High-flow low-pressure mechanical pressure reducing valve

Abstract

The large-flow low-pressure mechanical pressure reducing valve comprises a valve body shell, an electromagnetic fixed valve element, a movable valve element and an input body, the input body is provided with three openings, the opening in the right side of the input body is an input opening, the opening in the lower end of the input body is an output opening, the opening in the upper end of the input body is a control opening, and the control opening is communicated with the valve body shell. The electromagnetic fixed valve element and the movable valve element are both arranged in the valve body shell, when the electromagnetic fixed valve element is in a power-off state, the lower end of the movable valve element is inserted into the output port to close the output port, and when the electromagnetic fixed valve element operates, the movable valve element moves upwards under the action of electromagnetic force so that the output port can be opened. The movable valve element is driven by the electromagnetic fixed valve element to move so as to control opening and closing of the output port, the operation stroke of the movable valve element is guaranteed, and the opening area of the output port meets the requirement. The large-flow low-pressure mechanical pressure reducing valve provided by the utility model has the advantages that the air outlet pressure and flow are improved, so that the use effect of a naturally aspirated large-displacement engine is met.

Description

Technical Field

[0001] This utility model relates to the field of automobile manufacturing technology, and in particular to a large-flow, low-pressure mechanical pressure reducing valve. Background Technology

[0002] The existing pressure reducing valve assembly is manufactured with an outlet pressure set to positive 0.22 MPa ± 0.01 MPa. During bench testing, it was found that the pressure difference between the CNG natural gas outlet pressure and the engine intake manifold air pressure at the existing pressure reducing valve assembly was 150 kPa at the engine's maximum speed of 4000 RPM. Based on the performance requirements at the engine's maximum speed, this pressure difference needs to be greater than 180 kPa.

[0003] The pressure-flow curves of the existing pressure-reducing valve assembly show that to meet the 22 kg / h flow rate requirement, the outlet pressure must be 150 kPa, which is insufficient to reach 180 kPa; conversely, to meet the 180 kPa outlet pressure requirement, the flow rate must be 20 kg / h, which is insufficient to reach 22 kg / h. Therefore, the existing pressure-reducing valve assembly cannot meet the performance requirements of this engine at its highest speed. Utility Model Content

[0004] To address the aforementioned issues, a high-flow-rate, low-pressure mechanical pressure reducing valve is provided, aiming to solve the problems existing in the prior art.

[0005] The specific technical solution is as follows:

[0006] A high-flow, low-pressure mechanical pressure reducing valve includes a valve body shell, a solenoid fixed valve core, a moving valve core, and an input body. The input body has three openings: the right opening is the input port, the lower opening is the output port, and the upper opening is the control port. The control port is connected to the valve body shell. The solenoid fixed valve core and the moving valve core are both disposed in the valve body shell. When the solenoid fixed valve core is de-energized, the lower end of the moving valve core is inserted into the output port to close it. When the solenoid fixed valve core is activated, the moving valve core moves upward under the action of electromagnetic force, causing the output port to open.

[0007] The aforementioned high-flow, low-pressure mechanical pressure reducing valve also has the following characteristics: the moving valve core includes a movable body, an elastic element, and a sealing head; the movable body is movably disposed in the valve body shell and can move up and down along the valve body shell; the upper end of the elastic element is connected to the movable body; the lower end of the elastic element is connected to the sealing head; and the sealing head is directly opposite the output port.

[0008] The beneficial effects of the above scheme are: when the electromagnetic fixed valve core is energized, the moving valve core moves upward as a whole, which opens the output port.

[0009] The aforementioned high-flow, low-pressure mechanical pressure reducing valve also has the following features: an extension rod is provided at the lower end of the electromagnetic valve core; an extension channel is provided at the top of the movable body; the extension rod extends into the movable body through the extension channel; and a limit block is provided on the lower end face of the extension rod, the diameter of which is larger than the diameter of the extension channel.

[0010] The beneficial effects of the above scheme are: the lower end of the extension rod has a larger diameter, and when the electromagnetic valve core is energized, the electromagnetic force drives the moving body to move upward and compress the elastic element until the output port is opened.

[0011] The aforementioned high-flow-rate low-pressure mechanical pressure reducing valve also has the following feature: a gap is reserved between the moving body and the lower end face of the electromagnetic valve core as a preset stroke, and the preset stroke is not less than 2.8 mm.

