Distribution device for air starting of engine

Abstract

The utility model provides a distribution device for engine air starting, which comprises an air distribution valve and a cylinder body starting valve, the air distribution valve comprises a distribution valve body, a cylinder sequence distribution plate is arranged in the distribution valve body, a cover plate is arranged on the end face of the distribution valve body, the cover plate is provided with a main air inlet hole, the cylinder sequence distribution plate is provided with a distribution opening, and the distribution opening is communicated with the main air inlet hole. The cylinder sequence distribution plate is connected with a power shaft, six air outlet holes are evenly distributed in the end face of a distribution valve body in the circumferential direction, the six air outlet holes are connected with the cylinder body starting valves through air pipes respectively, each cylinder body starting valve comprises a starting valve body, a positioning column is arranged at the end of the starting valve body, and a ventilation cavity penetrating through the interior of the positioning column is formed in the starting valve body. A slidable valve needle is arranged in the ventilation cavity, a plug is arranged at the end of the valve needle, and a spring used for resetting is arranged on the valve needle. The device has the advantages of reasonable structural design, convenience in pipeline arrangement, convenience in disassembly and assembly and the like.

Description

Technical Field

[0001] The utility model mainly relates to the technical field related to engine air starting, in particular to a distribution device used for engine air starting. Background Art

[0002] For some diesel engines, they need to reach a certain speed with the cooperation of an external starting device before they can ignite and start. The external starting device can be an electric motor or an air starting system.

[0003] The existing 24V electric motor starting method has the problem of insufficient voltage of the electric motor due to battery depletion in extremely cold environments, making it difficult or even impossible to start the engine. Overheating of the electric motor due to long-term operation can cause a short circuit in the motor coil, shortening or damaging the electric motor, thus preventing the engine from starting. Therefore, an air starting system is required in some special usage scenarios.

[0004] The compressed air starting method has high starting efficiency, quick response, low maintenance cost, and can achieve long-term engine starting. The process of compressed air starting is generally to allow compressed air to enter the cylinder body in sequence through an air distributor in the ignition order. The power acting on the piston surface is transmitted to the engine crankshaft through the connecting rod to rotate it. The crankshaft rotation then drives the next cylinder in the compression stroke to work, allowing the diesel injected into the cylinder to ignite and start the engine. To this end, it is necessary to set a corresponding starting valve at the cylinder body. When compressed air is introduced, the starting valve opens to allow air to enter the cylinder body.

[0005] In the prior art, the structural design of the air distribution valve and the cylinder start valve makes the air pipe layout complicated and inconvenient to disassemble and assemble, and the air distribution valve and the start valve generally adopt an integrated structural design. For the electric start structure, if it is to be designed and modified into a dual start mode (electric and air start), it is necessary to separately configure the corresponding distribution valve and start valve. Therefore, it is particularly important to provide a distribution device with excellent performance, easy installation and maintenance for the air start modification of the engine. Utility Model Content

[0006] The purpose of the utility model is to provide a distribution device for engine air starting to solve the above technical problems.

[0007] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0008] A distribution device for engine air starting comprises an air distribution valve and a cylinder starting valve, the air distribution valve comprising a distribution valve body, a cylinder sequence distribution plate is arranged in the distribution valve body, a cover plate is arranged on the end face of the distribution valve body, the cover plate has a main air inlet hole, the cylinder sequence distribution plate has a distribution port, the cylinder sequence distribution plate is connected to a power shaft, six air outlet holes are evenly distributed on the end face of the distribution valve body in a circumferential direction, the six air outlet holes are respectively connected to one of the cylinder starting valves through an air pipe, the cylinder starting valve comprises a starting valve body, a positioning column is arranged at the end of the starting valve body, a ventilation cavity penetrating the interior of the positioning column is arranged inside the starting valve body, a slidable valve needle is arranged in the ventilation cavity, a plug is arranged at the end of the valve needle, the plug is located outside the end of the positioning column, a spring for resetting is arranged on the valve needle, an air pipe structure connected to the ventilation cavity is arranged outside the starting valve body, and a plurality of mounting holes are arranged circumferentially on the end face of the starting valve body.

