Novel self-produced steam type sterilizer
Patent Information
- Application Number
- CN202420508238.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-02-25
- Estimated Expiration
- 2034-03-15
Smart Images
Figure CN222517350U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of medical equipment, and specifically relates to a novel self-generated steam sterilizer. Background Art
[0002] Self-produced steam sterilizer is a common type of sterilizer on the market. Currently, self-produced steam sterilizers on the market have a small steam generator integrated inside. The built-in steam generator is divided into gas phase space and liquid phase space. Since the overall volume of the steam generator is relatively small, the gas phase space is relatively small, resulting in a small steam storage space and a small amount of steam storage. When the sterilizer runs a program cycle and requires saturated steam, the pressure inside the built-in steam generator will drop rapidly, and the water droplets carried in the steam will increase, resulting in increased steam humidity, which can easily lead to problems such as wet packs and slow heating during the sterilization process.
[0003] The existing technology adds secondary electric heating after the steam generator, which can also reduce the water content in the final steam. However, experiments have shown that direct secondary electric heating will make the superheated steam unstable and overshoot serious. The hot steam finally obtained is not ideal, and direct use of secondary electric heating has certain safety hazards. Utility Model Content
[0004] The utility model aims to overcome the deficiencies of the prior art and provide a novel self-generating steam sterilizer, which can improve the quality of steam, remove excess water droplets in the steam, and improve the quality of sterilization.
[0005] To achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a new type of self-generated steam sterilizer, including a sterilizer body and a steam generator connected to each other, a heat exchanger and a heater are arranged between the sterilizer body and the steam generator, the steam inlet of the heat exchanger is connected to the steam outlet of the steam generator, the steam outlet of the heat exchanger is connected to the steam inlet of the sterilizer body, the heat exchanger is nested in the heater, and a drain port is arranged below the steam outlet of the heat exchanger.
[0006] Preferably, the heat exchanger is a shell and tube heat exchanger or a shell and tube heat exchanger.
[0007] Preferably, the heater and the steam generator are both connected to a liquid level detection mechanism and a pressure detection mechanism.
[0008] Preferably, the liquid level detection mechanism is a liquid level sensor, and the liquid level sensor is connected to one side of the heater and the steam generator respectively.
[0009] Preferably, the pressure detection mechanism comprises a pressure sensor and a pressure gauge, and the pressure sensor and the pressure gauge are respectively connected to the upper side of the heater and the steam generator.
[0010] Preferably, the heater and the steam generator are both provided with safety detection ports, and safety valves are provided at the safety detection ports.
[0011] Preferably, the heater and the steam generator are both provided with electric heating tubes, and the electric heating tubes are both provided with dry-burning protection thermocouples.
[0012] Preferably, temperature detection mechanisms are provided at the steam outlet of the steam generator and the steam outlet of the heat exchanger.
[0013] Preferably, an automatic drain valve and a manual drain valve are provided in parallel on the drain pipe of the steam generator and the drain pipe of the heater.
[0014] Preferably, the drain port of the heat exchanger is connected to a drain pipeline, a drain valve and a one-way valve are provided on the drain pipeline, and a bypass valve is also provided in parallel on one side of the drain valve and the one-way valve.
[0015] Preferably, a steam inlet seal and a steam outlet seal are respectively provided at both ends of the heat exchanger, and the steam outlet seal of the heat exchanger separates steam and water from the sterilizing steam to further improve the saturation of the steam.
[0016] Compared with the prior art, the above technical solution has the following beneficial effects:
[0017] 1. The utility model is provided with a heat exchanger and a heater between the sterilizer body and the steam generator, and the steam generated by the steam generator is evaporated again by heat exchange, and the moisture in the heat exchanger is discharged through the drain port. Through many experiments, it is found that the superheat of the hot steam coming out of the heat exchanger is stable, and the moisture content of the hot steam is less than that of direct secondary electric heating, which further avoids the problems of wet packing and slow heating during the sterilization process. Through the secondary heat exchange method, the superheat of the sterilization steam can be freely adjusted; the utility model has a simple structure, is easy to install, is easy to implement and has high safety.
[0018] 2. Due to the physical properties of saturated steam, saturated steam at a certain temperature corresponds to a fixed pressure. The utility model controls the temperature of the steam in the heater and the steam generator by detecting the pressure in the heater and the steam generator. Rapid control response can be achieved through steam pressure. The lag of temperature detection is relatively large, and the steam temperature control accuracy is not as accurate as pressure control. Therefore, the utility model selects pressure control and detection.
