Pressure-limiting parking pile-up valve

Abstract

The utility model relates to the technical field of railway vehicle braking systems, in particular to a pressure-limiting parking pile-up valve. The pressure-limiting parking integrated valve comprises a parking valve and a pressure-limiting valve integrated on the parking valve, a piston cavity is formed in the parking valve, a movable piston part is arranged in the piston cavity, the parking valve is further provided with a first air port, a second air port and an air output port, and the first air port, the second air port and the air output port are communicated with the piston cavity. A first communicating cavity and a second communicating cavity are formed in the pressure limiting valve, the first communicating cavity is communicated with the first air port, and the second communicating cavity is communicated with the air output port; a pressure limiting assembly is further arranged in the pressure limiting valve and located between the first communicating cavity and the second communicating cavity. The technical problem to be solved by the utility model is that in the prior art, a pressure-limiting parking integrated valve with a pressure limiting function is urgently required, and the pressure-limiting parking integrated valve has the function of limiting output air pressure besides the function of connecting or disconnecting an air cylinder and a brake air chamber.

Description

Technical Field

[0001] The utility model relates to the technical field of rail vehicle braking systems, in particular to a pressure-limiting parking integrated valve. Background Art

[0002] In the prior art, a parking memory device for a parking function usually only includes a parking memory valve, which is usually arranged between an air reservoir and a brake air chamber, and is used to connect or cut off the air reservoir and the brake air chamber, thereby turning the brake function on or off. However, the parking memory valve itself does not have a pressure limiting function. When the air pressure in the air reservoir is too high, the parking memory valve connects the air reservoir and the brake air chamber, which will cause excessive air pressure to directly enter the brake air chamber. On the one hand, this may easily cause various components in the brake air chamber to be impacted by the excessive air pressure and deform and fail. On the other hand, it may also cause the brake link to extend excessively and the brake pad to clamp the brake disc excessively, resulting in excessive wear of the brake disc and a shortened service life.

[0003] Therefore, in the prior art, there is an urgent need to propose a pressure-limiting parking integrated valve with a pressure-limiting function, which, in addition to having the function of connecting or disconnecting the air reservoir and the brake air chamber, also has the function of limiting the output air pressure. Utility Model Content

[0004] In view of the technical problems in the prior art: it is urgently necessary to propose a pressure-limiting parking integrated valve with a pressure-limiting function, which not only has the function of connecting or cutting off the air reservoir and the brake air chamber, but also has the function of limiting the output air pressure; the utility model provides a pressure-limiting parking integrated valve.

[0005] The utility model is realized by the following technical solutions:

[0006] The pressure-limiting parking integrated valve comprises a parking valve and a pressure-limiting valve integrated on the parking valve.

[0007] The parking valve is provided with a piston cavity, a movable piston portion is provided in the piston cavity, and the parking valve is also provided with a first gas port, a second gas port, and an output gas port, and the first gas port, the second gas port, and the output gas port are respectively communicated with the piston cavity;

[0008] A first communicating cavity and a second communicating cavity are provided in the pressure limiting valve, wherein the first communicating cavity is communicated with the first gas port, and the second communicating cavity is communicated with the output gas port; a pressure limiting component is also provided in the pressure limiting valve, and the pressure limiting component is located between the first communicating cavity and the second communicating cavity, and the pressure limiting component is used to cut off the first communicating cavity and the second communicating cavity when the gas pressure in the first communicating cavity is higher than or equal to the first preset value, and otherwise connect the first communicating cavity and the second communicating cavity;

[0009] The piston part has a first position and a second position in the piston cavity. When the piston part is in the first position, the output air port is communicated with the second air port. When the piston part is in the second position, the output air port is cut off from the second air port.

[0010] Furthermore, an inner cavity is provided in the pressure limiting valve, and the first connecting cavity and the second connecting cavity are respectively a part of the inner cavity;

[0011] The pressure limiting assembly includes a first valve seat, the first valve seat is connected to the side wall of the inner cavity, and a first valve port is arranged on the first valve seat;

[0012] The pressure limiting assembly further includes a first valve pad, which is movably and inseparably connected to the first valve seat; the lower surface of the first valve pad is one of the surfaces that limits the formation of the first communicating cavity;

[0013] The pressure limiting assembly further includes a pressure regulating unit and a valve core unit, wherein a first end of the valve core unit abuts against the pressure regulating unit, and a section of the valve core unit away from the first end can movably pass through the first valve port and abut against the upper surface of the first valve pad; wherein a position where the section of the valve core unit abuts against the upper surface of the first valve pad is located between the first communicating cavity and the second communicating cavity;

[0014] The pressure limiting assembly further includes a first elastic portion, which is arranged on a side of the first valve pad away from the valve core unit, and is used for elastically supporting the first valve pad;

[0015] A first contact portion is also provided at a section of the valve core unit passing through the first valve port, and a second contact portion is also provided on the first valve seat. The first contact portion and the second contact portion are both located between the first connecting cavity and the second connecting cavity. During the axial movement of the valve core unit, the first contact portion and the second contact portion contact or separate from each other.

[0016] Furthermore, the first contact portion is made of elastic material.

[0017] Furthermore, the valve core unit includes an inner core and an outer core movably sleeved on the outer surface of the inner core, wherein the outer core movably passes through the first valve port and abuts against the upper surface of the first valve pad, the first contact portion is also arranged on the outer core, and there is a distance between the port wall of the first valve port and the inner core;

[0018] The valve core unit further includes a sliding seal portion, the side surface of the sliding seal portion forms a sliding seal with the side wall of the inner cavity, the sliding seal portion is connected to an end of the inner core away from the outer core, and the lower surface of the sliding seal portion is one of the surfaces that limits the formation of the second communication cavity;

[0019] The inner core is also provided with a through passage along the axial direction, and the through passage forms a first hole and a second hole at two axial ends of the inner core respectively;

[0020] The pressure limiting valve is also provided with a pressure relief device, the first hole can be blocked by the first valve pad or separated from the first valve pad, and the second hole is connected to the pressure relief device.

