Integrated steam jet air extractor

Abstract

The invention discloses an integrated steam jet air extractor, and relates to the field of turbosets. The problems that due to the fact that an existing steam turbine unit is provided with a main air extractor and a steam seal air extractor which are independently arranged, the equipment size and the occupied space of the equipment in a cabin are large, a diffusion pipe is difficult to disassemble, a cooler pipe bundle of the equipment cannot be integrally disassembled, and the equipment maintenance cost and the use cost are high are solved. An integrated ejector tube box, an integrated integrated cooler and a cooling water distribution tube box are sequentially arranged from top to bottom, four stages of coolers are arranged in four cooler cavities respectively, and water outlets and water inlets in the lower ends of the four stages of coolers penetrate through a tube plate and are communicated with the cooling water distribution tube box. Three-stage diffusion pipes are inserted into the three diffusion pipe mounting holes in the cover plate respectively, and three-stage nozzles are inserted into the three nozzle mounting holes in the upper end plate of the ejector shell respectively. The disassembly convenience of the diffusion pipe is improved, the equipment size and the occupied space are reduced, and the equipment maintenance cost and the use cost are reduced.

Description

Technical Field

[0001] The invention relates to the field of steam turbine units, and in particular to an integrated steam ejector. Background Art

[0002] Steam jet vacuum pump means: after the steam from the system enters the Laval nozzle of the vacuum pump, the enthalpy value decreases, the speed increases, the thermal energy is converted into kinetic energy, and a supersonic high-speed jet is formed at the nozzle outlet. The high-speed jet sucks in the nearby air and other gases, so that the pressure near the nozzle outlet is reduced, thereby establishing and maintaining the required vacuum value. The mixed gas enters the cooler after being pressurized and decelerated through the diffusion tube, and undergoes surface heat exchange with the cooling water. After the steam is condensed, it flows back to the condenser through the drain pipe, and the exhaust steam is discharged through the check valve.

[0003] Steam turbine units are usually equipped with two types of steam jet vacuum pumps, namely: main vacuum pump and steam seal vacuum pump. Among them: the main vacuum pump is used to extract air and uncondensed steam in the condenser to maintain a high vacuum at the throat of the unit condenser; the steam seal vacuum pump is used to extract steam leakage from the steam seal and valve stem of the unit's main steam turbine, and can also receive shaft end and valve stem leakage of auxiliary equipment such as steam turbine generator sets, steam turbine circulating water pumps and steam turbine feed water pumps to maintain a low vacuum in the steam seal system. The two types of vacuum equipment have independent structures and operate independently without interfering with each other.

[0004] The main vacuum pump generally adopts a two-stage steam jet vacuum pump and a two-stage surface cooler. Its structure is as follows: Figure 4 and Figure 5 As shown, the main vacuum pump equipment mainly consists of a main vacuum pump I-stage cooler 106, a main vacuum pump II-stage cooler 103, a main vacuum pump I-stage vacuum pump 107, a main vacuum pump II-stage vacuum pump 104, an inlet water chamber 108, an outlet water chamber 101, a return water chamber 105, a check valve 102, etc.; the steam seal vacuum pump usually adopts a single-stage steam jet vacuum pump and a two-stage surface cooler structure, and its structural form is as follows Figure 6 and Figure 7 As shown, the steam seal vacuum pump equipment mainly consists of a steam seal vacuum pump I cooler 205, a steam seal vacuum pump II cooler 202, a vacuum pump 203, an inlet water chamber 206, an outlet water chamber 201, a return water chamber 204, etc. According to different overall project plans, the cooling water source can be condensed water from a condenser or seawater.

[0005] In summary, the existing steam turbine units are equipped with separately arranged main vacuum pumps and steam seal vacuum pumps, which have the problems of large equipment size and the space occupied in the cabin, difficulty in disassembling the diffuser tube, and inability to disassemble the cooler tube bundle of the equipment as a whole, resulting in high equipment maintenance costs and high use costs. Summary of the invention

[0006] The purpose of the present invention is to solve the problems that the existing steam turbine units are equipped with separately arranged main vacuum pumps and steam seal vacuum pumps, the equipment size and the space occupied in the cabin are large, the diffusion tube is difficult to disassemble, and the cooler tube bundle of the equipment cannot be disassembled as a whole, resulting in high equipment maintenance costs and use costs, and further provide an integrated steam jet vacuum pump.

