JP2006258425A - Method for inspecting quality of filter element and quality inspection device for filter element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and device for rapidly and easily inspecting the quality of a filter element. <P>SOLUTION: This device comprises a tubular duct body 11, a porous member 12 disposed on an upper part of the duct body 11, a cover member 15 having an opening 15a with its size corresponding to that of an outlet surface portion of a filter element E, an air exhaust means allowing the volume of a gas flowing through the duct body 11 to be arbitrarily set, and a differential pressure gauge 19 with the filter element E placed thereon for measuring a pressure loss of the filter element E when air is let flow through the duct body 11 by the exhaust means. This device is characterized by being equipped with an evaluation means for evaluating the quality of the filter element based on a measured value on the pressure loss of the filter element E measured by the pressure gauge 19 and a warning means for issuing a warning based on the result of the evaluation made by the evaluation means. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention includes an air purifier, an air conditioner, a filter for ventilation and air conditioning, a filter for the purpose of dust removal and deodorization such as an air purification filter when introducing air into a vehicle interior, and a trace gas component such as a clean room and OA equipment. The present invention relates to a method for inspecting the quality of a filter element used for a removal filter and the like, and a quality inspection apparatus for the filter element. More particularly, the present invention relates to a method for inspecting the quality of a filter element that evaluates the quality by measuring the pressure loss of the filter element, and a quality inspection apparatus for the filter element.

  The filter element is manufactured by sticking a frame material made of tape, such as paper or non-woven fabric, to each side around the pleated filter media with hot melt resin etc. Has been.

  Conventionally, such filter elements have been continuously manufactured on a production line, and the quality is extracted for each manufactured product or for each of a plurality of products, and the pressure loss is measured and visually inspected. It was managed by that.

  However, when measuring the pressure loss of the filter element, when using the conventional filter test apparatus defined in JIS B 9908, the mounting and demounting of the product on the duct must be repeated for each measurement. It was a very complicated task.

  In addition, there is a correlation between pressure loss and air volume. That is, when the pressure loss is measured with the filter element attached to the filter test apparatus, the air volume tends to decrease as the pressure loss increases. For this reason, in order to measure the pressure loss under a constant air volume, it was necessary to measure the pressure loss after adjusting the air volume for each filter element to be measured. As described above, the measurement of the pressure loss of the filter element is a very troublesome work because the trouble of attaching and detaching the product to the duct and the trouble of adjusting the air volume for each product are added.

A filter element performance measuring apparatus which is an invention made for the purpose of eliminating the complexity of the pressure loss measurement work of the filter element described above, and which can automatically measure the pressure loss of the filter element. Proposed. The apparatus includes an upstream duct, a downstream duct communicating with the upstream duct, an air flow means for causing air to flow in the upstream duct and the downstream duct, and between the upstream duct and the downstream duct. Filter conveying means that automatically conveys the filter, and measuring means for measuring pressure loss in the upstream duct and the downstream duct when a filter exists between the upstream duct and the downstream duct; The air flow means is configured to flow air of a rated air volume suitable for each depending on whether the filter is a regular size or a half size (Patent Document 1). reference).
JP 2001-305042 A

  However, the pressure loss measuring device of the filter element described in Patent Document 1 enables automatic measurement of pressure loss and has the effect of eliminating the complexity of measurement work, but has a complicated structure, Moreover, it is very expensive and unsuitable as a measuring device used only for measuring the pressure loss of the filter element.

  The present invention has been created from such a technical background, and provides a method for inspecting the quality of a filter element and a quality inspection apparatus for the filter element that can inspect the quality of the filter element quickly and easily. It is intended to do.

In order to achieve the above object, the invention according to claims 1 to 4 is a method for inspecting the quality of a filter element,
Measure the pressure loss at the airflow value arbitrarily set for the upper limit reference filter element having the upper limit value of pressure loss, and the obtained measured value as the upper limit reference value,
Next, for the test filter element to inspect the quality, measure the pressure loss at the same air flow value as the upper limit reference filter element,
Next, the measured value of the test filter element is compared with the upper limit reference value, and when it is evaluated that the measured value of the test filter element exceeds the upper limit reference value, a warning is issued. The gist of the method is to inspect the quality of the filter element.

