A pressure-boosting adjustable brake valve

Abstract

The invention discloses a boost adjustable brake valve, including a valve body, a boost control chamber, a breathing chamber, a main control chamber and a brake chamber are arranged in the valve body, a boost piston is arranged between the boost control chamber and the breathing chamber, a sealing partition is arranged between the breathing chamber and the main control chamber, a main piston is arranged between the main control chamber and the brake chamber, an adjusting screw is screwed on the main piston, a screwing portion is arranged at the bottom end of the adjusting screw, a boost contact portion is arranged at the top end of the adjusting screw, an elastic sleeve is arranged at the top of the sealing partition, and a circumferential limit hole is arranged in the elastic sleeve to cooperate with the boost contact portion. The invention has a boost function and can quickly adjust the boost effect of the boost piston. The unique structure can achieve quantitative adjustment of the boost effect, so that the user can intuitively understand the internal adjustment amount, and then achieve accurate adjustment action, which greatly reduces the difficulty of debugging, avoids repetitive work, improves work efficiency, and is extremely practical.

Description

Technical Field

[0001] The invention relates to the technical field of a pressure-boosting adjustable brake valve for automobiles, in particular to a pressure-boosting adjustable brake valve. Background Art

[0002] With the increasing development of automobile manufacturing and transportation industries, the technical requirements for brake valves for motor vehicles, especially for tractor trailers, are becoming increasingly higher, which is directly related to driving safety. In the invention patent specification with the publication number "CN212098810U", an internally adjusted automatic proportional brake valve is disclosed, which includes a main piston and a booster piston acting on the main piston. The booster piston plays a boosting role on the main piston. In order to meet different usage needs, the brake valve also has a structure for adjusting the boosting effect of the booster piston. However, the internal structure of the brake valve with this structure is relatively complex, and there are disadvantages such as inconvenient assembly and poor maintenance in the later stage. In addition, since it adopts a stepless adjustment method, it is impossible to accurately judge the boosting effect of the booster piston, and it needs to be adjusted repeatedly for many times, and there is a lot of room for improvement. Summary of the invention

[0003] The purpose of the present invention is to avoid the deficiencies of the prior art and provide a boost adjustable brake valve, thereby effectively solving the deficiencies in the prior art.

[0004] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a booster adjustable brake valve, including a valve body, wherein a booster control chamber, a breathing chamber, a main control chamber and a brake chamber are arranged in the valve body from top to bottom, a booster piston is arranged between the booster control chamber and the breathing chamber so as to be sealable and slidable, a sealing partition is fixedly arranged between the breathing chamber and the main control chamber, a main piston is arranged between the main control chamber and the brake chamber so as to be sealable and slidable, a threaded sleeve is arranged on the main piston, a through hole for sealing and sliding of the threaded sleeve is arranged on the sealing partition, an adjusting screw is threadedly connected in the threaded sleeve, a screwing portion is arranged at the bottom end of the adjusting screw, a booster contact portion is arranged at the top end of the adjusting screw, an elastic sleeve is arranged at the top of the sealing partition, and a circumferential limit hole is arranged in the elastic sleeve to cooperate with the booster contact portion;

[0005] The boosting piston is provided with a boosting contact surface to cooperate with the boosting contact portion.

[0006] When the boost contact part rotates, the circumferential limit hole realizes passive expansion to cooperate with the boost contact part to complete the rotation action. When the boost contact part rotates a certain angle, the circumferential limit hole realizes shrinkage to realize the circumferential limit between the boost contact part and the boost contact part again.

[0007] A boost return spring is provided between the elastic sleeve and the boost piston;

[0008] The booster piston, the sealing partition, the elastic sleeve, the booster contact portion and the valve body form the breathing chamber;

[0009] The sealing partition, the main piston and the valve body enclose the main control chamber;

[0010] A gas charging and discharging actuator is arranged below the brake chamber, which can replenish gas into the gas storage tank and cooperate with the main piston to release the compressed gas in the gas storage tank.

[0011] Furthermore, the valve body is provided with a main air inlet, a boost air inlet and a brake air outlet;

[0012] The main air inlet is in communication with the main control chamber;

[0013] The boost air inlet is in communication with the boost control chamber;

[0014] The brake air outlet is communicated with the brake chamber.

