CN210889146U

CN210889146U - Gas injection valve

Info

Publication number: CN210889146U
Application number: CN201921848385.1U
Authority: CN
Inventors: 付立洲; 杨丽; 文李明; 王慧珺
Original assignee: China Shipbuilding Power Engineering Institute Co Ltd
Current assignee: China Shipbuilding Power Engineering Institute Co Ltd
Priority date: 2019-10-30
Filing date: 2019-10-30
Publication date: 2020-06-30
Anticipated expiration: 2029-10-30

Abstract

The utility model relates to a gas valve engineering technical field discloses a gas injection valve. The fuel gas injection valve comprises a valve body, wherein the front end of the valve body is provided with a gas transmission hole, and the fuel gas injection valve is characterized by further comprising an air injection assembly and an air blowing channel, wherein the air injection assembly comprises a nozzle and a fastening piece, the nozzle is fixed on the valve body through the fastening piece, a cavity is arranged in the fastening piece, and the joint of the nozzle and the valve body is positioned in the cavity; the blowing channel is communicated with the cavity and used for blowing the fuel gas leaked at the joint. The utility model discloses a sweep the effect of revealing the gas in real time, security and practicality that improve equipment used.

Description

Gas injection valve

Technical Field

The utility model relates to a gas engine engineering technical field especially relates to a gas injection valve.

Background

With the continuous development of global economy, the energy demand of people is continuously increased, and the current worldwide oil shortage and the increasing prominence of global environmental pollution problems lead each country to look at gas machines and double fuel machines which take gas as fuel. The gas injection valve, as a direct control element for the injection of gaseous fuel, is undoubtedly one of the most central parts of gas machines and dual fuel machines. The high-pressure gas injection valve in the gas engine and the dual-fuel engine has the advantages that continuous and stable high-pressure gas is provided for the operation of the engine, the existing high-pressure gas injection valve only has a single injection function, the phenomenon of gas leakage frequently occurs due to the fact that the gas is high-pressure inside the existing high-pressure gas injection valve, when the gas is leaked too much from a gas pipeline inside the valve body, the concentration inside the valve body exceeds a safety value, the gas is easy to ignite and explode, the cylinder explosion phenomenon can occur in the gas injection valve, and danger is easy to occur.

Based on this, there is a need for a gas injection valve to solve the above existing problems.

SUMMERY OF THE UTILITY MODEL

Based on above, an object of the utility model is to provide a gas injection valve has realized sweeping in real time and has revealed the effect of gas, security and the practicality that improve equipment used.

In order to achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a gas injection valve, includes the valve body, the front end of valve body is equipped with the gas transmission hole, still includes:

the air injection assembly comprises a nozzle and a fastener, the nozzle is fixed on the valve body through the fastener, a cavity is arranged in the fastener, and the connection position of the nozzle and the valve body is positioned in the cavity;

and the blowing channel is communicated with the cavity and is used for blowing the fuel gas leaked at the joint.

Preferably, the gas injection valve further comprises a needle valve, the valve body is provided with a first accommodating cavity, and the needle valve is arranged in the first accommodating cavity in a sliding and sealing mode;

the needle valve is provided with a second accommodating cavity, the front end of the guide rod is arranged in the second accommodating cavity in a sliding and sealing mode, and an air conveying channel is arranged on the guide rod along the length direction of the guide rod;

the front end of the needle valve is provided with a communicating hole communicated with the second accommodating cavity, and the communicating hole can be communicated with the gas transmission channel and the gas transmission hole.

Preferably, the front end of the needle valve is provided with a boss, one end of the communicating hole, which is far away from the second accommodating cavity, is located on the part, which is not provided with the boss, of the front end surface of the needle valve, the front end of the boss is provided with a conical part, one end, which is close to the boss, of the gas transmission hole is provided with a conical hole matched with the conical part, and the conical part can stretch into the conical hole to block the gas transmission hole.

Preferably, still include the elastic component, the guide bar is including the seat portion and the body of rod portion that are connected, body of rod portion stretch into in the valve body, the laminating of seat portion just is fixed in on the valve body, the both ends of elastic component support respectively press in the needle valve with seat portion, the elastic component can order about the toper portion stretch into in the bell mouth, in order to the shutoff gas transmission hole.

Preferably, the tail end of the needle valve is annularly provided with a stop bulge, and the elastic piece is pressed against the stop bulge.

