Pneumatic pressure release valve capable of monitoring pressure in real time

Abstract

The utility model relates to a pneumatic pressure release valve capable of monitoring pressure in real time. The pneumatic pressure release valve comprises a valve body, a temperature sensor, a valve element, a piston, a first O-shaped ring, a second O-shaped ring, a bolt, a pressure adjusting spring, a pressure adjusting gasket, a gland, an outer tightening cap and an inner tightening cap. The valve body is provided with a hollow cavity penetrating through the two ends, and the gland is installed on the large end face of the valve body and pressed through a bolt. The valve body is provided with an air inlet connector, a sensor installation connector and a fuel oil return opening. The sensor is mounted on the sensor mounting interface on the valve body and communicated to the hollow cavity at the small end of the valve body to monitor the internal pressure of the hollow cavity in real time; the valve core is mounted on a preset conical surface in the hollow cavity in the valve body to separate the hollow cavity in the valve body and close the fuel oil return port at the same time; an air inlet interface on the valve body is communicated into a closed cavity formed by the piston and the valve body through a hole channel preset in the valve body; the inner tightening cap is connected with the small end of the valve body, and the outer tightening cap is sleeved outside the inner tightening cap; the valve is compact in structure and reliable in function, and high-oil-pressure relief is achieved through small air pressure.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of engine common rail system cut -out valve, concretely is a kind of pneumatic pressure relief valve of real -time monitoring pressure. BACKGROUND

[0002] With the continuous development of domestic high-pressure common rail fuel injection system, the related technology of common rail system is increasingly mature, but with the continuous improvement of technical index, such as system pressure, now domestic common rail system has developed to the working pressure 200MPa level. The increase of working pressure inevitably accompanies the increase of safety risk, and the related valve attached to the common rail system designed for safety consideration is particularly important, and the cut -out valve is one of them.

[0003] The cut -out valve plays an important role in the overpressure or shutdown pressure relief process of common rail system, and the reliability of its control and the stability of its implementation function need to be considered in design. In addition, the compactness of structure installation needs to be considered. Under the premise of ensuring reliability, as compact as possible structure is applied to realize more functions. INVENTION CONTENTS

[0004] The utility model aims at providing a kind of pneumatic pressure relief valve of real -time monitoring pressure, meet the safety needs and shutdown pressure relief needs of high-pressure common rail fuel system.

[0005] In order to achieve the above purpose, the scheme of the utility model is as follows:

[0006] The application provides a kind of pneumatic pressure relief valve of real -time monitoring pressure, comprising: valve body, pressure sensor, valve core, piston, pressure regulating spring and gland;

[0007] The valve body has a hollow cavity communicating with its upper and lower surfaces, and an air inlet, a sensor mounting interface, a fuel inlet and a fuel return port communicating with the hollow cavity;

[0008] The gland is assembled on the valve body;

[0009] The valve core, the piston and the pressure regulating spring are assembled in the hollow cavity and the inner cavity of the gland from bottom to top;

[0010] Among them, the hollow cavity is provided with a taper surface for forming a seal with the valve core, and the pressure sensor is installed in the sensor mounting interface and extends into the hollow cavity, and measures the pressure of high-pressure fuel flowing into the hollow cavity from the fuel inlet;

[0011] The valve core blocks the flow of high-pressure fuel from the fuel return port when forming a taper seal with the hollow cavity;

[0012] The piston is driven by the gas entering through the gas inlet interface to drive the valve core to unseal the conical surface with the hollow cavity.

[0013] Preferably, the piston comprises a first section and a second section connected together, and the outer diameter of the first section is larger than that of the second section.

[0014] An area-variable closed cavity is formed between the first section of the piston and the hollow cavity of the valve body.

[0015] The gas entering through the gas inlet interface enters the closed cavity to push the piston to drive the valve core to move, so that the valve core unseals the conical surface with the hollow cavity.

[0016] Preferably, a pressure regulating gasket is arranged between the pressure regulating spring and the gland.

[0017] Preferably, a hole is arranged on the gland to communicate the outer wall and the inner cavity thereof.

[0018] Preferably, an inner cap and an outer cap are arranged on one end of the fuel inlet of the valve body.

[0019] The inner cap is connected with the valve body through threads.

