Negative pressure generating mechanism and mounting structure thereof

Abstract

The negative pressure generating mechanism comprises a nozzle and an injection pipe, the nozzle is arranged at the air inlet end of the injection pipe, an injection channel corresponding to the nozzle is arranged in the injection pipe, an air suction port communicated with the injection channel is formed in the side wall of the air inlet end of the injection pipe, and a first connecting structure is arranged between the nozzle and the injection pipe in a matched mode. Based on the negative pressure generating mechanism, the utility model further provides an installation structure of the negative pressure generating mechanism, the installation structure comprises a vacuum generator body and further comprises the negative pressure generating mechanism, the vacuum generator body is provided with an installation cavity, and the installation cavity is provided with a first connecting structure and a second connecting structure. The negative pressure generating mechanism is inserted into the mounting cavity, the air outlet connector is locked and matched with the vacuum generator body, the air outlet connector is prevented from being separated from the vacuum generator body in the working state, in addition, the replacement efficiency of the negative pressure generating mechanism is high, and the maintenance time and cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a vacuum equipment technical field, especially a kind of negative pressure generating mechanism and its installation structure. BACKGROUND

[0002] The vacuum generator is a kind of equipment for generating vacuum by using fluid dynamics principle, it is usually composed of a high-speed nozzle, a diffuser and a mixing chamber, when high-pressure fluid (such as compressed air) passes through nozzle, flow rate will increase significantly, thereby forming low-pressure zone at nozzle outlet, this low-pressure zone will attract surrounding air or other gas, form vacuum, subsequently, these gas is decelerated by diffuser, pressure gradually recovers, finally, discharge system. Vacuum generator is widely used in industrial automation, material handling, packaging machinery and laboratory equipment and other fields, because of its simple structure, low cost is favored.

[0003] For example, the energy-saving vacuum generator disclosed in Chinese patent application (publication number: CN113864153A) includes a generator main body, an air inlet joint connected with an external air source, a vacuum joint, and a piston arranged in the generator main body. The generator main body further comprises a negative pressure generating mechanism, which comprises a primary nozzle and a secondary nozzle. The primary nozzle and the secondary nozzle are located in a nozzle cavity in the generator main body. A diaphragm lower cavity is arranged below the nozzle cavity and is connected with the vacuum joint through an air path. Two independent through holes, i.e., a primary through hole and a secondary through hole, are arranged between the nozzle cavity and the diaphragm lower cavity. The primary through hole is located below the primary nozzle, and the secondary through hole is located below the secondary nozzle. A primary diaphragm is arranged at the primary through hole, and a secondary diaphragm is arranged at the secondary through hole. The piston comprises a vacuum piston, which is located in a vacuum containing cavity in the generator main body. The outer wall of the vacuum piston divides the vacuum containing cavity into an upper vacuum piston cavity and a lower vacuum piston cavity. The air inlet joint is connected with the upper vacuum piston cavity and the air inlet end of the vacuum valve through an air path. The air outlet end of the vacuum valve is connected with the top air inlet of the vacuum piston through an air path. The lower vacuum piston cavity is connected with the primary nozzle through an air path, and the primary nozzle is connected with the secondary nozzle. The external air source enters the air inlet joint and reaches the upper vacuum piston cavity and the vacuum valve through an air path. When the vacuum valve is working, the air outlet valve of the vacuum valve is opened, the air outlet end of the vacuum valve discharges air, the vacuum piston is pressed downward, the valve at the vacuum piston is opened, the upper vacuum piston cavity and the lower vacuum piston cavity are connected, the gas enters the lower vacuum piston cavity, and then enters the primary nozzle through an air path to generate negative pressure, which drives the primary diaphragm below to lift up, so that the diaphragm lower cavity generates negative pressure. When the air path passes through the secondary nozzle, negative pressure is generated, which drives the secondary diaphragm below to lift up, so that the diaphragm lower cavity generates negative pressure. The primary nozzle and the secondary nozzle jointly drive the vacuum joint to work. However, when the negative pressure generating mechanism needs to be replaced, a positive pressure air with a higher pressure than the compressed gas required for negative pressure generation needs to be introduced into the nozzle cavity, and the positive pressure air acts on the primary nozzle to push the negative pressure generating mechanism out of the nozzle cavity. Since the components of the negative pressure generating mechanism are sequentially abutted, the components can only be removed one by one. The air supply to the nozzle cavity needs to be stopped after the primary nozzle is removed from the nozzle cavity, which results in low replacement efficiency and increases maintenance time and cost. Therefore, it is necessary to improve it. Utility model content

