CN101634289A - Method for reducing end face clearance volume of piston type compressor cylinder - Google Patents
Method for reducing end face clearance volume of piston type compressor cylinder Download PDFInfo
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- CN101634289A CN101634289A CN200910167443A CN200910167443A CN101634289A CN 101634289 A CN101634289 A CN 101634289A CN 200910167443 A CN200910167443 A CN 200910167443A CN 200910167443 A CN200910167443 A CN 200910167443A CN 101634289 A CN101634289 A CN 101634289A
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Abstract
The invention discloses a method for reducing the end face clearance volume of a piston type compressor cylinder. The piston type compressor cylinder is provided with a cylinder body, a cylinder cover, a piston and a piston rod, and the piston is driven by the piston rod to perform reciprocating movement in the cylinder body. The method comprises the following steps: calculating the diameter and the thickness of a steel plate according to the diameter of the inner end face of the cylinder cover and the clearance volume required to be eliminated; processing the steel plate into the calculated shape; and coaxially fixing and connecting the steel plate and the inner end face of the cylinder cover through screws or by welding. The method for reducing the end surface clearance volume of the piston type compressor cylinder reduces the clearance volume of a unit, increases the displacement of the unit and improves the efficiency of the unit.
Description
Technical field
The present invention relates to a kind of method that reduces of end face clearance volume of piston type compressor cylinder.
Background technique
Because the needs of aspects such as piston compressor structure, manufacturing, assembling, running, certain space or gap are left in some position in the cylinder, compressor in exhaust at the end, piston can not fit with the wall of cylinder end, inevitable remaining sub-fraction pressurized gas are called clearance volume with this part pressurized gas occupied volume of cylinder under this state in the cylinder.Compressor exists clearance volume at following position: 1, piston motion exhaust stroke at the end, the gap between piston end surface and the cylinder end face; 2, cylinder minute surface and the gap between outside piston week (from the end face to the top piston ring); 3, since air valve to the formed volume of the passage of volume of cylinder.For the clearance volume of compressor, it is necessary to have plenty of structural needs, has plenty of to be difficult to eliminate.
Compressor a circuit exhaust at the end still has the pressurized gas of failing to discharge owing in the clearance volume, so the existence of clearance volume has directly reduced the air displacement of compressor.Simultaneously, in the clearance volume remaining pressurized gas at first expand in the starting stage of backward stroke of the piston, have only when this part gas and be expanded to inner pressure of air cylinder when identical with sucking pipe internal pressure (pressure of inspiration(Pi)) or low slightly, cylinder could begin air-breathing, so the existence of clearance volume has also caused the postponement of breathing process, the minimizing of gettering quantity.The final also nature of the minimizing of gettering quantity will have influence on the air displacement of compressor.In addition, the gas in the clearance volume is along with the to-and-fro motion of piston, the time and expand, the time and be compressed, compressor need constantly done idle work to this portion gas.In a word, clearance volume is influential to the throughput and the efficient of compressor, and clearance volume is crossed throughput and the efficient that conference makes compressor and sharply descended.Therefore, under the prerequisite that guarantees the compressor safe operation, clearance volume should be as much as possible little.
