A delayed start device and pneumatic pressure booster

Abstract

The application discloses a delay starting device and a pneumatic supercharger. The delay starting device comprises a pilot control valve, a first pilot gas path and a second pilot gas path. The pilot control valve is connected with the first pilot gas path, the second pilot gas path and a pilot control gas path of a switching valve in the pneumatic supercharger respectively. The first pilot gas path is communicated with an input end of the pneumatic supercharger, and the second pilot gas path is communicated with an output end of the pneumatic supercharger. A valve core of the pilot control valve moves according to a pressure difference between the first pilot gas path and the second pilot gas path, so as to turn on or turn off the pilot control gas path connected with the pilot control valve. The pilot control gas path is used for controlling the switching of the switching valve in the turned-on state, so as to realize the switching of the working position of the switching valve. Through the delay starting device, the high-frequency switching of the pneumatic supercharger in the starting stage can be avoided, the service life of the pneumatic supercharger is improved, useless work of the pneumatic supercharger is reduced, and input flow is saved.

Description

Technical Field

[0001] This invention relates to the field of booster technology, and more particularly to a delayed start device and a pneumatic booster. Background Technology

[0002] The working principle of a pneumatic booster is as follows: through the reciprocating motion of a piston, the output pneumatic pressure continuously increases until the target output pressure is reached. This pneumatic booster typically controls the reciprocating motion of the piston through the switching function of a switching valve, causing the gas located in the booster chamber to be output, thus increasing the output gas pressure.

[0003] During the startup phase of a pneumatic supercharger, the pressure difference between the output and input ends is significant, resulting in a large flow rate through the supercharger. This leads to a high operating frequency within the supercharger, and the high-frequency switching process reduces its lifespan. Furthermore, the supercharger also discharges some of the input gas during startup, causing both a loss of input flow and wasting the work done by the supercharger during high-frequency switching. Summary of the Invention

[0004] In view of this, the present invention provides a delayed start device and a pneumatic booster. The delayed start device, applied to the pneumatic booster, enables delayed start-up of the booster, preventing the switching valve in the booster from switching during the delayed start-up phase. By avoiding high-frequency switching during the start-up process, the lifespan of the booster is improved. Furthermore, since the booster does not switch during the delayed start-up phase, exhaust caused by switching is reduced. This reduces gas input, saves input flow, and thus saves costs; it also avoids ineffective work by the booster.

[0005] To address the aforementioned technical problems, a first aspect of the present invention provides a delayed start device, comprising: a pilot control valve, a first pilot air path, and a second pilot air path; wherein...

[0006] The pilot control valve is connected to the first pilot air path, the second pilot air path, and the pilot control air path of the switching valve in the pneumatic booster; the first pilot air path is connected to the input end of the pneumatic booster, and the second pilot air path is connected to the output end of the pneumatic booster.

[0007] The valve core of the pilot control valve moves according to the pressure difference between the first pilot air path and the second pilot air path to open or close the pilot control air path connected to the pilot control valve; the pilot control air path is used to control the switching valve to switch when it is open, so as to realize the switching of the working position of the switching valve.

[0008] Optionally, the pilot control valve is a shut-off valve, a spool valve, or a combination of both.

[0009] Optionally, the pilot control valve is a two-position valve.

[0010] Optionally, when the pressure difference between the first pilot gas path and the second pilot gas path is greater than a preset threshold, the valve core of the pilot control valve is driven by the pressure difference to remain in the first working position to cut off the pilot control gas path connected to the pilot control valve.

[0011] When the pressure difference between the first pilot gas path and the second pilot gas path is not greater than a preset threshold, the valve core of the pilot control valve is driven by the pressure difference to remain in the second working position so as to open the pilot control gas path connected by the pilot control valve.

[0012] Optionally, the pilot control valve includes a manual adjustment rod and a guide groove; wherein the manual adjustment rod and the guide groove are arranged along the axial direction of the valve core, the manual adjustment rod is disposed in the guide groove, and the manual adjustment rod moves toward the valve core in the guide groove under external pressure to abut against the valve core and push the valve core to move, thereby resetting the pilot control valve.

[0013] To address the aforementioned technical problems, a second aspect of the present invention provides a pneumatic booster, comprising: any of the delayed start devices provided in the first aspect, a pilot control air circuit, a switching valve, an input end for introducing gas, a booster device consisting of a cylinder and two pistons linked by a piston rod, and an output end for outputting the boosted gas; wherein...

[0014] The pilot control valve is connected to the first pilot air path, the second pilot air path, and the pilot control air path respectively; the first pilot air path is connected to the input terminal, and the second pilot air path is connected to the output terminal;

[0015] The valve core of the pilot control valve moves according to the pressure difference between the first pilot air path and the second pilot air path to open or close the pilot control air path connected to the pilot control valve.

[0016] The pilot control air circuit is connected to the switching valve and is used to control the switching valve to switch when it is in the conducting state, so as to switch the working position of the switching valve.

[0017] Optionally, the pneumatic booster further includes: a triggering device; wherein,

[0018] The pilot control air path includes a first control air path connected to the triggering device and a second control air path connected to the switching valve.

[0019] The triggering device is disposed in the cylinder. When the triggering device is struck by the piston, it controls the switching valve to switch through the first control air path and the second control air path to achieve the switching of the piston's movement direction.

