Diesel pressure control device

Abstract

The utility model discloses a diesel pressure control device which comprises a first side cover, a second side cover, a moving diaphragm, a guide column and a diesel pressure control valve. The first side of the movable diaphragm and the first side cover form a closed cavity, and an air inlet hole is formed in the cavity, connected with an air source and used for introducing air pressure; the second side of the moving diaphragm is connected with a guide column, and the guide column penetrates through the second side cover and is connected with a valve rod of the diesel pressure control valve. And under the action of the air source, the valve rod is driven by the guide column to adjust the opening degree until the movable diaphragm moves, so that the output pressure of the diesel pressure control valve is accurately controlled. Automatic control over the diesel pressure is achieved through pneumatic adjustment, and the device has the advantages of being compact in structure, efficient in operation, stable in running and accurate in control and is suitable for diesel engine testing and pressure adjustment scenes of related equipment.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel pressure regulation, and in particular to a precise diesel pressure automatic regulation device based on pneumatic control. Background Art

[0002] Diesel engines are widely used in modern industry and transportation, and their performance directly impacts equipment efficiency and reliability. Precise fuel pressure control is crucial during diesel engine testing and commissioning. Existing diesel pressure regulators primarily utilize electromagnetic control structures, which have numerous practical limitations and struggle to meet the demands for high precision and efficiency.

[0003] Application status of similar technologies

[0004] The precision diesel pressure automatic regulating devices currently on the market are mainly based on electromagnetic regulation. These devices have made some progress in pressure control, but there are still the following problems:

[0005] 1. The pressure control capability is limited. Existing devices cannot achieve automatic and precise control of high and low pressures at the same time, and cannot meet the diverse demands for diesel pressure under different working conditions.

[0006] 2. Relying on manual control, most regulating devices use manual regulating valves, which require manual operation when switching between high and low pressures. The operation is complicated and inconvenient, and it is difficult to ensure the accuracy and consistency of the adjustment.

[0007] 3. Low precision. Manual adjustment performs poorly in high-precision pressure control, making it difficult to achieve consistent pressure output, affecting the final test results and product quality.

[0008] Defect analysis of similar technologies

[0009] 1. The operation is inconvenient. The manual adjustment method requires frequent replacement of the adjustment device when switching between high and low voltage. The operation steps are cumbersome, which increases the difficulty of operation and the possibility of error.

[0010] 2. Accuracy is difficult to guarantee. Manual adjustment cannot achieve high-precision pressure control, especially in application scenarios that require precise control. It is difficult to ensure the consistency and stability of pressure.

[0011] 3. The test results are unstable. Due to the inaccurate pressure control, manual adjustment may cause fluctuations in test data, affecting the performance evaluation and quality control of the product.

[0012] In summary, the existing precision diesel pressure automatic regulating device has obvious technical deficiencies, especially in terms of automatic and precise control of high and low pressures, ease of operation, and adjustment accuracy. A new type of regulating device is needed to improve the pressure control capability during diesel engine testing and production, and ensure the stable operation of the equipment and product quality. Summary of the Invention

[0013] The present invention aims to provide a diesel pressure control device that, through pneumatic adjustment technology, achieves real-time, precise, and automated control of diesel pressure, solving the problems of limited pressure control capability, inconvenient operation, and insufficient adjustment accuracy in the prior art. This device can thereby improve the pressure control capability during diesel engine testing and commissioning, as well as during the production of diesel-powered equipment, and ensure stable operation of the equipment and product quality.

[0014] The diesel pressure control device of the present invention includes a first side cover and a second side cover; a movable diaphragm, a first side of which forms a closed cavity with the first side cover, and the closed cavity includes an air inlet hole; the second side surface of the movable diaphragm is connected to a guide column, and the guide column extends out of the second side cover; the guide column is connected to the valve stem of the diesel pressure control valve; the air inlet hole is connected to the air source, and the movable diaphragm moves the guide column as the air pressure acts, thereby moving the valve stem opening to control the output pressure of the diesel pressure control valve.

