Vacuum-pumping system of sterilizer

Abstract

The utility model discloses a sterilizer vacuumizing system which comprises a sterilizer body, a heat exchanger, a liquid ring vacuum pump and a first water tank, the liquid ring vacuum pump is provided with a pump air suction port, a pump air exhaust port, a working liquid inlet and a working liquid outlet communicated with the pump air exhaust port, and the side wall of the first water tank is provided with a pump connector, a cooling water inlet and a cooling water outlet. The air exhaust pipeline is sequentially connected with the sterilizer body, the hot end of the heat exchanger, the pump air suction port, the pump air exhaust port and the pump interface; the liquid supply source is connected with the first pipeline which is sequentially connected with the first valve, the cold end of the heat exchanger and the cooling water inlet; the liquid feeding pipeline is connected with the cooling water outlet and the working liquid inlet; a temperature probe of the first temperature sensor extends into the bottom of the inner cavity of the first water tank; and the controller is electrically connected with the first temperature sensor and the first valve. The vacuum-pumping system for the sterilizer can reduce the water consumption on the premise of ensuring that the vacuum-pumping operation of the sterilizer is completed.

Description

Technical Field

[0001] The utility model relates to the technical field of vacuum sterilizers, and more specifically, to a vacuum pumping system for a sterilizer. Background Art

[0002] During the sterilization process, the sterilizer uses a vacuum pump to extract the internal air and steam (i.e., high-temperature and high-pressure water vapor) to form a certain degree of vacuum, so as to better control the pressure and temperature inside the sterilizer, and thus effectively carry out sterilization.

[0003] Currently, most sterilizers use liquid ring vacuum pumps for vacuum pumping. The liquid ring vacuum pump uses liquid as the working medium, and forms a sealed liquid ring under the action of rotational centrifugal force to achieve the process of vacuum extraction. As is well known, if the working liquid temperature of the liquid ring vacuum pump is too high, it will lead to a decrease in vacuum degree and increased internal wear of the pump body, reducing the vacuum pumping efficiency of the liquid ring vacuum pump, and even causing the sterilizer to reach a vacuum state. Therefore, during the vacuum pumping operation of the sterilizer by the liquid ring vacuum pump, the liquid ring vacuum pump will consume a large amount of liquid with a certain cooling capacity, such as cooling water, and the water consumption is large.

[0004] In summary, how to solve the problem of large water consumption of the current liquid ring vacuum pump for vacuum pumping of sterilizers is an urgent problem to be solved by those skilled in the art at present. Content of the Utility Model

[0005] In view of this, the purpose of the utility model is to provide a vacuum pumping system for a sterilizer, which can reduce the water consumption on the premise of ensuring the completion of the vacuum pumping operation of the sterilizer.

[0006] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0007] A vacuum pumping system for a sterilizer includes a sterilizer body, a heat exchanger, a liquid ring vacuum pump and a first water tank. The liquid ring vacuum pump is provided with a pump suction port, a pump exhaust port, a working liquid inlet and a working liquid outlet communicated with the pump exhaust port. The side wall of the first water tank is provided with a pump interface, a cooling water inlet and a cooling water outlet, and further includes:

[0008] A suction pipeline, which is sequentially connected to the sterilizer body, the hot end of the heat exchanger, the pump suction port, the pump exhaust port and the pump interface;

[0009] A liquid supply source, which is connected to a first pipeline, and the first pipeline is sequentially connected to a first valve, the cold end of the heat exchanger and the cooling water inlet;

[0010] A liquid delivery pipeline, which connects the cooling water outlet and the working liquid inlet;

[0011] A first temperature sensor, whose temperature probe extends into the inner cavity bottom of the first water tank, is used to monitor the temperature of the cooling water in the first water tank in real time;

[0012] A controller, electrically connected to the first temperature sensor and the first valve, is used to obtain the cooling water temperature data and control the opening and closing of the first valve.

[0013] Preferably, the liquid supply source is also connected to a second pipeline, the second pipeline is connected to the liquid delivery pipeline, and a second valve electrically connected to the controller is provided on the second pipeline.

[0014] Preferably, a box body exhaust port is provided on the top wall of the first water tank.

[0015] Preferably, a cavitation inlet is also provided on the side wall of the first water tank, and the cavitation inlet is connected to the cavitation protection interface of the liquid ring vacuum pump through a cavitation pipeline.

