CN113915035A - High pressure fuel injection pump is with inlet valve mounting structure - Google Patents
High pressure fuel injection pump is with inlet valve mounting structure Download PDFInfo
- Publication number
- CN113915035A CN113915035A CN202111333435.4A CN202111333435A CN113915035A CN 113915035 A CN113915035 A CN 113915035A CN 202111333435 A CN202111333435 A CN 202111333435A CN 113915035 A CN113915035 A CN 113915035A
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- CN
- China
- Prior art keywords
- oil inlet
- plunger
- inlet valve
- valve
- plunger sleeve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/48—Assembling; Disassembling; Replacing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M59/00—Pumps specially adapted for fuel-injection and not provided for in groups F02M39/00 -F02M57/00, e.g. rotary cylinder-block type of pumps
- F02M59/44—Details, components parts, or accessories not provided for in, or of interest apart from, the apparatus of groups F02M59/02 - F02M59/42; Pumps having transducers, e.g. to measure displacement of pump rack or piston
- F02M59/46—Valves
- F02M59/464—Inlet valves of the check valve type
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fuel-Injection Apparatus (AREA)
Abstract
The invention discloses an oil inlet valve mounting structure for a high-pressure oil injection pump, which comprises a plunger sleeve, a plunger and an oil inlet valve core assembly, wherein the plunger sleeve is sleeved on the plunger sleeve; the oil inlet valve core assembly comprises a valve rod, a spring seat, an oil inlet valve spring and a valve core integrated with the valve rod, the top of the plunger sleeve is provided with a through hole coincided with the center of the plunger, and the valve rod is arranged in the through hole in a sliding manner; a volume cavity is integrally arranged on the plunger sleeve, and the oil inlet buffer is communicated with an oil inlet channel arranged on the plunger sleeve; a sealing gland is screwed on the volume cavity; the upper end of the valve rod is located in the volume cavity, a spring seat is fixedly installed at the end part of the valve rod in the volume cavity, and an oil inlet valve spring is installed between the spring seat and the top of the plunger table. The invention integrates the valve seat of the oil inlet valve and the plunger sleeve, eliminates the installation joint surface of the traditional valve seat and the plunger sleeve, and eliminates the risk of high pressure leakage at the position.
Description
Technical Field
The invention belongs to a fuel injection system of a diesel engine, and particularly relates to an oil inlet valve mounting structure for a high-pressure fuel injection pump of a common rail system.
Background
A high-pressure fuel injection pump (hereinafter referred to as a high-pressure pump) of a common rail system of a diesel engine is a core part of a fuel injection system, and the structure of a fuel system of the fuel injection core part determines the reliability and the product life of a fuel pump to a certain extent.
The pumping oil system is a key component of the high pressure pump, and is responsible for converting low pressure fuel oil into high pressure oil, and an oil inlet valve and a plunger sleeve of the pumping oil system are connected in a compression mode to form a closed fuel oil volume cavity, please refer to fig. 2. The sealing surface is easy to leak fuel oil due to long-term repeated high-pressure impact, and the reliability and the service life of the oil pump are further influenced.
In a traditional high-pressure pump, an oil inlet valve assembly is assembled in a plunger sleeve in a compression mode to form a closed fuel volume cavity, the risk of high-pressure leakage of a joint surface of the oil inlet valve assembly and the plunger sleeve is increased along with the pressure rise of a common rail, and once the high-pressure leakage occurs, the high-pressure pump can generate oil supply insufficiency, pressure reduction or even oil supply failure, so that the system failure is caused.
Therefore, the invention provides a method for eliminating the installation joint surface of the traditional valve seat and the plunger sleeve and eliminating the risk of high-pressure leakage at the position
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an oil inlet valve mounting structure for a high-pressure oil injection pump.
The invention is realized in this way, a high-pressure fuel injection pump is with the inlet valve mounting structure, including the plunger bushing, there are oil inlet and oil outlet on the said plunger bushing, the plunger is fitted with the plunger in the plunger cavity of the said plunger bushing, also include the valve core assembly of oil inlet; the oil inlet valve core assembly comprises a valve rod, a spring seat, an oil inlet valve spring and a valve core integrated with the valve rod, and is characterized in that the top of the plunger sleeve is provided with a through hole coinciding with the center of the plunger, and the valve rod is arranged in the through hole in a sliding manner; a conical sealing surface matched with the sealing surface of the valve core is arranged in the plunger cavity; a volume cavity is integrally arranged on the plunger sleeve on the outer circumference of the through hole and is communicated with an oil inlet channel arranged on the plunger sleeve; a sealing gland is screwed on the volume cavity; the upper end of the valve rod is located in the volume cavity, a spring seat is fixedly installed at the end part of the valve rod in the volume cavity, and an oil inlet valve spring is installed between the spring seat and the top of the plunger table.
Preferably, the spring seat and the valve rod are in interference fit.
The invention has the advantages and technical effects that: the valve seat of the oil inlet valve and the plunger sleeve are designed into an integrated structure, and the oil inlet valve core is directly arranged in the through hole in the top of the plunger sleeve, so that the oil inlet function is realized; the invention integrates the valve seat of the oil inlet valve and the plunger sleeve, eliminates the installation joint surface of the traditional valve seat and the plunger sleeve, and eliminates the risk of high pressure leakage at the position.