[0020] Optionally, the piston includes a first piston and a second piston linked by a piston rod; a middle block is provided in the middle region of the cylinder; the piston rod passes through the middle block, and the first piston and the second piston are respectively disposed on both sides of the middle block, so as to divide the cylinder into a first pressurization chamber, a second pressurization chamber, a first drive chamber and a second drive chamber;

[0021] The switching valve in the first switching position delivers gas through its first gas outlet, and the switching valve in the second switching position delivers gas through its second gas outlet.

[0022] The triggering device includes two striking pins corresponding to the first piston and the second piston, a trigger valve core, and a first pilot control end and a second pilot control end corresponding to the two striking pins.

[0023] The two strikers respectively receive the impact of their corresponding pistons to drive the trigger valve core, thereby opening or closing the pilot control air path connected to the switching valve;

[0024] The first gas outlet is connected to the first driving chamber of the two driving chambers and the first pilot control end gas path;

[0025] The second gas outlet is connected to the second driving chamber and the second pilot control end gas path of the two driving chambers.

[0026] Optionally, the input terminal is connected to the gas input port of the switching valve and the second control gas path, respectively.

[0027] Optionally, the pneumatic booster further includes a gas check valve, wherein the gas check valve is disposed in the communication air passage between the input end and the output end, for unidirectionally discharging gas to the output end.

[0028] The technical solution of the above invention has the following advantages or beneficial effects:

[0029] The pneumatic booster provided in this embodiment of the invention is connected to a first pilot air path, a second pilot air path, and a pilot control air path via a pilot control valve. The first pilot air path is connected to the input end of the pneumatic booster, and the second pilot air path is connected to the output end of the pneumatic booster. During the delayed start-up phase of the pneumatic booster, because the pressure at the input end is greater than the pressure at the output end, the pressure difference between the first and second pilot air paths is large. The pilot control valve can cut off the pilot control air path based on this pressure difference, thereby preventing the switching valve connected to the pilot control air path from switching. Consequently, the piston of the booster unit cannot switch its direction of movement, thus achieving delayed start-up of the pneumatic booster and ensuring that the switching valve in the pneumatic booster does not switch during the delayed start-up phase. This avoids high-frequency switching during the start-up process, which helps improve the service life of the pneumatic booster. Furthermore, since the pneumatic booster does not switch during the delayed start-up phase, it reduces exhaust caused by switching. This reduces gas input, saves input flow, and thus saves costs. It also avoids ineffective work by the pneumatic booster. Attached Figure Description

[0030] Figure 1 This is a first pneumatic circuit diagram of a pneumatic booster including a delayed start device according to an embodiment of the present invention;

[0031] Figure 2 This is a schematic diagram comparing the switching frequencies of a pneumatic booster provided according to an embodiment of the present invention with those of an existing pneumatic booster;

[0032] Figure 3 This is a cross-sectional schematic diagram of the slide valve structure in the first state of the pneumatic booster provided according to an embodiment of the present invention;

[0033] Figure 4 This is a cross-sectional schematic diagram of the slide valve structure in the second state of the pneumatic booster provided according to an embodiment of the present invention;

[0034] Figure 5 This is a cross-sectional schematic diagram of the shut-off valve structure in a pneumatic booster provided according to an embodiment of the present invention;

[0035] Figure 6 This is a cross-sectional schematic diagram of the slide valve structure in the third state of the pneumatic booster provided according to an embodiment of the present invention.

[0036] The attached figures are labeled as follows:

[0037] 10-Input end; 11-Pressure regulating valve; 20-Boosting device; 21-Cylinder; 211-Intermediate block; 22-First piston; 22'-Second piston; 23-First boosting chamber; 24-Second boosting chamber; 25-First drive chamber; 26-Second drive chamber; 30-Output end; 40-Pilot control valve; 41-Valve core; 42-Spring; 43-Manual adjustment lever; 44-Guide groove; 50-First pilot air path; 60-Second pilot air path; 70-Pilot control air path; 71-First control air path; 72-Second control air path; 80-Switching valve; 81-First gas output port; 82-Second gas output port; 83-Gas input port; 84-First pilot control end; 85-Second pilot control end; 90-Trigger device; 91-First striking pin; 91'-Second striking pin;

[0038] 92-First pilot control terminal; 93-Second pilot control terminal; 94-First gas check valve; 95-Second gas check valve. Detailed Implementation

[0039] The gas path involved in the embodiments of the present invention is generally a gas passage used to directly or indirectly connect two components of a pneumatic supercharger. The gas passage directly connecting the two components of the pneumatic supercharger is generally always in a conductive state. The gas passage indirectly connecting the two components of the pneumatic supercharger generally refers to a gas passage with an intermediate component to control the opening or closing of the gas passage. For example, one pilot control gas path is a gas passage used to indirectly connect a switching valve and a triggering device, and this gas passage is equipped with a pilot control valve to control the opening or closing of the gas passage; another pilot gas path is a gas passage used to directly connect the input end and the pilot control valve, and it is always in a conductive state when the pneumatic supercharger is operating.

[0040] In the embodiments of this invention, the terms "first," "second," and "third," etc., are used to distinguish different structures or components or different positions of the same structure, and are not intended to limit the number or order of structures or components. For example, the first drive chamber and the second drive chamber in the embodiments of this invention are used to distinguish the drive chambers of the pneumatic booster located in different positions, and the first pilot control end and the second pilot control end are used to distinguish the two pilot control ends that switch the switching valve to different operating states, etc.

