Overspeed air cut valve for diesel engine

Abstract

The utility model relates to the technical field of overspeed protection devices, in particular to an overspeed air cut-off valve for a diesel engine, which comprises an air inlet pipeline, a sealing valve plate is mounted in the air inlet pipeline, a driving source for driving the sealing valve plate to rotate is arranged outside the air inlet pipeline, the driving source adopts a direct current motor and a speed reducer, and the speed reducer is connected with the sealing valve plate through a transmission shaft. The locking device is arranged on the transmission shaft, the sealing valve plate can be prevented from being restarted when the air inlet pipeline is in the air cut-off stage through the locking device, and compared with an automatic reset design adopted by an existing air cut-off valve, the situation that equipment damage is aggravated due to repeated starting and stopping when faults are not eliminated is avoided; mechanical locking can be carried out through the locking device, unlocking can be carried out by matching with manual operation, and the safety coefficient of overhauling and replacing operation is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to diesel engine overspeed protection device technical field, concretely relates to a diesel engine overspeed cut-off valve. BACKGROUND

[0002] Diesel engine overspeed is one of the main reasons for causing equipment damage and even explosion accidents. In the prior art, overspeed protection is mostly dependent on electronic control system to cut off fuel or adjust fuel injection quantity, however, the way of cutting off oil supply has hysteresis and cannot achieve timely shutdown,

[0003] Chinese patent (application number 201720898454.4) provides a diesel engine overspeed protection system, which comprises a diesel engine, an air inlet pipe, an air outlet pipe, a turbocharger, an air throttle valve, an oil pump, an oil injector, and further comprises an overspeed protection controller. Since the existence of overspeed phenomenon is indicated when the engine speed exceeds the set threshold, the overspeed protection controller controls the air throttle valve to be closed, so that the engine lacks oxygen and cannot burn oil, and the diesel engine is forced to stop working, thus the engine speed can be rapidly reduced. That is to say, even if the oil pump and the oil injector are out of control and cannot reduce the oil intake of the engine, or the turbocharger leaks oil and causes uncontrollable oil inflow into the engine, the engine overspeed problem can still be effectively solved by using the utility model.

[0004] Although rapid shutdown can be achieved by cutting off gas, but during use, due to the use of a large number of electronic components, the cut-off valve is reset, and the phenomenon of repeated operation occurs, which brings great inconvenience to maintenance, UTILITARIAN CONTENT

[0005] In order to solve the above problems, the utility model embodiment provides a diesel engine overspeed cut-off valve with a locking structure, which can avoid connecting the gas source in an unauthorized state after the gas source is cut off, ensure the stability of the air cut-off state, and ensure the safe performance of the maintenance operation.

[0006] In order to achieve the above purpose, the utility model embodiment specifically adopts the following technical scheme: a diesel engine overspeed cut-off valve, comprising a cut-off module and a detection module, the cut-off module comprising an air inlet pipe, a sealing valve plate is arranged in the air inlet pipe, an external drive source is arranged, a transmission shaft is arranged between the drive source and the sealing valve plate, and a locking device is arranged on the transmission shaft.

[0007] As a further improvement of the above technical scheme:

[0008] The locking device comprises a ratchet wheel arranged on the transmission shaft, an installation bracket is arranged on the outer side of the air inlet pipe, a pawl matched with the ratchet wheel is arranged on the installation bracket, and an adjusting device for driving the pawl to reset is arranged on the installation bracket.

[0009] The adjusting device comprises an adjusting sleeve, a connecting rod connected with the pawl is arranged in the adjusting sleeve, an upper part of the connecting rod is provided with an adjusting handle, and an outer part of the connecting rod is provided with a reset spring.

[0010] An upper part of the adjusting sleeve is provided with a baffle abutting against a top part of the reset spring, and the connecting rod is provided with a limiting block abutting against a lower part of the reset spring.

[0011] The driving source comprises a DC motor, and an output end of the DC motor is provided with a speed reducer.

[0012] The detection module comprises a controller and a detection probe, and the controller is electrically connected with the detection probe and the speed reducer respectively.

[0013] The diesel engine overspeed cut-off valve has the advantages that: the diesel engine overspeed cut-off valve comprises an air inlet pipeline, a sealing valve plate is arranged in the air inlet pipeline, an external driving source is arranged for driving the sealing valve plate to rotate, the driving source is a DC motor and a speed reducer, the speed reducer and the sealing valve plate are connected through a transmission shaft, a locking device is arranged on the transmission shaft, the locking device can prevent the sealing valve plate from being opened when the air inlet pipeline is in the cut-off stage, compared with the automatic reset design of the existing cut-off valve, the phenomenon of repeated start and stop when a fault is not eliminated is avoided, the equipment damage is not aggravated, the locking device can be mechanically locked, manual unlocking is required, and the safety factor of maintenance and replacement operation is improved. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a whole structure schematic view of the utility model;

[0015] Figure 2 It is a structure schematic view in the utility model;

[0016] Figure 3 It is a structure schematic view of the utility model.

[0017] In the drawing: 1, air inlet pipeline; 2, sealing valve plate; 3, driving source; 4, transmission shaft; 5, ratchet wheel; 6, mounting bracket; 7, pawl; 8, adjusting sleeve; 9, connecting rod; 10, adjusting handle; 11, reset spring; 12, baffle; 13, limiting block; 14, DC motor; 15, speed reducer; 16, controller; 17, detection probe. DETAILED DESCRIPTION

[0018] The preferred embodiments of the utility model are described below with reference to the drawings. Those skilled in the art should understand that these embodiments are only used to explain the technical principles of the utility model, and are not intended to limit the protection scope of the utility model.

