Jet vacuum pump

Abstract

A jet vacuum pump is described that is configured to house two or more jet units, each of which is individually accessible and replaceable from the outside of the jet vacuum pump. The jet units can be replaced with jet unit replacement inserts, allowing for convenient adjustment of the suction power and performance of the jet vacuum pump. Adjustment of the characteristics of the jet vacuum pump is also described, which can be easily achieved by, for example, replacing one jet unit with another jet unit having different characteristics, such as different nozzle characteristics.

Description

Technical Field

[0001] This disclosure relates to vacuum generators, and more specifically to a jet vacuum pump having one or more jet units, each of which is individually accessible and replaceable from outside the jet vacuum pump. The jet units of the vacuum pump of this disclosure can be replaced with jet unit replacement inserts or other jet units with different characteristics (e.g., different nozzle characteristics), thereby allowing convenient adjustment of the characteristics and / or performance (e.g., pumping power) of the vacuum pump of this disclosure. This disclosure also relates to methods for adjusting the pump characteristics and / or performance of the jet vacuum pump of this disclosure. Background Technology

[0002] Vacuum generators are known in the art. The vacuum generator described herein is supplied with a pressurized airflow that generates a reduced pressure within the vacuum generator. Such a vacuum generator includes one or more jet units. A jet unit may also be referred to as a Venturi unit. The one or more jet units are typically multi-stage. A vacuum can be generated in each stage. A vacuum generator comprising one or more multi-stage jet units may be referred to as a multi-stage jet vacuum pump.

[0003] Multistage jet vacuum pumps, wherein an ejector having two or more nozzles is housed in a pump housing, are known, for example, from WO 99 / 49216 A1. According to WO 99 / 49216 A1, the pump housing can be configured to house two or more ejectors that operate in parallel as disclosed therein.

[0004] In the case of a multistage jet vacuum pump with two or more (usually two, three or four) jet units, the jet units can be connected in parallel so that for each stage, there is a suction chamber shared by the jet units.

[0005] WO 2022 / 269363 A1 discloses a level 2, and in Figure 7 Figure 2A three-stage jet vacuum pump with four Venturi units is disclosed. The four Venturi units are arranged in a cluster 40, which can be inserted as a single unit into a vacuum generator 1. This reduces the number of required seals. According to WO 2022 / 269363A1, when the Venturi units have a cylindrical shape that allows easy insertion into the vacuum pump body, a large number of seals increases the risk of leakage. Furthermore, according to WO 2022 / 269363A1, the use of individual Venturi units, as in EP 2827004 and EP 1064464, would require the assembly and disassembly of each unit inserted into the pump body, increasing the pump's manufacturing and maintenance time. The cluster 40 is inserted into the housing 10 and secured therein by the rear 10d of the housing. The flow rate pumped and consumed by the vacuum generator disclosed in WO 2022 / 269363A1 can be reduced by adjusting the number of Venturi units. For this purpose, once the cluster has been removed from the housing, any of the four tertiary venturi units can be deactivated by inserting the four plugs 50, 51, 52, and 53 into the desired venturi unit. This adjustment also requires removing the cluster so that it can be accessed to plug the desired venturi unit within it.

[0006] KR 2016 0027515 A discloses a vacuum jet pump having multiple multistage ejectors mounted in a single housing. The disclosed vacuum jet pump includes multiple vacuum chambers; one vacuum chamber for each multistage ejector. The vacuum chambers are arranged in communication with each other. A valve is provided on each stage of each multistage ejector.

[0007] US 2019 / 0054635 A1 discloses a vacuum clamp unit including a vacuum pump. The pump has a common vacuum chamber and first and second mounting cylinders. The vacuum pump is inserted and mounted in the first cylinder, and the second mounting cylinder is selectively inserted and mounted with either the vacuum pump or a release valve.

[0008] The goal is to be able to easily adjust the suction power of the vacuum generator. Summary of the Invention

[0009] According to this disclosure, for a multistage vacuum generator having multiple venturi units (e.g., disclosed in WO 2022 / 269363A1), the above objective is achieved by making each of the venturi units individually accessible and replaceable from outside the multistage vacuum pump.

