A low noise combination air extractor

Abstract

The application relates to a low-noise combined air extractor, which comprises a primary steam jet air extractor, a secondary steam jet air extractor, a steam seal air extractor, a top cover, a steam inlet assembly, a vacuum valve, an upper cover plate and a shell, the primary steam jet air extractor, the secondary steam jet air extractor and the steam seal air extractor are respectively arranged above the upper cover plate; the steam inlet assembly is arranged above the upper cover plate and is connected with the working steam inlets of the primary steam jet air extractor, the secondary steam jet air extractor and the steam seal air extractor through three steam connecting pipes; the top cover is arranged above the upper cover plate and can realize vibration isolation and noise reduction of the steam jet air extractor; and the vacuum valve is arranged above the upper cover plate and is used for discharging non-condensed gas in the cooler of the secondary steam jet air extractor. The steam jet air extractor and the steam inlet assembly structure can reduce the generation of vibration noise from the source; the steam jet air extractor is isolated and cooled by cooling water, and the top cover and the filled damping material can increase the damping of vibration noise on the propagation path.

Description

Technical Field

[0001] The present invention relates to an air extractor for a marine steam seal system and a condenser, in particular to a combined air extractor for a steam seal system and a condenser. Background Art

[0002] Air leaking into the steam seal system and condenser needs to be extracted using an air extractor. The internal pressure of the condenser is low, so a two-stage steam jet air extractor is required. The internal pressure of the steam seal system is low, so a single-stage steam jet air extractor is required.

[0003] The combined vacuum pump currently used combines the two-stage condenser vacuum pump with the first-stage steam ejector vacuum pump into one vacuum pump. The cooler of the second-stage steam ejector vacuum pump is shared to reduce the overall size of the vacuum pump. Figure 1 As shown:

[0004] The steam seal vacuum pumps are all installed on the upper part of the combined vacuum pump, namely the first-stage steam jet vacuum pump, the second-stage steam jet vacuum pump and the steam seal vacuum pump. The three coolers from left to right are the first-stage steam extractor cooler, the second-stage steam extractor cooler and the steam seal vacuum pump cooler.

[0005] The non-condensable gas and part of the exhaust steam in the condenser are extracted by the first-stage steam ejector and enter the first-stage cooler. Part of the steam is condensed, and the remaining steam and non-condensable gas are extracted by the second-stage ejector into the second-stage cooler. The exhaust steam is condensed and the non-condensable gas is discharged through the drain valve.

[0006] The non-condensable gas and leaked steam in the steam seal system first enter the steam seal vacuum pump cooler, and then are driven by the steam seal steam ejector into the secondary cooler.

[0007] The cooler adopts a U-tube structure, and the cooling water enters and exits the cooler from the bottom of the cooler.

[0008] Combined vacuum pumps produce high noise and strong vibration during use, which has a significant negative impact on on-site users and the operating environment. The main source of vibration and noise occurs in the steam jet vacuum pump. Summary of the Invention

[0009] The present invention proposes a low-noise combined vacuum pump, which can improve the problem of high noise in traditional combined vacuum pumps and enable the combined vacuum pump to achieve low-noise operation.

[0010] In order to achieve the above object, the technical scheme of the present application is: a low-noise combined air extractor, comprising a first steam jet air extractor, a second steam jet air extractor, a steam seal air extractor, a top cover, a steam inlet assembly, a vacuum valve, an upper cover plate, a shell, a tube plate and a tube bundle, and a bottom water chamber plate, wherein the first steam jet air extractor, the second steam jet air extractor and the steam seal air extractor are respectively installed above the upper cover plate; the steam inlet assembly is placed above the upper cover plate and is connected to the working steam inlets of the first steam jet air extractor, the second steam jet air extractor and the steam seal air extractor through three steam connecting pipes; the top cover is installed above the upper cover plate to realize vibration isolation and noise reduction of the steam jet air extractor; and the vacuum valve is installed above the upper cover plate to discharge non-condensed gas in the cooler of the second steam jet air extractor.

[0011] Further, the bottom water chamber plate, the tube plate and the tube bundle and the shell are connected and installed below the upper cover plate by bolts.

