CN214533289U

CN214533289U - High-temperature-resistant self-circulation device

Info

Publication number: CN214533289U
Application number: CN202121011430.5U
Authority: CN
Inventors: 侯明君
Original assignee: Fujian Dali General Electromechanical Manufacturing Co ltd
Current assignee: Fujian Dali General Electromechanical Manufacturing Co ltd
Priority date: 2021-05-12
Filing date: 2021-05-12
Publication date: 2021-10-29
Anticipated expiration: 2031-05-12

Abstract

The invention belongs to the technical field of gasoline engines, and relates to a high-temperature-resistant self-circulation device which comprises a body part, a middle lower body part and a lower cover part, wherein the body part comprises a body, a negative pressure hole is formed in the body, a negative pressure cavity is formed in the body, a main oil outlet hole is formed in the body, an idle speed oil outlet hole is formed in the body, a third transition hole is formed in the body, a second transition hole is formed in the body, and a first transition hole is formed in the body. The high-temperature-resistant self-circulation device has the advantages that the membrane type design structure is adopted, the original float type structure is abandoned, the negative pressure oil inlet mode is adopted in the oil inlet mode, the forced oil inlet condition of the float type structure caused by the change of oil pressure can be effectively avoided, the oil leakage phenomenon caused by rich oil is also avoided, and the high-temperature-resistant self-circulation device has high safety and controllability.

Description

High-temperature-resistant self-circulation device

Technical Field

The invention belongs to the technical field of gasoline engines, and particularly relates to a high-temperature-resistant self-circulation device.

Background

In recent years, the requirement of various major host factories on the safety performance of a general gasoline engine is higher and higher, a traditional general small gasoline engine carburetor adopts a float type structure, an oil inlet system of the structure is a dynamic balance system, a float drives a needle valve to continuously adjust a gap between the needle valve and a valve seat under the action of the buoyancy of gasoline in a float chamber to control the oil inlet amount, so that the oil surface in the float chamber of the engine keeps dynamic stability under various working conditions, the oil level of the carburetor with the structure fluctuates under the severe working environment, and serious oil leakage phenomenon easily occurs, the oil leakage phenomenon is caused by the fact that the balance system is damaged, the oil leakage of the carburetor not only increases the oil consumption and influences the performance of the whole engine, but also more importantly, the safety of the engine is greatly damaged.

Disclosure of Invention

To solve the problems set forth in the background art described above. The invention provides a high-temperature-resistant self-circulation device, which solves the technical problem that the oil level is unstable and serious oil leakage is easy to occur.

In order to achieve the purpose, the invention provides the following technical scheme: a high-temperature-resistant self-circulation device comprises a body component, a middle and lower body component and a lower cover component, wherein the body component comprises a body, a negative pressure hole is formed in the body, a negative pressure cavity is formed in the body, a main oil outlet hole is formed in the body, an idling oil outlet hole is formed in the body, a third transition hole is formed in the body, a second transition hole is formed in the body, a first transition hole is formed in the body, a negative pressure pipe is arranged in the body in a penetrating mode, a main metering orifice is formed in the body, a sealing ring is arranged in the body, a main nozzle component is fixedly connected in the body, the middle and lower body component is arranged at the bottom end of the body component and comprises a lower body, an air chamber is arranged in the lower body, a middle and lower body air inlet hole is formed in the lower body, the inside of the lower part of the body is provided with lower part of the body oil storage chamber, the lower surface of the lower part of the body is provided with the pump cover gasket, the lower surface of pump cover gasket is provided with the pump cover diaphragm, the lower surface of pump cover diaphragm is provided with the pump cover, lower cover part sets up the bottom of the body part of the middle and lower parts of the body, lower cover part includes the negative pressure pump cover, negative pressure pump cover negative pressure chamber has been seted up to the inside of negative pressure pump cover, the side of negative pressure pump cover is provided with the pagoda spring, the side of pagoda spring is provided with negative pressure pump cover gasket, the side of negative pressure pump cover gasket is provided with negative pressure pump cover diaphragm.

As a further scheme of the invention: the novel air-conditioning device is characterized in that a body air inlet is formed in the body, the body air inlet is formed in the top end of the main nozzle component, an idle speed measuring hole is formed in the body, a throttle valve is arranged in the body, and a negative pressure rubber tube is sleeved on the surface of the negative pressure tube.

