CN219570319U - High-pressure pump - Google Patents
High-pressure pump Download PDFInfo
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- CN219570319U CN219570319U CN202320663778.5U CN202320663778U CN219570319U CN 219570319 U CN219570319 U CN 219570319U CN 202320663778 U CN202320663778 U CN 202320663778U CN 219570319 U CN219570319 U CN 219570319U
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- groove
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Abstract
The utility model discloses a high-pressure pump, comprising: the device comprises a pressure cavity, a plunger sleeve arranged in the pressure cavity, and a plunger accommodated in the plunger sleeve, wherein the plunger is configured to reciprocate in the pressure cavity; the outer peripheral side wall of the plunger is provided with a pressure equalizing sealing groove, and a sealing ring is arranged in the pressure equalizing sealing groove; when the plunger is located the top dead center, the distance between the lower side of the pressure equalizing seal groove and the bottom of the plunger sleeve meets the following conditions:and the distance between the lower side surface of the pressure equalizing sealing groove and the bottom of the plunger sleeve when the plunger is positioned at the upper dead point is a single-side gap between the part with the largest diameter of the plunger and the plunger sleeve. According to the utility model, through the arrangement of the pressure equalizing sealing groove and the limitation on the position and the size of the pressure equalizing sealing groove, the possibility that oil cannot enter the unilateral gap can be reduced, the possibility of bubble generation is further reduced, and the plunger is protected.
Description
Technical Field
The utility model relates to the technical field of high-pressure pumps, in particular to a high-pressure pump.
Background
The high-pressure pump is a key part of a fuel direct injection engine, and converts low-pressure fuel into high-pressure fuel through the reciprocating linear motion of a plunger. Along with the continuous improvement of energy saving and emission reduction requirements, the design of the high-pressure pump is required to improve the oil pumping pressure on the premise of not losing the miniaturization, light weight and low cost. However, with the increase of pressure, the limitation of the load capacity of the camshaft requires the diameter of the plunger to be reduced, and the leakage amount caused by the single-side clearance of the plunger pair is correspondingly increased under high pressure, so that the pumping efficiency of the high-pressure pump at low rotation speed is extremely low; meanwhile, the lateral force caused by hydraulic pressure is correspondingly increased, and the risk of blocking in the running process of the plunger is further increased.
In order to solve the above problems, patent publication No. CN109219715a discloses a pump apparatus which functions to seal high-pressure oil and reduce leakage amount of a single-side gap during reciprocation of a plunger by opening a rectangular groove in the plunger and adding a seal ring thereto.
However, during actual use, the above-described technique still has the following drawbacks: (1) The sealing effect of the sealing ring tightly attached to the plunger pair ensures that the gasoline in the high-pressure area cannot leak to the low-pressure area, but on the other hand, the unilateral clearance of the plunger at the low-pressure side also loses the timely lubrication of the high-pressure oil; (2) When the high-pressure pump actually works, the plunger movement speed is high, the low-pressure area gasoline can not be filled into the single-side gap of the plunger, so that bubbles are generated in the single-side gap of the low-pressure side, cavitation is caused by bubble generation-collapse circulation, irreversible damage can be generated to parts, the end face of the sealing ring is seriously worn, the sealing effect is lost, the lubrication of the matched movement of the plunger and the plunger sleeve is seriously affected, and the plunger is further blocked.
Disclosure of Invention
In order to solve the above problems, the present utility model provides a high-pressure pump.
An embodiment of the present utility model provides a high-pressure pump including:
a pressure chamber, a plunger sleeve disposed in the pressure chamber, a plunger housed within the plunger sleeve, the plunger configured to reciprocate within the pressure chamber;
the outer peripheral side wall of the plunger is provided with a pressure equalizing sealing groove, and a sealing ring is arranged in the pressure equalizing sealing groove;
when the plunger is located at the top dead center, the distance between the lower side face of the pressure equalizing sealing groove and the bottom of the plunger sleeve meets the following conditions:
the plunger is positioned at the upper dead point, the lower side face of the pressure equalizing sealing groove is away from the bottom of the plunger sleeve, and the part with the largest diameter of the plunger is a unilateral gap between the part with the largest diameter of the plunger and the plunger sleeve;
the upper dead center is the position of the plunger in the maximum lift, the bottom of the plunger sleeve refers to the end face of the plunger sleeve away from the bottom of the pressure cavity, and the lower side face of the pressure equalizing sealing groove refers to the inner side face of the pressure equalizing sealing groove away from the bottom of the pressure cavity.
