Pressure-maintaining hydraulic breaker reversing valve assembly

Abstract

The utility model discloses a pressure-maintaining hydraulic breaker reversing valve assembly, including a valve seat, a valve cover, a reversing valve, a valve core, and a high-low pressure switching chamber; when the reversing valve moves to the leftmost end, the signal hole is connected to the annular oil return groove, and the pressure-compensating oil return groove is connected to the end surface oil return groove; when the reversing valve moves to the rightmost end, the signal hole is connected to the oil return groove, and the pressure-compensating hole is connected to the pressure-maintaining hole. The utility model can reduce the influence of leakage on the pressure of the signal hole, and ultimately can effectively reduce the deformation of the reversing valve caused by the change of hydraulic pressure, avoid the hair pulling phenomenon, increase the service life of the reversing valve, can ensure the long-term pressure maintenance of the signal hole, thereby improving the pressure maintenance effect, ensuring the continuous pressure supply during the piston stroke, and allowing the hydraulic breaker to strike powerfully.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic breaker hammer reversing valves, in particular to a pressure-maintaining hydraulic breaker hammer reversing valve assembly. Background Art

[0002] like Figure 1 As shown, the reversing valve assembly of the hydraulic breaker consists of four parts: the valve cover, the valve seat, the valve core and the reversing valve. The movement of the hydraulic breaker reversing valve should be adjusted in accordance with the specific movement of the piston. When the piston rises and approaches the signal hole, the sealing amount between the signal hole and the normal high pressure gradually decreases, causing the pressure of the signal hole to gradually increase. At this time, the reversing valve is at the far left end, and the signal hole is connected to the end face oil return through the oil return groove, so that the pressure of the signal hole is kept at a low level, avoiding the reversing valve from moving to the right due to the leakage between the signal hole and the normal high pressure, and avoiding premature opening of the reversing valve. If the reversing valve opens prematurely due to leakage, the piston stroke will be shorter than the design value, which will cause the piston to strike weakly in the mildest case and abnormal piston strike in the worst case. When the piston rises and opens the connection channel between the signal hole and the normally high pressure, the signal hole is converted to a high pressure state, and the reversing valve moves from left to right, closing the connection channel between the high and low pressure switching chamber and the main return oil, opening the connection channel between the high and low pressure switching hole and the normally high pressure, and the high and low pressure switching chamber is converted to a high pressure state. The piston descends and closes the signal hole. At this time, the signal hole is in a high pressure state through the pressure holding groove to prevent the reversing valve from closing prematurely. If the reversing valve is closed prematurely at this time, the high and low pressure switching chamber will be converted to a low pressure state during the piston stroke, causing the piston to slow down, which may cause the piston to strike weakly at best, or abnormally at worst. Therefore, the pressure holding groove and the oil return groove are important components of the reversing valve assembly.

[0003] The utility model patent with publication number CN217327899U discloses a hydraulic breaker reversing valve assembly. The utility model is provided with an annular oil return groove (sometimes also called end face oil return), a pressure relief groove (sometimes also called oil return groove) and a pressure maintaining groove to increase the return oil flow rate. A boss is provided on the inner periphery of the valve seat to increase the valve cover installation stability, thereby improving the stability and service life of the reversing valve assembly, thereby ensuring the stable operation of the hydraulic breaker.

[0004] However, in practice, it is found that the surfaces of the pressure-maintaining groove and the oil return groove will be roughened. This may be because the surface of the reversing valve is deformed when the pressure-maintaining groove and the oil return groove are opened, resulting in friction with the valve seat when the reversing valve moves. This will cause the reversing valve to deform due to changes in hydraulic pressure, thereby shortening the service life of the reversing valve. In addition, the existing hydraulic breaker reversing valve assembly has a poor pressure-maintaining effect and a short pressure-maintaining time, and cannot guarantee continuous pressure supply during the piston stroke, allowing the hydraulic breaker to strike powerfully. Utility Model Content