[0010] According to this disclosure, for a jet vacuum pump having multiple multistage ejectors (e.g., disclosed in KR 2016 0027515 A), the above objective is achieved by providing a number of vacuum chambers in the jet vacuum pump equal to the number of stages of the multistage ejectors, wherein each vacuum chamber corresponds to only one stage of the multistage ejector, and the vacuum chamber is configured to accommodate the corresponding vacuum generating stage of each of the multiple multistage ejectors when inserted into the jet vacuum pump.

[0011] In its most general embodiment, the jet vacuum pump of this disclosure includes a pump body configured to accommodate two jet units therein. This disclosure provides the option of replacing the jet units in the pump body with jet unit replacement inserts corresponding to airtight, blocked jet units. Therefore, in its most general embodiment, the jet vacuum pump of this disclosure includes a first jet unit inserted into the pump body, and a second jet unit or a jet unit replacement insert inserted into the pump body.

[0012] Therefore, in one aspect, this disclosure relates to a jet vacuum pump 1 configured to accommodate two or more jet units therein, the jet vacuum pump comprising: a pump body 10; a housing 20 configured to accommodate the pump body 10 therein; a first jet unit 30 having one or more vacuum generation stages; two or more jet unit seats 85 formed in the pump body 10, each of the two or more jet unit seats 85 configured to accommodate a jet unit 30 therein, the total number of jet unit seats 85 corresponding to the total number of jet units 30 that the pump is configured to accommodate; an inlet 40 disposed in the housing 20 and configured to receive pressurized air; a suction opening 50 disposed in the housing 20; and a seal 70 configured to hermetically seal the first jet unit 30 to the pump body 10, the first jet unit 30 being removable from the pump body 10 and configured to operate within the housing 20. The pump body 10 is fixed in position in one of two or more injection unit seats 85 formed in the pump body 10, wherein the housing 20 has a separate opening 80 in its rear wall 25 for each of the two or more injection unit seats 85, the separate opening 80 being configured to allow the injection unit 30 to be inserted into and removed from the unit seat 85 through the separate opening 80, wherein the pump body 10 has one or more vacuum chambers 471, 472, 473, each of the one or more vacuum chambers 471, 472, 473 being in fluid communication with the suction opening 50, and the pump body 10 additionally selectively includes a second injection unit 30 in a second injection unit seat 85 formed in the two or more injection unit seats 85 of the pump body 10, the second injection unit having the same number of vacuum generation stages as the first injection unit 30;Alternatively, a first jet unit replacement insert 35 may be installed in one of the two or more jet unit seats 85, in the second jet unit seat 85, wherein each vacuum chamber 471, 472, 473 is configured to accommodate a selected vacuum generation stage of the first jet unit 30 and, in the presence, a selected vacuum generation stage of the second jet unit 30, wherein the seal 70 is further configured to hermetically seal the second jet unit 30 to the pump body 10 in the presence, and to hermetically seal the first jet unit replacement insert 35 to the pump body 10 in the presence, wherein the second jet unit 30 is removable from the pump body 10 in the presence and is configured to be fixed in an operating position within the housing 20 in one of the two or more jet unit seats 85 formed in the pump body 10, and wherein the first jet unit replacement insert 35 is removable from the pump body 10 in the presence and is configured to be fixed within the housing 20 in a hermetically blocked position of the second jet unit seat in one of the two or more jet unit seats 85 formed in the pump body 10. ;

[0013] Therefore, the above aspects can be divided into embodiments of the jet vacuum pump 1 of this disclosure having two or more jet units 30 and no jet unit replacement plug 35, and embodiments having at least one jet unit 30 and one or more jet unit replacement plugs 35, in the latter case, provided that the pump 1 of this disclosure includes at least one jet unit 30.

