Pressure control valve of ammonia fuel common rail pump

Abstract

The utility model relates to the technical field of engines, in particular to an ammonia fuel common rail pump pressure control valve. The ammonia fuel common rail pump pressure control valve comprises a valve body, a proportion electromagnet, a sliding valve assembly installed in a first cavity of the valve body and an adjusting screw rod installed in a second cavity of the valve body. One end of the adjusting screw extends into the valve body and is connected with the slide valve spring seat; the first cavity and the second cavity are communicated and located on the same central axis, a first annular groove and a second annular groove are formed in the first cavity, the first annular groove and the sliding valve sleeve are matched to form a third cavity, the second annular groove and the sliding valve sleeve are matched to form a fourth cavity, a third annular groove is formed in the second cavity, and the third annular groove and the adjusting screw rod are matched to form a fifth cavity; the cavity where the slide valve spring is located is a sixth cavity, and a seventh cavity is formed at the connecting part of the slide valve matching part and the proportional electromagnet; the adjusting screw is used for adjusting the opening pressure of the sliding valve.

Description

Technical Field

[0001] The utility model relates to the technical field of engines, in particular to a pressure control valve for an ammonia fuel common rail pump. Background Art

[0002] With the gradual weakening of the dominant position of fossil energy such as petroleum and natural gas, clean energy will surely develop rapidly. As a fuel, ammonia mainly produces nitrogen and water during combustion, without carbon emission problems. It is a very clean fuel and has attracted wide attention from countries around the world. It is imperative to develop ammonia fuel engines.

[0003] The common rail fuel injection system has advantages such as flexible injection methods and is widely applied to engines. It is also one of the development directions of the current ammonia engine fuel injection system. The injection pressure of the common rail fuel injection system affects indicators such as injection rate, atomization characteristics, and cyclic injection volume. Therefore, the regulation of injection pressure is a key technology. The proportional valve is one of the key components for regulating injection pressure, making the fuel quantity delivered to the common rail consistent with the system demand and playing a role in regulating the rail pressure. Due to the low viscosity, corrosiveness, toxicity, and easy gas-liquid phase change conversion of ammonia, the fuel proportional valve is not applicable to ammonia fuel, and research needs to be carried out to develop a pressure control valve suitable for the ammonia fuel common rail system.

[0004] Therefore, in view of the above problems, there is an urgent need in the industry for a pressure control valve for an ammonia fuel common rail pump. Content of the Utility Model

[0005] (1) Technical Problems to be Solved

[0006] The technical problem to be solved by the utility model is to provide a pressure control valve for an ammonia fuel common rail pump, and solve the technical problem of how to achieve the injection pressure control of the ammonia fuel common rail system.

[0007] (2) Technical Solutions

[0008] To solve the above technical problems, the utility model provides a pressure control valve for an ammonia fuel common rail pump, which includes a valve body, a proportional electromagnet, a spool assembly installed in the first cavity of the valve body, and an adjusting screw installed in the second cavity of the valve body;

[0009] The spool assembly includes a spool pair, a spool spring, and a spool spring seat. The spool pair includes a spool and a spool sleeve with clearance fit. One end of the adjusting screw extends into the valve body and is connected to the spool spring seat. One end of the spool spring is installed on the spool spring seat, the other end of the spool spring abuts against one end of the spool, the other end of the spool is connected to the push rod of the proportional electromagnet, and the spool sleeve is sleeved on the spool;

[0010] The first cavity communicates with the second cavity and is located on the same central axis. The first cavity is provided with a first annular groove and a second annular groove. The first annular groove and the spool sleeve cooperate to form a third cavity. The second annular groove and the spool sleeve cooperate to form a fourth cavity. The second cavity is provided with a third annular groove. The third annular groove and the adjusting screw cooperate to form a fifth cavity;

[0011] The cavity where the spool spring is located is the sixth cavity, and the connection part between the spool pair and the proportional electromagnet forms a seventh cavity; The adjusting screw is used to adjust the opening pressure of the spool.

[0012] Further, a plurality of V-shaped grooves are provided on the working surface of the spool. The spool is provided with an eighth annular groove. The eighth annular groove and the spool sleeve cooperate to form an eighth cavity; The working surface of the spool is plated with an anti-corrosion and wear-resistant coating.

[0013] Further, the spool sleeve is provided with a middle hole for accommodating the spool. The middle section of the spool sleeve is respectively provided with a plurality of flow control windows evenly distributed in the circumferential direction and a plurality of through holes evenly distributed in the circumferential direction. Each flow control window communicates with the fourth cavity and the eighth cavity, and each through hole communicates with the eighth cavity and the third cavity.

