EP0745772B1 - Pressure generating device - Google Patents

Description

The invention relates to a device for generating a pressure, in particular for Use as an air pump or floor compressor, with a multi-stage Housing which has a valve connection and wherein in the housing at least one first and second coaxially arranged pressure chamber is formed, the volume of which can be changed by one piston each and only by one Effective direction of movement seal are interconnected, the second pressure chamber from two to one another via a connecting channel in Active coaxial partial pressure chambers exist in the radial direction are separated by a piston cylinder sleeve (13, 14), the piston surfaces acting on the two partial pressure spaces relative to one another and are movable relative to the piston cylinder sleeve.

Devices for generating a pressure, for example a water, oil or Air pressure is becoming diverse both in the home and in industry used and needed. The best known version of the aforementioned device To generate a pressure is an air pump, for example Increasing the air pressure in the tires of a bicycle is required, each Different connection valves are available depending on the intended use. For Motor vehicles or other frosted vehicles are usually Schrader valves used while a Dunlop or bicycle tire Have a slave valve. The pressure to be applied by the device is directed depends essentially on the type of vehicle and the load, being a appropriate force is required to compress the air. The wheels a bicycle is usually with 3 to 6 bar, that of a motor vehicle with 2 pumped up to 3 bar and that of a racing bike with up to 8 bar, so that with one manually operated device to achieve the desired final pressure only with additional technical measures are possible. The ones on the market Air pumps either consist of a one-stage version, which is only one Pressure chamber and a piston that the air when inserting the piston compressed and via a seal and a connection valve of the pump Tires allow filling or from a two-stage version, which one first pressure room to Pre-compress the air and a second connected to it Has pressure room in which the air to a maximum final value is compressed. Because of the large volume of the first The first variant is a large stroke with little effort necessary and a correspondingly high force to reach the final pressure, the effort increases steadily to increase the air in the pressure chamber compress. In the second variant, however, there is less force necessary because the two pressure rooms each have a smaller volume have and work alternately, but the Force to the final pressure steadily and the forces can be one Child or an elderly person. The force is here essentially by the piston area and the volume of the pressure chamber certainly.

DE-PS 89 263 describes, for example, an air pump with several superimposed cylinders with an axial arrangement of the individual pressure rooms, the pressure rooms via a in the longitudinal direction extending channel are interconnected. So here it is to a three-stage version of an air pump, whereby by the respective Channels a permanent operative connection between the individual pressure rooms is made so that there is no pre-compression and end-compression. This Air pump has the disadvantage that the entire piston surface to be moved is very large, so that a high effort to generate the final pressure is required, which complicates handling and moreover that Achieving high final pressures makes it almost impossible.

From WO 91/02159 a bicycle pump is known, which in the Seat post can be installed and two axially arranged Has pressure spaces, which by a piston guided in the tubular jacket are separated from each other. This two-stage housing design is relative simply constructed and therefore also requires a lot of effort.

From GB 586,459 is also a device for generating a pressure known, which also has a two-stage housing design. The Pressure chambers are also arranged axially here, the sliding into one another Sleeves in the middle area of the second pressure chamber divided into two partial pressure rooms becomes. The two partial pressure chambers are interconnected by a radial bore connected so that they are in constant operative connection. The two cylindrical housing parts are shifted against each other, so that a simultaneous and dependent loading of the two partial pressure spaces takes place. As a result, a very large piston area is also effective overall, which means that very high effort is required to generate the final pressure. This does the operation difficult and also limits the achievable final pressure, so that this version is also disadvantageous.

The invention has for its object a device for generating a To create pressure, which achieves a higher final pressure up to 8 bar with reduced effort required.

According to the invention it is provided that the Connecting channel runs axially in the piston cylinder sleeve (13, 14) and that.

