Exhaust pressure pulsation adjusting device for vacuum unit and vacuum unit thereof

Abstract

The present application relates to the technical field of vacuum unit, in particular to an exhaust pressure pulsation adjusting device for vacuum unit and vacuum unit thereof, which comprises an outer shell and an adjusting mechanism. The adjusting mechanism comprises a cylindrical structural member and an adjusting buffer body. A second air flow channel is formed between the air inlet end, the inner cavity and the communication hole of the cylindrical structural member. The adjusting buffer body is arranged in the inner cavity of the cylindrical structural member, and the adjusting buffer body divides the cylindrical structural member into a buffer zone and a pneumatic buffer zone. In the exhaust process, the adjusting buffer body is used to separate the air flow channel according to the pressure difference between the buffer zone and the pneumatic buffer zone, so that the impact and force on the pipeline are small. When the exhaust pressure is too large, the adjusting buffer body can also perform shock absorption, so as to achieve the purpose of adjusting the exhaust pressure pulsation. The exhaust pressure pulsation adjusting device has the characteristics of small space volume, good sealing performance and simple structure.

Description

Technical Field

[0001] This invention relates to the field of vacuum unit technology, and in particular to an exhaust pressure pulsation regulating device for vacuum units and the vacuum unit thereof. Background Technology

[0002] Vacuum units, as devices for creating a vacuum state, are widely used in various industrial fields. A vacuum unit consists of multiple vacuum devices connected by pipelines. Each vacuum device includes a vacuum pump, valves, piping, and a control system. The vacuum pump has an inlet pipe connected to a container (or the exhaust pipe of an adjacent vacuum pump) and an exhaust pipe that discharges gas towards the adjacent vacuum pump (or the outside), thereby reducing the gas pressure inside the container and creating the required vacuum environment. The intake, compression, and exhaust processes experience periodic fluctuations in flow rate as the intake pressure decreases, resulting in exhaust pressure pulsations. Because a vacuum unit operates within a closed space—that is, integrating multiple vacuum devices into one enclosed space—the airflow pulsations during operation not only reduce the unit's volumetric efficiency and increase power consumption, but also exert periodic forces on the walls and pipes of the vacuum unit when the gas pressure changes rapidly within the enclosed space, inducing vibration and noise. In severe cases, this can affect the fatigue life of the pipelines between adjacent vacuum devices. Summary of the Invention

[0003] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides an exhaust pressure pulsation regulating device for vacuum units, which solves the technical problem that vibration and noise induced by exhaust pressure pulsation of vacuum units can seriously affect the fatigue life of pipelines between adjacent vacuum equipment.

[0004] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0005] In a first aspect, embodiments of the present invention provide an exhaust pressure pulsation regulating device for a vacuum unit, comprising an outer housing with its two ends respectively connected to the exhaust port and a pipe of the vacuum unit, and an regulating mechanism disposed within the outer housing and fixedly connected to the outer housing;

[0006] The adjustment mechanism includes a cylindrical structural component coaxially arranged with the outer shell and closed at both ends, and an adjustment buffer body;

[0007] A first airflow channel, which is connected to the pipe, is formed between the outer wall of the cylindrical structural member and the inner wall of the outer shell.

[0008] One end of the cylindrical structure is provided with an air inlet end that communicates with its inner cavity. A connecting hole is provided on the circumferential side wall of the cylindrical structure that communicates with the inner cavity of the cylindrical structure. A second airflow channel is formed between the air inlet end, the inner cavity of the cylindrical structure and the connecting hole.

[0009] The adjusting buffer body is disposed in the inner cavity of the cylindrical structure, and the connecting hole is located between the adjusting buffer body and the air inlet. The adjusting buffer body divides the cylindrical structure into two parts: a buffer zone and a pneumatic buffer zone.

[0010] During the exhaust process, the adjusting buffer body can move along the axial direction of the cylindrical structure toward / away from the connecting hole to open / close the connecting hole. Based on the pressure difference between the buffer and the pneumatic buffer, it can be selectively determined whether the second airflow channel is connected to the first airflow channel.

