Hydrodynamic retarder float type non-return valve

Abstract

The application discloses a hydraulic retarder float type one-way valve, which comprises a retarder shell, a float, a bleeder valve body, a metal filter screen, an oil absorption felt and a dustproof plug cover. The float adopts a semi-spherical structure, is installed in a cavity of the retarder shell, and is communicated with a retarder working cavity at the bottom of the retarder shell. A float positioning conical surface is arranged in the cavity of the retarder shell and is used for positioning the bottom of the float. The bleeder valve body is installed on the top of the float and is sealingly connected with the inner wall of the retarder shell. The matching surface between the inner wall of the bleeder valve body and the top of the float is designed as a float positioning inclined surface and is used for limiting the top of the float. The metal filter screen is arranged outside the bleeder valve body and is covered with the oil absorption felt. The dustproof plug cover is fixed at the outermost part and is provided with a vent hole laterally. The float positioning is accurate, the oil-gas separation effect is good, and the installation and maintenance are facilitated.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of hydraulic retarder, and particularly relates to a float type one-way valve of a hydraulic retarder. BACKGROUND

[0002] The hydraulic retarder is an auxiliary braking device, and the working chamber of the hydraulic retarder is composed of a rotor with vanes and a stator also with vanes. The braking is achieved by using a control medium to act on the working medium and press the working medium into the working chamber, and the kinetic energy of the vehicle is converted into the heat energy of the working medium through the high-speed rotation of the rotor.

[0003] During the working of the retarder, the working medium (oil) needs to be pressed into the working chamber, and in order to ensure that the oil is fully filled, the air in the working chamber needs to be discharged. During the process of pressing the oil and discharging the gas in the working chamber, and during the working process of the retarder, part of the oil-gas mixture will be discharged through the exhaust hole. Only when the oil-gas mixture is fully and effectively separated, the use performance of the retarder can be ensured. However, how to completely and effectively separate the oil-gas mixture of the retarder has been a technical difficulty.

[0004] During the working of the hydraulic retarder, the working oil is pressed into the working chamber by using high-pressure gas, and the braking torque is generated through the interaction of the stator and the rotor in the working chamber. At the moment of pressing the oil, a small part of the oil-gas mixture will be discharged from the exhaust hole of the working chamber. The discharged oil-gas mixture needs to be separated, so that the oil flows back into the chamber, and only the gas is discharged to the outside. If effective oil-gas separation cannot be achieved, the oil will be sprayed from the exhaust port of the working chamber, and long-term serious oil spraying will result in a decrease in braking force, which affects the use performance of the retarder.

[0005] Therefore, an oil-gas separation device which is convenient to process and assemble is urgently needed to effectively separate the oil-gas mixture in the exhaust process of the working chamber of the retarder, and to reduce the probability of failure of the retarder.

[0006] At present, in the hydraulic retarder, in order to discharge the air in the working chamber of the stator and the rotor and the gas generated by vaporization, a float structure can be used, but the structure is complex, the diameter of the float is large, the space occupied is large, and the arrangement is not conducive. The float has a special lower shell to form a small subassembly, and the cost is high. The sealing surface of the float adopts a partial spherical shape, although the valve opening can be increased, the stress is not good, and the thickness of the float steel plate needs to be increased, so the volume of the float is large. SUMMARY

[0007] In order to solve the above problems in the prior art, the application provides a float type one-way valve of a hydraulic retarder, which is accurate in positioning, good in oil-gas separation effect, and convenient to install and maintain.

[0008] The application is achieved by the following technical scheme, in combination with the drawings:

[0009] A hydraulic retarder float type one-way valve, comprising a retarder housing 1, a float 2, a bleeder valve body 5, a metal screen 7, an oil absorption felt 9, and a dustproof plug cover 10; the float 2 adopts a semi-spherical structure, is installed in a cavity of the retarder housing 1, and is communicated with a retarder working cavity at the bottom of the retarder housing 1; a float positioning conical surface 11 is arranged in the cavity of the retarder housing 1 and used for positioning the bottom of the float 2; the bleeder valve body 5 is installed on the top of the float 2 and is sealingly connected with the inner wall of the retarder housing 1; a cooperation surface between the inner wall of the bleeder valve body 5 and the top of the float 2 is designed as a float positioning inclined surface 51 and used for limiting the top of the float 2; the metal screen 7 is arranged outside the bleeder valve body 5, and the oil absorption felt 9 is arranged on the metal screen 7; and the dustproof plug cover 10 is fixed at the outermost part and is provided with a vent hole in the lateral direction.

[0010] Further, the float 2 is processed by using a 0.25 mm stainless steel plate.

[0011] Further, the float 2 has a diameter of not less than 26 mm.

