JP4793427B2 - Assembly method of micro air pump - Google Patents

Description

  The present invention relates to a method for assembling a micro air pump, and in particular, even if a pulley is miniaturized as a pump part driving part of a micro air pump applied to a small blood pressure monitor or the like, the pulley is used as a motor shaft. The present invention relates to a method of assembling a micro air pump that can be firmly mounted at a predetermined mounting angle and can minimize loss of pressure in the pump chamber.

  Examples of conventional air pumps include those shown in FIGS. 4 and 5. 4 is a front view, and FIG. 5 is a perspective view of a portion below the lower pump case shown by the line XX in FIG. In these drawings, the air pump 1 includes a pump unit 3 in a pump case 2 made of a transparent resin material having a rectangular shape in plan view. The pump case 2 is composed of a housing-like upper pump case 2A and a lower pump case 2B, and the upper pump case 2A of the upper pump case 2A is formed on locking protrusions 4a and 4b formed on both side surfaces of the lower pump case 2B. Locking openings 5a and 5b formed in extending portions extending from both sides are fitted and locked, and the upper and lower pump cases 2A and 2B are integrated to constitute the pump case 2. The main part of the pump unit 3 is provided in the upper pump case 2A. The pump unit 3 includes a diaphragm (not shown) that forms a pump chamber, and an air suction / exhaust operation by moving the lower surface of the diaphragm up and down. An oscillating body (not shown) that performs the above is provided. An exhaust hole (output hole) 6 for discharging the air discharged from the pump chamber to the outside of the pump case 2 as a pump output is provided at the center of the upper surface of the upper pump case 2A.

  A motor 7 for driving the pump unit is attached to the lower surface of the lower pump case 2B by screws 8 and 8 stops. A motor shaft 9 of the motor 7 is projected into the lower pump case 2B, and a resin pulley (rotary body) 10 which is one of pump unit driving parts is provided at the front end of the motor shaft 9 as the pulley. The tip is fixed in such a manner that the tip is press-fitted into the hole 10a. A recess 10b is formed on the upper surface of the pulley 10 at a position away from the pulley center position, and the lower end of the eccentric rotation shaft 11 is loosely fitted into the recess 10b. The upper end of the eccentric rotation shaft 11 is on the pump unit 3 side. It is loosely fitted. The oscillating body is fixed to the upper part of the eccentric rotating shaft 11, and when the pulley 10 is rotated by the rotation of the motor shaft 9, the eccentric rotating shaft 11 is eccentrically rotated, whereby the oscillating body is oscillated and the diaphragm is rotated. The lower surface of the plate moves up and down to perform air suction and exhaust operations.

For example, the following gear pump is known as a conventional technique in which a driving motor is integrally attached to the pump unit. In this prior art, [0007] to [0008] and [0024] in the publication in which the prior art is disclosed, a shaft coupling for connecting a rotating shaft of a motor and a drive shaft of a pump portion, and a pump portion as a motor. In the gear pump which pressurizes the water sucked from the water supply port of the pump part and sends it out from the water supply port, the shaft center is coaxial with the shaft center of the rotation shaft And a drive shaft guide portion whose axis is coaxial with the axis of the drive shaft is projected on the surface on the mounting member side of the pump portion, and the rotary shaft guide portion and the shaft coupling And a guide member into which the shaft coupling is inserted and the rotating shaft guide portion and the drive shaft guide portion are fitted to both ends so that the respective shaft centers of the drive shaft guide portion are coaxially positioned Are provided separately. And since the guide member is separated and independent from the mounting member and is not affected by the outer peripheral portion of the mounting member at the time of component manufacture, it is described that the coaxiality between the rotating shaft and the drive shaft can be secured ( For example, see Patent Document 1).
JP 2000-161247 A.

  In the conventional air pump described in FIG. 4 and FIG. 5, the front end of the motor shaft has a resin pulley, which is one of the pump drive parts, and the front end is press-fitted into the pulley hole. It is fixed. When the motor shaft is press-fitted into a pulley hole in a resin pulley, it is important to push the motor shaft so as to exactly match the direction of the pulley hole. When the motor shaft is pushed into the pulley hole in an oblique direction, it is a method of press-fitting and fixing using the deformation of the resin. Pressure loss occurs. However, since the air pump applied to a small blood pressure monitor is miniaturized, a pulley having a small shape and size is used. For this reason, it is extremely difficult to push the motor shaft so as to exactly match the direction of the pulley hole.

  Moreover, in the prior art described in Patent Document 1, it is a technique for ensuring the coaxiality of the rotating shaft of the motor and the drive shaft of the pump unit, and the pump unit pressurizes the sucked water and sends it out from the water supply port. It is. For this reason, the shaft diameter of the rotating shaft of the motor is considerably larger than the shaft diameter of the motor shaft in the motor for driving the air pump. This is completely different from the technique of press-fitting into a pulley hole in a resin pulley.

