CN218440854U

CN218440854U - Three-level opening overflow valve

Info

Publication number: CN218440854U
Application number: CN202222086288.1U
Authority: CN
Inventors: 高展; 潘慧; 解芳; 奚阳; 于建锋; 臧广辉; 李世明; 于春朝; 白阳
Original assignee: Junfeng Electronic Control Technology Dalian Co ltd
Current assignee: Junfeng Electronic Control Technology Dalian Co ltd
Priority date: 2022-08-09
Filing date: 2022-08-09
Publication date: 2023-02-03
Anticipated expiration: 2032-08-09

Abstract

The invention discloses a three-level opening overflow valve which comprises a valve body, wherein a valve core, a spring and a steel ball are arranged in the valve body from inside to outside, the steel ball is in linear contact sealing with the rear end of the valve body, a first-level flow hole is formed in the middle of the valve core, a third-level flow hole is formed in the side face of the valve core, a second-level flow hole is formed in the front end of the valve body, an outflow hole is formed in the side face of the valve body, the first-level flow hole is opened after diesel oil enters through the valve core and forms valve front pressure in front of the first-level flow hole, the first-level flow hole is opened, the first-level flow flows out through the outflow hole, the valve core continuously moves upwards along with the rising of the valve front pressure under the pretightening force of the spring, so that the second-level flow hole and the third-level flow hole are sequentially opened, a first sealing element and a second sealing element are arranged outside the valve body to divide the second-level flow, the first-level flow and the third-level flow seals, and the first-level flow are respectively formed after the first-level flow hole, the second-level flow hole and the third-level flow hole are opened.

Description

Three-level opening overflow valve

Technical Field

The application relates to the technical field of high-pressure common rail fuel injection systems, in particular to a three-level opening overflow valve.

Background

The overflow valve is a hydraulic flow control valve, and the flow of fluid is controlled by the opening or non-opening of different flow holes in hydraulic equipment.

At the beginning stage of low flow, effective pressure is difficult to form in front of the valve due to overlarge leakage flow; and when the flow rate fluctuates, the pressure in front of the valve is difficult to keep stable. In some special cases, a linear relationship between pressure and flow is also required. According to the traditional three-level opening overflow valve, the primary flow is often formed by leakage of a gap between a valve core and a valve body, the interference of the primary flow on the pressure before the valve is difficult to generate due to the undersize of the primary flow, and the flow and the pressure before the valve are not in a linear relation due to the change of the matching length of the valve body and the valve core.

Disclosure of Invention

To the problem that prior art exists, the purpose of this application embodiment is to provide a three-level overflow valve of opening, controls flow through 3 flow holes of different apertures altogether on disk seat and the case to make the oil feed of high pressure common rail oil pump measure the pre-valve pressure and flow and all reach ideal state.

According to the first aspect of the embodiment of the application, the overflow valve with the three-level opening function is provided, and comprises a valve body, wherein a valve core, a spring and a steel ball are installed in the valve body from inside to outside, the steel ball is in linear contact sealing with the rear end of the valve body, a first-level flow hole is formed in the middle of the valve core, a third-level flow hole is formed in the side face of the valve core, a second-level flow hole is formed in the front end of the valve body, a flow outlet is formed in the side face of the valve body, after diesel oil enters the valve core and forms valve head pressure in front of the first-level flow hole, the first-level flow hole is opened, the first-level flow passes through the flow outlet, the spring is pre-tensioned, the valve core moves upwards continuously along with rising of the valve head pressure, so that the second-level flow hole and the third-level flow hole are opened sequentially, a first sealing element and a second sealing element are arranged outside the valve body to divide the second-level flow, the first-level flow hole and the third-level flow hole into a flow hole.

Further, the first sealing element comprises a first sealing groove and a first O-shaped sealing ring which are tightly matched.

Further, the second sealing element comprises a second sealing groove and a second O-shaped sealing ring which are tightly matched.

Furthermore, the front end of the valve body is provided with a filter screen, and an inlet liquid path is sealed with the secondary flow through end face sealing.

