Oil return device of hydraulic tool

Abstract

The utility model relates to a hydraulic tool oil return device which comprises a hydraulic part body and an oil return component, the hydraulic part body is provided with an oil channel and an oil return groove, the oil return component is located in the oil return groove, the oil return component is connected with the oil return groove in a sealed mode, and the oil return component is communicated with the oil channel. The oil return component comprises a valve seat and a valve bonnet, the valve seat is connected with the bottom of the oil return groove, and the valve seat is connected with the end, away from the oil duct, of the oil return groove in a sealed mode; a via hole is formed in the valve seat and is communicated with the oil duct; the valve bonnet is provided with an upper groove and a lower groove. According to the oil return device of the hydraulic tool, a sealing piece does not move along with the valve element in the moving process, and the sealing effect of the oil return device is improved.

Description

Technical Field

[0001] The utility model relates to the field of oil return devices, in particular to an oil return device for hydraulic tools. Background Art

[0002] Commonly used hydraulic tools include manual hydraulic tools and rechargeable hydraulic tools; the safety pressure setting devices of the hydraulic systems of manual hydraulic tools and rechargeable hydraulic tools both include automatic oil return devices.

[0003] At present, the seal of the oil return device of the hydraulic tool can move with the valve core. During the movement of the valve core, the seal will be driven to move partially. Due to uneven force during the movement of the seal, it will tilt and partially deform, resulting in poor sealing effect. This problem is urgently needed. Utility Model Content

[0004] The purpose of the utility model is to provide an oil return device for a hydraulic tool to solve the above problems.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A hydraulic tool oil return device, comprising a hydraulic component body and an oil return component, wherein the hydraulic component body is provided with an oil passage and an oil return groove, wherein the oil return component is located in the oil return groove, wherein the oil return component is sealedly connected to the oil return groove, and wherein the oil return component is communicated with the oil passage; wherein the oil return component comprises a valve seat and a valve cap, wherein the valve seat is connected to the bottom of the oil return groove, and wherein the valve seat is sealedly connected to an end of the oil return groove away from the oil passage;

[0007] The valve seat is provided with a through hole, and the through hole is communicated with the oil passage;

[0008] The valve cap is provided with an upper groove and a lower groove;

[0009] The oil return component also includes a sealing member and a valve core. The sealing member is located in the upper groove, the valve core passes through the valve cap, and the valve core corresponds to the position of the valve seat.

[0010] Furthermore, the side surface of the valve core is sealed and connected to the valve cap via a sealing member, and the valve core and the through hole are in a straight line.

[0011] Furthermore, the sealing member is an elastic member, a hole blocking portion is provided on the valve core, and the valve core is located directly above the through hole.

[0012] Furthermore, the sealing member is specifically an O-ring, the hole blocking portion matches the size of the through hole, the hole blocking portion and the through hole are concentric with the center of the oil return groove; and the through hole is connected to the oil channel.

[0013] Furthermore, the valve seat is fixedly connected to the bottom of the oil return groove, the valve cap includes an upper valve and a lower valve, and the upper valve and the lower valve are separated; the lower groove is located between the upper valve and the lower valve, and the upper groove is located on the upper valve.

[0014] Furthermore, the valve seat is sealingly connected to the groove wall of the oil return groove, the upper valve is movably connected to the lower valve via an elastic element, and both the upper valve and the lower valve are sealingly connected to the side wall of the oil return groove.

[0015] Furthermore, the elastic element is separated from the side wall of the lower groove, one end of the elastic element is in contact with the upper valve, and the other end of the elastic element is in contact with the lower valve.

[0016] Furthermore, the elastic element is specifically a spring, and the elastic element is located outside the valve core.

[0017] Furthermore, the valve core is movably connected to the upper valve, the valve core is fixedly connected to the lower valve, and a connecting portion is provided on the valve core.

[0018] Furthermore, the connecting portion of the valve core is fixedly connected to the lower valve, and the connecting portion is sealingly connected to the lower valve.

[0019] The beneficial effects of the utility model are: providing a hydraulic tool oil return device, through the valve seat, valve cap, elastic element, upper valve and lower valve used in conjunction with each other, a hydraulic tool oil return device is made to replace the traditional oil return device, to achieve the effect of the seal in the upper groove when the oil return device is working, the seal will not follow the movement of the valve core during the movement, thereby improving the sealing effect of the oil return device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The utility model is an axonometric diagram of the overall structure of a hydraulic tool oil return device.

[0021] Figure 2 This is another overall structural axonometric diagram of a hydraulic tool oil return device of the utility model.

[0022] Figure 3 The utility model is a cross-sectional view of the overall structure of a hydraulic tool oil return device.

[0023] Figure 4 This is another overall structural sectional view of a hydraulic tool oil return device of the utility model.

[0024] Figure 5 for Figure 4 A partial enlarged view of part A.