[0041] To address the problems of high-frequency switching during the startup phase of existing pneumatic boosters affecting their lifespan, as well as the loss of input flow and wasted work, embodiments of the present invention provide a delayed startup device and a pneumatic booster incorporating the delayed startup device. Wherein, Figure 1 This invention provides a first pneumatic circuit diagram of a pneumatic booster including a delayed start device according to an embodiment of the present invention. Figure 2A schematic diagram of the switching frequency of the pneumatic booster provided in an embodiment of the present invention is shown; Figure 3 A cross-sectional structural schematic diagram of the slide valve in the pneumatic booster provided in an embodiment of the present invention is shown. Figure 4 A cross-sectional structural schematic diagram of the slide valve in the pneumatic booster provided in an embodiment of the present invention is shown. Figure 5 A cross-sectional structural schematic diagram of the shut-off valve in the pneumatic booster provided in an embodiment of the present invention is shown; Figure 6 A cross-sectional structural diagram of the slide valve in the third state of the pneumatic booster provided in an embodiment of the present invention is shown. Figure 1 As shown, the delayed start device provided in this embodiment of the invention may include: a pilot control valve 40, a first pilot air path 50, and a second pilot air path 60; wherein, the pilot control valve 40 is connected to the first pilot air path 50, the second pilot air path 60, and the pilot control air path 70 of the switching valve 80 in the pneumatic booster; the first pilot air path 50 is connected to the input terminal 10 of the pneumatic booster, and the second pilot air path 60 is connected to the output terminal 30 of the pneumatic booster; the valve core 41 of the pilot control valve 40 moves according to the pressure difference between the first pilot air path 50 and the second pilot air path 60 to conduct or cut off the pilot control air path 70 connected to the pilot control valve 40; the pilot control air path 70 is used to control the switching valve 80 to switch when it is in the conducting state, so as to realize the switching of the movement direction of the switching valve 80.

[0042] In an optional embodiment of the present invention, the pilot control valve may be a two-position valve. Exemplarily, the pilot control valve 40 may be a shut-off valve, a spool valve, or a combination of both.

[0043] In another alternative embodiment of the invention, reference is made to... Figures 1-4 and Figure 6 The pilot control valve 40 includes a manual adjustment lever 43 and a guide groove 44. The manual adjustment lever 43 and the guide groove 44 are arranged axially along the valve core 41. The manual adjustment lever 43 is disposed in the guide groove 44. Under external pressure, the manual adjustment lever 43 moves towards the valve core 41 in the guide groove 44, abutting against the valve core 41 and pushing it to move, thereby resetting the pilot control valve 40. For example, when the delayed start device is applied to a pneumatic booster, and the pneumatic booster is stuck, the manual adjustment lever 43 of the pilot control valve 40 can be manually pressed to apply a driving force, causing the manual adjustment lever 43 to push the valve core 41 to move. This allows the pressure in the second control air passage 72 of the switching valve 80 to be emptied, and the valve core of the switching valve 80 to be switched to the bottom, thus resetting the pneumatic booster.

[0044] In a preferred embodiment of the present invention, if the pilot control valve is a two-position valve, then when the pressure difference between the first pilot air passage 50 and the second pilot air passage 60 is greater than a preset threshold, the valve core 41 of the pilot control valve 40 is driven by the pressure difference to remain in the first working position to cut off the pilot control air passage 70 connected to the pilot control valve 40; when the pressure difference between the first pilot air passage 50 and the second pilot air passage 60 is not greater than the preset threshold, the valve core 41 of the pilot control valve 40 is driven by the pressure difference to remain in the second working position to open the pilot control air passage 70 connected to the pilot control valve 40.

[0045] The following description uses a pneumatic booster including the aforementioned delayed start device as an example to illustrate the structure and operation of the delayed start device and pneumatic booster provided in this embodiment of the invention. (Continue reading...) Figure 1 The pneumatic booster may include: an input end 10 for introducing gas; a booster device 20 consisting of a cylinder 21 and two pistons 22, 22' linked by a piston rod; and an output end 30 for outputting the boosted gas; it also includes: a pilot control valve 40, a first pilot air passage 50, a second pilot air passage 60, a pilot control air passage 70, and a switching valve 80; wherein,

[0046] The pilot control valve 40 is connected to the first pilot air path 50, the second pilot air path 60 and the pilot control air path 70 respectively; the first pilot air path 50 is connected to the input terminal 10 and the second pilot air path 60 is connected to the output terminal 30.

[0047] The moving part 41 of the pilot control valve 40 moves according to the pressure difference between the first pilot air passage 50 and the second pilot air passage 60 to open or close the pilot control air passage 70 connected to the pilot control valve 40.

