Anti-blocking remote control carburetor for construction machinery

Abstract

This utility model discloses a remotely controlled anti-clogging carburetor for construction machinery, relating to the technical field of fuel engine parts for construction machinery. It solves the problems of dangerous manual operation of the choke in existing carburetors and fuel deterioration clogging the fuel line during long-term shutdown. The solution includes a carburetor body, a float chamber, a choke shaft with a limiting screw seat and a return torsion spring, a cable connector with a cable groove hinged to the body, and the two are connected by a hinged rod with plug-in shafts at both ends. A limiting baffle plate restricts the maximum closing stroke of the choke. The choke can be remotely controlled by an external cable and automatically resets upon release. The body integrates an oil inlet channel with a pipe joint, and an integrally formed valve seat within the channel forms the oil valve switch. Rotating the handle switches the oil circuit on / off. An oil drain bolt is located at the bottom of the float chamber. This utility model enables remote control of the choke from outside the engine compartment without needing to enter the engine compartment. When the machine is stopped, the oil inlet can be cut off and residual oil drained, preventing fuel gum from clogging and corroding the carburetor. The plug-in transmission structure is simple to assemble, shock-resistant, and stable, suitable for the harsh, long-term idle conditions of construction machinery.

Description

Technical Field

[0001] This utility model relates to the field of carburetor technology for fuel engines, and is particularly suitable for engines used in construction machinery such as excavators, loaders, and road rollers that operate under harsh conditions and have irregular start-stop cycles. Background Technology

[0002] Construction machinery operates long-term in dusty, vibrating, and confined outdoor environments, with unpredictable engine start-stop times. It is generally equipped with traditional carburetor structures, which present two major drawbacks with current technology: 1. The choke is difficult to operate and its start-up is unsafe. Traditional carburetor chokes only have an exposed manual pivot, requiring operators to reach into the narrow, hot engine compartment to rotate the choke shaft and close it during cold starts. Construction machinery has a compact engine compartment layout and dense piping, making it extremely easy to bump into hot pipes or sharp metal parts, causing burns and cuts. Furthermore, construction machinery often operates outdoors, and hands contaminated with oil and mud can slip, causing the choke to not close properly, resulting in insufficient fuel supply during cold starts and a low success rate. Without a remote linkage mechanism, operators must reach back in to reset the choke after starting, making the process cumbersome.

[0003] 2. Long-term storage can cause fuel to deteriorate, and the carburetor may become clogged, corroded, or fail. Construction machinery often experiences downtime of several days to months. Residual gasoline inside the float chamber oxidizes and deteriorates over time, forming gum and sludge deposits that adhere and clog the carburetor's precision fuel passages, jets, and injectors. The gum is corrosive, and prolonged adhesion can cause jet corrosion and valve core sticking and jamming. This blockage leads to poor engine fuel supply, manifesting as difficulty starting, power loss, and idling vibration; in severe cases, it can prevent ignition altogether. Repair requires complete disassembly and cleaning of the fuel system, resulting in high costs and significant downtime.

[0004] Existing solutions can only alleviate the blockage problem by periodically venting the fuel in the float chamber manually. There is no integrated oil circuit shut-off structure, and venting the fuel requires additional disassembly and reassembly of the oil pipe, which is complicated. The choke has no cable-operated remote linkage structure, which cannot meet the operating requirements of the narrow engine room of engineering machinery. The overall structure has many assembly parts, large transmission clearance, and low production and assembly efficiency, and cannot simultaneously solve the two major pain points of remote choke control and oil circuit shut-off and anti-blockage during shutdown. Utility Model Content

[0005] To address the shortcomings of existing carburetors in construction machinery, such as the dangerous and cumbersome operation of the manual choke, fuel deterioration and corrosion during long-term shutdowns, lack of integrated fuel cut-off structure in the fuel circuit, and low assembly efficiency of the choke transmission mechanism, this utility model provides a remote-controlled anti-clogging carburetor for construction machinery. The aim is to achieve: 1. Remote linkage control of the choke cable, eliminating the need for manual operation inside the engine compartment, and automatic reset after startup; 2. Direct cut-off of fuel supply to the float chamber during shutdown, preventing long-term immersion of the carburetor's internal precision components in fuel, thus preventing gum buildup and corrosion; 3. Simplified choke transmission assembly structure, improving transmission stability and production assembly efficiency.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a remotely controlled anti-blocking carburetor for engineering machinery, comprising a carburetor body and a float chamber. The carburetor body is provided with a throat, and a rotatable choke and a throttle valve are provided inside the throat. The choke is fixedly connected to a choke shaft extending out of the carburetor body. The carburetor body is characterized by: a remotely linked choke mechanism and a controllable fuel inlet mechanism communicating with the float chamber; a drain bolt is fitted at the bottom of the float chamber; the remotely linked choke... The door mechanism includes a limiting screw seat, a return torsion spring, a cable connector, and a hinge rod. The limiting screw seat is fixed to the top of the choke shaft. The cable connector is hinged to the carburetor body and drives the limiting screw seat through the hinge rod. The cable connector has a cable connection groove for connecting an external control cable. The controllable fuel inlet mechanism includes a fuel inlet channel integrally formed in the carburetor body and a fuel valve switch structure located in the fuel inlet channel. A pipe joint is assembled at the outer end of the fuel inlet channel. The fuel valve switch structure can switch the fuel inlet channel on and off to control the fuel entering the float chamber.

