Multi-pipe steam-jet water-jet mixed condensation combined vacuum pump

By designing a multi-tube steam-water mixing and condensation combined vacuum pump, and using pressure sensors and motors to control steam flow, the risk of storage container explosions has been solved, achieving safe production and energy consumption optimization.

CN223894571UActive Publication Date: 2026-02-10CHONGQING YANZHANG TECH CO LTD
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Patent Information

Application Number
CN202520800372.6
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2025-04-25
Publication Date
2026-02-10
Estimated Expiration
2035-04-25

AI Technical Summary

Technical Problem

During operation, the storage container of the existing vacuum pump cannot effectively store a large amount of high-pressure steam, which poses a risk of explosion when the pressure is too high, resulting in significant safety hazards in production.

Method used

Design a multi-tube steam-water mixing and condensation combined vacuum pump. The steam flow rate is monitored by a pressure sensor, the motor is started to control the gear rotation, and the steam outlet is adjusted to reduce the amount of steam entering and avoid excessive pressure in the storage container.

Benefits of technology

Effectively controlling the amount of steam entering the system can prevent storage containers from exploding, reduce safety hazards, decrease the probability of accidents, improve system production capacity, and save energy.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to the technical field of vacuum pumps, in particular to a multi-pipe steam-jet water-jet mixed condensation combined vacuum pump, which comprises a steam ejector. The device further comprises a pressure sensor, a positioning ring, a spring, a movable disc, a push rod and an annular shell sleeve, an input port of the steam ejector is fixedly connected with a steam guide-in pipe, and the steam guide-in pipe is connected with a first gas conveying pipe through a flange; the pressure sensor is used for receiving the pressure caused by steam pushing the movable disc, when the pressure is too large, the motor is started to drive the second gear to rotate, the first gear drives the annular shell sleeve to rotate, and the joint notch of the second air outlet groove and the second air outlet groove is controlled to be narrowed, so that the steam flow is effectively controlled; and the situation that a storage container in the steam ejector cannot store more high-pressure steam is avoided, so that the risk of explosion of the storage container is avoided, the hidden danger of safety production is reduced, the accident occurrence probability is reduced, and the property loss and casualties are reduced.
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Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, and in particular to a multi-tube vapor-jet-water mixing and condensation combined vacuum pump. Background Technology

[0002] A vacuum pump is a vacuum-generating device that applies jet technology to the field of heat transfer. It mainly includes three types: single-tube vacuum devices or vacuum pumps, water-ejector single-tube vacuum pumps, and water-jet steam ejectors. They are generally simple in structure, require little investment, and are safe and reliable in operation. They are widely used in industries such as power plants, vacuum salt production, caustic soda, pesticides, pharmaceuticals, and chemicals.

[0003] The main problems encountered by existing vacuum pumps during use are as follows: When a large amount of high-pressure steam enters the steam jet pump, a large amount of low-pressure steam is needed to mix with the high-pressure steam in order to improve the thermal utilization rate. However, the pressure of the high-pressure steam is not stable enough. When the high-pressure steam flows outward at a fast speed, the amount of steam discharged from the storage container connected to one end of the steam jet pump is much less than the amount of steam entering. The storage container cannot store a large amount of high-pressure steam. When the internal pressure of the storage container is high, there is a risk that the storage container may explode, thus posing a significant safety hazard.

[0004] Therefore, to address the issues encountered by existing vacuum pumps during use, such as the storage container's inability to store large amounts of high-pressure steam and the risk of explosion when the internal pressure of the storage container is high, posing a significant safety hazard, a multi-tube steam-water jet mixing and condensation combined vacuum pump can be designed. This pump automatically monitors and controls the amount of steam entering the container to maintain a stable gas pressure, preventing explosions due to excessive pressure. This avoids safety accidents caused by such problems during vacuum pump use, reducing property damage and personal injury. Utility Model Content

[0005] To overcome the problems encountered by existing vacuum pumps during use, such as the storage container's inability to store large amounts of high-pressure steam, and the risk of explosion when the internal pressure of the storage container is high, thus posing a significant safety hazard to production.