[0014] The first and second jet units 30 or the first jet unit 30 and the first jet unit replacement plug 35 of the jet vacuum pump 1 of this disclosure are independently and separately removable from the pump body 10 of the jet vacuum pump 1 of this disclosure. Any other one or more other jet units 30 and / or any other one or more other jet unit replacement plugs 35 housed in the pump body 10 of the jet vacuum pump 1 of this disclosure are also independently and separately removable from the pump body 10.

[0015] In the jet vacuum pump 1 of this disclosure, in each jet unit seat 85 other than the first and second jet unit seats 85 formed in the two or more jet unit seats 85 in the pump body 10, either a removable jet unit 30 is fitted or a removable jet unit replacement insert 35 is fitted.

[0016] In the jet vacuum pump 1 disclosed herein, a seal 70 is provided to hermetically seal any one or more other jet units 30 and any one or more other replacement inserts 35.

[0017] This disclosure allows easy access to the jet unit 30 from the outside of the vacuum pump 1 without turning on the vacuum pump. The individual jet unit 30 of this disclosure can be removed from its position within the vacuum pump for maintenance or replacement. Thus, exposure to the pump's interior and any other jet units 30 present in the pump is minimized, thereby reducing the risk of contamination or fouling.

[0018] According to this disclosure, the jet unit 30 of the jet vacuum pump 1 can be replaced by a jet unit replacement insert 35, which is configured to correspond to a completely hermetically sealed jet unit 30 and is inserted into a corresponding individual opening 80. For the pump to function as intended, the pump must include at least one jet unit 30, and furthermore, each of two or more jet unit seats 85 in the pump must be occupied, either by a removable jet unit 30 or by a removable jet unit replacement insert 35.

[0019] Therefore, in another aspect, this disclosure relates to a method for adjusting the pump performance of a jet vacuum pump 1 configured to accommodate two or more jet units 30, comprising the steps of: inserting jet unit replacement inserts 35, which do not have jetting capabilities, into the jet vacuum pump 1 from the outside. By replacing individual jet units 30 with individual jet unit replacement inserts 35, the maximum achievable pumping power of the vacuum pump 1 will be reduced. This disclosure thus allows the pumping power performance of a vacuum pump to be adjusted by regulating the number of jet units in the vacuum pump. The more jet units 30 the vacuum pump is configured to accommodate, the greater the degree of regulation obtained by replacing one or more individual jet units with a corresponding number of individual jet unit replacement inserts 35.

[0020] The seal 70 is preferably embedded in the separate injection unit replacement insert 35 of this disclosure, such that when the separate injection unit replacement insert is removed from the pump body, the associated seal is also removed from the pump body along with the injection unit replacement insert. This allows for easy inspection, cleaning, and replacement of the seal when needed (e.g., due to wear).

[0021] The annular seal 70 is preferably embedded in the individual injection unit 30 of this disclosure, such that when the individual separate injection unit is removed from the pump body, the associated seal is also removed from the pump body along with the injection unit. This allows for easy inspection, cleaning, and replacement of the seal when needed (e.g., due to wear).

[0022] According to this disclosure, the injection unit 30 does not need to include a valve (e.g., a check valve). Preferably, one or more injection units 30 used according to this disclosure do not include valves. By omitting valves, the injection unit 30 can be manufactured to be smaller and less sensitive to contamination, and when the valveless injection unit 30 is inserted into the pump, there is no need to inspect, and possibly requires cleaning, the valve. Conversely, check valves can be provided for one or more vacuum chambers.

[0023] Preferably, the seal 70 is annular. The annular shape is considered to contribute to an effective seal for both the injection unit 30 and the injection unit replacement insert 35 compared to other geometries.

[0024] The individual injection unit replacement insert 35 of this disclosure is configured to correspond to a completely airtight blockage of the individual injection unit 30, which is inserted into one or more individual openings 80. A seal 70 is configured to airtightly seal the injection unit replacement insert 35 to the pump body 10 within the injection unit seat 85.

