High pressure multi-stage pressure regulating overflow safety valve

Abstract

The application discloses a high-pressure multi-stage pressure regulating overflow safety valve, which comprises a position sensor, a position indicating rod, a low-pressure flange, a sealing ring, a low-pressure piston, a high-pressure piston, a cylinder sleeve, a multi-stage discharge flange and a valve positioner. High-pressure fuel is discharged from a sealing oil discharge port, when the pressure is lower than the set pressure, the high-pressure piston is in the most right side and does not move, when the pressure is increased, the pressure in the low-pressure cylinder is adjusted, the high-pressure piston moves to the left, and the pressure is adjusted by overflow discharge through the 1-4 stage discharge ports, when the pressure is too high, the high-pressure piston is in the most left side, the safety discharge port is opened, and the pressure is completely discharged to realize the safety protection function. The application solves the pressure adjustment of high-pressure fuel, realizes safety control, has simple structure, low installation requirement, easy maintenance and low cost, can realize intelligent pressure control, reduces high-pressure common rail opening, and is simpler in arrangement compared with the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of high pressure multistage pressure regulating overflow safety valve. BACKGROUND

[0002] Engine high pressure common rail fuel system has the characteristics of high fuel pressure, high control requirements.Common safety valve, overflow valve, pressure regulating valve and other components are applied to engine high pressure common rail fuel system, and high pressure interface is needed, and most of them have the problem of high risk of leakage. SUMMARY

[0003] The technical problem to be solved by the present application is that common safety valve, overflow valve, pressure regulating valve and other components are applied to engine high pressure common rail fuel system, and high pressure interface is needed, and most of them have the problem of high risk of leakage.

[0004] To solve the above technical problems, the technical scheme of the present application discloses a kind of high pressure multistage pressure regulating overflow safety valve, which is characterized by including cylinder sleeve, low pressure flange and multistage discharge flange are respectively arranged at the left and right ends of the cylinder sleeve, low pressure piston is arranged in the cylinder sleeve and can move left and right in horizontal direction, low pressure piston divides the internal space of the cylinder sleeve into two relatively independent subspaces on the left and right;

[0005] A position indicating rod is arranged in the left subspace in the cylinder sleeve, the right end of the position indicating rod is connected and fixed with the low pressure piston, and the left end is exposed outside the cylinder sleeve after passing through the low pressure flange; a position sensor is arranged near the left end of the position indicating rod, the position sensor is connected with the valve positioner, and the valve positioner is also connected with the left subspace in the cylinder sleeve for communication.

[0006] A high-pressure piston is arranged in the right sub-space in the cylinder sleeve, the left end of the high-pressure piston is fixedly connected with the low-pressure piston, and the right end is located in the multi-stage discharge flange; the multi-stage discharge flange is sequentially provided with a safety discharge groove, a third and fourth stage discharge groove and a first and second stage discharge groove from left to right; the safety discharge groove, the third and fourth stage discharge groove and the first and second stage discharge groove are in communication with a safety discharge port, a third and fourth stage discharge port and a first and second stage discharge port on the multi-stage discharge flange respectively; the multi-stage discharge flange is further provided with a sealing oil discharge port which is always in communication with the right sub-space in the cylinder sleeve; high-pressure fuel enters the cylinder sleeve from the sealing oil discharge port; when the pressure in the cylinder sleeve is lower than the set pressure, the high-pressure piston is at the rightmost position, and the safety discharge groove, the third and fourth stage discharge groove and the first and second stage discharge groove are completely closed; when the pressure in the cylinder sleeve increases, the high-pressure piston moves to the left, opens the first and second stage discharge groove, and makes the first and second stage discharge groove in communication with the right sub-space in the cylinder sleeve, so that the pressure is adjusted by overflow discharge through the first and second stage discharge port; when the pressure in the cylinder sleeve further increases, the high-pressure piston continues to move to the left, and then opens the third and fourth stage discharge groove, so that the third and fourth stage discharge groove is in communication with the right sub-space in the cylinder sleeve, and the pressure is adjusted by overflow discharge through the first and second stage discharge groove and the third and fourth stage discharge port; when the pressure is too high, the high-pressure piston moves to the leftmost position, and the safety discharge groove is opened, so that the safety discharge groove is in communication with the right sub-space in the cylinder sleeve, and the pressure is adjusted by overflow discharge through the first and second stage discharge groove, the third and fourth stage discharge port and the safety discharge port, and the pressure is completely discharged.

