Device for testing effective area of rubber diaphragm

Abstract

The invention relates to a device for testing the effective area of a rubber diaphragm, the device is composed of a shell, a cover plate and the rubber diaphragm, the shell is provided with a threaded hole, the threaded hole is provided with an internal thread, the shell is internally provided with an annular groove, the rubber diaphragm is placed in the annular groove, the cover plate is provided with a screw hole and a step, and the step is provided with an internal thread. The rubber diaphragm is pressed in the annular groove through the step, and a screw penetrates through the screw hole and is connected with the threaded hole, so that the rubber diaphragm is fixed. The weight is placed on the upper surface of the rubber diaphragm, the rubber diaphragm is sunken downwards under the action of gravity, the air source enters the containing cavity through the air source channel of the shell and acts on the pressure sensing face of the rubber diaphragm, the rubber diaphragm senses pressure and deforms upwards, the sunken part disappears gradually, and the effective area of the rubber diaphragm can be calculated through the testing method.

Description

Technical Field

[0001] The invention relates to the field of aviation and aerospace, and in particular to a device for testing the effective area of ​​a rubber diaphragm. Background Art

[0002] The formula for the effective area of ​​a rubber diaphragm can only calculate theoretical values. Since rubber diaphragms have certain differences in production and processing, the calculation of the effective area of ​​the rubber diaphragm is inaccurate.

[0003] In order to obtain the actual effective area of ​​the rubber diaphragm, it must be tested by an experimental method and then calculated. Therefore, it is urgent to design a device for testing the effective area of ​​the rubber diaphragm to accurately obtain the actual effective area of ​​the rubber diaphragm. Summary of the invention

[0004] The present invention is a device for testing the effective area of ​​a rubber diaphragm. By placing a weight on the placement surface of the rubber diaphragm, the rubber diaphragm is depressed downward by gravity, and an air source enters a cavity through an air source channel of a shell and acts on a pressure-sensitive surface of the rubber diaphragm. The rubber diaphragm senses the pressure and deforms upward, gradually offsetting the downward depression of the rubber diaphragm. Through this testing method, the effective area of ​​the rubber diaphragm can be calculated.

[0005] The present invention provides a device for testing the effective area of ​​a rubber diaphragm, the device comprising: a housing, a cover plate, a weight and an air source; the housing comprises: a nozzle and an air source channel;

[0006] The shell is barrel-shaped, with an annular groove on the top end surface, the cover plate is annular, with a step on the bottom surface of the cover plate, the rubber diaphragm is placed in the annular groove, the step of the cover plate is placed on the rubber diaphragm, and is clamped in the annular groove;

[0007] A nozzle is arranged at the bottom of the shell, and a gas source channel is arranged at the center of the nozzle;

[0008] A weight is placed above the rubber diaphragm to cause the rubber diaphragm to be concave downward by gravity. The gas generated by the air source is injected into the shell through the air source channel to restore the rubber diaphragm. When the rubber diaphragm returns to its original position, the gas pressure injected by the air source and the mass of the weight are used to indicate the effective area of ​​the rubber diaphragm.

[0009] Optionally, the nozzle is processed with external threads, and the external threads are used to connect to the air source device.

[0010] Optionally, a flange is provided on the upper end surface of the shell;

[0011] The outer diameter of the flange is consistent with the outer diameter of the cover plate. The flange is provided with threaded holes, the cover plate is provided with screw holes, and the flange and the cover plate are connected by screws.

[0012] Optionally, the number of threaded holes and the number of screw holes are evenly distributed in four.

[0013] Optionally, the rubber diaphragm includes a pressure-sensitive surface and a placement surface;

[0014] The placement surface of the rubber diaphragm is placed upwards for contacting the weight, and the pressure-sensing surface is placed downwards for sensing the air pressure of the air source.

[0015] Optionally, the effective area of ​​the rubber diaphragm is obtained by using the formula P=F / S according to the gas pressure injected by the gas source and the mass of the weight when the rubber diaphragm returns to its original position;

[0016] Wherein F is the weight of the weight, which is obtained according to the mass of the weight; P is the gas pressure injected by the gas source when the rubber diaphragm returns to its original position, and S is the effective area of ​​the rubber diaphragm.