Drawings
FIG. 1 is a schematic structural view of the present invention;
fig. 2 is a schematic diagram of a prior art structure.
In the figure, 1, a plunger sleeve; 1-1, an oil inlet; 1-2, oil outlet; 1-3, through holes; 1-4, conical sealing surface; 1-5, a volume cavity; 1-6, oil inlet channels; 2. a plunger; 3. an oil inlet valve core assembly; 3-1, a valve rod; 3-2, a spring seat; 3-3, an oil inlet valve spring; 3-4, valve core; 4. a sealing gland; 5. a valve seat.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, the oil inlet valve mounting structure for the high-pressure oil injection pump comprises a plunger sleeve 1, wherein an oil inlet 1-1 and an oil outlet 1-2 are arranged on the plunger sleeve, a plunger 2 is arranged in a plunger cavity of the plunger sleeve, and the oil inlet valve core assembly 3 is further arranged; the oil inlet valve core assembly 3 comprises a valve rod 3-1, a spring seat 3-2, an oil inlet valve spring 3-3 and a valve core 3-4 integrated with the valve rod, the top of the plunger sleeve is provided with a through hole 1-3 coinciding with the center of the plunger, and the valve rod is arranged in the through hole in a sliding mode; a conical sealing surface 1-4 matched with the sealing surface of the valve core is arranged in the plunger cavity; equivalently, the valve seat of the oil inlet valve and the plunger sleeve are combined into a whole, the installation joint surface of the traditional valve seat and the traditional plunger sleeve is eliminated, and the risk of high-pressure leakage at the position is eliminated. In addition, the plunger sleeve is integrally provided with a volume cavity 1-5 on the outer circumference of the through hole, and the volume cavity is communicated with an oil inlet channel 1-6 arranged on the plunger sleeve; the volume cavity is provided with the sealing gland 4 in a screwed mode, and the structure is simple; the upper end of the valve rod is positioned in the volume cavity, a spring seat 3-2 is fixedly arranged at the end part of the valve rod in the volume cavity, the spring seat and the valve rod are preferably in interference fit, but the valve rod is not limited to the interference fit, and the valve rod can also be fixedly connected in a pin, snap ring and other modes; and an oil inlet valve spring 3-3 is arranged between the spring seat and the top of the plunger platform. The pre-tightening force of the oil inlet valve spring 3-3 is controlled by controlling the press-fit height of the oil inlet valve spring seat, so that the opening pressure of the oil inlet valve is controlled. During actual work, the plunger moves downwards, the oil inlet valve is opened, and fuel oil enters the plunger cavity; the plunger piston moves upwards, the oil inlet valve is closed, the fuel oil is pressurized and then sent to the oil outlet, and high-pressure external supply is carried out through the pipeline.
The valve seat and the plunger sleeve of the oil inlet valve are designed into an integrated structure, the oil inlet valve core is directly installed in the through hole in the top of the plunger sleeve, the oil inlet function is realized, the installation joint surface of the traditional valve seat and the traditional plunger sleeve is eliminated, the risk of high-pressure leakage is eliminated, and in addition, the impact on the oil inlet valve core assembly is reduced by the additionally arranged volume cavity, and the stability of the oil inlet valve core is ensured.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (2)
1. An oil inlet valve mounting structure for a high-pressure oil injection pump comprises a plunger sleeve, wherein an oil inlet and an oil outlet are formed in the plunger sleeve, a plunger is mounted in a plunger cavity of the plunger sleeve, and the oil inlet valve mounting structure also comprises an oil inlet valve core assembly; the oil inlet valve core assembly comprises a valve rod, a spring seat, an oil inlet valve spring and a valve core integrated with the valve rod, and is characterized in that the top of the plunger sleeve is provided with a through hole coinciding with the center of the plunger, and the valve rod is arranged in the through hole in a sliding manner; a conical sealing surface matched with the sealing surface of the valve core is arranged in the plunger cavity; a volume cavity is integrally arranged on the plunger sleeve on the outer circumference of the through hole and is communicated with an oil inlet channel arranged on the plunger sleeve; a sealing gland is screwed on the volume cavity; the upper end of the valve rod is located in the volume cavity, a spring seat is fixedly installed at the end part of the valve rod in the volume cavity, and an oil inlet valve spring is installed between the spring seat and the top of the plunger table.
2. The inlet valve mounting structure for a high-pressure injection pump according to claim 1, wherein: the spring seat and the valve rod are in interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111333435.4A CN113915035A (en) | 2021-11-11 | 2021-11-11 | High pressure fuel injection pump is with inlet valve mounting structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111333435.4A CN113915035A (en) | 2021-11-11 | 2021-11-11 | High pressure fuel injection pump is with inlet valve mounting structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113915035A true CN113915035A (en) | 2022-01-11 |
Family
ID=79246213
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111333435.4A Pending CN113915035A (en) | 2021-11-11 | 2021-11-11 | High pressure fuel injection pump is with inlet valve mounting structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN113915035A (en) |
-
2021
- 2021-11-11 CN CN202111333435.4A patent/CN113915035A/en active Pending
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