SU800590A1

SU800590A1 - Method and stand for carrying out service-life testing of heat exchanger

Info

Publication number: SU800590A1
Application number: SU792804957A
Authority: SU
Inventors: Владислав Кузьмич Салугин
Original assignee: Предприятие П/Я А-1665
Priority date: 1979-04-03
Filing date: 1979-04-03
Publication date: 1981-01-30

Description

(54) СПОСОБ ПРОВЕДЕНИЯ РЕСУРСНЫХ ИСПЫТАНИЙ(54) METHOD FOR CARRYING OUT RESOURCE TESTS

ТЕПЛООБМЕННИКАМ СТЕНД ДЛЯ ЕГО ОСУЩЕСТВЛЕНИЯHEAT EXCHANGERS STAND FOR ITS IMPLEMENTATION

ничивают временем стабилизации температуры холодного воздуха на выходе из теплообменника соответственно на верхнем и нижнем пределе.The time required for stabilizing the temperature of cold air at the exit from the heat exchanger at the upper and lower limits is reduced.

Такой способ может быть осуществлен стендом новой конструкции дл проведени ресурсных испытаний теплообменника , содержащим магистрали |гор чего и холодного воздуха с дроссел ми дл регулировани расхода и давлени и электрическими заслонками на лини х сброса и подачи гор чего воздуха в теплообменник, управл емыми электронными реле, включенными параллельно сигнальным цеп м открытого положени заслонок.Such a method can be implemented by a stand of a new design for conducting life tests of a heat exchanger containing hot and cold air lines with throttles for controlling flow and pressure and electric dampers on discharge lines and supplying hot air to a heat exchanger controlled by electronic relays, open parallel to the signal circuits of the open position of the dampers.

На входе стенда к магистрал м гор чего и холодного воздуха подсоединены электроконтактные манометры с контактами, включенными последовательно с электромеханическим реле, нормально открытые контакты которого включены параллельно контактам термометров, дополнительно установленными на выходе холодного воздуха и настроенв1ыми один на верхний, а другой - на нижний пределы температур .Electrocontact pressure gauges with contacts connected in series with an electromechanical relay, the normally open contacts of which are connected parallel to the contacts of thermometers additionally installed at the top of the cold air outlet and set to the lower limits temperatures.

На фиг. 1 изображена монтажна схма стенда дл проведени ресурсных испытаний; на фиг. 2 - электрическа схема автомата.FIG. 1 shows an assembly stand for life testing; in fig. 2 - electrical circuit of the automaton.

Стенд состоит из вибрационного станка с закрепленным на нем испытываемым теплообменником 1 с магистрал ми 2 и 3 холодного и гор чего воздуха . На входе магистралей 2 и 3 установлены расходомерные шайбы 4 и 5 и подсоединены электроконтактные мнометры ь и 7, а на выходе установлены дроссели 8 и 9. .Гор чий воздух подогреваетс до необходимой температуры подогревателем 10. К подогревателю 10 присоединены две линии лини 11 сброса с электрической заслонкой 12 дросселем 9 и лини 13 подчи гор чего воздуха в теплообменник электрической заслонкой 14 ко нтрольным манометром 15. На линии 1б выхода холоднохо воздуха установлены контактные термометры 17 и 18, настроенные соответственно на верхний и -нижний температурный предел. Заслоки 12 и 13 управл ютс от автомата 1 по сигналам от контактных термоNKTpoB и электроконтактных манометров .The bench consists of a vibration machine with a tested heat exchanger 1 fixed on it with highways 2 and 3 of cold and hot air. At the inlet of lines 2 and 3, flow washers 4 and 5 are installed and electrocontact monometers 7 are connected, and chokes 8 and 9 are installed at the outlet. The hot air is heated to the required temperature by the preheater 10. Two lines of the discharge line 11 are connected to the preheater 10 electric valve 12 with choke 9 and line 13 for supplying hot air to the heat exchanger by electric valve 14 with a control pressure gauge 15. On line 1b of the cold-air outlet, contact thermometers 17 and 18 are set, respectively tuned to the upper and - lower temperature limit. Sizes 12 and 13 are controlled from the automaton 1 by signals from the contact thermostats NKTpoB and electrical contact gauges.

Автомат 19 состоит из двух электронных реле 20 и 21, управл ющие цепи которых соединены соответственно с контактами 22 и 23 термометров. Реле 20 и 21 включены параллельно сигнальным цеп м открытого положени заслонок 14 и 12 с обмотками 24 и 25 возбуждени открытого и закрытого положений и концевыми выключател ми 26 и 27. Контакты 28 обмотки 29 управл ют работой заслонки 12The automaton 19 consists of two electronic relays 20 and 21, the control circuits of which are connected respectively to the contacts 22 and 23 of the thermometers. Relays 20 and 21 are connected in parallel to the signal circuits of the open position of the flaps 14 and 12 with the windings 24 and 25 of the excitation of the open and closed positions and limit switches 26 and 27. The contacts 28 of the windings 29 control the operation of the flap 12

контакты 30 обмотки 31 управл ют работой заслонки 14.The contacts 30 of the winding 31 control the operation of the shutter 14.

Последовательно с обмоткой реле32 включены электрические контакты манометров 7 и 6. Нормально открытые контакты 33 обмотки 32 включены параллельно контактам 22 и 23.The electrical contacts of the pressure gauges 7 and 6 are connected in series with the relay coil32. The normally open contacts 33 of the windings 32 are connected in parallel with the contacts 22 and 23.

