High-pressure distribution plunger

Abstract

The utility model provides a high-pressure distribution plunger, which relates to the technical field of distribution pumps, and comprises a plunger head and a plunger body, the center of the head of the plunger body is provided with a central hole, the peripheral surface of the plunger body is also provided with a distribution groove, the central hole is communicated with the distribution groove through a distribution hole, and when the plunger rotates, the distribution groove is communicated with the distribution hole. The high-pressure distribution plunger is communicated with all cylinders according to the oil injection sequence, high-pressure oil is fed into the corresponding cylinders, an oil return hole is obliquely formed in the outer circumferential face of the plunger body, the tail end of the oil return hole is communicated with the distribution groove, and when the plunger rises to the position that the oil return hole is opened, a whole high-pressure oil way is communicated with a low-pressure chamber, and the high-pressure oil is rapidly relieved. In view of the defects that a deep center hole is formed in a traditional plunger, machining is difficult and the percent of pass is not high in the manufacturing process, an oil return hole is obliquely formed and communicated with a distribution groove, and the distribution groove is communicated with the center hole through a distribution hole, so that the length of the center hole is shortened, the machining difficulty of the center hole is reduced, and the machining efficiency is improved. And the qualified rate of the plunger is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of distribution pumps, in particular to a high-pressure distribution plunger. Background Art

[0002] The high-pressure distribution plunger is an indispensable and important component in the high-pressure distribution pump of a diesel engine. It mainly exists in the high-pressure system of the distribution pump and refers to a device used to control the pressure and flow distribution in the diesel engine fuel injection system. The plunger can move in the diesel engine high-pressure distribution pump to change the flow direction and pressure of the diesel fluid. The high-pressure distribution plunger is usually used in valves and regulators in the diesel engine fuel injection system. By controlling the position and movement of the plunger, the pressure and flow in the diesel engine fuel injection system can be accurately adjusted to meet different working requirements.

[0003] like Figure 1 As shown, a deep center hole is opened in the traditional high-pressure distribution plunger, which is difficult to process and has a low pass rate. Utility Model Content

[0004] 1. Technical issues to be solved

[0005] In view of the deficiencies in the prior art, the utility model provides a high-pressure distribution plunger, which solves the problems raised in the above-mentioned background technology.

[0006] (II) Technical solution

[0007] To achieve the above purpose, the utility model is implemented through the following technical solutions: a high-pressure distribution plunger, including a plunger head and a plunger body, a center hole is opened in the center of the plunger body head, and a distribution groove is also opened on the outer circumferential surface of the plunger body. The center hole and the distribution groove are connected through the distribution hole. When the plunger rotates, it is connected with each cylinder according to the injection order, and the high-pressure oil is sent to each corresponding cylinder. An oil return hole is obliquely opened on the outer circumferential surface of the plunger body, and the end of the oil return hole is connected with the distribution groove. When the plunger is raised and the oil return hole is opened, the entire high-pressure oil circuit is connected to the low-pressure chamber, and the high-pressure oil is quickly relieved.

[0008] Preferably, a positioning groove is axially opened on the outer circumferential surface of the plunger head, and the positioning groove plays a positioning role, as well as processing other holes and grooves on the plunger.

[0009] Preferably, a connecting groove is provided at the center of the outer end surface of the plunger head for connecting to a cam plate, and the cam plate drives the plunger to perform reciprocating linear motion.

[0010] Preferably, the diameter of the central hole is Φ2.2.

[0011] Preferably, a plurality of oil inlet grooves are provided at equal angles on the circumference of the head of the plunger body, and the number of the oil inlet grooves is the same as the number of cylinders of the diesel engine.

[0012] Preferably, there are four oil inlet grooves, each of which is responsible for the oil inlet task of the corresponding cylinder, and introduces the low-pressure oil in the pump chamber into the high-pressure chamber.

[0013] Preferably, pressure equalizing grooves are provided at equal angles on the outer circle of the plunger body.