[0007] The technical solution of the present invention is:

[0008] An integrated steam jet vacuum pump, characterized in that: the integrated steam jet vacuum pump comprises an integrated cooler 302, an integrated ejector pipe box 304, a cooling water distribution pipe box 301, a steam distributor and three steam pipelines 305, wherein the integrated ejector pipe box 304, the integrated cooler 302 and the cooling water distribution pipe box 301 are arranged in sequence from top to bottom;

[0009] The integrated cooler 302 includes a cooler shell 3021, a cover plate 3022, a tube sheet 3023, three cooler baffles 3024, a three-stage diffuser 3025, three guide tubes 3026 and a four-stage cooler 3027. The cooler shell 3021 is a square shell. The upper and lower ends of the cooler shell 3021 are respectively provided with a cover plate 3022 and a tube sheet 3023. The inside of the cooler shell 3021 is provided with three cooler baffles 3024 arranged vertically from left to right. The three cooler baffles 3024 divide the cooler shell 3021 into four independent cooler cavities. The four-stage coolers 3027 are respectively arranged in the four In each cooler cavity, the four-stage cooler 3027 is respectively composed of the first-stage cooler, the second-stage cooler, the third-stage cooler and the fourth-stage cooler from left to right. The water inlet and outlet at the lower end of the fourth-stage cooler 3027 pass through the tube sheet 3023 and are connected to the cooling water distribution pipe box 301. The cover plate 3022 above the first-stage cooler, the second-stage cooler and the third-stage cooler is respectively processed with three diffuser installation holes. The upper part of the third-stage diffuser 3025 is respectively inserted into the three diffuser installation holes on the cover plate 3022. The lower part of the third-stage diffuser 3025 is respectively inserted into the inside of the three guide tubes 3026. The tops of the three guide tubes 3026 are fixedly connected to the cover plate 3022.

[0010] The integrated ejector pipe box 304 includes an ejector housing 3041, a three-stage nozzle 3042, a three-stage mixing chamber 3043 and three ejector baffles 3044. The ejector housing 3041 is a rectangular parallelepiped housing. Three ejector baffles 3044 are arranged vertically from left to right in the ejector housing 3041. The three ejector baffles 3044 divide the ejector housing 3041 into four independent ejector cavities. The four ejector cavities correspond to the four cooler cavities one by one. The three-stage mixing chamber 3043 is respectively provided with In the three ejector cavities arranged corresponding to the first-stage cooler, the second-stage cooler and the third-stage cooler, vertically arranged third-stage nozzles 3042 are respectively arranged inside the third-stage mixing chamber 3043. The third-stage nozzles 3042 are respectively arranged coaxially with the third-stage diffusion pipe 3025. The upper end plate of the ejector housing 3041 above the third-stage mixing chamber 3043 is processed with three nozzle mounting holes. The upper part of the third-stage nozzle 3042 is respectively inserted into the three nozzle mounting holes;

[0011] The steam distributor includes a steam chamber 307 and a steam inlet chamber 303, both of which are arranged on the front shell wall of the one-piece integrated cooler 302. The steam chamber 307 is provided with two steam outlets, and the two steam outlets are respectively connected to the level I nozzle and the level II nozzle through two steam pipelines 305. The steam inlet chamber 303 is provided with a steam inlet outlet, and the steam inlet outlet is connected to the level III nozzle through the steam pipeline 305.

[0012] Furthermore, each stage of cooler 3027 includes a cooler tube bundle 30271, a plurality of tie rods 30272, a plurality of distance tubes 30273 and a plurality of baffles 30274. The cooler tube bundle 30271 adopts a U-shaped heat exchange tube, which is inverted in the cooler cavity. The lower end of the U-shaped heat exchange tube is inserted into the tube hole of the tube sheet 3023 and extends downward to the inner cavity of the cooling water distribution pipe box 301. The left and right sides of the guide tube 3026 are respectively provided with a plurality of tie rods 30272 arranged vertically. The tube sheet 3023 is processed with a plurality of tie rod connection threaded holes. The lower end of the tie rod 30272 is threadedly connected to the tube sheet 3023. The plurality of baffles 30274 are formed by They are arranged horizontally from top to bottom in the cooler cavity, and two adjacent baffles 30274 are staggered left and right. Multiple baffles 30274 divide the cooler cavity into a serpentine channel. The baffles 30274 are processed with heat exchange tube mounting holes for allowing U-shaped heat exchange tubes to pass through. The baffles 30274 are also processed with tie rod mounting holes for allowing tie rods 30272 to pass through. Multiple spacing tubes 30273 are mounted on the tie rods 30272. The upper ends of the spacing tubes 30273 are in contact with the lower surface of the upper baffle 30274, and the lower ends of the spacing tubes 30273 are in contact with the upper surface of the lower baffle 30274. A locking nut is installed on the upper end of the tie rod 30272.

[0013] Furthermore, the three-stage diffuser 3025 is placed at the center of the corresponding stages of coolers 3027, and the diffuser 3025 is parallel to the cooler tube bundle 30271.