[0020] The outer cap is provided with external threads, the outer cap is sleeved on the inner cap, and the outer cap is pressed against the inner cap through the outer conical surface of the inner cap.

[0021] Preferably, a plurality of grooves are uniformly arranged on the outer conical surface of the inner cap to communicate the inner wall thereof.

[0022] Preferably, the gland is fixed on the valve body through bolts.

[0023] Preferably, a second O-ring is arranged between the first section of the piston and the hollow cavity, and a first O-ring is arranged between the second section of the piston and the hollow cavity.

[0024] The piston is driven by the gas entering through the gas inlet interface to drive the valve core to unseal the conical surface with the hollow cavity.

[0025] When the fuel pressure entering the hollow cavity detected by the pressure sensor exceeds the preset pressure, the piston is pushed upward by the gas entering the gas interface to drive the valve core to unseal the conical surface with the hollow cavity. 液 +F 气 >F 弹 When the force relationship of the piston changes to F

[0026] By setting a sensor mounting interface on the valve body and installing a pressure sensor, the pressure of high-pressure fuel inside the pneumatic pressure relief valve can be monitored in real time, improving the data monitoring capability and ensuring the safety of the system.

[0027] Through the form of the area difference of the upper and lower force receiving surfaces of the piston, a smaller gas pressure can be converted into a larger force through a larger area difference, so that the lifting of the piston is realized by using a smaller gas pressure, avoiding the additional cost of the pressurizing equipment caused by pressurizing the gas; in addition, the pneumatic pressure relief valve is controlled to open by using low-pressure gas, which is high in reliability and economic and environmental protection.

[0028] The pneumatic pressure relief valve is sealed by a spherical surface and a pressure source component, and is connected to the pressure source component in a combined manner of an inner cap and an outer cap, so that the pneumatic pressure relief valve can be rotated at any angle along an axis during installation, facilitating the connection of the fuel return port of the pneumatic pressure relief valve with an oil pipe outside, avoiding the uncertainty of the direction of the fuel return port when the pneumatic pressure relief valve is directly screwed into the interface of the pressure source component, and improving the convenience of use and installation. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 It is a whole structure schematic view of the pneumatic pressure relief valve in the embodiments of the present application.

[0030] Figure 2 It is a P direction schematic view of the pneumatic pressure relief valve in the embodiments of the present application. Figure 1

[0031] Figure 3 It is a structure schematic view of the valve body in the embodiments of the present application.

[0032] Figure 4 It is a structure schematic view of the piston in the embodiments of the present application.

[0033] Figure 5 It is a structure schematic view of the outer cap in the embodiments of the present application.

[0034] Figure 6 It is a structure schematic view of the inner cap in the embodiments of the present application. DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application.

[0036] As shown in Figure 1 and Figure 2 , the embodiments of the present application provide a pneumatic pressure relief valve capable of monitoring pressure in real time, which comprises a valve body 1, a pressure sensor 2, a valve core 3, a piston 4, a first O-shaped ring 5, a second O-shaped ring 6, a bolt 7, a pressure regulating spring 8, a pressure regulating gasket 9, a gland 10, an outer cap 11 and an inner cap 12. ​

[0037] As Figures 1 to 3 , the valve body 1 has a hollow cavity 106, which penetrates the upper and lower end faces of the valve body 1, and the valve core 3 and the piston 4 are installed in the hollow cavity 106 of the valve body 1 from bottom to top.

[0038] The hollow cavity 106 is a multi-stage cylindrical hole, and a tapered surface is arranged inside the hollow cavity 106.

[0039] In Figures 1 to 3 , the gland 10 is placed on the upper large end face of the valve body 1, and the gland 10 is assembled on the valve body 1 by a plurality of evenly distributed bolts 7; the pressure adjusting spring 8 is arranged between the piston 4 and the gland 10, and the pressure adjusting gasket 9 is arranged between the gland 10 and the pressure adjusting spring 8.

[0040] Referring to Figure 1 and Figure 3 , the valve body 1 is additionally provided with an air inlet 101, a sensor mounting interface 107, a fuel inlet 103 and a fuel return port 102, wherein the sensor mounting interface 107, the fuel inlet 103 and the fuel return port 102 are all in communication with the hollow cavity 106, and the fuel return port 102 is arranged above the tapered surface of the hollow cavity 106.

