Pneumatic tool capable of rotating forwards and backwards

Abstract

According to the technical scheme, the pneumatic tool capable of rotating forwards and backwards is provided. The accommodating chamber of the body is respectively communicated with the switching chamber through a plurality of first steering holes and a plurality of second steering holes, and the switching chamber is respectively communicated with the air inlet channel and the exhaust channel; the air cylinder is contained in the containing chamber, a cylinder chamber is defined by the air cylinder, a plurality of first through holes and a plurality of second through holes are formed in the air cylinder in a penetrating mode, and the first through holes and the second through holes are communicated with the first steering holes and the second steering holes respectively. The rotor is rotatably accommodated in the cylinder chamber; the air inlet flow guide channel and the exhaust flow guide channel of the switching valve piece are not communicated with each other, the size of the air inlet flow guide channel is different from that of the exhaust flow guide channel, the air inlet flow guide channel is communicated with the air inlet channel, and the exhaust flow guide channel is communicated with the exhaust channel. When the switching valve is located at the forward rotation position, the air inlet flow guide channel is communicated with at least one first through hole, the exhaust flow guide channel is communicated with at least one second through hole, the sum of the sectional areas of the at least one first through hole communicated with the air inlet flow guide channel is different from the sum of the sectional areas of the at least one second through hole communicated with the exhaust flow guide channel, and then an unequal air inlet and exhaust system is formed.

Description

Technical Field

[0001] The invention relates to a hand tool, in particular to a pneumatic tool capable of forward and reverse rotation. Background Art

[0002] The power source of pneumatic tools is compressed gas, which is environmentally friendly, safe, and has stable output characteristics. Therefore, it is widely loved and trusted by many workers. Among them, pneumatic tools can be divided into two different structures: one-way rotation or two-way rotation according to usage requirements. The component structure of common pneumatic tools basically includes a body, a cylinder, an air guide structure, and a rotor. The body is equipped with an intake flow channel, an exhaust flow channel, and a chamber. The cylinder is set in the chamber, and the rotor is rotatably accommodated in the cylinder. The rotor is driven to rotate through different air guide structures, thereby producing different power output performances.

[0003] However, the pneumatic tools currently on the market still have defects in the design of the air guide structure, which causes the rotor to rotate faster or slower, resulting in poor stability of power output. Therefore, it is necessary to provide a novel and progressive pneumatic tool that can be reversed to solve the above problems. Summary of the invention

[0004] The main purpose of the present invention is to provide a pneumatic tool that can rotate forward and reverse, which can quickly and smoothly discharge the gas in the cylinder, effectively reduce the gas resistance when the rotor rotates, and ensure high-efficiency conversion and stable power output.

[0005] To achieve the above-mentioned object, the present invention provides a pneumatic tool capable of forward and reverse rotation, comprising: a body, a cylinder, a rotor and a switching valve. The main body includes a accommodating chamber, a switching chamber, a plurality of first turning holes, a plurality of second turning holes, an intake passage and an exhaust passage, the accommodating chamber is connected to the switching chamber via the plurality of first turning holes and the plurality of second turning holes, respectively, and the switching chamber is connected to the intake passage and the exhaust passage respectively; the cylinder is accommodated in the accommodating chamber, the cylinder is surrounded by a cylinder chamber, the cylinder includes a first side portion and a second side portion, a plurality of first through holes are penetrated in the first side portion, the plurality of first through holes are respectively connected to the plurality of first turning holes, and a plurality of second through holes are penetrated in the second side portion, the plurality of second through holes are respectively connected to the plurality of second turning holes; the rotor is rotatably accommodated in the cylinder chamber; a switching valve member is inserted in the switching chamber and can be rotated to a forward position and a reverse position, the switching valve member includes an intake guide channel and an exhaust guide channel, the intake guide channel and the exhaust guide channel are not The two valves are interconnected, and the size of the intake guide channel is different from that of the exhaust guide channel. The intake guide channel is connected to the intake channel, and the exhaust guide channel is connected to the exhaust channel; wherein, when the switching valve member is located at the forward rotation position, the intake guide channel is connected to at least one of the first through holes, and the exhaust guide channel is connected to at least one of the second through holes. The total cross-sectional area of ​​the at least one first through hole connected to the intake guide channel is different from the total cross-sectional area of ​​the at least one second through hole connected to the exhaust guide channel, thereby forming an unequal intake and exhaust system; wherein, when the switching valve member is located at the reverse position, the intake guide channel is connected to at least one of the second through holes, and the exhaust guide channel is connected to at least one of the first through holes. The total cross-sectional area of ​​the at least one second through hole connected to the intake guide channel is different from the total cross-sectional area of ​​the at least one first through hole connected to the exhaust guide channel, thereby forming an unequal intake and exhaust system.

