Compressor and device for dispensing a medium

Abstract

Compressor (P) for dispensing a medium, in particular tire sealant, which is to be dispensed from a container into a tire, wherein a motor (1) of the compressor (P) is eccentrically connected via a driven gear (4) to a piston rod (5) which moves a piston (6) in a compression chamber (7), characterized in that a transmission gear (3) is connected upstream of the driven gear (4), wherein the driven gear (4) consists of two gear halves (4.1, 4.2), each with a toothing (14.1, 14.2), wherein the toothing (14.1) of one gear half (4.1) extends over one radian measure and the toothing (14.2) of the other gear half (4.2) extends over another radian measure, wherein the transmission gear (3) consists of two superimposed gears (11, 12) which alternately engage with one or the other wheel half (4.1, 4.2) of the output gear (4), and wherein one gear (11) has a larger diameter than the other gear (12).

Description

[0001] The invention relates to a compressor according to the preamble of patent claim 1 and a device for dispensing a medium, in particular tire sealant, which is to be dispensed from a container into a tire, wherein the compressor can be connected to the tire via a line and a connection to the container opens into this line. State of the art

[0002] DE 10 2004 042 911 A1 discloses a device for conveying a gas from a pressure chamber, in particular for discharging a sealant from this container into a vehicle tire and for inflating the tire. A compressor can be connected to the sealant container disclosed therein. This compressor can also be designed as a diaphragm compressor, which compresses the air present in the sealant container to force the sealant out of the sealant container.

[0003] Furthermore, WO 2010 / 066448 A1 discloses a device for conveying a gas from a pressure chamber, in particular for discharging a sealant from this container into a tire of a vehicle and / or for inflating the tire. A piston is arranged in the pressure chamber for oscillating movement. A gear element is also associated with the piston, which converts a rotating movement of the drive shaft of a drive into an oscillating movement.

[0004] The document EP 1 747 878 ​​A1 relates to a device for dispensing a tire sealant from a container in a vehicle tire, wherein the device has a corresponding compressor.

[0005] EP 1 419 876 A2 relates to a method for injecting sealant into a tire in the event of a puncture. Furthermore, this prior art discloses a corresponding device for carrying out such a method and a sealant container.

[0006] The publication DE 10 314 075 A1 relates to a tire inflation device comprising a pressure vessel on which a manually operable valve device is arranged. The valve device also includes a bursting membrane, which is punctured by the valve spindle of the valve device when the valve device is first actuated. The bursting membrane, which remains intact during storage and standby of the tire inflation device, ensures that the pressure in the vessel is maintained over a correspondingly long storage period.

[0007] The document DE 20 2005 021 981 U1 relates to an equipment kit for inflating inflatable articles, in particular vehicle tires, wherein the equipment kit comprises a compressor assembly, a container of a sealing liquid, a first connecting device for connecting the container to the compressor assembly and to an inflatable article, an outer housing which accommodates the compressor assembly and which defines a seat for the container of the sealing liquid. The container is removably received in the seat. A second connecting device is further provided for stably connecting the container to the compressor assembly such that the container, when received in the seat, remains functionally connected to the compressor assembly. The first connecting device comprises a first hose which connects the container to the compressor assembly and a second hose which is connected to the container.

[0008] The document EP 2 461 036 A1 relates to an air compressor. Task

[0009] The object of the present invention is to simplify and improve such known devices for conveying a gas from a pressure chamber and for transporting a medium. Solution to the task

[0010] The object underlying the invention is achieved by a compressor according to independent patent claim 1, wherein advantageous developments of the compressor according to the invention are specified in claim 2.

[0011] The invention is further achieved by a device according to claim 3, wherein advantageous developments of the device according to the invention are specified in the dependent claims.

[0012] One way to solve the problem is to ensure that the line has a narrowing in front of the tire.