[0016] Preferably, it further includes a second water tank integrated with the first water tank and located below the first water tank. The second water tank is communicated with the first water tank through an overflow pipe, and a drain port is provided on the side wall of the second water tank.

[0017] Preferably, it further includes a second temperature sensor electrically connected to the controller. The temperature probe of the second temperature sensor extends into the inner cavity of the second water tank to monitor the temperature of the cooling water in the second water tank in real time.

[0018] Preferably, an inner chamber water interface is also provided on the side wall of the second water tank, and the inner cavity bottom of the sterilizer body is connected to the inner chamber water interface through a first drain pipeline;

[0019] An interlayer water interface is also provided on the side wall of the second water tank, and the inner cavity bottom of the sterilizer jacket sleeved on the outer periphery of the sterilizer body is connected to the interlayer water interface through a second drain pipeline.

[0020] Preferably, the overflow pipe is arranged lower than the pump interface and the cavitation inlet.

[0021] Preferably, the overflow pipe is located between the inner cavities of the first water tank and the second water tank, and a static water level overflow port is provided on the pipe section of the overflow pipe located in the inner cavity of the first water tank.

[0022] Preferably, the static water level overflow port is not lower than the working liquid inlet.

[0023] When the vacuum pumping system of the sterilizer provided by the utility model performs the vacuum pumping operation on the sterilizer, first control the first valve to open. The cooling water in the liquid supply source flows through the cold end of the heat exchanger and the cooling water inlet of the first water tank in sequence through the first pipeline. After a certain amount of cooling water is pre-stored in the first water tank, control the second valve to close. The cooling water in the first water tank flows into the working fluid inlet of the liquid ring vacuum pump through the liquid supply pipeline, and the liquid ring vacuum pump starts to work. The air and water vapor (i.e., high-temperature water vapor) in the sterilizer body first flow into the hot end of the heat exchanger through the air extraction pipeline for heat dissipation, and then the low-temperature water vapor flows into the first water tank through the suction and exhaust ports and the cooling water inlet of the liquid ring vacuum pump in sequence to realize the vacuum pumping operation on the sterilizer. In addition, after the cooling water flows into the liquid ring vacuum pump, since the working fluid outlet is communicated with the pump exhaust port, the cooling water can flow back into the first water tank from the pump exhaust port through the air extraction pipeline, that is, a cooling water circulation is formed, greatly reducing the water consumption.

[0024] During this process, the first temperature sensor monitors the temperature of the cooling water in the first water tank in real time and transmits it to the controller. If the temperature of the cooling water in the first water tank exceeds the set threshold, it means that the working fluid temperature of the liquid ring vacuum pump is higher than the appropriate temperature at this time, and the performance of the liquid ring vacuum pump is not good, affecting the vacuum pumping operation. Then control the first valve to open, and the water supply source replenishes the cooling water volume into the first water tank through the first pipeline to reduce the temperature of the cooling water in the first water tank, that is, to reduce the working fluid temperature of the liquid ring vacuum pump and ensure the normal progress of the vacuum pumping operation of the liquid ring vacuum pump. If the temperature of the cooling water in the first water tank is lower than the set threshold, it means that the working fluid temperature of the liquid ring vacuum pump is lower than the appropriate temperature at this time, and the performance of the liquid ring vacuum pump is normal, then control the first valve to close. This temperature control method ensures that the temperature of the cooling water in the first water tank meets the appropriate working fluid temperature of the liquid ring vacuum pump, enables the liquid ring vacuum pump to work normally, and ensures the completion of the vacuum pumping operation of the sterilizer.

[0025] Therefore, this application can greatly reduce the water consumption on the premise of ensuring the completion of the vacuum pumping operation of the sterilizer. Description of the Drawings

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0027] Figure 1 It is a schematic structural diagram of a vacuum pumping system for a sterilizer provided by the present utility model;

[0028] Figure 2 It is a schematic structural diagram of a box body composed of a first water tank and a second water tank provided by the present utility model.

