RU347U1 - Device for keeping cables under constant air overpressure - Google Patents

Abstract

A device for keeping cables under constant air overpressure, comprising a compressor, a receiver, a moisture separator, two gearboxes, a control unit, an electric contact pressure gauge, a drying chamber, a humidity indicator, to the output of which an emergency exit rotameter is connected, a second pressure gauge and a second reducer, to the output of which are connected the third pressure gauge and outlet valve, characterized in that three check valves, a cooler, an electro-pneumatic drain valve, two air filters, a pneumatic valve are introduced into it a throttle, a second receiver, a fourth pressure gauge and a bypass pipe connected in parallel with the humidity indicator, while the compressor is connected to the first receiver through a series of connected first non-return valve, cooler, dehydrator, first air filter, dehumidifier, second air filter and second non-return valve, and the output of the first receiver is connected to the humidity indicator through the first gear to the second output of the moisture separator is connected drain electro-pneumatic valve to the output of the second air the second filter and the pneumatic throttle are connected to the second receiver and the fourth pressure gauge, the pneumatic input of the electrical contact pressure gauge is connected to the input of the first receiver, the first and second inputs of the control unit are connected respectively to the lower and upper contacts of the electrical contact pressure gauge, and the first and second outputs of the unit controls are connected respectively to the compressor motor and the control input of the electro-pneumatic valve.

Description

The proposed utility model relates to devices for servicing cable lines, mainly to devices for keeping telephone cables under constant air overpressure and can be used, for example, at telephone exchanges.

Known stationary compressor installation used for the maintenance of telephone cables under constant air pressure (see: General instructions for construction in-line: urban telephone networks, M., Communication l 1 about,).

It consists of: a compressor, a reducer, three cylinders of a dehumidifier and a filter, a hygrometer, an outlet into the unit’s inlet, and a shield with pressure gauges with a combination of §-l11 th-g sides. The hygrometer output is connected to one of the connecting tubes if the air pressure in it, and therefore in the cable connected to it, decreases below the permissible value

The main disadvantages of a stationary compressor installation are the low operational hours and in 1 hour, 43 because of the need for a constant presence on tiopaT for KOHT OJra pressure gauges and switching the unit output to cables with reduced air pressure, and also because of the need for frequent replacement of cylinders with a desiccant for regeneration. Reasons

These disadvantages are the lack of automation and an integrated dryer regeneration system.

 IJ. ||.; .-. 1 ,. ,.

. m ,,, h ..

     - b

5 d2.0b in / 1 /

A useful model is the KSU-2M compressor and signal installation (see: KSU-2M compressor and signal installation, Technical description Зт2р959,008 ТО. М., Vneshtorgizdat, appendix, ZT2.959.008 PE circuit and Zt2.959.008 33 circuit). The KSU-2M installation contains a compressor connected to the input of the electro-pneumatic control unit through a series-connected receiver, a moisture-oil separator and a first gearbox. The installation uses two drying chambers, the inputs of which are connected to the corresponding outputs of the electro-pneumatic control unit. The outputs of the drying chambers are connected to the input of the humidity indicator. An emergency exit rotameter, an emergency exit pressure gauge and a second gear are connected to the indicator output. The output of this gearbox is connected to an output pressure gauge and an output valve. Thermoelectric heaters and a temperature relay are mounted in each drying chamber. The installation also has an electric contact pressure gauge.

The main disadvantages of installing the compressor-signal KSU-2M are low reliability and insufficient degree of air drying. The disadvantages are caused,., Firstly, by the fact that for the regeneration of the desiccant in the drying chambers, an evaporation method is used, which requires electric heaters and temperature relays, which often fail due to harsh operating conditions. Secondly, the reliability of this installation is reduced due to private breakdowns and detuning of the nodes of the control unit. The low reliability of the KSU-2M installation leads to the fact that in practice the humidity of the air pumped into the cable lines is higher than the permissible value. This leads to telephone interruptions.

The objective of the utility model is to create a highly reliable device for keeping cables under constant air overpressure with a high degree of purification and air drying. To solve this problem, a device for keeping cables under constant air overpressure, containing a compressor, receiver, water separator, two gearboxes, a control unit, an electric contact pressure gauge, a drying chamber, a humidity indicator, to the output of which an emergency exit rotameter, a second pressure gauge and a second gearbox are connected , to the output of which a third pressure gauge and an output valve are connected, three non-return valves, a cooler, a drain electro-anemonic valve, two air filters, a pneumatic Rossel, second receiver, fourth pressure gauge and bypass tube. In this case, the compressor is connected to the first receiver through a series-connected first non-return valve, a cooler, a water-oil separator, a first air filter, a drying chamber, a second air filter and a second non-return valve. The output of the first receiver is connected to the humidity indicator through the first gearbox. A bypass tube is connected in parallel to the humidity indicator. An electro-pneumatic valve is connected to the second output of the moisture separator. A second receiver and a fourth pressure gauge are connected to the output of the second air filter through a pneumatic throttle and a third non-return valve connected in parallel with it. The pneumatic input of the electrical pressure gauge is connected to

input of the first receiver. The first input of the control unit is connected to the lower contact of the electrical contact pressure gauge, the second input of this unit is connected to the upper contact of the electrical contact pressure gauge

, man. The first output of the control unit is connected to the compressor motor. The second output of the control unit is connected to the control input of the electro-pneumatic valve.