The division of the second pressure chamber into two partial pressure rooms, in which the Compression up to the highest maximum value results in a Formation of two pistons, which are approximately half the piston size of a single piston. Through the Dividing the piston arrangement into two and reducing the piston area is the effort required to generate the final pressure reduced, to which the effort remains the entire length of the stroke is the same because only one of the Piston surfaces are effective during compression and through the pressure equalization within the two partial pressure rooms a continuous pressure increase in both partial pressure rooms is achieved and thus the achievement of a much higher final pressure and the application of Device also by a less powerful person is possible.

To the axial and radial size of the pump device It is intended to be kept as low as possible that the Arrangement of the pressure rooms is such that in the inserted position the two partial pressure rooms are coaxially arranged and their largest Have volume and the first pressure chamber the smallest Has volume and that in the extended position both partial pressure rooms have their smallest volume and the first pressure chamber has the largest volume.

In a further embodiment of the invention, that the walls of the pressure rooms consist of several coaxially arranged There are sleeves which can be inserted into one another are, the sleeves parts of the multi-stage housing form and the pressure spaces between the individual sleeves are arranged.

In a special embodiment of the invention, that the middle sleeve, which is the first pressure chamber and separates the two partial pressure rooms from each other, double-walled is executed and at least one axial Connection channel of the two spatially separated Has partial pressure rooms. Through the connecting channel double-walled middle sleeve is the one Pressure equalization between the two partial pressure rooms guaranteed and on the other hand the radial size unaffected.

To further reduce the size and use of the maximum printing volume is provided that the sleeves at least at one end an inside or outside Collar or ring-shaped approach, which the piston of the coaxially adjacent pressure chamber forms. The respective collar or neck slides on the Inner or outer surface of the adjacent sleeve and is possibly via a sealing ring, for example an O-ring, additionally sealed so that a nested one cylindrical sleeve arrangement arises, whereby the pressure spaces are formed between the individual sleeves are. The collar or lugs can be made in one piece molded onto the sleeves or screwed to them, glued or welded.

A reduction of the effort is with the two-stage technology achieved in that when sucking the Medium in the first pressure chamber at the same time Compression of the two partial pressure rooms with one outlet of the medium under increased pressure via the valve connection he follows.

A connection between the two different ones Pressure rooms during pre-compression or one Sealing between the two pressure rooms during the Compression in the second pressure chamber is achieved that the seal between the first and the two second partial pressure rooms made of a floating O-ring exists, which is due to a shift to a ring approach the first pressure chamber when the medium is sucked in and seals the two partial pressure chambers against each other and which while compressing the medium at the same time pressure equalization is guaranteed in the two partial pressure rooms and in the opposite case the seal between the first and the two partial pressure rooms by a lateral shift into a free space during pre-compression of the medium in the first pressure chamber Passage to the second pressure chamber opens. The change of the O-ring between the free space and the ring shoulder is in each case by reversing the movement of the device initiates and ensures automatic closing or opening the two pressure chambers to each other.

In a further embodiment of the invention, that the first pressure chamber has a valve inlet via a one-way valve and the two second partial pressure rooms one Have outlet opening for valve connection.

In a further embodiment of the invention, that the valve connection axially or radially from the multi-stage housing is brought out, with one radial arrangement the compressed medium immediately via a valve connection of the outer housing part can be derived. While in the axial arrangement of the Valve connection a connecting channel in the axis closest sleeve to the valve connection necessary is, this does not apply to a radial arrangement of the Valve connection because the valve connection is immediate attached to the outer sleeve or molded in one piece can be.

For inexpensive manufacture of the middle sleeve provided that this consists of two parts, which are screwed or glued. For an additional To achieve sealing between the individual sleeves, it is provided that between the individual sleeves Sealing a groove with an O-ring or a lip seal is arranged.

In order to use the device in a versatile manner, that the valve outlet of the two partial pressure spaces over there is an adapter housing which has a multifunctional connection represents and various valve connections contains, optionally and individually via a Sealing element with the second pressure chamber or Partial pressure rooms are connectable.

