A pressure regulating relay valve

Abstract

The present invention discloses a pressure-regulating relay valve, which divides a relay piston into three sections to form a first pressure-regulating chamber and a control chamber. A pressure-regulating structure is arranged between the first pressure-regulating chamber and the control chamber. When the brake pedal is pressed, the air pressure of the brake master valve enters through the control inlet to push the relay piston to move. The pressure of the gas entering the control chamber and the first pressure-regulating chamber is changed by the pressure-regulating structure to realize the output of the pressure in the control chamber and realize the output of different brake pressures by the brake air chamber, so as to realize the functions of light braking with light stepping and heavy braking with heavy stepping, thereby solving the problem of weak brakes of large and heavy trucks in the domestic market.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a pressure regulating relay valve. Background Art

[0002] The relay valve is part of the automobile air brake system. Its air inlet is connected to the air reservoir and its air outlet is connected to the brake chamber. When the brake pedal is pressed, the output air pressure of the brake valve is used as the control pressure input of the relay valve. Under the control pressure, the air inlet valve is pushed open, so the compressed air enters the brake chamber directly from the air reservoir through the air inlet without flowing through the brake valve, which greatly shortens the inflation line of the brake chamber and accelerates the restart process of the chamber. For example, Chinese patent document CN102481919A discloses a relay valve device, which comprises a housing, a relay piston arranged in the housing and capable of longitudinal movement, a working valve device capable of being operated by the exciting piston, an outlet cavity between the relay piston and the working valve device, and an intermediate wall arranged in the outlet cavity, wherein the intermediate wall divides the outlet cavity into a cavity on the relay piston side and a relay working cavity away from the relay piston, wherein the working valve device is provided with a device for balancing the pressure between the relay working cavities, and the intermediate wall is integrally constructed with the valve seat of the working valve device as a combined intermediate wall-valve seat device. While achieving braking, the above-mentioned relay valve device is integrated with the combined intermediate wall-valve seat device, so that the internal components of the relay valve are simple in structure, easy to install, and can reduce the piston self-vibration of the relay piston. However, the above-mentioned relay valve device cannot achieve pressure-adjusting braking, and it is difficult to solve the problem of weak braking of heavy-duty vehicles. In order to solve this problem, Chinese patent document CN207510415U discloses an emergency relay valve with a pressure regulating function, which includes an upper cover, a control piston, a second piston, a leather cup, a first spring, a lower shell and an exhaust seat. A pressure regulating device is provided on the upper cover, and the pressure regulating device includes a second valve, a second spring, a first piston, a pressure regulating spring and an adjusting screw. The above-mentioned emergency relay valve adjusts the air pressure of the output port by setting a pressure regulating device to achieve different braking requirements. However, the structure, position and connection relationship of the pressure regulating device in the above-mentioned patent document and the principle of the pressure regulating device are not very ideal, making it difficult for technical personnel in the field to set the pressure regulating device or use the pressure regulating device to form a new valve structure. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a pressure-regulating relay valve, including an outer shell, wherein the outer shell includes an upper shell and a lower shell that cooperate with each other, and a relay cavity is formed in the outer shell, and a relay piston that can reciprocate is arranged in the relay cavity, and the relay piston is divided into three sections, namely a pressure-applying section, a pressure-regulating section and a control section, a first pressure-regulating chamber is formed between the pressure-applying section, the pressure-regulating section and the relay cavity, a control chamber is formed around the control section, and an intake and exhaust structure that can be operated by the control section of the relay piston is arranged below the relay piston; and also includes a pressure-regulating structure, which connects the first pressure-regulating chamber and the control chamber respectively, and realizes pressure output in the control chamber through pressure changes in the control chamber and the first pressure-regulating chamber to realize different braking processes.

[0004] Further, the pressure regulating structure includes a second pressure regulating chamber provided on the lower shell, the second pressure regulating chamber is connected with the control chamber through a pressure regulating port, a valve seat is arranged in the second pressure regulating chamber, and a valve seat through hole is formed in the valve seat; a first spring and a valve matched with the first spring are arranged in the second pressure regulating chamber on the left side of the valve seat through hole, and the air flow can flow through the valve or the outside of the valve, and the valve can close the left side of the valve seat through hole under the action of air pressure; a sliding sealed pressure regulating piston is arranged in the second pressure regulating chamber on the right side of the valve seat through hole, a first air passing structure is formed between the left end of the pressure regulating piston and the valve seat, and the first air passing structure is connected with the valve seat through hole; a second air passing structure is also formed in the second pressure regulating chamber, and the second air passing structure is connected with the first air passing structure; an inclined hole is also included, and the two ends of the inclined hole are respectively connected with the first pressure regulating chamber and the second air passing structure; a second spring is also included, and the two ends of the second spring are respectively abutted with the pressure regulating piston and the end structure of the second pressure regulating chamber; as the air pressure in the first pressure regulating chamber changes, the pressure regulating piston slides left and right.

