Filter screen pipe and oil sprayer connector

Abstract

The utility model relates to the technical field of oil sprayers, in particular to a filter screen pipe and an oil sprayer connector using the filter screen pipe, the filter screen pipe comprises a bush of a tubular structure, a plurality of oil inlet holes are formed in the bush, and a filter screen is further arranged on the outer wall of the bush; the first connecting part is located at one end of the bush, the second connecting part is located at the other end of the bush, and an oil outlet hole is formed in the second connecting part. Wherein the filter screen located on the outermost side of the filter screen pipe can filter solid particle impurities in fuel oil, and the impurities are intercepted outside the filter screen. The filter screen pipe is a filter screen on the cylindrical outer circle face of the whole filter screen pipe and participates in high-pressure oil filtering, the filter screen pipe is assembled in the oil sprayer connector, fuel oil can be efficiently filtered, the cleanliness of the fuel oil entering the oil sprayer is improved, and the fuel oil spraying efficiency is improved. And the risk of performance failure of the fuel injector caused by the problem of fuel cleanliness in the working process of the fuel injector is effectively reduced.

Description

Technical Field

[0001] The present application relates to the technical field of fuel injectors, and in particular to a filter tube and a fuel injector joint. Background Art

[0002] The high-pressure common rail system is an advanced fuel system that meets diesel engine emission standards above Euro III, and is the direction of development of diesel engine fuel systems. With the continuous improvement of emission requirements, the demand for injection pressure of the high-pressure common rail system and the geometric shape and processing accuracy of the structural parts in the system are also constantly improving; for example, the aperture of the nozzle of the injector is getting smaller and smaller, and the matching clearance of the plunger of the diesel engine injection pump is only 0.0015~0.0020mm, and the clearance of the needle valve guide part of the injector is 0.002~0.004mm. After improving the processing accuracy of the product, reducing the clearance of the matching parts, and reducing the aperture of the spray hole, the cleanliness of the system has become a prominent problem that restricts the consistency and stability of the working parameters of the common rail system components.

[0003] Since the fuel pressure in the high-pressure common rail system is very high, if the particulate impurities in the fuel cause low cleanliness in the system, it will cause the valves in the system to delay or get stuck, or increase valve wear, affecting the normal operation of the system; it may even cause damage to the injectors, high-pressure pumps and other parts; in addition, impurities in the fuel will also affect the accuracy of fuel injection and combustion efficiency, resulting in reduced engine performance and even noise and emission problems.

[0004] Therefore, how to ensure that the fuel flowing into the high-pressure common rail system has a high degree of cleanliness has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The utility model aims to provide a filter pipe and a fuel injector joint using the filter pipe, wherein the filter pipe can filter solid impurities in the fuel to ensure that the fuel flowing into the high-pressure common rail system has a high degree of cleanliness.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A filter pipe comprises a tubular bushing with a plurality of oil inlet holes and a filter screen on the outer wall of the bushing; it also comprises a first connection part at one end of the bushing and a second connection part at the other end of the bushing, wherein the second connection part is provided with an oil outlet hole.

[0008] Furthermore, the first connecting portion and the second connecting portion are both provided with connecting grooves, and both ends of the bushing are clamped in the connecting grooves.

[0009] Furthermore, the connecting groove includes a positioning wall located on the inner side and a fastening wall located on the outer side, and the fastening wall is made of elastic material.

[0010] The utility model also provides an injector joint, comprising a joint body, a sealing portion is provided at one end of the joint body, an oil outlet is provided at the other end, a accommodating cavity is provided between the sealing portion and the oil outlet, and the filter screen tube as described above is provided in the accommodating cavity; and also includes an oil inlet provided on the side wall of the joint body, the oil inlet is connected to the accommodating cavity.

[0011] Furthermore, the oil inlet is located at an end away from the sealing portion.

[0012] Furthermore, the sealing portion comprises a tapered sleeve and a connecting nut abutting against each other, wherein the tapered sleeve is taperedly matched with the wall of the accommodating cavity.

[0013] Furthermore, the inner wall of the tapered sleeve is provided with a second sealing surface, the first connecting portion is provided with a first sealing surface, and the first sealing surface abuts against the second sealing surface.