The invention is further illustrated by the figures explains:

Fig. 1

eine Griffkappe der Vorrichtung in einer geschnittenen Seitenansicht,

Fig.2

eine Zylinderhülse in einer geschnittenen Seitenansicht zur Aufnahme in die Griffkappe,

Fig.3

das erste Teil einer Kolbenzylinderhülse in einer geschnittenen Seitenansicht,

Fig.4

das zweite Teil einer Kolbenzylinderhülse in einer geschnittenen Seitenansicht,

Fig.5

eine Kolbenhülse in einer geschnittenen Seitenansicht,

Fig.6

eine Griffkolbenhülse in einer geschnittenen Seitenansicht mit einstückig angeformten Adaptergehäuse und in einem Schnitt I-I,

Fig.7

eine Hülse in einer geschnittenen Seitenansicht und in einem Schnitt II-II für das Adaptergehäuse,

Fig.8

eine Vorrichtung nach der Montage in einer geschnittenen Seitenansicht sowie einen Schnitt gemäß der Verbindungslinie III-III,

Fig.9

zwei vergrößerte Teilansichten der Vorrichtung sowie ein Schnitt gemäß der Verbindungslinie IV-IV und V-V und

Fig.10

eine zweite Ausführungsform der Pumpenvorrichtung in einer teilweise geschnittenen Seitenansicht.

It shows

Fig. 1

a handle cap of the device in a sectional side view,

Fig. 2

a cylinder sleeve in a sectional side view for inclusion in the handle cap,

Fig. 3

the first part of a piston cylinder sleeve in a sectional side view,

Fig. 4

the second part of a piston cylinder sleeve in a sectional side view,

Fig. 5

a piston sleeve in a sectional side view,

Fig. 6

a grip piston sleeve in a sectional side view with integrally molded adapter housing and in a section II,

Fig. 7

a sleeve in a sectional side view and in a section II-II for the adapter housing,

Fig. 8

a device after assembly in a sectional side view and a section along the connecting line III-III,

Fig. 9

two enlarged partial views of the device and a section along the connecting line IV-IV and VV and

Fig. 10

a second embodiment of the pump device in a partially sectioned side view.

Figures 1 to 6 show the various items a device 1 for generating a pressure, as they is shown in Figure 7 after assembly and for Use for example as an air pump is provided.

Figure 1 shows a handle cap 2, which consists of a cylindrical Sleeve 3 with a closed end wall 4 consists. In the end wall 4 is in a stepped bore 5 a seal is inserted, which consists of a valve plate 6 and a valve holder 7 which holds the valve plate 6 fixed in the end wall 4. Through the stepped bore 5 the outside air gets into the first pressure chamber of the device 1, the valve plate 6 works as a check valve and an axial Game for releasing the stepped bore 5. At the The compression process, however, becomes the valve plate 6 to the shoulder to the smaller diameter of the stepped bore 5 pressed and closes the first pressure chamber 8 to the surrounding outside air, which is inside the sleeve 3 is arranged. It is conceivable that instead of the valve plate 6 another form of seal is used. In the open end 9 of the grip cap 2 becomes that in FIG. 2 shown cylinder sleeve inserted, which in turn closed by further sleeves or a handle piston sleeve is.

Figure 2 shows a cylinder sleeve 10, which as the outer Intermediate sleeve of the telescopic device 1 used becomes. The cylinder sleeve 10 has one end 11 an inwardly directed annular extension 12, which in connection with the coaxial inside Piston cylinder sleeve, as shown in Figures 3 and 4 is a guide for the piston cylinder sleeve and at the same time a radial closure for closing of the first of the two partial pressure rooms.

The piston-cylinder sleeve consists of two parts 13, 14, which are shown in Figures 3 and 4. Figure 3 shows the first part 13 of the piston-cylinder sleeve in the cylinder sleeve 10 inserted during assembly is that the cantilevered ends are arranged opposite are. The first part 13 of the piston-cylinder sleeve consists of a tubular piece attached to one End is partially closed by an end wall 15. The end wall 15 has a two-stage bore 16, which with their largest diameter to accommodate the second part 14 of the piston cylinder sleeve is provided, while the smaller part of the stepped bore 16 for Inclusion of another piston sleeve, as shown in Figure 5 is shown, is provided. The opposite End of the first part 13 of the piston cylinder sleeve open and has an outer radial shoulder 17 which has a plurality of channels 18 distributed around the circumference.

