Electromagnetic pneumatic valve for water cooling brake drum of motor vehicle

Abstract

The utility model relates to an electromagnetic pneumatic valve for a water cooling brake drum of a motor vehicle. The electromagnetic pneumatic valve is applied to guiding water in a water tank to the brake drum through pipeline control in truck braking. The technical problem that a sealing cover of a valve port is opened without depending on the pressure of flowing water flowing out of the bottom of a water tank is solved, and the electromagnetic valve is provided with an electromagnetic valve and is characterized by being provided with a cylinder barrel which is fixedly connected with a valve body partition plate; the piston rod penetrates through the valve body partition plate mounting hole and is movably connected with the valve body partition plate mounting hole in a sealing manner; two ends of the piston rod are fixedly connected with the piston in the cylinder barrel and the valve port sealing cover respectively; and the lower end of the piston rod through hole is communicated with the water outlet valve opening and the waterway outlet through a small hole formed in the valve opening sealing cover. The device has the advantages that damage caused by the fact that the piston rod pushes the valve opening sealing cover too fast is effectively prevented, damage to the valve opening sealing cover caused by water spraying brake under the freezing weather condition is effectively prevented, and all water branches are isolated from one another and can work independently.

Description

Technical Field

[0001] The utility model relates to an electromagnetic pneumatic valve for a water-cooled brake drum of a motor vehicle. The valve is applied to the braking of a truck to guide water in a water tank to the brake drum through a pipeline control, so that the sprayed water is sprinkled on the brake drum to prevent the brake drum from heating up, thereby maintaining the necessary braking force when the driver steps on the brake. Background Art

[0002] To increase water flow, the waterway solenoid valve industry generally employs a valve structure in which a movable core pilot-operated to open the valve port seal cap, which acts as a connecting cover on both the upper and lower surfaces. The valve port includes an inlet and an outlet, and the valve port seal cap covers both. A small hole is provided in the valve port seal cap, connecting the inlet to the water port. Valves on the upper and lower surfaces of the connecting cover are connected to the outlet port. When the pilot is activated, the movable core removes the seal from the valves on the upper and lower surfaces of the connecting cover, allowing water from the tank bottom to flow through the inlet, the small hole, and the opened valves on the upper and lower surfaces of the connecting cover to the outlet. After a small amount of water flows through the upper surface of the valve port seal cap to the outlet, the water pressure on the upper and lower surfaces of the valve port seal cap equalizes. Water from the tank bottom flows directly from the inlet to the outlet via the lower surface of the valve port seal cap. The flowing water pressure then easily lifts the valve port seal cap upward, enabling a large flow of water. In practice, water-circuit solenoid valves cannot avoid seizures caused by solid particles drawn from the natural environment after the vehicle's radiator is filled with liquid water. Water-circuit solenoid valves are also adversely affected by fluctuations in ambient temperature and humidity. The pilot-operated opening mechanism is complex, and valves that rely on flowing water pressure to open are prone to frequent operational failures.

[0003] In view of the drawbacks of the above-mentioned water circuit solenoid valves, the second generation of motor vehicle brake drum water spray cooling technology has emerged. Chinese utility model patent ZL201720366884.1 announced an invention entitled "A water supply regulating valve and a cooling system using the water supply regulating valve" (Announcement No. CN 206669085 U). The system includes a high-pressure gas source, a pressure reducing and limiting valve, a water tank, and an electromagnetic pneumatic valve. The pressure reducing and limiting valve is installed in the gas circuit, and the electromagnetic pneumatic valve is installed in the water circuit. After pressure reduction and pressure limiting in the gas circuit, the airflow of the high-pressure gas source is divided into two paths: one path goes to the water surface inside the water tank. The other path goes to the electromagnetic pneumatic valve.