[0005] Furthermore, the center lines of the pressure regulating port, the first spring and the valve coincide with each other.

[0006] Furthermore, a resistance section is formed at one end of the pressure regulating piston, and the resistance section passes through the valve seat through hole and abuts against one end of the valve; at the same time, a third air passing structure is formed between the resistance section and the valve seat through hole, and the third air passing structure is connected to the first air passing structure.

[0007] Furthermore, the end structure of the second pressure-regulating chamber includes an adjusting seat connected to the second pressure-regulating chamber, and the adjusting seat is connected to an end cover; an adjusting inner cavity is formed in the adjusting seat, and a second spring seat is placed in the adjusting inner cavity, and the two ends of the second spring are respectively abutted against the pressure-regulating piston and the second spring seat; and an adjusting bolt is also included, and the adjusting bolt passes through the end cover and the adjusting seat and abuts against the second spring seat.

[0008] Furthermore, it also includes a tightening nut, which is adapted to the adjusting bolt.

[0009] Furthermore, it also includes a first spring positioning seat, the first spring is sleeved on the first spring positioning seat; and the first spring positioning seat forms a through hole, and its two ends are respectively connected to the control chamber and the second pressure regulating chamber.

[0010] Furthermore, the control chamber is formed with three control outlets.

[0011] Furthermore, the pressure applying section and the pressure regulating section are slidingly sealed with the relay cavity.

[0012] Furthermore, the air intake and exhaust structure includes a third spring seat arranged at the bottom of the relay cavity, a spring accommodating cavity is formed on the third spring seat, and the third spring is placed in the spring accommodating cavity; it also includes a sealing cover structure, the sealing cover structure cooperates with the third spring and the third spring seat, and a sealing surface is formed on the sealing cover structure; it also includes a pressure cover ring arranged on the side wall of the relay cavity, the pressure cover ring abuts against the sealing surface; an air storage cavity connected to the air inlet is formed around the third spring seat; an air outlet channel is formed in the third spring seat, which is connected to the air outlet arranged on the lower shell; the end of the control section cooperates with the sealing surface to realize the air intake and exhaust function.

[0013] Furthermore, the gland ring is fixed by a first retaining ring; the gland ring and the third spring base are sealed with the inner wall of the relay cavity by a sealing member.

[0014] The above technical solution of the present invention has the following advantages compared with the prior art:

[0015] (1) The pressure-regulating relay valve of the present invention divides the relay piston into three sections, and forms a first pressure-regulating chamber and a control chamber. A pressure-regulating structure is provided between the first pressure-regulating chamber and the control chamber. When the brake pedal is pressed, the air pressure of the main brake valve enters through the control inlet to push the relay piston to move. The pressure of the gas entering the control chamber and the first pressure-regulating chamber is changed by the pressure-regulating structure to realize the output of the pressure in the control chamber and realize the output of different brake pressures by the brake air chamber, so as to realize the function of light braking with light stepping and heavy braking with heavy stepping, thereby solving the problem of weak brakes of large and heavy trucks in the domestic market.

[0016] (2) In the pressure regulating relay valve of the present invention, the second pressure regulating chamber is arranged on the lower shell body, the structure is more reasonable and the optimization is more obvious; by arranging a valve seat in the second pressure regulating chamber, and the valve seat is formed with a valve seat through hole, a first spring, a valve and a pressure regulating piston, and a second spring are respectively arranged at the connecting end of the valve seat, and a first and a second air passing structure are formed at the same time, a part of the compressed gas entering the control chamber passes through the pressure regulating port, passes through or bypasses the valve, passes through the valve seat through hole, the first and the second air passing structures, and the inclined hole to enter the first pressure regulating chamber. As the pressure of the gas entering the control chamber changes, the The valve moves toward the valve seat through hole. At this time, the air pressure action area of ​​the control inlet is basically consistent with the air pressure action area of ​​the control outlet. When the pressure of the compressed gas continues to increase and reaches the set value, the valve closes the valve seat through hole. Further, as the pedal continues to be pressed, the pressure in the first pressure regulating chamber pushes the pressure regulating piston to slide in the opposite direction through the inclined hole, the second, and the first air passing structures, so that the pressure in the first pressure regulating chamber remains unchanged. At this time, the pressure in the control chamber continues to rise, so that the output ratio of the control inlet and the control outlet reaches an inflection point and gradually reaches the maximum, thereby achieving the effect of light braking with light stepping and heavy braking with heavy stepping.

