Reversing valve and hydraulic breaking hammer
By replacing the pressure stabilizing groove with low-pressure and high-pressure stabilizing channels in the reversing valve, the problem of easy roughening on the valve sleeve surface was solved, extending its service life.
Patent Information
- Application Number
- CN202520727524.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-01-13
- Estimated Expiration
- 2035-04-17
AI Technical Summary
The surface of components near the pressure stabilizing groove of existing reversing valves is prone to scratching, which leads to a shortened service life.
The existing pressure stabilizing groove is replaced with a low-pressure stabilizing channel and a high-pressure stabilizing channel, which reduces the machining area and sharp edges of the valve sleeve outer wall and improves the problem of uneven radial force.
It effectively improved the surface roughness of the valve sleeve and extended the service life of the workpiece.
Smart Images
Figure CN223794399U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of hydraulic device technology, specifically relating to a reversing valve and a hydraulic breaker. Background Technology
[0002] Hydraulic breakers, also known simply as "breakers," are typically installed on the bucket or loading part of excavators and loaders. They are mainly used for breaking, demolishing, and excavating hard layers in construction. They have advantages such as high impact force, ease of use, good mobility, and high efficiency.
[0003] Existing hydraulic breakers generally consist of a cylinder, chisel, piston, and hydraulic system. Both the chisel and piston are slidably mounted within the cylinder. The hydraulic system drives the piston to reciprocate axially along the cylinder, causing it to continuously strike the chisel. The hydraulic system mainly includes an oil pump, hydraulic lines, and a directional valve. The directional valve, as the core component of the hydraulic system, controls the flow of hydraulic oil within it.
[0004] like Figures 1 to 2 As shown, a directional control valve typically consists of a fixed component and a moving component. The fixed component is usually the valve body, and sometimes includes a valve core. The moving component is usually the valve sleeve, and sometimes includes a valve core. The fixed and moving components work together to form a high-pressure chamber, a pressure relief chamber, and a signal chamber. The high-pressure chamber is connected to the high-pressure oil circuit through a high-pressure channel, the pressure relief chamber is connected to the return oil circuit through a return oil channel, and the signal chamber is connected to the cylinder body through a signal channel. The moving component has a first force-bearing surface and a first pressure-equalizing groove in the high-pressure chamber along the sliding direction, and a second force-bearing surface and a second pressure-equalizing groove in the signal chamber. The first force-bearing surface, the second force-bearing surface, the first pressure-equalizing groove, and the second pressure-equalizing groove are all annular. One side of the first pressure-equalizing groove is flush with the first force-bearing surface, and one side of the second pressure-equalizing groove is flush with the second force-bearing surface. The area of the second force-bearing surface is larger than the area of the first force-bearing surface. As the piston changes position within the cylinder body, the signal chamber connects to the high-pressure oil circuit or the return oil circuit, thereby driving the moving component to slide relative to the fixed component, completing the directional control operation.
[0005] Specifically, the movable part moves towards the side of the high-pressure chamber away from the low-pressure chamber until it abuts against the fixed part. This is called the upper position of the movable part. The signal chamber is connected to the return oil circuit and is in a low-pressure state. The pressure on the second force surface is less than the pressure on the first force surface, causing the movable part to move towards the side where the pressure relief chamber is located until it abuts against the fixed part. This is called the lower position of the movable part. The reversing valve completes one reversal, driving the piston in the cylinder to move. After the piston moves to the position, it will connect the signal chamber to the high-pressure oil circuit. The signal chamber is in a high-pressure state and the pressure is equal to that of the high-pressure chamber. Since the area of the second force surface is larger than that of the first force surface, the movable part will move from the lower position to the upper position, completing another reversal and driving the piston in the cylinder to move in the opposite direction. This cycle repeats continuously.
[0006] Because the fit between the fixed and moving parts of a directional control valve is typically a clearance fit, an oil film forms within the clearance for support and lubrication. Therefore, oil leakage can occur between the signal chamber and the pressure relief and high-pressure chambers, causing pressure instability in the signal chamber and premature movement of the moving parts, thus affecting the normal operation of the directional control valve. Therefore, pressure-stabilizing grooves are usually created on the surface of the moving parts. When the moving part is in the lower position, the pressure-stabilizing groove connects the signal chamber and the pressure relief chamber; when the moving part is in the upper position, the pressure-stabilizing groove connects the signal chamber and the high-pressure chamber.
