JP2018163038A - Mass measurement fixture and mass measurement system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To more stably and accurately measure mass (weight) equivalent to an amount of adsorption and an amount of desorption or the like.SOLUTION: The mass measurement fixture comprises: a frame interposed between a measurement object and a mass measurement device; a joint part connected via at least a pair of universal joints to the frame, and provided with a first gas channel for outputting gas supplied from the outside via one universal joint to the measurement object and a second gas channel for making the gas discharged from the measurement object flow via the other universal joint to the outside; and fixing means for fixing the connection part of the joint part with the outside.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a mass measurement jig and a mass measurement system.

  Patent Document 1 listed below discloses a canister that temporarily adsorbs fuel vapor evaporated in a fuel tank and an adsorbent containing silica gel as a component used in the canister. This canister is provided in automobiles, ships and the like to suppress the discharge of fuel vapor volatilized in the fuel tank to the atmosphere, and can repeatedly perform adsorption and desorption (desorption) of fuel vapor. It has an adsorbent.

JP 2004-000856 A

  By the way, as an evaluation method for confirming the performance of the canister, the amount of adsorbed fuel vapor (gas) adsorbed on the adsorbent and the amount of gas desorbed (desorbed) from the adsorbent are calculated based on the weight of the adsorbent. There is a way to measure. In the above measurement of adsorption amount and desorption amount (mass measurement), it is necessary to supply adsorption gas to the canister placed on the electronic balance or supply desorption gas to the canister. In this state, weight measurement is performed.

  However, in such weight measurement, disturbance is likely to occur due to the canister being connected to an external device, and it has been difficult to stably and accurately measure the amount of adsorption and desorption. Therefore, in order to evaluate the performance of the adsorbent incorporated in the canister or the like, a technique for more stably and accurately measuring the adsorption amount and the desorption amount by weight has been desired.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to more stably and accurately measure a mass (weight) corresponding to an adsorption amount, a desorption amount, and the like.

  In order to achieve the above-mentioned object, in the present invention, as a first solving means related to a mass measuring jig, a gantry interposed between a measurement object and a mass measuring device and at least a pair of universal joints are used. A first gas flow path connected to a gantry and outputting gas supplied from the outside toward the measurement object via one of the universal joints, and the gas discharged from the measurement object A means is provided that includes a joint portion including a second gas flow channel that flows out to the outside through the other universal joint, and a fixing means that fixes a connection portion between the joint portion and the outside.

  In the present invention, as the second solving means relating to the mass measuring jig, in the first solving means, the mass measuring device is interposed between the gantry and the mass measuring device, and the gantry is attached to the mass measuring device with low friction. A means of further providing an auxiliary support part to be supported is adopted.

  In the present invention, as a third solving means relating to the mass measuring jig, in the first or second solving means, the joint portion is connected to one universal joint in addition to the pair of universal joints. A first connecting pipe, one end connected to the other end of the first connecting pipe, a second connecting pipe connected to the other universal joint, and one end connected to the second connecting pipe. A second rotary joint connected to the other end of the connecting pipe, and the frame is connected to the other end of the first rotary joint and the other end of the second rotary joint.

  In the present invention, as a fourth solving means related to the mass measuring jig, in any one of the first to third solving means, the measuring object is a canister that adsorbs / desorbs the gas. Is adopted.

  In the present invention, as a solving means related to the mass measuring system, means including the mass measuring jig according to any one of the first to third solving means and the mass measuring device is adopted.

  According to the present invention, it is possible to more stably and accurately measure a mass (weight) corresponding to an adsorption amount, a desorption amount, and the like.

It is a front view of gas adsorption amount measuring system A concerning one embodiment of the present invention. It is a right view of the gas adsorption amount measuring system A which concerns on one Embodiment of this invention. It is a top view of gas adsorption amount measurement system A concerning one embodiment of the present invention. It is a top view which shows the function of the gas adsorption amount measuring jig T which concerns on one Embodiment of this invention.

Hereinafter, an embodiment of the present invention will be described with reference to the drawings.
First, a canister W (measurement target) that is a measurement target of the gas adsorption amount measurement system A according to the present embodiment will be described. The canister W is a device that prevents the fuel vapor from being released into the atmosphere by adsorbing / desorbing the fuel vapor (gas) evaporated in the fuel tank, as is well known. The canister W is a rectangular container having a pair of input / output ports, that is, a first input / output port w1 and a second input / output port w2, as shown in the figure, and contains an adsorbent (activated carbon) inside. ing.