[0011] When the connecting hole is opened and the second airflow channel is connected to the first airflow channel, the adjusting buffer body can also perform shock absorption and buffering according to the exhaust pressure of the exhaust port.

[0012] Optionally, the adjustment mechanism further includes an annular cylindrical wall that extends axially toward the adjustment buffer body along the air inlet end and an extension sleeve with a sealing end face sleeved outside the annular cylindrical wall. A serpentine extension channel is formed between the annular cylindrical wall, the extension sleeve, and the inner wall of the cylindrical structure. A buffer zone is formed between the sealing end face of the extension sleeve and the adjustment buffer body. The serpentine extension channel, the buffer zone, and the connecting hole form the second airflow channel.

[0013] Optionally, the radial opening width of the air inlet is greater than the radial opening width of the first airflow channel.

[0014] Optionally, the ratio of the radial opening width of the air intake end to the radial opening width of the first airflow channel is 5-6:1.

[0015] Optionally, the adjusting buffer body includes a spring and a piston cylinder;

[0016] An adjustment hole communicating with the outside is provided on the outer wall of one end of the cylindrical structure near the pipe. The adjustment hole passes through the cylindrical structure and the outer shell and communicates with the outside.

[0017] The piston cylinder is disposed at one end of the cylindrical structure near the pipe, and an adjustable buffer zone is formed between the end face of the piston cylinder and the end face of the extension sleeve. A pneumatic buffer zone is formed between the piston cylinder and the inner wall of the end face of the cylindrical structure near the pipe, and the pneumatic buffer zone is connected to the adjustment hole.

[0018] The spring is disposed in the pneumatic buffer zone, with one end of the spring abutting against the inner wall of one end face of the pipe and the other end abutting against the piston cylinder. When the exhaust pressure changes, the pressure difference between the pneumatic buffer zone and the buffer zone changes, and the connecting hole is opened / closed by the compression and release of the spring.

[0019] Optionally, the piston cylinder includes an abutting end face, a first cylinder wall, and a second cylinder wall extending relative to both sides of the abutting end face;

[0020] The first cylindrical wall is used to close the communicating hole, and the second cylindrical wall and the abutting end face form an abutting space for accommodating the spring.

[0021] Optionally, the adjustment mechanism further includes a gas regulator that is connected to the pneumatic buffer and is capable of adjusting the buffering force of the pneumatic buffer according to the exhaust pressure of the exhaust port.

[0022] When the exhaust pressure at the exhaust port is above the external atmospheric pressure, the gas regulator inflates the pneumatic buffer zone through the adjustment hole to increase the pressure of the pneumatic buffer zone.

[0023] When the exhaust pressure at the exhaust port is below the external atmospheric pressure, the gas regulator draws a vacuum through the regulating orifice to reduce the pressure in the pneumatic buffer zone.

[0024] Optionally, the outer shell and the cylindrical structural member are connected by a fixing rib.

[0025] Optionally, both the air inlet and exhaust ends of the housing are KF vacuum connectors, and the housing is detachably connected to the exhaust port of the vacuum unit and the air inlet of the pipe through the KF vacuum connectors.

[0026] On the other hand, a vacuum unit includes multiple vacuum devices, an exhaust pressure pulsation regulating device for the vacuum unit, and pipelines. The exhaust pressure pulsation regulating device for the vacuum unit is disposed at the exhaust port of the vacuum device, and adjacent vacuum devices are connected in sequence through the exhaust pressure pulsation regulating device and pipelines.