[0006] The technical solution of this utility model is as follows: a multi-tube steam-water jet mixing and condensation combined vacuum pump, including a steam ejector; it also includes a pressure sensor, a positioning ring, a spring, a movable disc, a push rod, and an annular shell. A steam inlet pipe is fixedly connected to the inlet of the steam ejector. A gas delivery pipe is connected to the steam inlet pipe via a flange. A gas delivery pipe is fixedly connected to the end of the gas delivery pipe away from the steam inlet pipe. A sleeve is connected to the upper end of the gas delivery pipe. A cross-shaped fixing plate is fixedly connected to the lower inner side of the sleeve. A fixing cylinder with an upper opening is provided on the upper side of the cross-shaped fixing plate. A pressure sensor is fixedly connected to the bottom inner side of the fixing cylinder. An annular cylinder with openings at both ends is connected to the upper end of the fixing cylinder. A positioning ring is provided at the bottom inner side of the annular cylinder. Four springs are fixedly connected to the upper end of the positioning ring. A movable disc is fixedly connected to the end of the four springs away from the positioning ring. A push rod is fixedly connected to the bottom center of the movable disc. An annular shell is movably fitted on the outer side of the annular cylinder. Six air outlet slots are opened on the outer side of the annular cylinder. Six air outlet slots corresponding to the first air outlet slots are opened on the outer side of the annular shell. A gear is fixedly connected to the bottom outer side of the annular shell. A fixed box is fixedly connected to the left side of the outer side of the annular cylinder. A motor electrically connected to the pressure sensor is fixedly installed inside the fixed box. The output shaft of the motor passes through the upper wall of the fixed box and is fixedly connected to the second gear. The second gear meshes with the first gear.

[0007] Preferably, when steam is introduced into the annular cylinder through the second gas supply pipe, if the steam flow rate is too large, it will push the movable disc to continue moving downward. At this time, the spring is further compressed, and the push rod continues to move downward, touching the pressure sensor on the bottom side of the fixed cylinder. When the pressure sensor receives a set value, it will start the motor to drive the second gear to rotate at a certain angle. The second gear drives the meshing gear one to rotate, which in turn drives the annular shell to rotate. At this time, the various outlet grooves on the outer side of the annular shell are partially offset from the outlet grooves on the outer side of the annular cylinder, resulting in a narrowing of the outlet grooves. This reduces the amount of gas flowing into the sleeve, thus reducing the amount of gas flowing into the steam ejector. This achieves constant adjustment of the appropriate amount of steam entering, preventing the storage container in the steam ejector from being unable to store a large amount of high-pressure steam, thereby avoiding the risk of storage container explosion, reducing safety hazards, reducing the probability of accidents, and thus reducing property damage and casualties. The pressure sensor used in this device is model CYYZ11.

[0008] Preferably, a push plate is fixedly connected to the bottom of the push rod, and an elastic pad is fixedly connected to the bottom of the push plate. The push rod pushes the push plate downward, and the elastic pad on the push plate squeezes the pressure sensor.

[0009] Preferably, a fixing ring one is fixedly connected to the outer side of the upper end of the fixed cylinder, and a fixing ring two is fixedly connected to the outer side of the bottom of the annular cylinder. The fixing ring one and the fixing ring two are fixedly connected by bolts. The bolt connection method of the fixing ring one and the fixing ring two facilitates the disassembly and assembly of the fixed cylinder and the annular cylinder, thereby facilitating the maintenance and replacement of internal components.

[0010] Preferably, the bottom of the positioning ring is fixedly connected with four ear seats, and the upper end of the fixed cylinder is provided with four embedding slots. Each ear seat is set inside the corresponding embedding slot and fixed to the fixed cylinder by bolts. The ear seats facilitate the installation of the positioning ring inside the fixed cylinder for operation.

[0011] Preferably, a second limiting ring and a first limiting ring are fixedly connected to the upper and lower ends of the outer side of the annular cylinder, respectively. The annular shell is positioned between the second limiting ring and the first limiting ring, which restrict the annular shell to the outside of the annular cylinder to prevent accidental detachment.

[0012] Preferably, the upper end of the sleeve is fixedly connected to a cap by bolts, and the upper end of the annular cylinder is fixedly connected to a second gas supply pipe. The center of the sleeve has an opening for the second gas supply pipe to pass through. The outer and inner rings at the bottom of the sleeve are respectively fixedly connected to a first sealing ring and a second sealing ring. The cap seals the upper end of the sleeve, and the first and second sealing rings improve the sealing performance at the connection between the cap and the sleeve, preventing gas leakage.

