Air compressor modified from diesel engine

Abstract

The utility model discloses an air compressor refitted from a diesel engine, which is refitted from a four-cylinder diesel engine and comprises an air cylinder body of an original diesel engine and a cylinder cover used for sealing the air cylinder body, a pair of air inlets and air outlets are arranged on the cylinder cover corresponding to each air cylinder, each air inlet is provided with an air inlet valve assembly, and each air outlet is provided with an air outlet valve assembly. Each exhaust port is provided with an exhaust valve assembly, the camshaft is driven by the crankshaft to control opening and closing of the four inlet valve assemblies, and the four inlet valve assemblies can be opened in sequence according to the ignition sequence of an original diesel engine, so that air enters the four air cylinders in sequence according to the ignition sequence of the original diesel engine. The four exhaust valve assemblies are matched with gas in the cylinder body to control opening and closing of the exhaust valve assemblies. According to the utility model, the pressure accuracy of compressed air is improved, the improvement cost is reduced, the operation stability is improved, the vibration and noise are reduced, the gas yield is improved, and the air compressor is suitable for modifying a diesel engine into an air compressor.

Description

Technical Field

[0001] This utility model relates to an air compressor, specifically an air compressor modified from a diesel engine. Background Technology

[0002] Existing air compressors are expensive and their parts are prone to damage. Therefore, retrofitting air compressors using a relatively mature diesel engine shows promising prospects and is highly economical. Chinese utility model patent CN221373822U discloses an automatic exhaust air compressor modified from a diesel engine. This air compressor, converted from a diesel engine, reduces manufacturing costs and improves quality. However, this air compressor has the following drawbacks:

[0003] (1) When in use, the first and fourth cylinders of the air compressor are in a group and simultaneously intake air, while the second and third cylinders are in a group and simultaneously intake air. Correspondingly, the first and fourth cylinders of the air compressor are in a group and simultaneously exhaust air, while the second and third cylinders are in a group and simultaneously exhaust air. This makes the air compressor run poorly and easily generates large vibrations and noise when the air compressor is running.

[0004] (2) The air compressor is equipped with a gasket, and there is an air inlet between the air inlet of the cylinder head and the cylinder body. When in use, the space of the air inlet in the gasket contains a portion of the gas that enters from the air inlet. This reduces the amount of gas entering the cylinder body, which in turn reduces the amount of gas discharged by the air compressor. This will seriously affect the air output of the air compressor. Summary of the Invention

[0005] To address the aforementioned shortcomings in the existing technology, this utility model aims to provide an air compressor modified from a diesel engine, thereby improving the smoothness of air compressor operation, reducing vibration and noise, and increasing the air output of the air compressor.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An air compressor modified from a diesel engine, which is modified from a four-cylinder diesel engine, includes the original diesel engine cylinder block and a cylinder head for sealing the cylinder block. The cylinder head is provided with a pair of intake ports and exhaust ports corresponding to the position of each cylinder. Each intake port is provided with an intake valve assembly, and each exhaust port is provided with an exhaust valve assembly. The camshaft controls the opening and closing of the four intake valve assemblies under the drive of the crankshaft, and the four intake valve assemblies can open sequentially according to the original diesel engine ignition sequence, so that the four cylinders can enter air sequentially according to the original diesel engine ignition sequence. The four exhaust valve assemblies control the opening and closing of the exhaust valve assembly by cooperating with the gas in the cylinder block.

[0007] As a limitation of this utility model, four sets of cam cams for controlling the opening and closing of four intake valve assemblies are respectively fixed on the camshaft. Each set of cam cams includes a first cam cam unit and a second cam cam unit. The first cam cam unit and the second cam cam unit are symmetrically arranged about the camshaft axis by rotating 180 degrees. The first cam cams on the camshaft corresponding to the first cylinder, the second cylinder, the fourth cylinder, and the third cylinder are spaced 45 degrees apart. The cranks on the crankshaft corresponding to the first cylinder, the second cylinder, the fourth cylinder, and the third cylinder are spaced 90 degrees apart.

[0008] As another limitation of this utility model, a number of limiting members are fixed on the cylinder head at the position around the exhaust port to prevent the exhaust valve port in the exhaust valve assembly from falling into the cylinder body, and the bottom surface of the limiting members is flush with the bottom surface of the cylinder head.

