RU2804204C1 - Device for producing two-component gas mixtures - Google Patents

Abstract

FIELD: gas equipment.

SUBSTANCE: invention relates to devices for producing gas mixtures. The invention can be used to produce gas mixtures used in mechanical engineering, medicine and other areas of industry. A device for producing two-component gas mixtures comprises mechanisms for reducing gas pressure, a gas pressure equalizer, a gas ratio regulator in the gas mixture, and a gas mixture flow regulator located in one housing. The gas pressure equalizer includes three cavities separated by two sealed elastic elements and reducing valves interacting with them, ensuring gas flow into the corresponding non-adjacent cavity of the gas pressure equalizer from the corresponding low-pressure cavity of the reducing mechanism. The central master cavity of the gas pressure equalizer adjacent to the other two cavities of the gas pressure equalizer is connected to the low-pressure cavity of the master gas pressure reducing mechanism.

EFFECT: increased accuracy of maintaining the pressure of the gas mixture at the outlet, increased safety of operation of the device.

9 cl, 3 dwg

Description

The invention relates to gas equipment, namely to devices for producing gas mixtures. The invention can be used to obtain gas mixtures used in mechanical engineering, medicine and other areas of industry.

A device is known for producing a two-component gas mixture (see patent US5544674A dated July 14, 1995), which includes two chambers connected to gas sources and a third chamber connected to them, in which gases are mixed. The flow of gases from the first and second chambers into the mixing chamber is controlled by a cam-valve system with a complex geometry of the surface of the valves and cams. Thus, this device is mechanically complex; in addition, the device does not provide mechanisms for reducing and equalizing the pressure of incoming gases, which can lead to unstable operation of the device when input pressures fluctuate.

A device is known for producing a two-component gas mixture (see patent DE3326696A1 dated December 7, 1982), which contains built-in gas pressure regulators combined with a mechanism mixing gas components, including sealed elastic elements, between which there is a valve that regulates the flow of gases into the central mixing cavity gases due to the presence of two conical surfaces on its central part. The combination of several functional units requires increased manufacturing precision, which affects the final cost of the device, as well as an increase in the cost of its maintenance.

The closest technical solution is the known device for producing a two-component gas mixture described in patent US3727627, publ. 04/17/1973, containing a device for equalizing gas pressure in the form of a two-stage system, valves regulating gas flows, a gas mixing device with manual adjustment and a system of channels connecting the listed elements.

The main disadvantages of the known device are:

- the absence in the design of mechanisms for reducing the pressure of incoming gases, which will require the use of gas reducers as separate external devices, as well as their settings;

- inability to adjust the pressure of the gas mixture at the outlet of the device;

- inability to adjust the gas flow at the outlet of the device.

The problems solved by the invention are the creation of a compact universal device for mixing two different gases with increased accuracy of maintaining the pressure of the gas mixture at the outlet, devoid of the disadvantages of known solutions, as well as increasing the safety of operation of the device.

The problem is solved by creating a device for producing two-component gas mixtures, which contains gas pressure reduction mechanisms located in one housing, a gas pressure equalization device, a regulator that provides a given gas ratio in the gas mixture and a gas flow regulator, in which the gas pressure equalization device includes three cavities separated by two sealed elastic elements, each of which interacts with a valve that ensures the flow of gas into the corresponding non-adjacent cavity of the gas pressure equalization device from the corresponding low-pressure cavity of the reduction mechanism, while the central master cavity of the gas pressure equalization device is adjacent to the other two cavities of the pressure equalization device gases is connected to the low-pressure cavity of the drive gas pressure reduction mechanism.

The problem is also solved by creating a device for producing two-component gas mixtures, which contains mechanisms for reducing gas pressure located in one housing, a device for equalizing gas pressure, a regulator that provides a given ratio of gases in the gas mixture, and a gas flow regulator, in which the device for equalizing gas pressure includes three cavities separated by two sealed membranes with a thickness of 0.1 to 0.01 mm, interacting with valves installed in an opposite pattern and ensuring the flow of each of the gases into the corresponding non-adjacent cavity of the gas pressure equalization device, with the central cavity adjacent to the other two cavities, connected to the low-pressure cavity of one of the reduction mechanisms, the pressure in which sets the gas pressure at the outlet of the gas pressure equalization device.

