WO2017008212A1 - Carburetor with novel starter fuel system - Google Patents

Abstract

Disclosed is a carburetor with a starter fuel system, which comprises a fuel pocket of a fuel injector, a pump cover, a pump diaphragm, a carburetor body (10), a starting shaft, a throttle shaft (60) and a metering chamber cover, wherein the carburetor body is provided with a pump face (101), a metering chamber face (102), a throttle end face (103), a choke valve end face (104), a fuel inlet connection face (105) and a high and low speed nailing face (106); the fuel pocket of the fuel injector, the pump cover and the pump diaphragm are fixedly provided on the pump face of the carburetor body (10) in a successive manner via a bolt; a mixing chamber (107) is provided in the carburetor body (10); the starting shaft and the throttle shaft (60) penetrate through the mixing chamber and are provided obliquely in the carburetor body (10) with two ends respectively extending out of the fuel inlet connection face (105) and the high and low speed nailing face (106); and the metering chamber cover is fixedly provided on the metering chamber face (102) of the carburetor body (10) via a bolt. The carburetor does not need a secondary fuel pump, a fuel inlet and outlet check valve system, a fuel control orifice and a pulse control orifice and the like, and also does not need an air channel for preventing the fuel from being pumped out due to a crankshaft negative pressure, and the present invention has low costs and a simple structure.

Description

 Carburetor with new starting oil system Technical field

 The invention relates to the technical field of carburetor, in particular to a carburetor having a novel starting oil system.

Background technique

Most engines require a mixture (air/fuel) enrichment system to improve engine operation or start the engine. Concentrated systems are especially important when the engine is running in cold or fuel drain. With today's low emissions requirements, the engine's excess air ratio (λ) is already close to 1, and almost every engine's starting performance benefits from this. There are three ways to concentrate the mixture in the engine sector with carburetor: choke system, oiler system, fuel enrichment system.

technical problem

The choke system closes the front end of the carburetor inlet through the door piece to concentrate the mixture, allowing the negative pressure to draw more fuel from the oil passage in the opening direction of the intake hole, but the disadvantage of the choke system is that the user must completely close the resistance. The damper, let the engine crankcase run until the user is aware that the starting method is wrong (the engine tries to start and run, but the mixture is too thick and does not work). When the user finds that the starting method is wrong, the choke valve is partially opened to allow the engine to start and run, and then the engine is operated in the half-open state of the choke valve until the full heat engine is opened, and then the choke valve is fully opened. However, this operation is too complicated for users who are used to automatic operation today, often causing users to complain that the engine cannot be started, customer complaints, defective products are returned, and excessive warranty costs, but in fact the product quality is very good.

The oiler system needs to manually press the oil bubble, inject the fuel directly into the carburetor throat, and then enter the engine. However, the disadvantage of the oiler system is that the simple oiler cannot judge whether the number of pulling the rope is too much or too little, and the fuel entering the engine is too much or too little, so the user can easily take too much oil (sinking the tank) or taking the oil. Too little, in both cases, it is impossible or difficult to start the engine again, causing user dissatisfaction and expensive warranty costs.

US Patent US5706774, US7185623 and US The 7913659 uses a fuel enrichment system, a system that concentrates fuel. In the above patent, the fuel concentrating pump is a complete secondary fuel pump system that can pump fuel from the metering chamber through the oil inlet check valve into the secondary pump chamber, pushing the fuel out of the oil outlet hole and the check valve. , enter the carburetor throttle hole. While this system effectively overcomes the shortcomings of the above-described choke system and oiler system, the complexity of the system greatly increases the cost of the carburetor. Moreover, when the fuel flows from the metering chamber to the oil injector, the two check valves increase the fuel negative pressure in series, and the pressure drop causes the boiling point of the fuel to decrease, so when the temperature of the carburetor rises, the design in the above patent will The problem of air resistance causes the fuel to boil in the oil passage, causing the steam to accumulate in the metering chamber and the oil in the oil injector, resulting in difficulty in starting the engine and unstable performance.

