Oil nozzle matching part needle valve for diesel engine

Abstract

The utility model provides an oil nozzle matching part needle valve for a diesel engine, which relates to the technical field of oil nozzle accessories and comprises a shell, a sealing plug is arranged at one end of the shell, a needle valve rod is slidably arranged in the sealing plug, an annular plate is sleeved on a rod body of the needle valve rod, and a sealing sleeve is arranged on one side, close to the sealing plug, of the annular plate. When a sealing sleeve is abraded, a worker pulls a push block to drive an insertion block to be separated from a corresponding insertion groove, a second spring is compressed under stress, then the worker pulls a limiting ring to be separated from an annular groove, and then the worker controls the sealing sleeve to move along a rod body of a needle valve rod. And then the sealing sleeve is disassembled by a worker, so that the sealing performance of the sealing sleeve is prevented from being influenced under the condition that one side of the sealing sleeve is worn for a long time, the problems of fuel oil leakage, unstable injection pressure and the like are prevented, unsmooth movement or clamping stagnation of the needle valve rod is avoided, and further influence on normal work of the oil nozzle is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injection nozzle accessories, in particular to a fuel injection nozzle pair needle valve for a diesel engine. Background Art

[0002] The working principle of the needle valve of the injector is based on the interaction between fuel pressure and precision mechanical structure. When the high-pressure diesel from the injection pump enters the oil inlet channel on the injector body and then enters the annular oil chamber in the middle of the needle valve body, it will act on the pressure-bearing cone surface of the needle valve, forming an upward axial thrust. When this thrust is greater than the pre-pressure of the injector pressure regulating spring, the needle valve will move upward. When the needle valve stem moves back and forth at high speed, the sealing sleeve of the needle valve stem will continuously collide with the inner wall of the housing, resulting in wear on one side of the sealing sleeve over a long period of time. The wear of the sealing sleeve will not only affect its sealing performance, but also may cause fuel leakage, unstable injection pressure and other problems, thereby affecting the combustion efficiency and performance of the diesel engine. In addition, wear may also aggravate the friction between the needle valve stem and the inner wall of the housing, increase energy consumption, and may cause the needle valve stem to move poorly or get stuck, further affecting the normal operation of the injector. Utility Model Content

[0003] The main purpose of the utility model is to provide a diesel engine fuel injection nozzle needle valve, which can effectively solve the problem that when the needle valve rod moves back and forth at high speed, the sealing sleeve of the needle valve rod will continuously collide with the inner wall of the shell, resulting in wear on one side of the sealing sleeve over a long period of time. The wear of the sealing sleeve will not only affect its sealing performance, but also may cause fuel leakage, unstable injection pressure and other problems, thereby affecting the combustion efficiency and performance of the diesel engine. In addition, wear may also aggravate the friction between the needle valve rod and the inner wall of the shell, increase energy consumption, and may cause the needle valve rod to move poorly or get stuck, further affecting the normal operation of the fuel injection nozzle.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A diesel engine fuel injection nozzle needle valve pair, comprising a housing, a sealing plug is arranged at one end of the housing, a needle valve stem is slidably arranged in the sealing plug, a ring plate is sleeved on the needle valve stem, a sealing sleeve is arranged on the side of the ring plate close to the sealing plug, and the sealing sleeve is sleeved on the needle valve stem;

[0006] A first connecting component is provided on the side of the annular plate close to the sealing sleeve, and a second connecting component is provided on the surface of the side of the sealing sleeve close to the annular plate. The annular plate and the sealing sleeve are connected through the first connecting component and the second connecting component.

[0007] A limit sleeve is arranged inside the outer shell, and a first spring is sleeved on the body of the limit sleeve;

[0008] One end of the outer shell is provided with a first threaded section.

[0009] Preferably, the first connection component includes a limit ring. The limit ring is fixedly installed on the side of the annular plate close to the sealing sleeve, and two slots are arranged on the surface of the body of the limit ring.