[0006] As a preferred embodiment of the above technical solution, preferably, the cylinder is further provided with a plurality of pressure relief holes arranged at intervals, and the plurality of pressure relief holes are connected to the cylinder chamber to allow part of the gas pushed during the rotation of the rotor to flow out; wherein the sum of the cross-sectional areas of the plurality of pressure relief holes is smaller than the sum of the cross-sectional areas of the plurality of first through holes or the sum of the cross-sectional areas of the plurality of second through holes.

[0007] As a preferred embodiment of the above technical solution, preferably, the cylinder further includes an annular groove, which is recessed in the outer peripheral wall of the cylinder, and the annular groove and the inner wall of the chamber jointly define a pressure relief channel, which connects the multiple pressure relief holes and the exhaust channel.

[0008] As a preferred embodiment of the above technical solution, preferably, the plurality of second turning holes are symmetrically arranged with the plurality of first turning holes, and the plurality of second through holes are symmetrically arranged with the plurality of first through holes, and the opening contours of the plurality of first turning holes are projected onto the first side to form a first area and a second area, and the plurality of first through holes are respectively arranged in the first area and the second area, and the state of the first through holes located in the first area is different from the state of the first through holes located in the second area.

[0009] As a preferred embodiment of the above technical solution, preferably, the total opening area of ​​the first through holes located in the second zone is greater than the total opening area of ​​the first through holes located in the first zone.

[0010] As a preferred embodiment of the above technical solution, preferably, the number of the first through holes located in the first zone is plural and they are arranged at intervals along the circumference of the cylinder.

[0011] As a preferred embodiment of the above technical solution, preferably, the number of the first through holes located in the second zone is plural and they are arranged at intervals along the axial direction of the cylinder.

[0012] As a preferred embodiment of the above technical solution, preferably, the cylinder further comprises a weight-reducing hole, and the weight-reducing hole is recessed in the outer wall of the cylinder.

[0013] As a preferred embodiment of the above technical solution, preferably, the switching valve component further includes a columnar body and an operating portion, the body protruding from the operating portion for inserting into the switching chamber, the intake flow guide and the exhaust flow guide are respectively radially recessed in the outer peripheral wall of the body and located on two opposite sides of the body; wherein, the intake flow guide extends along the circumferential direction of the body and does not penetrate the body in the axial direction of the body, and the exhaust flow guide extends along the axial direction of the body and penetrates the body; wherein, the plurality of first turning holes are arranged at intervals along an extension direction parallel to the axial direction of the body, the plurality of second turning holes are arranged at intervals along an extension direction parallel to the axial direction of the body, and the length of the exhaust flow guide in the axial direction of the body is greater than the length of the intake flow guide in the axial direction of the body.

