Mode-switchable water ring vacuum pump cooler

Abstract

The invention provides a mode-switchable water ring vacuum pump cooler, which relates to the technical field of vacuum pump equipment and comprises a pump body, a base is arranged at the bottom of the pump body, an air inlet of the pump body is communicated with a condenser, an air outlet of the pump body is communicated with a steam-water separator, and an exhaust port of the steam-water separator is provided with a first pipeline and a second pipeline. The first pipeline and the second pipeline are communicated with the cooler and the feed pump sealing water tank respectively, a water outlet of the cooler is communicated with the pump body through a liquid conveying pipe, electromagnetic valves are arranged in the first pipeline and the second pipeline respectively, an air inlet of the pump body is connected with the condenser, and an air outlet of the pump body is connected with the steam-water separator. An outlet of the steam-water separator is divided into a first pipeline and a second pipeline, the steam-water separator is communicated with the cooler through the first pipeline, the steam-water separator is communicated with the feed pump sealing water tank through the second pipeline, switching communication of the cooler or the feed pump sealing water tank is achieved through coordination of electromagnetic valve switches in the first pipeline and the second pipeline, and at the moment, the pump body can still operate normally.

Description

Technical Field

[0001] The invention relates to the technical field of vacuum pump equipment, and in particular to a water ring vacuum pump cooler with switchable modes. Background Art

[0002] During the operation of the water ring vacuum pump, the working fluid (deionized water) absorbs the heat of the non-condensable gas in the turbine exhaust and its temperature rises. Because the working pressure of the vacuum pump is the condenser vacuum and the saturation temperature is low, the working fluid is very easy to vaporize after the temperature rises. If it is not cooled in time, it will affect the vacuum pump output and then the condenser vacuum, affecting the economic operation of the unit. In severe cases, it will cause the vacuum pump water ring to be unable to maintain, destroying the condenser vacuum and endangering the safe operation of the unit. At the same time, the vaporization of the working fluid will also cause cavitation inside the vacuum pump water ring vacuum pump. Long-term operation will damage the structure of the water ring vacuum pump, which will also affect the normal operation of the unit.

[0003] At present, most power plants generally use water ring vacuum pumps with coolers. After the vacuum pump absorbs the non-condensable gas in the condenser, part of the working fluid is taken out into the steam-water separator during the exhaust process of the water ring vacuum pump. The separated working fluid is cooled down by the cooler and re-enters the water ring vacuum pump to form a circulation loop. This type of vacuum pump can reduce water replenishment and improve economy. However, due to the cooler being easy to get dirty and air accumulating, the cooling effect is poor. The vacuum pump in operation needs to regularly measure the end difference of the vacuum pump cooler. When the end difference is large, the cooler is isolated for cleaning. There may be a situation where the discovery is not timely, and the vacuum pump loses reliable standby during the isolation of the cooler. If the working fluid after the separation of steam and water in the vacuum pump is discharged directly, and the water ring is replenished by directly replenishing water, the water replenishment rate will increase significantly.

[0004] Therefore, in view of the above situation, there is an urgent need to develop a water ring vacuum pump cooler with switchable modes to overcome the shortcomings in current practical applications. Summary of the invention

[0005] The invention provides a water ring vacuum pump cooler with switchable modes, so as to solve the defects in the prior art.

[0006] The present invention provides a water ring vacuum pump cooler with switchable modes, comprising: a pump body, a base is arranged at the bottom of the pump body, an air inlet of the pump body is connected to a condenser, an air outlet of the pump body is connected to a steam-water separator, an exhaust port of the steam-water separator is provided with a first pipeline and a second pipeline, the first pipeline and the second pipeline are respectively connected to the cooler and a sealing water tank of a water supply pump, a drain port of the cooler is connected to the pump body through an infusion pipe, and solenoid valves are respectively arranged in the first pipeline and the second pipeline.

[0007] Preferably, the pump body includes a pump casing, a partition plate is vertically arranged in the pump casing, the partition plate divides the pump casing into a vacuum chamber and a driving chamber, an air inlet pipe, an exhaust pipe and a water supply valve are arranged on the top of the pump casing, the air inlet pipe and the exhaust pipe are respectively connected to the vacuum chamber, a driving motor is arranged in the driving chamber, the driving end of the driving motor is transmission-connected with a rotating shaft, the rotating shaft is rotatably arranged in the vacuum chamber between the center of the partition plate and one side inner wall of the pump casing, a sealed bearing is arranged between the rotating shaft and the partition plate and one side inner wall of the pump casing, and an impeller is arranged on the rotating shaft.

