CN217926098U

CN217926098U - Fuel oil negative pressure switch

Info

Publication number: CN217926098U
Application number: CN202222089332.4U
Authority: CN
Inventors: 谢军; 何小梅
Original assignee: Chongqing Fenwei Machinery Manufacturing Co ltd
Current assignee: Chongqing Fenwei Machinery Manufacturing Co ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2022-11-29
Anticipated expiration: 2032-08-09

Abstract

The utility model discloses a fuel negative pressure switch. The fuel oil negative pressure switch comprises a negative pressure switch body and a manual switch assembly, the manual switch assembly comprises a pressing cap, a push rod and a manual reset spring, a mounting hole is formed in the negative pressure switch body, the push rod is arranged in the mounting hole in the negative pressure switch body, the push rod is used for pushing a diaphragm of the negative pressure switch body, the pressing cap is arranged on the push rod, two ends of the manual reset spring are respectively connected with the pressing cap and the negative pressure switch body, the manual reset spring is used for resetting the pressing cap, and the pressing cap drives the push rod to reset. The utility model discloses fuel negative pressure switch can manually be opened.

Description

Fuel oil negative pressure switch

Technical Field

The utility model relates to the technical field of engines, especially, relate to a fuel negative pressure switch.

Background

When the engine of the small generator, the water pump, the cleaning machine, the handheld electric saw or the mower is in a working state, negative pressure is generated in the combustion chamber, and the fuel oil negative pressure switch can be opened under the action of the negative pressure, so that fuel oil flows into the carburetor float chamber. After the fuel oil negative pressure switch is used for a long time, the fuel oil negative pressure switch can not be opened or can not be opened completely when the engine is started, namely, the diaphragm always blocks the oil outlet of the oil inlet channel or only opens a small opening, and the fuel oil negative pressure switch can not be opened manually, so that the engine can not be started or is difficult to start.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to provide a can manually open fuel negative pressure switch of diaphragm.

In order to solve the problem, the utility model provides a fuel negative pressure switch, fuel negative pressure switch includes negative pressure switch body and manual switch subassembly, the manual switch subassembly is including pressing cap, push rod and manual reset spring, be equipped with the mounting hole on the negative pressure switch body, the push rod is established mounting hole on the negative pressure switch body, the push rod is used for promoting the diaphragm of negative pressure switch body, press and establish on the cap on the push rod, manual reset spring's both ends respectively with press cap and this body coupling of negative pressure switch, manual reset spring is used for reseing and presses the cap, it drives the push rod and resets to press the cap.

Further, the press cap also serves as a member which comes into contact with a person when pressed.

Further, the pressure cap is positioned at the upper end of the pressure rod.

Furthermore, the push rod is provided with a convex ring for preventing dropping and a sealing ring for sealing the mounting hole.

Furthermore, the number of the convex rings is two, the two convex rings are arranged at intervals, and the sealing ring is arranged between the two convex rings.

Further, the negative pressure switch body includes shell, diaphragm, isolation reset spring and butt dish, the shell has the installation cavity, the diaphragm is established in the installation cavity of shell, the butt dish is fixed on the diaphragm, it is used for the diaphragm that resets to keep apart reset spring, be provided with oil feed passageway, the passageway of producing oil and negative pressure passageway on the shell, oil feed passageway, the passageway of producing oil and negative pressure passageway all with the installation cavity intercommunication, the diaphragm is used for shutoff oil feed passageway.

Further, the shell includes go up the casing and the casing down, go up the casing with the casing joint is fixed down, the mounting hole the oil feed passageway all establishes with the passageway of producing oil on the epitheca, the negative pressure passageway is established on the casing down, the oil feed passageway is located one side of diaphragm with the passageway of producing oil, the negative pressure passageway is located the opposite side of diaphragm.

Furthermore, go up joint hole on the casing, be provided with the joint arch down on the casing, the protruding joint of joint is in the joint is downthehole.

Furthermore, be equipped with the joint inclined plane of guide casing joint down on the last casing, the joint inclined plane with the joint hole corresponds the setting, the bellied top surface of joint is the inclined plane, the bellied bottom surface of joint is the plane, the bellied top surface of joint with the cooperation of joint inclined plane.

Furthermore, the side wall of the upper shell extends outwards to form an installation block, a lightening hole and a fixing hole are formed in the installation block, the lightening hole is used for lightening the weight of the installation block, and the fixing hole is used for installing the shell.

The utility model discloses you use the push rod to promote the diaphragm with the fuel negative pressure switch, make diaphragm and oil feed passageway separation to let the fuel flow from an oil channel, the engine start of can being convenient for still can start the engine when negative pressure switch is malfunctioning, can ensure that the engine start is smooth and easy, improve user's experience and feel.