[0014] Furthermore, the diffuser 3025 and the guide tube 3026 are clearance-matched, and the lower part of the inner surface of the guide tube 3026 is provided with four bosses evenly arranged along the circumferential direction, and the lower end surface of the diffuser 3025 is in contact with the top ends of the four bosses.

[0015] Furthermore, the integrated injector pipe box 304 also includes multiple adjustment gaskets. The nozzle mounting hole of the injector housing 3041 is a stepped hole. A nozzle connecting flange is provided on the upper part of the nozzle 3042. The nozzle connecting flange and the diameter of the nozzle connecting flange are equal to the diameter of the upper hole section of the nozzle mounting hole. A nozzle mounting hole is processed in the center of the adjustment gasket. The nozzle 3042 is vertically inserted in the lower hole section of the nozzle mounting hole. The nozzle connecting flange is located in the upper hole section of the nozzle mounting hole. An adjustment gasket is provided between the nozzle connecting flange and the bottom surface of the lower hole section of the nozzle mounting hole. The adjustment gasket is sleeved on the nozzle 3042.

[0016] Furthermore, a steam pipeline connecting flange is provided at the end of the steam pipeline 305, and the steam pipeline connecting flange, the nozzle connecting flange, the adjusting gasket and the upper end plate of the ejector shell 3041 are connected by a plurality of steam pipeline connecting bolts.

[0017] Furthermore, the integrated steam ejector also includes a check valve 306, and the stage II cooler is provided with a stage II cooler exhaust port, and the stage II cooler exhaust port is equipped with a check valve 306.

[0018] Furthermore, the cooling water distribution pipe box 301 includes a pipe box shell 3011 and a plurality of partition plates 3012. The interior of the pipe box shell 3011 is provided with a plurality of vertically arranged partition plates 3012 in sequence from left to right. Two adjacent partition plates 3012 are arranged alternately front to back. The pipe box shell 3011 forms a serpentine channel under the division of the plurality of partition plates 3012. The two cavities located at the left and right ends of the pipe box shell 3011 are respectively an inlet water chamber and an outlet water chamber, and the cavity between the inlet water chamber and the outlet water chamber is a return water chamber.

[0019] Furthermore, the steam distributor also includes two filters. A steam inlet is provided at the end of the steam chamber 307, and a steam inlet is provided at the end of the steam inlet chamber 303. Filters are built in at the steam inlet and the steam inlet.

[0020] Furthermore, the steam distributor also includes two valves, and two valves are arranged in the steam chamber 307 .

[0021] Compared with the prior art, the present invention has the following effects:

[0022] The integrated steam ejector of the present invention has the functions of both the main ejector and the steam seal ejector. It is used to replace the functions of the main ejector and the steam seal ejector in the original steam turbine unit to meet the operation requirements of the steam turbine unit. It has been verified by the load performance test of a certain unit and the effect is good. The scheme proposes an integrated integrated cooler, an integrated ejector pipe box, a single-arm suspended vibration-damping diffuser, a U-shaped heat exchange tube bundle that can be disassembled as a whole, and a square box cage-type structure support.

[0023] First, in previous steam turbine units, the main vacuum pump and the steam seal vacuum pump were separately provided and belonged to two types of equipment, each equipped with an independent cooler and cooling water system pipeline.

[0024] In this unit, an integrated steam jet vacuum extractor solution is adopted. The coolers originally belonging to the main vacuum extractor and the steam seal vacuum extractor are concentrated inside a square shell. Four-stage coolers are arranged inside the square shell. Each stage of coolers is separated by partitions. Reinforcing ribs are provided on both sides of the partitions. Compared with previous solutions, two system circulating water pipelines are reduced. At the same time, the space occupied by the equipment is greatly reduced, which is conducive to the arrangement of equipment in the cabin and more ample maintenance space.

[0025] Second, in previous steam turbine units, each stage of ejectors was placed in the main vacuum pump and the steam seal vacuum pump, independently of each other.

[0026] In this unit, the two-stage steam ejectors belonging to the main vacuum pump cover and the single-stage steam ejectors belonging to the steam seal vacuum pump cover are placed inside the upper pipe box at the same time, and are placed directly above their corresponding diffusers. In order to reduce the vibration noise generated by the supersonic fluid flow in the ejector, reinforcing ribs are provided inside and outside the pipe box along the axial direction of the ejector. At the same time, in order to ensure that the suction capacity of the ejector meets the design requirements, the distance between the ejector and the corresponding diffuser can be changed by the adjusting ring and adjusting gasket between the pipe box cover and the ejector.

[0027] Third, in previous steam turbine units, both sides of the diffuser were connected to the mixing chamber and the casing flange by studs, and were fixed relatively firmly.

