JP2006284405A - Simple apparatus for negative pressure test - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a simple apparatus for a negative pressure test which can reduce the pressure around a test piece to be observe even with a small-sized, simple structure. <P>SOLUTION: The simple apparatus 10 for a negative pressure test comprises a transparent case 1 which has an opening 11 at the lower end and in which the test piece W1 can be stored, a support 2 which can support the test piece (a sealant W1) and the lower end of the transparent case 1, a sealant 3 for holding the airtightness between the perimeter of the opening 11 of the transparent case 1 and the support 2 with the transparent case 1 supported by the support 2, a negative pressure generation means 4 for discharging air from the inside of the transparent case 1, and an internal pressure adjustment means for adjusting internal pressure to a desired value. For the test piece, anything, which visually changes its shape or condition from when placed under atmospheric pressure to when placed under a pressure less than atmospheric pressure, can be used. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a simple negative pressure test apparatus in which an environment in which an atmospheric pressure equal to or lower than atmospheric pressure can be arbitrarily set is constructed and various tests can be performed therein.

  Conventionally, when performing a test on the strength of an object under test in an atmosphere at atmospheric pressure or lower, an operator carries the object under test into the hermetic chamber, closes the door of the hermetic chamber, and then closes the hermetic chamber. Experimental equipment that can adjust the atmospheric pressure in the hermetic chamber to be equal to or lower than the atmospheric pressure by activating a vacuum pump connected to is used.

  However, when the test is repeated for each product that is continuously carried out from a production line or the like, the work does not progress if the above-described experimental equipment is used. In order to adjust the pressure in the hermetic chamber, sensors for controlling the operation of the vacuum pump are indispensable. Since such sensors are expensive, the running cost associated with the operation of the experimental equipment increases. Accordingly, there is a demand for the development of a test apparatus that can obtain a highly reliable test result with a structure that is small and simple enough to be placed at the hand of a worker at the manufacturing site or to be placed on a table.

In addition, the following patent document discloses a small and simple tester for checking whether or not there is a leak in the DUT, but this is not versatile, and it is a test other than a specific DUT. Difficult to use.
JP 11-326107 A

  The present invention has been made in view of the above circumstances, and provides a simple negative pressure test apparatus that can reduce the pressure around the test object and observe the test object while having a small and simple structure. The purpose is to do.

  A simple negative pressure test apparatus according to the present invention comprises: a transparent case that can open the lower end and accommodate the object under test; a support that can support the object under test and the lower end of the transparent case; and a lower end of the transparent case. A sealing material for maintaining airtightness between the transparent case and the support in a state of being supported by the support, a negative pressure generating means for discharging air from the inside of the transparent case, and an atmospheric pressure inside the transparent case And an internal pressure adjusting means for adjusting the pressure.

  Furthermore, the simple negative pressure test apparatus according to the present invention comprises a pressure gauge that displays the atmospheric pressure inside the transparent case, and an on-off valve that opens the interior of the transparent case to the atmosphere or shuts off the atmosphere. And the on-off valve is attached to the transparent case.

  Furthermore, the simple negative pressure test apparatus according to the present invention is characterized in that the support includes a protrusion that defines a horizontal position of the transparent case.

  Furthermore, in the simple negative pressure test apparatus according to the present invention, the negative pressure generating means includes a suction port for sucking air inside the transparent case, and the suction port is disposed above the support. It is characterized by.

  Further, in the simple negative pressure test apparatus according to the present invention, the on-off valve is composed of a flow rate adjusting valve capable of adjusting a flow rate of air flowing into the transparent case, and the negative pressure generating means discharges the inside of the transparent case. The air pressure inside the transparent case is adjusted by restricting the on-off valve so that the amount of air discharged is constant and the flow rate of the air flowing into the transparent case is balanced with the amount discharged. It is characterized by that.