Current, for an existing piston formula compressor, excessive as the cylinder end face clearance volume, reducing method has:
1, change piston, increase piston thickness, specifically, piston is replaced by the bigger piston of thickness, reduce the gap of piston and cylinder end face, thereby reduce the cylinder end face clearance volume, the method need be changed piston, the cost height;
2, plush copper is set to eliminate the gap between piston and the cylinder end face on the top of piston, the boss that the method is provided with is with piston motion, bear bigger inertial force, boss also bears the alternating stress effect in gas compression, expansion, air-breathing, the exhaust process, the reliability that boss connects is a greater impact, life-span can shorten, and is only applicable to slow-revving unit;
3, change cylinder head, increase the thickness of cylinder head, specifically, cylinder head is replaced by the bigger cylinder cap of thickness, it is more some more to make cylinder head go deep into the size of minute surface in the cylinder, thereby reduces the cylinder end face clearance volume, and the method need be changed cylinder cap, the cost height;
4, carry out the adjustment of clearance volume by the pad of adjusting cylinder head, the surplus of the method adjustment is limited, and spacer thickness is crossed the sealability that the young pathbreaker reduces cylinder and cylinder head;
5, the thickness of attenuate cylinder head and cylinder block connecting flange face, make the cylinder head inwall more go deep into minute surface in the cylinder, the surplus of the method adjustment is limited, and cylinder cap flanged surface thickness reduces and will influence the strength and stiffness of cylinder cap, influences the safe and reliable operation and the sealability of unit.
Summary of the invention
Technical problem to be solved by this invention is: a kind of method for reducing end face clearance volume of piston type compressor cylinder is provided.
Solving the problems of the technologies described above employed technological scheme is: the steel plate that increases a suitable thickness at the interior edge face of existing cylinder head, steel plate and cylinder cap are joined the drilling screw hole, on cylinder cap, carry out tapping, connect steel plate and cylinder cap by fastening screw trip bolt, the clearance volume amount that steel plate thickness is adjusted as required and deciding.
According to embodiments of the invention, by being provided, a kind of method for reducing end face clearance volume of piston type compressor cylinder realizes that piston type compressor cylinder of the present invention has cylinder block, cylinder head, piston and piston rod, piston is to-and-fro motion in cylinder block under the drive of piston rod, it is characterized in that described method comprises: calculate the diameter of steel plate according to the diameter of the interior edge face of cylinder head, the clearance volume of eliminating is calculated the thickness of steel plate as required; Steel plate is processed into the shape of calculating; Utilize screw or pass through welding the interior edge face of steel plate and cylinder head is fixedlyed connected coaxially.
About the little 5mm of radius of the radius ratio cylinder block of described steel plate.
When utilizing screw that the interior edge face of steel plate and cylinder head is fixedlyed connected coaxially, the material of described steel plate can be Q235 or 16Mn.
Utilize screw just the interior edge face of steel plate and the cylinder head step of fixedlying connected coaxially can comprise: steel plate is placed on the interior edge face of cylinder head, adjusts after the position, at the corresponding position of steel plate and cylinder head drilling to position; On steel plate and cylinder head, join the drilling screw hole by proportional spacing, and the screw hole on the cylinder head is processed into counter sink; Carry out tapping in the counter sink that on cylinder head, forms to form tapped hole; Screw hole on the steel plate is reamed, so that the diameter of the screw hole on the steel plate is greater than the tapped hole diameter of cylinder head; Utilize screw that the interior edge face of steel plate and cylinder head is tightened together.
Described method can comprise that also described screw is a sunk screw with the formation of the through hole on steel plate counter sink, and the head of described screw does not exceed the plane of steel plate.
The degree of depth of the counter sink of processing on cylinder head is four times of pitch of screw.
Described method also can be included in utilizes screw that the interior edge face of steel plate and cylinder head is tightened together before with screw thread washing agent cleaning screw hole.
Described method also can be included in utilizes screw to smear the thread locking agent before the interior edge face of steel plate and cylinder head is tightened together on screw.
Described method also can be included in utilizes screw screw and steel plate is spot-welded together after the interior edge face of steel plate and cylinder head is tightened together, and processes the plane of steel plate then.
The flatness on the plane of the steel plate after the processing can be ± 0.5mm.
When by welding the interior edge face of steel plate and cylinder head being fixedlyed connected coaxially, the material of described cylinder head and steel plate is cast steel or Q235.
The step of the interior edge face of steel plate and cylinder head being fixedlyed connected coaxially by welding further comprises: drill through the hole at a certain distance on steel plate; Steel plate is placed on the interior edge face of cylinder head and adjusts the position, symmetrically steel plate and cylinder head are welded together in the through hole, wherein, outside the outstanding steel plate of overlap; Remove welding slag.