[0004] The utility model discloses to the defects and the insufficient of prior art, provide a negative pressure generating mechanism and its installation structure, simple and reasonable structure, convenient operation, convenient replacement, high replacement efficiency, reduce maintenance time and cost.

[0005] To achieve the above object, the utility model adopts the following technical scheme:

[0006] The utility model discloses a negative pressure generating mechanism, including nozzle and ejector pipe, and the nozzle is arranged in the air inlet end of ejector pipe, and the ejector pipe is equipped with the suction port that communicates with the injection channel corresponding with the nozzle in the inside, and the side wall of the air inlet end of ejector pipe is equipped with the suction port that communicates with the injection channel, and the nozzle is equipped with the first connecting structure with the cooperation of the ejector pipe, and the nozzle is connected with the air inlet end of the first stage injection pipe through the first connecting structure, and the air outlet end of the first stage injection pipe is connected with the air inlet end of the second stage injection pipe, and the injection channel includes the first stage injection channel that is arranged in the first stage injection pipe and the second stage injection channel that is arranged in the second stage injection pipe, and the suction port includes the first suction port that is arranged in the air inlet end of the first stage injection pipe and the second suction port that is arranged in the air inlet end of the second stage injection pipe, and the first suction port communicates with the first stage injection channel, and the second suction port communicates with the second stage injection channel, and the first stage injection pipe is equipped with the second connecting structure with the cooperation of the second stage injection pipe, and the first stage injection pipe is connected with the air inlet end of the second stage injection pipe through the second connecting structure, and the first stage injection pipe is connected with the air inlet end of the second stage injection pipe through the second connecting structure, and the first stage injection pipe is connected with the air inlet end of the second stage injection pipe through the second connecting structure.

[0007] Further, the first connecting structure includes a first connecting lug provided on the nozzle and a first connecting slot provided on the air inlet end of the ejector pipe, and the first connecting slot is connected with the first connecting lug.

[0008] Further, the ejector pipe includes a first stage injection pipe and a second stage injection pipe connected in series along the axial direction, the nozzle is connected to the air inlet end of the first stage injection pipe through the first connecting structure, the air outlet end of the first stage injection pipe is connected to the air inlet end of the second stage injection pipe, the injection channel includes a first stage injection channel arranged in the first stage injection pipe and a second stage injection channel arranged in the second stage injection pipe, the suction port includes a first suction port arranged at the air inlet end of the first stage injection pipe and a second suction port arranged at the air inlet end of the second stage injection pipe, the first suction port is in communication with the first stage injection channel, the second suction port is in communication with the second stage injection channel, the first stage injection pipe and the second stage injection pipe are connected through a second connecting structure, and the first stage injection pipe and the second stage injection pipe are connected through the second connecting structure at least in the axial direction.

[0009] Further, the second connecting structure includes a second connecting lug provided on the air outlet end of the first stage injection pipe and a second connecting slot provided on the air inlet end of the second stage injection pipe, and the second connecting slot is connected with the second connecting lug.

[0010] Further, the ejector pipe further includes an air outlet connector provided on the air outlet end of the ejector pipe, the air outlet connector is provided with an air outlet port in communication with the injection channel, the ejector pipe and the air outlet connector are connected through a third connecting structure, and the ejector pipe and the air outlet connector are connected through the third connecting structure at least in the axial direction.