[0014] Furthermore, a flow limiting valve is also arranged in the accommodating chamber; one end of the flow limiting valve abuts against the second connecting portion, and the other end is communicated with the oil outlet.

[0015] Compared with the prior art, the utility model has the following beneficial effects: the filter located at the outermost side of the filter tube can filter the solid particulate impurities in the fuel, and trap the impurities outside the filter. Moreover, since the aperture of the oil inlet hole is slightly larger than the aperture set at the filter, the clean fuel flows into the bushing more efficiently, and does not affect the subsequent operation of the fuel injector. Moreover, the filter tube is a filter on the outer surface of the entire cylinder that participates in high-pressure oil filtration and can efficiently filter the fuel. When the filter tube is assembled in the fuel injector joint, it can efficiently filter the fuel, improve the cleanliness of the fuel entering the fuel injector, and effectively reduce the risk of fuel injector performance failure caused by fuel cleanliness problems during the operation of the fuel injector. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the structure of the filter screen tube in the utility model;

[0017] Figure 2 for Figure 1 A magnified schematic diagram of the structure at center A;

[0018] Figure 3 It is a structural schematic diagram of the connecting groove in the utility model;

[0019] Figure 4 It is a structural schematic diagram of the injector joint in the utility model.

[0020] Explanation of the reference numerals: bushing 100; oil inlet 101; filter 200; first connecting portion 300; second connecting portion 400; oil outlet 401; connecting groove 500; positioning arm 501; fastening wall 502; joint body 600; sealing portion 601; tapered sleeve 6011; connecting nut 6012; oil outlet 602; accommodating chamber 603; oil inlet 604; flow limiting valve 700. DETAILED DESCRIPTION

[0021] In the description of the present invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0022] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection of two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0023] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0024] As attached Figure 1-2 As shown, the utility model discloses a filter tube, including a bushing 100 with a tubular structure, a plurality of oil inlet holes 101 are arranged at the bushing 100, and a filter 200 is also arranged on the outer wall of the bushing 100; it also includes a first connecting part 300 located at one end of the bushing 100 and a second connecting part 400 located at the other end of the bushing 100, wherein the second connecting part 400 is provided with an oil outlet hole 401.

[0025] A filter tube as described above, wherein the bushing 100 is the supporting skeleton of the filter tube, can be made of an alloy material with a certain hardness, such as cemented carbide tungsten steel, which has high hardness and good wear resistance and strength, and is suitable for high-pressure fuel environments; and then the sheet material is welded into a hollow tubular structure by welding technology, and the processing operation is simple and convenient. The bushing 100 of the tubular structure is also provided with a plurality of oil inlet holes 101, and the oil inlet holes 101 are through holes for circulating fuel, and the apertures of the plurality of oil inlet holes 101 are consistent and evenly distributed. A filter 200 is also provided at the outer wall of the bushing 100 with the oil inlet holes 101 on the surface, and the filter 200 is also adaptively set to a hollow tubular structure, matching the bushing 100, and can be sleeved on the outer wall of the bushing 100, so that the filter 200 completely wraps the tube wall of the bushing 100. The filter screen 200 is provided with a hole for filtering, the diameter of which is smaller than the diameter of the oil inlet hole 101, and is used to filter solid impurities such as metal particles and non-metallic particles in diesel. Specifically, the two ends of the bushing 100 and the filter screen 200 can be clamped by a rolling process to fix the filter screen 200 to the outer wall of the bushing 100. The two ends of the bushing 100 are respectively provided with a first connection part 300 and a second connection part 400, and the first connection part 300 and the second connection part 400 are used to fix the filter screen tube in the filter chamber of the injector, so that the filter structure can be fixed in position in a high-pressure oil environment, and can still ensure a stable connection with the filter chamber even under the impact of high-pressure oil, and will not fall off therefrom, so as to ensure the filtering stability during the use of the injector. Specifically, the first connection part 300 and the second connection part 400 can be interference-connected with the connection part of the filter chamber to ensure the connection stability of the filter structure.