[0014] As a preferred embodiment of the above technical solution, preferably, the cylinder is further provided with a plurality of pressure relief holes arranged at intervals, and the plurality of pressure relief holes are connected to the cylinder chamber to allow part of the gas pushed during the rotation of the rotor to flow out; wherein the sum of the cross-sectional areas of the plurality of pressure relief holes is smaller than the sum of the cross-sectional areas of the plurality of first through holes or the sum of the cross-sectional areas of the plurality of second through holes; the cylinder further includes an annular groove, which is recessed in the outer peripheral wall of the cylinder, and the annular groove and the inner wall of the chamber jointly define a pressure relief channel, which connects the plurality of pressure relief holes and the exhaust channel; the number of the first through holes located in the first zone is a plurality and is spaced apart along the circumference of the cylinder; the number of the first through holes located in the second zone is a plurality and is spaced apart along the axial direction of the cylinder; the cylinder further includes a weight reduction hole, which is recessed in the outer wall of the cylinder; the switching valve member further includes a columnar body and an operating portion, the body protruding from the operating portion for inserting into the switching chamber, the intake flow guide and the exhaust flow guide are respectively radially recessed in the outer peripheral wall of the body and located at two opposite sides of the body; wherein the intake flow guide extends along the circumference of the body and does not penetrate the body in the axial direction of the body, and the exhaust flow guide extends along the axial direction of the body and penetrates the body; wherein the plurality of first turning holes are arranged at intervals along the extension direction parallel to the axial direction of the body, the plurality of second turning holes are arranged at intervals along the extension direction parallel to the axial direction of the body, the length of the exhaust flow guide in the axial direction of the body is greater than the length of the intake flow guide in the axial direction of the body; each of the pressure relief holes is a circular hole; the area of ​​the second zone is greater than that of the first zone; each of the first through holes in the first zone is a circular hole, and each of the first through holes in the second zone is a long strip hole; the cylinder chamber is eccentrically arranged on the cylinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0016] Figure 1 It is a three-dimensional diagram of an embodiment of the present invention.

[0017] Figure 2 It is a three-dimensional diagram from another viewing angle of an embodiment of the present invention.

[0018] Figure 3 FIG. 1 is an exploded view of an embodiment of the present invention.

[0019] Figure 4 for Figure 1 Front cross-sectional view of .

[0020] Figure 5 for Figure 1 A sectional perspective view of .

[0021] Figure 6 for Figure 1 A bottom sectional view of .

[0022] Figure 7 This is a three-dimensional diagram of a cylinder according to an embodiment of the present invention.

[0023] Figure 8 for Figure 7 Front view of .

[0024] Fig. 9 for Figure 7 Bottom view of .

[0025] Among them, 1: main body; 11: container chamber; 12: switching chamber; 13: first turning hole; 14: second turning hole; 15: intake channel; 16: exhaust channel; 2: cylinder; 21: cylinder chamber; 221: first side; 222: second side; 231: first area; 232: second area; 241: first through hole; 242: second through hole 25: annular groove; 26: pressure relief hole; 27: weight reduction hole; 3: rotor; 4: switching valve member; 41: intake guide channel; 42: exhaust guide channel; 43: body; 44: operating part; 5: pressure relief channel. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] Please refer to Figures 1 to 9 , which shows an embodiment of the present invention. The reversible pneumatic tool of the present invention comprises: a main body 1, a cylinder 2, a rotor 3 and a switching valve member 4.

[0028] The main body 1 includes a accommodating chamber 11, a switching chamber 12, a plurality of first turning holes 13, a plurality of second turning holes 14, an intake passage 15 and an exhaust passage 16. The accommodating chamber 11 is connected to the switching chamber 12 via the plurality of first turning holes 13 and the plurality of second turning holes 14, respectively, and the switching chamber 12 is further connected to the intake passage 15 and the exhaust passage 16, respectively.

[0029] The cylinder 2 is accommodated in the accommodation chamber 11, and the cylinder 2 is surrounded by a cylinder chamber 21. The cylinder chamber 21 is eccentrically arranged on the cylinder 2, and the rotor 3 is rotatably accommodated in the cylinder chamber 21; wherein, the cylinder 2 includes a first side portion 221 and a second side portion 222, and a plurality of first through holes 241 are penetrated in the first side portion 221, and the plurality of first through holes 241 are respectively connected to the plurality of first turning holes 13, and a plurality of second through holes 242 are penetrated in the second side portion 222, and the plurality of second through holes 242 are respectively connected to the plurality of second turning holes 14.

[0030] The switching valve member 4 is inserted into the switching chamber 12 and can rotate to a forward position and a reverse position. The switching valve member 4 includes an intake guide channel 41 and an exhaust guide channel 42. The intake guide channel 41 and the exhaust guide channel 42 are not connected to each other, and the size of the intake guide channel 41 is different from the size of the exhaust guide channel 42. The intake guide channel 41 is connected to the intake channel 15, and the exhaust guide channel 42 is connected to the exhaust channel 16.