[0013] Preferably, six connecting pipes are fixedly connected to the output port of the steam ejector. The bottom of the six connecting pipes is connected to the main pipe. The end of the main pipe away from the connecting pipes is fixedly connected to the condenser. A water ejector is connected to the upper right side of the condenser. The output port of the water ejector is fixedly connected to six connecting pipes. The bottom of the six connecting pipes is fixedly connected to the main pipe. This device adopts multi-pipe injection. Through the multi-stage combination of steam injection and water injection, as well as multi-pipe technology, the steam extraction capacity is greatly improved, the vacuum system reaches the ultimate vacuum, the equipment back pressure is increased, the overall system production capacity is greatly improved, and energy consumption is saved and the unit consumption ratio is reduced.

[0014] Preferably, three support legs are fixedly connected to the bottom outer side of the condenser, and support plates are fixedly connected to the bottom of the three support legs, so that the device is fixedly supported by the support legs and support plates.

[0015] The beneficial effects of this utility model are:

[0016] 1. When the steam flow rate introduced into the annular cylinder from the second gas supply pipe is too large, it will push the movable plate to continue to move downward. At this time, the spring is further compressed, and the push rod continues to move downward. The elastic pad at the bottom of the push plate touches and squeezes the pressure sensor on the bottom side of the fixed cylinder. When the pressure sensor receives the pressure value, it will start the motor to drive the second gear to rotate at a certain angle. The second gear drives the meshing gear one to rotate, which in turn drives the annular shell to rotate. At this time, the various gas outlet grooves on the outer side of the annular shell and the gas outlet groove one on the outer side of the annular cylinder are offset from each other, resulting in the narrowing of the gas outlet groove. At this time, the amount of gas flowing into the sleeve is reduced, and the amount of gas flowing into the steam ejector from the sleeve is reduced. This achieves the goal of constantly adjusting the appropriate amount of steam entering, avoiding the storage container in the steam ejector from being unable to store a large amount of high-pressure steam, thereby avoiding the risk of storage container explosion, reducing safety hazards, reducing the probability of accidents, and thus reducing property damage and casualties.

[0017] 2. The fixed cylinder, annular cylinder, sleeve and other components in the device are mostly connected by bolts, which makes it easy to assemble and operate, and facilitates the maintenance and replacement of each component to maintain the normal use of the device. Attached Figure Description

[0018] Figure 1 The diagram shown is a three-dimensional structural schematic of a multi-tube steam-water jet mixing and condensation combined vacuum pump according to this utility model.

[0019] Figure 2 The diagram shows the external structure of the sleeve of a multi-tube steam-water jet mixing and condensation combined vacuum pump according to this utility model.

[0020] Figure 3 The diagram shows the internal structure of the sleeve of a multi-tube steam-water jet mixing and condensation combined vacuum pump according to this utility model.

[0021] Figure 4 The diagram shows a schematic of the annular cylinder structure of a multi-tube steam-water jet mixing and condensation combined vacuum pump according to this utility model.

[0022] Figure 5 The diagram shown is a schematic diagram of the annular casing structure of a multi-tube steam-water jet mixing and condensation combined vacuum pump according to this utility model.

[0023] Figure 6 The diagram shows the external structure of the fixed cylinder of a multi-tube steam-water jet mixing and condensation combined vacuum pump according to this utility model.

[0024] Figure 7 The diagram shows the positioning ring structure of a multi-tube steam-water jet mixing and condensation combined vacuum pump according to this utility model.

[0025] Figure 8 The diagram shows the internal structure of the fixed cylinder of a multi-tube steam-water jet mixing and condensation combined vacuum pump according to this utility model.

[0026] Figure 9 The diagram shown is a schematic diagram of the bottom structure of the cover of a multi-tube jet steam-jet water mixing and condensation combined vacuum pump according to this utility model.

