A large flow adjustable double-Echizen proportional relay valve

Abstract

This invention discloses a large-flow adjustable dual-overshoot proportional relay valve. By redesigning the piston structure, an overshoot chamber structure is re-formed. In particular, the area of ​​the gas in the overshoot chamber exerting a reverse force on the piston, especially the piston pressure plate, is reduced. Structurally, the starting edge of the overshoot chamber changes from the inner wall of the piston to a first annular structure that shifts radially towards the axis, thereby increasing the overshoot output ratio, resulting in faster braking response, reduced braking reaction time, and improved braking speed based on light pressing and light braking.

Description

Technical Field

[0001] The invention relates to the technical field of automobile parts, and in particular to a large-flow adjustable double-Echizen proportional relay valve. Background Art

[0002] The relay valve is a part of the automobile air brake system, and its air inlet is connected to the air reservoir, and the air outlet is connected to the brake air chamber. When the 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 that the compressed air enters the brake air chamber directly from the air reservoir through the air inlet without flowing through the brake valve, which greatly shortens the inflation pipeline of the brake air chamber and accelerates the restart process of the air chamber. For example, Chinese document CN102481919A discloses a relay valve device, and for another example, Chinese patent document CN207510415U discloses an emergency brake valve with a pressure regulating function. The emergency brake 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 patent document and the principle of the pressure regulating device are not very ideal, which makes it difficult for technicians in this field to set the pressure regulating device or use the pressure regulating device to form a new valve structure. In order to solve this technical problem, the technical personnel of our company have developed a pressure-regulating relay valve, as shown in Chinese patent document CN212500322U for details. The valve comprises an outer shell, the outer shell comprises an upper shell and a lower shell that cooperate with each other, and a relay cavity is formed in the outer shell, a relay piston capable of reciprocating movement is arranged in the relay cavity, 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; the valve also comprises a pressure-regulating structure, the pressure-regulating structure 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 above patent document achieves the braking effect of light braking with light stepping and heavy braking with heavy stepping by setting a three-stage piston and a pressure regulating structure. However, in actual application, it is found that the braking force when lightly stepping on the brake is not very good, especially when braking for engineering vehicles, so it is necessary to further improve the force sensitivity of the relay valve when lightly stepping on the brake. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides a large-flow adjustable double-Yueqian proportional relay valve, including a shell, the shell includes an upper shell and a lower shell that are sealed and connected; and a piston cavity is formed in the shell, a piston that can reciprocate is arranged in the piston cavity, and the piston includes a piston pressure plate, and the peripheral edge of the piston pressure plate or above the peripheral edge or below the peripheral edge is slidably sealed with the side wall of the piston cavity; a first annular structure and a second annular structure are formed below the piston pressure plate, the first annular structure and the second annular structure are arranged radially, and the first annular structure and the piston cavity are There is a certain interval between the side walls, and the side walls of the interval are provided with a breathing structure; the first annular structure, the second annular structure and the third annular structure formed by the shell in the piston cavity are slidingly sealed, and a Yueqian cavity is formed between the three; a valve section is also formed under the piston pressure plate, and a control cavity is formed around the valve section, and an intake and exhaust structure controlled by the valve section is arranged under the valve section; it also includes a pressure regulating unit, and the pressure regulating unit is connected to the Yueqian cavity and the control cavity respectively, and the pressure output of the control cavity is realized through the pressure changes in the Yueqian cavity and the control cavity to achieve different braking.

[0004] Furthermore, a column section that is slidably sealed with the valve section is formed on the upper shell, and the column section is arranged through the valve section.

[0005] Furthermore, a limiting groove matching with the first annular structure is formed on the lower shell.

