JPS6023585Y2 - diaphragm valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a diaphragm valve used, for example, in dental treatment equipment.

[Prior Art] As is well known, a diaphragm valve is provided in a passage with a suction pump in a suction device that suctions and removes saliva, tooth cuttings, cleaning fluid, etc. from the oral cavity during dental treatment.

Conventionally, in this type of diaphragm valve, when using a suction device, compressed air is supplied to the diaphragm valve to deform the diaphragm to one side, and the valve body connected to the diaphragm is lifted to open the valve seat. Furthermore, when the suction device is not in use, the diaphragm is pressurized with a spring or the like to deform the diaphragm to the other side and press the valve body against the valve seat opening.

[Problem that this idea attempts to solve]

However, since the diaphragm is generally made of rubber or the like, it is difficult to constantly deform the diaphragm to one side or the other as in the conventional case described above.
This results in early deterioration, and when used for a long period of time, the valve cannot operate reliably, resulting in the inconvenience of requiring periodic maintenance.

This invention solves these conventional problems.

[Means for solving problems]

In order to solve the above-mentioned conventional problems, the diaphragm valve of this invention has a suction passage in the valve box that communicates with the inner chamber of the valve box and is connected to the suction source side, and a suction passage that communicates with the inner chamber of the valve box. and a suction passage connected to the suction hose side, respectively.
The valve body is equipped with a valve body whose valve seat opening is the opening of the suction passage in the valve body, and a diaphragm case is attached to the outside of the valve body. a plug such that the valve body closes the suction passage when the diaphragm is in an undeformed configuration and opens the suction passage when the diaphragm is deformed into a chamber on one side within the diaphragm case. The diaphragm and the valve body are connected to each other by a valve shaft, and the diaphragm case is provided with a passageway for guiding working air that deforms the diaphragm into a chamber on one side of the diaphragm case into a chamber on the other side of the diaphragm case. It is characterized by forming.

[Effect]

In the diaphragm valve of this invention, when the diaphragm is deformed, the valve body opens the suction passage, while when the diaphragm is not deformed, the valve body closes the suction passage without applying external force to the diaphragm.

Example An embodiment of this invention will be described below with reference to the drawings.

Reference numeral 1 in FIGS. 1 and 2 denotes a valve box, in which a suction passage 2 and a suction passage 3 are communicated with each other.

A valve seat 4 is formed at the upper end of the suction passage 2, and a valve seat opening 4a thereof is opened and closed by a valve body 5.

A diaphragm case 6 is attached to the upper surface of the valve box 1.

This diaphragm case 6 is constructed by sandwiching a diaphragm 7 between an upper lid 6a and a lower M6b.

The valve shaft 8 installed upright on the valve body 5 passes through the diaphragm 7 through a hole 9 provided in the center of the lower cover 6b of the diaphragm case 6.
The center hole (not shown) is passed through the nut 1, and the middle part thereof is
The diaphragm 7 is connected to the diaphragm 7 through a washer 11 and an upper part of the diaphragm case 6.

Therefore, the recess 6 of the lower cover 6b of the diaphragm case 6
Working air is supplied into 1b from a passage described later, and the working air pressure causes the diaphragm 7 to move into the recess 61a of the upper lid 6a.
When expanded inward, the valve stem 8 is guided by the holes 9 and 12 and moves upward.

The upper surface of the diaphragm 7 has a recess 61a in the upper lid 6a.
A coil spring 14 is interposed between the inner surface and the inner surface.

This coil spring 14 assists when the diaphragm 7 is restored by its own elasticity when the supply of working air is stopped.

The valve body 5 closes the valve seat opening 4a by suction air pressure from a suction pump (not shown) connected to the suction passage 2.

When the valve body 5 closes the valve seat opening 4a, the length of the valve stem 8 is adjusted so that the diaphragm 7 to which the valve body 5 is connected is not deformed as shown in FIG. is set in advance.

Therefore, when the valve seat port 4a is closed, no can pressure is applied to the diaphragm 7.

Further, a first supply passage 15a and a second supply passage 15b are formed in the thick portion of the upper M6a.

One end of the first supply passage 15a extends to the lower lid 6b.
The opening 15a' is formed at the inner surface of the recess 61b, and the other end is opened approximately at the center of the upper surface of the upper lid 6a.

Further, one end of the second supply passage 15b has an opening 15b' adjacent to the other end opening 15a' of the first supply passage 15a at approximately the center of the upper surface of the upper lid 6a, and the other end is opened at the left side of the upper surface of the upper lid 6a. are doing.

The upper surface of the diaphragm case 6 has an opening 15a'.
A block 16 is attached so as to cover and 15b'.

A port 17 is formed on the upper surface of this block 16, and working air is not supplied to this port 17 from an air source (not shown).

Further, passages 1B and 19 are formed inside the block 16 and communicate with the port 17, and one passage 18 opens at the lower surface of the block 16 and communicates with the other end opening of the second supply passage 15b. , and the other passage 19 opens at the side of a screw hole 20 formed in the upper surface of the block 16.