[0014] Further, the flow control window includes a first rectangular window and a second rectangular window. The width of the first rectangular window is narrower than the width of the second rectangular window. The first rectangular window is arranged on the side close to the proportional electromagnet. The first rectangular window and the second rectangular window are transitioned through a conical window; Among them,

[0015] When the engine fuel injection system is in normal operation, the first rectangular window is the adjustment area. The spool axially moves within the range of the first rectangular window to achieve the rail pressure adjustment of various working conditions of the ammonia fuel engine, and the second rectangular window and the conical window are not used;

[0016] When the engine fuel injection system encounters an abnormal condition and needs to release the rail pressure by a set amplitude, the spool moves to the maximum lift position. At this time, the first rectangular window, the second rectangular window and the conical window are all completely opened.

[0017] Further, a ninth annular groove is provided at one end of the spool sleeve close to the maximum outer circle. The ninth annular groove and the valve body cooperate to form a ninth cavity; A plurality of through holes evenly distributed in the circumferential direction and communicating the ninth cavity and the seventh cavity are provided at one end of the spool sleeve close to the maximum outer circle.

[0018] Further, a feed hole for communicating the fourth cavity with the external space is formed in the valve body. A fourth annular groove for communicating with a leakage fuel collection tank and a fifth annular groove for installing a sealing ring are formed in one side of the valve body where the feed hole is located.

[0019] The valve body is provided with a discharge interface for connecting a fuel delivery pipe, and the discharge interface is communicated with the third cavity, the sixth cavity, and the ninth cavity respectively; the fifth cavity is communicated with the fourth annular groove; sixth and seventh annular grooves for installing sealing rings are formed on both sides of the adjusting screw rod located in the third annular groove, and a sealing ring is provided at the opening of the first cavity.

[0020] Further, the fourth cavity is communicated with the high-pressure end of an ammonia fuel high-pressure pump and is used for storing high-pressure ammonia fuel, and the eighth cavity is communicated with an ammonia fuel storage tank, and low-pressure ammonia fuel is stored in the eighth cavity.

[0021] When the proportional electromagnet is powered off, the spool completely blocks the flow control window, and the high-pressure ammonia fuel in the fourth cavity cannot flow into the eighth cavity through the flow control window.

[0022] When the proportional electromagnet is powered on, the push rod of the proportional electromagnet drives the spool to move axially to change the flow area of the ammonia fuel in the flow control window, and adjusts the discharge amount of the high-pressure ammonia fuel in the high-pressure pump to adjust the rail pressure of each working condition of the ammonia fuel engine.

[0023] Further, the third cavity, the sixth cavity, the seventh cavity, and the eighth cavity are communicated with each other and the ammonia fuel has back pressure to ensure that the high-pressure ammonia fuel does not vaporize after leaking from the gap of the spool pair into the third cavity, the sixth cavity, the seventh cavity, and the eighth cavity.

[0024] Further, the spool sleeve and the valve body are in interference fit. Two seals are provided on the high-pressure sealing plane of the valve body connected to the high-pressure pump. The inner ring is a high-pressure sealing ring belt, and the outer ring is a sealing ring. The fourth annular groove is located between the inner ring and the outer ring.

[0025] Further, the valve body, the proportional electromagnet, the adjusting screw rod, the spool pair, the spool spring, and the spool spring seat are all made of ammonia corrosion-resistant materials.

[0026] (III) Beneficial effects

[0027] The above technical solutions of the present utility model have the following advantages:

[0028] The pressure control valve of the ammonia fuel common rail pump of the present utility model controls the pressure by adjusting the flow rate discharged internally from the spool through an adjusting screw, can adapt to ammonia fuel, can withstand high pressure, and has good sensitivity, stability, reliability, safety and service life. Brief Description of the Drawings

[0029] Figure 1 It is a schematic structural view of the pressure control valve of the ammonia fuel common rail pump of the present utility model;

[0030] Figure 2 It is a partial cross-sectional view of the pressure control valve of the ammonia fuel common rail pump of the present utility model;

[0031] Figure 3 It is a schematic structural view of the valve body in the pressure control valve of the ammonia fuel common rail pump of the present utility model;

[0032] Figure 4 It is a schematic structural view of the spool pair in the valve body of the present utility model;

[0033] Figure 5 It is a schematic structural view of the spool in the spool pair of the present utility model;

