CN115853687A - Low inertia oil sprayer of quick closing valve - Google Patents
Low inertia oil sprayer of quick closing valve Download PDFInfo
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- CN115853687A CN115853687A CN202211695780.7A CN202211695780A CN115853687A CN 115853687 A CN115853687 A CN 115853687A CN 202211695780 A CN202211695780 A CN 202211695780A CN 115853687 A CN115853687 A CN 115853687A
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Abstract
The invention discloses a low-inertia oil sprayer for a quick closing valve, which comprises an oil sprayer body (1), an electromagnet component (2), a control valve seat (3), a needle valve body (4) and a needle valve matching part (5) arranged in the needle valve body; the method is characterized in that: an intermediate valve (6) has been arranged between needle valve idol spare (5) and control valve seat (3), intermediate valve (6) are divided into two parts from top to bottom with control chamber B, are respectively chamber (B1) under the control chamber of constituteing by intermediate valve (6) and needle valve cover (5B) to and by control chamber upper chamber (B2) that disk seat (6 a) of control valve seat (3) and intermediate valve (6) constitute. The fuel injector of the patent application can realize the fuel injection rule of 'slow first then urgent'. When the electromagnetic valve is not opened, no fuel static leakage exists. After the electromagnetic valve is opened, the dynamic leakage quantity of the fuel is much smaller than that of the prior art.
Description
Technical Field
The invention belongs to the technical field of oil supply systems of internal combustion engines, and particularly relates to a low-inertia oil sprayer of a quick closing valve of a common rail type oil spraying system.
Background
In order to further improve the thermal efficiency and reduce the power loss of the internal combustion engine, the technology of the oil injector needs to be upgraded, and the structure with high-pressure fuel oil static leakage in the gap of the matching parts needs to be upgraded to the structure without high-pressure static leakage.
The fuel injector without static leakage usually has only one needle valve matching part, and the two ends of the matching part are respectively a high-pressure cavity and a control cavity.
The oil injector has the disadvantages that the rising speed is high when the needle valve is opened; when the needle valve is seated, the descending speed is slower. The phenomenon that the oil injection rule is firstly fast and then slow is caused, and the phenomenon is just opposite to the ideal 'firstly slow and then fast' oil injection rule.
A common configuration for a fuel injector without static leakage and low inertia is shown in fig. 5 and 6.
The lower end of the oil sprayer body 1 is provided with a high-pressure oil inlet channel 1a and an electromagnet mounting hole 1b in parallel. An electromagnet member 2 is placed in this hole 1b; the control valve seat 3 is arranged between the oil injector body 1 and the needle valve body 4; wherein the eccentrically arranged throttle hole Z is coaxial with an armature rod of the electromagnet component to form a switch valve; when the electromagnet is energized, the valve opens and fuel leaks through orifice Z to the low pressure chamber; the needle valve matching part 5 is arranged in the needle valve body 4 and is guided by an inner hole at the lower end of the needle valve body; the inner space at the upper end of the needle valve matching part 5 and the lower end surface of the control valve seat 3 form a control cavity B; the outside of the needle valve matching part 5 and the annular space inside the needle valve body 4 form a pressure accumulation volume cavity A which is communicated with the high-pressure oil inlet hole 1a of the oil sprayer body through an oil passage hole 3b of the control valve seat; a throttle hole X is arranged at the upper end of a needle valve sleeve 5B of the needle valve matching part 5 to communicate the pressure accumulation volume cavity A with the control cavity B; the control chamber B communicates with the oil outlet orifice Z through the control valve seat oil passage hole 3 a.
When the solenoid valve is opened, in order to decrease the speed of raising the needle valve 5a, the speed of pressure decrease in the control chamber B is slowed, and it is determined that the hole diameter and the flow rate of the oil restriction hole Z are both as small as possible.
Obviously, the oil inlet throttle hole X is smaller than or equal to the oil outlet throttle hole Z, and the reduction of Z causes X to be smaller.
As a result, when the solenoid valve is closed and the needle valve is about to move downward and close, the flow rate of the fuel flowing from the pressure accumulation chamber a into the control chamber B through the throttle X is relatively low, so that the pressure rise rate of the control chamber B is relatively slow and the seating of the needle valve is slowed.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a low-inertia oil injector of a quick closing valve of a common rail type oil injection system.