[0029] Reference numerals:

[0030] 1 - Sterilizer body; 2 - Sterilizer jacket; 3 - Heat exchanger; 4 - Liquid ring vacuum pump; 5 - First water tank; 6 - Second water tank; 7 - Water supply source; 8 - First valve; 9 - Second valve; 10 - Overflow pipe; 11 - First drain valve; 12 - Second drain valve; 13 - First liquid discharge valve; 14 - Second liquid discharge valve;

[0031] 31 - Hot end; 32 - Cold end;

[0032] 41 - Pump suction port; 42 - Pump exhaust port; 43 - Working fluid inlet; 44 - Cavitation protection interface;

[0033] 51 - Pump interface; 52 - Cooling water inlet; 53 - Cooling water outlet; 54 - Box exhaust port; 55 - Cavitation inlet; 56 - First temperature sensor; 57 - First discharge port;

[0034] 61 - Drain port; 62 - Inner chamber water interface; 63 - Interlayer water interface; 64 - Second temperature sensor; 65 - Second discharge port;

[0035] 101 - Static water level overflow port;

[0036] I - Suction pipeline; II - Liquid supply pipeline; III - First pipeline; IV - Second pipeline; V - First liquid discharge pipeline; VI - Second liquid discharge pipeline; VII - First drain pipeline; VIII - Second drain pipeline. Detailed implementation manners

[0037] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0038] The core of the present utility model is to provide a sterilizer vacuum pumping system, which can reduce the water consumption on the premise of ensuring the completion of the sterilizer vacuum pumping operation.

[0039] It should be noted that in this embodiment, the orientation or positional relationship indicated by "upper", "lower", "front", "rear", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0040] Please refer to Figure 1 and Figure 2 , this application provides a vacuum pumping system for a sterilizer, which includes a sterilizer body 1, a heat exchanger 3, a liquid ring vacuum pump 4, and a first water tank 5. The liquid ring vacuum pump 4 is provided with a pump suction port 41, a pump exhaust port 42, a working liquid inlet 43, and a working liquid outlet communicated with the pump exhaust port 42. A pump interface 51, a cooling water inlet 52, and a cooling water outlet 53 are provided on the side wall of the first water tank 5. It also includes a suction pipeline I, a liquid supply source, a liquid delivery pipeline II, a first temperature sensor 56, and a controller.

[0041] Among them, the suction pipeline I is sequentially connected to the sterilizer body 1, the hot end 31 of the heat exchanger 3, the pump suction port 41, the pump exhaust port 42, and the pump interface 51; the water outlet of the liquid supply source is connected to the first pipeline III, and the first pipeline III is sequentially connected to the first valve 8, the cold end 32 of the heat exchanger 3, and the cooling water inlet 52; the liquid delivery pipeline II is connected to the cooling water outlet 53 and the working liquid inlet 43; the temperature probe of the first temperature sensor 56 extends into the inner cavity bottom of the first water tank 5 to monitor the cooling water temperature in the first water tank 5 in real time; the controller is electrically connected to the first temperature sensor 56 and the first valve 8 to obtain the cooling water temperature data and control the opening and closing of the first valve 8.

[0042] It should be noted that the purpose of vacuum pumping of the sterilizer is to remove air and water vapor (i.e., water vapor substances) in the packaging, so that after the sterilization chamber reaches a certain vacuum degree, saturated steam is filled, and finally the set pressure and temperature are reached, so as to realize the sterilization treatment of items.

[0043] The liquid ring vacuum pump 4 generally includes a pump body, an impeller, and a liquid ring. The impeller and the liquid ring are located inside the pump body, and the pump body is also provided with a pump suction port 41, a pump exhaust port 42, a working liquid inlet 43, and a working liquid outlet. Among them, when the impeller rotates, due to the action of centrifugal force, the working liquid such as cooling water will be forced to move outward to form a liquid ring. The liquid ring fills a part of the pump cavity. The vacuum degree in the pump cavity is low, and the gas will enter the pump cavity through the pump suction port 41 into the liquid ring. The pressure of the liquid ring gradually increases, and the gas will gradually be discharged through the pump exhaust port 42 to complete the pumping of gas. It should be noted that this application uses a liquid ring vacuum pump 4 with the pump exhaust port 42 communicated with the working liquid outlet, so that both the working liquid and the gas can be discharged from the pump body through the pump exhaust port 42. The specific structure of the liquid ring vacuum pump 4 can refer to the prior art and will not be elaborated here.

[0044] The heat exchanger 3 completes the heat transfer process through the interaction of two fluids, generally divided into two sides: a hot end 31 and a cold end 32. Among them, the hot end 31 is the side where the working fluid releases heat, and the cold end 32 is the side where the working fluid absorbs heat. The heat exchanger 3 can adopt a plate heat exchanger 3, and the specific structure can refer to the prior art and will not be elaborated here.

