A vehicle-mounted ammonia-resistant pilot-operated dual-piston ring solenoid valve

Abstract

This utility model relates to the field of solenoid valve technology, specifically a vehicle-mounted ammonia-resistant pilot-operated double-piston ring solenoid valve, comprising a lower valve body, an upper valve cover, and a protective shell. The upper valve cover is located above the lower valve body and is fixedly connected, with a sealing ring between them. The protective shell is located above the upper valve cover, and its inner cavity contains a stationary iron core. The protective shell is fixedly connected to the upper valve cover, and a junction box is provided on one side of the protective shell for connecting to a power supply line. The lower valve body has a first sliding cavity and a second sliding cavity. The first sliding cavity is slidably connected to the valve core's intermediate shaft, and the second sliding cavity is slidably connected to the double-piston valve core. An electromagnetic coil is located on the outside of the stationary iron core. This utility model significantly improves the sealing performance, operational reliability, and installation adaptability of the solenoid valve in a vehicle-mounted liquid ammonia environment through triple protection of double-piston rings, HNBR sealing design, anti-deformation boss, optimized spring, and pre-filter, ensuring stable system operation.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, specifically a vehicle-mounted ammonia-resistant pilot-operated double piston ring electromagnetic valve. Background Technology

[0002] In vehicle-mounted fluid control systems, solenoid valves are critical control components. While existing low- and medium-pressure solenoid valves perform well in conventional fluid control scenarios, they exhibit significant shortcomings when dealing with liquid ammonia media: the single-piston-ring valve core seal is insufficient to withstand the strong permeability of liquid ammonia, resulting in poor sealing reliability; the PTFE gasket has poor creep resistance and is prone to deformation under high pressure, leading to potential leakage; the valve cover lacks a valve core protection design and is not adapted to vehicle vibration conditions, easily causing valve disc deformation, piston ring jamming, and insufficient operational stability; the lack of a dedicated vehicle-mounted bracket makes installation cumbersome and unstable, easily causing displacement and loosening due to vehicle bumps; and the absence of a pre-filtration mechanism allows impurities in liquid ammonia to easily corrode internal precision structures, accelerating component wear and overall reducing the system's operational continuity, reliability, and service life.

[0003] To address the aforementioned technical shortcomings, a solution is proposed. Utility Model Content

[0004] The purpose of this invention is to provide a vehicle-mounted ammonia-resistant pilot-operated double piston ring solenoid valve to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A vehicle-mounted ammonia-resistant pilot-operated dual-piston ring solenoid valve includes a lower valve body, an upper valve cover, and a protective housing; the upper valve cover is located above the lower valve body and is fixedly connected thereto, and a sealing ring is provided between the two.

[0007] The protective outer shell is located above the upper valve cover, and its inner cavity is equipped with a stationary iron core;

[0008] The protective housing is fixedly connected to the upper valve cover, and a junction box is provided on one side of the protective housing for connecting to the power supply line;

[0009] The lower valve body is provided with a first sliding chamber and a second sliding chamber. The first sliding chamber is slidably connected to the valve core intermediate shaft, and the second sliding chamber is slidably connected to the double piston valve core.

[0010] An electromagnetic coil is provided on the outside of the stationary iron core. The electromagnetic coil is used to generate electromagnetic force to drive the double piston valve core to move when energized. Two piston rings are embedded on the outside of the double piston valve core.

[0011] The bottom of the upper valve cover is provided with a boss coupled to the intermediate shaft of the valve core. The double piston valve core is slidably sleeved on the outside of the intermediate shaft of the valve core. The double piston valve core and the intermediate shaft of the valve core are fixed by sealing bolts, and a sealing gasket is provided between them.

[0012] Furthermore, the two piston rings are axially spaced along the dual piston valve core, and the outer circumferential surface of the piston rings is sealed and fitted with the inner wall of the second sliding cavity.

[0013] Furthermore, the inner hole of the boss is adapted to the outer peripheral surface of the valve core intermediate shaft.