[0014] (III) Beneficial effects

[0015] The utility model provides a high-pressure distribution plunger, which has the following beneficial effects:

[0016] The high-pressure distribution plunger is used in conjunction with a high-pressure distribution pump. During the manufacturing process, the disadvantages of a traditional plunger having a very deep center hole, which is difficult to process and has a low pass rate are taken into consideration. By opening an oil return hole obliquely to connect the distribution groove, and the distribution groove is connected to the center hole through the distribution hole, the length of the center hole is shortened, the difficulty of processing the center hole is reduced, and the pass rate of the plunger is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the existing high-pressure distribution plunger structure;

[0018] Figure 2 This is a schematic diagram of the high-pressure distribution plunger structure of the utility model;

[0019] Figure 3 for Figure 2 C-direction view;

[0020] Figure 4 for Figure 2 D-direction view;

[0021] Figure 5 This is a cross-sectional view of the high-pressure distribution plunger of the utility model;

[0022] Figure 6 for Figure 5 EE cross-sectional view.

[0023] In the figure: 1. connecting groove; 2. distribution plunger body; 3. oil return hole; 4. pressure equalizing groove; 5. center hole; 6. oil inlet groove; 7. distribution groove; 8. distribution hole; 9. positioning groove; 10. plunger head. DETAILED DESCRIPTION

[0024] like Figure 1 As shown, the conventional plunger has a deep center hole 5 in the upper head, which is difficult to process and has a low pass rate. The embodiment of the utility model provides a high-pressure distribution plunger, such as Figure 2-6 As shown, a positioning groove 9 is provided on the high pressure distribution plunger body 2, and the positioning groove 9 is mainly used for positioning and processing other holes and grooves on the body.

[0025] like Figure 2 As shown, a connecting groove 1 is provided on the plunger body for connecting to a cam plate, and the cam plate drives the plunger to perform reciprocating linear motion.

[0026] like Figure 6 As shown, the plunger body is provided with a distribution groove 7 and a distribution hole 8. When the plunger rotates, it is connected with each cylinder in the injection order and the high-pressure oil is sent into each corresponding cylinder.

[0027] like Figure 2 and 4 As shown, the plunger body is provided with an oil inlet groove 6, and the number of the oil inlet grooves 6 is the same as the number of cylinders of the diesel engine. These oil inlet grooves 6 are evenly distributed on the plunger head 10 parts, and each groove is responsible for the oil inlet task of the corresponding cylinder, and introduces the low-pressure oil in the pump chamber into the high-pressure chamber. The plunger of this embodiment has four oil inlet grooves 6, which are used in a four-cylinder diesel pump.

[0028] like Figure 2 and 5 As shown, the plunger body is provided with an oil return hole 3. The oil return hole 3 is located at the large outer circle of the plunger and communicates with the distribution groove 77. When the plunger rises and the oil return hole 3 is opened, the entire high-pressure oil circuit is communicated with the low-pressure chamber, and the high-pressure oil is quickly depressurized.

[0029] like Figure 5 and 6 As shown, a pressure equalizing groove 4 is provided on the plunger body, and its function is to communicate the high-pressure oil circuit under the oil outlet valve with the inner cavity of the pump chamber, so that the residual pressure of the high-pressure oil circuit of each cylinder can be kept consistent, which is beneficial to improving the uniformity of oil supply to each cylinder.

[0030] The plunger body has a central hole 5: The plunger shortens the length of the central hole 5 to improve efficiency and qualified rate. The plunger central hole 5 is reduced from the original Φ2.5 hole to Φ2.2 hole, the purpose of which is to reduce the high-pressure volume and increase the injection pressure.

[0031] Working principle:

[0032] The diesel engine high-pressure distribution pump is a key component used in the diesel engine fuel injection system, which is used to provide pressure and flow to the diesel engine fuel injection system. It usually consists of a plunger, plunger sleeve and other working parts. Its main function is to convert mechanical energy into hydraulic energy, so that the diesel engine fuel injection system can achieve various working functions.