[0015] Furthermore, the movable diaphragm is connected to a first gasket and a second gasket, the first gasket being arranged on a first side of the movable diaphragm, the second gasket being arranged on a second side of the movable diaphragm, the guide post being connected to the second gasket, and the second side cover being provided with a hole for the guide post to pass through, with a first guide sleeve being provided around the hole.

[0016] The present invention also includes a connecting post for connecting the second side cover to the diesel pressure control valve. The connecting post includes a side opening for exposing the valve stem. A stem length adjustment nut is provided at the top of the valve stem, one end of which is engaged with the guide post. The opening exposes the stem length adjustment nut, facilitating fine-tuning of the valve stem length, ensuring a close fit with the guide post and improving adjustment accuracy.

[0017] The diesel pressure control valve includes a valve seat, an oil inlet hole disposed therein, and an oil outlet hole communicating with the oil inlet. A sealing gasket is provided at the junction of the oil inlet and the oil outlet hole, and the sealing gasket includes an oil hole. The front end of the valve stem is provided with a tapered front end for sealing the oil hole. The valve stem is disposed within a mounting hole in the valve seat and is provided with a second guide sleeve for guiding the valve stem, the second guide sleeve enclosing the valve stem. The second guide sleeve defines a connecting hole communicating with the oil outlet hole at the junction of the sealing gasket and the valve stem. An oil seal assembly is located above the second guide sleeve, which is used to axially seal the valve stem. A stopper device connected to the inner wall of the mounting hole is located above the oil seal assembly.

[0018] With this structural design, the pneumatic diaphragm, under the influence of air source pressure, drives the valve stem via the guide post, achieving automatic opening adjustment of the diesel pressure control valve, thereby precisely controlling diesel pressure output. The first and second guide sleeves ensure a stable motion path for the guide post and valve stem, preventing deviation and friction, and improving regulation accuracy and response speed. The gasket and oil seal assembly effectively prevent diesel leakage, ensuring stable and consistent pressure control. The adjustment nut allows for fine-tuning of the valve stem length, further enhancing pressure regulation accuracy.

[0019] The diesel pressure control device of the present invention has the following advantages:

[0020] 1. Real-time and precise pressure regulation, the rapid response of the pneumatic diaphragm and the precise movement of the guide column and valve stem realize automatic regulation of diesel pressure, ensuring the stability and consistency of pressure output.

[0021] 2. Easy to operate, automated pneumatic control reduces manual intervention, avoids errors and operational complexity that may occur during manual adjustment, and improves operational efficiency and reliability.

[0022] 3. Simple structure, easy maintenance, reasonable design of each component. The device has a simple structure, is easy to install and maintain, and reduces production and maintenance costs.

[0023] 4. High-efficiency sealing performance, the application of gaskets and oil seal components effectively prevents diesel leakage and ensures the safety and reliability of the device under high-pressure conditions.

[0024] 5. It has a wide range of applications and is suitable for the testing and debugging of diesel engines and the automatic pressure regulation in the production process of diesel power equipment. It can meet the pressure control requirements under different working conditions and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the diesel pressure control device of the present invention.

[0026] Figure 2 It is a schematic cross-sectional structural diagram of the diesel pressure control device of the present invention.

[0027] Figure 3 It is a schematic diagram of the exploded structure of the upper part of the diesel pressure control device of the present invention.

[0028] Figure 4 This is a schematic diagram of the overall structure of the diesel pressure control device of the present invention from another perspective.

[0029] Figure 5 It is a schematic diagram of the exploded structure of the diesel pressure control valve of the present invention. DETAILED DESCRIPTION

[0030] The specific implementation of the diesel pressure control device of the present invention will be described in detail below with reference to the accompanying drawings.

