JP6800792B2 - Mass measurement jig and mass measurement system - Google Patents

Description

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

Patent Document 1 below discloses a canister that temporarily adsorbs fuel vapor evaporated in a fuel tank and an adsorbent containing silica gel used in the canister as a component. This canister is installed in automobiles, ships, etc. in order to suppress the discharge of fuel vapor volatilized in the fuel tank to the atmosphere, and can repeatedly adsorb and desorb (desorb) fuel vapor. Equipped with an adsorbent.

Japanese Unexamined Patent Publication No. 2004-000856

By the way, as an evaluation method for confirming the performance of the canister, the weight of the adsorbent is determined by determining the amount of fuel vapor (gas) adsorbed on the adsorbent and the amount of gas desorbed (desorbed) from the adsorbent. There is a way to measure. In the above measurement of adsorption amount and attachment / detachment amount (mass measurement), it is necessary to supply adsorption gas to the canister placed on the electronic balance or supply attachment / detachment gas to the canister, so the canister is connected to an external device. The weight will be measured in this state.

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

The present invention has been made in view of the above circumstances, and an object of the present invention 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 object, in the present invention, as the first solution for the mass measuring jig, the pedestal interposed between the measurement object and the mass measuring device and at least a pair of universal joints are used. A first gas flow path that is connected to the gantry and outputs 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 adopted in which a joint portion including a second gas flow path that flows out to the outside through the other universal joint and a fixing means for fixing the connection portion with the outside in the joint portion are provided.

In the present invention, as a second solution for a mass measuring jig, in the first solution, the pedestal is interposed between the gantry and the mass measuring device, and the pedestal is attached to the mass measuring device with low friction. A means of further providing an auxiliary support portion for supporting is adopted.

In the present invention, as a third solution relating to the mass measuring jig, in the first or second solution, the joint portion is connected to the universal joint at one end in addition to the pair of universal joints. A first connecting pipe to be formed, 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, and one end having the second. A means is adopted in which a second rotary joint connected to the other end of the connecting pipe is provided, and the gantry 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 solution according to the mass measuring jig, in any of the first to third solutions, the measurement object is a canister that adsorbs / desorbs the gas. Is adopted.

In the present invention, as a solution means for a mass measurement system, a means for providing a mass measurement jig according to any one of the first to third solutions and the mass measurement device is adopted.

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

It is a front view of the gas adsorption amount measurement system A which concerns on one Embodiment of this invention. It is a right side view of the gas adsorption amount measurement system A which concerns on one Embodiment of this invention. It is a top view of the gas adsorption amount measurement system A which concerns on one Embodiment of this 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, the canister W (measurement target) to be measured by the gas adsorption amount measurement system A according to the present embodiment will be described. As is well known, 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. Such a canister W is a rectangular container provided with 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 houses an adsorbent (activated carbon) inside. ing.

The first input / output port w1 and the second input / output port w2 are for circulating fuel vapor for adsorption through the adsorbent, or for circulating desorbed air (outside air) to the adsorbent. That is, in this canister W, when the fuel vapor is adsorbed on the adsorbent, the fuel gas flows in from one of the first input / output port w1 and the second input / output port w2, and a part of the fuel gas is adsorbed from the other. Is discharged. Further, in this canister W, when the fuel vapor is desorbed from the adsorbent, air flows in from one of the first input / output port w1 and the second input / output port w2, and a mixed gas of the 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 the 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 the fuel vapor in order to test the performance of the canister W. As shown in FIGS. 1 to 3, the gas adsorption amount measurement system A includes an electronic balance S and a gas adsorption amount measurement jig T.

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

As is well known, the electronic balance S is a mass measuring device that measures mass (weight) with high accuracy. 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 instructions from the user, and the like. Such an electronic balance S is installed so that the vertical direction of the top plate s1 is the direction of gravity (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 plate s1 is measured based on the measurement conditions set accordingly, and the result of this measurement 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 fluctuation in mass measurement by the electronic balance S. It is a mass measuring jig. The gas adsorption amount measuring jig T includes a support base 1, a first universal joint 2, a first connecting pipe 3, a first rotary joint 4, a canister installation base 5, a second rotary joint 6, a second connecting pipe 7, and a second. It includes 2 universal joints 8, 4 base fixing columns 9, a floating base 10, an auxiliary base 11, and 3 ball bears 12.

Of these components, the first universal joint 2, the first rotary joint 4, the second rotary joint 6, and the second universal joint 8 have one end and the other end in addition to the joint mechanism as the basic structure. It is provided with an internal flow path that connects the spaces. That is, the first universal joint 2, the first connecting pipe 3, and the first rotary joint 4 constitute a first gas flow path through which test gas or air flows as a whole, and the second rotary joint 6, the second connection. The pipe 7 and the second universal joint 8 also form a second gas flow path through which the test gas or air flows as a whole.

