Vacuum pump with noise reduction function

Abstract

This utility model discloses a vacuum pump with noise reduction function, belonging to the field of vacuum pump technology. It includes a housing, with a vacuum pump fixedly installed inside the housing. A tubular heat exchanger for heating the liquid is fixedly connected above the vacuum pump. A steam ejector for increasing the inlet pressure of the vacuum pump is fixedly connected above the tubular heat exchanger. Through the cooperation of the tubular heat exchanger and the steam ejector, a vacuum is quickly established when the two vacuum pumps start up, and the inlet pressure is increased by the steam ejector, so that the difference between the vaporization temperature and the actual temperature of the working fluid in the vacuum pump reaches more than 10°C. This reduces cavitation and effectively mitigates the problems of low suction efficiency and poor vacuum sealing caused by cavitation. It also avoids severe vibration and harsh noise caused by cavitation, and, in conjunction with the tubular heat exchanger, reduces the impeller load, making its rotation more stable and reducing impeller vibration and airflow noise.

Description

Technical Field

[0001] This utility model relates to the field of vacuum pump technology, specifically a vacuum pump with noise reduction function. Background Technology

[0002] Vacuum jet pumps are simple in structure and have high performance, widely used in vacuum evaporation, vacuum distillation, vacuum drying, vacuum concentration, vacuum filtration, chemical absorption, degassing and other processes in industries such as chemical, light industry, food and petroleum.

[0003] Chinese patent discloses a vacuum pump (authorization announcement number CN222305222U), including a motor, a pump body installed on one side of the motor, and a frame fixed to the bottom of the motor and the pump body. An exhaust and drain pipe is fixedly connected to one side of the pump body. A filter element is provided inside the exhaust and drain pipe. A quick-release component is provided inside the filter element. A positioning component is provided inside the exhaust and drain pipe. The quick-release component includes a connecting rod that is movably sleeved inside the filter element. A limit block is fixedly connected to the top of the connecting rod and located at the top of the filter element. A bolt is fixedly connected to the bottom of the connecting rod and located at the bottom of the filter element.

[0004] When using the above-mentioned device, the working fluid temperature of the water ring vacuum pump, as a commonly used positive displacement vacuum pumping equipment, is easily affected by the ambient temperature. Especially in the high temperature of summer, the working fluid temperature is very easy to rise, which makes the water ring vacuum pump prone to cavitation. This not only seriously affects the pumping performance and makes the vacuum maintenance effect of the unit worse, making it difficult to adapt to the system that requires a stable vacuum for a long time, but also generates continuous noise when the single pump operates at high load for a long time. Therefore, this utility model provides a vacuum pump with noise reduction function to solve the above-mentioned problems. Utility Model Content

[0005] The purpose of this invention is to provide a vacuum pump with noise reduction function to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, this utility model provides the following technical solution:

[0007] A vacuum pump with noise reduction function includes a housing, in which a vacuum pump is fixedly installed. A tubular heat exchanger for heating a liquid is fixedly connected above the vacuum pump. A steam ejector for increasing the inlet pressure of the vacuum pump is fixedly connected above the tubular heat exchanger. Through the cooperation of the tubular heat exchanger and the steam ejector, the difference between the vaporization temperature of the working fluid inside the vacuum pump and the actual temperature of the working fluid is increased. The vacuum pump includes an impeller, and the impeller rotation draws and compresses a gas-vapor mixture. The impeller is eccentrically rotatably connected to the inner cavity of the vacuum pump.

[0008] As a further embodiment of this utility model, the outer wall of the impeller is rotatably connected to a pump casing for accommodating the impeller and forming a working chamber, and a motor for driving the impeller to rotate is fixedly connected to one side of the pump casing.

[0009] As a further embodiment of this utility model, the inner cavity of the shell is provided with a water storage tank for sound insulation. The water storage tank is filled with water for sound insulation, and the density characteristics of water are used to block the mechanical vibration and noise generated during the operation of the vacuum pump. The inner wall of the shell is fixedly connected with sound insulation cotton for absorbing high-frequency noise.

