A flow distribution impact device

Abstract

The present application discloses a flow distribution impact device, including a shell, a first limiting structure, a control valve core, a valve body structure, an impact piston, and a second limiting structure. The first limiting structure, the valve body structure, and the second limiting structure are positioned and assembled in the shell in sequence; the control valve core can be movably arranged in a first cavity formed by the first limiting structure and the valve body structure, and the impact piston can be movably arranged in a second cavity formed by the valve body structure and the second limiting structure; the valve body structure is provided with a first control flow channel, a second control flow channel, a third control flow channel, and a fourth control flow channel distributed along its circumference; the first annular gap between the shell and the valve body structure, and the second annular gap between the impact piston and the second limiting structure are connected through the first control flow channel. The above-mentioned flow distribution impact device can be driven by a single medium to realize high-frequency and high-energy impact of the impact piston, and the structure is relatively simple, easy to use, install and maintain, and can reduce the production cost to a certain extent.

Description

Technical Field

[0001] The present application relates to the technical field of impactors, and in particular to a flow distribution impact device. Background Art

[0002] The impactor is a commonly used rock-breaking device in drilling projects. It generates continuous impact loads through the high-pressure energy of the power transmission medium, thereby achieving rock breaking by impact.

[0003] Among them, the core component of the impactor is the flow distribution structure. The reciprocating motion of the impact piston, the continuity of the impact action, and the impact speed and energy all need to be controlled by the flow distribution structure. An impactor that efficiently breaks rocks cannot do without a flow distribution structure that is ingenious in structure and precisely controlled. In the prior art, CN203784016U discloses a valveless gas-liquid combined self-flow distribution impactor, including a cylinder body, an impact piston located in the working chamber of the cylinder body, a rear chamber energy storage container, and a nitrogen chamber. The technical solution is a joint control of two media, gas and liquid, and the movement of the impact piston needs to be driven and controlled by the energy storage container and the nitrogen chamber. Its structure is relatively complex and is not easy to install and maintain. Therefore, it is necessary for those skilled in the art to provide a flow distribution impact device with a simple structure and convenient installation and maintenance in a timely manner. Summary of the invention

[0004] The purpose of the present application is to provide a flow distribution impact device which can simplify the structure, facilitate installation and maintenance, and reduce production costs.

[0005] To achieve the above-mentioned purpose, the present application provides a flow distribution impact device, comprising a housing, a first limiting structure, a control valve core, a valve body structure, an impact piston, and a second limiting structure; the first limiting structure, the valve body structure, and the second limiting structure are positioned and assembled in the housing in sequence; the control valve core is movably disposed in a first cavity formed by the first limiting structure and the valve body structure, and the impact piston is movably disposed in a second cavity formed by the valve body structure and the second limiting structure; the valve body structure is provided with a first control flow channel, a second control flow channel, a third control flow channel, and a fourth control flow channel distributed along its circumference; a first annular gap between the housing and the valve body structure, and a second annular gap between the impact piston and the second limiting structure are connected through the first control flow channel;

[0006] When the first valve port formed by the control valve core and the valve body structure is closed, the control valve core moves to the left, and the impact piston moves to the left;

[0007] When the impact piston moves to the left until the second annular gap is connected to the second control flow channel, the transmission medium flows through the second control flow channel to the first step surface cavity of the control valve core, so that the control valve core moves to the right;

[0008] When the control valve core moves to the right until the first valve port is opened, the transmission medium flows through the third control flow channel to the first volume chamber on the left side of the impact piston, so that the impact piston moves to the right;

[0009] When the impact piston moves rightward until the first cavity is connected to the fourth control flow channel, the transmission medium flows to the second step surface cavity of the control valve core, so that the control valve core moves leftward;

[0010] When the control valve core moves to the left until the second valve port formed by the control valve core and the valve body structure is connected to the pressure relief hole of the control valve core, the transmission medium in the second control flow channel, the third control flow channel and the fourth control flow channel flows into the control valve core through the second valve port and the pressure relief hole to achieve pressure relief.

