CN107131333B

CN107131333B - High-pressure pump and overflow assembly thereof

Info

Publication number: CN107131333B
Application number: CN201610112207.7A
Authority: CN
Inventors: 王永平; 熊文英; 王敏珠
Original assignee: Bosch Automotive Diesel Systems Co Ltd
Current assignee: Bosch powertrain Co.,Ltd.
Priority date: 2016-02-29
Filing date: 2016-02-29
Publication date: 2020-05-22
Anticipated expiration: 2036-02-29
Also published as: CN107131333A

Abstract

The overflow assembly comprises a shell and a pore passage arranged in the shell, wherein an elastic diaphragm is arranged in the pore passage and divides the pore passage into an inlet side and an outlet side, the inlet side is connected with an oil inlet, the elastic diaphragm is pressed against and seals the oil inlet, the outlet side is connected with an outlet hole, and one side of the elastic diaphragm can elastically deform from the inlet side to the outlet side so as to enable the inlet side to be communicated with the outlet side. The overflow assembly of the invention has a simple structure.

Description

High-pressure pump and overflow assembly thereof

Technical Field

The invention relates to a high-pressure pump and an overflow assembly thereof.

Background

In the field of fluid control, relief valves are often used to control pressure in a fluid passageway. When the pressure in the fluid passage is low, the relief valve closes. When the pressure in the fluid passage is high, the relief valve opens, thereby partially relieving the fluid in the fluid passage, thereby reducing the fluid pressure in the fluid passage to a desired level to protect the pressure device and control the flow rate.

Relief valves, in particular those used in the field of high-pressure pumps, generally adopt a structure as shown in fig. 1 and 2, and comprise a separate housing 9, a passage 90 is provided in the housing 9, and the passage 90 is divided into three continuous passages, a piston chamber 91, a spring chamber 92 and a seal chamber 93. The diameter increases continuously from the piston chamber 91 to the spring chamber 92 and the seal chamber 93. A piston 81 is disposed in the piston chamber 91 for reciprocating movement along the piston chamber, a spring 82 is disposed in the spring chamber 92, and a sealing ball 83 is disposed in the sealing chamber 93. One end of the spring 82 is pressed against the sealing ball 83, and the other end is pressed against the piston 81, and the spring 82 has a pre-tightening pressure. The middle of the piston chamber 91 is connected with a pressure relief channel 910, and when the pressure at the lower part of the oil channel 90 is higher than the pressure of the spring 82, the piston 81 moves upwards. When the oil pressure reaches the set value, the lower edge of the piston 81 moves to communicate with the pressure relief passage 910, and the high-pressure oil flows out from the pressure relief passage 910, so that the pressure in the passage 90 returns to the normal value.

The overflow valve in the prior art can effectively achieve the overflow effect, however, the structure is complex, and the occupied space is large. It is desirable to provide a relief valve which is simple in structure and occupies a small space.

Disclosure of Invention

The invention aims to provide an overflow assembly with a simple structure and a small spot space and a high-pressure pump thereof.

The invention provides an overflow assembly, which comprises a shell and a pore passage arranged in the shell, wherein one end of the pore passage is connected with an oil inlet, one elastic diaphragm is arranged in the pore passage to seal the oil inlet, the other side of the elastic diaphragm is provided with a plug, the plug is provided with a pressing part, the elastic diaphragm is pressed against the oil inlet from one side of the elastic diaphragm, an accommodating space is formed between the plug and the elastic diaphragm, one side of the elastic diaphragm, which is not pressed by the pressing part, can be bent towards the accommodating space, so that the oil inlet is communicated with the accommodating space, the accommodating space is further communicated with a drainage hole, a bearing platform is arranged on the shell at one side of the oil inlet, the pressing part is pressed on the bearing platform, and a drop step is arranged on the shell part opposite to the bearing platform, the drop height step protrudes further into the accommodating space than the receiving platform.

Preferably, the elastic diaphragm is provided with an exhaust hole, and the oil inlet can be in gas communication with the accommodating space through the exhaust hole.

Preferably, the outer ring of the receiving platform forms a counter bore, the oil inlet is communicated with the counter bore, the housing protrudes into the pore passage to form a positioning convex column, the plug is provided with a receiving groove in butt joint with the positioning convex column, the elastic membrane is provided with a positioning hole, the positioning hole can be positioned with the positioning convex column, the receiving platform is annularly arranged on the periphery of the positioning convex column, and an inner ring receiving groove is formed in the direction of the receiving platform along the periphery of the positioning convex column.

The invention also provides a high-pressure pump, wherein the high-pressure pump comprises a pump shell and a pump hole channel arranged in the pump shell, the pump shell and the pump hole channel are used as the shell and the hole channel to form an overflow assembly, and the overflow assembly has the characteristics as described above.