Moreover, in invention of Claims 5-7, it is an apparatus which test | inspects the quality of a filter element,
A tubular duct body;
A porous member disposed at the top of the duct body;
A cover member having an opening corresponding to the size of the outlet surface portion of the filter element;
Air discharge means capable of arbitrarily setting the amount of air flowing in the duct body;
The porous member of the duct body is covered with a cover member, the filter element is placed with the outlet surface portion of the filter element aligned with the opening of the cover member, and arbitrarily set in the duct body by the air discharge means A differential pressure gauge that measures the pressure loss of the filter element when air is flowed at a flow rate of
Evaluation means for evaluating the quality of the filter element based on a measured value of the pressure loss of the filter element measured by the differential pressure gauge, and warning means for issuing a warning based on the evaluation result by the evaluation means The filter element quality inspection apparatus characterized by this is the gist.

  In the method for inspecting the quality of the filter element of the present invention (hereinafter simply referred to as inspection method), the pressure loss at an air flow value arbitrarily set for the upper limit reference filter element having the upper limit value of pressure loss is measured and obtained. The measured measurement value is used as the upper limit reference value, and then the pressure loss at the same air volume value as the upper limit reference filter element is measured for the test filter element for inspecting the quality, and then the measurement value of the test filter element and the upper limit Since a warning is issued when the measured value of the test filter element is evaluated to exceed the upper reference value in comparison with the reference value, the quality of the filter element can be quickly and easily inspected. .

  In addition, in this inspection method, in addition to determining whether or not the test filter element has a pressure loss within the standard, filter media that may be missed by visual inspection, such as crushing or overlapping of filter media, etc. Appearance defects can also be found from a warning when it is estimated that the upper limit reference value is exceeded.

  In addition, this inspection method can be used during the filter element production line, so it is possible to remove defective products before finishing the final product, and to finish the final product even though it is a defective product. This can reduce wasteful labor and costs.

Moreover, in the quality inspection apparatus for filter elements of the present invention (hereinafter simply referred to as inspection apparatus), a cylindrical duct body,
A porous member disposed at the top of the duct body;
A cover member having an opening corresponding to the size of the outlet surface portion of the filter element;
Air discharge means capable of arbitrarily setting the amount of air flowing in the duct body;
The porous member of the duct body is covered with a cover member, and the filter element is placed with the outlet surface portion of the filter element aligned with the opening of the cover member, and arbitrarily set in the duct body by the air discharge means A differential pressure gauge for measuring the pressure loss of the filter element when air is flowed at a flow rate of
Evaluation means for evaluating the quality of the filter element based on the measured value of the pressure loss of the filter element measured by the differential pressure gauge, and warning means for issuing a warning based on the evaluation result by the evaluation means It has a simple structure, and by simply placing the filter element on the cover member, it is possible to measure the pressure loss of the filter element and evaluate the quality of the filter element, and quickly and easily inspect the quality of the filter element. can do.

  In addition, in this inspection apparatus, in addition to determining whether the filter element has a pressure loss within the standard, in addition to the appearance such as crushing and overlapping of filter media that may be missed by visual inspection. Can also be found from warnings based on measurements that exceed standards.

  In addition, this inspection device can be arranged in the filter element production line, so that it is possible to remove defective products before finishing the final product, and to finish the final product even though it is a defective product. This can reduce wasteful labor and costs.

  Hereinafter, the inspection method and inspection apparatus of the present invention will be described in more detail. FIG. 1 is a perspective view of a duct main body of an inspection apparatus used in the inspection method of the present invention, and FIG. It is a perspective view which shows the state mounted or removed.

  First, the inspection apparatus of the present invention will be described. As shown in FIGS. 1 and 2, the inspection apparatus 10 of the present invention has a cylindrical duct body 11, and a porous member 12 is disposed on the upper part of the duct body 11. In addition, a wind exhauster 14 is installed in the lower part of the duct main body 11 via an air exhaust duct 13, and when the exhaust fan 14 is started, a predetermined amount of air is indicated in the duct main body 11 by an arrow in FIG. 1. In this way, the gas flows from the upper porous member 12 side toward the lower direction and is discharged out of the duct body 11 through the air discharge duct 13.

  The shape and size of the duct main body 11 in the inspection apparatus 10 are arbitrary, and can be appropriately changed according to the size and type of the filter element to be inspected and the required inspection level.

  The capacity of the exhaust fan 14 is desirably set to such a capacity that the speed of the rotor blades does not fluctuate with an increase in pressure loss when the filter element is mounted. In the example shown in FIGS. A 0.75-2.2 kW exhaust fan was used. The exhaust fan 14 is connected to a control box 20 installed at another position, and the operation is started or stopped by operating the operation button and the stop button of the control box 20.

