High-pressure liquid ammonia pump

Abstract

The utility model discloses a high-pressure liquid ammonia pump which comprises a pump body and a pressurizing mechanism, the pump body is provided with at least one pump head, the pump head is provided with a plunger cavity, a liquid inlet channel, a liquid outlet channel and a cooling channel, and an expansion valve is arranged between the cooling channel and the liquid inlet channel; the pressurizing mechanism comprises at least one plunger body and a driving assembly, the plunger body is movably arranged in the plunger cavity to form a pump pressure chamber, the pump pressure chamber communicates with the liquid inlet channel and the liquid outlet channel, and the driving assembly is configured to drive the plunger body to move in the plunger cavity so as to change the volume of the pump pressure chamber. According to the liquid ammonia pump, part of liquid ammonia in the liquid inlet channel serves as a refrigerant, cooling of the liquid ammonia pump is achieved through the characteristic that latent heat of ammonia gasification is large, no extra cooling assembly needs to be arranged, the overall size is reduced, the overall structure is made to be compact, manufacturing cost is reduced, and temperature control efficiency and cooling effect are improved.

Description

Technical Field

[0001] The utility model relates to the field of high-pressure liquid ammonia supply for an ammonia internal combustion engine, in particular to a high-pressure liquid ammonia pump. Background Art

[0002] Ammonia contains no carbon and three hydrogen atoms, making it an excellent hydrogen carrier. It also has a melting point of -77°C, a boiling point of -33°C, and can be liquefied at approximately 10 bar at 25°C, making it relatively easy to store and transport. It can be synthesized using green electricity and is considered a promising zero-carbon fuel. Consequently, the research and application of ammonia internal combustion engines are of great value. Ammonia internal combustion engines are still in the research stage. Direct injection of liquid ammonia into the cylinder requires pressures of hundreds or even thousands of bar. Ammonia internal combustion engines are equipped with high-pressure ammonia pumps to provide this high-pressure ammonia supply. Due to their compact structure and ease of driving and controlling, high-pressure ammonia pumps are located on the engine body. However, due to metal-to-metal contact conduction, lubricating oil conduction, heat radiation, and efficiency losses during pump operation, the pump's operating temperature increases, leading to ammonia temperature within the pump. If the supply pressure falls below the saturated vapor pressure, a phase change occurs, causing ammonia to vaporize within the pump, resulting in gas binding and preventing liquid discharge. Although some pump structures capable of cooling have emerged on the market, they require additional cooling components, resulting in a large overall size, increased manufacturing costs, low temperature control efficiency, and poor cooling performance. Utility Model Content

[0003] The purpose of the utility model is to provide a high-pressure liquid ammonia pump that does not rely on external resources, does not require power for the cooling system, has low product cost, good cooling effect, and a compact structure, so as to solve one or more technical problems existing in the prior art and at least provide a beneficial choice or create conditions.

[0004] The technical solutions adopted to solve the above technical problems are:

[0005] The utility model provides a high-pressure liquid ammonia pump, comprising:

[0006] The pump body is provided with at least one pump head, the pump head is provided with a plunger cavity, a liquid inlet channel, a liquid outlet channel, and a cooling channel, and an expansion valve is provided between the cooling channel and the liquid inlet channel;

[0007] The pressurizing mechanism includes at least one plunger body and a driving assembly. The plunger body is movably arranged in the plunger cavity to form a pumping chamber. The pumping chamber is connected to the liquid inlet channel and the liquid outlet channel respectively. The driving assembly is configured to drive the plunger body to move in the plunger cavity to change the volume of the pumping chamber.

