* Estimated delivery times start from the date of shipment, excluding processing time.
* Actual delivery times may vary due to holidays, weather conditions, or customs delays.
Usafirishaji wa kawaida bila malipo kwa maagizo zaidi ya $9.9
Sera ya Kurudisha
Rudisha bidhaa zitakubaliwa ndani ya siku 40 tangu tarehe ya kupokea bidhaa. Bidhaa zilizobuniwa haziwezi kurudishwa au kubadilishwa. Bidhaa zilizonunuliwa na kadi ya zawadi ya elektroniki zinaweza kubadilishwa tu; rudi pesa haifai.
Zawadi ya Bure
Karibu Roymall, tovuti yako ya kitaalamu ya kununua zawadi za hifadhi ya duka. Tunathamini na kushukuru msaada wako, na tunataka kuonyesha shukrani yetu kwa kuongeza kipengele cha msisimko wa ziada kwa ununuzi wako. Unaponunua nasi, sio tu utapata bidhaa za hali ya juu zinazoboresha maisha yako, lakini utapata pia zawadi ya bure ya kipekee kwa kila agizo lako. Tayari kuchunguza mkusanyiko wetu na kupata zawadi zako kamili? Chunguza uteuzi wetu wa bidhaa za hifadhi ya duka, weka agizo lako na subiri msisimko wa zawadi yako ya bure kufika pamoja na ununuzi wako.
Sera ya Usafirishaji
Tutafanya kazi kwa bidii kukufikishia bidhaa baada ya kupokea maagizo yako na kuhakikisha zinafika salama. Maelezo ya uwasilishaji yatakuwemo kwenye barua pepe yako ya uthibitisho.Kwa hali ya kawaida, maagizo huchakatwa ndani ya siku 2. Katika hali maalum, yanaweza kucheleweshwa kama ifuatavyo: Unapoagiza Jumamosi, Jumapili au siku za likizo, itacheleweshwa kwa siku 2.Kwa kawaida, inahitaji siku 5-7 za kazi (Jumatatu hadi Ijumaa) bila kuathiriwa na ucheleweshaji wa ndege au mazingira mengine.Kwa sababu huduma yetu ya usafirishaji ni kimataifa, muda wa uwasilishaji utategemea eneo lako, kwa hivyo inaweza kuchukua muda na tafadhali subiri kwa subira ikiwa uko katika wilaya au nchi za mbali.
1. Sera ya Kurudisha na Kubadilisha
Tunakubali tu bidhaa zilizonunuliwa kutoka roymall.com. Ikiwa unanunua kutoka kwa wasambazaji wetu wa ndani au wauzaji wengine, huwezi kuzirudisha kwetu.Bidhaa za mauzo ya mwisho au zawadi za bure hazikubaliki kwa kurudisha.Ili kuwa na haki ya kurudisha, bidhaa yako lazima isitumike na iwe katika hali ileile uliyoipeleka. Pia lazima iwe kwenye pakiti ya asili.Baada ya kupokea maagizo ya kurudisha kutoka kwetu, tafadhali pakiti bidhaa zako zilizorudishwa na kuacha kifurushi chako kwenye ofisi ya posta ya ndani au mtoa huduma mwingine wa usafirishaji. Tutachakata bidhaa yako ya kurudisha au kubadilisha ndani ya siku 3-5 za kazi baada ya kuipokea. Rudi pesa itachakatwa na kuwekwa kiotomatiki kwenye njia yako ya awali ya malipo.Hakuna kurudisha au kubadilisha kunaweza kukubaliwa ikiwa bidhaa ilitengenezwa kwa maagizo maalum, ikiwa ni pamoja na saizi maalum, rangi maalum au uchapishaji maalum.Ikiwa unahitaji msaada zaidi, tafadhali wasiliana nasi. service@roymall.com au Whatsapp: +447549870296
2. Sera ya Kurudisha Pesa
Utapata rudi pesa kamili au stoo 100% ya stoo baada ya kupokea na kukagua kifurushi kilichorudishwa. Rudi pesa itachakatwa kiotomatiki kwenye njia yako ya awali ya malipo.Tafadhali kumbuka kuwa gharama za usafirishaji na ushuru wowote au ada hazirudishiwi. Gharama za ziada za usafirishaji hazirudishiwi mara tu kifurushi kimetumwa. Wewe ndiye mwenye jukumu la kulipa ada hizi na hatuwezi kuziacha au kuzirudisha, hata kama agizo litarudishwa kwetu.Mara tu tutakapopokea na kuthibitisha bidhaa yako iliyorudishwa, tutakutumia barua pepe kukujulisha kuwa tumepokea bidhaa yako. Pia tutakujulisha kuhusu uthibitisho au kukataliwa kwa rudi pesa yako.Ikiwa una shida yoyote kuhusu mchakato wa kurudisha pesa, tafadhali wasiliana nasi. service@roymall.com au Whatsapp: +447549870296
Stirling Engine Model Vacuum Motor Model Kit
Description:
Engine Model Vacuum Motor Model Kit
Features:
With the help of the flywheels, then a net conversion of heat energy to mechanical work. Mechanical work through small generators produce electricity to power a light bulb.