[0011] In some embodiments, in some embodiments, the valve body structure includes a valve body and a sliding rod, the sliding rod and the valve body are interference fit, and the first cavity is arranged between the valve body and the sliding rod.

[0012] In some embodiments, the number of first control channels, the number of second control channels, the number of third control channels, and the number of fourth control channels are all set to at least two, and at least two first control channels are evenly distributed along the circumference of the valve body, at least two second control channels are evenly distributed along the circumference of the valve body, at least two third control channels are evenly distributed along the circumference of the valve body, and at least two fourth control channels are evenly distributed along the circumference of the valve body.

[0013] In some embodiments, the control valve core, the sliding rod and the impact piston are provided with a communicating hollow cavity.

[0014] In some embodiments, the first limiting structure includes an end cover and a first sleeve, the first sleeve is fixed to a side of the end cover close to the control valve core, and the first sleeve and the control valve core form a buffer cavity to allow the control valve core to buffer and decelerate and stop at the left limit position.

[0015] In some embodiments, a filter is further included, and the filter is fixed to a side of the end cap facing away from the first sleeve to limit the end cap.

[0016] In some embodiments, the second limiting structure includes a second sleeve and a piston bushing, and the piston bushing is fixed to a side of the second sleeve away from the control valve core.

[0017] In some embodiments, seals are provided between the impact piston and the piston bushing, and between the valve body structure and the housing.

[0018] In some embodiments, the control valve core is provided with a recessed structure, the recessed structure is located between the first step surface cavity and the second step surface cavity, and the radial dimension of the outer wall of the recessed structure close to the first step surface cavity is greater than the radial dimension of the outer wall of the recessed structure close to the second step surface cavity.

[0019] In some embodiments, the impact piston includes a first piston segment, a second piston segment, a third piston segment and a fourth piston segment, and the first piston segment, the second piston segment, the third piston segment and the fourth piston segment are sequentially arranged in a direction away from the control valve core;

[0020] The radial dimension of the third piston segment is larger than that of the first piston segment, the radial dimension of the first piston segment is larger than that of the second piston segment, and the radial dimension of the second piston segment is larger than that of the fourth piston segment.

[0021] Compared with the above-mentioned background technology, the flow distribution impact device provided in the embodiment of the present application includes a shell, a first limiting structure, a control valve core, a valve body structure, an impact piston, and a second limiting structure. Among them, the first limiting structure, the valve body structure, and the second limiting structure are positioned and assembled in the shell in sequence; the control valve core can be movably arranged in the first cavity formed by the first limiting structure and the valve body structure, and the impact piston can be movably arranged in the second cavity formed by the valve body structure and the second limiting structure; the valve body structure is provided with a first control flow channel, a second control flow channel, a third control flow channel, and a fourth control flow channel distributed along its circumference; the first annular gap between the shell and the valve body structure, and the second annular gap between the impact piston and the second limiting structure are connected through the first control flow channel. In this way:

[0022] When the first valve port formed by the control valve core and the valve body structure is closed, the control valve core moves to the left, and the impact piston moves to the left; when the impact piston moves to the left until the second annular gap is connected to the second control flow channel, the transmission medium flows to the first step surface cavity of the control valve core through the second control flow channel, so that the control valve core moves to the right; when the control valve core moves to the right until the first valve port is opened, the transmission medium flows to the first cavity on the left side of the impact piston through the third control flow channel, so that the impact piston moves to the right; when the impact piston moves to the right until the first cavity is connected to the fourth control flow channel, the transmission medium flows to the second step surface cavity of the control valve core, so that the control valve core moves to the left; when the control valve core moves to the left until the second valve port formed by the control valve core and the valve body structure is connected to the pressure relief hole of the control valve core, the transmission medium in the second control flow channel, the third control flow channel and the fourth control flow channel flows to the control valve core through the second valve port and the pressure relief hole to achieve pressure relief.