Preferably, still include servo oil circuit, first chamber that holds includes that the first section and the second that holds that sets gradually hold the section, the first internal diameter that holds the section is less than the second holds the internal diameter of section, first section that holds is located and is close to the one end of gas transmission hole, be provided with on the needle valve with the second holds the step that the section matches, servo oil circuit communicate in first section that holds with the second holds the stair face department between the section, it has high-pressure liquid or gas to lead to in the servo oil circuit, the drive the needle valve is to keeping away from the direction of gas transmission hole removes, with the intercommunication gas transmission passageway with the gas transmission hole.

Preferably, the gas injection valve further comprises a sealing oil path, an oil through hole is formed in the side wall of the needle valve, an annular groove communicated with the oil through hole is formed in the side wall of the second accommodating cavity, and the sealing oil path is communicated with the oil through hole.

Preferably, the gas injection valve further includes a pressure-stabilizing oil path, the first accommodating cavity further includes a third accommodating section, the third accommodating section is located at one end, far away from the first accommodating section, of the second accommodating section, the inner diameter of the second accommodating section is smaller than that of the third accommodating section, the elastic member is located in the third accommodating section, and the pressure-stabilizing oil path is communicated with the third accommodating section.

Preferably, the servo oil path is partially arranged on the valve body, and the other part of the servo oil path is arranged on the seat body part; the blowing channel part is arranged on the valve body, and the other part of the blowing channel part is arranged on the seat body part; the sealing oil path is partially arranged on the valve body, and the other part of the sealing oil path is arranged on the seat body.

Preferably, a first sealing ring and a second sealing ring are arranged between the valve body and the seat body, the first sealing ring is located at the servo oil path, and the second sealing ring is located at the sealing oil path.

The utility model has the advantages that:

the gas injection valve in this embodiment includes valve body, jet-propelled subassembly and the passageway of blowing, and the front end of valve body is equipped with the gas transmission hole, and the jet-propelled subassembly includes nozzle and fastener, and the nozzle passes through fastener fixed connection with the front end of valve body, is provided with the cavity in the fastener, and the nozzle is located the cavity with the position of being connected of valve body. The blowing channel is communicated with the cavity, and the fastening piece not only has the function of fixing the nozzle on the valve body, but also has the function of blowing the leaking gas at the connecting position. In the gas conveying process of the gas injection valve, the gas blowing channel can blow the leaked gas at the connecting position, so that the use safety of the gas injection valve is ensured. The utility model provides a problem of traditional gas injection valve function singleness, realized that the gas injection valve sweeps the effect of revealing the gas in real time, security and the practicality that improve equipment used.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.

FIG. 1 is a structural diagram of a gas injection valve according to an embodiment of the present invention;

FIG. 2 is a front cross-sectional view of a needle valve of a gas injection valve in a closed state according to an embodiment of the present invention;

fig. 3 is a front cross-sectional view of a valve body of a gas injection valve according to an embodiment of the present invention;

fig. 4 is a left side sectional view showing an open state of a needle valve of a gas injection valve according to an embodiment of the present invention.

The figures are labeled as follows:

1-a valve body; 11-gas transmission hole; 12-a first containing cavity; 121-a first containment section; 122-a second containment section; 123-a third containment section;

2-a gas injection assembly; 21-a nozzle; 211-gas injection holes; 22-a fastener;

3-needle valve; 31-a communicating hole; 32-step; 33-oil through holes; 34-a boss; 35-a stop projection;

4-a guide rod; 41-gas transmission channel; 42-a seat body portion; 43-a shaft portion;

5-an elastic member; 6-servo oil circuit; 7-a blowing channel; 8-sealing the oil way; 9-pressure stabilizing oil way.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, detachably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used in the orientation or positional relationship shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

As shown in fig. 1 and 2, the utility model provides a gas injection valve, gas injection valve include valve body 1, jet-propelled subassembly 2 and gas channel 7 of blowing, the front end of valve body 1 is equipped with gas transmission hole 11, jet-propelled subassembly 2 includes nozzle 21 and fastener 22, be equipped with fumarole 211 on the nozzle 21, fumarole 211 is linked together with gas transmission hole 11, and the front end of nozzle 21 and valve body 1 passes through fastener 22 fixed connection, be provided with the cavity in the fastener 22, the nozzle 21 is located the cavity with the hookup location of valve body 1. The blowing channel 7 penetrates through the gas injection valve along the length direction of the gas injection valve and is communicated with the cavity, and the fastening piece 22 not only has the function of fixing the nozzle 21 on the valve body 1, but also has the function of enabling the blowing channel 7 to blow and sweep leaked gas at a connection position. In the gas conveying process of the gas injection valve, the gas blowing channel 7 can blow and sweep gas leaked at the gas connecting position, so that the use safety of the gas injection valve is ensured. The utility model provides a problem of traditional gas injection valve function singleness, realized that the gas injection valve sweeps the effect of revealing the gas in real time, security and the practicality that improve equipment used.