  According to the simple negative pressure test apparatus according to the present invention, when the object to be tested is placed on the support and the transparent case with the lower end opened is placed on the support, the sealing material ensures airtightness between the transparent case and the support. The In this state, the pressure inside the transparent case in which the DUT is stored (hereinafter referred to as “internal pressure”) is equal to the atmospheric pressure. Furthermore, when air is discharged from the inside of the transparent case by the negative pressure generating means, the internal pressure drops, and the internal pressure can be adjusted by the internal pressure adjusting means so that it becomes a desired value.

  In the above process, the test object inside the transparent case can be observed directly from the outside of the transparent case. Therefore, in the light of the test object placed in the atmospheric pressure, It can be judged at a glance how the shape or mode of the placed test object has changed. For example, when a packaging bag with sealed contents is selected as the DUT, the packaging bag is placed at a pressure lower than atmospheric pressure as compared to when it is placed in atmospheric pressure. On the other hand, since it swells due to the expansion of the air enclosed therein, the change in the shape of the DUT can be visually discriminated. Alternatively, if there is even a slight air leak in the packaging bag, the packaging bag does not swell or the packaging bag swells less. Based on this, it can be recognized that the packaging bag has a defect such as a pinhole.

  As in the above example, just by placing the DUT together with the transparent case on the support, the inside of the transparent case can be sealed to prepare for the above test, so the DUT can be placed in an airtight chamber as in the past. It is possible to omit complicated setup such as loading and closing the door of the hermetic chamber. In addition, the test apparatus does not need to construct a large-scale experimental facility and can be installed on a table, so that there is an advantage that a large installation place and costs for installation are hardly required.

  In addition, since the simple negative pressure test apparatus according to the present invention has the pressure gauge and the on-off valve attached to the transparent case, the piping for connecting the pressure gauge and the on-off valve to the inside of the transparent case is reduced to the minimum. Can do. Moreover, the pressure gauge and the on-off valve can be handled integrally with the transparent case, which is convenient.

  Furthermore, in the process of exhausting air from the inside of the transparent case by the negative pressure generating means, a person observing the DUT (hereinafter referred to as “operator”) closes the on-off valve to shut off the inside of the transparent case from the atmosphere. Then, the internal pressure can be lowered to a desired value. Further, when the air inside the transparent case is discharged by the negative pressure generating means, the internal pressure falls below a desired value. On the other hand, since the operator can check the internal pressure based on the pressure gauge display, when the internal pressure falls below the desired value, the internal pressure can be brought to the desired value by opening the open / close valve and opening the inside of the transparent case to the atmosphere. Can be recovered.

  In particular, when a flow control valve that can adjust the flow rate of air flowing into the transparent case is applied as an open / close valve, the internal pressure of the transparent case that the negative pressure generating means discharges is kept constant and the internal pressure is desired. In order to maintain a balance between the flow rate of the air flowing into the transparent case and the above-mentioned discharge amount in a state where it has fallen below the value of, the throttle of the on-off valve that is a flow rate adjustment valve is adjusted. Thereby, the internal pressure can be maintained at a desired value.

  Accordingly, since expensive sensors that sense the internal pressure and control the operation of the negative pressure generating means are unnecessary, the manufacturing cost of the test apparatus can be reduced. Even if the transparent case is supported by the support and the airtightness between the two is incomplete by the sealing material, the operator can reduce the on-off valve, which is the flow adjustment valve, to increase the internal pressure. Value can be kept.

  Further, according to the simple negative pressure test apparatus according to the present invention, since the protrusion of the support body defines the horizontal position of the transparent case, the test object accommodated in the transparent case together with the transparent case is used as the support body. There is no problem that the transparent case moves carelessly on the support when it is supported.

  Furthermore, according to the simple negative pressure test apparatus according to the present invention, the negative pressure generating means sucks the air inside the transparent case from the suction port arranged above the support. In the case of a closed water tank and a water tank that sinks the periphery of the bottle lid, it is possible to prevent inconvenience that water that has accidentally overflowed from the water tank enters the suction port.

