One-way valve and hydraulic system

Abstract

The utility model belongs to the technical field of hydraulic systems, and discloses a one-way valve and a hydraulic system. The one-way valve comprises a valve sleeve and a valve element, the valve sleeve is provided with a cavity and an oil inlet channel which are communicated, the valve element is arranged in the cavity in a sliding mode and can block the oil inlet channel, the valve element is provided with a first boss, the first boss and the inner wall of the cavity are arranged in a spaced mode to form a first filtering channel, and the first filtering channel is used for oil liquid to pass through; and at least part of impurities in the oil can be prevented from crossing the first boss. The one-way valve is simple in structure, impurities in oil can be filtered out, the situation that the impurities enter a controller after passing through the one-way valve, and consequently a valve element of the controller is blocked can be avoided, it is guaranteed that the variable displacement of the hydraulic motor can be normally adjusted, and the normal function of the hydraulic motor is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic systems, in particular to a check valve and a hydraulic system. Background Art

[0002] A hydraulic motor, also known as an oil motor, is an actuator of a hydraulic system. It converts the hydraulic pressure energy provided by a hydraulic pump into the mechanical energy (torque and speed) of its output shaft. The liquid is the medium for transmitting force and motion. The hydraulic motor is controlled by a controller. The hydraulic oil enters the controller after passing through a check valve assembly. The spool of the controller is adjusted by the hydraulic oil, and then the variable displacement of the hydraulic motor is adjusted. If there are many impurities in the hydraulic oil entering the controller, it will cause the spool of the controller to jam, thus affecting the variable displacement adjustment of the hydraulic motor and the use of the hydraulic motor.

[0003] Therefore, a check valve and a hydraulic system are needed to solve the above problems. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a check valve and a hydraulic system, which can filter impurities in the oil, prevent the impurities from entering the controller through the check valve and causing the spool to jam, and thus ensure the normal adjustment of the variable displacement of the hydraulic motor.

[0005] To achieve the above object, the utility model adopts the following technical solutions:

[0006] A check valve, the check valve includes a valve sleeve and a spool. The valve sleeve is provided with a cavity and an oil inlet passage. The cavity is communicated with the oil inlet passage. The spool is slidably arranged in the cavity and can block the oil inlet passage. The spool is provided with a first boss. The first boss and the inner wall of the cavity are spaced apart to form a first filtering channel. The first filtering channel is used for passing the oil, and the first filtering channel can prevent some impurities in the oil from passing over the first boss.

[0007] As an optional technical solution, the spool is further provided with a second boss. The second boss is arranged upstream of the first boss along the conveying direction of the oil. The first boss and the second boss are spaced apart to form a first groove. The first groove and the inner wall of the cavity form a receiving space. The receiving space is used for receiving some impurities in the oil.

[0008] As an optional technical solution, the valve sleeve is provided with a first step. The second boss is provided with a passing surface. The passing surface is parallel to the axis of the spool. The passing surface and the first step are spaced apart to form a second filtering channel. The second filtering channel is used for passing the oil, and the second filtering channel can prevent some impurities in the oil from entering the receiving space.

[0009] As an alternative technical solution, there are at least two passing surfaces provided on the passing surface of the second boss, and the at least two passing surfaces are evenly distributed around the axis of the valve core.

[0010] As an alternative technical solution, a first end surface is provided at the bottom of the first groove, and the multiple first end surfaces are evenly distributed around the axis of the valve core, and some of the first end surfaces are coplanar with some of the passing surfaces.

[0011] As an alternative technical solution, the valve core is further provided with a third boss, the third boss and the second boss form a second groove, an oil passing space is formed between the second groove and the inner wall of the cavity, an oil outlet hole is opened at one end of the valve core away from the oil inlet passage, the oil outlet hole is arranged along the axial direction of the valve core, and the valve core is further provided with an oil passing channel for communicating the oil passing space and the oil outlet hole.

[0012] As an alternative technical solution, a second end surface is provided at the bottom of the second groove, the second end surface is parallel to the axis of the valve core, and the multiple second end surfaces are evenly distributed around the axis of the valve core, and at least part of the second end surfaces are vertically provided with the oil passing channel.

[0013] As an alternative technical solution, a conical surface is provided at one end of the valve core away from the oil outlet hole, and the conical surface is used to block the oil inlet passage.

[0014] As an alternative technical solution, an internal thread is provided on the inner ring of the oil inlet passage, and the internal thread is used to connect a disassembly tool.