Preferably, the oil inlet is communicated with a high-pressure pump fuel metering unit, and the drain hole is communicated with an oil tank of the high-pressure pump or communicated with a high-pressure pump oil return channel.

Drawings

Exemplary embodiments of the present invention will be described in detail below with reference to the attached drawings, it being understood that the embodiments described below are merely illustrative of the present invention and do not limit the scope of the present invention, wherein:

FIG. 1 is a block diagram of a prior art relief valve in a first state;

FIG. 2 is a block diagram of the relief valve of FIG. 1 in a second condition;

FIG. 3 is a schematic diagram of the construction of one embodiment of the overflow assembly of the present invention, with the housing portion shown only partially;

FIG. 4 is an enlarged partial view of one embodiment of the overflow assembly of the present invention to show the configuration of the stepped portion of the fall;

FIG. 5 is an enlarged view of a portion of one embodiment of the overflow assembly of the present invention, showing the elastic membrane in a folded configuration.

Detailed Description

In different drawings, the same or similar components are denoted by the same reference numerals.

It is to be understood that the drawings are designed solely for purposes of illustration and that no limitation on the invention is intended in the form of the details of construction and the arrangement of the components set forth in the drawings.

Referring now to FIG. 3, a diagram of one embodiment of the overflow assembly 10 of the present invention is shown. The overflow arrangement 10 is integrated in a high-pressure pump 1. A high-pressure pump 1 according to an exemplary embodiment of the invention is shown only partially and comprises a pump housing and a pump opening arranged in the pump housing, namely as a housing 11 and an opening 12 of an overflow arrangement 10. In the high pressure pump system, a fuel metering unit (not shown) is arranged at the front end of the overflow assembly 10 and is connected with an oil inlet 13 at one end of the pore passage 12. The oil inlet 13 is communicated with a counter bore 115, the counter bore 115 is annular, and a positioning convex column 113 is formed by protruding a part of the shell 11 at the central position of the counter bore 115 forwards. A receiving platform 110 is formed at the outer periphery of the positioning boss 113. The elastic membrane 14 is an annular disc, and a positioning hole 142 is formed in the center of the elastic membrane, and the positioning hole 142 is matched with the positioning boss 113, so that the elastic membrane 14 is positioned in the duct 12. The elastic diaphragm 14 closes said counter bore 115 and thus also closes the oil inlet 13. In other embodiments, the counterbore 115 may be omitted, and the flexible diaphragm 14 then closes the oil inlet 13 directly. The elastic diaphragm 14 is arranged to divide the duct 12 into an inlet side and a discharge side, wherein the inlet side is defined as the side where fuel enters in the direction of the oil inlet 13, and the discharge side is defined as the other side. In this embodiment, the fluid used is fuel, and in other embodiments, may be water or other fluids, including gases. A very small vent hole 141 is formed in the elastic diaphragm 14, and the vent hole 141 can be used to discharge gas overflowing from the fluid to the discharge side, and a very small amount of fluid can overflow from the vent hole 141 for lubrication. The provision of the vent 141 to achieve the above-described objects is well within the skill of those skilled in the art. Of course, in the present invention, when the fluid itself is a gas, the exhaust hole 141 is not provided.

Referring to fig. 4, a plug 15 is disposed in the hole 12, and the plug 15 is provided with external threads to be connected with internal threads formed in the hole 12, so that the plug 15 is fixed in the hole 12. A sealing ring 18 may further be provided between the plug 15 and the bore 12 for sealing. The plug 15 partially protrudes toward the elastic membrane 14 to form a pressing portion 150, so as to press the elastic membrane 14 against the receiving platform 110. The plug 15 is further provided with an accommodating groove 151, and the positioning convex column 113 can be accommodated in the accommodating groove 151, so that the pressing part 150 can be conveniently and accurately pressed against the elastic diaphragm 14. Inside the hole 12, when the plug 15 is pressed against the elastic membrane 14, there is a receiving space 16. As mentioned above, the receiving platform 110 is located on one side of the counterbore 115, the drop step 111 is located on the opposite side of the receiving platform 110, the drop step 111 slightly protrudes towards the receiving space 16 relative to the receiving platform 110, and has a certain height difference H (as shown in fig. 4), after the elastic diaphragm 14 is pressed against the receiving platform 110 by the pressing portion 150, due to the height difference H, the elastic diaphragm 14 and the drop step 111 have a certain pre-tightening force, so that the elastic diaphragm 14 can be ensured to close the oil inlet 13 (or the counterbore 115 in some embodiments). An inner ring containing groove 131 is formed inward at the position of the receiving platform 110 close to the positioning convex column 113, and the inner ring containing groove 131 can provide partial space when the elastic diaphragm 14 is partially bent towards the shell direction so as to facilitate the bending of the elastic diaphragm 14 and prevent stress concentration.

On one side of the receiving space 16, a drain hole 17 communicates, and in the present embodiment, the drain hole 17 further communicates with a tank or other oil return device.

