Pressure valve

Abstract

The utility model discloses a pressure valve which comprises a valve casing and a valve core, the valve casing is provided with a cavity with an upward opening, the middle lower portion of the valve core is inserted into the cavity, a valve cavity is arranged inside the valve core, an oil return channel is arranged at the upper end of the valve cavity, a filter screen covering the top of the valve casing is sleeved outside the upper end of the valve core, a valve cover is fixed at the lower end of the valve core, and the valve cover is provided with a through hole. A valve head used for blocking an opening in the upper end of the through hole is placed in the valve cavity, a first spring which extends up and down and presses the upper end of the valve head is installed in the valve cavity, a plurality of protruding blocks are evenly distributed on the outer wall of the middle of the valve element along the circumference, the outer walls of the protruding blocks make contact with the inner wall of the cavity of the valve shell, and an oil inlet channel is formed between every two adjacent protruding blocks. A telescopic steel ball is installed on the outer side of each protruding block, and an annular clamping groove for the steel balls to be clamped in is formed in the inner wall of the upper end of the cavity. A valve clack is slidably mounted on the inner wall of the upper end of the bonnet, a valve rod is fixed in the middle of the valve clack, and the upper end of the valve rod is fixedly connected with the valve head. The designed pressure valve is long in service life.

Description

TECHNICAL FIELD

[0001] The utility model relates to a pressure valve, specifically a pressure valve applied to a fuel pump. BACKGROUND

[0002] The fuel pump pressure valve is a key component in the automobile fuel supply system, mainly used for adjusting the pressure of the fuel system to ensure that the fuel pressure is stable and meets the engine operation requirements. The pressure valve applied to the fuel pump in the prior art generally includes a filter screen, a valve core, a valve head, a valve cover, a valve rod, a first spring, a valve shell and the like. When working, the oil is filtered through the filter screen and then enters the inside of the valve shell along the oil inlet channel of the valve core. When the fuel pump continues to supply oil, the oil pressure rises above the set value. Under the action of the oil pressure, the valve head is pushed upwards, the internal channel of the valve cover is opened, the oil flows out from the oil return channel in the center of the valve core along the inside of the valve core, the excess oil flows back to the oil tank, the oil pressure in the valve shell decreases, and the valve head moves downwards under the reset of the first spring and blocks the valve cover. However, the fuel pump pressure valve in the prior art has the following problems in use: when the valve core is installed in the valve shell, several protrusions are protruded on the outer wall of the middle part of the valve core, the valve core is inserted into the valve shell, and the valve core is installed by the friction force between the outer wall of the protrusion and the inner wall of the valve shell. However, there is a problem: the installation of the valve core and the valve shell is actually not stable. Long-term overlarge oil pressure, combined with the aging problem of the valve core, can easily cause the valve core to loosen, resulting in that the pressure valve cannot be used normally and the service life needs to be improved. In addition, the valve head is only supported by the first spring, lacks other components for supporting the valve head, and is prone to tilting during the upward and downward movement of the valve head. SUMMARY

[0003] In view of the defects of the prior art, the purpose of the utility model is to provide a pressure valve.

[0004] The technical solution of the utility model is as follows: a pressure valve, comprising a valve shell and a valve core, the valve shell has a cavity with an opening facing upwards, the middle and lower parts of the valve core are inserted into the cavity, the inside of the valve core has a valve cavity penetrating upwards and downwards, the upper end of the valve cavity has an oil return channel, the valve core has a filter screen covering the top of the valve shell, the lower end of the valve core is fixed with a valve cover, the valve cover has a through hole penetrating upwards and downwards, the lower end of the through hole is communicated with the cavity, the valve cavity is provided with a valve head abutting against the top of the valve cover and used for blocking the opening of the upper end of the through hole, the valve cavity is provided with a first spring extending upwards and downwards and pressing against the upper end of the valve head, the outer wall of the middle part of the valve core is uniformly distributed with a plurality of protrusions along the circumference, the outer wall of the protrusion is in contact with the inner wall of the cavity of the valve shell, the oil inlet channel is formed between the adjacent protrusions, each protrusion is provided with a telescopic steel ball on the outer side, and the upper end of the inner wall of the cavity is provided with an annular clamping groove for clamping the steel ball; the upper end of the inner wall of the valve cover is slidably provided with a valve flap, the middle of the valve flap is fixed with a valve rod, and the upper end of the valve rod is fixedly connected with the valve head.