[0017] (3) The pressure regulating relay valve of the present invention, further, the center lines of the pressure regulating port, the first spring and the valve coincide, and the structure of the coincidence of the center lines makes the valve react stably and quickly, thereby avoiding the occurrence of malfunctions; further, the pressure regulating piston has a travel resistance section, thereby making the combined structure of the first spring, the valve, the pressure regulating piston and the second spring more stable, smoother to use, and more effective and stable; further, the end structure of the second pressure regulating chamber forms an adjustment structure, which can adjust the pressure setting value as needed, thereby facilitating the inspection and adjustment of the brakes during vehicle operation; further, by providing a first spring positioning seat, the first spring is stably positioned in the structural combination without deviation, thereby effectively ensuring the stability of pressure regulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the following briefly introduces the drawings required for use in the specific implementation modes. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 It is a structural schematic diagram of the pressure regulating relay valve of the present invention;

[0020] Figure 2 The schematic diagram of the structure of the pressure regulating relay valve of the present invention is Figure 1 ;

[0021] Figure 3 The schematic diagram of the structure of the pressure regulating relay valve of the present invention is Figure 2 ;

[0022] Figure 4 The compressed gas flow diagram of the pressure regulating relay valve of the present invention is shown in FIG. Figure 1 ;

[0023] Figure 5 The compressed gas flow diagram of the pressure regulating relay valve of the present invention is shown in FIG. Figure 2 ;

[0024] Figure 6 The compressed gas flow diagram of the pressure regulating relay valve of the present invention is shown in FIG. Figure 3 ;

[0025] The reference numerals in the figure are as follows: 1-upper shell; 2-lower shell; 3-relay cavity; 4-pressure section; 5-pressure regulating section; 6-control section; 7-first pressure regulating chamber; 8-control chamber; 9-second pressure regulating chamber; 10-pressure regulating port; 11-valve seat; 12-valve seat through hole; 13-first spring; 14-valve; 15-pressure regulating piston; 16-first air passing structure; 17-second air passing structure; 18-inclined hole; 19-second spring; 20-contact section; 21-third air passing structure; 22-adjusting seat; 23-end cover; 24-adjusting inner cavity; 25-second Spring seat; 26-adjusting bolt; 27-tightening nut; 28-first spring positioning seat; 29-through hole; 30-control outlet; 31-control inlet; 32-third spring seat; 33-spring accommodating chamber; 34-sealing cover structure; 35-sealing surface; 36-pressure cover ring; 37-air inlet; 38-air outlet channel; 39-air outlet; 40-first sealing ring; 41-second sealing ring; 42-first retaining ring; 43-third sealing ring; 44-second retaining ring; 45-fourth sealing ring; 46-fifth sealing ring; 47-third spring; 48-air storage chamber. DETAILED DESCRIPTION

[0026] The following is a clear and complete description of the content of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The embodiments in the present invention and other embodiments obtained by ordinary technicians in this field without creative work are all within the scope of protection of the present invention.

[0027] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0028] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0029] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0030] Example 1

[0031] The present embodiment discloses a pressure-regulating relay valve, comprising an outer shell, wherein the outer shell comprises an upper shell body 1 and a lower shell body 2 which cooperate with each other, and a relay cavity 3 is formed in the outer shell, a relay piston capable of reciprocating movement is arranged in the relay cavity 3, and the relay piston is divided into three sections, namely a pressure-applying section 4, a pressure-regulating section 5 and a control section 6, a first pressure-regulating chamber 7 is formed between the pressure-applying section 4, the pressure-regulating section 5 and the relay cavity 3, a control chamber 8 is formed around the control section 6, and an air intake and exhaust structure which can be operated by the control section 6 of the relay piston is arranged below the relay piston; the pressure-regulating structure also comprises a pressure-regulating structure, wherein the pressure-regulating structure is connected to the first pressure-regulating chamber 7 and the control chamber 8 respectively, and the pressure output in the control chamber 8 is realized by the pressure changes in the control chamber 8 and the first pressure-regulating chamber 7 to realize different braking processes.