[0015] Furthermore, the elastic sleeve includes an annular portion located on the lower side and a plurality of card petals located on the upper side and evenly arranged along the circumferential direction, with gaps provided between the card petals, the card petals enclosing the circumferential limiting hole, the horizontal cross-section of the boost contact portion is a polygon, the number of the card petals is consistent with the number of sides of the polygon, and each card petal achieves a separate contact with one side of the boost contact portion.

[0016] Furthermore, a protrusion is provided between the annular portion and the clamping flap for clamping and fixing with the boost return spring.

[0017] Furthermore, the sealing baffle and the main piston are provided with a circumferential anti-rotation structure.

[0018] Further, the inflation and deflation actuator includes a movable seat arranged in the valve body and capable of sealing and moving up and down, a lower limit bracket is arranged on the valve body to cooperate with the movable seat, an adjustment hole directly opposite to the adjustment screw is arranged on the lower limit bracket, a blocking member is detachably arranged in the adjustment hole, a valve core is arranged in the movable seat and capable of moving up and down, and a sealing spring is arranged between the valve core and the movable seat;

[0019] The movable seat and the valve core form an opening and closing cavity, the valve body and the middle part of the movable seat form an annular cavity, and the movable seat is provided with a through hole for connecting the opening and closing cavity and the annular cavity.

[0020] The valve body is provided with a compressed gas replenishing port connected to the annular cavity, and a one-way valve structure is provided between the compressed gas replenishing port and the annular cavity to allow the compressed gas to flow from the compressed gas replenishing port to the annular cavity;

[0021] The valve body is also provided with an air source interface connected to the annular cavity, and the valve core abuts against the movable seat under the action of the sealing spring to cut off the communication between the brake cavity and the air source interface;

[0022] The valve body and the upper part of the movable seat enclose a pressure maintaining chamber, and the pressure maintaining chamber is directly connected to the compressed gas replenishing port;

[0023] Furthermore, the lower limit bracket is provided with an exhaust hole, an elastic dustproof pad is installed at the bottom of the lower limit bracket, the elastic dustproof pad covers the exhaust hole, and the movable seat is provided with an exhaust channel for connecting the brake chamber and the exhaust hole.

[0024] Furthermore, the movable seat is a split structure, which includes an upper half and a lower half that are detachably connected.

[0025] The above technical scheme of the present invention has the following beneficial effects: all the structural parts of the present invention are integrated into the valve body, the appearance is neat and the overall structure is compact, it is easy to assemble, and it is convenient for later maintenance; the present invention has a boosting function and can quickly adjust the boosting effect of the boosting piston, and it is easy to use. During the adjustment process, the quantitative adjustment of the boosting effect can be achieved through the unique structure, so that the user can intuitively understand the internal adjustment amount, and then realize precise adjustment action. Compared with the blind adjustment in the prior art, the debugging difficulty is greatly reduced, repetitive work is avoided, work efficiency is improved, and it is extremely practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of an embodiment of the present invention;

[0027] Figure 2 This is a diagram showing the matching state of the elastic sleeve and the adjusting screw in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the three-dimensional structure of the elastic sleeve according to an embodiment of the present invention;

[0029] Figure 4 It is a top view of the elastic sleeve according to an embodiment of the present invention. DETAILED DESCRIPTION

[0030] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the present invention, unless otherwise specified, "multiple" means two or more than two; the orientations or positional relationships indicated by the terms "upper", "lower", "left", "right", "inner", "outer", "front end", "rear end", "head", "tail", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "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 directly connected or indirectly connected through an intermediate medium. 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.

[0032] like Figure 1 As shown, a boost adjustable brake valve described in this embodiment includes a valve body 1, which includes an upper and lower part. The two parts are detachably connected by a flange and bolts to facilitate the assembly of internal parts and subsequent maintenance.