[0004] The electromagnetic pneumatic valve, installed in the waterway, includes a solenoid valve. The solenoid valve has an exhaust port for discharging air from the valve's internal gas working chamber to the outside; an air inlet and a working air outlet leading to the gas working chamber for introducing reduced and limited pressure air into the valve's internal gas working chamber. The solenoid valve is a two-position, three-way reversing valve. When the valve core is in the first position, the air inlet connects to the working air outlet, and the exhaust port is closed. When in the second position, the working air outlet is closed, and the exhaust port is open and connected to the gas working chamber. The solenoid pneumatic valve also has a waterway inlet for connecting to the water outlet from the bottom of the water tank; and a waterway inlet for connecting to the water pipe that directs water to the brake drum. The solenoid pneumatic valve has a valve port internally connected to the waterway inlet. A valve port sealing cover covers the valve port, with its edges compressed by the valve body hardware and its upper portion applied by one end of a compression spring, the other end of which abuts the valve body hardware. The valve port sealing cover is made of a material with a certain degree of elastic deformation properties. The spring forces the valve port sealing cap inside the solenoid pneumatic valve to block the valve port, overcoming the pressure generated by the water depth in the water tank. During this time, the water supply terminal stops dispensing cooling water to the brake drum. When water spray is required, the solenoid valve's air inlet closes and its outlet opens. Water flowing from the water tank flows through the water supply, where it overcomes the spring force, lifting the valve port sealing cap. This allows the water to flow to the water supply terminal, where it sprays cooling water onto the brake drum. To stop spraying, the solenoid valve's air inlet opens, allowing reduced and limited pressure to flow through the solenoid valve's air inlet, through the working air outlet, and into the valve's gas working chamber. The solenoid pneumatic valve's outlet closes simultaneously. The upper portion of the valve port sealing cap is now connected to the upper portion of the water tank. Pressure from both the air pressure and the spring forces the valve port sealing cap to block the valve port, halting the water supply terminal from dispensing cooling water to the brake drum. The system insists on using the pressure of flowing water to open the valve opening sealing cover. However, during use, the water tank is occasionally filled, and the air path connecting the water tank and the electromagnetic pneumatic valve is also filled with water. The solenoid valve components are easily damaged during use, and the electromagnetic pneumatic valve inevitably fails to work. Summary of the Invention

[0005] The purpose of the utility model is to overcome the above-mentioned shortcomings of the prior art and to provide an electromagnetic pneumatic valve for a water-cooled brake drum of a motor vehicle which does not rely on the water pressure of the flowing water flowing out of the bottom of the water tank to open the valve port sealing cover.

[0006] The utility model (a) is an electromagnetic pneumatic valve for a water-cooled brake drum of a motor vehicle, with a water channel inlet and a water channel outlet and a solenoid valve, a valve port sealing cover covering the water inlet valve port and the water outlet valve port, the edges of which are sealed and fastened to the valve body, the upper surface is exerted with a force by one end of a compression spring, and the other end of the compression spring rests on the valve body partition; the solenoid valve has an exhaust port, an air inlet, and a first working air outlet; it is characterized in that it has a cylinder, which is fastened to the valve body partition; the piston rod passes through the valve body partition mounting hole and is sealed and movably connected to the valve body partition mounting hole, and the two ends are fastened to the piston in the cylinder and the valve port sealing cover respectively; the piston rod has a piston rod through hole along the axial and radial directions, the lower end of the piston rod through hole is connected to the water outlet valve port and the water channel inlet through a small hole opened on the valve port sealing cover; the upper end of the piston rod through hole is connected to the upper cavity of the cylinder, and the lower cavity of the cylinder is connected to the first working air outlet.

[0007] (b) The electromagnetic pneumatic valve for a water-cooled brake drum of a motor vehicle as described in a is characterized by having a second working air outlet; the electromagnetic valve is provided with a check valve, and the check valve outlet is the second working air outlet.

[0008] (c) The electromagnetic pneumatic valve for a water-cooled brake drum of a motor vehicle as described in a or b is characterized in that the air flow of the high-pressure air source flows to the check valve after being controlled by the switch of the electromagnetic valve; when the valve core of the electromagnetic valve is in the first position, the air inlet, the second working air outlet and the first working air outlet are connected, and the exhaust port is closed; when the valve core is in the second position, the second working air outlet is closed, the air inlet is closed, the exhaust port is opened and connected to the first working air outlet.

