CN217632715U

CN217632715U - Throttle valve structure and carburetor

Info

Publication number: CN217632715U
Application number: CN202221978297.5U
Authority: CN
Inventors: 郭炜
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-07-28
Filing date: 2022-07-28
Publication date: 2022-10-21
Anticipated expiration: 2032-07-28

Abstract

The utility model provides a throttle structure and carburetor relates to carburetor technical field, and the throttle structure includes casing and throttle valve. The air inlet passage is formed in the shell in a penetrating mode along the axial direction of the shell, the throttle valve is movably connected to the shell and provided with a first guide surface, the first guide surface and the axial direction of the air inlet passage are arranged in an acute angle mode, and the radial size of the first guide surface is gradually reduced in the air inlet direction of the air inlet passage; the throttle valve is movable relative to the housing to adjust the area of the first guide surface in the intake passage. The first guide surface of the throttle valve and the axial direction of the air inlet channel are arranged at an acute angle, the radial size of the first guide surface is decreased progressively in the air inlet direction of the air inlet channel, and the first guide surface arranged in such a way has an airflow guiding effect so as to weaken the phenomenon of air turbulence generated by airflow in the air inlet channel, so that the airflow has strong capability of picking up fuel, the atomization effect of the fuel is good, and the fuel can provide enough power for an engine after being combusted.

Description

Throttle valve structure and carburetor

Technical Field

The utility model relates to a carburetor technical field especially relates to a throttle valve structure and carburetor.

Background

A carburetor, which is an important component of a vehicle such as a motorcycle, has a main function of mixing and atomizing fuel oil in a certain proportion with air so as to sufficiently burn the atomized fuel oil mixture. The carburetor can automatically prepare mixed gas with corresponding concentration according to the requirements of different working states of the engine, and outputs the mixed gas with corresponding amount for the combustion of the engine to do work.

Carburetors are generally divided into plunger carburetors and guillotine carburetors, both of which have a common disadvantage in that, below the full throttle opening, a turbulent gas flow occurs inside the carburetor throat, which is particularly severe when the throttle is below one-half of the opening, which results in a poor fuel pick-up capability and poor fuel atomization, and thus tends to cause insufficient engine power.

SUMMERY OF THE UTILITY MODEL

Therefore, the throttle valve structure and the carburetor need to be provided aiming at the problems that the throttle valve position of the carburetor generates gas turbulence, the fuel oil atomization effect is poor and the engine power is insufficient.

The utility model provides a throttle structure, include:

the shell is provided with an air inlet channel in a penetrating way along the axial direction;

the throttle valve is movably connected to the shell and provided with a first guide surface, the first guide surface and the axial direction of the air inlet channel are arranged at an acute angle, and the radial size of the first guide surface is gradually reduced in the air inlet direction of the air inlet channel; the throttle valve is movable relative to the housing to adjust the area of the first guide surface in the intake passage.

The throttle valve structure can be used for a carburetor, the carburetor can suck external air through the air inlet channel of the shell under the negative pressure state, the air can drive fuel oil to enter the air inlet channel in the flowing process, the fuel oil and the air are mixed and then enter the combustion chamber together for combustion, and power is provided for an engine of a motor vehicle. The first guide surface of throttle valve and inlet channel's axial are the acute angle and arrange, and in inlet channel's direction of admission, the radial dimension of first guide surface diminishes progressively, and the first guide surface that sets up like this has the air current guide effect to the gaseous torrent phenomenon that the weakening air current produced at inlet channel, makes the air current pick up the ability reinforce of fuel, and the atomizing of fuel is effectual, can provide sufficient power for the engine after the fuel burning.

In one embodiment, the throttle valve is slidably connected to the housing, and a sliding direction of the throttle valve is perpendicular to an axial direction of the intake passage.

In one embodiment, sliding grooves are formed in two sides of the throttle valve, sliding rails are arranged on two sides of the shell, and the sliding rails are in sliding clamping connection with the sliding grooves.

In one embodiment, the first guide surface is an arc surface, and the radian of the first guide surface is 1 radian-2 radians.

In one embodiment, the first guide surface is a cambered surface, and the area of the first guide surface decreases in the air intake direction of the air intake passage.

In one embodiment, the throttle valve further has a second guide surface that is engaged with the first guide surface, the second guide surface having a decreasing radial dimension in an intake direction of the intake passage.

In one embodiment, the second guide surface is an arc surface, and the arc of the second guide surface is 1-2 arc.

