Supercharged dimethyl ether injection device

Abstract

Dimethyl ether with a certain pressure passes through an oil inlet valve assembly, overcomes the pre-tightening force of the oil inlet valve assembly under the action of the front-back pressure difference of the oil inlet valve assembly, enters a pressurizing cavity of a pressurizing valve assembly and pushes the pressurizing valve assembly to move in the direction away from an oil outlet valve assembly till the pressurizing valve assembly is reset. When the pressure increasing valve assembly is opened, the servo oil pushes the pressure increasing valve assembly to move towards the oil outlet valve assembly, the pressure increasing cavity builds pressure, the oil inlet valve assembly and the circulating valve set are closed under the action of pressure difference, the oil outlet valve assembly is opened under the action of high-pressure dimethyl ether, and the high-pressure dimethyl ether enters an oil containing groove of the ejector pin injection assembly. When the pressure of dimethyl ether in the pressurizing cavity is larger than the opening pressure of the ejector pin injection assembly, the ejector pin injection assembly is opened, dimethyl ether enters the shell body to be injected, after injection is finished, the closing pressure of the ejector pin injection assembly is high, the ejector pin injection assembly is firstly closed, then the pressure of the oil outlet valve assembly is closed, and gasification caused by the influence of the temperature of an air cylinder is prevented.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel injection of ship engines, in particular to a pressurized dimethyl ether injection device. Background Art

[0002] With the increasing shortage of oil resources and the intensification of environmental pollution, the search for alternative energy sources has become a global issue. Dimethyl ether (DME), as a clean and efficient alternative fuel, has attracted attention due to its superior combustion characteristics and low pollution emissions. Due to the strong volatility of DME, the high temperature in the cylinder during engine operation can easily cause high-pressure DME to gasify, affecting the stability of the DME injection process. At the same time, volatile gas can easily cause personnel safety accidents. Therefore, it is necessary to design an injector that can meet the requirements of high-pressure stable injection of DME, stable phase during the working process, and with high safety protection measures based on the special thermophysical properties of DME.

[0003] At present, there are two technical difficulties in the dimethyl ether fuel injection device: the stable injection of low-pressure dimethyl ether fuel due to the high volatility of dimethyl ether, and the traditional mechanical pump pressurization method is prone to explosion; under the high heat load environment during the operation of the main engine, the temperature of the dimethyl ether inside the injector may be too high and vaporize, affecting the injection characteristics, and then affecting the normal operation of the injector and the working performance of the main engine.

[0004] On the other hand, for safety reasons, dimethyl ether has an inhibitory effect on the central nervous system and inhalation after leakage can cause anesthesia. When the main engine working fuel mode is switched, in order to avoid large-scale volatilization of dimethyl ether caused by high temperature, it is necessary to purge the low-pressure and high-pressure dimethyl ether during the injection period and store it in a special safety container.

[0005] Therefore, there is an urgent need to provide a dimethyl ether injection device that can not only realize the pressure-building injection function, but also has leakage protection measures, and also has a cooling circulation function and a purge function. Utility Model Content

[0006] The present application provides a pressurized dimethyl ether injection device, which can realize the pressure-building injection function, has leakage protection measures, and also has cooling circulation and purging functions.

[0007] The present application provides a pressurized dimethyl ether injection device, comprising: a shell body, provided with a first direction oil circuit, a second direction oil circuit, and a third direction oil circuit; a boost valve assembly, arranged on the shell body, and a driving chamber and a boost chamber are formed between the boost valve assembly and the shell body; an oil outlet valve assembly, arranged on the shell body; a ejector pin injection assembly, arranged on the shell body, and the boost valve assembly, the oil outlet valve assembly, and the ejector pin injection assembly are sequentially arranged in the axial direction of the shell body to form a dimethyl ether injection oil circuit; a drive assembly, arranged on the shell body, and communicated with the drive chamber of the boost valve assembly; an oil inlet valve assembly, arranged on the shell body, and the oil inlet valve assembly communicates with the drive chamber of the boost valve assembly; The boosting chamber of the boosting valve assembly is connected to the boosting chamber through the first directional oil circuit, and the oil inlet valve assembly is connected to the oil outlet valve assembly through the second directional oil circuit; a circulating valve assembly is arranged on the shell body, the circulating valve assembly is connected to the boosting valve assembly through the first directional oil circuit, the circulating valve assembly is connected to the oil outlet valve assembly through the second directional oil circuit, and the third directional oil circuit is connected to the second directional oil circuit and the ejector injection assembly; a purge input valve assembly is arranged on the shell body, connecting the oil outlet valve assembly and the third directional oil circuit; a purge output valve assembly is arranged on the shell body, connecting the oil outlet valve assembly and the third directional oil circuit.