[0007] However, during use, it was found that the surface of the components near the pressure stabilizing groove is prone to roughening. After research and analysis, it may be because the pressure stabilizing groove is opened on the outer side of the moving component, and the processing area on the outer side of the moving component is large. During processing, it causes local deformation of the moving component, which can easily cause uneven radial force and circumferential oil pressure imbalance when the moving component slides. Alternatively, the groove on the surface may create more sharp edges, which can ultimately cause the surface of the component to be prone to roughening, affecting the service life of the workpiece. Utility Model Content
[0008] This utility model provides a reversing valve and a hydraulic breaker, aiming to solve the technical problems mentioned in the background art.
[0009] To achieve the above objectives, the technical solution adopted by this utility model is as follows:
[0010] In a first aspect, this utility model provides a reversing valve, including a valve body, a valve core, and a valve sleeve. The valve core is fixedly disposed in the valve body, and the valve sleeve is slidably disposed between the valve body and the valve core. The valve body, the valve core, and the valve sleeve cooperate to form a high-pressure chamber, a pressure relief chamber, and a signal chamber. The valve core has an oil passage chamber communicating with the high-pressure chamber, and the signal chamber is disposed between the high-pressure chamber and the pressure relief chamber.
[0011] The valve sleeve has a low-pressure stabilizing channel and a high-pressure stabilizing channel. The low-pressure stabilizing channel has two openings, namely a low-pressure opening and a low-pressure signal opening. Both the low-pressure opening and the low-pressure signal opening are located on the outer wall of the valve sleeve, and the low-pressure signal opening is connected to the signal cavity. The high-pressure stabilizing channel penetrates the side wall of the valve sleeve, and one end is connected to the signal cavity.
[0012] The valve core has a high-pressure communication channel that penetrates the valve core, and one end of the high-pressure communication channel is connected to the oil passage.
[0013] When the valve sleeve is in the lower position, the low-pressure port is connected to the pressure relief chamber, the low-pressure signal port is connected to the signal chamber, and the high-pressure communication channel is blocked by the valve sleeve, so that the signal chamber is connected to the pressure relief chamber and isolated from the high-pressure chamber; when the valve sleeve is in the upper position, the high-pressure stabilizing channel is connected to the high-pressure communication channel, and the low-pressure port is separated from the pressure relief chamber, so that the signal chamber is connected to the high-pressure chamber and isolated from the pressure relief chamber.
[0014] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the low-pressure stabilizing channel includes a low-pressure branch hole, a signal branch hole, and a low-pressure stabilizing main hole. The low-pressure branch hole and the signal branch hole are both opened on the outer wall of the valve sleeve, and the low-pressure stabilizing main hole is opened inside the valve sleeve and is connected and communicated with the low-pressure branch hole and the signal branch hole.
[0015] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, there are one or more low-pressure stabilizing channels. When there are multiple low-pressure stabilizing channels, the low-pressure stabilizing channels are uniformly arranged along the circumference of the valve sleeve.
[0016] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, there are four low-pressure stabilizing channels, and the four low-pressure stabilizing channels are evenly arranged along the circumference of the valve sleeve.
[0017] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, there are one or more high-pressure stabilizing channels. When there are multiple high-pressure stabilizing channels, the high-pressure stabilizing channels are uniformly arranged along the circumference of the valve sleeve.
[0018] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, there are two high-pressure stabilizing channels, and the two high-pressure stabilizing channels are evenly arranged along the circumference of the valve sleeve.
[0019] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the valve sleeve is provided with a low-pressure equalizing groove at the low-pressure port, a signal equalizing groove at the low-pressure signal port, and an outer high-pressure equalizing groove and an inner high-pressure equalizing groove at both ends of the high-pressure connecting channel, wherein the outer high-pressure equalizing groove is located between the low-pressure equalizing groove and the signal equalizing groove, and the outer wall of the valve core is provided with a high-pressure connecting equalizing groove at one end of the high-pressure connecting channel.