[0025] Compared to the vacuum generator of WO 2022 / 269363 A1, the individual jet unit 30 of the vacuum pump 1 of this disclosure can be removed without turning on the vacuum pump, without exposing the pump's interior and / or other jet units (thus risking contamination of exposed components), and also unlike the vacuum generator of WO 2022 / 269363 A1, blockage of the individual jet unit 30 only requires replacing the individual jet unit 30 from the outside of the pump with an individual jet unit replacement insert 35. The removed jet unit 30 itself does not need to be blocked or modified in any way, but can be safely stored until needed again, ready for direct use.

[0026] The enhanced adjustability and ease of adjustment of the pump performance disclosed herein are believed to help reduce energy consumption and costs.

[0027] This disclosure allows the individual jet units of the pump to be quickly and easily replaced, inserted, or removed. Thus, the jet vacuum pump of this disclosure allows for rapid adjustment or tuning of its performance to suit desired performance.

[0028] The ease of removing and inserting the injection unit and injection unit replacement plug can be further enhanced by using quick-release connectors (such as bayonet connectors).

[0029] Furthermore, different jet units can exhibit different characteristics in terms of feed pressure, airflow, and achievable vacuum. Therefore, the performance and / or characteristics of the jet vacuum pump disclosed herein can be adjusted by replacing a jet unit with a certain characteristic with another jet unit having different characteristics.

[0030] Therefore, the jet vacuum pump of this disclosure allows for adjustment from being suitable for high-pressure feed to being suitable for low-pressure feed, from being suitable for high flow rate to being suitable for low flow rate, and from being suitable for generating high vacuum to being suitable for generating lower vacuum.

[0031] Therefore, in another aspect, this disclosure relates to a method for adjusting the pump characteristics or performance of a jet vacuum pump 1 configured to accommodate two or more jet units 30, comprising the steps of: inserting a second jet unit 30 exhibiting a second jet characteristic from outside the jet vacuum pump 1 into the jet vacuum pump 1, the second jet characteristic being different from the first jet characteristic exhibited by the first jet unit 30 of the jet vacuum pump 1.

[0032] Other embodiments and advantages of this disclosure will become apparent from the following detailed description and the appended claims. As used herein, the term "jet unit" is used to refer to a single ejector, i.e., a separate ejector having one or more vacuum generation stages. The jet unit is configured to be removed and inserted from the jet vacuum pump 1 of this disclosure separately and independently of any other jet units present in the pump of this disclosure.

[0033] The term "injection unit replacement insert" is used herein to refer to a structure having a geometry similar to that of an injection unit, used to block the injection unit seat by inserting the injection unit replacement insert into the injection unit seat. Therefore, when inserted into the injection unit seat 85, the injection unit replacement insert prevents air from passing through the injection unit seat in the pump. Thus, the injection unit replacement insert of this disclosure has no injection characteristics. Attached Figure Description

[0034] Figure 1 An exploded perspective view of a multi-stage embodiment of the jet vacuum pump 1 of this disclosure is shown. The multi-stage embodiment includes three stages and has three jet units 30, one of which has been removed, leaving an open opening 80 in the vacuum pump housing 20.

[0035] Figure 2 It shows along Figure 1 The cross-sectional view of plane AA shown shows the three stages of vacuum pump 1 and the jet unit seat 85, which includes four unit seat sections 85a, 85b, 85c and 85d, in which the removed jet unit will be housed.

[0036] Figure 3 It shows Figure 1 Side view of the removed injection unit 30.

[0037] Figure 4 It shows Figure 3A more detailed cross-sectional view of the injection unit 30 along line BB, in which the three stages of the injection unit 30 can be seen.

[0038] Figure 5 It shows the configuration for replacement Figures 1 to 4 A side view of an embodiment of the injection unit replacement plug 35 of the removed injection unit 30 shown.

[0039] Figure 6 It shows Figure 5 The section view of the injection unit replacement plug-in 35 along line CC. Detailed Implementation

[0040] The vacuum pump 1 of this disclosure is configured to accommodate two or more jet units 30. Thus, in embodiments having only two jet unit seats 85, each of the two seats may be fitted with a separate jet unit 30, one of which can be replaced by a jet unit replacement insert 35, such that the vacuum pump of this disclosure will also include at least one jet unit 30 even if one jet unit has been replaced by a jet unit replacement insert 35. Typically, the vacuum pump 1 of this disclosure is configured to accommodate three or more jet units, such as 3, 4, 5, or 6 jet units, and therefore has a corresponding number of jet unit seats 85 and openings 80. The jet units are arranged in parallel and may, for example, be stacked in layers (e.g., divided into 2, 3, or 4 layers each having, for example, 2 to 4 jet units), or arranged to form a cylinder.