Technical solution

In order to solve the problem of complicated structure and high cost of the carburetor in the prior art, the present invention discloses a carburetor with a novel starting oil system, including an oiler oil bubble, a pump cover, a pump diaphragm, and a chemical oil. a body, a starting shaft, a throttle shaft and a metering chamber cover, wherein the carburetor body is provided with a pump surface, a metering chamber surface, a throttle end surface, a choke end surface, an oil inlet connection surface, and a high and low speed nail surface, the oil filling The oil bulb, the pump cover and the pump membrane are sequentially fixed by bolts on the pump surface of the carburetor body, and the carburetor body is provided with a mixing chamber, and the mixing chamber is provided with a communication metering surface, a throttle opening end and three openings of the choke end surface, the starting shaft and the throttle shaft are disposed obliquely in the carburetor body through the mixing chamber, and the two ends respectively extend into the oil connection surface and the high and low speed nail surface, The metering chamber cover is fixed to the measuring chamber surface of the carburetor body by bolts.

As a further improvement of the present invention, the pump surface of the carburetor body is provided with a main pump oil chamber, a starting fuel chamber, a check valve, a check valve hole, a first oil passage, and a third start pulse passage, the main A first start pulse channel is disposed in the pump oil chamber, the start fuel chamber is provided with a second oil passage, and the second oil passage is in communication with the first oil passage, and the check valve is disposed in the check valve hole.

As a further improvement of the present invention, the throttle end face of the carburetor body is provided with a main pulse passage, and the main pulse passage is in communication with the main pump oil chamber.

As a further improvement of the present invention, the choke valve end surface of the carburetor body is provided with a second start pulse channel, and the second start pulse channel is simultaneously connected with the first start pulse channel and the third start pulse channel.

As a further improvement of the present invention, the bottom of the carburetor body is provided with a metering chamber cavity, and the metering chamber cavity is provided with a main nozzle, and the main nozzle is in communication with the mixing chamber.

As a further improvement of the present invention, the start shaft is provided with a sixth start pulse channel, and the sixth start pulse channel can communicate with the channel formed by the first start pulse channel, the second start pulse channel and the third start pulse channel. .

As a further improvement of the present invention, one end of the starting shaft protruding from the oil connection surface is provided with a locking rocker arm, a returning torsion spring and a fixing rod, and the fixing rod is disposed on the oil inlet connecting surface, the locking buckle The rocker arm is coupled to the fixed rod by a return torsion spring, and a throttle rocker arm is disposed at one end of the throttle shaft extending from the oil connection surface.

As a further improvement of the present invention, the top of the pump cover is provided with a one-way valve, the bottom portion is provided with a start pulse chamber and a fourth start pulse channel, and the fourth start pulse channel is connected with the start pulse chamber, and the start pulse chamber is Start the fuel chamber to match.

As a further improvement of the present invention, the pump diaphragm is provided with a fifth start pulse channel, and the fifth start pulse channel is connected to the fourth start pulse channel and the third start pulse channel.

As a further improvement of the present invention, the carburetor body is provided with a high-speed screw and an idle speed screw, and the measuring chamber cavity is provided with a high-speed oil passage and an idle oil passage, and the high-speed screw has a high-low speed nail surface from the carburetor body at one end. The other end extends into the metering chamber and communicates with the high-speed oil passage. One end of the idle screw protrudes from the high and low speed nail surface of the carburetor body, and the other end extends into the metering chamber to communicate with the idle oil passage.

Beneficial effect

The invention does not require a secondary oil pump, an oil inlet and outlet check valve system, a fuel control orifice, a pulse control orifice, and the like, and does not require an air passage to prevent fuel from being drawn out due to negative pressure of the crankshaft, and the present invention does not increase In the case of additional accessories, it has lower cost, fewer machining processes and tool change actions, fewer assembly processes and a more compact overall structure.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying for creative labor.

