Chain saw pressure relief valve

Abstract

The utility model relates to an oil saw pressure reducing valve, including valve body, valve cover and valve core, the valve body is opened with the through hole, the through hole includes the sealing channel, pressure relief channel and pressure reducing channel who set gradually along its axial direction, the diameter of sealing channel is a1, the diameter of pressure relief channel is a2, the diameter of pressure reducing channel is a3, a3>a2>a1, the pressure reducing channel is located the one end that valve body links with oil saw cylinder, the port department of pressure reducing channel is equipped with the sealing mouth who flares outward, the valve core is inserted in the through hole, and its one end is equipped with the sealing head who is matched with sealing mouth, sealing mouth and sealing head outer wall matched sealing, the other end of valve core sets up in the valve body outside and is connected with operating part, operating part drives the valve core and can axial reciprocating displacement relative to the through hole, operating part includes first connecting part, extension and operating part, the one end of extension is big end relative to first connecting part, the one end of extension is small end relative to operating part, the section of operating part is T type setting.

Description

Technical Field

[0001] This utility model belongs to the field of pressure reducing valve technology, and in particular relates to a chainsaw pressure reducing valve. Background Technology

[0002] A chainsaw, also known as a chainsaw, is a hand-held saw powered by a gasoline engine. It is mainly used for logging and timber processing. Its working principle is to drive the blades distributed on the left and right of the saw chain to reciprocate and cut trees. Small-displacement chainsaws are generally started manually at room temperature, requiring several pulls to start.

[0003] During the start-up or use of a chainsaw, engine overheating can cause the chainsaw to become extremely hot to the touch, resulting in insufficient power or even abnormal stalling. This can lead to overheating of the pressure relief valve. Given the overheated pressure relief valve and the high pressure applied to the chainsaw end, how to safely and quickly use the pressure relief valve to reduce pressure and exhaust gas becomes an urgent problem to be solved. Summary of the Invention

[0004] In summary, to overcome the shortcomings of the prior art, this utility model provides a chainsaw pressure reducing valve.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a chainsaw pressure reducing valve, comprising a valve body, a valve cover, and a valve core. The valve body has a through hole extending through both ends. The through hole includes a sealing channel, a pressure relief channel, and a pressure reducing channel arranged sequentially along its axial direction. The diameter of the sealing channel is a1, the diameter of the pressure relief channel is a2, and the diameter of the pressure reducing channel is a3. a3>a2>a1, the pressure reducing channel is located at the end of the valve body connected to the chainsaw cylinder, the port of the pressure reducing channel is provided with an outwardly flared sealing port, the valve core is inserted into the through hole, one end of which is provided with a sealing head adapted to the sealing port, the sealing port and the outer wall of the sealing head are adapted to seal, the other end of the valve core is located outside the valve body and connected to the operating component, the operating component drives the valve core to move axially back and forth relative to the through hole, the operating component includes a first connecting part, an extension part and an operating part connected to the valve core, the end of the extension part relative to the first connecting part is the large end, the end of the extension part relative to the operating part is the small end, the cross section of the operating part is T-shaped.

[0006] By adopting the above technical solution, the combustion chamber of the cylinder is connected to the valve body. When the chainsaw needs to be started, the valve core is pressed down, causing the sealing head to separate from the sealing port, and the combustion chamber of the cylinder is connected to the pressure relief channel. When the chainsaw starts, as the chainsaw speed increases, the cylinder pressure in the combustion chamber will also increase. When the cylinder pressure overcomes the resistance of the limiting component, it will push the sealing head to fit and seal with the sealing port, automatically reset, and then close the valve to prevent air pressure leakage. Compared with the existing pressure relief valve, the operating part of this utility model is connected to the valve core through the first connecting part, and a T-shaped operating part is set, which is convenient for applying force, conforms to ergonomics, and saves more effort. Then, the lever arm of the valve core is lengthened by the extension part, which not only saves more effort but also... The design incorporates a pressure-reducing channel that allows for rapid separation of the sealing head and sealing port, enhancing safety. The extension section keeps the operating part away from the valve body, improving heat dissipation and preventing burns from hand contact with the valve body, further enhancing safety. The pressure-reducing channel allows for rapid pressure release, reducing cylinder pressure and improving the ease of starting the chainsaw. The extension section has a larger end relative to the first connecting part and a smaller end relative to the operating part, saving material and maintaining the strength of the connection with the valve core. The smaller end connects to the operating part, and the smaller diameter of the lower end of the operating part facilitates two-finger gripping and pressing down with the palm. Compared to existing pressure-reducing valves with larger valve caps requiring three-finger gripping and wrist pressing, this design is more effortless and convenient.