[0015] The present utility model also adopts the following technical solution:

[0016] A hydraulic system, the hydraulic system is provided with an oil passage, and the hydraulic system further includes the one-way valve as described above, and the one-way valve is arranged in the oil passage.

[0017] The beneficial effects of the present utility model:

[0018] The present utility model discloses a one-way valve, which is arranged in an oil passage. The one-way valve includes a valve sleeve and a valve core. The valve sleeve is provided with a cavity and an oil inlet passage, and the cavity is communicated with the oil inlet passage. The valve core is slidably arranged in the cavity and can block the oil inlet passage. The valve core is provided with a first boss, and the first boss and the inner wall of the cavity are arranged at intervals to form a first filtering passage. The first filtering passage is used to pass oil and can prevent at least part of the impurities in the oil from passing over the first boss. This one-way valve has a simple structure, can filter the impurities in the oil, can avoid the impurities entering the controller after passing through the one-way valve and causing the valve core of the controller to be stuck, and further ensure that the variable displacement of the hydraulic motor can be adjusted normally and ensure the normal function of the hydraulic motor.

[0019] The present utility model also discloses a hydraulic system, which includes a controller housing and the above-mentioned one-way valve. The controller housing is provided with an oil passage, and the one-way valve is arranged in the oil passage. This hydraulic system avoids the component jamming caused by the impurities in the oil and ensures the normal operation of the hydraulic system. Description of the Drawings

[0020] Figure 1 is a cross-sectional view of the one-way valve according to an embodiment of the present utility model;

[0021] Figure 2 is a cross-sectional view of the one-way valve from another perspective according to an embodiment of the present utility model;

[0022] Figure 3 is a three-dimensional view of the valve core according to an embodiment of the present utility model;

[0023] Figure 4 is an installation schematic diagram of the one-way valve according to an embodiment of the present utility model;

[0024] Figure 5 is another perspective installation schematic diagram of the one-way valve according to an embodiment of the present utility model.

[0025] In the figure:

[0026] 1, rear end cover; 101, oil passage; 2, controller housing; 201, liquid outlet passage; 202, sealing groove;

[0027] 10, one-way valve; 11, valve sleeve; 111, cavity; 112, oil inlet passage; 1121, internal thread; 113, first step; 12, valve core; 121, first boss; 1211, first filtering passage; 122, second boss; 1221, passing surface; 1222, second filtering passage; 123, accommodating space; 1232, first end face; 124, third boss; 125, oil passing space; 1251, second end face; 126, oil outlet hole; 127, oil passing passage; 128, conical surface; 129, oil passing gap. Detailed Embodiments

[0028] The present utility model will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0029] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected to", and "fixed" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0030] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features therebetween. Moreover, the first feature being "above", "over", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or merely indicates that the first feature is at a higher horizontal height than the second feature. The first feature being "below", "under", and "beneath" the second feature includes that the first feature is directly below and obliquely below the second feature, or merely indicates that the first feature is at a lower horizontal height than the second feature.

[0031] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "right", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0032] Such as Figures 1 to 3As shown in the figure, in this embodiment, a one-way valve 10 is provided. The one-way valve 10 includes a valve sleeve 11 and a valve core 12. The valve sleeve 11 is provided with a cavity 111 and an oil inlet passage 112. The cavity 111 and the oil inlet passage 112 are communicated. The valve core 12 is slidably arranged in the cavity 111 and can block the oil inlet passage 112. The valve core 12 is provided with a first boss 121. The first boss 121 and the inner wall of the cavity 111 are spaced apart to form a first filtering channel 1211. The first filtering channel 1211 is used to pass oil, and the first filtering channel 1211 prevents at least part of the impurities in the oil from passing over the first boss 121. Specifically, in this embodiment, the first boss 121 and the inner wall of the cavity 111 form the first filtering channel 1211. When the one-way valve 10 is in the open state, the first filtering channel 1211 and the oil inlet passage 112 are communicated. The oil inlet passage 112 is used to input oil, and the width of the first filtering channel 1211 is the distance between the outer periphery of the first boss 121 and the inner wall of the cavity 111. When the oil passes through the first filtering channel 1211, the impurities in the oil with a cross-sectional width greater than the width of the first filtering channel 1211 cannot pass through the first filtering channel 1211 and be conveyed downward, which can avoid the situation that the downstream components cannot work properly due to these impurities and ensure the normal operation of the components.