[0041] The multi-stage jet vacuum pump 1 of this disclosure typically has 2, 3, or 4 stages. The jet unit 30 in the jet vacuum pump 1 of this disclosure has the same number of stages as the pump 1. In the case of 2, 3, or 4 stages, to improve the maintained vacuum level after the pressurized air flow is interrupted, a check valve 60 (not shown) common to all stages of the multi-stage vacuum pump of this disclosure can be provided connected to the suction port 50. For enhanced vacuum and energy saving purposes, it is preferable to provide a separate check valve 60 for each stage, for example, as shown below. Figure 1 and Figure 2 As shown. When present, the check valve of a certain stage is preferably common to all injectors in that stage, for example, as Figure 1 and Figure 2 As shown. When present, check valve 60 (not shown) can be common to two or more stages of the multi-stage vacuum pump 1 of this disclosure. However, preferably, as indicated above, and as... Figure 1 and Figure 2 As shown, a separate check valve 60 is provided for each stage. When the jet vacuum pump 1 of this disclosure includes two or more stages, a common vacuum chamber 47 is provided, as shown... Figure 1 and Figure 2As shown, each stage opens into this chamber. The common vacuum chamber 47 is configured to fluidly connect all stages of the multistage vacuum pump embodiment 1 of this disclosure to the suction opening 50.

[0042] The check valve 60 can be simply embodied as, for example, a flap valve, such as Figure 1 As shown. The flap valve 60 can be suitably made of a flexible material (e.g., an elastomer). When a separate check valve 60 is provided for each stage, the check valve can be attached to a valve opening plate 65 having an opening 67 configured to fluidly connect each stage of the multi-stage jet vacuum pump 1 of this disclosure to a common vacuum chamber 47, as shown. Figure 1 and Figure 2 As shown.

[0043] An exhaust chamber 45 is formed in the pump of this disclosure, and exhaust air is discharged from the exhaust chamber through an exhaust opening 55. The exhaust chamber 45 is configured to receive exhaust air discharged from the last stage of the injection pump from the injection unit 30. Each injection unit 30 is provided with one or more exhaust openings 77 that open into the exhaust chamber 45.

[0044] The jet unit replacement insert 35 has a similar geometry to the jet unit 30. Since the function of the jet unit replacement insert 35 is to block the jet unit location in the vacuum pump body 10, it can be manufactured simply and lightweight using a suitable plastic material. A similar seal 70 is used for both the jet unit replacement insert 35 and the jet unit 30. In a preferred embodiment, the jet unit replacement insert 35 of this disclosure is integrally formed as a single piece, except for the seal 70, as shown below. Figure 4 As shown.

[0045] The injection unit 30 and the injection unit replacement insert 35 each preferably include a locking portion 90, configured to be releasably secured from the outside to the housing 20 in a separate opening 80. The locking portion 90 is preferably attached to the injection unit 30 and the injection unit replacement insert 35 to allow the injection unit 30 and the injection unit replacement insert 35 to be pulled out of the vacuum pump by pulling the locking portion 90. The type of locking of the locking portion 90 to the housing 20 is not critical; it can be a rotational locking engagement (e.g., as shown in the image). Figures 1 to 6 (as shown), or a quick-release connector (e.g., bayonet type, not shown).

[0046] The injection unit 30 and the injection unit replacement plug 35 should preferably have similar locking portions 90, which are secured to the housing 20 using similar locking devices. Thus, the injection unit 30 can be unlocked and removed from the opening 80 in the housing 20, and the injection unit replacement plug 35 can be inserted into the same opening 80 and locked to the housing 20 to replace the injection unit 30, and vice versa.

