Double-channel vacuum generator

Abstract

The invention discloses a double-channel vacuum generator, which comprises a vacuum generator body integrated with at least one group of vacuum generation units and at least one working port corresponding to the vacuum generation units; the vacuum generation unit comprises a negative pressure generation component and a first control mechanism, the first control mechanism comprises a pneumatic control reversing valve A and a pilot valve A, the pneumatic control reversing valve A further comprises a valve rod, a pneumatic control cavity A and a balance cavity, and the pneumatic control cavity A and the balance cavity are matched with the valve rod; the pilot valve A is connected to a positive pressure air source and used for supplying compressed air of the positive pressure air source to the air control cavity A, the pilot valve A is provided with an exhaust port A, and the exhaust port A communicates with the balance cavity; the vacuum generator body is provided with a balance opening communicated with the atmosphere, and the balance cavity is communicated with the balance opening. The exhaust port A of the pilot valve A is communicated with the balance cavity of the pneumatic operated directional valve A. Exhaust of the pilot valve A is achieved through the balance cavity, the risk that foreign matter invades the pilot valve A is reduced, the overall operation stability of the vacuum generator is improved, and the service life of the vacuum generator is prolonged.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of vacuum generating devices, in particular to a double-channel vacuum generator. BACKGROUND

[0002] The vacuum generating device is a pneumatic element for generating negative pressure by compressed air. The core structure includes a nozzle, a receiving chamber, a diffusion chamber and a vacuum interface. During operation, compressed air is ejected at high speed through the nozzle, driving the surrounding air into the receiving chamber to form an air flow, thereby reducing the air pressure in the receiving chamber to generate negative pressure. Then the air flow enters the diffusion chamber, the speed slows down, the pressure rises, and finally is discharged from the exhaust port. The main function is to quickly build a vacuum environment, which is widely used in the field of automation, such as adsorbing and carrying light and thin workpieces (paper, plastic sheet), vacuum fixing workpieces, assisting pneumatic equipment exhaust, etc., with the advantages of small size, fast response and no need for motor drive.

[0003] In actual application, the core operation of adsorption and release of products of the vacuum generating device usually needs to rely on multiple control valves to achieve cooperation. In order to ensure the normal working condition and function switching of each control valve, the vacuum generating device body needs to be provided with exhaust holes corresponding to the number of control valves to balance the air pressure. However, in a specific use environment with high dust content, dust particles in the air are easy to enter the inner cavity of the control valve through these exhaust holes along with the air flow. With the passage of time, the invaded dust will gradually deposit in the control valve, which not only may cause wear of the internal components of the control valve, but also may interfere with the precise action of the control valve, resulting in a decrease in control sensitivity, a delay in response, and even a problem of control valve jamming and failure, thereby affecting the overall operation stability and service life of the vacuum generating device.

[0004] Therefore, it is necessary to improve the prior art. SUMMARY

[0005] The purpose of the present application is to overcome the defects and shortcomings of the prior art, and to provide a double-channel vacuum generator. The exhaust port A of the pilot valve A is communicated to the balance chamber of the pneumatic reversing valve A, and the exhaust of the pilot valve A is realized through the balance chamber, thereby reducing the risk of foreign matter invading the pilot valve A, improving the overall operation stability of the vacuum generator, and prolonging the service life of the vacuum generator.

[0006] To achieve the above purpose, the following technical solutions are adopted in the present application: A double-channel vacuum generator, comprising, a vacuum generator body integrated with at least one group of vacuum generating units and at least one working port corresponding to the vacuum generating units; The vacuum generating unit comprises: a negative pressure generating member for generating negative pressure under the action of compressed gas; A first control mechanism is arranged in cooperation with the working port and the negative pressure port of the negative pressure generating component, and the first control mechanism can at least control the on-off between the working port and the negative pressure port. The first control mechanism comprises a pneumatic reversing valve A and a pilot valve A. The pneumatic reversing valve A has at least a first gas port and a second gas port, the first gas port is in communication with the working port, and the second gas port is in communication with the negative pressure port. The pneumatic reversing valve A further comprises a valve rod, a pneumatic control cavity A and a balance cavity in cooperation with the valve rod, respectively, the compressed gas entering the pneumatic control cavity A can act on the valve rod to switch the air circuit of the pneumatic reversing valve A. The pilot valve A is connected to the positive pressure gas source for supplying the compressed gas of the positive pressure gas source to the pneumatic control cavity A, and the pilot valve A has an exhaust port A in communication with the balance cavity. The vacuum generator body has a balance port in communication with the atmosphere, and the balance cavity is in communication with the balance port.