[0027] Explanation of reference numerals in the attached drawings: 1. Steam ejector; 2. Steam inlet pipe; 3. Gas supply pipe one; 4. Sleeve; 5. Cross-shaped fixing plate; 6. Fixing cylinder; 7. Pressure sensor; 8. Annular cylinder; 9. Positioning ring; 10. Spring; 11. Movable disc; 12. Push rod; 13. Annular housing; 14. Gas outlet groove one; 15. Gas outlet groove two; 16. Push plate; 17. Elastic pad; 18. Gear one; 19. Fixing box; 20. Motor; 1. Gear II; 22. Fixing Ring I; 23. Fixing Ring II; 24. Limiting Ring I; 25. Limiting Ring II; 26. Gas Pipe II; 27. Ear Seat; 28. Embedded Groove; 29. ​​Cover; 30. Sealing Ring I; 31. Sealing Ring II; 32. Opening; 33. Connecting Pipe I; 34. Main Pipe I; 35. Condenser; 36. Water Jet; 37. Connecting Pipe II; 38. Main Pipe II; 39. Support Leg; 40. Support Plate. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] Please see Figures 1-9This utility model provides an embodiment: a multi-tube steam-water mixing and condensation combined vacuum pump, including a steam ejector 1; it also includes a pressure sensor 7, a positioning ring 9, a spring 10, a movable disc 11, a push rod 12, and an annular shell 13. A steam inlet pipe 2 is fixedly connected to the inlet of the steam ejector 1. A gas delivery pipe 3 is connected to the steam inlet pipe 2 via a flange. A gas delivery pipe 3 is fixedly connected to the end of the gas delivery pipe 3 away from the steam inlet pipe 2. A sleeve 4 is connected to the upper end of the gas delivery pipe 3. A cross-shaped fixing plate 5 is fixedly connected to the lower inner side of the sleeve 4. A fixing cylinder 6 with an upper opening is provided on the upper side of the cross-shaped fixing plate 5. The bottom inner side of the fixing cylinder 6 is fixedly connected to... The device includes a pressure sensor 7, a fixed cylinder 6 with an annular cylinder 8 having openings at both ends, a positioning ring 9 at the bottom inner side of the annular cylinder 8, four springs 10 fixedly connected to the upper end of the positioning ring 9, a movable disc 11 fixedly connected to the end of the four springs 10 away from the positioning ring 9, a push rod 12 fixedly connected to the bottom center of the movable disc 11, an annular shell 13 movably fitted on the outer side of the annular cylinder 8, six air outlet slots 14 on the outer side of the annular cylinder 8, six air outlet slots 15 corresponding to the air outlet slots 14 on the outer side of the annular shell 13, a gear 18 fixedly connected to the bottom outer side of the annular shell 13, and a fixed box 19 fixedly connected to the left outer side of the annular cylinder 8. A motor 20, electrically connected to a pressure sensor 7, is fixedly installed inside the fixed housing 19. The output shaft of the motor 20 extends through the upper wall of the fixed housing 19 and is fixedly connected to a gear 21. Gear 21 meshes with gear 18. When steam is introduced into the annular cylinder 8 through the gas supply pipe 26, if the steam flow rate is too large, it will push the movable disc 11 to continue moving downward. At this time, the spring 10 is further compressed, and the push rod 12 continues to move downward, touching the pressure sensor 7 on the bottom side inside the fixed cylinder 6. When the pressure received by the pressure sensor 7 reaches the set value, the motor 20 will be activated to drive gear 21 to rotate a certain angle. Gear 21 drives the meshing gear 18 to rotate. When the device moves, it drives the annular sleeve 13 to rotate. At this time, the air outlet grooves 15 on the outer side of the annular sleeve 13 and the air outlet groove 14 on the outer side of the annular cylinder 8 are offset from each other, resulting in a narrower air outlet. As a result, the amount of gas flowing into the sleeve 4 decreases, and the amount of gas flowing into the steam ejector 1 from the sleeve 4 decreases. This allows for constant adjustment of the appropriate amount of steam entering the device, preventing the storage container in the steam ejector 1 from being unable to store a large amount of high-pressure steam. This avoids the risk of the storage container exploding, reduces potential safety hazards, reduces the probability of accidents, and thus reduces property damage and casualties. The pressure sensor 7 used in this device is model CYYZ11.