[0020] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the signal equalization groove and the second equalization groove are arranged to overlap or be spaced apart.
[0021] In conjunction with the first aspect, in one possible implementation of the reversing valve provided by this utility model, the signal equalization groove and the second equalization groove are spaced apart, and the signal equalization groove is opened on the major diameter of the valve sleeve, while the low pressure equalization groove, the outer high pressure equalization groove and the inner high pressure equalization groove are all opened on the minor diameter of the valve sleeve.
[0022] Secondly, this utility model embodiment provides a hydraulic breaker, including the aforementioned reversing valve.
[0023] The beneficial effects of the reversing valve provided by this utility model are as follows: Compared with the prior art, the reversing valve provided by this utility model replaces the existing pressure stabilizing groove with a low-pressure stabilizing channel and a high-pressure stabilizing channel, resulting in a smaller processing area on the outer wall of the valve sleeve, making it less prone to local deformation, and reducing the number of sharp edges, thereby effectively improving the situation where the valve sleeve surface is prone to roughening and effectively extending the service life of the workpiece.
[0024] The beneficial effects of the hydraulic breaker provided by this utility model are as follows: Compared with the prior art, the hydraulic breaker provided by this utility model adopts the above-mentioned reversing valve, which effectively improves the situation that the valve sleeve surface is prone to scratching and effectively extends the service life of the workpiece. Attached Figure Description
[0025] Figure 1 This is a cross-sectional view of an existing directional control valve.
[0026] Figure 2 This is a three-dimensional structural diagram of the valve sleeve in an existing directional control valve.
[0027] Figure 3 This is a cross-sectional view of the directional valve sleeve in the lower position according to Embodiment 1 of the present invention.
[0028] Figure 4 for Figure 3 Enlarged view of part A in the image;
[0029] Figure 5 This is a cross-sectional view of the directional valve sleeve in the upper position according to Embodiment 1 of the present utility model.
[0030] Figure 6 for Figure 5 Enlarged view of part B in the image;
[0031] Figure 7 for Figure 5 A schematic diagram of the cross-sectional structure along line AA in the diagram;
[0032] Figure 8 A three-dimensional structural diagram of the valve core of the directional valve provided in Embodiment 1 of this utility model;
[0033] Figure 9A three-dimensional structural diagram of the valve sleeve of the directional valve provided in Embodiment 1 of this utility model;
[0034] Figure 10 This is a cross-sectional view of the directional valve sleeve in the lower position according to Embodiment 2 of this utility model.
[0035] Figure 11 for Figure 10 Enlarged view of section C in the image;
[0036] Figure 12 This is a cross-sectional view of the directional valve sleeve in the upper position according to Embodiment 2 of this utility model.
[0037] Figure 13 for Figure 12 Enlarged view of part D in the image;
[0038] Figure 14 This is a three-dimensional structural diagram of the valve sleeve of the directional valve provided in Embodiment 2 of this utility model;
[0039] Explanation of reference numerals in the attached figures:
[0040] 10. Valve body; 20. Valve core; 21. High-pressure connecting channel; 30. Valve sleeve; 41. High-pressure chamber;
[0041] 42. Signal cavity; 43. Pressure relief cavity; 44. Oil passage cavity; 51. First force-bearing surface;
[0042] 52. First equalizing groove; 53. Second stress-bearing surface; 54. Second equalizing groove; 55. Stabilizing groove;
[0043] 60. Low-voltage stabilizing channel; 61. Low-voltage stabilizing main port; 62. Low-voltage branch port; 63. Signal branch port;
[0044] 70. High-pressure stabilizing channel; 81. Low-pressure equalizing groove; 82. External high-pressure equalizing groove;
[0045] 83. Internal high-voltage equalization tank; 84. High-voltage interconnection equalization tank; 85. Signal equalization tank. Detailed Implementation
[0046] To make the technical problems, technical solutions, and beneficial effects of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.
[0047] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is actually illustrative only and is in no way intended to limit this application or its application or use. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.
