non-return valve

Abstract

A check valve, particularly for a hydrodynamic machine, for releasing a fluid flow is proposed, comprising a valve body arranged between a component with a sealing surface and a through-channel and a support part in a discharge chamber, wherein a spring element is arranged between the valve body and the support part. According to the invention, it is proposed that the support part is a housing part of the hydrodynamic machine and the valve body comprises a sealing plate and a guide pin, wherein the guide pin is guided in a guide chamber in the housing part and the guide chamber is fluidly connected to the discharge chamber via a channel.

Description

[0001] The invention relates to a check valve, which is particularly suitable for a hydrodynamic machine, for releasing a fluid flow.

[0002] Hydrodynamic machines, such as oil retarders, require at least one check valve for safe operation. This check valve serves to separate the working chamber from the oil tank when idling. Depending on the design, oil retarders have a check valve at both the inlet and outlet of the circuit. During braking operation, a large volume of oil passes through these valves, so these check valves must have a large flow channel to minimize flow resistance. Due to the required flow size, the sealing plate of the check valve must also be correspondingly large. This affects the mounting, which, according to the standard, is achieved via a correspondingly large through-hole in the housing of retarders. This through-hole is closed with a screw, which also provides a guide for the check valve.

[0003] From CN2151725520 U, a valve body for a check valve is known that is suitable for use in a hydrodynamic machine. This has been optimized to have noise-reducing properties.

[0004] The object of the invention is to propose an improved design for a check valve.

[0005] The problem is solved according to the invention by an embodiment according to the independent claim. Further advantageous embodiments of the present invention are found in the dependent claims.

[0006] A check valve, particularly for a hydrodynamic machine, for releasing a fluid flow is proposed, comprising a valve body arranged between a component with a sealing surface and a through-channel and a support part in a discharge chamber, wherein a spring element is arranged between the valve body and the support part.

[0007] According to the invention, it is proposed that the support part is a housing part of the hydrodynamic machine and that the valve body comprises a sealing plate and a guide pin, wherein the guide pin is guided in a guide chamber in the housing part and the guide chamber is fluidly connected to the discharge chamber via a channel. This design allows for simplified assembly of the valve body, eliminating the need for the screw-sealed opening in the housing part according to the standard design, thus removing the risk of oil leakage into the environment at this point.

[0008] In one embodiment, it is proposed that the channel is the gap between the guide pin and the guide chamber. Alternatively, the gap between the guide pin and the guide chamber can be an annular space with a cross-section between 1 mm² and 1 mm². 2 and 20mm 2 exhibits.

[0009] Furthermore, a channel connection between the discharge chamber and the guide chamber can be provided. This allows the damping by the oil in the guide chamber to be adjusted to the desired characteristic for the function of the valve body.

[0010] In one version, the guide pin can be guided in a sleeve that is inserted or screwed into the support part.

[0011] Furthermore, the valve body can include a circumferential sealing bead on the sealing plate, whereby the sealing bead is movable against the sealing surfaces by means of the spring element. In this variant, the valve body is manufactured as a single piece.

[0012] Alternatively, a valve body is conceivable in which the sealing bead is assigned to a rubber element that is attached to the sealing plate.

[0013] The invention will now be described in more detail using the following examples. Fig. 1 explained. The Fig. Figure 1 shows the check valve 1 in the closed state.

[0014] The valve body 2 comprises a sealing plate 9 and a guide pin 10 which is guided in a sleeve 14. Alternatively, the sleeve 14 can be omitted if the support part 6, or the housing of the oil retarder, is designed with appropriate machining and strength so that the support part 6 can perform the function of the guide.

[0015] In both embodiments for guiding the guide pin 10, an annular gap remains between the guide pin 10 and, for example, the sleeve 14, which can also be referred to as a channel 12. The annular gap between the guide pin and the guide space preferably has a cross-section of 1 mm. 2 and 20mm 2 .

[0016] Working fluid, in particular oil, enters the guide chamber 11 through channel 12. This oil alters the mobility of the valve body 2. When opening against the force of the spring element 8, an additional opening force is required to expel air and / or oil from the guide chamber 11. Air and / or oil from the guide chamber 11 can escape via channel 12, the annular gap, and / or via an additional channel connection 15.

[0017] The overall cross-section determines the damping of the movement of the valve body 2 when moving into the open position, as well as into the closed position. An adjustable throttle in the channel connection 15 is also conceivable.

[0018] For improved sealing against the sealing surface 4, the sealing plate 9 has a circumferential sealing bead 13, which can be moved against the sealing surfaces 4 by means of the spring element 8. The sealing bead 14 can also be arranged on a rubber element that is attached to or vulcanized onto the sealing plate 9. Reference symbol list 1 check valve 2 valve bodies 3 components 4 Sealing surface 5 through-channel 6 Support part 7 Discharge room 8 spring element 9 Sealing plate 10 guide pins 11 Command room 12-channel 13 Sealing bead 14 Sleeve 15 channel connection 16 Throttle element QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] CN 2151725520 U

[0003]

Claims

[1] Check valve (1), in particular for a hydrodynamic machine, for releasing a fluid flow, comprising a valve body (2) arranged between a component (3) with a sealing surface (4) and a through-channel (5) and a support part (6) in a discharge chamber (7), wherein a spring element (8) is arranged between the valve body (2) and the support part (6), characterized by , that the support part (6) is the housing part of the hydrodynamic machine and the valve body (2) comprises a sealing plate (9) and a guide pin (10), wherein the guide pin (10) is guided in a guide chamber (11) in the support part (6) and the guide chamber (11) is fluid-conductingly connected to the discharge chamber (7) via a channel (12). [2] Check valve according to claim 1, characterized by , that the channel (12) is the gap between the guide pin (10) and the support part (6). [3] Check valve according to claim 2, characterized by, that the channel (12) between guide pin and guide space is an annular space with a cross-section between 1mm 2 and 20mm 2 exhibits. [4] Check valve according to claim 2 or 3, characterized by , that a channel connection (15) is provided between the discharge chamber (7) and the guide chamber (11). [5] Check valve according to claim 4, characterized by , that a throttling element (16) is arranged in the channel connection (15). [6] Check valve according to claim 1, characterized by , that the guide pin (10) is guided in a sleeve (14). [7] Check valve according to claim 1, characterized by , that the sealing plate (9) includes a circumferential sealing bead (13) on the sealing plate (9) which can be moved against the sealing surfaces (4) by means of the spring element (8). [8] Check valve according to claim 1, characterized by , that the sealing bead (14) is associated with a rubber element that is attached to the sealing plate (9).

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