Drawings

Fig. 1 is a schematic structural diagram of a preferred embodiment of the fuel oil negative pressure switch of the present invention.

Fig. 2 is a sectional view of the fuel negative pressure switch of the present invention.

Fig. 3 is a schematic structural view of the upper case.

Fig. 4 is a schematic structural view of the lower case.

Fig. 5 is a schematic view of the structure of the diaphragm.

Fig. 6 is a schematic view of the structure of the abutment plate.

Fig. 7 is a partially enlarged view of a in fig. 2.

Negative pressure switch body 100, manual switch subassembly 200, shell 1, installation cavity 10, go up casing 11, oil feed passageway 111, oil outlet channel 112, mounting hole 113, joint hole 114, installation piece 115, lightening hole 1151, fixed orifices 1152, joint inclined plane 116, constant head tank 117, lower casing 12, negative pressure passageway 121, butt platform 122, spacing platform 123, spacing ring 124, joint arch 125, strengthening rib 126, diaphragm 2, diaphragm 21, spliced pole 22, anticreep cap 221, bulge loop 23, keep apart reset spring 3, butt dish 4, spacing groove 41, pressure cap 5, push rod 6, bulge loop 61, sealing washer 62, manual reset spring 7.

Detailed Description

The present invention will be further explained with reference to the accompanying drawings.

As shown in fig. 1, the fuel oil negative pressure switch of the present invention includes a negative pressure switch body 100 and a manual switch assembly 200, wherein the manual switch assembly 200 is disposed on the negative pressure switch body 100, and the manual switch assembly 200 is used for manually opening the negative pressure switch body 100.

As shown in fig. 2 to 4, the negative pressure switch body 100 includes a housing 1, a diaphragm 2, an isolation return spring 3 and a contact disc 4, the housing 1 has an installation cavity 10, an outer edge of the diaphragm 2 is fixed on the housing 1, the diaphragm 2 is located in the installation cavity 10, the contact disc 4 is fixed on the diaphragm 2, one end of the isolation return spring 3 abuts on the housing 1, the other end of the isolation return spring 3 abuts on the contact disc 4, the housing 1 is provided with an oil inlet channel 111, an oil outlet channel 112 and a negative pressure channel 121, the oil inlet channel 111, the oil outlet channel 112 and the negative pressure channel 121 are all communicated with the installation cavity 10, the diaphragm 2 is used for blocking the oil inlet channel 111, and disconnecting the oil inlet channel 111 and the oil outlet channel 112, fuel cannot enter the installation cavity 10 from the oil inlet channel 111, fuel cannot be discharged from the oil outlet channel 112, the negative pressure channel 121 is communicated with a combustion chamber of an engine through a pipeline, and negative pressure generated by the engine separates the diaphragm 2 from the oil inlet channel 111, so that the oil inlet channel 111 and the oil outlet channel 112 can be discharged from the installation cavity 112.

The shell 1 includes go up casing 11 and lower casing 12, go up casing 11 with casing 12 joint is fixed down, go up casing 11 and casing 12 fixed formation installation cavity 10 down, the outer edge of diaphragm 2 is fixed by last casing 11 and lower casing 12 centre gripping, the one end butt of keeping apart reset spring 3 is in on the casing 12 down, the other end butt of keeping apart reset spring 3 is in on the butt dish 4. The oil inlet channel 111 and the oil outlet channel 112 are both arranged on the upper shell, an oil outlet of the oil inlet channel 111 faces the lower shell 12, an oil outlet of the oil inlet channel 111 is in a horn shape, namely the diameter of the oil outlet is large at the bottom and small at the top, the oil inlet channel 111 and the oil outlet channel 112 are located above the diaphragm 2, the negative pressure channel 121 is arranged on the lower shell 12, and the negative pressure channel 121 is located below the diaphragm 2.

