CN221032897U

CN221032897U - Multi-fuel high-pressure injection valve

Info

Publication number: CN221032897U
Application number: CN202322908645.2U
Authority: CN
Inventors: 汪波; 寇冲; 王志桓; 王念波; 杨宇坤; 周科; 郑石兵; 张重
Original assignee: Chongqing Hongjiang Machinery Co Ltd
Current assignee: Chongqing Hongjiang Machinery Co Ltd
Priority date: 2023-10-30
Filing date: 2023-10-30
Publication date: 2024-05-28
Anticipated expiration: 2033-10-30

Abstract

The utility model belongs to the technical field of internal combustion engines, and particularly discloses a multi-fuel high-pressure injection valve which comprises a valve shell, a guide sleeve, a valve rod, a nozzle and a push rod, wherein a first flow passage is arranged in the push rod; the valve rod is internally provided with a second flow passage, a first fuel cavity is formed by a gap between the groove and the first bulge, two sides of the elastic piece are respectively connected with one side of the installation cavity and the connecting plate, the bottom of the rod part is positioned in the second fuel cavity, the guide sleeve is internally provided with a control oil cavity which can be communicated with the second sliding groove, the second fuel cavity is communicated with the outlet of the guide sleeve, and one end of the valve rod, which is close to the nozzle, can seal the outlet of the second fuel cavity and the guide sleeve. According to the technical scheme, one injection valve can simultaneously inject multiple fuels, so that the mounting holes of special ignition valves on the cylinder are reduced, and the structure of the cylinder cover is more reasonable.

Description

Multi-fuel high-pressure injection valve

Technical Field

The utility model belongs to the technical field of internal combustion engines, and particularly relates to a multi-fuel high-pressure injection valve.

Background

At present, the requirements of the international maritime organization and the like on carbon emission are more severe, various fuel forms appear, and meanwhile, certain fuels cannot be compression-ignited, such as natural gas, methanol and the like, so that a special diesel ignition valve is required to inject a small amount of diesel for ignition, and the cylinder head with compact structure is more difficult to arrange.

The prior art discloses a multi-fuel injector for an internal combustion engine, a method for operating a multi-fuel injector, and an internal combustion engine (CN 107429652B), the multi-fuel injector having a base body in which a nozzle needle is displaceably arranged, which in a first functional position is pressed against a needle seat under pretension, a fluid connection between a collection space and at least one injection opening is blocked by the nozzle needle, which in a second functional position is spaced from the needle seat such that the fluid connection between the collection space and the at least one injection opening is open, the multi-fuel injector having a first inlet opening for a first fuel, which is in fluid connection with the collection space, a control space being arranged above the nozzle needle, which control space is in fluid connection with a second inlet opening for a second fuel under pressure, which control space is pressure-relieved via a controllable valve for displacing the nozzle needle from the first functional position into the second functional position, which nozzle needle is configured as a common valve element for the first and second fuel, which control space is in fluid connection with the collection space via the controllable valve.

According to the technical scheme, two fuels can be injected simultaneously by one injection valve, but in the technical scheme, the valves are independently controlled by pressure relief of the control space and inflow of the second fuel into the accumulation space, so that automatic injection can not be performed, and the intelligent operation is not realized.

Disclosure of utility model

The utility model aims to provide a multi-fuel high-pressure injection valve, which solves the problems that in the prior art, the valve is required to be independently controlled for pressure relief of a control space and inflow of second fuel into an accumulation space in a multi-fuel injector, automatic injection can not be performed, and the intellectualization is not enough.

In order to achieve the above purpose, the technical scheme of the utility model is as follows: the multi-fuel high-pressure injection valve comprises a valve shell, a guide sleeve, a valve rod, a nozzle and a push rod, wherein two sides of the guide sleeve are respectively connected with the valve shell and the nozzle; an installation cavity is formed in the valve housing; the push rod is positioned in the valve shell and is fixed with the top of the valve shell, and a first flow passage for passing a first fuel is arranged in the push rod; the valve rod is internally provided with a second flow passage for passing first fuel, the valve rod comprises a head part and a rod part, the head part of the valve rod comprises a first bulge, a connecting plate and a second bulge which are sequentially arranged, the bottom of the push rod is provided with a groove, the top of the first bulge is slidingly connected in the groove, a first fuel cavity is formed by a gap between the groove and the first bulge, and the first flow passage and the second flow passage are both communicated with the first fuel cavity; the guide sleeve is internally provided with a first chute, a second chute, a third chute and a second fuel cavity in sequence, the connecting plate is connected in the first chute in a sealing and sliding way, a buffer cavity is formed between the connecting plate and the first chute, an elastic piece is arranged in the valve casing and is in a compression state, and two sides of the elastic piece are respectively connected with one side of the installation cavity and the connecting plate; the second bulge is connected in the second chute in a sealing sliding way, the rod part is connected in the third chute in a sealing sliding way, the bottom of the rod part is positioned in the second fuel cavity, and the second fuel cavity is connected with an external second fuel oil way; a control oil cavity which can be communicated with the second sliding groove is arranged in the guide sleeve, and the control oil cavity is communicated with an external control oil circuit; a first check valve for checking the first fuel in the first flow passage is arranged in the push rod, a second check valve is arranged in the second flow passage, and the opening pressure of the second check valve is larger than that of the first check valve; the second fuel cavity is communicated with the outlet of the guide sleeve, and one end of the valve rod, which is close to the nozzle, can plug the outlets of the second fuel cavity and the guide sleeve; the mixing cavity is arranged in the nozzle and can be communicated with an outlet of the guide sleeve.