[0009] Preferably, a gas distribution cavity is arranged on the end face of the valve body of the distribution valve, and six auxiliary air inlets are arranged on the inner end face of the gas distribution cavity, the six auxiliary air inlets are respectively connected with the corresponding air outlet holes, the cylinder sequence distribution plate is arranged in the gas distribution cavity, the cover plate is installed on the gas distribution cavity through threads, and the six air outlet holes are located outside the gas distribution cavity.

[0010] Preferably, a power shaft mounting hole is also provided on the distribution valve body, the power shaft mounting hole is connected to the gas distribution cavity, the power shaft passes through the power shaft mounting hole, and an oil pipe joint is provided outside the distribution valve body, and the oil pipe joint is connected to the power shaft mounting hole through a fine hole.

[0011] Preferably, three mounting ears are circumferentially arranged on the valve body of the distribution valve, and the mounting ears are provided with mounting long holes. A connecting disk is arranged on one end of the power shaft extending out of the valve body of the distribution valve, and a valve timing positioning pin is arranged on the connecting disk.

[0012] Preferably, the starting valve body includes a first valve body and a second valve body, the ventilation cavity is arranged on the first valve body, a spring cavity is arranged on one side of the ventilation cavity, a spring is installed in the spring cavity, and the second valve body is installed at one end of the first valve body to close the spring cavity.

[0013] Preferably, a partition is arranged between the ventilation cavity and the spring cavity, and a through hole for the valve needle to pass through is arranged on the partition.

[0014] Preferably, the valve needle is provided with a thread on one side of the spring cavity, an adjusting nut is installed on the thread, one end of the spring is tightened on the partition, and the other end is tightened on the adjusting nut, and the second valve body is provided with a cavity for accommodating the adjusting nut at one end close to the first valve body.

[0015] Preferably, a guide boss is provided on the valve needle, a plurality of ventilation grooves are evenly distributed on the guide boss in the circumferential direction, and an outer ring of the guide boss is slidably fitted with the ventilation cavity.

[0016] Preferably, the plug of the valve needle and the end surface of the positioning column cooperate with each other through a 45° conical surface.

[0017] Preferably, the first valve body and the second valve body are connected by screws, and a sealing gasket is provided at the connection between the first valve body and the second valve body.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. The structural design of the distribution device of the utility model can pass the compressed air into the cylinder body according to the ignition sequence, so as to realize the air start of the engine. The air distribution valve and cylinder start valve adopted by the distribution device have reasonable structural design, which is convenient for the arrangement of pipelines, and is particularly suitable for the dual start (electric and pneumatic) structure of the engine;

[0020] 2. The air distribution valve of the utility model has a reasonable structural design, flexible movement, and is easy to disassemble and maintain. The cylinder start valve is composed of a first valve body and a second valve body. The first valve body is structurally designed to have a positioning column that matches the cylinder body, which can facilitate the precise installation of the start valve. Its structural design allows the valve to open under a specific pressure, and compressed air to enter the cylinder body. When the external compressed air pressure is insufficient, the valve body can be securely closed to prevent the high-pressure gas that explodes in the cylinder from leaking out through the start valve;

[0021] 3. In the utility model, the combined structural design of the first valve body and the second valve body of the starting valve can facilitate the disassembly and assembly of the starting valve. At the same time, when opening the second valve body, the preload force of the spring can be adjusted by adjusting the nut to adjust the force of the valve opening. It has the advantages of convenient and fast debugging and easy disassembly and assembly. The valve needle of the starting valve can perform precise telescopic movement, and radial displacement is avoided in its radial direction by the corresponding limiting structure. Therefore, the valve has good movement flexibility and good sealing effect when opening and closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Attached Figure 1 It is a schematic diagram of the principle of the utility model.

[0023] Attached Figure 2 The overall structure of the air distribution valve is shown in Figure 2. Figure 1 .

[0024] Attached Figure 3 The overall structure of the air distribution valve is shown in Figure 2. Figure 2 .