[0031] The present invention provides a diesel pressure control device which realizes real-time, precise and automatic control of diesel pressure through pneumatic adjustment technology.

[0032] Reference Figure 1 and Figure 2 As shown, it includes a first side cover 100 and a second side cover 101, which are connected together by a connecting structure to form a cavity. The first and second side covers 100 and 101 are both disc-shaped structures with slightly protruding edges to facilitate sealing connections with other components. Multiple screw holes 103 are evenly distributed along the edge of the cover plate, which are used to bolt the two side covers together to form a sealed cavity. An air inlet 106 is located in the center of the first side cover 100 to facilitate gas flow.

[0033] Reference Figures 2 to 4 As shown, the movable diaphragm 200 is installed between the first side cover 100 and the second side cover 101. It and the first side cover 100 form a sealed cavity 201. This sealed cavity 201 is equipped with an air inlet 106 for connecting to an air source. The air source applies air pressure to the movable diaphragm 200 through the air inlet 106. This air pressure acts on the first side of the movable diaphragm 200, causing it to deform. The second side of the movable diaphragm 200 is connected to a guide post 107.

[0034] A first gasket 108 and a second gasket 109 are connected to the movable diaphragm 200. The first gasket 108 is positioned on the first side of the movable diaphragm 200, while the second gasket 109 is positioned on the second side of the movable diaphragm 200. A guide post 107 is connected to the second gasket 109 to ensure stable and accurate pressure transmission. A guide post hole 111 is provided in the second side cover 101. A first guide sleeve 110 is positioned around the hole to guide the movement of the guide post 107 and prevent it from deflecting.

[0035] Furthermore, the movable diaphragm 200 is made of rubber and deforms under air pressure, thereby generating stable and fluctuating up and down pressure.

[0036] Reference Figure 2 、 Figure 3 and Figure 4 The guide post 107 passes through the second side cover 101 and extends to the valve stem 305 of the diesel pressure control valve 113. The change in air pressure is transmitted to the guide post 107 through the movable diaphragm 200, thereby driving the opening of the valve stem 305 to adjust the output pressure of the diesel pressure control valve 113.

[0037] Furthermore, the guide post 107 is a columnar structure. The top of the guide post 107 is used to connect with the movable diaphragm 200 and the gaskets 108 and 109. The contact surface of the guide post 107 is divided into a hemispherical top. Through the guide post hole 111, the periphery of the guide post 107 and the first guide sleeve 110 are tightly matched to ensure that the guide post 107 is stable and without deviation during the movement. The bottom of the guide post 107 is connected to the valve stem 305 of the diesel pressure control valve 113, which facilitates the installation and adjustment of the valve stem 305, thereby accurately transmitting the air pressure driving force. The surface of the entire guide post 107 has been precisely machined and has good sliding properties, which can effectively reduce friction and wear, while ensuring stability in high-frequency movement. The overall design of the guide post 107 is intended to withstand the force transmitted from the movable diaphragm 200 and accurately transmit it to the valve stem 305, thereby achieving precise regulation and stable control of the diesel pressure.

[0038] Reference Figure 2 、 Figure 4 and Figure 5 The diesel pressure control valve 113 includes a valve seat 114, which is provided with an oil inlet hole 115 and an oil outlet hole 116 connected to the oil inlet hole 115. A sealing gasket 117 is provided at the junction of the oil inlet hole 115 and the oil outlet hole 116. The sealing gasket 117 includes an oil hole 118. The front end of the valve stem 305 is provided with a tapered front end 306 for sealing the oil hole to prevent diesel leakage. The valve stem 305 is set in the mounting hole 130 of the valve seat 114 and is guided by the second guide sleeve 500. The second guide sleeve 500 surrounds the valve stem 305 to ensure its stable movement. A connecting hole is provided at the connection between the sealing gasket 117 and the valve stem 305, which is used to connect to the oil outlet hole 116 to ensure the stability of diesel flow.