[0047] The locking portion 90 can be formed as a separate component, namely the locking member 90 (not shown). The attachment of the separate locking member 90 to the injection unit 30 or the injection unit replacement insert 35 can be suitably a snap-fit ​​engagement (not shown).

[0048] In one embodiment, the locking member 90 is rotatably attached to the injection unit 30 (not shown) and the injection unit replacement plug 35 (not shown) such that when the locking member 90 is a rotary locking member, the locking member can be rotated without rotating the injection unit or the injection unit replacement plug.

[0049] When the locking part 90 has been unlocked from the opening 80, the injection unit or injection unit replacement plug can be pulled out of the vacuum pump by pulling the locking part attached to the injection unit 30 or the injection unit replacement plug 35.

[0050] To improve the structural integrity and manufacturing convenience of the injection unit replacement plug-in 35 of this disclosure, it is preferable that the locking portion 90 is integrally formed with the injection unit replacement plug-in 35, such as... Figure 5 and Figure 6 As shown. To enhance manufacturing convenience and simplify the markings of the injection unit 30 (e.g., color markings corresponding to the performance of the injection unit), for the injection unit 30, the locking portion 90 is currently preferably formed as a separate locking member 90, preferably configured to snap-fit ​​onto the injection unit 30. To improve the robustness of the injection unit 30 of this disclosure having the separate locking member 90 attached thereto, the locking member is preferably prevented from rotating in its attached position to the injection unit 30, for example by one or more circumferential protrusions (not shown) formed at the rear of the injection unit 30 and one or more corresponding openings or recesses (not shown) formed in the locking member 90, the circumferential protrusions engaging with the openings or recesses.

[0051] Each injection unit includes a first nozzle 75 at its front end, configured to receive pressurized air from inlet 40. A given first nozzle 75 can be configured to provide a certain maximum performance. Therefore, different first nozzles can be used to provide different maximum performance to different injection units. Thus, according to this disclosure, the suction power can be easily adjusted by replacing one injection unit with another injection unit having different nozzle characteristics. In a preferred embodiment, the first nozzle 75 of the injection unit 30 is configured to be replaceably attached to the injection unit, for example, by snap-fit ​​engagement.

[0052] Although nozzles are provided for each stage of the injection pump of this disclosure, and all these nozzles can be configured differently in different injection units, it is currently considered more efficient and therefore more preferred to provide variability in nozzle characteristics solely by varying the first nozzle 75. Therefore, in a preferred embodiment, the first nozzle is configured to be attached to the injection unit 30. In such embodiments (e.g.) Figure 3 As shown), the number of seals 70 on the injection unit is equal to the stage number + 1, that is, one of each of the four parts 85a, 85b, 85c and 85d forming the unit seat 85. Therefore, Figure 3 and Figure 4 The injection unit 30 shown has three nozzles (configured for use in a three-stage injection pump) and therefore has four seals 70. Similarly, as Figure 5 and Figure 6 The injection unit replacement insert 35 shown is configured for use in a three-stage injection pump and therefore also has four seals 70.

[0053] For each nozzle of the injection unit 30, one or more inlet openings 76 are provided on the injection unit behind the nozzle for each stage of the injection unit.

[0054] The performance of a given injection unit is preferably configured to be externally identifiable, for example, by a color code or marking provided on the outer surface 100 of the locking portion 90, for which the locking portion preferably takes the form of a separate locking member 90. Similarly, the injection unit replacement insert 35 is also preferably configured to be externally identifiable.

[0055] The unit seat 85 preferably has a stop device configured to prevent the injection unit or injection unit replacement insert from being further inserted into the pump body beyond the stop device. In a preferred embodiment, the front end portion 85a of each unit seat 85 has a reduced diameter (not shown) configured to prevent the first nozzle 75 of the injection unit 30 from being further introduced into the pump body. As will be understood from this disclosure, the stop device must be configured to allow pressurized air to enter the first nozzle.