[0019] Referring toFigure 1 This utility model discloses an overspeed shut-off valve for diesel engines, including an intake pipe 1, a sealing valve plate 2 installed inside the intake pipe 1, and an external drive source 3 for rotating the sealing valve plate 2. The drive source 3 adopts a DC motor 14 and a reducer 15. The reducer 15 and the sealing valve plate 2 are connected by a transmission shaft 4. A locking device is provided on the transmission shaft 4. The locking device can prevent the sealing valve plate 2 from restarting when the intake pipe 1 is in the shut-off stage. Compared with the existing shut-off valve with automatic reset design, it will not repeatedly start and stop when the fault is not eliminated, which will aggravate equipment damage. The locking device can mechanically lock the valve, which requires manual unlocking, thus improving the safety factor of maintenance and replacement operations.

[0020] like Figure 2 As shown, the locking device includes a ratchet 5 sleeved on the drive shaft 4, a mounting bracket 6 on the outside of the air intake pipe 1, and a pawl 7 on the mounting bracket 6. The ratchet 7 and the ratchet 5 are used to lock the drive shaft 4 to prevent the drive shaft 4 from automatically resetting the sealing valve plate 2. The mounting bracket 6 is provided with an adjustment device for adjusting the position of the pawl 7, which is used to manually adjust the position of the pawl 7 and then reset the sealing valve plate 2.

[0021] like Figure 3 As shown, the adjustment device includes an adjustment sleeve 8, a connecting rod 9 slidably installed inside the adjustment sleeve 8, the lower end of the connecting rod 9 being connected to a pawl 7, and an adjustment handle 10 extending above the adjustment sleeve 8 at the upper part. A return spring 11 is sleeved in the middle of the connecting rod 9, and a limiting block abutting against the lower end of the return spring 11 is provided on the outer wall of the connecting rod 9. A baffle 12 abutting against the upper end of the return spring 11 is provided at the upper part of the adjustment sleeve 8. Without human intervention, the return spring 11 pushes the pawl 7 downward to limit the ratchet 5 as the ratchet 5 rotates, thereby locking the drive shaft 4 and preventing it from resetting the sealing valve plate 2. When the sealing valve plate 2 needs to be reset to restore the ventilation state after maintenance, the adjustment handle 10 is pulled upward, the return spring 10 is compressed, and the pawl 7 moves upward and disengages from the pawl 5. At this time, the drive source 3 drives the sealing valve plate 2 to reset and restore ventilation.

[0022] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In addition, it needs to be explained that, in the description of the utility model, unless another explicit provision and limitation, the term "mount", "link", "connect" should be broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected; can be mechanical connection, also can be electrical connection; can be directly connected, also can pass through the indirect connection of intermediate medium, can be two element internal communication. For the person skilled in the art, the specific meaning of the above-mentioned terms in the utility model can be understood according to the specific circumstances.

[0024] The term "comprising" or any other similar word is intended to encompass a non-exclusive inclusion, such that a process, article, or apparatus / device that comprises a list of elements is not limited to those elements, but can include other elements not expressly listed, or also include elements inherent in the process, article, or apparatus / device.

[0025] So far, the technical scheme of the utility model has been described in combination with the preferred embodiments shown in the drawings, but the person skilled in the art can easily understand that the protection scope of the utility model is obviously not limited to these specific embodiments. Without deviating from the principles of the utility model, the person skilled in the art can make equivalent changes or replacements to the related technical features, and the technical schemes after these changes or replacements will fall within the protection scope of the utility model.

Claims

1. An over-speed cut-off valve for a diesel engine, comprising a cut-off module and a detection module, characterized in that: The cutting module comprises an air inlet pipeline (1), a sealing valve plate (2) is arranged in the air inlet pipeline (1), an external driving source (3) is arranged, a transmission shaft (4) is arranged between the driving source (3) and the sealing valve plate (2), and a locking device is arranged on the transmission shaft (4); The locking device comprises a ratchet wheel (5) arranged on the transmission shaft (4), an installation support (6) is arranged on the outer side of the air inlet pipeline (1), a pawl (7) that is used in cooperation with the ratchet wheel (5) is arranged on the installation support (6), and an adjusting device for driving the pawl (7) to reset is arranged on the installation support (6); The adjusting device comprises an adjusting sleeve (8), a connecting rod (9) connected with the pawl (7) is arranged in the adjusting sleeve (8), an adjusting handle (10) is arranged on the upper portion of the connecting rod (9), and a reset spring (11) is arranged on the outer portion of the connecting rod (9).

2. The over-speed cut-out valve for a diesel engine according to claim 1, characterized by: The upper portion of the adjusting sleeve (8) is provided with a baffle (12) abutting against the top portion of the reset spring (11), and a limiting block (13) abutting against the lower portion of the reset spring (11) is arranged on the connecting rod (9).

3. The over-speed cut-out valve for a diesel engine according to claim 1, characterized by: The driving source (3) comprises a direct current motor (14), and a speed reducer (15) is arranged at the output end of the direct current motor (14).

4. The over-speed cut-out valve for a diesel engine according to claim 3, characterized by: The detection module comprises a controller (16) and a detection probe (17), and the controller (16) is electrically connected with the detection probe (17) and the speed reducer (15) respectively.

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