Further, a bushing is arranged in the third sliding groove, and the rod part is positioned in the bushing and is matched with the bushing by a matching part.

Further, one side of the push rod far away from the valve rod is provided with a first thread section, the valve casing is provided with a threaded hole, and the first thread section is in threaded connection with the threaded hole.

Further, the first thread section is further in threaded connection with a lock nut, the lock nut is located outside the valve housing, and the lock nut can abut against the valve housing.

Further, the push rod is far away from the one end of valve rod be equipped with the mounting groove of first flow channel intercommunication, first check valve is installed in the mounting groove, the tip threaded connection of push rod has the joint, be equipped with first fuel inlet in the joint, first fuel inlet and first check valve intercommunication.

Further, an installation clamping groove is formed in the nozzle, a second thread section is formed in one side, close to the nozzle, of the guide sleeve, one side of the locking sleeve is connected to the second thread section in a threaded mode, and the other side of the locking sleeve is hooked on the installation clamping groove.

Further, the bushing is a wear-resistant bushing.

The working principle of the technical scheme is as follows:

In the period that the engine does not inject, the pretightening force of the elastic piece enables the valve rod to seal the second fuel cavity, and first fuel enters the injection valve through the first check valve, and the first fuel cannot enter the cylinder temporarily because the second check valve has higher opening pressure.

When the engine enters an injection period, high-pressure oil is introduced into the control oil cavity, the high-pressure oil enters the second sliding groove and pushes the second bulge, the valve rod overcomes the elastic force of the elastic piece to move, the end part of the valve rod is separated from the outlet of the guide sleeve, high-pressure second fuel enters the mixing cavity, meanwhile, the first bulge extrudes the first fuel cavity, the first fuel is pressed into the mixing cavity, and the first fuel and the second fuel enter the cylinder for combustion after being mixed. Under the control of the electromagnetic valve, when the control oil cavity is connected with the oil tank, the control oil in the control oil cavity flows out of the second sliding groove, and the valve rod is reset to the sealing position under the elastic action of the elastic piece, so that the injection period is completed.

The beneficial effects of this technical scheme lie in:

(1) In the scheme, the first fuel enters the injection valve through the head in an un-injected state, and the first fuel cannot enter the cylinder under the action of the first check valve. Under the action of the elastic piece, the contact line of the valve rod and the guide sleeve forms a seal, and the second fuel cannot enter the cylinder. When control oil is introduced into the control oil cavity, the valve rod moves upwards against the elasticity of the elastic piece, so that the valve rod is separated from the guide sleeve sealing line, second fuel enters the cylinder under the action of self pressure, the first fuel cavity is extruded while the valve rod moves upwards, and the first fuel is prevented from flowing back by the first check valve, so that the first fuel enters the cylinder against the second check valve, and simultaneous injection of two fuels is completed.

(2) The push rod passes through threaded connection with the valve casing, loosens lock nut, and the push rod can be adjusted from top to bottom, adjusts suitable position according to the engine operating mode, when adjusting the push rod, has adjusted the lift of valve rod and the volume in first fuel chamber for two kinds of fuels can both be according to the perfect cylinder of spouting of demand, can effectually realize the accurate, accurate and the fine control to the internal-combustion engine operating mode.

Drawings

FIG. 1 is a schematic diagram of a multi-fuel high pressure injection valve according to the present utility model.

Detailed Description

The following is a further detailed description of the embodiments:

Reference numerals in the drawings of the specification include: the valve comprises a joint 1, a first check valve 2, a lock nut 3, a push rod 4, an elastic piece 5, a valve shell 6, a valve rod 7, a bushing 8, a guide sleeve 9, a second check valve 10, a lock sleeve 11, a nozzle 12, a first fuel cavity 13, a buffer cavity 14, a control oil cavity 15, a second fuel cavity 16, a mixing cavity 17, a first fuel inlet 18, a first flow channel 19, a second flow channel 20, a mounting cavity 21, a first bulge 22, a second bulge 23 and a connecting plate 24.