[0026] The filter tube is cylindrical in shape as a whole. When in use, the cylindrical outer surface of the entire filter structure participates in the fuel filtration, so that the fuel flows through the filter 200 and then enters the bushing 100 from the multiple oil inlet holes 101 set at the bushing 100, and then flows out of the filter tube through the oil outlet hole 401 set at the end of the bushing 100 to participate in the operation of the injector. In this process, the filter 200 located at the outermost side of the filter tube can filter the solid particulate impurities in the fuel and trap the impurities outside the filter 200. Since the aperture of the oil inlet hole 101 is slightly larger than the aperture set at the filter 200, the clean fuel flows into the bushing 100 more efficiently and does not affect the subsequent operation of the injector. The filter tube is a filter on the cylindrical outer surface of the entire filter tube that participates in high-pressure oil filtration, efficiently filters the fuel, improves the cleanliness of the fuel, and effectively reduces the risk of injector performance failure caused by fuel cleanliness problems during the operation of the injector.

[0027] Further optimization, in other embodiments of the present application, a connection groove 500 can be optionally provided at both the first connection portion 300 and the second connection portion 400, and both ends of the bushing 100 are clamped with the connection groove 500. The connection groove 500 is used to fix the ends of the bushing 100 and the filter screen 200, that is, the filter screen 200 is fixedly arranged on the outer wall of the bushing 100. A clamping portion is provided at the connection groove 500, and the clamping portion matches the ends of the bushing 100 and the filter screen 200, so that the ends of the bushing 100 and the filter screen 200 can be directly plugged into the clamping portion, and there is no need to use a rolling process or a welding process to connect the bushing 100 and the filter screen 200, which reduces the production cost and installation difficulty, and the operation is simple and convenient, and the connection efficiency of the filter screen pipe is improved. The clamping method utilizes the structural fastening force to fix the bushing 100 and the filter 200 together, and the connection strength is high and has high impact resistance. That is, the connection convenience of the filter pipe is improved by setting the connection groove 500, and the practicality of the filter pipe is further improved.

[0028] Further optimization, in other embodiments of the present application, the connection groove 500 includes a positioning wall 501 located on the inner side thereof and a fastening wall 502 located on the outer wall, and the fastening wall 502 is made of elastic material. Figure 3 As shown, the end of the connection groove 500 is set to be groove-shaped, wherein the inner wall is a positioning wall 501, and the outer wall is a fastening wall 502 made of elastic material. The shape and size of the groove formed by the positioning wall 501 and the fastening wall 502 match the end of the filter tube. The positioning wall 501 is made of a material with a certain rigidity and hardness, which can resist the external force or impact that may occur during the connection process, has a stopper effect, and limits the movement range of the filter tube; and the positioning wall 501 also has an installation guide function, which can guide the filter tube to move in the correct direction to avoid deviation in the connection. The fastening wall 502 made of elastic material, when the filter tube is clamped at the connection groove 500, due to the elasticity of the material, the fastening wall can generate a certain compression or tension force, thereby firmly fastening the filter tube together and improving the connection strength of the bushing 100 and the filter 200. The cooperation between the positioning wall 501 and the fastening wall 502 ensures that the bushing 100 and the filter 200 in the filter tube are stably connected, and ensures that the filter tube is installed in the connecting groove 500 without displacement or movement, thereby achieving a stable and reliable connection effect and further improving the stability of the filter tube.

[0029] As attached Figure 4 As shown, the present application also provides an injector connector, including a connector body 600, a sealing portion 601 is provided at one end of the connector body 600, and an oil outlet 602 is provided at the other end, a accommodating chamber 603 is provided between the sealing portion 601 and the oil outlet 602, and the filter tube as described above is provided in the accommodating chamber 603, and also includes an oil inlet 604 arranged on the side wall of the connector body 600, and the oil inlet 604 is connected to the accommodating chamber 603.