[0008] Preferably, the outer cover of the pump body is provided with a first heat exchange shell, a first heat exchange cavity is defined between the first heat exchange shell and the pump shell, the side of the rotating shaft away from the drive motor extends out of the pump shell and is fixedly provided with a heat-conducting column, the rotating shaft and the heat-conducting column are coaxially arranged, the outer cover of the heat-conducting column is provided with a second heat exchange shell, a second heat exchange cavity is defined between the second heat exchange shell and the pump shell, the second heat exchange cavity is communicated with the first heat exchange cavity, a filter ring is provided between the second heat exchange cavity and the first heat exchange cavity, a liquid inlet pipe and a liquid discharge pipe are provided on the first heat exchange cavity, and a filter screen is provided in the liquid inlet pipe.

[0009] Preferably, the rotating shaft and the heat-conducting column are made of heat-conducting material.

[0010] Preferably, one-way valves are provided in the air intake pipe and the exhaust pipe.

[0011] Preferably, it also includes:

[0012] A rotation speed detection module is used to measure the rotation speed of the impeller;

[0013] Pressure detection module, used to measure the working pressure inside the pump casing;

[0014] Temperature detection module, used to measure the working temperature of the impeller;

[0015] A calculation module 1, used for calculating the actual life coefficient of the impeller based on the rotation speed of the impeller;

[0016] An alarm module, used for issuing an alarm;

[0017] A processing module, used for comparing the actual life coefficient of the impeller obtained by the calculation module 1 with the rated life coefficient of the impeller;

[0018] Control module, when the actual life coefficient of the impeller is less than the rated life coefficient of the impeller, the control alarm module will sound an alarm and control the pump body to stop working. When the actual life coefficient of the impeller is greater than or equal to the rated life coefficient of the impeller, the pump body will work normally.

[0019] Preferably, the calculation module 1 calculates based on the following formula 1:

[0020]

[0021] S is the actual life coefficient of the impeller, N is the number rate of particles, M is the mass of the impeller, c1 is the material constant of the impeller, c2 is a dimensionless value, V is the rotation speed of the impeller, cos is the cosine function, sin is the sine function, R is the gas constant, ∈1 is the angle between the blades on the impeller and the rotation axis, ∈2 is the angle between the intake direction of the intake pipe and the impeller, π is the pi, A is the contact area between the impeller surface and the outside world, t is the working cycle of the impeller, P is the working pressure in the pump casing, T is the working temperature of the impeller, and r is the diameter of the blades in the impeller.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] By coordinating the solenoid valve switches set in the first pipeline and the second pipeline, the switching connection between the steam-water separator and the cooler or the sealed water tank of the water pump is realized. When working, the pump body exhausts air to the steam-water separator, and the steam-water separator separates the gas. The separated working fluid goes through the cooler for cooling in normal mode and then returns to the pump body for circulation through the infusion tube, which can reduce water replenishment and improve economy. When the temperature of the working fluid after being treated by the cooler is greater than or equal to the exhaust temperature of the condenser, the solenoid valve in the first pipeline is automatically closed, and the solenoid valve in the second pipeline is automatically opened and switched to the second pipeline for use. The working fluid separated by the steam-water separator is transported to the sealed water tank of the water pump through the second pipeline for storage. The external water source directly replenishes the pump body through the water replenishment valve on the pump body. At the same time, the alarm module sounds an alarm. At this time, the pump body can still operate normally. After the cooler is processed, the solenoid valve in the first pipeline is reopened, and the water replenishment valve and the solenoid valve in the second pipeline are closed. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure provided by an embodiment of the present invention;

[0026] Figure 2 It is a schematic diagram of the cross-sectional structure of a pump body provided by an embodiment of the present invention.

