A carburetor pull-to-stop fuel cut-off device

Abstract

The application discloses a carburetor zipper type fuel cut-off device, a guide hole is arranged on a float cover coaxially with a flow channel and is arranged at intervals, a top driving part is slidably arranged in the guide hole, a sealing head is arranged at one end of the top driving part towards the flow channel, the sealing head blocks or opens the flow channel when the top driving part moves axially along the guide hole, an end cover is connected with the float cover and covers the outer end of the guide hole, and a containing cavity is formed towards the opening of the guide hole, a transmission part is contained in the containing cavity and is connected with the other end of the top driving part, a diaphragm is clamped between the transmission part and the top driving part, the outer edge of the diaphragm is clamped between the joint surface of the end cover and the float cover, and the containing cavity and the guide hole are sealed and separated, the diaphragm is tensioned when the sealing head blocks the flow channel, one end of a sliding column in the containing cavity is connected with the transmission part, the other end of the sliding column slides out of the end cover, a driving plate is rotatably arranged outside the end cover, when the driving plate is rotated by an external force to a set angle, a step surface on the driving plate abuts against the sliding column, and the sliding column is moved towards the flow channel.

Description

Technical Field

[0001] This application relates to the field of dual-fuel carburetor technology, specifically a carburetor pull-lock fuel cut-off device. Background Technology

[0002] The dual-fuel carburetor is a type of carburetor commonly used in general-purpose engines, such as... Figures 1-2 As shown, the carburetor body typically has an air intake port 15 for inputting natural gas and a fuel inlet port 16 for inputting fuel. When using natural gas, fuel enters the float chamber 14 through the fuel inlet port 16, flows through the flow channel 12 into the main jet 13, and then enters the mixing chamber to mix with air before being regulated and delivered to the engine by the throttle valve. When using natural gas, the natural gas input through the air intake port 15 directly enters the carburetor's mixing chamber to mix with air before being regulated and delivered to the engine by the throttle valve. In this case, since no fuel is needed, the fuel line must be cut off during the use of natural gas to ensure normal engine operation. Existing fuel cut-off devices of this type have complex structures and high costs, and improvements are necessary. Summary of the Invention

[0003] The purpose of this application is to provide a carburetor pull-lock fuel cut-off device to solve the problems in the prior art.

[0004] To achieve the above objectives, this application provides the following technical solution: a carburetor pull-lock type fuel cut-off device, comprising a float chamber 14 formed by a float cover 1 and the carburetor body, wherein the float cover 1 is provided with a flow channel 12 connecting the main jet 13 of the carburetor and the float chamber 14, and further comprising: Guide holes 101 are provided on the float cover 1, coaxial with the flow channel 12 and spaced apart; An actuating member 9 is slidably fitted inside the guide hole 101, and a sealing head 10 is installed at one end facing the flow channel 12. When the actuating member 9 is axially displaced along the guide hole 101, the sealing head 10 blocks or opens the flow channel 12. End cap 2 is connected to the float cap 1 and covers the outer end of the guide hole 101, and forms a receiving cavity 201 that opens toward the guide hole 101; Transmission component 6 is housed in the receiving cavity 201 and connected to the other end of the actuating component 9; The diaphragm 7 is sandwiched in the middle between the transmission member 6 and the actuating member 9, and its outer edge is clamped between the mating surfaces of the end cap 2 and the float cap 1, so as to seal and separate the receiving cavity 201 from the guide hole 101; the diaphragm 7 is tensioned when the sealing head 10 blocks the flow channel 12. The sliding column 5, located inside the receiving cavity 201, has one end connected to the transmission member 6, and the other end slides out of the end cover 2; The drive plate 3 is rotatably disposed outside the end cover 2. When the drive plate 3 is rotated by an external force to a set angle, the stepped surface 302 on the drive plate 3 abuts against the sliding column 5, so as to move the sliding column 5 toward the flow channel 12.

