CN212744191U

CN212744191U - Overflow valve with two-stage opening pressure to control flow

Info

Publication number: CN212744191U
Application number: CN201922463145.6U
Authority: CN
Inventors: 谭江学; 欧阳玲湘; 邓飞; 龙美彪; 黄民备; 谭四喜
Original assignee: Nanyuediankong Hengyang Industrial Technology Co ltd
Current assignee: Nanyuediankong Hengyang Industrial Technology Co ltd
Priority date: 2019-12-31
Filing date: 2019-12-31
Publication date: 2021-03-19
Anticipated expiration: 2029-12-31

Abstract

The utility model discloses an overflow valve device with two-stage opening pressure control flow for a high-pressure common rail fuel injection system, which comprises a valve core, an overflow valve body, a retainer ring, an overflow valve sealing ring, a pressure regulating spring and a steel ball; the oil pressure in the high-pressure common rail is effectively balanced by adopting a primary oil return mode and a secondary oil return mode of the valve core. The valve core and the overflow valve body are matched by adopting a small gap, so that return oil leakage is prevented, and the unstable pressure of the fuel in the common rail is avoided. The valve core is provided with a lubricating oil groove, so that the movement lubricity of the valve core and the valve body of the overflow valve is increased, and the reliability of the overflow valve can be greatly improved. The mode that the check ring prevents fixing the valve core ensures that the valve core does not slip when the overflow valve body moves. Therefore, the pressure and the flow in the high-pressure oil rail are balanced, and the stability, the consistency, the silence and the reliability of the diesel engine provided with the high-pressure common rail fuel injection system are better exerted in the running process.

Description

Overflow valve with two-stage opening pressure to control flow

Technical Field

The utility model discloses a relief valve device that is used for high pressure common rail fuel injection system to open pressure control flow through the second grade.

Background

The overflow valve device for controlling the flow rate of a fuel injection system through secondary opening pressure at present mainly comprises an overflow valve matching part, a pressure regulating spring, a check ring, an overflow valve sealing ring, a steel ball and other parts. The pressure regulating spring and the steel ball are used for regulating the opening pressure of the safety overflow valve. The overflow valve assembly comprises an overflow valve body and a valve core, wherein the outer circle of the valve core and the inner hole of the overflow valve body are in small clearance matching, friction damage is easily generated in the up-and-down movement process, and pressure and flow in a high-pressure oil rail are unstable, so that the diesel engine provided with the high-pressure common rail fuel injection system is poor in stability, consistency, silence and reliability in the operation process.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that the above-mentioned technical problem that exists to current overflow valve device and provide an overflow valve device of pressure control flow is opened to the second grade, controls pressure and flow in the high-pressure oil rail.

The utility model discloses the technical problem that will solve can realize through following technical scheme:

an overflow valve with flow controlled by two-stage opening pressure comprises an overflow valve body, a valve core, a pressure regulating spring and a steel ball, wherein an overflow valve body oil return cavity, a valve core hole and a first oil inlet inner hole which are coaxial are arranged in the overflow valve body; an oil injection hole and a second oil inlet inner hole are coaxially arranged in the valve core, and the oil injection hole is communicated with the second oil inlet inner hole; a steel ball and a pressure regulating spring are assembled in the oil return cavity of the overflow valve body, and the pressure regulating spring is positioned between the steel ball and the upper end of the valve core; the overflow valve is characterized in that two-stage radial oil outlet is arranged on the valve core at intervals along the axis direction of the valve core, at least one first radial oil outlet hole is formed in the middle of the overflow valve body, two-stage oil return is formed between the first radial oil outlet hole in the overflow valve body and the two-stage radial oil outlet of the valve core, and the size of each stage of oil return changes from one-stage oil return hole to two-stage oil return holes along with the change of the lift range of the valve core.

In the utility model discloses a preferred embodiment, the radial oil production of two-stage on the case divide into the radial oil production of first order and the radial oil production of second level, the radial oil production of first order is located the below that radially produces oil of second level.

The utility model discloses a preferred embodiment, every grade of radial oil outlet on the case is equipped with 2 ~ 3 second oil outlet, and these 2 ~ 3 second oil outlets are located same radial plane and are the circumference on this same radial plane and distribute.

In the utility model discloses a preferred embodiment, the first radial oil outlet is two, and two first radial oil outlets are located same radial plane and are the circumference on this same radial plane and distribute.

In a preferred embodiment of the utility model, because the valve core excircle is selected with the little clearance in the valve core hole of the overflow valve body, the friction damage is easy to generate in the up-and-down movement process, the excircle of the valve core is provided with a lubricating oil groove which is positioned below the second-stage radial oil outlet; and an oil inlet hole is formed in the position, corresponding to the lubricating oil groove, of the overflow valve body, and the oil inlet hole is communicated with the lubricating oil groove. Fuel oil enters a lubricating oil groove of the outer circle of the valve core through an oil inlet hole in the overflow valve body, and the outer circle of the valve core and the valve core hole of the overflow valve body can be effectively lubricated, so that abrasion of the outer circle of the valve core in the reciprocating motion of the valve core hole of the overflow valve body is prevented.

