Pneumatic dust removing device

 

(57) Abstract:

The inventive pneumatic dust removing device includes a compressed air pistol part, forming a handle, provided with a trigger mechanism for supplying compressed air, and nozzle. It has a built in oscillating valve forming a pulsating flow with the repetitive pressure pulses and is made in the form of a saddle valve with elongated body can move in the longitudinal direction, one end of which is in tight contact with the valve seat under the influence of the compression spring, and the other end is made in the form of a movable piston located in a closed cylinder. One end of the valve that goes in the opposite direction from the saddle, connected to the duct for saddle valve through the inner channel, passing through the elongated body of the valve and its opposite end connected to the discharge area in front of the seat located in front of the saddle valve through the interior of the valve cylinder. 7 C.p. f-crystals, 6 ill.

The present invention relates to a pneumatic dust removing device, in which the dynamic effect of vozduhoksily and for similar purposes there where dirt, dust, oil and other contaminants are removed using only compressed air or in combination with cleansing substances such as water, cleaning fluid, sand, abrasive powder etc. who served in the air stream just before it is sent to the cleaned object, in order to obtain using this additive effect of dissolving dirt and/or abrasive effect.

Use compressed air to remove dirt and to clean up is well known and widely used technology. The usual design is a device in the form of a gun with an elongated air nozzle and built-in shut-off valve, which ensures the production of concentrated and verifiable regulation of air flow.

Such devices, in particular, is known from SU N A published 07.11.84, which describes a method and apparatus for abrasive machining, as well as from GB N A "Handheld device for cleaning by compressed air", published 20.03.85.

Shut-off valve, as a rule, adjust manually. When the actuation pneumatic dust removing device from its nozzle out a concentrated stream of air that healthy lifestyles which may be loosened and removed. The flow of air to loosen dried-on dirt and firmly adhering various pollutants depends on the dynamic pressure of the flow, i.e. the flow velocity. The higher the speed, the better the cleaning action.

However, the flow rate is limited to the allowable amount of air pressure, usually equal to 6 bar, and, consequently, improving the cleaning action can be achieved only by increasing air flow. Air consumption will be particularly disproportionately large, and the purification method, therefore, uneconomical when removing a thick layer of adhering contaminants.

The main task of the present invention is the intention to improve loosening and cleansing mobile devices when deleting particularly strongly adhering contaminants and at the same time to achieve an economical consumption of compressed air. In accordance with the invention this object is achieved by creating a mobile device that is described in the characterizing part of paragraph 1 of the claims.

The principle of operation of the pulsed gate valve dust removing device is based on the fact that instead of feeding compressed is, the more precisely, it is a pulsating flow of air from the repetitive pressure pulses. The data periodically recurring pulses, for example, with a frequency of 10-20 Hz, based on the per unit time energy concentration of air pressure so that the peak value of the air pressure in the individual pulses is increased compared with the value of dynamic pressure, which could be obtained if through the nozzle continuously ejected for the same volume of air. As already mentioned, the value of the dynamic pressure of the airflow determines the ability of the air to loosen adhering contaminants.

In addition to the higher dynamic pressure pulsating air flow also has the unexpected property to force polluters to vibrate under the influence of air pulses. For example, certain types of pollutants was practically shown that this action is highly contributes to the cleansing action of the mobile device, because the vibration helps loosening substances, resulting cleanup is much faster, more thoroughly and with more efficient consumption of compressed who is really be able to replace traditional methods high pressure cleaning (cleaning flow based on water) retaining the inherent advantages, both in terms of their efficiency and harmlessness to the environment.

The principle of operation of the pulsed shut-off valve is as follows. In the original, closed/sealed position of the valve body tightly held in the saddle by means of a spring. After beginning to receive compressed air (as a result of actuation of the trigger device), the pressure on one side of the piston increases. The pressure exceeds the spring force and the valve opens, resulting in the simultaneous ejection of the compressed air and the pressure drop. After this, the valve is closed again and the whole cycle repeats. The pulse lasts as long as the compressed air enters the valve, i.e., up until valid trigger. The valve, therefore, alternately opens and closes the air passage through the mobile device under static and dynamic pressure of compressed air.