[0021] Furthermore, the pressure relief device includes a breathing port arranged on a side wall of the pressure limiting valve and a one-way dustproof breathing ring arranged in the breathing port.

[0022] Furthermore, the pressure regulating unit includes a pressure regulating bolt threadedly matched with the threaded hole at the top of the pressure limiting valve, an upper pressure plate in contact with the bottom of the pressure regulating bolt, a pressure regulating spring abutting against the bottom of the upper pressure plate, and a lower pressure plate arranged between the pressure regulating spring and the inner core; the pressure regulating bolt regulates the pressure of the pressure regulating spring through the upper pressure plate, and acts on the inner core through the lower pressure plate;

[0023] The lower pressure plate is provided with an air guide hole, and the through passage is communicated with the pressure relief device through the air guide hole.

[0024] Furthermore, a sealing groove is arranged on the side of the sliding sealing part, a special-shaped sealing ring is arranged in the sealing groove, and one side of the special-shaped sealing ring contacts the side wall of the inner cavity.

[0025] Furthermore, the parking valve further comprises a first solenoid valve, a first flow channel is arranged between the gas output port and one end of the piston chamber, a part of the first flow channel passes through the first solenoid valve, and the solenoid valve core unit of the first solenoid valve conducts the first flow channel or cuts off the first flow channel when the power is on or off;

[0026] The parking valve also includes a second solenoid valve; a second flow channel is set between the output air port and the other end of the piston chamber, a part of the second flow channel passes through the second solenoid valve, and the solenoid valve core unit of the second solenoid valve conducts or cuts off the second flow channel when power is on or off.

[0027] Furthermore, the first solenoid valve is provided with a first channel, which is coaxial with and communicates with the piston cavity; and further comprises a first button, wherein a section of the first button is axially movable and arranged in the first channel, and one end of the first button can axially extend into the piston cavity;

[0028] The second solenoid valve is provided with a second channel, which is coaxial with and communicated with the piston cavity; the piston cavity is located between the first channel and the second channel; and also includes a second button, one section of which is axially movably arranged in the second channel, and one end of the second button can be axially extended into the piston cavity.

[0029] Furthermore, the parking valve further comprises a first widened portion, and the first widened portion is connected to an end of the first button away from the piston chamber;

[0030] A first limit surface is provided on the first solenoid valve, and the first limit surface is located between the first widened portion and the piston cavity;

[0031] The parking valve further comprises a first return spring, one end of which abuts against the first widened portion, and the other end of which abuts against the first limit surface.

[0032] Compared with the prior art, the advantages of the present invention are:

[0033] 1. In the prior art, a parking memory device for a parking function usually only includes a parking memory valve, which is usually arranged between an air reservoir and a brake air chamber, and is used to connect or cut off the air reservoir and the brake air chamber, thereby turning the brake function on or off. However, the parking memory valve itself does not have a pressure limiting function. When the air pressure in the air reservoir is too high, the parking memory valve connects the air reservoir and the brake air chamber, which will cause excessive air pressure to directly enter the brake air chamber. On the one hand, this may easily cause various components in the brake air chamber to be impacted by the excessive air pressure and deform and fail. On the other hand, it may also cause the brake connecting rod to extend excessively, the brake pad to clamp the brake disc excessively, resulting in excessive wear of the brake disc and a shortened service life.

[0034] Therefore, in the prior art, there is an urgent need to propose a pressure-limiting parking integrated valve with a pressure-limiting function, which, in addition to having the function of connecting or disconnecting the air reservoir and the brake air chamber, also has the function of limiting the output air pressure.

[0035] In the utility model, a pressure-limited parking integrated valve is proposed, one end of the first air port is connected to the air storage cylinder, and the other end is connected to the first connecting cavity, one end of the second air port is connected to the brake air chamber, and the other end is connected to the output air port, the first connecting cavity and the second connecting cavity have two states of conduction and cutoff through the valve core unit; and the conduction and cutoff of the second air port and the output air port are realized by relying on the position of the piston part in the piston cavity.

[0036] Therefore, in the utility model, the connection and cutoff function between the air reservoir and the brake air chamber has a double layer of insurance: the first layer of insurance is that the piston part in the parking valve is in the position of the piston cavity. When the piston part is in the first position, that is, the piston part is at the leftmost side of the piston cavity, the output gas port is connected with the second gas port. When the piston part is in the second position, that is, the piston part is at the rightmost side of the piston cavity, the output gas port is cut off from the second gas port. The second layer of insurance is that when the air pressure of the first connecting cavity is higher than or equal to the first preset value, the first connecting cavity and the second connecting cavity are cut off. At this time, the new gas in the air reservoir cannot pass through the first gas port and the first connecting cavity and reach the second connecting cavity and the output gas port. This process can also be regarded as the function of cutting off the air reservoir and the brake air chamber. Only when the air pressure of the first connecting cavity is lower than the first preset value, the first connecting cavity and the second connecting cavity are connected. At this time, the new gas in the air reservoir passes through the first gas port and the first connecting cavity and reaches the second connecting cavity and the output gas port. Then, the position of the piston part in the piston cavity is adjusted so that the gas from the second connecting cavity to the output gas port enters or does not enter the brake air chamber.

[0037] In the utility model, the gas in the air reservoir can reach the brake air chamber only when both layers of the above-mentioned insurance are opened, and has a pressure limiting function when passing through the second layer of insurance. Therefore, in summary, the utility model solves the technical problems existing in the prior art: it is urgent to propose a pressure-limiting parking integrated valve with a pressure-limiting function, which, in addition to having the function of being able to connect or cut off the air reservoir and the brake air chamber, also has the function of limiting the output air pressure.

[0038] 2. In the utility model, the pressure limiting valve is integrated on the parking valve, the housing of the pressure limiting valve is detachably connected to the housing of the parking valve, and the connecting pipelines between the parking valve and the pressure limiting valve are arranged inside the combination of the housing of the pressure limiting valve and the housing of the parking valve, thereby avoiding the method of arranging an external pipeline connection outside the combination of the housing of the pressure limiting valve and the housing of the parking valve, thereby avoiding the problem of leakage caused by the external pipelines being easily hit by other components during installation due to the arrangement of a large number of external pipelines.