[0005] Furthermore, a valve seat 11 is provided at the opening position of the flow channel 12 facing the float chamber 14, and the sealing head 10 is formed with a conical head that mates with the opening surface of the valve seat 11.

[0006] Furthermore, the end cap 2 is provided with a rotating shaft 4 for rotating support of the drive plate 3, and the rotating shaft 4 is parallel to the axis of the receiving cavity 201.

[0007] Furthermore, the transmission member 6 includes an outer shell 601 connected to the bottom of the actuating member 9, and an inner shell 602 slidably housed within the outer shell 601. A radially protruding annular platform 605 is formed on the outer wall of the inner shell 602. Inwardly folded tongues 604 are evenly distributed around the side wall of the outer shell 601. A buffer spring 603 is provided between the outer shell 601 and the inner shell 602. The elastic force of the buffer spring 603 keeps the inner shell 602 away from the bottom of the outer shell 601 so that the annular platform 605 abuts against the folded tongues 604.

[0008] Furthermore, a pull rope connector 17 is connected to the drive plate 3 for connecting to the pull rope 20; a torsion spring 18 is provided on the outer sleeve of the rotating shaft 4 for resetting the drive plate 3 and closing the flow channel 12 after the tension of the pull rope 20 is released.

[0009] Furthermore, the sliding column 5 includes a rod 501, a flange 502, and a ball 503 connected in sequence. The rod 501 is slidably engaged with the end cap 2 and connected to the inner housing 602. The flange 502 is located outside the end cap 2. The retraction spring 8 is sleeved on the outside of the rod 501 at both ends and abuts against the end cap 2 and the flange 502 respectively. The ball 503 is used to contact and engage with the stepped surface 302.

[0010] Furthermore, the end cap 2 extends parallel to the rotating shaft 4 to form a limiting post 202, and the drive plate 3 has an abutting edge 301 on one side wall facing the limiting post 202. When the stepped surface 302 contacts the ball part 503, the abutting edge 301 abuts against the limiting post 202.

[0011] Furthermore, a tapered section 102 is formed at the end of the guide hole 101 facing the end cap 2.

[0012] Furthermore, the outer wall of the actuating member 9 is evenly provided with concave straight grooves 901, which are parallel to the axis of the actuating member 9.

[0013] Furthermore, the end cap 2 is equipped with a retaining plate 19, which has an open retaining groove 1901 for guiding the pull rope 20.

[0014] The working principle and beneficial technical effects of this application are as follows: The carburetor pull-lock fuel cut-off device provided in this application, when using natural gas, only requires an external force to rotate the drive plate so that its stepped surface abuts against the ball part on the sliding column, causing the sliding column to move in the direction of the flow channel, thereby driving the sealing head to move and blocking the flow channel, cutting off the passage of fuel in the float chamber to the main metering orifice, and realizing the fuel cut-off operation. The structure is simple and the operation is convenient. The transmission component is designed as an elastic connection structure consisting of a sliding fit between the outer shell and the inner shell, and the action of a buffer spring, so that the sealing head always maintains a constant sealing pressure when blocking the flow channel opening, thereby ensuring the sealing fuel cut-off effect. By forming concave straight grooves evenly distributed on the outer wall of the jacking component, the guiding accuracy of the jacking component in the guide hole is ensured, and the two ends of the jacking component are in a connected state, reducing the resistance caused by fuel when the jacking component moves, making the fuel cut-off response more sensitive, which is far superior to the prior art. Attached Figure Description

