RU2151327C1 - Compressor protection system - Google Patents

Abstract

FIELD: thermal and power equipment protection systems. SUBSTANCE: compressor coolers are connected with at least one collector at whose inlet at least one automatic valve is fitted; actuating mechanism of this valve is connected with programmer. System provides for centralized blowing of separate technological sections and pneumatic lines. EFFECT: enhanced efficiency; possibility of servicing maximum number of equipment items. 7 cl, 10 dwg

Description

 The device relates to automated systems for protecting heat-power equipment, in this case, protecting compressors from accumulation in technological areas for the production of compressed air condensate.

 A device for protection against accidents of heat and power equipment, containing a power source, a sensor of a controlled parameter connected to an electric Converter, the output contacts of which are connected to the coil of the Executive relay (AS USSR N 562034, class. H 02 H 5/04, 07/14/07 )

 A disadvantage of the known device is the inability to use for compressor protection.

 Of the known compressor protection systems, the closest is the compressor protection system (A. S. USSR N 1707258, A1, class F 04 D 27/00, 01/23/92). The system contains compressors with refrigerators and technological tanks and pneumatic compartments for compressed air, a software device, collectors, the output of which is connected to drainage lines, and check valves.

 The disadvantage is the complexity of the design and the associated reduction in the reliability of the device.

 The aim of the invention is to increase the reliability of its work by simplifying the design.

 This goal is achieved by connecting the technological sections of the compressed air production system, the main element of which is the compressor, by piping through the check valves to the manifold, the outlet of which is made in the form of a shut-off valve, the actuator of which is connected to a temporary programming device, while the sections under different pressures are associated respectively with different collectors whose inlets are not connected to each other.

 The device is illustrated by the following drawings.

 FIG. 1 is a functional diagram of a device.

 FIG. 2 - electrical diagram of the device, its software device.

 The compressor protection device comprises: a first compressor stage 1 with nozzles 2 and 3, through an intermediate cooler 4 connected to a second compressor stage 5, while the first and second compressor stages are automatically connected to the compressor drive 6, the first stage 1 has an air intake device 7, and the second stage 5 is connected by a pipe 8 to the final cooler 9. The functional diagram shows two systems for the production of compressed air, the main components of which are listed earlier. Intermediate refrigerators 4 systems pipelines 10 through the check valves 11 are connected to the collector 12, the output of which is installed an automatic valve 13 with an actuator 14.

 The output of the automatic valve 13 by a pipe 15 is connected to the sump 16 for residual oil and condensate.

 The final refrigerators 9 through pipelines 17 are connected through a non-return valve 18 to a collector 19, at the output of which an automatic valve 20 with an actuator 21 is installed.

 Actuators 14 and 21 lines 23 are connected to a temporary software device 24.

 In FIG. 2 shows an example of the execution of a temporary software device 24, which consists of a time relay 25 and a time relay 26. In series with the coils of the time relay 25, normally open temporary contacts 27 of the time relay 26 are installed, in parallel with which are block contacts 28 and temporary normally closed contacts 29 located in series with each other, time relay 25. In series with the coil of time relay 26, a normally closed contact 30 of time relay 25 is installed.

 The temporary software device includes a switch 31 and fuses 32 installed in the power circuit of the device.

 Normally open contacts 33 are connected in series with the coils of the actuators 14 and 21, in this case, the actuators 14 and 21 are electric, and the contacts 33 are the contacts of the time relay 25.

 The compressor protection device operates as follows.

 When the switch 31 is turned on through normally closed contacts 30, a time relay 26 is triggered, which has a shutter speed slightly greater than the time relay 25, which trips after a specified time and switches on the time relay 25 with its contacts 27, which becomes self-locking via its contacts 28, through its contacts 33 includes actuators 14 and 21, which open automatic valves 13 and 20, and compressed air through the lower part of the intermediate refrigerators 4 and the lower part of the final refrigerators 9, through pipelines 10 and 11 through sister valves 11 and 18, together with condensate, oil residues flow to the manifolds 12 and 19, through open automatic valves 13 and 20, through pipelines 22 and 15 to the sump 16. Thus, the technological tanks of the compressed air production system are purged. After the set time has passed, the contacts 29 open, de-energizing the coil of the time relay 25, removing it from the lock, the contacts 33 open, de-energizing the actuators 14 and 21, the automatic valves 13 and 20 are closed, the purge is stopped, the contacts 30 are closed at the same time, and the process cyclic purge The capacity of the compressed air system is repeated.

 According to this principle, other technological tanks can be purged, for example, receivers for compressed air, which are not shown in the drawing.

 Considering that the pressure of compressed air in the intermediate refrigerators 4 and the final refrigerators 9 is different, in the latter it is much higher, for safety reasons they are associated with different collectors. But in some cases, a common collector can be made with a design diameter sufficient to exclude the appearance of excess pressure in it. For the same reason, manifold 12 may be considered a low pressure manifold, and manifold 19 may be considered a high pressure manifold. Actuators can be of different operating principles, for example, electric, solenoids, pneumatic, membrane box or pneumatic cylinder with a piston, hydraulic.

 FIG. 3 is an example of a level purge control system.

 FIG. 4 is an electrical diagram of a level purge system.

 FIG. 5 - the same, with a time delay.

 FIG. 6 is an example of a collector.

