A gas injection valve

Abstract

The present invention relates to the field of gas valve engineering technology, and discloses a gas injection valve. The gas injection valve comprises a valve body, a gas delivery hole is provided at the front end of the valve body, and is characterized in that it also comprises an injection assembly and an air blowing channel, the injection assembly comprises a nozzle and a fastener, the nozzle is fixed to the valve body by the fastener, a chamber is provided in the fastener, and the connection between the nozzle and the valve body is located in the chamber; the air blowing channel is connected to the chamber, and the air blowing channel is used to purge the gas leaked at the connection. The present invention realizes the function of real-time purge of leaked gas, and improves the safety and practicality of the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of gas engine engineering, and in particular to a gas injection valve. Background Art

[0002] With the continuous development of the global economy, people's demand for energy is constantly increasing, and countries have turned their attention to gas engines and dual-fuel engines that use gas as fuel. As a direct control element for gas fuel injection, the gas injection valve has undoubtedly become one of the most core parts of gas engines and dual-fuel engines. The role of the high-pressure gas injection valve in gas engines and dual-fuel engines is to provide continuous and stable high-pressure gas for engine operation. The current high-pressure gas injection valve only has a single injection function. Due to the high pressure of gas inside the existing high-pressure gas injection valve, gas leakage often occurs. When the gas leaks too much from the gas pipeline inside the valve body, the concentration inside the valve body exceeds the safe value, it is easy to be ignited and explode, and the gas injection valve will explode, which is easy to cause danger.

[0003] Based on this, a gas injection valve is urgently needed to solve the above-mentioned problems. Summary of the invention

[0004] Based on the above, the purpose of the present invention is to provide a gas injection valve, which can achieve the function of purging leaked gas in real time and improve the safety and practicality of the equipment.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A gas injection valve comprises a valve body, a front end of which is provided with a gas delivery hole, and further comprises:

[0007] An injection assembly, the injection assembly comprising a nozzle and a fastener, the nozzle being fixed to the valve body by the fastener, a chamber being arranged in the fastener, and a connection between the nozzle and the valve body being located in the chamber;

[0008] An air blowing channel is communicated with the chamber, and the air blowing channel is used to purge the gas leaked at the connection.

[0009] 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 slidably and sealingly arranged in the first accommodating cavity;

[0010] A guide rod, the needle valve is provided with a second accommodating cavity, the front end of the guide rod is slidably and sealingly arranged in the second accommodating cavity, and the guide rod is provided with a gas transmission channel along its length direction;

[0011] A communication hole communicating with the second accommodating chamber is disposed at the front end of the needle valve, and the communication hole can communicate with the gas delivery channel and the gas delivery hole.

[0012] Preferably, a boss is provided at the front end of the needle valve, and the end of the communicating hole away from the second accommodating cavity is located on a portion of the front end surface of the needle valve where the boss is not provided. A tapered portion is provided at the front end of the boss, and a tapered hole matching the tapered portion is provided at one end of the gas delivery hole close to the boss, and the tapered portion can extend into the tapered hole to block the gas delivery hole.

[0013] Preferably, an elastic member is further included, and the guide rod includes a seat body portion and a rod body portion that are connected to each other, the rod body portion extends into the valve body, the seat body portion fits and is fixed on the valve body, and two ends of the elastic member are respectively pressed against the needle valve and the seat body portion, and the elastic member can drive the conical portion to extend into the conical hole to block the air supply hole.

[0014] Preferably, a stop protrusion is provided at the tail end ring of the needle valve, and the elastic member presses against the stop protrusion.

[0015] Preferably, a servo oil circuit is further included, the first accommodating chamber includes a first accommodating section and a second accommodating section which are coaxial and arranged in sequence, the inner diameter of the first accommodating section is smaller than the inner diameter of the second accommodating section, the first accommodating section is located at one end close to the gas delivery hole, the needle valve is provided with a step matching the second accommodating section, the servo oil circuit is connected to the step surface between the first accommodating section and the second accommodating section, high-pressure liquid or gas passes through the servo oil circuit, driving the needle valve to move in a direction away from the gas delivery hole to connect the gas delivery channel and the gas delivery hole.

[0016] Preferably, the gas injection valve further comprises a sealing oil circuit, the side wall of the needle valve is provided with an oil hole, the side wall of the second accommodating chamber is provided with an annular groove communicating with the oil hole, and the sealing oil circuit is communicated with the oil hole.