Specifically, the gas injection valve further includes a guide rod 4, the guide rod 4 includes a seat portion 42 and a rod portion 43 that are connected to each other and integrally formed, the rod portion 43 extends into the valve body 1, and the seat portion 42 is attached to and fixed on the valve body 1, and more specifically, is fixed on the valve body 1 by screws in this embodiment. The air blowing passage 7 is partially provided on the side wall of the valve body 1 in the longitudinal direction of the valve body 1 and communicates with the chamber, and is partially provided on the side wall of the seat portion 42 in the longitudinal direction of the guide rod 4.

The guide rod 4 is also provided with a connecting hole, the connecting hole replaces a cylinder cover in the prior art and is connected with an external gas pipeline, the gas pipeline is often in a double-arm pipe structure, the gas blowing channel 7 is communicated with an outer annular wall pipe of the double-arm pipe structure to convey air, gas leaked in a cavity in a connecting position gap and a gas injection valve is blown, and the use safety of equipment is improved. Meanwhile, the gas injection valves of the cylinder cover are reduced, so that the processing difficulty is reduced, and the processing and sealing cost of the cylinder cover is reduced. The high-pressure fuel gas injection valve is modularized and integrated, and the high-pressure fuel gas injection module is convenient to maintain and upgrade.

Further, the gas injection valve further comprises a needle valve 3, a first accommodating cavity 12 is formed in the valve body 1, and the needle valve 3 is arranged in the first accommodating cavity 12 in a sliding and sealing mode. A second accommodating cavity is formed in the needle valve 3, and the front end of the guide rod 4 (i.e., the end of the rod body 43 away from the seat body 42) is slidably and hermetically arranged in the second accommodating cavity. The guide rod 4 is provided with a gas transmission channel 41 along the length direction, and the guide rod 4 not only has a guide function, but also has a function of transmitting gas. The front end of the needle valve 3 is provided with a communication hole 31 communicated with the second accommodating cavity, and the communication hole 31 can be communicated with the gas transmission channel 41 and the gas transmission hole 11 for transmitting gas.

Further, as shown in fig. 2 and fig. 3, in order to realize the blocking of the needle valve 3 for the gas transportation, a boss 34 is provided at the front end of the needle valve 3, one end of the communication hole 31 far away from the second accommodating chamber is located on a part of the front end surface of the needle valve 3 where the boss 34 is not provided, a tapered portion is provided at the front end of the boss 34, a tapered hole matched with the tapered portion is provided at one end of the gas transportation hole 11 near the boss 34, and the tapered portion can extend into the tapered hole to block the gas transportation hole 11. A cone valve is formed between the conical part and the conical hole, and when the boss 34 blocks the air delivery hole 11, the sealing performance between the boss 34 and the air delivery hole 11 is improved through the cone valve structure.

Preferably, the gas injection valve further includes an elastic member 5, in this embodiment, the elastic member 5 is preferably of a spring structure, the rod portion 43 is sleeved with the elastic member 5, two ends of the elastic member 5 respectively abut against the needle valve 3 and the seat portion 42, and the elastic member 5 can drive the tapered portion to extend into the tapered hole to block the gas transmission hole 11. Specifically, the tail end of the needle valve 3 is annularly provided with a stop protrusion 35, the stop protrusion 35 has a limiting effect on the needle valve 3, and the elastic member 5 abuts against the stop protrusion 35. Further preferably, a third sealing ring is provided between the seat body 42 and the valve body 1, so as to seal the seat body 42 and the valve body 1.

