CN116771748A - Delay starting device and pneumatic booster - Google Patents

Abstract

The invention discloses a delay starting device and a pneumatic booster. The delay start device includes: the device comprises a pilot control valve, a first pilot gas circuit and a second pilot gas circuit; the pilot control valve is respectively connected with the first pilot gas circuit, the second pilot gas circuit and the pilot control gas circuit of the switching valve in the pneumatic booster; the first pilot gas circuit is communicated with the input end of the pneumatic booster, and the second pilot gas circuit is communicated with the output end of the pneumatic booster; the valve core of the pilot control valve moves according to the pressure difference between the first pilot gas circuit and the second pilot gas circuit to switch on or switch off the pilot control gas circuit connected with the pilot control valve; the pilot control gas circuit is used for controlling the switching valve to switch under the conducting state so as to realize the switching of the working position of the switching valve. The delay starting device can avoid high-frequency switching of the pneumatic booster in the starting stage, improve the service life of the pneumatic booster, reduce idle work of the pneumatic booster and save input flow.

Description

Delay starting device and pneumatic booster

Technical Field

The invention relates to the technical field of pressurization, in particular to a delay starting device and a pneumatic booster.

Background

The working principle of the pneumatic booster is as follows: the output continues to increase in pneumatic pressure by the reciprocating piston movement until the target output pressure is reached. The pneumatic booster generally controls the reciprocating motion of the piston through the switching function of the switching valve, so that the gas in the booster chamber is output, and the effect of increasing the output gas pressure is achieved.

In the starting stage of the pneumatic booster, the pressure difference between the output end and the input end is large, so that the flow passing through the pneumatic booster is also large, the working frequency in the pneumatic booster is high, and the service life of the pneumatic booster can be reduced in the working process of high-frequency switching. And in the starting process, part of input gas is discharged by the pneumatic booster, so that the loss of input flow is caused, and the work of high-frequency switching of the booster is wasted.

Disclosure of Invention

In view of the above, the present invention provides a delayed start device and a pneumatic booster, which are applied to the pneumatic booster, and which realize delayed start of the pneumatic booster, and which can prevent a switching valve in the pneumatic booster from switching during the delayed start phase. The high-frequency switching of the pneumatic booster in the starting process is avoided, so that the service life of the pneumatic booster is prolonged. In addition, the pneumatic booster is not switched in the delayed starting stage, so that exhaust caused by switching is reduced, gas input is reduced, input flow is saved, cost is saved, and ineffective work of the pneumatic booster is avoided.

In order to solve the above technical problem, a first aspect of the present invention provides a delayed start device, including: the device comprises a pilot control valve, a first pilot gas circuit and a second pilot gas circuit; wherein,,

the pilot control valve is respectively connected with the first pilot gas circuit, the second pilot gas circuit and the pilot control gas circuit of the switching valve in the pneumatic booster; the first pilot gas circuit is communicated with the input end of the pneumatic booster, and the second pilot gas circuit is communicated with the output end of the pneumatic booster;

the valve core of the pilot control valve moves according to the pressure difference between the first pilot gas circuit and the second pilot gas circuit so as to switch on or switch off the pilot control gas circuit connected with the pilot control valve; the pilot control gas circuit is used for controlling the switching valve to switch under the conducting state so as to realize the switching of the working position of the switching valve.

Optionally, the pilot control valve is a shut-off valve, a spool valve, or a valve combining the two.

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

Optionally, under the condition that the pressure difference between the first pilot gas path and the second pilot gas path is greater than a preset threshold value, the valve core of the pilot control valve is driven by the pressure difference to be kept at a first working position so as to cut off the pilot control gas path communicated with the pilot control valve;

and under the condition that the pressure difference between the first pilot gas path and the second pilot gas path is not greater than a preset threshold value, the valve core of the pilot control valve is driven by the pressure difference to be kept at a second working position so as to conduct the pilot control gas path communicated with the pilot control valve.

Optionally, the pilot control valve includes: a hand adjusting rod and a guide groove; the pilot control valve comprises a pilot control valve, a pilot control valve body, a pilot adjusting rod, a guide groove, a pilot adjusting rod and a guide groove, wherein the pilot adjusting rod and the guide groove are arranged along the axial direction of the valve core, the pilot adjusting rod is arranged in the guide groove, and moves towards the valve core in the guide groove under the drive of external pressure so as to push the valve core to move after being abutted with the valve core, so that the pilot control valve is reset.

In order to solve the above technical problem, a second aspect of the present invention provides a pneumatic booster, comprising: any one of the delay starting device, the pilot control gas circuit, the switching valve and the input end for introducing gas provided in the first aspect, wherein the supercharging device consists of a cylinder barrel and two pistons linked through a piston rod and is used for outputting the output end of the supercharged gas; wherein,,

the pilot control valve is respectively connected with the first pilot gas circuit, the second pilot gas circuit and the pilot control gas circuit; the first pilot gas circuit is communicated with the input end, and the second pilot gas circuit is communicated with the output end;

the valve core of the pilot control valve moves according to the pressure difference between the first pilot gas circuit and the second pilot gas circuit so as to switch on or switch off the pilot control gas circuit connected with the pilot control valve;

the pilot control gas circuit is connected with the switching valve and is used for controlling the switching valve to switch under a conducting state so as to realize the switching of the working position of the switching valve.