[0006] Furthermore, the pressure regulating unit includes a pressure regulating chamber arranged on the lower shell, a pressure regulating valve seat sealed with the pressure regulating chamber wall is arranged in the pressure regulating chamber, the pressure regulating chamber is separated into a first pressure regulating chamber and a second pressure regulating chamber by the pressure regulating valve seat, the two are connected through a valve seat through hole arranged on the pressure regulating valve seat, and the first pressure regulating chamber is connected with the control chamber through a pressure regulating channel; a first spring and a pressure regulating valve cooperating with the first spring are arranged in the first pressure regulating chamber, and the airflow flows through the pressure regulating valve or the outside of the pressure regulating valve; a pressure regulating piston with a sliding seal is arranged in the second pressure regulating chamber. , 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 the pressure-regulating valve, and a first channel is formed between the resistance section and the side wall of the valve seat through hole; a second channel is formed between the pressure-regulating piston and the pressure-regulating valve seat, and the two ends of the first channel are respectively connected with the first pressure-regulating chamber and the second channel; the second channel is also connected with the Echizen chamber through a third channel; and a second spring is also included, and the two ends of the second spring abut against the end structures of the pressure-regulating piston and the second pressure-regulating chamber respectively; as the pressure in the control chamber changes, the pressure-regulating piston slides.

[0007] Furthermore, the end structure of the second pressure regulating chamber includes a spring cap connected to the side wall of the second pressure regulating chamber, a first spring seat is arranged in the spring cap, and two ends of the second spring are respectively abutted against the pressure regulating piston and the first spring seat; and also includes an adjusting bolt, which passes through the spring cap and abuts against the first spring seat.

[0008] Furthermore, it also includes a tightening nut, which cooperates with the adjusting bolt.

[0009] Furthermore, it also includes a dust cover, which is arranged on the spring cap, and the adjusting bolt passes through the dust cover and the spring cap and abuts against the first spring seat.

[0010] Furthermore, a spring positioning seat is provided in the first pressure regulating chamber, the first spring is sleeved on the spring positioning seat, and the spring positioning seat is further formed with a through hole, both ends of which are respectively connected with the control chamber and the first pressure regulating chamber.

[0011] Furthermore, one control inlet and four control outlets are formed on the shell.

[0012] Furthermore, the air intake and exhaust structure includes a second spring seat arranged at the bottom of the piston cavity, and a third spring cavity for placing a third spring is formed on the second spring seat; 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 sealed with the side wall of the piston cavity, and 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, and the air outlet is connected to the muffler assembly arranged on the shell; the end of the valve section cooperates with the sealing surface to realize the air intake and exhaust function.

[0013] Furthermore, there are two air inlets.

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

[0015] (1) The large flow adjustable dual Echizen proportional relay valve of the present invention re-forms the Echizen chamber structure by redesigning the piston structure, especially the reverse force area of ​​the gas in the Echizen chamber on the piston, especially the piston pressure plate, becomes smaller. Structurally, the starting edge of the Echizen chamber changes from the inner wall of the piston to the first annular structure that moves radially toward the axis, so that the Echizen output ratio becomes larger, thereby making the braking response faster, reducing the braking reaction time, and improving the braking rate on the basis of light stepping and light braking.

[0016] (2) In the large flow adjustable dual Echizen proportional relay valve of the present invention, there is a certain interval between the first annular structure and the side wall of the piston cavity, which can reduce the weight of the relay valve or the piston and achieve lightweight components or valves; the side wall of the interval is provided with a breathing structure to ensure that there is no pressure change in the interval range, avoid unnecessary resistance to the piston movement, and promote stable sliding of the piston.

[0017] (3) The large flow adjustable dual-front proportional relay valve of the present invention forms a column section that is slidably sealed with the valve section, so that the piston can operate more stably when sliding, and the driver's braking comfort is enhanced; at the same time, the three-section piston design in the prior art is changed to only design the valve section, which can shorten the height of the piston, making the overall structure of the relay valve compact and the volume smaller. 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 a large flow adjustable double-Echizen proportional relay valve of the present invention;

[0020] Figure 2 It is a schematic diagram of the overall structure of the large flow adjustable double-Echizen proportional relay valve of the present invention;

[0021] Figure 3 It is a schematic structural diagram of another direction of the large flow adjustable double Echizen proportional relay valve of the present invention;

[0022] Figure 4 It is the output curve of the large flow adjustable double Echizen proportional relay valve of the present invention;