[0039] Oil inlet 115, located at the center of valve seat 114, features a circular, through-hole structure, guiding diesel fuel smoothly into the valve body. Its upper portion features a tapered transition area, effectively reducing fluid resistance when connected to the oil circuit, ensuring smooth diesel flow. It also facilitates mating with the oil hole in gasket 117, enhancing sealing performance. The wall of oil inlet 115 is uniform in thickness and precision-machined to ensure a smooth, burr-free surface. It can withstand high-pressure liquid pressure without deformation or leakage.

[0040] The lower portion of the valve stem 305 cooperates with the sealing gasket 117 and the tapered front end 306 of the valve stem 305. When the valve stem 305 is pressed downward, the tapered front end 306 can completely close the oil inlet hole 115, thereby achieving precise pressure control of the diesel fluid.

[0041] The connecting column 400 is used to connect the second side cover 101 and the valve seat 114 of the diesel pressure control valve 113; the connecting column 400 includes a side opening 401 for exposing the valve stem 305. The connecting column 400 is an overall U-shaped frame structure, with a flat base 126 at the top. A circular hole 402 is provided in the center of the base 126 for installing the guide column 107, and a plurality of small circular holes are evenly distributed around it for bolt fixing. A hollow U-shaped frame is connected to the bottom of the base 126, and symmetrical support columns 802 are provided on both sides of the frame, which are integrally formed with the base 126. The bottom of the support column 802 is connected to the edge of the frame to form an open structure at the bottom. The opening width and height are precisely designed to meet the matching requirements of the components. The connecting column 400 adopts an integrated design to ensure the integrity of the base 126, the frame and the support column 802.

[0042] The structural designs of the sealing gasket 117, the valve stem 305, and the second guide sleeve 500 are closely related to form a pressure regulation and guiding system. The sealing gasket 117 is located between the valve stem 305 and the valve seat 114. It has an overall annular structure with an oil hole 118 running through the center to allow fluid to pass through. When the tapered front end 306 of the valve stem 305 contacts the sealing gasket 117, it can completely close the oil hole 117. The sealing gasket 117 is made of high-temperature resistant and high-pressure resistant materials to ensure that it will not deform or be damaged in high-pressure and high-frequency working environments. In addition, the outer edge of the sealing gasket 117 fits tightly against the inner wall of the valve seat 114, further improving the sealing performance of the system.

[0043] Furthermore, the sealing gasket 117 is completely embedded in the receiving space inside the second guide sleeve 500 .

[0044] Furthermore, the bottom of the sealing gasket 117 includes a sealing rubber ring 120 , which is used to seal the bottom surface of the mounting hole 131 so that the oil in the oil inlet hole 115 can only pass through the oil hole on the sealing gasket 117 .

[0045] The valve stem 305 is cylindrical, with a tapered structure 306 at its front end. This structure mates with the oil hole in the sealing gasket 117 to control oil pressure. The tapered design of the valve stem 305 completely seals the oil hole when pressed down, while allowing diesel to flow through when lifted. The main body of the valve stem 305 is cylindrical and precision-machined to ensure a smooth sliding fit with the inner wall of the second guide sleeve 500, reducing friction and maintaining stable movement. The upper portion of the valve stem 305 is connected to the guide post 107 via a threaded or plug-in connection, ensuring precise force transmission.