Optionally, the pneumatic booster further comprises: a triggering device; wherein,,

the pilot control gas circuit comprises a first control gas circuit connected with the trigger device and a second control gas circuit connected with the switching valve;

the trigger device is arranged in the cylinder barrel, and when the trigger device is impacted by the piston, the first control gas circuit and the second control gas circuit control the switching valve to switch so as to realize the switching of the movement direction of the piston.

Optionally, the piston comprises a first piston and a second piston linked by a piston rod; a middle block is arranged in the middle area of the cylinder barrel; the piston rod passes through the middle block, and the first piston and the second piston are respectively arranged at two sides of the middle block so as to divide the cylinder barrel into a first pressurizing chamber, a second pressurizing chamber, a first driving chamber and a second driving chamber;

the switching valve in the first switching position conveys gas through the first gas output port included therein, and the switching valve in the second switching position conveys gas through the second gas output port included therein;

the trigger device comprises two firing pins respectively 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 respectively corresponding to the two firing pins;

the two firing pins respectively receive the impact of the corresponding pistons and are used for driving the trigger valve core to switch on or switch off a pilot control gas circuit communicated with the switching valve;

the first gas output port is in gas circuit communication with a first driving chamber of the two driving chambers and the first pilot control end;

the second gas output port is in gas circuit communication with a second driving chamber of the two driving chambers and the second pilot control end.

Optionally, the input end is connected with the gas input port of the switching valve and the second control gas path respectively.

Optionally, the pneumatic booster further comprises: the gas check valve is arranged in a communication gas path between the input end and the output end and is used for guiding out gas to the output end in a one-way mode.

The technical scheme of the invention has the following advantages or beneficial effects:

the pneumatic booster provided by the embodiment of the invention is respectively connected with the first pilot gas circuit, the second pilot gas circuit and the pilot control gas circuit through the pilot control valve, the first pilot gas circuit is communicated with the input end of the pneumatic booster, and the second pilot gas circuit is communicated with the output end of the pneumatic booster. In the delayed starting stage of the pneumatic booster, as the pressure of the input end is larger than that of the output end, the pressure difference between the first pilot gas path and the second pilot gas path is larger, and the pilot control valve can cut off the pilot control gas path according to the pressure difference, so that the switching valve connected with the pilot control gas path cannot be switched, and further the piston of the booster unit cannot switch the moving direction of the piston, thereby realizing the delayed starting of the pneumatic booster, and enabling the switching valve in the pneumatic booster not to be switched in the delayed starting stage. The high-frequency switching of the pneumatic booster in the starting process is avoided, so that the service life of the pneumatic booster is prolonged. In addition, the pneumatic booster is not switched in the delayed starting stage, so that exhaust caused by switching is reduced, gas input is reduced, input flow is saved, cost is saved, and ineffective work of the pneumatic booster is avoided.

Drawings

FIG. 1 is a first air circuit diagram of a pneumatic booster including a delayed start device provided in accordance with an embodiment of the present invention;

FIG. 2 is a schematic diagram showing a comparison of switching frequency between a pneumatic booster and an existing pneumatic booster according to an embodiment of the present invention;

FIG. 3 is a schematic cross-sectional view of a spool valve configuration in a first state in a pneumatic booster provided in accordance with an embodiment of the present invention;

FIG. 4 is a schematic cross-sectional view of a spool valve configuration in a second state in a pneumatic booster provided in accordance with an embodiment of the present invention;

FIG. 5 is a schematic cross-sectional view of a shut-off valve structure in a pneumatic booster provided in accordance with an embodiment of the present invention;

fig. 6 is a schematic cross-sectional view of a third state spool valve structure in a pneumatic booster according to an embodiment of the present invention.

The reference numerals are as follows:

10-input terminal; 11-a pressure regulating valve; 20-supercharging device; 21-a cylinder; 211-middle block; 22-a first piston; 22' -a second piston; 23-a first plenum chamber; 24-a second plenum chamber; 25-a first drive chamber; 26-a second drive chamber; 30-an output; 40-pilot control valve; 41-valve core; 42-springs; 43-hand adjusting rod; 44-guide grooves; 50-a first pilot gas circuit; 60-a second pilot line; 70-a pilot control gas circuit; 71-a first control air path; 72-a second control gas circuit; 80-switching valve; 81-a first gas outlet; 82-a second gas outlet; 83-a gas entry port; 84-a first pilot control terminal; 85-a second pilot control terminal; 90-triggering means; 91-a first striker; 91' -second striker;

92-a first pilot control terminal; 93-a second pilot control terminal; 94-a first gas check valve; 95-a second gas one-way valve.

Detailed Description

The gas path according to the embodiment of the invention is generally a gas path for directly or indirectly connecting two components of the pneumatic booster, wherein the gas path for directly connecting the two components of the pneumatic booster is generally always in a conducting state, and the gas path for indirectly connecting the two components of the pneumatic booster is generally that an intermediate component is further arranged on the gas path to control the on or off of the gas path, for example, a pilot control gas path is a gas path for indirectly connecting a switching valve and a triggering device, and a pilot control valve is arranged on the gas path to control the on or off of the gas path; the other pilot gas path is a gas channel for directly connecting the input end with the pilot control valve, and is always in a conducting state under the condition that the pneumatic booster works.

