A combined air extractor with vacuum noise reduction

Abstract

The application relates to a combined air extractor with vacuum noise reduction, two steam inlet assemblies are arranged above the upper cover plate of a shell, a vacuum valve is arranged above the shell, and a top cover is arranged above the shell; a first steam jet air extractor, a second steam jet air extractor and a steam seal air extractor are arranged above the shell, the outlets of the first steam jet air extractor, the second steam jet air extractor and the steam seal air extractor are connected with the shell through connecting pipes, and baffles are arranged outside the connecting pipes, so that four sealed chambers are formed in the area between the connecting pipe of the first steam jet air extractor and the shell, the area between the connecting pipe of the second steam jet air extractor and the shell, the area between the connecting pipe of the steam seal air extractor and the shell and the area between the top cover and the shell, so as to block the noise transmission path. The structure of the application can fully utilize the characteristics of the air extractor body, and a vacuum area is formed to block the noise transmission path.

Description

TECHNICAL FIELD

[0001] The present application relates to a combined steam ejector for steam seal system and condenser extraction, especially a combined steam ejector with vacuum noise reduction. BACKGROUND

[0002] The air leaked into the steam seal system and condenser needs to be extracted by the steam ejector. The internal pressure of the condenser is relatively small, so a two-stage steam ejector is needed. The internal pressure of the steam seal system is relatively high, so a one-stage steam ejector is needed.

[0003] The combined steam ejector currently used combines the two-stage condenser steam ejector and the one-stage steam ejector into one steam ejector. The two-stage steam ejector shares the condenser, so as to reduce the overall size of the steam ejector. The structure is shown in Figure 1 The steam seal steam ejector is installed at the upper part of the combined steam ejector, which is a one-stage steam ejector, a two-stage steam ejector and a steam seal steam ejector. The three condensers from left to right are a one-stage steam ejector condenser, a two-stage steam ejector condenser and a steam seal steam ejector condenser.

[0004] The non-condensable gas in the condenser and a part of the exhaust steam are extracted by the one-stage steam ejector and then enter the one-stage condenser. Part of the steam is condensed, and the remaining steam and non-condensable gas are extracted by the two-stage steam ejector and enter the two-stage condenser. The exhaust steam is condensed, and the non-condensable gas is discharged through the exhaust valve. The non-condensable gas and the leaked steam in the steam seal system first enter the steam seal steam ejector condenser, and then are driven by the steam seal steam ejector to enter the two-stage condenser. The condenser adopts a U-shaped tube structure, and the cooling water enters and exits the condenser from the bottom of the condenser.

[0005] The combined steam ejector generates a lot of noise during use due to the high-speed steam flow through the steam ejector and the steam inlet assembly, which has a negative impact on the on-site users and the use environment. SUMMARY

[0006] The present application is to provide a combined steam ejector with vacuum noise reduction, which can realize low-noise operation of the combined steam ejector, so that the problem of high noise of the traditional combined steam ejector can be improved.

[0007] In order to achieve the above-mentioned purpose, the technical scheme of the present application is: a combined air extractor with vacuum noise reduction, comprising a first steam air extractor, a second steam air extractor, a steam seal air extractor, a top cover, a connecting pipe, a baffle, a steam inlet assembly, a vacuum valve, a shell, a tube bundle and a bottom water chamber, two steam inlet assemblies are placed above the upper cover plate of the shell, the vacuum valve is installed above the shell, and the top cover is installed above the shell; the first steam air extractor, the second steam air extractor and the steam seal air extractor are installed above the shell, the outlets of the first steam air extractor, the second steam air extractor and the steam seal air extractor are connected with the shell through the connecting pipes, baffles are installed on the outer sides to form four sealed chambers in the areas between the connecting pipes of the first steam air extractor and the shell, the areas between the connecting pipes of the second steam air extractor and the shell, the areas between the connecting pipes of the steam seal air extractor and the shell and the area between the top cover and the shell, so as to block the noise transmission path.

[0008] Further, the tube bundle and the bottom water chamber are fixedly installed below the shell by a tube plate and a bottom water chamber plate through bolts.

[0009] Further, one of the two steam inlet assemblies is connected with the first steam air extractor and the second steam air extractor, and the other is connected with the steam seal air extractor.

[0010] Further, the shell and the first steam air extractor, the second steam air extractor and the steam seal air extractor are respectively provided with screw plugs, wherein three screw plugs are arranged above the shell, and the four sealed chambers are communicated by unscrewing the three screw plugs.

[0011] Further, when the combined air extractor is running, the screw plug arranged on the connecting pipe of the steam seal air extractor is unscrewed to connect the internal vacuum areas of the first steam air extractor and the second steam air extractor with the four sealed chambers, so that the air in the four sealed chambers is automatically sucked away to form a sealed area with a certain vacuum degree.

[0012] The present application has the following advantages:

[0013] The structure of the present application can fully utilize the characteristics of the air extractor body to create a vacuum area to block the noise transmission path.