In some embodiments, the peripheral side wall of the sealing ring is abutted against the inner side wall of the plunger sleeve, and the lower side surface of the sealing ring is abutted against the lower side surface of the pressure equalizing sealing groove;
the lower side of the sealing ring refers to the side of the sealing ring away from the cavity bottom of the pressure cavity.
In some embodiments, the pressure equalization seal groove is a rectangular pressure equalization seal groove.
In some embodiments, the plunger sleeve is cylindrically configured.
In some embodiments, the size of the unilateral gap between the largest diameter portion of the plunger and the plunger sleeve is 5-10 μm.
In some embodiments, the pressure equalization seal groove is sized to:
the plunger piston is characterized in that Y is the distance between the upper side face of the pressure equalizing sealing groove and the top of the plunger piston sleeve when the plunger piston is located at the top dead center, H is the height of the pressure equalizing sealing groove, T is the depth of the pressure equalizing sealing groove, and D is the maximum diameter of the plunger piston.
In some embodiments, the sealing ring divides the pressure cavity into a high pressure area and a low pressure area, and a triangular pressure equalizing groove is further formed in the outer circumferential side wall of the plunger, and the triangular pressure equalizing groove is located in the high pressure area.
In some embodiments, the triangular equalization grooves are positioned to satisfy:
wherein, M is the distance between the upper end of the triangular equalizing groove and the top of the plunger sleeve when the plunger is positioned at the upper dead point; the N is the distance between the lower end of the triangular pressure equalizing groove and the upper side surface of the pressure equalizing sealing groove when the plunger is positioned at the upper dead point;
the upper end of the triangular pressure equalizing groove refers to one end of the triangular pressure equalizing groove, which is close to the bottom of the pressure cavity.
The technical scheme of the utility model at least comprises the following advantages:
1. the plunger is provided with the pressure equalizing sealing groove, the size of the pressure equalizing sealing groove is specifically limited, the possibility that oil cannot enter the unilateral gap is reduced, the possibility of bubble generation is further reduced, and the plunger is protected;
2. through seting up of triangle pressure equalizing groove, at plunger in-process that goes upward, triangle pressure equalizing groove plays the pressure equalizing and centering effect, is favorable to the quick location of sealing ring and load to equip, has reduced the possibility that the plunger takes place the slope.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present utility model, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic illustration of a high pressure pump provided in accordance with an exemplary embodiment of the present utility model;
FIG. 2 is an enlarged view of portion A of FIG. 1, provided in accordance with an exemplary embodiment of the present utility model;
fig. 3 is a comparison of a high pressure pump with plungers at top dead center and bottom dead center, respectively, according to an exemplary embodiment of the present utility model.
Reference numerals illustrate: 1. a pressure chamber; 11. a high pressure region; 12. a low pressure zone; 2. a plunger sleeve; 3. a plunger; 31. pressure equalizing seal groove; 32. a triangular equalizing groove; 4. and (3) a sealing ring.
Detailed Description
The following description of the embodiments of the present utility model will be made more apparent and fully hereinafter with reference to the accompanying drawings, in which some, but not all embodiments of the utility model are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
In the description of the present utility model, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present utility model, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present utility model will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present utility model described below may be combined with each other as long as they do not collide with each other.
The embodiment of the utility model provides a high-pressure pump, referring to fig. 1, the high-pressure pump comprises a pressure cavity 1, a plunger sleeve 2 is installed in the pressure cavity 1, and in the embodiment, the plunger sleeve 2 is in a cylindrical shape. The plunger sleeve 2 accommodates a plunger 3 therein, and the plunger 3 is reciprocable in the pressure chamber 1 by a drive member of the high-pressure pump. The plunger 3 comprises several sections of different diameters, and the section with the largest diameter is the working part of the plunger 3. An annular pressure equalizing seal groove 31 is formed in the outer peripheral side wall of the working portion of the plunger 3, and the pressure equalizing seal groove 31 may be a rectangular groove having a rectangular cross section, for example.