As a further scheme of the invention: the pump cover diaphragm is characterized in that a pump cover diaphragm oil inlet check valve and a pump cover diaphragm oil outlet check valve are arranged inside the pump cover diaphragm, a pump cover oil cavity is formed inside the pump cover, a pump cover air inlet hole is formed inside the pump cover, and a pump cover fuel oil cavity is formed inside the pump cover.

As a further scheme of the invention: the metering pump is characterized in that a pump cover oil storage cavity is formed in the pump cover, a metering chamber gasket is arranged on the lower surface of the pump cover, a needle valve diaphragm component is arranged on the lower surface of the metering chamber gasket, and a metering chamber connecting cover is arranged on the lower surface of the needle valve diaphragm component.

As a further scheme of the invention: the measuring chamber is characterized in that a measuring chamber cavity is formed in the measuring chamber connecting cover, a measuring chamber cover pressing plate is sleeved on the surface of the measuring chamber connecting cover, an oil inlet pipe is arranged in the lower body in a penetrating mode, and an oil inlet bent pipe is arranged in the lower body in a penetrating mode.

As a further scheme of the invention: the inside of the lower part of the body is provided with the needle valve, the inside of the lower part of the body is provided with the needle valve spring, the inside of the lower part of the body is provided with the needle valve rocking arm, the inside of the lower part of the body is provided with pump membrane return tower spring.

As a further scheme of the invention: the negative pressure pump cover diaphragm oil inlet check valve and the negative pressure pump cover diaphragm oil outlet check valve are arranged inside the negative pressure pump cover diaphragm, a lower cover is arranged on the side face of the negative pressure pump cover, a lower cover oil inlet hole is formed in the lower cover, a lower cover fuel oil cavity is formed in the lower cover, and a lower cover oil storage cavity is formed in the lower cover.

As a further scheme of the invention: an oil drainage screw is arranged in the lower cover in a penetrating mode, an oil drainage pipe is arranged in the lower cover in a penetrating mode, an oil outlet pipe is arranged in the lower cover in a penetrating mode, a negative pressure branch pipe is arranged in the lower cover in a penetrating mode, and the other end of the negative pressure branch pipe is arranged in the negative pressure rubber pipe in a penetrating mode.

Compared with the prior art, the invention has the beneficial effects that:

1. this high temperature resistant self-looper adopts the project organization of diaphragm formula, abandons original float formula structure, and what the oil feed mode adopted is the negative pressure oil feed mode, can effectively avoid float formula structure because the compulsory oil feed condition that the change of oil pressure arouses, also avoids the oil leak phenomenon that rich oil arouses simultaneously, possesses stronger security and controllability.

2. This high temperature resistant self-loopa device through setting up the lower part of the body, can make the fuel in the carburetor retrieve to the engine oilcan in, carry out reciprocating type self-loopa operation to guarantee that the fuel in the lower cover oil storage area is mobile, help the radiating of fuel and cooling, can also carry out the pressure release action when the oil return, in order to alleviate the pressure that produces in the intracavity working process.

3. This high temperature resistant self-looper device can fine reduction carburetor's operating temperature through setting up negative pressure pump cover negative pressure chamber and lower cover oil storage chamber to the oil feed structure and the main part separation of this device, the intermediate junction adopts the plastics material to connect simultaneously, can guarantee the oil consumption loss of engine in the course of the work, satisfy the full load operation of engine.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic perspective view of the present invention;

FIG. 2 is a schematic structural view of a front section of a middle and lower body part according to the present invention;

FIG. 3 is a side view of the lower cover member of the present invention;

FIG. 4 is a front sectional view of the body member of the present invention;

FIG. 5 is a schematic elevational view in cross section of another body member of the present invention;

FIG. 6 is a schematic elevational view in cross section of another body member of the present invention;

FIG. 7 is a side view in cross section of the body member of the present invention;

FIG. 8 is a schematic top sectional view of the lower lid member of the present invention;

FIG. 9 is a side view of the lower cover member of the present invention;