[0007] The present invention is further configured such that: the remote linkage choke mechanism also includes a first limiting protrusion and a fixed limiting plate disposed on the carburetor body; a reset torsion spring is sleeved on the choke shaft, and the two ends of the reset torsion spring respectively cooperate with the choke shaft and the first limiting protrusion, driving the choke to remain open under normal conditions and causing the limiting rotary seat to abut against the first limiting protrusion; the fixed limiting plate is bent upward to form a limiting folding plate, and when the pull cable is pulled to close the choke to the maximum stroke, the pull cable connecting seat and the limiting folding plate abut against the limiting plate.

[0008] The present invention is further configured such that: both ends of the hinge rod are bent downwards to form plug-in shafts, and the two plug-in shafts are connected to the limiting screw seat and the middle of the cable connecting seat without fasteners to achieve transmission connection; one end of the cable connecting seat is rotatably assembled with the carburetor body through a rotating shaft.

[0009] The present invention is further configured such that: the oil inlet channel is divided into an oil inlet channel connecting the float chamber and an access channel connecting the pipe joint; the oil valve switch structure includes a valve seat integrally formed with the carburetor body, a valve cavity is provided in the valve seat, a sealing plug and a stopcock are placed in sequence in the valve cavity, and a valve cover is installed to seal the opening of the valve cavity.

[0010] The present invention is further configured such that: the bottom of the valve seat is provided with a first oil passage hole that connects to the oil inlet channel and a second oil passage hole that connects to the access channel, and the first oil passage hole and the second oil passage hole are arranged vertically and parallel; the sealing plug is provided with connecting holes that correspond to the first oil passage hole and the second oil passage hole respectively; the bottom surface of the valve plug is fitted with the sealing plug and is provided with an arc-shaped connecting groove.

[0011] The present invention is further configured such that: an arc-shaped limiting groove is provided on the side wall of the valve seat, and an operating handle is provided on the outer wall of the plug that extends through the arc-shaped limiting groove; when the operating handle is rotated to one side of the limiting groove, the arc-shaped connecting groove connects the two sets of connecting holes, and the oil circuit is opened; when rotated to the other side, the plug blocks the connecting hole, and the oil circuit is cut off.

[0012] The present invention is further configured such that: one end of the reset torsion spring is inserted into the outer wall of the windbreak door shaft, and the other end abuts against the side wall of the first limiting protrusion to provide reset torque.

[0013] The present invention is further configured such that: the valve cover is threadedly assembled on the top of the valve seat and presses down on the sealing plug and the plug, so as to ensure that the plug and the sealing plug are sealed and fitted together.

[0014] The present invention is further configured such that the drain bolt is threadedly sealed to the bottom of the float chamber, and the residual fuel inside the float chamber can be emptied by removing the drain bolt.

[0015] The beneficial effects of this utility model are: (1) Remote control of the choke door, suitable for harsh and narrow engine compartments of engineering machinery: The choke door is linked by the cable connecting seat and the hinge rod. The operator can close the choke door and complete the cold start by pulling the cable outside the engine compartment. After releasing the cable, the reset torsion spring automatically drives the choke door to reset and fully open. There is no need to reach into the high temperature and narrow engine compartment, avoiding the risk of burns and scratches, simplifying the start-up operation process, and significantly improving the success rate of cold start. The fixed limit plate and the limit folding plate limit the maximum closing stroke of the choke door, and there is no overtravel jamming in the transmission, and the structural stability is stronger.

[0016] (2) Plug-in hinge rod, reducing production costs and improving assembly efficiency: The two ends of the hinge rod are bent into plug-in shafts in one piece, without the need for screws or pins. The limit screw seat and cable connection seat are directly plugged in, reducing the amount of standard fasteners and shortening the assembly time on the production line. The transmission gap is small and it is not easy to loosen under vibration conditions, making it suitable for the strong vibration operation environment of engineering machinery.