[0012] Further, the retarder housing 1 is further provided with float guide ribs 12 in the circumferential direction in the cavity and used for guiding the float 2 to the float positioning conical surface 11 in the falling process of the float 2.

[0013] Further, the bleeder valve body 5 is sealingly connected with the inner wall of the retarder housing 1 through a first O-shaped sealing ring 3 and a second O-shaped sealing ring 6.

[0014] Further, the bleeder valve body 5 is provided with a skeleton oil seal 4.

[0015] Further, the metal screen 7 is fixed with the inner wall of the retarder housing 1 through a clasp ring 8.

[0016] Further, the dustproof plug cover 10 adopts a plastic dustproof plug cover.

[0017] Further, the dustproof plug cover 10 is fixed with the retarder housing 1 through a buckle structure.

[0018] The present application has the following advantages:

[0019] 1. The float sealing surface adopts a semi-spherical structure, and the stress structure has high bearing capacity, so that a thinner steel plate, such as a 0.25 mm stainless steel plate, can be used, and the float diameter can be as small as 26 mm, so that the volume of the float can be reduced, and the arrangement is facilitated.

[0020] 2. The bleeder valve body is designed with a float positioning inclined surface, so as to ensure that the float compression sealing material is in a reasonable compression range, thereby prolonging the service life of the valve and ensuring the positioning of the float.

[0021] 3. The air release valve body is provided with a metal filter screen, which plays a certain oil-gas separation role, and an oil absorption felt is further provided outside the filter screen, which plays a role of dust prevention and oil leakage prevention;

[0022] 4. The float lower housing is cancelled, a conical slope is directly machined in the retarder housing, the float opening and closing stroke is ensured, one component is saved, assembly is simple, and quality is easy to ensure;

[0023] 5. The outermost part is provided with a plastic dustproof plug cover, the plug cover is provided with a lateral air hole, dust is prevented from entering, internal gas is discharged, the plug cover is connected with the retarder housing through an elastic buckle structure, the strength is ensured, and installation and maintenance are facilitated;

[0024] 6. The retarder housing is provided with a float guide rib which is uniformly distributed in the cavity of the housing in the circumferential direction, the gap between the float and the guide rib is reasonable, oil and gas can smoothly pass through, gas is discharged, and enough medium can make the float float up when the medium overflows. BRIEF DESCRIPTION OF DRAWINGS

[0025] Fig. 1 Fig. 1 is an exploded view of the float type one-way valve of the hydraulic retarder according to the present application;

[0026] Fig. 2 Fig. 2 is a schematic view of the float type one-way valve of the hydraulic retarder according to the present application in an open state;

[0027] Fig. 3 Fig. 3 is a schematic view of the float type one-way valve of the hydraulic retarder according to the present application in a closed state;

[0028] In the drawings:

[0029] 1-retarder housing; 11-float positioning conical surface; 12-float guide rib; 2-float; 3-No. 1 O-shaped sealing ring; 4-skeleton oil seal; 5-air release valve body; 51-float positioning slope; 6-No. 2 O-shaped sealing ring; 7-metal filter screen; 8-clasp; 9-oil absorption felt; 10-dustproof plug cover. DETAILED DESCRIPTION

[0030] The technical scheme of the present application will be further described below in combination with the drawings and examples:

[0031] The application discloses a hydraulic retarder float type one-way valve, which comprises a retarder shell 1, a float 2, a bleeder valve body 5, a metal filter screen 7, an oil absorption felt 9 and a dustproof plug cover 10; the float 2 adopts a semi-spherical structure, the float 2 is installed in a cavity of the retarder shell 1, and the bottom of the retarder shell 1 is communicated with a retarder working cavity; the cavity of the retarder shell 1 is provided with a float positioning conical surface 11 for positioning the bottom of the float 2; the bleeder valve body 5 is installed on the top of the float 2 and is sealingly connected with the inner wall of the retarder shell 1; the matching surface between the inner wall of the bleeder valve body 5 and the top of the float 2 is a float positioning inclined surface 51 for limiting the top of the float 2; the metal filter screen 7 is arranged outside the bleeder valve body 5, and the oil absorption felt 9 is covered on the metal filter screen 7; the dustproof plug cover 10 is fixed at the outermost part, and the dustproof plug cover 10 is laterally provided with a vent hole.

[0032] Further, the float 2 is made of 0.25mm stainless steel plate.

[0033] Further, the diameter of the float 2 is not less than 26mm.

[0034] Further, the cavity of the retarder shell 1 is further provided with float guide ribs 12 along the circumferential direction for guiding the float 2 to the float positioning conical surface 11 during the falling process of the float 2.

