JPH08117254A - Oral cavity cleaner - Google Patents

Abstract

PURPOSE: To properly remove the air stagnating in the compression chamber of a pump and spray a liquid from a nozzle at the preset spray pressure. CONSTITUTION: Regarding a structure having a cylinder 21 with a tank 6, a suction port 24a, a discharge port 23a and a compression chamber 23b as well as a piston 22, a pump 20 for drawing a liquid in the tank from the port 24a to the chamber 23b on the reciprocal motion of the piston 22 and discharging the liquid from the port 23a, a nozzle 2 for jetting the liquid from the port 23a, and a drive section 12 for causing the reciprocal motion of the piston 22, the cross section of the end of the chamber 23b at the side of the port 23a over the prescribed length is formed to change in a substantially continuous way, so as to become equal to the cross section of the port 23a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oral cavity cleaner used as an oral hygiene tool, and more particularly to a pump structure thereof.

[0002]

2. Description of the Related Art As an oral cleaner of this kind, a tank for storing a liquid such as water, a cylinder having a suction port, a delivery port, and a compression chamber, and a piston reciprocally arranged therein are provided. A pump for sucking the liquid in the tank from the suction port to the compression chamber by the reciprocating movement of the piston and delivering the liquid from the delivery port;
A nozzle for ejecting the liquid delivered from the delivery port to the outside,
A drive unit that reciprocates a piston and is configured to eject liquid from a nozzle toward a mouth with a predetermined ejection pressure and a predetermined pulsation number is generally known. This mouthwash not only cleans the teeth by jetting intermittently pulsating jet stream into the oral cavity to clean the food waste caught between the teeth, but also gives a massage effect to the teeth and gums, It is useful for improving circulation and improving the condition of tooth and gum tissues (gingival tissues).

In this mouth washer, as a pump structure for urging the liquid sucked from the tank by the pump so as to have a predetermined jet pressure, for example, an actual open flat plate 3-850.
There is one disclosed in Japanese Patent No. As shown in FIG. 4, this pump structure includes a cylinder 51 having a suction port 51a, a delivery port 51b, and a compression chamber 51c, a piston 52 reciprocally arranged inside the cylinder 51, and an inside of the cylinder 51. And a suction valve 53 for opening and closing the liquid passage of the
It is configured to be located above 51a, and when air enters the compression chamber 51c from the suction port 51a, it exits from the delivery port 51b.

[0004]

However, in the above-described pump structure of the oral cavity cleaner, when air enters the compression chamber 51c through the suction port 51a, a part of the air flows out through the delivery port 51b. Other than the above, there is a problem that they stay in the upper corners of the compression chamber 51c, etc., and as a result, the ejection pressure of the liquid ejected from the nozzle decreases, and a prescribed ejection pressure cannot be obtained.

The present invention has been made in view of the above circumstances, and an object thereof is to reliably remove the air that has entered the compression chamber of the pump and eject the liquid from the nozzle at a predetermined ejection pressure. An object of the present invention is to provide a mouthwash that can be used.

[0006]

In order to achieve the above object, an oral irrigator according to claim 1 has a tank for storing a liquid, a cylinder having an inlet, an outlet, and a compression chamber, and an inside thereof. A reciprocatingly arranged piston, the reciprocating movement of the piston sucks the liquid in the tank from the suction port into the compression chamber and delivers it from the delivery port, and the liquid ejected from the delivery port is ejected to the outside. In the oral irrigator equipped with a nozzle that drives the piston and a drive unit that reciprocates the piston, the compression chamber is configured so that the cross-sectional shape of the end portion of the predetermined length on the delivery port side is equal to the cross section of the delivery port. It is formed so that it continuously changes.

According to a second aspect of the present invention, there is provided an oral lavage device in which the compression chamber of the first aspect is formed in a substantially conical shape.

According to a third aspect of the present invention, there is provided an oral lavage device according to the first or second aspect of the present invention, wherein the tip portion of a predetermined length has a sectional shape of a predetermined length on the delivery side of the compression chamber. It is formed so as to have substantially the same shape as the cross section.

[0009]

According to the structure of claim 1, when air enters the compression chamber, there is no place where air can stay between the outlet of the compression chamber and the outlet of a predetermined length. Therefore, the air can be reliably delivered from the delivery port.

According to the second aspect of the invention, when the air enters the compression chamber, the air easily moves toward the outlet, so that the air is delivered from the outlet in a relatively short time. You can

According to the third aspect of the present invention, the tip of the piston having the predetermined length can be brought closer to the end of the compression chamber having the predetermined length on the delivery port side. When the air enters, the air can be more reliably delivered from the delivery port.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIGS.

The oral cavity washing machine comprises a washing machine body 1 and a nozzle 2 which can be attached to and detached from the washing machine body 1, and a liquid such as water is ejected from the nozzle 2.