  Therefore, even if the pulley is miniaturized as a pump part for a micro air pump, the pulley is securely attached to the motor shaft with high accuracy at a predetermined mounting angle, minimizing the pump chamber pressure loss and miniaturizing. In addition, the guide part of a simple structure adapted to each part and a guide part made up of guide ribs used only during assembly are housed on the inner wall side of the pump case, and the micro air pump as a product is applied to a small sphygmomanometer, etc. The technical problem to be solved in order to push the motor shaft more reliably in the direction of the pulley hole by guiding the outer wall of the pump case with the case guide surface without causing any troubles The present invention aims to solve this problem.

  The present invention has been proposed in order to achieve the above object, and the invention according to claim 1 is characterized in that a motor for driving the pump unit is attached to the lower surface of a housing-like pump case in which the pump unit is housed. A structure in which a motor shaft in a motor protrudes into the pump case, and a resin pulley, which is a pump drive component, is fixed to the tip of the motor shaft in such a manner that the tip is press-fitted into the pulley hole. A micro air pump assembly method comprising: a pulley receiving jig for positioning and holding the pulley when the front end of the motor shaft is press-fitted into the pulley hole of the pulley; A guide portion that follows the outer peripheral surface of the jig base of the pulley receiving jig is provided, and when the front end of the motor shaft is press-fitted into the pulley hole in the pulley, the jig is fixed. It provides a method of assembling a micro air pump to advance by the forward end portion of the motor shaft to the pulley hole by guiding the guide portions at the outer peripheral surface of the platform.

  According to this configuration, the motor shaft of the motor attached to the lower surface of the pump case is pushed in exactly in the hole direction of the pulley hole. This suppresses pressure dispersion when the motor shaft is pressed into the pulley hole, and the pulley is firmly fixed to the motor shaft at a predetermined mounting angle.

  According to a second aspect of the present invention, in the first aspect of the invention, the jig base is a cylindrical body, and the guide portion that follows the outer peripheral surface of the cylindrical body is a plurality of guide ribs. I will provide a.

  According to this configuration, the guide portion, specifically, a plurality of guide ribs, can be pushed into the jig base made of a cylindrical body so that the motor shaft is accurately aligned with the hole direction of the pulley hole. It becomes possible. The plurality of guide ribs used only at the time of assembly do not appear on the outer surface of the micro air pump as a product but are accommodated on the inner wall side of the pump case.

  The invention according to claim 3 is the invention according to claim 2, wherein the number of the ribs of the guide rib is four, and the four guide ribs are arranged at substantially equal intervals with respect to the outer periphery of the cylindrical body. A method for assembling an air pump is provided.

  According to this configuration, the guide ribs are four strips arranged at substantially equal intervals on the outer periphery of the cylindrical body, so that when the front end portion of the motor shaft is press-fitted into the pulley hole by the guide portion with a simple configuration, the motor It becomes possible to push the shaft in exactly the direction of the pulley hole.

  According to a fourth aspect of the present invention, in the first, second, or third aspect of the present invention, the case receiving jig that receives the pump case when the front end portion of the motor shaft is press-fitted into the pulley hole of the pulley, A method for assembling a micro air pump having a case guide surface for guiding a side wall of a case is provided.

  According to this configuration, when the front end portion of the motor shaft is press-fitted into the pulley hole, the guide portion that follows the outer peripheral surface of the jig base and the case guide surface that guides the side wall of the pump case cooperate with each other in the pump case. By guiding the protruding motor shaft, the motor shaft is pushed in more reliably in the direction of the pulley hole.

  Even if the pulley is miniaturized as the pump part drive part of the micro air pump, the invention according to claim 1 does not require more precision than necessary for the molding dimensions of the pump case itself, which is a resin molded product, Since the motor shaft is pushed in precisely in accordance with the hole direction of the pulley hole, the pulley can be firmly attached to the motor shaft with a predetermined attachment angle with high accuracy. Further, the pulley has a function of swinging the swinging body on the lower surface of the diaphragm forming the pump chamber via the eccentric rotation shaft. In such a function, as described above, the pulley is firmly attached to the motor shaft with high accuracy at a predetermined attachment angle, so that the pump chamber pressurization loss during driving of the pump unit can be minimized. There are advantages.

  Specifically, the motor shaft can be pushed in precisely by aligning with the hole direction of the pulley hole by the guide portion constituted by a plurality of guide ribs. Further, since the plurality of guide ribs used only at the time of assembly are housed on the inner wall side of the pump case and do not appear on the outer surface of the micro air pump as a product, the micro air pump is a small blood pressure monitor. There is an advantage that it does not cause any trouble when applied to the above.