[0017] Preferably, the gas injection valve further includes a pressure-stabilizing oil circuit, the first accommodating chamber further includes a third accommodating section, the third accommodating section is located at an end of the second accommodating section away from the first accommodating section, the inner diameter of the second accommodating section is smaller than the inner diameter of the third accommodating section, the elastic member is located in the third accommodating section, and the pressure-stabilizing oil circuit is connected to the third accommodating section.

[0018] Preferably, the servo oil circuit is partially arranged on the valve body, and another part is arranged on the seat body; the blowing channel is partially arranged on the valve body, and another part is arranged on the seat body; the sealing oil circuit is partially arranged on the valve body, and another part is arranged on the seat body.

[0019] Preferably, a first sealing ring and a second sealing ring are provided between the valve body and the seat body, the first sealing ring is located at the servo oil circuit, and the second sealing ring is located at the sealing oil circuit.

[0020] The beneficial effects of the present invention are:

[0021] In this embodiment, the gas injection valve includes a valve body, an injection assembly and an air blowing channel. The front end of the valve body is provided with a gas delivery hole. The injection assembly includes a nozzle and a fastener. The nozzle is fixedly connected to the front end of the valve body by a fastener. A chamber is provided in the fastener, and the connection position between the nozzle and the valve body is located in the chamber. The air blowing channel is connected to the chamber. The fastener not only has the function of fixing the nozzle to the valve body, but also has the function of enabling the air blowing channel to purge the leaked gas at the connection position. During the gas delivery process of the gas injection valve, the air blowing channel can purge the leaked gas at the connection position to ensure the safety of the use of the gas injection valve. The present invention solves the problem of the single function of the traditional gas injection valve, realizes the function of the gas injection valve to purge the leaked gas in real time, and improves the safety and practicality of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments of the present invention. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the contents of the embodiments of the present invention and these drawings without paying any creative work.

[0023] Figure 1 is a structural diagram of a gas injection valve provided in a specific embodiment of the present invention;

[0024] Figure 2 is a front cross-sectional view of a gas injection valve in a closed state of a needle valve provided by a specific embodiment of the present invention;

[0025] Figure 3 is a front cross-sectional view of a valve body of a gas injection valve provided in a specific embodiment of the present invention;

[0026] Figure 4 It is a left sectional view of a gas injection valve in an open state of a needle valve provided by a specific embodiment of the present invention.

[0027] The following are marked in the figure:

[0028] 1-valve body; 11-air delivery hole; 12-first accommodating chamber; 121-first accommodating section; 122-second accommodating section; 123-third accommodating section;

[0029] 2-jet assembly; 21-nozzle; 211-jet hole; 22-fastener;

[0030] 3-needle valve; 31-connecting hole; 32-step; 33-oil hole; 34-boss; 35-stop protrusion;

[0031] 4-guide rod; 41-gas delivery channel; 42-seat body; 43-rod body;

[0032] 5-elastic part; 6-servo oil circuit; 7-air blowing channel; 8-sealing oil circuit; 9-pressure stabilizing oil circuit. DETAILED DESCRIPTION

[0033] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0034] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0036] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0037] like Figure 1 and Figure 2 As shown, the present invention provides a gas injection valve, which includes a valve body 1, an injection assembly 2 and a blowing channel 7. The front end of the valve body 1 is provided with a gas delivery hole 11, and the injection assembly 2 includes a nozzle 21 and a fastener 22. The nozzle 21 is provided with an injection hole 211, and the injection hole 211 is connected with the gas delivery hole 11. The nozzle 21 is fixedly connected with the front end of the valve body 1 through the fastener 22. A chamber is provided in the fastener 22, and the connection position of the nozzle 21 and the valve body 1 is located in the chamber. The blowing channel 7 runs through the gas injection valve along the length direction of the gas injection valve and is connected with the chamber. The fastener 22 not only has the function of fixing the nozzle 21 to the valve body 1, but also has the function of enabling the blowing channel 7 to purge the leaked gas at the connection position. During the gas delivery process of the gas injection valve, the blowing channel 7 can purge the gas leaked at the gas connection position to ensure the safety of the gas injection valve. The present invention solves the problem of the single function of the traditional gas injection valve, realizes the function of the gas injection valve to purge the leaked gas in real time, and improves the safety and practicality of the equipment.