[0031] Wherein, when the switching valve member 4 is located at the forward rotation position, the intake flow channel 41 is connected to at least one of the first through holes 241, the exhaust flow channel 42 is connected to at least one of the second through holes 242, and the total cross-sectional area of ​​the at least one of the first through holes 241 connected to the intake flow channel 41 is different from the total cross-sectional area of ​​the at least one of the second through holes 242 connected to the exhaust flow channel 42, thereby forming an unequal intake and exhaust system. Similarly, when the switching valve member 4 is located at the reverse position, the intake flow channel 41 is connected to at least one of the second through holes 242, the exhaust flow channel 42 is connected to at least one of the first through holes 241, and the total cross-sectional area of ​​the at least one of the second through holes 242 connected to the intake flow channel 41 is different from the total cross-sectional area of ​​the at least one of the first through holes 241 connected to the exhaust flow channel 42, thereby forming an unequal intake and exhaust system.

[0032] To be more specific, the switching valve member 4 further includes a columnar body 43 and an operating portion 44, wherein the body 43 protrudes from the operating portion 44 for being inserted into the switching chamber 12, and the intake guide 41 and the exhaust guide 42 are respectively radially recessed in the outer peripheral wall of the body 43 and located at two opposite sides of the body 43; wherein the intake guide 41 extends along the circumferential direction of the body 43 and does not penetrate the body 43 in the axial direction of the body 43, and the exhaust guide 42 extends along the axial direction of the body 43 and penetrates the body 43; wherein the plurality of first turning holes 13 are arranged at intervals along an extension direction parallel to the axial direction of the body 43, and the plurality of second turning holes 14 are arranged at intervals along an extension direction parallel to the axial direction of the body 43, and the length of the exhaust guide 42 in the axial direction of the body 43 is greater than the length of the intake guide 41 in the axial direction of the body 43.

[0033] To be more specific, if the number of the plurality of first turning holes 13 and the plurality of second turning holes 14 are configured in the same manner and the number of the plurality of first through holes 241 and the plurality of second through holes 242 are configured in the same manner, when the switching valve member 4 is located in the forward rotation position, the number of the plurality of second turning holes 14 connected to the exhaust flow channel 42 will be greater than the number of the plurality of first turning holes 13 connected to the intake flow channel 41, and the sum of the cross-sectional areas of the plurality of second through holes 242 connected to the exhaust channel 16 will be greater than the cross-sectional area of ​​the plurality of first through holes 241 connected to the intake channel 15, thereby forming an unequal intake and exhaust system in which the allowable exhaust volume is greater than the allowable intake volume. In this way, it is ensured that the gas in the cylinder 2 can flow out smoothly and quickly without accumulation, so as to reduce the gas resistance during the rotation of the rotor 3, and maintain the smoothness and stability of the rotation of the rotor 3, ensuring that the rotation of the rotor 3 will not be fast or slow, so as to achieve the purpose of the pneumatic tool having high-efficiency kinetic energy conversion and stable power output. Similarly, when the switching valve 4 is in the reverse position, it also has the same effect.

[0034] In this embodiment, the plurality of second turning holes 14 are symmetrically arranged with the plurality of first turning holes 13, the plurality of second through holes 242 are symmetrically arranged with the plurality of first through holes 241, and the opening contours of the plurality of first turning holes 13 are projected onto the first side portion 221 to form a first area 231 and a second area 232. The plurality of first through holes 241 are respectively arranged in the first area 231 and the second area 232. The state of the first through holes 241 located in the first area 231 is different from the state of the first through holes 241 located in the second area 232 so as to distinguish the functions in different states.

[0035] Further, taking the switching valve member 4 at the forward rotation position as an example, the first through hole 241 located in the first area 231 is an intake function, and the first through hole 241 located in the second area 232 is blocked by the switching valve member 4 and is not connected; and when the switching valve member 4 is at the reverse position, the first through holes 241 located in the first area 231 and the second area 232 are both exhaust functions. Further, the area of ​​the second area 232 is larger than that of the first area 231, and the total opening area of ​​the first through holes 241 located in the second area 232 is larger than the total opening area of ​​the first through holes 241 located in the first area 231, so as to further expand the difference between the exhaust volume and the intake volume, and to ensure the exhaust smoothness.