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

The first universal joint 2 is a flexible, substantially tubular member, and is fixed to the support portion 1b so that the extending direction of the pipe shaft including one end is horizontal. One end of the first universal joint 2 is connected to the gas supply device via a predetermined external pipe, and the other end is connected to the first connection pipe 3. In such a first universal joint 2, the first connecting pipe 3 is flexibly and rotatably connected to the external pipe around the pipe axis.

The first connecting pipe 3 is a straight pipe having a predetermined length extending in a horizontal posture, and the other 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 first connecting pipe 3 in the horizontal posture to the canister installation base 5 in the same horizontal posture.

That is, the first rotary joint 4 is an L-shaped member, the other end of the first connecting pipe 3 is connected to one end, and the canister installation base 5 is fixed to the other end orthogonal to 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 having first to fourth sides 5a to 5d 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 of the openings (the fourth side 5d side). 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 such a canister installation base 5, the portions near the four sides are bent so that the flatness of the upper surface is not impaired. Further, in such a canister installation base 5, a rectangular area (canister mounting area) on which the canister W is placed is set in the central portion of the upper surface.

The second rotary joint 6 is an angle joint that connects the canister installation base 5 in the horizontal posture to the second connecting 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 connecting 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 connecting 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 one end of the second rotary joint 6 is connected to the other end. There is. The second connecting pipe 7 has the same shape as the first connecting pipe 3. The second universal joint 8 is a flexible, 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 pipe shaft including one end is the horizontal direction. Further, one end of the second universal joint 8 is connected to the gas supply device via a predetermined external pipe, and the other end is connected to one end of the second connection pipe 7. In such a second universal joint 8, the second connecting pipe 7 is flexibly and rotatably connected to the external pipe around the pipe axis.

The four base fixing columns 9 are columnar members having a predetermined length, and are provided at locations (4 locations) outside by a predetermined distance from each apex of the canister mounting 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 mounting area 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 via the base fixing support column 9. That is, the floating base 10 is fixed to the other ends of the four base fixing columns 9, and faces the canister installation base 5 in parallel with a predetermined interval. The first connecting pipe 3 and the second connecting pipe 7 described above are arranged between the floating base 10 and the canister installation base 5.

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

Further, 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 first). The 2 rotary joint 6) constitutes a joint portion J interposed between the floating pedestal F and the support base 1.

The joint portion J is connected to the floating gantry F via at least a pair of universal joints (first universal joint 2 and second universal joint 8), and is a gas (test gas or test gas) supplied from an external gas supply device. A first gas flow path that outputs air) to the canister W (measurement target) via one universal joint (first universal joint 2), and a gas discharged from the canister W (measurement target) (measurement target). It is provided with a second gas flow path that allows a test gas or a mixed gas) to flow out to an 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 pedestal F and the support base 1, the support base 1 can move up and down and horizontally with respect to the support base 1. The support base 1 fixes a connection portion of the joint portion J with the outside, that is, one end of the first universal joint 2 and one end of the second universal joint 8, and is the fixing means in the present invention.

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

Further, the floating pedestal F is connected to the canister W via a pair of pipes, that is, a first gas hose H1 and a second gas hose H2. That is, one end of the first gas hose H1 is connected to one end of the first rotary joint 4, and the other end is connected to the first input / output port w1 of the canister W. Further, one end of the second gas hose H2 is connected to one end of the second rotary joint 6, and the other end is 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 these ball bears 12 is provided with a rotatable sphere (ball), and the surface of the sphere supports the lower surface of the floating base 10 described above. Such an auxiliary base 11 and a ball bear 12 are interposed between the floating pedestal F and the top plate s1 of the electronic balance S, and support the floating pedestal F on the top plate s1 of the electronic balance S with low friction. It constitutes a part E.

Next, the operation and the effect of the gas adsorption amount measurement 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 by using this gas adsorption amount measurement 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 collected 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 connecting pipe 3, and the first rotary joint 4 and the first gas hose H1, and passes from the first input / output port w1 to the canister W. Part of it is absorbed by the adsorbent.

The test gas is a second gas in which the balance not adsorbed by the adsorbent is composed of the second gas hose H2, the second rotary joint 6, the second connecting 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 mass of the canister W increases by adsorbing a part of such a test gas with an adsorbent. The electronic balance S measures such an increase in mass as the amount of adsorption 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 by using this gas adsorption amount measurement system A, air is supplied to the first universal joint 2 from an external gas supply device, and air is supplied from the second universal joint 8. The mixed gas with the test gas is recovered in the gas supply device. That is, air flows from the first universal joint 2 to the canister W from the first input / output port w1 via the first connecting pipe 3, the first rotary joint 4, and the first gas hose H1 and acts on the adsorbent. ..