FIG. 10 is a front sectional view of the lower cover member according to the present invention;

in the figure: 1. a body member; 11. a body; 1101. a negative pressure hole; 1102. a negative pressure chamber; 1103. a main oil outlet hole; 1104. an idle oil outlet hole; 1105. a third transition hole; 1106. a second transition hole; 1107. a first transition hole; 12. a negative pressure tube; 13. a main orifice; 14. a seal ring; 15. a main nozzle part; 16. a body air inlet; 17. an idle metering orifice; 18. a throttle valve; 19. a negative pressure rubber tube; 2. a middle and lower body component; 21. a lower body; 2101. an air chamber; 2102. the air inlet holes of the middle and lower bodies; 2103. a lower body oil storage cavity; 22. a pump cover gasket; 23. a pump cover diaphragm; 2301. the pump cover diaphragm is provided with an oil inlet one-way valve; 2302. the pump cover diaphragm oil outlet one-way valve; 24. a pump cover; 2401. a pump cover oil chamber; 2402. an air inlet hole of the pump cover; 2403. a pump cover fuel cavity; 2404. the pump cover stores an oil cavity; 25. a metering chamber gasket; 26. a needle valve diaphragm member; 27. the metering chamber is connected with the cover; 2701. a metering chamber cavity; 28. a measuring chamber cover pressure plate; 29. an oil inlet pipe; 210. an oil inlet bent pipe; 211. a needle valve seat; 212. a needle valve; 213. a needle valve spring; 214. a needle valve rocker arm; 215. a pump membrane return tower spring; 3. a lower cover member; 31. a negative pressure pump cover; 3101. a negative pressure cavity of the negative pressure pump cover; 32. a pagoda spring; 33. a negative pressure pump cover gasket; 34. a negative pressure pump cover diaphragm; 3401. the negative pressure pump cover diaphragm is provided with an oil inlet one-way valve; 3402. the negative pressure pump cover diaphragm oil outlet one-way valve; 35. a lower cover; 3501. a lower cover oil inlet hole; 3502. a lower cover fuel cavity; 3503. a lower cover oil storage cavity; 36. oil drain screws; 37. discharging an oil pipe; 38. an oil outlet pipe; 39. and a negative pressure branch pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Examples

Referring to fig. 1-10, the present invention provides the following technical solutions: a high-temperature resistant self-circulation device comprises a body 11 component 1, a middle and lower body component 2 and a lower cover component 3, wherein a diaphragm type design structure is adopted, the original float type structure is abandoned, a negative pressure oil inlet mode is adopted as the oil inlet mode, the forced oil inlet condition of the float type structure caused by the change of oil pressure can be effectively avoided, the oil leakage phenomenon caused by rich oil can be avoided, and the high-temperature resistant self-circulation device has stronger safety and controllability, the body 11 component 1 comprises a body 11, a negative pressure hole 1101 is formed inside the body 11, a negative pressure cavity 1102 is arranged inside the body 11, a main oil outlet 1103 is arranged inside the body 11, an idling oil outlet 1104 is formed inside the body 11, a third transition hole 1105 is formed inside the body 11, a second transition hole 1106 is formed inside the body 11, a first transition hole 1107 is formed inside the body 11, a negative pressure pipe 12 penetrates through the body 11, the main metering orifice 13 is arranged in the body 11, the sealing ring 14 is arranged in the body 11, the main nozzle component 15 is fixedly connected in the body 11, the middle and lower body component 2 is arranged at the bottom end of the component 1 of the body 11, the middle and lower body component 2 comprises a lower body 21, the lower body 21 is arranged, fuel oil in a carburetor can be recovered into an engine oil can to carry out reciprocating self-circulation operation so as to ensure that the fuel oil in an oil storage area of the lower cover 35 flows, the heat dissipation and the temperature reduction of the fuel oil are facilitated, the pressure relief action can be carried out during oil return so as to relieve the pressure generated in the working process in a cavity, the air chamber 2101 is arranged in the lower body 21, the middle and lower body air inlet hole 2102 is arranged in the lower body 21, the lower body oil storage cavity 2103 is arranged in the lower body 21, the pump cover gasket 22 is arranged on the lower surface of the lower body 21, and the pump cover diaphragm 23 is arranged on the lower surface of the pump cover gasket 22, the lower surface of the pump cover diaphragm 23 is provided with a pump cover 24, the lower cover part 3 is arranged at the bottom end of the middle lower body part 2, the lower cover part 3 comprises a negative pressure pump cover 31, a negative pressure pump cover negative pressure cavity 3101 is arranged inside the negative pressure pump cover 31, the side surface of the negative pressure pump cover 31 is provided with a pagoda spring 32, the side surface of the pagoda spring 32 is provided with a negative pressure pump cover gasket 33, and the side surface of the negative pressure pump cover gasket 33 is provided with a negative pressure pump cover diaphragm 34.