[0033] The high-pressure distribution pump relies on the reciprocating and rotating motion of the plunger in the cylinder to change the volume of the sealed working chamber to achieve oil suction and oil pressure. Its specific working principle is:

[0034] When the high-pressure distribution pump is working, the injection pump cam plate and the plunger spring force the plunger to move up and down and rotate, thereby completing the oil pumping task. The oil pumping process can be divided into the following two stages:

[0035] 1. Oil intake process

[0036] When the raised part of the cam turns, the plunger moves downward under the action of the spring force, and a vacuum is generated in the space above the plunger (called the oil pump chamber). When the plunger enters the oil groove 6 to open the oil inlet hole on the plunger sleeve, the diesel fuel filling the oil channel in the upper body of the oil pump enters the oil pump chamber through the oil hole. The plunger moves to the bottom dead center and the oil intake ends.

[0037] 2. Oil return process

[0038] The plunger supplies oil upwards. When the oil return hole 3 (stop supply edge) on the plunger is connected to the oil control edge on the oil control ring, the low-pressure oil circuit of the pump oil chamber communicates with the center hole 5, distribution hole 8 and distribution groove 7 of the plunger head 10. The oil pressure drops suddenly, and the oil outlet valve is quickly closed under the action of the spring force to stop the oil supply. After that, the plunger will move upwards again. When the raised part of the cam turns over, the plunger moves downward again under the action of the spring. At this time, the next cycle begins.

[0039] To sum up, the high-pressure distribution plunger is used with a high-pressure distribution pump. During the manufacturing process, the disadvantages of a deep center hole 5 formed in the traditional plunger, which is difficult to process and has a low pass rate are taken into consideration. By forming an oil return hole 3 obliquely to connect the distribution groove 7, and connecting the distribution groove 7 with the center hole 5 through the distribution hole 8, the length of the center hole 5 is reduced, the difficulty of processing the center hole 5 is reduced, and the pass rate of the plunger is improved.

[0040] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high pressure dispensing plunger, characterized in that: The invention comprises a plunger head (10) and a plunger body (2). A center hole (5) is provided at the center of the head of the plunger body (2). A distribution groove (7) is also provided on the outer peripheral surface of the plunger body (2). The center hole (5) and the distribution groove (7) are connected through a distribution hole (8). When the plunger rotates, it is connected to each cylinder of the diesel engine in the order of injection and high-pressure oil is sent to each corresponding cylinder. An oil return hole (3) is obliquely provided on the outer peripheral surface of the plunger body (2). The end of the oil return hole (3) is connected to the distribution groove (7). When the plunger rises and the oil return hole (3) is opened, the entire high-pressure oil circuit is connected to the low-pressure chamber, and the high-pressure oil is quickly relieved.

2. A high pressure dispensing plunger according to claim 1, characterized in that: The outer circumferential surface of the plunger head (10) is axially provided with a positioning groove (9), which plays a positioning role and is used to process the remaining holes and grooves on the plunger.

3. A high pressure dispensing plunger according to claim 1, characterized in that: A connecting groove (1) is provided at the center of the outer end surface of the plunger head (10) for connecting to a cam plate, and the cam plate drives the plunger to perform reciprocating linear motion and rotational motion.

4. A high pressure dispensing plunger according to claim 1, characterized in that: The diameter of the central hole (5) is Φ2.

2.

5. A high pressure dispensing plunger according to claim 1, characterized in that: A plurality of oil inlet grooves (6) are provided at equal angles on the circumference of the head of the plunger body (2), and the number of the oil inlet grooves (6) is the same as the number of cylinders of the diesel engine.

6. A high pressure dispensing plunger according to claim 5, characterized in that: There are four oil inlet grooves (6), and each oil inlet groove (6) is responsible for the oil inlet task of the corresponding cylinder, and introduces the low-pressure oil in the pump chamber into the high-pressure chamber.

7. A high pressure dispensing plunger according to claim 1, characterized in that: The outer circle of the plunger body (2) is provided with pressure equalizing grooves (4) at equal angles.

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