[0010] Preferably, the second connection component includes an annular groove, and the annular groove is inserted and matched with the limit ring;

[0011] Two stepped holes are arranged on the surface of the body of the limit ring. Two sliding rods are slidably arranged in the two stepped holes. Plug blocks are fixedly installed at the opposite ends of the two sliding rods. The two plug blocks are respectively inserted and matched with the corresponding slots. Push blocks are fixedly installed at the opposite ends of the two sliding rods away from each other;

[0012] A second spring is sleeved on one side of the two sliding rods close to the corresponding plug blocks.

[0013] Preferably, a first sealing ring is sleeved on the body of the needle valve rod, and one side surface of the first sealing ring is an arc surface.

[0014] Preferably, a threaded groove is arranged at one end of the sealing plug. A second threaded section is arranged on one side of the inner wall of the outer shell, and the second threaded section is in threaded cooperation with the threaded groove.

[0015] Preferably, a second sealing ring is fixedly installed at the other end of the sealing plug. A limit groove is arranged on the surface of the inner wall of the outer shell close to the second sealing ring, and the second sealing ring is inserted and matched with the limit groove.

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

[0017] (1) When the sealing sleeve is worn, the staff pulls the push block to drive the plug block to disengage from the corresponding slot, and the second spring is compressed under force. Then the staff pulls the limit ring to disengage it from the annular groove. Then the staff controls the sealing sleeve to move along the body of the needle valve rod, and then the staff disassembles the sealing sleeve, avoiding the influence of the sealing performance of the sealing sleeve due to long-term wear on one side, preventing problems such as fuel leakage and unstable injection pressure, and avoiding poor movement or jamming of the needle valve rod, thereby avoiding further affecting the normal operation of the fuel injector. Description of the Drawings

[0018] Figure 1 It is a schematic diagram of the overall structure of a fuel injector needle valve for a diesel engine of the present utility model;

[0019] Figure 2This is a top view structural schematic diagram of the needle valve of an injector nozzle pair for a diesel engine according to the present utility model;

[0020] Figure 3 This is the Figure 2 structural schematic diagram of the A-A cross-section of the needle valve of an injector nozzle pair for a diesel engine according to the present utility model;

[0021] Figure 4 This is the Figure 3 enlarged schematic diagram of the structure at A of the needle valve of an injector nozzle pair for a diesel engine according to the present utility model;

[0022] Figure 5 This is the Figure 3 enlarged schematic diagram of the structure at B of the needle valve of an injector nozzle pair for a diesel engine according to the present utility model.

[0023] In the figure: 1. Outer shell; 101. First threaded section; 2. Sealing plug; 3. Needle valve rod; 4. Annular plate; 5. Sealing sleeve; 6. First connection assembly; 601. Limiting ring; 602. Slot; 7. Second connection assembly; 701. Annular groove; 702. Step hole; 703. Slide rod; 704. Insert block; 705. Push block; 706. Second spring; 8. Limiting sleeve; 9. First spring; 10. Second threaded section; 11. Second sealing ring; 12. Limiting groove; 13. Threaded groove; 14. First sealing ring. Detailed implementation manners

[0024] Next, in combination with the embodiments of the present utility model, the technical solutions in the embodiments of the present utility model will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments in the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0025] As Figures 1 - 5 shown, a needle valve of an injector nozzle pair for a diesel engine includes an outer shell 1. A sealing plug 2 is arranged at one end of the outer shell 1. A needle valve rod 3 is slidably arranged in the sealing plug 2. An annular plate 4 is sleeved on the rod body of the needle valve rod 3. A sealing sleeve 5 is arranged on the side of the annular plate 4 close to the sealing plug 2, and the sealing sleeve 5 is sleeved on the rod body of the needle valve rod 3;

[0026] A first connection assembly 6 is arranged on the side of the annular plate 4 close to the sealing sleeve 5. A second connection assembly 7 is arranged on the surface of the sealing sleeve 5 close to the annular plate 4. The annular plate 4 and the sealing sleeve 5 are connected through the first connection assembly 6 and the second connection assembly 7;

[0027] A limiting sleeve 8 is arranged in the outer shell 1, and a first spring 9 is sleeved on the sleeve body of the limiting sleeve 8;

[0028] One end of the outer shell 1 is provided with a first threaded section 101.

