Multi-stage vacuum generator for dust environment

Abstract

The utility model discloses a multistage vacuum generator for a dust environment, which relates to the pneumatic technical field, and comprises a vacuum generator body, the left side of the vacuum generator body is provided with an L-shaped channel III, and an inner cavity at the left side of the channel III is fixedly provided with a nozzle, a first-stage vacuum tube and a second-stage vacuum tube in sequence from left to right; a first connector is formed in the left end of the nozzle. When negative pressure in the valve is weak, the elastic piece opens the second through hole, the second-stage vacuum pipe is connected with the third connector in the valve through the second-stage vacuum pipe, the second-stage vacuum pipe is connected with the third connector in the valve through the elastic piece along with increase of the negative pressure in the valve through the second-stage vacuum pipe through the second-stage vacuum pipe through the second-stage vacuum pipe through the second-stage vacuum pipe through the second-stage vacuum pipe through the second-stage vacuum pipe through the second-stage vacuum pipe, and therefore the suction cup obtains large vacuum flow and rapidly improves vacuum suction force. After vacuum material taking is completed, the vacuum gas path is closed, the blowing gas path is opened, the pressure is larger than the elastic force of the spring under the high pressure effect, the valve element moves rightwards in the first channel, connection between the third connector and the vacuum channel is closed, blown high-pressure gas fully flows to the suction cup, and the dust removal effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic technology, specifically to a multi-stage vacuum generator for dusty environments. Background Technology

[0002] Multistage vacuum generators are suitable for various applications requiring high vacuum flow rates, especially in dusty environments such as those in the pharmaceutical, food processing, and chemical industries. They can be used in conjunction with vacuum suction cups and are widely adopted in the material handling industry. Furthermore, multistage vacuum generators are also widely used in industrial automation in fields such as machinery, electronics, packaging, printing, plastics, and robotics.

[0003] Chinese patent document CN219159281U discloses a novel multi-stage vacuum generator. By using a supersonic vacuum generating tube in conjunction with the main body, it effectively reduces product energy consumption by 60% compared to traditional single-stage vacuum generators, and further enhances the product's adsorption capacity. By wrapping a filter element around the supersonic vacuum generating tube, the problem of easy clogging is effectively solved, while further enhancing the adsorption capacity.

[0004] The existing technology has the following problems:

[0005] In PCB manufacturing, integrated suction cups are generally used for perforated boards. To save energy, they are usually paired with multi-stage vacuum generators. However, when these multi-stage vacuum generators are used in dusty environments, a backflushing device is also required to remove dust, reduce clogging, and extend the service life of the integrated suction cups. There is still room for improvement in the combination of the backflushing device switching valve and the vacuum generator. Moreover, most current multi-stage vacuum generators are integrated structures, which are inconvenient to disassemble, making them difficult to maintain and service. Utility Model Content

[0006] This invention provides a multi-stage vacuum generator for dusty environments to solve the problems mentioned in the background art.

[0007] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows:

[0008] A multi-stage vacuum generator for dusty environments includes a vacuum generator body. An L-shaped channel three is formed on the left side of the vacuum generator body. From left to right, a nozzle, a primary vacuum tube, and a secondary vacuum tube are sequentially fixedly installed in the inner cavity of the left side of the channel three. An interface one is formed at the left end of the nozzle. A switching valve body is fixedly installed on the upper surface of the vacuum generator body by screws. A channel one is formed on the left side of the switching valve body. An end cap is fixedly installed on the left side of the channel one. An interface two is formed at the left end of the end cap. A sliding sleeve is fixedly installed in the inner cavity of the channel one. A valve core is slidably connected to the inner cavity of the sliding sleeve. The outer side of the valve core is sleeved with… The switching valve body is equipped with a spring. An L-shaped channel 2 is formed on the lower surface of the switching valve body. An interface 3 is formed on the right side of the upper surface of the switching valve body, and channel 1 communicates with interface 3 and channel 2. A top groove is formed on the upper surface of the bottom of the vacuum generator body. Through holes 1 and 2 are formed on the left and right sides of the upper surface of channel 3, respectively, and channel 3 communicates with through holes 1, 2, and the top groove. A spring housing is fixedly installed on the right side of the lower surface of the top groove by screws. An elastic sheet is provided above through hole 2. A positioning block is fixedly installed on the right side of the lower surface of the switching valve body. A positioning groove 1 is formed on the right side of the upper surface of the bottom of the vacuum generator body.

[0009] Preferably, a fixing seat is fixedly installed on the right side of the nozzle by screws, and a silencer is fixedly installed in both the upper and lower inner cavities of the fixing seat, and the silencer is connected to the right side of channel three.

