Gas pressure regulator of natural gas engine

Abstract

The utility model relates to the technical field of gas pressure regulators, in particular to a gas pressure regulator of a natural gas engine. The gas pressure regulator of the natural gas engine comprises a mounting disc, a throttling pipe is fixedly mounted at the bottom of the mounting disc, and a regulating assembly used for regulating the area of a throttling opening A is mounted on the mounting disc. According to the gas pressure regulator of the natural gas engine, the regulating assembly is utilized to enable the throttling opening A to form a new small-inner-diameter throttling opening, at the moment, the area of the throttling opening is reduced, the regulating precision is improved, the situation of surge or insufficient flow of the engine is avoided, and the service life of the engine is prolonged. The leaf sealing plates are driven by the micro servo motor to abut against one another to form a circular closed structure used for sealing the throttling port A, at the moment, the throttling port A is sealed, and the phenomenon that negative pressure of the intake manifold disappears when an engine flames out is avoided; and the hidden danger that gas reversely flows to the gas pressure regulator due to residual pressure in a pipeline is caused because the regulator valve is not closed in time.

Description

Technical Field

[0001] This utility model relates to the field of gas pressure regulator technology, and in particular to a gas pressure regulator for a natural gas engine. Background Technology

[0002] Existing natural gas engine gas pressure regulators mostly use mechanical valves or fixed throttling orifice structures, which have the following technical defects:

[0003] 1. Insufficient adjustment precision: Traditional valves rely on mechanical linkage or manual adjustment, making it difficult to adjust the throttling orifice area in real time according to changes in flow rate. This can easily lead to fluctuations in gas pressure, causing engine surge or insufficient gas supply.

[0004] 2. Poor sealing when the engine is off: After the engine is turned off, the negative pressure in the intake manifold disappears. If the valve closes late, the gas may flow back to the regulator due to the residual pressure in the pipeline, causing abnormal gas-fuel mixture concentration, resulting in difficulty starting, unstable idling speed, or even reduced power.

[0005] Therefore, it is necessary to provide a new gas pressure regulator for natural gas engines to solve the above-mentioned technical problems. Utility Model Content

[0006] To solve the above-mentioned technical problems, this utility model provides a natural gas engine gas pressure regulator.

[0007] The natural gas engine gas pressure regulator provided by this utility model includes an installation plate, on the bottom of which a throttling pipe is fixedly installed, and the throttling pipe is coaxially arranged with the throttling port A opened on the installation plate.

[0008] The mounting plate is equipped with an adjustment component for adjusting the area of ​​the throttling port A. The adjustment component includes a sealing plate, and multiple sealing plates are provided. Each sealing plate is rotatably mounted on the mounting plate via a rotating shaft. After the multiple sealing plates rotate and abut against adjacent sealing plates, they form a circular structure for blocking the throttling port A.

[0009] Preferably, the adjustment assembly further includes a rotating ring, which is rotatably mounted on the upper surface of the mounting plate and coaxially arranged with the throttling port A. The inner ring wall of the rotating ring is fixedly equipped with a plurality of annularly distributed arc-shaped internal teeth. Each sealing plate has a half gear fixedly mounted at its end, and the half gear meshes with the corresponding arc-shaped internal teeth.

[0010] Preferably, the outer ring wall of the rotating ring is fixedly mounted with an arc-shaped external tooth, and the arc-shaped external tooth is meshed with a gear, which is driven to rotate by a micro servo motor fixedly fitted in the mounting plate.

[0011] Preferably, the bottom of the mounting plate is provided with heat dissipation holes for cooling the micro servo motor.

[0012] Preferably, the mounting plate is covered with a plate cover, and the plate cover has a throttling port B that is coaxially arranged with the throttling port A.

[0013] Preferably, a plurality of annularly distributed guide arc-shaped protrusions are fixedly installed on the upper surface of the rotating ring, and the guide arc-shaped protrusions are staggered with the arc-shaped inner teeth. The guide arc-shaped protrusions are inserted into the arc-shaped sliding groove opened in the inner top wall of the disc cover and are slidably connected to the arc-shaped sliding groove.