[0014] Furthermore, a valve core return spring is provided between the dual-piston valve core and the upper valve cover. The two ends of the valve core return spring are fixed to the top of the dual-piston valve core and the bottom of the upper valve cover, respectively. The valve core return spring is used to drive the dual-piston valve core to quickly return to the closed position when the electromagnetic force disappears.

[0015] Furthermore, the lower valve body is provided with a solenoid valve inlet and a solenoid valve outlet on both sides respectively; the upper valve cover is fixedly connected to the lower valve body by multiple valve cover bolts; the protective shell is fixed to the top of the upper valve cover by a clamping nut and a stationary iron core, and the sealing gasket completely covers the contact surface between the sealing bolt and the double piston valve core;

[0016] A bracket is fixedly installed on the outer side of the lower valve body.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. This design, through a double piston ring structure and HNBR-specific sealing material, fundamentally solves the sealing problem caused by the strong permeability of liquid ammonia, achieving a significant improvement in sealing performance. The double piston rings are spaced apart along the axial direction of the double piston valve core, forming a double sealing barrier by tightly fitting against the inner wall of the second sliding chamber of the lower valve body. Compared to the traditional single piston ring structure, this not only expands the sealing contact area but also effectively blocks the permeation path of liquid ammonia through the complementary effect of the two seals, completely overcoming the pain points of easy leakage and high opening resistance in traditional structures. Simultaneously, key sealing parts of the solenoid valve (the contact surface between the upper valve cover and the lower valve body, the sealing bolt connection, etc.) all use HNBR (hydrogenated nitrile butadiene rubber) seals. Its unique chemical structure provides superior resistance to ammonia corrosion, significantly extending the service life of the seals compared to traditional PTFE gaskets, and preventing sealing failure due to corrosion and aging. The combination of a dual-sealing structure and ammonia-resistant material enables the solenoid valve to maintain excellent sealing performance under complex operating conditions such as vehicle vibration and temperature fluctuations, significantly reducing the risk of liquid ammonia leakage, ensuring the safety of medium storage and transmission in the vehicle-mounted liquid ammonia system, and providing core protection for the stable operation of the entire vehicle system.

[0019] 2. The boss added to the bottom of the upper valve cover is precisely coupled with the intermediate shaft of the valve core. During the valve core's start-stop and reciprocating motion, it provides stable guidance for the valve core and buffer support for the upper plate surface of the valve core. Finite element analysis and actual testing have verified that this reduces the risk of valve plate deformation, fundamentally avoiding problems such as piston ring jamming and abnormal sealing gaps caused by valve plate deformation. The valve core return spring adopts an optimized length design, which has excellent buffering and shock absorption performance without affecting the medium flow rate. This reduces the impact stress of the valve core, effectively reduces rigid collisions between the valve core and the internal structure of the valve body, and extends the service life of the valve core and related components. The inlet of the solenoid valve is equipped with a 200-mesh cup-shaped filter screen. The filtration precision is precisely designed for the characteristics of impurities in the liquid ammonia system. It can efficiently intercept particulate impurities, preventing impurities from entering the valve body and corroding the valve core, piston rings and other precision structures, reducing component wear and jamming failures, further extending the valve maintenance cycle and improving the valve's continuous and stable operation capability under long-term vehicle-mounted conditions. Attached Figure Description

[0020] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings;

[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0022] Figure 2 This is a schematic diagram of the inlet structure of the solenoid valve in this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the mounting bracket of this utility model;

[0024] Figure 4 This is a schematic diagram of the electromagnetic coil structure in this utility model;

[0025] Figure 5 This is a cross-sectional view of the overall structure of this utility model;

[0026] Figure 6 This is a front view of the cross-sectional structure of this utility model;

[0027] Figure 7 This is a schematic diagram of the sealing bolt structure in this utility model.