[0007] This utility model further includes: a limiting hole connected to the sealing channel is provided on the outer wall of the valve body corresponding to the sealing channel; a limiting component for positioning the valve core is provided in the limiting hole; a vent hole connected to the pressure relief channel is provided on the outer wall of the valve body; the valve body includes a sealing part, a fixing part, and a second connecting part; the valve cover is sleeved on the sealing part; the end of the valve cover is provided with a shaft hole adapted to the valve core; the limiting hole is located on the outer circumferential wall of the sealing part; the vent hole is located on the outer wall of the fixing part; the outer circumferential wall of the second connecting part is provided with an external thread for threaded connection with the chainsaw cylinder; the outer circumferential wall of the valve core is provided with a first positioning groove; the limiting component includes a ball that cooperates with the first positioning groove and a spring with one end fixed to the ball and the other end abutting against the inner wall of the valve cover.

[0008] By adopting the above technical solution, the air guide hole is connected to the outside of the cylinder, thereby reducing the cylinder pressure, making the chainsaw easier to start, and making starting easier and more convenient. The second connecting part is connected to the cylinder of the chainsaw, so that the fixed part abuts against the cylinder for limiting, thereby facilitating positioning and installation. The threaded connection facilitates disassembly and assembly. When the valve core moves downward, the ball moves towards the spring, so that the spring is in a compressed state, and the ball moves out from the first positioning groove to abut against the outer wall of the valve core. When the valve core moves upward, the ball moves into the first positioning groove by the elastic force of the spring, abutting against the valve core for limiting, thereby improving the stability of the valve core.

[0009] The present invention further comprises: a connecting clip with an I-shaped cross-section is provided at one end of the valve core corresponding to the operating component; the operating component is axially divided into a main body and a movable body with the valve core as the axis; a limiting groove adapted to the connecting clip is provided at the position of the main body corresponding to the connecting clip; and a receiving groove is provided at the position of the movable body corresponding to the connecting clip; when the main body and the movable body are closed, the connecting clip is located between the main body and the movable body.

[0010] By adopting the above technical solution, the valve core is first inserted into the sealing port, and the sealing head and valve core are integrally formed, resulting in higher sealing performance and stability. Then, by setting the main body and the movable body separately, the installation of the operating parts and valve core can be completed quickly and easily. Compared with the existing technology, which often uses post-processing (such as welding, gluing, etc.), the process is simple, the assembly efficiency is high, and the cost is low.

[0011] The present invention further comprises: a sliding protrusion in the shape of an inverted trapezoid on one side of the main base corresponding to the movable base; the sliding protrusion being disposed at the other end of the limiting groove opposite to the valve body; a dovetail groove adapted to the sliding protrusion on one side of the movable base corresponding to the main base; the dovetail groove being connected to the receiving groove and the receiving groove being open at one end corresponding to the valve body; the main base being engaged with the valve core; and the movable base being slidably engaged with the main base through the dovetail groove.

[0012] By adopting the above technical solution, the sliding snap-fit ​​method makes assembly simple, convenient, and efficient. The dovetail groove and sliding protrusion ensure that the main body and the moving body are not easily separated, resulting in high stability.