[0046] Furthermore, in order to ensure that the sliding fit between the main body of the valve stem 305 and the inner wall of the second guide sleeve 500 can achieve oil sealing and low friction resistance, the valve stem 305 and the second guide sleeve 500 need to control the following manufacturing process parameters: the fitting clearance between the outer diameter of the valve stem 305 and the inner diameter of the second guide sleeve 500 should be controlled within 0.005~0.02mm, the machining tolerances of the valve stem 305 diameter and the inner diameter of the second guide sleeve 500 need to reach ±0.003mm respectively, the cylindricity error should be ≤0.002mm, and the coaxiality error should be ≤0.01mm; the surface roughness requirements of the outer surface of the valve stem 305 and the inner wall of the second guide sleeve 500 are both controlled within Ra 0.2~0.4μm. The valve stem 305 is made of high-strength alloy steel with an HRC rating of 45-55, while the second guide sleeve 500 utilizes a low-friction alloy with an HRC rating of 30-40 to minimize wear. The outer diameter of the valve stem 305 is precision turned and cylindrically ground, while the inner diameter of the second guide sleeve 500 is precision bored or honed. Surface treatment options include hard chrome plating or titanium plating, while the inner surface of the second guide sleeve 500 is electroless nickel plating or a self-lubricating coating to further enhance wear resistance and sliding performance. The lubricant film thickness should be controlled between 0.002 and 0.005 mm, the viscosity index of the lubricant should be between 100 and 150, and the operating temperature range should be -20°C to 150°C. Quality inspection requires a coordinate measuring machine to check dimensional accuracy and coaxiality, a surface roughness tester to verify surface finish, and a leak tester to verify sealing performance at 1.5 times the operating pressure, ensuring leakage of ≤0.01 mL / min. These parameters comprehensively ensure the sliding sealing performance between the valve stem 305 and the second guide sleeve 500 while achieving low friction and high stability.

[0047] The adjusting nut 119 above the valve stem 305 is installed on the upper part of the valve stem 305 through a threaded structure, and is used to precisely adjust the length or position of the valve stem 305 to ensure a tight fit between the valve stem 305 and the guide column 107, the sealing gasket 117 and other components, thereby achieving stable pressure control. By rotating the adjusting nut 119, the axial position of the valve stem 305 can be changed, the stroke range and force transmission relationship of the valve stem 305 can be optimized, the gap between components can be eliminated, and the force transmission efficiency and working accuracy can be improved. The adjusting nut 119 is equipped with a locking device, such as a lock nut or a spring washer, which can be firmly fixed after the adjustment is completed to prevent loosening due to vibration or pressure changes. The design located on the upper part of the valve stem 305 is convenient for operation and maintenance, and precise adjustment can be completed by a simple rotation to ensure the sealing performance and operational reliability of the device under high-pressure and high-frequency working conditions.

[0048] The second guide sleeve 500 is installed in the mounting hole 131 to provide a guiding function for the valve stem 305, ensuring that the valve stem 305 remains stable and centered during movement. The inner diameter of the second guide sleeve 500 is precisely matched with the outer diameter of the valve stem 305 to form a smooth sliding channel, and the inner surface is processed with high precision to reduce movement resistance and extend service life. The material of the second guide sleeve 500 generally has high wear resistance and good lubrication properties, further reducing the friction when the valve stem 305 moves. The exterior of the second guide sleeve 500 is tightly fixed to the valve seat 114 to ensure stability in the working environment. The second guide sleeve 500 is provided with a connecting hole 501 connected to the oil outlet at the connection between the sealing gasket and the valve stem 117.

[0049] The oil seal assembly 121 consists of two parts, which are annular structures arranged upper and lower. The lower oil seal assembly 121 is in the shape of a circular ring, and the inner hole diameter matches the outer diameter of the valve stem 305. The outer peripheral surface fits with the inner wall of the second guide sleeve 500 to form a fixed sealing interface. It is usually made of elastic sealing material or rigid material with a wear-resistant coating to meet high-pressure sealing requirements.

[0050] Furthermore, the oil seal assembly 121UN features a Y-shaped, high-temperature-resistant, low-friction seal ring. Its Y-shaped design enhances sealing performance as oil pressure increases, creating a tight fit with the outer wall of the valve stem 305 and the inner wall of the second guide sleeve 500. This seal ring achieves an adaptive seal under diesel flow pressure, ensuring no diesel leakage during the upward and downward movement of the valve stem 305. Its low friction ensures smooth movement of the valve stem 305, without resistance or sticking, ensuring precise and stable operation. Furthermore, this sealing structure effectively avoids delays and interference caused by leakage or friction fluctuations in data acquisition during high-pressure environments, providing reliable assurance for efficient system operation and data stability.