[0032] The above technical scheme is the core technical scheme of the present invention. In this technical scheme, the relay piston is divided into three sections, and a first pressure regulating chamber 7 and a control chamber 8 are formed. A pressure regulating structure is arranged between the first pressure regulating chamber 7 and the control chamber 8. When the brake pedal is pressed, the air pressure of the main brake valve enters through the control inlet 31 to push the relay piston to move. The pressure of the gas entering the control chamber 8 and the first pressure regulating chamber 7 is changed by the pressure regulating structure to realize the output of the pressure in the control chamber 8, and realize the output of different braking pressures of the brake air chamber, so as to realize the function of light braking with light stepping and heavy braking with heavy stepping, and solve the problem of weak brakes of large and heavy trucks in the domestic market.

[0033] Specifically, Figure 1-3As shown, in this embodiment, the upper shell 1 and the lower shell 2 that cooperate with each other adopt the cooperation structure in the prior art, and the sealing between the two is achieved by a seal, preferably a sealing ring; a relay cavity 3 is formed in the shell, and the structural shape of the relay cavity 3 is not specifically limited. It is set according to the structure of the components arranged therein, and a control inlet 31 is formed on the upper shell 1. The control inlet 31 is connected to the relay cavity 3 and the brake master valve respectively. When the driver steps on the pedal of the brake master valve, the air pressure of the brake master valve enters the relay cavity 3 through the control inlet 31 to drive the relay piston to slide in the relay cavity 3. The relay piston slides and seals on the wall of the relay cavity 3 under the action of external force. It is divided into three sections, and the three sections are connected together, namely the pressure section 4, the pressure regulating section 5 and the control section 6. The three can be integrally formed or connected by connection methods such as welding. The shapes of the three are not specifically limited. In this embodiment, the commonly used shapes of pistons, cylindrical, are selected respectively. Of course, in order to achieve certain purposes and effects, such as reducing weight or installing seals, cavities or grooves or chamfered structures can be formed. The above-mentioned structure for realizing sliding sealing is that a seal is arranged between the pressure section 4 and the pressure regulating section 5 and the wall of the relay cavity 3, such as a first sealing ring 40 and a second sealing ring 41. As for how the seal is fixedly installed, this is common in the art, such as through a groove, and the seal is installed in the groove. As for the size requirements of the pressure-applying section 4, the pressure-regulating section 5 and the control section 6, no specific restrictions are imposed. In the present embodiment, the cross section of the pressure-applying section 4 is larger than the cross section of the pressure-regulating section 5, and the cross section of the pressure-regulating section 5 is larger than the cross section of the control section 6, that is, the structure is from large to small from top to bottom, wherein the control section 6 is located in the relay cavity and does not contact the wall of the relay cavity; a first pressure-regulating chamber 7 is formed between the pressure-applying section 4, the pressure-regulating section 5 and the relay cavity 3, specifically, the lower end face of the pressure-applying section 4, the side wall of the pressure-regulating section 5 and the wall of the relay cavity 3 form the first pressure-regulating chamber 7, and when the relay piston slides downward, the volume of the first pressure-regulating chamber 7 becomes smaller; a control chamber 8 is formed around the control section 6, and at An intake and exhaust structure that can be operated by the control section 6 of the relay piston is arranged below the relay piston. Specifically, the side wall of the control section 6, the lower end surface of the pressure regulating section, the wall of the relay cavity 3 and the intake and exhaust structure surround the control cavity 8; it also includes a pressure regulating structure, and the pressure regulating structure is connected to the first pressure regulating cavity 7 and the control cavity 8 respectively. The pressure output in the control cavity 8 is realized by the pressure change in the control cavity 8 and the first pressure regulating cavity 7 during the sliding process of the relay piston to realize different braking processes. The output is pressure-outputted through the control outlet 30 formed on the control cavity 8. The number of the control outlets 30 can be set to multiple, such as 3, which can be used for a variety of heavy vehicles such as tractors, and has strong versatility.