[0013] The present invention further includes: a semi-annular elastic sealing ring provided on the half side of the connecting card corresponding to the movable base, and the receiving groove being adapted to the outer diameter of the valve core.

[0014] By adopting the above technical solution, the elastic sealing ring is set in the "I"-shaped groove of the connecting card part. During the assembly process, the receiving groove and the elastic sealing ring are interference fit, which increases the contact area and increases the friction. The main body and the valve core are strengthened by snap-fit, and the movable body is strengthened by the elastic sealing ring.

[0015] The present invention further includes: semi-annular mounting grooves are respectively provided below the corresponding operating parts of the main body and the movable body, and the two mounting grooves are closed to form an annular groove, with an opening mounting ring provided inside the annular groove.

[0016] By adopting the above technical solution, the main base and the movable base are secured by a retaining ring to prevent them from separating and to enhance the stability of the connection. The retaining ring is used in conjunction with the mounting groove to limit the movement and ensure that the movable base and the main base are assembled in place at the same height, preventing them from sliding or shifting vertically.

[0017] The present invention further includes an elastic heat-insulating sleeve covering the operating part.

[0018] By adopting the above technical solution, the elastic heat insulation sleeve further strengthens the connection between the main body and the movable body, while also playing the role of heat insulation and anti-scalding.

[0019] The specific embodiments of this utility model are described below with reference to the accompanying drawings and examples. Attached Figure Description

[0020] Figure 1 This is a perspective view of Embodiment 1 of the present utility model.

[0021] Figure 2 This is a cross-sectional view of Embodiment 1 of the present utility model.

[0022] Figure 3 This is a cross-sectional view of Embodiment 2 of the present invention.

[0023] Figure 4 This is an exploded view of Embodiment 1 of this utility model.

[0024] Figure 5 This is a perspective view of the main body and the movable body of Embodiment 2 of this utility model.

[0025] Reference numerals: 1. Valve body, 11. Sealing channel, 12. Pressure relief channel, 13. Pressure reducing channel, 14. Sealing port, 15. Limiting hole, 16. Air guide hole, 17. Sealing part, 18. Fixing part, 19. Second connecting part, 2. Valve cover, 3. Valve core, 31. Sealing head, 32. First positioning groove, 33. Connecting clip part, 34. Second positioning groove, 4. Operating component, 41. First connecting part, 42. Extension part, 43. Operating part, 44. Main base, 441. Limiting groove, 442. Sliding protrusion, 45. Movable base, 451. Receiving groove, 452. Dovetail groove, 46. Mounting groove, 5. Limiting component, 51. Ball bearing, 52. Spring, 6. Elastic sealing ring, 7. Mounting retaining ring, 8. Elastic heat insulation sleeve. Detailed Implementation

[0026] This specific embodiment is merely an explanation of the present utility model and is not intended to limit the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present utility model, they are protected by patent law.

[0027] See appendix Figure 1-4This embodiment discloses a chainsaw pressure reducing valve, including a valve body 1, a valve cover 2, and a valve core 3. The valve body 1 has a through hole extending through both ends. The through hole includes a sealing channel 11, a pressure relief channel 12, and a pressure reducing channel 13 arranged sequentially along its axial direction. The diameter of the sealing channel 11 is a, the diameter of the pressure relief channel 12 is a, and the diameter of the pressure reducing channel 13 is a. a>a>a, the pressure reducing channel 13 is located at the end of the valve body 1 connected to the chainsaw cylinder. The port of the pressure reducing channel 13 is provided with an outwardly flared sealing port 14. The valve core 3 is inserted into the through hole. One end of the valve core 3 is provided with a sealing head 31 that is adapted to the sealing port 14. The sealing port 14 and the outer wall of the sealing head 31 are adapted to seal. The other end of the valve core 3 is located outside the valve body 1 and connected to the operating component 4. The operating component 4 drives the valve core 3 to move axially back and forth relative to the through hole. The operating component 4 includes a first connecting part 41, an extension part 42 and an operating part 43 connected to the valve core 3. The end of the extension part 42 relative to the first connecting part 41 is the large end, and the end of the extension part 42 relative to the operating part 43 is the small end. The cross-section of the operating part 43 is T-shaped.