[0023] The reference numerals in the figure are as follows: 1-upper shell; 2-lower shell; 3-piston cavity; 4-piston pressure plate; 5-first annular structure; 6-second annular structure; 7-third annular structure; 8-echizen cavity; 9-valve section; 10-control cavity; 11-column section; 12-pressure regulating valve seat; 13-first pressure regulating cavity; 14-second pressure regulating cavity; 15-valve seat through hole; 16-pressure regulating channel; 17-first spring; 18-pressure regulating valve; 19-pressure regulating piston; 20-contact section; 21-first channel; 22-second channel; 23-third channel; 24-second spring; 25-spring cap; 26-first spring seat; 27-adjusting bolt; 28-tightening nut; 29-anti- Dust cover; 30-spring positioning seat; 31-control inlet; 32-control outlet; 33-second spring seat; 34-third spring; 35-third spring chamber; 36-sealing cover structure; 37-pressure cover ring; 38-air inlet; 39-air storage chamber; 40-air outlet channel; 41-muffler assembly, 42-first sealing ring; 43-second sealing ring; 44-third sealing ring; 45-fourth sealing ring; 46-fifth sealing ring; 47-sixth sealing ring; 48-seventh sealing ring; 49-eighth sealing ring; 50-ninth sealing ring; 51-mounting bolt; 52-first retaining ring; 53-second retaining ring; 54-air outlet; 55-interval; 56-limiting groove; 57-stealing groove. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] Example 1

[0028] like Figure 1-3 As shown, this embodiment discloses a large flow adjustable double-Echizen proportional relay valve, wherein: Figure 1This is a cross-sectional view of the relay valve. It is not obtained by a single cross-sectional view, but by combining three cross-sectional views. It is roughly divided into three parts: E, F and G. E is the pressure regulating unit part, F and G are the main parts of the relay valve, and Figure 2 The dotted line divides the section into two parts.

[0029] The large flow adjustable dual-front proportional relay valve disclosed in this embodiment includes a shell, and the shell includes an upper shell 1 and a lower shell 2 that are sealed and connected. The sealed connection is achieved by an eighth sealing ring 49. As for the installation of the eighth sealing ring 49, it can be achieved by using a mounting groove; after the upper shell 1 and the lower shell 2 are combined, a piston cavity 3 is formed, and a reciprocating piston and other components that cooperate with the piston are arranged in the piston cavity 3; a control inlet 31 is formed on the upper shell 1, and the control inlet 31 is connected to the piston 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 flows through the control inlet 31 into the piston cavity 3 to drive The piston slides in the piston cavity 3; the piston includes a piston pressure plate 4, and the peripheral edge of the piston pressure plate 4 or above the peripheral edge or below the peripheral edge is slidably sealed with the side of the piston cavity 3, and the sliding seal is realized in the form of a sealing ring and a sealing groove matched therewith. As for the setting position of the sealing groove, it can be directly set at the peripheral edge of the piston pressure plate 4 or above the peripheral edge or below the peripheral edge. In this embodiment, a sealing groove structure is formed under the peripheral edge of the piston pressure plate to place a first sealing ring 42; a first annular structure 5 and a second annular structure 6 are also formed under the piston pressure plate 4, and the first annular structure 5 and the second annular structure 6 are arranged radially, wherein the first annular structure can also be formed below the sealing groove where the first sealing ring 42 is placed; there is a certain interval 55 between the first annular structure 5 and the side wall of the piston cavity 3, or a certain cavity structure is formed between the first annular structure 5 and the side wall of the piston cavity 3, the structure of the interval 55 is not specifically limited, and a breathing structure is provided on its side wall, and the choice of the breathing structure is varied, and can be independent, such as a vent hole or a vent gap, etc., or can be connected to other venting structures of the relay valve; the first annular structure 5 and the second annular structure 6 form a space 55 with the shell in the piston cavity 3 The third annular structure 7 is inserted between the first annular structure 5 and the second annular structure 6. As for the sliding seal, it can be realized in the form of a sealing ring and a sealing groove. In the present embodiment, it is realized by a second sealing ring 43 and a third sealing ring 44 and a sealing groove matched therewith. A valve section 9 is also formed below the piston pressure plate 4. A control cavity 10 is formed around the valve section 9. An intake and exhaust structure controlled by the valve section 9 is arranged below the valve section 9. Specifically, the side wall of the control section 9, the side wall of the valve section 10, the wall of the piston cavity 3 and the intake and exhaust structure enclose the control cavity 10.It also includes a pressure regulating unit, which is connected to the Echizen chamber 8 and the control chamber 10 respectively, and realizes the pressure output in the control chamber 10 to achieve different braking through the pressure change in the Echizen chamber 8 and the control chamber 10 during the sliding process of the piston. The output is output through the control outlet 32 ​​connected to the control chamber 10. The number of the control outlets 32 can be set to multiple, such as 4. Setting 4 control outlets 32 can achieve a large flow output. ;