[0030] The injector connector as described above is suitable for large injector bodies, and the volume of the injector is relatively large. A sealing portion 601 is provided at one end of the connector body 600, and the sealing portion 601 can seal one end of the connector body 600 with the connector body 600 through a plane seal or a cone seal to prevent fuel leakage. A receiving chamber 603 is provided between the sealing portion 601 and the oil outlet 602, and the receiving chamber 603 is communicated with the oil inlet 604 in the connector body 600, and a filter tube is also fixedly provided in the receiving chamber 603. Specifically, the first connecting portion 300 and the second connecting portion 400 provided at both ends of the filter tube can be interference fitted in the receiving chamber 603 to ensure the installation stability of the filter tube, as well as the sealing performance of the filter tube end and the connection, and the oil outlet 401 is communicated with the oil outlet 602. When installing the filter tube, it is also necessary to ensure that there is an oil gap between the outer wall of the filter tube except the first connecting portion 300 and the second connecting portion 400 and the inner wall of the receiving chamber 603. The fuel entering the accommodating chamber 603 from the oil inlet 604 can only flow through the oil outlet 401 to the oil outlet 602 after being filtered by the filter tube, and participate in the subsequent work of the injector. By installing a filter tube in the accommodating chamber 603 of the connector body 600, the accommodating chamber 603 can be used as a pressure storage chamber of the injector body. The filter tube can not only filter the particulate impurities in the fuel, improve the cleanliness of the fuel entering the injector, and effectively reduce the risk of injector performance failure caused by the problem of fuel cleanliness during the operation of the high-pressure common rail system, but also reduce the pressure fluctuation of the fuel in the injector, and more accurately control the multiple injection processes of the high-pressure common rail fuel system. The cleaning and maintenance of the filter tube can be carried out simultaneously with the daily maintenance of the injector body. When there are too many solid impurities filtered out of the connector body 600, the filter tube can be directly taken out for cleaning, which is convenient to operate and improves the practicality of the injector connector.

[0031] Further optimization, in other embodiments of the present application, the oil inlet 604 is located at an end away from the sealing portion 601. The sealing portion 601 is located at the end of the joint body 600, and its main function is to prevent the high-pressure leakage of the fuel in the accommodating cavity 603. The oil inlet 604 is located at the end away from the sealing portion 601. This layout is helpful for setting a filter pipe to filter and purify the fuel. Impurities in the fuel can be effectively blocked or filtered to ensure the cleanliness of the fuel entering the fuel injector.

[0032] Further optimization, in other embodiments of the present application, the sealing part 601 includes a tapered sleeve 6011 and a connecting nut 6012 that abut against each other, wherein the tapered sleeve 6011 matches the inner wall of the accommodating chamber 603 in a taper. The sealing part 601 is located at the end of the joint body 600, and the tapered sleeve 6011 in the sealing part 601 is located at the lower end of the connecting nut 6012, and the tapered sleeve 6011 matches the accommodating chamber 603, so that the outer wall of the tapered sleeve 6011 matches the inner wall of the accommodating chamber 603 in a taper to seal the end of the joint body 600 and prevent the fuel in the accommodating chamber 603 from leaking from the sealed end of the joint body 600. Then, the connecting nut 6012, whose outer wall is provided with threads matching the threads at the inner wall of the end of the accommodating chamber 603, is screwed into the accommodating chamber 603, so that the connecting nut 6012 is fixedly arranged at the upper end of the tapered sleeve 6011, and the lower end of the connecting nut 6012 abuts against the upper end of the tapered sleeve 6011. The sealing part 601 is composed of a tapered sleeve 6011 and a connecting nut 6012, wherein the tapered sleeve 6011 is mainly used to seal the joint body 600, and the connecting nut 6012 is used to fix the tapered sleeve 6011 to prevent the tapered sleeve 6011 from falling off and affecting the sealing effect. The combined sealing part 601 not only ensures the sealing effect, but also facilitates the maintenance and replacement of the joint body 600 because it is detachable relative to the joint body 600, further improving the convenience and practicality of the injector joint.

[0033] Further optimization, in other embodiments of the present application, the inner wall of the tapered sleeve 6011 is also provided with a second sealing surface, the first connecting portion 300 is provided with a first sealing surface, and the first sealing surface abuts against the second sealing surface. The tapered sleeve 6011 is configured as a conical barrel structure with one end open, and its sealing end abuts against the connecting nut 6012, and the outer wall is matched with the inner wall of the accommodating cavity 603 in a tapered manner, and the inner wall is configured as the second sealing surface. The filter screen tube provided in the joint body 600, the first connecting portion 300 located at its end is provided with a first sealing surface. When assembling the injector joint, the first sealing surface is abutted against the second sealing surface, so that a tongue-and-groove connection sealing surface is formed between the filter tube and the tapered sleeve 6011, which is matched with the first convex sealing surface and the second concave sealing surface; not only can the filter tube be fixedly installed in the joint body 600, but also the sealing between the filter tube and the accommodating cavity 603 is ensured, so that the fuel can only pass through the side wall of the filter tube where the filter 200 is provided, avoiding the outflow of unfiltered fuel, thereby ensuring the cleanliness of the fuel flowing into the injector.