[0051] The structure of the limiting device 601 is annular in design and is installed as a whole above the oil seal assembly 121 to limit the axial position of the oil seal assembly 121. Its bottom is in direct contact with the oil seal assembly 121, and its outer diameter matches the inner wall of the second guide sleeve 500 to form a fixed support relationship, thereby ensuring that the oil seal assembly 121 does not shift in position under high pressure or high-speed movement conditions. The upper outer side of the limiting device 601 is usually a hexagonal nut structure, which is used to combine with the second guide sleeve 500 or other upper structures to ensure the overall stability of the device. The internal center aperture matches the outer diameter of the valve stem 305 to ensure that the valve stem 305 is not interfered with during movement, while maintaining the linear axial movement of the valve stem 305. The limiting device 601 is made of high-strength material, which can not only withstand the high-pressure environment inside the device, but also provide effective support and positioning for the oil seal assembly 121.

[0052] This solution utilizes a independently designed pneumatically actuated diaphragm structure. Gas flows through air hole 106 into the air hole 106 on the outer cover of the pneumatically actuated diaphragm, entering the enclosed space formed between the outer cover and the actuated diaphragm 200. Air pressure acts on the actuated diaphragm 200, actuating the guide post 107 and, consequently, the valve stem 305, adjusting its opening to control the output pressure of the diesel pressure control valve 113.

[0053] During the control process, diesel flows in through the oil inlet 115 at the bottom of the valve seat 114 and out through the side through the gap between the sealing gasket 117 and the valve stem 305. The diesel pressure flowing into the bottom of the valve seat 114 is collected in real time and analyzed and fed back through software. When the pressure is lower than the required value, the software instructs the air source pressure to increase, causing the movable diaphragm 200 to move downward, driving the valve stem 305 downward to increase the pressure. When the pressure is higher than the required value, the software instructs the air source pressure to decrease. The diesel pressure acts on the tapered front end 306 of the valve stem 305, causing it to move upward, driving the movable diaphragm 200 to rebound and reduce the pressure. When the pressure equals the required value, the system maintains dynamic equilibrium, maintaining a stable pressure output by rapidly switching between increasing and decreasing pressure commands, thus achieving both pressure stabilization and pressure control. Through this structural and process design, the solution achieves precise control of diesel pressure, efficient response, and stable output, providing comprehensive support for data collection and workflow.

[0054] Furthermore, during the control process, the diesel flow direction is as follows Figure 2 The direction indicated by the dotted arrow F.

[0055] The dynamic balance between pneumatic and hydraulic pressure is achieved through the dynamic diaphragm 200 control module. By using precise displacement control and flow regulation of the hydraulic structure, the pressure can be stably controlled within the set tolerance range regardless of large or small flow, ultra-high pressure or low pressure, thus avoiding the problems of pressure instability and slow response, and eliminating the resistance when the cylinder moves, ensuring the reliability and stability of the entire detection process.

[0056] This application has achieved a number of technological advancements in the field of diesel pressure regulation through innovative design, as follows:

[0057] 1. Precise control and dynamic balance

[0058] This application combines a pneumatically actuated diaphragm with hydraulic flow control to precisely achieve dynamic pressure balance, maintaining pressure within a set tolerance regardless of flow rate or volume, or high or low pressure. This design effectively overcomes the sluggish response and pressure fluctuations often associated with traditional pressure regulators under extreme operating conditions.

[0059] 2. Efficient sealing and resistance-free movement

[0060] The application of a UN Y-shaped, high-temperature-resistant, low-friction seal ring resolved the issues of diesel leakage and resistance to valve stem 305 movement. The ring's adaptive Y-shaped structure enhances sealing performance under high pressure while maintaining smooth movement of valve stem 305, ensuring stable and efficient system operation.