[0008] The beneficial effects of the high-pressure liquid ammonia pump of the utility model are:

[0009] When in use, the driving assembly drives the plunger body to move in the plunger cavity, changing the volume of the pump pressure chamber. During the downward process of the plunger body, the volume of the pump pressure chamber increases, the indoor pressure decreases, and the liquid ammonia flows into the pump pressure chamber through the liquid inlet channel. During the upward process of the plunger body, the volume of the pump pressure chamber decreases, forming high pressure, and the high-pressure liquid ammonia is pumped out through the liquid outlet channel to realize the pressurized pumping of the liquid ammonia by the pump pressure chamber. At the same time, the liquid ammonia in the liquid inlet channel passes through the expansion valve, which allows the liquid ammonia to pass through its throttling and vaporize and absorb heat in the cooling channel to absorb the heat of the pump head, thereby achieving a cooling effect and lowering the operating temperature of the pump head. It can effectively avoid the problem of gas binding and inability to discharge liquid caused by flash boiling when the liquid ammonia flows through the liquid inlet channel, the plunger cavity and the liquid outlet channel. The utility model adopts a part of the liquid ammonia in the liquid inlet channel as the refrigerant, and realizes the cooling of the liquid ammonia pump by taking advantage of the large latent heat of ammonia vaporization. There is no need to configure an additional cooling component, which reduces the overall volume, makes the overall structure compact, reduces manufacturing cost, and improves temperature control efficiency and cooling effect.

[0010] As a further improvement of the above technical solution, a liquid inlet control valve is provided between the liquid inlet channel and the pump pressure chamber.

[0011] As a further improvement of the above technical solution, the opening of the expansion valve solenoid valve can be adjusted, and the closing time of the liquid inlet solenoid valve can be set, thereby adjusting the flow rate of the plunger pump.

[0012] As a further improvement of the above technical solution, the liquid outlet channel is provided with a one-way valve with a flow direction from the pump pressure chamber to the liquid outlet channel, and the one-way valve is configured to open when the pressure on the inlet side of the one-way valve is greater than a first preset value to connect the liquid outlet channel.

[0013] As a further improvement of the above technical solution, the one-way valve is connected in parallel with a pressure relief valve, and the pressure relief valve is configured to connect the liquid outlet channel with the pump pressure chamber when the outlet side pressure of the one-way valve is greater than a second preset value, and then relieve pressure to the liquid inlet channel when the liquid inlet control valve is opened.

[0014] As a further improvement of the above technical solution, the cooling channel has a wall heat exchange relationship with the plunger cavity, the liquid inlet channel, and the liquid outlet channel respectively.

[0015] As a further improvement of the above technical solution, the cooling channel is arranged around the outer circumference of the plunger cavity.

[0016] As a further improvement of the above technical solution, the inlet of the liquid inlet channel, the outlet of the liquid outlet channel and the outlet of the cooling channel are all provided with connectors.

[0017] As a further improvement of the above technical solution, the end of the plunger body away from the pump pressure chamber is connected to a coaxially arranged connecting rod, the connecting rod is connected to the limiting block, and the connecting rod sleeve is provided with a reset spring, and the two ends of the reset spring act on the pump head and the limit block respectively.

[0018] As a further improvement of the above technical solution, the drive assembly includes a camshaft and at least one cam body, at least one cam body is fixedly connected to the camshaft, the outer periphery of the cam body abuts against the limit block, and the cam body can be arranged with one or more cams in the circumferential direction as needed, and the lift and the speed of change of the lift with the rotation angle can be designed in a diversified manner.

[0019] Other features and advantages of the present invention will be set forth in the following description, and in part will become apparent from the description, or may be understood by practicing the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Figure 1 This is a structural diagram of an embodiment of the high-pressure liquid ammonia pump provided by the present utility model;

[0022] Figure 2 yes Figure 1 A partial enlarged view of the liquid outlet channel;

[0023] Figure Number:

[0024] Pump body 100; pump head 110; plunger cavity 111; liquid inlet channel 112; liquid outlet channel 113; bypass pipe 1131; cooling channel 114; pump pressure chamber 115; expansion valve 116; liquid inlet control valve 117; one-way valve 118; pressure relief valve 119; connector 120;

[0025] Pressurizing mechanism 200 ; plunger body 210 ; connecting rod 211 ; limit block 212 ; driving assembly 220 ; cam shaft 221 ; cam body 222 ; return spring 230 . DETAILED DESCRIPTION

[0026] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0027] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0028] In the description of the present invention, if there are words such as "several", it means one or more, and "more" means more than two. Greater than, less than, and exceed are understood to exclude the number itself, and above, below, and within are understood to include the number itself.