[0009] The utility model has the following advantages:

[0010] 1. When the piston moves upward, the water or gas in the upper chamber of the cylinder is discharged to the water outlet through the piston rod through-hole and the small hole in the valve port sealing cover at a certain flow rate and flow rate. The size of the piston rod through-hole controls the water or gas in the upper chamber of the cylinder to hinder the upward speed of the piston in the cylinder, effectively preventing the valve port sealing cover from being damaged by the piston rod from opening too quickly. When the piston moves downward, due to negative pressure in the upper chamber of the cylinder, the water or air in the water outlet is sucked into the piston rod through-hole through the small hole in the valve port sealing cover and into the interior of the upper chamber of the cylinder, consuming the kinetic energy of the valve port sealing cover in the process of closing the water inlet valve port, effectively preventing the piston rod from pushing the valve port sealing cover too quickly to close the valve port and causing damage to the valve port sealing cover.

[0011] 2. The water inlet and outlet valves are opened and closed slowly enough. The small holes on the valve sealing cover connect the gas or liquid on the upper and lower surfaces of the cover, which makes the fluid pressure on the upper and lower surfaces almost equal at all times, thus preventing the damage of the valve sealing cover caused by uneven pressure.

[0012] 3. Long-distance motor vehicle transport is subject to large temperature fluctuations in the natural environment. Liquid water is drawn into the upper portion of the valve port sealing cover. When ice forms, water freezes on both the upper and lower surfaces of the cover. This prevents the valve port sealing cover from arching and cracking due to the expansion of the frozen surface when there is only liquid water on the lower portion. When liquid water is drawn into the upper chamber of the cylinder and freezes, it effectively prevents the piston rod from forcibly pulling on the frozen valve port sealing cover during upward movement, effectively protecting the valve port sealing cover from damage caused by the driver's water spray brake in icy weather.

[0013] 4. A check valve is used, so that the air flow from the high-pressure air source can flow into the pressure reducing and limiting valve after passing through the check valve. The air flow after pressure reduction and pressure limiting then enters the upper part of the water tank, replenishing the space formed by the drop in water level during spraying to the upper part of the water tank with constant pressure and flow, so that the water pressure flowing out of the bottom of the water tank becomes controllable, creating conditions for determining the design parameters of the electromagnetic pneumatic valve; at the same time, even if the water tank is occasionally filled with water, the water flow will not cross the check valve and fill the entire air path and the components in the air path with water, which avoids the malfunction caused by filling with water in the existing technology.

[0014] 5. When implementing multiple water channels to spray water for cooling the brake drum, the water branches formed by the electromagnetic pneumatic valve and the water pipes leading to the brake drum are connected in series in parallel. Each parallel water branch has a check valve, which not only isolates the gas and liquid flowing into the upper part of the water tank on the air path, but also ensures that each water branch is isolated from each other and can work independently.

[0015] 6. The gas in the high-pressure gas source flows to the upper part of the water tank, and its opening or closing is controlled by the solenoid valve in the electromagnetic pneumatic valve, which avoids the gas in the high-pressure gas source from directly flowing to the upper part of the water tank when there is no water spray brake, prevents the leakage of the high-pressure gas source and light leakage when the water spray brake is not in use, and eliminates the safety hazards that may occur when there is no gas source available during the operation of the motor vehicle.

[0016] 7. The small hole on the valve port sealing cover is connected to the water outlet valve port, but not to the water inlet valve port, which eliminates the function of using flowing water to pilot open the valve port sealing cover in the existing technology. The small solid particles inside the valve body can be flushed out of the small hole by gas or liquid water, maintaining the normal working state of the internal components of the electromagnetic pneumatic valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the gas and water circuit structure of the utility model installed on a motor vehicle.

[0018] In the figure, 1 is the high-pressure gas source, 3 is the pressure reducing and limiting valve, 5 is the water tank, and 7 is the electromagnetic pneumatic valve.

[0019] Figure 2This is a schematic diagram of the air and water circuit structure of the utility model installed on a motor vehicle with dual water spraying

[0020] In the figure, 1 is the high pressure gas source, 3 is the pressure reducing and limiting valve, 5 is the water tank, 7 is the electromagnetic pneumatic valve, and 9 is the second electromagnetic pneumatic valve.