[0030] Please see Figures 2-9In this embodiment, a push plate 16 is fixedly connected to the bottom of the push rod 12, and an elastic pad 17 is fixedly connected to the bottom of the push plate 16. The push rod 12 pushes the push plate 16 downward, and the elastic pad 17 on the push plate 16 squeezes the pressure sensor 7. A fixing ring 12 is fixedly connected to the outer side of the upper end of the fixed cylinder 6, and a fixing ring 23 is fixedly connected to the outer side of the bottom of the annular cylinder 8. The fixing ring 122 and the fixing ring 23 are fixedly connected by bolts. The bolt connection of the fixing ring 122 and the fixing ring 23 facilitates the disassembly and assembly of the fixed cylinder 6 and the annular cylinder 8, thereby facilitating the maintenance and replacement of internal components. Four ear seats 27 are fixedly connected to the bottom of the positioning ring 9. Four embedding slots 28 are opened at the upper end of the fixed cylinder 6. Each ear seat 27 is set inside the corresponding embedding slot 28 and fixed to the fixed cylinder 6 by bolts. The ear seat 27 facilitates the installation of the positioning ring 9 inside the fixed cylinder 6 for operation. The upper and lower ends of the outer side of the annular cylinder 8 are respectively fixedly connected to the second limiting ring 25 and the first limiting ring 24. The annular shell 13 is set between the second limiting ring 25 and the first limiting ring 24. The second limiting ring 25 and the first limiting ring 24 restrict the annular shell 13 to the outside of the annular cylinder 8 to prevent accidental detachment. The upper end of the sleeve 4 is fixedly connected to the cap 29 by bolts. The upper end of the annular cylinder 8 is fixedly connected to the second gas supply pipe 26. The center of the sleeve 4 has an opening 32 for the second gas supply pipe 26 to pass through. The outer and inner rings at the bottom of the sleeve 4 are respectively fixedly connected to the first sealing ring 30 and the second sealing ring 31. The cap 29 seals the upper end of the sleeve 4. The first sealing ring 30 and the second sealing ring 31 improve the sealing performance at the connection between the cap 29 and the sleeve 4 to prevent gas leakage.

[0031] Please see Figure 1 In this embodiment, six connecting pipes 33 are fixedly connected to the output port of the steam ejector 1. The bottom of the six connecting pipes 33 is connected to a main pipe 34. The end of the main pipe 34 away from the connecting pipes 33 is fixedly connected to a condenser 35. A water ejector 36 is connected to the upper right side of the condenser 35. Six connecting pipes 37 are fixedly connected to the output port of the water ejector 36. The bottom of the six connecting pipes 37 is fixedly connected to a main pipe 38. This device adopts multi-pipe injection. Through the multi-stage combination of steam injection and water injection and multi-pipe technology, the steam extraction capacity is greatly improved, the vacuum system reaches the ultimate vacuum, the equipment back pressure is increased, the overall system production capacity is greatly improved, energy is saved, and the unit consumption ratio is reduced. Three support legs 39 are fixedly connected to the bottom outer side of the condenser 35. The bottom of the three support legs 39 is fixedly connected to a support plate 40. The support legs 39 and the support plate 40 fix and support the device.

[0032] During operation, when steam is introduced into the annular cylinder 8 through the second gas supply pipe 26, if the steam flow rate is too large, it will push the movable disc 11 to continue to move downward. At this time, the spring 10 is further compressed, and the push rod 12 continues to move downward. The elastic pad 17 at the bottom of the push plate 16 touches and squeezes the pressure sensor 7 on the bottom side of the fixed cylinder 6. When the pressure received by the pressure sensor 7 reaches the set value, the motor 20 will be started to drive the gear 21 to rotate at a certain angle. The gear 21 drives the meshing gear 18 to rotate, which in turn drives the annular shell 13 to rotate. At this time, the various air outlet grooves 15 on the outside of the annular shell 13 are offset from the air outlet groove 14 on the outside of the annular cylinder 8, resulting in a narrower air outlet. At this time, the amount of gas flowing into the sleeve 4 is reduced, and the amount of gas flowing into the steam ejector 1 from the sleeve 4 is reduced, thus effectively controlling and regulating the amount of steam entering.

[0033] Through the above steps, the incoming steam pushes the movable plate 11 downwards, and the push rod 12 pushes the elastic pad 17 at the bottom of the push plate 16 to touch and squeeze the pressure sensor 7. When the pressure is too high, the motor 20 is started to drive the gear 21 to rotate at a certain angle. The gear 21 drives the meshing gear 18 to rotate, and the annular shell 13 rotates so that the outlet groove 2 15 and the outlet groove 1 14 are offset from each other, controlling the outlet groove to narrow, thereby controlling the steam flow into the sleeve 4, and thus controlling the steam flow into the steam ejector 1. This achieves effective control and adjustment at all times, avoiding the storage container in the steam ejector 1 from being unable to store a large amount of high-pressure steam, thereby avoiding the risk of the storage container exploding, reducing safety hazards, reducing the probability of accidents, and reducing property damage and casualties. This solves the problem encountered by existing vacuum pumps in use, where the storage container cannot store a large amount of high-pressure steam, and when the internal pressure value of the storage container is high, there is a risk of the storage container exploding, which poses a significant safety hazard.