[0048] The pilot control air path 70 is connected to the switching valve 80. When the pilot control air path 70 is in the open state, the pilot control valve 40 controls the switching valve 80 to switch, thereby controlling the switching position of the switching valve 80, and the pneumatic booster will start working. Specifically, refer to... Figure 1The first control air path of the pilot control air path 70 is connected to the first pilot control terminal 84 of the switching valve 80. When the pilot control air path 70 is in the conducting state, it can control the pressure state of the first pilot control terminal 84 of the switching valve 80, thereby controlling the switching of the switching valve 80 to achieve the switching of the working position of the switching valve 80. Further, the second pilot control terminal 85 of the switching valve 80 is connected to the input terminal 10, so the pressure of the second pilot control terminal 85 is always the same as that of the input terminal 10. The pressure of the first pilot control terminal 84 is controlled by the pilot control air path 70, and the area of ​​the second pilot control terminal 85 is smaller than that of the first pilot control terminal 84. Therefore, based on the area difference between the first pilot control terminal 84 and the second pilot control terminal 85, the valve core of the switching valve 80 can be switched by changing the pressure of the first pilot control terminal 84, that is, the working position of the switching valve 80 can be switched.

[0049] In this embodiment of the invention, the pilot control valve 40 is connected to the first pilot air path 50, the second pilot air path 60 and the pilot control air path 70 respectively, and the first pilot air path 50 is connected to the input terminal 10 of the pneumatic booster, and the second pilot air path 60 is connected to the output terminal 30 of the pneumatic booster. During the delayed start-up phase of the pneumatic booster (before the pneumatic booster starts working), the pressure at the output end 30 is zero, which is lower than the pressure at the input end 10. That is, the pressure in the first pilot air path 50 is greater than the pressure in the second pilot air path 60. At this time, the pilot control valve 40 cuts off the pilot control air path 70 based on the pressure difference between the first pilot air path 50 and the second pilot air path 60. This prevents the switching valve 80 connected to the pilot control air path 70 from switching, and consequently prevents the piston in the booster device 20 from switching its direction of movement. This avoids the pneumatic booster from frequently switching and doing useless work during the delayed start-up phase. At this time, the gas at the input end 10 is directly output to the output end 30 through the first gas check valve 94 and the second gas check valve 95. As the pneumatic booster's delayed start-up phase progresses, the pressure at output end 30 gradually increases. When the pressure at output end 30 approaches the pressure at input end 10, that is, when the pressures of the second pilot air path 60 and the first pilot air path 50 are close, the pilot control valve 40 opens the pilot control air path 70. This allows the switching valve 80 to switch normally while the pilot control air path 70 is open, thereby achieving the switching of the piston's movement direction. In other words, the piston can reciprocate normally in the cylinder to achieve boosting, and the pneumatic booster begins to work, entering the normal boosting phase. During this process, the switching frequency diagram of the pneumatic booster can be shown as follows: Figure 2 As shown. By Figure 2It can be seen that, compared with the pneumatic booster without a delayed start device in the prior art, the pneumatic booster with a delayed start device provided in this embodiment of the invention has a significantly lower maximum switching frequency during the start-up process. At the same time, the working time t2 of the pneumatic booster with a delayed start device from the maximum switching frequency' to the average switching frequency is also significantly reduced compared with the working time t1 of the pneumatic booster without a delayed start device in the prior art. This is beneficial to improving the service life of the pneumatic booster.

[0050] The pilot control valve 40 can be implemented using a two-position valve. When the valve core 41 of the pilot control valve 40 is held in the first working position, the pilot control valve 40 cuts off the pilot control air path 70; when the valve core 41 of the pilot control valve 40 is held in the second working position, the pilot control valve 40 opens the pilot control air path 70.

[0051] The pilot control valve 40 can be a shut-off valve, a spool valve, or a combination of both. For example, such as... Figure 3 As shown, when the pilot control valve 40 is a spool valve, when the pneumatic booster 40 first enters the delayed start-up phase, the pressure at the output end 30 is zero, lower than the pressure at the input end 10, meaning the pressure in the second pilot air path 60 is zero, while the pressure in the first pilot air path 50 is the same as the pressure at the input end 10. Therefore, the valve core 41 of the pilot control valve 40, based on the pressure difference between the first pilot air path 50 and the second pilot air path 60, is subjected to a force in the first direction D1, thus compressing the spring 42 in the pilot control valve 40 and maintaining it in the first working position. In other words, when the pressure difference between the first pilot air path 50 and the second pilot air path 60 is greater than a preset threshold, the valve core 41 of the pilot control valve 40 remains in the first working position due to the large force in the first direction D1. In the first working position, the pilot control valve 40 cuts off the pilot control air path 70, so that the switching valve 80 cannot switch, and thus the piston in the booster device 20 cannot switch its direction of movement. This avoids the pneumatic booster from frequently switching and doing useless work during the delayed start-up phase. At this time, the gas at the input end 10 is directly output to the output end 30 through the first gas check valve 94 and the second gas check valve 95.

[0052] As the pneumatic booster continues to operate, the pressure in the second pilot air path 60 gradually increases, while the pressure in the first pilot air path 50 remains at the input pressure. Therefore, the pressures in the second pilot air path 60 and the first pilot air path 50 gradually converge, meaning the pressure difference between them gradually decreases. Consequently, the force exerted on the valve core 41 of the pilot control valve 40 in the first direction D1 also gradually decreases. When the pressure difference between the first pilot air path 50 and the second pilot air path 60 is not greater than a preset threshold, the force in the first direction D1 is less than the spring force of the spring 42. At this time, the valve core 41 slides in the opposite direction (second direction D2), switching from the first operating position to the second operating position. Figure 4 As shown. At this time, the pilot control air path 70 changes from the cut-off state to the open state, thereby enabling the switching valve 80 to switch normally, and thus allowing the piston 22 in the booster device 20 to reciprocate normally in the cylinder 21 to achieve boosting. Subsequently, as the pneumatic booster starts working and enters the normal boosting stage, the pressure at the output end 30 is greater than the pressure at the input end 10. Therefore, the pressure in the second pilot air path 60 is also greater than the pressure in the first pilot air path 50. This keeps the valve core 41 of the pilot control valve 40 in the second working position, thus ensuring that the pilot control air path 70 is always in the open state and does not affect the normal switching of the switching valve 80.

