DE2832525A1 - GAS COMPRESSOR - Google Patents

Description

The invention relates to an improved gas compressor design with a umwäl ζ system that connects the outlet of the compressor connects to the inlet and a heat exchanger contains.

As a result of the recent shortage of natural gas, in many parts of the country supplies to industrial and commercial businesses have been cut so that fuel supply is not necessary. There are already LPG, d »h · propane systems have been used as replacement units, and since natural gas and propane differ in their composition, the propane gas must be mixed with air before it is fed into the burner. Correct setting of the Propane-air ratio, the gas mixture can be burned in a natural gas burner without modifying the burner «In In a carburetor system, propane and air are mixed in the carburetor and the gas mixture is fed into the suction side of a compressor sucked in, continuously supplying the gas to the burner works at the desired pressure. Compressors such as those used in Vex 'gas systems are usually provided with a circulation channel, so that the gas mixture from the outlet of the low demand during operation Compressor is circulated to the inlet. Circulation compressors are also used to boost pressure in telescopic pipelines, in which there is a significant pressure drop, as well as for pressurization in cases where the pressure of the gas supply is not sufficient to meet the pressure requirements of the process

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system to satisfy, boi pressure booster equipment becomes a Part of the gas during the operating times with low demand circulated.

The circulation of all or a substantial part of the gas causes a build-up of heat in the compressor, the can cause the bearing seals to break, which then Leakage or deformation of the blades.

In the improved gas compressor construction according to the invention with a circulation system which connects the outlet of the compressor with the inlet, and which has one "heat exhaust". contains exchangers, the flow is through the circulation system by a pressure sensitive valve _s controlled and when the demand is reduced, a part is recirculated the gas and cooled by the heat exchanger during its passage, to thereby prevent temperature build-up in the compressor during the BetriebszQiten, when substantially all of the gas is circulated.

The compressor according to the invention creates a constant gas supply at the desired pressure and permeation in a gas mixing system, the correct gas-air ratio even at extremely low flow rates. upright.

Since the circulated gas passes through a heat exchanger

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is performed, there is a build-up of heat in the compressor itself switched off during operating times when there is no demand, so that the entire gas flow through the circulation system leads through. By switching off the heat build-up in the compressor, the service life of the compressor is improved in operation, because a break, the bearing seal on as well Deformation of the blades at high temperatures is eliminated. Further advantages and features of the invention emerge from the following description.

The drawings show the best mode presently contemplated for carrying out the invention. Show it;

Fig. 1 is a perspective view of the device according to the invention,

2 shows a vertical section through the compressor, FIG. 3 shows a section along line 3-3 in FIG. 2, and FIG. K shows a section along line kk in FIG. 2.

The drawings show the gas compressor according to the invention when embodied in a system for mixing two gases, such as propane and air. The plant contains a Carburetor 1 with a gas inlet line 2 and an air inlet line 3 «The gas and the air are in the carburetor mixed together, generally in a ratio of

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about 55 $ propane and 45 $ air _o The gas mixture produced is discharged from the carburettor through an outlet line h , which is connected to the inlet or the suction side of a compressor 5 _a

As best seen in Figures 2 and 3, the compressor 5 includes an outer casing or housing with a gas inlet 7 'which is connected to the conduit k and an outlet 8' which is passed through a conduit or pipe (not shown ) with a burner or another. Processing device are connected

The housing 6 delimits a central chamber 9? and in the chamber 9 a rotor 10 is arranged eccentrically to the circulation in the chamber. A row of blades 11 is mounted for sliding movement in slots 12 in the rotor., ■ and the outer tips of the blades are in position ₃ in contact with to move the inner wall of the housing ,, while the rotor rotates _s thereby the gas mixture within the chamber to compress ,.

The rotor 10 is wedged on a shaft © 13, which is mounted within the bearing fixtures Ik and 15, which in turn are mounted in recesses in the opposite sides of the housing 6, on the Ivella 13 locking nuts 16 are screwed around the bearing fixtures Fiats % n

There is a spacer sleeve between the bearing assembly 15 and the rotor 17 arranged, which is effective in the form that it the inner space between the side of the rotor and the inner wall of the housing 6!

The bearing assembly 14 is enclosed by a cap 18, while on the opposite side of the housing the 'shaft'13 extends through an opening in the cap 19 and is sealed by gaskets 20 on the cap.