The invention is realized in this way, a low inertia oil sprayer of the fast shut-off valve, including the oil sprayer body (1), the electromagnet component (2), the control valve base (3), the needle valve body (4), and the needle valve matching part (5) installed in needle valve body; a high-pressure oil inlet channel (1 a) and an electromagnet mounting hole (1 b) are arranged on the oil injector body (1) in parallel; the needle valve matching part (5) is arranged in the needle valve body (4), the needle valve matching part (5) comprises a needle valve (5 a) and a needle valve sleeve (5 b), and the needle valve (5 a) is inserted into a guide hole at the lower end of the needle valve body; a needle valve sleeve (5B) of the needle valve matching part (5) and the lower end surface of the control valve seat (3) form a control cavity B correspondingly; the outside of the needle valve matching part (5) and the annular space inside the needle valve body (4) form a pressure accumulation volume cavity (A) which is communicated with the high-pressure oil inlet hole (1 a) of the oil injector body through an oil passage hole (3 b) of the control valve seat; the method is characterized in that: an intermediate valve (6) is arranged between the needle valve matching part (5) and the control valve seat (3), and comprises an intermediate valve seat (6 a) and a valve core (6 b), wherein the valve core is installed in the valve seat in a sliding and sealing mode; the intermediate valve (6) divides the control cavity B into an upper part and a lower part, namely a control cavity lower chamber (B1) consisting of the intermediate valve (6) and a needle valve sleeve (5B) and a control cavity upper chamber (B2) consisting of a control valve seat (3) and a valve seat (6 a) of the intermediate valve (6); a middle valve oil outlet throttling hole (Y) which is communicated with the control cavity lower chamber B1 and the control cavity upper chamber B2 is formed in the valve seat (6 a); the valve seat (6 a) of the intermediate valve (6) is provided with an intermediate valve oil inlet throttling hole X which is used for communicating the pressure accumulation volume cavity (A) with the control cavity (B); the control cavity upper chamber (B2) is communicated with a control valve seat oil outlet orifice (Z) of the control valve seat (3) through a control valve seat oil passage hole (3 a); the oil inlet throttling hole (X) of the intermediate valve is less than or equal to the oil outlet throttling hole (Z) of the control valve seat; and the middle valve oil inlet throttling hole (X) > is larger than the middle valve oil outlet throttling hole (Y).
Preferably, an annular positioning connecting sleeve (7) is arranged between the valve sleeve of the intermediate valve and the needle valve sleeve of the needle valve matching part (5).
Preferably, the excircle of the needle valve sleeve (5 b) is in transition fit with the inner circle of the annular positioning connecting sleeve (7), and the excircle of the intermediate valve seat (6 a) is in clearance fit with the inner circle of the annular positioning connecting sleeve (7).
Preferably, an angle difference is arranged between the lower end sealing conical surface of the valve seat (6 a) of the intermediate valve and the sealing conical surface of the valve core (6 b), and the valve seat (6 a) and the valve core (6 b) form a double-conical-surface valve (62).
Preferably, the angular difference is between 0.5 ° and 1.5 °.
Preferably, a hole (5 a 1) is arranged at the upper end of the needle valve body, a spring (8) is arranged in the hole (5 a 1), the lower end of the spring is supported at the hole bottom of the hole (5 a 1), and the upper end of the spring abuts against the lower end face of the valve core (6 b).
Preferably, the value range of the oil inlet throttle hole (X) is between 0.1 and 0.2 mm.
The invention has the advantages and technical effects that: the fuel injector of the patent application can realize the fuel injection rule of 'slow first then urgent'. When the electromagnetic valve is not opened, no fuel static leakage exists. After the electromagnetic valve is opened, the dynamic leakage quantity of the fuel is much smaller than that of the prior art.
Drawings
FIG. 1 is an assembly view of a fuel injector assembly according to the present application;
FIG. 2 is an enlarged view of a portion of the fuel injector control of the present application;
FIG. 3 is a schematic diagram of an opening control circuit according to the present application;
FIG. 4 is a schematic view of the present application closing control circuit;
FIG. 5 is a schematic view of a prior art structure;
FIG. 6 is a prior art control oil circuit diagram;
FIG. 7 is a graph comparing the injection timing of two injectors of the present invention and the prior art.