[0030] In order to limit the operation of the piston, a limiting groove 56 matching the first annular structure 5 is formed on the lower shell 2. The structure of the limiting groove 56 is not specifically limited, and is preferably an annular groove with various cross-sectional shapes, preferably adapted to the lower end of the first annular structure 5.

[0031] Furthermore, a column section 11 is formed on the upper shell 1 to be slidably sealed with the valve section 9. The column section 11 is arranged through the valve section 10. As for the sliding seal, it can be realized in the form of a sealing ring and a sealing groove. In this embodiment, it is realized by a ninth sealing ring 50. As for the structure matching with the ninth sealing ring 50, specifically, the end section of the column section 11 forms a T-shape, and correspondingly, the valve section 9 forms an annular step, and the ninth sealing ring 50 is placed between the annular step and the T-shaped structure. This structure can realize the function of the piston guide, and can make the piston run more smoothly and stably without getting stuck, reduce the instantaneous eccentricity caused by the input of the air pressure flow, and make the braking process more comfortable; at the same time, it reduces the downward action area of ​​the piston, in order to facilitate the output ratio setting.

[0032] As for the pressure regulating unit, in the present embodiment, the pressure regulating unit comprises a pressure regulating chamber arranged on the lower shell, and a pressure regulating valve seat 12 is arranged in the pressure regulating chamber, which is sealed with the pressure regulating chamber wall. Specifically, the pressure regulating valve seat 12 is sealed with the pressure regulating chamber wall by a fourth sealing ring 45, and at the same time, is fixed by a first retaining ring 52 installed on the pressure regulating chamber wall and the pressure regulating chamber wall to form a step structure; the pressure regulating chamber is divided into a first pressure regulating chamber 13 and a second pressure regulating chamber 14 by the pressure regulating valve seat 12, and the two are connected through a valve seat through hole 15 arranged on the pressure regulating valve seat 12, and at the same time, the first pressure regulating chamber 13 is connected with the control chamber 10 through a pressure regulating channel 16; in the first A first spring 17 and a pressure regulating valve 18 matched with the first spring 17 are arranged in the pressure regulating chamber 13. The air pressure flow can flow through the pressure regulating valve 17 or the outside of the pressure regulating valve 17. In order to make the first spring 17 more stable during installation and movement, a spring positioning seat 30 is also arranged in the first pressure regulating chamber 13. One end of the first spring 17 is sleeved on the spring positioning seat 30. The spring positioning seat 30 is also provided with a through hole, and its two ends are respectively connected with the first pressure regulating chamber 13 and the pressure regulating channel 16. As for the shape of the spring positioning seat 30, it is not specifically limited. In the present embodiment, it is a frustum. The pressure regulating valve 18 is selected to have a rubber or silicone structure with a skeleton, and its outer The contour is similar to the wall structure of the first pressure regulating chamber 13 here, and there is a ventilation gap between the two; a sliding sealed pressure regulating piston 19 is arranged in the second pressure regulating chamber 14, and the structure of the pressure regulating piston 19 is not specifically limited. Generally, a cylindrical structure is selected, such as a cylindrical shape. Of course, in order to achieve sealing or adapt to other structures, a groove body or a cavity is formed on the pressure regulating piston 19. The above-mentioned sealing structure is an existing sliding sealing structure, such as a seal between the pressure regulating piston 19 and the wall of the second pressure regulating chamber 14, such as a fifth sealing ring 46. As for how the seal is fixedly installed, this is common in the art, such as through a groove body, and the seal is installed in the groove body; one end of the pressure regulating piston 19 forms a resistance section 20, the abutment section 20 passes through the valve seat through hole 15 and abuts against the pressure regulating valve 18, and a first channel 21 is formed between the abutment section 20 and the side wall of the valve seat through hole; a second channel 22 is formed between the pressure regulating piston 19 and the pressure regulating valve seat 12, and the two ends of the first channel 21 are respectively connected to the first pressure regulating chamber 13 and the second channel 22, and the structure of the second channel is not specifically limited and can be established separately. In this embodiment, it is the space between the pressure regulating piston 19 and the pressure regulating valve seat 12 except for the first retaining ring 52, so that the space between the components is effectively utilized and the structure is simple; the second channel 22 is also connected to the Echizen chamber 8 through the third channel 23;A second spring 24 is also provided in the second pressure regulating chamber 14, and the two ends of the second spring 24 are respectively abutted against the pressure regulating piston 19 and the end structure of the second pressure regulating chamber 14. Specifically, the end structure of the second pressure regulating chamber 14 includes a spring cap 25 connected to the side wall of the second regulating chamber 14, and the connection form is screw connection. A first spring seat 26 is provided in the spring cap 25, and the two ends of the second spring 4 are respectively connected to the pressure regulating piston 19 and the first spring seat 26; and an adjusting bolt 27 is also included, and the adjusting bolt 27 passes through the spring cap 25 and the first spring seat 26. The first spring seat 27 abuts against the first spring seat 26; it also includes a tightening nut 28, which is screwed on the adjusting bolt 27 to achieve the stability of the adjusting bolt 27, prevent the adjusting bolt 27 from loosening, and achieve the stability of the entire process, especially when the inflection point pressure changes; in order to prevent dust from the adjusting unit, a dust cover 29 is also provided on the spring cap 25, and the adjusting bolt 27 passes through the dust cover 29 and the spring cap 25 abuts against the first spring seat 26, and as the pressure in the control chamber 10 changes, the adjusting piston 19 slides. ;