The technical scheme provided by the embodiment of the application can have the following beneficial effects:

according to the embodiment, the first-stage flow hole is arranged in the device 1), so that stable pressure can be built in front of the valve in a small flow section, and the operation of the engine in an idling state is facilitated; 2) The three-stage flow holes are arranged, so that the pressure can be kept stable under the condition of large flow fluctuation during large flow; 3) The flow of each stage of the changed overflow valve is only related to the pressure before the valve and the aperture of the flow hole, and the control between the pressure and the flow is linear; 4) Compared with a ball valve, the size of the hydraulic section of the changed overflow valve is not influenced by the lift of the valve core, and is only related to the shape of the valve core, so that the hydraulic stress is uniform and the consistency is good.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.

FIG. 1 is a cross-sectional view of a three-level open spill valve shown in accordance with an exemplary embodiment.

FIG. 2 is a cross-sectional view of a valve body shown according to an exemplary embodiment.

FIG. 3 is a cross-sectional view of a valve cartridge shown in accordance with an exemplary embodiment.

In the figure:

1. a valve body; 11. a secondary flow orifice; 12. an outflow hole; 13. a first seal groove; 14. a second seal groove; 2. a steel ball; 3. A valve core; 31. a tertiary flow orifice; 32. a primary flow orifice; 4. a spring; 5. a second O-ring seal; 6. a first O-ring seal;

Detailed Description

Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. The following description refers to the accompanying drawings in which the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary examples do not represent all implementations consistent with the present application. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present application, as detailed in the appended claims.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It should also be understood that the term "and/or" as used herein refers to and encompasses any and all possible combinations of one or more of the associated listed items.

It should be understood that although the terms first, second, third, etc. may be used herein to describe various information, such information should not be limited to these terms. These terms are only used to distinguish one type of information from another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present application. The word "if," as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination," depending on the context.

Fig. 1 is a cross-sectional view of a three-level opening overflow valve according to an exemplary embodiment, as shown in fig. 1, the three-level opening overflow valve may include a valve body 1, a valve element 3, a spring 4 and a steel ball 2 are installed in the valve body 1 from inside to outside, the steel ball 2 is in linear contact sealing with a rear end of the valve body 1, a first-level flow hole 32 is opened in the middle of the valve element 3, and a third-level flow hole 31 is opened in a side surface of the valve element 3, a second-level flow hole 11 is opened in a front end of the valve body 1, and a flow outlet 12 is opened in a side surface of the valve body 1, after diesel oil enters through the valve element 3 and forms a pre-valve pressure in front of the first-level flow hole 32, the first-level flow hole 32 is opened, the first-level flow flows out through the flow outlet 12, under a pre-tightening force of the spring 4, the valve element 3 continuously moves up to sequentially open the second-level flow hole 11 and the third-level flow hole 31, and a first sealing element and a second sealing element are provided outside the valve body 1 to divide the second-level flow hole, the first-level flow hole, the third-level flow hole, the second flow hole, the third-level flow hole, and the third flow hole 31, respectively, and the first-level flow hole form a third flow hole.

During assembly, the valve core 3, the spring 4 and the steel ball 2 are sequentially placed into the valve body 1 from the tail part, and the valve core 3 is clamped on the sealing section. According to the opening pressure required by the working condition, the steel ball 2 is pressed into the specified depth by using a special tool, which is set as a conventional assembly mode in the field and is not described herein.

Specifically, the first sealing element comprises a first sealing groove 13 and a first O-shaped sealing ring 6 which are tightly matched, so that the secondary flow flowing out of the secondary flow hole 11 and the primary and tertiary flows flowing out of the outflow hole 12 form sealing; the second sealing element comprises a second sealing groove 14 and a second O-shaped sealing ring 5 which are tightly matched, so that the outflow hole 12 is sealed with the outside, and the oil pump is ensured not to leak. During assembly, the first O-shaped sealing ring 6 is arranged in the first sealing groove 13, and the second O-shaped sealing ring 5 is arranged in the second sealing groove 14.