[0033] A boost control chamber A, a breathing chamber B, a main control chamber C and a brake chamber D are arranged in the valve body 1 from top to bottom. A boost piston 2 is arranged between the boost control chamber A and the breathing chamber B in a sealing and slidable manner. A sealing ring is arranged between the boost piston 2 and the valve body 1. An annular groove for clamping the sealing ring is arranged on the boost piston 2. The boost piston 2 serves to separate the boost control chamber A and the breathing chamber B. That is, as the boost piston 2 moves up and down, the inner cavity space of the boost control chamber A and the breathing chamber B will change accordingly. When the boost piston 2 moves downward, the space of the boost control chamber A increases, and the space of the breathing chamber B decreases. Conversely, when the boost piston 2 moves upward, the space of the boost control chamber A decreases, and the space of the breathing chamber B increases. A breathing channel for connecting the breathing chamber B with the outside is arranged on the valve body 1. When the breathing chamber B increases, the outside air is sucked in through the breathing channel. When the breathing chamber B decreases, the excess air inside is discharged through the breathing channel.

[0034] A sealing partition 3 is fixedly arranged between the breathing chamber B and the main control chamber C, a sealing ring is arranged between the sealing partition 3 and the valve body 1, an annular groove for clamping the sealing ring is arranged on the sealing partition 3, a limiting step is arranged on the bottom outer edge of the valve body 1 to cooperate with the sealing partition 3, a retaining spring is arranged on the top outer edge of the valve body 1 to cooperate with the sealing partition 3, and an annular groove for installing the retaining spring is arranged on the valve body 1. With the cooperation of the retaining spring and the limiting step, the position of the sealing partition 3 is fixed.

[0035] A main piston 4 is provided between the main control chamber C and the brake chamber D in a sealing and slidable manner, a sealing ring is provided between the main piston 4 and the valve body 1, and an annular groove for clamping the sealing ring is provided on the main piston 4.

[0036] A threaded sleeve 4a is provided on the main piston 4. The threaded sleeve 4a is integrally formed on the main piston 4 and is located in the middle of the main piston 4. The threaded sleeve 4a is extended upward compared to the main piston 4. A through hole 3a is provided on the sealing partition 3 for the threaded sleeve 4a to slide in a sealed manner. A sealing ring is provided between the sealing partition 3 and the threaded sleeve 4a. An annular groove for clamping the sealing ring is provided on the sealing partition 3. An adjusting screw 5 is threadedly connected in the threaded sleeve 4a. A screwing portion 5a is provided at the bottom end of the adjusting screw 5. The screwing portion 5a can be a common knob structure such as a hexagonal screw groove. The corresponding tool is matched with the screwing portion 5a to realize the screwing action of the adjusting screw 5. A pressurized contact portion 5b is provided on the top of the adjusting screw 5. An elastic sleeve 6 is provided on the top of the sealing partition 3. The elastic sleeve 6 is fitted with the sealing partition 3, and a circumferential limiting hole 6a is provided in the elastic sleeve 6 to cooperate with the pressurized contact portion 5b.

[0037] The booster piston 2 is provided with a booster contact surface 2a in cooperation with the booster contact portion 5b. When the booster piston 2 moves downward, the booster contact surface 2a contacts the top of the booster contact portion 5b, thereby pressurizing the main piston 4 when the booster piston 2 continues to move downward.

[0038] When the boost contact part 5b rotates, the circumferential limit hole 6a realizes passive expansion to cooperate with the boost contact part 5b to complete the rotation action. When the boost contact part 5b rotates a certain angle, the circumferential limit hole 6a realizes shrinkage to re-realize the circumferential limit between the boost contact part 5b.

[0039] A boosting return spring 7 is provided between the elastic sleeve 6 and the boosting piston 2 , which can assist in returning the boosting piston 2 .

[0040] When the boost piston 2 is at the upper limit position, the boost return spring 7 is still in a pre-compression state, so the boost return spring 7 will always give a downward pressure to the sealing baffle 4, so that the sealing baffle 4 can be pressed tightly under the action of pressure and will not rotate in the circumferential direction, that is, the sealing baffle 4 is in a completely fixed state. Similarly, under the pressure of the boost return spring 7, the boost piston 2 and the elastic sleeve 6 will not rotate.

[0041] The upper side of the boost piston 2 and the valve body 1 enclose the boost control chamber A mentioned above.

[0042] The boost piston 2, the sealing partition 3, the elastic sleeve 6, the boost contact portion 5b, the boost return spring 7 and the valve body 1 enclose the breathing chamber B mentioned above.