[0028] In this unit, considering the convenience of disassembly of the diffuser and reducing the size of the equipment and the space it occupies, a single-arm suspended diffuser structure is adopted, that is, the upper part of the diffuser is connected to the upper cover plate by studs, while the lower part is suspended and cannot be fixed, causing the high-speed steam flow in the diffuser to impact the wall of the diffuser, thereby increasing the vibration energy level of the diffuser. In order to reduce the vibration energy level of the diffuser, a structural scheme of an external guide tube is introduced. A guide tube is added outside the diffuser. In addition to guiding the steam flow downward and preventing the steam flow from flowing back, the guide tube also has four guide grooves evenly distributed axially on the inner side of the guide tube. The gap between the guide groove and the outer wall of the diffuser is very small (1mm). When assembling the equipment, the two walls need to be grinded to ensure that the two walls can not only fit closely, weaken the vibration energy level of the diffuser, but also realize flexible disassembly of the diffuser.

[0029] Fourth, in previous steam turbine units, the coolers of the main vacuum pump and steam seal vacuum pump all adopted fixed tube sheet type, with tube sheets at both ends of the tube bundle. The tube sheets and the heat exchange tubes were connected by expansion or expansion welding. The tube bundle could not be disassembled as a whole. Once the number of blocked tubes exceeded the reserved margin, the cooler of the equipment must be replaced as a whole.

[0030] In this unit, a U-shaped heat exchange tube bundle that can be disassembled as a whole is adopted. The heat exchange tube is U-shaped, and both ends of the tube bundle are expanded and sealed and welded to the same tube sheet. When the corrosion of individual heat exchange tubes in the tube bundle is serious and exceeds the allowable value or the defect is deep and cannot be used any further, the heat exchange tube can be blocked. When there are many necrotic heat exchange tubes in the heat exchange tube bundle, which exceeds the allowable use range and cannot be used any further, the heat exchange tube bundle together with the tube sheet can be pulled out from the lower part of the shell and replaced with new assembled parts, and the equipment can continue to be used. Therefore, the maintenance plan is more flexible, and the equipment maintenance cost and use cost are lower.

[0031] Fifth, in previous steam turbine units, the supports of the main vacuum pump and the steam seal vacuum pump are composed of a base plate and reinforcing ribs.

[0032] In this unit, a square box-cage structure support is adopted. The support is composed of a bottom plate, reinforcing ribs, pads, sealing plates, top plates, etc. The support is semi-closed as a whole. At the same time, the sealing plate, top plate, pads, reinforcing rib plates, etc. are welded together into one, which greatly improves the overall rigidity of the support and effectively reduces the vibration energy level of the equipment.

[0033] Sixth, in order to prevent the atmosphere from flowing back into the cooler and causing the unit to lose vacuum when the equipment fails to exhaust, a check valve is installed at the exhaust port of the Level II cooler; at the same time, exhaust ports are installed on the top pipe box and the upper part of the bottom pipe box of the equipment, and a drain port is installed at the bottom. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a front view of an integrated steam ejector according to the present invention;

[0035] Figure 2 It is a side view of an integrated steam ejector of the present invention;

[0036] Figure 3 yes Figure 2 Sectional view at AA;

[0037] Figure 4 is a front view of an existing main vacuum extractor;

[0038] Figure 5 is a side view of an existing main vacuum extractor;

[0039] Figure 6 It is the front view of the existing steam seal vacuum extractor;

[0040] Figure 7 It is a side view of an existing steam seal vacuum extractor.

[0041] In the figure: 101, outlet water chamber; 102, non-return valve; 103, main vacuum pump stage II cooler; 104, main vacuum pump stage II cooler; 105, return water chamber; 106, main vacuum pump stage I cooler; 107, main vacuum pump stage I cooler; 108, inlet water chamber; 201, outlet water chamber; 202, steam seal vacuum pump stage II cooler; 203, vacuum pump; 204, return water chamber; 205, steam seal vacuum pump stage I cooler; 206, inlet water chamber; 301, cooling water distribution pipe box; 3011, pipe box shell; 3012, partition plate; 302, integrated Integrated cooler; 3021, cooler shell; 3022, cover plate; 3023, tube sheet; 3024, cooler baffle; 3025, diffuser; 3026, guide tube; 3027, cooler; 30271, cooler tube bundle; 30272, pull rod; 30273, distance tube; 30274, baffle; 303, steam inlet chamber; 304, integrated ejector pipe box; 3041, ejector shell; 3042, nozzle; 3043, mixing chamber; 3044, ejector baffle; 305, steam pipeline; 306, check valve; 307, steam chamber. DETAILED DESCRIPTION

[0042] Specific implementation method 1: Combination Figures 1 to 3 The present embodiment is described. The present embodiment is an integrated steam ejector, characterized in that: the integrated steam ejector comprises an integrated cooler 302, an integrated ejector pipe box 304, a cooling water distribution pipe box 301, a steam distributor and three steam pipelines 305, and the integrated ejector pipe box 304, the integrated cooler 302 and the cooling water distribution pipe box 301 are arranged in sequence from top to bottom;