[0027] The beneficial effects of this invention are as follows: This invention provides an exhaust pressure pulsation regulating device for vacuum units. It is installed between the exhaust port and the pipeline of the vacuum equipment. Specifically, the gas inside the vacuum equipment passes through a first airflow channel formed between the outer sleeve and the cylindrical structure of the regulating mechanism, and a second airflow channel formed by the cylindrical structure itself. During the exhaust process, based on the pressure difference between the buffer zone and the pneumatic buffer zone, it can selectively determine whether the second airflow channel is connected to the first airflow channel. This adaptively utilizes the regulating buffer body to separate the airflow channels. Furthermore, the airflow channels can be selectively used, resulting in less impact and force on the pipeline. Further, when the exhaust pressure is too high, the connecting hole opens, and when the second airflow channel connects to the first airflow channel, the regulating buffer body can also provide shock absorption. By establishing a buffer chamber, the purpose of regulating exhaust pressure pulsation can be achieved, solving the problem of vibration and noise induced by exhaust pressure pulsation in vacuum units. In addition, the exhaust pressure pulsation regulating device has the characteristics of small size, good sealing, and simple structure. It is not only easy to manufacture and install, but also has vibration reduction and noise reduction effects, thereby ensuring the service life of the pipeline. Attached Figure Description

[0028] Figure 1 This is a cross-sectional three-dimensional structural diagram of the exhaust pressure pulsation regulating device for vacuum units according to the present invention;

[0029] Figure 2 for Figure 1 A schematic diagram of the planar structure (with the connecting hole open);

[0030] Figure 3 for Figure 1 A schematic diagram of the planar structure (with the connecting hole closed);

[0031] Figure 4 This is a static vector cloud diagram showing the pressure stability of the exhaust pressure pulsation regulating device for a vacuum unit according to the present invention (exhaust pressure is greater than the pneumatic buffer zone pressure);

[0032] Figure 5 for Figure 4 A magnified diagram of the buffer zone;

[0033] Figure 6 For pressure stabilization static vector cloud diagram (exhaust pressure is less than the set pneumatic buffer pressure);

[0034] Figure 7 To simulate the first state of the aerodynamic buffer zone;

[0035] Figure 8 To simulate the second state of the aerodynamic buffer zone;

[0036] Figure 9This is to simulate the third state of the aerodynamic buffer zone.

[0037] Explanation of reference numerals in the attached figures

[0038] 1: Outer shell;

[0039] 2: Adjustment mechanism; 21: Cylindrical structural component; 211: Air inlet end; 212: Connecting hole; 213: Adjustment hole; 22: Adjustment buffer body; 221: Spring; 222: Piston cylinder; 2221: Abutting end face; 2222: First cylinder wall; 2223: Second cylinder wall; 23: First airflow channel; 24: Second airflow channel; 25: Buffer zone; 26: Pneumatic buffer zone; 27: Annular cylinder wall; 28: Extension sleeve;

[0040] 3: KF vacuum connector. Detailed Implementation

[0041] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0042] See appendix Figure 1-3 As shown in the figure, an embodiment of the present invention proposes a vacuum unit, including multiple vacuum devices, an exhaust pressure pulsation regulating device for the vacuum unit, and pipelines. The exhaust pressure pulsation regulating device for the vacuum unit is disposed at the exhaust port of the vacuum devices, and adjacent vacuum devices are connected sequentially through the exhaust pressure pulsation regulating device and pipelines. The exhaust pressure pulsation regulating device for the vacuum unit includes an outer shell 1 with both ends connected to the exhaust port of the vacuum unit and the pipeline, respectively, and an adjusting mechanism 2 disposed inside the outer shell 1 and fixedly connected to the outer shell 1. The adjusting mechanism 2 includes a cylindrical structural member 21 coaxially disposed with the outer shell 1 and closed at both ends, and an adjusting buffer body 22. A first airflow channel 23 communicating with the pipeline is formed between the outer wall of the cylindrical structural member 21 and the inner wall of the outer shell 1. One end of the cylindrical structural member 21 has an air inlet 211 communicating with its inner cavity. A connecting hole 212 communicating with the inner cavity of the cylindrical structural member 21 is formed on its circumferential sidewall. A second airflow channel 24 is formed between the air inlet 211, the inner cavity of the cylindrical structural member 21, and the connecting hole 212. An adjusting buffer body 22 is disposed within the inner cavity of the cylindrical structural member 21, and the connecting hole 212 is located between the adjusting buffer body 22 and the air inlet 211. The adjusting buffer body 22 divides the cylindrical structural member 21 into two parts: a buffer zone 25 and a pneumatic buffer zone 26.