  The first input / output port w <b> 1 and the second input / output port w <b> 2 are for allowing the adsorbent to circulate the adsorbing fuel vapor or to circulate the desorption air (outside air) to the adsorbent. That is, in the canister W, when the fuel vapor is adsorbed by the adsorbent, the fuel vapor flows from one of the first input / output port w1 and the second input / output port w2 and is partially adsorbed from the other. Is discharged. In the canister W, when the fuel vapor is desorbed from the adsorbent, air flows from one of the first input / output port w1 and the second input / output port w2, and the mixed gas of fuel vapor and air from the other. Is discharged.

  The gas adsorption amount measurement system A according to the present embodiment is a mass measurement system that measures the adsorption amount mk and desorption amount md of the test gas in such a canister W as mass (weight). The test gas is a simulated gas supplied to the canister W as a substitute for fuel vapor in order to test the performance of the canister W. As shown in FIGS. 1 to 3, the gas adsorption amount measuring system A includes an electronic balance S and a gas adsorption amount measuring jig T.

  Although not shown, in the test of the canister W using the gas adsorption amount measuring system A, the test gas for adsorption or the desorption air is supplied to the canister W from a gas supply device provided outside. .

  The electronic balance S is a mass measuring device that measures mass (weight) with high accuracy, as is well known. The electronic balance S includes a top plate s1 on which a measurement target is placed, a display unit s2 that displays the mass of the measurement target, an operation unit s3 that receives a user's instruction, and the like. Such an electronic balance S is installed so that the perpendicular direction of the top plate s1 is the gravity direction (vertical direction), that is, the top plate s1 is horizontal, and the user operates the operation unit s3. The mass (weight) of the measurement target placed on the top s1 is measured based on the measurement conditions set by this, and the measurement result is displayed on the display unit s2.

  The gas adsorption amount measuring jig T is interposed between the canister W and the gas supply device, and reduces disturbance caused by the connection between the canister W and the gas supply device, that is, mass variation in the mass measurement by the electronic balance S. It is a mass measurement jig. The gas adsorption amount measuring jig T includes a support base 1, a first universal joint 2, a first connection pipe 3, a first rotary joint 4, a canister installation base 5, a second rotary joint 6, a second connection pipe 7, 2 A universal joint 8, four base fixing columns 9, a floating base 10, an auxiliary base 11, and three ball bears 12 are provided.

  Of these components, the first universal joint 2, the first rotary joint 4, the second rotary joint 6 and the second universal joint 8 are provided with one end and the other end in addition to the joint mechanism as a basic structure. An internal flow path is provided for connecting the two. That is, the 1st universal joint 2, the 1st connection pipe 3, and the 1st rotary joint 4 comprise the 1st gas flow path through which test gas or air circulates as a whole, and the 2nd rotary joint 6, the 2nd connection The pipe 7 and the second universal joint 8 also constitute a second gas flow path through which the test gas or air flows as a whole.

  The support base 1 is a plate member bent in an L shape as shown in the figure, and includes a base 1a and a support 1b. The base 1a is a flat plate portion in a horizontal posture, and is a part on which the electronic balance S is placed. The support portion 1 b is a flat plate portion bent at a right angle from the base portion 1 a and supports each end of the first universal joint 2 and the second universal joint 8. Note that one end of the first universal joint 2 and one end of the second universal joint 8 are one end of the first universal joint 2 and an external connection portion of the second universal joint 8.

  The first universal joint 2 is a bendable substantially tubular member, and is fixed to the support portion 1b so that the extending direction of the tube axis including one end is a horizontal direction. The first universal joint 2 has one end connected to the gas supply device via a predetermined external pipe and the other end connected to the first connection pipe 3. Such a first universal joint 2 connects the first connecting pipe 3 to the external pipe so that it can be bent and rotated around the pipe axis.

  The first connection pipe 3 is a straight pipe having a predetermined length extending in a horizontal posture, one end of the first universal joint 2 is connected to one end, and one end of the first rotary joint 4 is connected to the other end. ing. The first rotary joint 4 is an angle joint that connects the horizontal first connecting pipe 3 to the horizontal canister installation base 5.

  That is, the first rotary joint 4 is an L-shaped member, the other end of the first connection pipe 3 is connected to one end, and the canister installation base 5 is fixed to the other end orthogonal to the one end. Such a first rotary joint 4 connects the first connecting pipe 3 to the canister installation base 5 so as to be rotatable in a horizontal plane.