  A simple negative pressure test apparatus according to an embodiment of the present invention will be described. A self-evident technique is applied to the vacuum pump, pressure gauge, or on-off valve described below, and description of the structure or operation thereof is omitted.

  As shown in FIGS. 1 to 3, the simple negative pressure test apparatus 10 includes a transparent case 1 that can open a mouth 11 at the lower end and accommodate a test object W1 therein, a test object (sealing material W1), A support 2 that can support the lower end of the transparent case 1, and a sealing material 3 that maintains airtightness between the periphery of the mouth 11 of the transparent case 1 and the support 2 in a state where the transparent case 1 is supported by the support 2. And a negative pressure generating means 4 for discharging air from the inside of the transparent case 1 and an internal pressure adjusting means 5 for adjusting the internal pressure to a desired value.

  As long as the above-mentioned DUT is placed in the atmospheric pressure and when it is placed in a pressure lower than the atmospheric pressure, its shape or form changes to such an extent that it can be visually discerned. ,anything is fine. The device under test is specifically described in the examples.

  Any material can be applied to the transparent case 1 as long as a part or the whole of the transparent case 1 is transparent and has a rigidity that hardly deforms even when the internal pressure is lower than the atmospheric pressure. In addition, a pressure gauge 6 and an on-off valve 7 for displaying the internal pressure may be directly connected to the transparent case 1. The on-off valve 7 may be anything that can open the inside of the transparent case 1 to the atmosphere or block it from the atmosphere. Further, if the pressure gauge 6 and the opening / closing valve 7 are respectively provided at the upper end of the transparent case 1 and arranged so that they are close to each other, the operator can perform the operation or confirmation of the pressure gauge 6 and the opening / closing valve 7 with good skill. In addition, since the pressure gauge 6 and the on-off valve 7 can be handled integrally with the transparent case 1, it is convenient. The total weight of the transparent case 1 plus the pressure gauge 6 and the on-off valve 7 is preferably such that the operator can lift it with one hand.

  Any material can be used as the support 2 as long as it is flat and can stably support the DUT and the transparent case 1 such as a top plate of a desk, a top surface of a box, a mount, or a floor surface. it can. The sealing material 3 may be an elastic body such as a foamed resin mat or a rubber sheet that can be laid on the above-described exemplary support 2. Alternatively, a rubber ring or the like that can be in close contact with the support 2 may be attached to the periphery of the mouth portion 11 of the transparent case 1.

  Any means can be applied to the negative pressure generating means 4 as long as air can be discharged from the inside of the transparent case 1. For example, the inside of the transparent case 1 may be evacuated by connecting a vacuum pump to the inside of the transparent case 1 and starting the vacuum pump. Or when the vacuum line is piped in order to supply negative pressure to a wide site such as a factory, the inside of the transparent case 1 may be connected to the vacuum line.

  As the internal pressure adjusting means 5, the negative pressure generating means 4 discharges air from the inside of the transparent case 1 so that it opens when the internal pressure falls below a desired value and introduces the atmosphere into the transparent case 1. May be applied. Alternatively, the internal pressure may be kept constant by appropriately operating the on-off valve 7 by the operator based on the display of the pressure gauge 6. This procedure is described in the examples.

  As the transparent case 1, a transparent acrylic resin pipe 12 having an inner diameter of 162 mm and a height of 240 mm is used. The lower end of the resin pipe 12 is left open as a smooth cut as much as possible, but the upper end is closed with an aluminum disc 13. Further, a column 61 of a Bourdon tube pressure gauge applied as the pressure gauge 6 is fixed to the disc 13, and air inside the transparent case 1 is introduced into the Bourdon tube of the pressure gauge 6 through the column 61. One end of the on-off valve 7 communicates with the inside of the transparent case 1 via a T-shaped branch pipe 62 provided in the middle of the column 61, and the other end is opened to the atmosphere. Except for the column 61 and the branch pipe 62, piping for connecting the pressure gauge 6 and the on-off valve 7 to the inside of the transparent case 1 is unnecessary.