FIG. 4 shows the second part 14 of the piston-cylinder sleeve, which is inserted into the first part 13 during assembly becomes. The end 19 of the second part 14 of the Piston cylinder sleeve has an inward facing annular approach 20 on a hole size has that the outer diameter of that shown in Figure 5 Piston sleeve is adjusted. Forms at the same time the approach 20 the piston for the partial pressure space between the piston-cylinder sleeve and the piston sleeve is formed. The other end 21 of the second part 14 the piston-cylinder sleeve has an outwardly directed Approach 22, whose outer diameter to the outer diameter the approach 17 of the first part 13 of the Piston cylinder sleeve is adapted and within the Cylinder sleeve 10 is guided after assembly. The second end 21 of the piston-cylinder sleeve is open and serves to accommodate the piston sleeve shown in Figure 5. Behind the neck 22 is on the outer jacket the piston cylinder sleeve 13, an annular shoulder 23 which is put on a floating O-ring, the one has axial freedom of movement and as a sealing element between the first and the second two partial pressure rooms is provided. The two parts 13, 14 of the Piston cylinder sleeve are pushed into each other and for example glued, welded or screwed, after the assembly the inner piston-cylinder sleeve 13 relative to the outer part 13 of the piston-cylinder sleeve protrudes and between approaches 17 and 22 the O-ring is guided axially. Just like approach 17 the approach 22 has circumferentially distributed channels 24 which a pressure equalization between the two pressure chambers allow, provided there is no sealing by the O-ring he follows. A seal through the O-ring between the two pressure rooms always takes place when in the first pressure chamber air is sucked in while the Sealing is released when pre-compression the air takes place in the first pressure chamber. Independent of The position of the O-ring exists between the two partial pressure rooms an active connection by at least one Connection channel 59 in the form of a longitudinal groove on the Outer circumference of the second part 14 of the piston-cylinder sleeve, that always stays open.

Figure 5 shows a piston sleeve 25, which in the inner Part 14 of the piston-cylinder sleeve can be inserted. The Piston sleeve 25 has an open end 26, which in a bore of the grip piston sleeve, as shown in FIG. 6 is shown, glued, screwed or welded becomes. The second end 27 is also open and is closed by a piston ring 28, which is inserted with an approach into the piston sleeve 25 and glued, welded or alternatively is screwed. The piston ring 28 has on its outer circumference a groove 29 with an O-ring 30, which after assembly, seal the inner part 14 causes the piston-cylinder sleeve. Through the hole the piston sleeve 25 is fed through Air to a valve connection, such as in the grip piston sleeve from Figure 6 is provided. Further points the piston ring 28 behind the O-ring 30 in the direction on the piston sleeve 25 a radial connecting channel 31, which is connected to an axial bore 32 is that via a seal 33 to the interior of the Piston sleeve 25 is connected. Acting with the seal it is in turn a one-way valve, which one Compressed air outlet in the direction of the valve connection allowed and with a corresponding back pressure automatically closes the bore 32. The seal consists of an elastic valve plate 33 and one Valve bracket 34, which the valve plate 33 axially movably fixed in the bore 32. Alternatively there is here, too, the possibility of using a different one-way valve.