[0017] Optionally, the outer diameter of the step is not greater than the inner diameter of the annular groove.

[0018] Optionally, the sum of the height of the step and the thickness of the rubber diaphragm is not less than the depth of the annular groove.

[0019] Optionally, the weight is arranged at the hard center of the rubber diaphragm.

[0020] The working principle of the present invention is: firstly, the rubber diaphragm is placed in the annular groove, then the cover plate step is aligned with the annular groove, the diaphragm flange edge is pressed, the cover plate is rotated, and the screw holes on the cover plate are ensured to be aligned one by one with the threaded holes on the shell. At this time, the screws are passed through the screw holes and screwed into the threaded holes to fix the cover plate while further pressing the rubber diaphragm flange edge. Finally, the device is vertically installed on the gas source device through the external thread on the shell, and a certain weight is placed on the rubber diaphragm placement surface. The rubber diaphragm is then concave downward, and the gas source valve is opened. Oxygen passes through the gas source channel and enters the shell cavity, acting on the rubber diaphragm pressure-sensitive surface. As the pressure in the cavity continues to increase, the force acting on the pressure-sensitive surface continues to increase, and the degree of concavity of the rubber diaphragm gradually decreases. When the force increases to a certain extent, the rubber diaphragm returns to its original position, and the effective area value of the diaphragm can be obtained by calculation. The device provided by the present invention can effectively measure the effective area of ​​the rubber diaphragm, providing an effective reference for the design of the rubber diaphragm. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0022] Figure 1 It is a schematic diagram of the structure of a device for testing the effective area of ​​a rubber diaphragm;

[0023] Description of reference numerals:

[0024] 1- nozzle, 2- air source channel, 3- external thread, 4- shell, 5- cavity, 6- annular groove, 7- threaded hole, 8- screw hole, 9- step, 10- rubber diaphragm, 11- through hole, 12- cover plate, 13- pressure sensing surface, 14- placement surface. DETAILED DESCRIPTION

[0025] In order to make the purpose and advantages of the present invention more clearly understood, the present invention is specifically described below in conjunction with the embodiments. The following text is only used to describe one or several specific implementations of the present invention, and does not strictly limit the protection scope of the specific claims of the present invention.

[0026] The device for testing the effective area of ​​a rubber diaphragm provided by the present invention is explained below in conjunction with the accompanying drawings.

[0027] like Figure 1 As shown, the present invention provides a device for testing the effective area of ​​a rubber diaphragm, wherein the device is composed of a housing 4 , a cover plate 12 and a rubber diaphragm 10 .

[0028] Furthermore, a nozzle 1 and a threaded hole 7 are processed on the shell 4 , and an air source channel 2 , a cavity 5 and an annular groove 6 are processed inside the shell 4 .

[0029] Furthermore, the nozzle 1 is processed with an external thread 3, and the external thread 3 is used to connect to the air source device.

[0030] Furthermore, the rubber diaphragm 10 is placed in the annular groove 6 to prevent the rubber diaphragm 10 from being displaced during installation or operation.

[0031] Furthermore, the cover plate 12 is processed with a step 9 , a through hole 11 and a screw hole 8 .

[0032] Furthermore, the through hole 11 passes through the rubber diaphragm 10 and presses the rubber diaphragm 10 onto the annular groove 6 through the step 9 .

[0033] Furthermore, the screw passes through the screw hole 8 and is screwed into the screw hole 8 to fix the rubber diaphragm 10 and prevent the rubber diaphragm from moving in the annular groove 6 .