[0009] As a further limitation of this utility model, the limiting component is a flat-head screw.

[0010] As a further definition of this utility model, the exhaust valve assembly includes an exhaust valve fixed on the exhaust port, an exhaust valve shaft slidably disposed on the cylinder head and separated from the exhaust valve, an exhaust valve fixed on the exhaust valve shaft for cooperating with the exhaust valve to seal the cylinder body, and an elastic pressure component for keeping the exhaust valve in a normally closed state and for being able to push the exhaust valve upward by gas pressure. The elastic pressure component drives the exhaust valve to move towards the cylinder body to close the exhaust port.

[0011] As a further limitation of this utility model, a bracket is fixedly provided on the cylinder head, and the exhaust valve shaft is slidably disposed on the bracket; the elastic pressure component includes a limiting block fixedly disposed on the exhaust valve shaft and a spring sleeved on the exhaust valve shaft, one end of the spring abutting against the bracket and the other end abutting against the limiting block, the spring being in a compressed state, causing the exhaust valve shaft to generate a force that moves closer to the cylinder body, and causing the exhaust valve to abut against the exhaust valve opening.

[0012] As a third limitation of this utility model, it also includes an intake decompression device for keeping the intake valve assembly normally open in its initial state.

[0013] As a further limitation of this utility model, the intake decompression device includes a rotating shaft, a stop rod, and an electromagnet. The rotating shaft is rotatably mounted on a bracket, the stop rod is fixed on the rotating shaft and its other end extends above the electromagnet, the electromagnet is fixed on the machine body, and an eccentric wheel is fixed on the rotating shaft, the eccentric wheel abutting against the intake valve assembly.

[0014] By adopting the above-mentioned technical solution, the beneficial effects achieved by this utility model compared with the prior art are as follows:

[0015] (1) This utility model utilizes a diesel engine to modify an air compressor. Diesel engine technology is relatively mature, with low purchase costs. All components operate smoothly and are easy to maintain and replace, which can reduce the manufacturing cost of the air compressor. Furthermore, by changing the structure and position of the cam cam on the camshaft and the angle of the crank on the crankshaft, this utility model enables the four cylinders to intake air in the same order as the original diesel engine's ignition sequence, and the corresponding four cylinders to exhaust air in the same order. This can effectively improve the smoothness of the air compressor's operation, reduce vibration and noise, and save the input energy of driving the camshaft compared to a modified air compressor where two cylinders operate simultaneously.

[0016] (2) The present invention is provided with several limiting components. The several limiting components can limit the exhaust port and thus prevent the exhaust port from falling into the cylinder body, which can improve the reliability of the structure of the present invention. In addition, the present invention eliminates the gasket in the prior art, avoiding the space between the cylinder head intake port and the cylinder body that can accommodate gas. When using the present invention, the gas entering from the intake port can all enter the cylinder body. Compared with the prior art, the amount of gas entering the cylinder body increases, which in turn increases the amount of gas discharged by the present invention, which can effectively improve the gas production of the present invention.

[0017] (3) The limiting component in this utility model is a flat-head screw. The flat-head screw is a standard component, which is easy to obtain and has low purchase cost, and can effectively reduce the manufacturing cost.

[0018] (4) This utility model utilizes the pressure of compressed gas to open the exhaust valve upwards. Only when the pressure of compressed air reaches a certain value can the exhaust valve be opened to allow gas to be discharged, thus improving the accuracy of compressed gas pressure. Furthermore, this utility model changes the original diesel engine's exhaust port from being driven downwards by a camshaft to being opened upwards by gas pressure, achieving minimal modification, reducing conversion costs, eliminating a camshaft that drives the exhaust valve's opening and closing, and reducing operating energy consumption.

[0019] (5) The present invention provides a gas pressure reducing device on the intake pipe. During initial operation, the eccentric wheel presses on the intake valve assembly for a specified time, so that the intake valve assembly is in the normally open state for a specified time. The movement of the piston rod in the cylinder does not generate compressed air, which is conducive to the motor starting quickly under no-load in a short time and improving the starting efficiency.