[0043] The sealing partition 3, the main piston 4 and the valve body 1 enclose the main control chamber C mentioned above.

[0044] The valve body 1 is provided with a main air inlet 8, a boost air inlet 9 and a brake air outlet 10, wherein the main air inlet 8 is connected with the main control chamber C, the boost air inlet 9 is connected with the boost control chamber A, and the brake air outlet 10 is connected with the brake chamber D. One or more brake air outlets 10 may be provided.

[0045] The main air inlet 8 and the boost air inlet 9 share one air inlet, and the air inlet structure is arranged on the joint surface of the valve body 1. In order to ensure the sealing of the connection, a sealing sleeve 22 is provided at the joint.

[0046] The elastic sleeve 6 includes an annular portion 6b located on the lower side and a plurality of petals 6c located on the upper side and evenly arranged along the circumferential direction. Gaps are provided between the petals 6c. The petals 6c enclose the above-mentioned circumferential limiting holes 6a. The horizontal cross-section of the boost contact portion 5b is a polygon. The number of petals 6c is consistent with the number of sides of the polygon. Each petal 6c makes separate contact with one side of the boost contact portion 5b. The elastic sleeve 6 is an integrated spring-type plastic structure.

[0047] like Figure 2 As shown, in this embodiment, the boost contact portion 5b is a regular hexagonal structure, and 6 flaps 6c are correspondingly provided. In this way, the boost contact portion 5b is just clamped in the circumferential limiting hole 6a surrounded by the 6 flaps 6c. When the boost contact portion 5b rotates, it presses the flap 6c outward, and the flap 6c moves outward to provide space for the rotation of the boost contact portion 5b. After the boost contact portion 5b rotates 60°, each side of the boost contact portion 5b corresponds to each flap 6c again. At this time, the flap 6c is in the position of the boost contact portion 5b. It is reset under the action of its own elastic force and re-fitted with each surface of the pressurized contact part 5b to achieve a close matching effect. During actual operation, the card flap 6c will collide with the pressurized contact part 5b at the moment of resetting, and will make a "click" sound, which allows the operator to intuitively realize that it has been rotated 60°. If it needs to be rotated 180°, three consecutive "clicks" are sufficient, thereby achieving quantitative adjustment. Compared with the blind adjustment in the prior art, it greatly improves work efficiency and brings great convenience to actual use.

[0048] Based on the above principle, the structure of the boost contact part can be adjusted according to actual conditions. For example, when it is made into an octagonal structure, that is, eight petals are provided, the next connectable action can be completed by twisting 45° each time, that is, a 45° rotation can be completed at a fixed angle each time.

[0049] A protrusion 6d for clamping and fixing with the boost return spring 7 is arranged between the annular portion 6b and the clamping flap 6c. The clamping and fixing is achieved by the protrusion 6d and the inner side of the boost return spring 7. In this way, there is a certain gap between the outer side of the clamping flap 6c and the inner side of the boost return spring 7, providing space for the clamping flap 6c to move outward.

[0050] The sealing baffle 3 and the main piston 4 are provided with a circumferential anti-rotation structure. Since the sealing baffle 3 is in a completely fixed state, after the circumferential anti-rotation structure is provided between the sealing baffle 3 and the main piston 4, the main piston 4 will no longer produce circumferential rotation, which facilitates the screwing of the adjusting screw 5.

[0051] In this embodiment, the circumferential anti-rotation structure includes a limit groove 3b arranged on the sealing partition 3 and a limit rod 4b arranged on the main piston 4. The limit rod 4b is inserted into the limit groove 3b. The size of the limit groove 3b is slightly larger than the limit rod 4b to ensure that it will not affect the normal movement of the main piston 4. There are multiple limit grooves and limit rods evenly arranged along the circumference to achieve stable cooperation between the main piston 4 and the sealing partition 3.