[0034] Further optimization, in other embodiments of the present application, a flow limiting valve 700 is further provided in the accommodating chamber 603; wherein one end of the flow limiting valve 700 abuts against the second connecting portion 400, and the other end is communicated with the oil outlet 604. The flow limiting valve 700 is provided at the end of the accommodating chamber 603, one end of the flow limiting valve 700 abuts against the second connecting portion 400 located at the end of the filter screen tube, and the other end is communicated with the oil outlet 604, so that the fuel filtered by the filter screen tube flows out from the oil outlet hole 401, flows through the flow limiting valve 700, and then flows out from the oil outlet 604. The flow limiting valve 700 can limit the fuel flow entering the injector body, and prevent the injector from being damaged or failing due to excessive fuel flow; and the opening of the flow limiting valve 700 is adjusted to control the injection amount of the injector, thereby realizing accurate control of the injection amount of the injector. The flow limiting valve 700 can also keep the fuel pressure in the injector stable, and avoid the occurrence of fuel leakage due to pressure fluctuation or excessive pressure. By arranging the flow limiting valve 700 in the accommodating cavity 603, the practicality of the injector connector is further improved.

[0035] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A filter tube, characterized in that: The invention comprises a bushing (100) of tubular structure, wherein a plurality of oil inlet holes (101) are arranged on the bushing (100), and a filter screen (200) is also arranged on the outer wall of the bushing (100); and further comprises a first connecting portion (300) located at one end of the bushing (100) and a second connecting portion (400) located at the other end of the bushing (100), wherein the second connecting portion (400) is provided with an oil outlet hole (401).

2. A filter screen tube according to claim 1, characterized in that: The first connecting portion (300) and the second connecting portion (400) are both provided with connecting grooves (500), and both ends of the bushing (100) are snap-connected with the connecting grooves (500).

3. A filter screen tube according to claim 2, characterized in that: The connecting groove (500) comprises a positioning wall (501) located on the inner side and a fastening wall (502) located on the outer side, and the fastening wall (502) is made of elastic material.

4. A fuel injector connector, characterized in that: The invention comprises a joint body (600), wherein a sealing portion (601) is provided at one end of the joint body (600), and an oil outlet (602) is provided at the other end, a receiving chamber (603) is provided between the sealing portion (601) and the oil outlet (602), and a filter tube is provided in the receiving chamber (603), wherein the filter tube is the filter tube as claimed in claim 1, 2 or 3; and an oil inlet (604) is provided on the side wall of the joint body (600), and the oil inlet (604) is connected to the receiving chamber (603).

5. A fuel injector connector according to claim 4, characterized in that: The oil inlet (604) is located at an end away from the sealing portion (601).

6. A fuel injector connector according to claim 4 or 5, characterized in that: The sealing portion (601) comprises a tapered sleeve (6011) and a connecting nut (6012) that abut against each other, wherein the tapered sleeve (6011) is taperedly matched with the wall of the accommodating cavity (603).

7. A fuel injector connector according to claim 6, characterized in that: The inner wall of the tapered sleeve (6011) is provided with a second sealing surface, and the first connecting portion (300) is provided with a first sealing surface, and the first sealing surface abuts against the second sealing surface.

8. A fuel injector connector according to claim 4, 5 or 7, characterized in that: A flow limiting valve (700) is also provided in the accommodating cavity (603); one end of the flow limiting valve (700) is in contact with the second connecting portion (400), and the other end is in communication with the oil outlet (602).

9. The fuel injector connector according to claim 6, characterized in that: A flow limiting valve (700) is also provided in the accommodating cavity (603); one end of the flow limiting valve (700) is in contact with the second connecting portion (400), and the other end is in communication with the oil outlet (602).

Images