  The air discharge duct 13 at the lower part of the duct body 11 is provided with a damper 16 for adjusting the air volume so that the air volume is adjusted prior to the operation of the exhaust fan 14 or after the operation is started. It has become. In the example shown in the drawing, the air discharge means is constituted by the damper 16 for adjusting the air volume and the above-described exhaust fan 14. Note that dust collectors (not shown) may be disposed before and after the air exhaust device 14 to remove dust in the exhausted air.

  The porous member 12 disposed on the upper portion of the duct body 11 may be any member as long as it has a porosity that does not substantially cause pressure loss. For example, an expanded metal, a punching metal, a wire mesh, or the like can be used. In the examples shown in the drawings, expanded metal was used.

  Note that “substantially no pressure loss” means that the pressure is 3% or less with respect to the pressure loss of the upper limit reference filament under the test wind speed conditions.

  Further, as shown in FIG. 2, a cover member 15 is attached to the upper surface of the porous member 12 above the duct body 11 so as to cover the upper surface of the porous member 12. The cover member 15 has an opening 15a corresponding to the size of the filter element E, more specifically, the size of the outlet surface portion of the filter element E, so that outside air enters the duct body 11 through the opening 15a. It has become. For this reason, the cover member 15 corresponding to the filter element E to be measured is appropriately selected according to the type of the filter element E to be measured, and attached to the upper surface of the porous member 12 above the duct body 11. In addition, a guide member 15b serving as a guide when the filter element E is placed is attached around the opening 15a.

  Although not shown in the drawings, when the cover member 15 is attached to the upper surface of the porous member 12 above the duct main body 11, if these attachment states are insufficient, an air leak may occur. When an air leak occurs, it is not possible to accurately measure the differential pressure (pressure loss). Therefore, it is desirable that the cover member 15 is securely attached to the upper surface of the porous member 12 above the duct body 11. Specifically, the occurrence of air leak can be prevented by taking measures such as providing a recess in which the upper part of the duct body 11 is fitted on the back surface of the cover member 15.

  Further, an insertion hole 18 is provided in the vicinity of the upper portion of the duct main body 11 for inserting a differential pressure measuring meter 19 for measuring the differential pressure in the duct main body 11 (differential pressure with respect to atmospheric pressure). The differential pressure measuring meter 19 is connected to a control box 20 installed at a different position, and data of pressure loss measured by the differential pressure measuring meter 19 is sent to the control box 20, and the inside of the control box 20 The data is compared and evaluated by the evaluation means (computer) provided in.

  The control box 20 is provided with a display unit for digitally displaying the pressure loss measurement data from the differential pressure gauge 19. The control box 20 displays the result of comparison and evaluation performed by the evaluation means (computer) based on the pressure loss measurement data from the differential pressure gauge 19 by blinking “OK” or “NG”. A judgment lamp is arranged.

  The control box 20 is provided with a signal pole with a buzzer for notifying the result of comparison and evaluation by the evaluation means (computer) by sound. This signal pole can also be installed at a location away from the control box 20 via a signal transmission cable. In the example shown in the drawing, a signal pole with a buzzer for notifying the evaluation result by sound and the above-described determination lamp are used as warning means.

  Note that the measurement data from the differential pressure gauge 19 and the results of comparison and evaluation from the control box 20 can be recorded on paper as well as recorded in a computer. In the illustrated example, a printer 17 is installed on the control box 20, and the measurement data from the differential pressure measurement meter 19, the comparison from the control box 20, and the results of evaluation are printed.

  In the inspection apparatus 10 configured as described above, the pressure loss of the filter element E can be measured by placing the filter element E on the cover member 15 attached to the upper surface of the porous member 12 above the duct body 11. The quality can be evaluated, and the quality of the filter element can be inspected quickly and easily.

  Moreover, in this inspection apparatus, it can arrange | position in the manufacturing line of a filter element. In the example shown in FIG. 3, the inspection device 10 is arranged between the final process of the filter element production line and the product packaging process. For this reason, it is possible to remove the defective product before finishing it into the final product, and to reduce the wasteful labor and cost of finishing the final product even though it is a defective product.

  In this case, the evaluation result obtained by the inspection apparatus 10 of the present invention can be fed back to the filter element manufacturing process. Thereby, the quality of the product can be further improved.

