Vacuum generating tube and vacuum generator

Abstract

The utility model discloses a vacuum generating tube and a vacuum generator. The vacuum generating tube comprises a nozzle, a first-stage diffusion tube and a multi-stage diffusion tube which are connected in sequence, annular mounting grooves are formed in the outer surfaces of the nozzle and the air outlet end of the first-stage diffusion pipe, annular rubber rings are arranged in the annular mounting grooves, at least two one-way valve plates are arranged on the annular rubber rings, and the annular rubber rings and the one-way valve plates are integrally manufactured into flexible one-way valves; an airflow through hole is formed in the position, corresponding to the one-way valve plate, of the first shell sleeve. The first-stage diffusion pipe is connected with the multi-stage diffusion pipe through a second shell sleeve; airflow through holes are formed in the positions, corresponding to the one-way valve plate, of the first shell sleeve and the positions, corresponding to the one-way valve plate, of the second shell sleeve; the vacuum generator uses the vacuum generating tube. The valve is simple in structure, high in response speed, large in flow and convenient and fast to assemble.

Description

Technical Field

[0001] This utility model relates to the field of vacuum adsorption technology, specifically to a vacuum generating tube and a vacuum generator. Background Technology

[0002] A vacuum generator is a device that uses compressed air to create a vacuum. After positive pressure gas is introduced into the vacuum generator, the gas enters the vacuum generating tube and forms a high-velocity gas flow in the inner cavity. According to Bernoulli's equation, the air pressure is low in the high-velocity area, and the relatively high-pressure air in the surrounding area will flow to the low-pressure area, forming a siphon effect in a local area, which in turn draws away the surrounding gas. Since the internal cavity of the vacuum generator is connected and sealed to the vacuum generating tube through sealing rings, the inner cavity can be separated from the outside. The cavity where the gas is drawn away forms a sealed container, presenting a negative pressure vacuum state.

[0003] As the core component for generating a vacuum, the efficiency and reaction speed of the vacuum generating tube affect the vacuum adsorption capacity. Existing vacuum generating tubes are isolated from the internal cavity of the vacuum generator by a one-way valve. The one-way valve has a protrusion at its bottom and is fixed axially, radially, and circumferentially by a groove inside the vacuum generating tube. During assembly, the one-way valve is pressed into the groove and then inserted into the outer tube. This process requires workers to press it with their fingers, which is prone to fatigue and reduces efficiency.

[0004] Furthermore, when it is necessary to improve vacuum efficiency, the usual practice is to open more vent holes. With the increase in the number of second-stage vent holes, more one-way valves are required. When more than two one-way valves are assembled at the same time, the difficulty for workers to press them increases significantly, which can easily lead to some one-way valves not being pressed in place, or falling off or being mispositioned when inserted into the outer casing tube, ultimately resulting in a significant reduction in assembly efficiency. Summary of the Invention

[0005] The technical problem to be solved by this utility model is to provide a vacuum generating tube and a vacuum generator, which has a simple structure, fast response speed, large flow rate, and convenient assembly.

[0006] To solve the above-mentioned technical problems, this utility model provides a vacuum generating tube, comprising a nozzle, a primary diffuser tube, and a multi-stage diffuser tube connected in sequence;

[0007] The nozzle and the outer surface of the outlet end of the first-stage diffuser are provided with an annular mounting groove. An annular rubber ring is provided in the annular mounting groove. At least two one-way valve plates are provided on the annular rubber ring. The annular rubber ring and the one-way valve plates are integrally manufactured into a flexible one-way valve.

[0008] The first shell sleeve is arranged at the corresponding position of the one-way valve sheet, and the second shell sleeve is arranged at the corresponding position of the one-way valve sheet, and air flow through holes are formed in the first shell sleeve and the second shell sleeve.

[0009] Further, the multi-stage diffusion pipe comprises a second-stage diffusion pipe and a third-stage diffusion pipe, the second-stage diffusion pipe and the third-stage diffusion pipe are both provided with a second shell sleeve, the second-stage diffusion pipe is connected to the air outlet end of the first shell sleeve through the corresponding second shell sleeve, and the third-stage diffusion pipe is connected to the air outlet end of the second shell sleeve through the corresponding second shell sleeve.

[0010] Further, the air outlet end of the second-stage diffusion pipe is also provided with a second annular mounting groove and a flexible one-way valve.

[0011] Further, the inner side surface of the one-way valve sheet and located on the side of the annular rubber ring is provided with a wall-reducing groove, and at least one side of the wall-reducing groove is communicated with the side edge of the one-way valve sheet.

[0012] Further, the first shell sleeve and the nozzle outer surface and the second shell sleeve and the first-stage diffusion pipe are both provided with a connecting sealing ring.

[0013] Further, the first shell sleeve and the first-stage diffusion pipe and the second shell sleeve and the multi-stage diffusion pipe are both integrally formed by injection molding.