Claims

1. A multi-tube steam-water mixing and condensation combined vacuum pump, comprising a steam ejector (1); characterized in that: It also includes a pressure sensor (7), a positioning ring (9), a spring (10), a movable disc (11), a push rod (12), and an annular housing (13). The steam injector (1) is fixedly connected to a steam inlet pipe (2). The steam inlet pipe (2) is connected to a gas delivery pipe (3) via a flange. The end of the gas delivery pipe (3) away from the steam inlet pipe (2) is fixedly connected to a gas delivery pipe (3). The upper end of the gas delivery pipe (3) is connected to a sleeve (4). The lower inner side of the sleeve (4) is fixedly connected to a cross fixing plate (5). The upper side of the cross fixing plate (5) is provided with a fixing cylinder (6) with an upper opening. The bottom inner side of the fixing cylinder (6) is fixedly connected to a pressure sensor (7). The upper end of the fixing cylinder (6) is connected to an annular cylinder (8) with upper and lower openings. The bottom inner side of the annular cylinder (8) is provided with a positioning ring (9). The upper end of the positioning ring (9) is fixedly connected to four One spring (10), four springs (10) are fixedly connected to a movable disc (11) at the end away from the positioning ring (9), a push rod (12) is fixedly connected to the bottom center of the movable disc (11), an annular shell sleeve (13) is movably fitted on the outside of the annular cylinder (8), six air outlet slots (14) are opened on the outside of the annular cylinder (8), six air outlet slots (15) corresponding to the air outlet slots (14) are opened on the outside of the annular shell sleeve (13), a gear (18) is fixedly connected to the bottom of the outside of the annular shell sleeve (13), a fixed box (19) is fixedly connected to the left end of the outside of the annular cylinder (8), a motor (20) electrically connected to the pressure sensor (7) is fixedly installed in the fixed box (19), the output shaft of the motor (20) passes through the upper wall of the fixed box (19) and is fixedly connected to a gear (21), and the gear (21) meshes with the gear (18).

2. The multi-tube steam-water jet mixing and condensation combined vacuum pump according to claim 1, characterized in that: The bottom of the push rod (12) is fixedly connected to the push plate (16), and the bottom of the push plate (16) is fixedly connected to the elastic pad (17).

3. The multi-tube steam-water jet mixing and condensation combined vacuum pump according to claim 1, characterized in that: A fixing ring 1 (22) is fixedly connected to the outer side of the upper end of the fixing cylinder (6), and a fixing ring 2 (23) is fixedly connected to the outer side of the bottom of the annular cylinder (8). The fixing ring 1 (22) and the fixing ring 2 (23) are fixedly connected by bolts.

4. A multi-tube steam-water jet mixing and condensation combined vacuum pump according to claim 1, characterized in that: The bottom of the positioning ring (9) is fixedly connected with four ear seats (27), and the upper end of the fixing cylinder (6) is provided with four embedding slots (28). Each ear seat (27) is set inside the corresponding embedding slot (28) and fixed to the fixing cylinder (6) by bolts.

5. A multi-tube steam-water jet mixing and condensation combined vacuum pump according to claim 1, characterized in that: The upper and lower ends of the outer side of the annular cylinder (8) are fixedly connected to the second limiting ring (25) and the first limiting ring (24), respectively, and the annular shell (13) is set between the second limiting ring (25) and the first limiting ring (24).

6. A multi-tube steam-water jet mixing and condensation combined vacuum pump according to claim 1, characterized in that: The upper end of the sleeve (4) is fixedly connected to the cap (29) by bolts, and the upper end of the annular cylinder (8) is fixedly connected to the second gas pipe (26). The center of the sleeve (4) is provided with an opening (32) for the second gas pipe (26) to pass through. The outer and inner rings at the bottom of the sleeve (4) are respectively fixedly connected to the first sealing ring (30) and the second sealing ring (31).

7. A multi-tube steam-water jet mixing and condensation combined vacuum pump according to claim 1, characterized in that: Six connecting pipes (33) are fixedly connected to the outlet of the steam ejector (1). The bottom of the six connecting pipes (33) is connected to the main pipe (34). The end of the main pipe (34) away from the connecting pipes (33) is fixedly connected to the condenser (35). The upper right side of the condenser (35) is connected to the water ejector (36). The outlet of the water ejector (36) is fixedly connected to six connecting pipes (37). The bottom of the six connecting pipes (37) is fixedly connected to the main pipe (38).

8. A multi-tube steam-water jet mixing and condensation combined vacuum pump according to claim 7, characterized in that: Three support legs (39) are fixedly connected to the bottom outer side of the condenser (35), and a support plate (40) is fixedly connected to the bottom of the three support legs (39).