[0017] (3) Integrated oil circuit shut-off valve to prevent carburetor blockage and corrosion from the source: The oil inlet channel has an integrated oil valve switch that is integrally formed with the body. When the machine is stopped for a long time, the oil circuit from the fuel tank to the float chamber can be cut off by rotating the handle, which avoids the fuel continuously soaking the internal metering orifice and oil passage of the carburetor. After the machine is stopped, the drain bolt at the bottom of the float chamber can be unscrewed to drain the residual fuel. The double protection prevents the formation of gum and deposits by gasoline oxidation, eliminates the problems of oil circuit blockage, component corrosion and valve core sticking, and greatly reduces the frequency of maintenance and maintenance costs.

[0018] (4) High structural integration, few parts, shock resistant and durable: The valve seat and carburetor body are integrally die-cast, reducing the risk of oil leakage from separate seals; the oil passage holes are arranged vertically and parallel, and the sealing plug and the rotary plug are in plane fit and seal, ensuring stable sealing performance under the bumpy and vibrating conditions of engineering machinery, with no risk of oil leakage; the overall structure is compact, does not occupy additional engine compartment installation space, and is suitable for various small engineering machinery gasoline engines.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 The three-dimensional representation of the specific embodiment of this utility model Figure 1 ; Figure 2 The three-dimensional representation of the specific embodiment of this utility model Figure 2 ; Figure 3 Partial section of the controllable oil inlet mechanism Figure 1 ; Figure 4 This is an exploded view of the controllable oil inlet mechanism. Figure 5 Partial section of the controllable oil inlet mechanism Figure 2 .

[0021] Explanation of reference numerals in the attached drawings: 1. Carburetor body; 2. Float chamber; 3. Throat; 4. Choke; 6. Choke shaft; 7. Limiting screw seat; 8. First limiting protrusion; 9. Return torsion spring; 10. Cable connector; 11. Rotary shaft; 12. Hinge rod; 13. Cable connection groove; 14. Insert shaft; 15. Fixed limiting plate; 16. Limiting folding plate; 18. Pipe joint; 19. Oil valve switch structure; 20. Oil inlet channel; 21. Access channel; 22. Valve seat; 23. Valve cavity; 24. Sealing plug; 25. Plug; 26. Valve cover; 27. First oil passage hole; 28. Second oil passage hole; 29. ​​Connecting hole; 30. Arc-shaped connecting groove; 31. Arc-shaped limiting groove; 32. Operating handle; 33. Drain bolt. Detailed Implementation

[0022] The present invention will be described in detail below through embodiments, which are only used to further illustrate the present invention and should not be construed as limiting the scope of protection of the present invention.

[0023] like Figure 1 — Figure 5 As shown, this embodiment discloses a remote-controlled anti-blocking carburetor for engineering machinery, comprising a carburetor body 1 and a float chamber 2. A throat 3 is provided through the inside of the carburetor body 1. A choke 4 and a throttle valve 5 are rotatably mounted inside the throat 3, respectively. A choke spool 6 is fixedly inserted through the center of the choke 4, and the upper end of the choke spool 6 extends vertically upward through the upper surface of the carburetor body 1.

[0024] A reset torsion spring 9 is coaxially sleeved on the outside of the choke shaft 6, and a first limiting protrusion 8 is integrally formed on the upper surface of the carburetor body 1; a limiting screw seat 7 is fixedly installed at the top of the choke shaft 6, one end of the reset torsion spring 9 is inserted and fixed to the outer wall of the choke shaft 6, and the other end abuts against the side wall of the first limiting protrusion 8; when there is no external force pulling, the reset torsion spring 9 continuously provides rotational torque, which drives the choke shaft 6 to rotate so that the choke 4 is fully opened, and the side of the limiting screw seat 7 fits against the first limiting protrusion 8 to complete the maximum opening limit.

[0025] A cable connector 10 is rotatably mounted on the side wall of the carburetor body 1 via a pivot 11. The cable connector 10 rotates and swings around the pivot 11. A hinge rod 12 is assembled between the middle of the cable connector 10 and the side end face of the limiting screw seat 7. The two ends of the hinge rod 12 are bent downwards vertically to form insertion shafts 14. The two insertion shafts 14 are respectively inserted into the preset insertion holes of the limiting screw seat 7 and the cable connector 10, realizing fastener-free insertion transmission, which is convenient to assemble and has small transmission gap. A concave cable connection groove 13 is opened at the end of the cable connector 10 away from the pivot 11. The end of the operating cable is inserted into the cable connection groove 13 to realize remote control from outside the engine compartment.