[0023] Compared with the traditional flow distribution method using at least two transmission media (a combination of gas and liquid transmission media), the flow distribution impact device provided in the embodiment of the present application is driven by a single fluid transmission medium, such as a gas transmission medium or a liquid transmission medium. By controlling the reciprocating motion of the valve core, high-frequency and high-energy impact of the impact piston can be achieved. Since no other power source is required, there is no need to set up an energy storage container and an air chamber to drive and control the movement of the impact piston. The flow distribution impact device has a relatively simple structure, is easy to use, install and maintain, and can reduce production costs to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 It is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in the first state;

[0026] Figure 2 It is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in the second state;

[0027] Figure 3 It is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in the third state;

[0028] Figure 4 It is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in the fourth state;

[0029] Figure 5 This is a schematic cross-sectional view of a valve body of a flow distribution impact device in an embodiment of the present application;

[0030] Figure 6 It is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in pressure relief.

[0031] in:

[0032] 1-first control flow channel, 2-first valve port, 3-second control flow channel, 4-first branch, 5-first step surface cavity, 6-third control flow channel, 7-first cavity, 8-fourth control flow channel, 9-second branch, 10-second step surface cavity, 11-second valve port, 12-first annular gap, 13-second annular gap, 14-third step surface cavity, 15-pressure relief hole;

[0033] 101 - housing, 102 - end cover, 103 - first sleeve, 104 - control valve core, 105 - seal, 106 - valve body, 107 - slide rod, 108 - impact piston, 109 - second sleeve, 110 - piston bushing. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0035] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0036] It should be noted that the directional words such as "upper end, lower end, left side, right side" described below are all defined based on the drawings in the specification.

[0037] See also Figures 1 to 6 The flow distribution impact device provided in the embodiment of the present application includes a housing 101, a first limiting structure, a control valve core 104, a valve body structure, an impact piston 108, and a second limiting structure.

[0038] Among them, the first limiting structure, the valve body structure, and the second limiting structure are positioned and assembled in the shell 101 in sequence; the control valve core 104 is movably arranged in a first cavity formed by the first limiting structure and the valve body structure, and the impact piston 108 is movably arranged in a second cavity formed by the valve body structure and the second limiting structure; the valve body structure is provided with a first control channel 1, a second control channel 3, a third control channel 6 and a fourth control channel 8 distributed along its circumference; the first annular gap 12 between the shell 101 and the valve body structure, and the second annular gap 13 between the impact piston 108 and the second limiting structure are connected through the first control channel 1.

[0039] In some embodiments, the first limiting structure includes an end cap 102 and a first sleeve 103, the first sleeve 103 is fixed to a side of the end cap 102 close to the control valve core 104, when the control valve core 104 is about to reach the left limit position, the control valve core 104 and the first sleeve 103 form a buffer chamber, and the control valve core 104 stops at the left limit position after buffering and deceleration. In addition, the flow distribution impact device also includes a filter, the filter is fixed to the side of the end cap 102 away from the first sleeve 103, the filter is used to filter the fluid transmission medium, and the left side of the end cap 102 is limited by the filter.

[0040] In some embodiments, the valve body structure includes a valve body 106 and a sliding rod 107 , and the sliding rod 107 is interference fit with the valve body 106 .

[0041] In some embodiments, the second limiting structure includes a second sleeve 109 and a piston sleeve 110, the impact piston 108 passes through the second sleeve 109 and the piston sleeve 110, the piston sleeve 110 is fixed to the side of the second sleeve 109 away from the control valve core 104, and when the impact piston 108 is about to reach the right limit position, the impact piston 108, the piston sleeve 110 and the second sleeve 109 form a buffer chamber, and the impact piston 108 stops at the right limit position after buffering and deceleration.

[0042] It should be noted that the end cover 102 , the first sleeve 103 , the valve body 106 , the second sleeve 109 and the piston bushing 110 are positioned and assembled in the housing 101 in sequence, and the slide rod 107 is interference-fitted inside the valve body 106 .