  The invention described in claim 3 is advantageous in that the motor shaft can be pushed in precisely in the direction of the pulley hole by the guide portion having a simple structure composed of four guide ribs adapted to each of the miniaturized parts. There is.

  The invention according to claim 4 has an advantage that the motor shaft can be pushed in more reliably in the hole direction of the pulley hole by guiding the side wall of the pump case with the case guide surface.

  Even if the pulley is miniaturized as a pump part drive part of the micro air pump, the pulley is securely attached to the motor shaft with high accuracy at a predetermined mounting angle to minimize the pressure loss of the pump chamber, and each miniaturized In the case of applying a micro air pump as a product to a small sphygmomanometer etc. with a guide part consisting of guide ribs used only during assembly as a guide part with a simple configuration adapted to the parts and housed on the inner wall side of the pump case In order to achieve the purpose of pushing the motor shaft more securely in the direction of the pulley hole by guiding the outer wall of the pump case with the case guide surface without causing any trouble, A motor for driving the pump unit is attached to the lower surface of a housing-like pump case in which the motor is mounted, and a motor shaft in the motor A micro air pump that protrudes into the pump case and has a structure in which a resin pulley, which is a pump part drive component, is fixed to the front end of the motor shaft in such a manner that the front end is press-fitted into the pulley hole. A pulley receiving jig for positioning and holding the pulley when the front end portion of the motor shaft is press-fitted into the pulley hole of the pulley, and an inner wall of the pump case is provided with the pulley receiving jig. A guide portion that follows the outer peripheral surface of the jig base is provided, and the guide portion is guided by the outer peripheral surface of the jig base when the front end portion of the motor shaft is press-fitted into the pulley hole of the pulley. This was realized by advancing the front end portion so as to coincide with the pulley hole.

  Hereinafter, a method for assembling a micro air pump according to an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a perspective view showing a lower pump case portion provided with a guide portion applied to the present embodiment and a motor attached to the lower surface of the lower pump case portion, and FIG. 2 is applied to the present embodiment. FIG. 3 is a perspective view showing the assembly jig, FIG. 3 is a view showing a portion of the pulley receiving jig in the assembly jig, (a) is a side view showing the dish-like recess portion holding the pulley, and (b). These are top views for demonstrating the guide effect | action of the guide part by the outer peripheral surface of a jig stand. In FIG. 1 to FIG. 3, the same or equivalent members and parts in FIG. 4 and FIG. First, the structure of the assembly jig applied to the present embodiment will be described with reference to FIG.

  In FIG. 2, the assembly jig 12 has a pulley receiving jig 14 erected on a fixed base 13, and a case receiving jig 15 is vertically moved on a portion of a jig base 14 a made of a cylindrical body in the pulley receiving jig 14. It is loosely inserted so that it can move. A coil spring 16 is provided between the lower surface of the case receiving jig 15 and the upper surface of the fixed base 13 at the jig base 14 a portion below the case receiving jig 15. As shown in FIG. 3A, the pulley receiving jig 14 is formed with a dish-shaped recess 14 b, and when the tip of the motor shaft 9 is press-fitted into the pulley hole 10 a of the pulley 10, the dish-shaped recess 14 b is formed. The recess 14b has a function of positioning and holding the pulley 10.

  Further, the upper portion of the case receiving jig 15 is recessed to a size corresponding to the lower pump case 2B. Similarly, when the tip end of the motor shaft 9 is press-fitted into the pulley hole 10a of the pulley 10, the recessed portion is provided. It has the function which receives lower pump case 2B in the part which was made. A rotation restricting member (not shown) for restricting the case receiving jig 15 from rotating around the jig base 14 a is provided on the fixed base 13. Therefore, the case receiving jig 15 that is loosely inserted into the jig base 14a can move up and down the portion of the jig base 14a in a state where the rotation is restricted.

  In the present embodiment, the assembly jig 12 configured as described above follows the outer peripheral surface of the jig base 14a of the pulley receiving jig 14 on the inner wall of the lower pump case 2B as shown in FIG. Four guide ribs 17 are provided as guide portions. As shown in FIG. 3 (b), the four guide ribs 17 are arranged at substantially equal intervals with respect to the outer periphery of the jig base 14a. Further, a case guide surface 15a for guiding the side wall of the lower pump case 2B is provided on the side wall of the recessed portion above the case receiving jig 15 for receiving the lower pump case 2B.