[0027] Reference numerals:

[0028] 1. Pump body; 11. Base; 12. Pump casing; 121. Partition plate; 122. Vacuum chamber; 1221. Inlet pipe; 1222. Exhaust pipe; 1223. Water supply valve; 123. Drive chamber; 124. Drive motor; 125. Rotating shaft; 126. Sealed bearing; 127. Impeller; 128. Heat-conducting column; 13. First heat exchange shell; 131. First heat exchange chamber; 14. Second heat exchange shell; 141. Second heat exchange chamber; 142. Liquid inlet pipe; 143. Liquid discharge pipe; 144. Filter screen; 15. Filter ring; 16. One-way valve; 2. Condenser; 3. Steam-water separator; 31. First pipeline; 32. Second pipeline; 4. Sealed water tank of feed pump; 5. Cooler; 51. Liquid infusion pipe. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] In addition, in the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes, and do not specifically refer to the order or sequence, nor are they used to limit the present invention. They are only used to distinguish components or operations described with the same technical terms, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions and technical features between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0031] The present invention provides the following embodiments

[0032] Example 1

[0033] The embodiment of the present invention provides a water ring vacuum pump cooler with switchable modes, such as Figure 1-Figure 2As shown, it includes: a pump body 1, a base 11 is arranged at the bottom of the pump body 1, the air inlet of the pump body 1 is connected to the condenser 2, the air outlet of the pump body 1 is connected to the steam-water separator 3, the exhaust port of the steam-water separator 3 is provided with a first pipeline 31 and a second pipeline 32, the first pipeline 31 and the second pipeline 32 are respectively connected to the cooler 5 and the water supply pump sealing water tank 4, the drain port of the cooler 5 is connected to the pump body 1 through the infusion pipe 51, and the first pipeline 31 and the second pipeline 32 are respectively provided with solenoid valves.

[0034] The working principle and beneficial effects of the above technical solution are as follows: the air inlet of the pump body 1 is connected to the condenser 2, the air outlet of the pump body 1 is connected to the steam-water separator 3, the outlet of the steam-water separator 3 is divided into a first pipeline 31 and a second pipeline 32, the first pipeline 31 is connected to the cooler 5, and the second pipeline 32 is connected to the sealed water tank 4 of the water supply pump. The switching connection between the steam-water separator 3 and the cooler 5 or the sealed water tank 4 of the water supply pump is realized by coordinating the switches of the solenoid valves arranged in the first pipeline 31 and the second pipeline 32. When working, the pump body 1 exhausts air to the steam-water separator 3, and the steam-water separator 3 separates the gas. The separated working fluid goes through the cooler 5 for cooling in the normal mode and then returns to the pump body 1 for circulation through the infusion pipe 51. It can reduce water replenishment and improve economy. When the temperature of the working fluid after being treated by the cooler 5 is greater than or equal to the exhaust temperature of the condenser 2, the solenoid valve in the first pipeline 31 is automatically closed, and at the same time, the solenoid valve in the second pipeline 32 is automatically opened and switched to the second pipeline 32 for use. The working fluid separated by the steam-water separator 3 is transported to the water supply pump sealing water tank 4 through the second pipeline 32 for storage. The external water source directly replenishes water for the pump body 1 through the water replenishment valve 1223 on the pump body 1. At the same time, the alarm module sounds an alarm. At this time, the pump body 1 can still operate normally. After the cooler 5 is processed, the solenoid valve in the first pipeline 31 is reopened, and the water replenishment valve 1223 and the solenoid valve in the second pipeline 32 are closed to continue the circulation.

[0035] Example 2

[0036] On the basis of Example 1, Figure 1-Figure 2As shown, the pump body 1 includes a pump housing 12, a partition plate 121 is vertically arranged in the pump housing 12, the partition plate 121 divides the pump housing 12 into a vacuum chamber 122 and a driving chamber 123, an air inlet pipe 1221, an exhaust pipe 1222, and a water replenishing valve 1223 are arranged on the top of the pump housing 12, the air inlet pipe 1221 and the exhaust pipe 1222 are respectively communicated with the vacuum chamber 122, a driving motor 124 is arranged in the driving chamber 123, a driving end of the driving motor 124 is transmission-connected with a rotating shaft 125, the rotating shaft 125 is rotatably arranged in the vacuum chamber 122 between the center of the partition plate 121 and the inner wall of one side of the pump housing 12, a sealed bearing 126 is arranged between the rotating shaft 125 and the partition plate 121 and the inner wall of one side of the pump housing 12, and an impeller 127 is arranged on the rotating shaft 125;

[0037] One-way valves 16 are provided in the air inlet pipe 1221 and the air outlet pipe 1222 .