[0043] In addition, multiple seals 105 are provided between the impact piston 108 and the piston bushing 110, and between the valve body 106 and the housing 101. Of course, multiple seals 105 are also provided at other locations requiring pressure-maintaining sealing to ensure the sealing between the mating surfaces that cooperate with each other.

[0044] In some embodiments, a recessed structure is provided in the middle portion of the control valve core 104, and the recessed structure is located between the first step surface cavity 5 and the second step surface cavity 10, and the radial dimension of the outer wall of the recessed structure close to the first step surface cavity 5 side (left side) is larger than the radial dimension of the outer wall of the recessed structure close to the second step surface cavity 10 side (right side), so that a third step surface cavity 14 can be formed in the middle portion of the control valve core 104.

[0045] It is understandable that if Figure 1 As shown, when the first annular gap 12 is connected to the second annular gap 13 through the first control channel 1, the high-pressure medium enters the third step surface cavity 14. Since the left side effective area of ​​the recessed structure is larger than the right side effective area of ​​the recessed structure, the pressure (combined force) on the control valve core 104 is directed to the left, causing the control valve core 104 to move to the left.

[0046] In some embodiments, the impact piston 108 includes a first piston segment, a second piston segment, a third piston segment and a fourth piston segment, and the first piston segment, the second piston segment, the third piston segment and the fourth piston segment are arranged in sequence along the direction away from the control valve core 104; the radial dimension of the third piston segment is greater than the radial dimension of the first piston segment, the radial dimension of the first piston segment is greater than the radial dimension of the second piston segment, the radial dimension of the second piston segment is greater than the radial dimension of the fourth piston segment, and any two adjacent piston segments among the first piston segment, the second piston segment, the third piston segment and the fourth piston segment are transitioned by a step surface.

[0047] It is understandable that if Figure 1As shown, the high-pressure medium in the second annular gap 13 acts on the impact piston 108. Since the radial dimension of the second piston segment is larger than the radial dimension of the fourth piston segment, the area of ​​the step surface between the third piston segment and the fourth piston segment is larger than the area of ​​the step surface between the third piston segment and the second piston segment. Therefore, the pressure (combined force) on the impact piston 108 is to the left, causing the impact piston 108 to return to the left.

[0048] It should be noted that no matter what state the flow distribution impact device is in, the first annular gap 12 between the shell 101 and the valve body 106 and the second annular gap 13 between the impact piston 108 and the second sleeve 109 are connected through the first control channel 1 inside the valve body 106 to form a normally high-pressure channel.

[0049] Since the control valve core 104 is accommodated in a first cavity formed by the first sleeve 103, the valve body 106, and the slide rod 107, and the impact piston 108 is accommodated in a second cavity formed by the valve body 106, the slide rod 107, the second sleeve 109, and the piston bushing 110, and only the control valve core 104 and the impact piston 108 are moving parts, the control valve core 104 can make left-right switching movements under the flow distribution action of the valve body 106 through the ingenious structural design of the recessed structure and multiple step surfaces, and the axial left-right limit positions of the control valve core 104 are stopped by the first sleeve 103 and the valve body 106, and the left-right switching movement of the control valve core 104 and the multiple control flow channels of the valve body 106 are switched, so as to drive the control impact piston 108 to realize high-frequency reciprocating impact; at the same time, the size design of the step annular surfaces of the control valve core 104 and the impact piston 108, the opening position of each control flow channel, etc., can realize the adjustment of the impact energy / frequency of the impact piston 108.