The invention has the beneficial effects as follows: reduce the clearance volume of unit, increased the unit air displacement, improved unit efficiency.For multi-level piston formula compressor, intergrade and final stage cylinder clearance volume reduce, and can reduce the delivery temperature and the exhaust pressure of unit upper level cylinder, optimize the performance of unit.Processing method is simple, less investment, and the transformation cycle is short.Steel plate is after bolton, and each coupling of increase does not directly weld with cylinder cap, and cylinder cap does not drill through the hole, does not influence body structure and the Safety performance of cylinder cap as pressure-vessel, does not influence the working life of cylinder cap.Steel plate is inboard and outer surface is smooth, and unit is when normal operation, and clamping bolt is not subjected to shear action, and suffered tensile stress and pressure stress are very little, have improved reliability, have guaranteed the safe and reliable operation of unit.
Description of drawings
By the description of carrying out below in conjunction with the accompanying drawing that an example exemplarily is shown, above and other objects of the present invention and characteristics will become apparent, wherein:
Fig. 1 is existing piston type compressor cylinder lid scheme of installation;
Fig. 2 is according to piston type compressor cylinder lid profile schematic representation of the present invention;
Fig. 3 arranges schematic representation according to cylinder head sunk screw of the present invention;
Fig. 4 is according to cylinder head partial enlarged drawing of the present invention.
Be labeled as among the figure: cylinder head 1, steel plate 2, sunk screw 3, cylinder block 4, air valve 5, piston 6, piston rod 7.
Embodiment
Below, describe embodiments of the invention in detail with reference to accompanying drawing.
As shown in Figure 1, in the prior art, piston compressor comprises cylinder head 1, cylinder block 4, piston 6 and piston rod 7.One end of cylinder block 4 is openings, and cylinder head 1 is installed in the opening end of cylinder block 4 hermetically.Piston 6 is housed inside in the cylinder block 4, and piston rod 7 is connected with piston 6, and passes the other end of cylinder block 4, thus drive piston 6 in cylinder block 4 to-and-fro motion with the gas in the pressurized gas cylinder body 4.On the wall of cylinder block 4, also be provided with air valve 5, with will by will be compressed gas introduce in the cylinder and and discharge compressed gas.In addition, the inside of dissimilar cylinder head can have cooling water chamber or air chamber, can be formed with water intake (or suction port) 11 and water outlet (air outlet) 12 on cylinder head.
2 to Fig. 4 describe below with reference to accompanying drawings according to method for reducing end face clearance volume of piston type compressor cylinder of the present invention.Fig. 2 is according to piston type compressor cylinder lid profile schematic representation of the present invention; Fig. 3 arranges schematic representation according to cylinder head sunk screw of the present invention; Fig. 4 is according to cylinder head partial enlarged drawing of the present invention.
At first, according to the clearance volume that the diameter and the needs of cylinder head 1 interior edge face are eliminated, calculate the thickness and the processing and fabricating steel plate 2 of steel plate.Steel plate should adopt Q235 or 16Mn steel plate.Preferably, about the little 5mm of radius of the inwall of the radius ratio cylinder head of steel plate 2, preferably the seamed edge to steel plate carries out rounding, or carries out 45 ° of chamferings.
Then, the interior edge face of the steel plate that processes 2 with cylinder head 1 is fixed together coaxially.Wherein, steel plate 2 can be connected by screw ground with cylinder head 1.
To introduce in detail below and utilize screw steel plate 1 and cylinder head 1 interconnected step.
At first, the steel plate 2 that processes is placed on the interior edge face of cylinder head 1, adjusts the position, drilling positions, and to prevent steel plate 2 and cylinder head 1 relative displacement takes place.