[0019] 3. The steam generator and heater are both equipped with automatic drain valves to automatically drain sewage at a fixed time to avoid the generation of concentrated water with excessively high conductivity and ensure the cleanliness of the steam generated by the steam generator. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1It is a schematic diagram of the structure of the utility model, wherein the arrow indicates the flow direction of the medium.
[0021] Figure 2 It is a schematic structural diagram of the steam generator part in the utility model, wherein the arrow indicates the flow direction of the medium.
[0022] Figure 3 It is a schematic diagram of the structure of the dehumidification mechanism in the utility model, wherein the arrow indicates the flow direction of the medium.
[0023] Among them: 1. Dehumidification mechanism 2. Steam generator 3. Water injection pump 4. Sterilizer body 5. Water supply port 6. Main drain port 7. Heater 8. Heat exchanger 9. Pressure gauge 10. Safety valve 11. Pressure sensor 12. Temperature sensor 13. Second water inlet check valve 14. First water inlet check valve 15. Heater water injection valve 16. Liquid level sensor 17. Automatic drain valve 18. Manual drain valve 19. Electric heating pipe 20. Drain valve 21. Check valve 22. Bypass valve 23. Dry-burning protection thermocouple 24. Heat exchanger steam inlet 25 , four-way valve 26, heater inspection port 27, heater water inlet 28, heater drain port 29, three-way valve 30, heat exchanger steam outlet 31, drain port 32, heater upper liquid level port 33, heater lower liquid level port 34, steam outlet seal 35, steam inlet seal 36, evaporator body 37, steam outlet check valve 38, evaporator water injection valve 39, evaporator steam outlet 40, evaporator inspection port 41, evaporator drain port 42, evaporator water inlet 43, evaporator upper liquid level port 44, evaporator lower liquid level port 45, interlayer steam inlet valve. DETAILED DESCRIPTION
[0024] Figures 1 to 3 It is the best embodiment of the utility model, and the following Figures 1 to 3 The utility model is further described.
[0025] like Figure 1As shown, a new type of self-generated steam sterilizer of the utility model includes a sterilizer body 4 and a steam generator 2 connected to each other. The steam generator 2 delivers steam to the sterilizer body 4. A heat exchanger 8 and a heater 7 are arranged between the sterilizer body 4 and the steam generator 2. The heat exchanger 8 is nested in the heater 7. The steam inlet of the heat exchanger 8 is connected to the steam outlet of the steam generator 2. The heating temperature threshold of the heater 7 is higher than that of the steam generator 2. The heat exchanger 8 and the heater 7 act as a dehumidification mechanism 1 to reheat the steam generated by the steam generator 2 to further reduce the moisture in the steam. The steam outlet of the heat exchanger 8 is connected to the steam inlet of the sterilizer body 4. A drain port 31 is arranged below the steam outlet of the heat exchanger 8. The water in the heat exchanger 8 is discharged from the drain port 31, so that the moisture content of the steam finally entering the sterilizer body 4 is reduced, thereby avoiding problems such as wet packing and slow heating during the sterilization process.
[0026] The water inlets of the steam generator 2 and the heater 7 are both connected to the water injection pump 3. The water inlet of the water injection pump 3 is connected to the water supply port 5. The water pumped out by the water injection pump 3 is supplied to the steam generator 2 and the heater 7 respectively. The water enters the steam generator 2 and is heated and evaporated into steam. Finally, the steam in the steam generator 2 enters the heat exchanger 8. The heat exchanger 8 is nested in the heater 7. The water enters the heater 7 and is heated. The temperature in the heater 7 is higher than the temperature in the steam generator 2. Therefore, the steam in the heat exchanger 8 exchanges heat with the heater 7 again, causing the steam in the heat exchanger 8 to evaporate again. Finally, the interlayer steam inlet valve 45 of the sterilizer body 4 is opened to allow the steam to enter the sterilizer body 4 from the steam outlet of the heat exchanger 8.