[0050] The working principle and specific implementation process of the flow distribution impact device in the embodiment of the present application are described in detail below:

[0051] like Figure 1 , which is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in the first state. Figure 1 The cross section shows the first control flow channel 1 of the valve body 106, the control valve core 104 is in the middle position, and the first valve port 2 formed by the control valve core 104 and the valve body 106 is closed. At this time, only the first control flow channel 1 is in a high-pressure state. Due to the difference in the design of the left and right step surfaces of the concave structure in the middle of the control valve core 104, the combined force on the control valve core 104 is to the left, causing the control valve core 104 to accelerate to the left limit position. When it is about to reach the left limit position, the control valve core 104 and the first sleeve 103 form a buffer chamber, and the control valve core 104 stops at the left limit position after buffering and deceleration. At the same time, due to the difference in the design of the left and right step surfaces, the impact piston 108 is subjected to a combined force to the left at this time, and the impact piston 108 returns to the left.

[0052] like Figure 2 , which is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in the second state. Figure 2 The cross section shows the second control flow channel 3 of the valve body 106. The control valve core 104 moves to the left limit position, and the impact piston 108 continues to return to the left. When the impact piston 108 moves to the left until the second annular gap 13 between the impact piston 108 and the second sleeve 109 is connected to the first branch 4 of the second control flow channel 3, the second control flow channel 3 is connected to the high pressure, and the high pressure is connected to the first step surface volume cavity 5 of the control valve core 104 (the left side of the step surface where the first step surface volume cavity 5 is located is smaller than the right side). At this time, the resultant force on the control valve core 104 changes to the right, driving the control valve core 104 to accelerate from the left limit position to the right. The impact piston 108 continues to return to the left.

[0053] like Figure 3 As shown, it is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in the third state. Figure 3 The cross section shows the third control flow channel 6 of the valve body 106. The control valve core 104 moves to the right until the first valve port 2 is just opened. The first valve port 2 is connected to the third control flow channel 6 and turns to high pressure. The high-pressure fluid medium passes to the first chamber 7 on the left side of the impact piston 108 (the first chamber 7 is arranged between the valve body 106 and the slide rod 107). The resultant force on the impact piston 108 changes from left to right. After the impact piston 108 decelerates to the left to zero, it accelerates to the right.

[0054] like Figure 4 As shown, it is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in the fourth state. Figure 4 The cross section shows the fourth control flow channel 8 of the valve body 106. The control valve core 104 moves rightward to the right limit position, and the impact piston 108 strokes rightward. When the impact piston 108 moves rightward to the second branch 9 position at the right end of the fourth control flow channel 8, the first volume 7 on the left side of the impact piston 108 communicates with the fourth control flow channel 8 through the second branch 9. The high pressure of the fourth control flow channel 8 is passed to the second step surface volume 10 of the control valve core 104 (the left side of the step surface where the second step surface volume 10 is located is larger than the right side), thereby changing the combined force of the control valve core 104 to the left, driving the control valve core 104 to move leftward next. The impact piston 108 continues to stroke rightward.

[0055] At this point, the first to fourth control channels of the valve body 106 are all in a high pressure state. Among them, the first control channel 1, the second control channel 3, the third control channel 6, and the fourth control channel 8 are circumferentially distributed in the valve body structure. A cross section is made at the position where the first cavity 7 on the left side of the impact piston 108 is connected to the third control channel 6, as shown in FIG. Figure 5As shown, the distribution positions of the first to fourth control flow channels in the valve body 106 are obtained. The number of the first control flow channels 1, the number of the second control flow channels 3, the number of the third control flow channels 6, and the number of the fourth control flow channels 8 are all set to at least two, and at least two first control flow channels 1 are evenly distributed along the circumference of the valve body 106, at least two second control flow channels 3 are evenly distributed along the circumference of the valve body 106, at least two third control flow channels 6 are evenly distributed along the circumference of the valve body 106, and at least two fourth control flow channels 8 are evenly distributed along the circumference of the valve body 106. Preferably, the number of first control channels 1 is 4, and they are evenly distributed along the circumference of the valve body 106 at 90° intervals; the number of second control channels 3 is 2, and they are evenly distributed along the circumference of the valve body 106 at 180° intervals; the number of third control channels 6 is 8, and they are evenly distributed along the circumference of the valve body 106 at 45° intervals to ensure rapid pressure relief; the number of fourth control channels 8 is 2, and they are evenly distributed along the circumference of the valve body 106 at 180° intervals.