Referring to fig. 1-2, a sealing ring 4 is sleeved in the pressure equalizing sealing groove 31, the peripheral side wall of the sealing ring 4 is clung to the inner side wall of the plunger sleeve 2, and the lower side surface of the sealing ring 4 is clung to the lower side surface of the pressure equalizing sealing groove 31, so that a sealing effect is realized. The seal ring 4 divides the pressure chamber 1 into a high pressure region 11 and a low pressure region 12, wherein the high pressure region 11 is a portion above the seal ring 4 and the low pressure region 12 is a portion below the seal ring 4.
In some embodiments, the seal ring 4 and the pressure equalizing seal groove 31 may also be in interference fit, so that the seal effect can be further improved although the wear of the seal ring 4 is larger, and the seal effect can be specifically selected based on actual requirements.
Referring to fig. 1-3, there is a gap between the working portion of the plunger 3 and the inside wall of the plunger sleeve 2, and the single-sided gap is greater than 3 μm. In the utility model, in order to avoid cavitation of the unilateral gap, the flow rate of the oil passing through the unilateral gap in a cylindrical ring shape needs to be larger than the volume of the unilateral gap, namely the following conditions need to be satisfied:
referring to fig. 3, the left side view is a schematic view of the high-pressure pump in which the plunger 3 is located at the top dead center, that is, the plunger 3 is located at the maximum lift, and the right side view is a schematic view of the high-pressure pump in which the plunger 3 is located at the bottom dead center. In the above formula, X is the distance between the lower side surface of the pressure equalizing seal groove 31 and the bottom of the plunger sleeve 2, and a is the single-side gap between the portion with the largest diameter of the plunger 3 and the plunger sleeve 2.
Meanwhile, in order to ensure that the sealing ring 4 can have a sealing effect, referring to fig. 3, when the plunger 3 is located at the top dead center, the distance X between the lower side surface of the pressure equalizing sealing groove 31 and the bottom of the plunger sleeve 2 needs to satisfy L < X, where L is the maximum lift of the plunger 3.
Referring to fig. 3, when the plunger 3 is at the top dead center, the greatest lateral force is received, and at the same time, the pressure equalizing seal groove 31 weakens the rigidity of the plunger 3, so that, in order to ensure the overall strength of the plunger 3, the following conditions are also satisfied by the dimensions:
referring to fig. 3, y is the distance from the upper side of the pressure equalizing seal groove 31 to the top of the plunger sleeve 2 when the plunger 3 is at the top dead center, H is the height of the pressure equalizing seal groove 31, T is the depth of the pressure equalizing seal groove 31, and D is the diameter of the working portion of the plunger 3, that is, the maximum diameter of the plunger 3.
Referring to fig. 1 to 3, a triangular pressure equalizing groove 32 is further formed in the outer peripheral side wall of the plunger 3, and the triangular pressure equalizing groove 32 is located in the high pressure region 11 above the pressure equalizing seal groove 31. In the ascending process of the plunger 3, the triangular equalizing grooves 32 have equalizing and centering effects, are favorable for quick positioning and load equalizing of the sealing ring 4, and reduce the possibility of tilting of the plunger 3.
1-3, to ensure the equalization effect of the triangular equalization tank 32, the location of the triangular equalization tank 32 satisfies the following conditions:
wherein M is the distance between the upper end of the triangular equalizing groove and the top of the plunger sleeve 2 when the plunger 3 is positioned at the upper dead point; n is the distance between the lower end of the triangular equalizing groove 32 and the upper side of the equalizing seal groove 31 when the plunger 3 is at the top dead center.
According to the technical scheme, on one hand, the possibility that oil cannot enter the unilateral gap can be reduced through the arrangement of the pressure equalizing sealing groove 31 and the limitation of the position and the size of the pressure equalizing sealing groove 31, so that the possibility of bubble generation is reduced, and the plunger 3 is protected. On the other hand, the utility model has the advantages that the triangular pressure equalizing grooves 32 play a role in pressure equalizing and centering in the ascending process of the plunger 3 through the opening of the triangular pressure equalizing grooves 32 and the limitation on the positions of the triangular pressure equalizing grooves 32, thereby being beneficial to the rapid positioning and load sharing of the sealing ring 4 and reducing the possibility of the inclination of the plunger 3.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the utility model.