[0015] Figure 1 This is a perspective view of the present application; Figure 2 This is a perspective view of this application from another angle; Figure 3 This is a cross-sectional view of the present application; Figure 4 This is a partial perspective view of this application; In the diagram: 1. Float cover; 101. Guide hole; 102. Tapered section; 2. End cap; 201. Receiving cavity; 202. Limiting post; 3. Drive plate; 301. Abutment edge; 302. Stepped surface; 4. Rotating shaft; 5. Sliding post; 501. Rod; 502. Flange; 503. Ball; 6. Transmission component; 601. Outer shell; 602. Inner shell; 603. Buffer spring; 604 1. Folding tongue; 605. Ring platform; 7. Diaphragm; 8. Retraction spring; 9. Pushing element; 901. Straight groove; 10. Sealing head; 11. Valve seat; 12. Flow channel; 13. Main measuring orifice; 14. Float chamber; 15. Air inlet; 16. Oil inlet; 17. Pull rope connector; 18. Torsion spring; 19. Clamping plate; 1901. Clamping groove; 20. Pull rope; 21. Rotating plate; 22. Connecting pin. Detailed Implementation

[0016] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0017] Please see Figures 1 to 4 A carburetor pull-lock fuel cut-off device includes a float chamber 14 formed by a float cover 1 and the carburetor body. The float cover 1 has a flow channel 12 connecting the main jet 13 of the carburetor and the float chamber 14. It also includes a guide hole 101, an actuating member 9, an end cap 2, a transmission member 6, a diaphragm 7, a sliding column 5, and a drive plate 3. Guide holes 101 are provided on the float cover 1, coaxial with the flow channel 12 and spaced apart; the actuating member 9 is slidably fitted inside the guide hole 101, and a sealing head 10 is installed at the end facing the flow channel 12. When the actuating member 9 moves axially along the guide hole 101, the sealing head 10 blocks or opens the flow channel 12; the end cap 2 is connected to the float cover 1 and covers the outer end of the guide hole 101, forming a receiving cavity 201 that opens towards the guide hole 101; the transmission member 6 is housed in the receiving cavity 201 and connected to the other end of the actuating member 9. The axial length of the receiving cavity 201 is adapted to the moving distance of the transmission member 6; the diaphragm 7 is sandwiched between the transmission member 6 and the actuating member 9 in the middle, and its outer edge is clamped between the mating surfaces of the end cover 2 and the float cover 1, thereby sealing and isolating the receiving cavity 201 from the guide hole 101, thus effectively preventing fuel in the float chamber 14 from leaking into the receiving cavity 201 through the guide hole 101; when the sealing head 10 blocks the flow channel 12, the diaphragm 7 is tensioned, thus, when used to push the sealing head 10 to block the flow channel 12... When the external force 2 disappears, the diaphragm 7 also helps the sealing head 10 to retract and reset, opening the flow channel 12. At the same time, the diaphragm 7 is only stretched and tightened when the sealing head 10 blocks the flow channel 12. Therefore, after its reset, it is in a natural state of elastic recovery, which is beneficial to extending the service life of the diaphragm 7. One end of the sliding column 5 located in the receiving cavity 201 is connected to the transmission component 6, and the other end slides out of the end cover 2. The drive plate 3 is rotatably disposed outside the end cover 2. When the drive plate 3 is rotated by an external force to a set angle, the stepped surface 302 on the drive plate 3 abuts against the sliding column 5 to make the sliding column 5 move toward the flow channel 12. In this embodiment, the rotation direction of the drive plate 3 is perpendicular to the displacement direction of the sliding column 5. A stepped surface 302 protruding toward the sliding column 5 is provided on the body of the drive plate 3. The protrusion elevation of the stepped surface 302 is adapted to the stroke of the sliding column 5 driving the sealing head 10 to move, and the stepped surface 302 and the body plane of the drive plate 3 adopt a smooth transition.

[0018] According to the structure provided in this embodiment, the carburetor pull-lock fuel cut-off device provided in this application only requires an external force (such as the torsional force of the torsion spring 18 in this embodiment) to rotate the drive plate 3 so that the stepped surface 302 on it abuts against the ball part 503 on the sliding column 5, so that the sliding column 5 moves towards the flow channel 12, thereby driving the sealing head 10 to move and block the flow channel 12, cutting off the passage of fuel in the float chamber to the main metering orifice 13, thus realizing the fuel cut-off operation. The structure is simple and the operation is convenient.