Figure 6 shows a handle piston sleeve 36 and an adapter housing 37 in a sectional side view and a cut I-I. The adapter housing 37 is in one piece connected to the grip piston sleeve 36 of the device 1. Alternatively, you can use two parts and glue or weld them together. The Handle piston sleeve 36 consists of a hollow cylindrical Section 38 with an open end 39 into which the Cylinder sleeve 10 can be inserted. To the second end 40 the grip piston sleeve 36 is the adapter housing 37 in one piece molded, which consists of an annular Approach that has multiple holes or breakthroughs consists. An axially arranged bore 41 opens out in the cylindrical portion 38 of the grip piston sleeve 36, the rear part of the bore 41 being a larger one Has gradation 42, in which the piston sleeve 25 with its open end 26 can be inserted. The piston sleeve 25 is also glued to the adapter housing 37 or welded to ensure adequate sealing achieve. In the adapter housing 37 are, as from the Section I-I can be seen, a total of 4 recesses 43 incorporated, which are offset by 90 ° to each other are arranged. However, it is conceivable that a larger one Number of recesses 43 on the circumference of the adapter housing 37 are arranged. The recesses 43 are in their rear part is rectangular or round executed, with three of the recesses 43 via one Connection channel 44 connected to the central bore 41 are. The size of the recesses 43 and that of the connecting channel 44 is in each case different Adjusted valve connections, with each recess 43rd an appropriate rubber seal is inserted during assembly becomes. Depending on the valve connection used, there is the connecting channel 44 from a small hole or from a major breakthrough that i.a. the introduction the valve stem up to the inner bore 41, to the size of the device 1 and the To reduce adapter housing 37. The fourth recess 43 has no connection to the central Bore 41 on, because in this recess 43 Push button is inserted, which is a locking of the Adapter housing 37 allows. In the locked position are to avoid contamination or the penetration of dirt particles into the pressure chambers the different outlet openings through the in the Figure 7 shown closed sleeve. Furthermore, in the adapter housing 37 has a longitudinal groove 45 and an annular groove 46 incorporated, which for guiding one on the sleeve molded approach is provided. The sleeve can with the approach are pushed through the longitudinal groove 45 and twisted into any position by the annular groove 46 be, the position by a on the adapter housing 37 molded nose 47 can be locked. The Nose 47 engages in a star-shaped groove in the sleeve Lock on.

Figure 7 shows a plan view and in a section Side view II - II a sleeve 48 which is coaxial can be pushed onto the adapter housing 37. The Sleeve 48 has an opening 49, which depending on Rotary position of the sleeve 48 releases one of the recesses 43 or a latching of the locking button enables. On the inside of the sleeve 48 is a Approach 50 formed, which in the longitudinal groove 45 or in the annular groove 46 of the adapter housing 37 is guided. The Approach 50 prevents, with the exception of a certain rotational position, withdrawing the sleeve 48 from the adapter housing 37. The end of the sleeve 48 facing away from the shoulder 50 is closed by a wall 51 with an end face 52. On the inside of wall 51 is a circular one Form 53 formed by a Segment ring extension 54 is extended. The segment ring approach 54 extends approximately over a three-quarter circle, its opening with the opening 49 of the sleeve 48th flees. On the segment ring shoulder 54 is a sealing element pushed on and used to seal the various Outlet openings used. To the approach 53 there is a groove 55 on the wall 52, which receives the annular collar of the sealing element. There is a central one in the end face 52 Bore 56, which extends into the neck 53 and through a small connecting channel 57 with the bore 56 of the segment ring projection 54 is connected. In the Approach 53 is also a recess 58 incorporated, which for receiving a seal for the bore 56th is provided. The bore 56 is through the seal sealed against the two second partial pressure rooms and serves to accommodate, for example, a hose connection, with which a connection to any other Valve connections can be created which for example, are difficult to access.

Figure 8 shows a sectional side view and a section III - III the device 1 after assembly and FIG. 9 shows in two sectional partial views the floating O-ring 60 in two different Positions as well as the radial arrangement of the sleeves in two cut top views.