In one embodiment, the housing comprises a first body and a second body which are connected with each other, the throttle valve is movably connected with the second body, and the radial size of the first body is decreased gradually in the air intake direction of the air intake passage.

In one embodiment, the inner wall of the second body comprises a first cambered surface and a second cambered surface, the first cambered surface and the second cambered surface are in smooth transition, and the diameter of the second cambered surface is smaller than that of the first cambered surface.

The utility model also provides a carburetor, including foretell throttle valve structure.

Drawings

FIG. 1 is a schematic view of a carburetor according to the present invention with an existing throttle valve open;

FIG. 2 is a schematic structural diagram of the throttle valve of the present invention;

FIG. 3 is a schematic structural view of the throttle structure of the present invention;

FIG. 4 is a schematic view of the disassembled structure of the throttle valve structure of the present invention;

fig. 5 is a schematic view of the longitudinal section structure of the airflow channel of the second body of the present invention.

In the drawings, the reference numbers indicate the following list of parts:

100. a carburetor;

1. a throttle structure; 11. a housing; 111. an air intake passage; 112. a first housing; 1121. a through hole; 1122. a first body; 1123. a second body; 1124. a first arc surface; 1125. a second arc surface; 113. a second housing; 1131. a screw hole; 114. a middleware; 1141. a slide rail; 12. a gas throttle; 121. a first guide surface; 122. a second guide surface; 123. a chute;

2. a float chamber;

3. an oil outlet channel.

Detailed Description

In order to make the above objects, features and advantages of the present invention more comprehensible, embodiments of the present invention are described in detail below with reference to the accompanying drawings. It is to be understood that the specific details described below are merely exemplary of some embodiments of the invention, and that the invention is capable of other embodiments than those described herein. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work all belong to the protection scope of the present invention.

It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Referring to fig. 1, the present invention provides a carburetor 100, the carburetor 100 is used for mixing fuel and air, and delivering the mixture to a combustion chamber for combustion to drive an engine to do work, and the engine drives a motor vehicle to run, the motor vehicle can be a motorcycle, etc.

Under the negative pressure of the carburetor 100, the flow velocity of the air flowing into the throat of the carburetor 100 is high, so that sufficient power can be provided for the flowing of the fuel, more fuel is driven to be mixed with the air flow, the mixed mixture contains more fuel, and the mixture can provide sufficient power for the engine after being combusted.

Referring to fig. 1, a carburetor 100 includes a throttle valve structure 1, a float chamber 2, and an oil outlet passage 3, the throttle valve structure 1 includes an air inlet passage 111, the air inlet passage 111 communicates with one end of the oil outlet passage 3, and the other end of the oil outlet passage 3 communicates with the float chamber 2, so that fuel in the float chamber 2 can flow to the air inlet passage 111 through the oil outlet passage 3 to be mixed with air flow in the air inlet passage 111.

The carburetor 100 is capable of creating a negative pressure in the intake passage 111 driven by the engine piston movement to allow external air to enter the intake passage 111 to create a flowing air stream. The flowing air flow drives the oil outlet channel 3 to form negative pressure to drive the fuel oil in the float chamber 2 to flow to the air inlet channel 111, and the fuel oil is mixed with the air flow in the air inlet channel 111 to form a mixture, which can be understood as fuel oil atomization. The mixture is combusted in the combustion chamber of the engine through the carburetor 100, so that the engine works to provide power, and the motorcycle is driven to run.

The throttle valve structure 1 comprises a housing 11 and a throttle valve 12, wherein the throttle valve 12 is movably connected to the housing 11.

The housing 11 has the above-described intake passage 111 opened along the axial direction thereof, and the intake passage 111 penetrates the housing 11. The axial direction of the housing 11 is a direction parallel to the central axis of the housing 11, and may be understood as a flow direction of the gas flow.

The throttle valve 12 is slidable up and down relative to the housing 11 under the control of the carburetor 100 to adjust the open area of the intake passage 111. When the air throttle 12 is completely separated from the intake passage 111, the clear area is equal to the longitudinal cross-sectional area of the intake passage 111, and the air throttle 12 does not shield the intake passage 111. When the throttle valve 12 completely blocks the intake passage 111, the open area is zero, and at this time, the external air cannot be mixed with the fuel and enter the combustion chamber. The driver can control the air throttle 12 to slide relative to the shell 11 according to the actual condition of the motorcycle, and then adjust the unblocked area of the air inlet channel 111, so that the volume of the fuel-air flow mixture finally entering the combustion chamber is proper, and the mixture can be sufficiently combusted to provide enough power for the motorcycle.