[0013] In a preferred embodiment, this constriction is designed similarly to a Venturi nozzle. This means that a pressure increase or acceleration of the gas flow occurs in the line. This creates an increased suction flow in the intake line for the medium to be conveyed, in particular for the tire sealant, which ensures that the tire sealant is sucked out of the corresponding container and transported further, in particular into a tire, more quickly and completely. Of course, any constriction that leads to an acceleration of the gas flow in the line is within the scope of the invention. The Venturi nozzle-like design is only one embodiment.

[0014] In a preferred embodiment of the invention, the connection to the container for the medium to be transported not only opens into the line, but also the corresponding supply line for the medium extends axially along the gas flow line. This occurs in a nozzle-like manner. This further improves the introduction of the medium into the gas flow.

[0015] A further improvement of the above-mentioned device is that the line and connection are connected to one another in a valve piece which can be connected to the compression chamber in a bayonet-like manner. In the past, this "cylinder head" in particular posed a significant problem, as it consists of many individual parts and has many seals. According to the present invention, however, it should be formed in one piece, with its production from plastic being preferred. It is also designed such that it can be connected to the compression chamber in a bayonet-like manner. This means that it is placed on the compression chamber, briefly turned, and forms a detachable connection with the compression chamber or with the cylinder in which the compression chamber is located.

[0016] For this simple invention, an upper collar is molded onto the compression chamber. This collar has a notch that allows a bayonet-like connection to the valve piece. For this purpose, this collar has a notch with various shapes around its circumference. This shape ensures that the valve piece can be placed on the collar with corresponding projections, which also allow a bayonet-like connection. The projections on the valve piece have hooks that grip the collar when the valve piece is rotated. The rotational movement is then limited by a stop on the collar.

[0017] According to the present invention, only one seal is preferably provided between the valve piece and the compression chamber. In a preferred embodiment, this seal is designed in a disc-like manner and, when the valve piece is placed, is pressed by the valve piece or a corresponding molding onto an outlet opening for compressed gas from the compression chamber. The disc-like seal is flexible, so that compressed gas can push upwards, particularly the edges of the seal, and thus enter the delivery line. If, however, air is drawn in, the seal hermetically seals the opening to the compression chamber.

[0018] In a further embodiment of the invention, the seal is designed like a shuttlecock and has a ball that closes the opening to the compression chamber. Under the pressure of the compressed gas from the compression chamber, the shuttlecock is lifted, flexibly supporting itself against corresponding webs.

[0019] The present invention also relates primarily to the compressor and the improvement of its operation. The compressor has a motor which is eccentrically connected via an output gear to a piston rod which moves a piston in the compression chamber. According to the invention, a transmission gear is arranged upstream of the output gear. The transmission gear and output gear are coordinated with one another in such a way that different power transmission can occur depending on which teeth are in engagement. For this purpose, the output gear is composed of two gear halves which lie one on top of the other. Each gear half has a toothing which, however, does not extend over the entire circumference, but only over a predetermined radian measure. In the preferred embodiment, this radian measure is 180° in each case.

[0020] The transmission gear, on the other hand, consists of two superimposed gears that alternately interact with one or the other half of the output gear. One gear has a larger diameter than the other. The gear with the smaller diameter can exert a greater force on the output gear than the gear with the larger diameter. Therefore, the gear with the smaller diameter engages with the corresponding teeth of the output gear when air is to be compressed into the compression chamber. If, however, only air is to be drawn in, the gear with the larger diameter engages with the teeth of its corresponding output gear half. Character description

[0021] Further advantages, features and details of the invention will become apparent from the following description of preferred embodiments and from the drawing, which shows in Fig. 1 is a perspective view of a compressor according to the invention; Fig. 2 a top view of the compressor according to Fig. 1; Fig. 3 a partially shown view of the compressor according to Fig. 2 seen in direction X; Fig. 4 a perspective view of the interaction of a transmission gear with a driven gear; Fig. 5 an exploded view of an inventive arrangement of compression chamber and valve piece; Fig. 6 a perspective view of the compression chamber according to Fig. 5 with attached valve piece; Fig. 7 a partially illustrated longitudinal section through the arrangement of an embodiment of compression chamber with attached valve piece similar Fig. 6; Fig. 8 a perspective view of the longitudinal section according to Fig. 7 in a further embodiment; Fig. 9 to 12 Longitudinal sections of a further embodiment of a compression chamber with attached valve piece and connecting rod-like driven piston rod in different positions of use.