[0028] Reference numerals: 1. Compression nut; 2. Protective housing; 3. Valve cover bolt; 4. Upper valve cover; 5. Lower valve body; 6. Solenoid valve outlet; 7. Solenoid coil; 8. Static iron core; 9. Boss; 10. Valve core return spring; 11. Sealing bolt; 12. Double piston valve core; 13. Bracket; 14. Piston ring; 15. Valve core intermediate shaft; 16. Solenoid valve inlet. Detailed Implementation

[0029] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0030] Example: Figures 1-7 As shown, a vehicle-mounted ammonia-resistant pilot-operated double piston ring solenoid valve includes a lower valve body 5, an upper valve cover 4, and a protective housing 2; the upper valve cover 4 is located above the lower valve body 5 and is fixedly connected, and a sealing ring is provided between the two; the protective housing 2 is located above the upper valve cover 4, and its inner cavity is provided with a stationary iron core 8; the protective housing 2 is fixedly connected to the upper valve cover 4, and a junction box is provided on one side of the protective housing 2 for connecting to a power supply line;

[0031] The lower valve body 5 is provided with a first sliding cavity and a second sliding cavity. The first sliding cavity is slidably connected to the valve core intermediate shaft 15, and the second sliding cavity is slidably connected to the double piston valve core 12. An electromagnetic coil 7 is provided on the outside of the stationary iron core 8. The electromagnetic coil 7 is used to generate electromagnetic force to drive the double piston valve core 12 to move after being energized. Two piston rings 14 are embedded on the outside of the double piston valve core 12. Its outer circumferential surface is tightly fitted with the inner wall of the second sliding cavity of the lower valve body 5 to form a double sealing barrier, which completely solves the sealing problem caused by the strong permeability of liquid ammonia.

[0032] The bottom of the upper valve cover 4 is provided with a boss 9 coupled to the valve core intermediate shaft 15. The double piston valve core 12 is slidably sleeved on the outside of the valve core intermediate shaft 15. The double piston valve core 12 and the valve core intermediate shaft 15 are fixed by sealing bolts 11, and a sealing gasket is provided between them. The HNBR sealing gasket between the sealing bolts 11 and the double piston valve core 12 completely covers the contact surface, further eliminating the risk of local leakage.

[0033] Two piston rings 14 are axially spaced along the double piston valve core 12, and the outer circumferential surface of the piston rings 14 is sealed and fitted with the inner wall of the second sliding cavity.

[0034] The inner hole of the boss 9 is adapted to the outer circumferential surface of the valve core intermediate shaft 15.

[0035] A valve core return spring 10 is provided between the dual piston valve core 12 and the upper valve cover 4. The two ends of the valve core return spring 10 are fixed to the top of the dual piston valve core 12 and the bottom of the upper valve cover 4, respectively. The valve core return spring 10 is used to drive the dual piston valve core 12 to quickly return to the closed position when the electromagnetic force disappears.

[0036] The lower valve body 5 is provided with a solenoid valve inlet 16 and a solenoid valve outlet 6 on both sides respectively; the lower valve body 5 and the upper valve cover 4 are fastened together by multiple valve cover bolts 3. The sealing ring and sealing gasket assembled between the two are made of HNBR (hydrogenated nitrile rubber), which utilizes its strong ammonia corrosion resistance to avoid the risk of seal corrosion failure from the source compared with traditional PTFE gasket material.

[0037] The protective housing 2 is fixed to the top of the upper valve cover 4 by the cooperation of the clamping nut 1 and the stationary iron core 8, and the sealing gasket completely covers the contact surface of the sealing bolt 11 and the double piston valve core 12;

[0038] A bracket 13 is fixedly installed on the outside of the lower valve body 5.

[0039] In conjunction with the embodiments, this utility model specifically addresses the pain points of traditional solenoid valves in vehicle-mounted liquid ammonia environments, such as sealing leakage, corrosion failure, unstable operation, and poor installation compatibility. The specific principle is as follows:

[0040] The customized bracket 13 is welded and fixed in the center of the lower valve body 5. The bracket 13 adopts a quick installation interface design, which can shorten the installation time by more than 50% and can be flexibly adjusted according to the vehicle layout space to ensure stable installation under various vehicle working conditions and without interfering with the operation of other vehicle components.