The pulsating action of the valve body assumes the existence of a corresponding relationship between the size of the valve, the weight of the valve body (moving mass) and power characteristics of the spring. pulses depends on these factors, combined with the pressure of compressed air.

In accordance with the invention the seal of the piston can be carried out according to as described in paragraphs 2 and 3 of the claims.

With this design of the sealing device meets the requirements of the free movement of the valve with low friction. It is reasonable to provide the valve seat or the valve body elastic rubber coated, charged in paragraph 4, serving to reduce noise and extend service life of the valve.

The stated mobile device, like any conventional pneumatic dust removing device, used in combination with an ejector for supplying liquid or granular material together with air (see paragraph 5 of the claims). The combination of pulsating compressed air and an additive comprising a substance for cleaning or dissolution, provides a significant increase in the cleansing action. This technology is used in special cases when we have this increased efficiency.

Hereinafter the invention will be further explained with reference to the drawings, where Fig. 1 shows a side view of a pneumatic dust removing device in accordance with the invention; Fig. 2 is an enlarged view in section of a corresponding shut-off valve dust removing device; in Fig. 4 - nozzle ejector designed for use with the addition of liquid simultaneously with the compressed air; Fig. 5 is similar to the nozzle of the ejector designed for sandblasting; Fig. 6 is a combined injection and mixing valve with connections for simultaneous supply of air and two different liquids.

In the embodiment shown in Fig. 1, mobile device consists of a handle 1 (pistol type) with the trigger lever 2 and the safety bracket 3, a sliding cylinder 4 and the interchangeable nozzle pipe 5, which is equipped with a replaceable nozzle tip 6. The latter is shown separately in Fig. 2. The handle 1 includes a not shown locking the valve is opened by a trigger lever 2, and a pulsating discharge valve. The discharge valve is built into the part of the arm, denoted by 1a. Air supply to the mobile device passes through the rod coupling 7. Pipe 5 nozzle mounted on the handle 1 through the rolling nut fitting 8.

In Fig. 3 shows a separate view in the context of pulsed injection valve. The main element of the injection valve is saddle valve seat which is indicated by the numeral 9, and the body in the feces. One end of the valve body forms a conical sealing disc 11 is tightly seated in the saddle 9. The cone-shaped element 11 is equipped with vulcanized thereto a rubber coating 11a. The opposite end of the valve body 10 is a piston 12, is inserted into the cylinder 13. Between the piston 12 and the cone-shaped element 11 of the valve body is an elongated cylindrical rod 14.

Denoted in the drawing by the numeral 15 internal channel in the valve body connects the rear section 13a of the cylinder 13 with the duct 16 for saddle valve, i.e., with retractable cylinder 4 and the pipe 5 of the nozzle. The valve body is pressed against the saddle with a cylindrical compression spring 17 placed in the cylinder 13 for the piston 12.

The opposite end 13b of the cylinder through an eccentrically located bore 18 is connected with an air chamber 19 located directly in front of the saddle valve with its inlet side. The direction of flow through the valve, shown by arrows 20.

The piston 12 of the valve planted sealing ring of low friction, consisting of a Teflon disk 21 and the rubber sealing ring 22. Rubber Plotnichenko ensures the sealing of the piston.

Dimensions valve size and weight of the valve body, the characteristics of the spring, the area of the orifice of the duct, etc. are selected from the conditions for obtaining the most pronounced effect of the pulsations that occur automatically immediately after open admission of air flow (as a result of actuation of the trigger lever 2). Explanation of the ripple effect has been given previously and will not be repeated here. During the pulsation of the valve body passage of compressed air through the fifth valve is opened and closed, which creates pulses of compressed air with cyclically recurring pulse pressure. The impact of pulse pressure is transmitted from the saddle valve 9,11 and then through the sliding cylinder 4, the pipe 5 nozzle 6 to its tip.