  Next, a method for press-fitting the motor shaft into the pulley hole of the pulley using the assembly jig configured as described above will be described. As shown in FIG. 2, first, the pulley 10 is positioned by being held in the dish-like recess 14 b in the pulley receiving jig 14. Then, the lower pump case 2B, to which the motor 7 is integrally attached, faces downward so that the tip of the motor shaft 9 faces the pulley hole 10a, and is pushed into the recessed portion above the case receiving jig 15, The case receiving jig 15 is moved downward against the elastic force of the coil spring 16.

  At this time, as shown in FIG. 3 (b), the guide portion composed of the four guide ribs 17 is guided on the outer peripheral surface of the jig base 14a, and at the same time, the lower side is lowered on the case guide surface 15a of the case receiving jig 15. The side wall of the pump case 2B is guided. By the cooperation of both the guide portions 17 and 15a, the motor shaft 9 is surely aligned with the hole direction of the pulley hole 10a, and pressure dispersion at the time of press-fitting is suppressed, so that the motor shaft 9 is press-fitted into the pulley hole 10a. . As a result, the pulley 10 is firmly fixed to the front end portion of the motor shaft 9 at a predetermined mounting angle.

  As described above, in the method of assembling the micro air pump according to the present embodiment, even if the pulley 10 is miniaturized as a pump part driving part of the micro air pump, the motor shaft 9 is accurately in the hole direction of the pulley hole 10a. By being pushed in conformity, the pulley 10 can be firmly attached to the motor shaft 9 with a predetermined attachment angle with high accuracy. As a result, the pump chamber pressurization loss when the pump unit is driven can be minimized.

  The four guide ribs 17 used only for assembly are accommodated on the inner wall side of the lower pump case 2B and do not appear on the outer surface of the micro air pump as a product. When applied to a sphygmomanometer or the like, no trouble is caused.

  Since the case guide surface 15a also guides the side wall of the lower pump case 2B, the motor shaft 9 can be pushed into the hole direction of the pulley hole 10a more reliably, and the pulley can be pushed into the motor shaft 9. 10 can be firmly attached at a predetermined attachment angle with higher accuracy.

  The present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

The perspective view which shows the motor attached to the lower surface of the lower pump case part provided with the guide part applied to the assembly method of the micro air pump which concerns on the Example of this invention, and this lower side pump case part. The perspective view which shows the assembly jig applied to the Example of this invention. It is a figure which shows the part of the pulley receiving jig in the assembly jig | tool of FIG. 2, (a) is a side view which fractures | ruptures the dish-shaped recessed part holding a pulley, (b) is based on the outer peripheral surface of a jig stand. The top view for demonstrating the guide effect | action of a guide part. The front view of the conventional air pump. The perspective view of the part below the lower side pump case shown by the XX line in FIG.

Explanation of symbols

1 Air pump 2 Pump case 2A Upper pump case 2B Lower pump case
3 Pump part 4a, 4b Locking protrusion 5a, 5b Locking opening 6 Exhaust hole (output hole)
7 Motor 8 Screw 9 Motor shaft 10 Pulley 10a Pulley hole 11 Eccentric rotating shaft 12 Assembly jig 13 Fixing base 14 Pulley receiving jig 14a Jig base 14b Dish-shaped recess 15 Case receiving jig 15a Case guide surface 16 Coil spring 17 Guide rib (Guide part)

Claims (4)

A motor for driving the pump unit is attached to the lower surface of a housing-like pump case in which the pump unit is built, and the motor shaft of the motor protrudes into the pump case, and at the tip of the motor shaft, the pump unit driving component A resin air pulley is a method of assembling a micro air pump having a structure in which the front end portion is fixedly inserted into the pulley hole,
When the front end of the motor shaft is press-fitted into the pulley hole of the pulley, a pulley receiving jig for positioning and holding the pulley is provided, and the inner wall of the pump case is provided on the outer peripheral surface of the jig base of the pulley receiving jig. A guide portion for copying is provided, and when the front end portion of the motor shaft is press-fitted into the pulley hole in the pulley, the front end portion of the motor shaft is guided to the pulley hole by guiding the guide portion with the outer peripheral surface of the jig base. A method of assembling a micro air pump, characterized in that the micro air pump is moved forward by matching.   2. The method of assembling a micro air pump according to claim 1, wherein the jig base is a cylindrical body, and the guide portion following the outer peripheral surface of the cylindrical body is a plurality of guide ribs.   3. The method of assembling a micro air pump according to claim 2, wherein the number of the guide ribs is four, and the four guide ribs are arranged at substantially equal intervals with respect to the outer periphery of the cylindrical body.   2. A case guide surface for guiding a side wall of the pump case is provided on a case receiving jig for receiving the pump case when the front end portion of the motor shaft is press-fitted into a pulley hole of the pulley. A method of assembling a micro air pump according to claim 2, 2 or 3.

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