[0033] As for the intake and exhaust decoupling strand, its structure is not specifically limited, and the structure of realizing the intake and exhaust function in the existing relay valve can also be adopted. In the present embodiment, the intake and exhaust structure includes a second spring seat 33 arranged at the bottom of the piston cavity 3, and a third spring cavity 35 is formed on the second spring seat 33, in which a third spring 34 is placed, and also includes a sealing cover structure 36, and the sealing cover structure 36 cooperates with the third spring 34 and the second spring seat 33, and a sealing surface is formed on the sealing cover structure 36, wherein the second spring 33 can be made of a plastic part, and the sealing cover structure 36 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 in detail here; it also includes a gland ring 37 arranged on the side wall of the piston cavity 3, and the gland ring 37 abuts against the sealing surface. The structure of the gland ring 37 is not specifically limited, and is preferably annular. Of course, its cross-section can be square, rectangular, L-shaped, The Z-shaped structure has various arrangements. It is fixed by a second retaining ring 53 arranged thereon and a groove structure in which the second retaining ring 53 is placed. At the same time, it is sealed around by a seventh sealing ring 48. An air storage chamber 39 connected to the air inlet 38 is formed around the second spring seat 33, wherein the number of the air inlet 38 is not limited. In the present embodiment, two are preferred, which can accelerate the braking response during braking. The air inlet 38 is connected to the air reservoir. An air outlet channel 40 is formed in the second spring seat 33, which is connected to an air outlet 54 arranged on the lower shell 2. The air outlet channel 40 is a hollow part of the hollow third spring seat 33. 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 air outlet 54 is connected to the muffler assembly 41 arranged on the lower shell. The end of the valve section 9 cooperates with the sealing surface to realize the air intake and exhaust functions.

[0034] In order to reduce the weight of the entire structure, a material stealing groove 57 is formed on the lower shell 2 . The structure of the material stealing groove 57 is not specifically limited. Specifically, the material stealing groove 57 is connected to the spacer 55 .