[0034] As for the pressure regulating structure, in the present embodiment, it comprises a second pressure regulating chamber 9 arranged on the lower shell 2. The structure of the second pressure regulating chamber 9 is set according to the structure of the components arranged therein. The second pressure regulating chamber 9 is connected with the control chamber 8 through the pressure regulating port 10. A valve seat 11 is arranged in the second pressure regulating chamber 9. The shape of the valve seat 11 is not specifically limited. A valve seat through hole 12 is formed therein. The shape of the valve seat through hole 12 is not specifically limited, such as a cylindrical hole or a combination of several types, specifically, a combination of a cylindrical hole and a trumpet hole. In order to ensure that the air pressure does not penetrate from the periphery of the valve seat 11 during transmission, a sealing member, such as a fifth sealing ring 46, is arranged between the valve seat 11 and the wall of the second pressure regulating chamber. As for how the seal is fixedly installed, this is common in the art, such as through a groove body, in which the seal is installed. There are many ways to install the valve seat 11 in the second pressure regulating chamber 9. In the present embodiment, a second retaining ring 44 and a groove adapted to the second retaining ring 44 are provided to install the valve seat 11; a first spring 13 and a valve 14 cooperating with the first spring 13 are arranged in the second pressure regulating chamber 9 on the left side of the valve seat through hole 12, and the air flow can flow through the valve 14 or the outside of the valve 14, and the valve 14 can close the left side of the valve seat through hole 12 under the action of air pressure. Preferably, the first spring 13 is sleeved on the first spring positioning seat 28, and the first spring positioning seat The first spring 13 is provided with a through hole 29, and the two ends of the through hole 12 are connected to the control chamber 8 and the second pressure regulating chamber 9 respectively. The shape of the first spring positioning seat 28 is not specifically limited. In the present embodiment, it is a frustum. The valve 14 is selected to have a rubber or silicone structure with a skeleton. Preferably, its outer contour is similar to the wall structure of the second pressure regulating chamber 9 at this location, and there is a ventilation gap between the two. Preferably, the two ends of the first spring 13 are connected to the first spring positioning seat 28 and the valve 14. A sliding sealed pressure regulating piston 15 is arranged in the second pressure regulating chamber 9 on the right side of the valve seat through hole 12. The structure of the pressure regulating piston 15 is not specifically limited. Generally, a cylindrical structure is selected, such as a cylindrical structure. Of course, in order to implement A groove or cavity is formed on the pressure regulating piston 15, and the sealing structure is an existing sliding sealing structure, such as a seal between the pressure regulating piston 15 and the wall of the second pressure regulating chamber 9, such as a fourth sealing ring 45. As for how the seal is fixedly installed, this is common in the art, such as through a groove, and the seal is installed in the groove; a first air passing structure 16 is formed between the left end of the pressure regulating piston 15 and the valve seat 11, and the first air passing structure 16 is not specifically limited and can be set up separately. In this embodiment, it is the space between the pressure regulating piston 15 and the valve seat 11 except for the second retaining ring 44, so that the space between the components is effectively utilized and the structure is simple;A second gas-permeable structure 17 is also formed in the second pressure-regulating chamber 9, and the second gas-permeable structure 17 is connected to the first gas-permeable structure 16. The structure of the second gas-permeable structure 17 is not specifically limited. In the present embodiment, it is a groove on the wall of the second pressure-regulating chamber 9; an inclined hole 18 is also formed, and the two ends of the inclined hole 18 are respectively connected to the first pressure-regulating chamber 7 and the second gas-permeable structure 17; a second spring 19 is also formed, and the two ends of the second spring 19 are respectively abutted against the pressure-regulating piston 15 and the end structure of the second pressure-regulating chamber 9. Preferably, the pressure-regulating piston 15 is provided with a second spring fixing hole, and the second spring can be placed therein; as the air pressure in the first pressure-regulating chamber 7 changes, the pressure-regulating piston 15 slides left and right. In order to realize the sliding of the pressure-regulating piston 15 under the change of air pressure, a sealing member is arranged on the right side of the inclined hole 18, the first gas-permeable structure 16, and the second gas-permeable structure 17. ;

[0035] As a deformation mode, a resistance section 20 is formed at one end of the pressure regulating piston 15. The resistance section 20 is in the shape of an elongated strip, and its structure is not specifically limited, preferably cylindrical. It passes through the valve seat through hole 12 and abuts against one end of the valve 14. During normal driving of the vehicle, there is a certain distance between the valve and the valve seat, or the valve is partially pushed out by the resistance section. At this time, the first spring 13 and the first spring locating seat 28 and the valve can be sleeved; at the same time, a third air-transmitting structure 21 is formed between the resistance section 20 and the valve seat 11. At this time, the third air-transmitting structure 21 is the space between the resistance section 20 and the valve seat 11, or the remaining space of the valve seat through hole 12 after the resistance section 20 passes through the valve seat through hole 12; the third air-transmitting structure 21 is connected to the first air-transmitting structure 16.