[0012] Further, the condensate on the cooling water side enters the combined air extractor through the bottom water chamber plate, the cooling water is cooled by the tube plate and the tube bundle, and then is discharged into the chamber where the steam jet air extractor is located, and is discharged from the upper part of the chamber, so as to realize the cooling of the whole combined air extractor and the sound insulation of the injection pipe part of the steam jet air extractor.

[0013] Further, the air side, the steam and the non-condensed gas in the cooler enter the cooler after passing through the first steam jet air extractor and the second steam jet air extractor, wherein the exhaust steam is condensed into saturated water and is discharged, and the unsaturated gas is discharged through the vacuum valve.

[0014] Further, the top part of the shell, the bottom part of the shell, the shape of the nozzle and the inside of the injection pipe of the steam jet air extractor all adopt an inverted conical angle structure, and a triangular conical angle is additionally arranged at the rear of the nozzle, so as to make the flow channel inside the steam jet air extractor smooth.

[0015] Further, the top cover is arranged outside the steam jet air extractor, and a damping material is filled in the inside of the top cover to realize vibration reduction and noise reduction.

[0016] Further, an operation hole is formed in the top cover, which is used for adjusting the valve opening of the steam jet air extractor during the debugging stage.

[0017] The beneficial effects of the present application are:

[0018] 1. The structure of the steam jet air extractor and the steam inlet assembly can reduce the generation of vibration noise from the source.

[0019] 2. The steam jet air extractor is isolated and cooled by the cooling water, and the top cover and the damping material are filled, which can increase the damping of the vibration noise on the propagation path.

[0020] The use of this structure can effectively improve the problems of high noise and high vibration encountered by existing combined vacuum pumps, and has a wide range of application prospects in marine vacuum pumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of an existing combined vacuum pump;

[0022] Figure 2 This is a front view of the low-noise combined vacuum pump of the present invention;

[0023] Figure 3 yes Figure 2 Right view;

[0024] Figure 4 yes Figure 2 A top view of

[0025] Figure 5 This is an exploded view of the low-noise combined air extractor structure of the present invention;

[0026] Figure 6 It is the flow diagram of cooling water side;

[0027] Figure 7 This is a cross-sectional view of the internal structure of the steam ejector;

[0028] Figure 8 It is a three-dimensional schematic diagram of the structure of the steam ejector;

[0029] Figure 9 It is a three-dimensional schematic diagram of the steam inlet component structure;

[0030] Figure 10 It is a plan view of the steam inlet assembly structure;

[0031] Figure 11 It is a cross-sectional view of the steam inlet component structure. DETAILED DESCRIPTION

[0032] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0033] like Figures 1 to 11 As shown, a new type of low-noise vacuum pump of the present invention is mainly composed of a first-stage steam jet vacuum pump 1, a second-stage steam jet vacuum pump 2, a top cover 3, a steam inlet assembly 4, an exhaust valve 5, a steam seal vacuum pump 6, an upper cover plate 7, a shell 8, a tube sheet and tube bundle 9 and a bottom water chamber plate 10.

[0034] The first-stage jet steam evacuator 1, the second-stage jet steam evacuator 2, and the steam seal evacuator 6 are installed above the upper cover plate 7. The bottom water chamber plate 10, the tube sheet and tube bundle 9, and the shell 8 are installed below the upper cover plate 7 by bolt connection. The steam inlet assembly 4 is placed above the upper cover plate 7 and is connected to the working steam inlets of the first-stage jet steam evacuator 1, the second-stage jet steam evacuator 2, and the steam seal evacuator 6 through three steam pipes. The top cover 3 is installed above the upper cover plate 7 to achieve vibration isolation and noise reduction for the jet steam evacuator. The drain valve 5 is installed above the upper cover plate 7 to discharge the non-condensable gas in the cooler of the second-stage jet steam evacuator.

[0035] The air, steam, and non-condensable gases in the cooler pass through the jet ejector and enter the cooler. Exhaust steam is condensed into saturated water and discharged, while unsaturated gases exit the system through the drain valve. The steam and air paths through the jet ejector and cooler are identical to those in a traditional combined ejector structure and will not be further described.