The following description of the embodiments of the present utility model will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

An example is substantially as shown in figure 1: the utility model provides a many fuel high pressure injection valve, includes valve casing 6, guide pin bushing 9, valve rod 7, nozzle 12 and push rod 4, and the upper and lower both sides of guide pin bushing 9 are connected with valve casing 6 and nozzle 12 respectively, are equipped with the installation draw-in groove on the nozzle 12, and the downside of guide pin bushing 9 is equipped with the second screw thread section, and the upside threaded connection of lock sleeve 11 is on the second screw thread section, and the downside colludes on the installation draw-in groove. The valve housing 6 is internally provided with an installation cavity 21; the push rod 4 is positioned in the valve housing 6 and fixed with the top of the valve housing 6, and a first flow passage 19 for passing a first fuel is arranged in the push rod 4; specifically, a first thread section is arranged on the upper side of the push rod 4, a threaded hole is formed in the valve housing 6, and the first thread section is in threaded connection with the threaded hole. The first thread segment is further screwed with a lock nut 3, the lock nut 3 being located outside the valve housing 6, the lock nut 3 being able to abut against the upper side of the valve housing 6. The upper end of push rod 4 is equipped with the mounting groove with first flow channel 19 intercommunication, and first check valve 2 is installed in the mounting groove, and the upper end threaded connection of push rod 4 has joint 1, is equipped with first fuel inlet 18 in the joint 1, and first fuel inlet 18 communicates with first check valve 2, and joint 1 compresses tightly first check valve 2.

The valve rod 7 is internally provided with a second flow passage 20 for passing first fuel, the valve rod 7 comprises a head part and a rod part, the head part of the valve rod 7 comprises a first bulge 22, a connecting plate 24 and a second bulge 23 which are sequentially arranged, the bottom of the push rod 4 is provided with a groove, the top of the first bulge 22 is slidably connected in the groove, a gap between the groove and the first bulge 22 forms a first fuel cavity 13, and the first flow passage 19 and the second flow passage 20 are communicated with the first fuel cavity 13. The guide sleeve 9 is internally provided with a first chute, a second chute, a third chute and a second fuel cavity 16 in sequence, the connecting plate 24 is connected in the first chute in a sealing sliding way, and a buffer cavity 14 is formed between the connecting plate 24 and the first chute. An elastic member 5 (specifically, a return spring) is arranged in the valve housing 6, the elastic member 5 is in a compressed state, and the upper side and the lower side of the elastic member 5 are respectively connected with the top of the installation cavity 21 and the connecting plate 24. The second bulge 23 is connected in a sealing sliding manner in the second sliding groove, a bushing 8 (the bushing 8 is a wear-resistant bushing and can be a copper bushing) is arranged in the third sliding groove, the rod part is arranged in the bushing 8 and is matched with the bushing, the bottom of the rod part is arranged in the second fuel cavity 16, and the second fuel cavity 16 is connected with an external second fuel oil way. A control oil cavity 15 which can be communicated with the second chute is arranged in the guide sleeve 9, and the control oil cavity 15 is communicated with an external control oil path. The pushrod 4 is provided with a first check valve 2 for checking the first fuel in the first flow passage 19, and the second flow passage 20 is provided with a second check valve 10, and the opening pressure of the second check valve 10 is larger than that of the first check valve 2. The second fuel cavity 16 is communicated with the outlet of the guide sleeve 9, and one end of the valve rod 7, which is close to the nozzle 12, can seal the outlets of the second fuel cavity 16 and the guide sleeve 9; a mixing chamber 17 is provided in the nozzle 12, the mixing chamber 17 being capable of communicating with the outlet of the guide sleeve 9.

The specific implementation process is as follows:

During periods of engine non-injection, the pre-tightening force of the elastic member 5 causes the valve rod 7 to seal the second fuel chamber 16, the first fuel enters the injection valve interior through the first check valve 2, and the first fuel cannot enter the cylinder temporarily due to the higher opening pressure of the second check valve 10.

When the engine enters an injection period, high-pressure oil is introduced into the control oil cavity 15, the high-pressure oil enters the second sliding groove and pushes the second protrusion 23, the valve rod 7 moves against the elastic force of the elastic piece 5, the lower end part of the valve rod 7 is separated from the outlet of the guide sleeve 9, high-pressure second fuel enters the mixing cavity 17, meanwhile, the first protrusion 22 presses the first fuel cavity 13, the first fuel is pressed into the mixing cavity 17, and the first fuel and the second fuel are mixed and then enter the cylinder for combustion. Under the control of the electromagnetic valve, when the control oil cavity 15 is connected with the oil tank, the control oil in the control oil cavity 15 flows out of the second sliding groove, and the valve rod 7 is reset to the sealing position under the elastic force of the elastic piece 5, so that the injection period is completed.