[0048] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.
[0049] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.
[0050] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.
[0051] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, and the spatial relative descriptions used herein will be interpreted accordingly.
[0052] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.
[0053] Please refer to the following: Figures 1 to 2 The present invention describes a conventional directional valve for a hydraulic breaker. The directional valve includes a valve body 10, a valve core 20, and a valve sleeve 30. The valve core 20 is fixedly disposed within the valve body 10, and the valve sleeve 30 is slidably disposed between the valve body 10 and the valve core 20. The valve body 10, the valve core 20, and the valve sleeve 30 cooperate to form a high-pressure chamber 41, a pressure relief chamber 43, and a signal chamber 42. The valve core 20 has an oil passage chamber 44 communicating with the high-pressure chamber 41, and the signal chamber 42 is disposed between the high-pressure chamber 41 and the pressure relief chamber 43. The high-pressure chamber 41 is connected to the high-pressure oil circuit through a high-pressure channel, the pressure relief chamber 43 is connected to the return oil circuit through a return oil channel, and the signal chamber 42 is connected to the cylinder body through a signal channel. The valve sleeve 30 has a first force-bearing surface 51 and a first pressure equalizing groove 52 in the high-pressure chamber 41 along the sliding direction, and a second force-bearing surface 53 and a second pressure equalizing groove 54 in the signal chamber 42. The first force-bearing surface 51, the second force-bearing surface 53, the first pressure equalizing groove 52 and the second pressure equalizing groove 54 are all annular. One side of the first pressure equalizing groove 52 is flush with the first force-bearing surface 51, and one side of the second pressure equalizing groove 54 is flush with the second force-bearing surface 53. The area of the second force-bearing surface 53 is larger than the area of the first force-bearing surface 51. As the piston changes position in the cylinder body, the signal chamber 42 is connected to the high-pressure oil circuit or the return oil circuit, thereby driving the valve sleeve 30 to slide relative to the fixed component and complete the reversing operation.
[0054] Specifically, the valve sleeve 30 moves towards the side of the high-pressure chamber 41 away from the low-pressure chamber 43 until it abuts against the valve core 20. At this time, the valve sleeve 30 is said to be in the upper position. The signal chamber 42 is connected to the return oil circuit and is in a low-pressure state. The pressure on the second force surface 53 is less than the pressure on the first force surface 51, causing the valve sleeve 30 to move towards the side where the pressure relief chamber 43 is located until it abuts against the valve body. At this time, the valve sleeve 30 is said to be in the lower position. The reversing valve completes one reversal, driving the piston in the cylinder to move. After the piston moves to the position, it will connect the signal chamber 42 to the high-pressure oil circuit. The signal chamber 42 is in a high-pressure state and the pressure is equal to that of the high-pressure chamber 41. Since the area of the second force surface 53 is larger than that of the first force surface 51, the valve sleeve 30 will move from the lower position to the upper position, completing another reversal and driving the piston in the cylinder to move in the opposite direction. This cycle repeats.
[0055] like Figure 2 As shown, a pressure stabilizing groove 55 is formed on the surface of the valve sleeve 30. When the moving part is in the lower position, the signal cavity 42 is connected to the pressure relief cavity 43 through the pressure stabilizing groove 55; when the moving part is in the upper position, the signal cavity 42 is connected to the high pressure cavity 41 through the pressure stabilizing groove 55.
[0056] Please refer to the following: Figures 3 to 9 The reversing valve provided by this utility model will now be described. The reversing valve includes a valve body 10, a valve core 20, and a valve sleeve 30. The valve core 20 is fixedly disposed inside the valve body 10, and the valve sleeve 30 is slidably disposed between the valve body 10 and the valve core 20. The valve body 10, the valve core 20, and the valve sleeve 30 cooperate to form a high-pressure chamber 41, a pressure relief chamber 43, and a signal chamber 42. The valve core 20 is provided with an oil passage chamber 44 communicating with the high-pressure chamber 41, and the signal chamber 42 is disposed between the high-pressure chamber 41 and the pressure relief chamber 43.