[0038] Specifically, the gas injection valve further includes a guide rod 4, which includes a seat body portion 42 and a rod body portion 43 that are connected to each other and formed in one piece, the rod body portion 43 extends into the valve body 1, and the seat body portion 42 fits and is fixed to the valve body 1, more specifically, in this embodiment, it is fixed to the valve body 1 by screws. A portion of the blowing channel 7 is arranged on the side wall of the valve body 1 along the length direction of the valve body 1 and communicates with the chamber, and another portion is arranged on the side wall of the seat body portion 42 along the length direction of the guide rod 4.

[0039] The guide rod 4 is also provided with a connection hole, which replaces the cylinder head in the prior art and is connected to the external gas pipeline. The gas pipeline is usually a double-arm pipe structure. The blowing channel 7 is connected to the outer annular wall pipe of the double-arm pipe structure to transport air and purge the gas leaked in the connection gap and the chamber of the gas injection valve, thereby improving the safety of the equipment. At the same time, the gas injection valve of the cylinder head is reduced, so that the processing difficulty is reduced, and the processing and sealing cost of the cylinder head is reduced. The high-pressure gas injection valve is modularized and integrated, which is convenient for the maintenance and upgrading of the high-pressure gas injection module.

[0040] Furthermore, the gas injection valve also includes a needle valve 3, a first accommodating chamber 12 is provided in the valve body 1, and the needle valve 3 is slidably and sealingly arranged in the first accommodating chamber 12. A second accommodating chamber is provided 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 sealingly arranged in the second accommodating chamber. A gas delivery channel 41 is provided on the guide rod 4 along its length direction, and the guide rod 4 not only has a guiding function, but also has a function of conveying gas. A connecting hole 31 connected to the second accommodating chamber is provided at the front end of the needle valve 3, and the connecting hole 31 can connect the gas delivery channel 41 and the gas delivery hole 11 for gas delivery.

[0041] Furthermore, if Figure 2 and Figure 3 As shown, in order to achieve the blocking of the gas transmission by the needle valve 3, a boss 34 is provided at the front end of the needle valve 3, and the end of the communication hole 31 away from the second accommodating cavity is located on the 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, and a tapered hole matching the tapered portion is provided at the end of the gas delivery hole 11 close to the boss 34. The tapered portion can extend into the tapered hole to block the gas delivery hole 11. A cone valve is formed between the tapered portion and the tapered hole. When the boss 34 blocks the gas delivery hole 11, the cone valve structure improves the sealing between the boss 34 and the gas delivery hole 11.

[0042] Preferably, the gas injection valve further comprises an elastic member 5. In this embodiment, the elastic member 5 is preferably a spring structure. The elastic member 5 is sleeved on the rod body portion 43. The two ends of the elastic member 5 are respectively pressed against the needle valve 3 and the seat body portion 42. The elastic member 5 can drive the tapered portion to extend into the tapered hole to block the gas delivery hole 11. Specifically, a stop protrusion 35 is provided around the tail end of the needle valve 3. The stop protrusion 35 has a limiting effect on the needle valve 3, and the elastic member 5 is pressed against the stop protrusion 35. Further preferably, a third sealing ring is provided between the seat body portion 42 and the valve body 1 to achieve sealing between the seat body portion 42 and the valve body 1.

[0043] It should be noted that in order to make the boss 34 of the needle valve 3 in the gas injection valve separate from the gas delivery hole 11 and connect to the gas delivery channel, the gas injection valve also includes a servo oil circuit 6. The first accommodating chamber 12 includes a first accommodating section 121, a second accommodating section 122 and a third accommodating section 123 which are coaxially and sequentially arranged. The inner diameter of the first accommodating section 121 is smaller than the inner diameter of the second accommodating section 122. The first accommodating section 121 is located at one end close to the gas delivery hole 11, and the third accommodating section 123 is located at one end of the second accommodating section 122 away from the first accommodating section 121. The inner diameter of the second accommodating section 122 is smaller than the inner diameter of the third accommodating section 123. The needle valve 3 is provided with a step 32 matching the second accommodating section 122. The servo oil circuit 6 is partially arranged on the side wall of the valve body 1 and connected to the step surface between the first accommodating section 121 and the second accommodating section 122, and the other part is arranged on the side wall of the seat body 42 and connected to the external oil supply device. In addition, between the valve body 1 and the seat body portion 42, the servo oil circuit 6 is provided with a first sealing ring to achieve sealing of the servo oil circuit 6 between the valve body 1 and the seat body portion 42. The servo oil circuit 6 is connected to the step surface between the first accommodating section 121 and the second accommodating section 122. High-pressure liquid or gas is passed through the servo oil circuit 6. In this embodiment, high-pressure liquid is preferably used. The high-pressure liquid drives the needle valve 3 to move away from the gas delivery hole 11 to connect the gas delivery channel 41 and the gas delivery hole 11 to complete the delivery of the gas.