[0021] Figure 3 This is a schematic diagram of the structure of the electromagnetic pneumatic valve of the utility model

[0022] In the figure, 11 is the second working air outlet, 12 is the check valve, 13 is the air inlet, 15 is the first working air outlet, 17 is the first working gas channel, 19 is the cylinder, 21 is the piston, 23 is the piston rod, 25 is the piston rod through hole, 27 is the valve body partition, 29 is the compression spring, 31 is the valve port sealing cover, 33 is the small hole, 35 is the water channel access port, 37 is the water channel access port, 38 is the water inlet valve port, 39 is the piston lower chamber, 41 is the piston upper chamber, and 43 is the exhaust port

[0023] Figure 4 yes Figure 5 Right side view

[0024] 33 in the figure is a small hole

[0025] Figure 5 This is a cross-sectional view of the valve port sealing cover

[0026] 33 in the figure is a small hole

[0027] Figure 6 yes Figure 5 Left view

[0028] 33 in the figure is a small hole

[0029] Figure 7 This is a schematic diagram of the high-pressure gas flow route of the electromagnetic pneumatic valve when the solenoid valve is open.

[0030] Figure 8 This is a schematic diagram of the high-pressure gas flow route of the electromagnetic pneumatic valve in the closed state of the solenoid valve. DETAILED DESCRIPTION

[0031] The electromagnetic pneumatic valve is provided with a waterway inlet (37) and a waterway outlet (35); a valve port sealing cover (31) covers the water inlet valve port (38) and the water outlet valve port, and is sealed and fastened to the valve body around the edges; a force is applied to the upper surface by one end of a compression spring (29), and the other end of the compression spring abuts against the valve body partition (27); the electromagnetic pneumatic valve is provided with a solenoid valve, and the solenoid valve is provided with an exhaust port (43), an air inlet (13), and a first working air outlet (15); and the opening and closing of the solenoid valve is controlled by a circuit switch. The improvements of the utility model are as follows: the cylinder (19) is provided, and the cylinder is tightly connected to the valve body partition (27); the piston rod (23) passes through the valve body partition mounting hole and is sealed and movably connected to the valve body partition mounting hole, and the two ends are tightly connected to the piston (21) in the cylinder and the valve port sealing cover (31) respectively; the piston rod has a piston rod through hole (25) along the axial and radial directions, and the lower end of the piston rod through hole is connected to the water outlet valve port and the water channel connection port (35) through a small hole (33) opened on the valve port sealing cover; the upper end of the piston rod through hole is connected to the cylinder upper chamber (41), and the cylinder lower chamber (39) is connected to the first working air outlet (15). Because the perimeter of the valve port sealing cover is tightly sealed to the valve body, the piston rod pulls on the center of the valve port sealing cover as the piston moves upward or downward within the cylinder, causing it to deform slightly. This deformation can result in either an upward arch, revealing the inlet and outlet valves, or a flattening of the upper and lower surfaces, allowing the valve port sealing cover to securely cover the inlet and outlet valves. The piston rod through-hole, small hole, outlet valve, and waterway connection port serve as channels for the discharge of gas or liquid water from the piston's upper chamber, as well as solid particles generated along the passageway. They also allow the upper chamber to draw in gas or liquid water through the waterway connection port as the piston moves downward. The diameter of the piston rod through-hole also plays a crucial role in the speed of air intake and exhaust, damping the piston rod's pull on the valve port sealing cover and preventing mechanical damage to the valve port sealing cover caused by excessive pull. The small hole allows air or liquid water to flow between the upper and lower surfaces of the valve port sealing cover, balancing pressure on both sides. The channel can also allow liquid water to enter the upper chamber of the piston, and freeze in severe cold weather to lock the piston, preventing the gas from the high-pressure gas source from pushing the piston upward and forcibly pulling the valve port sealing cover whose lower surface fixed to the piston rod has been solidified and bonded by the liquid water in the water inlet valve port, thereby protecting the valve port sealing cover in severe cold and freezing weather.