[0028] This embodiment further includes: a limiting hole 15 communicating with the sealing channel 11 is provided on the outer wall of the valve body 1 corresponding to the sealing channel 11; a limiting component 5 for positioning the valve core 3 is provided in the limiting hole 15; a vent hole 16 communicating with the pressure relief channel 12 is provided on the outer wall of the valve body 1; the valve body 1 includes a sealing part 17, a fixing part 18, and a second connecting part 19; the valve cover 2 is sleeved on the sealing part 17; the end of the valve cover 2 is provided with a shaft hole adapted to the valve core 3; and the limiting hole 15 is located in the sealing channel 11. On the outer circumferential wall of the sealing part 17, the air guide hole 16 is located on the outer wall of the fixing part 18. The outer circumferential wall of the second connecting part 19 is provided with an external thread that is threaded to the chainsaw cylinder. The outer circumferential wall of the valve core 3 is provided with a first positioning groove 32. The limiting component 5 includes a ball 51 that cooperates with the first positioning groove 32 and a spring 52 with one end fixed to the ball 51 and the other end abutting against the inner wall of the valve cover 2. The outer circumferential wall of the valve core 3 is provided with a second positioning groove 34, which is located above the first positioning groove 32.

[0029] This embodiment further includes the following configuration: one end of the valve core 3 corresponding to the operating component 4 is provided with a connecting clip 33 with an I-shaped cross section. The operating component 4 is axially divided into a main body 44 and a movable body 45 with the valve core 3 as the axis. The main body 44 is provided with a limiting groove 441 that matches the connecting clip 33 at the position corresponding to the connecting clip 33. The movable body 45 is provided with a receiving groove 451 at the position corresponding to the connecting clip 33. When the main body 44 and the movable body 45 are closed, the connecting clip 33 is located between the main body 44 and the movable body 45.

[0030] This embodiment further includes the following configuration: a sliding protrusion 442 in the shape of an inverted trapezoid is provided on one side of the main base 44 corresponding to the movable base 45. The sliding protrusion 442 is located at the other end of the limiting groove 441 opposite to the valve body 1. A dovetail groove 452 adapted to the sliding protrusion 442 is provided on one side of the movable base 45 corresponding to the main base 44. The dovetail groove 452 is connected to the receiving groove 451, and the receiving groove 451 is open at one end corresponding to the valve body 1. The main base 44 is engaged with the valve core 3, and the movable base 45 is slidably engaged with the main base 44 through the dovetail groove 452.

[0031] In this embodiment, a semi-annular elastic sealing ring 6 is provided on the half side of the connecting card part 33 corresponding to the movable base 45, and the receiving groove 451 is adapted to the outer diameter of the valve core 3.

[0032] In this embodiment, the main base 44 and the movable base 45 are respectively provided with semi-annular mounting grooves 46 below the corresponding operating part 43. When the two mounting grooves 46 are closed, they form an annular groove, and an mounting retaining ring 7 with an opening is provided in the annular groove.

[0033] In this embodiment, the operating part 43 is further provided with an elastic heat insulation sleeve 8.

[0034] In the description of this utility model, it should be noted that the terms "inner," "outer," "upper," and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. The aforementioned "between" does not only refer to the orientation or position, but also includes the interaction between different parts. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0035] Although this document frequently uses terms such as valve body 1, sealing channel 11, pressure relief channel 12, pressure reducing channel 13, sealing port 14, limiting hole 15, air guide hole 16, sealing part 17, fixing part 18, second connecting part 19, valve cover 2, valve core 3, sealing head 31, first positioning groove 32, connecting clip part 33, second positioning groove 34, operating part 4, first connecting part 41, extension part 42, operating part 43, main base 44, limiting clip groove 441, sliding protrusion 442, movable base 45, receiving groove 451, dovetail groove 452, mounting groove 46, limiting component 5, ball 51, spring 52, elastic sealing ring 6, mounting retaining ring 7, elastic heat insulation sleeve 8, etc., the possibility of using other terms is not excluded. The use of these terms is merely for the convenience of describing and explaining the essence of this utility model; interpreting them as any additional limitation would contradict the spirit of this utility model.

