JPH02214465A - Linear stepping motor - Google Patents

Abstract

PURPOSE:To enhance the thrust of a rod by interposing a plurality of balls rotatably between a spiral rotor nut side ball groove formed on the inner peripheral surface of a rotor nut and a spiral rod side ball groove formed in the same direction as the rotor nut side groove on the outer peripheral surface of the rod. CONSTITUTION:A cylindrical rotor nut 23c is mounted concentrically and integrally in a magnet 23b, the nut 23c is rotatably installed by bearings 23e, and a valve body supporting rod 23d is telescopically inserted into the nut 23c. A spiral rotor nut side ball groove 23k is formed on the inner peripheral surface of the nut 23c. On the other hand, a spiral rod side ball groove 23m is formed in the same direction as the groove 23k on the outer peripheral surface of the rod 23d. Further, a plurality of balls 23n are interposed rotatably between the opposed grooves 23k and 23m.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a linear stepping motor.

(b) Conventional technology Conventionally, as a form of linear stepping motor, a cylindrical magnet is arranged concentrically within a cylindrical coil, and the magnet can be rotated by exciting the coil. A rotor nut with a female thread formed on the inner circumferential surface is installed concentrically and integrally within the magnet.
There is a rotor nut in which a rod having a male thread on its outer circumferential surface is screwed onto the female thread of the rotor nut so that the rod moves forward and backward in conjunction with the rotor nut which rotates integrally with the magnet.

(c) In the case of the above-mentioned linear stepping motor, the problem to be solved by the invention is
The efficiency of converting the rotational torque of the rod into linear operation is low,
The problem was that the rotation of the rod was uneven, making it impossible to obtain high thrust.

As a result, there are problems in that resolution is unstable, reliability is low, and power consumption is high.

On the other hand, since high thrust cannot be obtained, there is a problem in that if you try to obtain large thrust, the motor itself has to be large.

(d) Means for Solving the Problem Therefore, in the present invention, a cylindrical magnet is arranged concentrically within a cylindrical coil, and the magnet can be rotated by exciting the coil. A cylindrical rotor nut with a spiral rotor nut side ball groove on the inner peripheral surface is installed concentrically and integrally within the magnet, and a cylindrical rotor nut with a spiral rotor nut side ball groove on the outer peripheral surface in the same direction as the rotor nut is installed inside the rotor nut. A rod having a ball groove on the rod side is inserted so as to be able to move forward and backward, and a plurality of balls are rotatably interposed between the opposing ball groove on the rotor nut side and the ball groove on the rod side to rotate together with the magnet. It is an object of the present invention to provide a linear stepping motor which is capable of moving a rod steplessly forward and backward over a minute distance in conjunction with a rotary nut.

(e) Embodiment An embodiment of the present invention will be described in detail based on the drawings. (Ml) shown in FIG. 1 is a linear stepping motor according to the present invention.

In other words, the above linear stepping motor (old) is
A cylindrical coil (23) is placed inside the motor casing (23).
a), a cylindrical magnet (23b) is arranged in the same fill (23a), and by exciting the same coil (23a), the magnet (23b) can be rotated in forward and reverse directions. ) has a cylindrical rotor nut (
23c) are mounted concentrically and integrally, the rotor nut (23c) is rotatably supported by a bearing (23e), and the valve body support rod (23d) is slidably moved forward and backward in the rotor nut (23c). It is inserted.

A spiral rotor nut side ball groove (23k) is formed on the inner circumferential surface of the rotor nut (23c), while a spiral rotor nut side ball groove (23k) is formed on the outer circumferential surface of the valve body support rod (23d) in the same direction as the rotor nut side ball groove (23k). A spiral rod side ball groove (23m) is formed, and a plurality of balls (23n) are rotatably interposed between the opposing rotor nut side ball groove (23k) and rod side ball groove (23■). ing.

(23g) is a rotation regulating piece that prevents the valve body support rod (23d) from rotating with the rotor nut (23c).