[0007] Further, the pneumatic reversing valve A further has a third gas port in communication with the positive pressure gas source or in communication with the atmosphere, and the first gas port can be selectively in communication with the second gas port or in communication with the third gas port.

[0008] Further, the pneumatic reversing valve A has a first valve cavity, and the valve rod is movably arranged in the first valve cavity; the valve rod can move relative to the first valve cavity between a first position and a second position, when the compressed gas is supplied to the pneumatic control cavity A, the valve rod moves to the first position to make the first gas port in communication with the third gas port; when the compressed gas is discharged from the pneumatic control cavity A, the valve rod moves to the second position to make the first gas port in communication with the second gas port.

[0009] Further, a first piston is connected to a first end of the valve rod in cooperation, the first piston is in sliding cooperation with the peripheral side wall of the first valve cavity, the first piston separates the first valve cavity into a gas source cavity A, the pneumatic control cavity A and the balance cavity, the balance cavity is located between the gas source cavity A and the pneumatic control cavity A, along the sliding direction of the first piston, the first piston has opposite first and second end portions, the first end portion has a first end face, and the second end portion has a second end face, the first end face is located in the pneumatic control cavity A, and the second end face is located in the gas source cavity A, and the area of the first end face is greater than the area of the second end face.

[0010] Further, the second end of the valve rod is connected with a second piston, the air control reversing valve A has a first valve port for connecting the first air port and the second air port, and a second valve port for connecting the first air port and the third air port, when the valve rod is in the first position, the second piston blocks the first valve port and opens the second valve port; when the valve rod is in the second position, the second piston opens the first valve port and blocks the second valve port.

[0011] Further, the pilot valve A further has a gas source port A and a working port A, the gas source port A is connected with the positive pressure gas source, the working port A is connected with the air control cavity A, and the working port A can be selectively connected with the exhaust port A or the gas source port A.

[0012] Further, the vacuum generating unit further comprises a second control mechanism connected with the positive pressure gas source, for supplying the compressed gas of the positive pressure gas source to the negative pressure generating member.

[0013] Further, the second control mechanism comprises an air control reversing valve B and a pilot valve B, wherein, the air control reversing valve B has a fourth air port and a fifth air port, the fourth air port is connected with the positive pressure gas source, and the fifth air port is connected with the air inlet of the negative pressure generating member; the air control reversing valve B further has a piston B, a spring B and a working cavity B matched with the piston B, when the working cavity B is supplied with the compressed gas or when the working cavity B discharges the compressed gas, the piston B switches the air path of the air control reversing valve B; the pilot valve B has a gas source port B, a working port B and an exhaust port B, the gas source port B is connected with the positive pressure gas source, the working port B is connected with the working cavity B, and the exhaust port B is connected with the atmosphere; the working port B can be selectively connected with the gas source port B or the exhaust port B.

[0014] Further, the air control reversing valve B has a second valve cavity, the piston B divides the second valve cavity into a gas source cavity B and the working cavity B, the gas source cavity B is connected with the fourth air port, and the spring B is arranged between the piston B and the inner wall of the working cavity B; the piston B can move relative to the second valve cavity between a third position and a fourth position, when the working cavity B is supplied with the compressed gas, the compressed gas in the working cavity B and the spring B jointly drive the piston B to move to the third position, so as to disconnect the fifth air port and the fourth air port; when the working cavity B discharges the compressed gas, the compressed gas in the gas source cavity B drives the piston B to move to the fourth position, so as to connect the fifth air port and the fourth air port.

[0015] Further, the third gas port is connected with a pilot valve B, the pilot valve B has a first working state and a second working state, when the pilot valve B is in the first working state, the third gas port is in communication with the positive pressure gas source or the atmosphere, when the pilot valve B is in the second working state, the third gas port is disconnected from the positive pressure gas source or the atmosphere.