[0032] The electromagnetic pneumatic valve for water-cooled brake drums of motor vehicles has a second working air outlet (11); the electromagnetic valve has a check valve (12), and the check valve outlet is the second working air outlet (11). The second working air outlet is connected to the air inlet of the pressure reducing and limiting valve. The check valve is installed in the electromagnetic valve, and its outlet serves as the second working air outlet. This has more advantages than installing a check valve in the air path between the pressure reducing and limiting valve and the electromagnetic pneumatic valve. The pneumatic components are integrated, and the installation of the device for controlling the water spray is also simpler. The check valve has three functions: first, to prevent gas backflow; second, to prevent liquid water in the water tank from backflowing along the air path; and third, to maintain the independent working state of the electromagnetic pneumatic valve on the water branch line, without being affected by the electromagnetic pneumatic valves on other water branches. The gas flowing out of the second working air outlet is the gas that flows to the second working air outlet when the solenoid valve core is opened or closed.

[0033] The solenoid pneumatic valve for water-cooled brake drums in a motor vehicle has a high-pressure air source that flows to a check valve after being controlled by the solenoid valve. This allows the high-pressure air source to flow to the pressure-reducing and pressure-limiting valve to be manually controlled. The valve is only opened to inflate the upper portion of the water tank when water spraying is not required. This prevents air and light leakage from the high-pressure air source during periods when water is not being sprayed. When the valve core of the solenoid valve is in the first position, the air inlet, the second working air outlet, and the first working air outlet are connected, while the exhaust port is closed. When the valve core is in the second position, the second working air outlet is closed, the air inlet is closed, and the exhaust port is opened and connected to the first working air outlet. The solenoid valve can be manufactured as a two-position, four-way reversing valve. The first and second working air outlets are normally closed, while the exhaust port is normally open. Compared to the prior art method in which the first working air outlet is normally open, the present invention reduces the risk of air leakage from the high-pressure air source in practice.

[0034] To achieve multiple water cooling channels for brake drum spraying, the solenoid pneumatic valves and water pipes connected to the brake drums are connected in parallel. The second working outlets of the solenoid pneumatic valves on each water channel are connected in parallel and then connected to a pressure reducing and limiting valve. Each water channel has a check valve that operates independently, providing air from a high-pressure air source to the pressure reducing and limiting valve. This parallel water channel arrangement is very useful because it can split the water cooling task of the numerous brake drums of heavy-duty vehicles into several groups, with each group being served by a separate water channel.

[0035] In the embodiment, the electromagnetic pneumatic valve for water-cooled brake drums of motor vehicles is installed in the air and water circuit structure of the motor vehicle, comprising a high-pressure air source (1) and a water tank (5), a pressure reducing and limiting valve (3), and an electromagnetic pneumatic valve (7). The high-pressure air source (1), the electromagnetic pneumatic valve (7), the pressure reducing and limiting valve (3), and the upper part of the water tank are connected in sequence by air circuit. The second working air outlet is connected to the air inlet of the pressure reducing and limiting valve, and the air outlet of the pressure reducing and limiting valve is connected to the upper part of the water tank. The lower part of the water tank, the electromagnetic pneumatic valve, and the water pipe leading to the brake drum are connected in sequence by water circuit. A large-load motor vehicle has many wheels, and the numerous brake drums can be divided into several groups, each of which is responsible for spraying water cooling by a water branch. An electromagnetic pneumatic valve is connected in series to each water branch. The high-pressure gas of the high-pressure air source is connected to the air inlet of the electromagnetic pneumatic valve on each water branch. The electromagnetic valve electric control circuit of the electromagnetic pneumatic valve on each water branch is independently controlled by an electric control switch, and each electric control switch controls the opening and closing of the electromagnetic pneumatic valve on the water branch. The second working air outlets on the electromagnetic pneumatic valves on each water branch are connected in parallel to the pressure reducing and limiting valves, and the air outlets of the pressure reducing and limiting valves are connected to the water tank and communicate with the upper part of the water tank. The water channel inlets of the electromagnetic pneumatic valves on each water branch are connected in parallel to the water tank and communicate with the bottom of the water tank.