The introduction of the first non-return valve and two air filters can improve the reliability of the proposed device and the degree of air purification. In this case, the introduction of a drain electro-pneumatic valve and its connection with the output of the control unit improves the reliability of the proposed device due to the automation of the process of removing condensate from the oil and water separator. The introduction of the second receiver, pneumatic throttle, the second and third check valves, the fourth pressure gauge and the connections between the electric contact pressure gauge and the control unit, as well as the connection between the latter and the compressor motor, can improve the reliability of the proposed device due to the transition from drying by evaporation method used in the KSU- installation 2M, to dry by a short cycle non-heating method. At the same time, there is no need for such unreliable elements as electric heating elements and temperature relays, since the drying process is carried out by absorbing moisture from the air flow with a desiccant filling the dehumidification chamber, and the desiccant is regenerated without heating by blowing it with dry air from the second receiver. As a result of purging, moisture comes to the surface of the desiccant and is blown into the atmosphere through an open drain electro-pneumatic valve. Thus, due to the introduction of additional air purification and the rejection of unreliable elements, a solution to the problem is achieved.

  (

V FIG. I is a structural diagram of the inventive device.

On Fig, 2 shows a diagram of one of the possible options for the control unit.

The proposed utility model can be implemented in the form of a device for keeping cables under constant air overpressure, comprising a compressor I, a first check valve 2, a cooler 3, a moisture oil separator 4, a first air filter 5, a drying chamber b, a second air filter 7, and a second check valve 8, electro-pneumatic drain valve 9, first receiver 10, pneumatic throttle II, electrical contact pressure gauge 12, third check valve 13, second receiver IA-, first gearbox 15, humidity indicator 16, parallel to the bypass pipe 17, a second gearbox 18, an output valve 19, a second, third and fourth pressure gauges 20, 21 and 22, respectively, an emergency exit flowmeter 23, and also a control unit 24 are connected to the second. Compressor I through the first check valve 2 (for example, valve 2 UHL-4 GOST 21324-83), cooler 3 (made, for example, in the form of a coil from a copper tube f 10 ... 12 mm), divider 4, the first air filter 5, a drying chamber 6, a second air filter 7, similar to filter 5, a second check valve 8, similar to valve 2, a first receiver 10, a first reducer 15, a humidity indicator 16, and a second reducer 18 are connected to the outlet valve 19 and the third pressure gauge 21. An electro-pneumatic valve 9 is connected to the second output of the moisture separator 4, and the output is K the second air filter 7 through parallel-connected-pneumatic throttle II and check valve 13, similar

  /

-5 valves 2 and 8, a vure receiver 14 and a pressure gauge 22 are connected (for example, type МТП-1-1, б-С ТУ 25о02.012.1293-75). An electrocontact manometer 12 is connected to the input of the first (main) receiver 10 (for example, the ECM I UT-1.0 MPa manometer TU25,02,31-75). A second pressure gauge 20 is connected to the output of the humidity indicator 16, similar to the pressure gauge 22 and the emergency exit rotameter 23 (for example, the rotameter RM-A-0.25 GUZ TU1-01-0249-75). The output of the valve 19 is the main output of the proposed device, the output of the rotameter 23 - its emergency exit.

The control unit 24 (see Fig. 2) can be performed, for example, consisting of a control signal generator based on

- To trigger 25, the non-inverting output of which is connected through a power amplifier 26 on a KT805 bipolar transistor with an inverter 27 and a block of optocoupler thyristors, for example, type TO-I32-25, consisting of three pairs of optocontrolled thyristors 28-33. The thyristors of each pair 28 and 29, 30 and 31, 32 and 33 are connected in parallel, but in different polarity. The optocoupler inputs of each thyristor are connected to the output of the power amplifier 26. The inverter 27 is made, in particular, on a powerful transistor KT805. For each pair of thyristors 28 and 29, 30 and 31, 32 and 33, a voltage is supplied to one of the phases of a three-phase electric network. The inputs J and / C of the trigger 25 are respectively the first and second inputs of the control unit 24, which are connected respectively to the lower and upper contacts of the pressure gauge 12. The outputs of each pair of thyristors 28 and 29, 30, 31, 32 and 33 form the first output of the control unit 24 which is connected to the compressor motor I. The output of the inverter 27 is the second input of the control unit 24 and is connected to the control input “f

laziness of the olive electro-pneumatic valve 9.

In the General case, the control unit 2 can be performed according to other schemes.

Voe elements, blocks, nodes and devices included in the proposed device are known in the art.