In particular, in order to make the boss 34 of the needle valve 3 in the gas injection valve separate from the gas transmission hole 11 and communicate with the gas transmission channel, the gas injection valve further comprises a servo oil path 6. The first accommodating cavity 12 comprises a first accommodating section 121, a second accommodating section 122 and a third accommodating section 123 which are coaxial and sequentially arranged, the inner diameter of the first accommodating section 121 is smaller than that of the second accommodating section 122, the first accommodating section 121 is located at one end close to the gas transmission hole 11, the third accommodating section 123 is located at one end, far away from the first accommodating section 121, of the second accommodating section 122, and the inner diameter of the second accommodating section 122 is smaller than that of the third accommodating section 123. The needle valve 3 is provided with a step 32 matched with the second accommodating section 122, a part of the servo oil path 6 is arranged on the side wall of the valve body 1 and communicated with the stepped surface between the first accommodating section 121 and the second accommodating section 122, and the other part of the servo oil path is arranged on the side wall of the seat body part 42 and communicated with an external oil supply device. And between valve body 1 and seat body portion 42, servo oil circuit 6 is equipped with first sealing washer, realizes the sealed of servo oil circuit 6 between valve body 1 and seat body portion 42. The servo oil path 6 is communicated with the stepped surface between the first accommodating section 121 and the second accommodating section 122, high-pressure liquid or gas, preferably high-pressure liquid in the embodiment, is communicated in the servo oil path 6, and the high-pressure liquid drives the needle valve 3 to move in the direction away from the gas transmission hole 11 so as to communicate the gas transmission channel 41 and the gas transmission hole 11, thereby completing the gas transmission.

Preferably, as shown in fig. 4, it is difficult to ensure that high-pressure gas does not leak from the side wall between the needle valve 3 and the guide rod 4 due to machining errors, high gas pressure, and the like, and therefore, in order to prevent gas leakage, the gas injection valve further includes a sealing oil passage 8. The side wall of the needle valve 3 is provided with an oil through hole 33, the side wall of the second accommodating cavity is provided with an annular groove communicated with the oil through hole 33, and the sealing oil path 8 is communicated with the oil through hole 33. An annular groove communicating with the oil passing hole 33 is also provided on the side wall of the first accommodation chamber 12. When the gas valve is in a working state, the side wall of the second accommodating cavity and the annular groove in the side wall of the first accommodating cavity 12 are filled with liquid, the liquid blocks the gap, gas cannot leak from the gap, and the use safety of the gas valve is improved. Specifically, the sealed oil path 8 is partially provided in the side wall of the valve body 1 and communicates with the oil passing hole 33, and is partially provided in the side wall of the seat portion 42 to communicate with an external oil supply device. And between valve body 1 and seat body portion 42, sealed oil circuit 8 is equipped with the second sealing washer, realizes sealed oil circuit 8 between valve body 1 and seat body portion 42 sealed.

Preferably, since the needle valve 3 is slidably connected to the valve body 1 and the liquid in the servo oil path 6 is usually under a high pressure, after the gas injection valve is used for a period of time, the needle valve 3 and the valve body 1 are worn, and it is difficult to ensure that the high-pressure liquid in the servo oil path 6 does not overflow from between the needle valve 3 and the valve body 1, so the gas injection valve further comprises a pressure-stabilizing oil path 9. The elastic member 5 is located in the third accommodating section 123, and the pressure-stabilizing oil passage 9 is communicated with the third accommodating section 123. The pressure stabilizing oil path 9 is used for providing stable oil pressure for the third accommodating section 123, preventing high-pressure liquid from overflowing, and prolonging the service life of the gas injection valve to slow down abrasion. Specifically, the pressure-stabilizing oil path 9 is disposed on the side wall of the guide rod seat, and has one end communicated with the third accommodating section 123 and the other end communicated with the oil supply device.

It should be particularly noted that the utility model provides a gas injection valve's gas is carried concrete theory of operation as follows:

when the gas injection valve works, the oil supply device conveys high-pressure liquid to the step surface of the step hole through the servo oil circuit 6, the oil pressure at the bottom of the step 32 of the needle valve 3 is improved, at the moment, the liquid pressure at the bottom of the step 32 is larger than the elastic force of the spring part, the needle valve 3 moves towards the direction far away from the gas transmission hole 11, the boss 34 is far away from the gas transmission hole 11, the gas transmission channel 41 is communicated with the gas transmission hole 11 to form a gas passage, and gas flows out from the gas injection hole 211 of the nozzle 21. In the process, the sealing oil path 8, the blowing channel 7 and the pressure stabilizing oil path 9 are all in working states.

When the gas injection valve needs to stop working, the oil supply device communicated with the servo oil path 6 stops working, low-pressure oil return is carried out, and liquid at the bottom of the step 32 of the needle valve 3 flows out through the servo oil path 6 to be decompressed. At this time, the liquid pressure at the bottom of the step 32 of the needle valve 3 is smaller than the elastic force of the elastic member 5, so that the needle valve 3 falls back, and the boss 34 partially extends into the gas transmission hole 11 to block the gas transmission hole 11, and the gas transmission channel is closed.

It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments illustrated herein, but is capable of various obvious modifications, rearrangements and substitutions without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.