[0056] like Figure 6 , which is a cross-sectional schematic diagram of the flow distribution impact device in the embodiment of the present application when it is in pressure relief. Figure 6 The cross section shows the third control channel 6 of the valve body 106, and the impact piston 108 strokes to the right to the right limit position to realize the impact / impact function. The control valve core 104 moves to the left to the second valve port 11 and connects with the pressure relief hole 15 (waist-shaped hole) of the control valve core 104. The centers of the control valve core 104, the slide rod 107, and the impact piston 108 are all through holes, that is, the control valve core 104, the slide rod 107, and the impact piston 108 are provided with a connected hollow cavity, and the pressure can be relieved through the waist-shaped pressure relief hole 15. At this time, since the right-end branches of the second to fourth control channels are all connected to the first cavity 7 on the left side of the impact piston 108, the first cavity 7 is connected to the waist-shaped pressure relief hole 15 through the second to fourth control channels, so that the second to fourth control channels are all discharged to low pressure, and only the first control channel 1 is high pressure, maintaining a normal high pressure state, that is, returning to the normal high pressure state. Figure 1 State shown: the control valve core 104 is in the middle position, the control valve core 104 and the first valve port 2 of the valve body 106 are closed, at this time only the first control flow channel 1 is in a high-pressure state, and the control valve core 104 accelerates to the left extreme position due to the design difference between the left and right step surfaces, and the impact piston 108 changes from the right extreme impact position to the left return stroke due to the design difference between the left and right step surfaces.

[0057] The impact piston 108 continuously performs periodic reciprocating motion, thereby achieving high-frequency reciprocating impact.

[0058] In summary, the flow distribution impact device configured in this way has the following beneficial effects:

[0059] First, under the drive of high-pressure fluid medium, through the ingenious design of the control valve core 104, the valve body 106 and the impact piston 108 itself, the high-frequency and high-energy impact of the impact piston 108 can be achieved;

[0060] Secondly, the flow distribution impact device integrates multiple control flow channels with functions such as reversing and pressure relief in the valve body 106, and the design is ingenious, which can realize the precise control of the reciprocating impact of the impactor;

[0061] Thirdly, compared with the traditional flow distribution method using at least two transmission media (a combination of gas and liquid transmission media), the flow distribution impact device provided in the embodiment of the present application is driven by a single fluid transmission medium, such as a gas transmission medium or a liquid transmission medium. Since no other power source is required, there is no need to set up an energy storage container and an air chamber to drive and control the movement of the impact piston 108. The structure is simple and easy to use, install and maintain. At the same time, the production cost can be reduced to a certain extent.

[0062] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0063] The flow distribution impact device provided by the present application is introduced in detail above. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the scheme of the present application and its core idea. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A flow distribution impact device, characterized in that: It comprises a housing (101), a first limiting structure, a control valve core (104), a valve body structure, an impact piston (108), and a second limiting structure; The first limiting structure, the valve body structure, and the second limiting structure are sequentially positioned and assembled in the housing (101); The control valve core (104) is movably disposed in a first cavity formed by the first limiting structure and the valve body structure, and the impact piston (108) is movably disposed in a second cavity formed by the valve body structure and the second limiting structure; The valve body structure is provided with a first control flow channel (1), a second control flow channel (3), a third control flow channel (6) and a fourth control flow channel (8) distributed along its circumference; A first annular gap (12) between the housing (101) and the valve body structure, and a second annular gap (13) between the impact piston (108) and the second limiting structure are in communication through the first control flow channel (1); When the first valve port (2) formed by the control valve core (104) and the valve body structure is closed, the control valve core (104) moves to the left, and the impact piston (108) moves to the left; When the impact piston (108) moves leftward until the second annular gap (13) is connected to the second control flow channel (3), the transmission medium flows through the second control flow channel (3) to the first step surface cavity (5) of the control valve core (104), so that the control valve core (104) moves rightward; When the control valve core (104) moves rightward until the first valve port (2) is opened, the transmission medium flows through the third control flow channel (6) to the first volume chamber (7) on the left side of the impact piston (108), so that the impact piston (108) moves rightward; When the impact piston (108) moves rightward until the first volume chamber (7) is connected to the fourth control flow channel (8), the transmission medium flows to the second step surface volume chamber (10) of the control valve core (104), so that the control valve core (104) moves leftward; When the control valve core (104) moves leftward until the second valve port (11) formed by the control valve core (104) and the valve body structure is connected to the pressure relief hole (15) of the control valve core (104), the transmission medium in the second control flow channel (3), the third control flow channel (6) and the fourth control flow channel (8) flows into the control valve core (104) through the second valve port (11) and the pressure relief hole (15) to achieve pressure relief.