With this configuration, the valve body support rod (23d) can be moved forward and backward steplessly over a minute distance via the ball (23n) in conjunction with the rotor nut (23b) that rotates integrally with the magnet (23c). There is.

In addition, Fig. 2 shows the relationship between the efficiency of converting the rotary torque of the rotor nut (23b) into linear motion of the valve body support rod (23d) and the lead angle in the linear stepping motor (old). Conversion efficiency curve in the figure (
As shown in a), the conversion efficiency can be reduced to about 85 with a small lead angle.
It can be seen that it is possible to achieve a high efficiency of %. (b) is a conversion efficiency curve of a conventional lead screw, and comparing the conversion efficiency curve (b) with the above conversion efficiency curve (a), it is found that the conversion efficiency of the linear stepping motor (Ml) according to the present invention is very high. I know it's expensive.

Further, FIG. 3 shows a jet nozzle (2) equipped with a linear stepping motor (Ml) according to the present invention, and the jet nozzle (2) is connected to the bubble generating bathtub shown in FIGS. 6 and 7. It is attached to the bathtub body (1) of (^) and configured to be able to automatically change the amount and pressure of the bath water jetted into the bathtub body (1).

Hereinafter, the configuration of the jet nozzle (2) will be explained based on FIGS. 3 to 5.

That is, the jet nozzle (2) is connected to the jet nozzle connection port (Ig) of the bathtub body (1) with a cylindrical nozzle casing (2).
0) is connected in a cantilevered manner to the outside of the bathtub body (1), and in the same nozzle casing (20) there is a jet flow forming part (50) that spouts out a bath mixed with air bubbles, and a jet flow forming part ( 5
A throat part (60) that determines the direction of the ejection of the bath mixed with air bubbles ejected from the bathtub body (1) is arranged and fixed via a decorative cover (26) located on the side of the bathtub body (1).

Below, the components of the jet nozzle (2), such as the nozzle casing (20), the decorative cover (2B), and the throat part (60
) and the jet flow forming section (50) will be explained individually.

As shown in FIG. 3, the nozzle casing (20) has its front end connected in communication with the circular foot-side jet nozzle connection port (Ig) opened at the lower part of the front wall of the bathtub body (1,), and its rear end It extends backwards almost horizontally.

Then, a ring-shaped gasket (lh) is fitted around the periphery of the jet nozzle connection port (Ig), and a female thread is formed on the inner peripheral surface of the front surface of the gasket (lh) located inside the bathtub body (1). Attach the rear surface of the ring-shaped female threaded part (11), and attach the nozzle casing (20) to the ring-shaped female threaded part (11).
The nozzle casing (20) is attached to the front wall of the bathtub body (1) in a substantially orthogonal state and in a watertight state by removably screwing the outer peripheral male threaded part (20a) formed on the outer peripheral surface of the front end of the nozzle casing (20). There is.

In addition, the decorative cover (2B) has a cylindrical overall shape, a female threaded portion (28a) is formed on the outer peripheral surface, and a problematic threaded portion (26
a) is removably screwed onto the inner circumferential male threaded portion (20j) formed on the inner circumferential surface of the front end of the nozzle casing (20), and the front end (28b) of the decorative cover (2G) is placed in the inner and outer overlapping state. Along the front end of the nozzle casing (20) and the front end of the ring-shaped female threaded part (If), the ring-shaped female threaded part (11) is extended in a folded manner to the outer peripheral surface of the ring-shaped female threaded part (11). 28b) covers the front end of the nozzle casing (20) and the ring-shaped female threaded portion (11), and the throat fixing member (25), which will be described later, is attached to the rear end of the decorative cover (26).
) is fixed.

Further, as shown in FIGS. 4 and 5, an intake vibe connecting portion (20) is provided on the central peripheral wall of the nozzle casing (20)
b) is opened, and the other end of the intake vibrator (12), one end of which is connected to the air intake part (5) (see Fig. 6), is removably connected to the connection part (2 (lb)). ing.