[0043] During the exhaust process, the adjusting buffer body 22 can move along the axial direction of the cylindrical structure 21 toward / away from the connecting hole 212 to open / close the connecting hole 212. Based on the pressure difference between the buffer 25 and the pneumatic buffer 26, it can be selectively determined whether the second airflow channel 24 is connected to the first airflow channel 23.

[0044] Specifically, the piston cylinder 222, under the action of the gas pressure difference between the buffer zone 25 and the pneumatic buffer zone 26, closes and opens the communication hole by means of a spring.

[0045] When the gas pressure in the buffer zone 25 is less than or equal to that in the pneumatic buffer zone 26, the spring 221 maintains a stationary state due to its elastic force, and the piston cylinder 222 closes the passage between the buffer zones 25. The gas entering the second airflow channel 24 cannot pass through the buffer zone 25 and merge with the gas in the first airflow channel 23.

[0046] When the gas pressure in the buffer zone 25 is greater than that in the pneumatic buffer zone 26, the spring 221 maintains a compressed state. The air pressure compresses the spring 221, causing the piston cylinder 222 to open the communication hole between the first airflow channel 23 and the buffer zone 25. The gas enters the second airflow channel 24, passes through the buffer zone 25, and merges with the gas in the first airflow channel 23.

[0047] When the connecting hole 212 is opened and the second airflow channel 24 is connected to the first airflow channel 23, the adjusting buffer body 22 can also perform shock absorption and buffering according to the exhaust pressure of the exhaust port.

[0048] This invention discloses an exhaust pressure pulsation regulating device for a vacuum unit. It is installed between the exhaust port and the pipeline of the vacuum equipment. Specifically, the gas inside the vacuum equipment passes through a first airflow channel 23 formed between the outer sleeve and the cylindrical structure of the regulating mechanism, and a second airflow channel 24 formed by the cylindrical structure itself. During the exhaust process, the device can selectively determine whether the second airflow channel 24 is connected to the first airflow channel 23 based on the pressure difference between the buffer zone 25 and the pneumatic buffer zone 26. This adaptively utilizes the regulating buffer body 22 to separate the airflow channels. Furthermore, the airflow channels can be selectively used, resulting in less impact and force on the pipeline. Additionally, when the exhaust pressure is too high, the connecting hole 212 opens, connecting the second airflow channel 24 to the first airflow channel 23. The regulating buffer body 22 can also provide shock absorption and buffering. By establishing a buffer chamber, the device can regulate the exhaust pressure pulsation, thus solving the problem of vibration and noise induced by the exhaust pressure pulsation of the vacuum unit. Furthermore, the exhaust pressure pulsation regulating device features small size, good sealing, and simple structure. It is not only easy to manufacture and install, but also provides vibration reduction and noise reduction, thus ensuring the service life of the pipeline. Existing silencers reduce noise using sound-absorbing materials (such as glass wool and rock wool) and special structures (such as expansion chambers and resonant cavities), meaning the silencer's pressure is fixed and cannot be adjusted. Compared to existing silencers, in this embodiment, the exhaust pressure pulsation regulating device adjusts the gas flow state and pressure changes to reduce pressure pulsation, while simultaneously making the pressure of the gas system more stable. Large buffer tanks are connected externally to the vacuum unit equipment and occupy a large volume. Compared to large buffer tanks, this embodiment eliminates structural limitations and can be directly connected between the pipeline and the exhaust port.