[0010] As a further embodiment of this utility model, a water storage shell is fixed in the inner cavity of the shell, and a sliding connecting plate for supporting the vacuum pump and buffering its vibration is slidably connected to the inner cavity of the water storage shell, and the inner cavity of the water storage shell is filled with water for shock absorption.

[0011] As a further embodiment of this utility model, the inner cavity of the water storage shell is rotatably connected to a main inclined rod, and a secondary inclined rod is rotatably connected to one side of the main inclined rod. Both the main inclined rod and the secondary inclined rod are rotatably connected to the bottom of the sliding connecting plate.

[0012] As a further embodiment of this utility model, both ends of the two sets of secondary inclined rods and the main inclined rods are rotatably connected by a pull rod for adjusting the angle between the secondary inclined rod and the main inclined rod. The outer walls of the two pull rods are slidably connected with a connecting shell for limiting the direction of movement of the pull rod. The inner cavity of the connecting shell is provided with a spring for pulling the pull rod to retract.

[0013] Compared with the prior art, the beneficial effects of this utility model are:

[0014] When in use, this invention rapidly establishes a vacuum upon startup by setting up two vacuum pumps and utilizes a steam ejector to increase the inlet pressure, ensuring that the vaporization temperature of the working fluid in the vacuum pump differs from the actual temperature by more than 10°C. This reduces cavitation and effectively mitigates the problems of low suction efficiency and poor vacuum sealing caused by cavitation, thus guaranteeing suction performance and unit vacuum maintenance. It is also better suited for systems requiring stable vacuum over extended periods. Simultaneously, it avoids severe vibrations and harsh noises caused by cavitation. Furthermore, the tubular heat exchanger reduces impeller load, making its rotation smoother and reducing impeller vibration and airflow noise. In addition, the water in the internal water tank and the sound insulation cotton form a double barrier, further enhancing the noise reduction effect and effectively reducing noise transmitted to the external environment. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a vacuum pump with noise reduction function.

[0016] Figure 2 This is a schematic diagram of the impeller in a vacuum pump with noise reduction function.

[0017] Figure 3 This is a schematic diagram of the casing of a vacuum pump with noise reduction function.

[0018] Figure 4 This is a schematic diagram of the tie rod in a vacuum pump with noise reduction function.

[0019] In the diagram: 1. Shell; 2. Vacuum pump; 3. Tubular heat exchanger; 4. Steam ejector; 101. Water tank; 102. Sound insulation cotton; 103. Water tank shell; 104. Sliding connecting plate; 105. Main inclined rod; 106. Secondary inclined rod; 107. Tie rod; 108. Connecting shell; 109. Spring; 201. Impeller; 202. Pump casing; 203. Motor; 204. Output pipe; 205. Liquid inlet pipe; 206. Gas delivery pipe. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1-2In this embodiment of the invention, a vacuum pump with noise reduction function includes a housing 1. A vacuum pump 2 is fixedly installed inside the housing 1. A tubular heat exchanger 3 for heating the liquid is fixedly connected above the vacuum pump 2. A hot well is provided below the tubular heat exchanger 3 for collecting condensate after treatment by the tubular heat exchanger 3 and for recycling the condensate through the hot well. A steam ejector 4 for increasing the inlet pressure of the vacuum pump 2 is fixedly connected above the tubular heat exchanger 3. Using steam as a driving source, a high-speed jet is formed in the steam ejector 4, combined with the compression and expansion of the medium, to create a vacuum and increase the inlet pressure of the water ring vacuum pump 2. There are two vacuum pumps 2 located below the steam ejector 4 and the tubular heat exchanger 3. The steam ejector 4 and the tubular heat exchanger 3 are connected by a pipe. The outlet of the tubular heat exchanger 3 is connected to the inlet of the two vacuum pumps 2. After the steam ejector 4 increases the inlet pressure of the vacuum pump 2, the vaporization temperature of the working fluid inside the vacuum pump 2 is increased. The actual temperature difference increases accordingly, reaching over 10℃, reducing cavitation in vacuum pump 2, avoiding vibration and noise caused by cavitation, and ensuring the service life and performance of vacuum pump 2. Vacuum pump 2 includes impeller 201, which draws in and compresses the gas-vapor mixture through rotation. Impeller 201 is eccentrically connected to the inner cavity of vacuum pump 2, so that when impeller 201 rotates eccentrically, it can form a rotating water ring with the working fluid in the inner cavity of vacuum pump 2. Through the space volume between the inner surface of the water ring and the blades of impeller 201, the gas-vapor mixture is drawn in during the first half of the impeller 201 rotation and compressed and discharged during the second half of the rotation, completing the vacuuming operation. At the same time, with the increase in inlet pressure from steam ejector 4 and the reduction in the amount of gas-vapor mixture from tubular heat exchanger 3, the airflow impact and load on impeller 201 are reduced, making impeller 201 rotate more smoothly, reducing noise caused by impeller 201 vibration and airflow disturbance, reducing impeller 201 wear, extending equipment life, and ensuring efficient and stable operation of vacuum pump 2.