[0022] According to Fig. 1, a compressor P according to the invention comprises a motor 1 cooled by a fan 2. A transmission gear 3, which interacts with an output gear 4, is mounted on a motor shaft (not shown in detail).

[0023] The output gear 4 is eccentrically connected to a piston rod 5, which drives a piston 6 ( Fig. 3) is moved in a compression chamber 7. A valve piece 8 is mounted on this compression chamber 7, which has a line 9 to, for example, a tire and a connection 10 to, for example, a container for tire sealant.

[0024] The operation of this compressor is as follows: The transmission gear 3 is set in rotation by the motor 1 and transmits its rotation to the output gear 4. This in turn moves the piston rod 5 in the compression chamber 7, as is particularly the case in the Fig. 9 to 12. This forces air from the compression chamber 7 into the valve piece 8 and into the line 9. A medium, in particular tire sealant, is then either drawn in via the connection 10 from a container not shown in detail or additionally forced into the line 9 and thus introduced, for example, into a tire to be sealed.

[0025] Part of the present invention relates to an improvement in the transmission of the power of the engine 1 to the piston rod 5 or the piston 6. It is known that more power is required when compressing the air in the compression chamber 7 than when drawing new air into the compression chamber. To accommodate this force ratio, both the transmission gear 3 and the output gear 4 are preferably designed in two parts. The transmission gear 3 consists of two gears 11 and 12, which lie one on top of the other and have a congruent opening 13 for receiving a motor shaft. Furthermore, the gear 11 also has a larger diameter than the gear 12.

[0026] The output gear 4 consists of two halves 4.1 and 4.2. Each half is provided with a toothing 14.1 or 14.2. Each toothing 14.1 and 14.2 extends over only a semicircle of the respective output gear half 4.1 or 4.2, while the remaining half is free of teeth. Here, too, the output gear half 4.2 with the toothing 14.2 has a larger diameter than the output gear half 4.1 with the toothing 14.1. The gear 12 with the smaller diameter interacts with the output gear half 4.2 with the larger diameter, while the gear 11 with the larger diameter interacts with the output gear half 4.1 with the smaller diameter. As soon as the gear 12 with the smaller diameter engages with the toothing 14.2 of the output gear half 4.2, a higher force can be applied due to the transmission ratio, so that this engagement state is preferred when a higher force is required to act on the piston 6 during compression. When the piston 6 returns to draw new air into the compression chamber 7, the gear 11 with the larger diameter is then in engagement with the toothing 14.1 of the output gear 4.1 with the smaller diameter.

[0027] Another inventive idea relates to the arrangement of the valve piece and the compression chamber. Fig. 5 and Fig. 6 shows a valve piece 8.1, which is bayonet-mounted onto a compression chamber 7.1. For this purpose, the compression chamber 7.1 has a collar 15 provided with a notch. This notch surrounds a connecting opening 16 between the valve piece 8.1 and the compression chamber 7.1. A deep recess 17 is followed by a projection 18, to which a stop 19 is connected.

[0028] The valve piece 8.1 in turn has at least one wing 20, from which a hook-shaped projection 21 projects downwards. For assembly, the valve piece 8.1 is placed on the collar 15, with the projection 21 moving over the deep recess 17. Now, the valve piece 8.1 is rotated relative to the annular collar 15, so that the hook-shaped projection 21 transfers the projection 18 and engages underneath with a hook 22. The rotation can then take place up to the stop 19. This then Fig. The assembly position shown in Figure 6 is reached.