[0039] Furthermore, this also optimizes the layout of the parking brake system of the whole vehicle and improves the rationality and scientificity of the layout of the parking brake system of the whole vehicle.

[0040] 3. The pressure limiting component of the utility model also includes a pressure regulating unit, which changes the compression amount of the pressure regulating spring by rotating the pressure regulating bolt, thereby changing the force of the first valve pad and the inner core being pushed up by the air pressure, thereby achieving the purpose of adjusting the first preset value and the second preset value; the utility model adjusts the pressure by rotating the pressure regulating bolt, and has the characteristics of a wide pressure regulating range, repeatable pressure regulation, and high pressure regulating accuracy.

[0041] Fourth, the utility model sets a sealing groove on the side of the sliding sealing part, and contacts the side wall of the inner cavity through the special-shaped sealing ring; the special-shaped sealing ring has the characteristics of easy processing, low cost and no burrs.

[0042] 5. In the prior art, in order to avoid damage to the brake air chamber, an air tank with a pressure value lower than a first preset value is usually selected to be connected to the parking memory valve; however, in the utility model, since the pressure-limiting parking integrated valve has a pressure-limiting function, the range of the air pressure in the air tank is much wider than that in the prior art, so that the pressure reserve value of the air tank is richer.

[0043] Furthermore, by using the pressure-limiting parking integrated valve of the utility model, an air reservoir with a higher air pressure can be selected, thereby avoiding the problem of the air reservoir air source not being able to keep up with the air supply due to frequent braking, thereby improving the safety of vehicle driving.

[0044] 6. Since the pressure-limiting parking integrated valve in the utility model has a pressure-limiting function, the gas pressure entering the brake air chamber through the pressure-limiting parking integrated valve of the utility model is relatively small, and is only sufficient to extend the brake connecting rod of the brake air chamber; this also leads to a reduction in the release pressure during driving, reduces the consumption of gas, and achieves the effect of energy saving and emission reduction. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 A structural cross-sectional view of the piston portion of the pressure-limiting parking integrated valve in the first position;

[0046] Figure 2 This is a structural cross-sectional view of the pressure limiting valve of the utility model;

[0047] Figure 3 for Figure 2 Schematic diagram of the structure of the middle A area;

[0048] Figure 4 It is a structural schematic diagram of the valve core unit of the utility model;

[0049] Figure 5 for Figure 2 Schematic diagram of the structure of the middle B area;

[0050] Figure 6 A structural cross-sectional view of the piston portion of the pressure-limiting parking integrated valve in the second position;

[0051] Figure 7 It is a structural schematic diagram of the pressure limiting valve of the utility model in the air intake state;

[0052] Figure 8 It is a structural schematic diagram of the pressure limiting valve in a balanced state of the utility model;

[0053] Fig. 9 It is a structural schematic diagram of the pressure-limiting valve of the utility model in the pressure-releasing state.

[0054] Markings in the figure: parking valve 1, pressure limiting valve 2,

[0055] Piston cavity 101, piston portion 102, first air port 103, second air port 104, output air port 105, first flow channel 106, first solenoid valve 107, second solenoid valve 108, second flow channel 109, first channel 110, first button 111, second channel 112, second button 113, first widened portion 114, first limiting surface 115, first return spring 116, connecting pipe 117, third air port 118;

[0056] The first connecting chamber 201, the second connecting chamber 202, the first valve seat 203, the inner chamber 204, the first valve port 205, the first valve pad 206, the pressure regulating unit 207, the valve core unit 208, the first elastic portion 209, the first contact portion 210, the second contact portion 211, the sliding sealing portion 212, the inner core 213, the outer core 214, the through channel 215, the first hole 216, the second hole 217, the pressure relief device 218, the breathing port 219, the one-way dustproof breathing ring 220, the pressure regulating bolt 221, the upper pressure plate 222, the pressure regulating spring 223, the lower pressure plate 224, the air guide hole 225, the sealing groove 226, the special-shaped sealing ring 227, the first clamping portion 228, the bottom support 229, and the second clamping portion 230. DETAILED DESCRIPTION

[0057] The following is a further non-restrictive detailed description of the utility model technical solution in conjunction with the preferred embodiment and its accompanying drawings. In the description of the utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings. In addition, the terms "first" and "second" are used only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the utility model, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the utility model, and cannot be understood as limitations on the utility model.

[0058] Example 1

[0059] like Figure 1As shown, this embodiment proposes a pressure-limited parking integrated valve, which includes a parking valve 1 and a pressure-limiting valve 2 integrated on the parking valve 1, wherein a piston chamber 101 is provided in the parking valve 1, and a movable piston portion 102 is provided in the piston chamber 101, and the parking valve 1 is further provided with a first gas port 103, a second gas port 104, and an output gas port 105, and the first gas port 103, the second gas port 104, and the output gas port 105 are respectively communicated with the piston chamber 101; a first communicating chamber 201 and a second communicating chamber 202 are provided in the pressure-limiting valve 2, wherein the first communicating chamber 201 is communicated with the first gas port 103, and the second communicating chamber 202 is communicated with the output gas port 103. 05 are connected; a pressure limiting component is also provided in the pressure limiting valve 2, and the pressure limiting component is located between the first connecting chamber 201 and the second connecting chamber 202. The pressure limiting component is used to cut off the first connecting chamber 201 and the second connecting chamber 202 when the air pressure in the first connecting chamber 201 is higher than or equal to a first preset value, and vice versa to connect the first connecting chamber 201 and the second connecting chamber 202; the piston part 102 has a first position and a second position in the piston chamber 101, when the piston part 102 is in the first position, the output air port 105 is connected to the second air port 104, and when the piston is in the second position, the output air port 105 is cut off from the second air port 104.

[0060] The parking valve 1 is a main component of the parking memory device, which is usually arranged between the air reservoir and the brake air chamber, and is used to connect or cut off the air reservoir and the brake air chamber, thereby turning the braking function on or off.

