Automatic anti-cavitation device and water ring vacuum pump
By introducing an automatic anti-cavitation device into the water ring vacuum pump, the cavitation problem of the water ring vacuum pump under high temperature or insufficient cooling water is solved, and the safe and efficient operation of the equipment is achieved.
Patent Information
- Application Number
- CN202520728514.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-17
- Publication Date
- 2026-02-03
- Estimated Expiration
- 2035-04-17
AI Technical Summary
Water ring vacuum pumps are prone to cavitation when the temperature is high or the cooling water flow is insufficient, which can lead to impeller damage, vibration and noise, affecting the safe operation of the equipment.
An automatic anti-cavitation device is adopted, including an air inlet pipe, an air supply regulating valve, a pressure sensor, a temperature sensor, and a controller. By monitoring and adjusting the inlet pressure and liquid temperature of the water ring vacuum pump in real time, the amount of air supplied is controlled to prevent cavitation.
This enables long-term cavitation-free operation of the water ring vacuum pump, ensuring the safety and efficiency of the equipment, avoiding cavitation noise and impeller damage, and meeting the pumping requirements.
Smart Images
Figure CN223868169U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of water ring vacuum pumps, and in particular to an automatic anti-cavitation device and a water ring vacuum pump. Background Technology
[0002] Cavitation is a common phenomenon in fluid machinery. Due to localized low pressure in the water flow path, the liquid vaporizes in the low-pressure area, and a large number of microbubbles explode and grow. After the microbubbles grow rapidly, the water flows towards areas of higher pressure and suddenly collapses, causing a pressure impact of hundreds of atmospheres on the flow path wall, resulting in the peeling off of the wall material. The degree of liquid vaporization is related to the pressure and temperature. When the internal pressure of the liquid drops below the saturated vapor pressure of the liquid at that temperature, bubbles and vapor pores form in localized areas. When the pressure rises, the bubbles are suddenly crushed by the surrounding pressure, and the liquid flow, due to inertia, compresses towards the center of the bubbles at extremely high speeds, exerting a hydraulic impact on the equipment. This entire process of microbubble generation, decay, and the physical and chemical reactions on the flow surface can cause serious damage to the equipment.
[0003] For water ring vacuum pumps, long-term full-load operation, especially in summer when the cooling water temperature is high or the cooling water flow is too small, results in poor cooling effect of the vacuum pump heat exchanger. Under these conditions, the water ring vacuum pump will produce cavitation when operating under high vacuum. The working fluid in the pump will approach boiling and produce a large number of bubbles. The generation and collapse of the bubbles will cause cavitation damage to the pump impeller. The pitting surface will disrupt the dynamic balance of the impeller, causing strong vibration of the pump body and producing very loud cavitation noise. All of these conditions seriously affect the safe operation of the vacuum pump and the steam turbine generator set. Utility Model Content
[0004] To address the aforementioned technical problems, this application provides an automatic anti-cavitation device and a water ring vacuum pump, which can completely prevent cavitation of the water ring vacuum pump for a long time, thereby ensuring the safe and efficient operation of the water ring vacuum pump and the steam turbine generator set.
[0005] Specifically, this application provides an automatic anti-cavitation device for use in a water ring vacuum pump, the water ring vacuum pump including a main pipe and an exhaust pipe, the automatic anti-cavitation device including:
[0006] Gas connection pipe, used to connect to the atmosphere;
[0007] The air supply regulating valve has one end connected to the air inlet pipe and the other end connected to the main pipe.
[0008] A pressure sensor is installed on the main pipeline and located downstream of the gas supply regulating valve. The pressure sensor is used to detect the inlet pressure of the water ring vacuum pump.
[0009] A temperature sensor, installed on the exhaust pipe, is used to detect the temperature of the water ring liquid in the water ring vacuum pump; and
[0010] The controller is coupled to the gas supply regulating valve, the pressure sensor, and the temperature sensor respectively. The controller controls the gas supply regulating valve according to the inlet pressure of the water ring vacuum pump and the water ring liquid temperature of the water ring vacuum pump.