[0029] In one embodiment of the invention, which is also particularly Fig. As shown in Figure 7, a seal, which in this embodiment is designed like a disc, is arranged between the compression chamber 7.1 and the valve piece 8.1 in the region of the connecting opening 16. Corresponding air openings 24 are then configured as elongated holes. When compressed air is discharged from the compression chamber 7.1, the edges of the disc-like seal 23 are raised.

[0030] In another embodiment of the seal between compression chamber 7.2 and valve piece 8.2 according to the Fig. 9 to 12, the seal is designed like a shuttlecock. This shuttlecock seal 25 moves from an open position to a closed position in a chamber 26 of the valve piece 8.2, depending on whether air is to be introduced from the compression chamber 7.2 or drawn into the compression chamber 7.2.

[0031] The inventive idea, which is presented in the Fig. 7 and Fig. 8. There, the line 9 is provided with a Venturi-like constriction 27 after the connection 10 to the tire sealant container. This Venturi-like constriction 27 serves the purpose of accelerating the air flow, thereby increasing the negative pressure in the line 9, so that more tire sealant is sucked out of the container. To further improve this, the connection 10 is provided to extend axially along the line 9 in a somewhat proboscis-like manner. List of reference symbols 1 engine 2 fans 3 gear wheel 4 Output gear 5 Piston rod 6 pistons 7 Compression chamber 8 valve piece 9 Management 10 Connection 11 gear 12 gears 13 Opening 14 teeth 15 collars 16 Connection opening 17 deep indentation 18 lead 19 stop 20 wings 21 Forming 22 hooks 23 Seal 24 Air opening 25 shuttlecock seal 26 Chamber 27 Constriction P Compressor

Claims

[1] Compressor (P) for dispensing a medium, in particular tire sealant, which is to be dispensed from a container into a tire, wherein a motor (1) of the compressor (P) is eccentrically connected via a driven wheel (4) to a piston rod (5) which moves a piston (6) in a compression chamber (7), characterized by in that a transmission gear (3) is arranged upstream of the output gear (4), the output gear (4) consisting of two gear halves (4.1, 4.2), each with a toothing (14.1, 14.2), the toothing (14.1) of one gear half (4.1) extending over one radian measure and the toothing (14.2) of the other gear half (4.2) extending over another radian measure, the transmission gear (3) consisting of two superimposed gears (11, 12) which interact alternately with one or the other gear half (4.1, 4.2) of the output gear (4), and one gear (11) having a larger diameter than the other gear (12). [2] Compressor (P) according to claim 1, wherein the radian measure is predetermined and preferably amounts to 180° in each case. [3] Device for dispensing a medium, in particular tire sealant, which is to be dispensed from a container into a tire by means of a compressor (P), wherein the compressor (P) is a compressor (P) according to claim 1 or 2, wherein the compressor (P) is connectable to the tire via a line (9) and a connection (10) to the container opens into this line (9), and wherein the line (9) has a constriction (27) upstream of the tire. [4] Device according to claim 3, wherein the constriction (27) is formed like a venturi. [5] Device according to claim 3 or 4, the connection (10) to the container opens into the line (9) before the constriction (27) and extends there axially in the direction of the constriction (27) in a trunk-like manner. [6] Device according to one of claims 3 to 5, wherein a compression chamber (7) of the compressor (P) can be connected to the tire via a line (9) and a connection (10) to the container opens into this line (9), wherein the line (9) and the connection (10) are connected to one another in a valve piece (8) which can be connected to the compression chamber (7) in a bayonet-like manner. [7] Device according to claim 6, wherein an upper collar (15) is formed on the compression chamber (7), which has a grid and which is engaged under by hook-like formations (21) of the valve piece (8). [8] Device according to claim 6 or 7, wherein a connecting opening (24) between the valve piece (8) and the compression chamber (27) is occupied by a seal (23, 25). [9] Device according to claim 8, wherein the seal is a flexible, disc-like disc (23). [10] Device according to claim 8, wherein the seal (25) is designed like a shuttlecock.

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