To drive the rotor 10, a belt pulley 21 is attached to the outer end of a shaft 13 and connected via a belt 22 to the drive shaft 23 of the motor 24, which is mounted below the housing 6. In this construction, the operation of the motor 2k serves to drive the compressor 5 and thereby compress the propane-air mixture within the chamber 9 «

The baffle 25 is arranged at the outlet end of the chamber 9 and serves to direct the compressed gas mixture in the direction of the outlet 8 without pulsation.

The compressor 5 is able to work continuously, and when the demand for fuel _{mixture is reduced 9} then part of the pulp mixture is recirculated from the outlet to the inlet 7. To enable this circulation, the housing 6 forms a chamber 25, which with the

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Outlet 8 is in communication, and the opening 27 is formed in the inner wall of the housing, which is in pre- connection with the chamber Z6 _e ¥ ie best seen in Fig. 2, a piston valve 28 is arranged in the opening 27 for performing a sliding movement, and the lower end of the piston is provided with a central bore 29 and a series of radial channels 30, which are connected to the central bore »

With the opening 27, a channel 31 is in communication, and the spool valve 28 serves to direct the flow of the gas mixture between the chamber 26 and the channel 31 ZXL steuerno

The valve 28 is actuated by a diaphragm device _9, "as shown in Figo 2, the piston valve 28 is also the Off" guiding a sliding movement in the opening 32 arranged ,, which is formed in the outer wall of the housing and aligned with the aperture 27 ₀ In A retaining ring or a stop 33 is mounted in a groove of the valve 28 and the interaction of the ring 33 with the outside of the housing forms a stop to limit the downward movement of the valve 28

Movement of the valve 28 is controlled by a diaphragm Jk, which is connected to dam the upper end of the valve by the screw 35 shown © _o ¥ © in Fig 1 _o 2 ;, is the outer edge © © ^ of the diaphragm 3 to the annular Flange 3 ^ the housing 2 sealed by a ring 37 and screws 38 in the middle over

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the membrane 3 ^ a weight 39 is arranged, which is used to push the membrane 34 and the valve into the lowest position. The upper side of diaphragm 34 is exposed to atmospheric pressure, while the underside of the membrane through the channel 40 and the constricted opening 4i the print is exposed within the chamber 2.6 _o In this construction, a pressure differential has on the side opposite to "sides of the membrane, the inclination to bend the diaphragm upward to a position where the openings 30 in the valve 28 communicate with the circulation channel 31, so that the gas mixture then flows from the chamber 26 through the valve 28 to the circulation channel 31 and then to the inlet 7j "as in FIG Connection to this is to be described. During periods of operation with high demand, the pressure difference decreases and causes the valve 28 to lower and close so that the gas mixture is discharged directly through the outlet 8 without circulation,

A protective cap 42 interacts with the ring 37 and serves to accommodate the membrane 3h and the weight 39.

According to the invention, a generally semicircular guide plate is brought across the circulation channel 31 ± n position _s ■ w & d the upper end © of the guide plate © 43 is in the opening of the G © MiiäB <awaa.d h. ± n® ± n before _o Xu ύ®τ & ££ nwag 44 is a line 4 xrle ± n PsIg ₀ 1 ges®igi _{0 over} a © L © ittmg

connected to the olner manifold 47 of the heat exchanger 48. The heat exchanger 48 includes a number of generally parallel ones Tubes 49 with heat transfer fins 50 · One end of each tube 49 is connected to the manifold 47, while the opposite ends of the tubes are connected to the manifold 51, which via the line 52 to the inlet 7 is connected. With this construction, when the pressure in the chamber 26 increases, the pressure difference bends the membrane 34 through to open the valve 28 ^ and that Gas mixture flows into line 31, where the gas mixture is deflected by the baffle 44 into the line 45 into it. The gas mixture then flows through the heat exchanger, in order to thereby cool the gas mixture before it is reintroduced into the inlet 7.

To increase the rate of heat transfer it is A fan 53 is connected to the drive shaft 23 of the motor 24 and immediately behind the heat exchanger tubes 49 arranged. The fan is effective in the form that it directs Lui't over the heat exchanger fins 50 to thereby increasing the rate of heat transfer from the gas mixture to the atmosphere.