The proposed device for keeping cables under constant air overpressure works as follows. Immediately after the installation is turned on, when the air pressure at the inlet of the first receiver 10 is low, the arrow of the electrical contact pressure gauge 19 closes the lower contact. When the output of the trigger 25 of the control unit 24 appears, the compressor start signal I. The signal is amplified by the power amplifier 26 and causes the LEDs of the optoelectronic pairs to be illuminated. thyristors 28-33. With this, the thyristors 28-33 open, their resistance decreases and the power supply voltage is supplied to the electric motor of the compressor I. At the same time, the control unit 24 generates a signal that closes the drain electro-pneumatic valve 9, The air pumped by the compressor I passes through the first non-return valve 2, cooler 3, moisture separator 4 and the first air filter 5, being cleaned of capillary moisture, oil and mechanical dust. The condensate accumulated in the reservoir of the moisture separator 4, after the end of the compressor I, is automatically removed through the drain electro-pneumatic valve 9. Next, pre-purified air passes through a drying chamber b filled with adsorbent, where adsorption occurs at elevated pressure. After drying, air through the second air filter 7 and the second check valve 8 enters the first receiver 10, and part of the dried air.

-IC ЗМЬ

of spirit through TpefHft, the check valve 13 enters the second receiver 1. The intake of air into the first receiver 10 is controlled by an electrocontact pressure gauge 12. After filling the receivers 10 and IA-, when the air pressure reaches the desired value, the arrow closes with the upper contact in the electrocontact nanometer 12. In this case, the stop signal of compressor I appears at the output of trigger 25 of control unit 24-. The thyristors 28-33 of control unit 2 are locked, their resistance increases sharply and the supply voltage is removed from the compressor motor I. At the same time, the drain electro-pneumatic valve 9 opens. movement from the drying chamber b through the open drain electro-pneumatic valve 9 rushes into the atmosphere, creating a resolution in the drying chamber 6 and taking away the moisture accumulated in the tank omaslootdelitelya condensate. The air stream of dried air from the second receiver 1 through the pneumatic throttle II and the second air filter 7 rushes into the drying chamber b, where the desiccant - adsorbent is regenerated or desorbed due to the pressure drop. When this moisture leaves the pores of the adsorbent on its surface and the dried air is blown into the atmosphere through an open drain electro-pneumatic valve 9. The duration of the regeneration cycle is set by a pneumatic throttle II. The first receiver 10 collects dried air. Since the amount of air used to keep the cables connected to the device under excessive pressure is much less than the capacity of the unit, the compressor has a short duration compared to the regeneration time. Air out

q y g.

the first receiver 10 passes through the first gearbox 15 and the humidity indicator 16 about the bypass tube 17 and is distributed in two directions:

-to operated cables in a chain: a second gearbox 18 and an output valve 19,

-8 emergency exit through the rotameter 23 emergency exit. Using the first and second gears 15 and 18, the air pressure decreases from 6.0 kgf / cm to 1.2 kgf / cm and 0 kgf / cm, respectively, and is controlled by pressure gauges 20 and 21. The humidity indicator 16 indicates the degree of air drying by color change absorbent. The outlet pipe 17 is installed parallel to the humidity indicator 16 to increase air flow. If necessary, the supply to the cable line of air with high pressure is used emergency exit through the rotameter 23.

The proposed utility model provides a high degree of drying, at least up to 1.5 - 2 / o, analogues - at least 40 - 45%. It uses a non-heating adsorbent regeneration method and an electronic control unit 24, and also there are no unreliable elements in the prototype device: thermoelectric heaters and temperature relays, cam electrocommand device, etc. Due to the high degree of purification and drying of air and increased reliability, the proposed device solves the problem.

In the proposed device for maintaining cables under constant air overpressure, known components and parts manufactured by the industry are used: compressor, check valves, cooler, dehydrator, air filters, dehumidification chamber, choke,

receivers, manometers, gears, moisture indicator, Rogameter, control unit elements. Due to this, it can be easily made in practice, having received a significant gain in reliability without additional development costs.

/ 9

fcr

Claims (1)

A device for keeping cables under constant air overpressure, comprising a compressor, a receiver, a moisture separator, two gearboxes, a control unit, an electric contact pressure gauge, a drying chamber, a humidity indicator, to the output of which an emergency exit rotameter is connected, a second pressure gauge and a second reducer, to the output of which are connected the third pressure gauge and outlet valve, characterized in that three check valves, a cooler, an electro-pneumatic drain valve, two air filters, a pneumatic valve are introduced into it a throttle, a second receiver, a fourth pressure gauge and a bypass pipe connected in parallel with the humidity indicator, while the compressor is connected to the first receiver through a series of connected first non-return valve, cooler, dehydrator, first air filter, dehumidifier, second air filter and second non-return valve, and the output of the first receiver is connected to the humidity indicator through the first gear to the second output of the moisture separator is connected drain electro-pneumatic valve to the output of the second air the second filter and the pneumatic throttle are connected to the second receiver and the fourth pressure gauge, the pneumatic input of the electrical contact pressure gauge is connected to the input of the first receiver, the first and second inputs of the control unit are connected respectively to the lower and upper contacts of the electrical contact pressure gauge, and the first and second outputs of the unit controls are connected respectively to the compressor motor and the control input of the electro-pneumatic valve.