[0035] Further, the bleeder valve body 5 is sealingly connected with the inner wall of the retarder shell 1 through a first O-shaped sealing ring 3 and a second O-shaped sealing ring 6.

[0036] Further, the bleeder valve body 5 is provided with a skeleton oil seal 4.

[0037] Further, the metal filter screen 7 is fixed with the inner wall of the retarder shell 1 through a clasp 8.

[0038] Further, the dustproof plug cover 10 adopts a plastic dustproof plug cover.

[0039] Further, the dustproof plug cover 10 is fixed with the retarder shell 1 through a buckle structure.

[0040] Embodiment

[0041] As Figs. 1 to 3As shown, a hydraulic retarder float type one-way valve, including retarder housing 1, float 2, O-ring 3, skeleton oil seal 4, air release valve body 5, O-ring 6, metal filter 7, snap ring 8, oil felt 9, dust plug cover 10; float 2 adopts a hemispherical structure, float 2 is installed in the cavity of the retarder housing 1, the bottom of the retarder housing 1 is communicated with the retarder working cavity; the cavity of the retarder housing 1 is provided with a float positioning taper surface 11 for positioning the bottom of the float 2; and the cavity of the retarder housing 1 is also provided with a float guide rib 12 in the circumferential direction for guiding the float 2 to the float positioning taper surface 11 during the pressing process of the float 2; the air release valve body 5 is installed on the top of the float 2 and is sealed and connected with the inner wall of the retarder housing 1 through O-ring 3 and O-ring 6 respectively; the skeleton oil seal 4 is installed in the air release valve body 5 for preventing the working medium (oil) from overflowing from the valve body; the cooperation surface between the inner wall of the air release valve body 5 and the top of the float 2 is provided with a float positioning inclined surface 51 for limiting the top of the float 2; the metal filter 7 is provided outside the air release valve body 5 and is fixed with the inner wall of the retarder housing 1 through the snap ring 8, the oil felt 9 is covered on the metal filter 7 as a secondary filter, which plays a role in dust prevention and oil leakage prevention; the dust plug cover 10 is fixed at the outermost part, the dust plug cover 10 adopts a plastic dust plug cover and is fixed with the retarder housing 1 through a buckle structure, the dust plug cover 10 is laterally provided with a vent hole to avoid dust entering and ensure the discharge of internal gas.

Claims

1. A hydraulic retarder float-type check valve, characterized by, The device comprises a retarder shell (1), a float (2), a bleeder valve body (5), a metal filter screen (7), an oil absorption felt (9), and a dustproof plug cover (10). The float (2) is in a semi-spherical structure and is installed in the cavity of the retarder shell (1). The bottom of the retarder shell (1) is communicated with the working cavity of the retarder. A float positioning conical surface (11) is arranged in the cavity of the retarder shell (1) for positioning the bottom of the float (2). The bleeder valve body (5) is installed on the top of the float (2) and is sealingly connected with the inner wall of the retarder shell (1). The inner wall of the bleeder valve body (5) and the top of the float (2) are provided with a float positioning inclined surface (51) for limiting the top of the float (2). The metal filter screen (7) is arranged outside the bleeder valve body (5) and is covered with the oil absorption felt (9). The dustproof plug cover (10) is fixed on the outermost part, and the dustproof plug cover (10) is provided with a vent hole laterally.

2. A hydraulic retarder float-type check valve according to claim 1, characterized in that The float (2) is made of 0.25mm stainless steel plate.

3. A hydraulic retarder float-type check valve according to claim 1, wherein The diameter of the float (2) is not less than 26mm.

4. A hydraulic retarder float-type check valve according to claim 1, characterized in that, The cavity of the retarder shell (1) is also provided with float guide ribs (12) along the circumferential direction for guiding the float (2) to the float positioning conical surface (11) during the falling process of the float (2).

5. A hydraulic retarder float-type check valve according to claim 1, wherein The bleeder valve body (5) is sealingly connected with the inner wall of the retarder shell (1) through a No. 1 O-shaped sealing ring (3) and a No. 2 O-shaped sealing ring (6).

6. A hydraulic retarder float-type check valve as defined in claim 1, wherein The bleeder valve body (5) is provided with a skeleton oil seal (4).

7. A hydraulic retarder float-type check valve as defined in claim 1, wherein The metal filter screen (7) is fixed with the inner wall of the retarder shell (1) through a snap ring (8).

8. A hydraulic retarder float-type check valve as defined in claim 1, wherein The dustproof plug cover (10) is made of plastic.

9. A hydraulic retarder float-type check valve as defined in claim 1, wherein The dustproof plug cover (10) is fixed with the retarder shell (1) through a buckle structure.

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