[0049] Furthermore, the regulating mechanism 2 also includes an annular cylindrical wall 27 extending axially along the air inlet end 211 toward the regulating buffer body 22, and an extension sleeve 28 with a sealing end face sleeved outside the annular cylindrical wall 27. A serpentine extension channel is formed between the annular cylindrical wall 27, the extension sleeve 28, and the inner wall of the cylindrical structure 21. A buffer zone 25 is formed between the sealing end face of the extension sleeve 28 and the regulating buffer body 22. The serpentine extension channel, the buffer zone 25, and the connecting hole 212 form a second airflow channel 24. In this embodiment, two flow channels, the first airflow channel 23 and the second airflow channel 24, and a buffer chamber are designed. By optimizing the length difference between the two channels, the time difference between the pressure pulsation in the first airflow channel 23 and the pressure pulsation in the second airflow channel 24 can be changed, allowing the pressure pulsation to enter the buffer chamber. The buffer chamber adjusts the air pressure of the pneumatic buffer zone 26 by changing the pneumatic control to meet the user's current needs.

[0050] Furthermore, the radial opening width of the air intake end 211 is greater than the radial opening width of the first airflow channel 23. Furthermore, the ratio of the radial opening width of the air intake end 211 to the radial opening width of the first airflow channel 23 is 5-6:1. The first airflow channel 23 directly connects to the duct, and the second airflow channel 24 connects to the duct after passing through the buffer zone 25.

[0051] In this embodiment, the width of the second airflow channel 24 is much larger than that of the first airflow channel 23. According to the gas kinetic theory, gas passes through the second airflow channel 24 more easily. The gas in the second airflow channel 24 undergoes buffering within the buffer zone 25 and then merges with the gas in the first airflow channel 23 through the connecting hole.

[0052] Furthermore, the adjustable buffer body 22 includes a spring 221 and a piston cylinder 222. A connecting hole 212 divides the cylindrical structure 21 into a buffer zone 25 near the exhaust port and a pneumatic buffer zone 26 near the pipe. An adjusting hole 213, communicating with the outside, is provided on the outer wall of the cylindrical structure 21 at the end near the pipe. The adjusting hole 213 passes through the cylindrical structure 21 and the outer shell 1 to communicate with the outside. The piston cylinder 222 is located at the end of the cylindrical structure 21 near the pipe, and an adjustable buffer zone 25 is formed between the end face of the piston cylinder 222 and the end face of the extension sleeve 28. A pneumatic buffer zone 26 is formed between the piston cylinder 222 and the inner wall of the end face of the cylindrical structure 21 near the pipe, and the pneumatic buffer zone 26 is connected to the adjusting hole 213. Spring 221 is disposed in pneumatic buffer zone 26, with one end of spring 221 abutting against the inner wall of one end face of pipe and the other end abutting against piston cylinder 222. When the exhaust pressure changes, the pressure difference between pneumatic buffer zone 26 and buffer zone 25 changes. Through the compression and release of spring 221, gas energy is consumed to open / close communication hole 212.

[0053] Specifically, a closed vacuum unit exhaust pressure pulsation regulating device includes an outer shell, an inner channel sleeve, a buffer chamber, a pneumatic buffer zone 26, a connecting hole, a piston cylinder 222, and a spring. The inner sleeve divides the airflow channel into a first airflow channel 23 and a second airflow channel 24. The second airflow channel 24 is an extended air path channel, and the first airflow channel 23 is the initial passage. By using the separated air path channels to establish a buffer chamber, the device can balance the buffer zone pressure with the exhaust pressure during operation, based on the principles of pneumatic damping and acoustic interference theory. Exhaust pressure fluctuations are offset by the compression and relaxation of the spring, thereby regulating exhaust pressure pulsation and solving the problem of vibration and noise induced by exhaust pressure pulsation in the vacuum unit.