[0010] Preferably, a partition is fixedly installed on the left side of the outer side of the valve core, and the two ends of the spring are fixedly installed to the right side of the partition and the left side of the sliding sleeve, respectively.

[0011] Preferably, the inner cavity at the top of the second channel is threaded with a plug.

[0012] Preferably, the lower surface of the switching valve body is provided with a slot 1, and the slot 1 is located outside the channel 2. The inner cavity of the slot 1 is fitted with a sealing ring 2, which is in the shape of an 8.

[0013] Preferably, a square slot 2 is provided at the bottom of the spring sheet shell, and a sealing ring 1 is engaged in the inner cavity of the slot 2. The groove at the bottom of the elastic sheet is movably connected to the left side wall of the sealing ring 1.

[0014] Preferably, the outer side of the positioning block is inserted into the inner cavity of the positioning groove, and both the positioning groove and the positioning block are L-shaped, with the positioning groove located on the outer side of the top groove.

[0015] Preferably, a cylindrical positioning groove 2 is formed on the lower surface of the top groove, and the positioning groove 2 is located on the left side of the through hole 2. A cylindrical positioning rod is fixedly installed on the left side of the lower surface of the spring sheet shell, and the outer side of the telescopic positioning rod is inserted into the inner cavity of the positioning groove 2.

[0016] Due to the adoption of the above technical solution, the technological progress achieved by this utility model compared to the prior art is as follows:

[0017] 1. This utility model provides a multi-stage vacuum generator for dusty environments. It connects to the high-pressure gas path controlling the vacuum circuit and the blowing gas path, as well as multiple suction cups via pipes through interfaces one, two, and three, respectively. During vacuum material removal, the high-pressure gas path controlling the vacuum circuit opens, and the high-pressure gas enters the vacuum generator body through the nozzle, thereby generating negative pressure. At this time, the high-pressure gas path controlling the blowing gas path is closed, and the spring force on the valve core is greater than the pressure generated by the negative pressure. The valve core and end cap are tightly fitted to form a sealed state, i.e., a closed state. When the negative pressure inside the valve is relatively weak, the elastic plate will open the through hole two, allowing... The connection between the secondary vacuum tube and the valve's internal passage to interface three is established. As the negative pressure inside the valve increases, the elastic plate closes the connection between the secondary vacuum tube and interface three, allowing the suction cup to obtain a larger vacuum flow and quickly increase the vacuum suction force. After vacuum material removal is completed, the vacuum path is closed and the blowing path is opened. Under high pressure, the pressure is greater than the spring force, and the valve core moves to the right in channel one, thereby closing the connection between interface three and the vacuum channel, thus preventing high-pressure gas leakage. This allows the high-pressure gas blown to flow fully to the suction cup, improving the dust removal effect. After blowing is completed, the blowing path is closed, and the valve core returns to its initial state under the action of the elastic force.

[0018] 2. This utility model provides a multi-stage vacuum generator for dusty environments. The vacuum generator body, switching valve body, spring plate housing, and fixing base are detachably installed by means of screws, which facilitates the maintenance and upkeep of the vacuum generator. The silencer can reduce the noise generated by the generator during operation, thereby reducing the noise generated during operation. When installing the vacuum generator body, switching valve body, and spring plate housing, the switching valve body and spring plate housing can be positioned and installed by setting a positioning block and positioning groove one, and a positioning rod and positioning groove two, which improves the installation efficiency. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of this utility model;

[0020] Figure 2 This is a first cross-sectional view of the present invention.

[0021] Figure 3 This is an enlarged structural diagram of point A in this utility model;

[0022] Figure 4 This is a second cross-sectional view of the present invention.

[0023] Figure 5 This is a schematic diagram of the sealing ring II structure of this utility model;

[0024] Figure 6 This is a schematic diagram of the vacuum generator body structure of this utility model;

[0025] Figure 7 This is a schematic diagram of the external structure of the spring clip of this utility model;

[0026] Figure 8 This is a schematic diagram of the valve core structure of this utility model;

[0027] Figure 9 This is a schematic diagram of the switching valve body structure of this utility model.