On steel plate 2 and cylinder head 1, join the drilling screw hole at a certain distance, for example, on steel plate 2, drill through the hole, on cylinder head 1, bore counter sink.The degree of depth of drilling is decided according to the thickness of cylinder head on cylinder head, and drilling depth is advisable with four times of pitch, causes the cooling chamber on the cylinder head 1 to be drilled and leak in case the drilling degree of depth is excessive.Described screw hole preferably forms according to proportional spacing as shown in Figure 3.
Then, in the counter sink of cylinder head 1, carry out tapping.After tapping, available drill bit carries out chamfered to the screw hole of steel plate 2, and makes the head of the sunk screw 3 after the installation be no more than the steel plate plane.In addition, also can use the screw of other type, but the head of the screw after installing preferably is no more than the steel plate plane.
In addition,, can ream, so that the tapped hole diameter on the steel plate 2 is greater than the tapped hole diameter on the cylinder head 1 to steel plate 2 according to the tapped hole diameter on the cylinder head 1.In order to prevent that the machining detritus from entering in the cylinder block 4, available screw thread washing agent cleans screw hole.After drying screw hole, on sunk screw 3, smear the thread locking agent, with sunk screw 3 fastening steel plate 2 and cylinder head 1, it is good that it is fitted.
After the steel plate 2 that links together and cylinder head 1 solidified 24 hours, each sunk screw 3 of spot welding and steel plate 2 prevented that loosening phenomenon from taking place, and surface finish is smooth.
Adopt the steel plate 2 on the suitable machining process processing cylinder head 1, make surface smoothness reach ± requirement of 0.5mm is advisable.
Have or not the piston type compressor cylinder lid of cooling water chamber, air chamber all can adopt the method to reduce the cylinder head clearance volume.
Though the mode that the invention discloses to be threaded increases the method that steel plate reduces end face clearance volume of piston type compressor cylinder on the interior edge face of cylinder head, the invention is not restricted to this.When cylinder head and steel plate are the good steel of weldability such as cast steel or Q235, can adopt the mode of welding that steel plate is connected on the interior edge face of cylinder head.Concrete grammar is: drill through the hole at a certain distance on steel plate 2, the steel plate 2 that processes is placed on the interior edge face of cylinder head 1, adjust the position, steel plate 2 and cylinder head 1 are welded together in the through hole with electric soldering method, overlap must not be given prominence to steel plate 2, in case overlap contacts the cylinder accident of hitting that produces with piston, welded the back and removed clean welding slag, used in the process of this method, should be symmetrically welded according to the deployment scenarios of through hole on the steel plate 2, the strict guarantee welding procedure is to reduce the generation of thermal stress.
The steel plate that the method according to this invention increases does not bear the effect of inertial force not with piston motion, and joining method is reliable, processing and fabricating is simple, and cost is low, long service life, the slow-speed of revolution and high-revolving unit all are suitable for, can improve compressor bank efficient, reduce the unit specific power, increase the unit air displacement, reduce the delivery temperature of unit upper level, optimize unit performance, improve the unit operation reliability, in the maintenance of piston compressor, the application prospect that the use industry has outbalance.
The invention is not restricted to the foregoing description, without departing from the present invention, can carry out various changes and modifications.
The content of this specification all is contained in this.
Claims (12)
1, a kind of method for reducing end face clearance volume of piston type compressor cylinder, described piston type compressor cylinder has cylinder block, cylinder head, piston and piston rod, piston is to-and-fro motion in cylinder block under the drive of piston rod, it is characterized in that described method comprises:
Calculate the diameter of steel plate according to the diameter of cylinder head interior edge face, the clearance volume of eliminating is calculated the thickness of steel plate as required;
Steel plate is processed into the shape of being calculated;
Utilize screw or pass through welding the interior edge face of steel plate and cylinder head is fixedlyed connected coaxially.
