more realistic, it also better simulates the state of the upper end of the part to be tested 5 in contact with the rotary valve in the working state. The locking mechanism 7 is an existing structure.

[0030] During the process of moving the lower pressure plate 2 and the sealing member 4 downward to seal the airtight part, they are automatically leveled according to the concave and convex conditions on the surface of the airtight part, thereby achieving complete fit between the lower pressure plate and the airtight part. The air compressor supplies air to the part to be tested 5, and the pressure monitoring equipment is used to test the changes in pipeline pressure to judge the airtightness of the oxygen concentrator part to be tested 5. The specific principle of automatic leveling is that the raised position of the airtight part will squeeze the lower pressure plate 2 so that the curved contact head on the connecting column 3 and the curved surface of the arc groove 21 on the lower pressure plate 2 slide against each other, causing the lower pressure plate 2 to rotate slightly, so that the lower pressure plate 2 and the airtight part can be completely fitted.

[0031] The above embodiments are intended to illustrate the present invention, not to limit the present invention. Any solution that is a simple transformation of the present invention falls within the scope of protection of the present invention.

Claims

1. A fixture for auxiliary oxygen concentrator air tightness detection, characterized by: The invention comprises an upper pressing plate, a lower pressing plate and a connecting column, wherein the upper pressing plate is provided with a channel and a limit groove for the movement of the connecting column, the side of the lower pressing plate close to the upper pressing plate is provided with an arc groove, and the side of the lower pressing plate away from the upper pressing plate is provided with several sealing members, the lower pressing plate and the upper pressing plate are connected so that the limit groove and the arc groove are connected with each other to form an active cavity, the first end of the connecting column is provided with a curved contact head adapted to the arc groove, the second end of the connecting column extends out of the upper pressing plate, and a movable gap is left between the outer side of the connecting column and the channel, and the rotation of the lower pressing plate is realized by adjusting the curved surface between the curved contact head of the connecting column and the arc groove of the lower pressing plate, thereby completing the automatic leveling of the lower pressing plate and the airtight parts.

2. The fixture for air tightness detection of an auxiliary oxygen concentrator according to claim 1, characterized in that: The upper pressing plate and the lower pressing plate are parallel to each other and connected by fasteners.

3. The fixture for air tightness detection of an auxiliary oxygen concentrator according to claim 1, characterized in that: The upper pressing plate, the lower pressing plate and the connecting column are all made of stainless steel.

4. The fixture for air tightness detection of an auxiliary oxygen concentrator according to claim 1, characterized in that: The connecting column is provided with a threaded section near the outer side of the second end and is screwed with a nut. The maximum diameter of the threaded section is smaller than the diameter of other positions of the connecting column.

5. The fixture for air tightness detection of an auxiliary oxygen concentrator according to claim 1, characterized in that: The connecting column is connected to the lifting plate, and the lifting plate is connected to the lifting control device, and is controlled to move up and down by the lifting control device.

6. The fixture for detecting air tightness of an auxiliary oxygen concentrator according to claim 5, characterized in that: The lifting control device is a linear module, and the lifting plate is connected to the slide table or slide seat of the linear module.

Images