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 to 4, a low inertia fuel injector for a fast closing valve includes a fuel injector body 1, an electromagnet member 2, a control valve seat 3, a needle valve body 4, and a needle valve coupling 5 installed in the needle valve body; a high-pressure oil inlet channel 1a and an electromagnet mounting hole 1b are arranged on the oil injector body 1 in parallel; the needle valve matching part 5 is arranged in the needle valve body 4, the needle valve matching part 5 comprises a needle valve 5a and a needle valve sleeve 5b, and the needle valve 5a is inserted in a guide hole at the lower end of the needle valve body; a needle valve sleeve 5B of the needle valve matching part 5 and the lower end surface of the control valve seat 3 correspondingly form a control cavity B; the outside of the needle valve matching part 5 and the annular space inside the needle valve body 4 form a pressure accumulation volume cavity A which is communicated with a high-pressure oil inlet hole 1a of the oil sprayer body through an oil passage hole 3b of the control valve seat;
the invention is characterized in that an intermediate valve 6 is arranged between the needle valve matching part 5 and the control valve seat 3, the intermediate valve comprises an intermediate valve seat 6a and a valve core 6b, and the valve core is arranged in the valve seat in a sliding and sealing mode; the intermediate valve 6 divides the control cavity B into an upper part and a lower part, namely a control cavity lower chamber B1 consisting of the intermediate valve 6 and a needle valve sleeve 5B and a control cavity upper chamber B2 consisting of a control valve seat 3 and a valve seat 6a of the intermediate valve 6; an intermediate valve oil outlet orifice Y for communicating the control cavity lower chamber B1 with the control cavity upper chamber B2 is arranged on the valve seat 6 a; an oil inlet orifice X of the intermediate valve is arranged on a valve seat 6a of the intermediate valve 6 to communicate the pressure accumulation volume cavity A with the control cavity B; the control cavity upper chamber B2 is communicated with a control valve seat oil outlet orifice Z of the control valve seat 3 through a control valve seat oil passage hole 3 a;
the oil inlet throttling hole X of the intermediate valve is not more than the oil outlet throttling hole Z of the control valve seat; and the middle valve oil inlet throttling hole X is larger than the middle valve oil outlet throttling hole Y.
Preferably, an annular positioning connecting sleeve 7 is arranged between the valve sleeve of the intermediate valve and the needle valve sleeve of the needle valve matching part 5.
Preferably, the excircle of the needle valve sleeve 5b is in transition fit with the inner circle of the annular positioning connecting sleeve 7, and the excircle of the intermediate valve seat 6a is in clearance fit with the inner circle of the annular positioning connecting sleeve 7.
Preferably, an angle difference is provided between the lower end sealing conical surface of the valve seat 6a and the sealing conical surface of the valve core 6b of the intermediate valve, and the valve seat 6a and the valve core 6b form a double-conical-surface valve 62. In order to ensure a flow area when the valve element is opened and a small impact force when seated, the angular difference between the two conical surfaces is set to a small range, preferably, 0.5 to 1.5.
Preferably, in order to ensure a quick and reliable seating of the valve element 6b, a bore 5a1 is provided at the upper end of the needle valve body, a spring 8 is arranged in said bore 5a1, the lower end of the spring is supported at the bottom of the bore 5a1, and the upper end of the spring abuts against the lower end face of the valve element 6 b.
In the process that the needle valve is lifted to start oil injection after the electromagnetic valve is electrified, the hydraulic change speed applied to the top end of the needle valve, namely the pressure change speed of the lower chamber B1 of the control cavity is very slow compared with the common structure. This is achieved on the one hand by virtue of the small diameter of the intermediate valve outlet orifice Y, for example < 0.1mm; on the other hand, thanks to the slower rate of pressure change in the upper chamber B2 of the control chamber. The control cavity upper chamber B2 can have a slow pressure reduction speed after the electromagnetic valve is electrified, and the pressure reduction speed depends on the small diameter of the oil outlet orifice Z of the control valve seat, such as less than 0.2mm; and fuel is supplemented to the control cavity upper chamber B2 from the pressure accumulation cavity A through the fuel inlet throttle hole X. Obviously, in the oil injection process after the electromagnetic valve is opened, the intermediate valve oil inlet throttling hole X is required to be smaller than or equal to the control valve seat oil outlet throttling hole Z.
When the electromagnetic valve is powered off and oil injection is required to be finished, the oil outlet orifice Z is closed, the pressure rising speed of the control cavity upper chamber B2 is larger than the pressure rising speed of the control cavity lower chamber B1, and the pressure of the control cavity upper chamber B2 is larger than the pressure of the control cavity lower chamber B1. In order to increase the pressure difference between the two volume chambers and quickly and reliably open the intermediate valve core 6b, the intermediate valve oil inlet throttle hole X is required to be larger than the intermediate valve oil outlet throttle hole Y. Therefore, the value range of the oil inlet throttling hole X is between 0.1mm and 0.2 mm.
When the valve element 6B is opened, the fuel in the pressure accumulation volume chamber a flows into the control chamber lower chamber B1 through the valve port 62 via the oil hole 6a1 of the valve seat 6a and the oil passage 63 formed by the annular space of the valve element 6B. This causes the pressure in the control chamber lower chamber B1 to rise rapidly in a moment, i.e., the hydraulic force at the needle tip rises rapidly, and the needle is seated rapidly.