[0057] The valve sleeve 30 has a low-pressure stabilizing channel 60 and a high-pressure stabilizing channel 70. The low-pressure stabilizing channel 60 has two openings, namely a low-pressure opening and a low-pressure signal opening, and both the low-pressure opening and the low-pressure signal opening are located on the outer wall of the valve sleeve 30. The low-pressure signal opening is connected to the signal cavity 42. The high-pressure stabilizing channel 70 penetrates the side wall of the valve sleeve 30 and one end is connected to the signal cavity 42. The valve core 20 has a high-pressure connecting channel 21 that penetrates the valve core 20. One end of the high-pressure connecting channel 21 is connected to the oil passage cavity 44.
[0058] Among them, such as Figure 3 and Figure 4 As shown, when the valve sleeve 30 is in the lower position, the low-pressure port is connected to the pressure relief chamber 43, the low-pressure signal port is connected to the signal chamber 42, and the high-pressure communication channel 21 is blocked by the valve sleeve 30, so that the signal chamber 42 is connected to the pressure relief chamber 43 and isolated from the high-pressure chamber 41; Figure 5 and Figure 6As shown, when the valve sleeve 30 is in the upper position, the high pressure stabilizing channel 70 is connected to the high pressure connecting channel 21, and the low pressure port is separated from the pressure relief chamber 43, so that the signal chamber 42 is connected to the high pressure chamber 41 and isolated from the pressure relief chamber 43.
[0059] The beneficial effects of the reversing valve provided in this embodiment of the present invention are as follows: Compared with the prior art, the reversing valve provided in this embodiment of the present invention replaces the existing pressure stabilizing groove 55 with the low-pressure stabilizing channel 60 and the high-pressure stabilizing channel 70, resulting in a smaller processing area on the outer wall of the valve sleeve 30, making it less prone to local deformation, and reducing the number of sharp edges, thereby effectively improving the situation where the surface of the valve sleeve 30 is prone to roughening, and effectively extending the service life of the workpiece.
[0060] like Figures 3 to 6 As shown, in a specific embodiment of the reversing valve provided in this utility model, the low-pressure stabilizing channel 60 includes a low-pressure branch hole 62, a signal branch hole 63, and a low-pressure stabilizing main hole 61. The low-pressure branch hole 62 and the signal branch hole 63 are both opened on the outer wall of the valve sleeve 30, and the low-pressure stabilizing main hole 61 is opened inside the valve sleeve 30 and is connected and communicates with the low-pressure branch hole 62 and the signal branch hole 63.
[0061] Specifically, during the processing of the low-pressure stabilizing main hole 61, a blind hole of a certain depth is drilled from the end face of the valve sleeve 30, and then the hole on the end face is sealed by welding, installing a plug, or installing a screw plug; and the extension direction of the low-pressure stabilizing main hole 61 can be parallel to the axis of the valve sleeve 30 or set at a certain angle, so as to achieve the effect of connecting the low-pressure branch hole 62 and the signal branch hole 63.
[0062] like Figure 7 and Figure 9 As shown, in a specific embodiment of the reversing valve provided in this utility model, there is one or more low-pressure stabilizing channels 60. When there are multiple low-pressure stabilizing channels 60, the low-pressure stabilizing channels 60 are uniformly arranged circumferentially along the valve sleeve 30.
[0063] Specifically, such as Figure 7 and Figure 9 As shown, in a specific embodiment of the reversing valve provided in this utility model, there are four low-pressure stabilizing channels 60. The four low-pressure stabilizing channels 60 are evenly arranged around the valve sleeve 30 to effectively ensure the pressure stabilization effect and ensure the uniformity of radial force on the valve sleeve 30.
[0064] like Figure 7 and Figure 8 As shown, in a specific embodiment of the reversing valve provided in this utility model, there are one or more high-pressure stabilizing channels 70. When there are multiple high-pressure stabilizing channels 70, the high-pressure stabilizing channels 70 are evenly arranged along the circumference of the valve sleeve 30.
[0065] Specifically, such as Figure 7 and Figure 8 As shown, in a specific embodiment of the reversing valve provided in this utility model, there are two high-pressure stabilizing channels 70, which are evenly arranged along the circumference of the valve sleeve 30.