The sliding direction of the throttle valve 12 is perpendicular to the axial direction of the intake passage 111, but in other embodiments, the sliding direction of the throttle valve 12 may be arranged at other angles to the axial direction of the intake passage 111, such as 60 ° or 45 °, for example, and is not limited thereto. In other embodiments, the air throttle 12 and the housing 11 may be movably connected, such as rotatably connected, and the rotation of the air throttle 12 relative to the housing 11 may also adjust the open area of the air intake passage 111.

The throttle valve 12 of the embodiment shown in fig. 1 is of a conventional structure, and as can be seen from fig. 1, the side wall of the throttle valve 12 and the inner wall of the intake passage 111 are perpendicular to each other, or even at an acute angle. The bottom end of the throttle valve 12 is located at approximately the central axis of the intake passage 111, i.e., the clear area of the intake passage 111 is approximately half the longitudinal sectional area of the intake passage 111. At this time, external air continues to flow into the intake passage 111 by the negative pressure of the carburetor 100, and a gas turbulence phenomenon (refer to part a in fig. 1) occurs between the side wall of the throttle valve 12 and the inner wall of the intake passage 111, resulting in a blockage of a part of the air flow through the intake passage 111 at the bottom of the throttle valve 12.

The bottom of the throttle valve 12 is opposite to the oil outlet channel 3, and the air flow passing through the bottom of the throttle valve 12 forms negative pressure on the oil outlet channel 3 to suck fuel oil in the float chamber 2. Since the turbulent flow of gas weakens the flow rate of the gas flowing through the fuel outlet passage 3, resulting in insufficient power for sucking the fuel, the amount of the fuel flowing out of the fuel outlet passage 3 is reduced, and the mixture formed after the fuel and the gas flow are mixed contains a low content of the fuel, and cannot provide sufficient power after combustion in the combustion chamber.

Therefore, the utility model discloses the structure to throttle valve 12 is improved to alleviate the problem of gas torrent.

Referring to fig. 2, fig. 2 shows a modified structure of the throttle valve 12, wherein the throttle valve 12 has a first guide surface 121 and a second guide surface 122, and the first guide surface 121 and the second guide surface 122 are in transition with each other.

The first guide surface 121 is an arc surface, and the arc of the arc surface is not limited, and may be, for example, 1 to 2 arcs, and the arc of the first guide surface 121 of the embodiment shown in fig. 2 is 1 arc, but may be other arcs, and is not limited herein.

In the air intake direction of the air intake channel 111, the first guide surface 121 is arranged at an acute angle (greater than 0 ° and less than 90 °) to the axial direction of the air intake channel 111, and the radial dimension of the first guide surface 121 decreases, so that the guiding action of the airflow flowing through the first guide surface 121 by the first guide surface 121 does not form strong gas turbulence. The radial dimension of the first guide surface 121 is the distance between the first guide surface 121 and the central axis of the intake passage 111. In addition, in the air inlet direction of the air inlet channel 111, the area of the first guide surface 121 is decreased progressively, which is more beneficial to relieving the gas turbulence.

Referring to fig. 2, the second guide surface 122 is connected to the end of the first guide surface 121 with the smallest radial dimension, and the second guide surface 122 is also an arc surface, and the arc degree of the arc surface is not limited, for example, it may be 1 arc degree to 2 arc degrees, and the arc degree of the second guide surface 122 of the embodiment shown in fig. 2 is 1.2 arc degrees, of course, it may also be other arc degrees, and it is not limited herein.

In addition, the radial dimension of the second guide surface 122 decreases in the intake direction of the intake passage 111.

The airflow entering the airflow channel 111 sequentially flows through the first guide surface 121 and the second guide surface 122, because the radial sizes of the first guide surface 121 and the second guide surface 122 are decreased gradually in the air inlet direction of the air inlet channel 111, the airflow can smoothly pass through the first guide surface 121 and the second guide surface 122, the influence of the throttle valve 12 on the airflow is small, the flow speed of the airflow flowing through the oil outlet channel 3 is high, high negative pressure can be formed on the oil outlet channel 3 to drive more fuel to be sprayed out from the oil outlet channel 3, the mixture mixed with the airflow contains more fuel, and the mixture can provide high power for an engine after flowing into a combustion chamber for combustion.