 FIG. 7 - block control system.

 FIG. 8 is an example of a drainage.

 FIG. 9 is an example of a pneumatic control system.

 FIG. 10 is an example of a collector.

 The purge control system for technological tanks can also operate depending on the level of condensate in the technological tanks.

 For example, in a vessel 34, connected by impulse lines 24 to the lower and upper zones of the final refrigerator 9, and which is located at the level of the lower zone of this technological capacity, two sensors are made: a lower level sensor 36 and an upper level sensor 37, for example, electrodes of conductometric level sensors associated with electronic converters, for example, with an electronic level switch 39 connected to the lower level sensor 36, and an electronic level switch 38 connected to the upper level sensor 37.

 The contacts 40 of the lower level switch 39 and the contacts 41 of the upper level switch 38 are connected in series with the intermediate relay 42, and the contacts 43 of the lower level switch 39 are connected in series with the blocking contacts 44 of the intermediate relay 42, installed in parallel with the contacts 40 and 41. The contacts 45 are connected in series with the actuator 21, the contacts 45 are the contacts of the intermediate relay 42.

 Purge control of technological tanks can be carried out from one level switch with one sensor (Fig. 5). In this case, a time relay 46 is used, the blocking contacts 47 of which are installed in series with its temporary contacts 48, and which are connected in parallel with the contacts 40 of the level switch 39, connected in series with a time relay 46, whose contacts 49 are connected in series with the actuator 21. The collector check valves can be sequentially valves 50 and 51 are installed, the number of which is determined by the number of purge pipelines, and safety valves 5 can be installed on the manifolds 2 (Fig. 6).

 Actuators of various collectors may have different control systems. For example, the actuator 14 may be associated with a temporary software device 2, and the actuator 21 with a temporary software device 53 (Fig. 7).

 The output pipelines 15 and 22 of the individual collectors can be connected to one drain pipe 54 (Fig. 8).

 The actuator mounted at the outlet of the collector may be pneumatic. In this case, the signal from the electronic temporary device is supplied to the actuator via an electro-pneumatic transducer 55 mounted on the pneumatic tube 56 (Fig. 9).

 The vessel 34 can be directly mounted on the collector, and in this case, the collectors are located at or below the lower zone of the technological tanks (Fig. 10).

 When controlling the process of purging technological tanks by the level of condensate with two level sensors, the device works as follows: first, the accumulated condensate reaches the lower sensor 36, contact 40 and contact 43 are closed, then the condensate reaches the upper sensor 37, contact 41 is closed, the intermediate relay 42 is activated, which contacts 44 puts itself on the lock. The intermediate relay contacts 45 includes the actuator 21, the purge continues until the condensate drops below the lower sensor 36, after which the contact 43 removes the intermediate relay 42 from the lock, the actuator 21 is de-energized, the purge is stopped.

 In the second case, the level purge control when the condensate reaches the level sensor 36, the time relay 46 is activated by closing the contacts 40 and is self-locking by the contact 47 and activates the actuator 21 with its contact 49. The purge continues until the temporary contacts 48 remove the time relay 46 with a lock.

 Contact 49 opens, de-energizing the actuator 21.

 In the two previous cases, purging occurs when the condensate reaches a predetermined level in one of the process tanks. When installing the vessel 34 directly at the outlet of the collector, purging occurs of all containers according to the level in this vessel. Each of the collectors, air ducts can be purged in a similar way, i.e. if there is a need to purge a certain section of the pipeline through which air passes, it is connected via a non-return valve through a pipe to the corresponding manifold. Further, everything happens similarly to the examples in the claimed materials. When performing a purge system with various temporary software devices, purging of technological sections through various collectors may occur simultaneously. In general, technological tanks and pneumatic circuits that are intended for centralized purging can be called sections of a compressed air system.

 The dashed lines of the contacts 45 and 49 (Fig. 4 and 5) show the parallel connection to these control contacts of the similar contacts of the actuator control devices of other sections of the compressed air pneumatic system, for example, another end refrigerator.

Claims (7)

 1. A compressor protection system with refrigerators, process tanks and compressed air compressed air ducts, comprising a software device, manifolds whose outlet is connected to drain lines, and non-return valves, characterized in that the compressor refrigerators are connected to at least one collector, on the output of which is installed at least one automatic valve, the actuator of which is connected with the software device.  2. The compressor protection system according to claim 1, characterized in that the refrigerators are connected to at least one collector via check valves.  3. The compressor protection system according to claim 1, characterized in that the actuators of the automatic valves installed at the outlet of these manifolds are connected to a common control device for blowing sections of the pneumatic system.  4. The compressor protection system according to claim 1, characterized in that the actuators of the automatic valves installed at the outlet of these manifolds are connected with separate control devices for blowing sections of the pneumatic system.  5. The compressor protection system according to claim 1, characterized in that the device for purging individual sections through at least one collector comprises a temporary software control device for actuating mechanisms of automatic valves installed at the output of the collectors.  6. The compressor protection system according to claim 1, characterized in that this actuator control device is made in the form of a level switch that controls the level of condensate in the blown sections of the compressed air pneumatic system.  7. The compressor protection system according to claim 1, characterized in that these collectors are divided by low and high pressure, determined by the pressure of compressed air in the parts of the pneumatic system with which they are connected.

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