The outer parts of the device consist of the Handle cap 2 and the handle piston sleeve 36 with one piece molded adapter housing 37, which by the coaxial arranged sleeve 48 is closed or the selection one of the outlet openings allows. When pulling apart is also the first part 13 of the piston-cylinder sleeve and the piston sleeve 25 visible. In the inserted The condition of the sleeves is coaxial arranged, from the outside inwards according to the handle cap 2 and the grip piston sleeve 36 the cylinder sleeve 10, the piston-cylinder sleeve 13, 14 and Piston sleeve 25 follows. The grip cap 2 has in her End wall 4 a stepped bore 5 with a valve plate 6 and a valve holder 7, which for suction the outside air is provided in the first pressure chamber. However, the pressure chamber is in the retracted position not recognizable, but only opens when pulled apart the device 1 between the piston ring 28 and the inside of the end wall 4 and is radially through the Cylinder sleeve 10 limited. To seal the first Pressure chamber is located in the piston ring 28 on the one hand a groove 29 with an O-ring 30 and the other a floating O-ring 60 is provided, which at Pulling the device 1 apart on a ring approach 23 is pushed and the channel or channels 24 between closes the first and the two partial pressure spaces 61, 62. When pressed together, however, the O-ring 60 axially shifted into an annular space 63, so that a connection between the first pressure chamber and the two second partial pressure rooms 61, 62 via the channel 24 and the connecting channel 59 and a channel 78 exists while the first pressure chamber through the valve plate 6 is sealed to the outside and pre-compression is possible. During pre-compression the flows Air simultaneously through duct 24 and the connecting duct 59 and at least one further channel 78, which on the inner surface of the neck 20 of the second Part 14 of the piston-cylinder sleeve is formed in the two second partial pressure spaces 61, 62, which on the one hand between the cylinder sleeve 10 and the first part 13 of the piston-cylinder sleeve and on the other hand between the second part 14 of the piston-cylinder sleeve and the Piston sleeve 25 are formed. Radially closed the two second partial pressure spaces are sealed 61, 62 through the neck 12 of the cylinder sleeve 10 and outer radial projection 22 of the second part 14 of the Piston-cylinder sleeve with the O-ring 60 when sucking in Outside air or through the inner radial extension 20 of the second part 14 of the piston-cylinder sleeve and the end wall 15 of the first part 13 of the piston-cylinder sleeve and the piston ring 28, with a better seal in the neck 12 an inner groove 64 with an O-ring 60 and in the end wall 15 an inner groove 66 with an O-ring 67 was provided. The bore 16 and the radial Approaches 12, 20 and approaches 17, 22 form the respective guidance of the coaxially adjacent sleeve, wherein approaches 12, 20 and 22 with O-ring 60 at the same time Form pistons for the partial pressure chambers 61, 62 and one Compression of the air in the two partial pressure rooms 61, 62 enable. The partial pressure chamber 62 is via a connecting channel 31 and a bore 32 with the interior 68 of the piston sleeve 25 connected, which in turn with its open end in the bore 41 of the adapter housing 37 opens. To prevent the expelled air can flow back again, the bore 32 is through a One-way valve in the form of a valve plate 34 and one Valve holder 35 closable, which is when compressing the air in the two partial pressure rooms 61, 62 due to the overpressure opens and an air outlet to the adapter housing 37 allows. The compression always takes place in the two partial pressure rooms 61, 62 instead of pulling the device 1 apart and at the same time the outside air in the first pressure chamber can flow in.

The adapter housing 37 of the device 1 is additional shown in section III - III after assembly. From the sectional view it can be seen that in the Recesses 43 of the adapter housing 37 in the upper Position a push button 69 with one in a blind hole 70 lying spring 71 is inserted, while in the right and lower recess 43 a seal 72, or 73 is inserted. The left recess 43, however, is free and serves to accommodate a separate adapter. The opening is in the rotational position of the sleeve 48 49 aligned upwards so that the push button 69 through the opening 49 through the spring 71 can be pushed outwards. The seals 72, 73 are additionally closed by the sleeve 48 to prevent contamination to avoid and restores the locking position the device 1, in which none of the Outlet openings connected to the partial pressure chambers 61, 62 is. The seal against the partial pressure rooms 61, 62 takes place through a sealing element 74, which pushed onto the segment ring shoulder 54 of the sleeve 48 and with its open segment cutout 75 in the direction points to the push button 69. With a twist the sleeve 48 is connected in one piece to the sleeve 48 Segment ring shoulder 54 rotated so that the segment cutout 75 of the sealing element 78 in the direction is twisted onto the outlet openings and at the same time a connection to the partial pressure rooms 61, 62 will be produced. The existing in the end face 52 Bore 56 is through the end face 76 of the sealing element 74 sealed so that for all outlet openings the adapter housing 37 only a single sealing element 74 is required. Alternatively, there is Possibility of bore 56 through a separate seal to seal. The seal can be extended here Approach of a connectable adapter or Pressure gauges are pressed inwards so that a connection to the partial pressure rooms 61, 62 is produced. The sealing element 74 itself is on the annular Approach 53 of the sleeve 48 pushed and lies with his Collar 77 in the annular groove 55, so that the partial pressure spaces 61, 62 relative to the sleeve 48 are sufficient are sealed.