[0028] In the diagram: 1. Nozzle; 2. Vacuum generator body; 3. Primary vacuum tube; 4. Secondary vacuum tube; 5. Elastic sheet; 6. Sealing ring one; 7. Spring shell; 8. Fixing base; 9. Silencer; 10. End cap; 11. Switching valve body; 12. Valve core; 13. Plug; 14. Sliding sleeve; 15. Sealing ring two; 16. Spring; 17. Interface one; 18. Interface two; 19. Interface three; 20. Positioning block; 21. Positioning rod; 22. Channel one; 23. Slot one; 24. Positioning groove one; 25. Positioning groove two; 26. Through hole one; 27. Channel two; 28. Through hole two; 29. ​​Channel three; 30. Top groove; 31. Partition. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0030] like Figures 1-9As shown, a multi-stage vacuum generator for dusty environments includes a vacuum generator body 2. An L-shaped channel 3 29 is provided on the left side of the vacuum generator body 2. From left to right, a nozzle 1, a primary vacuum tube 3, and a secondary vacuum tube 4 are sequentially fixedly installed in the inner cavity of the left side of the channel 3 29. An interface 17 is provided at the left end of the nozzle 1. A switching valve body 11 is fixedly installed on the upper surface of the vacuum generator body 2 by screws. A channel 1 22 is provided on the left side of the switching valve body 11. An end cap 10 is fixedly installed on the left side of the channel 1 22. An interface 2 18 is provided at the left end of the end cap 10. A sliding sleeve 14 is fixedly installed in the inner cavity of the channel 1 22. A valve core 12 is slidably connected to the inner cavity of the sliding sleeve 14. A spring 16 is sleeved on the outer side of the valve core 12. A partition 31 is fixedly installed on the left side of the outer side of the valve core 12. The spring 16... The two ends are fixedly installed to the right side of the partition 31 and the left side of the sliding sleeve 14, respectively. An L-shaped channel 27 is opened on the lower surface of the switching valve body 11. An interface 3 19 is opened on the right side of the upper surface of the switching valve body 11. Channel 1 22 is connected to interface 3 19 and channel 2 27. A top groove 30 is opened on the upper surface of the bottom of the vacuum generator body 2. Through holes 1 26 and 2 28 are opened on the left and right sides of the upper surface of channel 3 29, respectively. Channel 3 29 is connected to through holes 1 26, 2 28 and top groove 30. A spring sheet housing 7 is fixedly installed on the right side of the lower surface of the top groove 30 by screws. An elastic piece 5 is provided above the through hole 2 28. A positioning block 20 is fixedly installed on the right side of the lower surface of the switching valve body 11. A positioning groove 1 24 is opened on the right side of the upper surface of the bottom of the vacuum generator body 2.

[0031] The high-pressure gas lines controlling the vacuum circuit and the blowing circuit, as well as multiple suction cups, are connected via pipes through interfaces 17, 18, and 19, respectively. During vacuum material removal, the high-pressure gas in the vacuum circuit is opened, and the high-pressure gas enters the vacuum generator body 2 through nozzle 1, thereby generating negative pressure. At this time, the high-pressure gas line controlling the blowing circuit is closed, and the elastic force of the spring 16 on the valve core 12 is greater than the pressure generated by the negative pressure. The valve core 12 and the end cap 10 are tightly fitted to form a sealed state, i.e., a closed state. When the negative pressure inside the valve is relatively weak, the elastic plate 5 will open the through hole 28, allowing the secondary vacuum tube 4 to connect to the valve through interface 19. As the negative pressure inside the valve increases, the elastic plate 5 will close the connection between the secondary vacuum tube 4 and the valve through interface 19. This allows the suction cup to obtain a larger vacuum flow and quickly increase the vacuum suction force. After vacuum material removal is completed, the vacuum air path is closed and the blowing air path is opened. Under high pressure, the pressure is greater than the elastic force of spring 16, and valve core 12 moves to the right in channel 1 22, thereby closing the connection between interface 3 19 and the vacuum channel, thus preventing high-pressure gas leakage, allowing the blown high-pressure gas to flow fully to the suction cup, improving the dust removal effect. After blowing is completed, the blowing air path is closed, and valve core 12 returns to its initial state under the action of elastic force. When it is necessary to maintain or replace the switching valve body 11, the vacuum generator body 2, or the spring shell 7, the screw installation between the vacuum generator body 2 and the switching valve body 11, spring shell 7 can be removed to facilitate the maintenance and upkeep of the vacuum generator.

[0032] like Figures 2-4 As shown, a mounting base 8 is fixedly installed on the right side of nozzle 1 by screws. A silencer 9 is fixedly installed in both the upper and lower inner cavities of the mounting base 8, and the silencer 9 is connected to the right side of channel 3 29.

[0033] The vacuum generator body 2 and the mounting base 8 are detachably installed by means of screws, which facilitates the maintenance and upkeep of the vacuum generator. The silencer 9 can reduce the noise generated by the generator during operation.

