Medical bed air conditioning system

Abstract

The utility model discloses a kind of air conditioning systems for medical bed, including the refrigerant circulation subsystem being located outside medical bed, cooling liquid circulation subsystem, the refrigerant in refrigerant circulation subsystem and the cooling liquid in cooling liquid circulation subsystem carry out heat exchange, still include several cold air unit, each cold air unit is respectively located in the breathable mattress of medical bed;Each cold air unit respectively includes circulating water pump, fan, heat exchanger, check valve;The circulating water pump in each cold air unit respectively inputs cooling liquid from cooling liquid circulation subsystem, cooling liquid returns to cooling liquid circulation subsystem after successively flowing through heat exchanger, check valve, fan forms the wind passing through heat exchanger and cooling liquid to carry out heat exchange, and by fan, the wind after cooling and dehumidification is sent to the hole of breathable mattress surface.The utility model can reduce the probability of patient sweating and reduce the probability of patient bed sore.

Description

Technical Field

[0001] This utility model relates to the field of air conditioning for medical equipment, specifically an air conditioning system for medical beds. Background Technology

[0002] Currently, hospitals and healthcare institutions have a large number of medical beds in use. Most of these beds consist of a simple bed frame and a breathable mattress. Patients lying on these beds often experience low comfort, especially those who are paralyzed or unable to move freely. In summer, the prolonged contact between the patient's body and the breathable mattress hinders heat dissipation, leading to high temperatures at the contact point. This causes excessive sweating and bacterial growth, hindering recovery and requiring frequent repositioning to prevent bedsores. Therefore, there is an urgent need to develop an add-on device for ordinary medical beds to address the problems of sweating and bedsores in immobile patients caused by existing medical beds. Utility Model Content

[0003] This invention provides an air conditioning system for medical beds to solve the problems of sweating and bedsores in patients who cannot be moved in existing medical beds.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: An air conditioning system for a medical bed includes a refrigerant circulation subsystem and a coolant circulation subsystem located outside the medical bed. The refrigerant in the refrigerant circulation subsystem exchanges heat with the coolant in the coolant circulation subsystem, cooling the coolant in the coolant circulation subsystem. The system also includes several air cooling units, each located within the breathable mattress of the medical bed. Each air cooling unit includes a circulating water pump, a fan, a heat exchanger, and a one-way valve. The circulating water pump in each air cooling unit inputs the cooled coolant from the coolant circulation subsystem, and the pump causes the coolant to flow sequentially through the heat exchanger and the one-way valve before returning it to the coolant circulation subsystem. In each air cooling unit, the fan generates air that passes through the heat exchanger. The air is cooled by heat exchange between the air and the coolant flowing through the heat exchanger, and the fan then delivers the cooled and dehumidified air to the pores on the surface of the breathable mattress.

[0005] Furthermore, the refrigerant circulation subsystem includes a compressor (1), a condenser (3) with a condensing fan (2), a liquid receiver (4), a filter (5), a thermostatic expansion valve (6), and an evaporator (7), wherein the evaporator (7) is a plate heat exchanger with a refrigerant flow channel and a coolant flow channel; the refrigerant output from the compressor (1) passes through the refrigerant flow channels in the condenser (3), liquid receiver (4), filter (5), thermostatic expansion valve (6), and evaporator (7) in sequence and then returns to the compressor (1), thereby forming a refrigerant circulation.

[0006] Furthermore, the coolant circulation subsystem includes a water tank (13), a water pump (9), and a coolant flow channel for the evaporator (7) in the refrigerant circulation subsystem. The water pump (9) transports the coolant in the water tank (13) to the coolant flow channel of the evaporator (7). After passing through the coolant flow channel of the evaporator (7), the coolant returns to the water tank (13), thereby forming a coolant circulation. The water tank (13) is also connected to the circulating water pump in each air-cooled unit, and the circulating water pump in each air-cooled unit draws coolant from the water tank (13).

[0007] Furthermore, it also includes a controller (12) and an auxiliary temperature sensor and a flow switch (11). The flow switch (11) is used to collect the flow rate of coolant from the coolant channel of the evaporator (7) to the water tank (13) in the coolant circulation subsystem. The temperature sensor is used to collect the temperature of coolant from the water tank (13) to the water pump (9) in the coolant circulation subsystem. The flow switch (11) and the temperature sensor are respectively electrically connected to the controller (12) for signal transmission. The controller (12) is electrically connected to the compressor (1) in the refrigerant circulation subsystem for control.

[0008] This invention is integrated into a medical bed, providing a cool environment for paralyzed or immobile patients lying on the bed during hot weather, reducing the likelihood of sweating and bedsores. Attached Figure Description

[0009] Figure 1 This is a structural diagram of an embodiment of the present utility model.

