JP2001248564A - Compact pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce noise generated from a suction valve of a compact pump using a diaphragm. SOLUTION: In this compact pump 21 provided with a plurality of diaphragms 23, 23, 23 forming pump chambers 25, 25, 25 in a case 22 to perform the pump operation by moving the diaphragms 23, 23, 23 vertically by an oscillation plate 24, a through-hole 30 is provided in a central part of a bottom part of the diaphragm 23, a suction valve element 31 protruding upward over whole periphery is formed in an upper peripheral fringe part of the through-hole 30. The diaphragms 23 is connected with the oscillation plate 24 within the through-hole 30 and the inside of the suction valve element 31. A connection shaft 26 having a ventilation part 26a is inserted therein to constitute a suction valve V1 by the connection shaft 26 and the suction valve element 31. A plurality of annular grooves 33, 33, 33 communicated with an exhaust hole 32a are formed in a lower face part of an upper plate 32 of the case 22, and an exhaust valve element 34 formed by an upper end part of the diaphragm 23 is brought into pressure contact with an inner wall face 33a forming the annular grooves 33 to constitute an exhaust valve V2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small pump, and more particularly to a small pump used for a blood pressure monitor or the like and using a diaphragm.

[0002]

2. Description of the Related 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 about the axis by two vertical cutting planes having an angle of 120 degrees, and the small pump 1 has pump chambers 3, 3, 3 in a case 2.
3, three 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 6 is formed at the center of the diaphragm assembly 5, and the exhaust valve 6 is pressed against the inner wall of an exhaust hole 8 formed at the center of the upper plate 7 of the case 2. I have. In addition, umbrella-shaped intake valve bodies 9, 9, 9 are attached to the upper plate 7 above the diaphragms 4, 4, 4, respectively. The intake valve bodies 9, 9, 9 are provided with umbrella portions 9a, 9a, 9a on the side of the diaphragms 4, 4, 4, respectively.
The fastening holes 9b, 9b, 9b having a larger diameter than the small holes 10, 10, 10 are formed above the upper plate 7 through the small holes 10, 10, 10 formed in the hole. Thus, the intake valve bodies 9, 9, 9 are pressed against the upper plate 7. Are formed in the vicinity of the periphery of the small holes 10, 10, 10 so that the umbrella portions 9a, 9a, 9a of the intake valve bodies 9, 9, 9 are formed. The intake hole 1
Are sealed.

Further, a swinging plate 12 is swingably connected to lower ends of the diaphragms 4, 4, and 4, and the swinging plate 12 is configured to swing by a rotating eccentric shaft 13.

When the eccentric shaft 13 rotates, the swinging plate 12 swings and moves the lower ends of the diaphragms 4, 4, 4 up and down. When the lower end of the diaphragm 4 is moved down by the swing plate 12, the inside of the diaphragm 4 becomes a negative pressure, and the exhaust valve body 6 seals the exhaust hole 8, while the intake valve is closed. The umbrella portions 9a, 9a, 9a of the body 9 open the intake hole 11 from a closed state, and the intake is performed. Next, when the lower end of the diaphragm 4 is moved upward, the pressure inside the diaphragm 4 becomes high, and the intake valve body 9 closes the intake holes 11, 11,. 6 and the exhaust hole 8 are opened to exhaust air.

[0005]

In the above-mentioned conventional small 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 up and down movement of the diaphragm. And then exhausted.

However, 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 outside the upper plate. There is a problem in that the operation noise of the intake valve body leaks out of the case, and the operation noise becomes noise.

[0007] Therefore, in a small pump using a diaphragm, there arises a technical problem to be solved in order to reduce the noise generated from the intake valve body, and the present invention solves this problem. Aim.

[0008]

SUMMARY OF THE INVENTION The present invention has been proposed to achieve the above-mentioned object, and comprises a plurality of diaphragms forming a pump chamber in a case, wherein the swing is oscillated by an eccentric rotary shaft. In a small-sized pump in which the diaphragm is moved up and down by a plate to perform a pump operation, a through hole is provided in a center portion of a bottom portion of the diaphragm, and an intake air protruding upward over the entire periphery at an upper peripheral portion of the through hole. A valve body is formed, and a connecting shaft for connecting the diaphragm and the rocking plate is inserted into the through hole and the intake valve body, and the connecting shaft extends in a longitudinal direction from a lower end to a vicinity of an upper end. A cut-out ventilation portion is formed, an intake valve is constituted by the connection shaft and the intake valve body, and further, an exhaust hole is formed in a central portion of the case upper plate; The exhaust of the lower part of the upper plate A small pump having an exhaust valve formed by forming a plurality of annular grooves communicating with the exhaust hole on the outer periphery and pressing an exhaust valve body comprising the upper end of the diaphragm against an inner wall surface forming the annular groove. To provide.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below in detail with reference to FIGS. FIG. 1 is a plan view of a small pump 21, in which 22 denotes a case, and 23 denotes a case.
Is a diaphragm built in the case 22;
Reference numeral 4 denotes an oscillating plate for moving the lower end of the diaphragm 23 up and down.

FIG. 2 is a longitudinal sectional view of the small pump 21 taken along the line AA. Referring to FIG.
1 is provided with three diaphragms 23, 23, 23 forming pump chambers 25, 25, 25 in a case 22. Below the diaphragms 23, 23, 23, the diaphragms 23, 23, 23 and the connecting shaft are provided. An oscillating plate 24, which is connected by 26 and moves the lower ends of the diaphragms 23, 23, 23 up and down, is provided. The oscillating plate 24 is supported by an eccentric rotation shaft 27 and is oscillated by the eccentric rotation of the eccentric rotation shaft 27. The eccentric rotary shaft 27 is eccentrically fixed to a rotary body 29 rotated by a rotary drive shaft 28.