[0012] The beneficial effects of the above solution are: ensuring the preset stroke spacing, allowing the moving valve core to move a greater distance, and ensuring the opening area of ​​the output port.

[0013] The aforementioned high-flow-rate, low-pressure mechanical pressure reducing valve also has the characteristic that the number of turns of the electromagnetic coil in the electromagnetic valve core is not less than 1145.

[0014] The beneficial effects of the above solution are: since the movement distance of the moving valve core is increased, it is necessary to ensure that the force provided by the solenoid valve can drive the moving valve core.

[0015] In summary, the beneficial effects of this scheme are:

[0016] The large-flow, low-pressure mechanical pressure reducing valve provided by this utility model uses an electromagnetic fixed valve core to drive the moving valve core, thereby controlling the opening and closing of the output port and ensuring the operating stroke of the moving valve core so that the opening area of ​​the output port meets the requirements. The large-flow, low-pressure mechanical pressure reducing valve provided by this utility model improves the outlet pressure and flow rate, thus meeting the needs of naturally aspirated large-displacement engines. Attached Figure Description

[0017] Figure 1 This is a frontal cross-sectional view of the large-flow, low-pressure mechanical pressure reducing valve of this utility model.

[0018] Figure descriptions: 1. Valve body shell; 2. Input body; 3. Solenoid valve core; 4. Moving body; 5. Elastic element; 6. Sealing head. Detailed Implementation

[0019] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0020] It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0021] The present invention will be further described below with reference to specific embodiments, but this is not intended to limit the present invention.

[0022] Figure 1 This is a front sectional view of the large-flow, low-pressure mechanical pressure reducing valve of this utility model, as shown in the figure. Figure 1 As shown, the high-flow-rate low-pressure mechanical pressure reducing valve provided in this embodiment includes a valve body shell 1, an electromagnetic fixed valve core 3, a moving valve core, and an input body 2. The input body 2 has three openings: the right opening is the input port, the lower opening is the output port, and the upper opening is the control port. The control port is connected to the valve body shell 1. The electromagnetic fixed valve core 3 and the moving valve core are both disposed in the valve body shell 1. When the electromagnetic fixed valve core 3 is de-energized, the lower end of the moving valve core is inserted into the output port to close it. When the electromagnetic fixed valve core 3 is operating, the moving valve core moves upward under the action of electromagnetic force, thereby opening the output port.

[0023] In the above embodiment, the moving valve core includes a movable body 4, an elastic element 5, and a sealing head 6. The movable body 4 is movably disposed in the valve body shell 1 and can move up and down along the valve body shell 1. The upper end of the elastic element 5 is connected to the movable body 4, and the lower end of the elastic element 5 is connected to the sealing head 6. The sealing head 6 is directly opposite the output port.

[0024] In the above embodiment, the lower end of the electromagnetic valve is provided with an extension rod, the top of the movable body 4 is provided with an extension channel, the extension rod extends into the movable body 4 through the extension channel, and a limit block is provided on the lower end face of the extension rod, the diameter of the limit block is larger than the diameter of the extension channel.

[0025] It should be noted that the upper end of the elastic element 5 is connected to the limiting block. When the solenoid valve is energized, the moving body moves upward along the extension rod. At this time, the elastic element 5 is further compressed until the output port opens. When the solenoid valve is de-energized, the elastic element 5 rebounds and drives the sealing head 6 to close the output port. At this time, the elastic element 5 maintains a certain amount of compression.

[0026] In the above embodiment, a gap is reserved between the movable body 4 and the lower end face of the electromagnetic valve core 3 as a preset stroke, and the preset stroke is not less than 2.8mm.

[0027] In the above embodiment, the number of turns of the electromagnetic coil in the electromagnetic valve core 3 is not less than 1145.