The "first", "second", "third", and the like in the embodiments of the present invention are for distinguishing between different structures or components or between different positions of the same structure, and are not intended to limit the number, order, or the like of structures or components. For example, the first driving chamber and the second driving chamber according to the embodiment of the present invention are used to distinguish driving chambers of pneumatic boosters at different positions, and the first pilot control end and the second pilot control end are used to distinguish two pilot control ends that make the switching valve switch different working states.

In order to solve the problems that the service life is influenced by high-frequency switching of the existing pneumatic booster in the starting stage, input flow is lost and work is not effective, the embodiment of the invention provides a delay starting device and the pneumatic booster comprising the delay starting device. Fig. 1 shows a first air circuit diagram of a pneumatic booster including a delayed start device according to an embodiment of the present invention; fig. 2 shows a schematic diagram of switching frequency of a pneumatic booster according to an embodiment of the present invention; FIG. 3 is a schematic cross-sectional view showing a first state of a spool valve in a pneumatic booster according to an embodiment of the present invention; FIG. 4 is a schematic cross-sectional view showing a second state of a spool valve in a pneumatic booster according to an embodiment of the present invention; FIG. 5 is a schematic cross-sectional view of a stop valve in a pneumatic booster according to an embodiment of the present invention; fig. 6 is a schematic cross-sectional view showing a third state of a spool valve in a pneumatic booster according to an embodiment of the present invention. As shown in fig. 1, the delay start device provided in the embodiment of the present invention may include: a pilot control valve 40, a first pilot gas path 50, a second pilot gas path 60; the pilot control valve 40 is respectively connected with the first pilot gas circuit 50, the second pilot gas circuit 60 and the pilot control gas circuit 70 of the switching valve 80 in the pneumatic booster; the first pilot gas circuit 50 is communicated with the input end 10 of the pneumatic booster, and the second pilot gas circuit 60 is communicated with the output end 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 gas path 50 and the second pilot gas path 60 to switch on or off the pilot control gas path 70 connected with the pilot control valve 40; the pilot control air path 70 is used for controlling the switching valve 80 to switch under a conducting state so as to switch the movement direction of the switching valve 80.

In an alternative embodiment of the invention, the pilot control valve may be a two-position valve. The pilot control valve 40 may be, for example, a shut-off valve, a spool valve, or a valve combining both structures.

In another alternative embodiment of the present invention, referring to fig. 1-4 and 6, the pilot control valve 40 includes: a manual lever 43 and a guide groove 44; wherein, the manual lever 43 and the guide groove 44 are arranged along the axial direction of the valve core 41, the manual lever 43 is arranged in the guide groove 44, the manual lever 43 moves towards the valve core 41 in the guide groove 44 under the drive of external pressure so as to push the valve core 41 to move after being abutted with the valve core 41, and the pilot control valve 40 is reset. For example, when the delay starting device is applied to the pneumatic booster and the pneumatic booster is in a stuck state, the manual lever 43 of the pilot control valve 40 can be manually pressed to apply a driving force to the manual lever 43, so that the manual lever 43 pushes the valve core 41 to move, and the pressure of the second control air path 72 of the switching valve 80 can be exhausted, the valve core of the switching valve 80 is switched to the bottom, and the resetting of the pneumatic booster is realized.

In a preferred embodiment of the present invention, if the pilot control valve is a two-position valve, in the case that the pressure difference between the first pilot gas path 50 and the second pilot gas path 60 is greater than a preset threshold value, the valve core 41 of the pilot control valve 40 is driven by the pressure difference to be kept at the first working position so as to cut off the pilot control gas path 70 communicated with the pilot control valve 40; when the pressure difference between the first pilot gas path 50 and the second pilot gas path 60 is not greater than the preset threshold, the valve element 41 of the pilot control valve 40 is driven by the pressure difference to be kept at the second working position, so as to conduct the pilot control gas path 70 communicated with the pilot control valve 40.

The structure and the working process of the delayed start device and the pneumatic booster provided by the embodiment of the invention are described below by taking the pneumatic booster including the delayed start device as an example. With continued reference to FIG. 1, the pneumatic booster may include: an input 10 for introducing gas, a pressurizing device 20 consisting of a cylinder 21 and two pistons 22, 22' linked by a piston rod, an output 30 for outputting the pressurized gas; further comprises: the pilot control valve 40, the first pilot gas path 50, the second pilot gas path 60, the pilot control gas path 70 and the switching valve 80; wherein,,

the pilot control valve 40 is respectively connected with the first pilot gas circuit 50, the second pilot gas circuit 60 and the pilot control gas circuit 70; the first pilot gas circuit 50 is communicated with the input end 10, and the second pilot gas circuit 60 is communicated with the output end 30;

the moving part 41 of the pilot control valve 40 moves according to the pressure difference between the first pilot gas path 50 and the second pilot gas path 60 to turn on or off the pilot control gas path 70 connected to the pilot control valve 40;

the pilot control air path 70 is connected to the switching valve 80, and when the pilot control air path 70 is in a conducting state, the pilot control valve 40 controls the switching valve 80 to switch, so as to control the switching of the working position of the switching valve 80, and the pneumatic booster starts to work. Specifically, referring to fig. 1, 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, and the pilot control air path 70 can control the pressure state of the first pilot control end 84 of the switching valve 80 in the conducting state, so as to control the switching of the switching valve 80, so as to realize the switching of the working position of the switching valve 80. Further, the second pilot control end 85 of the switching valve 80 is in communication with the input end 10, so that the pressure of the second pilot control end 85 is always the same as the input end 10, while the pressure of the first pilot control end 84 is controlled by the pilot control air path 70, and the area of the second pilot control end 85 is smaller than that of the first pilot control end 84, so that the valve core switching of the switching valve 80 can be controlled by changing the pressure of the first pilot control end 84 based on the area difference between the first pilot control end 84 and the second pilot control end 85, i.e. the switching of the operating position of the switching valve 80 is realized.