[0019] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 A valve seat 11 is provided at the opening of the flow channel 12 facing the float chamber 14. The sealing head 10 is formed with a conical head that matches the opening surface of the valve seat 11. This makes the sealing head 10 and the valve seat 11 have a better sealing fit, resulting in a better sealing effect when blocking the flow channel 12 and a smoother opening.

[0020] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The end cap 2 is provided with a rotating shaft 4 for rotating support of the drive plate 3. The rotating shaft 4 is parallel to the axis of the receiving cavity 201. In this way, the rotation of the drive plate 3 can be smooth and stable, further improving the control sensitivity and stability of the sealing head 10.

[0021] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The transmission component 6 includes an outer shell 601 connected to the bottom of the actuating component 9, and an inner shell 602 slidably housed within the outer shell 601. A radially protruding annular platform 605 is formed on the outer wall of the inner shell 602. Inwardly folded tongues 604 are evenly distributed around the sidewall of the outer shell 601. A buffer spring 603 is provided between the outer shell 601 and the inner shell 602. The elastic force of the buffer spring 603 keeps the inner shell 602 away from the bottom of the outer shell 601, causing the annular platform 605 to abut against the folded tongues 604. Thus, the stepped surface 302 on the drive plate 3 presses against the sliding column 5. When the sliding column 5 pushes the inner housing 602 (see below), the buffer spring 603 pushes the outer housing 601, causing the pusher 9 to drive the sealing head 10 forward, thereby blocking the flow channel 12 and providing a continuous and constant sealing pressure. After the drive plate 3 is reset, that is, after the step surface 302 turns away from the area of ​​the sliding column 5, the buffer spring 603 simultaneously causes the inner housing 602 to retract to the ring platform 605 and abut against the folding tongue 604. Then, under the action of the rebound force of the diaphragm 7 and the retraction spring 8 (see below), the sealing head 10 quickly moves away from the opening surface of the flow channel 12, thereby opening the flow channel 12 with good sensitivity.

[0022] According to the structure provided in this embodiment, the transmission component 6 is designed as an elastic connection structure consisting of a sliding fit between the outer shell 601 and the inner shell 602, and the action of the buffer spring 603, so that the sealing head 10 always maintains a constant sealing pressure when blocking the flow channel 12, thereby ensuring the sealing oil cut-off effect, and has the advantage of good sensitivity when opening the flow channel 12.

[0023] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The drive plate 3 is connected to a pull rope connector 17 for connecting to the pull rope 20. A torsion spring 18 is fitted around the rotating shaft 4 to reset the drive plate 3 and close the flow channel 12 after the tension of the pull rope 20 is released. Specifically, after the tension of the pull rope 20 is released, the torsion spring 18 causes the stepped surface 302 of the drive plate 3 to rotate to the top of the sliding column 5, causing the sliding column 5 to move towards the flow channel 12, thereby driving the sealing head 10 to block the opening of the flow channel 12. It can be understood that after the pull rope 20 pulls the drive plate 3 to rotate to a set angle (at which point the stepped surface 302 rotates away from the sliding column 5), the position of the pull rope 20 will be locked, thus keeping the drive plate 3 in its current position. During this holding process, the sliding column 5, under the action of the retraction spring 8, drives the sealing head 10 away from the opening of the flow channel 12, keeping the flow channel 12 open. Here, the locking method for the pull rope 20 can be a snap-fit ​​or damping type, or other existing technical structures. Preferably, the drive plate 3 and the pull rope connector 17 can also be configured as a split structure with the rotating plate 21 and the connecting pin 22 connected. In this embodiment, this split structure is adopted, that is, the drive plate 3 and the rotating plate 21 are coaxially sleeved on the rotating shaft 4, the pull rope connector 17 is installed on the rotating plate 21, and the rotating plate 21 is connected to the drive plate 3 through a connecting pin 22.