[0014] Preferably, a positioning rod for connecting the plate cover is fixedly installed on the mounting plate.

[0015] Preferably, an annular sealing ring is fixedly fitted between the mounting plate and the plate cover, and the annular sealing ring is located at the outer edge of the mounting plate and the plate cover.

[0016] Preferably, the connection between the throttling tube and the throttling port A is provided with an outwardly flared transition arc surface.

[0017] Preferably, a natural gas flow sensor is provided inside the throttling port B of the disc cover.

[0018] Compared with related technologies, the natural gas engine gas pressure regulator provided by this utility model has the following advantages:

[0019] This invention utilizes an adjustment component to create a new, smaller inner diameter throttling orifice at throttling port A. This reduces the orifice area, improving adjustment accuracy and preventing engine surge or insufficient flow. Simultaneously, when the engine is stopped, a micro servo motor drives the sealing plates to abut against each other, forming a circular closed structure to seal throttling port A. This seal prevents the loss of negative pressure in the intake manifold when the engine is off, and avoids the risk of gas flowing backwards due to residual pressure in the pipeline if the regulator valve does not close in time. This also prevents abnormal gas-fuel mixture concentration, which can lead to starting difficulties, unstable idling, or reduced power. Attached Figure Description

[0020] Figure 1 A schematic diagram of a preferred embodiment of the natural gas engine gas pressure regulator provided by this utility model;

[0021] Figure 2 for Figure 1 A schematic diagram of the installation structure of the adjustment components on the installation disk shown.

[0022] Figure 3 for Figure 2 The diagram shows a cross-sectional view of the structure.

[0023] Figure 4 for Figure 1 The diagram shows the structure of the disc cover.

[0024] The following are the labels in the diagram: 1. Mounting disc; 1a. Throttling port A; 11. Positioning rod; 2. Throttling tube; 21. Transition arc surface; 3. Adjustment component; 31. Rotating ring; 32. Arc-shaped internal teeth; 33. Half gear; 34. Sealing plate; 35. Arc-shaped external teeth; 36. Gear; 37. Guide arc-shaped protrusion; 4. Disc cover; 4a. Throttling port B; 4b. Arc-shaped groove; 5. Annular sealing ring. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0026] The specific implementation of this utility model will be described in detail below with reference to specific embodiments.

[0027] Please see Figures 1 to 4 This utility model provides a natural gas engine gas pressure regulator, which includes a mounting plate 1, a throttle pipe 2, and an adjustment component 3.

[0028] In the embodiments of this utility model, please refer to Figures 1 to 4 A throttling tube 2 is fixedly installed at the bottom of the mounting plate 1, and the throttling tube 2 is coaxially arranged with the throttling port A 1a opened on the mounting plate 1;

[0029] The mounting plate 1 is equipped with an adjustment assembly 3 for adjusting the area of ​​the throttling port A 1a. The adjustment assembly 3 includes sealing plates 34, of which multiple sealing plates 34 are provided. Each sealing plate 34 is rotatably mounted on the mounting plate 1 via a rotating shaft. After the multiple sealing plates 34 rotate and abut against adjacent sealing plates 34, they form a circular structure for blocking the throttling port A 1a. The adjustment assembly 3 also includes a rotating ring 31, which is rotatably mounted on the upper surface of the mounting plate 1 and is connected to the throttling port A 1a. The flow port 1a is coaxially arranged, and the inner ring wall of the rotating ring 31 is fixedly installed with a plurality of annularly distributed arc-shaped internal teeth 32. The end of each sealing leaf plate 34 is fixedly installed with a half gear 33, and the half gear 33 meshes with the corresponding arc-shaped internal teeth 32. The outer ring wall of the rotating ring 31 is fixedly installed with an arc-shaped external teeth 35, and the arc-shaped external teeth 35 meshes with a gear 36. The gear 36 is driven to rotate by a micro servo motor fixedly fitted in the mounting plate 1.