[0061] The parking valve 1 is provided with a first air port 103, a second air port 104, and an output air port 105, wherein preferably, the first air port 103 and the second air port 104 are both provided on the same side, and the output air port 105 is provided on the other side. The conduction and cutoff between the output air port 105 and the second air port 104 are achieved by changing the position of the piston portion 102 in the piston chamber 101. When the piston portion 102 is in the first position, the output air port 105 is communicated with the second air port 104, and when the piston is in the second position, the output air port 105 is cut off from the second air port 104.

[0062] In this embodiment, the piston portion 102 is in the first position, that is, Figure 1 The middle piston portion 102 is at the leftmost end of the piston chamber 101; the piston portion 102 is in the second position, that is, Figure 6 The piston portion 102 is located at the rightmost end of the piston chamber 101 .

[0063] The pressure limiting valve 2 is integrated on the parking valve 1. Specifically, the housing of the pressure limiting valve 2 is detachably connected to the housing of the parking valve 1, and the first connecting chamber 201 in the pressure limiting valve 2 is connected to the first air port 103 of the parking valve 1, and the second connecting chamber 202 in the pressure limiting valve 2 is connected to the output air port 105 of the parking valve 1. The pressure limiting component in the pressure limiting valve 2 is used to cut off the first connecting chamber 201 and the second connecting chamber 202, thereby connecting or cutting off the first air port 103 and the output air port 105. The connection and disconnection between the output air port 105 and the second air port 104 is achieved by adjusting the position of the piston part 102. Furthermore, the first connecting chamber 201 and the first air port 103 are connected by Figure 1 The middle connecting pipe 117 is connected.

[0064] like Figure 1-2 As shown, the structure of the pressure limiting component is as follows: an inner cavity 204 is arranged in the pressure limiting valve 2, and the first connecting cavity 201 and the second connecting cavity 202 are respectively parts of the inner cavity 204; the pressure limiting component includes a first valve seat 203, the first valve seat 203 is connected to the side wall of the inner cavity 204, and a first valve port 205 is arranged on the first valve seat 203; the pressure limiting component also includes a first valve pad 206, and the first valve pad 206 is movably and inseparable connected to the first valve seat 203; the lower surface of the first valve pad 206 is one of the surfaces for limiting the formation of the first connecting cavity 201; the pressure limiting component also includes a pressure regulating unit 207 and a valve core unit 208, a first end of the valve core unit 208 is in contact with the pressure regulating unit 207, and one section of the valve core unit 208 away from the first end can movably pass through the first valve port 205 and connect with the first valve pad 20 6; wherein, a section of the valve core unit 208 abuts against the upper surface of the first valve pad 206, and is located between the first connecting cavity 201 and the second connecting cavity 202; the pressure limiting component also includes a first elastic portion 209, and the first elastic portion 209 is arranged on the side of the first valve pad 206 away from the valve core unit 208, and the first elastic portion 209 is used to elastically support the first valve pad 206; a section of the valve core unit 208 passing through the first valve port 205 is also provided with a first contact portion 210, and a second contact portion 211 is also provided on the first valve seat 203, and the first contact portion 210 and the second contact portion 211 are both located between the first connecting cavity 201 and the second connecting cavity 202, and during the axial movement of the valve core unit 208, the first contact portion 210 and the second contact portion 211 contact or separate from each other.

[0065] like Figure 2-3As shown, further, the "first valve pad 206 is movably and inseparable from the first valve seat 203" mentioned above is actually in an inseparable state during the use of the pressure limiting valve 2, and is detachable and disassembled before leaving the factory and during maintenance. Specifically, the first valve seat 203 is provided with a first clamping portion 228; the pressure limiting valve 2 also includes a base 229, and the base 229 is provided with a second clamping portion 230. The base 229 is movably and inseparablely arranged on the first valve seat 203 through the first clamping portion 228 and the second clamping portion 230; the first elastic portion 209 is preferably a spring, and one end of the first elastic portion 209 abuts against the lower surface of the first valve pad 206, and the other end abuts against the upper surface of the base 229.

[0066] Furthermore, the first valve gasket 206 is composed of a combination of multiple materials. For example, in this embodiment, the first valve gasket 206 is composed of three layers of plates made of different materials, wherein the material of the top layer, that is, the plate that abuts against the valve core unit 208, is made of elastic material, such as rubber.

[0067] Furthermore, the first contact portion 210 is made of an elastic material, for example, the first contact portion 210 is an elastic gasket made of a rubber material, and the first contact portion 210 is detachably connected to the valve core unit 208 .

[0068] The air pressure in the second connecting chamber 202 may sometimes increase abnormally during use. For example, when the middle sealing ring on the outer surface of the piston part 102 fails, the second connecting chamber 202 may be connected in series to the second air port 104, resulting in an unexpected increase in the pressure in the second connecting chamber 202. If the high pressure in the second connecting chamber 202 enters the brake air chamber through the output air port 105 and the second air port 104, it is easy to cause the internal components of the brake air chamber to be damaged by excessive pressure. This embodiment also has a pressure relief function. When the air pressure in the second connecting chamber 202 is higher than or equal to the second preset value, the pressure limiting valve 2 of this embodiment can timely release the high pressure in the second connecting chamber 202 to protect the brake air chamber. The specific scheme is as follows:

[0069] like Figure 1 , Figure 2 , Figure 4As shown, the valve core unit 208 includes an inner core 213 and an outer core 214 that is movably sleeved on the outer surface of the inner core 213, wherein the outer core 214 is movably passed through the first valve port 205 and abuts against the upper surface of the first valve pad 206, and the first contact portion 210 is also arranged on the outer core 214, and there is a distance between the mouth wall of the first valve port 205 and the inner core 213; the valve core unit 208 also includes a sliding sealing portion 212, and the side surface of the sliding sealing portion 212 forms a sliding seal with the side wall of the inner cavity 204, and the sliding sealing portion 212 is provided on the outer core 214. 2 is connected to one end of the inner core 213 away from the outer core 214, and the lower surface of the sliding sealing portion 212 is one of the surfaces that limits the formation of the second connecting cavity 202; the inner core 213 is also provided with an axial through channel 215, and the through channel 215 forms a first hole 216 and a second hole 217 at the axial ends of the inner core 213 respectively; the pressure limiting valve 2 is also provided with a pressure relief device 218, the first hole 216 can be blocked by the first valve pad 206 or separated from the first valve pad 206, and the second hole 217 is connected to the pressure relief device 218.