[0005] Furthermore, the outer side of the valve disc has multiple through holes, which are connected to the valve cavity and through holes.

[0006] Furthermore, when the oil pressure inside the valve housing cavity is too high, the oil pushes the valve disc, valve stem, and valve head upwards, causing the valve head to separate from the valve cover, and the oil enters the valve cavity of the valve core through the through hole and the through hole.

[0007] Furthermore, the outer wall of the valve disc comes into contact with the inner wall of the valve cover.

[0008] Furthermore, each protrusion has an outward-facing groove on its outer side, and a first spring extending inward and outward is fixed in each groove. One end of the first spring is connected to a steel ball, and the outer end of the steel ball extends out of the groove and is engaged in an annular groove.

[0009] The pressure valve provided by this utility model has the following advantages: By installing a retractable steel ball on the outer side of the protrusion on the outer wall of the valve core, and utilizing the annular groove on the inner wall of the upper end of the cavity, the steel ball is inserted into the annular groove and works together with the protrusion. Compared with the installation method where only the protrusion contacts the inner wall of the valve body, this greatly enhances the stability of the valve core and valve body installation, effectively prevents loosening caused by long-term excessive oil pressure and valve core aging, and extends the service life of the pressure valve. A valve disc is slidably installed on the inner wall of the upper end of the valve cover, and a valve stem is fixed in the middle of the valve disc. The upper end of the valve stem is fixedly connected to the valve head. The valve disc and valve stem provide additional support for the valve head, making it less likely for the valve head to tilt during up and down movement, thus ensuring the normal operation of the pressure valve. Attached Figure Description

[0010] Figure 1 This is a cross-sectional view of the present invention;

[0011] Figure 2 This is a schematic diagram of the installation of the valve shell and valve core of this utility model;

[0012] Figure 3 This is a top view of the valve core of this utility model;

[0013] Figure 4 This is a schematic diagram of the valve disc structure of this utility model.

[0014] In the figure: 1—valve housing, 11—cavity, 111—annular groove, 2—valve core, 21—valve chamber, 211—oil return channel, 22—protrusion, 221—groove, 23—oil inlet channel, 3—filter screen, 4—valve cover, 41—through hole, 5—valve head, 6—first spring, 7—steel ball, 8—valve disc, 81—through hole, 9—valve stem, 10—outer shell, 20—second spring. Detailed Implementation

[0015] To provide a more intuitive and complete understanding of the technical solution of this utility model, the following non-limiting features are described in conjunction with the accompanying drawings:

[0016] like Figure 1 — Figure 4 As shown, a pressure valve includes a valve housing 1 and a valve core 2. The valve housing 1 has an upward-opening cavity 11. The lower middle part of the valve core 2 is inserted into the cavity 11. The valve core 2 has a vertically penetrating valve chamber 21. The upper end of the valve chamber 21 has a return oil channel 211. A filter screen 3 covering the top of the valve housing 1 is sleeved on the upper end of the valve core 2. A valve cover 4 is fixed to the lower end of the valve core 2. The valve cover 4 has a vertically penetrating through hole 41. The lower end of the through hole 41 communicates with the cavity 11. A valve head 5 is placed inside the valve chamber 21, resting against the top of the valve cover 4 and used to block the upper opening of the through hole 41. A first spring 6, extending vertically and pressing against the upper end of the valve head 5, is installed inside cavity 21. Multiple protrusions 22 are evenly distributed along the circumference of the outer wall of the middle portion of the valve core 2. The outer walls of the protrusions 22 contact the inner wall of the cavity 11 of the valve housing 1. An oil inlet channel 23 is formed between adjacent protrusions 22. A retractable steel ball 7 is installed on the outer side of each protrusion 22. An annular groove 111 for the steel ball 7 to be inserted is located on the upper inner wall of the cavity 11. A valve disc 8 is slidably installed on the upper inner wall of the valve cover 4. A valve stem 9 is fixed in the middle of the valve disc 8, and the upper end of the valve stem 9 is fixedly connected to the valve head 5. An outer shell 10 is installed outside the valve housing 1.

[0017] like Figure 4 As shown, the valve disc 8 has multiple through holes 81 on its outer side, and the through holes 81 are connected to the valve cavity 21 and the through hole 41.