In the embodiment of the present invention, the first pilot gas path 50, the second pilot gas path 60 and the pilot control gas path 70 are respectively connected through the pilot control valve 40, the first pilot gas path 50 is communicated with the input end 10 of the pneumatic booster, and the second pilot gas path 60 is communicated with the output end 30 of the pneumatic booster. In the delayed starting stage of the pneumatic booster (the pneumatic booster does not start to work), the pressure of the output end 30 is zero and lower than the pressure of the input end 10, that is, the pressure of the first pilot gas path 50 is greater than the pressure of the second pilot gas path 60, at this time, the pilot control valve 40 cuts off the pilot control gas path 70 according to the pressure difference between the first pilot gas path 50 and the second pilot gas path 60, so that the switching valve 80 connected with the pilot control gas path 70 cannot be switched, and further, the piston in the booster device 20 cannot switch the movement direction, thereby avoiding frequent switching of the pneumatic booster to do idle work in the delayed starting stage, and at this time, the gas of the input end 10 is directly output to the output end 30 through the first gas one-way valve 94 and the second gas one-way valve 95. Along with the progress of the delayed start stage of the pneumatic booster, the pressure of the output end 30 gradually rises, when the pressure of the output end 30 is close to the pressure of the input end 10, that is, when the pressures of the second pilot gas path 60 and the first pilot gas path 50 are close, the pilot control valve 40 conducts the pilot control gas path 70, so that the switching valve 80 can be switched normally in the conducting state of the pilot control gas path 70, and further the switching of the movement direction of the piston is realized, that is, the piston can normally reciprocate in the cylinder barrel to realize boosting, and the pneumatic booster starts to work and enters the normal boosting stage. In this process, a schematic diagram of the switching frequency of the pneumatic booster can be shown in fig. 2. As can be seen from fig. 2, compared with the prior art in which the pneumatic booster does not include the delayed start device, the maximum switching frequency of the pneumatic booster including the delayed start device in the start process provided by the embodiment of the invention is significantly reduced, and meanwhile, the operating time t2 from the maximum switching frequency' to the average switching frequency of the pneumatic booster including the delayed start device is also significantly reduced compared with the operating time t1 from the maximum switching frequency to the average switching frequency of the pneumatic booster not including the delayed start device in the prior art, thereby being beneficial to improving the service life of the pneumatic booster.

The pilot control valve 40 may be realized by a two-position valve. When the spool 41 of the pilot control valve 40 is maintained in the first operating position, the pilot control valve 40 shuts off the pilot control gas path 70; when the spool 41 of the pilot control valve 40 is maintained in the second operating position, the pilot control valve 40 turns on the pilot control air passage 70.

The pilot control valve 40 may be a shut-off valve, a spool valve, or a combination of both. Illustratively, as shown in fig. 3, in the case where the pilot control valve 40 is a spool valve, the pressure of the output port 30 is zero, lower than the pressure of the input port 10, that is, the pressure of the second pilot gas passage 60 is zero, and the pressure of the first pilot gas passage 50 is the pressure of the input port 10 when the pneumatic booster 40 is just started to enter the delayed start stage, so that the spool 41 of the pilot control valve 40 receives a force in the first direction D1 according to the pressure difference between the first pilot gas passage 50 and the second pilot gas passage 60, and thus compresses the spring 42 in the pilot control valve 40 to be maintained in the first operating position. That is, in the case where the pressure difference between the first pilot gas passage 50 and the second pilot gas passage 60 is greater than the preset threshold value, the spool 41 of the pilot control valve 40 is always maintained at the first operation 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 be switched, and further, the piston in the supercharging device 20 cannot be switched in the moving direction, thereby avoiding frequent switching of the pneumatic supercharger to do idle work in the delayed starting stage, and the air at the input end 10 is directly output to the output end 30 through the first air one-way valve 94 and the second air one-way valve 95.

As the pneumatic booster continues to start, the pressure of the second pilot gas path 60 gradually increases, and the pressure of the first pilot gas path 50 is still the input end pressure, so the pressures of the second pilot gas path 60 and the first pilot gas path 50 gradually approach, that is, the pressure difference between the first pilot gas path 50 and the second pilot gas path 60 gradually decreases, and then the valve core 41 of the pilot control valve 40 is also gradually decreased by the force in the first direction D1. When the pressure difference between the first pilot gas path 50 and the second pilot gas path 60 is not greater than the preset threshold, the force in the first direction D1 is smaller than the elastic force of the spring 42, and at this time, the valve element 41 slides in the opposite direction (the second direction D2) of the first direction, and is switched from the first working position to the second working position, as shown in fig. 4. At this time, the pilot control air path 70 is changed from the cut-off state to the on state, so that the switching valve 80 can be switched normally, and the piston 22 in the supercharging device 20 can reciprocate normally in the cylinder 21 to realize supercharging. Thereafter, since the pneumatic booster starts to operate to enter the normal boosting stage, the pressure of the output end 30 is greater than the pressure of the input end 10, and then the pressure of the second pilot gas path 60 is also greater than the pressure of the first pilot gas path 50, which keeps the spool 41 of the pilot control valve 40 at the second operating position all the time, thereby keeping the pilot control gas path 70 in the on state all the time without affecting the normal switching of the switching valve 80.