In addition, a third
As shown in FIG. 4 and FIG.
) is removably connected to a bath water forced vibrator (11) (see Fig. 6). (n) indicates the bath water inflow direction.

Further, the throat portion (BO) is composed of a throat (24), a throat fixing member (25) that supports the throat (24) in an adjustable manner, and a front portion of the valve seat forming cylinder (21). ing.

The throat (24) has a base (24a) having a spherical outer circumference, and the base (24a) is connected to the inner circumference of the throat fixing member (25) and the inner circumference of the valve seat forming cylinder (21). Throat support surfaces (25a) (21b) formed on the respective surfaces.
) is slidably fitted in surface contact with the base (2
A cylindrical tip (24b) with a smaller outer diameter than 4a)
The distal end portion (24b) is made to protrude forward, and the distal end portion (24b) can be manually adjusted to swing in any direction up, down, left, or right around the base (24a).

Furthermore, a certain sliding resistance acts on the base (24a) of the throat (20) from the throat support surfaces (25a) and (21b), so that the throat (24) can be stopped at any swing angle.

The base (24a) of the throat (24) is fitted onto the throat support surface (21b), and the top (24°a)
) is located on the same vertical plane as the front end surface of the valve seat forming cylinder (21), and from the center of the base (24a) to the rear end surface (2
4°b) to approximately half the radius of the base (24a), so that the throat support surface (21b
) can be easily fitted into the throat base (24a).

Moreover, the base part (24a) of the throat (24) has an inner circumferential surface of the front half having the same diameter as the inner diameter of the tip part (24b), and an inner circumferential surface of the substantially rear half having an enlarged diameter toward the rear. The same base (
24a) The rear end opening diameter is made larger than the inner diameter of the valve seat forming cylinder (21), so that even when adjusting the swing of the throat (24), the valve seat forming cylinder (21) goes from the valve seat forming cylinder (21) to the throat (24). This allows for smooth inflow of gushing hot water.

Further, the tip end (24b) of the throat (24) extends the tip end surface to the vicinity of the front end surface located inside the bathtub body (1) of the decorative cover (28), and the outer circumferential surface of the end portion (24b) and the makeup A throat swing operation space (28) is formed between the cover (26) and the inner peripheral surface thereof.

The throat swinging operation space (28) is
The throat (24) is formed in a size that allows the bather to swing the throat (24) in any direction by pinching the tip (24b) of the throat (24).

Further, the throat fixing member (25) fits into the front inner peripheral surface of the nozzle casing (20) via the positioning groove,
The front surface (25b) was fixed to the rear end of the decorative cover (26) via a fixing ring (28), and the inner circumferential surface (25a) corresponded to the front spherical surface of the base (24a) of the throat (24). It is formed into a concave spherical surface, and the inner peripheral surface (25a) supports the front outer peripheral surface of the base (24a) of the throat (24) in slidable surface contact.

Further, the valve seat forming cylinder (21) is connected to the nozzle casing (2
0) into the central part of the nozzle casing (20) through the front end opening, and the rear end surface is located near the bullet-feeding vibe connecting part (20c), and is formed on the front outer circumferential surface. The protruding stepped portion (21b) is attached to the nozzle casing (20).
engages with a concave step (201) formed on the inner circumferential surface of the cylinder to restrict backward sliding and rotation around the axis;
Jet flow forming part (50) provided in the valve seat forming body (21) and air mixing part (70) provided in the nozzle casing (20)
Aligning with.

A throat support surface (21c) having a concave spherical surface corresponding to the rear spherical surface of the base (24a) of the throat (24) is formed on the front inner circumferential surface of the valve seat forming cylinder (21). (2 IC), throw as described above) (
The base (24a) of the throat (24) is fitted in surface contact with the base (24a) of the throat (24), whose forward sliding is regulated by the throat fixing member (25). 2I) is restricted from sliding forward.