[0029] The first connection component 6 includes a limit ring 601. The limit ring 601 is fixedly installed on the side of the annular plate 4 close to the sealing sleeve 5 where the first connection component 6 is provided. Two slots 602 are provided on the surface of the body of the limit ring 601.

[0030] The second connection component 7 includes an annular groove 701. The annular groove 701 is inserted and matched with the limit ring 601;

[0031] Two stepped holes 702 are provided on the surface of the body of the limit ring 601. Two sliding rods 703 are slidably arranged in the two stepped holes 702. Plug blocks 704 are fixedly installed at the opposite ends of the two sliding rods 703. The two plug blocks 704 are respectively inserted and matched with the corresponding slots 602. Push blocks 705 are fixedly installed at the opposite ends of the two sliding rods 703 away from each other;

[0032] A second spring 706 is sleeved on one side of the two sliding rods 703 close to the corresponding plug blocks 704.

[0033] After the needle valve rod 3 is subjected to the pressure of the fuel, it moves along the outer shell 1. Under the elastic force of the first spring 9, the needle valve rod 3 reciprocates. High-pressure diesel enters the oil inlet passage on the injector body. When the sealing sleeve 5 is worn, the staff pulls the push block 705 to drive the plug block 704 to disengage from the corresponding slot 602. The second spring 706 is compressed under force. Then the staff pulls the limit ring 601 to disengage it from the annular groove 701. Then the staff controls the sealing sleeve 5 to move along the body of the needle valve rod 3. Then the staff disassembles the sealing sleeve 5, avoiding the influence of the sealing performance due to the long-term wear on one side of the sealing sleeve 5, preventing problems such as fuel leakage and unstable injection pressure, and avoiding the poor movement or jamming of the needle valve rod 3, so as to avoid further affecting the normal operation of the fuel injector nozzle.

[0034] In another embodiment of the present utility model, a first sealing ring 14 is sleeved on the body of the needle valve rod 3, and one side surface of the first sealing ring 14 is an arc surface.

[0035] By setting the first sealing ring 14, when the sealing sleeve 5 is installed on the needle valve rod 3, the gap distance between its inner wall and the needle valve rod 3 is greatly reduced, further avoiding the occurrence of fuel leakage.

[0036] In another embodiment of the present utility model, one end of the sealing plug 2 is provided with a threaded groove 13, and a second threaded section 10 is provided on one side of the inner wall of the outer shell 1. The second threaded section 10 is in threaded cooperation with the threaded groove 13.

[0037] By disassembling the sealing plug 2, it is convenient for the staff to take out the needle valve rod 3 and remove the sealing sleeve 5, facilitating the maintenance by the staff.

[0038] In another embodiment of the present utility model, a second sealing ring 11 is fixedly installed at the other end of the sealing plug 2, and a limiting groove 12 is formed on the inner wall surface of the outer shell 1 near the second sealing ring 11, and the second sealing ring 11 is inserted and matched with the limiting groove 12.

[0039] With the insertion and matching of the second sealing ring 11 and the limiting groove 12, the sealing performance inside the outer shell 1 is further enhanced, and fuel leakage is further avoided.