[0036] In this embodiment, the number of the first through holes 241 located in the first zone 231 is plural and arranged at intervals along the circumference of the cylinder 2, and the number of the first through holes 241 located in the second zone 232 is plural and arranged at intervals along the axial direction of the cylinder 2. Each of the first through holes 241 in the first zone 231 is a circular hole, and each of the first through holes 241 in the second zone 232 is a long strip hole.

[0037] Preferably, the cylinder 2 is further provided with a plurality of pressure relief holes 26 arranged at intervals, each of which is a circular hole. The plurality of pressure relief holes 26 are connected to the cylinder chamber 21 to allow part of the gas pushed during the rotation of the rotor 3 to flow out, and the function is to reduce the resistance of the rotor 3 in the initial rotation; wherein the sum of the cross-sectional areas of the plurality of pressure relief holes 26 is smaller than the sum of the cross-sectional areas of the plurality of first through holes 241 or the sum of the cross-sectional areas of the plurality of second through holes 242. It is worth mentioning that the plurality of pressure relief holes 26 are only for initial exhaust pressure reduction (small exhaust volume), while the plurality of first through holes 241 in the exhaust state or the plurality of second through holes 242 in the exhaust state are used to reduce the resistance of the rotor 3 in the middle and late stages of rotation (large exhaust volume), and the two obviously have different action timings.

[0038] In this embodiment, the cylinder 2 further includes an annular groove 25, which is recessed in the outer peripheral wall of the cylinder 2. The annular groove 25 and the inner wall of the chamber 11 together define a pressure relief channel 5, and the pressure relief channel 5 communicates with the plurality of pressure relief holes 26 and the exhaust channel 16 to guide the gas out. In addition, the cylinder 2 further includes a weight reduction hole 27, which is recessed in the outer wall of the cylinder 2, so that the cylinder 2 can be lightweight.

[0039] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A pneumatic tool capable of forward and reverse rotation, characterized in that: include: A body, comprising a containing chamber, a switching chamber, a plurality of first turning holes, a plurality of second turning holes, an air inlet passage and an air exhaust passage, wherein the containing chamber is connected to the switching chamber via the plurality of first turning holes and the plurality of second turning holes respectively, and the switching chamber is connected to the air inlet passage and the air exhaust passage respectively; A cylinder is accommodated in the accommodation chamber, and is surrounded by a cylinder chamber, including a first side portion and a second side portion, wherein a plurality of first through holes are penetrated in the first side portion, and the plurality of first through holes are respectively connected to the plurality of first turning holes, and a plurality of second through holes are penetrated in the second side portion, and the plurality of second through holes are respectively connected to the plurality of second turning holes; a rotor rotatably accommodated in the cylinder chamber; and a switching valve member, inserted into the switching chamber and rotatable to a forward position and a reverse position, the switching valve member comprising an intake guide passage and an exhaust guide passage, the intake guide passage and the exhaust guide passage are not connected to each other, and the size of the intake guide passage is different from that of the exhaust guide passage, the intake guide passage is connected to the intake channel, and the exhaust guide passage is connected to the exhaust channel; Wherein, when the switching valve member is located at the forward rotation position, the intake flow guide is connected to at least one of the first through holes, the exhaust flow guide is connected to at least one of the second through holes, and the total cross-sectional area of ​​the at least one first through hole connected to the intake flow guide is different from the total cross-sectional area of ​​the at least one second through hole connected to the exhaust flow guide, thereby forming an unequal intake and exhaust system; When the switching valve is located at the reverse position, the intake guide is connected to at least one of the second through holes, and the exhaust guide is connected to at least one of the first through holes. The total cross-sectional area of ​​the at least one second through hole connected to the intake guide is different from the total cross-sectional area of ​​the at least one first through hole connected to the exhaust guide, thereby forming an unequal intake and exhaust system.

2. The reversible pneumatic tool according to claim 1, characterized in that: The cylinder is further provided with a plurality of pressure relief holes arranged at intervals, and the plurality of pressure relief holes are connected to the cylinder chamber to allow part of the gas pushed during the rotation of the rotor to flow out; wherein the sum of the cross-sectional areas of the plurality of pressure relief holes is smaller than the sum of the cross-sectional areas of the plurality of first through holes or the sum of the cross-sectional areas of the plurality of second through holes.