The upper shell 11 is provided with a mounting hole 113 and a clamping hole 114, the mounting hole 113 is used for mounting the manual switch assembly 200, and the mounting hole 113 is communicated with an oil outlet of the oil inlet channel 111; casing 12 under joint hole 114 is used for the joint, joint hole 114 is established on the lateral wall of casing 11, just joint hole 114 runs through the lateral wall of casing 11, joint hole 114 is four, joint hole 114 evenly distributed is in go up the lateral wall of casing 11, it accepts evenly to ensure casing 12 joint last casing 11 when last casing 11 down, the quantity in joint hole 114 is not restricted to four, can set up according to actual demand. When the engine does not generate negative pressure, the diaphragm 2 blocks the oil outlet of the oil inlet passage 111 under the action of the isolation return spring 3, and the manual switch assembly 200 can push the diaphragm 2 after passing through the oil outlet so as to relieve the blocking of the diaphragm 2 on the oil outlet of the oil inlet passage 111. The side wall of the upper shell 11 extends outwards to form a mounting block 115, a lightening hole 1151 and a fixing hole 1152 are arranged on the mounting block 115, the lightening hole 1151 is used for lightening the weight of the mounting block 115, the fixing hole 1152 is used for mounting the shell, and the fixing hole 1152 is located outside the side wall. Be equipped with constant head tank 117 on the terminal surface of going up casing 11 and lower casing 12 contact, diaphragm 2 card is established in constant head tank 117, can inject diaphragm 2, ensures that diaphragm 2 is difficult for droing. Go up the inner wall of casing 11 and be equipped with the joint inclined plane 116 of casing 12 joint under the guide, joint inclined plane 116 with joint hole 114 corresponds the setting, and a joint inclined plane 116 corresponds and sets up a joint hole 114 promptly, and joint inclined plane 116 is located the below in joint hole 114.

An abutting platform 122 and a limiting platform 123 are arranged on the inner wall of the lower shell 12. The butt platform 122 is used for butt to keep apart reset spring 3, be equipped with spacing ring 124 on the butt platform 122, the spacing ring 124 is used for the restriction to keep apart reset spring 3, prevents to keep apart reset spring 3 and rocks the aversion. The limiting platform 123 is used for limiting the abutting disc 4 and preventing the abutting disc 4 from pulling the diaphragm 2 to cause the diaphragm 2 to be excessively stretched and deformed and damaged. The outer wall of the lower shell 12 is provided with a clamping protrusion 125 and a reinforcing rib 126. The clamping protrusion 125 is used to cooperate with the clamping hole 114, that is, the clamping protrusion 125 is inserted into the clamping hole 114, so that the lower housing 12 can be fixed on the upper housing 11. The protruding 125's of joint top surface is the inclined plane, the protruding 125's of joint bottom surface is the plane, the protruding 125's of joint top surface with joint inclined plane 116 cooperation, can be more convenient insert joint hole 114 with the protruding 125 of joint in, the protruding 125's of joint ground is the plane simultaneously, and the effectual protruding 125 of joint that prevents is deviate from in the joint hole 114. The ribs 126 serve to increase the strength of the lower case 12, making the lower case 12 more durable.

As shown in fig. 5, the diaphragm 2 includes a diaphragm 21, a connection column 22 and a convex ring 6123, the convex ring 6123 is located at the outer edge of the diaphragm 21, the connection column 22 is disposed on the diaphragm 21, the connection column 22 is located at the center of the diaphragm 2, the connection column 22 is used for being connected with the abutting disk 4, and the end of the connection column 22 is provided with an anti-falling cap 221 to ensure that the connection column 22 does not fall off from the abutting disk 4.

As shown in fig. 6, a limiting groove 41 is disposed on the abutting disc 4, and the limiting groove 41 is used for limiting the isolation return spring 3 and preventing the isolation return spring 3 from being out of order when the isolation return spring 3 is shifted and inverted.

Referring to fig. 2 and 7, the manual switch assembly 200 includes a press cap 5, a push rod 6, and a manual return spring 7. The push rod 6 penetrates through the mounting hole 113 of the upper shell 11, the push rod 6 is fixed with the pressing cap 5 through a lock pin, the diameter of the pressing cap 5 is larger than that of the push rod 6, and the pressing cap 5 is used for limiting the manual reset spring 7; the pressing cap 5 is used as a part which is contacted with a person during pressing, so that the contact area during pressing can be increased, and the pressing is convenient; the pressing cap 5 is positioned at the upper end of the pressing rod, and further pressing is facilitated. One end of the manual return spring 7 abuts against the upper housing 11, and the other end of the manual return spring 7 abuts against the pressure cap 5. Pressing the pressing cap 5, pushing the push rod 6 downwards to enable the push rod 6 to push the diaphragm 2 so as to remove the blockage of the diaphragm 2 on the oil inlet channel 111, and smoothly starting the engine. In other embodiments, the pressing cap 5 can also be connected with the push rod 6 by screwing or welding; of course, the position of the pressing cap 5 can be changed, such as being arranged in the middle of the push rod 6, and the like, without being limited to the upper end; it should be noted that, if the pressing cap 5 is not provided at the upper end of the push rod 6, the push rod 6 may be directly pressed during pressing, or the pressing cap 5 may be pressed, and the pressing object may be selected according to actual conditions.