[0036] As another deformation mode, in order to facilitate the adjustment of pressure changes or braking effects, the end structure of the second pressure regulating chamber 9 includes an adjustment seat 22 connected to the wall of the second pressure regulating chamber 9. The connection method is various. In the present embodiment, the two are connected by a thread. The adjustment seat 22 is connected with an end cover 23. The connection method is various. In the present embodiment, the two are connected by a thread. An adjustment inner cavity 24 is formed in the adjustment seat 22, and a second spring seat 25 is placed in the adjustment inner cavity 24. One end of the second spring 19 is sleeved on the second spring seat 25. Further, it also includes an adjustment bolt 26. The adjustment bolt 26 passes through the end cover 23 and the adjustment seat 22 and abuts against the second spring seat 25. By turning the adjustment bolt 26, the compression degree of the spring can be adjusted to adjust the air pressure change. Further, it also includes a tightening nut 27. The tightening nut 27 is adapted to the adjusting bolt 26 to reduce the loosening of the adjusting bolt 26.

[0037] As for the intake and exhaust structure, its structure is not specifically limited, and the structure of the existing relay valve for realizing the intake and exhaust function can also be adopted. In the present embodiment, the intake and exhaust structure includes a third spring seat 32 arranged at the bottom of the relay cavity 3, and a spring accommodating cavity 33 is formed on the third spring seat 32, and a third spring 47 is placed therein, and also includes a sealing cover structure 34, and the sealing cover structure 34 cooperates with the third spring 47 and the third spring seat 32, and a sealing surface 35 is formed on the sealing cover structure 34, wherein the third spring 32 can be made of plastic, and the sealing cover structure 34 is a soft material such as rubber or silicone containing a firmware, and its structure can be selected from the structure in the prior art, which will not be elaborated here; it also includes a gland ring 36 arranged on the side wall of the relay cavity, and the gland ring 36 abuts against the sealing surface 34, and the structure of the gland ring 36 is not specifically limited, and is preferably annular. Of course, its cross-section The surface can be a square, rectangular, L-shaped, Z-shaped structure, etc., and its arrangement is varied. It is fixed by a combination of a first retaining ring 42 arranged thereon and a slot structure in which the first retaining ring 42 is placed. At the same time, it is sealed around by a third sealing ring 43; an air storage chamber 48 connected to the air inlet 37 is formed around the third spring seat 32, wherein the number of the air inlet 37 is not limited. In this embodiment, two are preferred, which can accelerate the braking response during braking. The air inlet 37 is connected to the air reservoir; an air outlet channel 38 is formed in the third spring seat 32, which is connected to the air outlet 39 arranged on the lower shell 2. The air outlet channel 38 is the hollow part of the hollow third spring seat 32. In order to maintain rigidity and prevent deformation, a strip-shaped body uniformly arranged in the circumferential direction is formed on the inner wall. The strip-shaped body structure is not specifically limited and can be arranged according to the specific structure of the hollow part; the end of the control section 6 cooperates with the sealing surface 35 to realize the air intake and exhaust function

[0038] Furthermore, the center lines of the pressure regulating port 10 , the through hole 29 , the first spring 13 and the valve 14 coincide with each other.

[0039] Preferably, in order to achieve better sealing effects between the gland ring 36 and the sealing surface 35, between the end of the control section 6 and the sealing surface 35, and between the valve 14 and the valve seat 11, the structure of the sealing contact between the gland ring 36, the end of the control section 6 and the valve seat 11 is that the interface is an acute angle or an acute angle with a rounded chamfer.

[0040] like Figure 4-6 As shown, the use process of the present invention is as follows, wherein the blackened parts are the positions of the compressed gas at different stages, as follows:

[0041] like Figure 4As shown, when the vehicle is running normally, the air inlet 37 of the lower body 2 is connected to the air cylinder. At this time, the sealing cover mechanism 34 is fitted with the pressure cover ring 36 under the action of the third spring 32 and the air pressure of the air inlet 37. At this time, the compressed gas is located in the air storage chamber 48. At the same time, the end of the control section 6 is not in contact with the sealing surface 35, and the air outlet channel 38 and the air outlet 39 are in an open state. At this time, the air pressure in the air storage chamber 48 is always kept connected to the air cylinder.