[0008] In some optional embodiments, the oil outlet valve assembly includes an oil outlet valve body, and the oil outlet valve body is provided with a accommodating space; the boosting valve assembly includes a boosting piston, a pressure support rod and a first elastic component, the boosting piston and the pressure support rod are arranged face to face, and the boosting chamber is formed between the area between the boosting piston and the pressure support rod and the shell body; the driving chamber is formed between the outer surface of the boosting piston and the shell body; the first elastic component is inserted into the end of the pressure support rod away from the boosting piston, and the first elastic component is arranged on the oil outlet valve body.

[0009] In some optional embodiments, the first direction oil circuit connects the oil inlet valve assembly and the area where the boost piston and the pressure support rod are arranged face to face, and the first direction oil circuit connects the circulating valve assembly and the area where the boost piston and the pressure support rod are arranged face to face; the second direction oil circuit connects the oil inlet valve assembly and the oil outlet valve body, and the second direction oil circuit connects the circulating valve assembly and the oil outlet valve body.

[0010] In some optional embodiments, the shell body encloses a conical shape to form the first direction oil path.

[0011] In some optional embodiments, the shell body encloses a conical shape to form the second direction oil path.

[0012] In some optional embodiments, the shell body encloses the third directional oil passage to form a cylindrical shape.

[0013] In some optional embodiments, the oil inlet valve assembly includes an oil inlet valve body, a support body, a T-shaped plug, a second elastic component and an oil inlet pipe, the oil inlet valve body is snapped onto the support body, the support body is snapped onto the oil inlet pipe, the support body is connected to the oil inlet pipe, the second elastic component is sleeved on the support body, and the T-shaped plug is inserted into the support body.

[0014] In some optional embodiments, the circulation valve assembly includes a circulation valve body, a first conical plug, a fourth elastic component, a first supporting component and a circulation pipe, the supporting component is sleeved on the circulation pipe, the supporting component is connected to the circulation pipe, the circulation valve body is buckled on the first supporting component, the first conical plug is pressed against the first supporting component, and the fourth elastic component is sleeved on the first conical plug.

[0015] In some optional embodiments, the purge input valve assembly includes a purge input valve body, a second conical plug, a third elastic component, a second supporting component and a nitrogen output pipe, the second supporting component is sleeved on the nitrogen output pipe, the second supporting component is connected to the nitrogen output pipe, the purge input valve body is buckled on the second supporting component, the second conical plug is pressed against the second supporting component, and the third elastic component is sleeved on the second conical plug.

[0016] In some optional embodiments, the purge output valve assembly includes a purge output pipe, a third supporting component and a base, the base is arranged on the shell body, the third supporting component is pressed against the base, and the purge output pipe is plugged into the third supporting component.