[0025] Attached Figure 4 This is a schematic diagram of the cylinder sequence distribution plate installation status.

[0026] Attached Figure 5 This is a schematic diagram of the power shaft installation status.

[0027] Attached Figure 6 Schematic diagram of the valve body structure of the distribution valve.

[0028] Attached Figure 7 The overall structure of the cylinder start valve is shown in Figure 1. Figure 1 .

[0029] Attached Figure 8 The overall structure of the cylinder start valve is shown in Figure 1. Figure 2 .

[0030] Attached Fig. 9 This is a schematic diagram of the cross-sectional structure of the cylinder start valve.

[0031] Attached Fig.10 This is a schematic diagram of the structure of the first valve body of the cylinder start valve.

[0032] Attached Fig.11 This is a schematic diagram of the structure of the cylinder start valve needle.

[0033] In the figure: 1. air distribution valve; 11. distribution valve body; 12. cover plate; 13. air outlet; 14. main air inlet; 15. mounting ear; 16. connecting plate; 17. valve timing phase locating pin; 18. oil pipe joint; 19. cylinder sequence distribution plate; 110. distribution port; 111. power shaft; 112. auxiliary air inlet; 113. fine hole; 2. cylinder start valve; 21. first valve body; 22. second valve body; 23. valve needle; 24. air pipe joint; 25. mounting hole; 26. hexagon screw; 27. plug; 28. guide boss; 29. ​​ventilation cavity; 210. spacer; 211. spring cavity; 212. spring; 213. adjusting nut; 214. sealing gasket; 215. positioning column. DETAILED DESCRIPTION

[0034] The utility model is further described in conjunction with the accompanying drawings and specific embodiments. It should be understood that these embodiments are only used to illustrate the utility model and are not used to limit the scope of the utility model. In addition, it should be understood that after reading the content taught by the utility model, those skilled in the art can make various changes or modifications to the utility model, and these equivalent forms also fall within the scope defined by this application.

[0035] refer to Figure 1 As shown, the distribution device used for the air start of the engine described in this embodiment includes an air distribution valve 1 and a cylinder start valve 2. The air distribution valve 1 is connected to the corresponding cylinder start valve 2 through 6 pipes. The air distribution valve 1 is mainly used to distribute compressed air according to the ignition sequence. The installation sequence is to pass the compressed air into the cylinder start valve 2, and then spray it into the cylinder through the cylinder start valve 2.

[0036] refer to Figure 2-Figure 6As shown, the air distribution valve 1 includes a distribution valve body 11, a distribution cavity is arranged on the end face of the distribution valve body 11, six auxiliary air inlets 112 are arranged on the inner end face of the distribution cavity, and the six auxiliary air inlets 112 are respectively connected with six air outlets 13 on the circumferential direction of the end face of the distribution valve body 11, a cylinder sequence distribution plate 19 is arranged in the distribution valve body 11, a cover plate 12 is arranged on the end face of the distribution valve body 11 for closing the distribution cavity, a main air inlet 14 is arranged on the end face of the cover plate 12, a distribution port 110 is arranged on the cylinder sequence distribution plate 19, and the cylinder sequence distribution plate 19 is connected to the power shaft 111.

[0037] Under the action of the power shaft 111, the cylinder sequence distribution plate 19 is driven to rotate. When the distribution port 110 corresponds to a certain auxiliary air inlet 112, the compressed air of the main air inlet hole 14 enters the auxiliary air inlet 112 through the distribution port 11, and then is ejected from the corresponding air outlet 13, and then enters the corresponding cylinder start valve 2 through the pipeline, and enters the cylinder through the cylinder start valve 2.

[0038] In this embodiment, three mounting ears 15 are circumferentially arranged on the distribution valve body 11, and the mounting ears 15 have mounting slots, so that the air distribution valve 1 can be conveniently fixed to the gear chamber through the mounting ears 15. The power shaft 111 extends out of the distribution valve body 11 at one end, and a connecting plate 16 is arranged at the end, and two valve timing positioning pins 17 are arranged on the connecting plate 16 for connecting to the oil pump gear.

