Natural gas engine intake manifold

Abstract

The utility model discloses a natural gas engine intake manifold which comprises an intake pipe, the lower end of the intake pipe is sequentially communicated with a connecting pipe and a corrugated pipe, a cylinder body connecting plate is welded at the bottom of the corrugated pipe, and the intake manifold is composed of the intake pipe, the connecting pipe and the corrugated pipe. A natural gas nozzle inserting hole is formed in the gas inlet pipe, and a natural gas nozzle mounting piece is arranged on the outer side of the natural gas nozzle inserting hole; the device further comprises a mixing assembly for mixing air and natural gas, and the mixing assembly is installed in the connecting pipe. A sealing assembly is arranged between the connecting pipe and the air inlet pipe; a fastening assembly is further arranged between the connecting pipe and the air inlet pipe. Natural gas is mixed with air in a mode that the natural gas is sprayed into the intake manifold, the natural gas and the air are fully mixed under the action of the mixing assembly, uniform mixing of the natural gas and the air is facilitated, full combustion of the natural gas is facilitated, sealing performance is improved, and meanwhile fastening, dismounting and mounting of the connecting pipe are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of intake manifolds, and particularly relates to an intake manifold for a natural gas engine. Background Technique

[0002] Natural gas engines are now widely used. For example, the prior art publication (announcement) number: CN203939591, publication (announcement) date: November 12, 2014, discloses an intake manifold for a natural gas engine based on a diesel engine, including an intake manifold for the first cylinder, an intake manifold for the second cylinder, an intake manifold for the third cylinder, an intake manifold for the fourth cylinder, an intake manifold for the fifth cylinder, an intake manifold for the sixth cylinder, a pressure stabilizing mixing chamber, a spreading mixer, an electronic control throttle valve, a high-pressure transfer pipe, and a high-pressure transfer pipe pressing plate. The intake manifold for the first cylinder, the intake manifold for the second cylinder, the intake manifold for the third cylinder, the intake manifold for the fourth cylinder, the intake manifold for the fifth cylinder, and the intake manifold for the sixth cylinder are evenly installed below the pressure stabilizing mixing chamber. The spreading mixer, the electronic control throttle valve, the high-pressure transfer pipe, and the high-pressure transfer pipe pressing plate are sequentially connected and then installed at the upper end of the pressure stabilizing mixing chamber. Through experimental verification, the utility model effectively improves the low-speed torque of the engine, improves the combustion efficiency, and reduces the gas consumption; the utility model has the advantages of simple structure, stable performance, and long service life.

[0003] However, this engine adopts the in-cylinder direct injection method, and the intake manifold only has a simple intake function, which is not conducive to the full mixing of natural gas and air. If the manifold injection method is adopted, there is a lack of a mixing mechanism inside the intake manifold, which is also not conducive to the mixing of air and natural gas, and there are certain defects.

[0004] Therefore, it is necessary to newly design an intake manifold for a natural gas engine. Content of the Utility Model

[0005] The purpose of the utility model is to provide an intake manifold for a natural gas engine to solve the problems put forward in the above background technique.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] An intake manifold for a natural gas engine includes an intake pipe. The top end of the intake pipe is communicated with a pressure stabilizing chamber. The lower end of the intake pipe is sequentially communicated with a connecting pipe and a corrugated pipe. The bottom of the corrugated pipe is welded with a cylinder block connecting plate. The intake manifold is composed of the intake pipe, the connecting pipe, and the corrugated pipe. A natural gas nozzle insertion hole is opened on the intake pipe, and a natural gas nozzle mounting part is arranged outside the natural gas nozzle insertion hole. It further includes a mixing assembly for mixing air and natural gas, and the mixing assembly is installed inside the connecting pipe. A sealing assembly is arranged between the connecting pipe and the intake pipe. A fastening assembly is also arranged between the connecting pipe and the intake pipe.

[0008] Preferably, the above-mentioned mixing assembly includes a plurality of upwardly convex arc-shaped sheets and downwardly convex annular sheets, the arc-shaped sheets and the annular sheets are arranged alternately up and down, a first connecting rod is welded between the arc-shaped sheets and the annular sheets, and a second connecting rod is welded between the two annular sheets. The annular sheet abuts against the inner wall of the connecting pipe.

[0009] Preferably, a limiting annular plate is welded to the inner wall of the bottom of the above-mentioned connecting pipe, the lowermost annular sheet is pressed above the limiting annular plate, and the uppermost annular sheet abuts against the bottom of the intake pipe.

[0010] Preferably, the above-mentioned sealing assembly includes a first sealing ring and a second sealing ring. An annular groove is formed at the bottom of the intake pipe. The first sealing ring is located inside the annular groove, and the top of the connecting pipe is inserted into the annular groove. An annular plate is welded to the outer wall of the connecting pipe, and the second sealing ring is sleeved outside the connecting pipe and is located between the top of the annular plate and the bottom of the intake pipe.