[0029] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0030] Ammonia does not contain carbon and has three hydrogen atoms, making it a good hydrogen-carrying medium; it has a melting point of -77°C, a boiling point of -33°C, and can be liquefied at a pressure of about 10 bar at 25°C, making it easier to store and transport; it can be synthesized using green electricity and is considered a promising zero-carbon fuel, and therefore has important value in the research and application of ammonia internal combustion engines. Ammonia internal combustion engines are still in the research stage, and the direct injection of liquid ammonia into the cylinder requires a pressure of hundreds or even thousands of bars.

[0031] Due to the compactness of the structure and the convenience of driving and control, the high-pressure ammonia pump is arranged on the engine body. However, due to the metal contact conduction of the engine, lubricating oil conduction, heat radiation and the efficiency loss of the pump itself during operation, the pump operating temperature increases, and the ammonia temperature in the pump also increases accordingly. If the supply end pressure is lower than the saturated vapor pressure, a phase change occurs, and the ammonia is vaporized in the pump, resulting in the so-called gas binding phenomenon, and liquid cannot be discharged.

[0032] Industrial liquid ammonia pumps are driven by AC motors, are large in size, have low pressure, and are difficult to link with the engine, which does not meet the requirements for use in internal combustion engines. Traditional internal combustion engine high-pressure fuel pumps are plunger pumps, which have the advantages of high rated pressure, compact structure, high efficiency and convenient flow adjustment. However, they do not meet the requirements for ammonia use in terms of inlet pressure resistance, materials and operating temperature. At present, there are no high-pressure fuel pumps suitable for use in ammonia internal combustion engines.

[0033] Although some pump structures that can achieve cooling have appeared on the market, they all require additional cooling components, resulting in a large overall volume, increased manufacturing costs, low temperature control efficiency, and poor cooling effect.

[0034] The utility model takes into account that ammonia has a large latent heat of vaporization and is a good refrigerant, which is widely used in industrial refrigeration. The utility model further proposes a high-pressure liquid ammonia pump, which is applied to ammonia engines. Cooling is achieved by absorbing heat through the vaporization of ammonia, without relying on external resources. The cooling system does not require power, has low product cost, good cooling effect, and compact structure.

[0035] like Figure 1 As shown, the high-pressure liquid ammonia pump of the embodiment of the present invention includes a pump body 100 and a pressurizing mechanism 200 .

[0036] The pump body 100 is provided with at least one pump head 110 , which may have various structures and arrangements depending on the application. Based on this principle, it can be expanded into a multi-cylinder pump, or even without a pump body 100 , and integrated into the engine body. In some embodiments, a pump body 100 may have multiple pump heads 110 .

[0037] Among them, the pump head 110 is provided with a plunger cavity 111, a liquid inlet channel 112, a liquid outlet channel 113 and a cooling channel 114. The liquid inlet channel 112 is connected to the external liquid ammonia supply pipeline to realize the supply of liquid ammonia, and the liquid outlet channel 113 is connected to the nozzle or ammonia rail of the engine to transport the pressurized liquid ammonia to the engine for combustion.

[0038] The cooling channel 114 is mainly used to cool the pump head 110. The cooling channel 114 can be set in the pump head 110, the pump body 100, the liquid inlet channel 112 or multiple parts, or can even be an independent component. The channel size is calculated according to the cooling requirements and is flexibly designed according to the specific supporting model, while taking into account the function, performance, manufacturing, cost and quality.

[0039] An expansion valve 116 is provided between the cooling channel 114 and the liquid inlet channel 112. Depending on the product layout, the expansion valve 116 can be integrated into the pump head 110 or arranged independently. In particular, a multi-cylinder pump has multiple pump heads 110. The independently arranged expansion valve 116 can be shared by multiple cylinders to reduce costs.

[0040] The liquid ammonia in the liquid inlet channel 112 passes through the expansion valve 116, which allows the liquid ammonia to pass through its throttling and vaporize and absorb heat in the cooling channel 114 to absorb the heat of the pump head 110, thereby achieving a cooling effect and lowering the operating temperature of the pump head 110. This can effectively avoid the problem of gas binding and inability to discharge liquid caused by flash boiling when the liquid ammonia flows through the liquid inlet channel 112, the plunger cavity 111 and the liquid outlet channel 113.