[0038] The working principle and beneficial effects of the above technical solution are as follows: the inner wall of the pump housing 12 fixes and supports the partition plate 121, the driving chamber 123 supports and fixes the driving motor 124, and the outer surface of the pump housing 12 supports the air inlet pipe 1221, the exhaust pipe 1222, and the water supply valve 1223. When the solenoid valve in the first pipeline 31 is closed and the solenoid valve in the second pipeline 32 is opened, the external water source directly supplies water to the pump body 1 through the water supply valve 1223 on the pump body 1. When the solenoid valve in the first pipeline 31 is opened and the solenoid valve in the second pipeline 32 is closed, the cooler 5 inputs the liquid into the pump body 1 through the infusion tube 51 for circulation. The driving end of the driving motor 124 drives the rotating shaft 125 to rotate between the partition plate 121 and the inner wall of the pump housing 12 through the coupling. 125 drives the impeller 127 to rotate in the vacuum chamber 122. When the impeller 127 rotates, the gas put into the intake pipe 1221 is guided and processed. The processed gas is discharged from the exhaust pipe 1222 under the gravitational force generated by the rotation of the impeller 127. The discharged gas enters the steam-water separator 3 for processing. The sealing bearing 126 assists the rotation of the rotating shaft 125 while sealing and isolating the vacuum chamber 122, the driving chamber 123 and the outside of the pump housing 12 to prevent the gas and air pressure in the vacuum chamber 122 from leaking. The one-way valve 16 arranged in the intake pipe 1221 and the exhaust pipe 1222 prevents the gas in the vacuum chamber 122 from leaking from the intake pipe 1221 and the gas outside the exhaust pipe 1222 from entering the vacuum chamber 122, causing unstable air pressure in the vacuum chamber 122.

[0039] Example 3

[0040] On the basis of Example 2, Figure 1-Figure 2As shown, the outer cover of the pump body 1 is provided with a first heat exchange shell 13, a first heat exchange cavity 131 is opened between the first heat exchange shell 13 and the pump shell 12, the side of the rotating shaft 125 away from the driving motor 124 extends out of the pump shell 12 and is fixedly provided with a heat-conducting column 128, the rotating shaft 125 and the heat-conducting column 128 are coaxially arranged, the outer cover of the heat-conducting column 128 is provided with a second heat exchange shell 14, a second heat exchange cavity 141 is opened between the second heat exchange shell 14 and the pump shell 12, the second heat exchange cavity 141 is communicated with the first heat exchange cavity 131, a filter ring 15 is arranged between the second heat exchange cavity 141 and the first heat exchange cavity 131, a liquid inlet pipe 142 and a liquid discharge pipe 143 are arranged on the first heat exchange cavity 131, and a filter screen 144 is arranged in the liquid inlet pipe 142;

[0041] The rotating shaft 125 and the heat-conducting column 128 are made of heat-conducting material.

[0042] The working principle and beneficial effects of the above technical solution are as follows: the pump housing 12 supports the first heat exchange housing 13 and the second heat exchange housing 14; the first heat exchange housing 13 supports the liquid inlet pipe 142 and the liquid discharge pipe 143; the rotating shaft 125 supports the heat-conducting column 128; the rotating shaft 125 and the heat-conducting column 128 are made of heat-conducting material; the rotating shaft 125 drives the heat-conducting column 128 to rotate synchronously and coaxially; the setting of the heat-conducting column 128 does not affect the rotation of the rotating shaft 125; since the rotating shaft 125 and the heat-conducting column 128 are made of heat-conducting material, the heat generated in the vacuum chamber 122 is discharged into the second heat exchange chamber 141 along the rotating shaft 125 and the heat-conducting column 128 while ensuring the normal rotation of the impeller 127; the coolant is put into the first heat exchange chamber 131 and the second heat exchange chamber 141 from the liquid inlet pipe 142 and discharged from the liquid discharge pipe 143 is discharged, and the filter ring 15 plays a supporting role between the pump housing 12 and the second heat exchange housing 14. The filter ring 15 prevents impurities from flowing into the second heat exchange chamber 141 and contacting the heat-conducting column 128 while connecting the first heat exchange chamber 131 and the second heat exchange chamber 141, thereby slowing down the corrosion rate of the outer surface of the heat-conducting column 128. The liquid inlet pipe 142 contacts the outer surface of the pump housing 12, and the heat generated in the pump housing 12 is absorbed by the coolant through the pump housing 12. The heat-conducting column 128 further conducts the heat generated in the vacuum chamber 122. The diameter of the heat-conducting column 128 is larger than the rotating shaft 125, which increases the contact area with the coolant and the heat dissipation area. The coolant after absorbing the heat is discharged from the drain pipe 143 and collected for utilization. The heat generated is collected while the pump body 1 is cooled, thereby saving resources.