[0040] The working principle of the needle valve of an injection nozzle pair for a diesel engine is as follows:

[0041] During use, when the needle valve rod 3 is subjected to the pressure of fuel, it moves along the outer shell 1. Under the elastic force of the first spring 9, the needle valve rod 3 reciprocates. High-pressure diesel enters the oil inlet passage on the injector body. When the sealing sleeve 5 is worn, the operator pulls the push block 705 to drive the insertion block 704 to disengage from the corresponding slot 602, and the second spring 706 is compressed. Then, the operator pulls the limiting ring 601 to disengage it from the annular groove 701. Then, the operator controls the sealing sleeve 5 to move along the rod body of the needle valve rod 3, and then the operator disassembles the sealing sleeve 5 to prevent the sealing performance from being affected due to long-term wear on one side of the sealing sleeve 5, and to prevent problems such as fuel leakage and unstable injection pressure, and to avoid poor movement or jamming of the needle valve rod 3, so as not to further affect the normal operation of the injection nozzle.

[0042] Obviously, the above embodiments of the present utility model are merely examples for clearly illustrating the present utility model, rather than limiting the implementation manners of the present utility model. For those of ordinary skill in the art, other different forms of changes or variations can be made based on the above description. It is impossible to list all the implementation manners here. Any obvious changes or variations derived from the technical solutions of the present utility model still fall within the protection scope of the present utility model.

Claims

1. A diesel engine fuel injection nozzle needle valve, comprising a housing (1), characterized in that: A sealing plug (2) is provided at one end of the housing (1), a needle valve stem (3) is slidably provided in the sealing plug (2), a ring plate (4) is sleeved on the stem of the needle valve stem (3), a sealing sleeve (5) is provided on the side of the ring plate (4) close to the sealing plug (2), and the sealing sleeve (5) is sleeved on the stem of the needle valve stem (3); A first connecting component (6) is provided on the side of the annular plate (4) close to the sealing sleeve (5), and a second connecting component (7) is provided on the surface of the side of the sealing sleeve (5) close to the annular plate (4); the annular plate (4) and the sealing sleeve (5) are connected via the first connecting component (6) and the second connecting component (7); A limiting sleeve (8) is arranged inside the housing (1), and a first spring (9) is arranged on the limiting sleeve (8); A first threaded section (101) is formed at one end of the housing (1).

2. A diesel engine fuel injection nozzle assembly needle valve according to claim 1, characterized in that: The first connection component (6) comprises a limiting ring (601), and the limiting ring (601) is fixedly mounted on a side of the annular plate (4) close to the sealing sleeve (5). The first connection component (6) is arranged, and the surface of the limiting ring (601) is provided with two slots (602).

3. A diesel engine fuel injection nozzle assembly needle valve according to claim 2, characterized in that: The second connecting component (7) comprises an annular groove (701), and the annular groove (701) is interlaced and matched with the limiting ring (601); The surface of the limiting ring (601) is provided with two stepped holes (702), and a slide bar (703) is slidably arranged in each of the two stepped holes (702). An insert block (704) is fixedly installed at one opposite end of the two slide bars (703), and the two insert blocks (704) are respectively inserted and matched with the corresponding slots (602). A push block (705) is fixedly installed at one end of the two slide bars (703) away from each other. A second spring (706) is sleeved on one side of the two slide bars (703) close to the corresponding insert block (704).

4. The diesel engine fuel injection nozzle assembly needle valve according to claim 1, characterized in that: The needle valve rod (3) is sleeved with a first sealing ring (14), and one side surface of the first sealing ring (14) is an arc surface.

5. The diesel engine fuel injection nozzle assembly needle valve according to claim 1, characterized in that: A thread groove (13) is provided at one end of the sealing plug (2), and a second thread segment (10) is provided on one side of the inner wall of the housing (1), wherein the second thread segment (10) is threadably matched with the thread groove (13).

6. The diesel engine fuel injection nozzle assembly needle valve according to claim 1, characterized in that: A second sealing ring (11) is fixedly mounted on the other end of the sealing plug (2); a limiting groove (12) is provided on the inner wall of the housing (1) on one side close to the second sealing ring (11); the second sealing ring (11) is inserted and matched with the limiting groove (12).

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