[0011] Preferably, a first convex ring is integrally formed at the top of the above-mentioned connecting pipe, and a second convex ring is integrally formed at the top of the annular plate.

[0012] Preferably, the above-mentioned fastening assembly includes a screw pipe with opposite helical directions inside the inner wall. First connecting plates are welded to the outer walls of the left and right sides of the bottom of the intake pipe, and first screw rods are welded to the bottoms of the first connecting plates. Second connecting plates are welded to the outer walls of the left and right sides of the connecting pipe, and second screw rods are welded to the tops of the second connecting plates. The first screw rod and the second screw rod are both screwed inside the screw pipe.

[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0014] For this natural gas engine intake manifold, the method of injecting natural gas into the intake manifold is adopted to mix natural gas and air. Through the action of the mixing assembly, natural gas and air are fully mixed, which is beneficial to the uniform mixing of natural gas and air, beneficial to the full combustion of natural gas, improves the sealing performance, and facilitates the fastening, disassembly and assembly of the connecting pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is the main view sectional view of the structure of the present utility model;

[0016] Figure 2 It is the schematic structural view of the mixing assembly of the structure of the present utility model;

[0017] Figure 3 It is the enlarged view of part A in the main view sectional view of the structure of the present utility model;

[0018] Figure 4Schematic diagram of the half-section structure of the connecting pipe of the structure of the present utility model;

[0019] Figure 5 Schematic diagram of the structure of the connecting pipe of the structure of the present utility model.

[0020] In the figure: 100, pressure stabilizing chamber; 200, intake manifold; 210, intake pipe; 211, natural gas nozzle insertion hole; 212, natural gas nozzle mounting member; 220, connecting pipe; 221, first convex ring; 2211, first sealing ring; 222, annular plate; 223, second convex ring; 2231, second sealing ring; 224, limiting annular plate; 230, bellows; 231, cylinder body connecting plate; 240, screw pipe; 241, first screw; 242, second screw; 243, first connecting plate; 244, second connecting plate; 250, mixing assembly; 251, arc-shaped piece; 252, annular piece; 253, first connecting rod; 254, second connecting rod. Specific embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] The same or similar components are labeled with the same reference numerals in different drawings; in addition, please understand that terms such as "first", "second", "third", "upper", "lower", "front", "rear", "inner", "outer", "end", "portion", "section", "width", "thickness", "area", etc. in the text are only for the convenience of the viewer to refer to the structure in the drawings and are only used to help describe the present utility model, and are not limitations to the present utility model.

[0023] Please refer to Figures 1-5 , a natural gas engine intake manifold, including an intake pipe 210, the top of the intake pipe 210 is communicated with a pressure stabilizing chamber 100, the lower end of the intake pipe 210 is sequentially communicated with a connecting pipe 220 and a bellows 230, the bottom of the bellows 230 is welded with a cylinder body connecting plate 231, and the intake manifold 200 is composed of the intake pipe 210, the connecting pipe 220 and the bellows 230; a natural gas nozzle insertion hole 211 is opened on the intake pipe 210, and a natural gas nozzle mounting member 212 is arranged outside the natural gas nozzle insertion hole 211; it further includes a mixing assembly 250 for mixing air and natural gas, and the mixing assembly 250 is installed inside the connecting pipe 220; a sealing assembly is arranged between the connecting pipe 220 and the intake pipe 210; a fastening assembly is also arranged between the connecting pipe 220 and the intake pipe 210.

[0024] With the above design, the natural gas nozzle is directly inserted into the interior of the intake pipe 210. By adopting the method of injecting natural gas inside the intake manifold, the natural gas is mixed with air. Through the action of the mixing assembly 250, the natural gas and air are fully mixed, which is conducive to the uniform mixing of natural gas and air and the full combustion of natural gas.

[0025] Further, the mixing assembly 250 includes a plurality of upwardly convex arc-shaped pieces 251 and downwardly convex annular pieces 252. The arc-shaped pieces 251 and the annular pieces 252 are arranged in an alternating up-and-down manner. A first connecting rod 253 is welded between the arc-shaped piece 251 and the annular piece 252, and a second connecting rod 254 is welded between two annular pieces 252. The annular piece 252 abuts against the inner wall of the connecting pipe 220. With the above design, the natural gas and air shuttle between the arc-shaped piece 251 and the annular piece 252, which is conducive to the full mixing of natural gas and air.

[0026] Further, a limiting annular plate 224 is welded to the bottom inner wall of the connecting pipe 220. The lowermost annular piece 252 is pressed above the limiting annular plate 224, and the uppermost annular piece 252 abuts against the bottom of the intake pipe 210. With the above design, the stability of the mixing assembly 250 is improved.