[0011] Further, the third connecting structure includes a third connecting lug provided on the air outlet end of the ejector pipe and a third connecting slot provided on the air outlet connector, and the third connecting slot is connected with the third connecting lug.

[0012] Further, the end of the air outlet connector away from the ejector pipe is provided with a handle part.

[0013] Based on the above-mentioned negative pressure generating mechanism, a mounting structure of the negative pressure generating mechanism is also provided, which includes a vacuum generator body and the negative pressure generating mechanism, the vacuum generator body is provided with a mounting chamber, the negative pressure generating mechanism is inserted into the mounting chamber, and the air outlet connector is locked and matched with the vacuum generator body.

[0014] Further, the side wall of the gas outlet joint extends radially outward and is provided with a limiting portion, the inner wall of the mounting chamber is provided circumferentially with a limiting groove in sliding fit with the limiting portion, and the inner wall of the mounting chamber is further provided with a notch groove in communication with the limiting groove, the notch groove extending outward along the axial direction of the mounting chamber, when the gas outlet joint rotates relative to the mounting chamber, the limiting portion rotates in the limiting groove, and when the limiting portion rotates to be aligned with the notch groove, the limiting portion can slide out of the notch groove to be released from the limitation.

[0015] Further, the outer walls of the nozzle, the injection pipe and the gas outlet joint are embedded with sealing rings in sealing fit with the inner wall of the mounting chamber.

[0016] The negative pressure generating mechanism and the mounting structure thereof have the following beneficial effects: in the first embodiment, the nozzle and the injection pipe are linked at least in the axial direction, so that the injection pipe can drive the nozzle to move when the injection pipe moves axially, when it is necessary to replace the negative pressure generating mechanism, positive pressure air with a higher pressure than the compressed gas required for negative pressure generation is introduced, and the nozzle is acted on by the positive pressure air, so that the negative pressure generating mechanism is pushed out of the vacuum generator, the nozzle is connected with the injection pipe, and after the injection pipe is pushed out, the nozzle can be pulled out together by only pulling the injection pipe outward, without stopping the air supply after the nozzle is pushed out of the vacuum generator and stopping the air supply after the injection pipe is pushed out, so that the replacement efficiency is high, and time and cost are saved.

[0017] On the basis of the first embodiment, the second embodiment is further provided, in which a gas outlet joint is arranged, the nozzle, the injection pipe and the gas outlet joint are connected in series, and the gas outlet joint is provided with a handle portion at an end away from the injection pipe, the handle portion extending outward of the vacuum generator, by arranging the handle portion, the negative pressure generating mechanism can be directly pulled out through the handle portion without introducing positive pressure air with a higher pressure than the compressed gas required for negative pressure generation, so that time and cost are further saved, and the replacement efficiency is higher.

[0018] When it is necessary to maintain or replace the negative pressure generating mechanism, the user can directly rotate the gas outlet joint through the handle portion to drive the negative pressure generating mechanism to rotate in the mounting chamber, when the limiting portion is rotated to be aligned with the notch groove, the negative pressure generating mechanism can be pulled out through the handle portion for cleaning and maintenance, when being installed, the negative pressure generating mechanism is inserted into the mounting chamber, the limiting portion is aligned with the notch groove and is inserted, and then the gas outlet joint and the negative pressure generating mechanism are driven by the handle portion to rotate in the mounting chamber, so that the limiting portion enters the limiting groove through the notch groove to play a limiting role, and the negative pressure generating mechanism is prevented from sliding out of the mounting chamber undesirably. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic view of the negative pressure generating mechanism.

[0020] Figure 2 is a sectional view of the negative pressure generating mechanism;

[0021] Figure 3 is an exploded view of the negative pressure generating mechanism;

[0022] Figure 4 is a structural view of the nozzle;

[0023] Figure 5 is a structural view of the negative pressure generating mechanism when connected with the air outlet connector;

[0024] Figure 6 is a structural view of the air outlet connector;

[0025] Figure 7 is a sectional view of the vacuum generator body;

[0026] Figure 8 is a structural view of the vacuum generator body;

[0027] Figure 9 is Figure 8 is an enlarged view of A in the figure.