[0043] The integrated cooler 302 includes a cooler shell 3021, a cover plate 3022, a tube sheet 3023, three cooler baffles 3024, a three-stage diffuser 3025, three guide tubes 3026 and a four-stage cooler 3027. The cooler shell 3021 is a square shell. The upper and lower ends of the cooler shell 3021 are respectively provided with a cover plate 3022 and a tube sheet 3023. The inside of the cooler shell 3021 is provided with three cooler baffles 3024 arranged vertically from left to right. The three cooler baffles 3024 divide the cooler shell 3021 into four independent cooler cavities. The four-stage coolers 3027 are respectively arranged in the four In each cooler cavity, the four-stage cooler 3027 is respectively composed of the first-stage cooler, the second-stage cooler, the third-stage cooler and the fourth-stage cooler from left to right. The water inlet and outlet at the lower end of the fourth-stage cooler 3027 pass through the tube sheet 3023 and are connected to the cooling water distribution pipe box 301. The cover plate 3022 above the first-stage cooler, the second-stage cooler and the third-stage cooler is respectively processed with three diffuser installation holes. The upper part of the third-stage diffuser 3025 is respectively inserted into the three diffuser installation holes on the cover plate 3022. The lower part of the third-stage diffuser 3025 is respectively inserted into the inside of the three guide tubes 3026. The tops of the three guide tubes 3026 are fixedly connected to the cover plate 3022.

[0044] The integrated ejector pipe box 304 includes an ejector housing 3041, a three-stage nozzle 3042, a three-stage mixing chamber 3043 and three ejector baffles 3044. The ejector housing 3041 is a rectangular parallelepiped housing. Three ejector baffles 3044 are arranged vertically from left to right in the ejector housing 3041. The three ejector baffles 3044 divide the ejector housing 3041 into four independent ejector cavities. The four ejector cavities correspond to the four cooler cavities one by one. The three-stage mixing chamber 3043 is respectively provided with In the three ejector cavities arranged corresponding to the first-stage cooler, the second-stage cooler and the third-stage cooler, vertically arranged third-stage nozzles 3042 are respectively arranged inside the third-stage mixing chamber 3043. The third-stage nozzles 3042 are respectively arranged coaxially with the third-stage diffusion pipe 3025. The upper end plate of the ejector housing 3041 above the third-stage mixing chamber 3043 is processed with three nozzle mounting holes. The upper part of the third-stage nozzle 3042 is respectively inserted into the three nozzle mounting holes;

[0045] The steam distributor includes a steam chamber 307 and a steam inlet chamber 303, both of which are arranged on the front shell wall of the one-piece integrated cooler 302. The steam chamber 307 is provided with two steam outlets, and the two steam outlets are respectively connected to the level I nozzle and the level II nozzle through two steam pipelines 305. The steam inlet chamber 303 is provided with a steam inlet outlet, and the steam inlet outlet is connected to the level III nozzle through the steam pipeline 305.

[0046] In this embodiment, the coolers of the original main vacuum pump and the steam seal vacuum pump are integrated inside a square cooler shell 3021. The four-stage coolers 3027 arranged inside the cooler shell 3021 correspond to the two-stage coolers of the main vacuum pump and the steam seal vacuum pump respectively, and the coolers 3027 of each stage are separated by a cooler partition 3024.

[0047] In this embodiment, the two-stage ejector of the main vacuum pump and the single-stage ejector of the steam seal vacuum pump are integrated in an ejector housing 3041. The ejector is placed directly above the corresponding diffuser 3025. The ejector housing 3041 is divided into four areas by three ejector partitions 3044. The ejector housing 3041 is provided with inner and outer reinforcing ribs, and a vent is provided on the top of the ejector housing 3041.

[0048] In this embodiment, before the system steam enters the equipment, it enters the steam chamber 307 and the steam inlet chamber 303 through two branch pipes respectively. The steam chamber 307 provides steam supply to the two-stage nozzles of the main vacuum pump part, and the steam inlet chamber 303 provides steam supply to the nozzles of the steam seal vacuum pump part.