[0053] Alternatively, the pilot control valve 40 can also be a shut-off valve. In this embodiment of the invention, the switching principle of the shut-off valve and the spool valve is basically the same. Both are achieved by switching the valve core between the first pilot air path 50 and the second pilot air path 60 in a first working position and a second working position, so as to control the cut-off and opening of the pilot control air path 70. Figure 5 A schematic diagram of the shut-off valve in its first operating position is shown, as follows: Figure 5 As shown, due to the large pressure difference between the first pilot air path 50 and the second pilot air path 60 during the delayed start-up phase, the valve core 41 of the shut-off valve is subjected to a force in the first direction D1, thereby compressing the spring 42 to maintain the first working position. As the delayed start-up phase continues, the pressures of the first pilot air path 50 and the second pilot air path 60 gradually approach each other, and their pressure difference gradually decreases, allowing the valve core of the shut-off valve to move in the opposite direction to switch to the second working position (not shown in the figure). This allows the shut-off valve to open the pilot control air path 70, enabling the switching valve 80 to switch normally in the open state of the pilot control air path 70, thereby realizing the switching of the piston movement direction. That is, the piston can reciprocate normally in the cylinder to achieve pressurization, and the pneumatic booster starts to work, entering the normal pressurization phase from the delayed start-up phase.

[0054] It is understood that in this embodiment of the invention, the pilot control valve 40 can be any structure of a spool valve or a shut-off valve, or a combination of both. Furthermore, whether used alone or in combination, the critical switching pressures of the spool valve and the shut-off valve can be set according to actual needs. That is, the preset threshold corresponding to the pressure difference between the first pilot air path 50 and the second pilot air path 60 can be set according to actual needs, thereby achieving the control of the pilot control air path 70 to be cut off or opened at different critical switching pressures.

[0055] Additionally, in one embodiment of the present invention, reference is made to... Figure 1 , Figure 3 and Figure 6 The pilot control valve 40 also includes a manual adjustment lever 43 and a guide groove 44. The manual adjustment lever 43 and the guide groove are arranged axially along the valve core 41. The manual adjustment lever 43 is disposed in the guide groove 44. Driven by external pressure, the manual adjustment lever 43 moves towards the valve core 41 in the guide groove 44, abutting against the valve core 41 and pushing it to continue moving, thereby resetting the pilot control valve 40. Specifically, when the pneumatic booster is stuck, the manual adjustment lever 43 can be manually pressed to move it from the guide groove 44. Figure 3 Move towards direction D1 from the position shown, until... Figure 6 The position shown is in contact with the valve core 41. Continue pressing, and the manual adjustment lever 43 continues to move towards the D1 direction after contacting the valve core 41, thereby venting the pressure of the second control air circuit 72. Since the second control air circuit 72 is connected to the second pilot control end in the switching valve 80, when the pressure of the second control 72 is vented, the valve core of the switching valve 80 is also switched to the bottom, thereby realizing the reset of the pneumatic booster.

[0056] According to the embodiments of the present invention, the pneumatic booster is connected to a first pilot air path, a second pilot air path, and a pilot control air path via a pilot control valve. The first pilot air path is connected to the input end of the pneumatic booster, and the second pilot air path is connected to the output end of the pneumatic booster. During the delayed start-up phase of the pneumatic booster, since the pressure at the input end is greater than the pressure at the output end, the pressure difference between the first and second pilot air paths is large. The pilot control valve can cut off the pilot control air path based on this pressure difference, thereby preventing the switching valve connected to the pilot control air path from switching. Consequently, the piston of the booster unit cannot switch its direction of movement, thus avoiding high-frequency switching of the pneumatic booster during the start-up phase and improving the service life of the pneumatic booster. Furthermore, since the pneumatic booster does not switch during the delayed start-up phase, the exhaust caused by switching is reduced. This reduces gas input, saves input flow, and thus saves costs. It also avoids ineffective work by the pneumatic booster.

[0057] Continue to refer to Figure 1The pneumatic booster provided in this embodiment of the invention further includes: a triggering device 90; wherein, the pilot control air path 70 includes a first control air path 71 connected to the triggering device 90 and a second control air path 72 connected to the switching valve 80; the triggering device 90 is disposed in the cylinder 21, and when the triggering device 90 is impacted by the pistons 22, 22', it controls the switching valve 80 to switch through the first control air path 71 and the second control air path 72, so as to realize the switching of the movement direction of the piston 22.

[0058] The input terminal 10 is connected to the gas inlet 83 of the switching valve 80 and the second control gas path 72. It is understood that the triggering device can only control the switching valve 80 to switch via the first control gas path 71 and the second control gas path 72 when both are in the conducting state. In other words, when the pilot control valve 40 is in the first operating position, at least one of the first control gas path 71 and the second control gas path 72 remains in the cut-off state, thus preventing the switching valve from switching.