[0030] The mounting plate 1 is covered with a plate cover 4, and the plate cover 4 has a throttling port B 4a that is coaxially arranged with the throttling port A 1a. The mounting plate 1 is fixedly installed with a positioning rod 11 for connecting the plate cover 4, and a natural gas flow sensor is installed in the throttling port B 4a of the plate cover 4.

[0031] It should be noted that: the cover 4 is fixed at the outlet of the gas pressure regulator housing, and the throttle tube 2 is connected to the engine intake pipe. The adjustment component 3 is used to make the area of ​​the throttle tube 2 of the valve core automatically adjust according to the change of flow. Specifically, when the natural gas flow sensor detects that the natural gas flow is lower than the normal flow range, the micro servo motor starts. Since the arc-shaped external tooth 35 is engaged with the gear 36, the rotating ring 31 is deflected. The half gear 33 on the sealing plate 34 is engaged with the corresponding arc-shaped internal tooth 32. Therefore, each sealing plate 34 rotates towards the axis of the throttle port A 1a until each sealing plate 34 contracts and blocks part of the throttle port A 1a, thus forming a new small inner diameter throttle port (forming a continuously variable throttle area). At this time, the throttle port area is reduced, improving the adjustment accuracy and avoiding engine surge or insufficient flow.

[0032] It should also be noted that when the engine is stopped, the micro servo motor drives the sealing plates 34 to abut against each other and form a circular closed structure for sealing the throttling port A 1a. At this time, the throttling port A 1a is sealed, which avoids the risk of the intake manifold negative pressure disappearing when the engine is turned off, and the risk of the gas flowing back to the gas pressure regulator due to the residual pressure in the pipeline because the regulator valve is not closed in time. This avoids the problem of abnormal gas mixture concentration, which can lead to difficulty in starting, unstable idling speed or power reduction.

[0033] Furthermore, multiple annularly distributed guide arc protrusions 37 are fixedly installed on the upper surface of the rotating ring 31, and the guide arc protrusions 37 are staggered with the arc-shaped inner teeth 32. The guide arc protrusions 37 are inserted into the arc-shaped sliding groove 4b opened in the inner top wall of the disc cover 4 and are slidably connected to the arc-shaped sliding groove 4b, so that the rotating ring 31 is more stable when rotating.

[0034] Furthermore, the bottom of the mounting plate 1 is provided with heat dissipation holes for heat dissipation of the micro servo motor, which improves the heat dissipation effect of the micro servo motor. The micro servo motor adopts PMM2802B, with an input voltage range of 12-30VDC, a rated voltage of 24VDC, a rated speed of 3000rpm, a rated current of 2.0A, a rated torque of 0.064N·m, a rated power of 20W, and uses a 17-bit single-turn absolute encoder.

[0035] The working principle of the natural gas engine gas pressure regulator provided by this utility model is as follows:

[0036] The cover 4 is fixed at the outlet of the gas pressure regulator housing, and the throttle tube 2 is connected to the engine intake pipe. The adjustment component 3 is used to make the area of ​​the throttle tube 2 of the valve core automatically adjust according to the change of flow. Specifically, when the natural gas flow sensor detects that the natural gas flow is lower than the normal flow range, the micro servo motor starts. Since the arc-shaped external tooth 35 is engaged with the gear 36, the rotating ring 31 is deflected. The half gear 33 on the sealing plate 34 is engaged with the corresponding arc-shaped internal tooth 32. Therefore, each sealing plate 34 rotates towards the axis of the throttle port A 1a until each sealing plate 34 contracts and blocks part of the throttle port A 1a, thus forming a new small inner diameter throttle port. At this time, the throttle port area is reduced, improving the adjustment accuracy and avoiding engine surge or insufficient flow.