[0027] like Figure 2 As shown, the steam generator 2 includes an evaporator body 36, an evaporator water inlet 42 is connected to a water inlet pipe, the water inlet pipe is connected to the water outlet of the water injection pump 3, an evaporator water injection valve 38 is arranged on the water inlet pipe of the steam generator 2, and two water inlet check valves are arranged on the side of the evaporator water injection valve 38 close to the steam generator 2, which are a first water inlet check valve 14 and a second water inlet check valve 13. The two water inlet check valves ensure that the water in the water inlet pipe can only flow from one end of the water injection pump 3 to the steam generator 2.
[0028] An electric heating tube 19 is arranged in the steam generator 2. The electric heating tube 19 is provided with a dry-burning protection thermocouple 23. The electric heating tube 19 heats the water in the steam generator 2 to evaporate it into steam. When the dry-burning protection thermocouple 23 detects that the electric heating tube 19 is overheated, the power supply of the electric heating tube 19 is automatically cut off to prevent the electric heating tube 19 from being overheated and causing malfunctions or even dangers.
[0029] A liquid level detection mechanism is provided on one side of the evaporator body 36. The liquid level detection mechanism in this embodiment is a liquid level sensor 16. The liquid level sensor 16 is provided with a maximum liquid level and a minimum liquid level. The maximum liquid level corresponds to the evaporator upper liquid level port 43 of the evaporator body 36, and the minimum liquid level corresponds to the evaporator lower liquid level port 44 of the evaporator body 36. The liquid level sensor 16 detects that the liquid level in the evaporator body 36 is lower than the lower limit value, starts the water injection pump 3 and opens the evaporator water injection valve 38 until the liquid level in the evaporator body 36 is greater than the lower limit value, and the electric heating tube 19 starts to heat. At this time, water injection continues until the liquid level in the evaporator body 36 is greater than the upper limit value, and water injection is stopped. The heating tube 19 continues to heat to the specified threshold value.
[0030] The steam generated after heating is transported from the evaporator steam outlet 39 to the heat exchanger 8. A steam outlet check valve 37 is also provided on one side of the evaporator steam outlet 39 to ensure that the steam can only enter the heat exchanger 8 from the steam generator 2. A temperature sensor 12 is also provided between the evaporator steam outlet 39 and the steam outlet check valve 37. The temperature sensor 12 is connected to the pipeline between the steam generator 2 and the heat exchanger 8 through a tee 29. The temperature sensor 12 detects the temperature of the steam transported from the steam generator 2.
[0031] like Figure 3 As shown, the steam in the steam generator 2 enters the heat exchanger 8 from the heat exchanger steam inlet 24. The steam is in the heat exchanger 8, and the heat exchanger 8 is nested in the heater 7. The steam exchanges heat with the higher temperature steam generated by the heater 7, so that the steam in the heat exchanger 8 further evaporates and its moisture content is further reduced. The heat exchanger 8 in this embodiment is a shell and tube heat exchanger or a shell and tube heat exchanger. Finally, the steam enters the sterilizer body 4 from the heat exchanger steam outlet 30. A temperature sensor 12 is also provided on one side of the heat exchanger steam outlet 30. The temperature sensor 12 is connected to the pipeline through a tee 29.
[0032] The heater water inlet 27 is connected to the water inlet pipe, and the water inlet pipe is connected to the water outlet of the water injection pump 3. A heater water injection valve 15 is arranged on the water inlet pipe of the heater 7. Two water inlet check valves are also arranged on the side of the heater water injection valve 15 close to the heater 7. The two water inlet check valves ensure that the water in the water inlet pipe can only flow into the heater 7 from one end of the water injection pump 3.
[0033] A liquid level sensor 16 is also provided on one side of the heater 7. The liquid level sensor 16 is provided with a maximum liquid level and a minimum liquid level. The maximum liquid level corresponds to the upper liquid level port 32 of the heater, and the minimum liquid level corresponds to the lower liquid level port 33 of the heater. The liquid level sensor 16 detects that the liquid level in the heater 7 is lower than the lower limit, starts the water injection pump 3 and opens the heater water injection valve 15 until the liquid level in the heater 7 is greater than the lower limit, and the electric heating tube 19 starts to heat. At this time, water continues to be injected until the liquid level in the heater 7 is greater than the upper limit, and then the water injection is stopped. The heating tube 19 continues to heat to the specified threshold. The electric heating tube 19 is provided in the heater 7. The electric heating tube 19 is provided with a dry-burning protection thermocouple 23. The electric heating tube 19 heats the water in the heater 7 to evaporate it into high-temperature steam for heat exchange with the steam in the heat exchanger 8.
