JPS6233186Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a sound muffling device in which the cylindrical sound muffling body is easy to attach and detach, is vertical, can withstand long-term use, and is extremely convenient to use. .

Conventional technology Conventionally, there are high-pressure air generators used in dental treatment equipment or high-pressure air generators used in pesticide sprayers, etc., as shown in Fig. 4. An air supply device 30 for sending air for use in dental treatment is installed in a dental treatment chair, and air is inflowed through an air inlet 31 attached to the air supply device 30 and air is outflowed from the air supply device 30. Dental treatment is performed by forcibly sending out high-pressure air from the connecting pipe 32, and it is generally known that a sound deadening material is attached to the air inlet that generates noise as the air flows in. It is.

Problems to be Solved by the Invention However, when the air supply device 30 is operated, noise is generated due to the rotation of a rotor blade (not shown) installed in the air supply device 30 for making air into high pressure and sending it to the air outflow pipe 32. There are disadvantages such as leaking outside from the air inlet 31 which has a wide opening area and making the treatment room noisy.Also, if a sound deadening material is attached to the air inlet which generates noise as air flows in, it is recommended to install sound deadening material. It is troublesome and cannot be easily attached or detached, and it also requires a complicated device to prevent it from coming off due to vibration. This invention is intended to solve the above-mentioned problems and to provide a muffling device that is convenient to use.

Means for solving the problem In order to achieve the above purpose, the structure of this invention is as follows.
A cylindrical body 6 is provided with an opening 4 at the right end and a closing plate 5 integrally connected to the left end, and a cylindrical sound damping body 8 having a hollow chamber 7 formed inside has numerous continuous porous portions 9. A cylindrical sound deadening body 8 made of porous synthetic resin.
The metal nut-shaped body 14 is located slightly to the left of the right opening end surface 10 of the opening, the screwing surface 11 is exposed slightly protruding from the opening inner wall surface 12, and a metal nut-shaped body 14 having a polygonal outer circumferential surface 13 is buried therein. The right part 15 of the cylindrical muffler 8 in which the nut-shaped body 14 made of
Furthermore, the screwing surface 11 is screwed onto the screwing portion 17 of the air inflow pipe 2, and the opening inner wall surface 1 is made harder.
The inner diameter of the air inlet tube 2 is larger than the inner diameter of the inner wall surface 18 of the cylinder 6 via the annular step surface 19, and the tip edge 20 of the air inflow tube 2 is closely crimped to the annular step surface 19.

Embodiment An embodiment of this invention will be described below with reference to the drawings. Reference numeral 3 denotes an air supply device which is a source of high-pressure air and is equipped with an air outflow pipe 1 on one side and an air inflow pipe 2 on the other side. A porous body comprising a cylindrical body 6 having an opening 4 and a closing plate 5 integrally connected to the left end, a cylindrical sound damping body 8 having a hollow chamber 7 formed therein, and numerous continuous porous portions 9. Made of synthetic resin,
In addition, a metal nut-shaped body 14 is located slightly to the left of the right opening end face 10 of the cylindrical sound muffling body 8, and has a screwing surface 11 slightly protruding and exposed from the opening inner wall face 12, and has a polygonal outer circumferential surface 13. The right part 15 of the cylindrical sound deadening body 8 in which the metal nut-shaped body 14 is buried is made harder than the left part 16, and the threaded surface 11 is made to be the threaded part of the air inflow pipe 2. The porous synthetic resin forming the cylindrical sound muffler 8 is made of a material such as polyethylene, polypropylene, nylon, vinyl chloride, or acrylic. Part 15 to left part 16
A harder material can be formed by varying the heating temperature of the mold during molding.

Further, the inner diameter of the opening inner wall surface 12 is made larger than the inner diameter of the inner inner wall surface 18 of the cylindrical body 6 via the annular step surface 19,
When screwing onto the air inflow pipe 2, the tip edge 20 of the air inflow pipe is closely pressed against the annular stepped surface 19.

Furthermore, by forming the air outflow pipe 1 long, noise leakage from the tip of the air outflow pipe 1 can be prevented.