[0007] Preferably, the outer circumferential surface of the low-pressure piston is sealed with the inner wall of the cylinder sleeve by a sealing ring.

[0008] Preferably, the contact part of the position indicating rod with the low-pressure flange is sealed by a sealing ring.

[0009] Preferably, the position sensor is fixed on the low-pressure flange.

[0010] Preferably, the third and fourth stage discharge groove comprises a third stage discharge groove and a fourth stage discharge groove which are independent of each other.

[0011] Preferably, the first and second stage discharge groove comprises a first stage discharge groove and a second stage discharge groove which are independent of each other.

[0012] The present application solves the pressure regulation of high-pressure fuel, safety control, simple structure, low installation requirement, easy maintenance, low cost, intelligent pressure control, reduction of high-pressure common rail opening, and simpler arrangement compared with the prior art. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 Fig. 1 is a structural schematic diagram of a high-pressure multi-stage pressure regulating overflow safety valve according to the present application. DETAILED DESCRIPTION

[0014] Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiments are only used to illustrate the present invention and are not used in limiting the scope of the present invention.In addition, should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms fall equally within the scope limited by the appended claims of the application.

[0015] like Figure 1 As shown, the present invention discloses a high-pressure, multi-stage pressure-regulating, overflow safety valve comprising a cylinder liner 1, with a low-pressure flange 2 and a multi-stage relief flange 3 mounted on the left and right ends, respectively. A low-pressure piston 4 is disposed within the cylinder liner 1, movable horizontally left and right. The outer circumference of the low-pressure piston 4 seals against the inner wall of the cylinder liner 1 via a sealing ring 5, thereby dividing the interior of the cylinder liner 1 into two relatively independent subspaces on the left and right.

[0016] A position indicator rod 6 is installed in the left subspace within the cylinder liner 1. The right end of the rod 6 is fixedly connected to the low-pressure piston 4, while the left end passes through the low-pressure flange 2 and is exposed outside the cylinder liner 1. The contact between the rod 6 and the low-pressure flange 2 is sealed by a sealing ring 7. A position sensor 8 is installed near the left end of the rod 6. This sensor 8 is connected to a valve positioner 9 with a display screen. The valve positioner 9 is also connected to the left subspace within the cylinder liner 1. In this embodiment of the present invention, the position sensor 8 is fixed to the low-pressure flange 2.

[0017] A high-pressure piston 9 is arranged in the right sub-space in the cylinder liner 1. The left end of the high-pressure piston 9 is fixedly connected with the low-pressure piston 4, and the right end is located in the multi-stage discharge flange 3. In the multi-stage discharge flange 3, a safety discharge groove 10, a third and fourth stage discharge groove 11 and a first and second stage discharge groove 12 are arranged in sequence from left to right. The safety discharge groove 10, the third and fourth stage discharge groove 11 and the first and second stage discharge groove 12 are respectively connected with a safety discharge port 13, a third and fourth stage discharge port 14 and a first and second stage discharge port 15 on the multi-stage discharge flange 3. The multi-stage discharge flange 3 is further provided with a sealing oil discharge port 16 which is always connected with the right sub-space in the cylinder liner 1. High-pressure fuel enters the cylinder liner 1 from the sealing oil discharge port 16. When the pressure in the cylinder liner 1 is lower than the set pressure, the high-pressure piston 9 is at the rightmost position, and the piston is not in action, completely closing the safety discharge groove 10, the third and fourth stage discharge groove 11 and the first and second stage discharge groove 12. When the pressure in the cylinder liner 1 is increased, in order to adjust the pressure in the low-pressure cylinder, the high-pressure piston 9 moves to the left, opening the first and second stage discharge groove 12, so that the first and second stage discharge groove 12 is connected with the right sub-space in the cylinder liner 1, thereby adjusting the pressure through overflow discharge through the first and second stage discharge port 15. When the pressure in the cylinder liner 1 is further increased, the high-pressure piston 9 continues to move to the left, and then opens the third and fourth stage discharge groove 11, so that the third and fourth stage discharge groove 11 is connected with the right sub-space in the cylinder liner 1, thereby adjusting the pressure through overflow discharge through the first and second stage discharge groove 12 and the third and fourth stage discharge port 14. When the pressure is too high, the high-pressure piston 9 moves to the leftmost position, opening the safety discharge groove 10, so that the safety discharge groove 10 is connected with the right sub-space in the cylinder liner 1, thereby adjusting the pressure through overflow discharge through the first and second stage discharge groove 12, the third and fourth stage discharge port 14 and the safety discharge port 13, and the pressure is completely discharged, thereby playing a safety protection function.

