JP2012057984A - Flow rate measuring device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a flow rate measuring device that easily and inexpensively suppresses projection of an adhesive into a sub-passage and deficiency in adhesive strength due to a variation of a remaining adhesive of an automatic adhesive coating device such as a dispenser during bonding of two or more members constituting the sub-passage without altering facilities such as the automatic adhesive coating device.SOLUTION: A flow rate measuring device 1 of the present invention is provided with a storage part 15 in which the adhesive 12 can be reserved at an adhesive coating start position of an adhesive coating groove part 20 which is previously set as a position where the coating of the adhesive 12 to the adhesive coating groove part 20 begins. Consequently, when the excessive amount of the adhesive is remained in a nozzle of the automatic adhesive coating device such as a dispenser, only an excessive adhesive 12 can be flowed into the reservoir part 15 and reserved to prevent the adhesive 12 from overflowing from the adhesive coating groove part 20 to leak to the sub-passage 5.

Description

  The present invention relates to a flow rate measuring device, and more particularly to a flow rate measuring device suitable for configuring an intake system of an automobile engine and detecting and controlling the intake air amount.

  In order to create a flow rate measuring device that enables stable measurement, it is necessary to accurately make a sub-passage that divides intake air from the main passage and has a flow sensor therein. This sub-passage is often configured by adhering two or more resin members with an adhesive.

  In order to create an accurate sub-passage, for example, to prevent the adhesive from protruding into the sub-passage due to excessive application at the application start position due to variations in the remaining adhesive in an automatic adhesive application device such as a dispenser. is important.

  As background art regarding stable adhesive application, there is JP-A 2004-167432 (Patent Document 1). In this publication, “in the adhesive application device, the clogging of the dispenser can be automatically detected and the clogging of the dispenser is automatically wiped out before the adhesive application of the next part is performed. Is described. The technique of patent document 1 is a countermeasure in equipment, and in this application, in order to solve a problem more simply and cheaply, the problem is solved by a countermeasure in the shape of the constituent member.

JP 2004-167432 A

  In the prior art, there has been an application where the amount of residual adhesive is excessive or too small at the application start position due to variations in the residual adhesive in an automatic adhesive application device such as a dispenser. Therefore, for example, in the case of an excessive amount, there is a possibility that the adhesive protrudes into the sub-passage where the flow rate sensor for measuring the air flow rate is arranged, thereby hindering stable flow rate measurement. In addition, when the amount is too small, the members at the application start position are not bonded to each other, and the shape of the sub-passage varies and the flow velocity distribution inside the sub-passage changes, which may hinder stable flow rate measurement.

  An object of the present invention is to provide a flow rate measuring device that can easily and inexpensively suppress the occurrence of an adhesive protruding into a sub-passage or insufficient adhesive force in bonding of two or more members constituting the sub-passage. Is to provide.

  The flow rate measuring device according to the present invention is provided with a storage part capable of storing an adhesive at a predetermined adhesive application start position of the adhesive application groove as a position at which application of the adhesive to the adhesive application groove is started. It is characterized by that.

  According to the present invention, the storage part capable of storing the adhesive is provided at the adhesive application start position of the adhesive application groove as a position for starting the application of the adhesive to the adhesive application groove. For example, when the amount of adhesive remaining in the nozzle of the automatic adhesive application device such as a dispenser is excessive, the adhesive can be stored by flowing into the storage part and the adhesive applied. It is possible to prevent overflowing from the groove and leaking into the auxiliary passage. When the amount of adhesive remaining in the nozzle is too small, an appropriate amount of adhesive can be applied to the adhesive application groove.

  As described above, the influence on the application due to the excessive or insufficient residual adhesive amount at the application start position due to the dispersion of the residual adhesive in the automatic adhesive application device such as a dispenser can be easily and inexpensively suppressed. . Thereby, the shape of a subchannel | path can be manufactured stably, and the flow rate measuring apparatus which can perform the stable flow rate measurement by this can be provided.

The figure explaining the structure of the flow volume measuring apparatus of this invention. The exploded view which shows a flow measurement apparatus from the cover member side. The exploded view which shows a flow measuring device from the base member side. The figure which shows the application pattern which apply | coats an adhesive agent to the adhesive agent application groove part of a base member. The figure which shows the structure of the storage part in Example 1. FIG. The figure which shows the structure of the storage part in Example 2. FIG. The figure which shows the structure of the storage part in Example 3. FIG. The figure which shows the structure of the storage part in Example 4. FIG.

