Hydraulic breaker reversing valve assembly capable of reducing pressure deformation

Abstract

The utility model discloses a hydraulic breaker reversing valve assembly capable of reducing pressure deformation, comprising a valve seat, a valve cover, a reversing valve, a valve core, and a high-low pressure switching chamber; the reversing valve moves axially along the valve seat, and when the reversing valve moves to the leftmost end, the signal hole is connected to the oil return hole through the pressure-compensating hole, and the oil return hole is connected to the end face oil return groove through the end face hole, the pressure relief hole, and the end face connecting hole; when the reversing valve moves to the rightmost end, the signal hole is connected to the pressure-compensating hole and the pressure-maintaining hole, and the pressure-maintaining hole is also connected to the high-low pressure switching chamber. The utility model can reduce the influence of leakage on the pressure of the signal hole, and can ultimately effectively reduce the deformation of the reversing valve caused by the change of hydraulic pressure, avoid the hair pulling phenomenon, and increase the service life of the reversing valve.

Description

Technical Field

[0001] The utility model relates to the technical field of hydraulic breaker hammer reversing valves, in particular to a hydraulic breaker hammer reversing valve assembly capable of reducing pressure deformation. 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 may 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. Utility Model Content

[0005] The purpose of the utility model is to provide a hydraulic breaker reversing valve assembly that can reduce pressure deformation, reduce the influence of leakage on the pressure of the signal hole, and ultimately effectively reduce the deformation of the reversing valve caused by the change of hydraulic pressure, avoid the hair pulling phenomenon, and increase the service life of the reversing valve.

[0006] In order to achieve the above-mentioned purpose, the utility model provides the following technical solutions: a hydraulic breaker reversing valve assembly capable of reducing pressure deformation, 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 end face connecting hole and a pressure replenishing hole are provided in sequence from one end to the other end of the reversing valve, a valve core is provided in the reversing valve, and a pressure relief hole, a return hole, and a pressure relief hole are provided in sequence from one end to the other end of the valve core. Oil hole, pressure maintaining hole, an end surface hole connected with the pressure relief hole and the pressure replenishing hole is opened on the end of the valve core, a valve cover is provided on 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 with the oil return hole through the pressure replenishing hole, at this time, the oil return hole is connected with the end face oil return groove through the end surface hole, the pressure relief hole, and the end face connecting hole, when the reversing valve moves to the rightmost end, the signal hole is connected with the pressure maintaining hole through the pressure replenishing hole, at this time, the pressure maintaining hole is also connected with the high and low pressure switching chamber.

[0007] Further preferably, the number of the oil return holes is one or more. When there are multiple oil return holes, the oil return holes are evenly distributed along the circumference of the valve core.

[0008] Further preferably, the number of the pressure relief holes corresponds to the number of the oil return holes.

[0009] Further preferably, the number of the end surface holes corresponds to the number of the oil return holes, and each end surface hole is connected to the corresponding pressure relief hole and the corresponding oil return hole.

[0010] Further preferably, the number of the pressure-compensating holes is one or more. When there are more than one pressure-compensating holes, the pressure-compensating holes are evenly distributed along the circumference of the reversing valve.

[0011] Further preferably, a connecting groove for connecting the pressure-maintaining hole and the oil return hole is also provided on the inner periphery of the reversing valve.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] 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. The reversing valve assembly of the utility model replaces the pressure-maintaining groove and the oil return groove with a pressure-replenishing hole, a pressure-maintaining hole, an end hole, a pressure relief hole and an oil return hole, and uses a hole structure instead of a groove structure. The hole structure has advantages in terms of the reduction amount and uniform force of the reversing valve, thereby reducing the deformation of the reversing valve caused by the change in hydraulic pressure and avoiding the hair pulling phenomenon.

[0014] 2. The utility model adopts structures such as pressure-compensating holes, pressure-maintaining holes, end face holes, pressure relief holes and oil return holes, which can make the leaked hydraulic oil reach the pressure-compensating hole of the reversing valve through the signal hole first, and then pass through the oil return hole on the valve core, and then pass through the end face hole, pressure relief hole, end face connecting hole in sequence, and finally enter the end face oil return groove for connection, thereby realizing the connection between the signal hole and the end face oil return groove. This design can reduce the influence of the leakage on the pressure of the signal hole, and finally can 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.

[0015] 3. In order to better reduce the influence of leakage on the pressure of the signal hole, the utility model has one or more oil return holes. When there are multiple oil return holes, the oil return holes are evenly distributed along the circumference of the valve core; the number of pressure relief holes corresponds to the number of oil return holes; the number of end surface holes corresponds to the number of oil return holes, and each end surface hole is connected to the corresponding pressure relief hole and the corresponding oil return hole.