Then, the test gas desorbed from the adsorbent by the action of air is mixed with air to become a mixed gas, and the second gas hose H2, the second rotary joint 6, the second connecting pipe 7, and the second input / output port w2. 8 Flows to the gas supply device via the universal joint 8. The mass of the canister W is reduced by desorbing the test gas from the adsorbent due to the action of such air. The electronic balance S measures such a decrease in mass as a 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. Further, the floating pedestal 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 pedestal F is supported by the auxiliary support portion E including the auxiliary base 11 and the ball bear 12 on the top plate s1 of the electronic balance S with low friction.

In such a state, the electronic balance S is the other end side of the first universal joint 2 and the second universal joint 8 (that is, the first universal joint 2) in the canister W, the floating pedestal F, the auxiliary support portion E, and the joint portion J. The other end of the second universal joint 8, the other end of the second universal joint 8, and the masses of the first connecting pipe 3, the first rotary joint 4, the second rotary joint 6 and the second connecting pipe 7) are measured.

Further, when measuring the adsorption amount mk, a test gas 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 test gas disturb the measurement of the adsorption amount mk on the electronic balance S. Acts as. Further, 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 the fluctuation of the air supply pressure disturbs the measurement of the desorption amount md in the electronic balance S. Acts as.

However, in the gas adsorption amount measurement system A according to the present embodiment, one end of the joint portion J is in the vertical direction (one end of the first universal joint 2 and one end of the second universal joint 8, that is, the support base 1 which is a fixed system). It can be bent in the vertical direction (vertical direction) and the left-right direction (horizontal direction), and the other end of the joint portion J is left-right direction (horizontal direction) to the floating gantry F via the first rotary joint 4 and the second rotary joint 6. As shown in FIG. 4, the fluctuation of the supply pressures of the test gas and the air is absorbed by the floating pedestal F moving in the horizontal direction on the top plate s1 of the electronic balance S.

That is, according to the gas adsorption amount measuring system A according to the present embodiment, an 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 the disturbance to the mass measurement by. Therefore, according to the gas adsorption amount measurement 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 the mass (weight).

The present invention is not limited to the above embodiment, and 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 thereto. For example, when the surface of the top plate s1 of the electronic balance S is made of a material having a low coefficient of friction, the auxiliary support portion E is omitted, and the floating base 10 of the floating frame F is directly installed on the top plate s1. You may.

(2) In the above embodiment, the pedestal (floating pedestal F) is composed of the canister installation base 5, the floating base 10, and the four base fixing columns 9, but the present invention is not limited thereto. For example, by arranging the joint portion J on the upper side of the canister installation base 5 instead of the lower side, the base fixing support 9 and the floating base 10 are deleted, and the canister installation base 5 is directly installed on the top plate s1 of the electronic balance S. You may.

(3) In the above embodiment, 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). Although the joint portion J is composed of 1 rotary joint 4 and 2nd rotary joint 6), the present invention is not limited to this. For example, a configuration may be adopted 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.

A Gas adsorption amount measurement system E Auxiliary support F Floating pedestal (mount)
J Joint S Electronic balance (mass measuring device)
s1 Top plate s2 Display unit s3 Operation unit T Gas adsorption amount measurement jig W Canister (measurement target)
w1 1st input / output port w2 2nd input / output port H1 1st gas hose H2 2nd 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 side 5b 2nd side 5c 3rd side 5d 4th side 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)

An intervening pedestal between the object to be measured and the mass measuring device,
A first gas flow path which is connected to the gantry via at least a pair of universal joints and outputs gas supplied from the outside toward the measurement object via one of the universal joints, and the measurement. A joint portion including a second gas flow path that allows the gas discharged from the object to flow out through the other universal joint, and a joint portion.
A mass measuring jig including a fixing means for fixing a connection portion with the outside in the joint portion. The mass measuring jig according to claim 1, further comprising an auxiliary support portion that is interposed between the gantry and the mass measuring device and supports the pedestal on the mass measuring device with low friction. In addition to the pair of universal joints, the joint portion
A first connecting pipe whose one end is connected to one of the universal joints,
A first rotary joint whose one end is connected to the other end of the first connecting pipe,
A second connecting pipe, one end of which is connected to the other universal joint,
A second rotary joint having one end connected to the other end of the second connecting pipe is provided.
The mass measuring jig according to claim 1 or 2, 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 measuring jig according to any one of claims 1 to 3, wherein the measurement object is a canister that adsorbs / desorbs the gas. A mass measurement system including the mass measurement jig according to any one of claims 1 to 3 and the mass measurement device.

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