[0024] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The sliding column 5 includes a rod 501, a flange 502, and a ball 503 connected in sequence. The rod 501 is slidably fitted with the end cap 2 and connected to the inner housing 602 (i.e., the end cap 2 has a through hole for the rod 501 to slide through). The flange 502 is located outside the end cap 2. The retraction spring 8 is sleeved on the outside of the rod 501 at both ends and abuts against the end cap 2 and the flange 502 respectively. The ball 503 is used to contact and fit with the stepped surface 302. According to the above structure provided in this embodiment, the retraction spring 8 is used to push the flange 502 to provide the main power for the sliding column 5 to reset, so that the sliding column 5 can be driven to retract and reset synchronously after the stepped surface 302 moves away from the area of ​​the sliding column 5. The design of the ball 503 helps to reduce the sliding friction resistance between the sliding column 5 and the stepped surface 302.

[0025] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4The end cap 2 extends parallel to the rotating shaft 4 to form a limiting post 202. The side wall of the drive plate 3 facing the limiting post 202 has an abutment edge 301. When the stepped surface 302 contacts the ball part 503, the abutment edge 301 abuts against the limiting post 202. According to the structure provided in this embodiment, the overtravel of the drive plate 3 when it rotates under the action of the torsion spring 18 can be effectively avoided, ensuring that the stepped surface 302 abuts against the ball part 503, thereby ensuring the reliability of the oil cut-off device.

[0026] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The end of the guide hole 101 facing the end cap 2 has a tapered section 102. In this embodiment, the larger end of the tapered section 102 faces the diaphragm 7. Thus, the tapered section 102 with the larger end facing the diaphragm 7 can effectively match the deformation of the diaphragm 7 when it is pushed by the driven member 6 towards the flow channel 12, which is beneficial to extending the service life of the diaphragm 7.

[0027] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The outer wall of the actuating member 9 is evenly provided with concave straight grooves 901, which are parallel to the axis of the actuating member 9. In this way, by evenly providing concave straight grooves 901 on the outer wall of the actuating member 9, the guiding accuracy of the actuating member 9 in the guide hole 101 is ensured, and the two ends of the actuating member 9 are in a connected state, which reduces the resistance caused by fuel when the actuating member 9 moves, and makes the fuel cut-off response more sensitive, which is far superior to the existing technology.

[0028] In another embodiment of this application, please refer to [the relevant document / reference]. Figures 1 to 4 The end cap 2 is equipped with a retaining plate 19, which forms an open retaining groove 1901 for guiding the pull rope 20. In this embodiment, the retaining groove 1901, the sliding column 5, and the rotating shaft 4 are coplanar, and the retaining groove 1901 and the rotating shaft 4 are respectively located on both sides of the sliding column 5. Thus, when the pull rope 20 pulls the drive plate 3 to rotate, the retaining groove 1901 can guide the pull rope 20 to ensure that the drive plate 3 rotates in the set direction. When the center of the pull rope connector 17 coincides with the center axis of the retaining groove 1901, the drive plate 3 reaches the maximum rotation angle. At this time, the step surface 302 is away from the ball part 503, and the flow channel 12 is in the open state.

[0029] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0030] In the description of this application, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application 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. Therefore, they should not be construed as limitations on this application.

