JP4352563B2 - Small pump - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a small pump, and more particularly to a small pump that is used in a blood pressure monitor and the like and uses a diaphragm.
[0002]
[Prior art]
A conventional small pump of this type will be described with reference to FIG. The figure shows a longitudinal sectional view of a small pump 1 cut around its axis by two vertical cut surfaces having an angle of 120 degrees, the small pump 1 forming pump chambers 3, 3, 3 in a case 2 The diaphragms 4, 4, 4 are provided, and the diaphragms 4, 4, 4 are integrally connected to each other to form a diaphragm assembly 5. A cylindrical exhaust valve body 6 is formed at the center of the diaphragm assembly 5, and the exhaust valve body 6 is pressed against an inner wall of the exhaust hole 8 opened at the center of the upper plate 7 of the case 2. Yes. Also, umbrella-type intake valve bodies 9, 9, 9 are attached to the upper plate 7 so as to be positioned above the diaphragms 4, 4, 4. The intake valve bodies 9, 9, 9 are formed with umbrella parts 9 a, 9 a, 9 a on the diaphragms 4, 4, 4 side, and pass through small holes 10, 10, 10 opened in the upper plate 7. Furthermore, fastening portions 9b, 9b, 9b larger in diameter than the small holes 10, 10, 10 are formed above the upper plate 7, whereby the intake valve bodies 9, 9, 9 are Crimped to the upper plate 7. In addition, several intake holes 11, 11,... Are formed in the vicinity of the periphery of the small holes 10, 10, 10, and the umbrella portions 9a, 9a, 9a of the intake valve bodies 9, 9, 9 are formed. The intake holes 11, 11 ... are sealed.
[0003]
Further, a swing plate 12 is swingably connected to lower ends of the diaphragms 4, 4, 4, and the swing plate 12 is configured to swing by a rotating eccentric shaft 13.
[0004]
Thus, when the eccentric shaft 13 rotates, the swing plate 12 swings, and the lower end portions of the diaphragms 4, 4 and 4 are moved up and down. When the lower end of the diaphragm 4 is moved downward by the swing plate 12, the inside of the diaphragm 4 becomes negative pressure, and the exhaust valve body 6 seals the exhaust hole 8, while the intake valve The umbrella portions 9a, 9a, 9a of the body 9 open the intake holes 11 from the sealed state to perform intake. Next, when the lower end of the diaphragm 4 is moved upward, the inside of the diaphragm 4 becomes high pressure, and the intake valve body 9 seals the intake holes 11, 11. 6 and the exhaust hole 8 are opened, and exhaust is performed.
[0005]
[Problems to be solved by the invention]
In the conventional small-sized pump, the lower end of the diaphragm moves up and down by the swing of the swing plate, and the intake valve body and the exhaust valve body operate in conjunction with the vertical movement of the diaphragm to perform intake and exhaust.
[0006]
However, since the intake valve body that operates in conjunction with the diaphragm is fixed to the upper plate of the case, and a part of the intake valve body is exposed to the outside of the upper plate, the intake valve body There was a problem that the operating sound of the body leaked outside the case, and the operating sound became noise.
[0007]
Therefore, in a small pump using a diaphragm, a technical problem to be solved in order to reduce noise generated from the intake valve body arises, and the present invention aims to solve this problem. .
[0008]
[Means for Solving the Problems]
The present invention has been proposed in order to achieve the above object, and includes a plurality of diaphragms forming a pump chamber in a case, and the diaphragm is moved up and down by a swinging plate swinged by an eccentric rotating shaft. In the small pump that performs the pump operation, a through hole is provided at the center of the bottom of the diaphragm, and an intake valve body that protrudes upward over the entire circumference is formed at the upper peripheral edge of the through hole. A connecting shaft that connects the diaphragm and the swing plate is inserted into the through hole and the intake valve body, and a vent portion that extends in the longitudinal direction from the lower end to the vicinity of the upper end is formed in the connecting shaft. The connection shaft and the intake valve body constitute an intake valve, and further, an exhaust hole is formed in a central portion of the case upper plate, and an outer periphery of the exhaust hole of the lower surface portion of the case upper plate is formed. A ring communicating with the exhaust hole The grooves form a plurality, there is provided a miniature pump that has an exhaust valve body is pressed against the exhaust valve formed by structure consisting of an upper end portion of the diaphragm to the inner wall surface forming the annular groove.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, one embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is a plan view of a small pump 21, in which 22 indicates a case, 23 is a diaphragm built in the case 22, and 24 is a swing that moves the lower end portion of the diaphragm 23 up and down. It is a moving plate.
[0010]
FIG. 2 shows a longitudinal sectional view of the small pump 21 taken along line AA. In FIG. 2, the small pump 21 is provided with three diaphragms 23, 23, 23 that form pump chambers 25, 25, 25 in a case 22, and the diaphragm 23, 23, 23 has the diaphragm below the diaphragm 23, 23, 23. An oscillating plate 24 that is connected to the connecting shaft 26 by the connecting shaft 26 and moves the lower end portions of the diaphragms 23, 23, 23 up and down is disposed. The rocking plate 24 is supported by an eccentric rotating shaft 27 and is rocked by the eccentric rotation of the eccentric rotating shaft 27. The eccentric rotary shaft 27 is eccentrically fixed to a rotating body 29 rotated by a rotary drive shaft 28.
[0011]