As shown in FIG. 2 ₉ , the housing can also be provided with a lubricant channel 54, and a lubricant reservoir 55 is mounted on the outside of the housing and is connected to the channel 54 by a line 6.

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will give to thereby, the blades of the compressor to Lubricate · In the Konipressorkonstruction according to the invention, the entire volume of the propane-air mixture are circulated in the compressor for extended periods of time without heat build-up, and this increases the life of the compressor is considerably enlarged during operation,

The invention is particularly useful as LPG. Reserve system, in which the demand at certain times can be minimal or equal to zero. For example, it can be used in certain industrial or commercial facilities the demand for the gas mixture during the night or on weekends when the process plant is not in operation very little during these times, for example only a supply of the economy burner may be required, so that essentially the entire gas mixture is circulated through the compressor. Similarly, in other installations, which is a process plant with an "on-off" cycle use, the need can vary greatly. In any case, the system according to the invention is able to handle the fluctuations by circulating substantial parts or all of the gas without excessive heating of the compressor deal with.

While the compressor is shown in the drawings in connection with a gas mixing system, it is contemplated that the compressor could be used in other systems where recirculation of the gas is required with reduced demand . 909808/07 * 0

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Claims (1)

\ 1 οJGaskoHiprQssorkonstruktion, characterized by, a housing (6) with an inlet (7) for receiving a gas and with an outlet (8) for delivering the gas, circulating devices (10) which are arranged inside the housing to compress the gas , By-pass lines (27 _t 31, 45, k6 _t 47, 49, 51, 52) for connecting the outlet with the inlet for circulating the gas from the outlet to the inlet, and heat exchanger devices (48) connected to the by -pass-Leltuiig are connected to cool the gas and thereby prevent the compressor from overheating, OWQJNAL INSPECTEO 909808/0740. "./ ₂ 2 "Device according to claim 1 _9, characterized by pressure-sensitive valve devices (28) which are arranged in the by-pass line in order to open and close the by-pass line as a function of pressure fluctuations at the outlet, β apparatus of claim 1 _S gekenuseich.net characterized "in that the ¥ ärmoaustauschereinrichtung a number Wärmeübertragungseinlxeiten (50) _s and means (53) for Across performing a värmeübertragoxiden fluid on units sur increase in the VELOCITY" of the heat transfer lceit from the gas to the fluid , 4. Device according to claim 3 »characterized _s that the latter means (53) ei ^ fan and the air flow means is ₀ 5ο Vorz'ichtung according to claim k $ characterized by a drive device ^ which is to operate ^. ^ B both with the rotating device and with the fan vsr = bound, 6 "Device for mixing a flammable gas and air, characterized by a gasifier (i) sum mixing the flammable gas" and the air with aisiera outlet toi-delivery of the gas mixture ^ a compressor (5) ^with one S09808 / 0740 ° / 3 Inlet (7) "<i" r connected to the outlet (8) of the carburetor is to bring the gas mixture to the compressor, and with an outlet for discharging the gas mixture to a burner, revolving facilities (1O), the are arranged inside the compressor for compressing the gas mixture, by-pass lines (27, 31 » 45, 46, 47, 49, 51, 52), which is the outlet of the compressor with the inlet for returning the mixture to the inlet, pressure sensitive valve means (28) in the by-pass line for opening and closing the by-pass line, which are actuated to open the by-pass line for a given increase in pressure at the outlet can, as well as heat exchange devices (48), which are used to cool the gas mixture as it is circulated in the bypass line are connected to this bypass line, prevent the build-up of warmth in the compressor « 7. Apparatus according to claim 6, characterized in that the by-pass line contains an inner channel (27, 31), which is arranged within the housing and with the outlet is connected, while an external line (45, 46, 47, 49, 51, 52) connects the channel and the inlet. 8 »Device according to claim 7, characterized in that the valve device (28) is arranged within the inner channel (27, 31) and the heat exchange device (41) in the outer line (45, 46, 47 _P 49, 51” 52) lies. Apparatus according to claim. _6-9, characterized in that the pressure-sensitive valve device contains a slide valve (28, 34) actuated by a membrane Device according to claim 8 _{S s} in by a baffle ( '+3) ₉ which is located in your channel and is arranged so that it hinsini'iüirt the gas mixture from the channel in the outer conduit " ./5