Further, a through hole 30 is provided at the center of the bottom of the diaphragm 23, and an intake valve body 31 is provided at an upper peripheral portion of the through hole 30 to protrude upward over the entire circumference. The connection shaft 26 is inserted into the through hole 30 and the intake valve body 31, and the connection shaft 26 has a ventilation portion 26 cut in the longitudinal direction from the lower end to the vicinity of the upper end.
The intake valve V1 is formed by the connection shaft 26 having the ventilation portion 26a and the intake valve body 31.

An exhaust hole 32a is formed in the center of the upper plate 32 of the case 22, and three exhaust holes 32a communicating with the exhaust hole 32a are formed on the outer periphery of the exhaust hole 32a on the lower surface of the upper plate 32. Annular concave grooves 33, 33, 33 are formed, and an exhaust valve body 3 composed of upper ends of the diaphragms 23, 23, 23 is provided on an inner wall surface 33a forming the annular concave grooves 33, 33, 33.
The exhaust valve V2 is formed by bringing the pressure valves 4, 34, 34 into pressure contact with each other.

When the rotation drive shaft 28 rotates and the eccentric rotation shaft 27 rotates, the swing plate 24 swings, and the lower ends 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 a negative pressure, and the exhaust valve body 34 comes into close contact with the inner wall surface 33a of the annular groove 33, that is, the exhaust valve V2 is closed, and the diameter of the intake valve body 31 is larger than that of the connection shaft 26, that is, the intake valve V1 is opened, and the intake is performed. Next, when the lower end portion of the diaphragm 23 is moved upward, the pressure in the diaphragm 23 becomes high, the intake valve body 31 contracts, the intake valve V1 is closed, and the exhaust valve body 34 is closed. Exhaust is performed by the exhaust valve V2 by expanding the diameter from the inner wall surface 33a. The state of exhaust 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 diameter of the exhaust valve body 34 is increased and the air discharged from the exhaust valve body 34 is The exhaust hole 3 passes through the annular groove 33.
2a is discharged out of the case 22.

Thus, the present invention relates to the diaphragm 23
Intake valve element 31 provided at the bottom of the intake valve element 31 and the intake valve element 31
The intake valve V1 is constituted by the connecting shaft 26 inserted therein, so that the intake valve body 31 is provided as in the conventional example.
Is not directly fixed to the case 22, nor is a part of the intake valve body 31 exposed to the outside of the case 22, and the intake valve body 31 is completely housed in the case 22. Therefore, the operation sound of the intake valve body 31 is
As a result, the noise that leaks out of the case 22 is reduced.

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]

As described in detail in the above embodiment, the present invention relates to a small pump having a plurality of diaphragms forming a pump chamber in a case, wherein a through hole is formed at the center of the bottom of the diaphragm. Along with the provision, an intake valve body projecting upward over the entire periphery is formed at an upper peripheral portion of the through hole, and the diaphragm and the swing plate are connected to the through hole and the intake valve body, and Insert a connecting shaft with a ventilation part,
Since the intake valve is constituted by 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 not exposed outside the case. The operation sound of the intake valve body is silenced in the case, and noise leaking out of the case is reduced.

As described above, the present invention is an invention having a very significant effect, such as reducing noise generated from an intake valve of a small-sized pump using a diaphragm.

[Brief description of the drawings]

FIG. 1 shows an embodiment of the present invention and is a plan view of a small pump.

FIG. 2 shows the embodiment of the present invention, and is a longitudinal sectional view of the small pump taken along line AA of FIG.

FIG. 3 is a longitudinal sectional view of the small pump taken along the line BB in FIG. 2, showing the embodiment of the present invention;

FIG. 4 is a longitudinal sectional view of a small pump, showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Small pump 22 Case 23 Diaphragm 24 Oscillating plate 25 Pump chamber 26 Connecting shaft 26a Vent part 27 Eccentric rotation shaft 30 Through hole 31 Intake valve body 32 Upper plate 32a Exhaust hole 33 Annular concave groove 33a Inner wall surface 34 Exhaust valve body V1 intake Valve V2 Exhaust valve

Claims (1)

[Claims] 1. A small pump comprising a plurality of diaphragms forming a pump chamber in a case, wherein the diaphragm is moved up and down by an oscillating plate oscillated by an eccentric rotation shaft to perform a pump operation. A through hole is provided in the center of the bottom of the intake valve, and an intake valve body projecting upward over the entire periphery is formed at an upper peripheral portion of the through hole, and further, the diaphragm and the diaphragm are provided in the through hole and the intake valve body. A connecting shaft for connecting the rocking plate is inserted therethrough, and the connecting shaft is formed with a cutout ventilation portion extending in a longitudinal direction from the lower end to the vicinity of the upper end, and the connecting shaft, the intake valve body and An exhaust valve is formed in the central portion of the upper case plate, and a plurality of annular grooves communicating with the exhaust holes are formed on the outer periphery of the exhaust hole on the lower surface portion of the case upper plate. Forming and forming the annular groove A small-sized pump comprising an exhaust valve formed by pressing an exhaust valve body comprising an upper end of the diaphragm against a wall surface.