1 is a schematic structural view of an embodiment of the present invention;

2 is an exploded view of a first structure of an embodiment of the present invention;

3 is an exploded view of a second structure of an embodiment of the present invention;

4 is a top plan view of a carburetor body according to an embodiment of the present invention;

Figure 5 is a cross-sectional view taken along line A-A of Figure 4;

Figure 6 is a cross-sectional view taken along line C-C of Figure 4;

Figure 7 is a bottom plan view of the carburetor body in the embodiment of the present invention;

Figure 8 is a cross-sectional view taken along line B-B of Figure 7.

Marked in the figure: 10-carburetor body; 101-pump surface; 102-metering chamber surface; 103-throttle end face; 104-obstruction end face; 105-inlet connection surface; 106-high and low speed nail surface; Mixing chamber; 108-main pump oil chamber; 109-starting fuel chamber; 110-first oil passage; 111-third start pulse passage; 112-first start pulse passage; 113-second oil passage; 114-main Pulse channel; 115-second start pulse channel; 116-metering chamber cavity; 117-main nozzle; 118-idle screw; 119-high speed screw; 120-idle oil passage; 121-high speed oil passage; 122-throttle port; - choke door; 124 - metering chamber port; 125 - third oil passage; 126 - check valve hole; 127 - fourth oil passage; 20 - oiler oil bubble; 30 - pump cover; 301 - check valve; 302-start pulse chamber; 303-fourth start pulse channel; 304-check valve; 40-pump diaphragm; 401-fifth start pulse channel; 50-start shaft; 501-sixth start pulse channel; 502-lock Buckle arm; 503-return torsion spring; 504-fixed rod; 60-throttle shaft; 601-throttle shaft rocker arm; 70-metering chamber cover.

Embodiments of the invention

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, but not all embodiments.

As shown in FIGS. 1 to 3, a carburetor having a novel starting oil system includes an oiler oil bubble 20, a pump cover 30, a pump diaphragm 40, a carburetor body 10, a starting shaft 50, and a throttle shaft. 60 and metering chamber cover 70. The carburetor body 10 is provided with a pump surface 101, a metering chamber surface 102, a throttle end surface 103, a choke end surface 104, an oil inlet connection surface 105, and a high and low speed nail surface 106, an oil injector oil bubble 20, a pump cover 30 and a pump membrane. The sheet 40 is sequentially fixed to the pump face 101 of the carburetor body 10 by bolts. The carburetor body 10 is provided with a mixing chamber 107. The mixing chamber 107 is provided with three openings connecting the metering chamber surface 102, the throttle end surface 103 and the choke end surface 104, wherein the throttle port 122 is disposed at the throttle end surface 103. Upper, the choke port 123 is disposed on the choke end face 104, and the metering chamber port 124 is disposed on the metering chamber face 102. The starter shaft 50 and the throttle shaft 60 are disposed obliquely disposed in the carburetor body 10 through the mixing chamber 107, and the two ends respectively extend into the oil connection surface 105 and the high and low speed nail surface 106, and the metering chamber cover 70 is fixed by bolts. The metering chamber surface 102 of the carburetor body 10 is disposed.

The pump surface 101 of the carburetor body 10 is provided with a main pump oil chamber 108, a starting fuel chamber 109, a check valve 304, a check valve hole 126, a first oil passage 110 and a third start pulse passage 111, and a main pump oil chamber 108 is provided with a first start pulse channel 112, the start fuel chamber 109 is provided with a second oil passage 113, the second oil passage 113 is in communication with the first oil passage 110, and the check valve 304 is disposed in the check valve hole 126.

The throttle end face 103 of the carburetor body 10 is provided with a main pulse passage 114 that communicates with the main pump oil chamber 108.