[0028] Figure 1 - Figure 9 in the figure: 1, nozzle; 11, first connecting clamping protrusion; 2, ejector pipe; 21, primary ejector pipe; 211, first air inlet; 2111, primary diaphragm; 212, first connecting clamping groove; 213, second connecting clamping protrusion; 22, secondary ejector pipe; 221, second air inlet; 2211, secondary diaphragm; 222, second connecting clamping groove; 223, third connecting clamping protrusion; 3, ejector channel; 31, primary ejector channel; 32, secondary ejector channel; 4, air outlet connector; 41, air outlet; 42, third connecting clamping groove; 43, handle part; 44, limiting part; 5, vacuum generator body; 51, installation chamber; 511, limiting groove; 512, notch groove; 52, main body module; 521, gas channel; 522, air inlet channel; 53, pressure gauge; 54, control valve; 55, air inlet; 56, air outlet; 6, sealing ring. DETAILED DESCRIPTION

[0029] The utility model will be further explained in connection with the drawings.

[0030] As Figure 1 - Figure 6The negative pressure generating mechanism shown includes a nozzle 1 and an ejector pipe 2, the nozzle 1 is arranged at the air inlet end of the ejector pipe 2, the ejector pipe 2 is provided with an ejecting channel 3 corresponding to the nozzle 1, the gas passes through the ejecting channel 3 to generate vacuum, the side wall of the air inlet end of the ejector pipe 2 is provided with an air suction port in communication with the ejecting channel 3, so that the external air is sucked into the air suction port under the action of negative pressure, in the first embodiment, a first connecting structure is arranged in cooperation between the nozzle 1 and the ejector pipe 2, the nozzle 1 and the ejector pipe 2 constitute linkage at least in the axial direction through the first connecting structure, so that the ejector pipe 2 can drive the nozzle 1 to move together when the ejector pipe 2 moves axially, when it is necessary to replace the negative pressure generating mechanism, the positive pressure air with a higher pressure than the compressed gas required for negative pressure generation is introduced, and the nozzle 1 is acted on by the positive pressure air, so that the negative pressure generating mechanism is pushed out of the vacuum generator, the nozzle 1 is connected with the ejector pipe 2, after the ejector pipe 2 is pushed out, the nozzle 1 can be pulled out together by only pulling the ejector pipe 2 outward, without the need to stop air supply after the nozzle 1 is pushed out of the vacuum generator, and the air supply can be stopped after the ejector pipe 2 is pushed out, so that the replacement efficiency is high, time and cost are saved.

[0031] Preferably, in the embodiment, the first connecting structure includes a first connecting clamping convex 11 arranged on the nozzle 1 and a first connecting clamping groove 212 arranged at the air inlet end of the ejector pipe 2, the first connecting clamping groove 212 is in clamping cooperation with the first connecting clamping convex 11, the connection relationship is stable and not easy to disengage.