The pilot control valve 40 may be a shutoff valve. In the embodiment of the present invention, the switching principle of the stop valve and the slide valve is basically the same, and the valve core in the first working position and the second working position is switched by the pressure difference between the first pilot gas path 50 and the second pilot gas path 60, so as to control the cutting off and the switching on of the pilot control gas path 70. Fig. 5 shows a schematic view of the shut-off valve in the first operating position, as shown in fig. 5, since the pressure difference between the first pilot gas path 50 and the second pilot gas path 60 is large in the delayed start stage, the spool 41 of the shut-off valve receives a force in the first direction D1, so that the compression spring 42 is maintained in the first operating position. Along with the duration of the delayed start phase, the pressure of the first pilot gas circuit 50 and the pressure of the second pilot gas circuit 60 gradually approach, and the pressure difference gradually decreases, so that the valve core of the stop valve can move reversely to switch to a second working position (not shown in the figure), so that the stop valve conducts the pilot control gas circuit 70, the switching valve 80 can switch normally under the conducting state of the pilot control gas circuit 70, and further the switching of the movement direction of the piston is realized, that is, the piston can reciprocate normally in the cylinder barrel to realize supercharging, and the pneumatic supercharger starts working, and enters the normal supercharging phase from the delayed start phase.

It will be appreciated that in the present embodiment, the pilot control valve 40 may be either a spool valve or a shut-off valve, or a combination of both. And, whether used alone or in combination, the critical switching pressures of the spool valve and the shut-off valve may be set according to actual needs. That is, the preset threshold corresponding to the pressure difference between the first pilot gas circuit 50 and the second pilot gas circuit 60 can be set according to the actual requirement, so as to control the pilot control gas circuit 70 to be turned off or turned on at different critical switching pressures.

In addition, in one embodiment of the present invention, referring to fig. 1, 3 and 6, the pilot control valve 40 further includes a manual lever 43 and a guide groove 44; the manual adjustment lever 43 and the guide groove are disposed along the axial direction of the valve core 41, the manual adjustment lever 43 is disposed in the guide groove 44, and the manual adjustment lever 43 can move towards the valve core 41 in the guide groove 44 under the driving of external pressure so as to push the valve core 41 to move continuously after being abutted with the valve core 41, and then the pilot control valve 40 is reset. Specifically, when the air supercharger is in the locked state, the manual lever 43 may be moved in the direction D1 from the position shown in fig. 3 in the guide groove 44 by manually pressing the manual lever 43 until the position shown in fig. 6 abuts against the valve spool 41, further pressing is continued, the manual lever 43 abuts against the valve spool 41 and then continues to move in the direction D1, thereby evacuating the pressure of the second control air passage 72, and since the second control air passage 72 is connected to the second pilot control end in the switching valve 80, the valve spool of the switching valve 80 is also switched to the bottom when the pressure of the second control 72 is evacuated, thereby realizing the resetting of the air supercharger.

According to the pneumatic booster provided by the embodiment of the invention, the first pilot gas circuit is respectively connected with the first pilot gas circuit, the second pilot gas circuit and the pilot control gas circuit through the pilot control valve, the first pilot gas circuit is communicated with the input end of the pneumatic booster, and the second pilot gas circuit is communicated with the output end of the pneumatic booster. In the delay starting stage of the pneumatic booster, as the pressure of the input end is larger than that of the output end, the pressure difference between the first pilot gas path and the second pilot gas path is larger, and the pilot control valve can cut off the pilot control gas path according to the pressure difference, so that the switching valve connected with the pilot control gas path cannot be switched, and further the piston of the booster unit cannot switch the movement direction of the piston, thereby avoiding high-frequency switching of the pneumatic booster in the starting stage, and being beneficial to improving the service life of the pneumatic booster. In addition, the pneumatic booster is not switched in the delayed starting stage, so that exhaust caused by switching is reduced, gas input is reduced, input flow is saved, cost is saved, and ineffective work of the pneumatic booster is avoided.

With continued reference to fig. 1, the pneumatic booster provided by the embodiment of the present invention further includes: a triggering device 90; wherein, the pilot control air circuit 70 comprises a first control air circuit 71 connected with the triggering device 90 and a second control air circuit 72 connected with the switching valve 80; the trigger device 90 is disposed in the cylinder 21, and when the trigger device 90 is impacted by the pistons 22, 22', the first control air path 71 and the second control air path 72 control the switching valve 80 to switch, so as to switch the movement direction of the piston 22.