[0059] Specifically, in embodiments of the present invention, such as Figure 1 As shown, the piston includes a first piston 22 and a second piston 22' linked by a piston rod. A middle block 211 is provided in the middle region of the cylinder 21. The piston rod passes through the middle block 211, and the first piston 22 and the second piston 22' are respectively located on both sides of the middle block 211 to divide the cylinder 21 into a first pressurization chamber 23, a second pressurization chamber 24, a first drive chamber 25, and a second drive chamber 26.

[0060] The switching valve 80 in the first switching position delivers gas through its first gas outlet 81, and the switching valve 80 in the second switching position delivers gas through its second gas outlet 82.

[0061] The triggering device 90 includes two striking pins (first striking pin 91 and second striking pin 91') corresponding to the first piston 22 and the second piston 22', a trigger valve core (not shown in the figure), and a first pilot control terminal 92 and a second pilot control terminal 93 corresponding to the first striking pin 91 and the second striking pin 91', respectively.

[0062] The first striking pin 91 receives the impact of the first piston 22, and the second striking pin 91' receives the impact of the second piston 22', thereby driving the trigger valve core to open or close the pilot control air path 70 connected to the switching valve 80.

[0063] The first gas outlet 81 is connected to the first drive chamber 25 and the first pilot control terminal 92 via gas paths;

[0064] The second gas outlet 82 is connected to the second drive chamber 26 and the second pilot control terminal 93 via a gas path.

[0065] The first piston 22 and the second piston 22' being disposed inside the cylinder 21 generally means that the piston abuts against the inner wall of the cylinder 21, and the piston and the inner wall of the cylinder 21 form a sealing structure. This serves to create gas isolation between the first booster chamber 23 and the first drive chamber 25, and between the second booster chamber 24 and the second drive chamber 26, to prevent gas from the first booster chamber 23 from entering the first drive chamber 25 or gas from the second booster chamber 24 from entering the second drive chamber 26, thus ensuring that the pneumatic booster can work normally.

[0066] When gas is introduced into the first drive chamber 25, it drives the piston 22 adjacent to the first drive chamber 25 to move toward the first booster chamber 23. Correspondingly, the second drive chamber 26 is connected to the ambient atmosphere through a gas passage connected to the switching valve 80. The pressure in the second drive chamber 26 decreases, causing the piston 22' adjacent to the second drive chamber 26 to move toward the second drive chamber 26 (i.e., away from the second booster chamber 24).

[0067] When gas is introduced into the second drive chamber 26, the piston 22' adjacent to the second drive chamber 26 is driven to move toward the second booster chamber 24. Correspondingly, the first drive chamber 25 is connected to the ambient atmosphere through the gas passage connected to the switching valve 80. The pressure of the first drive chamber 25 decreases, causing the piston 22 adjacent to the first drive chamber 25 to move toward the first drive chamber 25 (i.e. away from the first booster chamber 23).

[0068] Among them, such as Figure 1 As shown, supplying gas through the first gas outlet 81 generally means that the switching valve 80 constructs a gas passage between the gas inlet 83 of the switching valve 80 and the first gas outlet 81, and supplies gas to one end of the trigger device 90 and the first drive chamber 25 connected to it through the first gas outlet 81. Correspondingly, the switching valve 80 constructs a gas passage between the exhaust port of the switching valve 80, which is connected to the environment, and the second gas outlet 82, and supplies gas to the other end of the trigger device 90 and the second drive chamber 26 connected to the ambient atmosphere through the second gas outlet 82.

[0069] In addition, supplying gas through the second gas outlet 82 generally means that the switching valve 80 constructs a gas passage between the gas inlet 83 of the switching valve 80 and the second gas outlet 82, and supplies gas to the other end of the trigger device 90 and the second drive chamber 26 connected to it through the second gas outlet 82. Correspondingly, the switching valve 80 constructs a gas passage between the exhaust port of the switching valve 80 that is connected to the environment and the first gas outlet 81, and constructs a connection between one end of the trigger device 90 connected to it and the first drive chamber 25 and the ambient atmosphere through the first gas outlet 81.

[0070] Among them, such as Figure 1 The triggering device 90 includes a first pilot control terminal 92 and a second drive chamber 26 located on the same side (i.e., the first pilot control terminal 92 and the second drive chamber 26 correspond to the same piston and the same pressurizing chamber). The triggering device 90 also includes a second pilot control terminal 93 and a first drive chamber 25 located on the same side (i.e., the second pilot control terminal 93 and the first drive chamber 25 correspond to the same piston and the same pressurizing chamber). However, the first pilot control terminal 92 and the second pilot control terminal 93 correspond to different pistons and different pressurizing chambers, respectively. Specifically, the first drive chamber 25 and the second pilot control terminal 93 are opposite to the same piston 22; the second drive chamber 26 and the first pilot control terminal 92 are opposite to another piston 22'.