[0044] Preferably, if Figure 4 As shown, due to processing errors, high gas pressure and other factors, it is difficult to ensure that high-pressure gas will not leak from the side wall between the needle valve 3 and the guide rod 4. Therefore, in order to prevent gas leakage, the gas injection valve also includes a sealing oil circuit 8. The side wall of the needle valve 3 is provided with an oil hole 33, and the side wall of the second accommodating chamber is provided with an annular groove connected to the oil hole 33, and the sealing oil circuit 8 is connected to the oil hole 33. The side wall of the first accommodating chamber 12 is also provided with an annular groove connected to the oil hole 33. When the gas valve is in the working state, the annular grooves on the side wall of the second accommodating chamber and the side wall of the first accommodating chamber 12 are filled with liquid, and the liquid blocks the gap, so that the gas cannot leak from the gap, thereby improving the safety of the equipment. Specifically, part of the sealing oil circuit 8 is arranged on the side wall of the valve body 1 and is connected to the oil hole 33, and the other part is arranged on the side wall of the seat body 42 and is connected to the external oil supply device. In addition, a second sealing ring is provided on the sealing oil circuit 8 between the valve body 1 and the seat body portion 42 to achieve sealing of the sealing oil circuit 8 between the valve body 1 and the seat body portion 42 .

[0045] Preferably, since the needle valve 3 is slidably connected to the valve body 1, and the liquid in the servo oil circuit 6 is usually under a high pressure, after the gas injection valve is used for a period of time, there will be wear between the needle valve 3 and the valve body 1, and it is difficult to ensure that the high-pressure liquid in the servo oil circuit 6 does not overflow from between the needle valve 3 and the valve body 1, so the gas injection valve also includes a pressure-stabilizing oil circuit 9. The elastic member 5 is located in the third accommodating section 123, and the pressure-stabilizing oil circuit 9 is connected to the third accommodating section 123. The pressure-stabilizing oil circuit 9 is used to provide a stable oil pressure for the third accommodating section 123, prevent the overflow of the high-pressure liquid, increase the service life of the gas injection valve, and reduce wear. Specifically, the pressure-stabilizing oil circuit 9 is arranged on the side wall of the guide rod seat, and one end is connected to the third accommodating section 123, and the other end is connected to the oil supply device.

[0046] It should be noted that the specific working principle of gas delivery of a gas injection valve provided by the present invention is as follows:

[0047] When the gas injection valve is working, the oil supply device delivers high-pressure liquid to the stepped surface of the stepped hole through the servo oil circuit 6, increasing the oil pressure at the bottom of the step 32 of the needle valve 3. At this time, the liquid pressure at the bottom of the step 32 is greater than the elastic force of the spring member, so that the needle valve 3 moves away from the gas delivery hole 11, the boss 34 moves away from the gas delivery hole 11, the gas delivery channel 41 is connected with the gas delivery hole 11, and a gas passage is formed, and the gas flows out from the injection hole 211 of the nozzle 21. In this process, the sealing oil circuit 8, the blowing channel 7 and the pressure stabilizing oil circuit 9 are all in working state.

[0048] When the gas injection valve needs to stop working, the oil supply device connected to the servo oil circuit 6 stops working and performs low-pressure oil return, and the liquid at the bottom of the step 32 of the needle valve 3 flows out through the servo oil circuit 6 to release pressure. At this time, the liquid pressure at the bottom of the step 32 of the needle valve 3 is less 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 delivery hole 11, blocking the gas delivery hole 11, and the gas delivery channel is closed.