[0041] The pressure sensor 2 is installed in the sensor mounting interface 107 on the valve body 1 and is in communication with the hollow cavity 106 at the small end of the valve body 1, so as to monitor the pressure inside the hollow cavity 106 in real time.

[0042] Referring to Figure 1 , the valve core 3 is installed on the tapered surface in the hollow cavity 106 in the valve body 1. When the valve core 3 forms a seal with the tapered surface of the hollow cavity 106, the valve core 3 blocks the hollow cavity 106 of the valve body 1, thereby blocking the high-pressure fuel, and at this time the pressure of the high-pressure fuel acts on the sealing surface of the valve core 3, forming an upward hydraulic force F 液 and is transmitted to the piston 4; at the same time, when the valve core 3 forms a seal with the tapered surface of the hollow cavity 106, the fuel return port 102 is closed.

[0043] Referring to Figure 1 , Figure 5 and Figure 6 , the air inlet 101 on the valve body 1 is in communication with the closed cavity 105 formed by the piston 4 and the valve body 1 through the pre-set hole 104 in the valve body 1; the inner cap 12 is connected with the small end of the valve body 1, and the outer cap 11 is tightly sleeved outside the inner cap 12.

[0044] Referring to Figure 1 , the pressure sensor 2 is installed in the pre-set sensor mounting interface 107 on the valve body 1 and is in communication with the small end of the hollow cavity 106 on the valve body 1, so as to monitor the fuel pressure inside the hollow cavity 106 in real time.

[0045] Referring toFigure 1 and Figure 4 The piston 4 is a two-stage outer circle structure with a large difference in outer circle area. The piston 4 includes a first section and a second section. The outer diameter of the first section is larger than that of the second section. A second O-ring 6 is installed between the first section and the hollow cavity 106. A first O-ring 5 is installed between the second section and the hollow cavity 106. The piston 4 can move up and down in the hollow cavity 106 of the valve body 1. The pressure adjusting spring 8 provides a downward pre-tightening force F to the piston 4 弹 . The spool 3 is in contact with the tapered surface of the hollow cavity 106 under the downward action of the piston 4. The lower surface of the first section of the piston 4 forms a sealed cavity 105 with the valve body 1. The gas with a certain pressure enters the sealed cavity 105 from the gas inlet 101 and acts on the lower surface of the first section of the piston 4, generating an upward thrust F 气 .

[0046] When the force relationship of the piston 4 is F 液 +F 气 >F 弹 , the piston 4 is lifted up by the spool 3. The high-pressure fuel from the fuel inlet 103 flows out from the fuel return port 102 of the valve body 1, thereby achieving the purpose of pressure relief.

[0047] Referring to Figure 1 , the grommet 10 is provided with a boss inside for installing and positioning the pressure adjusting spring 8. The outer wall is provided with a hole 110 which is connected to the inner cavity of the grommet 10, so that the inner cavity of the grommet 10 remains consistent with the external air pressure after assembly.

[0048] Referring to Figure 1 and Figure 3 , the small end of the valve body 1 is in a ball head structure. The inner cap 12 is connected to the small end of the valve body 1 through a threaded connection and is positioned by a tapered surface. The outer cap 11 is provided with external threads and is sleeved outside the inner cap 12. The inner cap 12 is pressed tightly by the tapered surface pre-set on the inner cap 12. Referring to Figure 6 , the outer tapered surface of the inner cap 12 is uniformly provided with a plurality of grooves 121 which are connected to the inner wall. After being pressed by the outer cap 11, the grooves 121 will be slightly deformed inward, further tightly holding the small end of the valve body 1. The outer cap 11 is connected to the installation interface of the pressure relief valve through a threaded connection. At this time, the pressure relief valve is sealed with the pressure source component through the ball head of the small end of the valve body 1. The pressure relief valve can be rotated to any angle along the axial direction, which is convenient for connecting the fuel return port 102 of the pressure relief valve with the external oil pipe.