[0066] like Figure 8 and Figure 9 As shown, in a specific embodiment of the reversing valve provided in this utility model, the valve sleeve 30 is provided with a low-pressure equalizing groove 81 at the low-pressure port, a second equalizing groove 54 at the low-pressure signal port, and an outer high-pressure equalizing groove 82 and an inner high-pressure equalizing groove 83 at both ends of the high-pressure connecting channel 21. The outer high-pressure equalizing groove 82 is located between the low-pressure equalizing groove 81 and the signal equalizing groove 85. The outer wall of the valve core 20 is provided with a high-pressure connecting equalizing groove 84 at one end of the high-pressure connecting channel 21.
[0067] Specifically, the low-pressure equalizing groove 81 is connected to the low-pressure orifice, the signal equalizing groove 85 is connected to the low-pressure signal orifice, the external high-pressure equalizing groove 82 and the internal high-pressure equalizing groove 83 are connected to both ends of the high-pressure connecting channel 21 respectively, and the high-pressure connecting equalizing groove 84 is connected to the high-pressure connecting channel 21.
[0068] It should be noted that the edges of the pressure equalization grooves are all rounded. By setting the pressure equalization grooves, the uniformity of oil pressure in the circumference of the valve sleeve 30 can be effectively improved, the uniformity of force on the circumference of the valve sleeve 30 can be further improved, and the situation of easy scratching of the valve sleeve 30 can be further improved.
[0069] It should be noted that in this embodiment, the signal equalization groove 85 coincides with the second equalization groove 54.
[0070] like Figure 3 and Figure 4 As shown, when the valve sleeve 30 is in the lower position, the low-pressure equalizing groove 81, which is connected to the low-pressure port, is connected to the pressure relief chamber 43; the signal equalizing groove 85, which is connected to the low-pressure signal port, is connected to the signal chamber 42; and the high-pressure equalizing groove 84, which is connected to the high-pressure connecting channel 21, is blocked by the valve sleeve 30, thus making the signal chamber 42 connected to the pressure relief chamber 43 and isolated from the high-pressure chamber 41. Figure 5 and Figure 6 As shown, when the valve sleeve 30 is in the upper position, the inner high pressure equalizing groove 83 is aligned with the high pressure connecting equalizing groove 84, so that the high pressure stabilizing channel 70 is connected with the high pressure connecting channel 21. The low pressure equalizing groove 81 connected with the low pressure port and the signal equalizing groove 85 connected with the low pressure signal port are both located in the signal cavity 42 and separated from the pressure relief cavity 43, so that the signal cavity 42 is connected to the high pressure cavity 41 and isolated from the pressure relief cavity 43.
[0071] like Figure 10 and Figure 14As shown, in a specific embodiment of the reversing valve provided in this utility model, the signal equalization groove 85 and the second equalization groove 54 are arranged at intervals. The signal equalization groove 85 can be on either side of the second equalization groove 54, as long as the signal equalization groove 85 and the signal cavity 42 are connected when the valve sleeve 30 is in the lower position.
[0072] Furthermore, the signal equalization groove 85 is formed on the major diameter of the valve sleeve 30, while the low pressure equalization groove 81, the external high pressure equalization groove 82, and the internal high pressure equalization groove 83 are all formed on the minor diameter of the valve sleeve.
[0073] It should be noted that the diameter of the directional valve sleeve 30 on existing hydraulic breakers mostly changes in a single step along the axial direction. The large diameter of the valve sleeve 30 refers to the outer wall corresponding to the larger diameter part of the valve sleeve 30, and the small diameter of the valve sleeve 30 refers to the outer wall corresponding to the smaller diameter part of the valve sleeve 30.
[0074] Based on the same inventive concept, this utility model embodiment provides a hydraulic breaker, including the aforementioned reversing valve.
[0075] It should be noted that the connection and installation method between the reversing valve and the cylinder body in this embodiment is the same as that in the existing ones.