A needle valve 21 is screwed into this screw hole 20, and a needle 21a of the needle valve 21 faces into a passage 22 formed on the lower surface of the screw hole 20 so as to adjust the opening area of the passage 22. It has become.

The passage 22 is connected to a port 23 formed on the side of the block 16.
A recess 24 formed on the lower surface of the block 16
It also communicates with

This recess 24 faces the openings 15a/15b', and a rubber piece 25 for closing the openings 15a'915b' is provided inside the recess 24.

The rubber piece 25 is expandable within the recess 24.

Further, an air switch 23a is connected to the port 23.

In the figure, 26 is a pipe joint screwed onto the suction passage 2, and 27 is a pipe joint screwed onto the suction passage 2.
29 is a suction hose connected to this pipe joint 26 via an O-ring 28; 29 is a pipe joint screwed onto the suction passage 3; 30
is a suction hose connected to this pipe joint 29 via an O-ring 31.

Next, the operation of the above device will be explained.

With the air switch 23a closed, operating air is supplied to the port 17 from an air source (not shown), and a suction pump (not shown) connected to the suction hose 27 is operated.

(See FIG. 1) In this state, the air pressure in the opening 15b' and the air pressure in the recess 24 are equal, and the rubber piece 25 closes the openings 15a' and 15b', leading to a No working air is supplied to the first supply passage 15a, and the valve body 5 closes the valve seat opening 4a by suction air pressure from the suction hose 27.

In this way, the valve body 5 is directly affected by the suction air pressure to close the valve seat port 4a, and no external force is applied to the diaphragm 7, which remains undeformed as shown in FIG. It will be done.

When suctioning saliva, etc. in the oral cavity using a suction tool (not shown) connected to the suction hose 30, press the air switch 2.
Open 3a.

Then, as shown in FIG. 2, part of the operating air is discharged from the air switch 23a to the outside, and the air pressure in the recess 24 becomes lower than the air pressure in the opening 15b', causing the rubber piece 25 to release the air pressure in the opening 15b'. The openings 1 =, a/, 15b' are both opened, and working air is sent from the second supply passage 15b to the first supply passage 15a, and this working air flows into the recess 61b of the lower cover 6b. Then, the diaphragm 7 is expanded toward the recess 61a of the upper lid 6a.

As a result, the valve body 5 is lifted upward against the suction air pressure, and the valve seat opening 4a opens to suck saliva or the like from the suction tool.

At this time, a part of the working air supplied into the recess 61b leaks from the gap between the valve shaft 8 and the hole 9, and this air flow is transferred to the valve body 5.
Since the flow surrounds the periphery of the valve body 5, saliva and the like sucked from the suction passage are blocked by this air flow and flow into the suction passage 2 without adhering to the valve body 5.

When the use of the suction tool is finished, close the air switch 23a.

Then, as shown in FIG.
and 15b', and the lower cover 6b is closed from the first supply passage 15a.
Operating air is not supplied into the recess 61b, the diaphragm 7 is restored by its own elasticity and the elastic force of the coil spring 14, and the valve body 5 is moved to the valve seat opening 4a by suction air pressure.
Close.

Note that the air switch 23a may be configured to work in conjunction with a banger that suspends the suction tool.

That is, the air switch 23a may be opened when the suction tool is removed from the banger, and the air switch 23a may be closed when the suction tool is suspended from the banger.

[Effect of idea]

As explained above, according to this invention, only when the suction tool is used, operating air is supplied into the diaphragm case to apply pressure to the diaphragm, and the valve body connected to the diaphragm is moved to seat the valve. When the suction device is not in use, the valve body is suctioned by suction air pressure from the suction pump and the valve seat is closed, without applying any pressure to the diaphragm. When using
By preventing any deformation of the diaphragm, its premature deterioration can be avoided, thereby ensuring reliable valve operation over a long period of time.

[Brief explanation of the drawing]

The drawings show an embodiment of this invention, with FIG. 1 being a sectional view when not in use, and FIG. 2 being a sectional view when in use. 1... Valve box, 2... Suction passage, 3...
...Suction passage, 4...Valve seat, 5...
・Valve body, 6...Diaphragm case, 7...
...Diaphragm, 8...Valve shaft, 4a...
...Valve seat mouth.

Claims (1)

[Scope of utility model registration request] The valve box is provided with a suction passage that communicates with the inner chamber of the valve box and is connected to the suction source side, and a suction passage that communicates with the inner chamber of the valve box and is connected to the suction hose side. A valve body is provided in the valve box, the valve seat opening being the opening of the suction passage in the box, a diaphragm case is attached to the outside of the valve box, and the diaphragm case is provided with a diaphragm that divides the interior into two chambers, These diaphragms are arranged such that the valve body closes the suction passage when the diaphragm is in its undeformed configuration and opens the suction passage when the diaphragm is deformed into a chamber on one side within the diaphragm case. and a valve body are connected to each other by a valve shaft, and a passage is formed in the diaphragm case to guide working air that deforms the diaphragm into a chamber on one side within the diaphragm case into a chamber on the other side within the diaphragm case. A diaphragm valve characterized by: