Cylinder body starting valve

Abstract

The utility model discloses a cylinder body starting valve which comprises a first valve body and a second valve body, a positioning column is arranged at the end of the first valve body, a ventilation cavity penetrating through the interior of the positioning column is formed in the first valve body, a slidable valve needle is arranged in the ventilation cavity, and a plug at the end of the valve needle is located outside the positioning column. A spring cavity is formed in the first valve body and located on one side of the ventilation cavity, a spring is arranged in the spring cavity, the valve needle is sleeved with the spring and used for applying force to the valve needle, an air pipe connector is arranged outside the first valve body and communicated with the ventilation cavity, and the second valve body is installed at the end of the first valve body and used for sealing the spring cavity. A plurality of through mounting holes are circumferentially formed in the end surfaces of the first valve body and the second valve body. The starting valve has the advantages of being convenient and fast to install, good in sealing performance, convenient to maintain, adjustable in air inlet pressure 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 cylinder starting valve. 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 to start the engine. The engine cannot start. The electric motor will overheat after running for a long time, which will cause the motor coil to short-circuit and damage the electric motor, thus causing the engine to fail to start. Therefore, in some special usage scenarios, an air starting system needs to be configured.

[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, for the engine structure with dedicated air start, the cylinder start valve generally adopts an integrated structure design. For the electric start structure, if it is to be designed and modified into a dual start mode (electric and air start), a corresponding start valve needs to be configured separately. Therefore, it is particularly important to provide a cylinder start valve with excellent performance, easy installation and maintenance. Utility Model Content

[0006] The purpose of the utility model is to provide a cylinder starting valve to solve the technical problems raised in the background technology.

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

[0008] A cylinder starting valve comprises a first valve body and a second valve body, a positioning column is arranged at the end of the first valve body, a ventilation cavity is arranged in the first valve body and passes through the interior of the positioning column, a slidable valve needle is arranged in the ventilation cavity, a plug at the end of the valve needle is located outside the positioning column, a spring cavity is arranged in the first valve body on one side of the ventilation cavity, a spring is arranged in the spring cavity, the spring sleeve is arranged on the valve needle for applying force to the valve needle, an air pipe joint is arranged outside the first valve body, the air pipe joint is communicated with the ventilation cavity, the second valve body is installed at the end of the first valve body for closing the spring cavity, and a plurality of through mounting holes are arranged circumferentially on the end faces of the first valve body and the second valve body.

[0009] 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.

[0010] 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 pressed against the partition, and the other end is pressed against the adjusting nut.

[0011] Preferably, a cavity capable of accommodating the adjusting nut is provided at one end of the second valve body close to the first valve body.

[0012] 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.

[0013] Preferably, the first valve body and the second valve body are connected by screws.

[0014] Preferably, the plug of the valve needle and the end surface of the positioning column cooperate with each other through a 45° conical surface.

[0015] Preferably, a sealing gasket is provided at the connection between the first valve body and the second valve body.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The first valve body is designed with a positioning column that matches the cylinder body, which can facilitate the precise installation of the starter valve. Its structural design allows the valve to open under a specific pressure, allowing 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 starter valve;

[0018] The combined structural design of the first valve body and the second valve body can facilitate the disassembly and assembly of the starter 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.

[0019] The valve needle can perform precise telescopic movement, and radial displacement is avoided in its radial direction by a corresponding limit structure. Therefore, the valve has good movement flexibility and good sealing effect when opening and closing. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 The structure of the utility model is shown in FIG. Figure 1 .

[0021] Figure 2 The structure of the utility model is shown in FIG. Figure 2 .

[0022] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0023] Figure 4 It is a structural schematic diagram of the first valve body in the utility model.

[0024] Figure 5 It is a structural schematic diagram of the valve needle in the utility model.

[0025] In the figure: 1. first valve body; 2. second valve body; 3. valve needle; 4. air pipe joint; 5. mounting hole; 6. hexagonal screw; 7. plug; 8. guide boss; 9. vent cavity; 10. spacer; 11. spring cavity; 12. spring; 13. adjusting nut; 14. sealing gasket; 15. positioning column. DETAILED DESCRIPTION

[0026] The technical solution of the utility model is further described below 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 the present application.

[0027] The cylinder starting valve provided by the utility model is mainly installed on the cylinder of an engine and used for introducing compressed air into the cylinder.

[0028] refer to Figure 1-5 As shown, the cylinder start valve described in this embodiment mainly includes a first valve body 1 and a second valve body 2. The second valve body 2 is installed on the rear end surface of the first valve body 1, and the two are connected by a hexagonal screw 6. The upper halves of the first valve body 1 and the second valve body 2 are both cylindrical structures, and the lower surfaces are flat structures to facilitate the installation of the start valve. At the same time, in this embodiment, two through mounting holes 5 are circumferentially arranged on the end surfaces of the first valve body 1 and the second valve body 2, respectively, for mounting the start valve on the cylinder body.

[0029] The end of the first valve body 1 is provided with a positioning column 15, which is a cylindrical structure as a whole and is integrally formed with the first valve body 1. The positioning column 15 is mainly used for the installation and positioning of the starter valve. When assembled, it is installed in the cylinder to ensure the installation accuracy of the starter valve. A ventilation cavity 9 is provided in the first valve body 1 to penetrate the interior of the positioning column 15, and an air pipe joint 4 is provided outside the first valve body 1. The interior of the air pipe joint 4 is connected to the ventilation cavity 9, and the exterior is connected to the air distribution valve through a pipeline, so that compressed air can enter the ventilation cavity 9. A slidable valve needle 3 is provided in the ventilation cavity 9, and the end of the valve needle 3 is provided with a plug 7. The plug 7 is located outside the positioning column 15, and the air outlet at the end of the positioning column 15 can be closed by the plug 7. When the valve needle 3 moves outward, the plug 7 opens the air outlet at the end of the positioning column 15, so that compressed air can enter the cylinder. When the valve needle 3 moves inward, the plug 7 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.

[0030] Inside the first valve body 1 , a spring chamber 11 is provided on one side of the vent chamber 9 . The vent chamber 9 and the spring chamber 11 are separated by a partition 10 . However, the partition 10 has a corresponding through hole to allow the other end of the valve needle 3 to enter the spring chamber 11 .

[0031] A spring 12 is arranged in the spring chamber 11. The spring 12 is sleeved on the outside of the valve needle 3, one end of the spring contacts the end surface of the partition 10, and the other end contacts the adjusting nut 13, which is installed on the valve needle 3 through threads. Through the above structure, the spring 12 can exert force on the valve needle 3, so that the valve needle 3 has an inward pre-tightening force, so that the plug 7 closes the end of the positioning column 15. When high-pressure air passes through, the pressure in the ventilation chamber 9 increases, pushing the plug 7 to move outward, and when the elastic force of the spring 12 is overcome, the plug 7 will be opened.

[0032] Therefore, in the above structural design of this embodiment, the starter valve can only be opened when the compressed air pressure reaches the set pressure. In this embodiment, by changing the position of the adjusting nut 13 on the valve needle 3, the preload force of the spring 12 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 13, the valve can only be opened when the pressure in the ventilation cavity 9 is greater than 0.8MPA.

[0033] In this embodiment, the second valve body 2 is connected to the first valve body 1 by a hexagonal screw 6. After the second valve body 2 is removed, the adjusting nut 13 can be easily adjusted. At the same time, in order to ensure the sealing, a sealing gasket 14 is arranged between the first valve body 1 and the second valve body 2.

[0034] The valve needle 3 moves in the ventilation cavity 8. In order to ensure the flexibility and stability of the movement of the valve needle 3, a guide boss 8 is provided on the valve needle 3. The guide boss 8 has a plurality of ventilation grooves evenly distributed around the circumference. The outer ring of the guide boss 8 is slidably fitted with the ventilation cavity 9. The ventilation grooves can allow the gas in the ventilation cavity 9 to enter the position of the plug 7. The setting of the guide boss 8 ensures the flexibility and stability of the movement of the valve needle 3.

[0035] In this embodiment, in order to ensure the sealing effect between the plug 7 and the positioning column 15, the surfaces of the plug 7 and the positioning column 15 that cooperate with each other are designed to be 45° conical surfaces, thereby ensuring the sealing performance of the starting valve.

[0036] Contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0037] 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 cylinder start valve, characterized in that: The invention comprises a first valve body and a second valve body; a positioning column is arranged at the end of the first valve body, a ventilation cavity which passes through the interior of the positioning column is arranged in the first valve body, a slidable valve needle is arranged in the ventilation cavity, a plug at the end of the valve needle is located outside the positioning column, a spring cavity is arranged at one side of the ventilation cavity in the first valve body, a spring is arranged in the spring cavity, the spring sleeve is arranged on the valve needle for applying force to the valve needle, an air pipe joint is arranged outside the first valve body, the air pipe joint is communicated with the ventilation cavity, the second valve body is installed at the end of the first valve body for closing the spring cavity, and a plurality of through mounting holes are arranged circumferentially on the end faces of the first valve body and the second valve body.

2. The cylinder start valve according to claim 1, 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.

3. The cylinder start valve according to claim 2, characterized in that: The valve needle is provided with a thread on one side of the spring cavity, an adjusting nut is installed at the thread, one end of the spring is pressed tightly against the partition, and the other end is pressed tightly against the adjusting nut.

4. The cylinder start valve according to claim 3, characterized in that: A cavity capable of accommodating the adjusting nut is disposed at one end of the second valve body close to the first valve body.

5. The cylinder start valve according to claim 1, 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.

6. The cylinder start valve according to claim 1, characterized in that: The first valve body and the second valve body are connected via screws.

7. The cylinder start valve according to claim 1, 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.

8. The cylinder start valve according to claim 1, characterized in that: A sealing gasket is provided at the connection between the first valve body and the second valve body.

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