[0016] 4. In order to match the number of oil return holes, the number of pressure-compensating holes in the utility model also corresponds to the number of oil return holes, which can be 1 or more. When there are multiple pressure-compensating holes, they are evenly distributed along the circumference of the reversing valve.

[0017] 5. In order to better ensure that the pressure-maintaining hole and the oil return hole are connected, a connecting groove for connecting the pressure-maintaining hole and the oil return hole is also provided on the inner periphery of the reversing valve.

[0018] 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

[0019] Figure 1 It is a reversing valve assembly for a common hydraulic breaker;

[0020] Figure 2 This is a schematic diagram of the internal structure of the hydraulic breaker reversing valve assembly of the utility model;

[0021] Figure 3 This is an enlarged schematic diagram of the oil return hole, pressure-maintaining hole, pressure-compensating hole and other structures in the utility model;

[0022] Figure 4 This is a schematic diagram of the valve core structure in the utility model;

[0023] Figure 5 It is a three-dimensional structural schematic diagram of the valve core in the utility model;

[0024] Figure 6 This is a schematic diagram of the structure of the reversing valve of the utility model;

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the reversing valve of the utility model;

[0026] Figure 8 This is a schematic diagram of the assembly structure of the valve core and the reversing valve of the utility model;

[0027] Fig. 9 The utility model is a schematic diagram of the three-dimensional external structure of the hydraulic breaker reversing valve assembly.

[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. oil return hole; 22. pressure holding hole; 23. end face hole; 24. connecting groove; 25. pressure relief hole; 26. high and low pressure switching hole; 3. valve cover; 4. reversing valve; 41. pressure replenishing hole; 42. end face connecting 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. This will cause the reversing valve to deform due to changes in hydraulic pressure, thereby shortening the service life of the reversing valve.

[0032] Example

[0033] In order to solve the above problems, the utility model provides a technical solution: please refer to Figure 2-9 A hydraulic breaker reversing valve assembly capable of reducing pressure deformation comprises a valve seat 1, a valve cover 3, a reversing valve 4, a valve core 2, and a high-low pressure switching chamber 5; 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 in sequence from one end to the other end, a reversing valve 4 is provided in the valve seat 1, and an end face connecting hole 42 and a pressure compensation hole 41 are provided on the reversing valve 4 in sequence from one end to the other end, a valve core 2 is provided in the reversing valve 4, and a pressure relief hole 25, an oil return hole 21, and a pressure maintaining hole 22 are provided on the valve core 2 in sequence from one end to the other end, and the valve core 2 is provided with a pressure relief hole 25, an oil return hole 21, and a pressure maintaining hole 2 ... a signal hole 12, a normally high pressure hole 13, and a main oil return groove 14 in sequence from one end to the other end, and the valve seat 1 is provided with a reversing valve 4 in the valve seat 1, and the valve core 2 is provided with a pressure relief hole 25, a signal hole 12, a normally high pressure hole 13, and a main oil return groove An end hole 23 connected with the pressure relief hole 25 and the pressure compensation hole 41 is opened on the end part, and a valve cover 3 abutting against the valve core 2 is provided at the end part of the valve seat 1. A high-low pressure switching chamber 5 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 connected with the oil return hole 21 through the pressure compensation hole 41. At this time, the oil return hole 21 is connected with the end face oil return groove 11 through the end hole 23 and the pressure relief hole 25. When the reversing valve 4 moves to the rightmost end, the signal hole 12 is connected with the pressure maintaining hole 22 through the pressure compensation hole 41. At this time, the pressure maintaining hole 22 is also connected with the high-low pressure switching chamber 5.

[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 reversing valve 4 is located on the left side, the high-low pressure switching hole 26 is connected to the main oil return groove 14, so that the high-low pressure switching chamber 5 is in a lower pressure state; and at this time, the signal hole 12 is connected to the oil return hole 21 through the pressure compensation hole 41, and the oil return hole 21 is connected to the end face oil return groove 11 through the end face hole 23, the pressure relief hole 25, and the end face connecting hole 42.

[0036] When the piston rises and gradually opens the connecting channel between the signal hole 12 and the normally high pressure hole 13, 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 reaches the pressure-compensating hole 41 of the reversing valve 4 through the signal hole 12. At this time, the pressure-compensating hole 41 is connected to the oil return hole 21 on the valve core 2, and the oil return hole 21 is connected to the end face oil return groove 11 through the end face hole 23, the pressure relief hole 25, and the end face connecting hole 42. Thus, the signal hole 12 is connected to the end face oil return groove 11. This design can reduce the influence of the leakage on the pressure of the signal hole 12.