[0011] As a preferred option, the following also include:
[0012] A control cabinet is installed on the main pipeline; the gas inlet pipe, the gas supply regulating valve, and the pressure sensor are located inside the control cabinet, and the gas inlet pipe extends out of the control cabinet.
[0013] As a preferred option, the following also include:
[0014] A display screen is located on the surface of the control cabinet and is coupled to the pressure sensor and the temperature sensor respectively. The display screen is used to display the inlet pressure of the water ring vacuum pump, the water ring liquid temperature of the water ring vacuum pump, the atmospheric flow rate of the gas inlet pipe, and the opening degree of the gas supply regulating valve.
[0015] As a preferred embodiment, the air inlet end of the air inlet pipe is equipped with a silencer.
[0016] As a preferred option, the following also include:
[0017] The signal line is connected to the temperature sensor at one end and to the controller and the display screen at the other end.
[0018] As a preferred embodiment, the temperature sensor is a resistance temperature detector (RTD).
[0019] As a preferred embodiment, a flow meter is installed at the outlet of the air replenishment regulating valve.
[0020] As a preferred embodiment, the controller controls the gas replenishment regulating valve to increase its opening degree when the inlet pressure of the water ring vacuum pump is lower than the saturation pressure corresponding to the water ring liquid temperature of the water ring vacuum pump.
[0021] As a preferred embodiment, the controller controls the gas replenishment regulating valve to reduce its opening degree when the inlet pressure of the water ring vacuum pump is higher than the saturation pressure corresponding to the water ring liquid temperature of the water ring vacuum pump.
[0022] In addition, this application also provides a water ring vacuum pump, including a main pipe and an exhaust pipe, and further including the automatic anti-cavitation device as described above, wherein the gas supply regulating valve and the pressure sensor are disposed on the main pipe; and the temperature sensor is disposed on the exhaust pipe.
[0023] Compared with the prior art, this application has the following beneficial effects:
[0024] This application can calculate the required opening of the gas supply regulating valve by collecting pressure, temperature, and regulating valve opening information. By measuring the inlet pressure and exhaust pipe temperature of the water ring vacuum pump in real time, the opening is adjusted to ensure that the water ring vacuum pump is in optimal operating condition in real time, without cavitation and meeting the gas extraction requirements. This avoids problems such as cavitation recovery, non-condensation of the condenser, and insufficient gas volume to meet the condenser's operating requirements. Attached Figure Description
[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0026] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.
[0027] Figure 1 This is a schematic diagram of the overall structure of a water ring vacuum pump according to an embodiment of this application;
[0028] Figure 2 yes Figure 1 A magnified view of part AA. Detailed Implementation
[0029] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings.
[0030] In the description of this application, it should be understood that the orientations or positional relationships indicated by terms, etc., are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing this application and simplifying the description, and are not intended to indicate or imply that the device, element, module, system, platform, or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. The following description of this application is only to be understood as a description of individual embodiments of the technical solutions of this application. Other embodiments are not reflected in the following description, but this does not mean that this application excludes these other embodiments, nor is the technical solution of this application limited to the specific implementations described below, and the protection scope of this application is not limited to the specific implementations described below. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of this application.
[0031] It should be noted that if the terms "first," "second," etc., appear in the specification, claims, and accompanying drawings of this application, such descriptions are only used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a system, product, or device that comprises a series of units, modules, or components is not necessarily limited to those explicitly listed, but may include other components not explicitly listed or inherent to such systems, products, or devices.
[0032] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.
[0033] In some embodiments, such as Figure 1 and 2 As shown, this application provides a water ring vacuum pump 1, which includes a main pipe 11 and an exhaust pipe 12.