[0033] Furthermore, the valve core 12 is further provided with a second boss 122. The second boss 122 is arranged upstream of the first boss 121 along the oil conveying direction. The first boss 121 and the second boss 122 are spaced apart to form a first groove. The first groove and the inner wall of the cavity 111 form a receiving space 123. The receiving space 123 is used to receive part of the impurities in the oil. Specifically, in this embodiment, the first boss 121 and the second boss 122 are spaced apart to form a first groove. The first groove and the inner wall of the cavity 111 form a receiving space 123. When the one-way valve 10 is in the open state, the first filtering channel 1211 can communicate the receiving space 123 and the oil inlet passage 123. The first filtering channel 1211 is used to pass oil. When the oil is conveyed, it first passes through the receiving space 123. When passing through the first filtering channel 1211, the impurities in the oil with a cross-sectional width greater than the width of the first filtering channel 1211 cannot pass through the first filtering channel 1211 and will be stored in the receiving space 123, which can avoid part of the impurities in the oil from being output from the one-way valve 10 and effectively ensure the normal operation of the components. In this embodiment, part of the impurities in the oil are filtered through the first filtering channel 1211, with a simple structure, good effect and low cost. The receiving space 123 can store part of the impurities in the oil, which is convenient for disassembly, installation and cleaning.

[0034] Furthermore, as Figure 3As shown, the valve sleeve 11 is provided with a first step 113, and the second boss 122 is provided with a passing surface 1221. The passing surface 1221 is parallel to the axis of the valve core 12. The passing surface 1221 and the first step 113 are spaced apart to form a second filtering channel 1222. The second filtering channel 1222 is used for passing hydraulic oil, and the second filtering channel 1222 can prevent some impurities in the hydraulic oil from entering the accommodating space 123. Specifically, in this embodiment, the passing surface 1221 and the first step 113 are spaced apart to form the second filtering channel 1222. The width of the second filtering channel 1222 is the distance between the edge of the passing surface 1221 close to the first step 113 and the edge of the first step 113 close to the passing surface 1221. The width of the second filtering channel 1222 is greater than the width of the first filtering channel 1211, and along the conveying direction of the hydraulic oil, the second filtering channel 1222 is located upstream of the first filtering channel 1211. Before the first filtering channel 1211 filters the hydraulic oil, the second filtering channel 1222 first filters the hydraulic oil. Impurities with a larger cross-sectional area in the hydraulic oil cannot pass through the second filtering channel 1222, and then the first filtering channel 1211 filters the impurities with a smaller cross-sectional area in the hydraulic oil. The double filtering can effectively reduce the impurity content in the hydraulic oil, thereby ensuring the cleanliness of the hydraulic oil.

[0035] In this embodiment, the second boss 122 also has a certain guiding function, which can ensure that during the use of the one-way valve 10, the valve core 12 and the valve sleeve 11 have good coaxiality, ensure the normal sliding of the valve core 12 along the valve sleeve 11, and ensure the normal opening and closing of the one-way valve 10.

[0036] Further, there are at least two passing surfaces 1221 provided on the passing surface 1221 of the second boss 122, and the at least two passing surfaces 1221 are evenly distributed around the axis of the valve core 12. Specifically, in this embodiment, there are two passing surfaces 1221 provided on the first step 113 surface, and the two passing surfaces 1221 are oppositely arranged. The two passing surfaces 1221 and the inner wall of the cavity 111 form two second filtering channels 1222, which can ensure the conveying efficiency of the hydraulic oil.

[0037] Further, please refer to Figure 3 , a first end surface 1232 is provided at the bottom of the first groove, and the plurality of first end surfaces 1232 are evenly distributed around the axis of the valve core 12, and some of the first end surfaces 1232 are coplanar with some of the passing surfaces 1221. Specifically, in this embodiment, four first end surfaces 1232 are provided at the bottom of the first groove, which can increase the storage capacity of the accommodating space, store as many impurities as possible, reduce the maintenance frequency, and the two first end surfaces 1232 and two of the oppositely arranged first end surfaces 1232 in this embodiment being coplanar can improve the smoothness of the hydraulic oil conveying and ensure the conveying efficiency of the hydraulic oil.

