JPH0717828Y2 - Small pump - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a small pump effective for use in a simple blood pressure monitor or the like.

[Conventional technology]

In recent years, a simple type sphygmomanometer that allows ordinary people to measure their own blood pressure has been sold, and a small and powerful motor-driven pump is used for such a sphygmomanometer.

[Problems to be solved by the invention]

However, the conventional one has a problem that the pump and the motor are separate bodies, and the motor and the diaphragm are separated from each other, so that the overall shape becomes large and it is difficult to configure the portable type. .

[Means for solving problems]

According to the present invention, an exhaust hole is provided at a central portion, a plurality of intake holes are provided in the circumferential direction to form a plurality of pump chambers in the circumferential direction, a tilted drive shaft is provided at a rotor of a motor, and each pump shaft is provided at the drive shaft. A driving body for driving each diaphragm of the chamber is provided.

[Action]

When the rotor rotates, the drive shaft rotates in a tilted state, so that the drive body makes a panning motion, and each diaphragm sequentially expands and contracts to perform a pump operation.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to the embodiments shown in the drawings.

FIG. 1 is a sectional front view showing an embodiment of a small pump according to the present invention, and FIG. 2 is a plan view thereof. The first
The drawing is a view taken along the line AA in FIG.

In these figures, 1 is a rotor body of a small direct current motor, 2 is a rotor core, 3 is a coil, 4 is a rotor shaft fixed to the rotor body 1, and 5 is inclined and fixed to the rotor body. Drive shaft, 6 is a commutator, 7 is an oil drain to prevent oil from being transmitted from the bearing to the commutator 6, 8 is a motor case, 9 is formed in the center of the motor case 8, and the rotor shaft 4 is rotated at two upper and lower positions. A bearing portion that freely supports, 10 is a thrust receiver, 11 is a brush, 12 is a lead terminal that supports the brush 11,
13 is a field magnet. The tip of the drive shaft 5 is arranged on the axis of the rotor shaft 4.

Reference numeral 14 is a disk-shaped driving member having three holes at 120-degree intervals, and 15 is a support portion extending in the center of the driving member 14 and integrally formed into a cylindrical shape, which is rotatably fitted on the driving shaft 5. , 16 are steel balls for reducing the friction between the drive shaft 5 and the drive body 14. When the rotor shaft 4 rotates, the drive shaft 5 rotates in a tilted state, so that the driving body 14 moves vertically up and down in the peripheral portion having a hole with respect to its center, and performs a so-called dish turning motion.

17 is formed in a cup shape, and three cylinders 18 are formed on the bottom surface (the upper surface in FIG. 1) at 120 degree intervals,
The opening side is a pump case that is screwed into the opening side of the motor case 8, and three screw holes are formed at an intermediate position of each cylinder 18.

20 is a substrate having three circular recesses 21 formed on the bottom surface at 120-degree intervals, 22 is a hole formed in the center of the recess 21, and 23 is a hole.
Five intake holes are formed around 22 respectively, 24 is a valve chamber formed upward in the center of the substrate 20, 25 is an exhaust hole formed in the valve chamber 24, and 26 is each recess 21. It is a hole formed three in order to pass the screw in the intermediate position of.

The substrate 20 has a common chamber 29 formed in the valve chamber portion 24, and each recess 21 has a notched groove 30 formed inward (in the direction of the center of the substrate) and connected to the common chamber 29. Figure 3 shows the substrate
It is a bottom view of 20.

31 is an umbrella-shaped valve body made of soft and thin rubber, 32 is a valve body 31
The support column is integrally formed by extending upward at the center of the support column, and 33 is a thicker head formed at the tip of the support column 32. The valve body 31 is formed with a diameter large enough to cover the intake hole 23, and is mounted so that the support column 32 penetrates the hole 22 and the head 33 is exposed to the outside and does not come out to the substrate 20. ing.

34 is a disk-shaped diaphragm body made of soft and thin rubber, 35 is a bell-shaped three diaphragm parts integrally formed by extending downward from the body at 120 degree intervals, 36
Is a piston part in the center of the piston part, 37 is a head part formed at the tip of the piston part 36 through a thin neck part, and 38 is a cylindrical valve body part integrally formed by extending upward from the central part of the main body. is there.
The head portion 37 penetrates the hole of the driving body 14 and projects to the lower surface side thereof, whereby the piston 36 portion is held by the driving body 14.

The substrate 20 is attached to the pump case 17 with the diaphragm body 34 sandwiched therebetween, and a screw (not shown) is passed through the hole 26 of the substrate 20 and screwed into the screw hole of the pump case 17 to assemble the pump portion.