[0028] It should be noted that, according to the performance requirements at the engine's highest speed, the pressure difference between the CNG natural gas outlet pressure and the engine intake manifold air intake pressure needs to be greater than 180 kPa, and the flow rate of the pressure reducing valve assembly needs to meet the CNG natural gas mass flow rate required at the engine's highest speed, which is 22 kg / h. The following three design methods are used to determine the technical solution to solve the above two problems: 1. Increase the outlet pressure setting value of the new pressure reducing valve assembly; 2. Analyze the cross-sectional area of ​​the CNG natural gas flow path from the inlet of the pressure reducing valve assembly to the outlet of the pressure reducing valve assembly in the 3D digital model of the pressure reducing valve assembly, find the minimum cross-sectional area and increase it to meet the flow rate requirement; 3. If the gap between the stationary iron core and the moving iron core of the solenoid valve needs to be increased, it is necessary to consider whether the electromagnetic force of the existing solenoid valve coil meets the solenoid valve opening voltage requirement. The electromagnetic force data model of the solenoid valve coil can be used to calculate the electromagnetic force of the new coil.

[0029] It should also be noted that, based on 3D model analysis, when the solenoid valve is energized, the flow area of ​​the existing pressure reducing valve assembly's output port is 7mm. 2 Based on the flow requirements at the engine's highest speed, the flow area opening at the output port needs to be increased to 14.7mm when the solenoid valve is energized. 2 To meet the requirement of increased flow area, the stroke of the moving valve core needs to be increased from 2.2mm to 2.8mm when the solenoid valve is energized. Due to the increased preset stroke, the electromagnetic force provided by the solenoid valve needs to be increased accordingly. According to the solenoid valve magnetomotive force formula IN=H0δ, when the air gap (δ) between the fixed and moving valve cores is 2.8mm, under the condition that the solenoid valve coil opening current (I) and the magnetic field strength (H0) at the air gap of the solenoid valve remain unchanged, the number of turns (N) of the solenoid valve coil to ensure that the moving valve core moves into place needs to be increased to 1145.

[0030] Working principle: This solution is a design modification based on the existing pressure reducing valve assembly. Most of the components of the new pressure reducing valve assembly remain unchanged. The modified components include the solenoid valve coil sub-assembly, the solenoid valve stationary iron core, and the solenoid valve guide. Therefore, the cost is low, and the outlet pressure and flow of the existing pressure reducing valve assembly are improved, so that the new pressure reducing valve assembly can meet the usage requirements of naturally aspirated large displacement engines.

[0031] The above are merely preferred embodiments of the present utility model and are not intended to limit the implementation methods and protection scope of the present utility model. Those skilled in the art should realize that any equivalent substitutions and obvious changes made based on the content of the present utility model specification should be included within the protection scope of the present utility model.

Claims

1. A high-flow-rate, low-pressure mechanical pressure reducing valve, characterized in that: The valve body includes a valve housing (1), an electromagnetic fixed valve core (3), a moving valve core, and an input body (2). The input body (2) has three openings: the right opening is the input port, the lower opening is the output port, and the upper opening is the control port. The control port is connected to the valve housing (1). The electromagnetic fixed valve core (3) and the moving valve core are both located in the valve housing (1). When the electromagnetic fixed valve core (3) is de-energized, the lower end of the moving valve core is inserted into the output port to close it. When the electromagnetic fixed valve core (3) is operating, the moving valve core moves upward under the action of electromagnetic force, causing the output port to open.

2. The large-flow, low-pressure mechanical pressure reducing valve according to claim 1, characterized in that: The moving valve core includes a movable body (4), an elastic element (5), and a sealing head (6). The movable body (4) is movably disposed in the valve body shell (1) and can move up and down along the valve body shell (1). The upper end of the elastic element (5) is connected to the movable body (4), and the lower end of the elastic element (5) is connected to the sealing head (6). The sealing head (6) is directly opposite the output port.

3. The large-flow, low-pressure mechanical pressure reducing valve according to claim 2, characterized in that: The lower end of the electromagnetic valve is provided with an extension rod, and the top of the movable body (4) is provided with an extension channel. The extension rod extends into the movable body (4) through the extension channel, and a limit block is provided on the lower end face of the extension rod. The diameter of the limit block is larger than the diameter of the extension channel.

4. A high-flow-rate, low-pressure mechanical pressure reducing valve according to claim 3, characterized in that: A gap is reserved between the movable body (4) and the lower end face of the electromagnetic valve core (3) as a preset stroke, and the preset stroke is not less than 2.8mm.

5. A high-flow-rate, low-pressure mechanical pressure reducing valve according to claim 4, characterized in that: The electromagnetic coil in the electromagnetic valve core (3) has no less than 1145 turns.

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