Can be used for teaching purpose.
What is the Stirling Engine?
A Stirling engine is a heat engine that operates by cyclic compression and expansion of air or other gas, the working fluid, at different temperature levels such that there is a net conversion of heat energy to mechanical work.The engine is like a steam engine in that all of the engine's heat flows in and out through the engine wall.
How it works?
This is traditionally known as an external combustion engine in contrast to an internal combustion engine where the heat input is by combustion of a fuel within the body of the working fluid. Unlike the steam engine's use of water in both its liquid and gaseous phases as the working fluid, the Stirling engine encloses a fixed quantity of permanently gaseous fluid such as air or helium. As in all heat engines, the general cycle consists of compressing cool gas, heating the gas, expanding the hot gas, and finally cooling the gas before repeating the cycle.
Двигатель полностью выполняет свою учебно- познавательную функцию. Качество изготовления на высоте, внешний вид очень, как по мне, приятный.
Оси вращения крепятся через миниатюрные подшипники. Вращение всех узлов двигателя плавное и тихое. Сборка отличная, все чистое, никаких отпечатков пальцев, потеков масла, грязи и т.д. Просто идеально. Основные материалы – сталь, маховики дюраль, противовесы – латунь.
Двигатель полностью выполняет свою учебно- познавательную функцию. Качество изготовления на высоте, внешний вид очень, как по мне, приятный.
Оси вращения крепятся через миниатюрные подшипники. Вращение всех узлов двигателя плавное и тихое. Сборка отличная, все чистое, никаких отпечатков пальцев, потеков масла, грязи и т.д. Просто идеально. Основные материалы – сталь, маховики дюраль, противовесы – латунь.
Двигатель полностью выполняет свою учебно- познавательную функцию. Качество изготовления на высоте, внешний вид очень, как по мне, приятный.
Оси вращения крепятся через миниатюрные подшипники. Вращение всех узлов двигателя плавное и тихое. Сборка отличная, все чистое, никаких отпечатков пальцев, потеков масла, грязи и т.д. Просто идеально. Основные материалы – сталь, маховики дюраль, противовесы – латунь.
This is a vacuum engine. When properly adjusted it works well
On mine the round rod at the top, the one that moves the hole covering leaf type valve, needed to be adjusted. This can be done by holding the levers at the side with thumb and forefinger of one hand while moving the round rod slightly up or down. When moving the flywheel counterclockwise, a cliciking soind should be heard.
One needs to play with it by trial and error until the motor runs well. The hole in the front needs to be completely covered when in the lower position.
This is a vacuum engine. When properly adjusted it works well
On mine the round rod at the top, the one that moves the hole covering leaf type valve, needed to be adjusted. This can be done by holding the levers at the side with thumb and forefinger of one hand while moving the round rod slightly up or down. When moving the flywheel counterclockwise, a cliciking soind should be heard.
One needs to play with it by trial and error until the motor runs well. The hole in the front needs to be completely covered when in the lower position.
This is a vacuum engine. When properly adjusted it works well
On mine the round rod at the top, the one that moves the hole covering leaf type valve, needed to be adjusted. This can be done by holding the levers at the side with thumb and forefinger of one hand while moving the round rod slightly up or down. When moving the flywheel counterclockwise, a cliciking soind should be heard.
One needs to play with it by trial and error until the motor runs well. The hole in the front needs to be completely covered when in the lower position.
Tips:For questions about your order, place of delivery, product discount, taxation, delivery time, warranty, shipping, payment, exchange rate, and other questions unrelated to the product, please contact customer service.
Para esta pergunta você pode enviar e-mail para nós: cservice@banggood.com Obrigado pelo seu apoio. A propósito, há um cupom de 20% de desconto para esta página de coleta. (código do cupom: 20toys) https://www.banggood.com/Collection-6243.html
Para esta pergunta você pode enviar e-mail para nós: cservice@banggood.com Obrigado pelo seu apoio. A propósito, há um cupom de 20% de desconto para esta página de coleta. (código do cupom: 20toys) https://www.banggood.com/Collection-6243.html