[0045] The specific setting method of the vacuum pumping system of the above sterilizer is as follows. The inner cavity of the sterilizer body 1, the inlet of the hot end 31 of the heat exchanger 3, the outlet of the hot end 31 of the heat exchanger 3, the suction port of the liquid ring vacuum pump 4, the exhaust port of the liquid ring vacuum pump 4, and the pump interface 51 of the first water tank 5 are connected through the vacuum pumping pipeline I. Under the suction action of the liquid ring vacuum pump 4, the vacuum pumping pipeline I transports the high-temperature water vapor in the inner cavity of the sterilizer body 1 to the first water tank 5 after cooling through the hot end 31 of the heat exchanger 3. The water supply source 7 adopts a cooling water supply device, generally composed of a cold water tank and a liquid supply pump placed at its water outlet end. The liquid supply pump, the first valve 8, the inlet of the cold end 32 of the heat exchanger 3, the outlet of the cold end 32 of the heat exchanger 3, and the cooling water inlet 52 are connected through the first pipeline III. Under the pumping power of the liquid supply pump, the first pipeline III transports the cooling water to the first water tank 5 through the cold end 32 of the heat exchanger 3 to replenish the cooling water volume in the first water tank 5. The cooling water outlet 53 of the first water tank 5 is connected to the working fluid inlet 43 of the liquid ring vacuum pump 4 through the liquid delivery pipeline II to enable the first water tank 5 to supply the working fluid to the liquid ring vacuum pump 4, so that the liquid ring vacuum pump 4 performs the vacuum pumping action.

[0046] When the above sterilizer vacuum pumping system performs the vacuum pumping operation on the sterilizer, first control the first valve 8 to open. The cooling water in the water supply source flows through the cold end 32 of the heat exchanger 3 and the cooling water inlet 52 in sequence through the first pipeline III and enters the first water tank 5. After the first water tank 5 stores a certain amount of cooling water, control the second valve 9 to close. The cooling water in the first water tank 5 flows into the working fluid inlet 43 of the liquid ring vacuum pump 4 through the liquid delivery pipeline II, and the liquid ring vacuum pump 4 starts to work. The air and water vapor (i.e., high-temperature water vapor) in the sterilizer body 1 first flow into the hot end 31 of the heat exchanger 3 through the vacuum pumping pipeline I for heat dissipation, and then the low-temperature water vapor flows through the suction and exhaust ports of the liquid ring vacuum pump 4 and the cooling water inlet 52 in sequence and enters the first water tank 5 to realize the vacuum pumping operation on the sterilizer. In addition, after the cooling water flows into the liquid ring vacuum pump 4, since the working fluid outlet is connected to the pump exhaust port 42, the cooling water can flow back to the first water tank 5 from the pump exhaust port 42 through the vacuum pumping pipeline I, that is, a cooling water circulation is formed, greatly reducing the water consumption.

[0047] During this process, the first temperature sensor 56 monitors the temperature of the cooling water in the first water tank 5 in real time and transmits it to the controller. If the temperature of the cooling water in the first water tank 5 exceeds the set threshold, it indicates that the working fluid temperature of the liquid ring vacuum pump 4 is higher than the appropriate temperature at this time, and the performance of the liquid ring vacuum pump 4 is poor, affecting the vacuum pumping operation. Then, the first valve 8 is controlled to open, and the water supply source 7 replenishes the cooling water volume into the first water tank 5 through the first pipeline III to reduce the temperature of the cooling water in the first water tank 5, that is, to reduce the working fluid temperature of the liquid ring vacuum pump 4, ensuring the normal progress of the vacuum pumping operation of the liquid ring vacuum pump 4. If the temperature of the cooling water in the first water tank 5 is lower than the set threshold, it indicates that the working fluid temperature of the liquid ring vacuum pump 4 is lower than the appropriate temperature at this time, and the performance of the liquid ring vacuum pump 4 is normal. Then, the first valve 8 is controlled to close. This temperature control method ensures that the temperature of the cooling water in the first water tank 5 conforms to the appropriate working fluid temperature of the liquid ring vacuum pump 4, enabling the liquid ring vacuum pump 4 to work normally to ensure the completion of the vacuum pumping operation of the sterilizer.