Specifically, a body air inlet 16 is formed in the body 11, the body air inlet 16 is arranged at the top end of the main nozzle part 15, an idle speed measuring hole 17 is formed in the body 11, a throttle 18 is arranged in the body 11, and a negative pressure rubber tube 19 is sleeved on the surface of the negative pressure tube 12.

Specifically, a pump cover diaphragm oil inlet check valve 2301 and a pump cover diaphragm oil outlet check valve 2302 are arranged inside the pump cover diaphragm 23, a pump cover oil chamber 2401 is formed inside the pump cover 24, a pump cover air inlet hole 2402 is formed inside the pump cover 24, and a pump cover fuel oil chamber 2403 is formed inside the pump cover 24.

Specifically, a pump cover oil storage cavity 2404 is formed in the pump cover 24, a metering chamber gasket 25 is arranged on the lower surface of the pump cover 24, a needle valve 212 diaphragm component 26 is arranged on the lower surface of the metering chamber gasket 25, and a metering chamber connecting cover 27 is arranged on the lower surface of the needle valve 212 diaphragm component 26.

Specifically, a metering chamber cavity 2701 is formed inside the metering chamber connecting cover 27, a metering chamber cover pressing plate 28 is sleeved on the surface of the metering chamber connecting cover 27, an oil inlet pipe 29 penetrates through the inside of the lower body 21, and an oil inlet bent pipe 210 penetrates through the inside of the lower body 21.

Specifically, a needle valve 212 is disposed inside the lower body 21, a needle valve spring 213 is disposed inside the lower body 21, a needle valve rocker arm 214 is disposed inside the lower body 21, the needle valve rocker arm 214 is disposed inside the lower body 21, and a pump diaphragm return spring 215 is disposed inside the lower body 21.

Specifically, the inside negative pressure pump cover diaphragm oil feed check valve 3401 and the negative pressure pump cover diaphragm check valve 3402 that produces oil that is provided with of negative pressure pump cover diaphragm 34, the side of negative pressure pump cover 31 is provided with lower cover 35, lower cover inlet port 3501 has been seted up to the inside of lower cover 35, lower cover fuel oil chamber 3502 has been seted up to the inside of lower cover 35, lower cover oil storage chamber 3503 has been seted up to the inside of lower cover 35, can fine reduction carburetor's operating temperature through setting up negative pressure pump cover negative pressure chamber 3101 and lower cover oil storage chamber 3503, and the oil feed structure and the main part separation of this device, intermediate junction adopts the plastics material to connect simultaneously, can guarantee the oil consumption loss of engine in the course of the work, satisfy the full load operation of engine.

Specifically, an oil drain screw 36 is inserted into the lower cover 35, an oil drain pipe 37 is inserted into the lower cover 35, an oil outlet pipe 38 is inserted into the lower cover 35, a negative pressure branch pipe 39 is inserted into the lower cover 35, and the other end of the negative pressure branch pipe 39 is inserted into the negative pressure rubber hose 19.

The working principle of the invention is as follows:

s1, when the device is used, firstly, the air inlet pulsation is directly transmitted to one side of an air chamber 2101 of a pump cover oil chamber 2401 through a negative pressure hole 1101 and a negative pressure cavity 1102 on a body 11 of the device, the other side is the pump cover oil chamber 2401 which is connected with an oil inlet pipe 29, meanwhile, a pump cover diaphragm oil inlet one-way valve 2301 and a pump cover diaphragm oil outlet one-way valve 2302 are arranged on an oil path of a pump cover fuel chamber 2403, when an engine rotates, the cylinder pulsation negative pressure passes through an air inlet hole on the body 11, and reaches the fuel chamber through a main nozzle, a main metering orifice 13, a middle and lower body air inlet hole 2102 and a pump cover air inlet hole 2402, so that a needle valve 212 diaphragm component 26 is driven to move upwards, an upper needle valve rocker arm 214 is pulled to open a needle valve 212, so that the oil inlet is realized under the repeated action of the engine cylinder pulsation negative pressure, and simultaneously, the suction force generated after the engine starts passes through an idling oil outlet hole 1104, a first transition hole 1107, a second transition hole 1106, a first transition hole 1107 and a second transition hole 1106, The third transition hole 1105, the main oil outlet 1103 on the body 11, the main air inlet of the middle and lower bodies 21, and the air inlet on the pump cover 24 are transmitted to the fuel chamber of the pump cover 24, negative pressure is generated in the fuel chamber of the diaphragm component 26 of the needle valve 212, the diaphragm component 26 of the needle valve 212 moves upwards by atmospheric pressure in the metering chamber 2701 on the opposite side, and the negative pressure acts on the rocker arm 214 of the needle valve to overcome the pressure of the spring 213 of the needle valve, so that the oil in the oil chamber 2401 of the pump cover enters the fuel chamber through the needle valve seat 211 and enters the engine upwards;