Claims

1. A chainsaw pressure reducing valve, comprising a valve body, a valve cover, and a valve core, characterized in that: The valve body has a through hole extending through both ends. The through hole includes a sealing channel, a pressure relief channel, and a pressure reducing channel arranged sequentially along its axial direction. The diameter of the sealing channel is a1, the diameter of the pressure relief channel is a2, and the diameter of the pressure reducing channel is a3, where a3 > a2 > a1. The pressure reducing channel is located at the end of the valve body connected to the chainsaw cylinder. The port of the pressure reducing channel has an outwardly flared sealing port. The valve core is inserted into the through hole, and one end of it has a sealing head adapted to the sealing port. The sealing port and the outer wall of the sealing head are adapted to seal. The other end of the valve core is located outside the valve body and connected to the operating component. The operating component drives the valve core to move axially back and forth relative to the through hole. The operating component includes a first connecting part, an extension part, and an operating part connected to the valve core. The end of the extension part relative to the first connecting part is the larger end, and the end of the extension part relative to the operating part is the smaller end. The cross-section of the operating part is T-shaped.

2. A chainsaw pressure reducing valve according to claim 1, characterized in that: The valve body has a limiting hole on its outer wall corresponding to the sealing channel, which is connected to the sealing channel. The limiting hole has a limiting component for positioning the valve core. The valve body has a vent hole on its outer wall that is connected to the pressure relief channel. The valve body includes a sealing part, a fixing part, and a second connecting part. The valve cover is fitted onto the sealing part. The end of the valve cover has a shaft hole that matches the valve core. The limiting hole is located on the outer circumferential wall of the sealing part. The vent hole is located on the outer wall of the fixing part. The outer circumferential wall of the second connecting part has an external thread that connects to the chainsaw cylinder thread. The outer circumferential wall of the valve core has a first positioning groove. The limiting component includes a ball that mates with the first positioning groove and a spring that is fixed at one end to the ball and abuts against the inner wall of the valve cover at the other end.

3. A chainsaw pressure reducing valve according to claim 1, characterized in that: The valve core is provided with an I-shaped connecting clip at one end of the operating component. The operating component is axially divided into a main body and a movable body with the valve core as the axis. The main body is provided with a limiting groove that matches the connecting clip at the position of the connecting clip. The movable body is provided with a receiving groove at the position of the connecting clip. When the main body and the movable body are closed, the connecting clip is located between the main body and the movable body.

4. A chainsaw pressure reducing valve according to claim 3, characterized in that: The main body has an inverted trapezoidal sliding protrusion on one side corresponding to the movable body. The sliding protrusion is located at the other end of the limiting groove opposite to the valve body. The movable body has a dovetail groove on one side corresponding to the main body that matches the sliding protrusion. The dovetail groove is connected to the receiving groove, and the receiving groove is open at one end corresponding to the valve body. The main body is engaged with the valve core, and the movable body is slidably engaged with the main body through the dovetail groove.

5. A chainsaw pressure reducing valve according to claim 4, characterized in that: A semi-annular elastic sealing ring is provided on the half side of the connecting card corresponding to the movable base, and the receiving groove is adapted to the outer diameter of the valve core.

6. A chainsaw pressure reducing valve according to claim 3, characterized in that: The main body and the movable body are respectively provided with semi-annular mounting grooves below the corresponding operating parts. When the two mounting grooves are closed, they form an annular groove, and an opening mounting ring is provided in the annular groove.

7. A chainsaw pressure reducing valve according to claim 3, characterized in that: The operating part is covered with an elastic heat-insulating sleeve.

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