Claims

1. The utility model provides a gas injection valve, includes valve body (1), the front end of valve body (1) is equipped with gas transmission hole (11), its characterized in that still includes:

the air injection assembly (2) comprises a nozzle (21) and a fastening piece (22), the nozzle (21) is fixed on the valve body (1) through the fastening piece (22), a cavity is arranged in the fastening piece (22), and the connection part of the nozzle (21) and the valve body (1) is positioned in the cavity;

and the blowing channel (7) is communicated with the cavity, and the blowing channel (7) is used for blowing the gas leaked at the joint.

2. Gas injection valve according to claim 1, further comprising a needle valve (3), a first housing chamber (12) being provided in the valve body (1), the needle valve (3) being slidably and sealingly arranged in the first housing chamber (12);

the needle valve (3) is internally provided with a second accommodating cavity, the front end of the guide rod (4) is arranged in the second accommodating cavity in a sliding and sealing mode, and the guide rod (4) is provided with a gas transmission channel (41) along the length direction of the guide rod;

the front end of the needle valve (3) is provided with a communicating hole (31) communicated with the second accommodating cavity, and the communicating hole (31) can be communicated with the gas transmission channel (41) and the gas transmission hole (11).

3. The gas injection valve according to claim 2, wherein a boss (34) is provided at the front end of the needle valve (3), one end of the communication hole (31) far away from the second accommodating chamber is located on a portion of the front end surface of the needle valve (3) where the boss (34) is not provided, a tapered portion is provided at the front end of the boss (34), a tapered hole matched with the tapered portion is provided at one end of the gas delivery hole (11) close to the boss (34), and the tapered portion can extend into the tapered hole to block the gas delivery hole (11).

4. The gas injection valve according to claim 3, further comprising an elastic member (5), wherein the guide rod (4) comprises a seat portion (42) and a rod portion (43) which are connected, the rod portion (43) extends into the valve body (1), the seat portion (42) is attached to and fixed on the valve body (1), two ends of the elastic member (5) respectively abut against the needle valve (3) and the seat portion (42), and the elastic member (5) can drive the tapered portion to extend into the tapered hole to block the gas transmission hole (11).

5. The gas injection valve according to claim 4, characterized in that the rear end of the needle valve (3) is provided with a stop protrusion (35) in a ring shape, and the elastic member (5) is pressed against the stop protrusion (35).

6. Gas injection valve according to claim 4, further comprising a servo oil circuit (6), the first containing cavity (12) comprises a first containing section (121) and a second containing section (122) which are coaxial and arranged in sequence, the inner diameter of the first accommodation section (121) is smaller than the inner diameter of the second accommodation section (122), the first containing section (121) is positioned at one end close to the air delivery hole (11), the needle valve (3) is provided with a step (32) matched with the second containing section (122), the servo oil path (6) is communicated with a stepped surface between the first accommodating section (121) and the second accommodating section (122), high-pressure liquid or gas is introduced into the servo oil circuit (6) to drive the needle valve (3) to move towards the direction far away from the gas transmission hole (11) so as to communicate the gas transmission channel (41) with the gas transmission hole (11).

7. The gas injection valve according to claim 6, further comprising a sealing oil path (8), wherein an oil through hole (33) is provided in a side wall of the needle valve (3), an annular groove communicating with the oil through hole (33) is provided in a side wall of the second receiving chamber, and the sealing oil path (8) communicates with the oil through hole (33).

8. The gas injection valve according to claim 6, further comprising a pressure stabilizing oil passage (9), wherein the first accommodating cavity (12) further comprises a third accommodating section (123), the third accommodating section (123) is located at one end of the second accommodating section (122) far away from the first accommodating section (121), the inner diameter of the second accommodating section (122) is smaller than that of the third accommodating section (123), the elastic member (5) is located in the third accommodating section (123), and the pressure stabilizing oil passage (9) is communicated with the third accommodating section (123).

9. Gas injection valve according to claim 7, wherein said servo oil circuit (6) is partially arranged on said valve body (1) and partially on said seat portion (42);

the blowing channel (7) is partially arranged on the valve body (1), and the other part of the blowing channel is arranged on the seat body part (42);

the sealing oil path (8) is partially arranged on the valve body (1), and the other part of the sealing oil path is arranged on the seat body part (42).

10. Gas injection valve according to claim 7, wherein a first sealing ring and a second sealing ring are arranged between the valve body (1) and the seat part (42), the first sealing ring being located at the servo oil passage (6) and the second sealing ring being located at the sealing oil passage (8).