A casing 3 which is an outer shell of the cleaner main body 1
Is composed of a long tubular portion 3a and a short tubular portion 3b integrally provided on a side surface on one end side of the long tubular portion 3a. A detachable lid 4 is provided at an opening on one end side of the short tubular portion 3b. A sealing 5 is provided on the outer peripheral surface of the lid 4, and the lid 4 is water-tight when attached to the opening on the one end side of the short tubular portion 3b. A tank 6 for storing liquid is provided at the opening on the other end side of the short tubular portion 3b, and the short tubular portion 3b and the tank 6 are provided.
A sealing 7 is provided at the connecting point with.

The long tubular portion 3a is provided with a connecting portion 3c having a substantially tubular shape, and a tube 8 is fitted in the connecting portion 3c. The bottom of the long tubular portion 3a is provided with an electrical connection portion 9 that is electrically connected to an external power supply device or the like (not shown). The charging circuit 1 is located inside the electric connection portion 9 of the long tubular portion 3a.
0, a storage battery 11, a drive unit 12 are provided, and an electrical connection unit 9
The charging circuit 10 with the power supply device and the like electrically connected
Electricity is supplied to the storage battery 11 from the power supply device or the like, and one of the storage battery 11 to the drive unit 12 is operated by operating the operation switch 13 provided on the side surface of the long tubular portion 3a with the power supply device or the like removed from the electrical connection portion 9. Electricity is supplied to the motor 14, which is a constituent member.

The drive unit 12 includes a motor 14, a pinion 15 fixed to a rotation shaft of the motor 14, a face gear 17 supported by a shaft pin 16 and meshing with the pinion 15, and a face gear 17
A circular protrusion 18 formed integrally at an eccentric position of the pump 20 and a pump 20 to be described later so as to surround the outer peripheral surface of the circular protrusion 18.
Connecting rod 19 connected to the piston 22, which is a component of
It consists of and. The drive unit 12 is not limited to the one in this embodiment, and may be any unit configured to reciprocate the piston 22.

The pump 20 is mainly composed of a cylinder 21 and a piston 22 which is reciprocally disposed inside the cylinder 21 and has a substantially flat end portion.

The cylinder 21 is composed of a cylinder body 23 having a substantially cylindrical shape and a tube body 24 provided on a side surface of the cylinder body 23, and a sealing 25 is provided at a connecting portion thereof. The tube 24 has an opening at the tip thereof as the suction port 24a. By fitting the above-mentioned tube 8 to the inner surface of the tip, the liquid in the tank 6 is transferred from the suction port 24a into the cylinder 21 through the tube 8. It is supposed to be inhaled.

The liquid passage 24b in the tube 24 has a small cross section on the suction port 24a side and a large cross section on the cylinder body 23 side, and these boundaries are tapered in plan view. This liquid passage 24b
A suction valve 27 supported by a valve support 26 so as to be movable in a predetermined range in the axial direction of the liquid passage 24b is provided at a portion having a large cross section. The suction valve 27 has a substantially conical shape on the suction port 24a side.
When it is on the side of 24a, the portion of the liquid passage 24b which is tapered in plan view is closed, and when it is on the side of the cylinder body 23, the liquid passage 24b is opened.

Inside the cylinder body 23, there is provided a delivery port 23a having a cross section smaller than that of the portion where the piston 22 reciprocates, and is formed by the delivery port 23a and the tip of the piston 22. The space is the compression chamber 23b,
The capacity of the compression chamber 23b is maximum when the amplitude of the piston 22 is minimum, and is minimum when the amplitude of the piston 22 is maximum (FIG. 2). In addition, the compression chamber 23b is formed so that the portion where the piston 22 does not reciprocate has a substantially conical shape, that is, the cross-sectional shape approaches the cross-section of the delivery port 23a as it approaches the delivery port 23a from the piston 22. The liquid passage 24b of the pipe body 24 described above communicates with the liquid passage 24b.

A relay member 28 for guiding the liquid delivered from the delivery port 23a to the nozzle 2 by fitting the base end of the nozzle 2 into the recessed hole 28a is provided on the opposite side of the cylinder body 23 from the piston 22. A sealing 29 is provided at the joint between the cylinder body 23 and the relay member 28. Inside the relay member 28, a delivery valve 30 supported so as to be movable in a predetermined range in the axial direction is provided. Delivery valve 30
Has a substantially conical shape on the side of its outlet 23a, which closes or opens the outlet 23a.

In FIG. 1, 31 and 32 are sealings, and 33 is a nozzle holding member that holds the nozzle 2 so that it can be detachably attached to the cleaner main body 1.

Next, the operation of this embodiment will be described.
The storage battery 11 is assumed to be fully charged in advance.

First, when the lid 4 is detached and a liquid is injected into the inside from the opening at the one end side of the short tube portion 3b, the liquid is stored in the tank 6.
Stored in. And when the liquid injection is completed, the lid
Wear 4.

