JPH0122116Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a diaphragm testing machine for testing the durability of a diaphragm.

Conventionally, when testing the operational durability of a diaphragm, a testing machine using a vane pump or a vacuum pump as a positive and negative pressure supply source has been used. However, in this type of testing machine, the capacity of the pump cannot be set very large due to its structure, so the number of diaphragms that can be tested simultaneously with one testing machine is small, and even with one diaphragm, it is difficult to increase the capacity of the pump. There are problems with diaphragms that cannot be tested. For this reason, testing machines with a large capacity that utilize engine motoring have been developed, but in this type of testing machine, oil mist is blown into the piping by a piston inserted into the cylinder. There is a drawback that the membrane surface of the diaphragm becomes wet because of the moisture content, and testing can only be carried out under limited conditions that allow the membrane surface to become wet.

In view of the above points, the present invention provides a diaphragm testing machine that can simultaneously test a large number of diaphragms and large-capacity diaphragms without wetting the membrane surface of the diaphragm with oil mist. With the goal. Another object of the present invention is to provide a diaphragm testing machine that is equipped with a function to arbitrarily adjust the amplitude of the pulsation of positive and negative pressure applied to the diaphragm, the center value of the amplitude, etc., and is capable of setting a variety of conditions. It is in.

In order to achieve the above object, the diaphragm tester of the present invention has a diaphragm fixture that airtightly holds the diaphragm under test and constitutes a diaphragm chamber inside, and a diaphragm fixture that is attached to the diaphragm fixture to detect the pressure in the diaphragm chamber. a blower driven by a motor and having a positive pressure source on its air discharge side and a negative pressure source on its air suction side; and an output port connected to the diaphragm chamber. ,
a switching valve having a positive pressure side input port connected to the positive pressure source and a negative pressure side input port connected to the negative pressure source, and operated by a variable speed motor to switch between the two input ports; , a flow control valve installed in the middle of a conduit connecting the output port and the diaphragm chamber; two sub-path conduits connecting the conduit and a positive pressure source, and the conduit and a negative pressure source, respectively; It is characterized by a flow control valve installed in the middle of each sub-path conduit.

The diaphragm tester of the present invention having the above configuration uses a blower, which has a larger capacity than a vane pump or a vacuum pump, as a source of positive and negative pressure, and the blower and the diaphragm chamber are connected via a switching valve. A large absolute value of pressure can be applied to diaphragms and large, large-capacity diaphragms. This pressure, that is, the amplitude of the pulsation, can be adjusted by operating the flow rate adjustment valve interposed between the output port of the switching valve and the diaphragm chamber, and the amplitude of the pulsation can be adjusted by operating the flow rate adjustment valve installed in the secondary conduit. The center value can be adjusted. Furthermore, the period of pulsation can be adjusted by controlling the speed of the variable speed motor that operates the switching valve.

Next, embodiments of the present invention will be described with reference to the drawings.

Reference numeral 1 indicates a blower that operates as a source of positive and negative pressure. The blower 1 is rotationally driven by a motor 2, and constitutes a positive pressure source 3 on the side that discharges air, and a negative pressure source 3 on the side that sucks in air. It constitutes a pressure source 4. The positive pressure source 3 and the negative pressure source 4 are connected to a conduit 5,
6 to the input ports 8 and 9 of the positive/negative pressure switching valve 7, and a conduit 11 extending from the output port 10 of the switching valve 7 is connected to the branch pipes 14 of the test section 13 via the flow control valve 12. It is connected. The positive and negative pressure switching valve 7 is operated by a variable speed motor 15 to alternately and periodically connect two input ports 8 and 9 to one output port 10. By controlling the speed of 15, the switching period can be changed. The conduit 11 and the positive pressure source 3 and the conduit 11 and the negative pressure source 4 are each connected to one auxiliary conduit 1.
6, 17, each secondary conduit 16, 1
One flow control valve 18, 19 is installed in the middle of 7. The test section 13 is provided with a plurality of diaphragm fixtures 20 .
Each fixture 20 fixes and holds one diaphragm a airtightly and removably, and when the diaphragm a is fixed, there is a diaphragm chamber 2 surrounded by the diaphragm a and the fixture 20 inside.
1. The diaphragm chamber 21 is connected to the branch pipe 1.
4, and the fixture 20 has a diaphragm chamber 2.
A pressure sensor 22 for detecting the pressure of 1 is attached.