[0039] In this embodiment, a power shaft mounting hole is also provided on the distribution valve body 11, and the mounting hole of the power shaft 111 is connected to the gas distribution cavity. An oil pipe joint 18 is provided outside the distribution valve body 11, and the oil pipe joint 18 is connected to the power shaft mounting hole through a fine hole 113, so as to provide lubrication for the power shaft 111.

[0040] The cylinder start valve 2 of this embodiment mainly includes a first valve body 21 and a second valve body 22. The second valve body 22 is installed on the rear end surface of the first valve body 21, and the two are connected by a hexagonal screw 26. In a specific structure provided in this embodiment, the first valve body 22 and the upper half of the second valve body 22 are both cylindrical structures, and the lower surface adopts a flat structure to facilitate the installation of the start valve. At the same time, in this embodiment, 22 through mounting holes 25 are circumferentially arranged on the end surfaces of the first valve body 21 and the second valve body 22, which are used to install the start valve on the cylinder.

[0041] A positioning column 215 is provided at the end of the first valve body 21 of the present embodiment. The positioning column 215 is a cylindrical structure as a whole and is integrally formed with the first valve body 21. The positioning column 215 is mainly used for the installation and positioning of the starter valve. During assembly, it is installed in the cylinder to ensure the installation accuracy of the starter valve. A ventilation cavity 29 is provided in the first valve body 21 to pass through the interior of the positioning column 215. An air pipe joint 24 is provided outside the first valve body 21. The interior of the air pipe joint 24 is connected to the ventilation cavity 29, and the exterior is connected to the air distribution valve through a pipeline so that compressed air can enter the ventilation cavity 29. A slidable valve needle 23 is provided in the ventilation cavity 29. The end of the valve needle 23 has a plug 27. The plug 27 is located outside the positioning column 215. The air outlet at the end of the positioning column 215 can be closed by the plug 27. When the valve needle 23 moves outward, the plug 27 opens the air outlet at the end of the positioning column 215, so that compressed air can enter the cylinder body. When the valve needle 23 moves inward, the plug 27 closes the air outlet at the end of the positioning column 15, which can prevent the high-pressure gas exploded in the cylinder from leaking out through the valve.

[0042] In this embodiment, a spring chamber 211 is provided on one side of the vent chamber 29 inside the first valve body 21. The vent chamber 29 and the spring chamber 211 are separated by a partition 210. However, the partition 210 has a corresponding through hole to allow the other end of the valve needle 23 to enter the spring chamber 211. A spring 212 is provided in the spring chamber 211. The spring 212 is sleeved on the outside of the valve needle 23. One end of the spring contacts the end surface of the partition 210, and the other end contacts the adjusting nut 213. The adjusting nut 213 is threadedly mounted on the valve needle 23. Through the above structure, the spring 212 can exert force on the valve needle 23, so that the valve needle 23 has an inward pre-tightening force, so that the plug 27 closes the end of the positioning column 215. When high-pressure air passes through, the pressure in the vent chamber 29 increases, pushing the plug 27 to move outward. After overcoming the elastic force of the spring 212, the plug 27 will be opened. Therefore, the above structural design of this embodiment can only open the starter valve when the compressed air pressure reaches the set pressure. In this embodiment, by changing the position of the adjusting nut 213 on the valve needle 23, the preload force of the spring 212 can be adjusted, thereby controlling different opening pressures, so that the starter valve has strong versatility and high adjustability, and is convenient for on-site debugging. For example, when the opening pressure is set to 0.8MPA by changing the position of the adjusting nut 213, the valve can only be opened when the pressure in the ventilation cavity 29 is greater than 0.8MPA.

[0043] In this embodiment, the second valve body 22 is connected to the first valve body 21 by a hexagonal screw 26. After the second valve body 22 is removed, the adjusting nut 213 can be easily adjusted. At the same time, in order to ensure the sealing, a sealing gasket 214 is arranged between the first valve body 21 and the second valve body 22.