[0005] The utility model aims to provide a pressure-maintaining hydraulic breaker hammer reversing valve assembly, which can reduce the influence of leakage on the pressure of the signal hole, and finally effectively reduce the deformation of the reversing valve caused by the change of hydraulic pressure, avoid the phenomenon of hair pulling, and increase the service life of the reversing valve; it can also ensure the long-term pressure maintenance of the signal hole, thereby improving the pressure maintenance effect, ensuring the continuous pressure supply during the piston stroke, and allowing the hydraulic breaker to strike powerfully.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a pressure-maintaining hydraulic breaker reversing valve assembly, comprising a valve seat, a valve cover, a reversing valve, a valve core, and a high-low pressure switching chamber; the inner circumference of the valve seat is provided with an end face oil return groove, a signal hole, a normally high pressure hole, and a main oil return groove in sequence from one end to the other end, a reversing valve is provided in the valve seat, an oil return groove is provided on one end of the reversing valve, the oil return groove is composed of a pressure-replenishing oil return groove and an annular oil return groove, the annular oil return groove is opened around the outer circumference of the reversing valve, the annular oil return groove is connected with the pressure-replenishing oil return groove, and the pressure-replenishing oil return groove is connected with the pressure-replenishing oil return groove. The oil return groove is arranged close to the end face oil return groove, a pressure-compensating hole is provided on the pressure-compensating oil return groove, a valve core is provided in the reversing valve, a pressure-maintaining hole and a high-and-low-pressure switching hole are provided on the valve core in sequence from one end to the other end, a valve cover is provided at the end of the valve seat to abut against the valve core, a high-and-low-pressure switching chamber is formed between the inside of the valve core and the valve cover, when the reversing valve moves to the leftmost end, the signal hole is connected to the annular oil return groove, and the pressure-compensating oil return groove is connected to the end face oil return groove, when the reversing valve moves to the rightmost end, the signal hole is connected to the oil return groove, and the pressure-compensating hole is connected to the pressure-maintaining hole.

[0007] Further preferably, the number of the pressure-compensating oil return grooves is one or more, and all of them are connected to the annular oil return groove.

[0008] Further preferably, when there are multiple pressure-compensating oil return grooves, the pressure-compensating oil return grooves are evenly distributed along the circumference of the reversing valve.

[0009] Further preferably, each of the pressure-compensating oil return grooves is provided with one or more pressure-compensating holes, and a certain interval is provided between adjacent pressure-compensating holes.

[0010] Further preferably, a connecting groove is provided on the valve core, and the connecting groove is provided around the outer circumference of the valve core.

[0011] Further preferably, the pressure maintaining hole is arranged in the connecting groove.

[0012] Further preferably, the number of the pressure-maintaining holes corresponds to the number of the pressure-compensating oil return grooves, which is 1 or more, and is evenly distributed along the circumference of the valve core.

[0013] Compared with the prior art, the beneficial effects of the utility model are:

[0014] 1. Existing reversing valves all use pressure-maintaining grooves and oil return grooves, and the groove structure deforms greatly under a large hydraulic pressure, resulting in a hair pulling phenomenon. Therefore, the utility model replaces the original pressure-maintaining groove and oil return groove of the reversing valve with a design in which a pressure-replenishing oil return groove and a pressure-replenishing hole are provided on the reversing valve and a pressure-maintaining hole is opened on the valve core. Adding holes to the grooves and using a hole structure instead of a groove structure are advantageous in terms of the reduction amount and uniform force of the reversing valve, and can effectively reduce the deformation of the reversing valve caused by changes in hydraulic pressure, avoid the hair pulling phenomenon of the reversing valve at the pressure-maintaining groove and the oil return groove, and increase the service life of the reversing valve.

[0015] 2. The existing reversing valve assemblies are all grooved on the reversing valve. The utility model adopts a structure in which holes are added to both the reversing valve and the valve core. Such a design is more conducive to reducing the amount of the reversing valve and uniform force.