[0048] In addition, it should be noted that when the working fluid temperature of the liquid ring vacuum pump 4 is higher than the appropriate temperature, during the process of opening the first valve 8 to reduce the temperature of the cooling water in the first water tank 5, the cooling water first passes through the cold end 32 of the heat exchanger 3, which can enhance the cold quantity of the cold end 32 of the heat exchanger 3, making the temperature of the water vapor passing through the hot end 31 of the heat exchanger 3 lower, and increasing the condensation amount of the water vapor, that is, the water vapor contains a higher water content. When the water vapor flows into the first water tank 5, it can further reduce the temperature of the cooling water in the first water tank 5. Thus, the combined action of the low-temperature water vapor and the cooling water from the water supply source 7 can improve the cooling efficiency and cold quantity of the cooling water, which is beneficial to enhancing the performance of the liquid ring vacuum pump 4, that is, effectively improving the efficiency and stability of the liquid ring vacuum pump 4, and further improving the efficiency and effect of the vacuum pumping operation of the sterilizer.

[0049] Preferably, please refer to Figure 2 , the pump interface 51 is arranged at the top of the side wall of the first water tank 5. Thus, the water vapor cooled by the heat exchanger 3 can flow into the top of the first water tank 5 through the pump interface 51, and the water vapor can better utilize the gravity to separate more water. The separated water falls into the cooling water to realize the recovery of the water contained in the water vapor generated by the sterilizer, thereby effectively increasing the cold quantity of the cooling water and saving a certain amount of cooling water, that is, further reducing the water consumption.

[0050] In one embodiment, please refer to Figure 2 , the cooling water inlet 52 is arranged on the top wall of the first water tank 5, and the cooling water outlet 53 is arranged at the bottom of the side wall of the first water tank 5. Thus, the cooling water flows in the inner cavity of the first water tank 5 in the direction from top to bottom. On the one hand, it is beneficial for the cooling water to flow into the first water tank 5 without resistance by using gravity. On the other hand, the cooling water inlet and the cooling water outlet 53 are arranged in a vertical offset manner, avoiding the inflowing cooling water from hindering and interfering with the outflow of the cooling water, that is, ensuring the smooth circulation of the cooling water.

[0051] In one embodiment, please refer to Figure 1 and Figure 2 , a first discharge port 57 is provided at the bottom of the side wall of the first water tank 5. The first discharge port 57 is connected to a first drain pipe VII, and a first drain valve 11 is provided on the first drain pipe VII. Thus, during equipment maintenance, by opening the first drain valve 11, the cooling water in the first water tank 5 can be drained through the first drain pipe VII.

[0052] Based on the above embodiment, please refer to Figure 1 , the liquid supply source is also connected to a second pipe IV. The second pipe IV is connected to the liquid delivery pipe II, and a second valve 9 electrically connected to the controller is provided on the second pipe IV.

[0053] It can be understood that if the first valve 8 and the second valve 9 are opened simultaneously, the cooling water from the liquid supply source is divided into two paths. One path flows into the first water tank 5 through the first pipe III, and the other path directly flows into the working liquid inlet 43 of the liquid ring vacuum pump 4 through the second pipe IV and the liquid delivery pipe II in sequence, so as to supply liquid to the liquid ring vacuum pump 4 quickly. On the one hand, when initially starting the liquid ring vacuum pump 4, the response speed of the liquid ring vacuum pump 4 can be improved. On the other hand, when reducing the working liquid temperature of the liquid ring vacuum pump 4, the speed and effect of working liquid cooling can be greatly improved, so as to timely adjust and restore the performance of the liquid ring vacuum pump 4.

[0054] It should be noted that the sterilizer will generate high-temperature and high-pressure water vapor. After the high-temperature and high-pressure water vapor is cooled by the heat exchanger 3, it still enters the first water tank 5 under pressure. If the high-pressure water vapor is discharged into the liquid ring vacuum pump 4, it may cause cavitation phenomenon, thus affecting the working efficiency and vacuum degree of the liquid ring vacuum pump 4.

[0055] Therefore, based on the above embodiment, please refer to Figure 2 , a box body exhaust port 54 is provided on the top wall of the first water tank 5. After the high-pressure water vapor enters the first water tank 5 through the pump interface 51, the high-pressure gas will be discharged through the box body exhaust port 54, and the separation of steam and water is realized, releasing the pressure in the first water tank 5, so that the pressure in the first water tank 5 is restored to atmospheric pressure, realizing low-pressure liquid supply to the liquid ring vacuum pump 4, thus not affecting the working efficiency and vacuum degree of the liquid ring vacuum pump 4.

[0056] Based on the above embodiment, please refer to Figure 1 , a cavitation inlet 55 is also provided on the side wall of the first water tank 5. The cavitation inlet 55 is connected to the cavitation protection interface 44 of the liquid ring vacuum pump 4 through a cavitation pipe.