[0043] Example 4

[0044] On the basis of Example 3, the invention further includes:

[0045] A rotation speed detection module, used to measure the rotation speed of the impeller 127;

[0046] A pressure detection module, used to measure the working pressure in the pump housing 12;

[0047] A temperature detection module, used to measure the operating temperature of the impeller 127;

[0048] A calculation module 1, for calculating an actual life coefficient of the impeller 127 based on the rotation speed of the impeller 127;

[0049] An alarm module, used for issuing an alarm;

[0050] A processing module, used for comparing the actual life coefficient of the impeller 127 obtained by the calculation module 1 with the rated life coefficient of the impeller 127;

[0051] The control module controls the alarm module to sound an alarm when the actual life coefficient of the impeller 127 is less than the rated life coefficient of the impeller 127 and controls the pump body 1 to stop working. When the actual life coefficient of the impeller 127 is greater than or equal to the rated life coefficient of the impeller 127, the pump body 1 works normally.

[0052] The working principle and beneficial effects of the above technical solution are as follows: the speed detection module measures the rotation speed of the impeller 127, the pressure detection module measures the working pressure in the pump casing 12, the temperature detection module measures the working temperature of the impeller 127, the calculation module 1 calculates the actual life coefficient of the impeller 127 based on the rotation speed of the impeller 127, the alarm module is used to issue an alarm, and the processing module compares the actual life coefficient of the impeller 127 obtained by the calculation module 1 with the rated life coefficient of the impeller 127. When the actual life coefficient of the impeller 127 is less than the rated life coefficient of the impeller 127, the control module controls the alarm module to issue an alarm and at the same time controls the pump body 1 to stop working. When the actual life coefficient of the impeller 127 is greater than or equal to the rated life coefficient of the impeller 127, the pump body 1 works normally.

[0053] Example 5

[0054] Based on Example 4, the calculation module 1 calculates based on the following formula 1:

[0055]

[0056] S is the actual life coefficient of the impeller 127, N is the number rate of particles, M is the mass of the impeller 127, c1 is the material constant of the impeller 127, c2 is a dimensionless value, V is the rotation speed of the impeller 127, cos is the cosine function, sin is the sine function, R is the gas constant, ∈1 is the angle between the blades on the impeller 127 and the rotating shaft 125, ∈2 is the angle between the intake direction of the intake pipe 1221 and the impeller 127, π is the pi, A is the contact area between the surface of the impeller 127 and the outside world, t is the working cycle of the impeller 127, P is the working pressure in the pump casing 12, T is the working temperature of the impeller 127, and r is the diameter of the blades in the impeller 127.

[0057] The working principle and beneficial effects of the above technical solution are as follows: the number rate of particles refers to the number of particles passing through The actual life coefficient of the impeller 127 is calculated. When the actual life coefficient of the impeller 127 is less than the rated life coefficient of the impeller 127, the control module controls the alarm module to sound an alarm and controls the pump body 1 to stop working. When the actual life coefficient of the impeller 127 is greater than or equal to the rated life coefficient of the impeller 127, the pump body 1 works normally.

[0058] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. 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. A water ring vacuum pump cooler with switchable modes, characterized in that: A pump body (1), wherein a base (11) is provided at the bottom of the pump body (1), an air inlet of the pump body (1) is connected to a condenser (2), an air outlet of the pump body (1) is connected to a steam-water separator (3), an exhaust port of the steam-water separator (3) is provided with a first pipeline (31) and a second pipeline (32), the first pipeline (31) and the second pipeline (32) are respectively connected to a cooler (5) and a sealed water tank (4) of a water supply pump, the drain port of the cooler (5) is connected to the pump body (1) via a liquid infusion pipe (51), and electromagnetic valves are respectively provided in the first pipeline (31) and the second pipeline (32).