[0025] In the figure: 1. hydraulic component body; 2. oil channel; 3. oil return groove; 4. oil return component; 5. valve seat; 6. through hole; 7. valve cap; 8. sealing component; 9. upper groove; 10. lower groove; 11. upper valve; 12. lower valve; 13. elastic element; 14. valve core; 141. hole blocking part. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the utility model and are not used to limit the utility model. The same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described in the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model.

[0027] In the description of the present utility model, it is necessary to understand that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "axial" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, 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 therefore cannot be understood as a limitation on the present utility model. In addition, features defined as "first" and "second" may explicitly or implicitly include one or more of the features, and in the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0028] refer to Figures 1 to 5 , a hydraulic tool oil return device, comprising a hydraulic component body 1 and an oil return component 4, the hydraulic component body 1 is provided with an oil passage 2 and an oil return groove 3, the oil return component 4 is located in the oil return groove 3, the oil return component 4 is sealed and connected to the oil return groove 3, the oil return component 4 is communicated with the oil passage 2, and is used to receive part of the hydraulic pressure to protect the hydraulic tool from oil return when the pressure of the hydraulic tool is too large; it is characterized in that: the oil return component 4 comprises a valve seat 5 and a valve cap 7, the valve seat 5 is connected to the bottom of the oil return groove 3, the valve seat 5 is sealed and connected to one end of the oil return groove 3 away from the oil passage 2, and is used to isolate the oil return groove 3 from the external space;

[0029] The valve seat 5 is provided with a through hole 6 for serving as a hydraulic passage, and the through hole 6 is connected with the oil passage 2 for serving as a hydraulic passage;

[0030] The valve cap 7 is provided with an upper groove 9 and a lower groove 10 for placing the sealing member 8 and the elastic element 13 respectively;

[0031] The oil return component 4 also includes a seal 8 and a valve core 14. The seal 8 is located in the upper groove 9 to prevent the seal 8 from following the movement of the valve core 14. The valve core 14 passes through the valve cap 7. The position of the valve core 14 corresponds to that of the valve seat 5. The two cooperate with each other to seal and conduct the oil return device and the oil channel 2.

[0032] The side of the valve core 14 is sealed and connected to the valve cap 7 via a seal 8 for sealing between the valve core 14 and the valve cap 7. The valve core 14 and the through hole 6 are in a straight line, and the two cooperate with each other to seal and conduct the oil return device and the oil channel 2.

[0033] The sealing member 8 is an elastic member, and a hole blocking portion 141 is provided on the valve core 14 to ensure that the through hole 6 can be blocked. The valve core 14 is located directly above the through hole 6, and the two cooperate with each other to seal and conduct the oil return device and the oil channel 2.

[0034] The sealing member 8 is specifically an O-ring, and the hole blocking portion 141 matches the size of the through hole 6. The two cooperate with each other to seal and conduct the oil return device and the oil channel 2. The hole blocking portion 141 and the through hole 6 are both concentric with the center of the oil return groove 3; the through hole 6 is connected to the oil channel 2.

[0035] The valve seat 5 is fixedly connected to the bottom of the oil return groove 3, and the valve cap 7 includes an upper valve 11 and a lower valve 12. The upper valve 11 and the lower valve 12 are separated to ensure that they can move relative to each other; the lower groove 10 is located between the upper valve 11 and the lower valve 12 to provide an installation position for the elastic element 13, and the upper groove 9 is located on the upper valve 11 to ensure that the relative position of the seal 8 in the upper groove 9 and the upper valve 11 is stable.

[0036] The valve seat 5 is sealed to the groove wall of the oil return groove 3 , and the upper valve 11 is movably connected to the lower valve 12 via an elastic element 13 to ensure that the lower valve 12 can move. Both the upper valve 11 and the lower valve 12 are sealed to the side wall of the oil return groove 3 .

[0037] The elastic element 13 is separated from the side wall of the lower groove 10, one end of the elastic element 13 contacts the upper valve 11, and the other end of the elastic element 13 contacts the lower valve 12, and is used to drive the lower valve 11 and the valve core 14 to reset after the pressure in the oil channel 2 decreases, so that the hole blocking portion 141 of the valve core 14 blocks the through hole 6.

[0038] The elastic element 13 is specifically a spring, and the elastic element 13 is located outside the valve core 14 to avoid interference between the two.

[0039] The valve core 14 is movably connected to the upper valve 11 , and the valve core 14 is fixedly connected to the lower valve 12 . A connecting portion is provided on the valve core 14 to ensure that the valve core 14 and the lower valve 12 move synchronously.

[0040] The connecting portion of the valve core 14 is fixedly connected to the lower valve 12 , and the connecting portion is sealedly connected to the lower valve 12 to ensure that the valve core 14 and the lower valve 12 move synchronously.