[0049] Specific implementation method 2: Combination Figures 1 to 3 The present embodiment is described. Each stage of the cooler 3027 of the present embodiment includes a cooler tube bundle 30271, a plurality of tie rods 30272, a plurality of distance tubes 30273 and a plurality of baffles 30274. The cooler tube bundle 30271 adopts a U-shaped heat exchange tube, which is inverted in the cooler cavity. The lower end of the U-shaped heat exchange tube is inserted into the tube hole of the tube sheet 3023 and extends downward to the inner cavity of the cooling water distribution pipe box 301. The left and right sides of the guide tube 3026 are respectively provided with a plurality of tie rods 30272 arranged vertically. The tube sheet 3023 is processed with a plurality of tie rod connection threaded holes. The lower end of the tie rod 30272 is threadedly connected to the tube sheet 3023. The plurality of baffles 30274 are 0274 are arranged horizontally in the cooler cavity from top to bottom, and two adjacent baffles 30274 are arranged alternately left and right. Multiple baffles 30274 divide the cooler cavity into serpentine channels. Heat exchange tube mounting holes for U-shaped heat exchange tubes are processed on the baffles 30274. Tie rod mounting holes for tie rods 30272 are also processed on the baffles 30274. Multiple distance tubes 30273 are mounted on the tie rods 30272. The upper ends of the distance tubes 30273 are in contact with the lower surface of the upper baffle 30274, and the lower ends of the distance tubes 30273 are in contact with the upper surface of the lower baffle 30274. Locking nuts are installed on the upper ends of the tie rods 30272. In this way, the cooler tube bundle 30271 adopts U-shaped heat exchange tubes, and the heat exchange tubes are connected to the baffles 30274 by tie rods 30272 and distance tubes 30273. Other components and connection relationships are the same as those in the first specific implementation mode.

[0050] In this embodiment, the heat exchange tubes and the tube sheet 3023 are connected by expansion welding and sealing welding.

[0051] Specific implementation method three: Combination Figures 1 to 3 To illustrate this embodiment, the three-stage diffuser 3025 of this embodiment is placed at the center of the corresponding coolers 3027, and the diffuser 3025 is parallel to the cooler tube bundle 30271. Other components and connection relationships are the same as those of the first or second embodiment.

[0052] Specific implementation method four: Combination Figures 1 to 3 This embodiment is described. The diffuser 3025 of this embodiment is clearance-matched with the guide tube 3026. The lower inner surface of the guide tube 3026 is provided with four bosses evenly arranged along the circumferential direction. The lower end surface of the diffuser 3025 contacts the top of the four bosses. With this arrangement, the upper part of the diffuser 3025 is fixed to the cover plate 3022 by studs, the lower part of the diffuser 3025 is tightly fitted with the guide tube 3026, and the four bosses evenly arranged along the circumferential direction inside the guide tube 3026 can effectively reduce the vibration energy level of the diffuser 3025. Other components and connection relationships are the same as those of the first, second or third embodiments.

[0053] Specific implementation method five: Combination Figures 1 to 3 To explain this embodiment, the integrated injector pipe box 304 of this embodiment also includes a plurality of adjustment gaskets. The nozzle mounting hole of the injector housing 3041 is a stepped hole. A nozzle connecting flange is provided on the upper part of the nozzle 3042. The nozzle connecting flange and the diameter of the nozzle connecting flange are equal to the diameter of the upper hole section of the nozzle mounting hole. A nozzle mounting hole is processed in the center of the adjustment gasket. The nozzle 3042 is vertically inserted in the lower hole section of the nozzle mounting hole. The nozzle connecting flange is located in the upper hole section of the nozzle mounting hole. An adjustment gasket is provided between the nozzle connecting flange and the bottom surface of the lower hole section of the nozzle mounting hole. The adjustment gasket is sleeved on the nozzle 3042. In this way, the spacing between the nozzle 3042 and the corresponding diffuser 3025 is changed by adjusting the gasket to ensure that the suction capacity required by the design is achieved. Other components and connection relationships are the same as those of the specific embodiments one, two, three or four.

[0054] Specific implementation method six: Combination Figures 1 to 3 To explain this embodiment, a steam pipeline connection flange is provided at the end of the steam pipeline 305 of this embodiment, and the steam pipeline connection flange, the nozzle connection flange, the adjustment gasket and the upper end plate of the ejector housing 3041 are connected by a plurality of steam pipeline connection bolts. Other components and connection relationships are the same as those of the specific embodiments 1, 2, 3, 4 or 5.

[0055] Specific implementation method seven: Combination Figures 1 to 3To explain this embodiment, the integrated steam ejector of this embodiment further includes a check valve 306, the second-stage cooler is provided with a second-stage cooler exhaust port, and the second-stage cooler exhaust port is equipped with a check valve 306. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five or six.

[0056] Specific implementation method eight: Combination Figures 1 to 3 To explain this embodiment, the cooling water distribution pipe box 301 of this embodiment includes a pipe box shell 3011 and a plurality of partition plates 3012. The pipe box shell 3011 is provided with a plurality of partition plates 3012 arranged vertically from left to right. Two adjacent partition plates 3012 are arranged alternately front and back. The pipe box shell 3011 forms a serpentine channel under the separation of the plurality of partition plates 3012. The two cavities located at the left and right ends of the pipe box shell 3011 are respectively the inlet water chamber and the outlet water chamber. The cavity between the inlet water chamber and the outlet water chamber is the return water chamber. With such a configuration, in order to increase the flow rate in the heat exchange tube and thus increase the heat transfer coefficient, a multi-flow structure is provided on the tube side. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six or seven.