[0061] 3. Flow stability and precise regulation

[0062] The valve stem and seat are precision-machined and feature a tapered front end, ensuring stable flow output even at minimal flow rates. The flow-guiding structure also enables precise switching between high and low flow rates. This dual optimization enhances fluid control accuracy and system adaptability.

[0063] 4. Modularization and structural optimization

[0064] The overall system consists of multiple modular components, including a dynamic diaphragm control module, a low-pressure sealing module, a flow regulation module and auxiliary accessories. Each module has a clear function and works closely together. The overall structure is compact and the layout is reasonable, making it easy to assemble, maintain and upgrade.

[0065] 5.Automated control and real-time adjustment

[0066] This application achieves real-time monitoring and automatic regulation of diesel pressure through data acquisition and software control. The system automatically adjusts the gas source pressure based on the collected pressure value, driving the dynamic response of the diaphragm 200 and valve stem 305, ensuring the accuracy and stability of the pressure output, significantly improving regulation efficiency and operational convenience.

[0067] 6. High reliability and adaptability

[0068] The system design fully considers the use environment of high pressure, high temperature and frequent operation, selects high temperature resistant and wear-resistant materials, and improves the stability and reliability of the system under long-term high load conditions through the optimized design of sealing and limiting structures.

Claims

1. A diesel pressure control device, characterized in that: include: a first side cover and a second side cover; The first side of the movable diaphragm and the first side cover form a sealed cavity, and the sealed cavity includes an air inlet hole; The second side of the movable diaphragm is connected to a guide post, and the guide post extends out of the second side cover; The guide column is connected to the valve stem of the diesel pressure control valve; The air inlet is connected to an air source, and the actuating diaphragm moves the guide column as the air pressure of the air source acts on it, thereby actuating the valve stem to control the output pressure of the diesel pressure control valve.

2. The diesel pressure control device according to claim 1, characterized in that: The movable diaphragm is connected to a first gasket and a second gasket; The first gasket is arranged on a first side of the movable diaphragm; The second gasket is arranged on the second side of the movable diaphragm; The guide post is connected to the second gasket.

3. The diesel pressure control device according to claim 2, characterized in that: The second side cover is provided with a hole for the guide post to pass through; A first guide sleeve is arranged around the hole.

4. The diesel pressure control device according to claim 1, characterized in that: Also includes: a connecting post, used for connecting the second side cover and the diesel pressure control valve; The connecting column includes a side opening for exposing the valve stem.

5. The diesel pressure control device according to claim 4, characterized in that: The top of the valve stem includes a valve stem length adjustment nut; One end of the adjusting nut is matched with the guide post; The opening is used to expose the valve stem length adjusting nut.

6. The diesel pressure control device according to claim 1, characterized in that: The diesel pressure control valve includes a valve seat; An oil inlet hole is provided in the valve seat; An oil outlet hole communicating with the oil inlet hole is provided in the valve seat; The junction where the oil inlet hole and the oil outlet hole communicate with each other includes a sealing gasket; The sealing gasket includes an oil hole; The front end of the valve stem is provided with a tapered front end for sealing the oil hole.

7. The diesel pressure control device according to claim 6, characterized in that: The valve stem is arranged in the mounting hole of the valve seat; A second guide sleeve for guiding the valve stem is provided in the mounting hole; The second guide sleeve surrounds the valve stem.

8. The diesel pressure control device according to claim 7, characterized in that: The second guide sleeve is provided with a connecting hole connected with the oil outlet hole at the connection between the sealing gasket and the valve stem.

9. The diesel pressure control device according to claim 8, characterized in that: An oil seal assembly is provided above the second guide sleeve, and the oil seal assembly is used for axially sealing the valve stem; a limiting device connected to the inner wall of the mounting hole is provided above the oil seal assembly.

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