  Next, the inspection method of the present invention will be described. The filter element E to be inspected by the inspection method of the present invention aims to remove dust and deodorize an air purifier, an air conditioner, a ventilation air conditioning filter, an air purifying filter when introducing air into the vehicle interior, and the like. Examples include filters and filter elements used for trace gas component removal filters such as clean rooms and OA equipment, and filter elements used for such applications include, for example, a filter material that has been pleated as shown in FIG. The frame material made of a tape such as paper or non-woven fabric is stuck to each side around the filter medium through a hot melt resin or the like while maintaining the number and interval of the folds. Further, the filter element is manufactured, for example, having a side of 5 to 70 cm and a height of 0.5 to 15 cm.

  FIG. 4 shows a flow of one embodiment of the inspection method of the present invention, and FIG. 5 shows a flow of another embodiment of the inspection method of the present invention. The inspection method will be described. The flow shown in FIGS. 4 and 5 corresponds to the final process of the filter element production line and the product packaging process in the filter element production line, specifically as shown in FIG. It is assumed that the inspection method of the present invention is performed in the filter element production line.

  As shown in FIGS. 1 and 2, before carrying out the inspection method of the present invention, a cover corresponding to the type (size) of the filter element E placed on the porous member 12 of the duct body 11 is provided. The member 15 is selected and attached to the upper surface of the porous member 12 above the duct body 11.

  First, as shown in FIG. 4, the power switch of the control box 20 of the inspection apparatus 10 is turned on (S1). Next, an operation start switch of the exhaust fan 14 provided in the control box 20 of the inspection apparatus 10 is turned on (S2). In accordance with the input of the switch, the exhaust fan 14 installed via the air discharge duct 13 below the duct body 11 connected thereto is started.

  When the exhaust fan 14 is started, air flows into the duct body 11 from the porous member 12 side toward the lower portion of the duct body 11 as indicated by an arrow in FIG. 1, and the duct body 11 passes through the air discharge duct 13. It will be discharged outside.

  Next, the air volume is adjusted by the air volume adjusting damper 16 provided in the air discharge duct 13 below the duct body 11 (S3). Thereby, the air volume value of the air flowing through the duct body 11 can be set to a predetermined numerical value. It should be noted that the air volume adjustment can be performed prior to the operation of the exhaust fan 14, not after the operation of the exhaust fan 14 is started.

  Next, an upper limit reference filter element E having an upper limit value of pressure loss is placed on the porous member 12 of the duct body 11 (S4). When the upper limit reference filter element E is placed on the porous member 12, the differential pressure in the duct body 11 is measured by the differential pressure gauge 19, and the measured differential pressure data is automatically calculated by the calculation means in the control box 20 to obtain the pressure A loss is derived (S5).

  When the derived pressure loss exceeds the initially set amount, the evaluation means (computer) provided in the control box 20 works to recognize and store this as the upper limit reference value (S6).

  Next, the upper reference filter element E on the porous member 12 of the duct body 11 is removed (S7), and a test filter element E for quality inspection is placed instead (S8). When the test filter element E is placed on the porous member 12, the evaluation means (computer) determines whether the test of the test filter element E placed on the porous member 12 is equal to or less than a predetermined inspection quantity (S9). . The inspection ends when the inspection exceeds a predetermined inspection quantity. If it is less than the inspection quantity, the differential pressure in the duct body 11 is measured by the differential pressure gauge 19, and the measured differential pressure data is automatically calculated by the calculation means in the control box 20 to derive the pressure loss (S10). .

  Next, the evaluation means (computer) compares the derived pressure loss with the stored upper limit reference value to evaluate whether the pressure loss of the test filter element exceeds the upper limit reference value (S11).

  When the evaluation means (computer) evaluates that the pressure loss of the test filter element exceeds the upper reference value, it sends a “NG” signal to the warning pole, a signal pole with a buzzer that informs the evaluation result by sound, and a judgment lamp A warning is issued.

  The test filter element that is evaluated as “NG” exceeding the upper limit reference value by the evaluation means is removed from the production line as a defective product and is not sent to the product packaging process. Further, after being removed from the production line as a defective product, the operation returns to S8 (not shown). Note that the test filter element that is evaluated as “NG” exceeding the upper limit reference value by the evaluation means is not missed in the visual inspection other than the case where the test filter element does not have the pressure loss within the standard. This includes cases where there are defects in the appearance such as crushing and overlapping of filter media that may occur. In either case, the filter medium is treated as a defective product.

  When the evaluation means (computer) evaluates that the pressure loss of the test filter element does not exceed the upper reference value, an “OK” signal is sent to a judgment lamp, which is a warning means, and does not exceed the upper reference value. The test filter element evaluated as "is sent to the packaging process as a product.