[0014] Further, the air flow through holes are four and uniformly arranged, and each air flow through hole corresponds to one one-way valve sheet.

[0015] A vacuum generator comprises an outer shell, and the outer shell is provided with the vacuum generating pipe.

[0016] Further, the outer shell is internally provided with a containing cavity, one end of the containing cavity is provided with an annular limiting block and is connected with the outside in a penetrating mode, the other end of the containing cavity is provided with an annular limiting lock head, the vacuum generating pipe is arranged in the containing cavity, the vacuum generating pipe is fixed in an axial direction through cooperation of the annular limiting block and the limiting lock head, the vacuum generating pipe is provided with a positioning sealing ring at both ends, a negative pressure cavity is formed between the two positioning sealing rings, the outer surface of the vacuum generating pipe and the inner wall of the containing cavity, and the outer shell is provided with a vacuum port, and the vacuum port is connected with the negative pressure cavity in a penetrating mode.

[0017] Further, the outer shell is further provided with a vacuum breaking port, and the vacuum breaking port is connected with the negative pressure cavity in a penetrating mode.

[0018] The beneficial effects of the utility model are as follows:

[0019] 1. A flexible one-way valve is made by integrating an annular rubber ring and a one-way valve plate. The flexible one-way valve can be fixed by expanding the annular rubber ring and then fitting it into the annular mounting groove. There is no need for workers to help maintain the assembly position of the one-way valve plate, which greatly reduces the assembly difficulty, increases efficiency, and improves assembly quality.

[0020] 2. Since there is no need to support or press the flexible one-way valve, increasing the number of air passages will not increase the assembly difficulty. Increasing the number of air passages greatly improves the efficiency of vacuum generation and reaction speed. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the vacuum generating tube structure of this utility model;

[0022] Figure 2 This is a utility model Figure 1 A schematic diagram of the cross-sectional structure;

[0023] Figure 3 This is a utility model Figure 1 A schematic diagram of the exploded structure;

[0024] Figure 4 This is an exploded schematic diagram of the gas outlet structure of the first-stage diffuser of this utility model.

[0025] Figure 5 This is a schematic diagram of the flexible one-way valve structure of this utility model;

[0026] Figure 6 This is a schematic diagram of the vacuum generator structure of this utility model;

[0027] Figure 7 This is a utility model Figure 6 A schematic diagram of the cross-sectional structure;

[0028] Figure 8 This is a schematic diagram of a small-sized vacuum generator structure in one embodiment of this utility model;

[0029] Figure 9 This is a utility model Figure 8 A schematic diagram of the cross-sectional structure. Detailed Implementation

[0030] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0031] Reference Figures 1 to 5 As shown, one embodiment of the vacuum generating tube of this utility model includes a nozzle 1, a primary diffuser 2, and a multi-stage diffuser 3 connected in sequence.

[0032] The outer surface of the gas outlet end of the nozzle and the primary diffusion pipe is provided with an annular mounting groove 4, and an annular rubber ring 5 is arranged in the annular mounting groove, and at least two one-way valve pieces 6 are arranged on the annular rubber ring, and the annular rubber ring and the one-way valve pieces are integrally prepared as a flexible one-way valve; during assembly, only the annular rubber ring needs to be expanded, and then released at the corresponding annular mounting groove position to complete the installation, and the operation can be completed by cooperating with an automatic machine, which is similar to the assembly of a sealing ring.

[0033] The nozzle and the primary diffusion pipe are connected through a first outer shell sleeve 7 to form the assembly of the two, and the primary diffusion pipe and the multi-stage diffusion pipe are connected through a second outer shell sleeve 8 to form the assembly of the two; the first outer shell sleeve is located at the corresponding position of the one-way valve piece, and the second outer shell sleeve is located at the corresponding position of the one-way valve piece, and gas flow through holes 9 are arranged in the first outer shell sleeve and the second outer shell sleeve to form the opening and closing effect during work.

[0034] Specifically, when the nozzle part is connected to a positive pressure gas, the compressed air enters the narrow channel of the nozzle, the gas flow rate is accelerated, and then the nozzle angle is adjusted, the internal cavity is enlarged, and the compressed air flow rate is increased again, and part of the gas flow rate can reach supersonic speed. According to Bernoulli's equation, the air pressure is lower in the place with high flow rate, and the air pressure is higher in other places, so the high-pressure gas will flow to the low-pressure position, so that the surrounding air will be sucked away when the high-speed gas flows. Because the flexible one-way valve is arranged at the gas flow through hole of the first outer shell sleeve and the second outer shell sleeve, the gas can only flow in one direction, and the sucked air can only flow from the outside to the inside. The gas flows through the multi-stage diffusion pipe from the nozzle, and the one-way flow does not discharge from the radial side, so that the air can be accelerated multiple times, and the air outside the flexible one-way valve can be taken away multiple times, so that the air pressure around the flexible one-way valve is further reduced, and a high-vacuum state is achieved.

