JP2019100893A - Leakage testing device - Google Patents

Abstract

To prevent seal rubber from being pealed from a plate when separating a work from the plate.SOLUTION: A leakage testing device includes a plate that forms a groove and blocks an opening of a work, and seal rubber that is fitted into the groove of the plate and pressure-welds a peripheral part of the opening when the plate blocks the opening, supplies fluid to the inside of the work blocked by the plate, and detects leakage of the fluid from the inside of the work. The leakage testing device allows an intake passage communicating with the groove to be formed in the plate, and includes a suction device that is connected with the intake passage and sucks gas within the intake passage when separating the work from the plate.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a leak test apparatus.

  The leak test device presses and seals the opening of the work with a plate and supplies the fluid to the inside of the sealed work, and detects the leak of the fluid from the inside of the work. It is a device that inspects sealability. The leak test apparatus is also used, for example, when inspecting the sealability of a cylinder block in a production line of an engine of an automobile factory.

  For example, in the leak test device of Patent Document 1, a seal rubber is embedded in a groove provided on the surface of a plate, and the seal rubber is in close contact with the periphery of the opening of the work to seal the inside of the work.

JP, 2015-175740, A

  After completion of the leak test, the work is separated (unclamped) from the plate, but at this time, the seal rubber may stick to the work and be separated from the plate. If the seal rubber is peeled off, the seal rubber will be crushed between the plate and the work when the leak test is performed next, or the inside of the work can not be sufficiently sealed, and the correct inspection result can not be obtained. There is a fear.

  Therefore, the leak test device disclosed in the present specification has an object to prevent the seal rubber from coming off from the plate when separating the work and the plate.

  In order to solve such problems, the leak test device disclosed in the present specification has a groove, and a plate that closes an opening of a work, and the groove that fits in the groove of the plate, and the plate opens the opening A sealing rubber pressed against the peripheral portion of the opening when the unit is closed, supplying a fluid to the inside of the workpiece sealed by the plate, and detecting a leak of the fluid from the inside of the workpiece In the leak test apparatus, an intake passage communicating with the groove is formed in the plate, connected to the intake passage, and the gas in the intake passage is sucked when the work and the plate are separated. Provided with a suction device.

  According to the leak test device disclosed in the present specification, it is possible to prevent the seal rubber from coming off from the plate when separating the work and the plate.

Fig.1 (a) is sectional drawing which shows the structure of the leak test apparatus which concerns on embodiment, FIG.1 (b) is sectional drawing of the AA line of Fig.1 (a). Fig.2 (a) is a top view which shows the structure of the plate with which a leak test apparatus is equipped, FIG.2 (b) is a top view of the plate which removed sealing rubber, FIG.2 (c) removes sealing rubber. FIG. 18 is a plan view of another example of the plate.

  Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. However, in the drawings, the dimensions, proportions, etc. of each part may not be illustrated so as to completely correspond to the actual ones. Also, some drawings may be drawn with details omitted.

  A leak test apparatus 100 according to an embodiment will be described with reference to FIGS. 1 (a) and 1 (b) and FIGS. 2 (a) to 2 (c).

  As shown in FIGS. 1A and 1B, the leak test apparatus 100 includes a plate 10, a seal rubber 12, a leak sensor 21, a supply device 22, and a suction device 23.

  The leak test apparatus 100 closes the opening of the workpiece W with the plate 10 and seals it, and the supply device 22 supplies the fluid to the inside of the sealed workpiece W, and the leak sensor 21 supplies the fluid from the inside of the workpiece W It is an apparatus which inspects the seal nature of work W by detecting leak.

  The workpiece W is, for example, a cylinder block of an engine, and the opening of the workpiece W is a front surface of the cylinder block. In order to make the description easy to understand, in the following description, the opening of the workpiece W is assumed to be rectangular.

  The plate 10 closes the opening of the work W. As shown in FIGS. 1A and 2A, a through hole 18 penetrating the plate 10 is provided at, for example, the central portion of the plate 10. The through hole 18 is connected to the leak sensor 21 as shown in FIG. 1 (a). The leak sensor 21 is connected to the supply device 22. The supply device 22 is, for example, an air pump, and supplies a fluid to the inside of the sealed work W. The leak sensor 21 detects a fluid leak from the inside of the workpiece W. The position of the through hole 18 is not limited to the position shown in the present embodiment, and may be inside the groove 11 described later.