[0041] The pressurizing mechanism 200 of the embodiment of the present invention includes at least one plunger body 210 and a driving assembly 220. The number of the plunger bodies 210 is determined according to the number of the pump heads 110. The plunger body 210 is sealed and movably arranged in the plunger cavity 111. The plunger body 210 and the top of the plunger cavity 111 form a pumping chamber 115. The pumping chamber 115 is respectively connected to the liquid inlet channel 112 and the liquid outlet channel 113. The driving assembly 220 is configured to drive the plunger body 210 to move in the plunger cavity 111 to change the volume of the pumping chamber 115.

[0042] During the downward movement of the plunger body 210, the volume of the pumping chamber 115 increases and the pressure decreases, and the liquid ammonia flows into the pumping chamber 115 through the liquid inlet channel 112. During the upward movement of the plunger body 210, the volume of the pumping chamber 115 decreases, forming high pressure, which squeezes the liquid ammonia. The high-pressure liquid ammonia is pumped out through the liquid outlet channel 113, thereby realizing the pressurized pumping of the liquid ammonia by the pumping chamber 115.

[0043] Among them, the cooling channel 114 has a wall heat exchange relationship with the plunger cavity 111, the liquid inlet channel 112, and the liquid outlet channel 113 respectively. When the liquid ammonia in the cooling channel 114 is vaporized, it will also exchange heat with the liquid ammonia in the plunger cavity 111, the liquid inlet channel 112, and the liquid outlet channel 113. While cooling the pump head 110, the liquid ammonia is also cooled to prevent the temperature of the liquid ammonia from being too high.

[0044] In the embodiment of the present invention, considering that liquid ammonia is squeezed in the plunger cavity 111 and generates relatively large amounts of heat, the present invention arranges a cooling channel 114 around the outer circumference of the plunger cavity 111 to improve the cooling effect of the plunger cavity 111 .

[0045] Furthermore, a liquid inlet control valve 117 is provided between the liquid inlet channel 112 and the pump pressure chamber 115. The liquid inlet control valve 117 is used to control the flow rate of the pump. The closing moment of the liquid inlet control valve 117 is adjusted according to the amount required by the ammonia engine. The liquid inlet control valve 117 of this embodiment is a solenoid valve, which can close the liquid inlet channel 112 according to instructions and lock it by hydraulic force.

[0046] The liquid outlet channel 113 of the embodiment of the present invention is provided with a one-way valve 118. The flow direction of the one-way valve 118 is from the pump pressure chamber 115 to the liquid outlet channel 113. The one-way valve 118 is configured to open when the pressure on the inlet side of the one-way valve 118 is greater than a first preset value to connect the liquid outlet channel 113. During the upward movement of the plunger body 210, when the ammonia liquid is pressurized to the pressure of the first preset value, the one-way valve 118 opens and the high-pressure ammonia is pumped out. When the plunger body 210 has not reached the set pressure during the upward movement, the one-way valve 118 is in a closed state. When the plunger body 210 descends, the liquid ammonia will not flow back through the one-way valve 118. The suction force generated by the downward movement of the plunger body 210 is only used to extract the liquid ammonia in the liquid inlet channel 112.

[0047] Furthermore, in actual operation, high-pressure liquid ammonia will be intermittently pumped into the nozzle and the ammonia rail along the liquid outlet channel 113. When the nozzle and the ammonia rail are over-pressured, if ammonia is continued to be added, the nozzle or the ammonia rail will be damaged. In order to protect the rear nozzle and the ammonia rail, Figure 2 As shown, the one-way valve 118 of the embodiment of the present invention is connected in parallel with the pressure relief valve 119. It can be understood that a bypass pipe 1131 is provided in the liquid outlet channel 113, and both ends of the bypass pipe 1131 are respectively connected to the two end sides of the one-way valve 118. The pressure relief valve 119 is installed in the bypass pipe 1131. The pressure relief flow direction of the pressure relief valve 119 is set opposite to the flow direction of the one-way valve 118. The high-pressure liquid ammonia in the pump pressure chamber 115 is pumped out through the one-way valve 118, and the liquid ammonia in the engine flows back to the pump pressure chamber 115 from the pressure relief valve 119.