[0042] like Figure 5 As shown, when the driver steps on the pedal of the brake master valve, the air pressure of the brake master valve enters through the control inlet 31 of the upper shell 1, pushing the relay piston downward, causing the sealing cover mechanism 34 to leave the gland ring 36 and fit with the end of the control section 6 of the relay piston. At this time, the air outlet channel 38 is in a closed state, the sealing cover mechanism 34 and the gland ring 36 are in an open state, and the air storage chamber 48 is connected to the control chamber 8. The air pressure from the air storage chamber 48 enters the control chamber 8 and then reaches the brake air chamber through the control outlet 30, thereby achieving a rapid braking effect; at the same time, when the control outlet 30 has an output, the air pressure in the control chamber 8 enters the second pressure regulating chamber 9 through the pressure regulating port 10. In the second pressure regulating chamber 9, the air pressure passes through the first spring 13, bypasses or passes through the valve 14, and enters the first pressure regulating chamber 7 through the third air passing structure 21, the first air passing structure 16, the second air passing structure 17, and the inclined hole 18 to act on the bottom of the piston 3 (that is, the area difference between S2 and S1), plus the upward force of the compressed air in the control chamber 8 on the relay piston (the sum of the two is basically the area of ​​S1), so that the control port air pressure action area is basically consistent with the output port air pressure action area. When the air pressure outputted from the control outlet 30 gradually increases so that the left side of the second pressure regulating chamber 9 reaches or exceeds the pressure regulating value (which can be set as required, for example: 200 KPa for illustration of the principle), under the action of the first spring 13 and the second spring 19, the valve 14 fits with the end of the valve seat 11, as shown in FIG. Figure 6 As shown, the third air passing structure 21 is closed, and the air pressure output by the control outlet 30 stops supplying air to the first pressure regulating chamber 9; as the driver continues to step on the pedal, the pressure of the control inlet 31 continues to rise, and the pressure of the first pressure regulating chamber 9 has exceeded the original pressure regulating value, and the third air passing structure 21 is in a closed state; the air pressure of the first pressure regulating chamber 9 no longer rises, the air pressure of the control inlet 31 continues to rise, and the control outlet 30 control chamber 8 only has the upward force in the control chamber and the pressure regulating value 200kPa. At this time, the area of ​​the relay piston S1 and the area of ​​S2 begin to form a pressure difference, and the output ratio of the relay valve control inlet 31 and the control outlet 30 begins to form an inflection point and gradually reaches the maximum (due to the effect of the area difference, the maximum output ratio of the relay valve is 1:2.5), thereby achieving the effect of light braking with light stepping and heavy braking with heavy stepping.

[0043] When the driver lifts the pedal, the pressure of the control inlet 31 decreases. Under the action of the third spring 47 and the pressure of the control chamber 8, the relay piston moves upward, and the gland ring 36 re-fits with the sealing surface 35 of the sealing cover structure 34. At this time, the air intake path is closed. At the same time, the end of the control section leaves the sealing surface 35, the air outlet channel 38 is opened, and the air pressure of the brake air chamber is discharged from the air outlet 39 through the control chamber 8 and the air outlet channel 38. At the same time, the pressure regulating piston 15 moves to the left under the action of the second spring 19, the valve 14 leaves the valve seat 11, opens the third air passing structure 21, and the pressure of the first pressure regulating chamber 7 is discharged from the air outlet 39 along the original path. At this time, the relay valve state returns to the normal state.