  The canister installation base 5 is a substantially rectangular flat plate that includes first to fourth sides 5a to 5d that are orthogonal to each other and on which the canister W is placed. The canister installation base 5 has a pair of openings formed in the vicinity of the first side 5a, and the other end of the first rotary joint 4 is inserted and fixed to one side (the fourth side 5d side) of the opening. The other end of the second rotary joint 6 is inserted and fixed to the other side (second side 5b side) of the opening.

  In addition, the canister installation base 5 is bent in the vicinity of the four sides so that the flatness of the upper surface is not impaired. In such a canister installation base 5, a rectangular area (canister placement area) in which the canister W is placed is set at the center of the upper surface.

  The second rotary joint 6 is an angle joint that connects the canister installation base 5 in a horizontal posture to the second connection pipe 7 in the same horizontal posture, and has the same shape as the first rotary joint 4 described above. That is, the second rotary joint 6 is an L-shaped member like the first rotary joint 4, the other end of the second connection pipe 7 is connected to one end, and the canister installation base 5 is fixed to the other end. ing. Such a second rotary joint 6 connects the second connecting pipe 7 to the canister installation base 5 so as to be rotatable in a horizontal plane.

  The second connection pipe 7 is a straight pipe having a predetermined length extending in a horizontal posture, and the other end of the second universal joint 8 is connected to one end, and the other end of the second rotary joint 6 is connected to the other end. Yes. The second connection pipe 7 has the same shape as the first connection pipe 3. The second universal joint 8 is a bendable substantially tubular member, and has the same shape as the first universal joint 2 described above.

  The second universal joint 8 is fixed to the support portion 1b of the support base 1 so that the extending direction of the tube shaft including one end is the horizontal direction. The second universal joint 8 has one end connected to the gas supply device via a predetermined external pipe and the other end connected to one end of the second connection pipe 7. Such a second universal joint 8 connects the second connecting pipe 7 to the external pipe so that it can be bent and rotated around the pipe axis.

  The four base fixing columns 9 are cylindrical members having a predetermined length, and are provided at locations (four locations) outside by a predetermined distance from each vertex of the canister placement region described above. That is, one end of each of the four base fixing columns 9 is fixed to a portion near the outside of the canister placement region of the canister installation base 5, and the other end is fixed to the floating base 10.

  The floating base 10 is a flat plate fixed to the canister installation base 5 through the base fixing column 9. That is, the floating base 10 is fixed to the other ends of the four base fixing columns 9 and is opposed to the canister installation base 5 in parallel with a predetermined interval. Between the floating base 10 and the canister installation base 5, the first connection pipe 3 and the second connection pipe 7 described above are arranged.

  Here, the canister installation base 5, the floating base 10 and the four base fixing columns 9 constitute a floating frame F (frame) interposed between the canister W (measurement object) and the electronic balance S (mass measuring device). doing.

  In addition, a pair of universal joints (first universal joint 2 and second universal joint 8), a pair of connecting pipes (first connecting pipe 3 and second connecting pipe 7), and a pair of rotary joints (first rotary joint 4 and second universal joint 8). 2 rotary joint 6) comprises the joint part J interposed between the said floating mount F and the support base 1. FIG.

  The joint portion J is connected to the floating frame F through at least a pair of universal joints (first universal joint 2 and second universal joint 8), and gas (test gas or gas) supplied from an external gas supply device. A first gas flow path for outputting air) to the canister W (measurement object) via one universal joint (first universal joint 2), and gas discharged from the canister W (measurement object) ( A second gas flow path for allowing the test gas or mixed gas) to flow out to the external gas supply device via the other universal joint (second universal joint 8).

  That is, since such a joint portion J is provided between the floating mount F and the support base 1, the support base 1 can move up and down and move horizontally with respect to the support base 1. In addition, the support base 1 fixes the connection part with the exterior in the joint part J, ie, the end of the 1st universal joint 2, and the end of the 2nd universal joint 8, and is a fixing means in this invention.

  In the joint portion J, the first universal joint 2 is connected to the first rotary joint 4 via the first connection pipe 3, and the second universal joint 8 is connected to the second rotary joint 6 via the second connection pipe 7. 2 and 3, the pair of rotary joints (the first rotary joint 4 and the second rotary joint 6) are connected to the first side 5 a of the canister installation base 5. The pair of universal joints (the first universal joint 2 and the second universal joint 8) are located in the vicinity of the third side 5 c of the canister installation base 5.