[0022] Please see Figures 1-3The impeller 201 has a pump casing 202 rotatably connected to its outer wall to accommodate it and form a working chamber. The impeller 201 is eccentrically rotatably connected to the inner cavity of the pump casing 202. A motor 203 for driving the impeller 201 is fixedly connected to one side of the pump casing 202. The output shaft of the motor 203 passes through the pump casing 202 and is fixedly connected to the impeller 201. Specifically, an output pipe 204 for discharging the gas-air mixture compressed by the impeller 201 is fixedly connected to the top of the pump casing 202. A gas delivery pipe 206 for conveying gas is fixedly connected to one side of the output pipe 204. An inlet pipe 205 for replenishing working fluid into the pump is fixedly connected to the side of the pump casing 202. The inlet pipe 205 continuously provides water for the formation of the water ring, ensuring that the impeller 201 can stably form a rotating water ring when rotating, maintaining the function of suction and compression of the gas-vapor mixture. At the same time, it replenishes the water lost during operation, ensuring the efficient operation of the vacuum pump 2. In use, the impeller 201 can be driven to rotate eccentrically inside the pump casing 202 by the drive motor 203, so that the liquid inside the pump casing 202 forms a water ring, realizing the suction of the gas-vapor mixture, and the processed gas is discharged through the output pipe 204. The overall synergistic effect improves the vacuuming efficiency. With the assistance of the steam ejector 4 and the tubular heat exchanger 3, the load and vibration of the impeller 201 are reduced, improving the noise reduction effect and equipment stability of the device.

[0023] Please see Figure 1 and Figure 3 The inner cavity of the housing 1 is provided with a water storage tank 101 for sound insulation. Multiple water storage tanks 101 are provided and are located on multiple sides of the inner cavity of the housing 1, surrounding the outer side of the vacuum pump 2. The water storage tank 101 is filled with water for sound insulation, and the density characteristics of water are used to block the mechanical vibration and noise generated by the vacuum pump 2 during operation. Multiple sound insulation cotton 102 for absorbing high-frequency noise are fixedly connected to the inner wall of the housing 1. Multiple sound insulation cotton 102 are provided and fixedly connected to multiple sides of the inner cavity of the housing 1. Through the cooperation of the water storage tank 101 and the sound insulation cotton 102, the noise reduction effect of the overall device is enhanced and the operating environment of the equipment is improved.