[0016] After adopting the above structure, the application has the following beneficial effects: (1) The double-channel vacuum generator has the exhaust port A of the pilot valve A connected to the balance cavity of the pneumatic reversing valve A, so that the exhaust of the pilot valve A is realized through the balance cavity, the risk of foreign matter invading the pilot valve A is reduced, the operation stability of the whole vacuum generator is improved, and the service life of the vacuum generator is prolonged.

[0017] (2) The double-channel vacuum generator adopts integrated design, integrates two groups of vacuum generating units in the vacuum generator body structure, and simultaneously realizes precise and independent function control of the two groups of vacuum generating units through independent control logic design, so that the separate adsorption and carrying of two workpieces are realized. The application not only significantly optimizes the overall layout of the vacuum generator, effectively reduces the structure volume, and greatly reduces the installation space occupancy rate, but also reduces the number of parts used through integrated integration, realizes double optimization from the aspects of structure simplification and material cost. Under the current development trend of continuous improvement of the demand for small-sized layout and low-cost control of industrial equipment, the compactness, space utilization rate and cost economy of the vacuum generator of the application are more prominent. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the specific embodiments of the present application, the drawings needed in the description of the specific embodiments will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0019] Figure 1 is a schematic diagram of the overall structure of the present application; Figure 2 is an exploded view of the overall structure of the present application; Figure 3 is a cross-sectional view of the overall structure of the present application Figure 1 ; Figure 4 is an enlarged schematic diagram of the structure at A of the present application Figure 3 ; Figure 5 is a cross-sectional view of the overall structure of the present application Figure 2 ; Figure 6 is a structure enlarged schematic view of B of the present application Figure 5 Figure 7 is a whole structure sectional view of the present application Figure 3 ; Figure 8 is a structure enlarged schematic view of C of the present application Figure 7 Figure 9 is a gas circuit principle diagram of the present application.

[0020] Figures 1 to 9 Reference signs in the drawings are as follows: 1, vacuum generator body; 11, working port; 12, balance port; 2, negative pressure generating component; 21, negative pressure port; 22, air inlet; 3, air control reversing valve A; 31, first air port; 32, second air port; 33, third air port; 34, valve rod; 341, first piston; 342, second piston; 35, first valve cavity; 351, air control cavity A; 352, balance cavity; 353, air source cavity A; 36, first valve port; 37, second valve port; 4, pilot valve A; 41, exhaust port A; 42, air source port A; 43, working port A; 5, air control reversing valve B; 51, fourth air port; 52, fifth air port; 53, piston B; 54, spring B; 55, second valve cavity; 551, working cavity B; 552, air source cavity B; 6, pilot valve B; 61, air source port B; 62, working port B; 63, exhaust port B; 7, pilot valve B; 8, pressure gauge; 9, silencer. DETAILED DESCRIPTION

[0021] In order to make the above objectives, features and advantages of the present application more apparent, specific embodiments of the present application are described in detail below with reference to the accompanying drawings. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. However, the present application can be practiced in a number of different manners beyond the specific embodiments described herein, and it is understood that similar modifications of this nature can be made by those skilled in the art, without departing from the spirit of the application, and therefore the present application is not limited to the specific embodiments disclosed below.

[0022] In the description of the present application, it should be understood that if these terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.​​

[0023] In addition, the terms "first", "second", and the like, if any, are used herein for descriptive purposes only and should not be construed as indicating or implying relative importance or identifying the number of the indicated technical characteristics. Thus, a feature with the "first" or "second" limitation can explicitly or implicitly include at least one such feature. In the description of the present application, if the term "plurality" appears, the meaning of the term "plurality" is at least two, such as two, three, etc., unless otherwise explicitly specified and limited.

[0024] In the present application, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connecting", "fixing" and the like appear, these terms should be interpreted broadly. For example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0025] In the present application, unless otherwise explicitly specified and limited, if the first feature is described as "on" or "under" the second feature, etc., it can mean that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be the first feature directly above or obliquely above the second feature, or it can only mean that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be the first feature directly below or obliquely below the second feature, or it can only mean that the first feature is lower than the second feature in horizontal height.

