JPS5850894Y2 - Oral hygiene device pressure reduction mechanism - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a pressure reduction mechanism for an oral hygiene device.

An oral hygiene device is a device used to prevent tooth decay, treat gum tissue, or treat inflammation in the oral cavity. A liquid urging device that suctions and discharges the liquid in the tank to generate an intermittent flow, a check valve that is interposed between the liquid urging device and the storage tank and opens by the suction force of the liquid urging device, and the liquid It is connected to the discharge port of the urging device to eject liquid, and includes a handle that has an on-off valve for the discharge liquid path.

According to the conventional oral hygiene device, when the on-off valve of the handle is closed to stop the ejection of liquid while the liquid urging device is in operation, the internal pressure of the liquid urging device increases.

As a result, the motor is forced to work harder, requiring the use of a high-torque motor, which is disadvantageous in that it becomes expensive.

In addition, if the internal pressure of the liquid energizing device is high, even a small amount of wear will cause a large pressure loss, and there is a risk of frequent water leaks, so be sure to turn off the motor switch when stopping the jetting. The operation was cumbersome, and even if an on-off valve was provided at hand, it was not fully utilized.

The present invention proposes a pressure reduction mechanism for an oral hygiene device that eliminates the above-mentioned drawbacks, extends the life of the liquid energizing device, and improves safety.

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is a partial cross-sectional view of the liquid urging device. Code 1 in the diagram
is a connection pipe to a liquid storage tank (not shown).

This connecting pipe 1 is connected to a head 2 of a liquid urging device A.

The head 2 is divided into a liquid reservoir chamber 2a and a suction chamber 2b by a partition plate 3.
The partition plate 3 is provided with two through holes.

One of the through holes is closed by a check valve body 5 that is pressed by a coil spring 4 from the suction chamber 2b side.

The check valve body 5 consists of a valve part 5a and a valve stem 5b, and the valve part 5a has a hemispherical shape, and a spherical valve seat 3 provided in a through hole.
Close to a.

The valve rod 5b has one end fixed to the valve portion 5a, the other end slidably inserted into a wall 6a with the cylinder 6, and a coil spring 4 spirally wound in the middle portion.

The other through hole is closed by a valve body 8 that is pressed by a coil spring 7 from the liquid reservoir chamber 2a side.

The valve body 8 is a sphere, and is in close contact with a spherical valve seat 3b provided in the through hole, and is pressed by a coil spring 7 whose one end is supported by a convex portion 2C projecting into the liquid reservoir chamber 2a.

The cylinder 6 consists of a cylinder head 6b and a cylinder body 6C in which a piston 9 reciprocates, and a plurality of through holes 6d are formed in the wall 6a to communicate the suction chamber 2b with the inside of the cylinder head 6b.

The piston 9 is connected to a drive device such as a motor (not shown) and slides inside the cylinder body 6C, and a gasket 10 is inserted to prevent liquid leakage.

A joint 6e protruding outward from the cylinder head 6b is provided to connect a flexible tube 11 connected to the handle, and is tightened with a fixed ring 12.

FIG. 2 is a partial cross-sectional view of the handle.

The handle B includes a gripping rod 13 and a nozzle 1 that can be attached to and detached from the gripping rod 13.
It consists of 4.

The gripping rod 13 is provided with a joint 13 a projecting outward, into which a flexible tube 11 connected to the joint 6 e of the liquid urging device A is fitted and tightened with a fixed ring 15 .

A valve body 16 is provided on the gripping rod 13 to open and close a liquid flow path 13b leading to the joint 13a.

This valve body 16 consists of a valve part 16a and a knob part 16b, and the valve part 16a fitted with a gasket 17 is slid within the liquid circulation space 13C to block the flow path 13b.

The valve portion 16a can be slid by providing a knob portion 16b integrated therewith on the outside of the gripping rod 13 and operating the knob portion 16b with a finger.

The nozzle 14 is inserted into the circulation space 13C with the connecting portion 14a in contact with the gasket 18, and is coupled to the gripping rod 13.

A nozzle part 14C is integrally formed from the connecting part 14a via a collar part 14b, and the tip of the nozzle part 14C is bent so that it can be easily applied to the root canal in the oral cavity.

A flow path 14d is provided in the center of the nozzle 14, penetrating from the tip of the connecting portion 14a to the tip of the nozzle portion 14C, and the liquid is ejected from the spout 14e of the nozzle portion 14C.

When the on-off valve body 16 of the handle B is closed, the piston 9
The hydraulic pressure during the discharge stroke is applied to the valve body 8.

This liquid pressure moves the valve body 8 against the spring force of the coil spring 7, so that liquid flows from between the valve body 8 and the valve seat 3b into the liquid reservoir chamber 2a.
The pressure inside the head 6b including the suction chamber 2b is reduced.