In the specific implementation, the front end of the valve body 1 is provided with a secondary flow hole 11, and the small flow of the secondary flow hole can be used for lubricating a bearing bush of a high-pressure oil pump; the middle part is an outflow hole 12, the first-level flow and the third-level flow from the outflow hole 12 to the oil return position of the pump, the rear end is in linear contact sealing with the steel ball 2, and the middle part is provided with a step to realize end face sealing with the valve core 3. An external thread is arranged outside the valve body 1 to install the overflow valve to a high-pressure oil pump body. A first sealing groove 13 and a second sealing groove 14 are arranged outside the valve body 1, and the secondary flow and the primary and tertiary flows are hermetically divided. Wherein the secondary flow also includes the flow leaked by the slide valve structure.

Specifically, the valve body 1 is in contact seal with the end face of the high-pressure oil pump to seal the secondary flow with diesel oil in front of the overflow valve.

In specific implementation, the spring 4 can select appropriate materials, effective turns, free length, compression length, spring 4 pitch diameter and other parameters according to actual conditions, so that the relief valve can reach the expected opening pressure.

According to the overflow valve opened at the three levels, the three-level pressure regulation refers to that three levels of flow respectively enter the pressure relief from three different flow regulation holes along with the increase of the pressure in front of the valve, and the three flow regulation holes are not interfered with each other, so that the pressure fluctuation of high-pressure fuel is reduced.

The first-stage pressure regulation means that when the overflow valve starts to work, diesel oil enters the overflow valve from the middle of the valve core 3, a pre-valve pressure is formed in front of the first-stage flow hole 32 on the valve core 3, the first-stage flow of the overflow valve is opened, and the diesel oil flows out of the outflow hole 12 and returns to the inlet of the oil transfer pump again through the first-stage flow hole 32 and a gap between the valve body 1 and the valve core 3. Because the aperture of the primary flow hole 32 is extremely small, and throttling pressure difference is formed at two ends of the primary flow hole 32, the primary flow is small, the opening of an overflow valve is not influenced, and the primary flow hole is applied to a small flow section.

The second stage pressure adjustment means that, as the pressure before the valve continues to increase, when the pressure is greater than the back pressure plus the pretightening force of the spring 4, the valve core 3 moves upwards, the elastic force provided by the spring 4 increases, and a dynamic balance state is achieved. When the valve core 3 rises to the secondary flow hole 11, the secondary flow is started to supply oil to the lubricating oil path of the high-pressure oil pump.

The third stage pressure adjustment means that the pressure before the valve is continuously increased, the valve core 3 is continuously moved upwards, and when the third stage flow hole 31 is opened, the third stage flow returns to the inlet of the oil transfer pump again through the outflow hole 12, so that the third stage flow can cope with the change of the large flow.

Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains.

It will be understood that the present application is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A three-level opening overflow valve is characterized by comprising a valve body, wherein a valve core, a spring and a steel ball are arranged in the valve body from inside to outside, the steel ball is in linear contact sealing with the rear end of the valve body, a first-level flow hole is formed in the middle of the valve core, a third-level flow hole is formed in the side face of the valve core, a second-level flow hole is formed in the front end of the valve body, a flow outlet is formed in the side face of the valve body, the first-level flow hole is opened after diesel oil enters the valve core through the valve core and forms valve front pressure in front of the first-level flow hole, the first-level flow hole is opened, the first-level flow flows out through the flow outlet, the valve core continuously moves upwards along with the rising of the valve front pressure under the pretightening force of the spring, so that the second-level flow hole and the third-level flow hole are sequentially opened, a first sealing element and a second sealing element are arranged outside the valve body to hermetically shunt the second-level flow, the first-level flow hole and the third-level flow hole, and the first-level flow hole are respectively formed after the first-level flow hole, the second-level flow hole and the third-level flow hole are opened.

2. The three-stage opening overflow valve of claim 1, wherein the first sealing element comprises a first sealing groove and a first O-shaped sealing ring which are tightly matched.

3. The three-level opening overflow valve of claim 1, wherein the second seal comprises a second seal groove and a second O-ring which are tightly fitted.

4. The three-level opening overflow valve according to claim 1, wherein a filter screen is arranged at the front end of the valve body, and the inlet liquid path is sealed with the secondary flow rate through end face sealing.