Hereinafter, embodiments of the flow rate measuring device of the present invention will be described in detail with reference to the drawings.
The following embodiments according to the present invention relate to a flow rate measuring device used for measuring the flow rate of air sucked into an internal combustion engine for automobiles, and suppresses the occurrence of measurement errors in the flow rate measuring device, thereby stabilizing the flow rate. The structure which can perform is provided.

  The present invention is not limited to the constituent members of the flow rate measuring device, and it goes without saying that the same invention effect can be obtained for a flow rate measuring device equipped with a member other than the constituent members.

[Example 1]
FIG. 1 is a diagram illustrating the configuration of a flow rate measuring device according to the present invention, FIG. 2 is an exploded view showing the flow rate measuring device from the cover member side, and FIG. 3 is an exploded view showing the flow rate measuring device from the base member side. .

  As shown in FIG. 1, the flow rate measuring device 1 is disposed in a main passage 2 of a main pipe 3 connected to an intake passage of an internal combustion engine. The flow rate measuring device 1 is inserted into an insertion hole 4 formed in the main pipe 3 and is attached to the main pipe 3 in a cantilever structure, and a tip portion is located in the main passage 2 of the main pipe 3. In FIG. 1, the cover member 11 is omitted for convenience of describing the configuration of the flow rate measuring device 1.

  As shown in FIGS. 2 and 3, the flow measuring device 1 is an assembly of a housing member 10 (second member), a cover 11, a base member 8 (first member), and a plate-like circuit board 7.

  A sub-passage 5 is formed at the tip of the flow rate measuring device 1. The sub-passage 5 has a configuration for taking in part of the intake air 16 flowing through the main passage 2, and a sensor element (flow rate measuring element) 17 for measuring the flow rate of the intake air 16 is provided in the sub-passage 5. Is arranged. The sensor element 17 is mounted on one end of the plate-like circuit board 7, and the end of the circuit board 7 is disposed in the sub-passage 5 so that the flow rate can be measured. The circuit board 7 is electrically connected to a connector terminal 6 having terminals for power supply and signal output via an aluminum wire 18.

  The flow rate measuring device 1 is assembled by stacking a housing member 10, a cover member 11, and a circuit board 7 on a base member 8. The housing member 10 is a plastic part, and a connector 14 having a connector terminal 6 for electrically connecting the circuit board 7 and an external device is insert-molded.

  A part of the intake air 16 flowing through the main passage 2 flows into the sub-passage 5 located in the main passage 2 in a divided manner. Then, the flow rate of the divided air is detected by the sensor element 17, and the total flow rate (intake air amount) of the intake air sucked into the internal combustion engine is detected.

  The sub-passage 5 includes a sub-passage upstream portion 5A and a sub-passage downstream portion 5B, and the sub-passage upstream portion 5A bonds the housing member 10 as the first member and the base member 8 as the second member in combination with each other. Consists of. In the sub-passage upstream portion 5A, the open surface of the recessed groove formed in the mating surface of the base member 8 is closed by the mating surface of the housing member 10 to constitute a passage section having a closed cross section.

  The sub-passage 5 is provided in the sub-passage upstream portion 5A in order to allow the intake air 16 and the contaminants from the inlet of the sub-passage 5 to be centrifuged by a bypass portion disposed upstream of the sensor element 17. It has a bypass bypass 13.

  The auxiliary passage upstream portion 5A of the auxiliary passage 5 has an auxiliary passage inlet portion 5Aa that opens toward the upstream side of the intake air 16, extends from the auxiliary passage inlet portion 5Aa toward the downstream side of the intake air 16, and is downstream thereof. It curves smoothly from the end toward the base end of the flow rate measuring device 1. The base end is bent toward the upstream side of the intake air 16 and extends in a straight line, and the end is bent toward the front end side of the flow rate measuring device 1. It communicates with the opening 31.

  The sub-passage downstream portion 5B of the sub-passage 5 is configured by stacking and adhering the housing member 10 and the cover member 11 to each other, and extends from the opening 31 of the housing member 10 toward the downstream side. The sub-passage outlet 5Ba opens toward the downstream side of the intake air 16 at the end.

  The base member 8 has an adhesive application groove portion 20 to which the adhesive 12 is applied, and the housing member 10 has a ridge portion 19 that is inserted into the adhesive application groove portion 20 in combination with the base member 8. As shown in FIGS. 1 and 2, the adhesive application groove 20 is recessed so as to extend along the mating surface of the base member 8, and the ridge 19 is the mating surface of the housing member 10. And when the base member 8 is attached, it is protrudingly provided on the adhesive surface portion that closes the open surface of the adhesive application groove portion 20.