  As the on-off valve 7, a flow rate adjustment valve capable of adjusting the flow rate of the air flowing into the transparent case 1 is applied in addition to the fully open or fully closed operation. As the negative pressure generating means 4, a vacuum pump housed in the housing 8 is applied. This vacuum pump has a constant amount of air that can be discharged from the inside of the transparent case 1 per predetermined time. In this embodiment, the upper surface of the housing 8 is used as the support 2. The front panel of the housing 8 is provided with a power switch 40 for starting or stopping the vacuum pump. The sealing material 3 is silicon rubber that covers the upper surface of the housing 8 and has a hardness of 50.

  Further, a plurality of protrusions 9 that define the horizontal position of the transparent case 1 are fixed to the housing 8. 2A and 4B, a plurality of bolts 91 penetrating the upper surface of the housing 8 and the sealing material 3 are respectively attached to the housing 8, and the cap nuts screwed into the individual bolts 91 project. Nine. The suction port 41 for the negative pressure generating means 4 to suck the air inside the transparent case 1 is disposed above the support 2 and the sealing material 3. That is, the suction side port 42 of the vacuum pump is connected to the lower end of the extension pipe 43, and the upper end of the extension pipe 43 is connected to the upper surface of the casing 8 through the pipe joint 44 that penetrates the upper surface of the casing 8. It is connected to a standing suction pipe 45.

  As shown in FIG. 5A, when a sheet-like sealing material W1 that closes the mouth of the container 14 is selected as the first test object, the container 14 is placed so that the sealing material W1 faces upward. Then, it is placed on the sealing material 3 on the support 2. Then, the transparent case 1 is placed on the sealing material 3 on the support 2 so as to cover the sealing material W1 from above. Thereby, since the transparent case 1 presses the lower end against the sealing material 3 by its own weight, airtightness between the transparent case 1 and the support 2 is ensured. In this state, the internal pressure is equal to the atmospheric pressure, and the plurality of protrusions 9 abut against the outer peripheral surface of the transparent case 1 from three or four directions, so that the transparent case 1 moves carelessly on the support 2. There is no.

  As described above, according to the simple negative pressure test apparatus 10, the inside of the transparent case 1 can be hermetically sealed and the preparation for the above test can be prepared only by placing the test object together with the transparent case 1 on the support 2. Thus, it is possible to omit troublesome setup such as loading the device under test into the hermetic chamber and closing the door of the hermetic chamber.

  Subsequently, if the on-off valve 7 is closed to shut off the inside of the transparent case 1 from the atmosphere and the negative pressure generating means 4 is activated to discharge air from the inside of the transparent case 1, the internal pressure begins to gradually decrease. At the same time, as the difference between the atmospheric pressure and the internal pressure increases, the transparent case 1 is strongly pressed against the sealing material 3, so that airtightness between the transparent case 1 and the support 2 is ensured. And if the discharge of air by the negative pressure generating means 4 is continued, the internal pressure will drop toward the target value. The target value means a desired value required for the test and is, for example, -53.3 kpa.

  In the process of decreasing the internal pressure, the operator can recognize the internal pressure based on the display of the pressure gauge 6, and when the internal pressure drops to the target value, the flow rate of the air flowing into the transparent case 1 and the generation of negative pressure are generated. The internal pressure can be maintained at the target value by adjusting the throttle of the on-off valve 7 that is a flow rate adjustment valve so that the balance with the discharge amount of the means 4 can be maintained. Thereby, the function of said internal pressure adjustment means 5 can be achieved. Therefore, the simple negative pressure test apparatus 10 does not require expensive sensors for sensing the internal pressure and controlling the operation of the negative pressure generating means 4. The accompanying running cost can be reduced. Even when the transparent case 1 is supported by the support 2 and the airtightness between the two by the sealing material 3 is incomplete, the operator further throttles the open / close valve 7 to the inside of the transparent case 1. If the flow rate of the air flowing into the air is reduced, the internal pressure can be maintained at the target value.