Next, the operation switch 13 is operated to operate the drive unit.
When the piston 12 is driven, the piston 22 reciprocates in the cylinder body 23, and the liquid in the tank 6 passes through the tube 8 and the suction port 24.
It is led from a to the liquid passage 24b. At this time, the piston 22
Of the suction valve 27 opens the liquid passage 24b and the delivery valve 30 opens the delivery port 23a.
And the liquid is introduced into the compression chamber 23b. Conversely,
When the piston 22 moves in the direction of increasing its amplitude,
The suction valve 27 closes the liquid passage 24b, the delivery valve 30 opens the delivery port 23a, and the liquid in the compression chamber 23b is delivered at high pressure from the delivery port 23a. That is, when the piston 22 reciprocates,
The jet flow that pulsates intermittently is ejected from the nozzle 2.

Here, when air enters the compression chamber 23b through the suction port 24a or the like, the portion of the compression chamber 23b where the piston 22 does not reciprocate has a cross-sectional shape that approaches the delivery port 23a from the piston 22. Since it is formed so as to come close to the cross section, the air does not stay at this portion, and the air can be reliably delivered from the delivery port 23a. Further, since the portion of the compression chamber 23b where the piston 22 does not reciprocate has a substantially conical shape, the air is sent to the outlet 23
It becomes easier to move toward a and the air can be sent out from the outlet 23a in a relatively short time.

Therefore, in this embodiment, when the air enters the compression chamber 23b through the suction port 24a or the like, the air is reliably delivered from the delivery port 23a in a relatively short time.
The liquid can be ejected from 2 at a predetermined ejection pressure.

In this embodiment, the portion of the compression chamber 23b where the piston 22 does not reciprocate is formed in a substantially conical shape, but the present invention is not limited to this, and the portion from the piston 22 to the delivery port
The cross-sectional shape may be formed in a substantially step shape so as to approach the cross section of the delivery port 23a as it approaches 23a.

Further, in the present embodiment, the jet flow pulsating intermittently is ejected from the nozzle 2, but the jet flow not pulsating may be ejected from the nozzle 2.

Next, a second embodiment of the present invention will be described with reference to FIG. It should be noted that members having substantially the same functions as those in the previous embodiment are designated by the same reference numerals and the description thereof will be omitted.

The present embodiment is a modification of the pump 20 of the first embodiment, and has a predetermined length of the piston 22 so that the piston 22 can also be operated to a portion of the compression chamber 23b having a substantially conical shape. The tip is formed in a roughly conical shape, and the piston
The amplitude of 22 is configured to be large. That is, the piston 22 is formed such that the cross-sectional shape of the tip portion of the predetermined length is substantially the same as the cross-section of the compression chamber 23b where the cross-section is substantially conical.

Therefore, in this embodiment, since the tip portion of the piston 22 having the predetermined length can be brought closer to the wall surface of the compression chamber 23b, which is a substantially conical portion,
When the air enters the compression chamber 23b, the air can be more reliably delivered from the delivery port 23a.

[0033]

In the mouth washer according to the first aspect of the present invention, when air enters the compression chamber, air can stay between the outlet of the compression chamber and the outlet having a predetermined length. Since there is no, it is possible to reliably send out the air from the outlet,
As a result, the liquid can be ejected from the nozzle at a predetermined ejection pressure.

In addition to the effect of the first aspect, the oral lavage device according to the second aspect makes it easier for the air to move toward the outlet when the air enters the compression chamber. It can be delivered from the delivery port in a short time.

In addition to the effects of the first or second aspect, the mouthwash according to the third aspect further brings the tip of the piston having a predetermined length closer to the end of the compression chamber having a predetermined length on the outlet side. Therefore, when air enters the compression chamber, the air can be more reliably delivered from the delivery port.

[Brief description of drawings]

FIG. 1 is a cutaway sectional view of a first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of an essential part showing a state where the amplitude of the piston is maximized.

FIG. 3 is an enlarged sectional view of an essential part showing a state in which the amplitude of the piston of the second embodiment of the present invention is maximized.

FIG. 4 is an enlarged cross-sectional view of a main part of a conventional example.

[Explanation of symbols]

 2 Nozzle 6 Tank 12 Drive 20 Pump 21 Cylinder 22 Piston 23a Outlet 23b Compression chamber 24a Inlet

Claims (3)

[Claims] 1. A liquid tank is provided with a tank for storing liquid, a cylinder having a suction port, a delivery port, and a compression chamber, and a piston reciprocally arranged therein. In the oral cavity cleaning device provided with a pump for sucking into the compression chamber from the suction port and delivering it from the delivery port, a nozzle for ejecting the liquid delivered from the delivery port to the outside, and a drive unit for reciprocating the piston, The chamber is formed so that the cross-sectional shape of an end portion of a predetermined length on the delivery port side is substantially continuously changed so that it is equal to the cross section of the delivery port. 2. The oral lavage device according to claim 1, wherein the compression chamber is formed into a substantially conical shape. 3. The piston is formed so that a cross-sectional shape of a tip portion of a predetermined length is substantially the same as a cross-section of an end portion of the compression chamber on the delivery side of the compression chamber. The oral cavity cleaner described.