[0057] It can be understood that during the operation of the liquid ring vacuum pump 4, when the pressure of the liquid in the low-pressure area of the liquid ring vacuum pump 4, such as the suction area, drops below the vaporization pressure (i.e., the saturated vapor pressure) at this temperature, the liquid begins to vaporize and form bubbles, that is, cavitation occurs. Therefore, the liquid ring vacuum pump 4 is provided with a cavitation protection interface 44 communicating with its pump chamber. A cavitation pipeline is connected between the cavitation protection interface 44 and the cavitation protection interface 44 on the side wall of the first water tank 5. The bubbles in the pump chamber can be discharged into the first water tank 5 through the cavitation pipeline to reduce the bubbles and prevent the impact damage phenomenon on parts such as the impeller during the bubble bursting process.

[0058] Based on any of the above embodiments, please refer to Figure 2 , the present application further includes a second water tank 6 integrated with the first water tank 5 and located below the first water tank 5. The second water tank 6 is connected to the first water tank 5 through an overflow pipe 10, and a drain port 61 is provided on the side wall of the second water tank 6.

[0059] Specifically, the first water tank 5 and the second water tank 6 are arranged in sequence from top to bottom and are integrated. That is to say, the first water tank 5 and the second water tank 6 together form a complete box body. A horizontal partition is arranged in the inner cavity of the box body, and the partition divides the box body into the first water tank 5 and the second water tank 6. The overflow pipe 10 is arranged through the partition. The upper pipe orifice of the overflow pipe 10 is located in the first water tank 5, and the lower pipe orifice is located in the second water tank 6, so that the two water tanks are connected through the overflow pipe 10. In this way, if the cooling water level in the first water tank 5 is higher than the upper pipe orifice of the overflow pipe 10, the cooling water in the first water tank 5 is discharged into the second water tank 6 through the overflow pipe 10 and then discharged from the drain port 61 on the side wall of the second water tank 6, so as to keep the cooling water in the first water tank 5 at a certain level and discharge the excess cooling water.

[0060] Furthermore, please refer to Figure 2 , the overflow pipe 10 is arranged lower than the pump interface 51 and the cavitation inlet 55, that is, the pump interface 51 and the cavitation inlet 55 are located above the upper pipe orifice of the overflow pipe 10, that is, above the cooling water level, to avoid the overflow of the cooling water from the pump interface 51 or the cavitation inlet 55 due to too high a cooling water level.

[0061] Based on any of the above embodiments, please refer to Figure 2 , the present application further includes a second temperature sensor 64 electrically connected to the controller. The temperature probe of the second temperature sensor 64 extends into the inner cavity of the second water tank 6 for real-time monitoring of the cooling water temperature in the second water tank 6.

[0062] It can be understood that the temperature of the cooling water in the first water tank 5 (i.e., the temperature of the working fluid specified for the liquid ring vacuum pump 4) may not meet the required drainage temperature, and there may be a situation where the required drainage temperature is lower than the specified working fluid temperature. Therefore, the second temperature sensor 64 is used to monitor the temperature of the cooling water flowing into the second water tank 6 in real time and transmit it to the controller. If the temperature of the cooling water in the second water tank 6 is higher than the required drainage temperature, the controller controls the first valve 8 to open. The cooling water from the water supply source 7 first flows into the first water tank 5 through the first pipeline III. When the liquid level of the cooling water rises above the overflow pipe 10, the cooling water in the first water tank 5 flows into the second water tank 6 through the overflow pipe 10 to increase the cooling capacity of the cooling water in the second water tank 6, that is, to reduce the temperature of the cooling water in the second water tank 6, so as to achieve the required drainage temperature and realize low-temperature drainage.

[0063] It should be noted that during the pressure steam sterilization process in the inner cavity of the sterilizer body 1, a large amount of water vapor will be generated. When the water vapor contacts relatively cold components such as pipelines and valves, it will form condensed water when cooled. The accumulation of condensed water in the sterilizer body 1 will interfere with the steam flow and affect the sterilization effect, and even affect the sealing performance of the sterilizer, resulting in the equipment being unable to operate safely. In addition, the sterilizer jacket 2 sleeved on the outer periphery of the sterilizer body 1 is usually filled with condensed water to play a role in heat exchange with the sterilizer body 1, and the condensed water needs to be discharged and replaced regularly.