[0027] Further, the sealing assembly includes a first sealing ring 2211 and a second sealing ring 2231. An annular groove is formed at the bottom of the intake pipe 210. The first sealing ring 2211 is located inside the annular groove, and the top of the connecting pipe 220 is inserted into the annular groove; an annular plate 222 is welded to the outer wall of the connecting pipe 220. The second sealing ring 2231 is sleeved outside the connecting pipe 220 and is located between the top of the annular plate 222 and the bottom of the intake pipe 210. With the above design, through the combined action of the first sealing ring 2211 and the second sealing ring 2231, the sealing performance between the connecting pipe 220 and the intake pipe 210 is improved.

[0028] Further, a first convex ring 221 is integrally formed at the top of the connecting pipe 220, and a second convex ring 223 is integrally formed at the top of the annular plate 222. With the above design, the sealing performance between the connecting pipe 220 and the intake pipe 210 is further improved.

[0029] Further, the fastening assembly includes a screw tube 240. The inner wall of the screw tube 240 has opposite screw directions up and down. First connecting plates 243 are welded to the outer walls on the left and right sides of the bottom of the intake pipe 210. First screw rods 241 are welded to the bottoms of the first connecting plates 243. Second connecting plates 244 are welded to the outer walls on the left and right sides of the connecting pipe 220. Second screw rods 242 are welded to the tops of the second connecting plates 244. The first screw rods 241 and the second screw rods 242 are both screwed inside the screw tube 240. With the above design, by clockwise twisting the screw tube 240, the first screw rods 241 and the second screw rods 242 move into the screw tube 240 to fasten the intake pipe 210 and the connecting pipe 220. By counterclockwise twisting the screw tube 240, the first screw rods 241 and the second screw rods 242 move outwards, facilitating the disassembly of the connecting pipe 220.

[0030] It should be noted that the intake manifold 200 adopts the manifold injection method of injecting natural gas into the intake manifold. It can be directly used in conjunction with an engine or in conjunction with an existing engine with direct injection into the cylinder. Combining the direct injection into the cylinder and the injection of natural gas into the intake manifold enables the engine to output strong power.

[0031] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A natural gas engine intake manifold, comprising an intake pipe, the top end of which is connected to a pressure stabilizing chamber, characterized in that: The lower end of the intake pipe is connected with a connecting pipe and a bellows in sequence, and a cylinder connecting plate is welded to the bottom of the bellows. The intake pipe, the connecting pipe and the bellows form an intake manifold; The air inlet pipe is provided with a natural gas nozzle insertion hole, and a natural gas nozzle mounting piece is provided on the outer side of the natural gas nozzle insertion hole; Also included is a mixing assembly for mixing air and natural gas, wherein the mixing assembly is installed inside the connecting pipe; A sealing component is provided between the connecting pipe and the air intake pipe; A fastening assembly is also provided between the connecting pipe and the air intake pipe.

2. A natural gas engine intake manifold according to claim 1, characterized in that: The mixing assembly includes a plurality of arcuate sheets protruding upward and annular sheets protruding downward, the arcuate sheets and the annular sheets are arranged alternately up and down, a first connecting rod is welded between the arcuate sheets and the annular sheets, a second connecting rod is welded between two annular sheets, and the annular sheets are against the inner wall of the connecting pipe.

3. A natural gas engine intake manifold according to claim 2, characterized in that: A limiting annular plate is welded to the inner wall of the bottom of the connecting pipe, the lowest annular plate is pressed above the limiting annular plate, and the uppermost annular plate abuts against the bottom of the air inlet pipe.

4. A natural gas engine intake manifold according to claim 1, characterized in that: The sealing assembly comprises a first sealing ring and a second sealing ring. An annular groove is provided at the bottom of the air inlet pipe. The first sealing ring is located inside the annular groove. The top of the connecting pipe is inserted into the annular groove. An annular plate is welded to the outer wall of the connecting pipe, and the second sealing ring is sleeved on the outside of the connecting pipe and is located between the top of the annular plate and the bottom of the air inlet pipe.

5. A natural gas engine intake manifold according to claim 4, characterized in that: A first convex ring is integrally formed on the top of the connecting pipe; A second convex ring is integrally formed on the top of the annular plate.

6. A natural gas engine intake manifold according to claim 1, characterized in that: The fastening assembly includes a spiral tube, the inner wall of which is screwed upward and downward in opposite directions, a first connecting plate is welded to the left and right outer walls of the bottom of the intake pipe, a first screw is welded to the bottom of the first connecting plate, a second connecting plate is welded to the left and right outer walls of the connecting pipe, a second screw is welded to the top of the second connecting plate, and the first screw and the second screw are both screwed to the inside of the spiral tube.

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