  The adhesive application groove portion 20 is formed in a spiral shape on the mating surface of the base member 8 so as to follow the inner edge of the sub-passage upstream portion 5 </ b> A of the sub-passage 5 and the outer edge of the base member 8. And the protruding item | line part 19 is protrudingly provided by the mating surface with the base member 8 of the housing member 10 so as to correspond to the shape of the adhesive application groove part 20.

  In the flow rate measuring apparatus 1 having the above configuration, the sensor element 17 is disposed in the sub-passage 5, and it is apparent that the shape and dimensional accuracy of the sub-passage 5 affect the measurement accuracy of the sensor element 17. As described above, the sub-passage 5 is formed by bonding two or more members (for example, the base member 8 and the housing member 10). In this case, due to the variation in the amount of the adhesive 12 applied, the sub-passage 5 There is a concern that the adhesive 12 protrudes into the (sub-passage upstream portion 5A) and the shape of the passage changes. A specific generation mechanism of variation in the amount of adhesive applied will be described below.

  In general, the adhesive application in the manufacturing process often uses an automatic adhesive applicator such as a dispenser. The automatic adhesive application device starts application along the adhesive application groove from a preset application start position of the adhesive application groove. The automatic adhesive applicator is used while controlling the application speed, the discharge pressure, etc. On the other hand, the amount of residual adhesive resulting from the previous application is not controlled. For this reason, the remaining adhesive causes a variation in coating at the start position of the main coating.

  Therefore, for example, in a state where the storage part 15 which is a characteristic component of the present invention is not provided, the amount of the remaining adhesive of the automatic adhesive coating device is large, and the amount of the adhesive 12 applied is excessive at the application start position. If the amount of the adhesive 12 is too small, the members are not bonded to each other, and in any case, the shape inside the sub-path 5 May vary. Therefore, the flow velocity distribution inside the sub-passage 5 may change, and stable flow rate measurement may be hindered.

  In order to solve such a problem, in the flow rate measuring apparatus 1 of the present invention, a storage part 15 capable of storing an adhesive is provided at a predetermined adhesive application start position. Here, the storage part 15 is a part where the gap between the adhesive application groove part 20 and the ridge part 19 is larger than other matching parts in the cross section perpendicular to the dispenser traveling direction, which is provided at the adhesive application start position. That is.

Below, a structure, an effect | action, and effect of the storage part 15 are demonstrated.
FIG. 4 is a view showing the storage part 15 and the application pattern in the base member 8. As shown by arrows in FIG. 4, the adhesive 12 is applied so as to move from the center of the spiral along the inner side of the sub-passage upstream portion 5A from the preset application start position P1, and further to the base member. It moves along the outer edge 8 and is applied to the application end position P2.

  FIG. 5 is a cross-sectional view illustrating the configuration of the reservoir in Example 1, and corresponds to the cross-section AA in FIG.

  The storage part 15 is provided at an application start position P1 set in advance as a position at which application of the adhesive 12 to the adhesive application groove 20 is started. The storage part 15 of Example 1 is formed by expanding a part of the adhesive application groove part 20 in the groove width direction, as shown in FIG. The storage part 15 has a larger groove width than the adhesive application groove part 20. It is desirable that the volume of the storage part 15 be equal to or greater than the upper limit of the residual adhesive amount.

  By adopting this shape and applying with an application pattern that stays in the storage part 15 until the dispenser assumes all of the excess adhesive that the dispenser assumes when applying adhesive, the amount of residual adhesive at the application start position is excessive or An excessive amount of adhesive can be prevented and an appropriate amount of adhesive can be applied to the adhesive application groove 20.

  Accordingly, it is possible to easily and inexpensively suppress the influence on the application due to the excessive or insufficient residual adhesive amount at the application start position due to the variation of the residual adhesive in the automatic adhesive application device such as a dispenser. Thereby, the shape of a subchannel | path can be manufactured stably, and the flow rate measuring apparatus which can perform the stable flow rate measurement by this can be provided.

[Example 2]
6 is a cross-sectional view illustrating the configuration of the reservoir in Example 2, and corresponds to the cross-section AA in FIG. What is characteristic in the present embodiment is that the storage part 15 is formed by deepening a part of the adhesive application groove part 20 in the groove depth direction. The storage part 15 has a structure in which a part of the adhesive application groove part 20 is deeper in the matching direction of the adhesive application groove part 20 at the application start position P1 preset at the same position as in the first embodiment. is doing.