The input end 10 is connected to the gas input port 83 of the switching valve 80 and the second control gas path 72, respectively. It can be understood that, in the case where the first control air path 71 and the second control air path 72 are both in the on state, the trigger device can control the switching valve 80 to switch through the first control air path 71 and the second control air path 72. In other words, in the case where the pilot control valve 40 is maintained in the first operating position, at least one of the first control air path 71 and the second control air path 72 is maintained in the shut-off state, so that the switching valve cannot be switched.

Specifically, in the embodiment of the present invention, as shown in fig. 1, the piston includes a first piston 22 and a second piston 22 'linked by a piston rod, a middle block 211 is provided in a 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 separately provided at both sides of the middle block 211 to divide the cylinder 21 into a first pressurizing chamber 23, a second pressurizing chamber 24, a first driving chamber 25 and a second driving chamber 26;

the switching valve 80 in the first switching position delivers gas through a first gas outlet 81 comprised thereof and the switching valve 80 in the second switching position delivers gas through a second gas outlet 82 comprised thereof;

the trigger device 90 includes two striker rods (first striker rod 91 and second striker rod 91 ') corresponding to the first piston 22 and the second piston 22', respectively, a trigger spool (not shown in the figure), and a first pilot control end 92 and a second pilot control end 93 corresponding to the first striker rod 91 and the second striker rod 91', respectively;

the first striker 91 receives the impact of the first piston 22, and the second striker 91 'receives the impact of the second piston 22', thereby driving the trigger valve spool to turn on or off the pilot control air passage 70 through which the switching valve 80 communicates;

the first gas outlet 81 is in gas circuit communication with the first drive chamber 25 and the first pilot control end 92;

the second gas outlet 82 is in gas communication with the second drive chamber 26 and the second pilot control end 93.

The first piston 22 and the second piston 22' are disposed in the cylinder 21, which generally means that the pistons are abutted against the inner side wall of the cylinder 21, the pistons and the inner side wall of the cylinder 21 form a sealing structure, and a gas isolation purpose is formed between the first pressurizing chamber 23 and the first driving chamber 25, and between the second pressurizing chamber 24 and the second driving chamber 26, so that the gas of the first pressurizing chamber 23 is prevented from being strung into the first driving chamber 25 or the gas of the second pressurizing chamber 24 is prevented from strung into the second driving chamber 26, and the pneumatic booster can work normally.

Wherein the first driving chamber 25 drives the piston 22 adjacent to the first driving chamber 25 to move toward the first pressurizing chamber 23 when the gas is introduced. Accordingly, the second drive chamber 26 is vented to ambient atmosphere through a gas path connected to the switching valve 80, and the pressure in the second drive chamber 26 is reduced, causing the piston 22' adjacent to the second drive chamber 26 to move in the direction of the second drive chamber 26 (i.e., away from the second pumping chamber 24).

The second driving chamber 26 drives the piston 22' adjacent to the second driving chamber 26 to move towards the second pressurizing chamber 24 under the condition that the gas is introduced, and accordingly, the first driving chamber 25 is communicated with the ambient atmosphere through a gas path connected with the switching valve 80, and the pressure of the first driving chamber 25 is reduced, so that the piston 22 adjacent to the first driving chamber 25 moves towards the first driving chamber 25 (i.e. away from the first pressurizing chamber 23).

As shown in fig. 1, the gas delivery through the first gas outlet 81 generally means that the switching valve 80 constructs a gas path between the gas inlet 83 of the switching valve 80 and the first gas outlet 81, and the gas is input to one end of the trigger device 90 and the first driving chamber 25 connected thereto through the first gas outlet 81, and accordingly, the switching valve 80 constructs a gas path between the gas outlet 82 and the gas outlet 80, and the other end of the trigger device 90 connected thereto is connected to the second driving chamber 26 through the second gas outlet 82.

In addition, the gas is generally transferred through the second gas outlet 82, that is, the switching valve 80 constructs a gas path between the gas inlet 83 of the switching valve 80 and the second gas outlet 82, and the gas is transferred through the second gas outlet 82 to the other end of the trigger 90 connected thereto and the second driving chamber 26, and accordingly, the switching valve 80 constructs a gas path between the gas outlet 81 and the first gas outlet 81 of the switching valve 80, and the first gas outlet 81 constructs an end of the trigger 90 connected thereto and the first driving chamber 25 to communicate with the ambient atmosphere.

As shown in fig. 1, the trigger device 90 includes the first pilot control end 92 and the second driving chamber 26 located on the same side (i.e., the first pilot control end 92 and the second driving chamber 26 correspond to the same piston and the same pressurizing chamber), the trigger device 90 includes the second pilot control end 93 and the first driving chamber 25 located on the same side (i.e., the second pilot control end 93 and the first driving chamber 25 correspond to the same piston and the same pressurizing chamber), and the first pilot control end 92 and the second pilot control end 93 correspond to different pistons and different pressurizing chambers, respectively. Namely: the first drive chamber 25 and the second pilot control end 93 are opposite the same piston 22; the second drive chamber 26 and the first pilot control end 92 are opposite the other piston 22'.