  On the other hand, the operator can directly observe the sealing material W1 visually from the outside of the transparent case 1 while the internal pressure is decreasing and in a state where the internal pressure is maintained at the target value. Thus, the operator can determine whether or not a defect such as a pinhole exists in the sealing material W1. That is, as the internal pressure decreases, the air (atmospheric pressure) sealed in the container 14 by the sealing material W1 tends to expand, and the sealing material W1 is pushed from the mouth of the container 14 as shown in FIG. Inflate in the direction of exit. If the same test is repeated for another sealing material W1 after observing this change, the sealing material W1 swells in the same manner. Since the air enclosed in the container 14 leaks from the container 14 and can expand freely, the sealing material W1 does not swell significantly as described above. Based on such a difference in change, the operator can find a defect in the sealing material W1.

  In addition, if the sealing material W1 has a very small defect, the amount of air sealed in the container 14 leaks out of the container 14 even if the internal pressure drops, so the sealing material W1 is defective. It may swell with or without it. Therefore, if the observation of the sealing material W1 is continued while maintaining the internal pressure at the target value, the air expanded inside the container 14 necessarily leaks from the container 14, so that the pressure difference between the inside and outside of the container 14 decreases, and finally The shape of the sealing material W1 is restored. Based on this, the operator can find a defect of the remarkably fine sealing material W1.

  Alternatively, depending on the material of the sealing material W1, the swelling may be hardly recognized regardless of the presence or absence of the defect. Even in this case, if there is a defect in the sealing material W1, air leaks from the inside of the container 14 while maintaining the internal pressure at the target value, so that the internal pressure of the container 14 decreases to the internal pressure or a value close thereto. . Assuming this, if the on-off valve 7 is fully opened and the internal pressure is rapidly increased to atmospheric pressure, the sealing material W1 is rapidly pushed into the inside of the container 14. Based on such remarkable deformation, the operator can find a defect of the sealing material W1.

  In addition, the simple negative pressure test apparatus 10 can be used to confirm the breaking strength of the test object. For example, as shown in FIG. 6, when a product packed with confectionery or the like is transported by air, if the air pressure above the air pressure inside the container 14 becomes lower, the air sealed in the container 14 will expand. And For this reason, if the sealing material W1 is firmly adhered to the mouth of the container 14, the sealing material W1 only needs to swell, but if the above-described adhesion is weak, or the strength of the sealing material W1 is insufficient. Then, the sealing material W1 may be peeled off from the container 14, or the sealing material W1 itself may be broken. In order to test whether such a situation occurs, the container 14 (product) whose mouth is closed with the sealing material W1 is stored in the transparent case 1, and the internal pressure is lowered to a value corresponding to the atmospheric pressure in the sky. May be maintained for a predetermined time.

  Further, when the operator has finished the above test, if the operator stops the negative pressure generating means 4 or fully opens the on-off valve 7, the internal pressure recovers to the atmospheric pressure, so the difference between the atmospheric pressure and the internal pressure is eliminated. Due to this difference, the force for pressing the transparent case 1 against the sealing material 3 can be cut off. Thereafter, if the operator lifts the transparent case 1 by hand, the operator can perform operations such as removing the object to be tested from the simple negative pressure test apparatus 10. Further, in the above test, in order to keep the internal pressure at the target value, the operator explained that the throttle of the on-off valve 7 is adjusted when the internal pressure drops to the target value. If the throttle adjustment of the on-off valve 7 is determined in this test, the on-off valve 7 does not have to be adjusted again and again in the subsequent test.