[0034] Figure 6 It is a schematic structural view of the spool sleeve in the spool pair of the present utility model;

[0035] Figure 7 It is a schematic structural view of the flow control window in the spool sleeve of the present utility model;

[0036] In the figure: 1-valve body; 11-first annular groove; 12-second annular groove; 13-third annular groove; 14-feed hole; 15-fourth annular groove; 16-fifth annular groove; 17-discharge interface; 18-sixth annular groove; 19-seventh annular groove; 20-communication hole; 2-proportional electromagnet; 3-adjusting screw; 4-spool pair; 41-spool; 411-V-shaped groove; 412-eighth annular groove; 42-spool sleeve; 421-middle hole; 422-flow control window; 4221-first rectangular window; 4222-second rectangular window; 4223-third rectangular window; 423-through hole; 424-ninth annular groove; 5-spool spring; 6-spool spring seat; A-first cavity; B-second cavity; C-third cavity; D-fourth cavity; E-fifth cavity; F-sixth cavity; G-seventh cavity; H-eighth cavity; I-ninth cavity. Detailed Embodiments

[0037] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0038] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0039] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0040] See Figures 1 to 6 , the present utility model provides an ammonia fuel common rail pump pressure control valve, which includes a valve body 1, a proportional electromagnet 2, a spool assembly installed in the first cavity A of the valve body 1, and an adjusting screw 3 installed in the second cavity B of the valve body 1. The spool assembly includes a spool pair 4, a spool spring 5, and a spool spring seat 6. The spool pair 4 includes a spool 41 and a spool sleeve 42 with a clearance fit. One end of the adjusting screw 3 extends into the valve body 1 and is connected to the spool spring seat 6. One end of the spool spring 5 is installed on the spool spring seat 6, the other end of the spool spring 5 abuts against one end of the spool 41, the other end of the spool 41 is connected to the push rod of the proportional electromagnet 2, and the spool sleeve 42 is sleeved on the spool 41. The first cavity A communicates with the second cavity B and is located on the same central axis. The first cavity A is provided with a first annular groove 11 and a second annular groove 12. The first annular groove 11 and the spool sleeve 42 cooperate to form a third cavity C, and the second annular groove 12 and the spool sleeve 42 cooperate to form a fourth cavity D. The second cavity B is provided with a third annular groove 13, and the third annular groove 13 and the adjusting screw 3 cooperate to form a fifth cavity E. The cavity where the spool spring 5 is located is the sixth cavity F, and the connection part between the spool pair 4 and the proportional electromagnet 2 forms a seventh cavity G; the adjusting screw 3 is used to adjust the opening pressure of the spool 41.

[0041] In the above embodiment, by adjusting the discharged flow rate to control the pressure, it can adapt to ammonia fuel, can withstand high pressure, and has good sensitivity, stability, reliability, safety, and service life.

[0042] As an alternative embodiment, asFigure 2 and 5 As shown in 5 , multiple V-shaped grooves 411 are provided on the working surface of the spool valve 41. The spool valve 41 is provided with an eighth annular groove 412, and the eighth annular groove 412 and the spool valve sleeve 42 cooperate to form an eighth cavity H. The working surface of the spool valve 41 is plated with an anti-corrosion and wear-resistant coating. Among them, multiple "V"-shaped grooves are designed on the working surface of the spool valve 41. The viscosity of ammonia is low, which can improve the self-lubrication effect of the spool valve pair and reduce the leakage of high-pressure ammonia fuel in the clearance of the spool valve pair. At the same time, the working surface of the spool valve 41 is plated with a coating with anti-corrosion, wear resistance, and low friction coefficient. The viscosity of ammonia is low and it has corrosiveness, which can improve the corrosion resistance, wear resistance, and anti-sticking ability of the spool valve.

[0043] As an alternative implementation, as Figure 6 shown in Figure 6 , the spool valve sleeve 42 is provided with a middle hole 421 for accommodating the spool valve 41. Multiple flow control windows 422 evenly distributed in the circumferential direction and multiple through holes 423 evenly distributed in the circumferential direction are respectively provided in the middle section of the spool valve sleeve 42. Each flow control window 422 communicates with the fourth cavity D and the eighth cavity H, and each through hole 423 communicates with the eighth cavity H and the third cavity C.

[0044] As an alternative implementation, as Figure 7 shown in Figure 7 , the flow control window 422 includes a first rectangular window 4221 and a second rectangular window 4222. The width of the first rectangular window 4221 is narrower than the width of the second rectangular window 4222. The first rectangular window 4221 is arranged on the side close to the proportional electromagnet 2, and the first rectangular window 4221 and the second rectangular window 4222 are transitioned through a tapered window 4223.