Claims (8)
1. A high pressure pump comprising a pressure chamber (1), a plunger sleeve (2) arranged in the pressure chamber (1), a plunger (3) accommodated within the plunger sleeve (2), the plunger (3) being configured to reciprocate within the pressure chamber (1); the method is characterized in that:
a pressure equalizing sealing groove (31) is formed in the peripheral side wall of the plunger (3), and a sealing ring (4) is arranged in the pressure equalizing sealing groove (31);
when the plunger (3) is positioned at the top dead center, the distance between the lower side surface of the pressure equalizing sealing groove (31) and the bottom of the plunger sleeve is as follows:
the L is the maximum lift of the plunger (3), the X is the distance between the lower side surface of the pressure equalizing sealing groove (31) and the bottom of the plunger sleeve when the plunger (3) is positioned at the top dead center, and the a is the unilateral gap between the part with the largest diameter of the plunger (3) and the plunger sleeve (2);
the upper dead center is the position of the plunger (3) in the maximum lift, the bottom of the plunger sleeve refers to the end face of the plunger sleeve (2) away from the bottom of the pressure cavity (1), and the lower side face of the pressure equalizing sealing groove (31) refers to the inner side face of the pressure equalizing sealing groove (31) away from the bottom of the pressure cavity (1).
2. The high-pressure pump according to claim 1, characterized in that the peripheral side wall of the sealing ring (4) is in close contact with the inner side wall of the plunger sleeve (2), and the lower side surface of the sealing ring is in close contact with the lower side surface of the pressure equalizing sealing groove (31);
the lower side of the sealing ring (4) refers to the side of the sealing ring (4) away from the cavity bottom of the pressure cavity (1).
3. The high-pressure pump according to claim 1, characterized in that the pressure equalization seal groove (31) is a rectangular pressure equalization seal groove.
4. A high-pressure pump according to claim 1, characterized in that the plunger sleeve (2) is arranged cylindrically.
5. High-pressure pump according to claim 1, characterized in that the unilateral gap between the portion of greatest diameter of the plunger (3) and the plunger sleeve (2) is greater than 3 μm.
6. The high-pressure pump according to claim 1, characterized in that the dimensions of the pressure equalizing seal groove (31) satisfy:
when the plunger (3) is located at the top dead center, the upper side face of the pressure equalizing sealing groove (31) is away from the top of the plunger sleeve (2), H is the height of the pressure equalizing sealing groove (31), T is the depth of the pressure equalizing sealing groove (31), and D is the maximum diameter of the plunger (3).
7. The high-pressure pump according to claim 1, characterized in that the sealing ring (4) divides the pressure chamber (1) into a high-pressure area (11) and a low-pressure area (12), and a triangular pressure equalizing groove (32) is further formed in the outer peripheral side wall of the plunger, and the triangular pressure equalizing groove (32) is located in the high-pressure area.
8. The high-pressure pump according to claim 7, characterized in that the position of the triangular equalizing groove (32) satisfies:
wherein M is the distance between the upper end of the triangular equalizing groove (32) and the top of the plunger sleeve (2) when the plunger (3) is positioned at the top dead center; the N is the distance between the lower end of the triangular pressure equalizing groove (32) and the upper side surface of the pressure equalizing sealing groove (31) when the plunger (3) is positioned at the upper dead point;
the upper end of the triangular pressure equalizing groove (32) is one end of the triangular pressure equalizing groove (32) close to the bottom of the pressure cavity (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320663778.5U CN219570319U (en) | 2023-03-29 | 2023-03-29 | High-pressure pump |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320663778.5U CN219570319U (en) | 2023-03-29 | 2023-03-29 | High-pressure pump |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219570319U true CN219570319U (en) | 2023-08-22 |
Family
ID=87646992
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320663778.5U Active CN219570319U (en) | 2023-03-29 | 2023-03-29 | High-pressure pump |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219570319U (en) |
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2023
- 2023-03-29 CN CN202320663778.5U patent/CN219570319U/en active Active
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