The problem is also solved by creating a device for producing two-component gas mixtures, which contains gas pressure reduction mechanisms connected by a system of channels and located in one housing, a gas pressure equalization device, a regulator providing a given gas ratio in the gas mixture and a gas flow regulator, in which the pressure equalization device gases includes three cavities separated by two sealed membranes interacting with valves, ensuring a dosed supply of gases into the non-adjacent cavities of the gas pressure equalization device from the low-pressure cavities of the reduction mechanisms through channels, the axes of which are in the same plane, and the central cavity of the gas pressure equalization device is connected by a channel to the cavity low pressure of one of the gas reduction mechanisms.

A device for producing two-component gas mixtures, the body of which contains cavities for high and low pressure chambers of gas pressure reducing mechanisms.

A device for producing two-component gas mixtures, in the body of which there are cavities for a gas pressure equalization device, a regulator for a given gas ratio in the gas mixture and a gas flow regulator.

A device for producing two-component gas mixtures containing safety valves.

A device for producing two-component gas mixtures containing at least one gas pressure indicator.

A device for producing two-component gas mixtures, in which the housing consists of several parts.

A device for producing two-component gas mixtures containing filter elements at the inlet.

The essence of the invention is disclosed in the figures and in the description.

Fig. 1 - Diagram of a device for obtaining two-component gas mixtures;

Fig. 2 - Device for obtaining two-component gas mixtures in a vertical section;

Fig. 3 - Device for obtaining two-component gas mixtures in a horizontal section.

In fig. Figure 1 shows a schematic diagram of a device for producing two-component gas mixtures, which includes a housing 1, a mechanism for reducing the pressure of the main gas 2, a mechanism for reducing the pressure of the master gas 3, a device for equalizing gas pressure 4, a regulator providing a given ratio of gases in the gas mixture 5, a gas flow regulator 6 The mechanism for reducing the pressure of the main gas 2 and the mechanism for reducing the pressure of the master gas 3 operate on the principle of a standard gas reducer, reducing the inlet pressure to a given value and maintaining it at the outlet of the reducer. The main gas pressure reducing mechanism 2 contains a high pressure chamber 7 and a low pressure chamber 8, while the cavities of the chamber 7 and chamber 8 are formed in the housing 1. Similarly, the driving gas pressure reducing mechanism 3 contains a high pressure chamber 9 and a low pressure chamber 10, while the cavities of the chamber 9 and chamber 10 are also formed in the housing 1. The gas pressure equalization device 4 contains three working cavities separated by two sealed elastic elements, for example, elastic membranes. The first cavity 11 is formed in the housing 1 and is limited from below by a sealed membrane 12, the second cavity 13 is also formed in the housing 1 and is limited from above by a sealed membrane 14. The set pressure cavity 15 is limited by a membrane 12 and a membrane 14, located between the first cavity 11 and the second cavity 13, for which the setting pressure cavity 15 is adjacent, and accordingly the first cavity 11 and the second cavity 13 are not adjacent to each other. Low pressure chamber 8 and cavity 11 are connected by channel 16, in which a reducing valve 17 is located, interacting through a rod with membrane 12. Low pressure chamber 10 and cavity 13 are connected by channel 18, in which a reducing valve 19 is located, interacting through a rod with membrane 14. Cavity 11, via channel 20, and cavity 13, via channel 21, are connected to cavity 22 of the gas ratio regulator in the gas mixture 5, which contains a proportional valve 23. Cavity 22 of the gas ratio regulator in the gas mixture 5, via channel 24, is connected to regulator cavity 25 gas flow 6, which contains valve 26.

In fig. Figure 2 shows a vertical section of a priority version of the device for producing two-component gas mixtures. The housing 1, to improve the manufacturability of the device, is made up of three body parts: the upper part 27, the central part 28 and the lower part 29, fastened with bolts 30. In the body part 27 a high-pressure chamber 7 and a low-pressure chamber 8 of the main gas reduction mechanism 2 are formed , as well as a high-pressure chamber 9 and a low-pressure chamber 10 of the mechanism for reducing the pressure of the master gas 3, the cavity 11 of the gas pressure equalization device 4, channel 16, in which the valve 17 and channel 18 are located. To simplify the technological process of producing the housing 1, the axis of the channel 16 and channels 18 are formed in the same plane of the body part 27. In the body part 28 a set pressure cavity 15 is formed, divided into two parts, which are connected by a channel (not shown). In the body part 29, a cavity 13 of the pressure equalization device 4 is formed and there is a supply gas valve 19. The reducing valve 17 and the reducing valve 19 are located in an opposite pattern, that is, opposite each other, this arrangement makes it possible to increase the accuracy of the gas pressure equalization device 4, and also more compactly arrange all the components of the device inside the housing 1. Also, the device for producing two-component gas mixtures may contain safety valves 31 designed to protect against rupture of the membranes of the gas pressure reduction mechanisms in the event of malfunction of the valve units of the gas pressure reduction mechanisms. Indicating means 32, for example, pressure gauges, allow you to monitor the gas pressure at the inlet to the gas pressure reducing mechanisms.