[0017] Compared with the prior art, the utility model has the following technical effects:

[0018] 1. The present application provides a pressurized dimethyl ether injection device, wherein dimethyl ether of a certain pressure passes through an oil inlet valve assembly, and under the action of the pressure difference before and after the oil inlet valve assembly, overcomes the pre-tightening force of the oil inlet valve assembly, enters the pressurization chamber of the pressurization valve assembly, and pushes the pressurization valve assembly to move in a direction away from the oil outlet valve assembly until the pressurization valve assembly is reset. When the pressurization valve assembly is opened, servo oil of a certain pressure is supplied to the driving chamber of the pressurization valve assembly, pushing the pressurization valve assembly to move in the direction of the oil outlet valve assembly, and the pressurization chamber is pressurized. The oil inlet valve assembly and the circulation valve group are closed under the action of the pressure difference, and the oil outlet valve assembly is opened under the action of the high-pressure dimethyl ether, and the high-pressure dimethyl ether enters the oil storage tank of the ejector injection assembly. When the pressure of the dimethyl ether inside the pressurization chamber is greater than the opening pressure of the ejector injection assembly, the ejector injection assembly is opened, and the dimethyl ether enters the oil injection nozzle of the shell body for injection. When the injection is completed, the closing pressure of the ejector injection assembly is high, the ejector injection assembly is closed first, and then the oil outlet valve assembly closes the pressure to prevent gasification due to the influence of the cylinder temperature.

[0019] 2. Before the boost piston is reset and until the next injection is started, the dimethyl ether enters the boost chamber of the boost valve assembly with a certain supply pressure, and the back pressure of the circulating valve assembly has a certain pressure. The supply pressure is greater than the back pressure of the circulating valve assembly. Under the action of the pressure difference, the oil inlet valve assembly opens, the circulating valve assembly opens, and the dimethyl ether flows into the boost chamber and flows away through the circulating valve assembly, continuously taking away heat from the boost chamber, so that the dimethyl ether injector maintains a stable temperature and prevents gasification due to low pressure during the injection interval, which affects the performance of the boosted dimethyl ether injection device and causes safety problems.

[0020] 3. The low-pressure self-purging function of dimethyl ether is realized in this way. After the fuel mode is switched, the dimethyl ether pressure in the ejector assembly gradually decreases. When the dimethyl ether pressure is lower than the preset pressure, the purge output valve assembly opens under the action of the return valve spring, and the purge input valve assembly opens under the action of the preset nitrogen pressure. Nitrogen passes through the dimethyl ether injection oil circuit, and the residual dimethyl ether is blown into the collection volume through the purge output valve assembly to achieve the inerting of the dimethyl ether injection oil circuit. During the normal operation of the dimethyl ether injector, after the injection is completed, the dimethyl ether injection oil circuit will be maintained at the preset pressure. If the dimethyl ether high-pressure oil circuit leaks, the dimethyl ether pressure in the dimethyl ether injection oil circuit decreases. When the pressure is lower than the preset pressure, the purge output valve assembly automatically opens under the action of the pressure difference, and the remaining dimethyl ether is blown into the collection volume to prevent a large amount of dimethyl ether from leaking. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0022] Figure 1 A schematic diagram showing a cross section of a pressurized dimethyl ether injection device provided by an embodiment of the utility model is shown;

[0023] Figure 2 for Figure 1 A schematic diagram of an oil inlet valve assembly of the provided embodiment;

[0024] Figure 3 for Figure 1 A schematic diagram of a circulation valve assembly of a provided embodiment;

[0025] Figure 4 for Figure 1 A schematic diagram of a purge input valve assembly of a provided embodiment;

[0026] Figure 5 for Figure 1 Schematic diagram of a purge output valve assembly of a provided embodiment.

[0027] in, Figures 1 to 5 The corresponding relationship between the reference numerals and component names in the figure is:

[0028] 1-shell body; 11-first direction oil circuit; 12-second direction oil circuit; 13-third direction oil circuit; 14-injector nozzle; 2-boost valve assembly; 21-boost piston; 22-pressure support rod; 23-first elastic component; 3-oil outlet valve assembly; 31-oil outlet valve body; 4-throw needle injection assembly; 41-needle valve body; 42-needle valve; 44-fourth spring; 5-inlet valve assembly; 51-inlet valve body; 52-support body; 53-T-shaped plug; 54-second elastic component; 55-oil inlet pipe; 6-circulation valve assembly; 61-circulation valve body; 62-first conical plug; 63-fourth elastic component; 64-first supporting component; 65-circulation pipeline; 7-purge input valve assembly; 71-purge input valve body; 72-second conical plug; 73-third elastic component; 74-second supporting component; 75-nitrogen output pipeline; 8-purge output valve assembly; 81-purge output pipeline; 82-third supporting component; 83-base; 9-drive valve assembly. DETAILED DESCRIPTION