[0026] It should be noted that if an element is referred to as "fixed to" or "provided on" another element, it can be directly on another element or there can be a middle element. If an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. If present, the terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used in the present application are only for illustrative purposes and do not represent the only implementation.

[0027] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[0028] As Figures 1 to 9As shown, a double-channel vacuum generator comprises a vacuum generator body 1, which is integrated with at least one set of vacuum generating units and at least one working port 11 corresponding to the vacuum generating units; the vacuum generating units comprise: a negative pressure generating component 2 for generating negative pressure under the action of compressed gas; a first control mechanism is arranged in cooperation with the working port 11 and a negative pressure port 21 of the negative pressure generating component 2, and the first control mechanism can at least control the on-off between the working port 11 and the negative pressure port 21; the first control mechanism comprises an air control reversing valve A3 and a pilot valve A4, wherein the air control reversing valve A3 has at least a first gas port 31 and a second gas port 32, the first gas port 31 is in communication with the working port 11, and the second gas port 32 is in communication with the negative pressure port 21; the air control reversing valve A3 further comprises a valve rod 34, an air control cavity A351 and a balance cavity 352 which are arranged in cooperation with the valve rod 34, compressed gas entering the air control cavity A351 can act on the valve rod 34 to make the valve rod 34 switch the air path of the air control reversing valve A3; the pilot valve A4 is connected to a positive pressure gas source for supplying compressed gas of the positive pressure gas source to the air control cavity A351, the pilot valve A4 has an exhaust port A41, and the exhaust port A41 is in communication with the balance cavity 352; the vacuum generator body 1 has a balance port 12 in communication with the atmosphere, and the balance cavity 352 is in communication with the balance port 12.

[0029] Based on the above embodiment, the double-channel vacuum generator is provided, the exhaust port A41 of the pilot valve A4 is communicated to the balance cavity 352 of the air control reversing valve A3, the exhaust of the pilot valve A4 is realized through the balance cavity 352, the risk of foreign matter invading the pilot valve A4 is reduced, the operation stability of the whole vacuum generator is improved, and the service life of the vacuum generator is prolonged.

[0030] As another preferred scheme of the present application, the air control reversing valve A3 further has a third air port 33, which is communicated with a positive pressure gas source or with the atmosphere, and the first air port 31 can be selectively communicated with the second air port 32 or with the third air port 33. The pilot valve A4 further has a gas source port A42, which is communicated with a positive pressure gas source, and a working port A43, which is communicated with the air control cavity A351, and the working port A43 can be selectively communicated with an exhaust port A41 or with the gas source port A42. The control valve A is an electromagnetic valve, and when the control valve A is de-energized, the working port A43 is communicated with the gas source port A42; and when the control valve A is energized, the working port A43 is communicated with the exhaust port A41. The air control reversing valve A3 has a first valve cavity 35, in which the valve rod 34 is movably arranged; the valve rod 34 can be moved relative to the first valve cavity 35 between a first position and a second position, and when the air control cavity A351 is supplied with compressed gas, the valve rod 34 is moved to the first position to make the first air port 31 communicated with the third air port 33; and when the air control cavity A351 is exhausted with compressed gas, the valve rod 34 is moved to the second position to make the first air port 31 communicated with the second air port 32. The first end of the valve rod 34 is connected with a first piston 341 in a fit manner, the first piston 341 is slidably fitted with the peripheral side wall of the first valve cavity 35, and the first piston 341 separates the first valve cavity 35 into a gas source cavity A353, the air control cavity A351 and a balance cavity 352, the balance cavity 352 is located between the gas source cavity A353 and the air control cavity A351, and along the sliding direction of the first piston 341, the first piston 341 has opposite first and second end portions, the first end portion has a first end face, and the second end portion has a second end face, the first end face is located in the air control cavity A351, and the second end face is located in the gas source cavity A353, and the area of the first end face is greater than the area of the second end face. The second end of the valve rod 34 is connected with a second piston 342 in a fit manner, and the air control reversing valve A3 has a first valve port 36 for communicating the first air port 31 and the second air port 32, and a second valve port 37 for communicating the first air port 31 and the third air port 33, when the valve rod 34 is located in the first position, the second piston 342 blocks the first valve port 36 and opens the second valve port 37; and when the valve rod 34 is located in the second position, the second piston 342 opens the first valve port 36 and blocks the second valve port 37.