s2, when the device is in an idle working condition, the throttle valve 18 is basically closed, fuel enters the engine from the idle oil outlet 1104 and the first transition hole 1107 through the idle metering orifice 17, when the device is in a transition working condition, the opening degree of the throttle valve 18 is increased, the rotating speed of the engine is increased, the fuel is simultaneously sprayed out from the second transition hole 1106 and the third transition hole 1105 behind the throttle valve 18 and enters the engine, when the device is in a high-speed working condition, the fuel supply quantity is adjusted by the size of the main metering orifice 13, as the throttle valve 18 is further opened from a transition position to a full-open position, the air flow rate flowing through the negative pressure rubber hose 19 is increased, the oil flow rate is increased along with the requirement of the engine load, the action of the needle valve 212 diaphragm component 26 is the same as that in the idle working condition, and the pressure change acting on the needle valve 212 diaphragm component 26 is realized through the main oil outlet 1103;

s3, when the engine starts, the air inlet pulsation generated directly passes through the negative pressure pipe 12 on the body 11 of the device, is connected with the negative pressure branch pipe 39 on the negative pressure pump cover 31 through the flexible connection of the negative pressure rubber pipe 19, and then is transmitted into the negative pressure cavity 3101 of the negative pressure pump cover through the corresponding pore passage, the negative pressure cavity 1102 generates pressure difference under the action of the power to make the negative pressure pump cover diaphragm 34 move upwards, thereby providing a power to the fuel to open the negative pressure pump cover diaphragm oil inlet one-way valve 3401 to make the fuel flow from the oil inlet hole through the oil outlet hole on the negative pressure pump cover gasket 33, the oil storage cavity on the negative pressure pump cover 31, the negative pressure pump cover diaphragm oil outlet one-way valve 3402 and the corresponding pore passage, and enter the negative pressure cavity 3101 of the negative pressure pump cover, the fuel flows out from the oil outlet pipe 38 on the negative pressure pump cover 31 through the repeated action of the air inlet pulsation, and finally flows back to the oil tank of the engine, and the oil inlet composite rubber pipe on the engine is connected with the oil inlet elbow 210 on the lower body 21 of the device, when the oil can switch is opened, the fuel oil on the oil can switch sequentially passes through the oil inlet hole on the oil inlet bent pipe 210, the oil storage cavity on the middle lower body 21, the oil storage cavity on the lower cover 35 and the oil inlet pipe 29 and finally flows to the oil storage cavity on the pump cover 24, after a period of time, all the areas are filled with the fuel oil, and the fuel oil in the device is finally kept in a relatively stable state under the action of atmospheric pressure.

Although embodiments of the present invention have been shown and described above, it should be understood that the above embodiments are illustrative and not restrictive, and that those skilled in the art may make changes, modifications, substitutions and alterations to the above embodiments without departing from the scope of the present invention.