[0031] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0032] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A carburetor pull-lock fuel cut-off device, comprising a float chamber (14) formed by a float cover (1) and the body of the carburetor, wherein the float cover (1) is provided with a flow channel (12) connecting the main jet (13) of the carburetor and the float chamber (14), characterized in that, Also includes: A guide hole (101) is provided on the float cover (1) and is coaxial with and spaced apart from the flow channel (12); The pusher (9) is slidably fitted into the guide hole (101), and a sealing head (10) is installed at one end facing the flow channel (12). When the pusher (9) moves axially along the guide hole (101), the sealing head (10) blocks or opens the flow channel (12). End cap (2) is connected to the float cap (1) and covers the outer end of the guide hole (101), and forms a receiving cavity (201) that opens toward the guide hole (101). The transmission component (6) is housed in the receiving cavity (201) and connected to the other end of the actuating component (9); The diaphragm (7) is sandwiched in the middle between the transmission member (6) and the actuating member (9), and its outer edge is held between the mating surfaces of the end cap (2) and the float cap (1) to seal and separate the receiving cavity (201) from the guide hole (101); the diaphragm (7) is tensioned when the sealing head (10) blocks the flow channel (12); The sliding column (5) is located in the receiving cavity (201), with one end connected to the transmission member (6) and the other end sliding out of the end cover (2). The drive plate (3) is rotatably disposed outside the end cover (2). When the drive plate (3) is rotated by an external force to a set angle, the stepped surface (302) on the drive plate (3) abuts against the sliding column (5) to make the sliding column (5) move toward the flow channel (12).

2. The carburetor pull-lock fuel cut-off device according to claim 1, characterized in that: The flow channel (12) is provided with a valve seat (11) at the opening position facing the float chamber (14), and the sealing head (10) is formed with a conical head that mates with the opening face of the valve seat (11).

3. The carburetor pull-lock fuel cut-off device according to claim 1, characterized in that: The end cap (2) is provided with a rotating shaft (4) for rotating support of the drive plate (3), and the rotating shaft (4) is parallel to the axis of the receiving cavity (201).

4. The carburetor pull-lock fuel cut-off device according to claim 3, characterized in that: The transmission component (6) includes an outer shell (601) connected to the bottom of the actuating component (9), an inner shell (602) slidably housed within the outer shell (601), a radially protruding annular platform (605) formed on the outer wall of the inner shell (602), and inwardly folded tongues (604) evenly distributed around the side wall of the outer shell (601). A buffer spring (603) is provided between the outer shell (601) and the inner shell (602). The elastic force of the buffer spring (603) causes the inner shell (602) to tend to move away from the bottom of the outer shell (601) so that the annular platform (605) abuts against the folded tongue (604).

5. The carburetor pull-lock fuel cut-off device according to claim 3, characterized in that: The drive plate (3) is connected to a pull rope connector (17) for connecting to the pull rope (20); the rotating shaft (4) is fitted with a torsion spring (18) for resetting the drive plate (3) and closing the flow channel (12) after the tension of the pull rope (20) is released.

6. The carburetor pull-lock fuel cut-off device according to claim 4, characterized in that: The sliding column (5) includes a rod (501), a flange (502), and a ball (503) connected in sequence. The rod (501) is slidably engaged with the end cap (2) and connected to the inner shell (602). The flange (502) is located outside the end cap (2). The retraction spring (8) is sleeved on the outside of the rod (501) at both ends and abuts against the end cap (2) and the flange (502) respectively. The ball (503) is used to contact and engage with the stepped surface (302).

7. The carburetor pull-lock fuel cut-off device according to claim 6, characterized in that: The end cap (2) extends parallel to the rotating shaft (4) to form a limiting post (202). The drive plate (3) has an abutment edge (301) on one side wall facing the limiting post (202). When the stepped surface (302) contacts the ball (503), the abutment edge (301) abuts against the limiting post (202).

8. The carburetor pull-lock fuel cut-off device according to claim 1, characterized in that: The guide hole (101) has a tapered section (102) at one end facing the end cap (2).

9. The carburetor pull-lock fuel cut-off device according to claim 1, characterized in that: The outer wall of the actuating member (9) is uniformly provided with concave straight grooves (901), which are parallel to the axis of the actuating member (9).

10. The carburetor pull-lock fuel cut-off device according to claim 5, characterized in that: The end cap (2) is equipped with a retaining plate (19), which has an open slot (1901) for guiding the pull rope (20).

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