  As shown in FIG. 7A, when the packaging bag W2 for sealing the contents 15 such as confectionery is selected as the second object to be tested, the packaging bag W2 together with the contents 15 is transparent case as described above. 1 and the internal pressure is lowered to the target value, the packaging bag W2 expands as the air sealed in the packaging bag W2 expands, as shown in FIG. 7B. If the same test is repeated for another packaging bag W2 after observing this change, the packaging bag W2 will swell in the same way, but the packaging bag W2 is missing even if it cannot be confirmed visually. Since the air enclosed in the packaging bag W2 leaks from the packaging bag W2, the packaging bag W2 does not swell significantly as described above. Based on such a difference in change, the operator can find a defect in the packaging bag W2. Reference numeral 31 indicates a cradle for supporting the packaging bag W2 at an appropriate height.

  Further, if the packaging bag W2 has a very small defect, the amount of air sealed in the packaging bag W2 leaks out of the packaging bag W2 even if the internal pressure is reduced. It may swell regardless of it. In this case, if the packaging bag W2 is a material rich in elasticity, the packaging bag W2 is gradually contracted and its shape is restored by waiting for air to leak from the packaging bag W2 while maintaining the internal pressure at the target value. Based on this, the operator can find a defect in the packaging bag W2. Further, when the packaging bag W2 has almost no elasticity, the packaging bag W2 keeps the swollen shape even when waiting for air to leak from the packaging bag W2. Therefore, if the air pressure inside the packaging bag W2 is reduced to the internal pressure or a value close to it, the on-off valve 7 is fully opened and the internal pressure is rapidly increased to the atmospheric pressure, so that the shape of the packaging bag W2 is rapidly increased. It is crushed. Based on such remarkable deformation, the operator can find a defect of the sealing material W1.

  As shown in FIG. 8, when a combination of a bottle W3 whose bottle mouth is closed with a lid 16 and a water tank 17 for submerging the periphery of the bottle mouth of the bottle W3 is selected as the third object to be tested. The bottle W3 may be urged downward using the weight 18 so that the lid 16 does not float on the water surface together with the bottle W3. Then, when the bottle W3 and the water tank 17 are accommodated in the transparent case 1 and the internal pressure is lowered to the target value in the above manner, the lid 16 is reached at that time or when a predetermined time has passed with the target value maintained. If the airtightness between the bottle W3 and the bottle W3 is incomplete, or the lid 16 is slightly missing, the air inside the bottle W3 leaks into the water and bubbles are generated. Thereby, the operator can find out a defect of the lid 16 or the bottle W3.

  In addition, the operator may be able to directly view the leakage of the liquid contents. For example, as shown in FIG. 9, when the bottle W3 with the lid 16 closed is inverted and stored in the transparent case 1 and the internal pressure is lowered to the target value, a predetermined value is maintained at that time or while maintaining the target value. When the time has elapsed, if there is a problem as described above, the contents 19 of the bottle W3 will leak out.

  Further, when the bottle W3 or the water tank 17 is handled, there is a possibility that the contents 19 or water may accidentally flow down to the support body 2 or the sealing material 3, but the suction port 41 is disposed above the support body 2 as described above. Therefore, it is possible to prevent the contents 19 or water from being sucked into the negative pressure generating means 4 together with air. Furthermore, even if the contents 19 or water scatters inside the transparent case 1, the suction pipe 45 is sucked by curving the vicinity of its upper end in a J shape so that it does not easily enter the inside of the suction pipe 45. Port 41 is facing downward.

  As described above, when the simple negative pressure test apparatus 10 is used, the operator can test the test object placed in the atmospheric pressure lower than the atmospheric pressure in the light of the test object placed in the atmospheric pressure. It is possible to accurately recognize at a glance how the shape or form has changed. Based on this, the operator can surely find a defect of the DUT or a defect that is latent in the DUT.