[0054] In this embodiment, when the exhaust pressure changes, the pressure difference between the gas buffer zone and buffer zone 25 changes, and the compression and relaxation process of spring 221 consumes gas energy, thus playing a buffering role. When the exhaust pressure increases, the pressure difference between the gas buffer zone and buffer zone 25 increases, and the elastic force of spring 221 increases, reducing gas impact. When the exhaust pressure decreases, the pressure difference between gas buffer zone 26 and buffer zone 25 decreases, the elastic force of spring 221 decreases, and the buffering effect weakens. When the exhaust pressure increases, the pressure difference between the gas buffer zone and buffer zone 25 increases, the elastic force of spring 221 increases, and the buffering effect increases. Initially, the gas buffer zone is at atmospheric pressure. At this time, spring 221 is not compressed and remains stationary. Piston cylinder 222 blocks the connecting hole 212 to close the first airflow channel 23 and the second airflow channel 24 (see...). Figure 3 (As shown). When connected to the pipeline, the exhaust pressure at the vacuum exhaust port continuously increases. At this time, the pressure difference between the gas buffer zone 26 and buffer zone 25 increases, the spring force of spring 221 increases, and the piston cylinder 222 moves downward to open the connecting hole, allowing airflow to simultaneously enter the first airflow channel 23 and the second airflow channel 24. When the pressure at the vacuum exhaust port decreases, the pressure difference between the gas buffer zone and buffer zone 25 increases, the spring force of spring 221 increases, and the piston cylinder 222 moves downward to seal the connecting hole, closing the first airflow channel 23 and the second airflow channel 24. This automatically adapts to pressure fluctuations (buffering for high pressures and allowing airflow through the first airflow channel 23 without buffering for low pressures). Further, the piston cylinder 222 includes an abutment end face 2221, a first cylinder wall 2222 extending from both sides of the abutment end face 2221, and a second cylinder wall 2223. The first cylinder wall 2222 is used to close the connecting hole 212, and the second cylinder wall 2223 and the abutment end face 2221 form an abutment space for accommodating the spring 221.

[0055] Furthermore, the regulating mechanism 2 also includes a gas regulator that is connected to the pneumatic buffer 26 and is capable of adjusting the buffering force of the pneumatic buffer 26 according to the exhaust pressure of the exhaust port.

[0056] Specifically, when the exhaust pressure at the exhaust port is above the external atmospheric pressure, the gas regulator inflates the pneumatic buffer zone 26 through the adjustment port 213 to increase the pressure of the pneumatic buffer zone 26. When the exhaust pressure at the exhaust port is below the external atmospheric pressure, the gas regulator evacuates the pneumatic buffer zone 26 through the adjustment port 213 to reduce the pressure of the pneumatic buffer zone 26.

[0057] Furthermore, the outer shell 1 and the cylindrical structural member 21 are connected by a fixing rib, which facilitates product installation and molding.

[0058] Furthermore, both the air inlet end 211 and the exhaust end of the outer casing 1 are KF vacuum connectors 3, and the outer casing 1 is detachably connected to the exhaust port of the vacuum unit and the air inlet of the pipeline via the KF vacuum connectors 3. The design of KF vacuum connectors at the air inlet and exhaust ends of the outer casing 1 facilitates the connection of pipelines.

[0059] See Figure 4-9 This is a simulation verification of the exhaust pressure pulsation regulation device used in the vacuum unit in this embodiment.

[0060] Specifically Figure 4-5 As shown, this is a static cloud diagram illustrating the stable operation caused by the compression of spring 221 due to the exhaust pressure exceeding the pressure of the pneumatic buffer zone. This verifies the gas dynamics theory, showing that gas passes more easily through the second airflow channel 24 when the connecting hole 212 is open. During the buffering process of buffer zone 25, most of the gas undergoes energy dissipation through vortexing before merging with the first airflow channel 23, while a small portion of the gas passes directly through the connecting hole 212.

[0061] Figure 6 For the pressure stabilization static vector cloud diagram (exhaust pressure is less than the set pneumatic buffer pressure), at this time, the exhaust pressure is less than the set pneumatic buffer pressure, the connecting hole 212 is not connected, and the gas only passes through the first airflow channel 23.

