Leakage-proof backflow device of liquid ammonia pump

Abstract

The invention discloses an anti-leakage backflow device of a liquid ammonia pump, which comprises a plurality of sets of plunger valves, a sealing seat and a valve body, the plurality of sets of plunger valves are arranged in the valve body through the sealing seat, each set of plunger valve comprises a plunger and a plunger sleeve, a first O-shaped sealing ring is arranged between the plunger sleeve and the sealing seat, a second O-shaped sealing ring is arranged between the sealing seat and the valve body, and the first O-shaped sealing ring and the second O-shaped sealing ring are arranged in the valve body. An inclined hole is formed in the plunger sleeve; a cavity is formed among the plunger sleeve, the sealing seat, the first O-shaped sealing ring and the second O-shaped sealing ring; the inlet end of the pressure stabilizing valve component is connected with the cavity, and the outlet end of the pressure stabilizing valve component is connected with a liquid ammonia recovery device; according to the liquid ammonia recovery device, liquid ammonia flowing through the plunger in the liquid ammonia pump can flow into the cavity through the inclined hole in the plunger sleeve, when the pressure reaches the opening pressure of the pressure stabilizing valve component, the liquid ammonia flows into the liquid ammonia recovery device through the pressure stabilizing valve component, and the liquid ammonia recovery treatment process is completed.

Description

Technical Field

[0001] This invention relates to the field of new energy fuel system technology for automobile engines, and in particular to a leak-proof backflow prevention device for a liquid ammonia pump. Background Technology

[0002] With increasing global focus on sustainable development, ammonia is gradually gaining popularity as a novel fuel, and its zero-carbon emission characteristics make it an important tool for addressing climate change. However, because ammonia fuel is gaseous at low pressures, gaseous ammonia suffers from drawbacks such as large volume, storage difficulties, low energy density, and poor practicality. Therefore, to convert ammonia fuel from a gaseous state to a liquid state for use, liquid ammonia pumps currently on the market generally operate at very high pressures. This leads to ammonia leakage problems under high operating pressures, polluting the environment and harming human health.

[0003] Traditional liquid ammonia pumps are equipped with a skeleton oil seal at the lower end of the plunger. The skeleton oil seal increases the friction force and enhances the sealing performance by compressing the plunger and plunger sleeve, thereby reducing the amount of liquid ammonia leaking along the tiny gap between the plunger and plunger sleeve. However, in actual use, the sealing effect of the skeleton oil seal is not very good, and a large amount of liquid ammonia still flows into the oil chamber, affecting the oil supply efficiency of the ammonia pump and even damaging the ammonia pump. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a leakage prevention and backflow device for liquid ammonia pumps to address the problem of ammonia leakage under high operating pressure, thereby reducing liquid ammonia leakage and completing liquid ammonia recovery.

[0005] The technical problem to be solved by this invention can be achieved through the following technical solution:

[0006] A leak-proof backflow prevention device for a liquid ammonia pump includes several sets of plunger valves, sealing seats, and valve bodies. The plunger valves are installed in the valve bodies via the sealing seats. Each plunger valve includes a plunger and a plunger sleeve. A first O-ring seal is provided between the plunger sleeve and the sealing seat, and a second O-ring seal is provided between the sealing seat and the valve body. The device is characterized by: an oblique hole on the plunger sleeve; and at least one cavity between the plunger sleeve, the sealing seat, the first O-ring seal, and the second O-ring seal. It also includes a pressure-stabilizing valve component. The inlet end of the pressure-stabilizing valve component is connected to the cavity, and the outlet end of the pressure-stabilizing valve component is connected to a liquid ammonia recovery device. Liquid ammonia flowing through the plunger in the liquid ammonia pump flows into the cavity between the plunger sleeve, the sealing seat, the first O-ring seal, and the second O-ring seal through the oblique hole on the plunger sleeve. When the pressure reaches the opening pressure of the pressure-stabilizing valve component, the liquid ammonia flows through the pressure-stabilizing valve component into the liquid ammonia recovery device, completing the liquid ammonia recovery process.

[0007] In a preferred embodiment of the present invention, two cavities are provided between each plunger sleeve and each sealing seat, each first O-ring, and each second O-ring. The two cavities are arranged on the left and right sides, and the left and right cavities are connected to each other through the transverse hole between them, allowing liquid ammonia to flow between them.

[0008] In a preferred embodiment of the present invention, the first O-ring and the second O-ring are made of hydrogenated nitrile butadiene with good resistance to ammonia corrosion.

[0009] In a preferred embodiment of the present invention, the pressure regulating valve component is designed to open at a pressure of 0.16 MPa-0.25 MPa.

[0010] In a preferred embodiment of the present invention, the pressure regulating valve component is connected to a connector sleeve via a combination sealing gasket and a hinged pipe fitting, the connector sleeve being mounted on the valve body.