By replacing the pipe 5 nozzle 6 mobile device can be equipped with different ejectors of the type shown in Fig. 4,5 and 6. In Fig. 4 shows a combined injection and mixing valve for fluids. The liquid fed through the hose 23. Pipe 5 nozzle 6 mobile device indicated by the numeral 24. Shut-off valve that is part of the injection and mixing valve cuts off the supply of fluid under pressure gigastore also serve as an ejector, i.e., by gravity feed fluid. In this case, the liquid is sucked into the ejector from a not shown tank or container through the usual ejector effect, when through the ejector serves compressed air.

The amount of liquid can be adjusted using a control valve flow rate is located on the intake opening of the nozzle of the ejector as in the case of the valve-mixer, and the valve-ejector. Adjustment valve flow performed by means of nut - lamb 23a.

In Fig. 5 shows an ejector used in sand-blasting. Sand through the tubular lance 25 is sucked into the nozzle due to the electronic effect. By adjusting the suction of air through the suction hose (the so-called "fugitive air"), the flow quantity of sand may be adjusted in accordance with specific requirements. The adjustment is carried out using the valve flow rate 25a embedded in the upper part of the sand peaks.

In Fig. 6 shows the injector-mixing valve 26, which in addition to pipe compressed air 27 is equipped with two additional holes 28 and 29 for mixing water and liquid chemicals, respectively. Construction of field works, requiring disinfection or cleaning of grease.

The mixing valve can be used in the following combinations:

1) only air (both inlet for liquid plugged or otherwise muted),

2) air + adjustable volume of water,

3) air + adjustable volume of water + adjustable volume chemicals,

4) air + adjustable volume chemicals

5) air + water-soluble chemicals + adjustable concentration of chemicals,

6) air drying after cleaning with water/chemicals.

The invention is not limited to the above shown and explained options for implementation. There may be other types of pulsating injection valves. The original idea of the invention is to transform the static energy of compressed air into a pulsating concentrated air flow, the individual pressure pulses which have a large dynamic energy.

1. Pneumatic dust-collecting device, comprising a compressed air pistol part, forming a handle, provided with a trigger mechanism for supplying compressed air and a nozzle, characterized in that it has a built in oscillating valve, formirova valve with elongated body can move in the longitudinal direction, one end of which is in tight contact with the valve seat under the influence of a compression spring, and the other end is made in the form of a movable piston located in a closed cylinder, with one end facing in the opposite direction from the saddle, connected to the duct for saddle valve through the inner channel, passing through the elongated body of the valve and its opposite end connected to the discharge area in front of the seat located in front of the saddle valve through the inner channel of the cylinder.

2. The device under item 1, characterized in that the frequency of the pulsating flow is in the range of 2 to 50 Hz.

3. The device under item 1, characterized in that the movable piston forming one end of an elongated valve body, provided with a sealing ring with a low friction coefficient and high qualities slip, made for example of Teflon or similar material.

4. The device according to p. 3, characterized in that the sealing ring is made of Teflon disk, based on the rubber o-ring located in the annular groove of the piston.

5. The device under item 1, characterized in that the end part adonline polyurethane, synthetic rubber or similar wear-resistant elastic material.

6. The device under item 1, characterized in that the pulsating valve built into the pistol part, and attached to the nozzle ejectors feed cleaning fluid, water, sand or other mixtures into a pulsating stream of compressed air.

7. The device under item 1, characterized in that attached to the nozzle ejectors feed cleaning fluid, water, sand or other mixtures into a pulsating stream of compressed air.

8. The device according to p. 7, wherein the ejectors are equipped with built-in shut-off valves.

 

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