[0056] In a preferred embodiment, a tool connection portion is provided in the outer surface 100 of the locking portion 90. To simplify locking, unlocking, and replacing the injection unit or injection unit replacement insert, the tool connection portion can be, for example, a recess in the surface 100 configured for connection with a tool, such as a slot 110 configured for connection with, for example, a coin or screwdriver. Figure 1 , Figure 2 , Figure 4 and Figure 6 As shown.

[0057] To achieve the desired fast response time of the jet pump 1 disclosed herein, the internal volume of the pump should be kept small.

[0058] Although the pressurized air inlet 40, exhaust opening 55 and suction opening 50 are already... Figure 1 and Figure 2 The exhaust opening 55 is shown on the same side of the housing 20, but it will be clear from this disclosure that the exhaust opening 55 may alternatively be located on the other side of the housing 20, which is different from the pressurized air inlet 40 and the suction opening 50, and the pressurized air inlet 40 may alternatively be located on the other side of the housing 20, which is different from the exhaust opening 55 and the suction opening 50.

[0059] List of reference numerals

[0060] 1. Jet vacuum pump

[0061] 10 Pump body

[0062] 20 Vacuum pump housing

[0063] 25 Rear wall of housing 20

[0064] 26 Outer surface of rear wall 25

[0065] 30 removable injection units

[0066] 35 Injection Unit Replacement Plugin

[0067] 40. Pressurized air inlet

[0068] 45 Exhaust Chamber

[0069] 47 Public Vacuum Chamber

[0070] 471 First-stage vacuum chamber

[0071] 472 Second-stage vacuum chamber

[0072] 473 Third-stage vacuum chamber

[0073] 50 suction opening

[0074] 55 Exhaust opening

[0075] 60 Check Valve

[0076] 65 Valve opening plate

[0077] 67 Valve opening

[0078] 70 Seals

[0079] The first nozzle of the 75 injection unit

[0080] 76 Injection unit inlet opening

[0081] 77 Injection unit exhaust opening

[0082] 80 Injection unit opening

[0083] 85 Injection Unit Mount

[0084] 90 Locked section

[0085] 100 Locking part 90 outer surface

[0086] 110 Tool connecting part in the outer surface of the locking part

[0087] AA Cross section through the vacuum pump and the removed jet unit

[0088] BB through the cross section of the injection unit

[0089] CC replaces the insert's cross-section with an injection unit.

Claims

1. A jet vacuum pump (1) configured to accommodate two or more jet units therein, the jet vacuum pump comprising: Pump body (10); A housing (20) is configured to house the pump body (10) therein; The first injection unit (30) has one or more vacuum generation stages; Two or more injection unit seats (85) are formed in the pump body (10), each of the two or more injection unit seats (85) being configured to accommodate an injection unit (30) therein, the total number of the injection unit seats (85) corresponding to the total number of the injection units (30) that the pump is configured to accommodate; An inlet (40), disposed in the housing (20), is configured to receive pressurized air; A suction opening (50) is provided in the housing (20); A seal (70) is configured to hermetically seal the first injection unit (30) to the pump body (10), the first injection unit (30) being removable from the pump body (10) and configured to be fixed in an operating position within the housing (20) in a first injection unit seat (85) among the two or more injection unit seats (85) formed in the pump body (10). The housing (20) has a separate opening (80) in its rear wall (25) for each of the two or more injection unit seats (85), the separate opening (80) being configured to allow an injection unit (30) to be inserted into and removed from the unit seat (85) through the separate opening (80). Its features are: The pump body (10) has one or more vacuum chambers (471, 472, 473), each of which is in fluid communication with the suction opening (50). The pump body (10) may also optionally include: a second injection unit (30) having the same number of vacuum generation stages as the first injection unit (30) in a second injection unit seat (85) among the two or more injection unit seats (85) formed in the pump body (10), or a first injection unit replacement insert (35) in a second injection unit seat (85) among the two or more injection unit seats (85) formed in the pump body (10). Each vacuum chamber (471, 472, 473) is configured to house a selected vacuum generation stage of the first injection unit (30) and, in the presence, a selected vacuum generation stage of the second injection unit (30). The seal (70) is further configured to hermetically seal the second injection unit (30) to the pump body (10) when present, and to hermetically seal the first injection unit replacement insert (35) to the pump body (10) when present. The second injection unit (30), when present, is removable from the pump body (10) and configured to be fixed in an operating position within the housing (20) in the second injection unit seat (85) among the two or more injection unit seats (85) formed in the pump body (10), and The first injection unit replacement insert (35) is removable from the pump body (10) when present and is configured to be fixed within the housing (20) in the housing (10) to airtightly block the position of the second injection unit seat in one of the two or more injection unit seats (85) formed in the pump body (10).