[0062] In this embodiment, Figure 7 To simulate the function of the buffer zone 25 created by the pneumatic buffer zone 26, a pressure outlet is set at the position of the piston cylinder 222. For example... Figure 7 The simulated pneumatic buffer zone is set to a pressure inlet of 10000 Pa and a pressure outlet of 8000 Pa. In this case, the pressure in the pneumatic buffer zone is considered to be 8000 Pa. When the pressure in the pneumatic buffer zone 26 is less than the exhaust pressure, gas accumulates there and impacts the buffer zone. This indicates that in this situation, the piston cylinder 222 gradually opens the connecting hole 212, increasing the pressure in the pneumatic buffer zone 26.

[0063] The pressure in buffer zone 25 increases to 10000 Pa under the compression of spring 221, and the pressure in pneumatic buffer zone 26 equals the exhaust pressure, as shown in the following figure. Figure 8 As shown.

[0064] like Figure 8 As shown, when the exhaust pressure is equal to the pressure of the pneumatic buffer zone 26, the gas no longer impacts the pneumatic buffer zone 26 and is discharged normally.

[0065] like Figure 9As shown, the pneumatic buffer zone pressure is set to 10000 Pa, and the pressure inlet is 8000 Pa. At this time, gas backflows from the pneumatic buffer zone 26 into the buffer zone 25. This indicates that when the exhaust pressure is less than the pressure of the pneumatic buffer zone 26, the piston cylinder 222 will gradually reduce the opening of the connecting hole 212, and the pressure of the pneumatic buffer zone 26 will decrease, making the pressure of the pneumatic buffer zone 26 equal to the exhaust pressure.

[0066] pass Figure 7 , Figure 8 , Figure 9 The static process is used to describe the dynamic process during exhaust, and the situation at each key position is explained. It should be noted that the exhaust pressure of the vacuum unit is a fluctuating process, and the exhaust pressure pulsation adjustment device for the vacuum unit in this embodiment can adjust itself at different exhaust pressures to buffer the gas.

[0067] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0068] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0069] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0070] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An exhaust pressure pulsation regulating device for a vacuum set, characterized by: The adjusting mechanism (2) comprises a cylindrical structural member (21) coaxially arranged with the outer shell (1) and closed at both ends, and an adjusting and buffering body (22); The cylindrical structural member (21) is arranged in the outer shell (1) and is fixedly connected with the outer shell (1); The first gas flow channel (23) is formed between the outer wall of the cylindrical structural member (21) and the inner wall of the outer shell (1) and is connected with the pipeline; The second gas flow channel (24) is formed between the air inlet end (211), the inner cavity of the cylindrical structural member (21) and the communication hole (212); The adjusting and buffering body (22) is arranged in the inner cavity of the cylindrical structural member (21), and the communication hole (212) is located between the adjusting and buffering body (22) and the air inlet end (211); the adjusting and buffering body (22) divides the cylindrical structural member (21) into a buffering zone (25) and a pneumatic buffering zone (26); During the exhaust process, the adjusting and buffering body (22) can move along the axial direction of the cylindrical structural member (21) to move towards or away from one side of the communication hole (212) to open or close the communication hole (212); whether the second gas flow channel (24) is connected with the first gas flow channel (23) can be selectively determined according to the pressure difference between the buffering zone (25) and the pneumatic buffering zone (26); When the exhaust pressure is too large, the communication hole (212) is opened, the second gas flow channel (24) is connected with the first gas flow channel (23), and the adjusting and buffering body (22) can also perform shock absorption and buffering.

2. The exhaust pressure pulsation adjusting device for a vacuum pump set according to claim 1, characterized by: The adjusting mechanism (2) further comprises an annular cylindrical wall (27) capable of extending along the air inlet end (211) in the axial direction towards one side of the adjusting and buffering body (22), and an extension sleeve (28) with a blocking end face arranged outside the annular cylindrical wall (27); a serpentine extension channel is formed between the annular cylindrical wall (27), the extension sleeve (28) and the inner wall of the cylindrical structural member (21); a buffering zone (25) is formed between the blocking end face of the extension sleeve (28) and the adjusting and buffering body (22); and the serpentine extension channel, the buffering zone (25) and the communication hole (212) form the second gas flow channel (24).