[0048] Furthermore, the pressure relief valve 119 of the embodiment of the present invention is configured to open when the pressure on the outlet side of the one-way valve 118 is greater than a second preset value, so that the liquid outlet channel 113 is connected to the pump pressure chamber 115. It can be understood that when the liquid ammonia pressure in the nozzle and the ammonia rail in the engine is higher than the second preset value, the pressure relief valve 119 opens to relieve the pressure of the liquid ammonia in the nozzle and the ammonia rail. Then, when the high-pressure end pressure exceeds the set pressure of the pressure relief valve 119, the pressure relief valve 119 opens to relieve pressure to the supply end during the oil inlet stage.

[0049] In some embodiments, the expansion valve 116 is also an electrically controlled valve structure with adjustable flow. By controlling the expansion valve 116 , the flow of cooling ammonia is adjusted and the temperature of the pump head 110 is controlled within a reasonable range.

[0050] In some embodiments, the ammonia gas at the outlet of the cooling passage 114 can be connected to the intake passage of an ammonia engine and mixed into the engine intake air to be used as fuel.

[0051] Furthermore, the inlet of the liquid inlet channel 112, the outlet of the liquid outlet channel 113 and the outlet of the cooling channel 114 of the embodiment of the utility model are all provided with a connector 120. The liquid inlet channel 112 is connected to the external liquid ammonia supply pipeline through the connector 120, the outlet of the liquid outlet channel 113 is connected to the ammonia rail in the ammonia engine through the connector 120, and the outlet of the cooling channel 114 is connected to the air intake channel of the ammonia engine through the connector 120.

[0052] The end of the plunger body 210 of this embodiment away from the pump pressure chamber 115 is connected to a coaxially arranged connecting rod 211, the connecting rod 211 is connected to the limiting block 212, and the connecting rod 211 is sleeved with a return spring 230. The two ends of the return spring 230 act on the pump head 110 and the limiting block 212 respectively, and the return spring 230 drives the plunger body 210 to reset downward. At this time, the driving assembly 220 only drives the plunger body 210 to move upward.

[0053] The driving assembly 220 includes a camshaft 221 and at least one cam body 222. At least one cam body 222 is fixedly connected to the camshaft 221. The outer periphery of the cam body 222 abuts against the limit block 212. The plunger body 210 is driven by the cam to perform periodic reciprocating motion. The camshaft 221 is connected to the engine transmission. The camshaft 221 is driven by the engine and maintains a specific speed ratio relationship with the engine.

[0054] In existing technologies, the fuel supply pressure is usually around 5 bar for gasoline engines and 7 bar for diesel engines, while the liquid ammonia engine may be at least 15 bar. The supply pressure is relatively high, and the pressure resistance of the liquid inlet channel 112 of the ammonia pump must be higher than that of traditional engines. In addition, ammonia has a pungent odor, which is harmful to the human body and pollutes the environment, so it must be sealed. Ammonia is severely corrosive to materials such as copper, zinc, titanium, fluororubber and natural rubber, so the material of the ammonia pump needs to be specially selected.

[0055] Ammonia has little effect on cast iron, stainless steel, carbon steel, aluminum, perfluororubber, and nitrile rubber. The pump head 110, plunger body 210, and spring are made of stainless steel, the camshaft 221 is made of cast iron, the pump body 100 is made of cast aluminum, the O-ring is made of nitrile rubber, and the coil of the solenoid valve is encapsulated in a stainless steel shell to ensure that it does not come into contact with ammonia.

[0056] The working principle of the high-pressure liquid ammonia pump in the embodiment of the utility model is:

[0057] When the plunger body 210 moves downward, the valve core in the liquid inlet control valve 117 is automatically opened by the action of hydraulic force, the liquid inlet channel 112 is unblocked, and the liquid ammonia flows into the pump pressure chamber 115 through the liquid inlet channel 112. Then the plunger body 210 moves upward, the volume of the pump pressure chamber 115 is reduced, and the liquid inlet control valve 117 is closed at an appropriate time to form high pressure, which squeezes the liquid ammonia. The high-pressure liquid ammonia flows to the liquid outlet channel 113. When the pressure is greater than the set pressure of the one-way valve 118, the one-way valve 118 opens and the high-pressure ammonia is pumped out.