[0070] Furthermore, it can be concluded meaninglessly from the above content that: along the radial direction of the valve core unit 208, there is a gap between the first valve pad 206 and the first valve seat 203, there is a gap between the outer core 214 and the first valve seat 203, there is a gap between the mouth wall of the first valve port 205 and the inner core 213, and there is a gap between the inner core 213 and the outer core 214; the inner core 213 can choose to abut against or separate from the upper surface of the first valve pad 206.

[0071] like Figure 5 As shown, further, the pressure relief device 218 includes a breathing port 219 arranged on a side wall of the pressure limiting valve 2 and a one-way dust-proof breathing ring 220 arranged in the breathing port 219; the one-way dust-proof breathing ring 220 is elastic, for example, it is a bowl-shaped structure made of rubber, and has a one-way conduction function, and the direction of the one-way conduction is from the inside of the pressure limiting valve 2 toward the outside of the pressure limiting valve 2.

[0072] like Figure 2 , Figure 4 As shown, further, a sealing groove 226 is provided on the side of the sliding sealing portion 212, and a special-shaped sealing ring 227 is provided in the sealing groove 226, and one side of the special-shaped sealing ring 227 contacts the side wall of the inner cavity 204. The special-shaped sealing ring 227 of this embodiment adopts an S-shaped sealing ring, which has a pre-tightening force along the radial direction of the pressure limiting component, can fit more closely with the side wall of the inner cavity 204, and has a better sealing effect.

[0073] like Figure 1-2As shown, further, the specific structure of the pressure regulating unit 207 is as follows: the pressure regulating unit 207 includes a pressure regulating bolt 221 threadedly matched with the threaded hole at the top of the pressure limiting valve 2, an upper pressure plate 222 in contact with the bottom of the pressure regulating bolt 221, a pressure regulating spring 223 abutting against the bottom of the upper pressure plate 222, and a lower pressure plate 224 arranged between the pressure regulating spring 223 and the inner core 213; the pressure regulating bolt 221 regulates the pressure of the pressure regulating spring 223 through the upper pressure plate 222, and acts on the inner core 213 through the lower pressure plate 224; the lower pressure plate 224 is provided with an air guide hole 225, and the through channel 215 is connected with the pressure relief device 218 through the air guide hole 225.

[0074] Furthermore, it is mentioned in the foregoing that the piston portion 102 has a first position and a second position in the piston chamber 101. The switching of the piston portion 102 in the piston chamber 101 between the first position and the second position can be achieved by relying on the following two technical solutions.

[0075] The first one is the electronic control method: Figure 1 , Figure 6 As shown, the pressure-limiting parking integrated valve includes a first solenoid valve 107, a first flow channel 106 is set between the output air port 105 and one end of the piston chamber 101, a part of the first flow channel 106 passes through the first solenoid valve 107, and the solenoid valve core unit of the first solenoid valve 107 conducts the first flow channel 106 or cuts off the first flow channel 106 when the power is on or off; it also includes a second solenoid valve 108; a second flow channel 109 is set between the output air port 105 and the other end of the piston chamber 101, a part of the second flow channel 109 passes through the second solenoid valve 108, and the solenoid valve core unit of the second solenoid valve 108 conducts the second flow channel 109 or cuts off the second flow channel 109 when the power is on or off.

[0076] Among them, the solenoid valve core unit structures of the first solenoid valve 107 and the second solenoid valve 108 are consistent and are both existing technologies, which will not be described here.

[0077] The second method is manual: Figure 1 , Figure 6As shown, the structure of the manual mode is designed on the basis of the electric control mode, and is used when the electric control mode is closed or fails. The first solenoid valve 107 is provided with a first channel 110, which is coaxial with and communicated with the piston chamber 101; it also includes a first button 111, one section of which is axially movable in the first channel 110, and one end of which can be axially extended into the piston chamber 101; the second solenoid valve 108 is provided with a second channel 112, which is coaxial with and communicated with the piston chamber 101; the piston chamber 101 is located between the first channel 110 and the second channel 112; it also includes a second button 113, one section of which is axially movable in the second channel 112, and one end of which can be axially extended into the piston chamber 101.

[0078] Furthermore, the pressure-limiting parking integrated valve also includes a first widened portion 114, which is connected to the end of the first button 111 facing away from the piston chamber 101; a first limiting surface 115 is set on the first solenoid valve 107, and the first limiting surface 115 is located between the first widened portion 114 and the piston chamber 101; and also includes a first return spring 116, one end of the first return spring 116 abuts against the first widened portion 114, and the other end abuts against the first limiting surface 115.

[0079] After the first button 111 is pressed, the first button 111 can be returned to its original position by the first return spring 116 after the external force of the press disappears.

[0080] Correspondingly, a second return spring is also provided at the second button 113 . The arrangement manner and structure of the second return spring are consistent with those of the first return spring 116 , and are not elaborated herein.

[0081] like Figure 1 As shown, further, the parking valve 1 is further provided with a third air port 118, which is provided on the same side as the first air port 103 and the second air port 104, the second air port 104 is located between the first air port 103 and the third air port 118, and the third air port 118 is an exhaust end for being directly connected to the atmosphere; Figure 6 As shown, only when the piston portion 102 is at the rightmost end of the piston cavity 101 , the third gas port 118 is in communication with the second gas port 104 .

[0082] In this embodiment, the first preset value and the second preset value can be set according to specific usage conditions, and are not limited here. One end of the first air port 103 is connected to the air reservoir, and the other end is connected to the first connecting cavity 201. One end of the second air port 104 is connected to the brake air chamber, and the other end is connected to the output air port 105.

[0083] The operating conditions of the pressure limiting valve 2 of this embodiment are as follows:

[0084] Intake state: Combined Figure 1 , Figure 7 As shown, the pressure of the gas is lower than the first preset value, and the gas enters the first connecting cavity 201 from the first gas port 103, passes through the gap between the first valve pad 206 and the first valve seat 203, the gap between the outer core 214 and the first valve seat 203, the gap between the mouth wall of the first valve port 205 and the inner core 213, enters the second connecting cavity 202, and reaches the output gas port 105.