[0045] When the engine fuel injection system is in normal operation, the first rectangular window 4221 is the adjustment area, and the spool valve 41 axially moves within the range of the first rectangular window 4221 to achieve the rail pressure adjustment of various working conditions of the ammonia fuel engine, and the second rectangular window 4222 and the tapered window 4223 are not used;

[0046] When the engine fuel injection system encounters an abnormal condition and needs to relieve the rail pressure by a set amplitude, the spool valve 41 moves to the maximum lift position. At this time, the first rectangular window 4221, the second rectangular window 4222, and the tapered window 4223 are all fully opened.

[0047] It should be noted here that in addition to the first rectangular window 4221 designed for normal flow regulation, the flow control window 422 is also designed with a second rectangular window 4222 and a conical window 4223. When the engine fuel injection system is operating normally, the axial movement of the spool valve 41 within the range of the first rectangular window 4221 can meet the rail pressure regulation requirements of various operating conditions of the ammonia fuel engine, and the second rectangular window 4222 and the conical window 4223 will not be used. When the engine fuel injection system encounters an abnormal situation and needs to significantly relieve the rail pressure, the spool valve 41 can move to the maximum lift position. At this time, the first rectangular window 4221, the second rectangular window 4222, and the conical window 4223 are all fully opened, and the ammonia fuel flow area reaches the maximum. The second rectangular window 4222 and the conical window 4223 are also beneficial to the machining of the first rectangular window 4221 with a relatively narrow width.

[0048] As an alternative implementation, as Figure 6 shown, a ninth annular groove 424 is provided at one end of the spool valve sleeve 42 close to the maximum outer diameter. The ninth annular groove 424 and the valve body 1 cooperate to form a ninth cavity I. A plurality of through holes are provided at one end of the spool valve sleeve 42 close to the maximum outer diameter, which are evenly distributed in the circumferential direction and communicate the ninth cavity I and the seventh cavity G.

[0049] As an alternative implementation, as Figure 3 shown, the valve body 1 is provided with a feed hole 14 for communicating the fourth cavity D with the external space. On the side of the valve body 1 having the feed hole 14, a fourth annular groove 15 for communicating with the leakage fuel collection tank and a fifth annular groove 16 for installing a sealing ring are provided. The valve body 1 is provided with a discharge interface 17 for connecting a fuel delivery pipe. The discharge interface 17 communicates with the third cavity C, the sixth cavity F, and the ninth cavity I respectively. The fifth cavity E communicates with the fourth annular groove 15. The adjusting screw 3 is provided with a sixth annular groove 18 and a seventh annular groove 19 for installing sealing rings on both sides of the third annular groove 13, and a sealing ring is provided at the opening of the first cavity A.

[0050] Specifically, the discharge interface 17 communicates with the third cavity C, the sixth cavity F, and the ninth cavity I respectively through corresponding communication holes 20. The fifth cavity E also communicates with the fourth annular groove 15 through the communication hole 20. The adjusting screw 3 is also designed with two seals, including the sixth annular groove 18 and the seventh annular groove 19. The third annular groove 13 communicating with the leakage fuel collection tank is between the two annular grooves. If the sealing ring in the sixth annular groove 18 fails, the abnormally leaked ammonia fuel will enter the third annular groove 13 and finally flow into the leakage fuel collection tank to prevent the ammonia fuel from leaking into the external environmental space.

[0051] As an alternative embodiment, the fourth cavity D is connected to the high-pressure end of the ammonia fuel high-pressure pump and is used to store high-pressure ammonia fuel. The eighth cavity H is connected to the ammonia fuel storage tank, and low-pressure ammonia fuel is stored in the eighth cavity H. Wherein, when the proportional electromagnet 2 is powered off, the slide valve 41 completely blocks the flow control window 422, and the high-pressure ammonia fuel in the fourth cavity D cannot flow into the eighth cavity H through the flow control window 422; when the proportional electromagnet 2 is powered on, the push rod of the proportional electromagnet 2 drives the slide valve 41 to move axially to change the flow area of the ammonia fuel in the flow control window 422, and adjusts the discharge amount of the high-pressure ammonia fuel in the high-pressure pump to adjust the rail pressure of each working condition of the ammonia fuel engine. This method can avoid the vaporization of liquid ammonia in the common rail pump.