[0064] Based on any of the above embodiments, please refer to Figure 1 , an inner chamber water interface 62 is also provided on the side wall of the second water tank 6, and the bottom of the inner cavity of the sterilizer body 1 is connected to the inner chamber water interface 62 through the first drain pipeline V; an interlayer water interface 63 is also provided on the side wall of the second water tank 6, and the bottom of the inner cavity of the sterilizer jacket 2 sleeved on the outer periphery of the sterilizer body 1 is connected to the interlayer water interface 63 through the second drain pipeline VI.

[0065] Thus, the condensed water in the sterilizer body 1 can flow into the second water tank 6 through the first drain pipeline V, and the condensed water in the sterilizer jacket 2 can flow into the second water tank 6 through the second drain pipeline VI, thereby ensuring the normal operation and efficiency of the sterilizer. Since the high-temperature condensed water discharged from the sterilizer body 1 and the sterilizer jacket 2, the temperature of the cooling water in the second water tank 6 must be higher than the required drainage temperature. The second temperature sensor 64 can be used to monitor the temperature of the cooling water in the second water tank 6 in real time, and the controller controls the opening and closing of the first valve 8 according to the obtained temperature of the cooling water in the second water tank 6 to reduce the temperature of the cooling water in the second water tank 6. The specific control steps described above can be referred to and will not be elaborated here.

[0066] In summary, the present application can use the second water tank 6 and the second temperature sensor 64 provided therein to drain the cooling water in the first water tank 5, the condensed water in the sterilizer body 1, and the condensed water in the sterilizer jacket 2 at a low temperature.

[0067] Optionally, refer to Figure 1 , a first drain valve 13 electrically connected to the controller is provided on the first drain pipeline V, and a second drain valve 14 electrically connected to the controller is provided on the second drain pipeline VI to facilitate controlling the on / off of the first drain pipeline V and the second drain pipeline VI.

[0068] Based on any of the above embodiments, refer to Figure 2 , the overflow pipe 10 is vertically located between the inner cavities of the first water tank 5 and the second water tank 6, and a static water level overflow port 101 is provided on the pipe section of the overflow pipe 10 located in the inner cavity of the first water tank 5.

[0069] Specifically, the diameter of the static water level overflow port 101 is smaller than the pipe orifice diameter of the overflow pipe 10, and the water flow rate of the static water level overflow port 101 is smaller than the water flow rate of the upper pipe orifice of the overflow pipe 10. When the cooling water level in the first water tank 5 rises to the position of the static water level overflow port 101, the cooling water will flow to the second water tank 6 through the static water level overflow port 101. However, this opening is relatively small. If the cooling water level continues to rise, the cooling water cannot be completely drained to the second water tank 6. When the cooling water level in the first water tank 5 rises to the position of the upper pipe orifice of the overflow pipe 10, the overflow pipe 10 can drain the excess cooling water to the second water tank 6. Thus, the overflow pipe 10 configured as above is conducive to quickly draining the excess cooling water exceeding the specified level to the second water tank 6.

[0070] Optionally, the overflow pipe 10 is vertically arranged, which can further improve the speed of draining the cooling water to the second water tank 6.

[0071] Based on the above embodiment, refer to Figure 1 , the static water level overflow port 101 is not lower than the working fluid inlet 43. It can be understood that the position of the static water level overflow port 101 is the lowest cooling water level in the first water tank 5. If the static water level overflow port 101 is higher than or equal to the working fluid inlet 43 of the liquid ring circulation pump, the pressure at the working fluid inlet 43 is relatively high, and this pressure is greater than the cooling water (i.e., the saturated vapor pressure of the working fluid). The cooling water is not likely to boil and generate bubbles at the working fluid inlet 43, which is conducive to avoiding the impact of bubbles on components such as the impeller and the pump casing, and further conducive to reducing noise and achieving low-noise operation.

[0072] Preferably, when the static water level overflow port 101 and the working fluid inlet 43 are at the same height, the operating sound of the system is the lowest.

[0073] In one embodiment, refer to Figure 1 and Figure 2, a second discharge port 65 is provided on the bottom wall of the second water tank 6. The second discharge port 65 is connected to a second emptying pipeline VIII, and a second emptying valve 12 is provided on the second emptying pipeline VIII. Thus, during equipment maintenance, by opening the second emptying valve 12, the cooling water in the second water tank 6 can be emptied through the second emptying pipeline VIII.