The utility model discloses a preferred embodiment be provided with a retaining ring groove on the case a retaining ring is gone into to the retaining ring inslot card, and the retaining ring blocks the case, and the fuel oil return in-process case up-and-down motion in the valve body, retaining ring block the case and can effectively prevent the case slippage when overflow valve body downstream.

The utility model discloses a preferred embodiment be provided with the seal ring groove on the excircle of overflow valve body, the seal ring groove is located the top of first radial oil outlet the interior overflow valve sealing washer that is equipped with of seal ring groove. The overflow valve sealing ring is assembled on the outer circle of the overflow valve body, and radial sealing is adopted to prevent fuel oil return from leaking, so that the fuel oil return is ensured to return to a low-pressure oil way of the diesel engine oil through the first radial oil outlet hole on the overflow valve body.

The utility model discloses a preferred embodiment be provided with the external screw thread on the excircle of overflow valve body, the external screw thread is located the below of first radial oil outlet with the top of inlet port scribbles thread sealing glue in the external screw thread department.

Due to the adoption of the technical scheme, the utility model discloses the oil return pressure device who opens the fuel oil return that comprises steel ball and pressure regulating spring. The steel ball controls the pressure of the pressure regulating spring through pressing the depth of an oil return cavity of the overflow valve body, so that the opening pressure of fuel oil return is controlled.

The utility model has two stages of radial oil outlet at different distances on the valve core, and each stage of radial oil outlet is provided with 2-3 second radial oil outlet holes; the overflow valve body is also provided with a first radial oil outlet hole, two-stage fuel oil return is formed between the first radial oil outlet hole and two-stage radial oil outlet on the valve core, and the size of the oil return amount changes from first-stage oil return to second-stage oil return along with the change of the lift range of the valve core.

Overflow valve device compact structure of pressure control flow is opened to second grade, pressure and flow in can the simultaneous control high pressure oil rail realize both to reach the balance to let diesel engine who is equipped with high pressure common rail fuel injection system at operation in-process stationarity, uniformity, silence nature, reliability performance better.

Drawings

Fig. 1 is a front view of the cross section of the overflow valve device of the present invention.

Fig. 2 is the utility model discloses the overflow valve device reaches the section view of one-level oil return.

Fig. 3 is the utility model discloses the overflow valve device reaches the section view of second grade oil return.

Detailed Description

In order to make the technical means, creation features, achievement purposes and functions of the present invention easy to understand and understand, the present invention is further explained by combining with the specific drawings.

Referring to fig. 1 to 3, the relief valve device with two-stage opening pressure to control flow rate is shown, which comprises a valve core 110, a relief valve body 100, a retainer ring 120, a relief valve seal ring 130, a pressure regulating spring 140 and a steel ball 150.

The valve core 110 is provided with a second oil inlet inner hole 170, an oil injection hole 171, a plurality of first-stage second radial oil outlet holes 180, a plurality of second-stage second radial oil outlet holes 190, a lubricating oil groove 210 and a retainer groove 121; the injection hole 171 communicates with the second oil inlet bore 170. The plurality of first-stage second radial oil outlet holes 180 are located on the same radial plane and are circumferentially distributed on the same radial plane to form first-stage radial oil outlet on the valve core 110, the plurality of second-stage second radial oil outlet holes 190 are located on the same radial plane and are circumferentially distributed on the same radial plane to form second-stage radial oil outlet on the valve core 110, and the first-stage radial oil outlet is located above the second-stage radial oil outlet. The lubrication groove 210 is located below the second stage radial oil outlet.

The overflow valve body 100 is provided with a first oil inlet inner hole 160, two oil inlet holes 220 leading to a lubricating oil groove 210 on the valve core 110, a valve core hole 111, two first radial oil outlet holes 200, an overflow valve body oil return cavity 230, a seal ring groove 131 and an external thread 101. The overflow valve body oil return cavity 230, the valve core hole 111 and the first oil inlet inner hole 160 are coaxially arranged and are sequentially communicated. The two first radial oil outlet holes 200 are located on the same radial plane at the middle position of the overflow valve body 100 and are distributed circumferentially on the same radial plane. The seal ring groove 131 and the external thread 101 are respectively positioned above and below the two first radial oil outlet holes 200. The two oil inlet holes 220 are located on the same radial plane below the external thread 101 and are circumferentially distributed on the same radial plane.