[0034] The heating temperature threshold of the heater 7 must be higher than that of the steam generator 2 so that the steam in the heat exchanger 8 can be reheated. In this embodiment, a pressure detection mechanism is used to detect the steam temperature in the steam generator 2 and the heater 7. Due to the physical properties of saturated steam, saturated steam at a certain temperature corresponds to a fixed pressure. In this embodiment, the pressure in the heater 7 and the steam generator 2 is detected to control the temperature of the steam in the heater 7 and the steam generator 2. Rapid control response can be achieved through steam pressure. The lag of temperature detection is relatively large, and the steam temperature control accuracy is not as accurate as pressure control. Therefore, pressure control and detection are selected in this embodiment.
[0035] The pressure detection mechanism includes a pressure sensor 11 and a pressure gauge 9. The pressure sensor 11 and the pressure gauge 9 are arranged on the upper side of the heater 7 and the steam generator 2. The temperature of the steam is determined by detecting the steam pressure. The temperature detected by the temperature sensor 12 is the initial temperature T1 of the sterilization steam, and the temperature detected by the temperature sensor 12 is the final temperature T2 of the sterilization steam. The sterilization steam superheat temperature value ΔT and the heating steam pressure control hysteresis ΔP are set in the system. The sum of (T1+ΔT) is the target temperature of the sterilization steam, which is set as T. Due to the physical properties of saturated steam, saturated steam at a certain temperature corresponds to a fixed pressure. Therefore, the sterilization steam target temperature T is converted into the corresponding steam pressure and set to P. This pressure is the lower limit of the heating steam control pressure of the heater 7, and P+ΔP is the upper limit of the steam control pressure of the heater 7. When the liquid level in the heater 7 is greater than the lower limit of the liquid level setting and the pressure detected by the pressure sensor 11 is less than or equal to the lower limit of the heating steam pressure, the electric heating tube 19 starts heating; when the pressure detected by the pressure sensor 11 is greater than or equal to the upper limit of the heating steam pressure, the electric heating tube 19 stops heating, thereby repeating the action of starting and stopping heating, so that the pressure in the heater 7 is maintained between the upper limit and the lower limit, ensuring that the steam in the heat exchanger 8 is heated and evaporated for the second time.
[0036] Safety detection ports are provided on the heater 7 and the steam generator 2, which are the heater detection port 26 and the evaporator detection port 40, respectively. Safety valves 10 are provided at the safety detection ports. In this embodiment, the safety valve 10, the pressure gauge 9 and the pressure sensor 11 are connected to a main pipeline through a four-way 25, and finally the end of the main pipeline is connected to the safety detection port.
[0037] The evaporator drain port 41 and the heater drain port 28 are both connected to a drain pipeline. An automatic drain valve 17 and a manual drain valve 18 are both provided in parallel on the drain pipe of the steam generator 2 and the drain pipe of the heater 7. The drain ports of the steam generator 2 and the heater 7 are connected to the automatic drain valve 17. Both ends of the manual drain valve 18 are connected in parallel to the drain pipeline through a tee 29. Finally, the drain pipelines of the steam generator 2 and the heater 7 are both connected to the main drain port 6. The steam generator 2 and the heater 7 can be automatically and regularly drained through the automatic drain valve 17 to avoid the occurrence of concentrated water with excessively high conductivity and ensure the cleanliness of the sterilization steam produced by the steam generator 2. The water in the steam generator 2 and the heater 7 can also be manually discharged through the manual drain valve 18.
[0038] The sterilizing steam is reheated in the tubes of the heat exchanger 8 by the heating steam filled in the heater 7. The steam inlet seal 35 and the steam outlet seal 34 are respectively provided at both ends of the heat exchanger 8. The sterilizing steam is subjected to steam-water separation at the steam outlet seal 34. The sterilizing steam is output from the steam outlet 30 of the heat exchanger to the sterilizer body 4. The separated water droplets gather at the bottom of the steam outlet seal 34 and are discharged from the drain port 31 of the heat exchanger 8, thereby finally achieving the purpose of improving the steam quality and adjusting the steam saturation and superheat. The drain port 31 is connected to a drain pipeline, and a drain valve 20 and a check valve 21 are provided on the drain pipeline. A bypass valve 22 is also provided in parallel on one side of the drain valve 20 and the check valve 21. The steam outlet seal 34 of the heat exchanger 8 can be automatically drained regularly through the drain valve 20 and the check valve 21, and can also be manually drained through the bypass valve 22.