[0041] The working principle of the utility model is as follows: before starting to use a hydraulic tool oil return device, install the hydraulic tool oil return device on the hydraulic part, that is, fix the valve seat 5 of the hydraulic tool oil return device to the bottom of the oil return groove 3, connect the valve cap 7 to the upper part of the oil return groove 3, and adjust the distance between the upper valve 11 and the lower valve 12 at the same time, so as to adjust the tightness of the elastic element 13, so as to adjust the return oil pressure of the oil return device; when starting to use a hydraulic tool oil return device: when the pressure of the hydraulic tool system reaches a certain level, the pressure of the liquid in the oil channel 2 on the valve core 14 increases, and the valve core 14 moves upward under the pressure of the hydraulic pressure through the through hole 6, and the hydraulic pressure is discharged from the oil channel 2 through the through hole 6 on the valve seat 5, and reaches between the valve cap 7 and the valve seat 5; the hydraulic pressure on the valve core The pressure at the bottom of 14 pushes the valve core 14 and the lower valve 12 away from the valve seat 5. The elastic element 13 outside the valve core 14 is partially compressed under the action of the lower valve 12, so that the liquid between the valve cap 7 and the valve seat 5 increases, and the valve core 14 cannot return to the valve seat 5 to seal the through hole 6; only when the hydraulic pressure of the hydraulic tool becomes smaller, the lower valve 12 moves toward the valve seat 5 under the action of the elastic element 13, and at the same time drives the valve core 14 to move toward the valve seat 5, and presses the liquid between the lower valve 12 and the valve seat 5 back into the oil channel 2 through the through hole 6. After the hydraulic pressure is fully returned to the oil channel 2, the valve core 14 is sealed with the through hole 6 of the valve seat 5 by its blocking part 141 under the action of the elastic element 13, and the hydraulic tool can perform the next work. When the pressure in the oil channel 2 of the hydraulic tool reaches a certain level, the above process is repeated.

[0042] The above contents are further detailed descriptions of the present invention in combination with specific preferred implementations, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field of the present invention, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A hydraulic tool oil return device, comprising a hydraulic component body (1) and an oil return component (4), wherein the hydraulic component body (1) is provided with an oil passage (2) and an oil return groove (3), the oil return component (4) is located in the oil return groove (3), the oil return component (4) is sealedly connected to the oil return groove (3), and the oil return component (4) is communicated with the oil passage (2); characterized in that: The oil return component (4) comprises a valve seat (5) and a valve cap (7), the valve seat (5) being connected to the bottom of the oil return groove (3), and the valve seat (5) being sealingly connected to an end of the oil return groove (3) away from the oil passage (2); The valve seat (5) is provided with a through hole (6), and the through hole (6) is connected to the oil passage (2); The valve cap (7) is provided with an upper groove (9) and a lower groove (10); The oil return component (4) further comprises a sealing member (8) and a valve core (14); the sealing member (8) is located in the upper groove (9); the valve core (14) passes through the valve cap (7); and the valve core (14) corresponds to the position of the valve seat (5).

2. The hydraulic tool oil return device according to claim 1, characterized in that: The side surface of the valve core (14) is sealedly connected to the valve cap (7) via a sealing member (8), and the valve core (14) and the through hole (6) are in a straight line.

3. The hydraulic tool oil return device according to claim 2, characterized in that: The sealing member (8) is an elastic member, a hole blocking portion (141) is provided on the valve core (14), and the valve core (14) is located directly above the through hole (6).

4. The hydraulic tool oil return device according to claim 3, characterized in that: The sealing member (8) is specifically an O-ring, the hole blocking portion (141) matches the size of the through hole (6), the hole blocking portion (141) and the through hole (6) are both concentric with the center of the oil return groove (3); and the through hole (6) is connected to the oil passage (2).

5. The hydraulic tool oil return device according to claim 1, characterized in that: The valve seat (5) is fixedly connected to the bottom of the oil return groove (3); the valve cap (7) comprises an upper valve (11) and a lower valve (12); the upper valve (11) and the lower valve (12) are separated; the lower groove (10) is located between the upper valve (11) and the lower valve (12); and the upper groove (9) is located on the upper valve (11).

6. The hydraulic tool oil return device according to claim 5, characterized in that: The valve seat (5) is sealedly connected to the groove wall of the oil return groove (3), the upper valve (11) is movably connected to the lower valve (12) via an elastic element (13), and both the upper valve (11) and the lower valve (12) are sealedly connected to the side wall of the oil return groove (3).

7. The hydraulic tool oil return device according to claim 6, characterized in that: The elastic element (13) is separated from the side wall of the lower groove (10), one end of the elastic element (13) is in contact with the upper valve (11), and the other end of the elastic element (13) is in contact with the lower valve (12).

8. The hydraulic tool oil return device according to claim 7, characterized in that: The elastic element (13) is specifically a spring, and the elastic element (13) is located outside the valve core (14).

9. The hydraulic tool oil return device according to claim 1, characterized in that: The valve core (14) is movably connected to the upper valve (11), the valve core (14) is fixedly connected to the lower valve (12), and a connecting portion is provided on the valve core (14).

10. The hydraulic tool oil return device according to claim 9, characterized in that: The connecting portion of the valve core (14) is fixedly connected to the lower valve (12), and the connecting portion is sealedly connected to the lower valve (12).

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