[0024] Please see Figure 3 The inner cavity of the housing 1 is fixed with a water storage shell 103. The inner cavity of the water storage shell 103 is slidably connected with a sliding connecting plate 104 for supporting the vacuum pump 2 and buffering its vibration. The bottom of the vacuum pump 2 is fixedly connected to the sliding connecting plate 104. The inner cavity of the water storage shell 103 is filled with water for shock absorption. When the vacuum pump 2 vibrates during operation, the water buffering effect and the cooperation of the sliding connecting plate 104 effectively absorb the vibration generated by the vacuum pump 2 during operation, reduce the transmission of vibration to the housing 1 and external equipment, avoid secondary noise caused by vibration, further enhance the noise reduction effect of the device, and at the same time reduce the wear of the vacuum pump 2 itself and the connecting parts, extend the overall service life of the equipment, and ensure operational stability.

[0025] Please see Figures 3-4 A main inclined rod 105 is rotatably connected to the inner cavity of the water tank 103. A secondary inclined rod 106 is rotatably connected to one side of the main inclined rod 105. The secondary inclined rod 106 has the opposite inclination direction to the main inclined rod 105, and the intersection point of the secondary inclined rod 106 and the main inclined rod 105 is connected by a bearing. The main inclined rod 105 and the secondary inclined rod 106 form a group, and two groups are provided, extending downwards and rotatably connected by a connecting shaft. Both the main inclined rod 105 and the secondary inclined rod 106 are rotatably connected to the bottom of the sliding connecting plate 104. When the vacuum pump 2 vibrates and drives the sliding connecting plate 104 to move up and down, the intersection angle of the two groups of rods will change as the sliding connecting plate 104 moves because the main inclined rod 105 and the secondary inclined rod 106 have the opposite inclination direction and the intersection point is connected by a bearing. This angle adjustment disperses and buffers vibration energy, improves the vibration reduction and noise reduction effect of the equipment, and ensures the long-term stable operation of the vacuum pump 2.

[0026] Please see Figures 3-4 Both ends of the two sets of secondary inclined rods 106 and the main inclined rod 105 are rotatably connected by rotating rods to tie rods 107 for adjusting the angle between the secondary inclined rods 106 and the main inclined rod 105. Two tie rods 107 are provided; one tie rod 107 is rotatably connected to the lower secondary inclined rod 106 and the main inclined rod 105 on one side via a rotating rod, and the other tie rod 107 is rotatably connected to the upper secondary inclined rod 106 and the main inclined rod 105 on the other side via a rotating rod. Connecting shells 108 for limiting the movement direction of the tie rods 107 are slidably connected to the outer walls of both tie rods 107. The two connecting shells 108 are respectively fixedly connected to the bottom of the sliding connecting plate 104 and the bottom of the inner cavity of the water storage shell 103. The inner cavity of the connecting shell 108 is provided with… A spring 109 is used to pull the pull rod 107 to retract. When the vacuum pump 2 vibrates and drives the sliding connecting plate 104 to move up and down, it squeezes the main inclined rod 105 and the secondary inclined rod 106, causing the included angle between the main inclined rod 105 and the secondary inclined rod 106 to change. This pulls the pull rod 107 to slide within the connecting shell 108, while simultaneously stretching the spring 109. At the same time, the elastic force of the spring 109 will react and reset the pull rod 107. During this process, the elastic force of the spring 109 can absorb some of the vibration energy, reducing the transmission of vibration to the water storage shell 103 and the shell 1, assisting in the water inside the water storage shell 103 to reduce vibration, significantly reducing the vibration amplitude of the vacuum pump 2 during operation, effectively extending the service life of the equipment, and creating a stable operating environment for the vacuum pump 2.