  When the pressure loss of the test filter element does not exceed the upper limit reference value, the process returns to S8, the inspections of S8 to S11 are repeated by a predetermined amount, and then the process ends.

  Next, a flow shown in FIG. 5 showing another embodiment of the inspection method of the present invention will be described. First, as shown in FIG. 5, the power switch of the control box 12 of the inspection apparatus 10 is turned on (S1). Next, an operation start switch of the exhaust fan 14 provided in the control box 12 of the inspection apparatus 10 is turned on (S2). In accordance with the input of the switch, the exhaust fan 14 installed via the air discharge duct 13 below the duct body 11 connected thereto is started.

  When the exhaust fan 14 is started, air flows into the duct body 11 from the porous member 12 side toward the lower portion of the duct body 11 as indicated by an arrow in FIG. 1, and the duct body 11 passes through the air discharge duct 13. It will be discharged outside.

  Next, the air volume is adjusted by the air volume adjusting damper 16 provided in the air discharge duct 13 below the duct body 11 (S3). Thereby, the air volume value of the air flowing through the duct body 11 can be set to a predetermined numerical value. It should be noted that the air volume adjustment can be performed prior to the operation of the exhaust fan 14, not after the operation of the exhaust fan 14 is started.

  Next, an upper limit reference filter element E having an upper limit value of pressure loss is placed on the porous member 12 of the duct body 11 (S4). When the upper limit reference filter element E is placed on the porous member 12, the differential pressure in the duct body 11 is measured by the differential pressure gauge 19, and the measured differential pressure data is automatically calculated by the calculation means in the control box 20 to obtain the pressure. A loss is derived (S5).

  If the derived pressure loss exceeds the initially set amount, the evaluation means (computer) provided in the control box 20 works to recognize and store this as the upper limit reference value (S6).

  Next, the upper limit reference filter element E on the porous member 12 of the duct body 11 is removed (S7), and instead, the lower limit reference filter element having the lower limit value of the pressure loss is put on (S8). When the lower limit reference filter element E is placed on the porous member 12, the differential pressure in the duct body 11 is measured by the differential pressure gauge 19, and the measured differential pressure data is automatically calculated by the calculation means in the control box 20. A loss is derived (S9).

  When the derived pressure loss exceeds the initially set amount and the exceeding amount is almost the same or very small, the evaluation means (computer) provided in the control box 20 recognizes and stores this as the lower limit reference value ( S10).

  Next, the lower limit reference filter element E on the porous member 12 of the duct body 11 is removed (S11), and a test filter element E for quality inspection is placed instead (S12). When the test filter element E is placed on the porous member 12, the evaluation means (computer) determines whether the test of the test filter element E placed on the porous member 12 is equal to or less than a predetermined test quantity (S13). . The inspection ends when the inspection exceeds a predetermined inspection quantity. If it is equal to or less than the inspection quantity, the differential pressure in the duct body 11 is measured by the differential pressure gauge 19, and the measured differential pressure data is automatically calculated by the calculation means in the control box 20 to derive the pressure loss (S14). .

  Next, the evaluation means (computer) compares the derived pressure loss with the stored upper limit reference value to evaluate whether the pressure loss of the test filter element exceeds the upper limit reference value (S15).

  When the evaluation means (computer) evaluates that the pressure loss of the test filter element exceeds the upper reference value, it sends a “NG” signal to the warning pole, a signal pole with a buzzer that informs the evaluation result by sound, and a judgment lamp A warning is issued.

  The test filter element that is evaluated as “NG” exceeding the upper limit reference value by the evaluation means is removed from the production line as a defective product and is not sent to the product packaging process. Further, after being removed from the production line as a defective product, the operation returns to S12 (not shown). Note that the test filter element that is evaluated as “NG” exceeding the upper limit reference value by the evaluation means is not missed in the visual inspection other than the case where the test filter element does not have the pressure loss within the standard. This includes cases where there are defects in the appearance such as crushing and overlapping of filter media that may occur. In either case, the filter medium is treated as a defective product.

  When the evaluation means (computer) evaluates that the pressure loss of the test filter element does not exceed the upper limit reference value, an “OK” signal is sent to a judgment lamp, which is a warning means, and “OK” is displayed. .

  Next, the pressure loss data of the test filter element evaluated as “OK” without exceeding the upper limit reference value is further compared with the lower limit reference value stored by the evaluation means (computer), and the pressure of the test filter element is determined. It is evaluated whether the loss is below the lower limit reference value (S16).