[0035] The working principle of the large flow adjustable double-Echizen proportional relay valve of the present invention is as follows:

[0036] In the present invention, if Figure 1 As shown, there are four air flow channels, among which channel A is the control inlet 31 leading to the space above the piston pressure plate; channel B is the air inlet 38 leading to the air storage chamber 39 leading to the control chamber 10 leading to the control outlet; channel C is the control chamber 10 leading to the pressure regulating channel 16 leading to the first pressure regulating chamber; channel D is the first channel 21 leading to the second channel 22 leading to the third channel 23 leading to the Echizen chamber 8.

[0037] Principle of non-working state: the high-pressure gas from the two air inlets 38 flows into the air storage chamber 39 and is sealed and does not flow in the air storage chamber 39, that is, half of the B channel.

[0038] like Figure 4 As shown, the working principle of the first section of the curve K1 with an output ratio of 1.5 is: the driver steps on the pedal of the brake master valve, and the air pressure of the brake master valve flows through the control inlet 31 along the channel A to exert air pressure on the piston pressure plate 4 of the piston, pushing the piston downward to push the sealing cover structure 36, and open the seal between the sealing cover structure 36 and the gland ring 37. At this time, the air pressure flow in the air storage chamber 39 enters the control chamber 10, and then enters the control outlet 32, that is, the other half of the B channel. At the same time, the air pressure flow of the control chamber 10 enters the C channel along the D channel and then enters the Echizen chamber 8. At this time, the output ratio of this section is (S1-S5) / (S2-S4)=1.5, that is Figure 4 The K1 section in the figure, wherein S1 is the outer diameter area of ​​the piston pressure plate 4, S2 is the outer diameter area of ​​the piston upward force, S4 is the outer diameter area of ​​the valve section 9, and S5 is the outer diameter area of ​​the column section. At this time, the air pressure in the first pressure regulating chamber 13 acts on the pressure regulating piston 19 through the first channel 21, but the force is not enough to compress the second spring 24 to make the pressure regulating valve 18 contact and close with the pressure regulating valve seat 12.

[0039] like Figure 4 As shown, the working principle of the curve K2 of the second section with an output ratio of 3 is as follows: as the piston continues to move downward, the air pressure in the air storage chamber 39 entering the control chamber 10 continues to increase and drives the air pressure at the control outlet 32 ​​to increase to the inflection point G1. At this time, the force of the air pressure in the first pressure regulating chamber 13 acting on the pressure regulating piston 19 through the first channel 21 is sufficient to overcome the spring force of the second spring 24 and make the pressure regulating valve 18 contact and close with the pressure regulating valve seat 12. At this time, the air pressure in the front chamber 8 cannot continue to rise; thereafter, as the air pressure at the control inlet 31 continues to rise, the output ratio is (S1-S5) / (S3-S4)=3, that is, Figure 4 The K2 segment in .

[0040] When the air pressure in the control chamber 10 rises to the inflection point pressure G2, the piston has completely pushed open the sealing cover structure. At this time, the pressure in the control chamber 10 is equal to the pressure at the air inlet 38, that is, Figure 4 The K3 segment in .

[0041] The value of the inflection point G1 can be changed by adjusting the relative compression amount between the adjusting bolt 27 and the second spring 24 .

[0042] 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 large flow adjustable double Echizen proportional relay valve, characterized in that: The invention comprises a shell, wherein the shell comprises an upper shell and a lower shell which are sealed and connected; a piston cavity is formed in the shell, a piston which can reciprocate is arranged in the piston cavity, and the piston comprises a piston pressure plate, and the peripheral edge of the piston pressure plate or the peripheral edge above or the peripheral edge below the peripheral edge is slidingly sealed with the side wall of the piston cavity; a first annular structure and a second annular structure are formed below the piston pressure plate, the first annular structure and the second annular structure are arranged radially, a certain interval is formed between the first annular structure and the side wall of the piston cavity, and a breathing structure is arranged on the side wall of the interval; the first annular structure and the The second annular structure and the third annular structure formed by the shell in the piston cavity are slidably sealed, and a Yueqian cavity is formed between the three; a valve section is also formed below the piston pressure plate, a control cavity is formed around the valve section, and an intake and exhaust structure controlled by the valve section is arranged below the valve section; it also includes a pressure regulating unit, which is connected to the Yueqian cavity and the control cavity respectively, and the pressure output of the control cavity is realized by the pressure change in the Yueqian cavity and the control cavity to realize different braking; when working, the upper side of the piston pressure plate is connected to the control inlet air pressure, the piston moves downward to open the valve, and the control cavity is connected to the air inlet pressure; After the air pressure in the control chamber increases, the pressure regulating unit closes the connection between the front chamber and the control chamber, thereby achieving different output ratios.