It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

The foregoing is merely an embodiment of the present utility model, and a specific structure and characteristics of common knowledge in the art, which are well known in the scheme, are not described herein, so that a person of ordinary skill in the art knows all the prior art in the application date or before the priority date, can know all the prior art in the field, and has the capability of applying the conventional experimental means before the date, and a person of ordinary skill in the art can complete and implement the present embodiment in combination with his own capability in the light of the present utility model, and some typical known structures or known methods should not be an obstacle for a person of ordinary skill in the art to implement the present utility model. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present utility model is subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims

1. A multi-fuel high pressure injection valve, characterized by: the valve comprises a valve housing (6), a guide sleeve (9), a valve rod (7), a nozzle (12) and a push rod (4), wherein two sides of the guide sleeve (9) are respectively connected with the valve housing (6) and the nozzle (12); an installation cavity (21) is arranged in the valve casing (6); the push rod (4) is positioned in the valve casing (6) and is fixed with the top of the valve casing (6), and a first flow passage (19) for passing a first fuel is arranged in the push rod (4); the novel fuel valve is characterized in that a second flow passage (20) for passing first fuel is arranged in the valve rod (7), the valve rod (7) comprises a head part and a rod part, the head part of the valve rod (7) comprises a first bulge (22), a connecting plate (24) and a second bulge (23) which are sequentially arranged, a groove is formed in the bottom of the push rod (4), the top of the first bulge (22) is slidably connected in the groove, a first fuel cavity (13) is formed by a gap between the groove and the first bulge (22), and the first flow passage (19) and the second flow passage (20) are both communicated with the first fuel cavity (13); the guide sleeve (9) is internally provided with a first chute, a second chute, a third chute and a second fuel cavity (16) in sequence, the connecting plate (24) is connected in the first chute in a sealing sliding way, a buffer cavity (14) is formed between the connecting plate (24) and the first chute, the valve casing (6) is internally provided with an elastic piece (5), the elastic piece (5) is in a compressed state, and two sides of the elastic piece (5) are respectively connected with one side of the installation cavity (21) and the connecting plate (24); the second bulge (23) is connected in a second chute in a sealing sliding way, the rod part is connected in a third chute in a sealing sliding way, the bottom of the rod part is positioned in the second fuel cavity (16), and the second fuel cavity (16) is connected with an external second fuel oil way; a control oil cavity (15) which can be communicated with the second sliding groove is arranged in the guide sleeve (9), and the control oil cavity (15) is communicated with an external control oil way; a first check valve (2) for checking the first fuel in the first flow passage (19) is arranged in the push rod (4), a second check valve (10) is arranged in the second flow passage (20), and the opening pressure of the second check valve (10) is larger than that of the first check valve (2); the second fuel cavity (16) is communicated with the outlet of the guide sleeve (9), and one end of the valve rod (7) close to the nozzle (12) can plug the outlets of the second fuel cavity (16) and the guide sleeve (9); a mixing cavity (17) is arranged in the nozzle (12), and the mixing cavity (17) can be communicated with an outlet of the guide sleeve (9).

2. A multi-fuel high pressure injection valve according to claim 1, wherein: and a lining (8) is arranged in the third sliding groove, and the rod part is positioned in the lining (8) and is matched with the lining by a matching part.

3. A multi-fuel high pressure injection valve according to claim 1, wherein: one side of the push rod (4) far away from the valve rod (7) is provided with a first thread section, the valve casing (6) is provided with a threaded hole, and the first thread section is in threaded connection with the threaded hole.

4. A multi-fuel high pressure injection valve according to claim 3, wherein: the first thread section is further in threaded connection with a lock nut (3), the lock nut (3) is located outside the valve casing (6), and the lock nut (3) can prop against the valve casing (6).

5. A multi-fuel high pressure injection valve according to claim 3, wherein: the one end that push rod (4) kept away from valve rod (7) is equipped with the mounting groove with first flow channel (19) intercommunication, first check valve (2) are installed in the mounting groove, the tip threaded connection of push rod (4) has joint (1), be equipped with first fuel entry (18) in joint (1), first fuel entry (18) and first check valve (2) intercommunication.

6. A multi-fuel high pressure injection valve according to claim 1, wherein: the nozzle (12) is provided with an installation clamping groove, one side of the guide sleeve (9) close to the nozzle (12) is provided with a second thread section, one side of the locking sleeve (11) is connected to the second thread section in a threaded manner, and the other side of the locking sleeve is hooked on the installation clamping groove.

7. A multi-fuel high pressure injection valve according to claim 2, wherein: the bushing (8) is a wear-resistant bushing (8).