[0032] The number of the ejector pipes 2 can be one or multiple, preferably, in the embodiment, the ejector pipe 2 includes a first-stage ejector pipe 21 and a second-stage ejector pipe 22 in series along the axial direction, the nozzle 1 is connected to the air inlet end of the first-stage ejector pipe 21 through the first connecting structure, the air outlet end of the first-stage ejector pipe 21 is connected to the air inlet end of the second-stage ejector pipe 22, the ejecting channel 3 includes a first-stage ejecting channel 31 arranged in the first-stage ejector pipe 21 and a second-stage ejecting channel 32 arranged in the second-stage ejector pipe 22, the air suction port includes a first air suction port 211 arranged at the air inlet end of the first-stage ejector pipe 21 and a second air suction port 221 arranged at the air inlet end of the second-stage ejector pipe 22, the first air suction port 211 is in communication with the first-stage ejecting channel 31, and the second air suction port 221 is in communication with the second-stage ejecting channel 32, see Figure 2Preferably, in the embodiment, the nozzle 1 and the first ejector pipe 21 form a first negative pressure cavity, the first ejector pipe 21 and the second ejector pipe 22 form a second negative pressure cavity, the first air inlet 211 is in communication with the first negative pressure cavity, the second air inlet 221 is in communication with the second negative pressure cavity, and the gas forms a negative pressure in the first negative pressure cavity after passing through the first ejector channel 31, so that the external air is sucked into the first air inlet 211 under the action of the negative pressure to perform vacuumizing, the gas forms a negative pressure in the second negative pressure cavity after passing through the second ejector channel 32, so that the external air is sucked into the second air inlet 221 under the action of the negative pressure to perform vacuumizing, and the gas generates a secondary vacuum after passing through the first ejector channel 31 and then passing through the second ejector channel 32. Through the design of the double-vacuum structure, the flow rate of the product during vacuumizing is very large, and the speed of vacuumizing is faster and the efficiency is high.

[0033] Preferably, in the embodiment, the first ejector pipe 21 and the second ejector pipe 22 are cooperatively provided with a second connecting structure, the first ejector pipe 21 and the second ejector pipe 22 constitute linkage at least in the axial direction through the second connecting structure, and when the second ejector pipe 22 is pushed out, the first ejector pipe 21 and the nozzle 1 can be pulled out together by only pulling outward.

[0034] Preferably, in the embodiment, the second connecting structure includes a second connecting clamping convex 213 arranged at the gas outlet end of the first ejector pipe 21 and a second connecting clamping groove 222 arranged at the gas inlet end of the second ejector pipe 22, the second connecting clamping groove 222 and the second connecting clamping convex 213 are in clamping cooperation, and the connection relationship is stable and not easy to disengage.

[0035] On the basis of the first embodiment, a second embodiment is further provided, in which, referring to Figure 5 - Figure 6 Further including a gas outlet connector 4 arranged at the gas outlet end of the ejector pipe 2, the gas outlet connector 4 is provided with a gas outlet 41 in communication with the ejector channel 3, the gas outlet 41 is in communication with the atmosphere, and the ejector pipe 2 and the gas outlet connector 4 are cooperatively provided with a third connecting structure, the ejector pipe 2 and the gas outlet connector 4 constitute linkage at least in the axial direction through the third connecting structure, and when the gas outlet connector 4 is pushed out, the ejector pipe 2 and the nozzle 1 can be pulled out together by only pulling outward, and less gas is used, time and cost are saved.

[0036] Preferably, in the embodiment, the third connecting structure includes a third connecting clamping convex 223 arranged at the gas outlet end of the ejector pipe 2 and a third connecting clamping groove 42 arranged at the gas outlet connector 4, the third connecting clamping groove 42 and the third connecting clamping convex 223 are in clamping cooperation, and the connection relationship is stable and not easy to disengage.

[0037] Preferably, in the embodiment, the end of the gas outlet joint 4 away from the ejector pipe 2 is provided with a handle part 43, which extends out of the vacuum generator. By providing the handle part 43, the negative pressure generating mechanism can be directly pulled out through the handle part 43 without the need of additional positive pressure air with a pressure higher than the required pressure of the compressed gas for negative pressure generation, thereby further saving time and cost and improving the efficiency of replacement.

[0038] Based on the above-mentioned negative pressure generating mechanism, a negative pressure generating mechanism installation structure is also provided, as shown in Figure 7 Figure 9 The installation structure of the negative pressure generating mechanism comprises a vacuum generator body 5 and a negative pressure generating mechanism. The vacuum generator body 5 is provided with a mounting chamber 51, and the negative pressure generating mechanism is inserted into the mounting chamber 51. The gas outlet joint 4 is locked with the vacuum generator body 5 to avoid the gas outlet joint 4 from being undesirably separated from the vacuum generator body 5 in the working state, thereby affecting the use.