The position of the O-ring 60 is again shown in FIG an enlarged and sectional partial view of the Device 1 in a sealing position in the upper Representation and in an open position in the shown below. The O-ring 60 has an axial play and can from the sealing position on the ring shoulder 23 of the second part 14 of the piston-cylinder sleeve, which when pulling the device apart 1 is reached in an opening position in pass over the free space 63 when the device 1 is pushed together becomes. In the open position, the Channel 24 for connecting the pressure chambers 8 and 61, 62 Approved.

The radial is from the sections IV - IV and V - V Arrangement of the sleeves and that of the connecting channels between the pressure rooms 8 and 61, 62 again in detail evident. Are also in the sectional views the channels 18, the connecting channels 59 and the Channel 78 recognizable, which is a pressure equalization between enable the two partial pressure rooms 61, 62.

FIG. 10 shows a sectional view another embodiment of the invention in the form of a device 100, which are used as a floor compressor can and compared to the previous embodiment has the following deviations. The device 100 has a single outlet opening, which is radial integrally formed on an outer cylinder sleeve 101 , the outlet opening having a recess 102, which through a stepped bore 103 with the partial pressure chamber 61 is directly connected, for Sealing a one-way valve is provided, which consists of a valve plate 104 and a valve holder 105 exists and in the middle part of the stepped bore 103 is arranged. By the position of the outlet opening the connecting channel is omitted directly on the cylinder sleeve 101 to the adapter housing so that the piston sleeve 25 can be replaced by a piston rod 106, which an approach 107 with a groove 108 and an O-ring 109 for sealing. The rest of the technical execution corresponds to that of device 1.

Reference list

1

contraption

2nd

Grip cap

3rd

Sleeve

4th

Front wall

5

Stepped bore

6

Valve plate

7

Valve holder

8th

Pressure room

9

The End

10th

Cylinder sleeve

11

The End

12th

approach

13

first part of the piston-cylinder sleeve

14

second part of the piston-cylinder sleeve

15

Front wall

16

drilling

17th

Radial approach

18th

channel

19th

The End

20th

approach

21

The End

22

approach

23

Ring approach

24th

channel

25th

Piston sleeve

26

The End

27

The End

28

Piston ring

29

Groove

30th

O-ring

31

Connecting channel

32

drilling

33

poetry

34

Valve plate

35

Valve holder

36

Grip piston sleeve

37

Adapter housing

38

section

39

The End

40

The End

41

drilling

42

gradation

43

Recess

44

Connecting channel

45

Longitudinal groove

46

Ring groove

47

nose

48

Sleeve

49

breakthrough

50

approach

51

wall

52

Face

53

approach

54

Segment ring approach

55

Groove

56

drilling

57

Connecting channel

58

Recess

59

Connecting channel

60

O-ring

61

Partial pressure room

62

Partial pressure room

63

free space

64

Groove

65

O-ring

66

Groove

67

O-ring

68

inner space

69

Push button

70

Blind hole

71

feather

72

poetry

73

poetry

74

Sealing element

75

Segment cutout

76

Face

77

collar

78

channel

100

contraption

101

Cylinder sleeve

102

Recess

103

Stepped bore

104

Valve plate

105

Valve holder

106

Piston rod

107

approach

108

Groove

109

O-ring

Claims (14)