[0029] In order to more clearly understand the above-mentioned purpose, features and advantages of the utility model, the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0031] With the increasing shortage of oil resources and the intensification of environmental pollution, the search for alternative energy sources has become a global issue. Dimethyl ether (DME), as a clean and efficient alternative fuel, has attracted attention due to its superior combustion characteristics and low pollution emissions. Due to the strong volatility of DME, the high temperature in the cylinder during engine operation can easily cause high-pressure DME to gasify, affecting the stability of the DME injection process. At the same time, volatile gas can easily cause personnel safety accidents. Therefore, it is necessary to design an injector that can meet the requirements of high-pressure stable injection of DME, stable phase during the working process, and with high safety protection measures based on the special thermophysical properties of DME.

[0032] At present, there are two technical difficulties in the dimethyl ether fuel injection device: the stable injection of low-pressure dimethyl ether fuel due to the high volatility of dimethyl ether, and the traditional mechanical pump pressurization method is prone to explosion; under the high heat load environment during the operation of the main engine, the temperature of the dimethyl ether inside the injector may be too high and vaporize, affecting the injection characteristics, and then affecting the normal operation of the injector and the working performance of the main engine.

[0033] On the other hand, for safety reasons, dimethyl ether has an inhibitory effect on the central nervous system and inhalation after leakage can cause anesthesia. When the main engine working fuel mode is switched, in order to avoid large-scale volatilization of dimethyl ether caused by high temperature, it is necessary to purge the low-pressure and high-pressure dimethyl ether during the injection period and store it in a special safety container.

[0034] Therefore, there is an urgent need to provide a pressurized dimethyl ether injection device that can not only realize the pressure-building injection function, but also has leakage protection measures, and also has a cooling circulation function and a purge function.

[0035] The present application provides a pressurized dimethyl ether injection device, which includes: a shell body 1, which is provided with a first direction oil circuit 11, a second direction oil circuit 12, and a third direction oil circuit 13; a boost valve assembly 2, which is arranged on the shell body 1, and a driving chamber and a boost chamber are formed between the boost valve assembly 2 and the shell body 1; an oil outlet valve assembly 3, which is arranged on the shell body 1; a ejector needle assembly 4, which is arranged on the shell body 1, and the boost valve assembly 2, the oil outlet valve assembly 3 and the ejector needle assembly 4 are arranged in sequence in the axial direction of the shell body 1 to form a dimethyl ether injection oil circuit; a drive assembly, which is arranged on the shell body 1 and is connected to the drive chamber of the boost valve assembly 2; an oil inlet valve assembly 5, which is arranged on the shell body 1, the oil inlet valve assembly 5 is connected to the boosting chamber of the boosting valve assembly 2 through the first direction oil circuit 11, and the oil inlet valve assembly 5 is connected to the oil outlet valve assembly 3 through the second direction oil circuit 12; the circulating valve assembly 6 is arranged on the shell body 1, the circulating valve assembly 6 is connected to the boosting valve assembly 2 through the first direction oil circuit 11, the circulating valve assembly 6 is connected to the oil outlet valve assembly 3 through the second direction oil circuit 12, and the third direction oil circuit 13 is connected to the second direction oil circuit 12 and the ejector needle injection assembly 4; the purge input valve assembly 7 is arranged on the shell body 1, and is connected to the oil outlet valve assembly 3 and the third direction oil circuit 13; the purge output valve assembly 8 is arranged on the shell body 1, and is connected to the oil outlet valve assembly 3 and the third direction oil circuit 13.