[0076] The beneficial effects of the hydraulic breaker provided by this utility model are as follows: Compared with the prior art, the hydraulic breaker provided by this utility model adopts the above-mentioned reversing valve, which effectively improves the situation that the surface of the valve sleeve 30 is prone to scratching and effectively extends the service life of the workpiece.
[0077] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A reversing valve, comprising a valve body, a valve core, and a valve sleeve, wherein the valve core is fixedly disposed within the valve body, and the valve sleeve is slidably disposed between the valve body and the valve core, the valve body and the valve core cooperating with the valve sleeve to form a high-pressure chamber, a pressure relief chamber, and a signal chamber, wherein the valve core has an oil passage chamber communicating with the high-pressure chamber, and the signal chamber is disposed between the high-pressure chamber and the pressure relief chamber, characterized in that: The valve sleeve has a low-pressure stabilizing channel and a high-pressure stabilizing channel. The low-pressure stabilizing channel has two openings, namely a low-pressure opening and a low-pressure signal opening, and both the low-pressure opening and the low-pressure signal opening are located on the outer wall of the valve sleeve. The low-pressure signal opening is connected to the signal cavity. The high-pressure stabilizing channel penetrates the side wall of the valve sleeve and is connected to the signal cavity at one end. The valve core has a high-pressure communication channel that penetrates the valve core, and one end of the high-pressure communication channel is connected to the oil passage. When the valve sleeve is in the lower position, the low-pressure port is connected to the pressure relief chamber, the low-pressure signal port is connected to the signal chamber, and the high-pressure communication channel is blocked by the valve sleeve, so that the signal chamber is connected to the pressure relief chamber and isolated from the high-pressure chamber; when the valve sleeve is in the upper position, the high-pressure stabilizing channel is connected to the high-pressure communication channel, and the low-pressure port is separated from the pressure relief chamber, so that the signal chamber is connected to the high-pressure chamber and isolated from the pressure relief chamber.
2. The reversing valve as described in claim 1, characterized in that, The low-pressure stabilizing channel includes a low-pressure branch hole, a signal branch hole, and a low-pressure stabilizing main hole. The low-pressure branch hole and the signal branch hole are both opened on the outer wall of the valve sleeve, and the low-pressure stabilizing main hole is opened inside the valve sleeve and is connected and communicates with the low-pressure branch hole and the signal branch hole.
3. The reversing valve as described in claim 1, characterized in that, The low-pressure stabilizing channel can be one or more. When there are multiple low-pressure stabilizing channels, the low-pressure stabilizing channels are evenly arranged along the circumference of the valve sleeve.
4. The reversing valve as described in claim 3, characterized in that, There are four low-pressure stabilizing channels, which are evenly arranged along the circumference of the valve sleeve.
5. The reversing valve as described in claim 1, characterized in that, The high-pressure stabilizing channel can be one or more. When there are multiple high-pressure stabilizing channels, the high-pressure stabilizing channels are evenly arranged along the circumference of the valve sleeve.
6. The reversing valve as described in claim 5, characterized in that, There are two high-pressure stabilizing channels, which are evenly arranged along the circumference of the valve sleeve.
7. The reversing valve according to any one of claims 1-6, characterized in that, The valve sleeve is provided with a low-pressure equalization groove at the low-pressure port, a signal equalization groove at the low-pressure signal port, and an outer high-pressure equalization groove and an inner high-pressure equalization groove at both ends of the high-pressure communication channel. The outer high-pressure equalization groove is located between the low-pressure equalization groove and the signal equalization groove. The outer wall of the valve core is provided with a high-pressure communication equalization groove at one end of the high-pressure communication channel.
8. The reversing valve as described in claim 7, characterized in that, The signal equalization slot is either aligned with or spaced apart from the second equalization slot.
9. The reversing valve as described in claim 8, characterized in that, The signal equalization groove is spaced apart from the second equalization groove, and the signal equalization groove is formed on the major diameter of the valve sleeve. The low pressure equalization groove, the outer high pressure equalization groove, and the inner high pressure equalization groove are all formed on the minor diameter of the valve sleeve.
10. A hydraulic breaker, characterized in that, Includes the directional valve as described in any one of claims 1-9.