[0037] When the piston starts to descend, the reversing valve 4 is at the far right end, and the signal hole 12 is connected to the pressure-maintaining hole 22 of the valve core 2 through the pressure-compensating hole 41 of the reversing valve 4. At this time, the pressure-maintaining hole 22 is connected to the high-low pressure switching chamber 5, and the high-low pressure switching chamber 5 is in a high-pressure state, which can provide pressure to the pressure-maintaining hole 22. After the piston closes the signal hole 12 and the connection with the normally high pressure of the middle cylinder body, the signal hole 12 still remains in a high-pressure state, ensuring continuous pressure supply during the piston stroke, allowing the hydraulic breaker to strike powerfully.

[0038] The utility model replaces the original pressure-maintaining groove and oil return groove of the reversing valve with pressure-replenishing holes, pressure-maintaining holes, end holes, pressure relief holes and oil return holes in the hydraulic breaker reversing valve assembly which can reduce pressure deformation, can effectively reduce the deformation of the reversing valve caused by the change of hydraulic pressure, avoids the burring phenomenon of the reversing valve at the pressure-maintaining groove and the oil return groove, and increases the service life of the reversing valve.

[0039] In order to better reduce the influence of leakage on the pressure of the signal hole 12, the number of oil return holes 21 is one or more. When there are multiple oil return holes 21, the oil return holes 21 are evenly distributed along the circumference of the valve core 2; the number of pressure relief holes 25 corresponds to the number of oil return holes 21; the number of end surface holes 23 corresponds to the number of oil return holes 21, and each end surface hole 23 is connected to the corresponding pressure relief hole 25 and the corresponding oil return hole 21.

[0040] In order to match the number of the oil return holes 21 , the number of the pressure-compensating holes 41 also corresponds to the number of the oil return holes 21 , which can be one or more. When there are multiple pressure-compensating holes 41 , they are evenly distributed along the circumference of the reversing valve 4 .

[0041] In order to better ensure that the pressure-maintaining hole 22 is connected to the oil return hole 21 , a connecting groove 24 for connecting the pressure-maintaining hole 22 and the oil return hole 21 is further provided on the inner periphery of the reversing valve 4 .

[0042] 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.

[0043] 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.

[0044] 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 hydraulic breaker reversing valve assembly capable of reducing pressure deformation, 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; an end face connecting hole and a pressure-compensating hole are provided in sequence from one end to the other end on the reversing valve; a valve core is provided in the reversing valve; a pressure relief hole, an oil return hole, and a pressure-maintaining hole are provided in sequence from one end to the other end on the valve core; an end face hole connected to the pressure relief hole and the pressure-compensating hole is provided on the end of the valve core; a valve cover abutting against the valve core is provided at the end of the valve seat; 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 to the oil return hole through the pressure-compensating hole; at this time, the oil return hole is connected to the end face oil return groove through the end face hole, the pressure relief hole, and the end face connecting hole; when the reversing valve moves to the rightmost end, the signal hole is connected to the pressure-maintaining hole through the pressure-compensating hole; at this time, the pressure-maintaining hole is also connected to the high-low pressure switching chamber.

2. The hydraulic breaker reversing valve assembly capable of reducing pressure deformation according to claim 1 is characterized in that: The number of the oil return holes is one or more. When there are more than one oil return holes, the oil return holes are evenly distributed along the circumference of the valve core.

3. The hydraulic breaker reversing valve assembly capable of reducing pressure deformation according to claim 2 is characterized in that: The number of the pressure relief holes corresponds to the number of the oil return holes.

4. The hydraulic breaker reversing valve assembly capable of reducing pressure deformation according to claim 3 is characterized in that: The number of the end surface holes corresponds to the number of the oil return holes, and each end surface hole is connected to the corresponding pressure relief hole and the corresponding oil return hole.

5. The hydraulic breaker reversing valve assembly capable of reducing pressure deformation according to claim 1 is characterized in that: The number of the pressure-compensating holes is one or more. When there are more than one pressure-compensating holes, the pressure-compensating holes are evenly distributed along the circumference of the reversing valve.

6. The hydraulic breaker reversing valve assembly capable of reducing pressure deformation according to claim 1 is characterized in that: A connecting groove for connecting the pressure-maintaining hole and the oil return hole is also provided on the inner periphery of the reversing valve.

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