[0010] Figure 2 This is a schematic diagram of the integrated structure of a single air-cooling unit in a breathable mattress of a medical bed, as described in this utility model embodiment. Detailed Implementation

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] like Figure 1As shown, this embodiment discloses an air conditioning system for a medical bed, including a refrigerant circulation subsystem, a coolant circulation subsystem, and several air cooling units integrated into the breathable mattress of the medical bed.

[0013] The refrigerant circulation subsystem is located outside the breathable mattress of the medical bed. This subsystem includes a compressor 1, a condenser 3 with a condenser fan 2, a receiver 4, a filter 5, a thermostatic expansion valve 6, and an evaporator 7. The evaporator 7 is a plate heat exchanger with refrigerant and coolant channels. The refrigerant outlet of the compressor 1 is connected to one end of the condenser 3 via a pipe. The other end of the condenser 3 is connected to the inlet of the receiver 4 via a pipe. The outlet of the receiver 4 is connected to the inlet of the dryer filter 5 via a pipe. The outlet of the dryer filter 5 is connected to the inlet of the thermostatic expansion valve 6 via a pipe. The outlet of the thermostatic expansion valve 6 is connected to one end of the refrigerant channel of the evaporator 7 via a pipe. The other end of the refrigerant channel of the evaporator 7 is connected to the refrigerant return port of the compressor 1 via a pipe.

[0014] In the refrigerant cycle subsystem, compressor 1 compresses the refrigerant into a high-temperature, high-pressure gas and delivers it to condenser 3. In condenser 3, the refrigerant is cooled into a high-pressure liquid (heat is carried away by the air blown by condenser fan 2). The high-pressure refrigerant liquid then flows sequentially through receiver 4, through filter 5 for filtration, and through thermostatic expansion valve 6 (throttling device) for pressure reduction before flowing into the refrigerant channel of evaporator 7 (plate heat exchanger). In the refrigerant channel of evaporator 7, the low-pressure liquid refrigerant evaporates and absorbs heat, cooling the coolant flowing through the coolant channel of evaporator 7. After absorbing heat and evaporating, the refrigerant in the refrigerant channel of evaporator 7 forms refrigerant gas, which is then drawn back into compressor 1. This cycle repeats, forming a refrigeration cycle that continuously cools the coolant flowing through the coolant channel of evaporator 7. The refrigerant used is R134a.

[0015] The coolant circulation subsystem is located outside the breathable mattress of the medical bed. This subsystem includes a water pump 9, a filter 10, a water tank 13, and the coolant flow channel of the evaporator 7 within the refrigerant circulation subsystem. The water tank 13 stores coolant. The outlet of the water tank 13 is connected to the inlet of the filter 10 via a pipe. The outlet of the filter 10 is connected to the inlet of the water pump 9 via a pipe. The outlet of the water pump 9 is connected to one end of the coolant flow channel of the evaporator 7 via a pipe 8. The other end of the coolant flow channel of the evaporator 7 is connected to the inlet of the water tank 13 via a pipe.

[0016] In the coolant circulation subsystem, water pump 9 draws coolant from water tank 13 and delivers it to the coolant channel of evaporator 7 (plate heat exchanger). Inside evaporator 7, the coolant exchanges heat with the refrigerant, and the refrigerant absorbs heat to cool the coolant. The cooled coolant, having absorbed heat, eventually returns to water tank 13 from the coolant channel of evaporator 7, thus continuously circulating to form the coolant circulation system. The hot coolant in water tank 13 is continuously circulated to evaporator 7 (plate heat exchanger) for cooling. Filter 10 is installed at the inlet of water pump 9 to filter out impurities in the coolant.

[0017] Several air-cooling units are installed within the breathable mattress of the medical bed. For example... Figure 2 As shown, the breathable mattress 26 of the medical bed has multiple cavities, each corresponding to a different position on the human body, such as the back, waist, and legs. The surface of the breathable mattress 26 has multiple sets of through holes corresponding to each cavity area. The lower end of each through hole connects to the corresponding cavity area, and the upper end of each through hole connects to the top of the breathable mattress 26.

[0018] Each air cooler unit includes a circulating water pump, a high-pressure fan, a heat exchanger, and a check valve. In each air cooler unit, the inlet of the circulating water pump is connected to the other outlet of the water tank 13 in the coolant circulation subsystem via a pipeline. The outlet of the circulating water pump is connected to one end of the heat exchanger via a pipeline. The other end of the heat exchanger is connected to the inlet of the check valve via a pipeline. The outlet of the check valve is connected to the other inlet of the water tank 13 via a pipeline.