[0057] In this embodiment, the inlet water chamber, outlet water chamber and return water chamber of the main vacuum pump and the steam seal vacuum pump are integrated in a pipe box shell 3011. The cooling water passes through the heat exchange tube bundle of the main vacuum pump and then passes through the heat exchange tube bundle of the steam seal vacuum pump, which greatly reduces the water consumption for cooling the equipment. The pipe box shell 3011 is provided with internal and external reinforcing ribs.

[0058] Specific implementation method nine: Combination Figures 1 to 3 To explain this embodiment, the steam distributor of this embodiment also includes two filters, a steam inlet is provided at the end of the steam chamber 307, and a steam inlet is provided at the end of the steam inlet chamber 303, and filters are built in at the steam inlet and the steam inlet. In this way, the built-in filter can prevent debris, welding slag, etc. in the system pipeline from entering the interior of the device and affecting the operation of the device. Other components and connection relationships are the same as those of the specific embodiments one, two, three, four, five, six, seven or eight.

[0059] Specific implementation method ten: Combination Figures 1 to 3 To explain this embodiment, the steam distributor of this embodiment also includes two valves, and two valves are provided in the steam chamber 307. In this way, two opening and closing gates are provided in the steam chamber 307. According to the needs of equipment operation, steam can be supplied to each level of vacuum pumps separately, or to a single set of parts separately, to meet the different functional operation requirements and parameter operation requirements of the system. Other components and connection relationships are the same as those of the first, second, third, fourth, fifth, sixth, seventh, eighth or ninth embodiments.

[0060] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An integrated steam ejector, characterized in that: The integrated steam ejector comprises an integrated cooler (302), an integrated ejector pipe box (304), a cooling water distribution pipe box (301), a steam distributor and three steam pipelines (305), wherein the integrated ejector pipe box (304), the integrated cooler (302) and the cooling water distribution pipe box (301) are arranged in sequence from top to bottom; The integrated cooler (302) comprises a cooler shell (3021), a cover plate (3022), a tube sheet (3023), three cooler baffles (3024), a three-stage diffuser (3025), three guide tubes (3026) and a four-stage cooler (3027). The cooler shell (3021) is a square shell. The upper and lower ends of the cooler shell (3021) are respectively provided with a cover plate (3022) and a tube sheet (3023). Three cooler baffles (3024) arranged vertically are sequentially arranged from left to right inside the cooler shell (3021). The three cooler baffles (3024) divide the cooler shell (3021) into four independent cooler cavities. The four-stage cooler (3027) The four coolers (3027) are respectively arranged in four cooler cavities. The four coolers (3027) are respectively arranged from left to right as the first cooler, the second cooler, the third cooler and the fourth cooler. The water inlet and outlet at the lower end of the fourth cooler (3027) pass through the tube plate (3023) and are connected to the cooling water distribution pipe box (301). The cover plate (3022) above the first cooler, the second cooler and the third cooler is respectively processed with three diffuser installation holes. The upper part of the third diffuser (3025) is respectively inserted into the three diffuser installation holes on the cover plate (3022). The lower part of the third diffuser (3025) is respectively inserted into the inside of the three guide tubes (3026). The top ends of the three guide tubes (3026) are fixedly connected to the cover plate (3022). The integrated ejector pipe box (304) comprises an ejector housing (3041), a three-stage nozzle (3042), a three-stage mixing chamber (3043) and three ejector baffles (3044). The ejector housing (3041) is a rectangular parallelepiped housing. Three ejector baffles (3044) are arranged vertically from left to right in the ejector housing (3041). The three ejector baffles (3044) divide the ejector housing (3041) into four independent ejector cavities. The four ejector cavities correspond to the four cooler cavities one by one. The three-stage mixing chamber (3043) is divided into The three-stage mixing chamber (3043) is respectively arranged in three ejector cavities corresponding to the first-stage cooler, the second-stage cooler and the third-stage cooler. The third-stage nozzles (3042) are arranged vertically inside the third-stage mixing chamber (3043). The third-stage nozzles (3042) are respectively arranged coaxially with the third-stage diffusion pipe (3025). The upper end plate of the ejector housing (3041) above the third-stage mixing chamber (3043) is processed with three nozzle mounting holes. The upper part of the third-stage nozzle (3042) is respectively inserted into the three nozzle mounting holes; The steam distributor comprises a steam chamber (307) and a steam inlet chamber (303), both of which are arranged on the front shell wall of the integrated cooler (302). The steam chamber (307) is provided with two steam outlets, which are respectively connected to the first-level nozzle and the second-level nozzle through two steam pipelines (305). The steam inlet chamber (303) is provided with a steam inlet outlet, which is connected to the third-level nozzle through the steam pipeline (305).