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 (7)
1. A low inertia oil sprayer of a quick closing valve comprises an oil sprayer body (1), an electromagnet component (2), a control valve seat (3), a needle valve body (4) and a needle valve matching part (5) arranged in the needle valve body; a high-pressure oil inlet channel (1 a) and an electromagnet mounting hole (1 b) are arranged on the oil injector body (1) in parallel; the needle valve matching part (5) is arranged in the needle valve body (4), the needle valve matching part (5) comprises a needle valve (5 a) and a needle valve sleeve (5 b), and the needle valve (5 a) is inserted into a guide hole at the lower end of the needle valve body; a needle valve sleeve (5B) of the needle valve matching part (5) and the lower end surface of the control valve seat (3) form a control cavity B correspondingly; the outside of the needle valve matching part (5) and the annular space inside the needle valve body (4) form a pressure accumulation volume cavity (A) which is communicated with the high-pressure oil inlet hole (1 a) of the oil injector body through an oil passage hole (3 b) of the control valve seat; the method is characterized in that: an intermediate valve (6) is arranged between the needle valve matching part (5) and the control valve seat (3), and comprises an intermediate valve seat (6 a) and a valve core (6 b), wherein the valve core is installed in the valve seat in a sliding and sealing mode; the intermediate valve (6) divides the control cavity B into an upper part and a lower part, namely a control cavity lower chamber (B1) consisting of the intermediate valve (6) and a needle valve sleeve (5B) and a control cavity upper chamber (B2) consisting of a control valve seat (3) and a valve seat (6 a) of the intermediate valve (6); a middle valve oil outlet orifice (Y) which is communicated with the control cavity lower chamber B1 and the control cavity upper chamber B2 is arranged on the valve seat (6 a); the valve seat (6 a) of the intermediate valve (6) is provided with an intermediate valve oil inlet throttling hole X which is used for communicating the pressure accumulation volume cavity (A) with the control cavity (B); the control cavity upper chamber (B2) is communicated with a control valve seat oil outlet orifice (Z) of the control valve seat (3) through a control valve seat oil passage hole (3 a); the oil inlet throttling hole (X) of the intermediate valve is less than or equal to the oil outlet throttling hole (Z) of the control valve seat; and the middle valve oil inlet throttling hole (X) > is larger than the middle valve oil outlet throttling hole (Y).
2. The low inertia fuel injector for a quick to close valve of claim 1, wherein: and an annular positioning connecting sleeve (7) is arranged between the valve sleeve of the intermediate valve and the needle valve sleeve of the needle valve coupling part (5).
3. The low inertia fuel injector for a quick to close valve of claim 1, wherein: the excircle of the needle valve sleeve (5 b) is in transition fit with the inner circle of the annular positioning connecting sleeve (7), and the excircle of the intermediate valve seat (6 a) is in clearance fit with the inner circle of the annular positioning connecting sleeve (7).
4. The low inertia fuel injector for a quick to close valve of claim 1, wherein: an angle difference is arranged between the lower end sealing conical surface of the valve seat (6 a) of the middle valve and the sealing conical surface of the valve core (6 b), and the valve seat (6 a) and the valve core (6 b) form a double-conical-surface valve (62).
5. The low inertia fuel injector for a quick to close valve of claim 1, wherein: the angle difference is 0.5-1.5 deg.
6. The low inertia fuel injector for a quick to close valve of claim 1, wherein: the upper end of the needle valve body is provided with a hole (5 a 1), a spring (8) is arranged in the hole (5 a 1), the lower end of the spring is supported at the bottom of the hole (5 a 1), and the upper end of the spring abuts against the lower end face of the valve core (6 b).
7. The low inertia fuel injector for a quick to close valve of claim 1, wherein: the value range of the oil inlet throttle hole (X) is between 0.1 and 0.2 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211695780.7A CN115853687A (en) | 2022-12-28 | 2022-12-28 | Low inertia oil sprayer of quick closing valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211695780.7A CN115853687A (en) | 2022-12-28 | 2022-12-28 | Low inertia oil sprayer of quick closing valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115853687A true CN115853687A (en) | 2023-03-28 |
Family
ID=85655400
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211695780.7A Pending CN115853687A (en) | 2022-12-28 | 2022-12-28 | Low inertia oil sprayer of quick closing valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115853687A (en) |
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2022
- 2022-12-28 CN CN202211695780.7A patent/CN115853687A/en active Pending
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