[0039] When the utility model is in use, the liquid level sensor 16 detects that the liquid level in the steam generator 2 and the heater 7 is lower than the lower limit value, starts the water injection pump 3 and opens the heater water injection valve 15 and the evaporator water injection valve 38, until the liquid level in the steam generator 2 and the heater 7 is greater than the lower limit value, the electric heating tube 19 of the steam generator 2 and the heater 7 starts to heat, and at this time the water injection pump 3 continues to inject water until the liquid level in the steam generator 2 and the heater 7 is greater than the upper limit value, and then stops injecting water.
[0040] The electric heating tube 19 continues to heat until the pressure sensor 11 detects that the pressures in the steam generator 2 and the heater 7 have reached their respective upper limits, and then stops heating. The steam in the steam generator 2 enters the heat exchanger 8 from the evaporator steam outlet 39. The steam temperature in the heat exchanger 8 is lower than the steam temperature in the heater 7. Therefore, the steam is reheated and dehumidified in the heat exchanger 8. Finally, the dehumidified steam is transported from the heat exchanger steam outlet 30 to the sterilizer body 4 for sterilization. At this time, the sterilized steam has a low water content and stable overheating, avoiding problems such as wet packing and slow heating during the sterilization process. By adjusting the heating temperature of the heater 7 and then through secondary heat exchange, the superheat of the sterilization steam can be freely adjusted.
[0041] The above is only the preferred embodiment of the utility model, and does not limit the utility model in other forms. Any technician familiar with the profession may use the technical content disclosed above to change or modify it into an equivalent embodiment with equivalent changes. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the technical solution of the utility model still belongs to the protection scope of the technical solution of the utility model.
Claims
1. A novel self-generating steam sterilizer, comprising a sterilizer body (4) and a steam generator (2) connected to each other, characterized in that: A heat exchanger (8) and a heater (7) are provided between the sterilizer body (4) and the steam generator (2); the steam inlet of the heat exchanger (8) is connected to the steam outlet of the steam generator (2); the steam outlet of the heat exchanger (8) is connected to the steam inlet of the sterilizer body (4); the heat exchanger (8) is nested in the heater (7); and a drain port (31) is provided below the steam outlet of the heat exchanger (8).
2. A novel self-generating steam sterilizer according to claim 1, characterized in that: The heat exchanger (8) is a shell-and-tube heat exchanger or a shell-and-tube heat exchanger.
3. A novel self-generating steam sterilizer according to claim 1, characterized in that: The heater (7) and the steam generator (2) are both connected to a liquid level detection mechanism and a pressure detection mechanism.
4. A novel self-generating steam sterilizer according to claim 3, characterized in that: The liquid level detection mechanism is a liquid level sensor (16), and the liquid level sensor (16) is connected to one side of the heater (7) and the steam generator (2), respectively.
5. A novel self-generating steam sterilizer according to claim 3, characterized in that: The pressure detection mechanism comprises a pressure sensor (11) and a pressure gauge (9), and the pressure sensor (11) and the pressure gauge (9) are respectively connected to the upper side of the heater (7) and the steam generator (2).
6. A novel self-generating steam sterilizer according to claim 1, characterized in that: The heater (7) and the steam generator (2) are both provided with safety detection ports, and safety valves (10) are both provided at the safety detection ports.
7. A novel self-generating steam sterilizer according to claim 1, characterized in that: The heater (7) and the steam generator (2) are both provided with electric heating tubes (19), and the electric heating tubes (19) are both provided with dry-burning protection thermocouples (23).
8. A novel self-generating steam sterilizer according to claim 1, characterized in that: Temperature detection mechanisms are provided at the steam outlet of the steam generator (2) and the steam outlet of the heat exchanger (8).
9. A novel self-generating steam sterilizer according to claim 1, characterized in that: An automatic drain valve (17) and a manual drain valve (18) are arranged in parallel on the drain pipe of the steam generator (2) and the drain pipe of the heater (7).
10. A novel self-generating steam sterilizer according to claim 1, characterized in that: The drain port (31) of the heat exchanger (8) is connected to a drain pipeline, on which a drain valve (20) and a one-way valve (21) are arranged, and a bypass valve (22) is also arranged in parallel on one side of the drain valve (20) and the one-way valve (21).