2. The large flow adjustable double-Echizen proportional relay valve according to claim 1 is characterized in that: A column section that is slidably sealed with the valve section is formed on the upper shell, and the column section is arranged through the valve section.

3. The large flow adjustable double-Echizen proportional relay valve according to claim 2 is characterized in that: A limiting groove matched with the first annular structure is formed on the lower shell.

4. The large flow adjustable double-Echizen proportional relay valve according to any one of claims 1 to 3, characterized in that: The pressure regulating unit comprises a pressure regulating chamber arranged on the lower shell, a pressure regulating valve seat sealed with the pressure regulating chamber wall is arranged in the pressure regulating chamber, the pressure regulating chamber is separated into a first pressure regulating chamber and a second pressure regulating chamber by the pressure regulating valve seat, the two are connected through a valve seat through hole arranged on the pressure regulating valve seat, the first pressure regulating chamber is connected with the control chamber through a pressure regulating channel; a first spring and a pressure regulating valve matched with the first spring are arranged in the first pressure regulating chamber, and the airflow flows through the pressure regulating valve or the outer side of the pressure regulating valve; a sliding sealed pressure regulating piston is arranged in the second pressure regulating chamber, 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 the pressure-regulating valve, and a first channel is formed between the resistance section and the side wall of the valve seat through hole; a second channel is formed between the pressure-regulating piston and the pressure-regulating valve seat, and the two ends of the first channel are respectively connected to the first pressure-regulating chamber and the second channel; the second channel is also connected to the Echizen chamber through a third channel; and a second spring is also included, and the two ends of the second spring abut against the end structures of the pressure-regulating piston and the second pressure-regulating chamber respectively; as the pressure in the control chamber changes, the pressure-regulating piston slides.

5. The large flow adjustable double Echizen proportional relay valve according to claim 4 is characterized in that: The end structure of the second pressure regulating chamber includes a spring cap connected to the side wall of the second pressure regulating chamber, a first spring seat is arranged in the spring cap, and two ends of the second spring are respectively abutted against the pressure regulating piston and the first spring seat; and also includes an adjusting bolt, which passes through the spring cap and abuts against the first spring seat.

6. The large flow adjustable double Echizen proportional relay valve according to claim 5, characterized in that: It also includes a tightening nut, which cooperates with the adjusting bolt.

7. The large flow adjustable double-Echizen proportional relay valve according to claim 6, characterized in that: It also includes a dust cover, which is arranged on the spring cap. The adjusting bolt passes through the dust cover and the spring cap and abuts against the first spring seat.

8. The large flow adjustable double-Echizen proportional relay valve according to claim 7, characterized in that: A spring positioning seat is also arranged in the first pressure regulating chamber, the first spring is sleeved on the spring positioning seat, and the spring positioning seat is also formed with a through hole, both ends of which are respectively connected with the control chamber and the first pressure regulating chamber.

9. The large flow adjustable double-Echizen proportional relay valve according to claim 8, characterized in that: One control inlet and four control outlets are formed on the shell.

10. The large flow adjustable double-Echizen proportional relay valve according to claim 9, characterized in that: The air intake and exhaust structure includes a second spring seat arranged at the bottom of the piston cavity, and a third spring cavity for placing a third spring is formed on the second spring seat; 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 gland ring sealed with the side wall of the piston cavity, and 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, which is connected to the air outlet, and the air outlet is connected to the muffler assembly arranged on the shell; the end of the valve section cooperates with the sealing surface to realize the air intake and exhaust function; there are two air inlets.

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