Испытани на стенде провод т следующим образом.Bench tests were carried out as follows.

Включают гор чий и холодный воздух . Обычно холодный воздух подают в теплообменник 1 без подогрева, на|пример при 20°С вместо 140с. На такую же величину (12С°С) понижают и температуру гор чего, воздуха на входе. Дросселем 8 при открытой заслонке 14 и закрытой заслонке 12 устанавливают приемлемый расход воздуха , например 500 кг/ч, давление с поправкой на температуру.They include hot and cold air. Usually, cold air is supplied to the heat exchanger 1 without heating, for example, at 20 ° C instead of 140 s. The temperature of hot, inlet air is also lowered by the same amount (12 ° C). The throttle 8 with the open valve 14 and the closed valve 12 establish an acceptable air flow, for example 500 kg / h, the pressure adjusted for temperature.

Определ ют расход холодного воздуха , например 2000 кг/ч, и устанавливают его дросселем 8. Расходы контролируют с помощью расходомерных шайб 4 и 5. Перемеща контакты на манометрах 7 и б, устанавливают границы допустимого изменени давлени воздуха на входе в магистрали .The flow rate of cold air, for example, 2000 kg / h, is determined and its throttle 8 is installed. The costs are controlled using flow washers 4 and 5. By moving the contacts on the pressure gauges 7 and b, the limits of the allowable change in air pressure at the inlet to the line are established.

Перемеща контакты термометров 17 и 18, устанавливают верхнюю и нижнюю границы изменени холодного воздуха на выходе из теплообменника, например и 30°С.By moving the contacts of thermometers 17 and 18, the upper and lower limits of the change in cold air at the exit of the heat exchanger are established, for example, 30 ° C.

Claims

Include vibrating machine and automatic. Let the position of the switching elements before switching on correspond to the scheme of FIG. 2. At this time, the open-position lamp of the dampers lights up. A voltage is applied to the relays 20 and 21. The winding of the relay 31 is de-energized, and a current flows through the winding of the relay 29. When the movable contact 28 closes, a current flows through the initiating winding 25, and the air discharge valve 12 closes. The limit switches 27 are moved to a different position, and the closed position lamp will be switched off and the open position lamp will go out. The hot air through the damper 14 goes to the heat exchanger 1, heats the surface and transfers heat to the cold, while the contact closes 23. When the temperature of the cold air rises to the upper limit, the contacts 22 close. The winding of the relay 29 de-energizes, contact 28 opens the normally open contact and: normally closed contact, flap 12 opens. The limit switches 27 are shifted to the position indicated in FIG. 2. The open position lamp lights up and the voltage is applied to the relay 14, and since the contacts 23 are closed, a current flows through the winding 31. The movable contact 30 closes the contact of the normal opening, but the hot air supply valve 14 closes, into the heat exchanger 1. The limit switches 26 move to another position. The heat exchanger 1 is cooled, the temperature of the cold air reaches the lower limit, contact 23 opens, the coil of relay 31 de-energizes, contact 30 closes the normally closed contact, and flap 14 opens. The limit switches 26 occupy the position indicated in FIG. 2. A voltage is applied to the relay 20, and since the contacts 22 are open, current 29 flows through the current and the contact 28 closes the normally open contact, and the process repeats. If at any {the moment of operation the stand the flow of hot or cold air changes and goes out of limits, one or the other contact of the pressure gauge 7 and 6 coils. A current flows through the winding of p & 32 and the contacts open normally open. contacts normally closed. Light mode is extinguished. At that, the valve 14 for supplying air to the heat exchanger 1 was opened, the valve 12 was released into the air and then the valve 14 was closed. If the valve 12 was opened, the stand would remain in that position even if contacts 23 were open. will not work if the specified parameters are off from the mode. If the parameters are restored, the stand will work again. The number of test cycles is fixed by the counter 15, which is connected in parallel with the signal lamp of the closed position of the valve 12. The present invention reduces the energy costs of maintaining the quality of the tests and the level of operational loads on the test heat exchanger. Claim 1. Method of carrying out life tests of a heat exchanger by blowing air cavities of its cavities under vibration load conditions with periodic change of temperature conditions and periodic increase of working pressure in the hot cavity, characterized in that in order to reduce energy costs, blowing is carried out at low the same value of average temperatures of hot and cold flow and lower air flow rates compared to workers, and the cost ratio is chosen from the conditions and relating the zadannohche koe efficients of heat transfer, and the operating pressure in the hot chamber is increased shno Proportional change; temperature limit of the heat exchanger.

2. A method according to claim 1, characterized in that the duration of each period is limited by the time for stabilization of the temperature of the cold flow of vo (Spirit at the exit of the heat exchanger at the upper and lower limits, respectively.

3. Stand for carrying out life tests of the heat exchanger by the method according to claims. 1 and 2, containing hot and cold air magnets with throttles for regulating both pressure and electric dampers on the discharge lines and supplying hot air to the heat exchanger, controlling the electronic relays connected in parallel with the open position of the dampers, characterized in that At the inlet to the main line of hot and cold air, they are connected to an eJ (TPO, contact gauge contacts, connected in series with an electromechanical relay, normally open contacts of which are connected in parallel About the thermometer contacts, additionally installed at the cold air outlet and tuned one to the upper and the other to the lower temperature limit. Sources of information taken into account during the examination 1. USSR author's certificate 574657, cl. G 01 M 13/00, 1977 .