[0038] Further, the valve core 12 is further provided with a third boss 124. The third boss 124 and the second boss 122 form a second groove. The second groove and the inner wall of the cavity 111 form an oil passage space 125. An oil outlet hole 126 is formed at one end of the valve core 12 away from the oil inlet passage 112. The oil outlet hole 126 is arranged along the axial direction of the valve core 12. The valve core 12 is further provided with an oil passage 127 for communicating the oil passage space 125 and the oil outlet hole 126. Specifically, in this embodiment, the second groove formed between the third boss 124 and the second boss 122 and the inner wall of the cavity 111 form the oil passage space 125. The oil fluid filtered by the first filter passage 1211 enters the oil passage space 125. The oil outlet hole 126 is arranged along the axial direction of the valve core 12. The oil passage 127 of the valve core 12 communicates the oil passage space 125 and the oil outlet hole 126, so that the oil fluid on both sides can be transported through the oil outlet hole 126 located on the axis, improving the transportation efficiency of the oil fluid and facilitating the output of the oil fluid.

[0039] Further, a second end face 1251 is provided at the bottom of the second groove. The second end face 1251 is parallel to the axis of the valve core 12, and a plurality of second end faces 1251 are evenly distributed around the axis of the valve core 12. At least part of the second end faces 1251 are vertically provided with oil passages 127. Specifically, in this embodiment, four second end faces 1251 are provided. The four second end faces 1251 are evenly distributed around the axis of the valve core 12. Two oil passages 127 are provided. The two oil passages 127 are arranged on two relatively arranged second end faces 1251, and the two oil passages 127 are coaxially arranged. This setting can reduce the processing difficulty of the oil passage 127, improve the processing accuracy of the oil passage 127, and can increase the storage capacity of the oil fluid. The setting of two oil passages 127 can also improve the transportation efficiency of the oil fluid. The two oil passages 127 are relatively arranged to ensure that the liquid level of the oil fluid in the oil passage space 125 is relatively uniform, improving the transportation stability of the oil fluid.

[0040] Further, a conical surface 128 is provided at one end of the valve core 12 away from the oil outlet hole 126. The conical surface 128 is used to block the oil inlet passage 112. Specifically, in this embodiment, there is an oil passage gap 129 between one side of the valve core 12 away from the oil outlet hole 126 and the inner wall of the valve sleeve 11 for passing oil fluid. The second filter passage 1222 communicates the oil passage gap 129 and the accommodation space 123.

[0041] Furthermore, an internal thread 1121 is provided on the inner circle of the oil inlet passage 112, and the internal thread 1121 is used to connect a disassembly tool. Specifically, in this embodiment, since the one-way valve 10 is disposed in the oil passage 101, when installing the one-way valve 10, first, the valve sleeve 11 is installed in the oil passage 101 by using a rubber hammer or the like, and then the valve core 12 is installed. When disassembling the one-way valve 10, first remove the valve core 12, and then thread-connect the disassembly tool to the oil inlet passage 112. By pulling the disassembly tool, the valve sleeve 11 can be removed, improving the disassembly convenience of the one-way valve 10.

[0042] In another embodiment, when disassembling the one-way valve 10, the disassembly tool can be thread-connected to the oil inlet passage 112 from a direction away from the cavity 111, and a thrust is applied to the disassembly tool, so that the one-way valve 10 can be pushed out of the oil passage 101 without first disassembling the valve core 12, completing the disassembly work.

[0043] As Figure 4 and Figure 5 shown, this embodiment also discloses a hydraulic system, which includes the above-mentioned one-way valve 10. Specifically, in this embodiment, the hydraulic system includes a rear end cover 1 and a controller housing 2. The rear end cover 1 is provided with an oil passage 101, and the controller housing 2 is provided with a liquid outlet passage 201. The diameter of the oil passage 101 is larger than the diameter of the controller housing 2. The one-way valve 10 is disposed in the oil passage 101, and the rear end cover 1 and the controller housing 2 are detachably connected. Specifically, in this embodiment, the one-way valve 10 is disposed in the oil passage 101 of the rear end cover 1, and then the rear end cover 1 and the controller housing 2 are connected. Moreover, a sealing groove 202 is further provided on the controller housing 2 for sealing the rear end cover 1 and the controller housing 2. The oil in the oil passage 101 passes through the one-way valve 10 and then is output from the liquid outlet passage 201 of the controller housing 2. This hydraulic system avoids damage to components caused by impurities in the oil, has a long service life, and is convenient for disassembly and assembly.