[0036] Specifically, the ejector assembly 4 includes a needle valve body 41, a needle valve 42 and a fourth spring 44. The needle valve body 41 is provided with a first through hole, an oil storage groove and a second through hole. The diameter of the first through hole is greater than the diameter of the second through hole. The diameter of the needle valve 42 is greater than the diameter of the second through hole formed by the needle valve body 41. The fourth spring 44 is provided in the receiving groove of the shell body 1. One end of the needle valve 42 is connected to the oil outlet valve body 31. The other end of the needle valve 42 is plugged into the fourth spring 44. The other end of the needle valve 42 penetrates the fourth spring 44 and is plugged into the oil storage groove of the needle valve body 41. The needle valve 42 is pressed against the position where the oil storage groove and the second through hole contact. After dimethyl ether is injected into the oil inlet valve assembly 5, a part of the dimethyl ether enters the boosting chamber through the first direction oil path 11, and a part of the dimethyl ether enters the oil outlet valve assembly 3 through the second direction oil path 12, and then enters the ejector assembly 4. The ejector assembly 4 is provided at the position of the oil injection nozzle 14 of the shell body 1. The ejector assembly 4 can control the opening and blocking of the oil injection nozzle 14.

[0037] Specifically, the boost injection function of dimethyl ether is achieved in this way: after the last injection is completed, the servo oil pressure in the drive chamber is reduced, and the dimethyl ether with a pressure of 53 bar passes through the oil inlet valve assembly 5. Under the action of the pressure difference before and after the oil inlet valve assembly 5, the pre-tightening force of the oil inlet valve assembly 5 is overcome, and the dimethyl ether enters the boost chamber of the boost valve assembly 2, and pushes the boost valve assembly 2 in a direction away from the oil outlet valve assembly 3 until the boost valve assembly 2 is reset. When the boost valve assembly 2 is opened, 300 bar of servo oil is supplied to the drive chamber of the boost valve assembly 2, pushing the boost valve assembly 2 in the direction of the oil outlet valve assembly 3, and the boost chamber builds pressure. The circulation valve group is closed under the action of the pressure difference, and the oil outlet valve assembly 3 is opened under the action of the high-pressure dimethyl ether, and the high-pressure dimethyl ether enters the oil storage tank of the ejector needle injection assembly 4. When the pressure of dimethyl ether inside the boost chamber is greater than the opening pressure of the needle valve 42 in the ejector needle injection assembly 4, the needle valve 42 of the ejector needle injection assembly 4 opens, and dimethyl ether enters the injection nozzle 14 of the shell body 1 for injection. When the injection is completed, the closing pressure of the needle valve 42 of the ejector needle injection assembly 4 is relatively high, and the needle valve 42 of the ejector needle injection assembly 4 is closed first, and then the oil outlet valve assembly closes the pressure. The dimethyl ether injection oil circuit maintains a pressure of 80 bar to prevent gasification due to the influence of the cylinder temperature.

[0038] Before the boost piston 21 is reset until the next injection is started, the dimethyl ether enters the boost chamber of the boost valve assembly 2 with a supply pressure of 53 bar, and the back pressure of the circulation valve assembly 6 is 20 bar. Under the action of the pressure difference, the oil inlet valve assembly 5 opens, the circulation valve assembly 6 opens, and 53 bar of dimethyl ether flows into the boost chamber and flows away through the circulation valve assembly 6, continuously taking away heat from the boost chamber, so that the dimethyl ether injector maintains a stable temperature and prevents gasification due to low pressure during the injection interval, which affects the performance of the boosted dimethyl ether injection device and causes safety problems.

[0039] The low-pressure self-purging function of dimethyl ether is realized in this way. After the fuel mode is switched, the dimethyl ether pressure in the ejector assembly 4 gradually decreases. When the dimethyl ether pressure is lower than the preset pressure, the purge output valve assembly 8 opens under the action of the return valve spring, and the purge input valve assembly 7 opens under the action of the preset nitrogen pressure. Nitrogen passes through the dimethyl ether injection oil circuit, and the residual dimethyl ether is blown into the collection volume through the purge output valve assembly 8 to achieve the inerting of the dimethyl ether injection oil circuit. During the normal operation of the dimethyl ether injector, after the injection is completed, the dimethyl ether injection oil circuit will be maintained at the preset pressure. If the dimethyl ether high-pressure oil circuit leaks, the pressure of dimethyl ether in the dimethyl ether injection oil circuit decreases. When the pressure is lower than the preset pressure, the purge output valve assembly 8 automatically opens under the action of the pressure difference, and the remaining dimethyl ether is blown into the collection volume to prevent a large amount of dimethyl ether from leaking.