2, the method for claim 1 is characterized in that the little 5mm of radius of interior edge face of the radius ratio cylinder head of described steel plate.
3, the method for claim 1 is characterized in that the material of described steel plate is Q235 or 16Mn when utilizing screw that the interior edge face of steel plate and cylinder head is fixedlyed connected coaxially.
4,, it is characterized in that utilizing the step that screw is fixedlyed connected the interior edge face of steel plate and cylinder head coaxially further to comprise as each the described method in the claim 1 to 3:
Steel plate is placed on the interior edge face of cylinder head, adjusts after the position, at the corresponding position of steel plate and cylinder head drilling to position;
On steel plate and cylinder head, join the drilling screw hole by proportional spacing, and the screw hole on the cylinder head is processed into counter sink;
Carry out tapping in the counter sink that on cylinder head, forms to form tapped hole;
Screw hole on the steel plate is reamed, so that the diameter of the screw hole on the steel plate is greater than the tapped hole diameter of cylinder head;
Utilize screw that the interior edge face of steel plate and cylinder head is tightened together.
5, method as claimed in claim 4 is characterized in that the through hole on the steel plate is formed counter sink, and described screw is a sunk screw, and the head of the screw that is mounted does not exceed the plane of steel plate.
6, method as claimed in claim 4, the degree of depth that it is characterized in that the counter sink processed on cylinder head are four times of pitch of screw.
7, method as claimed in claim 4 is characterized in that cleaning screw hole with the screw thread washing agent before the interior edge face that utilizes screw with steel plate and cylinder head tightens together.
8, method as claimed in claim 4 is characterized in that smearing the thread locking agent on screw before the interior edge face that utilizes screw with steel plate and cylinder head tightens together.
9, method as claimed in claim 4 is characterized in that after the interior edge face that utilizes screw with steel plate and cylinder head tightens together screw and steel plate is spot-welded together, processes the plane of steel plate then.
10, method as claimed in claim 9, the flatness on the plane of the steel plate after it is characterized in that processing is ± 0.5mm.
11, method as claimed in claim 1 or 2 is characterized in that the material of described cylinder head and steel plate is cast steel or Q235 when by welding the interior edge face of steel plate and cylinder head being fixedlyed connected coaxially.
12, method as claimed in claim 1 or 2 is characterized in that further comprising by the step that welding is fixedlyed connected the interior edge face of steel plate and cylinder head coaxially:
On steel plate, drill through the hole at a certain distance;
Steel plate is placed on the interior edge face of cylinder head and adjusts the position, symmetrically steel plate and cylinder head are welded together in described through hole, wherein, outside the outstanding steel plate of overlap;
Remove welding slag.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910167443A CN101634289A (en) | 2009-08-21 | 2009-08-21 | Method for reducing end face clearance volume of piston type compressor cylinder |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200910167443A CN101634289A (en) | 2009-08-21 | 2009-08-21 | Method for reducing end face clearance volume of piston type compressor cylinder |
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| Publication Number | Publication Date |
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| CN101634289A true CN101634289A (en) | 2010-01-27 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200910167443A Pending CN101634289A (en) | 2009-08-21 | 2009-08-21 | Method for reducing end face clearance volume of piston type compressor cylinder |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758729A (en) * | 2014-02-13 | 2014-04-30 | 天津凯德实业有限公司 | Piston device |
| CN111622930A (en) * | 2020-06-30 | 2020-09-04 | 广西玉柴机器股份有限公司 | Method and structure for reducing air displacement of air compressor |
-
2009
- 2009-08-21 CN CN200910167443A patent/CN101634289A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103758729A (en) * | 2014-02-13 | 2014-04-30 | 天津凯德实业有限公司 | Piston device |
| CN111622930A (en) * | 2020-06-30 | 2020-09-04 | 广西玉柴机器股份有限公司 | Method and structure for reducing air displacement of air compressor |
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Open date: 20100127 |