[0016] 3. The utility model designs a pressure-compensating oil return groove, and opens multiple pressure-compensating holes on the pressure-compensating oil return groove, so that it can communicate with the pressure-maintaining hole of the valve core, and then the pressure-compensating hole and the high-low pressure switching chamber are connected. The high-low pressure switching chamber is in a high-pressure state, which can provide pressure to the pressure-compensating hole, so that after the piston closes the signal hole and the connection with the middle cylinder body at high pressure, the signal hole still remains in a high-pressure state. Multiple pressure-compensating holes with intervals can ensure long-term pressure maintenance of the signal hole, thereby improving the pressure maintenance effect, ensuring continuous pressure supply during the piston stroke, and allowing the hydraulic breaker to strike powerfully.

[0017] 4. In order to better ensure the connectivity between the pressure-compensating hole and the pressure-maintaining hole, the valve core is provided with a connecting groove, which is provided around the outer circumference of the valve core, and the pressure-maintaining hole is arranged in the connecting groove.

[0018] 5. The utility model sets one or more pressure-compensating holes in the pressure-compensating oil return groove. Such a design can also better reduce the influence of leakage on the pressure of the signal hole, and finally effectively reduce the deformation of the reversing valve caused by the change of hydraulic pressure.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a reversing valve assembly for a common hydraulic breaker;

[0021] Figure 2 This is a schematic diagram of the internal structure of the reversing valve assembly of the utility model;

[0022] Figure 3 It is an enlarged schematic diagram of the structures of the pressure-compensating hole, the pressure-maintaining hole, etc. in the utility model;

[0023] Figure 4This is a schematic diagram of the valve core structure in the utility model;

[0024] Figure 5 It is a three-dimensional structural schematic diagram of the valve core in the utility model;

[0025] Figure 6 This is a schematic diagram of the structure of the reversing valve of the utility model;

[0026] Figure 7 It is a three-dimensional structural schematic diagram of the reversing valve of the utility model;

[0027] Figure 8 This is a schematic diagram of the assembly structure of the valve core and the reversing valve of the utility model;

[0028] Among them, 1. valve seat; 11. end face oil return groove; 12. signal hole; 13. normal high pressure hole; 14. main oil return groove; 2. valve core; 21. pressure maintaining hole; 22. high and low pressure switching hole; 23. connecting groove; 3. valve cover; 4. reversing valve; 41. oil return groove; 411. pressure-compensating oil return groove; 412. annular oil return groove; 42. pressure-compensating hole; 5. high and low pressure switching chamber. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0030] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] The roughening phenomenon of the hydraulic breaker reversing valve assembly causes friction with the valve seat when the reversing valve moves, which will cause the reversing valve to deform due to changes in hydraulic pressure, thereby shortening the service life of the reversing valve. In addition, the existing hydraulic breaker reversing valve assembly has a poor pressure holding effect and a short pressure holding time, and cannot guarantee continuous pressure supply during the piston stroke, allowing the hydraulic breaker to strike powerfully.

[0032] Example

[0033] In order to solve the above problems, the utility model provides a technical solution: please refer to Figure 2-8 A pressure-maintaining hydraulic breaker reversing valve assembly comprises a valve seat 1, a valve cover 3, a reversing valve 4, a valve core 2, and a high-low pressure switching chamber; the inner circumference of the valve seat 1 is provided with an end face oil return groove 11, a signal hole 12, a normally high pressure hole 13, and a main oil return groove 14 from one end to the other end in sequence; a reversing valve 4 is provided in the valve seat 1, and an oil return groove 41 is provided on one end of the reversing valve 4, and the oil return groove 41 is composed of a pressure-replenishing oil return groove 411 and an annular oil return groove 412, and the annular oil return groove 412 is opened around the outer circumference of the reversing valve 4, and the annular oil return groove 412 is connected with the pressure-replenishing oil return groove 411, and the pressure-replenishing oil return groove 411 is close to the end face oil return groove 11 is arranged, a pressure-compensating hole 42 is opened on the pressure-compensating oil return groove 411, a valve core 2 is arranged in the reversing valve 4, a pressure-maintaining hole 42 and a high-low pressure switching hole 22 are opened on the valve core 2 from one end to the other end, a valve cover 3 is arranged at the end of the valve seat 1 to abut against the valve core 2, and a high-low pressure switching chamber is formed between the inside of the valve core 2 and the valve cover 3; when the reversing valve 4 moves to the leftmost end, the signal hole 12 is communicated with the annular oil return groove 412, and the pressure-compensating oil return groove 411 is communicated with the end face oil return groove 11; when the reversing valve 4 moves to the rightmost end, the signal hole 12 is communicated with the oil return groove 41, and the pressure-compensating hole 42 is communicated with the pressure-maintaining hole 42.