  As shown in FIGS. 1 (a), 1 (b) and 2 (a), a groove 11 is formed in the plate 10. As shown in FIG. The seal rubber 12 is fitted in the groove 11. The groove 11 is formed in a shape along the peripheral edge of the opening of the work W when the plate 10 closes the work W. In the present embodiment, the groove 11 is formed in a rectangular shape corresponding to the shape of the opening of the workpiece W. The seal rubber 12 is made of, for example, an elastic rubber, and is formed in a shape corresponding to the shape of the groove 11.

  Further, as shown in FIGS. 1A and 1B, the plate 10 has an intake passage 17 in communication with the groove 11. The intake passage 17 communicates with the groove 11 via a plurality of intake holes 16 as shown in FIGS. 1 (b) and 2 (b). Note that, as shown in FIG. 2C, in the intake passage 17, the plurality of intake holes 16 may be connected to each other to form one intake hole 16.

  The suction device 23 is, for example, a vacuum pump or an ejector. The suction device 23 is operated by a control device (not shown) or manually when drawing the work W and the plate 10 apart after the end of the leak test, and sucks the gas in the intake passage 17. As a result, the pressure in the intake passage 17 is negative, so the seal rubber 12 in the groove 11 is adsorbed to the plate 10. Since the seal rubber 12 is adsorbed to the plate 10, the seal rubber 12 can be prevented from peeling off from the plate 10 even if the seal rubber 12 is stuck to the work W when the work W and the plate 10 are separated.

  As described above in detail, in the leak test apparatus 100, the groove 11 is formed, and the plate 10 which closes the opening of the work W and the groove 11 of the plate 10 are fitted, and the plate 10 closes the opening. A leak test device that supplies a fluid to the inside of the workpiece W sealed by the plate 10 and detects a fluid leak from the inside of the workpiece W when the seal rubber 12 is pressed against the periphery of the opening. An intake passage 17 communicating with the groove 11 is formed in the plate 10, connected to the intake passage 17, and a suction device 23 for sucking the gas in the intake passage 17 when the work W and the plate 10 are separated. Equipped with As a result, when the work W and the plate 10 are separated, the inside of the intake passage 17 becomes negative pressure and the seal rubber 12 is adsorbed to the plate 10, so even if the seal rubber 12 is stuck to the work W, the seal rubber 12 The plate 10 and the work W can be separated without peeling off.

  Further, in Patent Document 1, peeling of the seal rubber is suppressed by thickening the seal rubber at a plurality of locations (by providing nodes in the seal rubber). Here, since the seal rubber needs to be manufactured many times for consumables, it is desirable that the shape of the seal rubber be simple. In addition, when the seal rubber is provided with a node, when replacing the seal rubber, the seal rubber must be attached to the groove formed in the plate while applying pressure to the node, resulting in high work load. For this reason as well, it is desirable that the shape of the seal rubber be simple. According to the leak test apparatus 100 according to the present embodiment, since it is not necessary to provide a node in the seal rubber 12, the shape of the seal rubber 12 can be simplified.

  Further, since the seal rubber is provided with no nodes, the seal area can be reduced, and the clamp load can be reduced, so that the equipment for the leak test can be miniaturized. Furthermore, since the seal rubber is not provided with a section, it is possible to prevent a situation in which the section does not cover a portion that should not be leaked. This can improve the reliability of the leak test.

  The above embodiments are merely examples for carrying out the present invention, and the present invention is not limited to these, and various modifications of these examples are within the scope of the present invention, and further, the present invention. It is obvious from the above description that within the scope various other embodiments are possible.

DESCRIPTION OF SYMBOLS 10 plate 11 groove 12 seal rubber 17 intake passage 23 suction device 100 leak test device

Claims (1)

A groove is formed, a plate closing an opening of the work, and a seal rubber fitted in the groove of the plate and pressed against the peripheral edge of the opening when the plate closes the opening A leak test apparatus for supplying a fluid to the inside of the work sealed by the plate and detecting a leak of the fluid from the inside of the work,
An intake passage communicating with the groove is formed in the plate,
A leak test apparatus comprising: a suction device connected to the suction passage and suctioning a gas in the suction passage when the work and the plate are separated.

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