The carburetor body 10 is provided with an idle screw 118 and a high speed screw 119. The bottom of the carburetor body 10 is provided with a metering chamber 116. The metering chamber 116 is provided with a main nozzle 117, and the main nozzle 117 is in communication with the mixing chamber 107.

One end of the starting shaft 50 extending out of the oil connection surface 105 is provided with a locking rocker arm 502, a returning torsion spring 503 and a fixing rod 504. The fixing rod 504 is disposed on the oil inlet connecting surface 105, and the locking rocker arm 502 is returned. The torsion spring 503 is snapped onto the fixed rod 504, and a throttle shaft rocker arm 601 is disposed at one end of the throttle shaft 60 extending from the oil connection surface 105.

A check valve 301 is arranged on the top of the pump cover 30, a start pulse chamber 302 and a fourth start pulse channel 303 are arranged at the bottom, and the fourth start pulse channel 303 is connected with the start pulse chamber 302, and the start pulse chamber 302 is matched with the start fuel chamber 109. .

The pump diaphragm 40 is provided with a fifth start pulse channel 401, and the fifth start pulse channel 401 is connected to the fourth start pulse channel 303 and the third start pulse channel 111.

As shown in FIG. 3 to FIG. 5, the choke valve end face 104 of the carburetor body 10 is provided with a second start pulse channel 115, and the second start pulse channel 115 is simultaneously connected with the third start pulse channel 111 and the first start pulse channel 112. The end of the second start pulse channel 115 is in communication with the first start pulse channel 112, and the first start pulse channel 112 is obliquely disposed within the carburetor body 10.

The starter shaft 50 is provided with a sixth start pulse channel 501, and the rotation starter shaft 50 can connect the sixth start pulse channel 501 to the channel composed of the first start pulse channel 112, the second start pulse channel 115, and the third start pulse channel 111. .

A fourth oil passage 127 is disposed in the carburetor body 10, and the fourth oil passage 127 is in communication with the check valve hole 126.

As shown in FIG. 6, the carburetor body 10 is further provided with a third passage 125, and the third passage 125 communicates with the second oil passage 113 and the main nozzle 117.

As shown in FIG. 7 and FIG. 8, the metering chamber 116 is provided with an idle oil passage 120 and a high speed oil passage 121. One end of the idle screw 118 extends from the high and low speed nail surface 106 of the carburetor body 10, and the other end projects into the metering chamber. 116 is in communication with the high speed oil passage 120. One end of the high speed screw 119 extends from the high and low speed nail surface 106 of the carburetor body 10, and the other end extends into the metering chamber cavity 116 to communicate with the high speed oil passage 121.

The working principle of the present invention will be briefly described below with reference to the above drawings.

Before the engine is started, the operator presses the oiler oil bubble 20. When the oil is quickly pumped, the internal pressure drops. First, the fuel sequentially passes through the check valve 304, the check valve hole 126, and the fourth oil passage 127 to enter the oiler oil bubble. 20, can effectively pump oil through the oiler oil bubble 20, while the high negative pressure of the oiler oil bubble 20 will also directly lead to fuel filling from the metering chamber cavity 116, the check valve 304 can simply and directly prevent the oiler oil bubble 20 Upon pressurization, fuel is withdrawn from the injector oil bubble 20 back into the metering chamber cavity 116. Second, the fuel is withdrawn from the metering chamber cavity 116, flows from the high speed oil passage 121 through the tip of the high speed screw 119, and sequentially passes through the main nozzle 117, the third oil passage 125, the second oil passage 113, the starting fuel chamber 109, and the first The oil passage 110 and the check valve 301 deliver fuel to the oil sump 20, when the fuel chamber 109 is filled with oil, and the check valve 301 can directly and directly prevent the oil sump 20 from being pressurized. The oiler bubble 20 is squeezed into the mixing chamber 107 through the main nozzle 117.