[0031] In the present embodiment, as shown in Figure 3 , Figure 4 and Figure 9As shown, when the pilot valve A4 is de-energized, the working port A43 is in communication with the gas source port A42, and the positive pressure gas flows into the gas control cavity A351 from the gas source port A42 and the working port A43. Since the area of the first piston 341 at the first end of the valve rod 34 on the first end face of the gas control cavity A351 is larger than the area of the first piston 341 on the second end face of the gas source cavity A353, the gas pressure difference causes the valve rod 34 to move to the first position, and the gas in the balance cavity 352 is discharged from the balance port 12. At this time, the second piston 342 at the second end of the valve rod 34 opens the second valve port 37, and the first gas port 31 is in communication with the third gas port 33. The compressed gas or the atmosphere flows into the working port 11 from the third gas port 33 and the first gas port 31 to perform the breaking vacuum; when the pilot valve A4 is energized, the working port A43 is in communication with the exhaust port A41. Since the gas source cavity A353 is always in communication with the positive pressure gas source, the valve rod 34 moves from the first position to the second position, and the gas in the gas control cavity A351 flows through the working port A43 and the exhaust port A41 into the balance cavity 352, and is finally discharged from the balance port 12. At this time, the second piston 342 opens the first valve port 36, and the first gas port 31 is in communication with the second gas port 32. The negative pressure gas flows into the working port 11 from the negative pressure port 21 of the negative pressure generating member 2, the second gas port 32 and the first gas port 31 to perform the adsorption operation. In a further preferred embodiment, the balance port 12 and / or the exhaust port B63 is provided with a filter device (not shown in the figure). The filter device can play a barrier role to block the invasion of dust and other impurities in the external environment into the pilot valve A4 and / or the pilot valve B6. In a further embodiment, the filter device can be a brass particle sintered filter sheet, which is a porous filter element made of brass particles as raw material and formed by molding and high temperature sintering. The brass material gives the filter sheet excellent corrosion resistance, thermal conductivity and mechanical strength, which can adapt to complex working conditions such as humidity and high temperature, and has a long service life; the three-dimensional interconnected porous structure formed by sintering has uniform pore distribution and controllable pore size, which can not only filter foreign matter in the gas flow, but also ensure smooth gas flow, reduce gas flow resistance and avoid significant impact on the working efficiency of the pneumatic system; at the same time, the metal properties of brass particles make them have good high temperature resistance and impact resistance, and they are not easy to be damaged due to vibration or temperature change, and have a solid structure without the risk of falling off, combining the filtering effect and structural stability.

[0032] As another preferred scheme of the present application, the vacuum generating unit further comprises a second control mechanism connected to the positive pressure gas source for supplying compressed gas of the positive pressure gas source to the negative pressure generating member 2. The second control mechanism comprises a pneumatic reversing valve B5 and a pilot valve B6, wherein the pneumatic reversing valve B5 has a fourth gas port 51 and a fifth gas port 52, the fourth gas port 51 being in communication with the positive pressure gas source, and the fifth gas port 52 being in communication with the gas inlet port 22 of the negative pressure generating member 2; the pneumatic reversing valve B5 further has a piston B53, a spring B54 and a working cavity B551 cooperating with the piston B53, when compressed gas is supplied to the working cavity B551, or when compressed gas is discharged from the working cavity B551, the piston B53 switches the gas path of the pneumatic reversing valve B5; the pilot valve B6 has a gas source port B61, a working port B62 and a discharge port B63, the gas source port B61 being in communication with the positive pressure gas source, the working port B62 being in communication with the working cavity B551, and the discharge port B63 being in communication with the atmosphere; the working port B62 can be selectively in communication with the gas source port B61 or the discharge port B63. The pilot valve B6 is a solenoid valve, when the pilot valve B6 loses power, the working port B62 is in communication with the discharge port B63; when the pilot valve B6 is powered, the working port B62 is in communication with the gas source port B61. The pneumatic reversing valve B5 has a second valve cavity 55, the piston B53 divides the second valve cavity 55 into a gas source cavity B552 and the working cavity B551, the gas source cavity B552 is in communication with the fourth gas port 51, and the spring B54 abuts against the inner wall of the working cavity B551; the piston B53 can move relative to the second valve cavity 55 between a third position and a fourth position, when compressed gas is supplied to the working cavity B551, the compressed gas in the working cavity B551 and the spring B54 jointly drive the piston B53 to move to the third position, so as to disconnect the fifth gas port 52 from the fourth gas port 51; when compressed gas is discharged from the working cavity B551, the compressed gas in the gas source cavity B552 drives the piston B53 to move to the fourth position, so as to connect the fifth gas port 52 to the fourth gas port 51. The spring B54 makes the piston B53 always have a tendency to move to the third position.