[0037] When the engine is stopped, the micro servo motor drives the sealing plates 34 to abut against each other and form a circular closed structure for sealing the throttling port A 1a. At this time, the throttling port A 1a is sealed, which avoids the loss of negative pressure in the intake manifold when the engine is turned off, and the risk of gas flowing back to the gas pressure regulator due to the residual pressure in the pipeline because the regulator valve is not closed in time. This avoids the problem of abnormal gas mixture concentration, which can lead to difficulty in starting, unstable idling or reduced power.

[0038] In this invention, a natural gas flow sensor is integrated into the B port 4a of the throttling device. It monitors the flow rate in real time and is linked with a micro servo motor to achieve closed-loop control, further optimizing the adjustment accuracy and dynamic response. The circuits and controls involving the natural gas flow sensor and the micro servo motor are existing technologies and will not be described in detail here.

[0039] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the content of this utility model specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A natural gas engine fuel gas pressure regulator characterized by, Including installation disc (1), bottom fixed mounting throttle pipe (2) is arranged coaxially with throttle A mouth (1a) of installation disc (1) is opened; The installation disc (1) is installed with the adjusting assembly (3) for adjusting the area of throttle A mouth (1a), and the adjusting assembly (3) includes a plurality of sealing leaf plates (34), each sealing leaf plate (34) is rotatably installed on the installation disc (1) by a rotating shaft, and the plurality of sealing leaf plates (34) are rotatable and abutted with adjacent sealing leaf plates (34) to form a circular structure for blocking throttle A mouth (1a).

2. A natural gas engine fuel gas pressure regulator as set forth in claim 1, characterized by, The adjusting assembly (3) further includes a rotating ring (31) rotatably installed on the upper disc surface of the installation disc (1) and coaxially arranged with the throttle A mouth (1a), and a plurality of arc-shaped inner teeth (32) are fixedly installed on the inner ring wall of the rotating ring (31), and a half gear (33) is fixedly installed at the end of each sealing leaf plate (34), and the half gear (33) is engaged with the corresponding arc-shaped inner teeth (32).

3. A natural gas engine fuel gas pressure regulator as set forth in claim 2 wherein, The outer ring wall of the rotating ring (31) is fixedly installed with an arc-shaped outer tooth (35), and the arc-shaped outer tooth (35) is engaged with a gear (36), and the gear (36) is driven to rotate by a micro servo motor fixedly embedded in the installation disc (1).

4. The natural gas engine fuel gas pressure regulator of claim 3, wherein, The bottom of the installation disc (1) is provided with a heat dissipation hole for heat dissipation of the micro servo motor.

5. The natural gas engine fuel gas pressure regulator of claim 2, wherein, The installation disc (1) is covered with a disc cover (4), and the disc cover (4) is provided with a throttle B mouth (4a) coaxially arranged with the throttle A mouth (1a).

6. A natural gas engine fuel gas pressure regulator as set forth in claim 5, characterized by, The upper surface of the rotating ring (31) is fixedly installed with a plurality of arc-shaped guide protrusions (37) arranged in a ring shape, and the arc-shaped guide protrusions (37) are arranged alternately with the arc-shaped inner teeth (32), the arc-shaped guide protrusions (37) are inserted into the arc-shaped sliding groove (4b) of the inner top wall of the disc cover (4) and are slidably connected with the arc-shaped sliding groove (4b).

7. The natural gas engine fuel gas pressure regulator of claim 1, wherein, The installation disc (1) is fixedly installed with a positioning rod (11) for connecting the disc cover (4).

8. The natural gas engine fuel gas pressure regulator of claim 1, wherein, The installation disc (1) and the disc cover (4) are fixedly embedded with a ring-shaped sealing ring (5), and the ring-shaped sealing ring (5) is located at the outer edge of the installation disc (1) and the disc cover (4).

9. The natural gas engine fuel gas pressure regulator of claim 1, wherein, The throttle pipe (2) is provided with an outwardly expanded transition arc surface (21) at the connection with the throttle A mouth (1a).

10. The natural gas engine fuel gas pressure regulator of claim 5, wherein, The throttle B mouth (4a) of the disc cover (4) is provided with a natural gas flow sensor.

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