3. The exhaust pressure pulsation adjusting device for a vacuum pump set according to claim 2, characterized by: The radial opening width of the air inlet end (211) is greater than the radial opening width of the first gas flow channel (23).

4. The exhaust pressure pulsation adjusting device for a vacuum pump set according to claim 3, characterized by: The ratio of the radial opening width of the air inlet end (211) to the radial opening width of the first gas flow channel (23) is 5-6:

1.

5. The exhaust pressure pulsation adjusting device for a vacuum pump set according to claim 2, characterized by: The adjusting and buffering body (22) comprises a spring (221) and a piston cylinder (222); An adjusting hole (213) is formed in the outer wall of the end of the cylindrical structural member (21) close to the pipeline, and the adjusting hole (213) communicates with the outside through the cylindrical structural member (21) and the outer shell (1); The piston cylinder (222) is arranged at the end of the cylindrical structural member (21) close to the pipeline, and the end face of the piston cylinder (222) and the end face of the extension sleeve (28) form a space-adjustable buffer area (25), and the piston cylinder (222) and the inner wall of the end face of the end of the cylindrical structural member (21) close to the pipeline form a pneumatic buffer area (26), and the pneumatic buffer area (26) communicates with the adjusting hole (213); The spring (221) is arranged in the pneumatic buffer area (26), and one end of the spring (221) abuts against the inner wall of the end face of the pipeline, and the other end abuts against the piston cylinder (222), and when the exhaust pressure changes, the pressure difference between the pneumatic buffer area (26) and the buffer area (25) changes, and the spring (221) is compressed and released to open / close the communication hole (212).

6. The exhaust pressure pulsation adjusting device for a vacuum pump set according to claim 5, wherein: The piston cylinder (222) includes an abutting end face (2221), a first cylinder wall (2222) and a second cylinder wall (2223) extending on both sides of the abutting end face (2221) respectively; The first cylinder wall (2222) is used to close the communication hole (212), and the second cylinder wall (2223) and the abutting end face (2221) form an abutting space for accommodating the spring (221).

7. The exhaust pressure pulsation adjusting device for a vacuum pump set according to claim 6, characterized by: The adjusting mechanism (2) further comprises a gas regulator capable of adjusting the buffer force of the pneumatic buffer area (26) according to the exhaust pressure of the exhaust port and communicating with the pneumatic buffer area (26); When the exhaust pressure of the exhaust port is above the atmospheric pressure, the gas regulator charges air through the adjusting hole (213) towards the pneumatic buffer area (26) to increase the pressure of the pneumatic buffer area (26); When the exhaust pressure of the exhaust port is below the atmospheric pressure, the gas regulator evacuates through the adjusting hole (213) to reduce the pressure of the pneumatic buffer area (26).

8. The exhaust pressure pulsation adjusting device for a vacuum pump set according to claim 7, characterized by: The outer shell (1) and the cylindrical structural member (21) are connected through a fixed rib plate.

9. The exhaust pressure pulsation adjusting device for a vacuum pump set according to claim 1, wherein: The gas inlet end (211) and the exhaust end of the outer shell (1) are kf vacuum joints (3), and the outer shell (1) is detachably connected with the exhaust port of the vacuum main machine and the gas inlet port of the pipeline through the kf vacuum joints (3).

10. A vacuum package, characterized by: A plurality of vacuum devices, the exhaust pressure pulsation adjusting device for vacuum unit and the pipeline according to any one of claims 1-9 are included, and the exhaust pressure pulsation adjusting device for vacuum unit is arranged at the exhaust port of the vacuum device, and adjacent vacuum devices are connected in sequence through the exhaust pressure pulsation adjusting device and the pipeline.

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