[0020] In summary, this invention improves the pressure accuracy of compressed air, reduces modification costs, enhances operational stability, reduces vibration and noise, and increases air production, making it suitable for converting diesel engines into air compressors. Attached Figure Description

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] Figure 1 This is a three-dimensional structural diagram of an embodiment of the present utility model;

[0023] Figure 2 This is a cross-sectional structural diagram of the connection between the cylinder block and the intake valve assembly and the exhaust valve assembly in an embodiment of the present utility model;

[0024] Figure 3 This is a schematic diagram of the cam protrusion on the camshaft in an embodiment of the present invention;

[0025] Figure 4 for Figure 2 An enlarged schematic diagram of part A in the middle;

[0026] Figure 5 This is a schematic diagram showing the placement of the three flat-head screws in an embodiment of this utility model;

[0027] In the diagram: 1. Cylinder block; 2. Cylinder head; 21. Intake port; 22. Exhaust port; 3. Intake valve assembly; 4. Camshaft; 5. Cam lobe; 51. First cam lobe unit; 52. Second cam lobe unit; 6. Exhaust valve shaft; 7. Exhaust valve; 8. Exhaust valve opening; 9. Flathead bolt; 10. Bracket; 11. Spring; 12. Limiting block; 13. Rotary shaft; 14. Push rod; 15. Electromagnet; 16. Eccentric wheel; 17. Intake pipe; 18. Exhaust pipe. Detailed Implementation

[0028] The preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are for illustrative purposes only and are not intended to limit the scope of the present invention.

[0029] Example 1: An air compressor converted from a diesel engine

[0030] like Figure 1 , Figure 2 As shown, this embodiment is modified from a four-cylinder diesel engine. The working principle and specific structure of the diesel engine are existing technologies and will not be described in detail. Since there is also a process of compressing air in a diesel engine, the air compression can be completed by utilizing the two strokes of intake and compression. Therefore, air compression can be achieved by modifying the diesel engine. It should be noted in advance that this embodiment is a further improvement on the existing technology in Chinese utility model patent document CN221373822U, entitled "An Automatic Exhaust Air Compressor Modified from a Diesel Engine". Therefore, this article only provides a brief overview of the structure that is the same as that in the existing technology. Unless otherwise specified, it should be understood that the structure is the same as that in the above-mentioned existing technology.

[0031] This embodiment modifies an existing diesel engine, including the original diesel engine's cylinder block 1 and a cylinder head 2 for sealing the cylinder block 1. The cylinder head 2 has a pair of intake ports 21 and exhaust ports 22 corresponding to the position of each cylinder. Each intake port 21 is equipped with an intake valve assembly 3 and each intake port 21 is sealed by the intake valve assembly 3. Each exhaust port 22 is equipped with an exhaust valve assembly and each exhaust port 22 is sealed by the exhaust valve assembly. The camshaft 4 controls the opening and closing of the four intake valve assemblies 3 under the drive of the crankshaft. The four intake valve assemblies 3 can open sequentially according to the original diesel engine's ignition sequence, so that the four cylinders can enter air sequentially according to the original diesel engine's ignition sequence. The four exhaust valve assemblies control the opening and closing of the exhaust valve assembly by cooperating with the gas in the cylinder block 1.

[0032] In this embodiment, the cylinder head 2 adopts existing diesel engine technology. The cylinder head 2 has internal cavities corresponding to the air intake ports 21 and exhaust ports 22, respectively. The cavity corresponding to the air intake port 21 is connected to the intake pipe 17, and the cavity corresponding to the exhaust port 22 is connected to the exhaust pipe 18. Specifically, each cavity on the cylinder head 2 corresponding to one of the four air intake ports 21 has a pipe, and these four pipes are then connected to the intake pipe 17. Similarly, each cavity on the cylinder head 2 corresponding to one of the four exhaust ports 22 has a pipe, and these four pipes are then connected to the exhaust pipe 18. The gas discharged from the exhaust pipe 18 is compressed gas and is connected to a collection bag.