[0034] The water ring vacuum pump 1 is also equipped with an automatic anti-cavitation device 13, which includes: an air inlet pipe 131 for connecting to the atmosphere; a gas supply regulating valve 132, one end of which is connected to the air inlet pipe 131 and the other end of which is connected to the main pipe 11; a pressure sensor 133, which is located on the main pipe 11 and behind the gas supply regulating valve 132, and is used to detect the inlet pressure of the water ring vacuum pump; a temperature sensor 134, which is located on the exhaust pipe 12, and is used to detect the temperature of the water ring liquid in the water ring vacuum pump 1; and a controller (not shown), which is coupled to the gas supply regulating valve 132, the pressure sensor 133 and the temperature sensor 134 respectively, and the controller controls the gas supply regulating valve 132 according to the inlet pressure of the water ring vacuum pump and the temperature of the water ring liquid in the water ring vacuum pump 1.
[0035] In some embodiments, a control cabinet 136 and a display screen 135 are further included, which are coupled to the pressure sensor 133 and the temperature sensor 134, respectively. The display screen 135 is used to display the inlet pressure of the water ring vacuum pump, the water ring liquid temperature of the water ring vacuum pump, the atmospheric flow rate of the gas inlet pipe, and the opening degree of the gas replenishment regulating valve. The control cabinet 136 is disposed on the main pipe 11. The gas inlet pipe 131, the gas replenishment regulating valve 132, and the pressure sensor 133 are located inside the control cabinet 136, and the gas inlet pipe 131 extends out of the control cabinet 136. The display screen 135 is located on the surface of the control cabinet 136.
[0036] In some embodiments, the air inlet end of the air inlet pipe 131 is provided with a silencer head 137; one end of the signal line 138 is connected to the temperature sensor 134, and the other end is connected to the controller and the display screen 135 respectively; the temperature sensor 134 is a resistance temperature detector, preferably a PT100; a flow meter (not shown) is provided at the outlet of the air replenishment regulating valve 132.
[0037] This application can adjust in a timely manner according to changes in pumping volume and liquid ring temperature to avoid cavitation recovery. For example, by maintaining a certain opening, the supply gas volume can be changed at any time when the liquid ring temperature or vacuum increases, so that cavitation recovery will not occur at the impeller. For another example, when the liquid ring temperature or vacuum decreases, the opening can be closed or reduced to avoid the problem that the actual amount of non-condensable gas pumped by the water ring vacuum pump does not meet the operating requirements of the condenser.
[0038] Specifically, the controller monitors the exhaust pipe 12 of the water ring vacuum pump 1 through temperature sensor 134 and monitors the inlet pressure of the water ring vacuum pump through pressure sensor 133.
[0039] When the inlet pressure of the water ring vacuum pump decreases, if the controller calculates that the inlet pressure of the water ring vacuum pump is lower than the saturation pressure corresponding to the water ring liquid temperature of the water ring vacuum pump, it controls the gas supply regulating valve 132 to increase its opening. At this time, the inlet pressure of the water ring vacuum pump increases. During this process, the controller monitors and calculates in real time. If the controller calculates that the inlet pressure of the water ring vacuum pump has become a safe pressure that is slightly higher than the saturation pressure corresponding to the water ring liquid temperature of the water ring vacuum pump, the regulating valve will no longer increase its opening. At this time, the water ring vacuum pump 1 will not experience cavitation, and the actual pumping volume will meet the requirements.
[0040] When the inlet pressure of the water ring vacuum pump increases, if the controller calculates that the inlet pressure of the water ring vacuum pump is much higher than the saturation pressure corresponding to the water ring liquid temperature of the water ring vacuum pump, then the controller controls the gas supply regulating valve 132 to reduce its opening. At this time, the inlet pressure of the water ring vacuum pump decreases. During this process, the controller monitors and calculates in real time. If the controller calculates that the inlet pressure of the water ring vacuum pump has become a safe pressure that is slightly higher than the saturation pressure corresponding to the water ring liquid temperature of the water ring vacuum pump, then the regulating valve will no longer reduce its opening. At this time, the water ring vacuum pump 1 will not experience cavitation, and the actual pumping volume will meet the requirements.