The outer circle of the valve core 110 is matched with the valve core hole 111 on the overflow valve body 100 in a close clearance mode, and fuel enters the second oil inlet inner hole 170 of the valve core 110 from the first oil inlet inner hole 160 on the overflow valve body 100; the return pressure rises, the valve core 110 moves upwards to compress the pressure regulating spring 140, and the valve core enters a primary oil return state (shown in fig. 2), at this time, the fuel enters the overflow valve body return cavity 230 from the second oil inlet inner hole 170 on the valve core 110 through the primary second radial oil outlet hole 180, and the fuel in the overflow valve body return cavity 230 returns to the low-pressure oil path through the two first radial oil outlet holes 200 on the overflow valve body 100. The return pressure continues to rise, the valve core 110 continues to go up to compress the pressure regulating spring 140, the two-stage oil return state is entered, the fuel enters the overflow valve body oil return cavity 230 from the second oil inlet inner hole 170 on the valve core through the first-stage second radial oil outlet hole 180 and the second-stage second radial oil outlet hole 190, and the fuel in the overflow valve body oil return cavity 230 returns to the low-pressure oil path through the two first radial oil outlet holes 200 on the overflow valve body 100. The return oil pressure is reduced, the pressure regulating spring 140 rebounds back to the valve core 110 to close the second radial oil outlet hole 190, the return oil pressure continues to be reduced, and the pressure regulating spring 140 rebounds back to the valve core 110 further to close the first radial oil outlet hole 180. The retainer ring 120 is caught in the retainer groove 121 to retain the valve element 110, and prevent the valve element 110 from being separated from the relief valve body 100.

The overflow valve body 100 is coated with a uniform thread sealing glue at the external thread 101 so as to isolate fuel oil inlet and fuel oil return. Relief valve seal 130 is mounted in seal groove 131 and radially seals against a mounting body (not shown) to prevent return leakage.

In the process that the valve core 110 reciprocates in the valve core hole 111 of the overflow valve body 100, fuel flows to the lubricating oil groove 210 on the valve core 110 through the two oil inlet holes 220 on the overflow valve body 100, so that the contact surface of the valve core 110 and the valve core hole 111 of the overflow valve body 100 can be effectively lubricated, and the fatigue wear of the outer circle of the valve core 110 and the valve core hole 111 of the overflow valve body 100 is prevented.

Therefore, the pressure and the flow of the fuel in the high-pressure fuel rail can be controlled, the balance between the pressure and the flow is realized, and the stability, the consistency, the silence and the reliability of the diesel engine provided with the high-pressure common rail fuel injection system are better exerted in the operation process.

The foregoing shows and describes the general principles, essential features, and advantages of the invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only illustrative of the structural principle of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the present invention, and these changes and modifications fall within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. An overflow valve with flow controlled by two-stage opening pressure comprises an overflow valve body, a valve core, a pressure regulating spring and a steel ball, wherein an overflow valve body oil return cavity, a valve core hole and a first oil inlet inner hole which are coaxial are arranged in the overflow valve body; an oil injection hole and a second oil inlet inner hole are coaxially arranged in the valve core, and the oil injection hole is communicated with the second oil inlet inner hole; a steel ball and a pressure regulating spring are assembled in the oil return cavity of the overflow valve body, and the pressure regulating spring is positioned between the steel ball and the upper end of the valve core; the overflow valve is characterized in that two-stage radial oil outlet is arranged on the valve core at intervals along the axis direction of the valve core, at least one first radial oil outlet hole is formed in the middle of the overflow valve body, two-stage oil return is formed between the first radial oil outlet hole in the overflow valve body and the two-stage radial oil outlet of the valve core, and the size of each stage of oil return changes from one-stage oil return hole to two-stage oil return holes along with the change of the lift range of the valve core.

2. The two-stage opening pressure controlled flow relief valve according to claim 1, wherein the two-stage radial oil outlet on the valve element is divided into a first-stage radial oil outlet and a second-stage radial oil outlet, and the first-stage radial oil outlet is located below the second-stage radial oil outlet.

3. The two-stage opening pressure flow control overflow valve according to claim 2, wherein each stage of radial oil outlet on the valve element has 2 to 3 second oil outlet holes, and the 2 to 3 second oil outlet holes are located on the same radial plane and are circumferentially distributed on the same radial plane.

4. The two-stage opening pressure control flow overflow valve according to claim 3, wherein the number of the first radial oil outlet holes is two, and the two first radial oil outlet holes are located on the same radial plane and are circumferentially distributed on the same radial plane.

5. The overflow valve with two-stage opening pressure control flow of claim 4, wherein a lubricating oil groove is formed in the outer circle of the valve core and is positioned below the second-stage radial oil outlet; and an oil inlet hole is formed in the position, corresponding to the lubricating oil groove, of the overflow valve body, and the oil inlet hole is communicated with the lubricating oil groove.

6. The overflow valve with two-stage opening pressure to control flow according to claim 5, wherein a retainer groove is provided on the valve core, and a retainer is clamped in the retainer groove and the retainer clamps the valve core.

7. The two-stage opening pressure controlled flow overflow valve according to claim 5, wherein a seal ring groove is provided on the outer circumference of the overflow valve body, the seal ring groove is located above the first radial oil outlet hole, and an overflow valve seal ring is assembled in the seal ring groove.

8. The two-stage opening pressure controlled flow overflow valve according to claim 7, wherein an external thread is provided on the outer circumference of the overflow valve body, the external thread is located below the first radial oil outlet and above the oil inlet, and a thread sealant is coated on the external thread.