[0033] The original diesel engine had a crankshaft gear to camshaft gear ratio of 2:1, so for every 90 degrees the crankshaft rotated, the camshaft rotated 45 degrees. After modification, the size of the crankshaft gear and camshaft gear remains the same, and the gear ratio is still 2:1. The only change is the structure and position of the cam camshaft camshaft in the original diesel engine. Specifically, for example… Figure 3As shown, in this embodiment, four sets of cam lobes 5 for controlling the opening and closing of four intake valve assemblies 3 are fixed on the camshaft 4. Each set of cam lobes 5 includes a first cam lobe unit 51 and a second cam lobe unit 52. The first cam lobe unit 51 and the second cam lobe are both consistent with the shape of the cam lobes of the original diesel engine, and the first cam lobe unit 51 and the second cam lobe unit 52 are symmetrically arranged about the axis of the camshaft 4 by rotating 180 degrees. The first cam lobes on the camshaft 4 corresponding to the first cylinder, second cylinder, fourth cylinder, and third cylinder are spaced 45 degrees apart. After modification, when the camshaft 4 rotates 180 degrees, the intake valve assemblies 3 corresponding to the first cylinder, second cylinder, fourth cylinder, and third cylinder open once in sequence, and the first cylinder, second cylinder, fourth cylinder, and third cylinder intake once in sequence. Furthermore, in order to cooperate with the camshaft and achieve the sequential intake and exhaust effect of the first, second, fourth, and third cylinders in this embodiment, the crankshaft crank angle in the original diesel engine was modified accordingly. Specifically, the cranks on the crankshaft corresponding to the first, second, fourth, and third cylinders are spaced 90 degrees apart, while the crank structure remains unchanged from the original diesel engine. It should be noted that... Figure 3 The four sets of cam protrusions 5, from left to right, are the cam protrusions 5 corresponding to the first cylinder, the second cylinder, the fourth cylinder, and the third cylinder.

[0034] In this embodiment, to achieve the effect of an air compressor, the original diesel engine's exhaust valve assembly, driven downwards by the camshaft 4, is changed to open upwards by the pressure of compressed gas. The difference is that, to accommodate the upward opening method of the exhaust valve assembly in this embodiment, the existing method of using gaskets is not adopted. Instead, a structure with an exhaust valve 8 and several limiting components is used. Specifically, the exhaust valve assembly includes an exhaust valve 8 fixed to the exhaust port 22, an exhaust valve shaft 6 slidably mounted on the cylinder head 2 and separate from the exhaust valve 8, an exhaust valve 7 fixed to the exhaust valve shaft 6 for cooperating with the exhaust valve 8 to seal the cylinder block 1, and an elastic pressure component for keeping the exhaust valve 7 in a normally closed state and for being able to push the exhaust valve 7 upwards by gas pressure. The elastic pressure component drives the exhaust valve 7 to move towards the cylinder block 1 to close the exhaust port 22. A bracket 10 is fixedly mounted on the cylinder head 2, and the exhaust valve shaft 6 is slidably mounted on the bracket 10. The elastic pressure assembly includes a limiting block 12 fixed on the exhaust valve shaft 6 and a spring 11 sleeved on the exhaust valve shaft 6. One end of the spring 11 abuts against the bracket 10, and the other end abuts against the limiting block 12. The spring 11 is in a compressed state, causing the exhaust valve shaft 6 to generate a force that moves towards the cylinder block 1, and causing the exhaust valve 7 to abut against the exhaust valve opening 8. Figure 4 , Figure 5As shown, several limiting components are fixed on the cylinder head 2 at the position around the exhaust port 22 to prevent the exhaust valve door 8 in the exhaust valve assembly from falling into the cylinder block 1. The bottom surface of the limiting components is flush with the bottom surface of the cylinder head 2, and the limiting components are flat-head screws 9. In this embodiment, a total of three flat-head screws 9 are provided and are evenly spaced along the direction around the exhaust port 22. Part of the head of the three flat-head screws 9 presses against the exhaust valve door 8 and part of the head presses against the cylinder head 2, and the bottom surface of the three flat-head screws 9 is flush with the bottom surface of the cylinder head 2.

[0035] This embodiment also includes an intake decompression device for keeping the intake valve assembly 3 in a normally open state in the initial state. Specifically, the intake decompression device includes a rotating shaft 13, a stop rod 14 and an electromagnet 15. The rotating shaft 13 is rotatably mounted on the bracket 10. The stop rod 14 is fixed on the rotating shaft 13 and its other end extends above the electromagnet 15. The electromagnet 15 is fixed on the engine body. An eccentric wheel 16 is fixed on the rotating shaft 13 and abuts against the intake valve assembly 3.