[0052] A gas charging and discharging actuator is provided below the brake chamber D, which can replenish gas into the gas tank and cooperate with the main piston 4 to release the compressed gas in the gas tank. The gas charging and discharging actuator structure can directly adopt the structure described in the invention patent specification with the publication number "CN212098810U". Of course, the present invention has made further improvements on the basis of using the structural functions in the prior art, so that the overall structure of the gas charging and discharging actuator is more reasonable, more conducive to assembly and later maintenance, and the specific structure is as follows:

[0053] The inflation and deflation actuator includes a movable seat 11 which can be sealed and moved up and down and is arranged in the valve body 1. A lower limit bracket 12 is arranged on the valve body 1 to cooperate with the movable seat 11. A retaining spring is arranged on the valve body 1. The retaining spring is fitted with the bottom edge of the lower limit bracket 12 to limit the position of the lower limit bracket 12. The lower limit bracket 12 is used to limit the lower limit position of the movable seat 11.

[0054] The lower limit bracket 12 is provided with an adjustment hole 12a which is opposite to the adjustment screw 5, and a sealing member 13 is detachably provided in the adjustment hole 12a. In the present embodiment, the sealing member 13 is a screw, and a thread is provided in the adjustment hole 12a to cooperate with the screw. A valve core 14 is provided in the movable seat 11 to be movable up and down, and the valve core 14 is made of rubber material. A sealing spring 15 is provided between the valve core 14 and the movable seat 11, and a vertical guide structure is provided on the movable seat 11 to cooperate with the valve core 14. The movable seat 11 is also provided with an annular accommodating groove for facilitating the positioning and installation of the sealing spring 15, and an annular installation groove is provided at the bottom of the valve core 14 to cooperate with the sealing spring 15. The valve core 14 is an annular structure with a hole in the middle.

[0055] An opening and closing cavity E is enclosed between the movable seat 11 and the valve core 14, and an annular cavity F is enclosed between the valve body 1 and the middle of the movable seat 11. Sealing rings are arranged between the upper and lower sides of the movable seat 11 and the valve body 1, wherein the annular cavity F is located between the sealing rings on both sides. A through hole 11a for connecting the opening and closing cavity E and the annular cavity F is arranged on the movable seat 11, and a plurality of through holes 11a are arranged.

[0056] The valve body 1 is provided with a compressed gas replenishing port 16 which is connected with the annular cavity F. A one-way valve structure is provided between the compressed gas replenishing port 16 and the annular cavity F so that the compressed gas can flow from the compressed gas replenishing port 16 to the annular cavity F. The one-way valve structure includes a top screw 17, a one-way valve spring 18 and a valve plug 19. When the compressed gas enters the compressed gas replenishing port 16, the compressed gas drives the valve plug 19 to move downward, so that a gap is formed between the valve plug 19 and the valve body 1 for the compressed gas to pass through, thereby realizing the passage of the compressed gas.

[0057] The valve body 1 is also provided with an air source interface 20 communicating with the annular cavity F. The valve core 14 abuts against the movable seat 11 under the action of the sealing spring 15 to cut off the communication between the brake cavity D and the air source interface 20 .

[0058] The valve core 14 is provided with a breathing hole which runs through from top to bottom. The breathing hole is located on the inner side of the contact position between the valve core 14 and the movable seat 11, and will not affect the sealing fit between the valve core 14 and the movable seat 11. The breathing hole is used to connect the installation chamber where the sealing spring 15 is located and the brake chamber D, so that the movement of the sealing spring 15 can be smoothly realized, that is, when the valve core 14 moves downward, the gas in the installation chamber where the sealing spring 15 is located is discharged through the breathing hole, and when the valve core 14 moves upward, the gas in the installation chamber where the sealing spring 15 is located is replenished through the breathing hole.

[0059] The valve body 1 and the upper part of the movable seat 11 enclose a pressure maintaining chamber G, and the pressure maintaining chamber G is directly connected to the compressed gas replenishing port 16 .

[0060] An exhaust hole 12b is provided on the lower limit bracket 12, and an elastic dustproof pad 21 is installed at the bottom of the lower limit bracket 12. The elastic dustproof pad 21 covers the exhaust hole 12b to prevent dust. The movable seat 11 is provided with an exhaust channel 11b for connecting the brake chamber D with the exhaust hole 12b.