2. The jet vacuum pump (1) according to claim 1, wherein each of the first jet unit (30), the second jet unit (30) in the presence, and the first jet unit replacement insert (35) in the presence includes a locking portion (90) configured to be releasably secured from the outside to the housing (20) in the separate opening (80).

3. The jet vacuum pump (1) according to claim 2, wherein the locking portion (90) is formed as a separation member axially attached to each of the first jet unit (30), the second jet unit (30) in the presence, and the first jet unit replacement insert (35) in the presence.

4. The jet vacuum pump (1) according to claim 2 or 3, wherein a tool connection portion (110) is formed in the outer surface (100) of the locking portion (90).

5. The jet vacuum pump (1) according to any one of the preceding claims, wherein the nominal maximum performance of the jet unit (30) can be identified externally, for example by the outer surface (100) of the locking portion (90) having a certain color, or by providing a mark on the outer surface (100) of the locking portion (90) corresponding to a certain nominal maximum performance of the jet unit (30).

6. The jet vacuum pump (1) according to any one of the preceding claims, wherein the seal (70) is annular and embedded in each of the first jet unit (30), the second jet unit (30) in the presence, and the first jet unit replacement insert (35) in the presence.

7. The jet vacuum pump (1) according to any one of claims 1 to 6, comprising a first jet unit replacement insert (35).

8. The jet vacuum pump (1) according to claim 7, wherein the first jet unit replacement insert (35) is configured to be externally identifiable, for example by having a certain color or by providing a mark on the outer surface (100) of the locking portion (90).

9. The jet vacuum pump (1) according to any one of the preceding claims, wherein the jet vacuum pump (1) is a multi-stage jet vacuum pump, preferably comprising 2, 3 or 4 stages, wherein the respective vacuum chamber (471, 472, 473) of each stage is fluidly connected to the suction opening (50) via a common vacuum chamber (47).

10. The multistage jet vacuum pump (1) according to claim 9, comprising a common check valve (60) for one or more stages, the check valve (60) being configured to prevent airflow from the common vacuum chamber (47) into the suction opening (50).

11. The multistage jet vacuum pump (1) according to claim 9, comprising a separate corresponding common check valve (60) for each stage, the check valve (60) being configured to prevent airflow from the first stage through a valve opening (67) into the common vacuum chamber (47).

12. A method for adjusting the pump characteristics and / or performance of a jet vacuum pump (1), said jet vacuum pump (1) being configured to accommodate two or more jet units (30), comprising the steps of: A second jet unit (30) exhibiting a second jet characteristic is inserted into the jet vacuum pump (1) from the outside of the jet vacuum pump (1). The second jet characteristic is different from the first jet characteristic exhibited by the first jet unit (30) of the jet vacuum pump (1).

13. The method of claim 12, further comprising the following steps: Locking part (90) of the inserted second injection unit (30) into opening (80) of pump (1), wherein the locking step is preferably performed without the use of tools, for example with a coin.

14. A method for adjusting the pump performance of a jet vacuum pump (1), said jet vacuum pump (1) being configured to accommodate two or more jet units (30), comprising the steps of: A jet unit replacement (35) without jetting performance is inserted into the jet vacuum pump (1) from the outside.

15. The method of claim 14, further comprising the following steps: Locking part (90) of the inserted injection unit replacement (35) into opening (80) of pump (1), wherein the locking step is preferably performed without the use of tools, for example with a coin.

Images