  When the evaluation means (computer) evaluates that the pressure loss of the test filter element is below the lower limit reference value, it sends a “NG” signal to the warning pole, a signal pole with a buzzer that informs the evaluation result by sound, and a judgment lamp A warning is issued.

  The test filter element evaluated as “NG” below the lower limit reference value by the evaluation means is removed from the production line as a defective product and is not sent to the product packaging process. Further, after being removed from the production line as a defective product, the operation returns to S12 (not shown). In addition, the test filter element evaluated as “NG” below the lower limit reference value by the evaluation means is not missed in the visual inspection other than the case where the test filter element does not have the pressure loss within the reference. In some cases, there are defects in the appearance such as tearing of the filter medium and sealing failure between the filter medium and the frame material, which are treated as defective products.

  When the evaluation means (computer) evaluates that the pressure loss of the test filter element does not fall below the lower limit reference value, an “OK” signal is sent to a judgment lamp, which is a warning means, and “OK” is displayed, The product is sent to the packaging process.

  When the pressure loss of the test filter element does not exceed the upper limit reference value, the process returns to S12, the inspections of S12 to S16 are repeated by a predetermined amount, and then the process ends.

  Note that the present invention is not limited to the above-described examples. For example, the inspection method and apparatus of the present invention are used separately from the filter element production line, and can be freely used within the scope of the claims. It can be changed and implemented.

The perspective view of the duct main body of the test | inspection apparatus used for the test | inspection method of this invention. The perspective view which shows the state which arrange | positions a cover element on the porous member of the duct main body upper part of the inspection apparatus of this invention, and mounts or removes a filter element on it. The top view which showed the example which has distribute | arranged the inspection apparatus of this invention in the manufacturing line of the filter element. The flowchart which shows one Example of the inspection method of this invention. The flowchart which shows another Example of the test | inspection method of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 ... Duct body 12 ... Porous member 13 ... Air discharge duct 13
DESCRIPTION OF SYMBOLS 14 ... Ventilator 15 ... Cover member 16 ... Damper for air volume adjustment 18 ... Insertion hole 19 ... Differential pressure measuring meter 20 ... Control box E ... Filter element

Claims (7)

A method for inspecting the quality of a filter element,
Measure the pressure loss at the airflow value arbitrarily set for the upper limit reference filter element having the upper limit value of pressure loss, and the obtained measured value as the upper limit reference value,
Next, for the test filter element to inspect the quality, measure the pressure loss at the same air flow value as the upper limit reference filter element,
Next, the measured value of the test filter element is compared with the upper limit reference value, and when it is evaluated that the measured value of the test filter element exceeds the upper limit reference value, a warning is issued. A method for inspecting the quality of filter elements.   Measure the pressure loss at an arbitrarily set air flow value for the lower limit reference filter element with the lower limit of pressure loss, and use the measured value as the lower limit reference value. The lower limit reference value and the measured value of the test filter element 2. A method for inspecting the quality of a filter element according to claim 1, wherein a warning is issued when it is evaluated that the measured value of the test filter element falls below a lower reference value.   3. A method for inspecting the quality of a filter element according to claim 1 or 2, wherein the quality is inspected during the manufacturing process of the filter element.   When the measured value of the test filter element is compared with the upper limit reference value or the lower limit reference value and the measured value of the test filter element is evaluated to exceed the upper limit reference value, or the lower limit reference value 4. The method for inspecting the quality of a filter element according to claim 3, wherein when the evaluation is below the reference value, the evaluation result is fed back to the manufacturing process of the filter element. A device for inspecting the quality of a filter element,
A tubular duct body;
A porous member disposed at the top of the duct body;
A cover member having an opening corresponding to the size of the outlet surface portion of the filter element;
Air discharge means capable of arbitrarily setting the amount of air flowing in the duct body;
The porous member of the duct body is covered with a cover member, the filter element is placed with the outlet surface portion of the filter element aligned with the opening of the cover member, and arbitrarily set in the duct body by the air discharge means A differential pressure gauge that measures the pressure loss of the filter element when air is flowed at a flow rate of
Evaluation means for evaluating the quality of the filter element based on a measured value of the pressure loss of the filter element measured by the differential pressure gauge, and warning means for issuing a warning based on the evaluation result by the evaluation means A filter element quality inspection device.   6. The filter element quality inspection apparatus according to claim 5, wherein the filter element quality inspection apparatus is arranged in a manufacturing process of the filter element.   7. The filter element quality inspection apparatus according to claim 6, wherein the evaluation result of the evaluation means is fed back to the filter element manufacturing process.

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