[0085] Balanced state: combined Figure 1 , Figure 8 As shown, the gas pressure has just reached the first preset value, and the gas enters the first connecting chamber 201 from the first gas port 103. The gas pressure acts on the bottom of the first valve pad 206, and pushes the valve core unit 208 upward through the first valve pad 206 until the inner core 213 and the outer core 214 are in contact with the first valve pad 206, and the first contact portion 210 and the second contact portion 211 are in contact with each other; at this time, the first connecting chamber 201 and the second connecting chamber 202 are cut off by the first contact portion 210 and the second contact portion 211 that are in contact with each other, and the gas in the first connecting chamber 201 cannot flow to the second connecting chamber 202, so the gas pressure in the second connecting chamber 202 will not rise, and remains at the first preset value.

[0086] Pressure relief state: combined Figure 1 , Fig. 9 As shown, after the equilibrium state, if the air pressure in the second connecting chamber 202 rises abnormally and exceeds the first preset value, the air pressure in the second connecting chamber 202 acts on the lower surface of the sliding sealing portion 212, so that the sliding sealing portion 212 drives the inner core 213 to move upward together, and the inner core 213 is separated from the first valve pad 206, and the through channel 215 is opened. The gas in the second connecting chamber 202 passes through the gap between the inner core 213 and the outer core 214, the through channel 215, the air guide hole 225, and pushes open the special-shaped sealing ring 227, and is discharged to the outside of the pressure limiting valve 2.

[0087] The use conditions of the parking valve 1 of this embodiment are as follows:

[0088] Electronically controlled release: Figure 6 As shown, when the vehicle stops running and is in the parking state, the piston part 102 is at the rightmost end of the piston chamber 101. At this time, the second air port 104 is connected to the third air port 118, and there is no air pressure at the parking execution end. The driver initiates a designated release intention operation, and the ECU or other electronically controlled switch drives the second solenoid valve 108 to energize. The solenoid valve core unit of the second solenoid valve 108 is lifted upward, and the second flow channel 109 is connected. The gas in the second flow channel 109 is filled into the right side of the piston part 102, and then the piston part 102 is pushed to the left until the piston part 102 is pushed to the leftmost end of the piston chamber 101, as shown in FIG. Figure 1 At this time, the second air port 104 communicates with the second connecting cavity 202 through the output air port 105, and the parking execution end starts to inflate and release the vehicle.

[0089] Electric parking: When the vehicle is in the released state, the piston portion 102 is at the leftmost end of the piston chamber 101. Figure 1 As shown, at this time, the second gas port 104 is connected to the second communication chamber 202 through the output gas port 105, and there is air pressure at the parking execution end. The driver initiates the designated parking intention operation, and the ECU or other electronically controlled switch drives the first solenoid valve 107 to energize, and the solenoid valve core unit of the first solenoid valve 107 is lifted upward, thereby opening the first flow channel 106, and the gas in the first flow channel 106 is filled into the left side of the piston part 102, thereby pushing the piston part 102 to the right, until the piston part 102 is pushed to the rightmost end of the piston chamber 101, as shown in FIG. Figure 6 As shown, at this time, the second air port 104 is connected to the third air port 118, and the parking execution end starts to release air to park the vehicle.

[0090] Manual release: When the vehicle is in the parking state, the piston portion 102 is at the rightmost end of the piston chamber 101, such as Figure 6 As shown, at this time, the second air port 104 is connected to the third air port 118, and there is no air pressure at the parking execution end; the second button 113 is pressed, and the second button 113 pushes the piston part 102 to the leftmost end of the piston cavity 101, as shown in FIG. Figure 1 As shown, at this time, the second air port 104 is connected to the second communication chamber 202, and the parking execution end starts to inflate and release the vehicle;

[0091] Manual parking: Figure 1 As shown, when the vehicle is in the released state, the piston part 102 is at the leftmost end of the piston chamber 101. At this time, the second air port 104 is connected to the second connecting chamber 202, and there is air pressure at the parking execution end. Pressing the first button 111 pushes the piston part 102 to the rightmost end of the piston chamber 101. Figure 6 As shown, at this time, the second air port 104 begins to be connected to the third air port 118, and the parking execution end begins to deflate to park the vehicle.

[0092] Among them, manual release and manual parking are usually used when the vehicle is powered off, such as during vehicle maintenance.

[0093] Advantages of the utility model:

[0094] 1. In the prior art, a parking memory device for a parking function usually only includes a parking memory valve, which is usually arranged between an air reservoir and a brake air chamber, and is used to connect or cut off the air reservoir and the brake air chamber, thereby turning the brake function on or off. However, the parking memory valve itself does not have a pressure limiting function. When the air pressure in the air reservoir is too high, the parking memory valve connects the air reservoir and the brake air chamber, which will cause excessive air pressure to directly enter the brake air chamber. On the one hand, this may easily cause various components in the brake air chamber to be impacted by the excessive air pressure and deform and fail. On the other hand, it may also cause the brake connecting rod to extend excessively, the brake pad to clamp the brake disc excessively, resulting in excessive wear of the brake disc and a shortened service life.

[0095] Therefore, in the prior art, there is an urgent need to propose a pressure-limiting parking integrated valve with a pressure-limiting function, which, in addition to having the function of connecting or disconnecting the air reservoir and the brake air chamber, also has the function of limiting the output air pressure.

[0096] In the present embodiment, a pressure-limited parking integrated valve is proposed, in which one end of the first air port 103 is connected to the air storage cylinder, and the other end is connected to the first connecting cavity 201, one end of the second air port 104 is connected to the brake air chamber, and the other end is connected to the output air port 105, and the first connecting cavity 201 and the second connecting cavity 202 have two states of conduction and cutoff through the valve core unit 208; and the conduction and cutoff of the second air port 104 and the output air port 105 are achieved by relying on the position of the piston part 102 in the piston cavity 101.