[0071] In this process, after the striking pin is struck by its corresponding piston (e.g., the first striking pin 91 is struck by the first piston 22, or the second striking pin 91' is struck by the second piston 22'), the received driving force is transmitted to the trigger valve core, thereby driving the trigger valve core to move. During the start-up phase of the pneumatic booster, since the pilot control air path 70 is in a cut-off state, the piston's movement direction cannot be switched. Therefore, at most one striking pin 91 can be struck by the piston 22, and the trigger valve core can only move once at most according to the driving force, unable to move back and forth between the two switching positions, thus the switching valve cannot switch. Furthermore, to ensure that the pilot control air path 70 is in a cut-off state during startup, the starting position of the trigger valve core of the triggering device can be set to the working position of cutting off the pilot control air path. Therefore, during startup (before the pilot control air path is opened), the trigger valve core will not move.

[0072] It is worth mentioning that the embodiments of the present invention do not limit the deployment position of the delayed start device in the pneumatic booster. In fact, by placing the delayed start device in the pneumatic booster, with the first pilot control air path 50 connected to the input terminal 10 of the pneumatic booster and the second pilot control air path 60 connected to the output terminal 30 of the pneumatic booster, the delayed start of the pneumatic booster can be achieved. During the delayed start phase, the pilot control valve 40 moves according to the pressure difference between the first pilot air path 50 and the second pilot air path 60 to open or close the pilot control air path 70 connected to it, thereby controlling the switching valve 80. In other words, for triggering devices with different structures and delayed start devices at different positions in the pneumatic booster, the pneumatic booster provided in this embodiment of the invention can utilize the delayed start device to achieve delayed start of the booster. The pilot control valve 40, through its cooperation with the first pilot air path 50 and the second pilot air path 60, achieves state control (cut-off or opening) of the pilot control air path 70 of the triggering device 90, thereby avoiding high-frequency switching of the pneumatic booster during the start-up process.

[0073] During the delayed start-up process, the gas input at input terminal 10 is directly output to output terminal 30. In one embodiment of the present invention, to avoid gas backflow, a one-way gas valve is also provided in the gas path connecting input terminal 10 and output terminal 30 to direct the gas unidirectionally to output terminal 30. Specifically, as shown... Figure 1 As shown, the gas check valve includes two first gas check valves 94, which are disposed in the communication gas passage between the input end 10 and the first pressurization chamber 23 and the second pressurization chamber 24, for introducing input gas into the first pressurization chamber 23 and the second pressurization chamber 24. Further, refer to... Figure 1 The gas check valve may further include two second gas check valves 95, wherein the two second gas check valves 95 are disposed in the connecting gas path between the output end 30 and the first booster chamber 23 and the second booster chamber 24, for exporting the gas in the first booster chamber 23 and the second booster chamber 24 to the output end 30. During the delayed start-up phase of the pneumatic booster (before the booster starts working), since the first piston 22 and the second piston 22' do not switch their direction of movement, the gas input to the input end 10 flows through the gas path where the first gas check valve 94 is located, through the first booster chamber 23 and the second booster chamber 24, and then directly to the output end 30 through the gas path where the second gas check valve 95 is located. After the pressure difference between the first pilot air path 50 and the second pilot air path 60 is less than a preset threshold, the pneumatic booster starts to work and enters the boosting stage. At this time, the gas input at the input terminal 10 flows through the air path where the first gas check valve 94 is located to the first boosting chamber 23 and the second boosting chamber 24. After being boosted by the first boosting chamber 23 and the second boosting chamber 24, the boosted gas is then discharged through the air path where the second gas check valve 95 is located and discharged through the output terminal 30.

[0074] Furthermore, such as Figure 1 As shown, the above-mentioned pneumatic booster may further include a pressure regulating valve 11 disposed between the gas inlet 83 and the input end 10 of the switching valve 80. The pressure regulating valve 11 regulates the gas input to the first booster chamber 23 and the second booster chamber 24 to satisfy the need for regulating the input gas pressure, and by regulating the input gas pressure, the output gas pressure is adjusted.

[0075] According to the embodiments of the present invention, the pneumatic booster is connected to a first pilot air path, a second pilot air path, and a pilot control air path via a pilot control valve. The first pilot air path is connected to the input end of the pneumatic booster, and the second pilot air path is connected to the output end of the pneumatic booster. During the delayed start-up phase of the pneumatic booster, since the pressure at the input end is greater than the pressure at the output end, the pressure difference between the first and second pilot air paths is large. The pilot control valve can cut off the pilot control air path based on this pressure difference, thereby preventing the switching valve connected to the pilot control air path from switching. Consequently, the piston of the booster unit cannot switch its direction of movement, thus avoiding high-frequency switching of the pneumatic booster during the start-up phase and improving the service life of the pneumatic booster. Furthermore, since the pneumatic booster does not switch during the start-up phase, the exhaust caused by switching is reduced. This reduces gas input, saves input flow, and thus saves costs. It also avoids ineffective work by the pneumatic booster.

[0076] The above embodiments are provided only to help understand the structure and core ideas of the present invention. Those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims.