  The floating mount F is connected to the canister W through a pair of pipes, that is, a first gas hose H1 and a second gas hose H2. That is, the first gas hose H1 has one end connected to the first rotary joint 4 and the other end connected to the first input / output port w1 of the canister W. The second gas hose H2 has one end connected to the second rotary joint 6 and the other end connected to the second input / output port w2 of the canister W.

  The auxiliary base 11 is a flat plate installed on the top plate s1 of the electronic balance S described above. Three ball bears 12 are provided on the upper surface of the auxiliary base 11. The three ball bears 12 are provided on the upper surface of the auxiliary base 11 in a positional relationship corresponding to each vertex of an equilateral triangle or an isosceles triangle.

  Each of the ball bears 12 includes a rotatable sphere (ball), and supports the lower surface of the floating base 10 described above on the surface of the sphere. The auxiliary base 11 and the ball bear 12 are interposed between the floating gantry F and the top plate s1 of the electronic balance S, and support the floating gantry F on the top plate s1 of the electronic balance S with low friction. Part E is configured.

  Next, the operation and effect of the gas adsorption amount measuring system A according to the present embodiment configured as described above will be described in detail.

  When the adsorption amount mk of the canister W is measured using the gas adsorption amount measuring system A, the test gas is supplied from the external gas supply device to the first universal joint 2 and a part of the test gas is supplied from the second universal joint 8. Is recovered in the gas supply device. That is, the test gas passes through the first gas flow path composed of the first universal joint 2, the first connection pipe 3, and the first rotary joint 4, and the first gas hose H1, and passes through the first input / output port w1 to the canister W. It flows into the interior and part of it is absorbed by the adsorbent.

  The remaining portion of the test gas that has not been adsorbed by the adsorbent is the second gas consisting of the second gas hose H2, the second rotary joint 6, the second connection pipe 7, and the eighth universal joint 8 from the second input / output port w2. It flows to the gas supply device via the flow path. The canister W increases in mass by adsorbing a part of such test gas with an adsorbent. The electronic balance S measures such an increase in mass as an adsorption amount mk in the canister W and displays it on the display unit s2.

  On the other hand, when the desorption amount md of the canister W is measured using the gas adsorption amount measurement system A, air is supplied from the external gas supply device to the first universal joint 2, and air is supplied from the second universal joint 8. A mixed gas with the test gas is collected in the gas supply device. That is, air flows from the first universal joint 2 through the first connection pipe 3, the first rotary joint 4, and the first gas hose H1 into the canister W through the first input / output port w1 and acts on the adsorbent. .

  The test gas desorbed from the adsorbent by the action of air is mixed with air to become a mixed gas. From the second input / output port w2, the second gas hose H2, the second rotary joint 6, the second connection pipe 7, and the second gas are mixed. 8 Flows to the gas supply device via the universal joint 8. The mass of the canister W is reduced by desorption of the test gas from the adsorbent due to the action of air. The electronic balance S measures such a decrease in mass as the desorption amount md in the canister W and displays it on the display unit s2.

  Here, in this gas adsorption amount measuring system A, one end of the first universal joint 2 and one end of the second universal joint 8 connected to the gas supply device via an external pipe are fixed to the support base 1. The floating mount F is connected to the support base 1 via a joint portion J including the first universal joint 2 and the second universal joint 8. Further, the floating gantry F is supported on the top plate s1 of the electronic balance S with low friction by the auxiliary support portion E including the auxiliary base 11 and the ball bear 12.

  In such a state, the electronic balance S is connected to the other end side of the first universal joint 2 and the second universal joint 8 in the canister W, the floating mount F, the auxiliary support E and the joint J (that is, the first universal joint 2). And the other end of the second universal joint 8 and the mass of the first connecting pipe 3, the first rotary joint 4, the second rotary joint 6 and the second connecting pipe 7).