[0034] like Figures 1-4 As shown, a plug 13 is threaded into the inner cavity at the top of channel 27.

[0035] The plug 13 can seal the top of channel 27, allowing channel 27 to connect with interface 3 19 and channel 1 22.

[0036] like Figures 2-5 , Figure 9 As shown, a slot 23 is provided on the lower surface of the switching valve body 11, and the slot 23 is located outside the channel 27. A sealing ring 15 is engaged in the inner cavity of the slot 23. The sealing ring 15 is in the shape of an 8.

[0037] The sealing ring 2 15 can seal the contact surface between the vacuum generator body 2 and the switching valve body 11, thereby improving the sealing performance of the generator and preventing other substances from flowing out from the contact surface between the vacuum generator body 2 and the switching valve body 11.

[0038] like Figure 2 , Figure 4 , Figure 7 As shown, a square slot 2 is provided at the bottom of the spring sheet housing 7. A sealing ring 6 is engaged in the inner cavity of the slot 2. The groove at the bottom of the elastic sheet 5 is movably connected to the left side wall of the sealing ring 6.

[0039] The sealing ring 6 is installed to improve the sealing performance of the contact surface between the vacuum generator body 2 and the sealing ring 6, thereby further improving the sealing performance of the generator.

[0040] like Figure 2 , Figure 4 , Figure 6 , Figure 9 As shown, the outer side of the positioning block 20 is inserted into the inner cavity of the positioning groove 24. Both the positioning groove 24 and the positioning block 20 are L-shaped, and the positioning groove 24 is located on the outer side of the top groove 30.

[0041] When installing the vacuum generator body 2 and the switching valve body 11, place the switching valve body 11 on the left side of the vacuum generator body 2, and insert the positioning block 20 into the inner cavity of the positioning groove 24 on the vacuum generator body 2 to position the switching valve body 11 so that the mounting holes on the vacuum generator body 2 and the switching valve body 11 are aligned. Then, rotate the screws to lock and fix the vacuum generator body 2 and the switching valve body 11.

[0042] like Figure 2 , Figure 4 , Figure 6 , Figure 7 As shown, a cylindrical positioning groove 25 is provided on the lower surface of the top groove 30, and the positioning groove 25 is located on the left side of the through hole 28. A cylindrical positioning rod 21 is fixedly installed on the left side of the lower surface of the spring shell 7, and the outer side of the telescopic positioning rod 21 is inserted into the inner cavity of the positioning groove 25.

[0043] When installing the vacuum generator body 2 and the spring housing 7, place the spring housing 7 on the upper surface of the top groove 30 and insert the positioning rod 21 into the inside of the positioning groove 25 to position the spring housing 7, so that the mounting holes on the vacuum generator body 2 and the spring housing 7 are aligned. Rotate the screw to lock and fix the vacuum generator body 2 and the spring housing 7, making the disassembly and installation of the spring housing 7 more convenient and improving the installation efficiency.

[0044] The working principle of this utility model is as follows: Interface 17, Interface 28, and Interface 319 are respectively connected to the high-pressure gas path controlling the vacuum path and the blowing path, as well as multiple suction cups via pipes. During vacuum material removal, the high-pressure gas path controlling the vacuum path is opened, and the high-pressure gas enters the vacuum generator body 2 through nozzle 1, thereby generating negative pressure. At this time, the high-pressure gas path controlling the blowing path is closed, and the spring force of the valve core 12 is greater than the pressure generated by the negative pressure. The valve core 12 and the end cap 10 are tightly fitted to form a sealed state, i.e., a closed state. When the negative pressure inside the valve is relatively weak, the elastic plate 5 will open the through hole 28, allowing the secondary vacuum tube 4 to connect to the valve through interface 319. As the negative pressure inside the valve increases, the elastic plate 5 will close the connection between the secondary vacuum tube 4 and the valve through interface 319, allowing the suction cups to obtain a larger vacuum flow and rapidly increase the vacuum suction. After vacuum material removal is completed, the vacuum path is closed and the blowing path is opened. Under the action of high pressure, the pressure is greater than the spring force of spring 16, and the valve core 12... The channel 12 moves to the right, thereby closing the connection between the interface 319 and the vacuum channel, thus preventing high-pressure gas leakage and allowing the high-pressure gas to flow fully to the suction cup, improving the dust removal effect. After blowing is completed, the blowing air path is closed, and the valve core 12 returns to its initial state under the action of elasticity. When it is necessary to maintain or replace the switching valve body 11, the vacuum generator body 2, the silencer 9, or the spring shell 7, the screw installation between the vacuum generator body 2 and the switching valve body 11, the spring shell 7, and the fixing seat 8 can be disassembled, which is convenient for the maintenance and upkeep of the vacuum generator. When installing the vacuum generator body 2, the switching valve body 11, and the spring shell 7, the positioning block 20 and the positioning groove 1 24, and the positioning rod 21 and the positioning groove 25 can be set to position and install the switching valve body 11 and the spring shell 7, improving the installation efficiency. The silencer 9 can reduce the noise generated by the generator during operation.