[0026] A fixed limiting plate 15 is riveted to the side wall of the carburetor body 1. The fixed limiting plate 15 is bent vertically upward to form a limiting fold plate 16. When the external cable is pulled, the cable connecting seat 10 rotates around the rotating shaft 11 and drives the limiting rotating seat 7 to rotate synchronously through the hinge rod 12, and the choke 4 closes. When the side wall of the cable connecting seat 10 rotates to fit the limiting fold plate 16, the choke 4 reaches its maximum closing opening to prevent excessive rotation from causing structural deformation. After the cable is released, the reset torsion spring 9 drives the choke shaft 6, the limiting rotating seat 7, the hinge rod 12, and the cable connecting seat 10 to reset as a whole. The cable connecting seat 10 separates from the limiting fold plate 16, and the choke 4 automatically opens fully.

[0027] The carburetor body 1 has an integrally formed oil inlet channel on the side that connects to the float chamber 2. The outward-facing end of the oil inlet channel is threaded to fix the pipe joint 18, which is used to connect to the external fuel delivery pipeline. The oil inlet channel is divided into two sections: one is an oil inlet channel 20 that connects downward to the float chamber 2, and the other is an access channel 21 that connects horizontally to the pipe joint 18. The oil valve switch structure 19 is integrated at the intersection of the two channels.

[0028] The fuel valve switch structure 19 includes a valve seat 22 integrally die-cast with the carburetor body 1. The valve seat 22 has a closed valve chamber 23 inside. Inside the valve chamber 23, from bottom to top, a sealing plug 24 and a stopcock 25 are placed sequentially. The top opening of the valve chamber 23 seals and presses against the valve cover 26. The valve cover 26 is fixedly sealed to the valve chamber 23 by threads to prevent fuel overflow. The bottom of the valve seat 22 has a first oil passage hole 27 and a second oil passage hole 28 vertically arranged. The lower end of the first oil passage hole 27 connects to the oil inlet channel 20, and the lower end of the second oil passage hole 28 connects to the access channel 21. The two oil passage holes are vertically parallel and closely spaced. The sealing plug 24 has two connecting holes 29 on its plate, which are vertically aligned and connected to the first oil passage hole 27 and the second oil passage hole 28, respectively. The sealing plug 24 also has two positioning holes, which cooperate with the positioning pins at the bottom of the valve chamber 23 to achieve the positioning of the sealing plug.

[0029] The lower surface of the stopcock 25 is completely flat and fits the upper surface of the sealing plug 24. An arc-shaped connecting groove 30 is opened on the bottom surface of the stopcock 25. An arc-shaped limiting groove 31 is opened on the side wall of the valve seat 22. An operating handle 32 is integrally formed by extending the outer wall of the stopcock 25 outward. The operating handle 32 extends through the arc-shaped limiting groove 31 to the outside of the valve seat 22 and can only rotate at a limited angle along the arc-shaped limiting groove 31.

[0030] Normal operating fuel supply status: When the operator moves the operating handle 32 to the extreme position of the arc-shaped limit groove 31 near the oil inlet channel 20, the arc-shaped connecting groove 30 on the bottom surface of the stopcock 25 simultaneously covers the two connecting holes 29. The fuel in the tank flows into the float chamber 2 through the pipe connector 18, the inlet channel 21, the second oil passage 28, the arc-shaped connecting groove 30, the first oil passage 27, and the oil inlet channel 20, and the oil circuit is fully connected.

[0031] Long-term shutdown fuel cut-off protection mode: Rotate the operating handle 32 to the extreme position on the other side of the arc-shaped limit groove 31. The bottom surface of the plug 25 without groove is completely pressed and sealed to block the upper end face of the two connecting holes 29, cutting off the fuel line from the inlet channel 21 to the fuel inlet channel 20. Fuel in the tank cannot enter the float chamber 2. The bottom of the float chamber 2 is threaded with a drain bolt 33. Unscrewing the drain bolt 33 will empty the residual gasoline inside the float chamber 2, completely avoiding the long-term immersion of fuel in the precision fuel passages and metering holes inside the carburetor, and preventing gum deposits, corrosion and blockage.