[0035] The multi-stage diffusion pipe comprises a two-stage diffusion pipe 10 and a three-stage diffusion pipe 11, and the two-stage diffusion pipe and the three-stage diffusion pipe are both provided with a second shell sleeve, the two-stage diffusion pipe is connected to the air outlet end of the first shell sleeve through the corresponding second shell sleeve, and the three-stage diffusion pipe is connected to the air outlet end of the second shell sleeve through the corresponding second shell sleeve, so that the first end and the second end are connected. The first shell sleeve and the one-stage diffusion pipe and the second shell sleeve and the multi-stage diffusion pipe are both integrally formed by injection molding, and during assembly, only simple insertion is required to complete the assembly, thereby improving the assembly efficiency. The connecting sealing ring 13 is arranged between the first shell sleeve and the outer surface of the nozzle and between the second shell sleeve and the one-stage diffusion pipe, and the connecting sealing ring can provide a sealing effect and realize the connection between the two components through the deformation of the connecting sealing ring. Since the diffusion pipe and the shell sleeve are integrally fixed, the relative position of the diffusion pipe and the shell sleeve is fixed, and the assembly can be completed by one-time sleeving. The relative assembly position precision between the connected nozzle and the diffusion pipe and between the diffusion pipes is high, and the high-speed airflow movement effect is good.

[0036] The outer surface of the air outlet end of the two-stage diffusion pipe is also provided with a second annular mounting groove and a flexible one-way valve. In the process of further increasing the flow rate, the air can be taken away again, thereby forming a high vacuum effect. The second annular mounting groove has the same effect as the annular mounting groove and is used for convenient installation of the flexible one-way valve.

[0037] In order to effectively improve the vacuum response speed, a reduced-wall groove 12 is arranged on the inner surface of the one-way valve piece and on the side of the annular rubber ring. The reduced-wall groove can improve the bending performance between the one-way valve piece and the annular rubber ring, so that the airflow flows instantaneously and cooperates with the action. The one-way valve piece body part also has a certain thickness, and under high vacuum, it will not deform too much and cause the problem of breaking the vacuum.

[0038] At least one side of the reduced-wall groove is connected to the side of the one-way valve piece, that is, the one-way valve piece has improved bending performance on one side. Compared with the full-length structure, the full-length reduced-wall groove will cause the overall bending performance to be too large and not easy to reset, or the reset position is not accurate. Therefore, through the design of the partial reduced-wall, the one-way valve piece located in the reduced-wall groove part will act first at the moment of vacuum triggering, and the part without the reduced-wall groove will act later due to its higher strength. Therefore, at the moment, a faster response speed can be provided, and the part without the reduced-wall groove has a higher strength at the moment of triggering the vacuum to the holding vacuum, so that the reset position is accurate.

[0039] The airflow through holes are four and are uniformly arranged, and each airflow through hole corresponds to one one-way valve piece, so that more airflow through holes can be arranged without affecting the action of the one-way valve piece.

[0040] In an embodiment, a positioning gap can also be arranged on the annular rubber ring, which is located at a position corresponding to the gap between the two one-way valve pieces, and a protrusion can be arranged on the inner wall of the corresponding shell sleeve, which is located in the positioning gap after the insertion and installation is completed, so as to achieve the rotation stopping effect of the annular rubber ring, and thus the relative positions of the one-way valve pieces and the air flow through hole can be determined based on the positioning, and the assembly precision is greatly improved after the positions of the two are determined.

[0041] According to Figure 6 and Figure 7 , the application further discloses a vacuum generator, which comprises an outer shell 111, and a vacuum generating pipe 112 described above is arranged in the outer shell. An accommodation cavity is arranged in the inner part of the outer shell, one end of the accommodation cavity is provided with an annular limiting block 14 and is connected with the outside, the other end of the accommodation cavity is provided with an annular limiting lock head 15, the vacuum generating pipe is arranged in the accommodation cavity, the vacuum generating pipe is fixed in the axial direction through the cooperation of the annular limiting block and the limiting lock head, and positioning sealing rings 16 are arranged at both ends of the vacuum generating pipe. The two positioning sealing rings, the outer surface of the vacuum generating pipe and the inner wall of the accommodation cavity cooperate to form a negative pressure cavity 17, and a vacuum port 18 is arranged on the outer shell and is connected with the negative pressure cavity.