The push rod 6 is provided with two convex rings 6123 and sealing rings 62, the two convex rings 6123 are arranged at intervals, an installation space is formed between the two convex rings 6123, one sealing ring 62 is installed in the installation space, namely one sealing ring 62 is located between the two convex rings 6123, the other sealing ring 62 is sleeved on the push rod 6 and located between the convex rings 6123 and the upper shell 11, and the sealing rings 62 are used for sealing the installation holes 113, so that safety accidents caused by fuel leakage are prevented, and the safety of a user is effectively guaranteed. The collar 6123 also serves as an anti-drop member to prevent the push rod 6 from dropping out of the mounting hole 113. In other embodiments, the push rod 6 may also be provided with a groove-mounted sealing ring 62, or only one protruding ring 6123, and it should be understood that the number of the sealing rings 62 may be set according to actual requirements.

When the engine starts, when diaphragm 2 can't separate with oil feed passageway 111, press and press cap 5, press cap 5 and promote push rod 6, push rod 6 promotes diaphragm 2, makes diaphragm 2 and oil feed passageway 111 separate to let the fuel flow from oil outlet passageway 112, can make things convenient for the engine to start, still can start the engine when negative pressure switch is out of order, ensure that the engine starts smoothly.

The above is only the embodiment of the present invention, not the limitation of the patent scope of the present invention, all the equivalent structures made by the contents of the specification and the drawings are directly or indirectly applied to other related technical fields, all the same principle is within the patent protection scope of the present invention.

Claims

1. A fuel oil negative pressure switch is characterized in that: including negative pressure switch body and manual switch subassembly, the manual switch subassembly is including pressing cap, push rod and manual reset spring, be equipped with the mounting hole on the negative pressure switch body, the push rod is established mounting hole on the negative pressure switch body, the push rod is used for promoting the diaphragm of negative pressure switch body, it establishes on the pressure cap on the push rod, manual reset spring's both ends respectively with press cap and this body coupling of negative pressure switch, manual reset spring is used for reseing and presses the cap, it resets to press the cap to drive the push rod.

2. The fuel oil negative pressure switch of claim 1, characterized in that: the press cap also serves as a means for contacting a person when pressed.

3. The negative pressure fuel switch of claim 1, wherein: the pressure cap is positioned at the upper end of the pressure rod.

4. The negative pressure fuel switch of claim 1, wherein: the push rod is provided with a convex ring for preventing falling and a sealing ring for sealing the mounting hole.

5. The negative pressure fuel switch of claim 4, characterized in that: the number of the convex rings is two, the two convex rings are arranged at intervals, and the sealing ring is arranged between the two convex rings.

6. The negative pressure fuel switch according to any one of claims 1 to 5, characterized in that: the negative pressure switch body includes shell, diaphragm, isolation reset spring and butt flange, the shell has the installation cavity, the diaphragm is established in the installation cavity of shell, the butt flange is fixed on the diaphragm, it is used for the diaphragm that resets to keep apart reset spring, be provided with oil feed passageway, the passageway of producing oil and negative pressure passageway on the shell, oil feed passageway, the passageway of producing oil and negative pressure passageway all with the installation cavity intercommunication, the diaphragm is used for the shutoff oil feed passageway.

7. The negative pressure fuel switch of claim 6, wherein: the shell includes casing and lower casing, go up the casing with the casing joint is fixed down, the mounting hole the oil feed passageway is all established with the passageway that produces oil on the epitheca, the negative pressure passageway is established on the casing down, the oil feed passageway is located one side of diaphragm with the passageway that produces oil, the negative pressure passageway is located the opposite side of diaphragm.

8. The negative pressure fuel switch of claim 7, wherein: the upper shell is provided with a clamping hole, the lower shell is provided with a clamping protrusion, and the clamping protrusion is clamped in the clamping hole.

9. The fuel oil negative pressure switch of claim 8, characterized in that: the upper shell is provided with a clamping inclined plane for guiding the clamping of the lower shell, the clamping inclined plane corresponds to the clamping hole, the top surface of the clamping bulge is an inclined plane, the bottom surface of the clamping bulge is a plane, and the top surface of the clamping bulge is matched with the clamping inclined plane.

10. The negative pressure fuel switch of claim 7, wherein: the side wall of the upper shell extends outwards to form an installation block, the installation block is provided with lightening holes and fixing holes, the lightening holes are used for lightening the weight of the installation block, and the fixing holes are used for installing the shell.