[0041] When the temperature of the water ring liquid rises due to the increase in ambient temperature or the cooling water temperature of the water ring vacuum pump, if the controller calculates that the inlet pressure of the water ring vacuum pump is lower than the saturation pressure corresponding to the water ring liquid temperature, it controls the gas supply regulating valve 132 to increase its opening. At this time, the inlet pressure of the water ring vacuum pump increases. During this process, the controller monitors and calculates in real time. If the controller calculates that the inlet pressure of the water ring vacuum pump has become a safe pressure slightly higher than the saturation pressure corresponding to the water ring liquid temperature, the regulating valve will no longer increase its opening. At this time, the water ring vacuum pump 1 will not experience cavitation, and the actual pumping volume will meet the requirements.
[0042] When the temperature of the water ring liquid decreases due to a drop in ambient temperature or cooling water temperature of the water ring vacuum pump, if the controller calculates that the inlet pressure of the water ring vacuum pump is much higher than the saturation pressure corresponding to the water ring liquid temperature, it controls the gas supply regulating valve 132 to reduce its opening. At this time, the inlet pressure of the water ring vacuum pump decreases. During this process, the controller monitors and calculates in real time. If the controller calculates that the inlet pressure of the water ring vacuum pump has become a safe pressure slightly higher than the saturation pressure corresponding to the water ring liquid temperature, the regulating valve will no longer reduce its opening. At this time, the water ring vacuum pump 1 will not experience cavitation, and the actual pumping volume will meet the requirements.
[0043] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0044] The above-described embodiments are merely illustrative of several implementation methods of this application and are only used to illustrate the technical solutions of this utility model, not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model. For those skilled in the art, several modifications and improvements can be made without departing from the concept of this application, and these all fall within the protection scope of this application.
Claims
1. An automatic anti-cavitation device for use in a water ring vacuum pump, the water ring vacuum pump comprising a main pipe and an exhaust pipe, characterized in that, The automatic anti-cavitation device includes: Gas connection pipe, used to connect to the atmosphere; The air supply regulating valve has one end connected to the air inlet pipe and the other end connected to the main pipe. A pressure sensor is installed on the main pipeline and located downstream of the gas supply regulating valve. The pressure sensor is used to detect the inlet pressure of the water ring vacuum pump. A temperature sensor, installed on the exhaust pipe, is used to detect the temperature of the water ring liquid in the water ring vacuum pump; and The controller is coupled to the gas supply regulating valve, the pressure sensor, and the temperature sensor respectively. The controller controls the gas supply regulating valve according to the inlet pressure of the water ring vacuum pump and the water ring liquid temperature of the water ring vacuum pump.
2. The automatic anti-cavitation device according to claim 1, characterized in that, Also includes: A control cabinet is installed on the main pipeline; the gas inlet pipe, the gas supply regulating valve, and the pressure sensor are located inside the control cabinet, and the gas inlet pipe extends out of the control cabinet.
3. The automatic anti-cavitation device according to claim 2, characterized in that, Also includes: A display screen is located on the surface of the control cabinet and is coupled to the pressure sensor and the temperature sensor respectively. The display screen is used to display the inlet pressure of the water ring vacuum pump, the water ring liquid temperature of the water ring vacuum pump, the atmospheric flow rate of the gas inlet pipe, and the opening degree of the gas supply regulating valve.
4. The automatic anti-cavitation device according to claim 1, characterized in that: The air inlet end of the air inlet pipe is equipped with a silencer.
5. The automatic anti-cavitation device according to claim 3, characterized in that, Also includes: The signal line is connected to the temperature sensor at one end and to the controller and the display screen at the other end.
6. The automatic anti-cavitation device according to claim 1, characterized in that: The temperature sensor is a resistance temperature detector (RTD).
7. The automatic anti-cavitation device according to claim 1, characterized in that: A flow meter is installed at the outlet of the air replenishment regulating valve.
8. A water ring vacuum pump, comprising a main pipe and an exhaust pipe, characterized in that, It also includes an automatic anti-cavitation device as described in any one of claims 1-7, wherein the air supply regulating valve and the pressure sensor are disposed on the main pipeline; and the temperature sensor is disposed on the exhaust pipeline.