The carburetor 100 can control the throttle valve 12 to slide up and down relative to the housing 11 to adjust the areas of the first guide surface 121 and the second guide surface 122 in the intake passage 111. In a preferred state, the first guide surface 121 of the throttle valve 12 is located just completely in the air inlet passage 111, and the vertical side wall of the throttle valve 12 is not located in the air inlet passage 111, so that the air flow flowing through the air inlet passage 111 does not substantially form air turbulence on the throttle valve 12, the air flow flowing through the oil outlet passage 3 has a greater flow speed, the power for sucking the fuel is greater, more fuel can be sucked and mixed with the air flow, and the engine can be provided with more power after combustion.

The sliding grooves 123 are formed on two sides of the throttle valve 12, and the sliding grooves 123 are used for being in sliding connection with the housing 11, so that the throttle valve 12 can slide up and down relative to the housing 11 to adjust the smooth area of the air inlet channel 111.

Referring to fig. 3 and 4, the housing 11 includes a first shell 112, a second shell 113, and an intermediate member 114, wherein the intermediate member 114 is disposed between the first shell 112 and the second shell 113, and the first shell 112 is connected to the second shell 113 to clamp and fix the intermediate member 114.

The middle part 114 has slide rails 1141 on both sides of the inside thereof, and the slide rails 1141 are slidably engaged with the slide grooves 123 of the throttle valve 12, so that the throttle valve 12 can slide on the slide rails 1141 of the middle part 114.

The first housing 112 has a through hole 1121, the second housing 113 has a screw hole, and a screw can be threaded through the through hole 1121 to connect to the screw hole, so as to connect the first housing 112 and the second housing 113.

The first housing 112 includes a first body 1122 and a second body 1123 connected to each other, and the first body 1122 and the second body 1123 are integrally formed. In the air intake direction of the air intake passage 111, the first body 1122 has a decreasing radial size and a shape close to the bell mouth.

Referring to fig. 5, the inner wall of the second body 1123 includes a first arc surface 1124 and a second arc surface 1125, and the diameter of the second arc surface 1125 is smaller than that of the first arc surface 1124. The throttle valve 12 passes through the second cambered surface 1125 with a smaller diameter and then passes through the first cambered surface 1124 with a larger diameter in the process of gradually opening the air intake passage 111. When the engine is in a low-speed state, the throttle valve 12 firstly passes through the second cambered surface 1125, the unblocked area of the airflow channel 111 is not changed greatly, the negative pressure of the air inlet channel 111 cannot be reduced quickly, the pressure difference of the air inlet of the airflow channel 111 is large, so that the airflow velocity entering the airflow channel 111 is large, the atomization effect on fuel oil is good, and sufficient power can be provided for the engine even in the low-speed state of the engine.

The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above embodiments only represent several embodiments of the present invention, and the description thereof is specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several changes, substitutions and improvements can be made, and all of them should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the claims.

Claims

1. A throttle valve structure, characterized by comprising:

the shell is provided with an air inlet channel along the axial direction in a penetrating way;

2. A throttle valve structure as set forth in claim 1, characterized in that the throttle valve is slidably attached to the housing with a sliding direction of the throttle valve perpendicular to an axial direction of the intake passage.

3. The throttle structure of claim 2, wherein the throttle body has sliding grooves on both sides thereof, and the housing has sliding rails on both sides thereof, and the sliding rails are slidably engaged with the sliding grooves.

4. The throttle structure of claim 1, wherein the first guide surface is an arc surface, and the arc of the first guide surface is 1 arc to 2 arc.

5. A throttle valve structure as set forth in claim 1, characterized in that the first guide surface is a curved surface whose area decreases in the intake direction of the intake passage.

6. A throttle valve structure as set forth in claim 5, characterized in that the throttle valve further has a second guide surface that engages with the first guide surface, the second guide surface decreasing in radial dimension in the intake direction of the intake passage.

7. The throttle structure of claim 6, wherein the second guide surface is an arc surface, and the arc of the second guide surface is 1 arc to 2 arc.

8. A throttle valve structure as set forth in any one of claims 1-7, characterized in that the housing includes a first body and a second body connected to each other, the first body having a radial dimension that decreases in an intake direction of the intake passage.

9. The throttle structure of claim 8, wherein the inner wall of the second body includes a first cambered surface and a second cambered surface, the first cambered surface and the second cambered surface are in smooth transition, and the diameter of the second cambered surface is smaller than that of the first cambered surface.

10. A carburetor according to any one of claims 1 to 9, comprising a throttle valve structure according to any one of claims 1 to 9.