[0036] Condensate from the cooling water side enters the modular vacuum pump through the bottom water chamber plate. After cooling through the tube sheet and tube bundle, the cooling water is discharged into the chamber where the jet vacuum pump is located and discharged from the top of the chamber. The introduction of cooling water into the jet vacuum pump chamber cools the modular vacuum pump as a whole and provides sound insulation for the ejector pipe portion of the jet vacuum pump.

[0037] Cooling water side flow diagram Figure 6 shown.

[0038] Among the above parts, the steam ejector, top cover and steam inlet assembly have also been greatly improved to achieve better vibration and noise reduction. Among them:

[0039] (a) Steam ejector, such as Figure 7 , as shown in 8.

[0040] The new steam jet ejector features an inverted cone structure at every location, including the shell top and bottom, the nozzle profile, and the interior of the ejector tube. A triangular cone is added behind the nozzle to smooth the flow path within the jet ejector.

[0041] (b) Top cover

[0042] The top cover is a newly added component. It is located outside the steam jet vacuum pump and mounted above the upper cover. Damping material is filled inside the cover to reduce vibration and noise. An access hole is located above the top cover, allowing the valve opening of the steam jet vacuum pump to be adjusted during commissioning.

[0043] (c) Steam inlet components, such as Figure 9 , 10, 11.

[0044] The original steam inlet assembly had many elbows in the pipeline, and high-speed steam flow in a small pipe diameter easily generated loud noise. The new steam inlet assembly structure minimizes the number of turns in the high-speed steam flow, controlling the generation of high-speed steam vibration and noise at the source.

[0045] During assembly, first secure the shell to the mounting base, install the tube bundle and tube sheet below the shell, the bottom water chamber plate below the shell, the upper cover above the shell, the steam ejector, steam inlet assembly, and drain valve above the upper cover. The top cover is installed at the top of the equipment.

Claims

1. A low-noise combined vacuum pump, characterized in that: It includes a first-stage steam jet vacuum pump, a second-stage steam jet vacuum pump, a steam seal vacuum pump, a top cover, a steam inlet assembly, an exhaust valve, an upper cover plate, a shell, a tube sheet and a tube bundle, and a bottom water chamber plate. The first-stage steam jet vacuum pump, the second-stage steam jet vacuum pump, and the steam seal vacuum pump are respectively installed above the upper cover plate; the steam inlet assembly is placed above the upper cover plate and is connected to the working steam inlet of the first-stage steam jet vacuum pump, the second-stage steam jet vacuum pump, and the steam seal vacuum pump through three steam pipes; the top cover is installed above the upper cover plate to achieve vibration isolation for the steam jet vacuum pump Noise reduction; the exhaust valve is installed above the upper cover plate to discharge the non-condensable gas in the cooler of the secondary steam jet vacuum pump; the shell top, shell bottom, nozzle shape and the inside of the ejector pipe in the steam jet vacuum pump all adopt an inverted cone structure, and a triangular cone is installed behind the nozzle to make the internal flow path of the steam jet vacuum pump smooth; the top cover is arranged on the outside of the steam jet vacuum pump; the inside of the top cover is filled with damping material to achieve vibration reduction and noise reduction; an operation hole is opened above the top cover for adjusting the valve opening of the steam jet vacuum pump through the operation hole during the debugging stage.

2. The low-noise combined vacuum pump according to claim 1, characterized in that: The bottom water chamber plate, tube plate, tube bundle and shell are installed under the upper cover plate through bolt connection.

3. The low-noise combined vacuum pump according to claim 1, characterized in that: The condensed water on the cooling water side enters the combined vacuum pump through the bottom water chamber plate. The cooling water is cooled by the tube plate and tube bundle and then discharged into the chamber where the jet steam vacuum pump is located, and is discharged from the upper part of the chamber to achieve overall cooling of the combined vacuum pump and to achieve sound insulation for the ejector pipe part of the jet steam vacuum pump.

4. The low-noise combined vacuum pump according to claim 1, characterized in that: The air side, steam and non-condensable gas in the cooler enter the cooler after passing through the first-stage steam ejector and the second-stage steam ejector. Among them, the exhaust steam is condensed into saturated water and discharged, and the unsaturated gas is discharged through the drain valve.

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