[0034] Working principle: The function of the reversing valve assembly is to switch the pressure of the high-low pressure switching chamber 5 according to the pressure strength of the signal hole 12, so as to achieve the effect of continuous impact of the hydraulic breaker. When the pressure of the signal hole 12 is low, if the reversing valve 4 is located on the right side, it will move to the left under the action of the pressure until the reversing valve 4 reaches the leftmost side; if the reversing valve 4 is located on the left side, the reversing valve 4 will be in a stationary state and remain motionless.

[0035] When the piston rises and gradually opens the connecting channel between the signal hole 12 and the normally high pressure hole 13, the reversing valve 4 is located on the left side, and the sealing amount between the signal hole 12 and the normally high pressure hole 13 gradually decreases, causing the pressure of the signal hole 12 to gradually increase, and the leaked hydraulic oil passes through the signal hole 12 to the annular oil return groove 412 of the reversing valve 4. At this time, the end face oil return groove 11 and the pressure-compensating oil return groove 411 are connected, so that the signal hole 12 can be in a low-pressure state to avoid leakage from opening the reversing valve in advance.

[0036] When the piston begins to descend, the reversing valve 4 is at the far right end, and the signal hole 12 is connected to the pressure-maintaining hole 21 of the valve core 2 through the pressure-maintaining hole 42 of the reversing valve 4, thereby connecting the pressure-maintaining hole 42 to the high-low pressure switching chamber. The high-low pressure switching chamber is in a high-pressure state, which can provide pressure to the pressure-maintaining hole 42, so that after the piston closes the connection between the signal hole and the middle cylinder body at high pressure, the signal hole 12 still remains in a high-pressure state. Multiple pressure-maintaining holes 42 with intervals (preferably 2 pressure-maintaining holes 42 in the figure) can ensure long-term pressure maintenance of the signal hole 12, improve the pressure maintenance effect, ensure continuous pressure supply during the piston stroke, and make the hydraulic breaker strike powerfully.

[0037] Since the structure of the groove deforms greatly under a large hydraulic pressure, thus causing the roughening phenomenon, the utility model replaces the original pressure-maintaining groove and oil return groove of the reversing valve with a design in which a pressure-replenishing oil return groove 411 plus a pressure-replenishing hole 42 is provided on the reversing valve and a pressure-maintaining hole 21 is opened on the valve core. Adding holes to the groove and using a hole structure instead of a groove structure are advantageous in terms of the reduction amount and uniform force of the reversing valve, and can effectively reduce the deformation of the reversing valve caused by changes in hydraulic pressure, avoid the roughening phenomenon of the reversing valve at the pressure-maintaining groove and the oil return groove, and increase the service life of the reversing valve.

[0038] In addition, grooves were previously made on the reversing valve, but the utility model adopts a structure in which holes are added to both the reversing valve and the valve core. Such a design is more conducive to reducing the amount of the reversing valve and uniform force.

[0039] In order to improve the pressure maintaining effect, the utility model has one or more pressure-compensating oil return grooves 411 , which are all connected to the annular oil return groove 412 . When there are multiple pressure-compensating oil return grooves 411 , the pressure-compensating oil return grooves 411 are evenly distributed along the circumference of the reversing valve 4 .