Further, a through hole 30 is provided at the center of the bottom of the diaphragm 23, and an intake valve body 31 protruding upward is provided at the upper peripheral edge of the through hole 30 over the entire circumference. The connecting shaft 26 is inserted into the through-hole 30 and the intake valve body 31, and the connecting shaft 26 is formed with a ventilation portion 26a cut out in the longitudinal direction from the lower end to the vicinity of the upper end. The connection shaft 26 having the ventilation portion 26a and the intake valve body 31 constitute an intake valve V1.
[0012]
In addition, an exhaust hole 32a is formed in the central portion of the upper plate 32 of the case 22, and three annular concave grooves communicated with the exhaust hole 32a on the outer periphery of the exhaust hole 32a on the lower surface portion of the upper plate 32. 33, 33, 33 are formed, and exhaust valve bodies 34, 34, 34 comprising upper ends of the diaphragms 23, 23, 23 are pressed against inner wall surfaces 33a forming the annular grooves 33, 33, 33. Thus, an exhaust valve V2 is configured.
[0013]
Thus, when the rotation drive shaft 28 rotates and the eccentric rotation shaft 27 rotates, the swing plate 24 swings, and the lower end portions of the diaphragms 23, 23, 23 are moved up and down. When the lower end of the diaphragm 23 is moved downward, the inside of the diaphragm 23 becomes negative pressure, and the exhaust valve body 34 is in close contact with the inner wall surface 33a of the annular groove 33, that is, the exhaust valve V2 is closed, and the intake valve body 31 has a diameter larger than that of the connecting shaft 26. That is, the intake valve V1 is opened and intake is performed. Next, when the lower end of the diaphragm 23 is moved up, the inside of the diaphragm 23 becomes high pressure, the intake valve body 31 contracts to close the intake valve V1, and the exhaust valve body 34 Exhaust by the exhaust valve V2 is performed with a diameter larger than the inner wall surface 33a. The exhaust state at this time will be described with reference to FIG. 3 (a cross-sectional view of the small pump 21 taken along line BB). The exhaust valve body 34 is expanded in diameter, and the air discharged from the exhaust valve body 34 is It passes through the annular groove 33 and is discharged out of the case 22 through the exhaust hole 32a.
[0014]
Thus, according to the present invention, the intake valve V1 is configured by the intake valve body 31 provided at the bottom of the diaphragm 23 and the connecting shaft 26 inserted into the intake valve body 31. As described above, the intake valve body 31 is not directly fixed to the case 22, and a part of the intake valve body 31 is not exposed to the outside of the case 22. Since the operation sound of the intake valve body 31 is silenced in the case 22 because it is completely stored in the case 22, noise leaking outside the case 22 is reduced.
[0015]
It should be noted that 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.
[0016]
【The invention's effect】
As described in detail in the above-described embodiment, the present invention provides a small pump having a plurality of diaphragms forming a pump chamber in a case. An intake valve body that protrudes upward over the entire circumference is formed at the upper peripheral edge of the hole, and the diaphragm and the swing plate are connected to the through-hole and the intake valve body, and the connection has a ventilation portion. Since the intake valve is formed by inserting the shaft and the connecting shaft and the intake valve body, the intake valve body is not directly fixed to the case as in the conventional example, and is also outside the case. Since it is not exposed, the operation sound of the intake valve body is silenced in the case, and noise leaking out of the case is reduced.
[0017]
Thus, the present invention is an invention that has a significant effect such as reducing noise generated from an intake valve of a small pump using a diaphragm.
[Brief description of the drawings]
FIG. 1 is a plan view of a small pump according to an embodiment of the present invention.
2 shows an embodiment of the present invention, and is a longitudinal sectional view of a small pump cut along line AA in FIG. 1. FIG.
3 shows an embodiment of the present invention and is a longitudinal sectional view of a small pump cut along line BB in FIG.
FIG. 4 is a longitudinal sectional view of a small pump showing a conventional example.
[Explanation of symbols]
21 Small pump 22 Case 23 Diaphragm 24 Oscillating plate 25 Pump chamber 26 Connecting shaft 26a Venting portion 27 Eccentric rotating shaft 30 Through hole 31 Intake valve body 32 Upper plate 32a Exhaust hole 33 Annular groove 33a Inner wall surface 34 Exhaust valve body V1 Intake Valve V2 Exhaust valve

Claims (1)

In a small pump having a plurality of diaphragms forming a pump chamber in a case, and the diaphragm is moved up and down by an oscillating plate that is oscillated by an eccentric rotation shaft, the pump is operated at the center of the bottom of the diaphragm. A through hole is provided, and an intake valve body that protrudes upward is formed on the upper peripheral edge of the through hole. Further, the diaphragm and the swing plate are disposed in the through hole and the intake valve body. A connecting shaft to be connected is inserted, and the connecting shaft is formed with a notch extending in the longitudinal direction from the lower end to the vicinity of the upper end, and the intake valve is configured by the connecting shaft and the intake valve body. Furthermore, an exhaust hole is opened in the central portion of the case upper plate, and a plurality of annular concave grooves communicating with the exhaust hole are formed on the outer periphery of the exhaust hole in the lower surface portion of the case upper plate. The inner wall surface forming the concave groove Miniature pump characterized in that the exhaust valve formed by an exhaust valve body consisting of an upper end portion of Yafuramu by pressure contact.

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