The diaphragm testing machine having the above configuration tests the durability of a diaphragm a of a specific specification, for example, as to how long the diaphragm a can operate without breaking in response to a specific pulsation, and during the test, the diaphragm a When the diaphragm a breaks, the diaphragm chamber 21 is opened to the atmosphere and the pressure sensor 22 cannot detect pulsation. Therefore, the durability of the diaphragm a can be determined by measuring the time from the start of the test until the diaphragm a breaks.

Regarding the type of pulsation to be applied to the diaphragm a under test, it would be convenient and necessary to be able to vary the pulsation depending on the specifications of the diaphragm a, that is, the shape, material, size, etc. of the diaphragm a. In this regard, the diaphragm testing machine described above has the following functions. That is, first, the amplitude of the pulsation is adjusted by controlling the flow rate of air by operating the flow rate adjustment valve 7 installed midway through the conduit 11 that connects the output port 10 of the positive/negative pressure switching valve 7 and the diaphragm chamber 21. I can do it. Second, the center value of the amplitude of the pulsation can be adjusted by applying boost pressure by operating the flow control valves 18 and 19 installed in each of the sub-path conduits 16 and 17. The flow rate adjustment valve 18 connected to the positive pressure source 3 is responsible for adjustment to the positive pressure side, and the flow rate adjustment valve 19 connected to the negative pressure source 4 is responsible for adjustment to the negative pressure side. Thirdly, by controlling the speed of the variable speed motor 15 that operates the positive/negative pressure switching valve 7, the period of pulsation can be adjusted. The above-mentioned testing machine creates a desired pulsation in this manner and applies the pulsation to the diaphragm a, and is capable of testing the durability of the diaphragm a under a variety of conditions.

The blower 1, which operates as a source of positive and negative pressure, can have a larger capacity than conventional vane pumps or vacuum pumps. Capacitive diaphragm a can be tested. The blower 1 is clean and does not contain air-oil mist discharged from the blower 1, and can eliminate the conventional disadvantage that the membrane surface of the diaphragm a becomes wet.

As explained above, the diaphragm testing machine of the present invention uses a blower with a relatively large capacity as a source of positive and negative pressure, making it possible to test multiple diaphragms at the same time, and to test large and large-capacity diaphragms. It is particularly useful as a testing machine for reliability analysis of diaphragms through durability tests that require simultaneous testing of a large number of diaphragms. The air discharged from the blower is clean, and it is possible to eliminate the conventional inconvenience in which the membrane surface of the diaphragm becomes wet with oil mist and the test conditions change. In addition, the diaphragm testing machine of the present invention has a pulsation adjustment function to create the desired pulsation, and a variety of test conditions can be set, so a single testing machine can meet a wide range of needs.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing the structure of a dial tester according to an embodiment of the present invention. 1...Blower, 2...Motor, 3...Positive pressure source,
4... Negative pressure source, 5, 6, 11... Conduit, 7... Positive/negative pressure switching valve, 8, 9... Input port, 10... Output port, 12, 18, 19... Flow rate adjustment valve, 13 ... Testing section, 14 ... Branch pipe, 15 ... Variable speed motor, 16, 17 ... Secondary conduit, 20 ...
Diaphragm fixture, 21... diaphragm chamber,
22...Pressure sensor, a...Diaphragm.

Claims (1)

[Claims for Utility Model Registration] A diaphragm fixture 20 that airtightly holds the diaphragm a under test and configures a diaphragm chamber 21 inside; and a diaphragm fixture 20 that is attached to the diaphragm fixture 20 to detect the pressure in the diaphragm chamber 21. a blower 1 driven by a motor 2 and having a positive pressure source 3 on its air discharge side and a negative pressure source 4 on its air suction side; and the diaphragm chamber 21. , an input port 8 on the positive pressure side connected to the positive pressure source 3 , and an input port 9 on the negative pressure side connected to the negative pressure source 4 . a switching valve 7 operated to switch between two input ports 8 and 9; a flow rate control valve 12 installed midway through a conduit 11 connecting the output port 10 and the diaphragm chamber 21; and a positive pressure source between the conduit 11 and the diaphragm chamber 21. 3, and the conduit 11
and a negative pressure source 4, respectively, and flow rate control valves 18, 19 installed in the middle of each of the sub-path conduits 16, 17.