[0097] Therefore, in this embodiment, the functions of conduction and cutoff between the air reservoir and the brake air chamber have double insurance: the first insurance is that the piston portion 102 in the parking valve 1 is in the position of the piston cavity 101. When the piston portion 102 is in the first position, that is, the piston portion 102 is at the leftmost side of the piston cavity 101, the output gas port 105 is connected to the second gas port 104; when the piston portion 102 is in the second position, that is, the piston portion 102 is at the rightmost side of the piston cavity 101, the output gas port 105 is cut off from the second gas port 104. The second layer of insurance is that when the air pressure in the first communicating chamber 201 is higher than or equal to the first preset value, the first communicating chamber 201 and the second communicating chamber 202 are cut off. At this time, the new gas in the air cylinder cannot pass through the first air port 103 and the first communicating chamber 201 and reach the second communicating chamber 202 and the output air port 105. This process can also be regarded as a function of cutting off the air cylinder and the brake air chamber. Only when the air pressure in the first communicating chamber 201 is lower than the first preset value, the first communicating chamber 201 and the second communicating chamber 202 are connected. At this time, the new gas in the air cylinder passes through the first air port 103 and the first communicating chamber 201 and reaches the second communicating chamber 202 and the output air port 105. Then, the piston part 102 is adjusted to be in the position of the piston chamber 101, so that the gas from the second communicating chamber 202 reaches the output air port 105 and enters or does not enter the brake air chamber.

[0098] In this embodiment, the gas in the air reservoir can reach the brake air chamber only when both layers of insurance are opened, and has a pressure limiting function when passing through the second layer of insurance. Therefore, in summary, this embodiment solves the technical problems existing in the prior art: it is urgent to propose a pressure-limiting parking integrated valve with a pressure-limiting function, which, in addition to having the function of connecting or disconnecting the air reservoir and the brake air chamber, also has the function of limiting the output air pressure.

[0099] 2. In the present embodiment, the pressure limiting valve 2 is integrated on the parking valve 1, and the outer shell of the pressure limiting valve 2 is detachably connected to the outer shell of the parking valve 1, and the connecting pipelines between the parking valve 1 and the pressure limiting valve 2 are arranged inside the combination of the outer shell of the pressure limiting valve 2 and the outer shell of the parking valve 1, thereby avoiding the method of arranging an external pipeline connection outside the combination of the outer shell of the pressure limiting valve 2 and the outer shell of the parking valve 1, thereby avoiding the problem of leakage caused by the external pipelines being easily hit by other components during installation due to the arrangement of a large number of external pipelines.

[0100] Furthermore, this also optimizes the layout of the parking brake system of the whole vehicle and improves the rationality and scientificity of the layout of the parking brake system of the whole vehicle.

[0101] 3. The pressure limiting component of this embodiment also includes a pressure regulating unit 207, which changes the compression amount of the pressure regulating spring 223 by rotating the pressure regulating bolt 221, thereby changing the force of the first valve pad 206 and the inner core 213 being pushed up by the air pressure, thereby achieving the purpose of adjusting the first preset value and the second preset value; this embodiment adjusts the pressure by rotating the pressure regulating bolt 221, and has the characteristics of a wide pressure regulating range, repeatable pressure regulation, and high pressure regulating accuracy.

[0102] Fourth, in this embodiment, a sealing groove 226 is provided on the side of the sliding sealing portion 212, and contacts the side wall of the inner cavity 204 through a special-shaped sealing ring 227; the special-shaped sealing ring 227 has the characteristics of easy processing, low cost and no burrs.

[0103] 5. In the prior art, in order to avoid damage to the brake air chamber, it is usually necessary to select an air tank with a pressure value lower than the first preset value to be connected to the parking memory valve; in this embodiment, since the pressure-limiting parking integrated valve has a pressure-limiting function, the range of the air pressure in the air tank is much wider than that in the prior art, so that the pressure reserve value of the air tank is richer.

[0104] Furthermore, by using the pressure-limiting parking integrated valve of this embodiment, an air cylinder with a higher air pressure can be selected. This can avoid the problem of the air source of the air cylinder not being able to keep up with the air supply due to frequent braking, thereby improving the safety of vehicle driving.

[0105] 6. Since the pressure-limiting parking integrated valve in this embodiment has a pressure-limiting function, the gas pressure entering the brake air chamber through the pressure-limiting parking integrated valve in this embodiment is relatively small, and is only sufficient to extend the brake connecting rod of the brake air chamber; this also leads to a reduction in the release pressure during driving, reduces the consumption of gas, and achieves the effect of energy saving and emission reduction.

[0106] The above embodiments only express several implementation methods of the utility model, and the descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. The pressure-limited parking integrated valve is characterized by: The invention comprises a parking valve (1) and a pressure limiting valve (2) integrated on the parking valve (1). A piston chamber (101) is provided in the parking valve (1), a movable piston portion (102) is provided in the piston chamber (101), and the parking valve (1) is further provided with a first air port (103), a second air port (104), and an output air port (105), and the first air port (103), the second air port (104), and the output air port (105) are respectively communicated with the piston chamber (101); A first connecting cavity (201) and a second connecting cavity (202) are provided in the pressure limiting valve (2), wherein the first connecting cavity (201) is communicated with the first air port (103), and the second connecting cavity (202) is communicated with the output air port (105); a pressure limiting component is also provided in the pressure limiting valve (2), and the pressure limiting component is located between the first connecting cavity (201) and the second connecting cavity (202), and the pressure limiting component is used to cut off the first connecting cavity (201) and the second connecting cavity (202) when the air pressure in the first connecting cavity (201) is higher than or equal to a first preset value, and otherwise connect the first connecting cavity (201) and the second connecting cavity (202); The piston part (102) has a first position and a second position in the piston chamber (101); when the piston part (102) is in the first position, the gas output port (105) is in communication with the second gas port (104); when the piston part (102) is in the second position, the gas output port (105) is disconnected from the second gas port (104).