[0019] like Figure 2 As shown, in each air-cooling unit, the circulating water pump is located at the bottom of the cavity of the breathable mattress 26 of the medical bed, and the one-way valve is located on the other side of the air conditioner of the breathable mattress. The heat exchanger and the high-pressure fan are respectively located in the cavity of the breathable mattress 26. The heat exchanger is located below the high-pressure fan. The air-facing side of the heat exchanger faces downward toward the area below the cavity of the breathable mattress, the air-discharge side of the heat exchanger faces the air-inlet side of the high-pressure fan, and the air-discharge side of the high-pressure fan faces upward toward the lower end of each through hole on the surface of the breathable mattress corresponding to the cavity of the breathable mattress.

[0020] The circulating water pump in each air cooler unit draws cooled coolant from the water tank 13 of the coolant circulation subsystem. The coolant then flows through the heat exchanger and one-way valve before returning to the water tank 13 of the coolant circulation subsystem. In each air cooler unit, a high-pressure fan generates air. As the air passes through the heat exchanger, it exchanges heat with the coolant flowing through the heat exchanger, thereby cooling the air. Finally, the high-pressure fan delivers the cooled and dehumidified air to the holes on the surface of the breathable mattress 26.

[0021] This embodiment uses a total of three sets of cooling units as an example for explanation. The three sets of cooling units are a back cooling unit, a waist cooling unit, and a leg cooling unit. The back cooling unit is located in the cavity of the breathable mattress 26 corresponding to the back position, the waist cooling unit is located in the cavity of the breathable mattress 26 corresponding to the waist position, and the leg cooling unit is located in the cavity of the breathable mattress 26 corresponding to the leg position.

[0022] The back-mounted cooling unit includes a back-mounted circulating water pump 14, a back-mounted heat exchanger 16 (copper tube with fins), a back-mounted high-pressure fan 15, and a back-mounted one-way valve 17. The back-mounted circulating water pump 14 draws low-temperature coolant from the water tank 13. The low-temperature coolant flows through the back-mounted heat exchanger 16 and exchanges heat with the air blown in by the back-mounted high-pressure fan 15, cooling and dehumidifying the air. The cool, dry air is blown onto the patient's back through the holes of the breathable mattress 26, drying and cooling the patient's back skin. When the air blown in by the back-mounted high-pressure fan 15 passes through the holes of the breathable mattress, the air velocity is further increased due to the contraction of the holes under thermal expansion and contraction, which can provide a blowing massage to the patient's back.

[0023] The lumbar cooling unit includes a lumbar circulating water pump 18, a lumbar heat exchanger 20 (copper tube with fins), a lumbar high-pressure fan 19, and a lumbar one-way valve 21. The lumbar circulating water pump 18 draws low-temperature coolant from the water tank 13. The low-temperature coolant flows through the lumbar heat exchanger 20 and exchanges heat with the air blown in by the lumbar high-pressure fan 19, cooling and dehumidifying the air. The cool, dry air is blown into the patient's lumbar region through the holes in the breathable mattress 26, drying and cooling the patient's lumbar skin. When the air blown in by the lumbar high-pressure fan 19 passes through the holes in the breathable mattress 26, the air velocity increases further due to the contraction of the holes under thermal expansion and contraction, providing a blowing massage to the patient's lumbar region.

[0024] The leg cooling unit includes a leg circulating water pump 22, a leg heat exchanger 24 (copper tube with fins), a leg high-pressure fan 23, and a leg one-way valve 25. The leg circulating water pump 22 draws low-temperature coolant from the water tank 13. The low-temperature coolant flows through the leg heat exchanger 24 and exchanges heat with the air blown in by the leg high-pressure fan 23, cooling and dehumidifying the air. The cool, dry air is blown onto the patient's legs through the holes in the breathable mattress 26, drying and cooling the patient's leg skin. When the air blown in by the leg high-pressure fan 23 passes through the holes in the breathable mattress 26, the air velocity is further increased due to the contraction of the holes under thermal expansion and contraction, which can provide a blowing massage to the patient's legs.

[0025] The breathable mattress 26 used in this embodiment can massage the body of a patient lying on the medical bed by blowing moderately pressurized air through the perforations on the surface of the breathable mattress 26 when the whole system is working.

[0026] This embodiment also includes a controller 12 and an associated temperature sensor and a flow switch 11. The flow switch 11 is used to collect the flow rate of coolant from the coolant channel of the evaporator 7 to the water tank 13 in the coolant circulation subsystem. The temperature sensor is used to collect the temperature of coolant from the water tank 13 to the water pump 9 in the coolant circulation subsystem. The flow switch 11 and the temperature sensor are electrically connected to the controller 12 for signal transmission. The controller 12 is electrically connected to the compressor 1 in the refrigerant circulation subsystem and the water pump 9 in the coolant circulation subsystem for control.