[0061] The movable seat 11 is a split structure, which includes a detachably connected upper half and a lower half. Specifically, the upper half and the lower half can be connected by a threaded structure, and the connection is sealed with an O-ring. Compared with the traditional spring-type fixed valve core, it reduces the processing links and reduces the difficulty of assembly. The two parts of the movable seat 11 are integrally injection molded by engineering plastics, which eliminates the stubborn problem of high porosity in die-casting and greatly improves the product qualification rate. Through the movable seat 11 of this structure, the internal structure of the movable seat 11 can be installed first, and then the entire movable seat 11 can be directly installed. Compared with the inflation and deflation actuator in the existing structure, the structure in the present invention has strong integrity, contains fewer independent components, and is more convenient for assembly and subsequent maintenance.

[0062] The internal accessories of the present invention (boosting piston 2, sealing partition 3, main piston 4, elastic sleeve 6, movable seat 11, lower limit bracket 12, etc.) are made of engineering plastics by integral injection molding, without secondary processing, reducing the number of processes, and eliminating the disadvantages of pores in the die-casting process. For large-sized seals, an internal support seal ring can be used. Since the seal ring has a large tension range and a good sealing effect, and the tolerance range between the seal ring and the sliding surface is large, the friction between the seal and the sliding surface is small, which extends the service life and maintenance cycle of the seal. The movable seat adopts a threaded connection, which reduces the use of retaining springs, saves energy, and reduces carbon dioxide emissions. The structure uses fewer accessories, and the valve body must be processed in a machining center compared to other booster valve adjustment valves. The valve can be processed on a CNC lathe, saving manufacturing costs, being easy to assemble, and facilitating later maintenance.

[0063] With the advancement of science and technology, new materials are constantly emerging, bringing new vitality to the brake valve. The present invention utilizes new materials and adopts a completely non-processing method for internal parts according to different positions and working conditions of use, which reduces the weight of the valve, reduces the process, shortens the manufacturing cycle, improves the manufacturing yield, and reduces production costs.

[0064] The working principle of the present invention is:

[0065] In the initial state, it is necessary to supplement the gas storage tank (not shown) with pressurized gas, that is, the pressure source introduces compressed gas through the compressed gas supplement port 16, the one-way valve structure opens, and the compressed gas enters the annular cavity F, and then enters the gas storage tank through the gas source interface 20, completing the compressed gas storage work and preparing for the subsequent work;

[0066] When braking is needed, the compressed gas is controlled to enter the main air inlet 8 and the boost air inlet 9 at the same time by means of a foot pedal or other braking method, and then the compressed gas enters the main control chamber C and the boost control chamber A, so that the main piston 4 and the boost piston 2 are simultaneously subjected to a downward pressure. When the downward pressure on the main piston 4 is greater than its resistance, the main piston 4 moves downward. Correspondingly, when the downward pressure on the boost piston 2 is greater than its resistance, the boost piston 2 also moves downward. After the boost piston 2 moves a certain distance, the boost contact surface 2a contacts the top of the boost contact portion 5b, and the boost piston 2 moves through the adjustment The section screw 5 and the threaded sleeve 4a exert pressure on the main piston 4, so that the booster piston 2 assists the main piston 4 in pushing it downward, that is, boosting the pressure. Then the bottom of the main piston 4 contacts the valve core 14 and pushes the valve core 14 downward, so that an annular gap is formed between the valve core 14 and the movable seat 11. The compressed gas in the air storage tank passes through the air source interface 20, the annular cavity F, the opening and closing cavity E, the brake cavity D and the brake outlet 10 in sequence and enters the brake pipeline, thereby completing the braking action. Then all related components return to their original positions under the action of the spring and the internal pressure, preparing for the next braking action.

[0067] It should be noted that, under the action of the pressure in the brake chamber D, the main piston 4 can move upward and reset by itself. Of course, a reset spring can also be set between the bottom of the main piston 4 and the valve body 1 to achieve auxiliary reset.