[0042] The annular limiting block is an integral preparation structure in the accommodation cavity, in assembly, the vacuum generating pipe is directly inserted from the other end of the accommodation cavity, so that the nozzle is in abutment with the annular limiting block in the axial direction, and the outer periphery is sealed through the positioning sealing ring, and the position is fixed through the deformation of the positioning sealing ring. Then, the annular limiting lock head is sleeved on the other end of the vacuum generating pipe and is fixed with the outer shell, the annular limiting lock head cooperates with the annular limiting block to limit the axial and radial positions of the vacuum generating pipe, and positioning sealing rings are also arranged between the annular limiting lock head and the end part of the vacuum generating pipe, so that the space in the inner part of the outer shell forms a negative pressure cavity; after compressed air is connected from the nozzle, based on the working description of the vacuum generating pipe, the air in the negative pressure cavity is sucked away, so that a vacuum negative pressure is formed, that is, the vacuum port connected with the negative pressure cavity can realize the vacuum adsorption effect. A quick connector can be installed on the outer shell at the end part of the air inlet of the nozzle, so as to facilitate the insertion of the air pipe.

[0043] A connecting sleeve can be arranged between the outer shell and the annular limiting lock head to meet the design needs of long size, and the connecting sleeve and the outer shell are designed in a split manner, which is beneficial to preparation.

[0044] In some application scenarios, it is also necessary to perform vacuum breaking assisted unloading, therefore, a vacuum breaking port 19 is arranged on the outer shell, the vacuum breaking port is connected with the negative pressure cavity, when it is necessary to use, an external pipeline is connected, and the positive pressure gas is introduced to realize the vacuum breaking and back blowing effects. When it is not used, a plug can be used for plugging.

[0045] In an embodiment, for the vacuum generator, a lock hole can be designed at the bottom of the outer shell, and the lock hole is fixed by a screw.

[0046] The vacuum generator of the present application has the advantages of simplified structure, easy operation, convenient maintenance, fast internal vacuum generation pipe working reaction, high efficiency, and modular design, which improves production efficiency and saves energy and reduces emissions.

[0047] In an embodiment, according to the use scene and use requirements of the customer, the number of multi-stage diffusion pipes can be increased or decreased, as shown in Figure 8 and Figure 9 The number of multi-stage diffusion pipes is 1, that is, only two-stage diffusion pipes, and the entire generation pipe includes a nozzle, a one-stage diffusion pipe, and a two-stage diffusion pipe, which reduces the overall length size under the premise of meeting the use requirements. When used, the working principle is consistent with the above-mentioned embodiment principle.

[0048] Specifically, since there are only two-stage diffusion pipes, a connecting sleeve pipe can not be provided, and the outer shell and the annular limiting lock head are directly locked, so that the vacuum generator of the present application has the advantages of modular design, which improves efficiency, saves energy, and reduces emissions.

[0049] The above embodiments are only preferred embodiments for fully illustrating the present application, and the protection scope of the present application is not limited thereto. Equivalent substitutions or transformations made by those skilled in the art on the basis of the present application are within the protection scope of the present application.

Claims

1. A vacuum generating tube, characterized by, The nozzle, the first-stage diffusion pipe and the multi-stage diffusion pipe are sequentially connected. An annular mounting groove is arranged on the outer surface of the nozzle and the air outlet end of the first-stage diffusion pipe, and an annular rubber ring is arranged in the annular mounting groove. The nozzle and the first-stage diffusion pipe are connected through a first outer shell sleeve, and the first-stage diffusion pipe and the multi-stage diffusion pipe are connected through a second outer shell sleeve.

2. The vacuum generating tube of claim 1, wherein, The second-stage diffusion pipe and the third-stage diffusion pipe are connected to the air outlet end of the first-stage diffusion pipe and the second-stage diffusion pipe through corresponding second outer shell sleeves.

3. The vacuum generating tube of claim 2, wherein, The outer surface of the air outlet end of the second-stage diffusion pipe is also provided with a second annular mounting groove and a flexible one-way valve.

4. The vacuum generating tube of claim 1, wherein, A wall-reducing groove is arranged on the inner surface of the one-way valve piece and on the side of the annular rubber ring.

5. The vacuum generating tube of claim 1, wherein, The first outer shell sleeve and the nozzle, and the second outer shell sleeve and the first-stage diffusion pipe are both provided with a connecting sealing ring.

6. The vacuum generating tube of claim 1, wherein, The first outer shell sleeve and the first-stage diffusion pipe, and the second outer shell sleeve and the multi-stage diffusion pipe are integrally formed by injection molding.

7. The vacuum generating tube of claim 1, wherein, The air flow through holes are four and uniformly arranged, and each air flow through hole corresponds to one one-way valve piece.

8. A vacuum generator, characterized by The vacuum generating pipe is arranged in the accommodating cavity.

9. The vacuum generator of claim 8, wherein, The outer shell is also provided with a vacuum breaking port which is in through connection with the negative pressure cavity.

10. The vacuum generator of claim 9, wherein, The outer shell is also provided with a vacuum breaking port which is in through connection with the negative pressure cavity.

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