The recess 21 of the substrate 20 and the diaphragm portion 35 form three pump chambers 39, and the valve body portion 38 is in contact with the inner peripheral surface of the valve chamber portion 24, and is common to the pump chamber 39. It is designed to block the communication passage with 29.

The concave portion 21 of the substrate 20 is unnecessary if the piston portion 36 does not come into contact with the valve body 31 when the piston portion 36 rises (when contracted), and the bottom surface of the substrate 20 may be flat.

In this structure, when a power source is connected to the lead terminal 12, current flows through the brush 11, the commutator 6 and the coil 3,
The rotor shaft 4 supported by the bearing 9 rotates. As a result, the drive shaft 5 also rotates and the drive body 14 makes a dish-turning motion, and each piston portion 36 vibrates vertically with a phase difference of 120 degrees.
This piston movement causes the volume of the pump chamber 39 to change periodically. When the piston 36 moves downward and the volume increases,
The pump chamber 39 is decompressed, the valve body portion 38 is in close contact with the valve chamber portion 24, and the valve body 31 is opened, and air flows in from the intake hole 23. Next, when the piston portion 36 moves upward and the volume decreases, the pressure in the pump chamber 39 is increased and the valve body 31 is brought into close contact with the substrate 20 to be closed. On the contrary, the valve body portion 38 is closed in the pump chamber 39. The part that closes the groove 30 is opened, and the air in the pump chamber 39 passes through the common chamber 29 and is discharged from the exhaust hole 25.

In such a small pump, since the rotor is integrally provided with the drive shaft, the motor and the pump become one,
The size is small.

FIG. 4 is a sectional front view of a main part of another embodiment. 1a is a rotor body, 2a is a rotor core, 3a is a coil, 4a is a rotor shaft fixed to a motor case 8a, 6a is a commutator fixed to the rotor body 1a together with an oil drainer 7a, 10a is a thrust receiving ball, and 11a is a brush. , 12a are lead terminals, and 13a is a magnet.
The rotor body 1a also serves as a bearing portion and is rotatably supported by the rotor shaft 4a. The other structure is exactly the same as that of the embodiment shown in FIG.

FIG. 5 is a sectional front view of a main part of another embodiment. 1b is rotor body, 2b is rotor core, 3b is coil, 4b is rotor body
Rotor shaft fixed to 1b, 6b commutator, 7b oil remover, 8b
Is a motor case, 10b is a thrust receiver, 11b is a brush, 12b is a lead terminal, 13b is a magnet, 40 is a motor case lid, 41 is a cylindrical yoke, and 42 is a collar connecting the rotor shaft 4b and the drive shaft 5. is there. The rotor shaft 4b is rotatably supported by the bearings of the motor case 8b and the motor case lid 40.

[Effect of device]

As described above, according to the small pump of the present invention, by integrating the motor and the pump, the overall length is shortened and the shape is downsized and lightened, and the number of parts is significantly reduced and the cost is reduced. Has the effect of being reduced.

[Brief description of drawings]

FIG. 1 is a sectional front view of an embodiment of a small pump according to the present invention, FIG. 2 is a plan view, FIG. 3 is a bottom view of a substrate, and FIG. 4 is a sectional front view of essential parts of another embodiment, FIG. 5 is a sectional front view of a main part of another embodiment. 1 ... Rotor body, 2 ... Rotor core, 3 ... Coil,
4 ... Rotor shaft, 5 ... Drive shaft, 13 ... Magnet, 14 ... Drive body, 23 ... Intake hole, 25 ... Exhaust hole, 31 ... Valve body, 35 ...
… Diaphragm, 36 …… Piston, 39 …… Pump chamber.

Claims (1)

[Scope of utility model registration request] 1. A disk-shaped substrate having an exhaust hole in the center thereof and having intake holes formed at a plurality of positions at substantially equal angular intervals around the exhaust hole, and arranged below each intake hole of the substrate. A plurality of pump chambers each formed by a diaphragm, a plurality of grooves that individually connect the pump chambers and the exhaust holes, and a circular shape formed by an elastic body provided in the exhaust holes so as to close the grooves. A first valve body, a second valve body provided in each pump chamber on the lower surface of the substrate so as to open and close an intake hole, and a driving body that sequentially drives each diaphragm constituting each pump chamber up and down. A small pump, comprising: a motor having an output shaft connected to the driving body for driving the driving body, wherein the output shaft is obliquely attached to a rotor of the motor.