Referring to fig. 5, in use, the elastic membrane 14 is positioned in the hole 12 by the positioning hole 142 and the positioning boss 113. However, the plug 15 is installed and tightened, so that the pressing portion 150 presses the elastic diaphragm 14 against the receiving platform 110, and a predetermined pre-tightening force is formed between the elastic diaphragm 14 and the step 111. In operation, fluid, in this embodiment fuel, is injected from the fuel metering unit into the counterbore 115, and when the pressure is insufficient to lift the diaphragm 14, the diaphragm 14 remains closed and gas can escape from the vent 141 to the receiving space 16, while fuel accumulates in the counterbore 115. When the fuel pressure is greater than the predetermined value, one side of the elastic diaphragm 14 away from the pressing portion 150 bends toward the inside of the accommodating space 16, so that a fluid passage is formed between the elastic diaphragm and the drop step 111, the inlet side communicates with the outlet side, and the fuel enters the accommodating space 16 and is discharged from the outlet hole 17. When the fuel pressure becomes lower, the elastic diaphragm 14 falls back to the drop step 111, and the oil inlet 13 is closed again, that is, the inlet side and the outlet side are separated again.

The elastic membrane can be made of plastic or metal according to the requirement and the fall of the fall step can be designed according to the requirement so as to adjust the difference of the pretightening force. Of course, in other embodiments, the plug may be omitted as long as the elastic diaphragm may press against and close the oil inlet.

According to the overflow control device, the overflow can be controlled through the arrangement of the plug and the elastic membrane, and the overflow control device is simple in structure. In addition, the shell and the pore passage are both formed by the pump shell and the pump pore passage which are arranged in the high-pressure pump, the structure is simple, and the occupied space is small.

The invention has been described in connection with only the presently preferred embodiment considered to be the most practical and preferred embodiment, and it is to be understood that the above description is not intended to limit the invention, nor is the invention limited to the above examples, but rather, is intended to cover within the spirit and scope of the invention variations, modifications, additions and substitutions that may be made by those skilled in the art.

Claims

1. The utility model provides an overflow subassembly (10), includes casing (11) and sets up in pore (12) in casing (11), pore (12) one end is connected with oil inlet (13), its characterized in that: an elastic diaphragm (14) is arranged in the pore passage (12) to seal the oil inlet (13), a plug (15) is arranged on the other side of the elastic diaphragm (14), the plug (15) is provided with a pressing part (150), the elastic diaphragm is pressed against the oil inlet (13) from one side of the elastic diaphragm (14), an accommodating space (16) is formed between the plug (15) and the elastic diaphragm (14), one side of the elastic diaphragm (14) which is not pressed by the pressing part (150) can be bent inwards towards the accommodating space (16), so that the oil inlet (13) is communicated with the accommodating space (16), the accommodating space (16) is further communicated with the drain hole (17), a bearing platform (110) is arranged on a shell on one side of the oil inlet (13), and the pressing part (150) is pressed against the bearing platform (110), a step (111) is provided on a housing portion facing the receiving platform (110), and the step (111) protrudes further into the receiving space (16) than the receiving platform (110).

2. Overflow assembly (10) according to claim 1, characterized in that said elastic membrane (14) is provided with an air vent (141), said oil inlet (13) being in air communication with said receiving space (16) through said air vent (141).

3. The spill assembly (10) of claim 1, wherein the receiving platform (110) has an outer ring defining a counterbore (115), the oil inlet (13) communicating with the counterbore (115).

4. The overflow assembly (10) of claim 1, wherein the housing (11) protrudes into the hole (12) to form a positioning boss (113), the plug (15) has a receiving groove (151) abutting against the positioning boss (113), the elastic membrane (14) has a positioning hole (142), and the positioning hole (142) can be positioned with the positioning boss (113).

5. The overflow assembly (10) of claim 4, wherein the receiving platform (110) is disposed around the positioning boss (113), and an inner annular receiving groove (131) is formed around the positioning boss (113) and in a direction toward the receiving platform (110).

6. Overflow assembly (10) according to claim 1, characterized in that said plug (15) is screwed to said channel (12).

7. Overflow assembly (10) according to claim 1, characterized in that a sealing ring (18) is arranged between the stopper (15) and the well (12).

8. A high-pressure pump (1), characterized in that the high-pressure pump (1) comprises a pump housing and a pump channel arranged in the pump housing, the pump housing and the pump channel being provided as a housing (11) and a channel (12) according to one of claims 1 to 7 to form an overflow assembly, the overflow assembly having the features according to one of claims 1 to 7.

9. The high-pressure pump (1) according to claim 8, characterized in that the oil inlet (13) communicates with a high-pressure pump fuel metering unit.

10. The high-pressure pump (1) as claimed in claim 8, characterized in that the drain opening (17) communicates with an oil tank of the high-pressure pump (1) or with a high-pressure pump return oil passage.