[0040] In some optional embodiments, the oil outlet valve assembly 3 includes an oil outlet valve body 31, and the oil outlet valve body 31 is provided with a accommodating space; the boosting valve assembly 2 includes a boosting piston 21, a pressure support rod 22 and a first elastic component 23, the boosting piston 21 and the pressure support rod 22 are arranged face to face, and a boosting chamber is formed between the area between the boosting piston 21 and the pressure support rod 22 and the shell body 1; a driving chamber is formed between the outer surface of the boosting piston 21 and the shell body 1; the first elastic component 23 is inserted into the end of the pressure support rod 22 away from the boosting piston 21, and the first elastic component 23 is arranged on the oil outlet valve body 31.

[0041] Specifically, the boost valve assembly 2 is arranged on the shell body 1, the boost piston 21 and the pressure support rod 22 are arranged face to face, the boost piston 21 is provided with a receiving groove which is recessed from the outer surface to the inner surface, and a driving cavity is formed between the receiving groove and the shell body 1, and the driving valve assembly 9 injects pressure oil into the driving cavity, so that the boost piston 21 has a certain pressure. The boost piston 21 can move toward the axial direction of the boosted dimethyl ether injection device, so that the distance between the boost piston 21 and the pressure support rod 22 can be changed. Since the boost piston 21 and the pressure support rod 22 are arranged inside the shell body 1, the area between the boost piston 21 and the pressure support rod 22 and the shell body 1 form a boost cavity. After the pressure of dimethyl ether injected into the oil inlet valve assembly 5 is greater than the pressure of the pressure oil injected into the driving cavity by the driving valve assembly 9, the dimethyl ether enters the boost cavity through the first direction oil path 11, and pushes the boost piston 21 to move in the direction away from the oil outlet valve assembly 3.

[0042] In some optional embodiments, the boost valve assembly 2 includes a boost piston 21, a pressure support rod 22 and a first elastic component 23. The boost piston 21 and the pressure support rod 22 are arranged face to face. The end of the pressure support rod 22 away from the boost piston 21 is connected to the first elastic component 23. The first elastic component 23 is arranged on the oil outlet valve body 31. The first direction oil circuit 11 connects the oil inlet valve assembly 5 and the area where the boost piston 21 and the pressure support rod 22 are arranged face to face. The first direction oil circuit 11 connects the circulation valve assembly 6 and the area where the boost piston 21 and the pressure support rod 22 are arranged face to face; the second direction oil circuit 12 connects the oil inlet valve assembly 5 and the oil outlet valve body 31. The second direction oil circuit 12 connects the circulation valve assembly 6 and the oil outlet valve body 31.

[0043] In some optional embodiments, the oil outlet valve assembly 3 includes an oil outlet valve body 31 with an accommodating space; the boost valve assembly 2 includes a boost piston 21, a pressure support rod 22 and a first elastic component 23, the boost piston 21 and the pressure support rod 22 are arranged face to face, the end of the pressure support rod 22 away from the boost piston 21 is connected to the first elastic component 23, and the first elastic component 23 is arranged on the oil outlet valve body 31; the first direction oil circuit 11 connects the oil inlet valve assembly 5 and the area where the boost piston 21 and the pressure support rod 22 are arranged face to face, the first direction oil circuit 11 connects the circulating valve assembly 6 and the area where the boost piston 21 and the pressure support rod 22 are arranged face to face; the second direction oil circuit 12 connects the oil inlet valve assembly 5 and the oil outlet valve body 31, and the second direction oil circuit 12 connects the circulating valve assembly 6 and the oil outlet valve body 31.