[0049] The specific implementation process is as follows: by setting the hollow cavity 106 inside the valve body 1, setting the conical surface in the hollow cavity 106, installing the valve core 3 on the conical surface, cutting off the high-pressure fuel, installing the piston 4, the pressure regulating spring 8 and the pressure regulating gasket 6 on the valve core 3 from bottom to top, pressing by the gland 10, providing the valve core 3 with pre-tightening force by the pressure regulating spring 8, setting the gas inlet interface 101 on the valve body 1 and setting the internal hole 104, combining the two-stage outer circle structure design of the piston 4 with large area difference, when a certain pressure gas is introduced from the gas inlet interface 101, certain conditions are reached, such as F 液 +F 气 >F 弹 When the piston 4 moves upward, the valve core 3 is opened, the high-pressure fuel flows out from the reserved fuel return port 102 on the valve body 1, and the purpose of pressure relief is achieved.

[0050] In addition, the sensor mounting interface 107 is arranged on the valve body 1, the pressure sensor 2 can be installed and the internal pressure can be detected in real time; through the design of the above structure scheme, the reliable, economical and environmentally friendly pneumatic pressure relief with compact structure can be realized.

[0051] It should be noted that in this paper, the relationship terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the term "include", "contain" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements not only includes those elements, but also includes other elements not explicitly listed or fixed for such process, method, article or equipment. The monitoring function of the cut-off valve is not limited to monitoring pressure, and by adjusting the type of sensor installed on the valve body, other parameters such as temperature can be monitored.

Claims

1. A pneumatically actuated pressure relief valve that can be monitored in real time, characterized in that The valve body (1), the pressure sensor (2), the valve core (3), the piston (4), the pressure regulating spring (8) and the gland (10) are included. The valve body has a hollow cavity (106) communicating with its upper and lower surfaces, and an air inlet interface (101), a sensor mounting interface (107), a fuel inlet (103) and a fuel return port (102) communicating with the hollow cavity (106). The gland (10) is assembled on the valve body (1). The valve core (3), the piston (4) and the pressure regulating spring (8) are assembled from bottom to top in the hollow cavity (106) and the inner cavity of the gland (10). The hollow cavity (106) is provided with a tapered surface for sealing with the valve core (3), the pressure sensor (2) is installed in the sensor mounting interface (107) and extends into the hollow cavity (106), and the high-pressure fuel flowing into the hollow cavity (106) from the fuel inlet (103) is measured. When the valve core (3) forms a tapered surface seal with the hollow cavity (106), it blocks the flow of high-pressure fuel from the fuel return port (102). The piston (4) is driven by the gas entering through the air inlet interface (101) to remove the tapered surface seal between the valve core (3) and the hollow cavity (106). The piston (4) includes a first section and a second section connected to each other, and the outer diameter of the first section is larger than that of the second section.

2. The pressure relief valve according to claim 1, wherein The first section of the piston (4) and the hollow cavity (106) of the valve body form an area-variable closed cavity (105). The gas entering from the air inlet interface (101) enters the closed cavity (105), pushing the piston (4) to drive the valve core (3) to move, so that the valve core (3) and the hollow cavity (106) are removed from the tapered surface seal. The pressure regulating gasket (9) is arranged between the pressure regulating spring (8) and the gland (10).

3. The pressure relief valve of claim 1, wherein, The gland (10) is provided with a hole (110) communicating with its outer wall and its inner cavity.

4. The pressure relief valve of claim 1, wherein, The valve body (1) is provided with an inner cap (12) and an outer cap (11) on one end of the fuel inlet (103); 5. The pressure relief valve of claim 1, wherein, The inner cap (12) is connected with the valve body (1) by threads; The outer cap (11) is provided with external threads, the outer cap (11) is sleeved on the inner cap (12), and the outer cap (11) is pressed against the inner cap (12) by the outer tapered surface of the inner cap (12). The outer tapered surface of the inner cap (12) is uniformly provided with a plurality of grooves (121) communicating with its inner wall.

6. The pressure relief valve of claim 5, wherein, The gland (10) is fixed on the valve body (1) by bolts (7).

7. The pressure relief valve of claim 1, wherein, The second O-ring (6) is arranged between the first section of the piston (4) and the hollow cavity (106), and the first O-ring (5) is arranged between the second section of the piston (4) and the hollow cavity (106).

8. The pressure relief valve of claim 2, wherein, ​

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