[0040] Each pressure-compensating oil return groove 411 is provided with one or more pressure-compensating holes 42, and a certain interval is provided between adjacent pressure-compensating holes 42, so as to ensure long-term pressure maintenance of the signal hole 12 and continuous pressure supply during the piston stroke, so that the hydraulic breaker can strike powerfully.

[0041] It should be noted that two pressure-compensating holes 42 are preferred in the figure. This does not limit the protection scope of the present utility model, but is used as an example to better introduce the working principle. The number of pressure-compensating holes 42 can be set according to the on-site conditions.

[0042] In order to better ensure the connectivity between the pressure-compensating hole 42 and the pressure-maintaining hole 21 , a connecting groove 23 is further provided on the valve core 2 . The connecting groove 23 is provided around the outer circumference of the valve core 2 , and the pressure-maintaining hole 42 is arranged in the connecting groove 23 .

[0043] In order to match the number of the pressure-compensating oil return grooves 411 , the number of the pressure-maintaining holes 42 corresponds to the number of the pressure-compensating oil return grooves 411 , which is one or more and is evenly distributed along the circumference of the valve core 2 .

[0044] In the description of the present invention, it is necessary to understand that the indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention 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 invention.

[0045] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pressure-maintaining hydraulic breaker reversing valve assembly, comprising a valve seat and a valve cover, characterized in that: Also includes: A reversing valve, a valve core, and a high-low pressure switching chamber; the inner circumference of the valve seat is provided with an end face oil return groove, a signal hole, a normally high pressure hole, and a main oil return groove in sequence from one end to the other end; a reversing valve is provided in the valve seat, and an oil return groove is provided on one end of the reversing valve, and the oil return groove is composed of a pressure-compensating oil return groove and an annular oil return groove, and the annular oil return groove is opened around the outer circumference of the reversing valve, the annular oil return groove is connected with the pressure-compensating oil return groove, and the pressure-compensating oil return groove is arranged close to the end face oil return groove, and an oil return groove is provided on the pressure-compensating oil return groove There is a pressure-compensating hole, a valve core is arranged in the reversing valve, a pressure-maintaining hole and a high-low pressure switching hole are sequentially opened on the valve core from one end to the other end, a valve cover is arranged at the end of the valve seat to abut against the valve core, and a high-low pressure switching chamber is formed between the inside of the valve core and the valve cover. When the reversing valve moves to the leftmost end, the signal hole is connected with the annular oil return groove, and the pressure-compensating oil return groove is connected with the end face oil return groove. When the reversing valve moves to the rightmost end, the signal hole is connected with the oil return groove, and the pressure-compensating hole is connected with the pressure-maintaining hole.

2. The pressure-maintaining hydraulic breaker reversing valve assembly according to claim 1 is characterized in that: The number of the pressure-compensating oil return grooves is one or more, and all of them are connected to the annular oil return groove.

3. The pressure-maintaining hydraulic breaker reversing valve assembly according to claim 2 is characterized in that: When there are multiple pressure-compensating oil return grooves, the pressure-compensating oil return grooves are evenly distributed along the circumference of the reversing valve.

4. The pressure-maintaining hydraulic breaker reversing valve assembly according to claim 1 or 2, characterized in that: Each of the pressure-compensating oil return grooves is provided with one or more pressure-compensating holes, and a certain interval is provided between adjacent pressure-compensating holes.

5. The pressure-maintaining hydraulic breaker reversing valve assembly according to claim 1 is characterized in that: The valve core is also provided with a connecting groove, which is arranged around the outer circumference of the valve core.

6. The pressure-maintaining hydraulic breaker reversing valve assembly according to claim 5 is characterized in that: The pressure maintaining hole is arranged in the connecting groove.

7. The pressure-maintaining hydraulic breaker reversing valve assembly according to claim 6 is characterized in that: The number of the pressure-maintaining holes corresponds to the number of the pressure-compensating oil return grooves, which is one or more and is evenly distributed along the circumference of the valve core.

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