 Hello friends, myself, Professor S.P. Mankani, Assistant Professor, Department of Mechanical Engineering, Walchand Institute of Technology, Solapur. Today we are going to study the reciprocating compressor. At the end of this lecture, students will be able to understand working principle of reciprocating compressor. So here we are going to study the construction and working of single stage reciprocating compressor. So here the different parts I will explain it. In the next bit we are going with the working principle of this particularly the reciprocating compressor is concerned. So here, so this particularly the crank and this total frame is going to be fixed up on the frame support and here it is a connecting rod and this one is a piston and this is the cylinder, piston cylinder and this is a piston. So now here, so this is the inlet air is coming through this one and this is the inlet wall is provided here which is going to be operating with the help of this particularly the motion is going to be restricted with the spring is concerned and this is the delivery wall is concerned. This is the delivery wall and here is the air outlet that is the outlet of air is going to be taking place through this particularly point is concerned. This side it is inlet and this side it is the outlet and this is the connecting rod and this one is the piston and the cylinder portion and here this is provided as a side just you can observe it here it is a water container this container is there. Surrounding they are going to be provided water to protect the this piston and cylinder system is concerned that because otherwise this is going to be becoming as a hot to avoid that one water is going to be circulated in this particular portion is concerned. Now we are going with the how exactly it works the induction stroke and one more as a the expansion is going to be taken place in the particularly when the air is entering and one more as a compression is going to be taking place we are going to be studying in detail in the next bit. So this is what we are going to be considering it is a induction stroke. So here particularly you can consider the piston supposed to be there in this particular position. Stuff here it is at the I have shown it is a central part now we can consider the piston is supposed to be there as a top dead center top dead center means that time this inlet wall as well as outlet wall is closed inlet wall as well as outlet wall is closed that time this particularly position will be there as here it is the piston position is here means this space is occupied with the air is concerned this space is occupied with the air is concerned. So now the piston starts moving in the downward direction piston start moving in the downward direction that is what we are going to be calling it as a induction stroke ok piston is starts moving in the downward direction when the piston starts in the moving in the downward direction ok when the piston is moving in the downward direction that time whatever the air is available here it is going to be expanded that air is going to be getting a more space because previously it is a higher pressure, the air is going to be expanded because of the expansion, because of this particularly air expansion in this particular position of a piston and cylinder, this valve is going to be coming in this way means it is going to be lifted in this way it is concerned, it is lifted in this way. So because that time whatever the expansion is going to be taken place whatever the pressure available at the inside the cylinder is less than the atmospheric pressure. The pressure available inside the cylinder is less than the atmospheric pressure and that is the reason this particular valve is going to be pushing it in the this way. So here I shown it here as a it is a spring is there. So means inside there is a pressure will be less than the outside pressure that time this air is trying to push this one valve means this is going to be pushing it in this way is concerned and that is the reason here is a spring is operating and that is why this is going to be pushed in this way in here it is going to be pushed in this way and that time air is going to be entering here. Once again there is a expansion is going to be taken place further means it is coming up to this particularly as a top dead center sorry this is a bottom dead center when it is coming in the downward direction it reaches at the end. So when it reaches at this downward side end so that time completely it is going to be filled up with the air is concerned the air is continuously flowing in this way and it is going to be filled up with the air. So at a certain time when there is a end is going to be reached means this is going to be rotated in this way and it is going to coming up to this particular point started at this particular point and it is coming this one. Now the position is shown it here means it is at a theta angle. So suppose if it is there at the top dead center here so that time this is at the end it is supposed to be piston is here so that time this position will be there here it is already taken this moment of this particular position now it is going to be taken position of this one means it is coming at the end. When it reaches at the end when it reaches at the end that part we are discussing at this stage is concerned so that time then it starts supposed to be it is moving in this way is concerned okay this is rotation is moving in this way when it is moving in this way so that time this piston is coming back to the top dead center coming back to this the upper portion this is coming back up to the upper portion means when it starts moving in the upper position so that time there will be increase in the pressure inside the air is going to be there air is going to be compressed here the air is going to be compressed at the same time you understand this wall is going to be forced to come in the downward direction it is going to be forced here and then once again this is the pressure inside this one is more than the atmospheric pressure that time pressure inside the cylinder is more than the atmospheric so because of that particular pressure this wall is going to be closed when this wall is going to be closed the pressure is going to be gone increasing because this wall previously closed and this also closed and that time the air pressure is going to be increased and here also there is a spring is provided here also there is a spring is provided here so when this pressure is going to be increased here so that time this wall is going to be closed and this is going to be open because it is in the upward direction this spring is going to be lifted. So, at the same time, so this when it is wall is going to be opened the air tries to enter here because air already air is available here with the higher pressure when the pressure of this particular air is more than the available pressure at this particularly delivery pipe. So, that time this air tries to push this one wall in the upward direction then air is coming in this delivery pipe and the air is trying to push in the upward direction. So, that time wall is opened and the air is entering through this way the air is trying to enter this particular wall up to the piston position here whenever it reaches this particular position of the piston in this particular position. So, that time this connecting rod coming back to this particularly here this is back to this particular position. So, once again so that time you can understand that particularly the position as when it reaches here further it will not increase the pressure that time the pressure here will be more automatically it pushes this particularly wall in the downward direction there is a delivery wall it in the downward direction means because whether it is closed and this is closed this is also closed when it reaches this particular position of the connecting rod to this particularly the crankshaft it reaches this particular position. So, that time once again it tries to open it means once again there is a expansion is going to be taken place and this cycle is going to be repeated for the next part is concerned. So, here so the delivery part I am explaining here up to this one as the suction is taken now it is a delivery part ok. So, now the delivery just you can observe it this is reaching this particular position the air is pushing this one the diagram is explaining as this particular layer is pushing this one in the upward direction because of that the air is entering in the delivery pipe. In this previous case you have seen that air is entering inside the this one arrow mark I have shown it as air is entering here and the next diagram air is entering through this particular delivery pipe when it is the crankshaft position you can observe it here in this diagram. Previous figure you have seen this one as position crankshaft this particular position and the connecting rod is in this way in the next diagram the connecting rod is coming into this particular position and that time it tries to send the air through this delivery pipe. The same concept you can see in the next slide the animation is concerned just you can observe it here just I given the walls position as a reverse nothing more than that one just you can observe it here the fresh air is coming through this way just you can observe a fresh air is coming through this way and when it becomes red that is a compression that time this wall is going to be opened and it is coming this blue color indicating suction and red color indication delivery part is concerned connecting rod and this piston and the crankshaft just for the reference we have shown it here. Thank you.