In addition, the jet flow forming part (50) includes an air mixing part (70) provided in the middle of the valve seat forming cylinder (21), and an air mixing part (70) provided in the middle of the valve seat forming cylinder (21).
A valve seat (21a) that forms a jet flow forming flow path (27) immediately behind the valve seat (21a), and a valve body (21a) for controlling the jet flow rate that opens and closes the jet flow forming flow path (27) by moving toward and away from the valve seat (21a). 22)
, the linear stepping motor (old) for opening and closing the valve body for opening and closing the valve body for full jet adjustment (22), and a rear wall forming plate (29) for supporting the motor (Ml). ing.

As shown in FIG. 4 and FIG. An air inflow path (21d) is formed, and the air inflow path (21d)
The inner intake pipe connecting part (20b) side and the connecting part (20b)
On the side opposite to b), there are air inlets (21e) (
21r) and the same air inlet (21e) (21"
) through the inside of the valve seat forming cylinder (21) to communicate with the intake pipe connecting part (2OL+).
) is formed with an air entrainment section (70). (m) indicates the air inflow direction.

Further, a valve seat (21a) is provided coaxially with the valve seat forming cylinder (21) in the middle part of the valve seat forming cylinder (21) located immediately behind the air mixing part (70), and the valve seat A jet flow forming channel (27) is formed on the axis of the valve seat (21a).
ia) A right-angled corner (21'a) is formed at the inner circumferential edge of the rear end, and an inclined surface (21'a) is formed at the outer circumferential edge of the tip.
The jet flow regulating valve body (22) formed in 22a) is brought into and out of contact, and the jet flow regulating valve body (22) adjusts the opening/closing amount (spray volume and jet pressure) of the jet flow forming channel (27). ) is configured to be adjustable.

Further, the tip of the valve body support rod (23d) provided on the linear stepping motor (Ml) passes through a rod insertion hole (29e) provided in the center of the rear wall forming plate (29), which will be described later. extending into the nozzle casing (2o);
A valve body (22) for adjusting the amount of ejection is attached to the tip of the valve body support rod (23d).

Further, at the rear end of the valve body support rod (23d), there is provided a valve body (22 ) Valve body 2 that detects the opening/closing amount (adjusts the amount of ejection and amount of ejection)! A valve position sensor (231") is installed, and the valve body reference position detection sensor (23r) is connected to the reference position Hall element (231) and the same reference position Hall element (231").
31) and a reference position detection magnet (23j) attached to the rear end position of the opposing valve body support rod (23d).

The valve body reference position detection sensor (23r) includes a reference position Hall element (231) and a reference position detection magnet (
23j) is changed into an electrical change and sent to the control unit (C), which detects the reference position (for example, a fully closed position) and controls the linear Stellar pin motor (C). The number of pulses (rotation angle) from the reference position of Ml) is calculated. (23h) is the coil (
23a) and the valve body reference position detection sensor (2:R).

With this configuration, a linear stepping motor (M
l), the coil (23a) is energized and the magnet (23a) is energized.
The rotor nut (23c) is rotated together with b), and the valve body support rod (23c) is rotated in conjunction with the rotor nut (23c).
d) to move the valve body (22) attached to the tip of the valve body support rod (23d) to the valve seat (21).
a), so that the ejection amount and ejection pressure can be adjusted.

Moreover, the opening/closing amount of the ejection amount regulating valve body (22) is as follows:
The result of the reference position detected by the valve body reference position detection sensor (23r) is sent to a control unit (C) to be described later, and the control unit (C) controls energization to the coil (23a) based on the result, The jet amount regulating valve body (22) is properly opened and closed so that the bath jet amount into the bathtub body (1) and the bath jet pressure can be finely adjusted.