When the engine crankcase is running to start the engine, the engine piston generates alternating pulses of positive pressure and negative pressure in the crankcase, and the pulse enters the main pump oil chamber 108 through the main pulse passage 114, and the start shaft 50 rotates to make the sixth start pulse passage. The 501 is aligned with the third start pulse channel 111 of the carburetor body 10, and the pulse is sequentially passed from the main pump oil chamber 108 through the first start pulse channel 112, the second start pulse channel 115, the sixth start pulse channel 501, and the third start pulse. The channel 111, the fifth start pulse channel 401 of the pump diaphragm 40, and the fourth start pulse channel 303 of the pump cover 30 enter the start pulse chamber 302, and the start pulse chamber 302 matches the start fuel chamber 109. Under the action of the positive pulse pressure, the driving pump diaphragm 40 is lowered into the starting fuel chamber 109, and the fuel chamber 109 is activated to apply a positive pressure to the fuel. The essentially incompressible fuel will be applied through the second oil passage 113 and the third oil passage 125. The pressure is supplied to the main nozzle 117, and the fuel is forced to flow out from the main nozzle 117.

Since the crankcase pulse has periodicity, when the engine piston moves upward in the crankcase, the positive pressure becomes a negative pressure, and the negative pressure pulse suction pump diaphragm 40 rises to the start pulse chamber 302 of the pump cover 30 and is applied again. By the start of the fuel chamber 109, the fuel is withdrawn from the metering chamber cavity 116 through the high speed oil passage 121, flows through the tip of the high speed screw 119, and sequentially passes through the main nozzle 117, the third oil passage 125, the second oil passage 113, and the filling start fuel. Cavity 109.

The metering chamber 116 acts as a fuel quantity adjustment, allowing additional fuel to fill the metering chamber cavity 116 to ensure that there is sufficient fuel to replace the fuel used in the engine and drawn into the fuel chamber 109.

Whenever the starter shaft 50 is rotated to the position where the sixth start pulse channel 501 is aligned with the third start pulse channel 111, a pulse is generated from the fourth start pulse channel 303 to the start pulse chamber 302 alternating positive and negative pressures to make the pump The diaphragm 40 is repeatedly moved up and down in the starting fuel chamber 109.

This pump oil cycle continues as the engine crankcase runs until the engine is started, the heat engine, and then the operator adjusts the throttle shaft 60 to the throttle, the start shaft 50 rotates, and the sixth start pulse passage 501 is no longer aligned with the third start pulse. Channel 111, at which point the pulse no longer applies pressure to pump diaphragm 40.

Under the restriction of the idle screw 118 and the high speed screw 119, when the engine speed increases, the negative pressure of the main nozzle 117 increases, and the main nozzle 117 starts pumping oil from the high speed oil passage 121, and the fuel delivery can be automatically and effectively turned off.

The throttle shaft 60 may be partially opened or fully opened. When the throttle shaft rocker arm 601 is locked by the lock rocker arm 502, the throttle shaft 60 is partially opened to make the mixture denser and improve the acceleration effect; once the engine In the heat engine, the throttle shaft 60 will be in the fully open state, the throttle shaft rocker arm 601 is separated from the lock rocker arm 502, and the engine is returned to the idle running state.

The technical solution of the present invention has many advantages over the prior art, and the present invention does not require a secondary oil pump, an oil inlet and an oil return check valve system, a fuel control orifice, a pulse control orifice, and the like, and does not require an air passage to prevent The fuel is withdrawn due to the negative pressure of the crankshaft, and the present invention has lower cost, less machining and tool changeover operations, fewer assembly processes, and a more compact overall structure without adding additional components.

It should be noted that the present embodiment only discloses the technical solution that the oiler oil bubble 20 is integrally mounted on the pump cover 30. Obviously, it can also be realized by means of an external carburetor oil bubble connected by a hose, or applied to Other systems, such as mechanical pumps, peristaltic pumps, or electromechanical pump injectors, can fill fuel into the starting fuel chamber 109 before the engine crankcase is running, or while the engine crankcase is running.