[0033] In the present embodiment, as shown in Figure 5 , Figure 6 and Figure 9As shown, when the pilot valve B6 is de-energized, the working port B62 is communicated with the exhaust port B63, and further makes the working cavity B551 communicated with the atmosphere. Since the gas source cavity B552 is always communicated with the positive pressure gas source, the piston B53 is moved to the fourth position under the pressure of the positive pressure gas source to overcome the elastic force of the spring B54, and makes the fifth gas port 52 communicated with the fourth gas port 51. The positive pressure gas enters the gas inlet 22 of the negative pressure generating component 2 through the fourth gas port 51 and the fifth gas port 52, and the negative pressure generating component 2 can generate negative pressure gas. When the pilot valve B6 is energized, the working port B62 is communicated with the gas source port B61, and the positive pressure gas enters the working cavity B551 through the gas source port B61 and the working port B62. Although the working cavity B551 and the gas source cavity B552 are both communicated with the positive pressure gas, the piston B53 is moved from the fourth position to the third position under the elastic force of the spring B54, and makes the fifth gas port 52 disconnected with the fourth gas port 51, and further makes the gas inlet 22 of the negative pressure generating component 2 disconnected with the positive pressure gas source.

[0034] As another preferred scheme of the present application, the third gas port 33 is connected with a pilot valve B7, and the pilot valve B7 has a first working state and a second working state. When the pilot valve B7 is in the first working state, the third gas port 33 is communicated with the positive pressure gas source or the atmosphere. When the pilot valve B7 is in the second working state, the third gas port 33 is disconnected with the positive pressure gas source or the atmosphere. In the present embodiment, as shown in FIG. 2, the pilot valve B7 is connected with the third gas port 33, and the third gas port 33 is communicated with the positive pressure gas source or the atmosphere when the pilot valve B7 is in the first working state. Figure 9As shown, in the present embodiment, the pressure maintaining energy saving function of the vacuum generator is realized by the setting of the pilot valve B7. Specifically, when the working port 11 needs negative pressure gas, the valve rod 34 moves to the second position, i.e. the first gas port 31 is in communication with the second gas port 32; at this time, the pilot valve B7 is in the second working state, i.e. the third gas port 33 is disconnected from the positive pressure gas source, at this time, the negative pressure gas enters the working port 11 through the second gas port 32, the first valve port 36 and the first gas port 31 for adsorption operation. When the working port 11 needs to maintain negative pressure gas, the valve rod 34 moves to the first position, i.e. the first gas port 31 is in communication with the third gas port 33; the pilot valve B7 is in the second working state, i.e. the third gas port 33 is disconnected from the positive pressure gas source, at this time, the working port 11 is always maintained within the set vacuum degree range; when the vacuum degree at the working port 11 is lower than the set value, the valve rod 34 moves to the second position, i.e. the first gas port 31 is in communication with the second gas port 32, so that the negative pressure gas enters the working port 11 again through the second gas port 32, the first valve port 36 and the first gas port 31, when the vacuum degree at the working port 11 reaches the set value, the valve rod 34 moves to the first position again, i.e. the first gas port 31 is in communication with the third gas port 33. When the working port 11 needs to break the vacuum, the valve rod 34 moves to the first position, i.e. the first gas port 31 is in communication with the third gas port 33; the pilot valve B7 is in the first working state, i.e. the third gas port 33 is in communication with the positive pressure gas source, at this time, the positive pressure gas enters the working port 11 through the third gas port 33, the second valve port 37 and the first gas port 31 for breaking the vacuum.