[0039] The vacuum generator is provided with an air inlet 55 and an air outlet 56. The vacuum generator is provided with a gas passage 521. The air inlet 55 is connected in communication with the air inlet end of the nozzle 1 through the gas passage 521. Specifically, the vacuum generator comprises a main module 52, a control valve 54 and a pressure gauge 53. The control valve 54 and the pressure gauge 53 are connected to the main module 52. The control valve 54 is used to control the opening and closing of the gas passage 521, thereby controlling the working of the negative pressure generating mechanism. The pressure gauge 53 is used to detect the pressure in the vacuum generator to ensure that it works within a reasonable pressure range. The mounting chamber 51 is arranged in the main module 52. The main module 52 is further provided with a suction passage 522. A first-stage diaphragm 2111 is arranged on the first suction port 211. A second-stage diaphragm 2211 is arranged on the second suction port 221. The first suction port 211 is connected in communication with the suction passage 522 through the first-stage diaphragm 2111. The second suction port 221 is connected in communication with the suction passage 522 through the second-stage diaphragm 2211.

[0040] Preferably, in the embodiment, referring to Figure 6 , the side wall of the gas outlet joint 4 is radially outwardly extended to be provided with a limiting part 44. Referring to Figure 8 Figure 9 The inner wall of the mounting chamber 51 is circumferentially provided with a limiting groove 511 in sliding cooperation with the limiting part 44. The inner wall of the mounting chamber 51 is further provided with a notch groove 512 in communication with the limiting groove 511. The notch groove 512 extends outwardly along the axial direction of the mounting chamber 51. When the gas outlet joint 4 rotates relative to the mounting chamber 51, the limiting part 44 rotates in the limiting groove 511. When the limiting part 44 rotates to be aligned with the notch groove 512, the limiting part 44 can slide out of the notch groove 512 to be released from the limitation. ​​

[0041] When the negative pressure generating mechanism needs to be repaired or replaced, the user can directly screw out the gas joint 4 by the handle part 43 to drive the negative pressure generating mechanism to rotate in the installation chamber 51, when the limiting part 44 rotates to align with the notch groove 512, the negative pressure generating mechanism can be pulled out through the handle part 43 for cleaning and maintenance; when installing, the negative pressure generating mechanism is inserted into the installation chamber 51, and then the limiting part 44 is inserted into the installation chamber 51 in alignment with the notch groove 512, and then the gas joint 4 and the negative pressure generating mechanism are rotated in the installation chamber 51 through the handle part 43, so that the limiting part 44 enters the limiting groove 511 through the notch groove 512, thereby limiting the negative pressure generating mechanism from sliding out of the installation chamber 51.

[0042] Preferably, in the embodiment, the outer walls of the nozzle 1, the injection pipe 2 and the gas outlet joint 4 are embedded with sealing rings 6 in sealing cooperation with the inner walls of the installation chamber 51, to prevent air leakage, and specifically, the sealing ring 6 is an "O" ring.

[0043] The above is only a preferred embodiment of the present application, so equivalent changes or modifications made according to the structure, features and principles described in the patent application range of the present application are included in the patent application range of the present application.

Claims

1. A negative pressure generating mechanism, comprising a nozzle (1) and an ejector tube (2), wherein the nozzle (1) is disposed at the air inlet end of the ejector tube (2), the ejector tube (2) is provided with an ejector channel (3) corresponding to the nozzle (1), and the side wall of the air inlet end of the ejector tube (2) is provided with an air intake port communicating with the ejector channel (3), characterized in that: The first connecting structure is arranged between the nozzle (1) and the injection pipe (2), and the nozzle (1) and the injection pipe (2) are connected in linkage at least in the axial direction through the first connecting structure.

2. The negative pressure generating mechanism according to claim 1, characterized in that: The first connecting structure comprises a first connecting clamping convex (11) arranged on the nozzle (1) and a first connecting clamping groove (212) arranged on the air inlet end of the injection pipe (2), and the first connecting clamping groove (212) is in clamping connection with the first connecting clamping convex (11).