The above is only the preferred embodiment of the present invention, and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., which are included in the spirit and scope of the present invention, should be included in the present invention. Within the scope of protection.

Claims (1)

1. A carburetor having a novel starting oil system, comprising: an oiler oil bubble, a pump cover, a pump diaphragm, a carburetor body, a starter shaft, a throttle shaft, and a metering chamber cover, said The oil body is provided with a pump surface, a metering chamber surface, a throttle end surface, a choke end surface, an oil inlet connection surface, and a high and low speed nail surface. The oil injector oil bulb, the pump cover and the pump diaphragm are sequentially fixed by bolts. a pumping chamber of the oil body, wherein the carburetor body is provided with a mixing chamber, and the mixing chamber is provided with three openings connecting the metering chamber surface, the throttle end surface and the choke end surface, the starting shaft and The throttle shaft is disposed obliquely in the carburetor body through the mixing chamber, and the two ends respectively extend into the oil connection surface and the high and low speed nail surface, and the measuring chamber cover is fixed by bolts to set the measuring chamber surface of the carburetor body on. 2. The carburetor having a novel starting oil system according to claim 1, wherein the pump face of the carburetor body is provided with a main pump oil chamber, a starting fuel chamber, a check valve, and a check valve. a first start pulse channel is disposed in the main pump oil chamber, the second oil passage is provided, and the second oil passage and the first oil are disposed in the main pump oil chamber The passage is connected, and the check valve is disposed in the check valve hole. 3. The carburetor having a novel starting oil system according to claim 2, wherein a throttle end face of the carburetor body is provided with a main pulse passage, and the main pulse passage is connected to the main pump oil chamber. . 4. The carburetor having a novel starting oil system according to claim 3, wherein a damper body end surface of the carburetor body is provided with a second start pulse channel, and the second start pulse channel is simultaneously The first start pulse channel is in communication with the third start pulse channel. The carburetor with a novel starting oil system according to claim 4, wherein the carburetor body is provided with a metering chamber cavity at the bottom, and a main nozzle is arranged in the measuring chamber cavity, the main The nozzle is in communication with the mixing chamber. The carburetor with a novel starting oil system according to claim 5, wherein the starting shaft is provided with a sixth starting pulse channel, and the sixth starting pulse channel is connectable by the first starting pulse A channel composed of a channel, a second start pulse channel, and a third start pulse channel. The carburetor having a novel starting oil system according to claim 6, wherein one end of the starting shaft extending from the oil inlet surface is provided with a locking rocker arm, a returning torsion spring and a fixing rod. The fixing rod is disposed on the oil inlet connecting surface, and the locking rocker arm is coupled to the fixing rod by a returning torsion spring, and a throttle rocker arm is disposed at one end of the throttle shaft extending from the oil inlet connecting surface. The carburetor according to claim 7, wherein the top of the pump cover is provided with a one-way valve, and the bottom portion is provided with a starting pulse chamber and a fourth starting pulse channel, wherein the The four start pulse channels are in communication with a start pulse chamber that matches the starting fuel chamber. The carburetor with a novel starting oil system according to claim 8, wherein the pump diaphragm is provided with a fifth starting pulse channel, and the fifth starting pulse channel is connected to the fourth starting pulse channel. With the third start pulse channel. 10. The carburetor having a novel starting oil system according to claim 9, wherein the carburetor body is provided with a high speed screw and an idle screw, and the measuring chamber cavity is provided with a high speed oil passage and an idle speed. In the oil passage, one end of the high speed screw protrudes from the high and low speed nail surface of the carburetor body, and the other end extends into the measuring chamber cavity to communicate with the high speed oil passage, and one end of the idle screw protrudes from the high and low speed nail surface of the carburetor body, and the other end The metering chamber is connected to the idle oil passage.