2. An integrated steam ejector according to claim 1, characterized in that: Each stage of the cooler (3027) includes a cooler tube bundle (30271), a plurality of tie rods (30272), a plurality of distance tubes (30273) and a plurality of baffles (30274). The cooler tube bundle (30271) uses a U-shaped heat exchange tube. The U-shaped heat exchange tube is inverted in the cooler cavity. The lower end of the U-shaped heat exchange tube is inserted into the tube hole of the tube plate (3023) and extends downward to the inner cavity of the cooling water distribution pipe box (301). The left and right sides of the guide tube (3026) are respectively provided with a plurality of tie rods (30272) arranged vertically. The tube plate (3023) is processed with a plurality of tie rod connection threaded holes. The lower end of the tie rod (30272) is threadedly connected to the tube plate (3023). The plurality of baffles (30274) are connected by They are arranged horizontally from top to bottom in the cooler cavity, and two adjacent baffles (30274) are arranged alternately left and right. Multiple baffles (30274) divide the cooler cavity into a serpentine channel. The baffles (30274) are processed with heat exchange tube mounting holes for allowing U-shaped heat exchange tubes to pass through. The baffles (30274) are also processed with tie rod mounting holes for allowing tie rods (30272) to pass through. Multiple spacing tubes (30273) are mounted on the tie rods (30272). The upper ends of the spacing tubes (30273) are in contact with the lower surface of the upper baffle (30274), and the lower ends of the spacing tubes (30273) are in contact with the upper surface of the lower baffle (30274). A locking nut is installed on the upper end of the tie rod (30272).

3. An integrated steam ejector according to claim 2, characterized in that: The three-stage diffuser (3025) is placed at the center of the corresponding coolers (3027) at each stage, and the diffuser (3025) is parallel to the cooler tube bundle (30271).

4. The integrated steam ejector according to claim 3, characterized in that: The diffuser (3025) and the guide tube (3026) are clearance-matched, and the lower part of the inner surface of the guide tube (3026) is provided with four bosses evenly arranged along the circumferential direction, and the lower end surface of the diffuser (3025) is in contact with the top ends of the four bosses.

5. The integrated steam ejector according to claim 4, characterized in that: The integrated injector pipe box (304) also includes a plurality of adjustment gaskets. The nozzle mounting hole of the injector housing (3041) is a stepped hole. A nozzle connecting flange is provided on the upper part of the nozzle (3042). The nozzle connecting flange and the diameter of the nozzle connecting flange are both equal to the diameter of the upper hole section of the nozzle mounting hole. A nozzle mounting hole is processed at the center of the adjustment gasket. The nozzle (3042) is vertically inserted in the lower hole section of the nozzle mounting hole. The nozzle connecting flange is located in the upper hole section of the nozzle mounting hole. An adjustment gasket is provided between the nozzle connecting flange and the bottom surface of the lower hole section of the nozzle mounting hole. The adjustment gasket is sleeved on the nozzle (3042).

6. The integrated steam ejector according to claim 5, characterized in that: A steam pipeline connecting flange is provided at the end of the steam pipeline (305), and the steam pipeline connecting flange, the nozzle connecting flange, the adjusting gasket and the upper end plate of the ejector shell (3041) are connected by a plurality of steam pipeline connecting bolts.

7. An integrated steam ejector according to claim 6, characterized in that: The integrated steam ejector also includes a check valve 306. The II-stage cooler is provided with an exhaust port of the II-stage cooler, and the exhaust port of the II-stage cooler is equipped with a check valve 306.

8. An integrated steam ejector according to claim 1 or 7, characterized in that: The cooling water distribution pipe box (301) comprises a pipe box shell (3011) and a plurality of partition plates (3012). The pipe box shell (3011) is provided with a plurality of partition plates (3012) arranged vertically in sequence from left to right. Two adjacent partition plates (3012) are arranged alternately front to back. The pipe box shell (3011) forms a serpentine channel under the separation of the plurality of partition plates (3012). The two cavities located at the left and right ends of the pipe box shell (3011) are respectively an inlet water chamber and an outlet water chamber, and the cavity between the inlet water chamber and the outlet water chamber is a return water chamber.

9. An integrated steam ejector according to claim 8, characterized in that: The steam distributor also includes two filters. A steam inlet is provided at the end of the steam chamber (307), and a steam inlet is provided at the end of the steam inlet chamber (303). Filters are built into the steam inlet and the steam inlet.

10. An integrated steam ejector according to claim 9, characterized in that: The steam distributor also includes two valves, and two valves are arranged in the steam chamber (307).

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