Claims

1. A high temperature resistant self-looper, includes body (11) part (1), lower part of the body part (2) and lower cover part (3), its characterized in that: the body (11) component (1) comprises a body (11), a negative pressure hole (1101) is formed in the body (11), a negative pressure cavity (1102) is arranged in the body (11), a main oil outlet hole (1103) is formed in the body (11), an idle oil outlet hole (1104) is formed in the body (11), a third transition hole (1105) is formed in the body (11), a second transition hole (1106) is formed in the body (11), a first transition hole (1107) is formed in the body (11), a negative pressure pipe (12) is arranged in the body (11) in a penetrating manner, a main metering orifice (13) is formed in the body (11), a sealing ring (14) is arranged in the body (11), a main nozzle component (15) is fixedly connected in the body (11), and the middle and lower body component (2) is arranged at the bottom end of the body (11) component (1), well lower part of the body part (2) includes the lower part of the body (21), the inside of the lower part of the body (21) is provided with air chamber (2101), the inside of the lower part of the body (21) is provided with well lower part of the body inlet port (2102), the inside of the lower part of the body (21) is provided with lower part of the body oil storage chamber (2103), the lower surface of the lower part of the body (21) is provided with pump cover gasket (22), the lower surface of pump cover gasket (22) is provided with pump cover diaphragm (23), the lower surface of pump cover diaphragm (23) is provided with pump cover (24), lower cover part (3) sets up the bottom of well lower part of the body part (2), lower cover part (3) includes negative pressure (31), negative pressure pump cover negative pressure chamber (3101) has been seted up to the inside of negative pressure pump cover (31), the side of negative pressure pump cover (31) is provided with pagoda spring (32), the side of pagoda spring (32) is provided with negative pressure pump cover gasket (33), and a negative pressure pump cover diaphragm (34) is arranged on the side surface of the negative pressure pump cover gasket (33).

2. The high temperature resistant self-circulating device of claim 1, wherein: the novel main nozzle is characterized in that a body air inlet hole (16) is formed in the body (11), the body air inlet hole (16) is formed in the top end of the main nozzle component (15), an idle speed measuring hole (17) is formed in the body (11), a throttle valve (18) is arranged in the body (11), and a negative pressure rubber tube (19) is sleeved on the surface of the negative pressure tube (12).

3. The high temperature resistant self-circulating device of claim 1, wherein: pump cover diaphragm oil feed check valve (2301) and pump cover diaphragm check valve (2302) that produces oil are provided with to the inside of pump cover diaphragm (23), pump cover oil cavity room (2401) has been seted up to the inside of pump cover (24), pump cover inlet port (2402) have been seted up to the inside of pump cover (24), pump cover fuel cavity (2403) have been seted up to the inside of pump cover (24).

4. The high temperature resistant self-circulating device of claim 1, wherein: the utility model discloses a metering pump, including pump cover (24), pump cover oil storage chamber (2404), the lower surface of pump cover (24) is provided with metering chamber gasket (25), the lower surface of metering chamber gasket (25) is provided with needle valve (212) diaphragm part (26), the lower surface of needle valve (212) diaphragm part (26) is provided with metering chamber and connects lid (27).

5. The high temperature resistant self-circulating device of claim 4, wherein: the inside of measurement room connection cover (27) has seted up measurement room chamber (2701), the surface of measurement room connection cover (27) has cup jointed measurement room cover clamp plate (28), oil inlet pipe (29) are worn to be equipped with in the inside of lower part of the body (21), oil inlet return bend (210) are worn to be equipped with in the inside of lower part of the body (21).

6. The high temperature resistant self-circulating device of claim 1, wherein: the inside of the lower part of the body (21) is provided with needle valve (212), the inside of the lower part of the body (21) is provided with needle valve spring (213), the inside of the lower part of the body (21) is provided with needle valve rocker arm (214), the inside of the lower part of the body (21) is provided with pump membrane return tower spring (215).

7. The high temperature resistant self-circulating device of claim 2, wherein: the oil pump is characterized in that a negative pressure pump cover diaphragm oil inlet check valve (3401) and a negative pressure pump cover diaphragm oil outlet check valve (3402) are arranged inside the negative pressure pump cover diaphragm (34), a lower cover (35) is arranged on the side face of the negative pressure pump cover (31), a lower cover oil inlet hole (3501) is formed inside the lower cover (35), a lower cover fuel oil cavity (3502) is formed inside the lower cover (35), and a lower cover oil storage cavity (3503) is formed inside the lower cover (35).

8. The high temperature resistant self-circulating device of claim 7, wherein: oil drain screw (36) are worn to be equipped with in the inside of lower cover (35), oil drain pipe (37) are worn to be equipped with in the inside of lower cover (35), oil outlet pipe (38) are worn to be equipped with in the inside of lower cover (35), negative pressure branch pipe (39) are worn to be equipped with in the inside of lower cover (35), the inside at negative pressure rubber tube (19) is worn to establish by the other end of negative pressure branch pipe (39).