[0035] As another preferred embodiment of the present application, the negative pressure generating member 2 is connected with a silencer 9. In the present embodiment, as shown in Figure 5 and Figure 9 shown, the gas is discharged after noise reduction by the silencer 9, which can effectively reduce noise pollution.

[0036] As another preferred embodiment of the present application, the vacuum generator body 1 is integrated with two groups of the vacuum generating units and two working ports 11, and the vacuum generating units and the working ports 11 are one-to-one corresponding. In the present embodiment, integrated design is adopted, i.e. two groups of vacuum generating units are integrated in the structure of the vacuum generator body 1, and through independent control logic design, it is ensured that the two groups of vacuum generating units can realize precise and independent function control, so as to realize the separate adsorption and carrying of two workpieces. The present application not only significantly optimizes the overall layout of the vacuum generator, effectively reduces the structure volume and greatly reduces the installation space occupancy, but also reduces the number of parts through integrated integration, so as to realize double optimization from the aspects of structure simplification and material cost. Under the current development trend of continuous improvement of the demand for small size layout and low cost control of industrial equipment, the compactness, space utilization and cost economy of the vacuum generator of the present application are more prominent.

[0037] As another preferred embodiment of the present application, the first gas port 31 of the air control reversing valve A3 is connected with a pressure gauge 8. In the present embodiment, as shown in Figure 2 and Figure 9 the core function of the pressure gauge 8 arranged at the first gas port 31 of the air control reversing valve A3 is to detect the vacuum degree parameter of the first gas port 31 in real time and accurately. On the one hand, it can be directly judged whether the vacuum degree meets the working requirements of the downstream vacuum executing element, such as vacuum chuck, vacuum clamp, etc., so as to avoid the decline of adsorption force, the falling of workpiece or the deviation of positioning caused by insufficient vacuum degree, or the unnecessary energy waste caused by too high vacuum degree. On the other hand, when the vacuum degree of the equipment is abnormal, such as sudden drop or too large fluctuation, the pressure gauge 8 can feedback abnormal signal in time to help the operator quickly locate the fault source and shorten the troubleshooting and maintenance time. Meanwhile, during the equipment debugging or daily maintenance stage, the pressure gauge 8 can also be used as an intuitive basis for vacuum degree calibration to ensure that the vacuum degree of the first gas port 31 of the air control reversing valve A3 is always stable in a reasonable range, thereby guaranteeing the operation reliability and production continuity of the entire vacuum generator.

[0038] Obviously, the above embodiments are only examples for clearly illustrating but not limiting the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, it is not necessary and also impossible to enumerate all the embodiments. The obvious changes or variations derived therefrom are still within the protection scope of the present application.

Claims

1. A dual-channel vacuum generator, characterized in that, include, The vacuum generator body integrates at least one set of vacuum generating units and at least one working port corresponding to the vacuum generating units; The vacuum generating unit includes: A negative pressure generating component is used to generate negative pressure under the action of compressed gas; A first control mechanism is configured to cooperate with the working port and the negative pressure port of the negative pressure generating component. The first control mechanism is at least capable of controlling the on / off connection between the working port and the negative pressure port. The first control mechanism includes a pneumatically controlled directional valve A and a pilot valve A, wherein, The pneumatically controlled reversing valve A has at least a first air port and a second air port, the first air port being connected to the working port and the second air port being connected to the negative pressure port; The pneumatically controlled reversing valve A further includes a valve stem, a pneumatically controlled chamber A and a balance chamber that cooperate with the valve stem respectively. The compressed gas entering the pneumatically controlled chamber A can act on the valve stem, so that the valve stem switches the air path of the pneumatically controlled reversing valve A. The pilot valve A is connected to a positive pressure gas source and is used to supply compressed gas from the positive pressure gas source to the pneumatic control chamber A. The pilot valve A has an exhaust port A, which is connected to the balance chamber. The vacuum generator body has a balance port that communicates with the atmosphere, and the balance chamber is connected to the balance port.