[0027] The flow switch 11 is installed on the pipeline between the outlet of the evaporator 7 and the inlet of the water tank 13. When the flow switch 11 detects that the flow rate of the coolant meets the set threshold, the controller 12 determines that the working conditions of the refrigerant circulation subsystem are met, thereby avoiding damage to the cooling equipment caused by the refrigerant circulation subsystem malfunctioning when there is no coolant flowing through the evaporator 7.

[0028] A temperature sensor is installed on the outer surface of the water pipe before the water pump 9 to sense the water temperature at the inlet of the water pump 9. When the temperature at the inlet of the water pump 9 sensed by the temperature sensor is higher than the set threshold, the controller 12 determines that the working conditions of the coolant circulation subsystem are met. When the working conditions of the refrigerant circulation subsystem are met, the controller simultaneously controls the refrigerant circulation subsystem and the coolant circulation subsystem to work, continuously cooling the water in the water tank 13 until the temperature of the water in the water tank 13 is reduced to the temperature set by the controller 12.

[0029] The preferred embodiments of this utility model have been described in detail above with reference to the accompanying drawings. These embodiments are merely descriptions of preferred embodiments and are not intended to limit the concept and scope of this utility model. The various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. Such combinations, as long as they do not violate the spirit of this utility model, should also be considered as part of this disclosure. To avoid unnecessary repetition, this utility model will not further describe all possible combinations.

[0030] This utility model is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this utility model and without departing from the design idea of ​​this utility model, all modifications and improvements made by those skilled in the art to the technical solution of this utility model should fall within the protection scope of this utility model. The technical content for which protection is sought in this utility model has been fully recorded in the claims.

Claims

1. An air conditioning system for a medical bed, comprising a refrigerant circulation subsystem and a coolant circulation subsystem located outside the medical bed, wherein heat exchange occurs between the refrigerant in the refrigerant circulation subsystem and the coolant in the coolant circulation subsystem, thereby cooling the coolant in the coolant circulation subsystem, characterized in that, It also includes several air cooling units, each installed in the breathable mattress of the medical bed; each air cooling unit includes a circulating water pump, a fan, a heat exchanger, and a check valve; the circulating water pump in each air cooling unit inputs cooled coolant from the coolant circulation subsystem, and the coolant flows through the heat exchanger and check valve before being returned to the coolant circulation subsystem; the fan in each air cooling unit generates air that passes through the heat exchanger, and the coolant exchanges heat with the air flowing through the heat exchanger to cool the air, and the fan sends the cooled and dehumidified dry air to the holes on the surface of the breathable mattress.

2. The air conditioning system for a medical bed according to claim 1, characterized in that, The refrigerant circulation subsystem includes a compressor (1), a condenser (3) with a condenser fan (2), a liquid receiver (4), a filter (5), a thermostatic expansion valve (6), and an evaporator (7). The evaporator (7) is a plate heat exchanger with a refrigerant flow channel and a coolant flow channel. The refrigerant output from the compressor (1) passes through the refrigerant flow channels in the condenser (3), liquid receiver (4), filter (5), thermostatic expansion valve (6), and evaporator (7) in sequence and then returns to the compressor (1), thereby forming a refrigerant circulation.

3. The air conditioning system for a medical bed according to claim 2, characterized in that, The coolant circulation subsystem includes a water tank (13), a water pump (9), and a coolant flow channel for the evaporator (7) in the refrigerant circulation subsystem. The water pump (9) transports the coolant in the water tank (13) to the coolant flow channel of the evaporator (7). The coolant returns to the water tank (13) after passing through the coolant flow channel of the evaporator (7), thus forming a coolant circulation. The water tank (13) is also connected to the circulating water pump in each air-cooled unit, and the circulating water pump in each air-cooled unit draws coolant from the water tank (13).

4. The air conditioning system for a medical bed according to claim 3, characterized in that, It also includes a controller (12) and an associated temperature sensor and a flow switch (11). The flow switch (11) is used to collect the flow rate of the coolant from the coolant channel of the evaporator (7) to the water tank (13) in the coolant circulation subsystem. The temperature sensor associated with the controller is used to collect the temperature of the coolant from the water tank (13) to the water pump (9) in the coolant circulation subsystem. The flow switch (11) and the temperature sensor are respectively electrically connected to the controller (12) for signal transmission. The controller (12) is electrically connected to the compressor (1) in the refrigerant circulation subsystem for control.

Images