3. The negative pressure generating mechanism of claim 1, wherein: The injection pipe (2) comprises a first-stage injection pipe (21) and a second-stage injection pipe (22) connected in series in the axial direction, the nozzle (1) is connected to the air inlet end of the first-stage injection pipe (21) through the first connecting structure, the air outlet end of the first-stage injection pipe (21) is connected to the air inlet end of the second-stage injection pipe (22), the injection channel (3) comprises a first-stage injection channel (31) arranged in the first-stage injection pipe (21) and a second-stage injection channel (32) arranged in the second-stage injection pipe (22), the air inlet comprises a first air inlet (211) arranged on the air inlet end of the first-stage injection pipe (21) and a second air inlet (221) arranged on the air inlet end of the second-stage injection pipe (22), the first air inlet (211) is in communication with the first-stage injection channel (31), the second air inlet (221) is in communication with the second-stage injection channel (32), and the second connecting structure is arranged between the first-stage injection pipe (21) and the second-stage injection pipe (22), and the first-stage injection pipe (21) and the second-stage injection pipe (22) are connected in linkage at least in the axial direction through the second connecting structure.

4. A negative pressure generating mechanism according to claim 3, wherein: The second connecting structure comprises a second connecting clamping convex (213) arranged on the air outlet end of the first-stage injection pipe (21) and a second connecting clamping groove (222) arranged on the air inlet end of the second-stage injection pipe (22), and the second connecting clamping groove (222) is in clamping connection with the second connecting clamping convex (213).

5. The negative pressure generating mechanism of claim 1, wherein: The air outlet connector (4) is arranged on the air outlet end of the injection pipe (2), the air outlet connector (4) is provided with an air outlet (41) in communication with the injection channel (3), the third connecting structure is arranged between the injection pipe (2) and the air outlet connector (4), and the injection pipe (2) and the air outlet connector (4) are connected in linkage at least in the axial direction through the third connecting structure.

6. A negative pressure generating mechanism according to claim 5, wherein: The third connecting structure comprises a third connecting clamping convex (223) arranged on the air outlet end of the injection pipe (2) and a third connecting clamping groove (42) arranged on the air outlet connector (4), and the third connecting clamping groove (42) is in clamping connection with the third connecting clamping convex (223).

7. The negative pressure generating mechanism of claim 5, wherein: The end of the air outlet connector (4) away from the injection pipe (2) is provided with a handle part (43).

8. A mounting structure of a negative pressure generating mechanism comprising a vacuum generator body (5), characterized by: The negative pressure generating mechanism as claimed in any one of claims 5 to 7 is further comprised, the vacuum generator body (5) is provided with a mounting chamber (51), the negative pressure generating mechanism is inserted into the mounting chamber (51), and the air outlet connector (4) is in locking connection with the vacuum generator body (5).

9. The mounting structure of a negative pressure generating mechanism according to claim 8, characterized by: The side wall of the air outlet joint (4) extends radially outward and is provided with a limiting portion (44), the inner wall of the mounting cavity (51) is provided with a limiting groove (511) in sliding fit with the limiting portion (44) in the circumferential direction, and the inner wall of the mounting cavity (51) is further provided with a notch groove (512) in communication with the limiting groove (511) and extending outward in the axial direction of the mounting cavity (51), when the air outlet joint (4) rotates relative to the mounting cavity (51), the limiting portion (44) rotates in the limiting groove (511), and when the limiting portion (44) rotates to be aligned with the notch groove (512), the limiting portion (44) can slide out of the notch groove (512) to be released from the limitation.

10. The mounting structure of a negative pressure generating mechanism according to claim 8, characterized by: The outer walls of the nozzle (1), the injection pipe (2) and the air outlet joint (4) are embedded with sealing rings (6) in sealing fit with the inner wall of the mounting cavity (51).

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