  It should be noted that the present invention can be implemented in variously modified, modified, or modified forms based on the knowledge of those skilled in the art without departing from the spirit of the present invention. For example, the transparent case 1 may be box-shaped, spherical, or conical. Further, a suction port 41 may be provided at an appropriate position of the transparent case 1 so that the negative pressure generating means 4 can suck the air inside the transparent case 1 from the suction port 41 via a flexible hose or the like. In this case, processing such as passing the pipe joint 44 through the support 2 can be omitted, so that the simple negative pressure test apparatus 10 can be installed more simply.

  Further, two or more on-off valves 7 may be provided, one of which may be fully opened or fully closed, and the other of which may function as a flow rate adjusting valve. Further, when a relief valve that opens when the internal pressure drops to the target value is applied as the internal pressure adjusting means 5, the above test can be performed even if the pressure gauge 6 is omitted.

  The technology according to the present invention is not limited to confirming leakage of containers and the like, and can be used in various fields. For example, in the case of vacuum cooking of ingredients, when conducting science experiments in classrooms at schools, etc., or when conducting product demonstrations on the go, immediately in the case, ingredients, laboratory equipment, or If goods etc. are stored, each circumference can be adjusted to desired atmospheric pressure.

The perspective view which shows the external appearance of the simple negative pressure test apparatus which concerns on embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS The side view which looked at the simple negative pressure test apparatus which concerns on embodiment of this invention, and the transparent case applied to it in cross section. The top view of the simple negative pressure test apparatus which concerns on embodiment of this invention. Sectional drawing of the principal part of the simple negative pressure test apparatus which concerns on embodiment of this invention. (A) is a side view of the first test object placed in atmospheric pressure, (b) is a side view of the first test object placed in atmospheric pressure lower than atmospheric pressure. The side view of the 1st to-be-tested object destroyed in the atmospheric pressure lower than atmospheric pressure. (A) is a side view of a second test object placed in atmospheric pressure, (b) is a side view of a second test object placed in atmospheric pressure lower than atmospheric pressure. The side view of the 3rd to-be-tested object put in the atmospheric pressure lower than atmospheric pressure. The side view which shows the state which inverted the bottle which comprises a 3rd to-be-tested object.

Explanation of symbols

1: Transparent case 2: Support body 3: Sealing material 4: Negative pressure generating means 5: Internal pressure adjusting means 6: Pressure gauge 7: On-off valve 8: Housing 9: Projection 10: Simple negative pressure test device 41: Suction port

Claims (5)

  A transparent case that has a lower end open and can store the object under test; a support that can support the object under test and the lower end of the transparent case; and the transparent case with the lower end of the transparent case supported by the support. A sealing material for maintaining airtightness between the case and the support, negative pressure generating means for discharging air from the inside of the transparent case, and internal pressure adjusting means for adjusting the air pressure inside the transparent case. Simple negative pressure testing device.   A pressure gauge that displays the atmospheric pressure inside the transparent case; and an on-off valve that opens or shuts off the inside of the transparent case to the atmosphere, and the pressure gauge and the on-off valve are each attached to the transparent case. The simple negative pressure test apparatus according to claim 1, wherein   The simple negative pressure test apparatus according to claim 1, wherein the support includes a protrusion that defines a horizontal position of the transparent case.   The said negative pressure generation means is provided with the suction port which attracts | sucks the air inside the said transparent case, The said suction port is arrange | positioned above the said support body, The said any one of Claim 1 thru | or 3 characterized by the above-mentioned. Simple negative pressure test device as described.   The on-off valve is composed of a flow rate adjustment valve capable of adjusting a flow rate of air flowing into the transparent case, and a constant discharge amount of air inside the transparent case discharged by the negative pressure generating means. 5. The air pressure inside the transparent case is adjusted by narrowing the on-off valve so that a balance between the flow rate of the air flowing into the interior and the discharge amount can be maintained. The simple negative pressure test device described in 1.

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