Claims

1. A high-pressure multi-stage pressure-regulating overflow safety valve, characterized in that: The cylinder liner comprises a cylinder liner, the left and right ends of which are respectively provided with a low-pressure flange and a multi-stage relief flange. A low-pressure piston is provided in the cylinder liner and can move left and right in the horizontal direction. The low-pressure piston divides the internal space of the cylinder liner into two relatively independent sub-spaces on the left and right. A position indicator rod is provided in the left subspace within the cylinder liner. The right end of the position indicator rod is fixedly connected to the low-pressure piston, and the left end passes through the low-pressure flange and is exposed outside the cylinder liner. A position sensor is provided near the left end of the position indicator rod. The position sensor is connected to the valve positioner, which is also connected to the left subspace within the cylinder liner. A high-pressure piston is provided in the right subspace in the cylinder liner, the left end of the high-pressure piston is connected and fixed to the low-pressure piston, and the right end is located in the multi-stage relief flange; in the multi-stage relief flange, a safety relief groove, three- and four-stage relief grooves, and one- and two-stage relief grooves are provided in sequence from left to right; the safety relief groove, three- and four-stage relief grooves, and one- and two-stage relief grooves are respectively connected with the safety relief port, three- and four-stage relief port, and one- and two-stage relief port located on the multi-stage relief flange; the multi-stage relief flange is also provided with a sealing oil relief port which is always connected with the right subspace in the cylinder liner; high-pressure fuel enters the cylinder liner from the sealing oil relief port: when the pressure in the cylinder liner is lower than the set pressure, the high-pressure piston is on the far right, completely sealing the safety relief groove, three- and four-stage relief grooves, and one- and two-stage relief grooves; when After the pressure in the cylinder liner increases, the high-pressure piston moves to the left, opening the first and second level relief grooves, so that the first and second level relief grooves are connected with the right subspace in the cylinder liner, thereby overflowing and discharging the regulated pressure through the first and second level relief ports; when the pressure in the cylinder liner further increases, the high-pressure piston continues to move to the left, and then opens the third and fourth level relief grooves, so that the third and fourth level relief grooves are connected with the right subspace in the cylinder liner, thereby overflowing and discharging the regulated pressure through the first and second level relief grooves and the third and fourth level relief ports; when the pressure is too high, the high-pressure piston moves to the far left, opens the safety relief groove, and the safety relief groove is connected with the right subspace in the cylinder liner, thereby overflowing and discharging the regulated pressure through the first and second level relief grooves, the third and fourth level relief ports and the safety relief ports, and the pressure is completely released.

2. A high-pressure multi-stage pressure-regulating overflow safety valve according to claim 1, characterized in that: The outer circumferential surface of the low-pressure piston is sealed with the inner wall of the cylinder sleeve through a sealing ring.

3. A high-pressure multi-stage pressure-regulating overflow safety valve according to claim 1, characterized in that: The contact portion between the position indicating rod and the low-pressure flange is sealed by a sealing ring.

4. A high-pressure multi-stage pressure-regulating overflow safety valve according to claim 1, characterized in that: The position sensor is fixed on the low-pressure flange.

5. A high-pressure multi-stage pressure-regulating overflow safety valve according to claim 1, characterized in that: The three and four stage discharge troughs include independent three stage discharge troughs and four stage discharge troughs.

6. A high-pressure multi-stage pressure-regulating overflow safety valve according to claim 1, characterized in that: The first and second level discharge troughs include a first level discharge trough and a second level discharge trough which are independent of each other.

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