[0068] In actual use, the boosting effect of the boosting piston 2 can be adjusted. The specific adjustment method is as follows:

[0069] First, remove the blocking piece 13 to open the adjusting hole 12a, insert the special tool into the valve body 1 through the adjusting hole 12a and cooperate with the screwing part 5a at the bottom of the adjusting screw 5 to screw the adjusting screw 5. Since the sealing partition 3, the main piston 4 and the elastic sleeve 6 will not rotate circumferentially, when the adjusting screw 5 is screwed, the adjusting screw 5 will move up and down, thereby adjusting the gap between the boost contact surface 2a and the boost contact part 5b. When the gap between the two decreases, under the same pressure state, when the boost piston 2 moves downward, the boost contact surface 2a will contact the boost contact part 5b earlier, thereby achieving the boost effect on the main piston 4. Conversely, when the gap between the two increases, the boost contact surface 2a will contact the boost contact part 5b later.

[0070] This means that under the condition of the same compressed gas, when the adjusting screw 5 is moved upward, the booster piston 2 will provide the booster effect to the main piston 4 earlier, which will make the main piston 4 move downward more, increase the degree of opening of the valve core 14, and the pressure provided by the air tank to the brake line will become larger, which is equivalent to enhancing the braking effect; when the adjusting screw 5 is moved downward, the booster piston 2 will provide the booster effect to the main piston 4 later, which will make the main piston 4 move downward less, reduce the degree of opening of the valve core 14, and the pressure provided by the air outlet pipe to the brake line will become smaller, which is equivalent to weakening the braking effect. Therefore, it can be adjusted according to actual usage habits;

[0071] That is, it can be summarized as follows: when the adjusting screw 5 moves upward, the braking effect is enhanced, and when the adjusting screw 5 moves downward, the braking effect is weakened.

[0072] During the adjustment process, thanks to the unique matching structure between the elastic sleeve 6 and the boost contact part 5b, since the elastic sleeve 6 does not rotate, when the boost contact surface 5b rotates a certain angle and re-matches with the elastic sleeve 6, a "click" sound will be emitted. Therefore, the user can intuitively understand the internal adjustment amount, and then realize precise adjustment action, which greatly reduces the difficulty of debugging, avoids repetitive work, improves work efficiency, and is extremely practical.

[0073] After a braking process is completed, the main piston 4 is reset, and a gap is formed between the main piston 4 and the valve core 14. The compressed gas remaining in the brake pipeline and on the brake element flows back into the brake chamber D, and then enters the exhaust channel 11b through the gap between the main piston 4 and the valve core 14. Then the compressed gas opens the elastic dustproof pad 21 downward, and the compressed gas is discharged to the outside through the exhaust hole 12b to achieve gas unloading. After the action is completed, the elastic dustproof pad 21 is reset under the action of its own elastic force, and the exhaust hole 12b is blocked again, which plays a dust-proof role, so that the components in the valve body 1 are in a better working environment and the service life is extended.

[0074] The present invention also has the function of emergency braking: in normal times, since there is compressed gas at the compressed gas replenishing port 16, while the pressure of the compressed gas pushes open the one-way valve structure, part of the compressed gas exists in the pressure maintaining chamber G, and the pressure in the pressure maintaining chamber G causes the movable seat 11 to move downward and abut against the lower limit bracket 12, that is, the pressure at the compressed gas replenishing port 16 is in a balanced state with the pressure in the gas storage tank. When emergency braking is performed, the compressed gas at the compressed gas replenishing port 16 disappears, and the pressure here is 0, which makes the force driving the movable seat 11 to move upward greater than The movable seat 11 moves upward due to the downward force. During the movement, the valve core 14 first fits with the main piston 4, and finally the top of the movable seat 11 fits with the valve body 1 and stops moving. In this way, the valve core 14 is sealed and connected to the main piston 4, blocking the connection between the opening and closing chamber E and the brake chamber D and the exhaust channel 11b, that is, blocking the connection between the inside of the valve body 1 and the outside world, and an annular gap is formed between the valve core 14 and the movable seat 11. The compressed gas in the air tank enters the brake chamber D through the annular gap, and then enters the brake pipeline, realizing the emergency braking action of cutting off the air.

[0075] The embodiments of the present invention are given for the purpose of illustration and description, and are not intended to be exhaustive or to limit the invention to the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments are selected and described in order to better illustrate the principles and practical applications of the present invention and to enable those of ordinary skill in the art to understand the present invention and thereby design various embodiments with various modifications suitable for specific uses.