[0052] As an alternative embodiment, as Figure 2 shown, the third cavity C, the sixth cavity F, the seventh cavity G and the eighth cavity H are interconnected and the ammonia fuel has a back pressure to ensure that the high-pressure ammonia fuel does not vaporize after leaking from the gap of the slide valve pair 4 into the third cavity C, the sixth cavity F, the seventh cavity G and the eighth cavity H. Preferably, the back pressure is 1 to 5 MPa; in addition, the back pressure can also prevent the ammonia fuel discharged from the flow control window 422 from vaporizing and can always remain in a liquid state and flow back to the ammonia fuel storage tank.

[0053] As an alternative embodiment, as Figure 2 shown, the slide valve sleeve 42 is in interference fit with the valve body 1. The valve body 1 is provided with two seals on the high-pressure sealing plane connected to the high-pressure pump. The inner ring is a high-pressure sealing ring belt, and the outer ring is a sealing ring. The fourth annular groove 15 is located between the inner ring and the outer ring. Among them, the slide valve sleeve 42 and the valve body 1 are in interference fit to prevent the high-pressure ammonia fuel from leaking between the slide valve sleeve 42 and the valve body 1. If the inner ring plane seal fails, the abnormally leaked ammonia fuel will enter the fourth annular groove 15 and finally flow into the leakage fuel collection tank to prevent the ammonia fuel from leaking into the external environmental space.

[0054] As an alternative embodiment, the valve body 1, the proportional electromagnet 2, the adjusting screw 3, the slide valve pair 4, the slide valve spring 5 and the slide valve spring seat 6 are all made of ammonia corrosion-resistant materials.

[0055] Specifically, the valve body 1, the proportional electromagnet 2, the adjusting screw 3, the slide valve pair 4, the slide valve spring 5, the slide valve spring seat 6, the sealing ring and the plug head and other parts in contact with ammonia are all made of ammonia corrosion-resistant materials, ensuring the reliability of the pressure control valve.

[0056] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and modifications can be made, and these improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. An ammonia fuel common rail pump pressure control valve, characterized in that: It comprises a valve body (1), a proportional solenoid (2), a slide valve assembly installed in a first cavity (A) of the valve body (1), and an adjusting screw (3) installed in a second cavity (B) of the valve body (1); The slide valve assembly comprises a slide valve pair (4), a slide valve spring (5) and a slide valve spring seat (6); the slide valve pair (4) comprises a slide valve (41) and a slide valve sleeve (42) with clearance fit; one end of the adjusting screw (3) extends into the valve body (1) and is connected to the slide valve spring seat (6); one end of the slide valve spring (5) is mounted on the slide valve spring seat (6); the other end of the slide valve spring (5) abuts against one end of the slide valve (41); the other end of the slide valve (41) is connected to the push rod of the proportional solenoid (2); and the slide valve sleeve (42) is sleeved on the slide valve (41); The first cavity (A) is connected to the second cavity (B) and is located on the same central axis. The first cavity (A) is provided with a first annular groove (11) and a second annular groove (12). The first annular groove (11) cooperates with the slide valve sleeve (42) to form a third cavity (C). The second annular groove (12) cooperates with the slide valve sleeve (42) to form a fourth cavity (D). The second cavity (B) is provided with a third annular groove (13). The third annular groove (13) cooperates with the adjusting screw (3) to form a fifth cavity (E). The cavity where the slide valve spring (5) is located is the sixth cavity (F), and the connection portion between the slide valve pair (4) and the proportional electromagnet (2) forms a seventh cavity (G); the adjusting screw (3) is used to adjust the opening pressure of the slide valve (41).

2. The ammonia fuel common rail pump pressure control valve according to claim 1, characterized in that: The working surface of the slide valve (41) is provided with a plurality of V-shaped grooves (411), the slide valve (41) is provided with an eighth annular groove (412), and the eighth annular groove (412) cooperates with the slide valve sleeve (42) to form an eighth cavity (H); the working surface of the slide valve (41) is plated with an anti-corrosion and wear-resistant coating.

3. The ammonia fuel common rail pump pressure control valve according to claim 2, characterized in that: The sliding valve sleeve (42) is provided with a central hole (421) for accommodating the sliding valve (41); a middle section of the sliding valve sleeve (42) is provided with a plurality of flow control windows (422) evenly distributed along the circumference and a plurality of through holes (423) evenly distributed along the circumference; each of the flow control windows (422) is connected to the fourth cavity (D) and the eighth cavity (H); and each of the through holes (423) is connected to the eighth cavity (H) and the third cavity (C).