[0044] The valve needle 23 moves in the ventilation cavity 28. In order to ensure the flexibility and stability of the movement of the valve needle 23, a guide boss 28 is provided on the valve needle 23. The guide boss 28 has a plurality of ventilation grooves evenly distributed around the circumference. The outer ring of the guide boss 28 is slidably fitted with the ventilation cavity 29. The ventilation grooves can allow the gas in the ventilation cavity 29 to enter the position of the plug 27. The setting of the guide boss 28 ensures the flexibility and stability of the movement of the valve needle 23.

[0045] Contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0046] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art may still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. A distribution device for engine air starting, comprising an air distribution valve and a cylinder starting valve, characterized in that: The air distribution valve comprises a distribution valve body, a cylinder sequence distribution plate is arranged in the distribution valve body, a cover plate is arranged on the end face of the distribution valve body, the cover plate has a main air inlet hole, the cylinder sequence distribution plate has a distribution port, the cylinder sequence distribution plate is connected to the power shaft, the end face of the distribution valve body is evenly distributed with six air outlet holes in the circumferential direction, the six air outlet holes are respectively connected to one of the cylinder starting valves through an air pipe, the cylinder starting valve comprises a starting valve body, a positioning column is arranged at the end of the starting valve body, a ventilation cavity which passes through the interior of the positioning column is arranged inside the starting valve body, a slidable valve needle is arranged in the ventilation cavity, a plug is arranged at the end of the valve needle, the plug is located on the outside of the end of the positioning column, a spring for resetting is arranged on the valve needle, an air pipe structure which is connected to the ventilation cavity is arranged outside the starting valve body, and a plurality of mounting holes are arranged circumferentially on the end face of the starting valve body.

2. The distribution device for engine air starting according to claim 1, characterized in that: The end face of the distribution valve body is provided with a distribution cavity, and the inner end face of the distribution cavity is provided with six auxiliary air inlets, which are respectively connected with corresponding air outlets. The cylinder sequence distribution plate is provided in the distribution cavity, and the cover plate is installed on the distribution cavity through threads, and the six air outlets are located outside the distribution cavity.

3. The distribution device for engine air starting according to claim 2, characterized in that: The distribution valve body is also provided with a power shaft mounting hole, which is connected to the gas distribution cavity, and the power shaft passes through the power shaft mounting hole. An oil pipe joint is arranged outside the distribution valve body, and the oil pipe joint is connected to the power shaft mounting hole through a fine hole.

4. The distribution device for engine air starting according to claim 3, characterized in that: The valve body of the distribution valve is provided with three mounting ears in the circumference thereof, and the mounting ears are provided with mounting long holes. A connecting disk is provided at one end of the power shaft extending out of the valve body of the distribution valve, and a valve distribution phase positioning pin is provided on the connecting disk.

5. The distribution device for engine air starting according to claim 1, characterized in that: The starting valve body includes a first valve body and a second valve body. The ventilation cavity is arranged on the first valve body. A spring cavity is arranged on one side of the ventilation cavity. A spring is installed in the spring cavity. The second valve body is installed at one end of the first valve body to close the spring cavity.

6. The distribution device for engine air starting according to claim 5, characterized in that: A partition is arranged between the ventilation cavity and the spring cavity, and a through hole for the valve needle to pass through is arranged on the partition.

7. The distribution device for engine air starting according to claim 6, characterized in that: The valve needle is provided with a thread on one side of the spring cavity, and an adjusting nut is installed on the thread. One end of the spring is pressed against the partition, and the other end is pressed against the adjusting nut. The second valve body is provided with a cavity for accommodating the adjusting nut at one end close to the first valve body.

8. The distribution device for engine air starting according to claim 5, characterized in that: The valve needle is provided with a guide boss, and a plurality of ventilation grooves are evenly distributed on the guide boss in the circumferential direction. The outer ring of the guide boss is slidably matched with the ventilation cavity.

9. The distribution device for engine air starting according to claim 5, characterized in that: The plug of the valve needle and the end surface of the positioning column cooperate with each other through a 45° cone surface.

10. The distribution device for engine air starting according to claim 5, characterized in that: The first valve body is connected to the second valve body by screws, and a sealing gasket is arranged at the connection between the first valve body and the second valve body.

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