Figure 3 shows a horizontal section of a priority version of the device for producing two-component gas mixtures along the body part 27. The regulator providing a given gas ratio in the gas mixture 5 includes a gas mixing cavity 22, a proportional valve 23 and an adjustment knob 33. The valve 23 has on both sides a conical surface that allows you to change the volume of each of the mixed gases entering the cavity 22. The conical surface 34 of the valve 23 regulates the volume of the main gas entering the cavity 22 through channel 20, and the conical surface 35 of the valve 23 regulates the volume of the master gas entering the cavity 22 through channel 21. The gas flow regulator 6 includes a cavity 25, a valve 26 and an adjustment knob 36. The valve 26 has a conical surface 37, which allows you to regulate the flow of the gas mixture coming from the cavity 22 using channel 24 into the cavity 25.

A device for producing two-component gas mixtures can be used to produce a gas mixture of carbon dioxide/argon (CO2/Ar) used in electric welding work and functions as follows. Sources of compressed gas are directly connected to the corresponding mechanisms for reducing the gas pressure of the device to obtain two-component gas mixtures. A gas cylinder with compressed argon with a pressure P1=150 atm can be selected as the source of the main gas, and a gas cylinder with compressed carbon dioxide with a pressure P2=70 atm can be selected as the source of the master gas. On mechanisms for reducing gas pressure, the required pressure is set using adjusting screws, and the pressure of the main gas is set higher than the pressure of the master gas by at least one atmosphere. The main gas (Ar) from the cylinder enters the high pressure chamber 7 of the main gas pressure reducing mechanism 2, passes through the reducing unit, reduces the pressure to the specified 4.5 atm, enters the low pressure chamber 8 and then through channel 16, after passing through the reducing valve 17, enters the first cavity 11 of the gas pressure equalization device 4. The master gas (CO2) from the cylinder enters the high pressure chamber 9 of the master gas reduction mechanism 3, passes through the reducing unit, reduces the pressure to a given 3 atm, enters the low pressure chamber 10 and then along channel 18, after passing through the reducing valve 19, it enters the second cavity 13 of the gas pressure equalization device 4. Also, the driving gas through channel 18 enters directly into the central cavity 15 of the gas pressure equalization device 4.

The pressure of the master gas in the central cavity 15, acting on the membrane 12, presses out the valve 17, after which the pressure in the cavity 11 changes until the pressures on the membrane 12 on both sides are equalized. Similarly, the pressure of the driving gas in the central cavity 15, acting on the membrane 14, presses out the valve 19, after which the pressure in the chamber 13 changes until the pressures on the membrane 14 on both sides are equalized. Thus, the gas pressures in non-adjacent cavities 11 and 13 are equalized and determined by the pressure value in the central cavity 15 equal to 3 atm. When the gas pressure at the inlet to the device for producing two-component gas mixtures fluctuates, the pressures in the cavities 11 and 13 of the gas pressure equalization device remain the same. Thus, the central cavity 15 performs the function of an “equalizing spring”, relative to which equal pressures P3 are established in the cavity 11 and in the cavity 13. When using membranes in the pressure equalization device 4 with a thickness ranging from 0.1 to 0.01 mm, a more stable operation of the device and more accurate pressure values at its outlet. After the gas pressure equalization device 4, the main gas through channel 20, and the master gas through channel 21 with equal pressure values enter the mixing chamber 22 of the gas ratio regulator in the gas mixture 5. Valve 23 allows you to regulate the proportion of mixed gases due to the fact that on both sides has a cone shape. On the main gas supply side, a conical surface 34 is formed on the valve, and on the master gas side, a conical surface 35 is formed on the valve. When the handle 33 is rotated, the valve 23 moves linearly, as a result of which the dimensions of the gaps between the conical surfaces of the valve 23 and the regulator seat 5 change, so in such a way that the amount of one of the gases entering the cavity increases, and the amount of the second gas entering the cavity 22 decreases. Thus, by calibrating the parameters of the conical surfaces of the valve, it is possible to obtain a mixture of gases with a precisely specified amount of each gas component at the outlet of regulator 5. From chamber 22, the gas mixture through channel 24 enters the gas flow regulator 6. Valve 26 allows you to regulate the volume of gas entering cavity 25. When handle 36 is rotated, valve 26 moves linearly, as a result of which the size of the gap between the conical surface 37 of valve 26 and the seat changes. regulator 6. From chamber 25 of gas flow regulator 6, the gas mixture goes through the outlet with pressure P3 to the consumer.