FIG. 3 is a sectional view of the liquid urging device A in FIG. 2, in which the check valve is provided with a pressure adjustment mechanism.

Therefore, members common to those in FIG. 2 will be explained using the same reference numerals.

A portion of the valve portion 5a of the check valve body 5 projects into the liquid reservoir chamber 2a of the head 2, and a push rod 18 of the pressure adjustment mechanism is brought into contact with the top portion.

In the pressure adjustment mechanism, a push rod 18 is fixed to an adjustment screw 19, and this adjustment screw 19 is screwed into a screw fixing part 2d provided on the head 2, and a gasket 20 is fitted to the push rod 18 to maintain waterproofness. are doing.

Thus, the gap between the valve portion 5a and the valve seat 3a can be adjusted by tightening the adjustment screw 19, and the ejection pressure from the nozzle can be adjusted.

With the pressure adjustment mechanism as described above, the valve part 5a and the valve seat 3a
Even if a gap is provided between the two, the pressure inside the cylinder head 6b cannot be completely released to the liquid reservoir chamber 2a when the on-off valve of the handle is closed. The excess pressure that is not present moves the valve body 8 against the spring force of the coil spring 7 and escapes from between the valve body 8 and the valve seat 3b.

FIG. 4 is a sectional view showing a state in which the liquid storage tank C is directly connected to the liquid urging device.

The discharge port 21 protruding from the bottom of the storage tank C is inserted into the head 22 of the liquid urging device via the gasket 23.

A blocking piece 24 is provided inside the discharge port 21 to block the discharge port 21 by hydraulic pressure, but when inserted into the head 22, the cutoff valve 24 is pushed up by a push rod 25 provided inside the head 22.

The head 22 is divided into a liquid storage chamber 22a by a partition wall 22b.
and a suction chamber 22C are formed, and two through holes are bored in the partition wall 22b.

One through hole has a liquid reservoir chamber 22a and a spherical valve seat 2 on the side a.
2 d is provided to bring the spherical valve body 26 into contact, and the coil spring 2
Press with 7.

The other through hole is provided with a similarly spherical valve seat 22e on the side of the suction chamber 22C, so that the valve portion 28a of the check valve body 28
contact.

The valve stem 28b, which is fixed to the valve part 28a, is slidably supported by a support plate 29, and is attached to the valve part 28 by spiraling a coil spring 30.
a to the valve seat 22e.

The suction chamber 22C is continuous with the cylinder 31 and is connected to the piston 3.
The check valve body 28 is moved by the reciprocating motion of 2 to aspirate and discharge liquid.

When discharging liquid, a plurality of holes 29 are formed in which support plates 29 are formed.
The liquid passes through the flexible tube 11 to the handle B in FIG.
Sent by

When the on-off valve of the handle B is closed, the internal pressure between the suction chamber 22C and the valve body 16 of the handle B increases due to the reciprocating movement of the piston 32.

A pressure greater than the spring force of the coil spring 27 is applied to the suction chamber 22.
C, this pressure acts against the spring force to force the valve body 26
is pushed up, and the suction chamber 22C is depressurized.

In the embodiment described above, the valve bodies 8 and 26 are made of spheres, but the present invention is not limited to this, and semispherical or conical valve bodies may be used.

As described above, according to the present invention, even if the on-off valve of the handle is closed to stop the ejection of liquid, the pressure inside the liquid urging device is reduced by the valve body.

Therefore, the life of the oral hygiene device is extended because the drive device such as the motor operates smoothly without any load being placed on it, and no stress is placed on other parts.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a liquid urging device showing an embodiment of the present invention;
FIG. 2 is a partial sectional view of the handle, FIG. 3 is a sectional view of a liquid urging device having a pressure adjustment mechanism, and FIG. 4 is a sectional view of a liquid urging device connecting a storage tank. A, D... Liquid urging device, B... Handle, C... Storage tank, 3a, 3b, 22a, 22e
...Valve seat provided in the through hole, 8.26...
・Valve body, 7, 27... Spring.

Claims (1)

[Scope of utility model registration request] a liquid storage tank; connecting to the storage tank and sucking the liquid;
a liquid energizing device that discharges the liquid to generate an intermittent flow; a check valve that is opened by the suction force of the liquid energizing device, and a check valve that is disposed between the storage tank and the liquid energizing device; and a flow path for spouting the liquid. In an oral hygiene device comprising a handle having an on-off valve, a partition wall is provided between the storage tank and the liquid urging device, a plurality of on-off valve bodies are arranged on the partition wall, and a plurality of on-off valve bodies are disposed on the partition wall, and one of the valve bodies is , one valve body is configured to be opened by the suction force of the liquid urging device, and the other valve body is configured to be opened in response to the discharge pressure of the liquid urging device. Decompression mechanism.