1. A device (1, 100) for generating a pressure, particularly for use as a air pump or upright compressor, comprising a multi-stage casing having a valve connection and wherein at least a first (8) and a second coaxially disposed pressure chamber are formed in the casing, the volume of each chamber being variable by a respective piston and the chambers being connected via a seal operative in only one direction of motion, wherein the second pressure chamber comprises two coaxial component pressure chambers (61, 62) operatively connected to one another via a duct (59) and separated in the radial direction by a piston cylinder liner (13, 14), the piston surfaces acting on the two component pressure chambers (61, 62) being movable relative to one another and relative to the piston cylinder liner (13, 14), characterised in that the connecting duct (59) extends axially in the piston cylinder liner (13, 14).
2. A device according to claim 1, characterised in that in the retracted position the two component pressure chambers (61, 62) have their maximum volume and the first pressure chamber (8) has the minimum volume.
3. A device according to claim 1, characterised in that in the extended position the two component pressure chambers (61, 62) have their minimum volume and the first pressure chamber (8) has the maximum volume.
4. A device according to claim 1, characterised in that the walls of the pressure chambers (8, 61, 62) comprise a number of coaxial liners (2, 10, 13, 14, 25) insertable in one another, wherein the liners (2, 10, 13, 14, 25) are parts of the multi-stage casing.
5. A device according to one or more of claims 1 - 4, characterised in that the liners (10, 13, 14, 25, 106) at least at one end have an internal or external collar or annular attachment (12, 17, 20, 22, 107) which forms the piston of the coaxially neighbouring pressure chamber (8, 61, 62).
6. A device according to one or more of claims 1 - 5, characterised in that the collars or attachments (12, 17, 20, 22, 107) are integrally formed on the liners (10, 13, 14, 25, 106) or screwed, stuck or welded thereto.
7. A device according to one or more of claims 1 - 6, characterised in that when the medium is sucked into the first pressure chamber (8), the two component pressure chambers (61, 62) are simultaneously compressed with the medium emerging under increased pressure via the valve connection.
8. A device according to one or more of claims 1 - 7, characterised in that the seal between the first (8) and the two component pressure chambers (61, 62) comprises a floating O-ring (60) which, by displacement on an annular attachment (23) when the medium is sucked in, seals the first pressure chamber (8) from the component pressure chambers (61, 62) and equalises the pressure with simultaneous compression of the medium in the two component pressure chambers (61, 62).
9. A device according to one or more of claims 1 - 8, characterised in that the seal between the first (8) and the two component pressure chambers (61, 62) comprises a floating O-ring (60) which, by lateral displacement into a free space (63), opens a passage to the second pressure chamber or the two component pressure chambers (61, 62) when the medium is precompressed in the first pressure chamber.
10. A device according to one or more of claims 1 - 9, characterised in that the first pressure chamber (8) has a valve inlet via a one-way valve (6, 7) and the two second component pressure chambers (61, 62) have an outlet opening to the valve connection.
11. A device according to one or more of claims 1 - 10, characterised in that the valve connection extends axially or radially out of the multi-stage casing, and in a radial arrangement the compressed medium can be run off directly via a valve connection on the other casing part (101).
12. A device according to one or more of claims 1 - 11, characterised in that the central liner comprises two screwed or stuck parts (13, 14).
13. A device according to one or more of claims 1 - 12, characterised in that a groove (29, 64, 66, 108) with an O-ring (30, 65, 67, 109) or a lip seal is disposed between the individual liners (10, 13, 14, 25, 106) for sealing.
14. A device according to one or more of claims 1 - 13, characterised in that the valve outlet from the two component pressure chambers (61, 62) is via an adapter casing (37) which constitutes a multifunctional connection and contains various valve connections which can be selectively and individually connected to the second pressure chamber or the component pressure chambers (61, 62) via a sealing element (74).

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