[0034] First, place the rubber diaphragm with an outer diameter of 52mm in an annular groove with a diameter of 53mm, then align the step of the hard aluminum cover plate with an outer diameter of 65mm with the annular groove, press the flange edge of the rubber diaphragm, rotate the cover plate, and ensure that the screw holes on the cover plate are aligned one by one with the threaded holes on the shell. The shell material is hard aluminum with an outer diameter of 65mm. At this time, pass the screws through the screw holes and screw them into the threaded holes to fix the cover plate on the shell. At the same time, further press the flange edge of the rubber diaphragm. Finally, install the device vertically on the gas source device through the external thread on the shell. The outer diameter of the thread is 14mm. Place a certain weight of weight on the placement surface of the rubber diaphragm. The placement surface diameter is 38mm, and the rubber diaphragm is concave downward. Open the gas source valve, and oxygen enters the shell cavity through the gas source channel with a diameter of 4mm. The cavity volume is 24429mm 3 , acting on the pressure-sensitive surface of the rubber diaphragm, the diameter of the pressure-sensitive surface is 48mm. As the pressure in the cavity continues to increase, the force acting on the pressure-sensitive surface continues to increase, and the degree of depression of the rubber diaphragm gradually decreases. When the force increases to a certain extent, the rubber diaphragm returns to its original position. At this time, record the mass of the weight and the air source pressure value. Through the above measurement method, measure several groups of data. After the measurement is completed, close the air source valve and remove the device. The effective area value of the rubber diaphragm can be calculated through the measured data.

[0035] For example, when a weight of 6.17g is placed on the rubber diaphragm surface, a pressure of 0.03kpa is required to restore the rubber diaphragm to its initial position without the weight. The effective area of ​​the rubber diaphragm is calculated to be 2015.5mm by S=F / P. 2 .

[0036] The above is only a preferred embodiment of the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made without departing from the principles of the present invention, and these improvements and modifications should also be considered as the protection scope of the present invention. The structures, devices and operating methods not specifically described and explained in the present invention shall be implemented according to the conventional means in the art unless otherwise specified and limited.

Claims

1. A device for testing the effective area of ​​a rubber diaphragm, characterized in that: The device comprises: a shell, a cover plate, a weight and an air source; the shell comprises: a nozzle and an air source channel; The shell is barrel-shaped, with an annular groove on the top end surface, the cover plate is annular, with a step on the bottom surface of the cover plate, the rubber diaphragm is placed in the annular groove, the step of the cover plate is placed on the rubber diaphragm, and is clamped in the annular groove; A nozzle is arranged at the bottom of the shell, and a gas source channel is arranged at the center of the nozzle; A weight is placed above the rubber diaphragm to cause the rubber diaphragm to be concave downward by gravity. The gas generated by the air source is injected into the shell through the air source channel to restore the rubber diaphragm. When the rubber diaphragm returns to its original position, the gas pressure injected by the air source and the mass of the weight are used to indicate the effective area of ​​the rubber diaphragm.

2. The device for testing the effective area of ​​a rubber diaphragm according to claim 1, characterized in that: The nozzle is processed with external threads, and the external threads are used to connect to the air source device.

3. The device for testing the effective area of ​​a rubber diaphragm according to claim 1, characterized in that: The upper end surface of the shell is provided with a flange; The outer diameter of the flange is consistent with the outer diameter of the cover plate. The flange is provided with threaded holes, the cover plate is provided with screw holes, and the flange and the cover plate are connected by screws.

4. The device for testing the effective area of ​​a rubber diaphragm according to claim 3, characterized in that: The threaded holes and screw holes are evenly distributed in four.

5. The device for testing the effective area of ​​a rubber diaphragm according to claim 1, characterized in that: The rubber diaphragm comprises a pressure-sensitive surface and a placement surface; The placement surface of the rubber diaphragm is placed upwards for contacting the weight, and the pressure-sensing surface is placed downwards for sensing the air pressure of the air source.

6. The device for testing the effective area of ​​a rubber diaphragm according to claim 1, characterized in that: The effective area of ​​the rubber diaphragm is obtained by the formula P = F / S according to the gas pressure injected by the gas source and the mass of the weight when the rubber diaphragm returns to its original position; Wherein F is the weight of the weight, which is obtained according to the mass of the weight; P is the gas pressure injected by the gas source when the rubber diaphragm returns to its original position, and S is the effective area of ​​the rubber diaphragm.

7. The device for testing the effective area of ​​a rubber diaphragm according to claim 1, characterized in that: The outer diameter of the step is not greater than the inner diameter of the annular groove.

8. The device for testing the effective area of ​​a rubber diaphragm according to claim 1, characterized in that: The sum of the height of the step and the thickness of the rubber diaphragm is not less than the depth of the annular groove.

9. The device for testing the effective area of ​​a rubber diaphragm according to claim 1, characterized in that: The weight is set at the hard center of the rubber diaphragm.

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