RU206121U1 - Silencer for pneumatic weapons - Google Patents

Abstract

The utility model relates to silencers (sound moderators) for pneumatic weapons. The essence of the utility model: a silencer for a pneumatic weapon consists of an expansion chamber and an elastic element installed inside, while the elastic element is partially installed on a sleeve extending into the expansion chamber, rigidly fixed at the outlet end of the expansion chamber coaxially with the weapon barrel. The end face of the elastic element facing the barrel is beveled, expanding towards the outlet end of the expansion chamber. The outer dimensions of the elastic element are expediently smaller than the inner dimensions of the expansion chamber. 2 c.p. f-ly, 2 dwg.

Description

Traditionally, expansion chambers (with and without baffles) are used in silencers for pneumatic weapons - see, for example, UK patent block: GB2104197A, GB2106619A, GB2156053A, GB2193562A. These design features are also used in mufflers for firearms.

It is also known to use polymer inserts in mufflers for pneumatic weapons, the main purpose of which is to exclude the possibility of using a muffler on a firearm. Polymer (thermoplastic) inserts are damaged by hot powder gases, and the muffler loses its functionality (see, for example: DE8905505U1).

The proposed utility model is the closest to structures, the reduction of the noise level in which is achieved by quickly closing the hole behind the passing bullet and isolating the expanding portions of gases in separate, relatively sealed (expansion) chambers. Bleeding occurs through leaking connections or special holes in the muffler body (see, for example: https://survival.com.ua/variantyi-konstruktsii-glushiteley-nasadok-glusheniya-zvuka-vyistrela-strelkovogo-oruzhiya/).

As a prototype, the simplest sound moderator (muffler) was chosen, which is an expansion chamber, into which an element made of spongy rubber (elastic insert) is inserted, cut along the inner diameter of the expansion chamber, with a hole in the center (https://forum.guns.ru/forummessage /30/591782.html.).

When fired, the air that follows the bullet under pressure crushes the insert, and it blocks the exit. The air from the expansion chamber is slowly vented through leaking connections in the expansion chamber. The main disadvantage of such a sound moderator is the high probability of blowing out the sponge rubber element from the expansion chamber after one or more shots. Increasing the hardness of the elastic insert material reduces the efficiency of the device.

The utility model is aimed at eliminating the above technical problem inherent in the prototype.

EFFECT: design of a muffler (sound moderator) excludes blowing out of the elastic element from the expansion chamber.

This technical problem is solved by a silencer for pneumatic weapons, consisting of an expansion chamber and installed inside an elastic element, in which, according to the proposal, the elastic element is partially installed on a sleeve extending into the expansion chamber, rigidly fixed in the outlet end of the expansion chamber coaxially with the barrel of the weapon.

It is advisable to make the outer dimensions of the elastic element smaller than the inner dimension of the expansion chamber.

It is also advisable to make the end face of the elastic element, facing the barrel, beveled, expanding towards the outlet end of the expansion chamber.

The utility model is illustrated by drawings.

FIG. 1 shows a longitudinal section of a muffler corresponding to the prototype device. Options A and Option B differ in the shape of the elastic element.

FIG. 2 shows a longitudinal section of the proposed muffler. Options A and Option B also differ in the shape of the elastic element.

The arrows in the drawings show the approximate direction of crushing of the elastic element under the influence of excess air pressure.

In the general case, the muffler consists of an expansion chamber (housing) 1, a cover 2 (the cover is adapted to be attached to an air gun; in the illustrated version, the cover can be provided with an internal thread for screwing onto the barrel of the weapon), a sleeve (mounting sleeve) 3 and an elastic element 4 The mounting sleeve 3 is rigidly fixed in the body 1. The holes in the cover 2 and the sleeve 3 are on the same axis and serve for the passage of the bullet. An elastic element 4 is mounted on the mounting sleeve 3. Preferably, the outer diameter of the elastic element 4 is smaller than the inner diameter of the housing 1. The elastic element 4 is made of an elastic elastic material (porous, spongy rubber). Installation of the elastic element 4 on the mounting sleeve can be done manually without special equipment.

When fired, the bullet passes through the hole in the cover 2, the mounting sleeve 3 and the elastic element 4. The air flow following the bullet enters the cavity of the body 1, then passes through the elastic element 4 and the mounting sleeve 3. According to Bernoulli's law, the pressure in the passage channel the cross-section of the elastic element 4 is less than in the housing 1, due to this there is a closing, collapse of the elastic element 4. The collapse of the elastic element 4 leads to a partial cut-off of the air flow following the bullet. And with a further decrease in the inner diameter of the elastic element 4, there is a gradual increase in pressure inside the housing 1, which leads to the complete locking of air in the internal volume of the housing 1. The protruding edge of the mounting sleeve 3 and the physical and mechanical properties of the material of the elastic element 4 prevent the elastic element 4 from blowing out into the outlet of the sleeve 3. Subsequently, the air from the inner cavity of the housing 1 leaves through the leaky joints, after which the elastic element 4, due to its elasticity, returns to its original state.

Obviously, the proposed muffler will also work if the external shape of the elastic element 4 is made according to the shape of the inner surface of the housing 1, as this is done in the prototype device (Fig. 1). Sleeve 3 (Fig. 2) in any case completely excludes blowing out of the elastic element 4, but the efficiency of the muffler, in particular, the speed and degree of creasing of the elastic element 4, will decrease, that is, according to Bernoulli's law, according to which the pressure in the passing flow is less than pressure outside the flow, the elastic element is compressed (in the case when the external dimensions of the elastic element are less than the internal size of the expansion chamber), and since the elastic element fills the entire internal diameter of the compression, collapse occurs with much lower efficiency. The variant with the beveled surface of the elastic element 4 (variant A in Figs. 1 and 2) is an intermediate variant.

Based on the foregoing, it follows that, to a large extent, the effectiveness of the muffler depends on the material of the elastic element 4.

As a result of the research carried out, press plate 1-20 TU 38 105867-90 or rubber technical plate (sponge) R-29 according to TU 38105121-91 was chosen as the preferred material. The indicated grades of materials of the elastic element 4 are given solely to confirm the implementation of the utility model, but not for the purpose of determining the scope of rights, since there are a large number of materials with similar physical and mechanical properties that can be used to manufacture the elastic element 4 with the achievement of the specified technical result with varying degrees of efficiency.

Claims (3)

1. Silencer for pneumatic weapons, consisting of an expansion chamber and an elastic element installed inside, characterized in that the elastic element is partially installed on a sleeve extending into the expansion chamber, rigidly fixed at the outlet end of the expansion chamber coaxially with the barrel of the weapon. 2. The muffler according to claim 1, characterized in that the end face of the elastic element facing the barrel is beveled, expanding towards the outlet end of the expansion chamber. 3. A muffler according to claim 1 or 2, characterized in that the outer dimensions of the elastic element are smaller than the inner dimensions of the expansion chamber.

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