Further, a waterproof cover (40
) is installed. This waterproof cover (40) surrounds the tip of the valve body support rod (23d) and covers the same wood (23d).
23d) The motor for opening and closing the valve body (M
The mounting flange (30) provided on the periphery of the rear end is watertightly attached to the front surface of the rear wall forming plate (29) in the nozzle casing (20). Installed in condition.

The waterproof cover (40) is attached to the valve body support rod (23).
It is configured in a bellows shape so that it can expand and contract in the front and back direction in conjunction with the forward and backward movement of d).

Further, the above-mentioned valve body (22) for regulating the ejection amount, which is integrally formed with the waterproof cover (40), is molded from synthetic resin such as polytetrafluoroethylene or nylon 11 in this embodiment.

Further, (44) is a cover for preventing hair from getting caught in the bellows-shaped waterproof cover (40), and the cover (44) is used for installation. It can also be detachably attached to the flange (30) and removed when unnecessary. Also, (20m) is an air breathing port.

Further, the rear wall of the nozzle casing (20) described above is a rear wall forming plate (29) that is separate from the nozzle casing (20).
), and the rear wall forming plate (29) has a disc shape with a diameter between the inner diameter of the rear end of the nozzle casing (20) and the diameter, and is attached from the front end opening of the nozzle casing (20). It is fitted and installed in a removable manner.

Then, the rear wall forming plate (29) is attached to the nozzle casing (29).
0) Rear wall forming plate regulating piece (20g) formed on the inner peripheral surface of the rear end
) to restrict rearward sliding by abutting and locking the rear peripheral edge, and at the same time, the front surface Sliding forward is restricted by abutting and locking the peripheral edge. (29a) is a packing provided on the peripheral surface of the rear wall forming plate (29).

Moreover, the outer diameter of the motor casing (23) described above is
It is formed to have a smaller diameter than the inner diameter of the rear end opening (20k) of the nozzle casing (20) formed by the inner peripheral surface of the rear wall forming plate (29).

With this configuration, the rear wall forming plate (29) can be attached to the nozzle casing (20) by removing the valve seat forming cylinder (21) that restricts forward sliding of the rear wall forming plate (29). It can be removed from the front end opening of the
The linear stepping motor (Ml) attached to 9) has a smaller diameter than the inner diameter of the rear end opening (20k) of the nozzle casing (20), so it can be removed integrally with the rear wall forming plate (29). .

In addition, the linear stepping motor (Ml) is installed outside the bathtub main body (1) as needed on the rear wall forming plate (2).
9) It can also be removed.

Further, the jet nozzles (2), (3), and (4) can be adjusted by a remote controller (30) (see FIG. 6).

Next, the overall structure of the bubble generating bathtub (A) equipped with the above-described jet nozzle (2) will be explained based on FIGS. 6 and 7.

That is, the bubble-generating bathtub (A) has a bathtub body (1) formed in a box shape with an opening on the top surface, and has jet nozzles (2) for the feet, dorsal side, and ventral side on the front and rear walls and left and right side walls, respectively. 2)
(3) (3) (4) A total of six (4) are provided. Note that the jet nozzle (:() (4) is the jet nozzle (2).
), the spray volume and pressure of the bath can be changed automatically.

The bathtub body (1) has a flange-like edge (1a) of a constant width formed on the periphery, and an air intake portion (5) on the edge (1a).
), and vertically elongated recesses (lb) (lb) with a V-shaped cross section are formed approximately at the center of the left and right side walls;
b) On the sloped surface (1'b) of the side facing the rear wall (dorsal side),
The vent nozzle (4) (4) is attached toward the center of the rear wall.

In addition, a pump protection case (9) is arranged outside the bubble generating bathtub (A), and inside the case (9),
A circulation pump (P) that circulates bath water and the same pump (P)
A filtration machine 43) that filters the bath circulated by the pump (P) and a pump drive motor CM) that drives the same pump (P)
and a control section <C) that controls the driving of the motor (M) and the linear stepping motor (Ml).

Furthermore, a bath circulation channel CD) is interposed between the circulation pump (P) and the bubble generating bathtub (A).