[0041] The boss 9 at the bottom of the upper valve cover 4 is precisely coupled to the valve core intermediate shaft 15, providing initial guidance for the movement of the double piston valve core 12. At the same time, it provides buffer support for the upper plate of the double piston valve core 12 during the start-up and stop process. According to finite element analysis and actual testing, this structure can reduce the risk of valve plate deformation by more than 99% and effectively avoid the problem of piston ring 14 jamming. The valve core return spring 10 is in a pre-compressed state, with its two ends fixed to the top of the double piston valve core 12 and the bottom of the upper valve cover 4, respectively. Its length has been optimized to have excellent buffer performance without affecting the medium flow rate, which can reduce the impact stress of the double piston valve core 12 by more than 30%.

[0042] Impurity interception and protection: The 200-mesh cup-shaped filter screen installed at the front end of the solenoid valve inlet 16 is precisely designed with filtration precision according to the characteristics of impurities in the liquid ammonia system. It can efficiently intercept more than 80% of particulate impurities, preventing impurities from corroding the valve core, piston ring 14 and other internal precision structures, and extending the valve maintenance cycle and service life.

[0043] The protective housing 2 is fixed to the top of the upper valve cover 4 by the clamping nut 1 and the stationary iron core 8. The electromagnetic coil 7 is wound around the outside of the stationary iron core 8 in its inner cavity. The junction box is connected to the vehicle power supply line. In the power-off state, the electromagnetic coil 7 does not generate electromagnetic force, and the stationary iron core 8 remains static and does not interfere with the closed state of the double piston valve core 12.

[0044] When the vehicle-mounted liquid ammonia system requires medium flow, the power supply line energizes the electromagnetic coil 7 through the junction box, triggering the opening action of the double piston valve core 12, achieving efficient and stable on / off control throughout the process. After the electromagnetic coil 7 is energized, it generates a strong electromagnetic force, attracting the stationary iron core 8 and forming a downward driving force. This driving force overcomes the pre-compression force of the valve core return spring 10, pushing the valve core intermediate shaft 15 to slide downward along the first sliding cavity of the lower valve body 5. Since the double piston valve core 12 is fixedly sleeved on the outside of the valve core intermediate shaft 15 by the sealing bolt 11, the two move downward along the second sliding cavity axially in sync, realizing the valve opening action.

[0045] During the movement, the precise coupling between the boss 9 and the valve core intermediate shaft 15 continuously provides guidance, avoiding sealing failure or jamming caused by the offset of the double piston valve core 12; the valve core return spring 10 with optimized length is slowly stretched, which fully buffers the impact force of the double piston valve core 12 moving downward, reduces the rigid collision between the double piston valve core 12 and the internal structure of the lower valve body 5, and further extends the service life of the double piston valve core 12 and the valve as a whole.

[0046] As the dual-piston valve core 12 moves downward, the flow channel between the solenoid valve inlet 16 and the solenoid valve outlet 6 is opened. The liquid ammonia medium is first filtered by the 200-mesh cup-shaped filter screen at the front end of the inlet, intercepting particulate impurities before entering the lower valve body 5. When it flows through the channel between the dual-piston valve core 12 and the sliding chamber, the two piston rings 14 are always sealed and fitted with the inner wall of the second sliding chamber, forming a double sealing barrier. This ensures smooth medium flow and completely solves the opening problem and leakage risk of the traditional single piston ring 14, achieving stable flow in the liquid ammonia environment.