[0027] The working principle of this utility model is as follows:

[0028] In use, this invention first generates steam via a steam ejector 4, using steam as the driving source. A vacuum is created through high-speed jetting and the compression and expansion of the medium, increasing the inlet pressure of the vacuum pump 2. This results in a temperature difference of over 10°C between the vaporization temperature of the working fluid in the vacuum pump 2 and the actual temperature. Then, a tubular heat exchanger 3 processes the steam and the steam-gas mixture, returning the condensed water droplets to the hot well below the vacuum pump 2. This reduces the amount of steam-gas mixture entering the vacuum pump 2, lowering the load on the impeller 201 and reducing airflow impact. The driving motor 203 then drives the impeller 201 to rotate eccentrically within the pump casing 202, causing the liquid inside the casing 202 to form a water ring, thus achieving the intake of the steam-gas mixture and its output. Pipe 204 discharges the processed gas, completing the vacuuming operation. In addition, during operation, the water inside the water tank 101 works with the sound insulation cotton 102 to block vibration and noise transmission, further reducing the noise of the vacuum pump 2. At the same time, when the vacuum pump 2 vibrates during operation, the water inside the water tank 103 can work with the secondary inclined rod 106 and the main inclined rod 105 to absorb the vibration generated by the vacuum pump 2 during operation. At the same time, the intersection angle of the two sets of rods will change accordingly. Meanwhile, the secondary inclined rod 106 and the main inclined rod 105 synchronously rotate to adjust the angle, assisting the water inside the water tank 103 to disperse and buffer vibration energy, improve the vibration reduction and noise reduction effect of the equipment, and ensure the long-term stable operation of the vacuum pump 2.

[0029] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A vacuum pump with noise reduction function, comprising a housing (1), characterized in that, A vacuum pump (2) is fixedly installed in the inner cavity of the housing (1). A tubular heat exchanger (3) for heating the liquid is fixedly connected above the vacuum pump (2). A steam ejector (4) for increasing the inlet pressure of the vacuum pump (2) is fixedly connected above the tubular heat exchanger (3). The difference between the vaporization temperature of the working liquid inside the vacuum pump (2) and the actual temperature of the working liquid is increased through the cooperation of the tubular heat exchanger (3) and the steam ejector (4). The vacuum pump (2) includes an impeller (201), and the impeller (201) rotates to draw and compress the gas-vapor mixture. The impeller (201) is eccentrically connected to the inner cavity of the vacuum pump (2).

2. A vacuum pump with noise reduction function according to claim 1, characterized in that, The outer wall of the impeller (201) is rotatably connected to a pump casing (202) for accommodating the impeller (201) and forming a working chamber. A motor (203) for driving the impeller (201) to rotate is fixedly connected to one side of the pump casing (202).

3. A vacuum pump with noise reduction function according to claim 1, characterized in that, The inner cavity of the housing (1) is provided with a water storage tank (101) for sound insulation. The water storage tank (101) is filled with water for sound insulation and uses the density characteristics of water to block the mechanical vibration and noise generated by the vacuum pump (2) during operation. The inner wall of the housing (1) is fixedly connected with sound insulation cotton (102) for absorbing high-frequency noise.

4. A vacuum pump with noise reduction function according to claim 1, characterized in that, The inner cavity of the housing (1) is fixed with a water storage shell (103), and the inner cavity of the water storage shell (103) is slidably connected with a sliding connecting plate (104) for bearing the vacuum pump (2) and buffering its vibration. The inner cavity of the water storage shell (103) is filled with water for shock absorption.

5. A vacuum pump with noise reduction function according to claim 4, characterized in that, The inner cavity of the water storage shell (103) is rotatably connected to a main inclined rod (105), and a secondary inclined rod (106) is rotatably connected to one side of the main inclined rod (105). Both the main inclined rod (105) and the secondary inclined rod (106) are rotatably connected to the bottom of the sliding connecting plate (104).

6. A vacuum pump with noise reduction function according to claim 5, characterized in that, Both ends of the two sets of secondary inclined rods (106) and the main inclined rod (105) are rotatably connected by a pull rod (107) for adjusting the angle between the secondary inclined rod (106) and the main inclined rod (105) via a rotating rod. The outer walls of the two pull rods (107) are slidably connected to a connecting shell (108) for limiting the movement direction of the pull rod (107). The inner cavity of the connecting shell (108) is provided with a spring (109) for pulling the pull rod (107) to retract.

Images