Claims

1. A delayed start device, characterized in that, include: Pilot control valve (40), first pilot air path (50), and second pilot air path (60); wherein, The pilot control valve (40) is connected to the first pilot air path (50), the second pilot air path (60), and the pilot control air path (70) of the switching valve (80) in the pneumatic booster, respectively; the first pilot air path (50) is connected to the input end (10) of the pneumatic booster, and the second pilot air path (60) is connected to the output end (30) of the pneumatic booster; the input end (10) is also connected to the gas inlet (83) of the switching valve (80) and the second pilot control end (85) of the switching valve (80), respectively; the first control air path of the pilot control air path (70) is connected to the first pilot control end (84) of the switching valve (80); During the delayed start-up phase of the pneumatic booster, the pressure at the output end (30) is lower than the pressure at the input end (10). The valve core (41) of the pilot control valve (40) moves according to the pressure difference between the first pilot air path (50) and the second pilot air path (60) to cut off the pilot control air path (70) connected to the pilot control valve (40), so that the switching valve (80) cannot switch. When the pressure at the output end (30) is close to the pressure at the input end (10), the valve core (41) of the pilot control valve (40) moves according to the pressure difference between the first pilot air path (50) and the second pilot air path (60) to open the pilot control air path (70) connected to the pilot control valve (40). The pilot control air path (70) is used to control the switching valve (80) to switch in the open state, so as to realize the switching of the working position of the switching valve (80).

2. The delayed start device according to claim 1, characterized in that, The pilot control valve (40) is a shut-off valve, a spool valve, or a combination of both.

3. The delayed start device according to claim 1 or 2, characterized in that, The pilot control valve (40) is a two-position valve.

4. The delayed start device according to claim 3, characterized in that, When the pressure difference between the first pilot air path (50) and the second pilot air path (60) is greater than a preset threshold, the valve core (41) of the pilot control valve (40) is driven by the pressure difference to remain in the first working position to cut off the pilot control air path (70) connected to the pilot control valve (40). When the pressure difference between the first pilot air path (50) and the second pilot air path (60) is not greater than a preset threshold, the valve core (41) of the pilot control valve (40) is driven by the pressure difference to remain in the second working position so as to open the pilot control air path (70) connected by the pilot control valve (40).

5. The delayed start device according to claim 1, characterized in that, The pilot control valve (40) includes: a manual adjustment lever (43) and a guide groove (44); wherein, The manual adjustment lever (43) and the guide groove (44) are arranged along the axial direction of the valve core (41). The manual adjustment lever (43) is arranged in the guide groove (44). Under the drive of external force, the manual adjustment lever (43) moves toward the valve core (41) in the guide groove (44) to abut against the valve core (41) and push the valve core (41) to move, so that the pilot control valve (40) is reset.

6. A pneumatic booster, characterized in that, include: The delayed start device, pilot control air circuit (70), switching valve (80), input end (10) for introducing gas, and pressurizing device (20) composed of cylinder (21) and first piston (22) and second piston (22') linked by piston rod, as described in any one of claims 1-5, and output end (30) for outputting pressurized gas; wherein, The pilot control valve (40) is connected to the first pilot air path (50), the second pilot air path (60) and the pilot control air path (70) respectively; the first pilot air path (50) is connected to the input terminal (10) and the second pilot air path (60) is connected to the output terminal (30); During the delayed start-up phase of the pneumatic booster, when the pressure at the output end (30) is lower than the pressure at the input end (10), the valve core (41) of the pilot control valve (40) moves according to the pressure difference between the first pilot air path (50) and the second pilot air path (60) to cut off the pilot control air path (70) connected to the pilot control valve (40), preventing the switching valve (80) from switching. When the pressure at the output end (30) is close to the pressure at the input end (10), the valve core (41) of the pilot control valve (40) moves according to the pressure difference between the first pilot air path (50) and the second pilot air path (60) to open the pilot control air path (70) connected to the pilot control valve (40). The pilot control air path (70) is connected to the switching valve (80) and is used to control the switching valve (80) to switch in the on state, so as to realize the switching of the working position of the switching valve (80).

7. The pneumatic booster according to claim 6, characterized in that, Also includes: Triggering device (90); wherein, The pilot control air path (70) includes a first control air path (71) connected to the triggering device (90) and a second control air path (72) connected to the switching valve (80). The triggering device (90) is disposed in the cylinder (21). When the triggering device (90) is struck by the piston (22, 22'), it controls the switching valve (80) to switch through the first control air passage (71) and the second control air passage (72) to realize the switching of the movement direction of the piston (22, 22').

8. The pneumatic booster according to claim 7, Its characteristics are: The cylinder (21) has a middle block (211) in the middle region. The piston rod passes through the intermediate block (211), and the first piston (22) and the second piston (22') are respectively disposed on both sides of the intermediate block (211) to divide the cylinder (21) into a first booster chamber (23), a second booster chamber (24), a first drive chamber (25) and a second drive chamber (26). The switching valve (80) in the first switching position delivers gas through its first gas outlet (81), and the switching valve (80) in the second switching position delivers gas through its second gas outlet (82). The triggering device (90) includes two striking pins (91, 91') corresponding to the first piston (22) and the second piston (22'), a trigger valve core, and a first pilot control terminal (92) and a second pilot control terminal (93) corresponding to the two striking pins (91, 91'). The two strikers (91, 91') respectively receive the impact of their corresponding pistons (22, 22') to drive the trigger valve core to open or close the pilot control air path (70) connected to the switching valve (80). The first gas outlet (81) is connected to the first drive chamber (25) and the first pilot control terminal (92) via gas path; The second gas outlet (82) is connected to the second drive chamber (26) and the second pilot control terminal (93) via gas path.

9. The pneumatic booster according to any one of claims 6-8, characterized in that, Also includes: Gas check valves (94, 95), wherein, The gas check valve (94, 95) is disposed in the gas passage between the input end (10) and the output end (30) for unidirectionally discharging gas to the output end (30).

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