  Further, when measuring the adsorption amount mk, a test gas is supplied to one end of the first universal joint 2 from an external gas supply device, and fluctuations in the supply pressure of the test gas disturb the measurement of the adsorption amount mk in the electronic balance S. Acts as When measuring the desorption amount md, air is supplied from an external gas supply device to one end of the first universal joint 2, and fluctuations in the supply pressure of this air disturb the measurement of the desorption amount md in the electronic balance S. Acts as

  However, in the gas adsorption amount measuring system A according to the present embodiment, one end of the joint portion J is vertically oriented with respect to the one end of the first universal joint 2 and one end of the second universal joint 8, that is, the support base 1 that is a fixed system ( It is possible to bend in the vertical direction) and in the left-right direction (horizontal direction), and the other end of the joint J is in the left-right direction (horizontal direction) to the floating mount F via the first rotary joint 4 and the second rotary joint 6. Therefore, the fluctuations in the supply pressure of the test gas and air are absorbed by the floating base F moving in the horizontal direction on the top plate s1 of the electronic balance S as shown in FIG.

  That is, according to the gas adsorption amount measuring system A according to the present embodiment, the external force (disturbance) acting on the canister W when the test gas or air is supplied from the gas supply device to the canister W, that is, the top plate s1 of the electronic balance S. It is possible to effectively suppress disturbance to the mass measurement due to. Therefore, according to the gas adsorption amount measuring system A according to the present embodiment, it is possible to more stably and accurately measure the adsorption amount mk and the desorption amount md as masses (weights).

In addition, this invention is not limited to the said embodiment, For example, the following modifications can be considered.
(1) In the above embodiment, the auxiliary support portion E including the auxiliary base 11 and the ball bear 12 is provided, but the present invention is not limited to this. For example, when the surface of the top plate s1 of the electronic balance S is formed of a material having a low coefficient of friction, the auxiliary support portion E is omitted, and the floating base 10 of the floating mount F is directly installed on the top plate s1. May be.

(2) In the above embodiment, the gantry (floating gantry F) is constituted by the canister installation base 5, the floating base 10, and the four base fixing columns 9, but the present invention is not limited to this. For example, the base fixing column 9 and the floating base 10 are deleted by arranging the joint portion J on the upper side instead of the lower side of the canister installation base 5, and the canister installation base 5 is directly installed on the top plate s 1 of the electronic balance S. May be.

(3) In the above embodiment, a pair of universal joints (first universal joint 2 and second universal joint 8), a pair of connection pipes (first connection pipe 3 and second connection pipe 7), and a pair of rotary joints (first Although the joint portion J is composed of the first rotary joint 4 and the second rotary joint 6), the present invention is not limited to this. For example, a configuration in which the first universal joint 2 and the first rotary joint 4 are directly connected and the second universal joint 8 and the second rotary joint 6 are directly connected may be employed.

A Gas adsorption measurement system E Auxiliary support F Floating frame (frame)
J Joint part S Electronic balance (mass measuring device)
s1 Top plate s2 Display unit s3 Operation unit T Gas adsorption amount measurement jig W Canister (measurement object)
w1 first input / output port w2 second input / output port H1 first gas hose H2 second gas hose 1 support base (fixing means)
2 1st universal joint 3 1st connection pipe 4 1st rotary joint 5 canister installation base 5a 1st edge 5b 2nd edge 5c 3rd edge 5d 4th edge 6 2nd rotary joint 7 1st connection pipe 8 2nd universal joint 9 Base fixed support 10 Floating base 11 Auxiliary base 12 Ball bear

Claims (5)

A stand interposed between the measurement object and the mass measuring device;
A first gas flow path that is connected to the gantry via at least a pair of universal joints, and outputs a gas supplied from the outside toward the measurement object via the one universal joint; and the measurement A joint portion comprising a second gas flow path for allowing the gas discharged from the object to flow outside through the other universal joint;
A mass measuring jig comprising: fixing means for fixing a connection portion of the joint portion to the outside.   The mass measurement jig according to claim 1, further comprising an auxiliary support portion that is interposed between the gantry and the mass measurement device, and that supports the gantry to the mass measurement device with low friction. The joint portion is in addition to the pair of universal joints,
A first connecting pipe having one end connected to one of the universal joints;
A first rotary joint having one end connected to the other end of the first connecting pipe;
A second connecting pipe having one end connected to the other universal joint;
A second rotary joint having one end connected to the other end of the second connection pipe,
The mass measuring jig according to claim 1, wherein the gantry is connected to the other end of the first rotary joint and the other end of the second rotary joint.   The mass measurement jig according to claim 1, wherein the measurement object is a canister that adsorbs / desorbs the gas.   A mass measurement system comprising the mass measurement jig according to claim 1 and the mass measurement device.

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