[0018] When the pressure valve is working, the oil is filtered through the filter screen 3 and enters the cavity 11 of the valve body 1 through the oil inlet channel 23. When the oil pressure inside the cavity 11 of the valve body 1 is too high, the oil pushes the valve disc 8, valve stem 9, and valve head 5 upward, the valve head 5 separates from the valve cover 4, the first spring 6 is compressed, and the oil enters the valve cavity 21 of the valve core 2 through the through hole 41 and the through hole 81, and finally flows out from the return oil channel 211. When the oil pressure returns to normal, the valve head 5 is reset by the elastic force of the first spring 6, so that the lower end of the valve head 5 blocks the upper opening of the through hole 41 of the valve cover 4.

[0019] The outer wall of valve disc 8 contacts the inner wall of valve cover 4, and valve disc 8 can slide up and down stably, so valve head 5 can move up and down stably, and valve head 5 is not easy to tilt.

[0020] like Figure 1 , Figure 2 As shown, each protrusion 22 has an outward-facing groove 221 on its outer side. A second spring 20 extending inward and outward is fixed in each groove 221. One end of the second spring 20 is connected to a steel ball 7. The outer end of the steel ball 7 extends out of the groove 221 and is then inserted into the annular groove 111.

[0021] The pressure valve provided by this utility model has a retractable steel ball 7 installed on the outer side of the protrusion 22 on the outer wall of the middle part of the valve core 2. The steel ball 7 is inserted into the annular groove 111 on the inner wall of the upper end of the cavity 11, and works together with the protrusion 22. Compared with the installation method where only the protrusion 22 contacts the inner wall of the valve body 1, this greatly enhances the stability of the installation between the valve core 2 and the valve body 1, effectively prevents the problem of loosening caused by long-term excessive oil pressure and aging of the valve core 2, and extends the service life of the pressure valve. A valve disc 8 is slidably installed on the inner wall of the upper end of the valve cover 4. A valve stem 9 is fixed in the middle of the valve disc 8. The upper end of the valve stem 9 is fixedly connected to the valve head 5. The valve disc 8 and the valve stem 9 provide additional support for the valve head 5, making it less likely for the valve head 5 to tilt during up and down movement, thus ensuring the normal operation of the pressure valve.

[0022] Of course, the above are only preferred embodiments of the present utility model, and do not limit the patent scope of the present utility model. Any simple modifications and equivalent structural changes made based on the contents of the present utility model specification and drawings should also be included within the patent protection scope of the present utility model.

Claims

1. A pressure valve, comprising a valve housing and a valve core, the valve housing having an upward-opening cavity, the lower middle part of the valve core inserted into the cavity, the valve core having a vertically penetrating valve chamber, the upper end of the valve chamber having an oil return channel, a filter screen covering the top of the valve housing being sleeved on the upper end of the valve core, a valve cover being fixed to the lower end of the valve core, the valve cover having a vertically penetrating through hole, the lower end of the through hole communicating with the cavity, a valve head placed inside the valve chamber resting against the top of the valve cover and used to block the upper opening of the through hole, and a first spring extending vertically and pressing against the upper end of the valve head being installed inside the valve chamber, characterized in that: Multiple protrusions are evenly distributed around the circumference of the outer wall of the valve core. The outer wall of the protrusions contacts the inner wall of the valve housing cavity. An oil inlet channel is formed between adjacent protrusions. A retractable steel ball is installed on the outer side of each protrusion. An annular groove for the steel ball to be inserted is provided on the inner wall of the upper end of the cavity. A valve disc is slidably installed on the inner wall of the upper end of the valve cover. A valve stem is fixed in the middle of the valve disc. The upper end of the valve stem is fixedly connected to the valve head.

2. A pressure valve according to claim 1, characterized in that: The valve disc has multiple through holes on its outer side, which are connected to the valve cavity and through holes.

3. A pressure valve according to claim 2, characterized in that: When the oil pressure inside the valve housing cavity is too high, the oil pushes the valve disc, valve stem, and valve head upwards, causing the valve head to separate from the valve cover. The oil then enters the valve cavity of the valve core through the through hole and the through hole.

4. A pressure valve according to claim 1, characterized in that: The outer wall of the valve disc contacts the inner wall of the valve cover.

5. A pressure valve according to claim 1, characterized in that: Each protrusion has an outward-facing groove on its outer side. A first spring extending inward and outward is fixed in each groove. One end of the first spring is connected to a steel ball. The outer end of the steel ball extends out of the groove and is engaged in an annular groove.

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