[0044] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A pressure regulating relay valve, comprising a housing, the housing comprising an upper housing and a lower housing that cooperate with each other, and a relay cavity is formed in the housing, characterized in that: A relay piston capable of reciprocating motion is arranged in the relay cavity, and the relay piston is divided into three sections, namely, a pressure-applying section, a pressure-regulating section and a control section. A first pressure-regulating chamber is formed between the pressure-applying section, the pressure-regulating section and the relay cavity, and a control chamber is formed around the control section. An air intake and exhaust structure operable by the control section of the relay piston is arranged below the relay piston; and a pressure-regulating structure is also included, which is connected to the first pressure-regulating chamber and the control chamber respectively, and the pressure output in the control chamber is realized by the pressure changes in the control chamber and the first pressure-regulating chamber to realize different braking processes; The pressure regulating structure includes a second pressure regulating chamber provided on the lower shell body, the second pressure regulating chamber being connected with the control chamber through a pressure regulating port, a valve seat being arranged in the second pressure regulating chamber, and a valve seat through hole being formed in the valve seat; a first spring and a valve cooperating with the first spring are arranged in the second pressure regulating chamber on the left side of the valve seat through hole, and air flow can flow through the valve or the outside of the valve, and the valve can close the left side of the valve seat through hole under the action of air pressure; a sliding sealed pressure regulating piston is arranged in the second pressure regulating chamber on the right side of the valve seat through hole, a first air passing structure is formed between the left end of the pressure regulating piston and the valve seat, and the first air passing structure is connected with the valve seat through hole; a second air passing structure is also formed in the second pressure regulating chamber, and the second air passing structure is connected with the first air passing structure The air structure is connected; it also includes an inclined hole, the two ends of which are connected to the first pressure regulating chamber and the second air passing structure respectively; it also includes a second spring, the two ends of which are respectively abutted against the end structures of the pressure regulating piston and the second pressure regulating chamber; as the air pressure in the first pressure regulating chamber changes, the pressure regulating piston slides left and right; the cross-sectional area S1 of the pressure section is greater than the cross-sectional area S2 of the pressure regulating section; the air pressure at the control inlet acts on the side surface of the relay piston away from the pressure section, the pressure regulating section and the control section, and the effective area is S1; the air pressure at the air inlet acts on the side of the relay piston that is in the same direction as the pressure section, the pressure regulating section and the control section; as the air pressure in the control chamber increases, the pressure regulating structure closes the connection between the control chamber and the first pressure regulating chamber, the air pressure at the air inlet no longer acts on the first pressure regulating chamber, and the area of ​​the air pressure at the air inlet acting on the relay piston is reduced from S1 to S2.

2. The pressure regulating relay valve according to claim 1, characterized in that: A resistance section is formed at one end of the pressure regulating piston, and the resistance section passes through the valve seat through hole and abuts against one end of the valve; at the same time, a third air passing structure is formed between the resistance section and the valve seat through hole, and the third air passing structure is connected to the first air passing structure.

3. The pressure regulating relay valve according to claim 2, characterized in that: The end structure of the second pressure-regulating chamber includes an adjusting seat connected to the second pressure-regulating chamber, and the adjusting seat is connected to an end cover; an adjusting inner cavity is formed in the adjusting seat, and a second spring seat is placed in the adjusting inner cavity, and the two ends of the second spring are respectively abutted against the pressure-regulating piston and the second spring seat; and an adjusting bolt is also included, and the adjusting bolt passes through the end cover and the adjusting seat and abuts against the second spring seat.

4. The pressure regulating relay valve according to claim 3, characterized in that: It also includes a tightening nut, which is matched with the adjusting bolt.

5. The pressure regulating relay valve according to claim 4, characterized in that: It also includes a first spring positioning seat, the first spring is sleeved on the first spring positioning seat; and the first spring positioning seat forms a through hole, and its two ends are respectively connected to the control chamber and the second pressure regulating chamber.

6. The pressure regulating relay valve according to claim 5, characterized in that: The center lines of the pressure regulating port, the through hole, the first spring and the valve coincide with each other.

7. The pressure regulating relay valve according to claim 6, characterized in that: The control chamber is formed with three control outlets.

8. The pressure regulating relay valve according to claim 1, characterized in that: The pressure applying section and the pressure regulating section are slidably sealed with the relay cavity.

9. The pressure regulating relay valve according to claim 1, characterized in that: The intake and exhaust structure includes a third spring seat arranged at the bottom of the relay cavity, a spring accommodating cavity is formed on the third spring seat, and a third spring is placed in the spring accommodating cavity; further includes a sealing cover structure, the sealing cover structure cooperates with the third spring and the third spring seat, and a sealing surface is formed on the sealing cover structure; further includes a gland ring arranged on the side wall of the relay cavity, the gland ring abuts against the sealing surface; An air storage cavity connected to the air inlet is formed around the third spring seat; an air outlet channel is formed in the third spring seat and is connected to the air outlet arranged on the lower shell; the end of the control section cooperates with the sealing surface to realize the air intake and exhaust functions.

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