[0074] It should be noted that in this specification, relational terms such as first and second are only used to distinguish one entity from several other entities, and do not necessarily require or imply any actual relationship or order between these entities.

[0075] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same and similar parts among the various embodiments, reference can be made to each other.

[0076] The above has introduced in detail a vacuum pumping system for a sterilizer provided by the present utility model. Specific examples are used herein to elaborate on the principle and implementation manner of the present utility model. The description of the above embodiments is only used to help understand the method and its core idea of the present utility model. It should be pointed out that for those of ordinary skill in the art in this technical field, without departing from the principle of the present utility model, several improvements and modifications can still be made to the present utility model, and these improvements and modifications also fall within the protection scope of the claims of the present utility model.

Claims

1. A vacuum pumping system for a sterilizer, characterized in that, It includes a sterilizer body (1), a heat exchanger (3), a liquid ring vacuum pump (4) and a first water tank (5). The liquid ring vacuum pump (4) is provided with a pump suction port (41), a pump exhaust port (42), a working liquid inlet (43) and a working liquid outlet communicating with the pump exhaust port (42). On the side wall of the first water tank (5), there are a pump interface (51), a cooling water inlet (52) and a cooling water outlet (53). It further includes: An air extraction pipeline (I) sequentially connecting the sterilizer body (1), the hot end (31) of the heat exchanger (3), the pump suction port (41), the pump exhaust port (42) and the pump interface (51); A liquid supply source connected to a first pipeline (III), and the first pipeline (III) sequentially connects a first valve (8), the cold end (32) of the heat exchanger (3) and the cooling water inlet (52); A liquid delivery pipeline (II) connecting the cooling water outlet (53) and the working liquid inlet (43); A first temperature sensor (56) whose temperature probe extends into the inner cavity bottom of the first water tank (5) for real-time monitoring of the cooling water temperature in the first water tank (5); A controller electrically connected to the first temperature sensor (56) and the first valve (8) for acquiring the cooling water temperature data and controlling the opening and closing of the first valve (8).

2. The sterilizer vacuum pumping system according to claim 1, characterized in that, The liquid supply source is further connected to a second pipeline (IV), the second pipeline (IV) is connected to the liquid delivery pipeline (II), and the second pipeline (IV) is provided with a second valve (9) electrically connected to the controller.

3. The sterilizer vacuum pumping system according to claim 1, characterized in that, The top wall of the first water tank (5) is provided with a tank body exhaust port (54).

4. The vacuum extraction system of the sterilizer according to any one of claims 1 to 3, characterized in that The side wall of the first water tank (5) is further provided with a cavitation inlet (55), and the cavitation inlet (55) is connected to the cavitation protection interface (44) of the liquid ring vacuum pump (4) through a cavitation pipeline.

5. The sterilizer vacuum pumping system according to claim 4, characterized in that, It further includes a second water tank (6) integrated with the first water tank (5) and located below the first water tank (5). The second water tank (6) is communicated with the first water tank (5) through an overflow pipe (10), and a drain port (61) is provided on the side wall of the second water tank (6).

6. The vacuum extraction system of the sterilizer according to claim 5, characterized in that, It further includes a second temperature sensor (64) electrically connected to the controller. The temperature probe of the second temperature sensor (64) extends into the inner cavity of the second water tank (6) for real-time monitoring of the cooling water temperature in the second water tank (6).

7. The vacuum extraction system of the sterilizer according to claim 6, characterized in that, An inner chamber water interface (62) is provided on the side wall of the second water tank (6), and the inner cavity bottom of the sterilizer body (1) is connected to the inner chamber water interface (62) through a first liquid discharge pipeline (V); A jacket water interface (63) is further provided on the side wall of the second water tank (6), and the inner cavity bottom of a sterilizer jacket (2) sleeved on the outer periphery of the sterilizer body (1) is connected to the jacket water interface (63) through a second liquid discharge pipeline (VI).

8. The vacuum extraction system of the sterilizer according to claim 5, characterized in that The overflow pipe (10) is arranged lower than the pump interface (51) and the cavitation inlet (55).

9. The sterilizer vacuum pumping system according to claim 5, wherein The overflow pipe (10) is located between the inner cavities of the first water tank (5) and the second water tank (6), and a still water level overflow port (101) is provided on the pipe section of the overflow pipe (10) located in the inner cavity of the first water tank (5).

10. The sterilizer vacuum pumping system according to claim 9, characterized in that, The still water level overflow port (101) is not lower than the working fluid inlet (43).

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