[0044] In some optional embodiments, the shell body 1 encloses the first direction oil passage 11 and the shape is conical.

[0045] In some optional embodiments, the second direction oil passage 12 enclosed by the shell body 1 is in a conical shape.

[0046] In some optional embodiments, the shell body 1 encloses and forms the third directional oil passage 13 in a cylindrical shape.

[0047] In some optional embodiments, the oil inlet valve assembly 5 includes an oil inlet valve body 51, a support body 52, a T-shaped plug 53, a second elastic component 54 and an oil inlet pipe 55, the oil inlet valve body 51 is snapped into the support body 52, the support body 52 is snapped into the oil inlet pipe 55, the support body 52 is connected to the oil inlet pipe 55, the second elastic component 54 is sleeved on the support body 52, and the T-shaped plug 53 is inserted into the support body 52.

[0048] In some optional embodiments, the circulation valve assembly 6 includes a circulation valve body 61, a first conical plug 62, a fourth elastic component 63, a first supporting component 64 and a circulation pipe 65, the supporting component 64 is sleeved on the circulation pipe 65, the supporting component 64 is connected to the circulation pipe 65, the circulation valve body 61 is buckled on the first supporting component 64, the first conical plug 62 is pressed against the first supporting component 64, and the fourth elastic component 63 is sleeved on the first conical plug 62.

[0049] In some optional embodiments, the purge input valve assembly 7 includes a purge input valve body 71, a second conical plug 72, a third elastic component 73, a second supporting component 74 and a nitrogen output pipe 75. The second supporting component 74 is sleeved on the nitrogen output pipe 75, the second supporting component 74 is connected to the nitrogen output pipe 75, the purge input valve body 71 is buckled on the second supporting component 74, the second conical plug 72 is pressed against the second supporting component 74, and the third elastic component 73 is sleeved on the second conical plug 72.

[0050] In some optional embodiments, the purge output valve assembly 8 includes a purge output pipe 81, a third supporting component 82 and a base 83, the base 83 is arranged on the shell body 1, the third supporting component 82 is pressed against the base 83, and the purge output pipe 81 is plugged into the third supporting component 82.

[0051] In the present invention, the term "plurality" means at least two or more than two, unless otherwise clearly defined. The terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "connected" can be a direct connection or an indirect connection through an intermediate medium. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances.

[0052] In the description of this specification, the description of the terms "one embodiment", "some embodiments", "specific embodiments", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0053] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may be subject to various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A pressurized dimethyl ether injection device, characterized in that: include: The shell body (1) is provided with a first direction oil passage (11), a second direction oil passage (12), and a third direction oil passage (13); A boost valve assembly (2) is arranged on the shell body (1), and a driving chamber and a boost chamber are formed between the boost valve assembly (2) and the shell body (1); An oil outlet valve assembly (3) is arranged on the shell body (1); The ejector needle injection assembly (4) is arranged on the shell body (1), and the boost valve assembly (2), the oil outlet valve assembly (3) and the ejector needle injection assembly (4) are arranged in sequence in the axial direction of the shell body (1) to form a dimethyl ether injection oil path; A drive valve assembly (9), arranged on the shell body (1) and connected to the drive chamber of the boost valve assembly (2); An oil inlet valve assembly (5) is arranged on the shell body (1), the oil inlet valve assembly (5) is connected to the boosting chamber of the boosting valve assembly (2) through the first directional oil passage (11), and the oil inlet valve assembly (5) is connected to the oil outlet valve assembly (3) through the second directional oil passage (12); a circulation valve assembly (6) disposed on the shell body (1); the circulation valve assembly (6) is connected to the boost valve assembly (2) via the first directional oil passage (11); the circulation valve assembly (6) is connected to the oil outlet valve assembly (3) via the second directional oil passage (12); and the third directional oil passage (13) is connected to the second directional oil passage (12) and the ejector needle injection assembly (4); A purge input valve assembly (7) is arranged on the shell body (1) and is connected to the oil outlet valve assembly (3) and the third directional oil passage (13); A purge output valve assembly (8) is arranged on the shell body (1) and is connected to the oil outlet valve assembly (3) and the third directional oil passage (13).