2. The pressure-limited parking integrated valve according to claim 1, characterized in that: An inner cavity (204) is provided in the pressure-limiting valve (2), and the first connecting cavity (201) and the second connecting cavity (202) are respectively parts of the inner cavity (204); The pressure limiting component comprises a first valve seat (203), the first valve seat (203) being connected to the side wall of the inner cavity (204), and a first valve port (205) being arranged on the first valve seat (203); The pressure limiting component further comprises a first valve pad (206), the first valve pad (206) being movably and inseparably connected to the first valve seat (203); the lower surface of the first valve pad (206) is one of the surfaces that limits the formation of the first connecting cavity (201); The pressure limiting assembly further comprises a pressure regulating unit (207) and a valve core unit (208); a first end of the valve core unit (208) is in contact with the pressure regulating unit (207); a section of the valve core unit (208) away from the first end can movably pass through the first valve port (205) and is in contact with the upper surface of the first valve pad (206); wherein the position where the section of the valve core unit (208) is in contact with the upper surface of the first valve pad (206) is located between the first connecting cavity (201) and the second connecting cavity (202); The pressure limiting assembly further comprises a first elastic portion (209), the first elastic portion (209) being arranged on a side of the first valve pad (206) away from the valve core unit (208), the first elastic portion (209) being used to elastically support the first valve pad (206); A section of the valve core unit (208) passing through the first valve port (205) is also provided with a first contact portion (210), and a second contact portion (211) is also provided on the first valve seat (203). The first contact portion (210) and the second contact portion (211) are both located between the first connecting cavity (201) and the second connecting cavity (202). During the axial movement of the valve core unit (208), the first contact portion (210) and the second contact portion (211) contact or separate from each other.

3. The pressure-limited parking integrated valve according to claim 2, characterized in that: The first contact portion (210) is made of elastic material.

4. The pressure-limited parking integrated valve according to claim 2 or 3, characterized in that: The valve core unit (208) comprises an inner core (213) and an outer core (214) movably sleeved on the outer surface of the inner core (213), wherein the outer core (214) movably passes through the first valve port (205) and abuts against the upper surface of the first valve pad (206), and the first contact portion (210) is also arranged on the outer core (214), and there is a distance between the port wall of the first valve port (205) and the inner core (213); The valve core unit (208) further comprises a sliding seal portion (212), the side surface of the sliding seal portion (212) forms a sliding seal with the side wall of the inner cavity (204), the sliding seal portion (212) is connected to an end of the inner core (213) facing away from the outer core (214), and the lower surface of the sliding seal portion (212) is one of the surfaces that restricts the formation of the second connecting cavity (202); The inner core (213) is further provided with a through channel (215) along the axial direction, and the through channel (215) forms a first hole (216) and a second hole (217) at two axial ends of the inner core (213), respectively; The pressure-limiting valve (2) is further provided with a pressure relief device (218); the first hole (216) can be blocked by the first valve pad (206) or separated from the first valve pad (206); and the second hole (217) is in communication with the pressure relief device (218).

5. The pressure-limited parking integrated valve according to claim 4, characterized in that: The pressure relief device (218) comprises a breathing port (219) arranged on a side wall of the pressure limiting valve (2) and a one-way dustproof breathing ring (220) arranged in the breathing port (219).

6. The pressure-limited parking integrated valve according to claim 4, characterized in that: The pressure regulating unit (207) comprises a pressure regulating bolt (221) threadedly matched with the threaded hole at the top of the pressure limiting valve (2), an upper pressure plate (222) in contact with the bottom of the pressure regulating bolt (221), a pressure regulating spring (223) abutting against the bottom of the upper pressure plate (222), and a lower pressure plate (224) arranged between the pressure regulating spring (223) and the inner core (213); the pressure regulating bolt (221) regulates the pressure of the pressure regulating spring (223) through the upper pressure plate (222), and acts on the inner core (213) through the lower pressure plate (224); The lower pressure plate (224) is provided with an air guide hole (225), and the through channel (215) is connected to the pressure relief device (218) through the air guide hole (225).

7. The pressure-limited parking integrated valve according to claim 4, characterized in that: A sealing groove (226) is provided on the side of the sliding sealing portion (212), a special-shaped sealing ring (227) is provided in the sealing groove (226), and one side of the special-shaped sealing ring (227) is in contact with the side wall of the inner cavity (204).

8. The pressure-limited parking integrated valve according to claim 1, characterized in that: The parking valve (1) further comprises a first solenoid valve (107), a first flow channel (106) being arranged between the gas output port (105) and one end of the piston chamber (101), a portion of the first flow channel (106) passing through the first solenoid valve (107), and a solenoid valve core unit of the first solenoid valve (107) conducting the first flow channel (106) or cutting off the first flow channel (106) when power is on or off; The parking valve (1) further comprises a second solenoid valve (108); a second flow channel (109) is arranged between the gas output port (105) and the other end of the piston chamber (101); a portion of the second flow channel (109) passes through the second solenoid valve (108); and the solenoid valve core unit of the second solenoid valve (108) conducts the second flow channel (109) or cuts off the second flow channel (109) when power is on or off.

9. The pressure-limited parking integrated valve according to claim 8, characterized in that: The first solenoid valve (107) is provided with a first channel (110), the first channel (110) is coaxial with and communicates with the piston chamber (101); and further comprises a first button (111), a section of which is axially movable in the first channel (110), and one end of which can axially extend into the piston chamber (101); The second solenoid valve (108) is provided with a second channel (112), the second channel (112) is coaxial with and communicates with the piston chamber (101); the piston chamber (101) is located between the first channel (110) and the second channel (112); and further comprises a second button (113), one section of which is axially movable in the second channel (112), and one end of which can axially extend into the piston chamber (101).

10. The pressure-limited parking integrated valve according to claim 9, characterized in that: The parking valve (1) further comprises a first widened portion (114), the first widened portion (114) being connected to an end of the first button (111) facing away from the piston chamber (101); A first limit surface (115) is provided on the first solenoid valve (107), and the first limit surface (115) is located between the first widened portion (114) and the piston chamber (101); The parking valve (1) further comprises a first return spring (116), one end of the first return spring (116) abuts against the first widened portion (114), and the other end abuts against the first limit surface (115).

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