The housing of the device for producing two-component gas mixtures, which is also a housing for high and low pressure chambers of gas pressure reducing mechanisms, makes the device compact, eliminates the need to use attachments in the form of gas reducers and allows it to be connected directly to sources of compressed gas. The body of the proposed device for producing two-component gas mixtures also contains other main elements, namely the cavities of the gas pressure equalization device, the chamber for the gas ratio regulator in the gas mixture, the chamber for the gas flow regulator, as well as a channel system connecting the main functional units of the device. The gas pressure equalization device allows you to automatically maintain the required gas pressure at the outlet. The gas ratio regulator 5, due to the design of the proportional valve, allows for precise stepless adjustment of the amount of mixed gases in the gas mixture. Due to the fact that all the main components of the device are located in one housing, ease of use is increased, as well as operational safety in industrial enterprises. The device body, made up of several parts, allows you to reduce the number of manufacturing operations for the manufacture of the device, as well as gain access to all components of the device for their maintenance.

Claims (9)

1. A device for producing two-component gas mixtures, containing gas pressure reduction mechanisms located in one housing, a gas pressure equalization device, a gas ratio regulator in the gas mixture and a gas mixture flow regulator, in which the gas pressure equalization device includes three cavities separated by two sealed elastic elements and reducing valves interacting with them, ensuring the flow of gas into the corresponding non-adjacent cavity of the gas pressure equalization device from the corresponding low-pressure cavity of the reducing mechanism, while the central master cavity of the gas pressure equalization device, adjacent to the other two cavities of the gas pressure equalization device, is connected to the cavity low pressure mechanism for reducing the pressure of the master gas. 2. A device for producing two-component gas mixtures, containing gas pressure reduction mechanisms located in one housing, a gas pressure equalization device, a regulator that provides a given gas ratio in the gas mixture and a gas flow regulator, in which the gas pressure equalization device includes three cavities separated by two sealed membranes with a thickness of 0.1 to 0.01 mm, interacting with reducing valves installed in an opposite pattern and ensuring the flow of each gas into the corresponding non-adjacent cavity of the gas pressure equalization device, while the central cavity adjacent to the other two cavities is connected with a low-pressure cavity of one of the reduction mechanisms, the pressure in which sets the gas pressure at the outlet of the gas pressure equalization device. 3. A device for producing two-component gas mixtures, containing pressure-reducing mechanisms for each gas connected by a system of channels and located in one housing, a gas pressure equalization device, a regulator providing a given gas ratio in the gas mixture, and a gas flow regulator in which the equalization device gas pressure includes three cavities separated by two sealed membranes interacting with reducing valves, ensuring a dosed supply of gases into the non-adjacent cavities of the gas pressure equalization device from the low-pressure cavities of the reducing mechanisms through channels, the axes of which are in the same plane, and the central cavity of the gas pressure equalization device , adjacent to the other two cavities of the gas pressure equalization device, is connected by a channel to the low-pressure cavity of one of the gas reduction mechanisms. 4. A device for producing two-component gas mixtures according to claims 1-3, in the body of which there are cavities for high and low pressure chambers of gas pressure reducing mechanisms. 5. A device for producing two-component gas mixtures according to claims 1-3, in the body of which there are cavities for the chambers of the gas pressure equalization device, the gas ratio regulator in the gas mixture and the gas mixture flow regulator. 6. A device for producing two-component gas mixtures according to claims 1-3, characterized in that it contains safety valves. 7. A device for producing two-component gas mixtures according to claims 1-3, characterized in that it contains at least one gas pressure indicator. 8. A device for producing two-component gas mixtures according to claims 1-3, characterized in that its body consists of several parts. 9. A device for producing two-component gas mixtures according to claims 1-3, characterized in that it contains filter elements.