2. A dual-channel vacuum generator according to claim 1, characterized in that: The pneumatically controlled reversing valve A also has a third air port, which is connected to a positive pressure air source or to the atmosphere. The first air port can be selectively connected to a second air port or to the third air port.

3. A dual-channel vacuum generator according to claim 2, characterized in that: The pneumatically controlled directional valve A has a first valve chamber, and the valve stem is movably disposed within the first valve chamber. The valve stem is movable relative to the first valve chamber between a first position and a second position. When compressed gas is supplied to the pneumatically controlled chamber A, the valve stem moves to the first position, so that the first air port is connected to the third air port. When the pneumatically controlled chamber A discharges compressed gas, the valve stem moves to the second position, so that the first air port is connected to the second air port.

4. A dual-channel vacuum generator according to claim 3, characterized in that: The first end of the valve stem is connected to a first piston. The first piston slides against the peripheral wall of the first valve chamber. The first piston divides the first valve chamber into an air source chamber A, an air control chamber A, and a balance chamber. The balance chamber is located between the air source chamber A and the air control chamber A. Along the sliding direction of the first piston, the first piston has a first end and a second end opposite to each other. The first end has a first end face, and the second end has a second end face. The first end face is located in the air control chamber A, and the second end face is located in the air source chamber A. The area of ​​the first end face is larger than the area of ​​the second end face.

5. A dual-channel vacuum generator according to claim 3 or 4, characterized in that: The second end of the valve stem is connected to a second piston. The pneumatic directional valve A has a first valve port for connecting the first air port and the second air port, and a second valve port for connecting the first air port and the third air port. When the valve stem is in the first position, the second piston blocks the first valve port and opens the second valve port. When the valve stem is in the second position, the second piston opens the first valve port and blocks the second valve port.

6. A dual-channel vacuum generator according to claim 1, characterized in that: The pilot valve A also has a gas source port A and a working port A. The gas source port A is connected to a positive pressure gas source, and the working port A is connected to a pneumatic control chamber A. The working port A can be selectively connected to an exhaust port A or to a gas source port A.

7. A dual-channel vacuum generator according to claim 1, characterized in that: The vacuum generating unit further includes a second control mechanism connected to a positive pressure gas source, which is used to supply compressed gas from the positive pressure gas source to the negative pressure generating component.

8. A dual-channel vacuum generator according to claim 7, characterized in that: The second control mechanism includes a pneumatically controlled directional valve B and a pilot valve B, wherein, The pneumatically controlled reversing valve B has a fourth air port and a fifth air port. The fourth air port is connected to a positive pressure air source, and the fifth air port is connected to the air inlet of a negative pressure generating component. The pneumatically controlled reversing valve B also has a piston B, a spring B, and a working chamber B that cooperates with the piston B. When compressed gas is supplied to the working chamber B, or when compressed gas is discharged from the working chamber B, the piston B switches the air path of the pneumatically controlled reversing valve B. Pilot valve B has a gas source port B, a working port B and an exhaust port B. The gas source port B is connected to a positive pressure gas source, the working port B is connected to a working chamber B, and the exhaust port B is connected to the atmosphere. The working port B can be selectively connected to the gas source port B or to the exhaust port B.

9. A dual-channel vacuum generator according to claim 8, characterized in that: The pneumatically controlled directional valve B has a second valve chamber. The piston B divides the second valve chamber into a gas source chamber B and a working chamber B. The gas source chamber B is connected to a fourth gas port. The spring B is disposed between the piston B and the inner wall of the working chamber B. The piston B can move between a third position and a fourth position relative to the second valve chamber. When compressed gas is supplied to the working chamber B, the compressed gas in the working chamber B and the spring B together drive the piston B to move to the third position, thereby disconnecting the fifth gas port from the fourth gas port. When compressed gas is discharged from the working chamber B, the compressed gas in the gas source chamber B drives the piston B to move to the fourth position, thereby connecting the fifth gas port with the fourth gas port.

10. A dual-channel vacuum generator according to claim 2, characterized in that: The third air port is connected to a pilot valve B, which has a first working state and a second working state. When the pilot valve B is in the first working state, the third air port is connected to a positive pressure air source or to the atmosphere. When the pilot valve B is in the second working state, the third air port is disconnected from the positive pressure air source or from the atmosphere.

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