[0044] When the hydraulic system is working, the oil passage 101 of the rear end cover 1 inputs oil into the one-way valve 10. When the oil pressure in the oil passage 101 is higher than the oil pressure in the liquid outlet passage 201 of the controller housing 2, the valve core 12 moves along the valve sleeve 11 to open the oil inlet passage 112. The oil enters the oil passing gap 129 through the oil inlet passage 112. The oil in the oil passing gap 129 enters the accommodation space 123 after passing through the second filter passage 1222, and impurities with a larger cross-sectional area are left in the oil passing gap 129. The oil entering the accommodation space 123 enters the oil passing space 125 after passing through the first filter passage 1211. Impurities with a slightly smaller cross-sectional area cannot pass through the first filter passage 1211 and are stored in the accommodation space 123. The oil after secondary filtration passes through the oil passing passage 127 and is output through the oil outlet hole 126. When the input of oil into the oil passage 101 of the rear end cover 1 stops, the oil pressure in the oil passage 101 drops. When the oil pressure in the oil passage 101 is less than the oil pressure in the liquid outlet passage 201 of the controller, the valve core 12 moves along the valve sleeve 11 until the oil inlet passage 112 is blocked.

[0045] The one-way valve 10 in this embodiment can be applied to the oil inlet end of any hydraulic system that requires impurity removal, which will not be elaborated here.

[0046] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, rather than limitations on the implementation manners of the present invention. For those of ordinary skill in the art, various obvious changes, re-adjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to enumerate all the implementation manners here. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. One-way valve, characterized in that: The one-way valve (10) comprises a valve sleeve (11) and a valve core (12); the valve sleeve (11) is provided with a cavity (111) and an oil inlet passage (112); the cavity (111) and the oil inlet passage (112) are communicated; the valve core (12) is slidably arranged in the cavity (111) and is capable of blocking the oil inlet passage (112); the valve core (12) is provided with a first boss (121); the first boss (121) and the inner wall of the cavity (111) are spaced apart to form a first filter channel (1211); the first filter channel (1211) is used for passing oil, and the first filter channel (1211) is capable of preventing at least part of impurities in the oil from passing over the first boss (121).

2. The one-way valve according to claim 1, characterized in that: The valve core (12) is further provided with a second boss (122), and the second boss (122) is arranged upstream of the first boss (121) along the conveying direction of the oil, and the first boss (121) and the second boss (122) are arranged to form a first groove at an interval, and the first groove and the inner wall of the cavity (111) form a receiving space (123), and the receiving space (123) is used to receive some impurities in the oil.

3. The one-way valve according to claim 2, characterized in that: The valve sleeve (11) is provided with a first step (113), and the second boss (122) is provided with a passing surface (1221), the passing surface (1221) is parallel to the axis of the valve core (12), and the passing surface (1221) and the first step (113) are arranged to form a second filter channel (1222), and the second filter channel (1222) is used for passing the oil, and the second filter channel (1222) can prevent some impurities in the oil from entering the accommodating space (123).

4. The one-way valve according to claim 3, characterized in that: At least two passing surfaces (1221) of the second boss (122) are provided, and the at least two passing surfaces (1221) are evenly distributed around the axis of the valve core (12).

5. The one-way valve according to claim 4, characterized in that: A first end surface (1232) is provided at the bottom of the first groove, and a plurality of the first end surfaces (1232) are evenly distributed around the axis of the valve core (12), and part of the first end surfaces (1232) are coplanar with part of the passing surface (1221).

6. The one-way valve according to claim 1, characterized in that: The valve core (12) is also provided with a third boss (124), the third boss (124) and the first boss (121) form a second groove, the second groove and the inner wall of the cavity (111) form an oil flow space (125), and an oil outlet hole (126) is provided at one end of the valve core (12) away from the oil inlet passage (112), and the oil outlet hole (126) is arranged along the axial direction of the valve core (12). The valve core (12) is also provided with an oil flow passage (127), and the oil flow passage (127) is used to connect the oil flow space (125) and the oil outlet hole (126).

7. The one-way valve according to claim 6, characterized in that: A second end surface (1251) is provided at the bottom of the second groove, the second end surface (1251) is parallel to the axis of the valve core (12), and a plurality of second end surfaces (1251) are evenly distributed around the axis of the valve core (12), and at least part of the second end surfaces (1251) is vertically provided with the oil passage (127).

8. The one-way valve according to claim 6, characterized in that: A conical surface (128) is provided at one end of the valve core (12) away from the oil outlet hole (126), and the conical surface (128) is used to block the oil inlet passage (112).

9. The one-way valve according to any one of claims 1 to 8, characterized in that: The inner ring of the oil inlet passage (112) is provided with an internal thread (1121), and the internal thread (1121) is used for connecting a disassembly tool.

10. Hydraulic system, characterized in that, The hydraulic system comprises a one-way valve (10) as claimed in any one of claims 1 to 9.

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