[0047] Power-off reset and closing process: When the vehicle-mounted liquid ammonia system does not require medium flow, the power supply line is disconnected, the electromagnetic coil 7 is de-energized, the electromagnetic force disappears, and the valve is automatically reset and closed through the mechanical structure: the pre-compression force of the valve core reset spring 10 is released, generating an upward reset driving force, which pushes the double piston valve core 12 and the valve core intermediate shaft 15 to move upward synchronously. Its optimized length design ensures that the reset action is fast and stable, avoiding medium residue leakage caused by reset lag;

[0048] Sealing structure reconstruction: As the dual piston valve core 12 returns to its initial closed position, the two piston rings 14 once again fit tightly against the inner wall of the second sliding chamber, rebuilding the double seal; the HNBR material sealing rings and gaskets continue to perform their ammonia corrosion resistance, ensuring that the sealing performance does not degrade during long-term use, and the coupling relationship between the boss 9 and the valve core intermediate shaft 15 is restored to its initial position, preparing for the next opening and closing action.

[0049] After the valve is fully closed, the valve core return spring 10 is back to the pre-compression state, the electromagnetic coil 7 waits for the next power supply command through the junction box, the pre-filter continuously intercepts impurities on the side of the electromagnetic valve inlet 16, the bracket 13 keeps the valve firmly installed, and the whole system returns to the static standby state, ready to respond to the on / off needs of the vehicle liquid ammonia system at any time.

[0050] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to any specific implementation. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A vehicle-mounted ammonia-resistant pilot-operated double-piston ring solenoid valve, characterized in that, It includes a lower valve body (5), an upper valve cover (4), and a protective shell (2); the upper valve cover (4) is located above the lower valve body (5) and is fixedly connected, and a sealing ring is provided between the two; The protective outer shell (2) is located above the upper valve cover (4), and its inner cavity is provided with a stationary iron core (8). The protective housing (2) is fixedly connected to the upper valve cover (4), and a junction box is provided on one side of the protective housing (2) for connecting to the power supply line; The lower valve body (5) is provided with a first sliding cavity and a second sliding cavity. The first sliding cavity is slidably connected to the valve core intermediate shaft (15), and the second sliding cavity is slidably connected to the double piston valve core (12). An electromagnetic coil (7) is provided on the outside of the stationary iron core (8). The electromagnetic coil (7) is used to generate electromagnetic force to drive the double piston valve core (12) to move after being energized. Two piston rings (14) are embedded on the outside of the double piston valve core (12). The bottom of the upper valve cover (4) is provided with a boss (9) coupled to the valve core intermediate shaft (15). The double piston valve core (12) is slidably sleeved on the outside of the valve core intermediate shaft (15). The double piston valve core (12) and the valve core intermediate shaft (15) are fixed by sealing bolts (11), and a sealing gasket is provided between them.

2. The vehicle-mounted ammonia-resistant pilot-operated double piston ring solenoid valve according to claim 1, characterized in that, The two piston rings (14) are axially spaced along the double piston valve core (12), and the outer circumferential surface of the piston rings (14) is sealed and fitted with the inner wall of the second sliding cavity.

3. The vehicle-mounted ammonia-resistant pilot-operated double-piston ring solenoid valve according to claim 2, characterized in that, The inner hole of the boss (9) is adapted to the outer circumferential surface of the valve core intermediate shaft (15).

4. The vehicle-mounted ammonia-resistant pilot-operated double piston ring solenoid valve according to claim 3, characterized in that, A valve core reset spring (10) is provided between the double piston valve core (12) and the upper valve cover (4). The two ends of the valve core reset spring (10) are fixed to the top of the double piston valve core (12) and the bottom of the upper valve cover (4), respectively. The valve core reset spring (10) is used to drive the double piston valve core (12) to quickly reset to the closed position when the electromagnetic force disappears.

5. A vehicle-mounted ammonia-resistant pilot-operated double-piston ring solenoid valve according to claim 4, characterized in that, The lower valve body (5) is provided with a solenoid valve inlet (16) and a solenoid valve outlet (6) on both sides respectively; the upper valve cover (4) is fixedly connected to the lower valve body (5) by multiple valve cover bolts (3); the protective shell (2) is fixed to the top of the upper valve cover (4) by a clamping nut (1) and a stationary iron core (8), and the sealing gasket completely covers the contact surface of the sealing bolt (11) and the double piston valve core (12); A bracket (13) is fixedly installed on the outside of the lower valve body (5).

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