[0036] The principle of compressed air in this embodiment is basically the same as that of compressed air from diesel engines converted into air compressors in the prior art. The difference is the working sequence of the compressed cylinders. In this embodiment, when the camshaft 4 that controls the opening and closing of the intake valve assembly 3 is running normally, the intake valve assembly 3 corresponding to the first cylinder, the second cylinder, the fourth cylinder, and the third cylinder opens and closes in sequence. The corresponding first cylinder, the second cylinder, the fourth cylinder, and the third cylinder complete the intake and exhaust in sequence, and repeat the cycle to achieve continuous gas compression.

[0037] It should be noted that the above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A kind of air compressor by diesel engine modification, by four cylinder diesel engine modification, including the cylinder block of original diesel engine and the cylinder head for sealing cylinder block, the position corresponding each cylinder of cylinder head is equipped with a pair of air inlet and exhaust port, each air inlet is equipped with air inlet valve assembly, each exhaust port is equipped with exhaust valve assembly, it is characterized by: The cam shaft is driven by the crankshaft to control the opening and closing of the four intake valve assemblies, and the four intake valve assemblies can be opened in turn according to the original diesel engine ignition sequence, so that the four cylinders can be sequentially inhaled according to the original diesel engine ignition sequence. The four exhaust valve assemblies control the opening and closing of the exhaust valve assemblies by cooperating with the gas in the cylinder block.

2. A converted air compressor from a diesel engine as claimed in claim 1, wherein: Four groups of cam protrusions for controlling the opening and closing of the four intake valve assemblies are respectively fixed on the cam shaft, each group of cam protrusions includes a first cam protrusion unit and a second cam protrusion unit, and the first cam protrusion unit and the second cam protrusion unit are arranged symmetrically about the cam shaft axis by 180 degrees; the first cam protrusions on the cam shaft corresponding to the first cylinder, the second cylinder, the fourth cylinder and the third cylinder are spaced apart by 45 degrees in turn; the cranks on the crankshaft corresponding to the first cylinder, the second cylinder, the fourth cylinder and the third cylinder are spaced apart by 90 degrees in turn.

3. A converted air compressor from a diesel engine according to claim 1 or 2, characterized in that: A plurality of limiting members for preventing the exhaust port in the exhaust valve assembly from falling into the cylinder block are fixed on the cylinder head at the position of the exhaust port ring.

4. A compressor converted from a diesel engine according to claim 3, characterized in that: The limiting member adopts a flat head screw.

5. A converted air compressor from a diesel engine as claimed in claim 4, wherein: The exhaust valve assembly includes an exhaust port fixed on the exhaust port, an exhaust valve shaft slidingly arranged on the cylinder head and separated from the exhaust port, an exhaust valve fixed on the exhaust valve shaft for cooperating with the exhaust port to seal the cylinder block, and an elastic pressure assembly for keeping the exhaust valve in a normally closed state and capable of lifting the exhaust valve upward by gas pressure. The elastic pressure assembly drives the exhaust valve to move towards the cylinder block to close the exhaust port.

6. A converted air compressor from a diesel engine as claimed in claim 5, wherein: A bracket is fixed on the cylinder head, and the exhaust valve shaft is slidingly arranged on the bracket; the elastic pressure assembly includes a limiting block fixed on the exhaust valve shaft and a spring sleeved on the exhaust valve shaft, one end of the spring abuts against the bracket, and the other end abuts against the limiting block, the spring is in a compressed state, the exhaust valve shaft generates a force to approach the cylinder block, and the exhaust valve abuts against the exhaust port.

7. A converted air compressor from a diesel engine according to any one of claims 1, 2, 4, 5, 6, characterized in that: It also includes an intake pressure reducing device for keeping the intake valve assembly in an open state in the initial state.

8. A converted air compressor from a diesel engine as claimed in claim 7, wherein: The intake pressure reducing device includes a rotating shaft, a stopper and an electromagnet, the rotating shaft is rotatably arranged on the bracket, the stopper is fixed on the rotating shaft and extends to above the electromagnet, the electromagnet is fixed on the machine body, an eccentric wheel is fixed on the rotating shaft, and the eccentric wheel abuts against the intake valve assembly.

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