[0045] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A multi-stage vacuum generator for a dusty environment comprising an L-shaped vacuum generator body (2), characterized in that: The left side of the vacuum generator body (2) is provided with an L-shaped channel three (29), the left side of the channel three (29) is sequentially fixedly installed with a nozzle (1), a first-stage vacuum tube (3) and a second-stage vacuum tube (4) from left to right, the left end of the nozzle (1) is provided with an interface one (17), the upper surface of the vacuum generator body (2) is fixedly installed with a switching valve body (11) through screws, the left side of the switching valve body (11) is provided with a channel one (22), the left side of the channel one (22) is fixedly installed with an end cover (10), the left end of the end cover (10) is provided with an interface two (18), the inner cavity of the channel one (22) is fixedly installed with a sliding sleeve (14), the inner cavity of the sliding sleeve (14) is slidably connected with a valve core (12), the outer side of the valve core (12) is sleeved with a spring (16), the lower surface of the switching valve body (11) is provided with an L-shaped channel two (27), the upper surface of the switching valve body (11) is provided with an interface three (19), and the channel one (22) is in communication with the interface three (19) and the channel two (27), the upper surface of the bottom of the vacuum generator body (2) is provided with a top groove (30), the upper surface of the channel three (29) is provided with a through hole one (26) and a through hole two (28) respectively, and the channel three (29) is in communication with the through hole one (26), the through hole two (28) and the top groove (30), the right side of the lower surface of the top groove (30) is fixedly installed with a spring shell (7) through screws, the upper side of the through hole two (28) is provided with an elastic sheet (5), the right side of the lower surface of the switching valve body (11) is fixedly installed with a positioning block (20), and the right side of the upper surface of the bottom of the vacuum generator body (2) is provided with a positioning groove one (24).

2. A multi-stage vacuum generator for a dusty environment according to claim 1, characterized in that: The right side of the nozzle (1) is fixedly installed with a fixed seat (8) through screws, the two inner cavities of the fixed seat (8) are fixedly installed with silencers (9), and the silencers (9) are in communication with the right side of the channel three (29).

3. The multi-stage vacuum generator for a dusty environment according to claim 1, characterized in that: The left side of the outer side of the valve core (12) is fixedly installed with a partition sheet (31), and the two ends of the spring (16) are fixedly installed with the right side of the partition sheet (31) and the left side of the sliding sleeve (14) respectively.

4. The multi-stage vacuum generator for a dusty environment according to claim 1, characterized in that: The inner cavity of the top of the channel two (27) is threadedly connected with a plug (13).

5. The multi-stage vacuum generator for a dusty environment according to claim 1, characterized in that: The lower surface of the switching valve body (11) is provided with a clamping groove one (23), and the clamping groove one (23) is located on the outer side of the channel two (27), the inner cavity of the clamping groove one (23) is clamped with a sealing ring two (15), and the sealing ring two (15) is in the shape of an 8.

6. The multi-stage vacuum generator for a dusty environment according to claim 1, characterized in that: The bottom of the spring shell (7) is provided with a square clamping groove two, the inner cavity of the clamping groove two is clamped with a sealing ring one (6), and the recess of the bottom of the elastic sheet (5) is movably connected with the left side wall of the sealing ring one (6).

7. The multi-stage vacuum generator for a dusty environment according to claim 1, characterized in that: The outer side of the positioning block (20) is inserted into the inner cavity of the positioning groove one (24), the positioning groove one (24) and the positioning block (20) are both in the shape of an L, and the positioning groove one (24) is located on the outer side of the top groove (30).

8. The multi-stage vacuum generator for a dusty environment according to claim 1, characterized in that: The lower surface of the top groove (30) is provided with a cylindrical positioning groove two (25), and the positioning groove two (25) is located at the left side of the through hole two (28), and the left side of the lower surface of the elastic sheet shell (7) is fixedly provided with a cylindrical positioning rod (21), and the outer side of the telescopic positioning rod (21) is inserted with the inner cavity of the positioning groove two (25).

Images