After the striker is impacted by its corresponding piston (e.g., the first striker 91 is impacted by the first piston 22, or the second striker 91 'is impacted by the second piston 22'), the driving force received by the striker is transmitted to the trigger valve core to drive the trigger valve core to move. In the starting stage of the pneumatic booster, since the pilot control air passage 70 is in the cut-off state, the movement direction of the piston cannot be switched, and therefore, at most, only the one-side striker 91 can be impacted by the piston 22, and the trigger valve core also moves at most once according to the driving force and cannot move back and forth at two switching positions, and therefore, the switching valve cannot be switched. In addition, in order to ensure that the pilot control air passage 70 is in a shut-off state at the time of start, the start position of the trigger spool of the trigger device may be set to a working position where the pilot control air passage is shut off, whereby the trigger spool does not move during start-up (before the pilot control air passage is turned on).

It should be noted that the deployment position of the delayed-start device in the pneumatic booster is not limited in the embodiments of the present invention. In practice, by arranging the delayed start device in the pneumatic booster, the first pilot control air path 50 is communicated with the input end 10 of the pneumatic booster, and the second pilot control air path 60 is communicated with the output end 30 of the pneumatic booster, the delayed start of the pneumatic booster can be realized. In the delayed start phase, the pilot control valve 40 moves according to the pressure difference between the first pilot gas path 50 and the second pilot gas path 60 to turn on or off the pilot control gas path 70 connected thereto, thereby controlling the switching of the switching valve 80. That is, for the trigger devices with different structures and the delay starting devices at different positions in the pneumatic booster, the pneumatic booster provided by the embodiment of the invention can utilize the delay starting device to realize the delay starting of the booster, namely, the pilot control valve 40 is matched with the first pilot gas path 50 and the second pilot gas path 60 to realize the state control (cutting off or conducting) of the pilot control gas path 70 of the trigger device 90, so as to avoid the high-frequency switching of the pneumatic booster in the starting process.

During the delayed start-up, the gas input at input 10 is directly output to output 30. In one embodiment of the present invention, in order to avoid the backflow of the gas, a gas check valve is further provided on the communication gas path between the input end 10 and the output end 30 to guide the gas to the output end 30 in one direction. Specifically, as shown in fig. 1, the gas check valve includes two first gas check valves 94, wherein the two first gas check valves 94 are disposed in a communication path between the input end 10 and the first pressurizing chamber 23 and the second pressurizing chamber 24, for introducing the input gas into the first pressurizing chamber 23 and the second pressurizing chamber 24. Additionally, with continued reference to fig. 1, the gas check valve may further comprise: and two second gas check valves 95, wherein the two second gas check valves 95 are arranged in a communication gas path between the output end 30 and the first pressurizing chamber 23 and the second pressurizing chamber 24, and are used for guiding out the gas in the first pressurizing chamber 23 and the second pressurizing chamber 24 to the output end 30. In the delayed start phase of the pneumatic booster (the booster does not start to work), since the first piston 22 and the second piston 22' do not switch the movement direction, the gas input from the input end 10 flows through the first booster chamber 23 and the second booster chamber 24 via the gas path where the first gas check valve 94 is located, and then flows directly to the output end 30 via the gas path where the second gas check valve 95 is located. After the pressure difference between the first pilot gas path 50 and the second pilot gas path 60 is smaller than the preset threshold, the pneumatic booster starts to work and enters a boosting stage, at this time, the gas input by the input end 10 flows to the first boosting chamber 23 and the second boosting chamber 24 through the gas path where the first gas check valve 94 is located, is boosted by the first boosting chamber 23 and the second boosting chamber 24, and then the boosted gas is led out through the gas path where the second gas check valve 95 is located, and the boosted gas is led out through the output end 30.

Further, as shown in fig. 1, the above-mentioned pneumatic booster may further include: the pressure regulating valve 11 is provided between the gas input port 83 and the input port 10 of the switching valve 80. The pressure regulating valve 11 regulates and controls the gas input into the first pressurizing chamber 23 and the second pressurizing chamber 24 so as to meet the regulation and control of the pressure of the input gas, and the purpose of regulating the pressure of the output gas is achieved by regulating and controlling the pressure of the input gas.

According to the pneumatic booster provided by the embodiment of the invention, the first pilot gas circuit is respectively connected with the first pilot gas circuit, the second pilot gas circuit and the pilot control gas circuit through the pilot control valve, the first pilot gas circuit is communicated with the input end of the pneumatic booster, and the second pilot gas circuit is communicated with the output end of the pneumatic booster. In the delay starting stage of the pneumatic booster, as the pressure of the input end is larger than that of the output end, the pressure difference between the first pilot gas path and the second pilot gas path is larger, and the pilot control valve can cut off the pilot control gas path according to the pressure difference, so that the switching valve connected with the pilot control gas path cannot be switched, and further the piston of the booster unit cannot switch the movement direction of the piston, thereby avoiding high-frequency switching of the pneumatic booster in the starting stage, and being beneficial to improving the service life of the pneumatic booster. In addition, the pneumatic booster is not switched in the starting stage, so that exhaust caused by switching is reduced, gas input is reduced, input flow is saved, cost is saved, and ineffective work of the pneumatic booster is avoided.

The above description of the embodiments is provided only to assist in understanding the structure and core idea of the present invention. It will be apparent to those skilled in the art that various changes and modifications can be made to the present invention without departing from the principles of the invention, and such changes and modifications are intended to be included within the scope of the appended claims.