Claims

1. A booster adjustable brake valve, comprising a valve body, wherein a booster control chamber, a breathing chamber, a main control chamber and a brake chamber are arranged in the valve body from top to bottom, a booster piston is arranged between the booster control chamber and the breathing chamber in a sealing and sliding manner, a sealing partition is fixedly arranged between the breathing chamber and the main control chamber, and a main piston is arranged between the main control chamber and the brake chamber in a sealing and sliding manner, characterized in that: The main piston is provided with a threaded sleeve, and the sealing partition is provided with a through hole for the threaded sleeve to slide and seal. An adjusting screw is threaded in the threaded sleeve, and a screwing portion is provided at the bottom end of the adjusting screw, and a boost contact portion is provided at the top end of the adjusting screw. An elastic sleeve is provided at the top of the sealing partition, and a circumferential limiting hole is provided in the elastic sleeve to cooperate with the boost contact portion. The elastic sleeve includes an annular portion located on the lower side and a plurality of clasps located on the upper side and evenly arranged along the circumferential direction, and gaps are provided between the clasps. The clasps enclose the circumferential limiting hole, and the horizontal cross-section of the boost contact portion is a polygon, and the number of the clasps is consistent with the number of sides of the polygon, and each clasps realizes a single contact with one side of the boost contact portion; a protrusion for clamping and fixing with a boost return spring is provided between the annular portion and the clasps; The sealing partition and the main piston are provided with a circumferential anti-rotation structure; The boosting piston is provided with a boosting contact surface to cooperate with the boosting contact portion; When the boost contact part rotates, the circumferential limit hole realizes passive expansion to cooperate with the boost contact part to complete the rotation action. When the boost contact part rotates a certain angle, the circumferential limit hole realizes shrinkage to realize the circumferential limit between the boost contact part and the boost contact part again. A boost return spring is provided between the elastic sleeve and the boost piston; The booster piston, the sealing partition, the elastic sleeve, the booster contact portion and the valve body form the breathing chamber; The sealing partition, the main piston and the valve body enclose the main control chamber; A gas charging and discharging actuator is provided below the brake chamber, which can replenish gas into the gas storage tank and cooperate with the main piston to release the compressed gas in the gas storage tank; The inflation and deflation actuator comprises a movable seat which can be moved up and down in a sealed manner and is arranged in the valve body, a lower limit bracket is arranged on the valve body to cooperate with the movable seat, an adjustment hole which is directly opposite to the adjustment screw is arranged on the lower limit bracket, a blocking piece is detachably arranged in the adjustment hole, a valve core is arranged in the movable seat which can be moved up and down, and a sealing spring is arranged between the valve core and the movable seat; The movable seat and the valve core form an opening and closing cavity, the valve body and the middle of the movable seat form an annular cavity, and the movable seat is provided with a through hole for connecting the opening and closing cavity and the annular cavity; The valve body is provided with a compressed gas replenishing port connected to the annular cavity, and a one-way valve structure is provided between the compressed gas replenishing port and the annular cavity to allow the compressed gas to flow from the compressed gas replenishing port to the annular cavity; The valve body is also provided with an air source interface connected to the annular cavity, and the valve core abuts against the movable seat under the action of the sealing spring to cut off the communication between the brake cavity and the air source interface; The valve body and the upper part of the movable seat enclose a pressure maintaining chamber, and the pressure maintaining chamber is directly connected to the compressed gas replenishing port.

2. The pressure-boosting adjustable brake valve according to claim 1, characterized in that: The valve body is provided with a main air inlet, a boost air inlet and a brake air outlet; The main air inlet is in communication with the main control chamber; The boost air inlet is in communication with the boost control chamber; The brake air outlet is communicated with the brake chamber.

3. The pressure-boosting adjustable brake valve according to claim 1, characterized in that: The lower limit bracket is provided with an exhaust hole, and an elastic dustproof pad is installed at the bottom of the lower limit bracket to cover the exhaust hole. The movable seat is provided with an exhaust channel for connecting the brake chamber and the exhaust hole.

4. The boost-adjustable brake valve according to claim 1, characterized in that: The movable seat is a split structure, which includes an upper half and a lower half that are detachably connected.

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