[0036] When brake water spray cooling is required, the driver turns on the electric control switch of the branch circuit for the required water spray, and the valve core of the electromagnetic pneumatic valve on the water branch circuit moves, the exhaust port (43) is closed, and the air inlet (13) is opened. High-pressure gas from the high-pressure gas source (1) flows into the electromagnetic pneumatic valve, and the flow direction inside the electromagnetic pneumatic valve is divided into two paths: one path flows out from the second working air outlet (11) through the check valve; the high-pressure gas flowing out of the electromagnetic pneumatic valve flows to the pressure reducing and limiting valve, and the low-pressure gas after pressure reduction and pressure limiting flows into the upper part of the water tank (5), inflating the water tank, so that the upper surface of the water storage inside the water tank is subjected to the pressure given by the low-pressure gas. This pressure forces the water storage to flow from the bottom of the water tank to the water channel inlet of the electromagnetic pneumatic valve. The other path flows out from the first working air outlet (15) to the piston lower chamber (39), pushing the piston (21) upward. The original gas in the piston upper chamber (41) is compressed and then slowly discharged from the piston rod through hole (25), the small hole (33) and the water channel inlet (35). Under the reaction force of the compressed original gas, the compression spring (29) is slowly further compressed, and the piston rod pulls the valve port sealing cover (31) to move slowly upward and open the water inlet valve port (38) and the water outlet valve port. The pressurized water at the water channel inlet (37) flows out from the water inlet valve port to the water outlet valve port. Under the action of air pressure, the water stored in the water tank is sprayed out from the water pipe leading to the brake drum of this water branch, cooling the brake drum corresponding to this branch.

[0037] When brake water spray cooling is no longer needed, the driver turns off the electronically controlled switch for the water branch circuit. The solenoid valve core of the solenoid pneumatic valve on the water branch circuit moves, opening the exhaust port and simultaneously closing the air inlet, cutting off the high-pressure gas flowing to the pressure reducing limit valve. The upper part of the water tank is no longer affected by the low-pressure gas. The first working air outlet is connected to the exhaust port. Because the high-pressure gas from the high-pressure gas source is no longer acting on the piston's lower chamber, the compression spring begins to expand, pushing the valve port sealing cover toward the water inlet and outlet valve ports while also pulling the piston downward through the piston rod. During the downward movement of the piston, negative pressure appears in the piston's upper chamber. Liquid water and gas from the water channel outlet flow into the piston's upper chamber along the small hole and the piston rod through-hole. In this process, the kinetic energy generated by the compression spring pushing the valve port sealing cover into motion is consumed, causing the valve port sealing cover to slowly close over the water inlet and outlet valve ports, closing the water inlet valve port.

Claims

1. A solenoid pneumatic valve for a water-cooled brake drum of a motor vehicle, comprising a waterway inlet (37), a waterway outlet (35), and a solenoid valve, wherein a valve port sealing cover (31) covers the water inlet valve port (38) and the water outlet valve port, and is sealed and fastened to the valve body around the edges, and a force is applied to the upper surface by one end of a compression spring (29), and the other end of the compression spring abuts against the valve body partition (27); the solenoid valve comprises an exhaust port (43), an air inlet (13), and a first working air outlet (15); and is characterized by: The invention comprises a cylinder (19) which is fixedly connected to the valve body partition (27); a piston rod (23) passes through the valve body partition mounting hole and is sealed and movably connected to the valve body partition mounting hole, and its two ends are respectively fixedly connected to the piston (21) in the cylinder and the valve port sealing cover (31); the piston rod has a piston rod through hole (25) along the axial and radial directions, and the lower end of the piston rod through hole is connected to the water outlet valve port and the water channel connection port (35) through a small hole (33) opened on the valve port sealing cover; the upper end of the piston rod through hole is connected to the cylinder upper chamber (41), and the cylinder lower chamber (39) is connected to the first working air outlet (15).

2. The electromagnetic pneumatic valve for water-cooled brake drum of a motor vehicle according to claim 1, characterized in that It is provided with a second working air outlet (11); the solenoid valve is provided with a check valve (12), and the check valve air outlet is the second working air outlet (11).

3. The electromagnetic pneumatic valve for a water-cooled brake drum of a motor vehicle according to claim 1 or 2, characterized in that The air flow from the high-pressure air source flows to the check valve after being controlled by the switch of the solenoid valve; when the valve core of the solenoid valve is in the first position, the air inlet, the second working air outlet and the first working air outlet are connected, and the exhaust port is closed; when the valve core is in the second position, the second working air outlet is closed, the air inlet is closed, the exhaust port is opened and connected to the first working air outlet.

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