[0011] By adopting the above technical solution, the anti-leakage backflow device for a liquid ammonia pump of the present invention greatly reduces the amount of liquid ammonia leaking into the oil chamber. The principle is that the liquid ammonia that would normally leak downward into the oil chamber where the camshaft is located through the tiny gap between the plunger and the plunger sleeve will enter the cavity formed by the sealing seat, the first O-ring seal, and the second O-ring seal 7 along the inclined hole of the plunger sleeve. The sealing seat will also prevent the liquid ammonia from flowing downward into the oil chamber, ensuring that most of the liquid ammonia enters the pressure regulating valve component 1 to reach the opening pressure of the pressure regulating valve component, and then enters the liquid ammonia recovery device through the hinged pipe joint, thereby reducing liquid ammonia leakage and completing the liquid ammonia recovery treatment.

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] Compared to traditional skeleton oil seal methods, this invention significantly reduces the amount of liquid ammonia leaking into the oil chamber through the tiny gaps between the plunger and plunger sleeve, improving the ammonia pump's oil supply efficiency, durability, and protection. Furthermore, in this invention, leaked liquid ammonia flows out through a pressure regulating valve and a hinged pipe joint. Depending on the specific requirements, the hinged pipe joint can even be connected to a liquid ammonia recovery tank to recover leaked liquid ammonia, thus improving the utilization rate of liquid ammonia. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the anti-leakage backflow device for the liquid ammonia pump of the present invention. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0016] See Figure 1The figure shows a leakage prevention and backflow prevention device for a liquid ammonia pump, which includes several sets of plunger valves, a sealing seat 6, and a valve body 10. The several sets of plunger valves are installed in the valve body 10 through the sealing seat 6. Each set of plunger valves includes a plunger 8 and a plunger sleeve 9. A first O-ring 5 is provided between the plunger sleeve 9 and the sealing seat 6, and a second O-ring 7 is provided between the sealing seat 6 and the valve body 11.

[0017] An oblique hole 11 is provided on the plunger sleeve 9. Two cavities 12a and 12b are provided between each plunger sleeve 9 and each sealing seat 6, each first O-ring 5, and each second O-ring 7. The two cavities 12a and 12b are arranged on the left and right sides, and are connected to each other through a transverse hole 13, allowing liquid ammonia to flow between them. The first O-ring 5 and the second O-ring 7 are made of hydrogenated nitrile butadiene, which has good resistance to ammonia corrosion.

[0018] It also includes a pressure regulating valve component 1, the inlet end of which is connected to cavities 12a and 12b, and the outlet end of which is connected to a liquid ammonia recovery device (not shown in the figure). The liquid ammonia flowing through the plunger 8 in the liquid ammonia pump will flow into the cavities 13a and 13b between the plunger sleeve 9 and the sealing seat 6, the first O-ring 6, and the second O-ring 7 through the oblique hole 12 on the plunger sleeve 9. When the pressure reaches the opening pressure of the pressure regulating valve component 1, the liquid ammonia flows into the liquid ammonia recovery device through the pressure regulating valve component 1, completing the liquid ammonia recovery process.

[0019] The pressure regulating valve component 1 is designed to open at a pressure of 0.16MPa-0.25MPa. The pressure regulating valve component 1 is connected to a connector sleeve 4 via a combined sealing gasket 2 and a hinged pipe fitting 3. The connector sleeve 4 is mounted on the valve body 11.

Claims

1. A leakage-proof backflow device of a liquid ammonia pump, comprising a plurality of sets of plunger valves, a sealing seat and a valve body, the plurality of sets of plunger valves being installed in the valve body through the sealing seat, each set of plunger valves comprising a plunger and a plunger sleeve, a first O-shaped sealing ring being arranged between the plunger sleeve and the sealing seat, and a second O-shaped sealing ring being arranged between the sealing seat and the valve body, characterized in that: The plunger sleeve is provided with an inclined hole, and the plunger sleeve has at least one cavity between the sealing seat, the first O-shaped sealing ring and the second O-shaped sealing ring; the pressure stabilizing valve component is connected with the cavity at the inlet end, and the outlet end of the pressure stabilizing valve component is connected with a liquid ammonia recovery device; the liquid ammonia flowing through the plunger in the liquid ammonia pump flows into the cavity between the plunger sleeve, the sealing seat, the first O-shaped sealing ring and the second O-shaped sealing ring through the inclined hole on the plunger sleeve, and when the pressure reaches the opening pressure of the pressure stabilizing valve component, the liquid ammonia flows into the liquid ammonia recovery device through the pressure stabilizing valve component, thereby completing the recovery process of the liquid ammonia.

2. The backflow prevention device for a liquid ammonia pump according to claim 1, wherein Two cavities are arranged between each plunger sleeve and each sealing seat, each first O-shaped sealing ring and each second O-shaped sealing ring, and the two cavities are arranged on the left and right sides and are connected with each other through a horizontal hole.

3. A backflow prevention device for a liquid ammonia pump according to claim 1 or 2, characterized in that The first O-shaped sealing ring and the second O-shaped sealing ring are made of hydrogenated butyronitrile which has good ammonia corrosion resistance.

4. The backflow prevention device of claim 1, wherein the backflow prevention device is a backflow prevention device for a liquid ammonia pump. The design opening pressure of the pressure stabilizing valve component is 0.16-0.25 MPa.

5. The leakage-proof backflow device of a liquid ammonia pump according to claim 1 or 4, characterized in that, The pressure stabilizing valve component is connected with a joint screw sleeve through a combined sealing gasket and a hinged pipe joint, and the joint screw sleeve is installed on the valve body.

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