[0049] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A gas injection valve, comprising a valve body (1), wherein a gas delivery hole (11) is provided at the front end of the valve body (1), characterized in that: Also includes: An injection assembly (2), the injection assembly (2) comprising a nozzle (21) and a fastener (22), the nozzle (21) being fixed to the valve body (1) via the fastener (22), a chamber being provided in the fastener (22), and a connection between the nozzle (21) and the valve body (1) being located in the chamber; an air blowing channel (7) which is in communication with the chamber, and the air blowing channel (7) is used to purge the gas leaking from the connection; A needle valve (3), wherein a first accommodating chamber (12) is arranged in the valve body (1), and the needle valve (3) is slidably and sealingly arranged in the first accommodating chamber (12); A guide rod (4), the guide rod (4) comprising a seat body portion (42) and a rod body portion (43) connected to each other, a second accommodating cavity being arranged in the needle valve (3), a front end of the guide rod (4) being slidably and sealingly arranged in the second accommodating cavity, and a gas delivery channel (41) being arranged along the length direction of the guide rod (4); The blowing channel (7) is partially arranged on the valve body (1), and the other part is arranged on the seat body (42); the guide rod (4) is also provided with a connecting hole, the connecting hole is connected to an external gas pipeline, the gas pipeline is a double-arm pipe structure, and the blowing channel (7) is connected to the outer annular wall pipe of the double-arm pipe structure to transport air; A sealed oil circuit (8), the side wall of the needle valve (3) is provided with an oil hole (33), the side wall of the second accommodating chamber is provided with an annular groove communicating with the oil hole (33), and the sealed oil circuit (8) is communicated with the oil hole (33); A communication hole (31) communicating with the second accommodating chamber is provided at the front end of the needle valve (3), and the communication hole (31) can communicate with the gas delivery channel (41) and the gas delivery hole (11).

2. The gas injection valve according to claim 1, characterized in that: A boss (34) is provided at the front end of the needle valve (3); an end of the communicating hole (31) away from the second accommodating cavity 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); an end of the gas delivery hole (11) close to the boss (34) is provided with a tapered hole matching the tapered portion; the tapered portion can extend into the tapered hole to block the gas delivery hole (11).

3. The gas injection valve according to claim 2, characterized in that: It also includes an elastic member (5), the rod body portion (43) extends into the valve body (1), the seat body portion (42) is fitted and fixed on the valve body (1), and the two ends of the elastic member (5) are respectively pressed against the needle valve (3) and the seat body portion (42), and the elastic member (5) can drive the conical portion to extend into the conical hole to block the gas delivery hole (11).

4. The gas injection valve according to claim 3, characterized in that: A stop protrusion (35) is provided around the tail end of the needle valve (3), and the elastic member (5) is pressed against the stop protrusion (35).

5. The gas injection valve according to claim 3, characterized in that: The invention also comprises a servo oil circuit (6); the first accommodating chamber (12) comprises a first accommodating section (121) and a second accommodating section (122) which are coaxially and sequentially arranged; the inner diameter of the first accommodating section (121) is smaller than the inner diameter of the second accommodating section (122); the first accommodating section (121) is located at one end close to the gas delivery hole (11); the needle valve (3) is provided with a step (32) matching the second accommodating section (122); the servo oil circuit (6) is connected to the step surface between the first accommodating section (121) and the second accommodating section (122); a high-pressure liquid or gas flows in the servo oil circuit (6) to drive the needle valve (3) to move in a direction away from the gas delivery hole (11) so as to connect the gas delivery channel (41) and the gas delivery hole (11).

6. The gas injection valve according to claim 5, characterized in that: The gas injection valve further comprises a pressure-stabilizing oil circuit (9); the first accommodating chamber (12) further comprises a third accommodating section (123); the third accommodating section (123) is located at an end of the second accommodating section (122) away from the first accommodating section (121); the inner diameter of the second accommodating section (122) is smaller than the inner diameter of the third accommodating section (123); the elastic member (5) is located in the third accommodating section (123); and the pressure-stabilizing oil circuit (9) is connected to the third accommodating section (123).

7. The gas injection valve according to claim 6, characterized in that: The servo oil circuit (6) is partially arranged on the valve body (1), and the other part is arranged on the seat body (42); Part of the sealing oil circuit (8) is arranged on the valve body (1), and the other part is arranged on the seat body (42).

8. The gas injection valve according to claim 6, characterized in that: A first sealing ring and a second sealing ring are provided between the valve body (1) and the seat body portion (42), the first sealing ring being located at the servo oil circuit (6), and the second sealing ring being located at the sealing oil circuit (8).

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