[0014] The use of the structure can effectively improve the problem of high noise encountered by the existing combined air extractor. It has a wide application prospect in marine air extractors. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 The existing combined air extractor

[0016] Figure 2 is the structure front view of the combined air extractor with vacuum noise reduction of the present application;

[0017] Figure 3 isFigure 2 The right view;

[0018] Figure 4 yes Figure 2 Top view;

[0019] Figure 5 This is an exploded view of the combined vacuum pump structure of the present invention, which employs vacuum noise reduction.

[0020] Figure 6 This is a schematic diagram showing the screw plug installation on the casing and the steam ejector. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0022] like Figures 2 to 5 As shown, the present invention provides a combined vacuum ejector with noise reduction, which enables low-noise operation of the combined ejector. It mainly consists of a primary steam ejector 1, a secondary steam ejector 2, a steam seal ejector 3, a top cover 4, a connecting pipe 5, a baffle 6, a steam inlet assembly 7, a vent valve 8, a housing 9, a tube bundle 10, and a bottom water chamber 11.

[0023] The primary steam ejector 1, secondary steam ejector 2, and steam seal ejector 3 are installed above the housing 9. The outlet of the steam ejector is connected to the housing 9 via a connecting pipe 5, and a baffle 6 is installed on its outer side. The bottom water chamber 11, tube bundle 10 (and tube sheet) are bolted together and installed below the housing 9. Two steam inlet assemblies 7 are placed above the upper cover plate of the housing 9; one steam inlet assembly 7 is connected to the primary steam ejector 1 and secondary steam ejector 2, and the other steam inlet assembly 7 is connected to the steam seal ejector 3. The vent valve 8 is installed above the housing 9. The top cover 4 is installed above the housing 9.

[0024] This structure creates four sealed chambers inside the ejector: the area between the inlet pipe of the first-stage steam ejector 1 and the housing 9; the area between the inlet pipe of the second-stage steam ejector 2 and the housing 9 (labeled as sealed chamber two 13 in the figure); the area between the inlet pipe of the steam-sealed ejector 3 and the housing 9 (labeled as sealed chamber three 14 in the figure); and the area between the top cover 4 and the housing 9 (labeled as sealed area four 15 in the figure). These four areas contain the three steam ejectors, the steam inlet assembly, the inlet pipe, and other main noise-generating components.

[0025] like Figure 6As shown, four plugs are installed on the housing 9 and the first-stage steam ejector 1 and the second-stage steam ejector 2, with plugs 16, 17, and 18 located on top of the housing 9. Unscrewing these three plugs connects sealing chamber 1, sealing chamber 2 13, and sealing chamber 3 14 to sealing chamber 4 15, respectively. Plug 4 19 is located on the connecting pipe of the steam ejector 3, where the pressure is lower than atmospheric pressure. During operation of the combined ejector, unscrewing plug 4 19 connects the vacuum area inside the steam ejector to sealing chambers 1-4. The air in sealing chambers 1-4 is automatically drawn away, forming a sealed area with a certain degree of vacuum. Noise propagating outward must first pass through the vacuum area, then through the top cover and baffle before it can be transmitted outward. The longer the propagation path, the weaker the noise received from the outside.

[0026] During installation, first fix the housing to the mounting base, then install the tube bundle and tube sheet below the housing, and the bottom water chamber plate below the housing. The steam ejector, steam inlet assembly, and vent valve are all installed above the housing. Connecting pipes and baffles are installed on the side of the combined ejector. The top cover is installed at the very top.

Claims

1. A combined steam ejector with vacuum de-noising comprising a primary steam jet ejector, a secondary steam jet ejector, a steam seal ejector, a top housing, a connecting pipe, a baffle, a steam inlet assembly, a vent valve, a casing, a tube bundle and a bottom water chamber, characterized in that: Two steam inlet assemblies are placed above the upper cover plate of the shell, the emptying valve is installed above the shell, and the top cover is installed above the shell; the first steam jet air extractor, the second steam jet air extractor, and the steam seal air extractor are respectively installed above the shell, the outlets of the first steam jet air extractor, the second steam jet air extractor, and the steam seal air extractor are respectively connected with the shell through connecting pipes, and baffles are installed outside to form four sealed chambers in the areas between the connecting pipes of the first steam jet air extractor and the shell, the connecting pipes of the second steam jet air extractor and the shell, the connecting pipes of the steam seal air extractor and the shell, and the area between the top cover and the shell, so as to block the noise transmission path; one of the two steam inlet assemblies is connected with the first steam jet air extractor and the second steam jet air extractor, and the other is connected with the steam seal air extractor; the shell, the first steam jet air extractor, the second steam jet air extractor, and the steam seal air extractor are respectively provided with screw plugs, wherein three screw plugs are arranged above the shell, and the four sealed chambers are connected through the three screw plugs after being unscrewed; when the combined air extractor is running, the screw plug arranged on the connecting pipe of the steam seal air extractor is unscrewed to connect the internal vacuum areas of the first steam jet air extractor and the second steam jet air extractor with the four sealed chambers, so that the air in the four sealed chambers is automatically sucked away to form a sealed area with a certain vacuum degree.

2. The combination air damper with vacuum noise reduction according to claim 1, characterized in that: The tube bundle and the bottom water chamber are fixedly installed below the shell through the tube plate and the bottom water chamber plate by bolts.

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