That is, the bath water circulation flow path CD) is connected to the bubble generating bathtub (A).
A bath water suction vibrator (10) for sending bath water from the circulation pump (P) to the bathtub (^) from the circulation pump (P).
It consists of a bath water bullet delivery vibrator (11) for sending bath water to the body.

And the bath suction vibe (lO) is attached to the bathtub body (1).
One end is opened at the bottom of the circulation pump (P), and the other end is communicated with the water intake port of the circulation pump (P) so that the bath water is sucked into the circulation pump (P).
), one end of which communicates with the spout of the spout nozzle (2) (
3) The other end is connected to (4) in communication.

In addition, a pressure detection sensor (not shown) for detecting the pressure of the bath water being pumped through the pipe (11) is installed in the middle of the bath water pumping vibrator (11), and the detection result from the sensor is installed. is sent to the control unit <C>, and the control unit (C) controls the jet pressure of the bath air jetted from each jet nozzle (2), (3), and (4).

In addition, as shown in FIG. 8, the air intake section (5) described above communicates the negative ends of the intake vibes (12) with the front and rear walls of the intake vibe connection section (83) provided at the center of the bottom surface, respectively. The air intake section (5) is connected to the intake vibe connection section (83) and the air taken in from the air intake port provided at the top of the air intake section (5) is connected to the intake vibe connection section (83).
It is sent through the inside to each intake pipe (12) (12), and from each intake pipe (12) (12) to each jet nozzle (2) (
3) Air can be supplied to (4).

In Fig. 8, (84) beam actance type silencer, (
Reference numeral 85) is a check valve, and the check valve (85) prevents the bath from flowing backward through the intake pipe (12).

(F) Effect The present invention has a spiral rotor nut side ball groove formed on the inner peripheral surface of the rotor nut, and a spiral rod side ball groove formed on the outer peripheral surface of the rod in the same direction as the rotor rear side ball groove. Since a plurality of balls are rotatably interposed between the rods, the efficiency of converting the rotational torque of the rotor nut into linear motion of the rod can be greatly increased by the balls.

For that reason, the thrust of the rod can be increased! l
(It is possible to maintain high resolution for a long period of time, increasing reliability, and it is also possible to reduce the size and power consumption.

[Brief explanation of the drawing]

FIG. 1 is an enlarged sectional view of a linear stepping motor according to the present invention. FIG. 2 is an explanatory diagram of characteristics of efficiency and lead angle for converting rotational torque into linear motion. FIG. 3 is an enlarged sectional view of the jet nozzle. FIG. 4 is a rear view of the same jet nozzle. FIG. 5 is a sectional view taken along the line I-■ in FIG. 3. FIG. 6 is a perspective view of a bubble-generating bathtub equipped with an ejection nozzle using a linear stepping motor according to the present invention. FIG. 7 is a plan view of the bubble-generating bathtub. FIG. 8 is a sectional view of the intake pipe. (A): Bubble-generating bathtub (P) (C) (Ml) (lO) Circulation pump control unit Linear stepping motor Bathtub body Leg side spout nozzle Back spout nozzle Ventral spout nozzle Bath water suction vibe Bath water bullet feeding vibe

Claims (1)

[Claims] (1) A cylindrical magnet is arranged concentrically within a cylindrical coil, and the magnet can be rotated by energizing the coil. Inside the magnet, there is a rotor nut side with a spiral shape on the inner peripheral surface. A cylindrical rotor nut with a ball groove is installed concentrically and integrally, and a rod with a spiral rod-side ball groove on the outer circumferential surface in the same direction as the rotor nut-side ball groove slides forward and backward inside the rotor nut. A plurality of balls are freely inserted between the opposing ball grooves on the rotor nut side and the ball groove on the rod side, allowing the rod to move forward and backward steplessly over minute distances in conjunction with the rotor nut, which rotates integrally with the magnet. A linear stepping motor that can be operated.