Claims (10)

1. A delayed activation device comprising: a pilot control valve (40), a first pilot gas path (50) and a second pilot gas path (60); wherein,,

the pilot control valve (40) is respectively connected with a first pilot gas circuit (50), a second pilot gas circuit (60) and a pilot control gas circuit (70) of a switching valve (80) in the pneumatic booster; the first pilot gas circuit (50) is communicated with the input end (10) of the pneumatic booster, and the second pilot gas circuit (60) is communicated with the output end (30) of the pneumatic booster;

a valve core (41) of the pilot control valve (40) moves according to the pressure difference between the first pilot gas channel (50) and the second pilot gas channel (60) so as to switch on or switch off a pilot control gas channel (70) connected with the pilot control valve (40); the pilot control gas circuit (70) is used for controlling the switching valve (80) to switch under the conducting state so as to realize the switching of the working position of the switching valve (80).

2. The delayed activation device of claim 1, wherein,

the pilot control valve (40) is a stop valve, a slide valve or a valve combining the two.

3. The delayed starting device of claim 1 or 2, wherein,

the pilot control valve (40) is a two-position valve.

4. A delayed start device as defined in claim 3, wherein,

when the pressure difference between the first pilot gas path (50) and the second pilot gas path (60) is larger than a preset threshold value, a valve core (41) of the pilot control valve (40) is driven by the pressure difference to be kept at a first working position so as to cut off a pilot control gas path (70) communicated with the pilot control valve (40);

when the pressure difference between the first pilot gas path (50) and the second pilot gas path (60) is not larger than a preset threshold value, the valve core (41) of the pilot control valve (40) is driven by the pressure difference to be kept at a second working position so as to conduct the pilot control gas path (70) communicated with the pilot control valve (40).

5. The delayed start device of claim 1, wherein the pilot control valve (40) comprises: a manual adjusting rod (43) and a guide groove (44); wherein,,

the manual adjusting rod (43) and the guide groove (44) are arranged along the axial direction of the valve core (41), the manual adjusting rod (43) is arranged in the guide groove (44), and the manual adjusting rod (43) moves towards the valve core (41) in the guide groove (44) under the driving of an external force so as to push the valve core (41) to move after being abutted with the valve core (41), so that the pilot control valve (40) is reset.

6. A pneumatic booster, comprising: the delayed start device, the pilot control gas circuit (70), the switching valve (80), the input end (10) for introducing gas, the supercharging device (20) consisting of a cylinder (21) and a first piston (22) and a second piston (22') linked by a piston rod, and the output end (30) for outputting the supercharged gas according to any one of claims 1 to 5; wherein,,

the pilot control valve (40) is respectively connected with the first pilot gas circuit (50), the second pilot gas circuit (60) and the pilot control gas circuit (70); the first pilot gas circuit (50) is communicated with the input end (10), and the second pilot gas circuit (60) is communicated with the output end (30);

a valve core (41) of the pilot control valve (40) moves according to the pressure difference between the first pilot gas channel (50) and the second pilot gas channel (60) so as to switch on or switch off a pilot control gas channel (70) connected with the pilot control valve (40);

the pilot control gas circuit (70) is connected with the switching valve (80) and is used for controlling the switching of the switching valve (80) in a conducting state so as to realize the switching of the working position of the switching valve (80).

7. The pneumatic booster of claim 6, further comprising: a trigger device (90); wherein,,

the pilot control gas circuit (70) comprises a first control gas circuit (71) connected with the trigger device (90) and a second control gas circuit (72) connected with the switching valve (80);

the trigger device (90) is arranged in the cylinder barrel (21), and when the trigger device (90) is impacted by the piston (22, 22 '), the switching valve (80) is controlled to be switched through the first control air passage (71) and the second control air passage (72) so as to realize the switching of the movement directions of the piston (22, 22').

8. The pneumatic booster of claim 7, wherein the pneumatic booster comprises a compressor;

an intermediate block (211) is arranged in the intermediate region of the cylinder barrel (21);

the piston rod passes through the middle block (211), and the first piston (22) and the second piston (22') are respectively arranged at two sides of the middle block (211) so as to divide the cylinder barrel (21) into a first pressurizing chamber (23), a second pressurizing chamber (24), a first driving chamber (25) and a second driving chamber (26);

the switching valve (80) in the first switching position delivers gas through a first gas outlet (81) comprised therein, and the switching valve (80) in the second switching position delivers gas through a second gas outlet (82) comprised therein;

the triggering device (90) comprises two firing pins (91, 91 ') corresponding to the first piston (22) and the second piston (22 '), respectively, a triggering valve core, and a first pilot control end (92) and a second pilot control end (93) corresponding to the two firing pins (91, 91 '), respectively;

the two firing pins (91, 91 ') respectively receive the impact of the corresponding pistons (22, 22') and are used for driving the trigger valve core to switch on or switch off a pilot control gas circuit (70) communicated with the switching valve (80);

the first gas outlet (81) is in gas circuit communication with the first driving chamber (25) and the first pilot control end (92);

the second gas outlet (82) is in gas path communication with the second drive chamber (26) and the second pilot control end (93).

9. A pneumatic booster according to claim 5 wherein,

the input end (10) is respectively connected with a gas input port (83) of the switching valve (80) and the second control gas circuit (72).

10. The pneumatic booster of claim 1, further comprising: a gas check valve (94, 95), wherein,

the gas check valves (94, 95) are arranged on a communication gas path between the input end (10) and the output end (30) and are used for guiding gas to the output end (30) in a one-way mode.