Effects of the invention This invention has the above-mentioned configuration, and includes a cylindrical body 6 having an opening 4 at the right end, a closing plate 5 integrally connected to the left end, and a hollow chamber 7 formed inside. Since the cylindrical muffler 8 is made of a porous synthetic resin having countless continuous pores 9, air can flow into the air supply device 3 from the entire surface of the cylindrical muffler 8. The main uses include silencing high-pressure air generators in dental treatment instruments used for dental treatment, and silencing high-pressure air generators in pesticide sprayers used for spraying agricultural chemicals. By forming the entire air supply device 8 from a porous synthetic resin having countless continuous pores 9, the noise generated inside the air supply device 3 is prevented from leaking to the outside through the air inlet pipe 2. Furthermore, it has excellent water resistance, corrosion resistance, and durability, and can also be easily made chemical and heat resistant.Furthermore, it has a large air circulation area and can smoothly flow in air to generate high-pressure air. In addition, the right opening end surface 10 of the cylindrical muffler 8
A cylinder located slightly inside on the left side, in which the screwing surface 11 is exposed to the opening inner wall surface 12 and a metal nut-shaped body 14 having a polygonal outer circumferential surface 13 is buried, and the nut-shaped body 14 is buried therein. The right part 15 of the shaped sound absorber 8 is made harder than the left part 16, and the screwing surface 11 is made harder than the left part 16.
is screwed onto the threaded part 17 of the air inflow pipe 2, so it is easy to attach and detach from the air inflow pipe 2, and it is economical because it can be washed, and the cylindrical sound damper has a metal nut-shaped body 14 embedded therein. By making the right part 15 of 8 harder than the left part 16, the right part 1 is made harder than the left part 16.
Although the formation condition of the countless continuous porous portions 9 in 5 becomes worse, the fact that the metal nut-shaped body 14 is buried as the polygonal outer circumferential surface 13 also causes the formation of the metal nut-shaped body 14.
The cylindrical sound muffler is firmly embedded so that it will not rotate and become unusable when attached to or removed from the air inflow pipe 2, and can be attached and detached over a long period of time by screwing into the air inflow pipe 2. Even if the inside of the cylinder 6 is washed frequently, the threaded state does not deteriorate, making it extremely suitable for use.
The diameter is larger than the inner diameter of the inner inner wall surface 18 of the air inflow tube 2 through the annular stepped surface 19, and the tip edge 20 of the air inflow tube 2 is closely crimped to the annular stepped surface 19 when screwed onto the air inflow tube 2. The threading between the threaded surface 11 and the threaded part 17 is firmly tightened, and the loosening of the cylindrical muffler 8 due to vibrations caused by the operation of the air supply device 3 is prevented for a long period of time, thereby preventing accidental separation during use. Furthermore, the airtight state of the threaded portion 17 can be maintained for a long period of time, and a reliable sound muffling effect can be performed.

Furthermore, it has a simple structure, is suitable for mass production, and can be provided at low cost, and has many practical effects.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway side view, Fig. 2 is a sectional view of the main part, Fig. 3 is a sectional view taken along line A-A in Fig. 2, and Fig. 4 is a sectional view taken along line A-A in Fig. 2.
The figure is an explanatory diagram of a conventional example. 1...Air outflow pipe, 2...Air inflow pipe, 3...
... Air supply device, 4 ... Opening, 5 ... Closing plate, 6 ... Cylindrical body, 7 ... Hollow chamber, 8 ... Cylindrical sound deadening body, 9 ... Continuous porous part, 10 ... Right opening End face, 1
DESCRIPTION OF SYMBOLS 1... Screwing surface, 12... Opening inner wall, 13... Polygonal outer peripheral surface, 14... Nut-shaped body, 15... Right part, 16... Left part, 17... Screwing part, 18 ……
Inner inner surface wall, 19... annular stepped surface, 20... tip edge.

Claims (1)

[Scope of utility model registration request] A cylindrical body 6 is provided with an opening 4 at the right end and a closing plate 5 integrally connected to the left end, and a cylindrical sound damping body 8 having a hollow chamber 7 formed inside has numerous continuous porous portions 9. It is formed of a porous synthetic resin and is located slightly inside to the left of the right opening end surface 10 of the cylindrical sound deadening body 8,
The screwing surface 11 is exposed slightly protruding from the opening inner wall surface 12, and a metal nut-shaped body 14 having a polygonal outer circumferential surface 13 is embedded, and the metal nut-shaped body 14
The right part 15 of the cylindrical sound deadening body 8 in which is buried is the left part 1
Furthermore, the threaded surface 11 is threaded onto the threaded portion 17 of the air inflow pipe 2, and the inner diameter of the opening inner wall surface 12 is set to be harder than the inner diameter of the inner inner wall surface 18 of the cylindrical body 6. A sound muffling device in which the tip edge 20 of the air inflow pipe 2 is closely crimped to the annular stepped surface 19 with a large diameter through the air inflow pipe 2.