2. The flow distribution impact device according to claim 1, characterized in that: The valve body structure comprises a valve body (106) and a sliding rod (107), the sliding rod (107) and the valve body (106) are interference fit, and the first cavity (7) is arranged between the valve body (106) and the sliding rod (107).

3. The flow distribution impact device according to claim 2, characterized in that: The number of the first control flow channels (1), the number of the second control flow channels (3), the number of the third control flow channels (6), and the number of the fourth control flow channels (8) are all set to at least two, and at least two of the first control flow channels (1) are evenly distributed along the circumference of the valve body (106), at least two of the second control flow channels (3) are evenly distributed along the circumference of the valve body (106), at least two of the third control flow channels (6) are evenly distributed along the circumference of the valve body (106), and at least two of the fourth control flow channels (8) are evenly distributed along the circumference of the valve body (106).

4. The flow distribution impact device according to claim 2, characterized in that: The control valve core (104), the sliding rod (107) and the impact piston (108) are provided with a communicating hollow cavity.

5. The flow distribution impact device according to claim 1, characterized in that: The first limiting structure comprises an end cover (102) and a first sleeve (103), wherein the first sleeve (103) is fixed to a side of the end cover (102) close to the control valve core (104), and the first sleeve (103) and the control valve core (104) form a buffer cavity so that the control valve core (104) can be buffered and decelerated and stopped at a left limit position.

6. The flow distribution impact device according to claim 5, characterized in that: It also includes a filter, which is fixed to a side of the end cover (102) away from the first sleeve (103) to limit the position of the end cover (102).

7. The flow distribution impact device according to claim 1, characterized in that: The second limiting structure comprises a second sleeve (109) and a piston sleeve (110), and the piston sleeve (110) is fixed to a side of the second sleeve (109) facing away from the control valve core (104).

8. The flow distribution impact device according to claim 7, characterized in that: A sealing element (105) is provided between the impact piston (108) and the piston bushing (110), and between the valve body structure and the housing (101).

9. The flow distribution impact device according to any one of claims 1 to 8, characterized in that: The control valve core (104) is provided with a recessed structure, the recessed structure is located between the first step surface cavity (5) and the second step surface cavity (10), and the radial dimension of the outer wall of the recessed structure on a side close to the first step surface cavity (5) is greater than the radial dimension of the outer wall of the recessed structure on a side close to the second step surface cavity (10).

10. The flow distribution impact device according to any one of claims 1 to 8, characterized in that: The impact piston (108) comprises a first piston segment, a second piston segment, a third piston segment and a fourth piston segment, wherein the first piston segment, the second piston segment, the third piston segment and the fourth piston segment are arranged in sequence in a direction away from the control valve core (104); The radial dimension of the third piston segment is larger than that of the first piston segment, the radial dimension of the first piston segment is larger than that of the second piston segment, and the radial dimension of the second piston segment is larger than that of the fourth piston segment.

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