4. The ammonia fuel common rail pump pressure control valve according to claim 3, characterized in that: The flow control window (422) comprises a first rectangular window (4221) and a second rectangular window (4222); the width of the first rectangular window (4221) is narrower than the width of the second rectangular window (4222); the first rectangular window (4221) is arranged on a side close to the proportional electromagnet (2); and a tapered window (4223) is provided to transition between the first rectangular window (4221) and the second rectangular window (4222); wherein, When the engine fuel injection system is in normal operation, the first rectangular window (4221) is the adjustment area, and the slide valve (41) moves axially within the range of the first rectangular window (4221) to achieve rail pressure adjustment in various operating conditions of the ammonia fuel engine, and the second rectangular window (4222) and the conical window (4223) are not used; When the engine fuel injection system encounters an abnormal condition and needs to release the rail pressure at a set amplitude, the slide valve (41) moves to the maximum lift position, at which time the first rectangular window (4221), the second rectangular window (4222) and the conical window (4223) are all fully opened.

5. The ammonia fuel common rail pump pressure control valve according to claim 1, characterized in that: A ninth annular groove (424) is formed at one end of the sliding valve sleeve (42) close to the largest outer circle, and the ninth annular groove (424) cooperates with the valve body (1) to form a ninth cavity (I); a plurality of through holes are formed at one end of the sliding valve sleeve (42) close to the largest outer circle, and are evenly distributed along the circumferential direction and connect the ninth cavity (I) and the seventh cavity (G).

6. The ammonia fuel common rail pump pressure control valve according to claim 5, characterized in that: The valve body (1) is provided with a feed hole (14) for connecting the fourth cavity (D) with the external space, and the valve body (1) is provided with a fourth annular groove (15) for connecting with the leaked fuel collection tank and a fifth annular groove (16) for installing a sealing ring on a side with the feed hole (14); The valve body (1) is provided with a discharge interface (17) for connecting to a fuel delivery pipe, and the discharge interface (17) is respectively connected to the third cavity (C), the sixth cavity (F), and the ninth cavity (I); the fifth cavity (E) is connected to the fourth annular groove (15); the adjusting screw (3) is provided with a sixth annular groove (18) and a seventh annular groove (19) for installing a sealing ring on both sides of the third annular groove (13), and a sealing ring is provided at the opening of the first cavity (A).

7. The ammonia fuel common rail pump pressure control valve according to claim 3, characterized in that: The fourth cavity (D) is connected to the high-pressure end of the ammonia fuel high-pressure pump and is used to store the high-pressure ammonia fuel. The eighth cavity (H) is connected to the ammonia fuel storage tank, and the eighth cavity (H) stores the low-pressure ammonia fuel. When the proportional solenoid (2) is powered off, the slide valve (41) completely blocks the flow control window (422), and the high-pressure ammonia fuel in the fourth cavity (D) cannot flow into the eighth cavity (H) through the flow control window (422); When the proportional electromagnet (2) is energized, the push rod of the proportional electromagnet (2) drives the slide valve (41) to move axially to change the flow area of ​​the ammonia fuel in the flow control window (422), and adjust the discharge volume of the high-pressure ammonia fuel in the high-pressure pump to adjust the rail pressure of the ammonia fuel engine in various working conditions.

8. The ammonia fuel common rail pump pressure control valve according to claim 2, characterized in that: The third cavity (C), the sixth cavity (F), the seventh cavity (G) and the eighth cavity (H) are interconnected and the ammonia fuel has a back pressure to ensure that the high-pressure ammonia fuel does not vaporize after leaking from the gap of the sliding valve pair (4) to the third cavity (C), the sixth cavity (F), the seventh cavity (G) and the eighth cavity (H).

9. The ammonia fuel common rail pump pressure control valve according to claim 6, characterized in that: The sliding valve sleeve (42) is interference fit with the valve body (1); the valve body (1) is provided with two seals on a high-pressure sealing plane connected to a high-pressure pump, the inner ring being a high-pressure sealing ring belt and the outer ring being a sealing ring; the fourth ring groove (15) is located between the inner ring and the outer ring.

10. The ammonia fuel common rail pump pressure control valve according to any one of claims 1 to 9, characterized in that: The valve body (1), the proportional solenoid (2), the adjusting screw (3), the sliding valve pair (4), the sliding valve spring (5) and the sliding valve spring seat (6) are all made of ammonia corrosion-resistant materials.

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