Claims

1. A remote-controlled anti-blocking carburetor for engineering machinery, comprising a carburetor body (1) and a float chamber (2), wherein the carburetor body (1) is provided with a throat (3), and a rotatable choke (4) and a throttle valve are provided inside the throat (3), wherein the choke (4) is fixedly connected to a choke shaft (6) extending out of the carburetor body (1) at its upper end, characterized in that: The carburetor body (1) is provided with a remote linkage choke mechanism and a controllable fuel inlet mechanism that connects to the float chamber (2). The bottom of the float chamber (2) is equipped with a drain bolt (33). The remote linkage choke mechanism includes a limiting screw seat (7), a reset torsion spring (9), a cable connector seat (10), and a hinge rod (12). The limiting screw seat (7) is fixed to the top of the choke shaft (6). The cable connector seat (10) is hinged to the carburetor body (1) and is driven by the limiting screw seat (7) through the hinge rod (12). The cable connector seat (10) is provided with a cable connection groove (13) for external control cable. The controllable fuel inlet mechanism includes a fuel inlet channel integrally formed in the carburetor body (1) and a fuel valve switch structure (19) provided in the fuel inlet channel. The outer end of the fuel inlet channel is equipped with a pipe joint (18). The fuel valve switch structure (19) can switch the fuel inlet channel on and off to control the fuel entering the float chamber (2).

2. The anti-blocking remote control carburetor for engineering machinery according to claim 1, characterized in that, The remote linkage choke mechanism also includes a first limiting protrusion (8) and a fixed limiting plate (15) located on the carburetor body (1); a reset torsion spring (9) is sleeved on the choke shaft (6), and the two ends of the reset torsion spring (9) are respectively engaged with the choke shaft (6) and the first limiting protrusion (8). Under normal conditions, the choke (4) is driven to remain open and the limiting rotating seat (7) abuts against the first limiting protrusion (8); the fixed limiting plate (15) is bent upward to form a limiting folding plate (16). When the cable is pulled to close the choke (4) to the maximum stroke, the cable connecting seat (10) abuts against the limiting folding plate (16) for limiting.

3. The anti-blocking remote control carburetor for engineering machinery according to claim 2, characterized in that, The hinge rod (12) is bent downwards at both ends to form a plug shaft (14). The two plug shafts (14) are connected to the middle of the limiting screw seat (7) and the cable connecting seat (10) without fasteners to achieve transmission connection. One end of the cable connecting seat (10) is rotated and assembled with the carburetor body (1) through the rotating shaft (11).

4. The anti-blocking remote control carburetor for engineering machinery according to claim 1, characterized in that, The oil inlet channel is divided into an oil inlet channel (20) connecting the float chamber (2) and an access channel (21) connecting the pipe joint (18); the oil valve switch structure (19) includes a valve seat (22) integrally formed with the carburetor body (1), a valve cavity (23) is provided in the valve seat (22), a sealing plug (24) and a valve plug (25) are placed in the valve cavity (23) in sequence, and a valve cover (26) is installed at the opening of the valve cavity (23).

5. The anti-blocking remote control carburetor for engineering machinery according to claim 4, characterized in that, The bottom of the valve seat (22) is provided with a first oil passage (27) connecting the oil inlet channel (20) and a second oil passage (28) connecting the inlet channel (21). The first oil passage (27) and the second oil passage (28) are arranged vertically and parallel. The sealing plug (24) is provided with connecting holes (29) corresponding to the first oil passage (27) and the second oil passage (28) respectively. The bottom surface of the valve (25) is attached to the sealing plug (24) and is provided with an arc-shaped connecting groove (30).

6. The anti-blocking remote control carburetor for engineering machinery according to claim 5, characterized in that, The valve seat (22) has an arc-shaped limiting groove (31) on its side wall, and the outer wall of the plug (25) is provided with an operating handle (32) that passes through the arc-shaped limiting groove (31); when the operating handle (32) is rotated to one side of the limiting groove, the arc-shaped connecting groove (30) connects the two sets of connecting holes (29) and the oil circuit is connected; when rotated to the other side, the plug (25) blocks the connecting hole (29) and the oil circuit is cut off.

7. The anti-blocking remote control carburetor for engineering machinery according to claim 2, characterized in that, One end of the reset torsion spring (9) is inserted into the outer wall of the windbreak door shaft (6), and the other end abuts against the side wall of the first limiting protrusion (8) to provide reset torque.

8. The anti-blocking remote control carburetor for engineering machinery according to claim 4, characterized in that, The valve cover (26) is threaded onto the top of the valve seat (22) and presses down on the sealing plug (24) and the valve plug (25) to ensure that the valve plug (25) and the sealing plug (24) are sealed and fitted together.

9. The anti-blocking remote control carburetor for engineering machinery according to claim 1, characterized in that, The drain bolt (33) is threadedly sealed to the bottom of the float chamber (2). Removing the drain bolt (33) will empty the residual fuel inside the float chamber (2).

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