2. The pressurized dimethyl ether injection device according to claim 1, characterized in that: The oil outlet valve assembly (3) comprises an oil outlet valve body (31), and the oil outlet valve body (31) is provided with a receiving space; The boost valve assembly (2) comprises a boost piston (21), a pressure support rod (22) and a first elastic component (23); the boost piston (21) and the pressure support rod (22) are arranged face to face; the boost chamber is formed between the area between the boost piston (21) and the pressure support rod (22) and the shell body (1); the drive chamber is formed between the outer surface of the boost piston (21) and the shell body (1); the first elastic component (23) is inserted into one end of the pressure support rod (22) away from the boost piston (21); and the first elastic component (23) is arranged on the oil outlet valve body (31).

3. The pressurized dimethyl ether injection device according to claim 2, characterized in that: The first directional oil circuit (11) is connected to the oil inlet valve assembly (5) and the area where the boosting piston (21) and the pressure support rod (22) are arranged face to face, and the first directional oil circuit (11) is connected to the circulation valve assembly (6) and the area where the boosting piston (21) and the pressure support rod (22) are arranged face to face; The second direction oil circuit (12) is connected to the oil inlet valve assembly (5) and the oil outlet valve body (31), and the second direction oil circuit (12) is connected to the circulation valve assembly (6) and the oil outlet valve body (31).

4. The pressurized dimethyl ether injection device according to claim 3, characterized in that: The shell body (1) encloses and forms the first directional oil passage (11) in a conical shape.

5. The pressurized dimethyl ether injection device according to claim 3, characterized in that: The shell body (1) encloses and forms the second direction oil passage (12) in a conical shape.

6. The pressurized dimethyl ether injection device according to claim 3, characterized in that: The shell body (1) encloses and forms the third directional oil passage (13) in a cylindrical shape.

7. The pressurized dimethyl ether injection device according to claim 1, characterized in that: The oil inlet valve assembly (5) comprises an oil inlet valve body (51), a supporting body (52), a T-shaped plug (53), a second elastic component (54) and an oil inlet pipe (55); the oil inlet valve body (51) is buckled on the supporting body (52); the supporting body (52) is buckled on the oil inlet pipe (55); the supporting body (52) is communicated with the oil inlet pipe (55); the second elastic component (54) is sleeved on the supporting body (52); and the T-shaped plug (53) is plugged into the supporting body (52).

8. The pressurized dimethyl ether injection device according to claim 1, characterized in that: The circulation valve assembly (6) comprises a circulation valve body (61), a first conical plug (62), a fourth elastic component (63), a first supporting component (64) and a circulation pipe (65); the supporting component (64) is sleeved on the circulation pipe (65); the supporting component (64) is connected to the circulation pipe (65); the circulation valve body (61) is buckled on the first supporting component (64); the first conical plug (62) is pressed against the first supporting component (64); and the fourth elastic component (63) is sleeved on the first conical plug (62).

9. The pressurized dimethyl ether injection device according to claim 1, characterized in that: The purge input valve assembly (7) comprises a purge input valve body (71), a second conical plug (72), a third elastic component (73), a second supporting component (74) and a nitrogen output pipeline (75); the second supporting component (74) is sleeved on the nitrogen output pipeline (75); the second supporting component (74) is communicated with the nitrogen output pipeline (75); the purge input valve body (71) is buckled on the second supporting component (74); the second conical plug (72) is pressed against the second supporting component (74); and the third elastic component (73) is sleeved on the second conical plug (72).

10. The pressurized dimethyl ether injection device according to claim 1, characterized in that: The purge output valve assembly (8) comprises a purge output pipe (81), a third supporting component (82) and a base (83); the base (83) is arranged on the shell body (1); the third supporting component (82) is pressed against the base (83); and the purge output pipe (81) is plugged into the third supporting component (82).

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