  Accordingly, in the width direction of the adhesive application groove portion 20, for example, when measurement is performed in a required flow rate measurement range, there is a restriction that the sub-passage 5 requires a certain passage width or more. Even when the application groove portion 20 cannot be widened in the width direction, the reservoir portion 15 can be formed, and a desired effect can be obtained.

[Example 3]
FIG. 7 is a cross-sectional view illustrating the configuration of the reservoir in Example 3, and corresponds to the cross-section AA in FIG. What is characteristic in the present embodiment is that the reservoir portion 15 is formed by lowering a part of the ridge portion 19 in the protruding height direction. The reservoir 15 has a structure in which a part of the ridge 19 is made shallower (lower) in the direction in which the ridge 19 matches in the application start position P1 set in the same position as in the first embodiment. Have.

  Accordingly, in the width direction of the adhesive application groove portion 20, for example, when measurement is performed in a required flow rate measurement range, there is a restriction that the sub-passage 5 requires a certain passage width or more. Even when the application groove part 20 cannot be widened in the width direction, or when it is difficult to change the design of the member having the adhesive application groove part 20, the storage part 15 can be formed, and a desired effect can be obtained. Can be obtained.

[Example 4]
FIG. 8 is a cross-sectional view illustrating the configuration of the reservoir in Example 4, and corresponds to the cross section AA in FIG. What is characteristic in the present embodiment is that the storage part 15 is formed by the through hole 9 penetrating the base member 8 and having one end opened in the adhesive application groove part 20. The storage part 15 has a through hole 9 penetrating the base member 8 at the application start position P1 set in advance at the same position as in the first embodiment, and one end opens into the adhesive application groove part 20, The other end communicates with the outside.

  Thereby, in the width direction or the matching direction of the adhesive application groove portion 20, for example, when measuring in a required flow rate measurement range, there is a restriction that the sub passage 5 needs a certain passage width or more. When the adhesive application groove portion 20 cannot be widened in the width direction, and when the remaining adhesive amount of the dispenser is excessively larger than expected, the excess adhesive 12 is discharged from the through hole 9. Thus, a desired effect can be obtained.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, you may comprise the storage part 15 combining at least 2 or more of the above-mentioned each Examples 1-4. By adopting such a configuration, a larger volume can be secured, and even when the amount of the remaining adhesive in the dispenser is excessively larger than expected, a sufficient measure can be taken.

  According to the flow rate measuring device of the present invention, it is possible to suppress the sticking out of the adhesive 12 into the sub-passage 5 due to the remaining adhesive variation of the automatic adhesive applicator such as a dispenser, thereby realizing a stable flow rate measurement.

DESCRIPTION OF SYMBOLS 1 ... Flow measuring device 2 ... Main passage 3 ... Main pipe 4 ... Insertion hole 5 ... Sub passage 6 ... Connector terminal 7 ... Circuit board 8 ... Base member 9 ... Through-hole 10 ... Housing member 11 ... Cover member 12 ... Adhesive 13 ... Detour bypass 14 ... Connector 15 ... Storage agent 16 ... Suction air 17 ... Sensor element 18 ... Aluminum wire 19 ... Round strip 20 ... Adhesive application groove 31 ... Opening

Claims (6)

The sub-passage is combined with a sub-passage that is disposed in the main passage through which the fluid flows and takes in a part of the fluid flowing through the main passage, and a flow rate measuring element that is disposed in the sub-passage and measures the flow rate of the fluid. A flow rate measuring device comprising: a first member and a second member that form an adhesive; and an adhesive application groove that is recessed in a mating surface of the first member and to which an adhesive is applied.
A storage portion capable of storing the adhesive is provided at a predetermined adhesive application start position of the adhesive application groove as a position for starting application of the adhesive to the adhesive application groove. Flow rate measuring device.   The flow rate measuring device according to claim 1, wherein the storage part is formed by enlarging a part of the adhesive application groove part in the groove width direction.   The flow rate measuring device according to claim 1, wherein the storage part is formed by deepening a part of the adhesive application groove part in a groove depth direction.   The said storage part is formed by the through-hole which penetrates the said 1st member and an end opens to the said adhesive application groove part, The Claim 1 characterized by the above-mentioned. Flow measurement device. The second member has a ridge that is inserted into the adhesive application groove by being combined with the first member,
The flow rate measuring device according to any one of claims 1 to 4, wherein the storage part is formed by lowering a part of the protruding line part in a protruding height direction.   The flow rate measuring device according to any one of claims 1 to 5, wherein the storage part has a volume equal to or greater than an upper limit of a residual adhesive amount.

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