3. The reversible pneumatic tool according to claim 2, characterized in that: The cylinder further comprises an annular groove, which is recessed in the outer peripheral wall of the cylinder. The annular groove and the inner wall of the chamber jointly define a pressure relief channel, and the pressure relief channel communicates with the plurality of pressure relief holes and the exhaust channel.

4. The reversible pneumatic tool according to claim 1, characterized in that: The plurality of second turning holes are symmetrically arranged with the plurality of first turning holes, and the plurality of second through holes are symmetrically arranged with the plurality of first through holes. The opening contours of the plurality of first turning holes are projected onto the first side portion to form a first area and a second area. The plurality of first through holes are respectively arranged in the first area and the second area, and the state of the first through holes located in the first area is different from the state of the first through holes located in the second area.

5. The reversible pneumatic tool according to claim 4, characterized in that: The total opening area of ​​the first through holes located in the second zone is greater than the total opening area of ​​the first through holes located in the first zone.

6. The reversible pneumatic tool according to claim 4, characterized in that: The number of the first through holes located in the first zone is plural and the first through holes are arranged at intervals along the circumferential direction of the cylinder.

7. The reversible pneumatic tool according to claim 4, characterized in that: The number of the first through holes located in the second zone is plural and they are arranged at intervals along the axial direction of the cylinder.

8. The reversible pneumatic tool according to claim 1, characterized in that: The cylinder further comprises a weight-reducing hole, which is concavely arranged on the outer wall of the cylinder.

9. The reversible pneumatic tool according to any one of claims 1 to 7, characterized in that: The switching valve component further includes a columnar body and an operating portion, the body protruding from the operating portion for inserting into the switching chamber, the intake flow guide and the exhaust flow guide are respectively radially recessed in the outer peripheral wall of the body and located at two opposite sides of the body; wherein the intake flow guide extends along the circumference of the body and does not penetrate the body in the axial direction of the body, and the exhaust flow guide extends along the axial direction of the body and penetrates the body; wherein the plurality of first turning holes are arranged at intervals along an extension direction parallel to the axial direction of the body, and the plurality of second turning holes are arranged at intervals along an extension direction parallel to the axial direction of the body, and the length of the exhaust flow guide in the axial direction of the body is greater than the length of the intake flow guide in the axial direction of the body.

10. The reversible pneumatic tool according to claim 5, characterized in that: The cylinder is also provided with a plurality of pressure relief holes arranged at intervals, and the plurality of pressure relief holes are connected to the cylinder chamber to allow part of the gas pushed during the rotation of the rotor to flow out; wherein the sum of the cross-sectional areas of the plurality of pressure relief holes is smaller than the sum of the cross-sectional areas of the plurality of first through holes or the sum of the cross-sectional areas of the plurality of second through holes; the cylinder also includes an annular groove, which is recessed in the outer peripheral wall of the cylinder, and the annular groove and the inner wall of the chamber jointly define a pressure relief channel, which connects the plurality of pressure relief holes and the exhaust channel; the number of the first through holes located in the first zone is a plurality and is arranged at intervals along the circumference of the cylinder; the number of the first through holes located in the second zone is a plurality and is arranged at intervals along the axial direction of the cylinder; the cylinder also includes a weight reduction hole, which is recessed in the outer wall of the cylinder; the switching valve component also includes a columnar body and an operating portion, the The body protrudes from the operating part to be inserted into the switching chamber, and the intake guide channel and the exhaust guide channel are respectively radially recessed in the outer peripheral wall of the body and are located on two opposite sides of the body; wherein, the intake guide channel extends along the circumference of the body and does not penetrate the body in the axial direction of the body, and the exhaust guide channel extends along the axial direction of the body and penetrates the body; wherein, the plurality of first turning holes are arranged at intervals along the extension direction parallel to the axial direction of the body, and the plurality of second turning holes are arranged at intervals along the extension direction parallel to the axial direction of the body, and the length of the exhaust guide channel in the axial direction of the body is greater than the length of the intake guide channel in the axial direction of the body; each of the pressure relief holes is a circular hole; the area of ​​the second zone is greater than that of the first zone; each of the first through holes in the first zone is a circular hole, and each of the first through holes in the second zone is a long strip hole; and the cylinder chamber is eccentrically arranged on the cylinder.

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