2. A water ring vacuum pump cooler with switchable modes according to claim 1, characterized in that: The pump body (1) comprises a pump housing (12), a partition plate (121) is vertically arranged in the pump housing (12), and the partition plate (121) divides the pump housing (12) into a vacuum chamber (122) and a drive chamber (123); an air intake pipe (1221), an air exhaust pipe (1222), and a water supply valve (1223) are arranged on the top of the pump housing (12), and the air intake pipe (1221) and the air exhaust pipe (1222) are respectively connected to the vacuum chamber (122), and the drive chamber (123) is connected to the drive chamber (123). A driving motor (124) is arranged inside, and a driving end of the driving motor (124) is drivingly connected to a rotating shaft (125). The rotating shaft (125) is rotatably arranged in the vacuum chamber (122) between the center of the partition plate (121) and the inner wall of one side of the pump housing (12). A sealed bearing (126) is arranged between the rotating shaft (125) and the partition plate (121) and the inner wall of one side of the pump housing (12). An impeller (127) is arranged on the rotating shaft (125).

3. A water ring vacuum pump cooler with switchable modes according to claim 2, characterized in that: The pump body (1) comprises a pump housing (12), a partition plate (121) is vertically arranged in the pump housing (12), and the partition plate (121) divides the pump housing (12) into a vacuum chamber (122) and a drive chamber (123); an air intake pipe (1221), an air exhaust pipe (1222), and a water supply valve (1223) are arranged on the top of the pump housing (12), and the air intake pipe (1221) and the air exhaust pipe (1222) are respectively connected to the vacuum chamber (122), and the drive chamber (123) is connected to the drive chamber (123). A driving motor (124) is arranged inside, and a driving end of the driving motor (124) is drivingly connected to a rotating shaft (125). The rotating shaft (125) is rotatably arranged in the vacuum chamber (122) between the center of the partition plate (121) and the inner wall of one side of the pump housing (12). A sealed bearing (126) is arranged between the rotating shaft (125) and the partition plate (121) and the inner wall of one side of the pump housing (12). An impeller (127) is arranged on the rotating shaft (125).

4. The water ring vacuum pump cooler with switchable modes according to claim 3, characterized in that: The rotating shaft (125) and the heat-conducting column (128) are made of heat-conducting material.

5. The water ring vacuum pump cooler with switchable modes according to claim 4, characterized in that: One-way valves (16) are provided in the air inlet pipe (1221) and the air outlet pipe (1222).

6. The water ring vacuum pump cooler with switchable modes according to claim 5, characterized in that: Also includes: A rotation speed detection module, used to measure the rotation speed of the impeller (127); A pressure detection module, used for measuring the working pressure in the pump casing (12); A temperature detection module, used to measure the operating temperature of the impeller (127); A calculation module 1, used for calculating an actual life coefficient of the impeller (127) based on the rotation speed of the impeller (127); An alarm module, used for issuing an alarm; A processing module, used for comparing the actual life coefficient of the impeller (127) obtained by the calculation module 1 with the rated life coefficient of the impeller (127); The control module controls the alarm module to sound an alarm when the actual life coefficient of the impeller (127) is less than the rated life coefficient of the impeller (127), and controls the pump body (1) to stop working at the same time; when the actual life coefficient of the impeller (127) is greater than or equal to the rated life coefficient of the impeller (127), the pump body (1) works normally.

7. The water ring vacuum pump cooler with switchable modes according to claim 6, characterized in that: The calculation module 1 calculates based on the following formula 1: S is the actual life coefficient of the impeller (127), N is the number rate of particles, M is the mass of the impeller (127), c1 is the material constant of the impeller (127), c2 is a dimensionless value, V is the rotation speed of the impeller (127), cos is the cosine function, sin is the sine function, R is the gas constant, ∈1 is the angle between the blades on the impeller (127) and the rotation axis (125), ∈2 is the angle between the intake direction of the intake pipe (1221) and the impeller (127), π is the circumference, A is the contact area between the surface of the impeller (127) and the outside world, t is the working cycle of the impeller (127), P is the working pressure in the pump casing (12), T is the working temperature of the impeller (127), and r is the diameter of the blades in the impeller (127).

Images