[0058] To protect the nozzles and ammonia rail at the rear end, when the pressure at the high-pressure end exceeds the set pressure of the pressure relief valve 119, the pressure relief valve 119 opens to release pressure to the supply end during the oil inlet phase. The plunger body 210 is driven by a cam and reciprocates periodically. The camshaft 221 is driven by the engine and maintains a specific speed ratio relationship with the engine.

[0059] At the same time, part of the liquid ammonia in the liquid inlet channel 112 passes through the expansion valve 116. The expansion valve 116 allows the liquid ammonia to pass through its throttling and vaporize and absorb heat in the cooling channel 114 to absorb the heat of the pump head 110, thereby achieving a cooling effect and lowering the operating temperature of the pump head 110. The flow rate of cooling ammonia is adjusted by the expansion valve 116 to control the temperature of the pump head 110 within a reasonable range. The ammonia gas at the outlet of the cooling channel 114 is connected to the intake channel of the ammonia engine, mixed into the engine intake, and still used as fuel.

[0060] The utility model utilizes ammonia gasification to lower the temperature of the pump head 110, thereby avoiding high operating temperature of the pump head 110 and gas binding caused by flash boiling of liquid ammonia. The cooled and heat-absorbing gasified ammonia can still be used as fuel, and is well suited to engine scenarios, does not cause pollution and waste, optimizes the corrosion resistance and pressure resistance of the product, ensures the function and performance of the product, and improves the quality.

[0061] The above specifically describes the preferred embodiments of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of this application.

Claims

1. A high-pressure liquid ammonia pump, characterized in that: include: The pump body is provided with at least one pump head, the pump head is provided with a plunger cavity, a liquid inlet channel, a liquid outlet channel, and a cooling channel, and an expansion valve is provided between the cooling channel and the liquid inlet channel; The pressurizing mechanism includes at least one plunger body and a driving assembly. The plunger body is movably arranged in the plunger cavity to form a pumping chamber. The pumping chamber is connected to the liquid inlet channel and the liquid outlet channel respectively. The driving assembly is configured to drive the plunger body to move in the plunger cavity to change the volume of the pumping chamber.

2. The high-pressure liquid ammonia pump according to claim 1, characterized in that: A liquid inlet control valve is provided between the liquid inlet channel and the pump pressure chamber.

3. The high-pressure liquid ammonia pump according to claim 2, characterized in that: The expansion valve and the liquid inlet control valve are both electrically controlled valve structures.

4. The high-pressure liquid ammonia pump according to claim 2, characterized in that: The liquid outlet channel is provided with a one-way valve with a flow direction from the pump pressure chamber to the liquid outlet channel. The one-way valve is configured to open to connect the liquid outlet channel when the pressure on the inlet side of the one-way valve is greater than a first preset value.

5. The high-pressure liquid ammonia pump according to claim 4, characterized in that: The one-way valve is connected in parallel with a pressure relief valve, which is configured to connect the liquid outlet channel with the pump pressure chamber when the outlet side pressure of the one-way valve is greater than a second preset value, and then relieve pressure to the liquid inlet channel when the liquid inlet control valve is opened.

6. The high-pressure liquid ammonia pump according to claim 1, characterized in that: The cooling channel has a wall heat exchange relationship with the plunger cavity, the liquid inlet channel, and the liquid outlet channel respectively.

7. The high-pressure liquid ammonia pump according to claim 1, characterized in that: The cooling channel is arranged around the outer circumference of the plunger cavity.

8. The high-pressure liquid ammonia pump according to claim 1, characterized in that: The inlet of the liquid inlet channel, the outlet of the liquid outlet channel and the outlet of the cooling channel are all provided with connectors.

9. The high-pressure liquid ammonia pump according to claim 1, characterized in that: The end of the plunger body away from the pump pressure chamber is connected to a coaxially arranged connecting rod, the connecting rod is connected to a limit block, and the connecting rod sleeve is provided with a return spring, and the two ends of the return spring act on the pump head and the limit block respectively.

10. The high-pressure liquid ammonia pump according to claim 9, characterized in that: The driving assembly includes a camshaft and at least one cam body. The at least one cam body is fixedly connected to the camshaft, and the outer periphery of the cam body abuts against the limit block.

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