Semiconductor refrigeration type air conditioner for elevator

Abstract

The invention discloses an elevator semiconductor refrigeration type air conditioner which comprises an air supply device, a semiconductor refrigerator, a refrigerant container, a first refrigerant pipeline, a second refrigerant pipeline, a conveying pump, a refrigeration detection control circuit, a main control circuit and a power supply circuit. A refrigerant channel is arranged in the semiconductor refrigerator, the other end of the first refrigerant pipeline is communicated to the input end of the refrigerant channel through a conveying pump, the output end of the refrigerant channel is communicated to one end of the second refrigerant pipeline, and the other end of the second refrigerant pipeline is communicated to the input end of the refrigerant container. The ventilation channel exchanges heat with the middle section of the second refrigerant pipeline; the refrigeration detection control circuit comprises a temperature detection module and a refrigeration power supply module. The elevator semiconductor refrigeration type air conditioner solves the problem that in the prior art, an elevator air conditioner with a reverse condenser connector occupies a large space.

Description

Technical Field

[0001] This invention relates to elevator air conditioning, and more specifically to an elevator semiconductor refrigeration air conditioner. Background Technology

[0002] Chinese patent discloses an elevator air conditioner with a reversed condenser interface, application number CN200620025350.4. This elevator air conditioner with a reversed condenser interface consists of a compressor, a condenser and a condenser fan, a water collection chassis installed at the lower end of the condenser, a capillary tube, an evaporator and an evaporator fan. The inlet end of the condenser is connected to the exhaust port of the compressor, the outlet end of the condenser is connected to the inlet end of the capillary tube, the outlet end of the capillary tube is connected to the inlet end of the evaporator, and the outlet end of the evaporator is connected to the suction port of the compressor. The lowest end of the condenser is the inlet end, and the highest end of the condenser is the outlet end.

[0003] Although the elevator air conditioner with the reversed condenser interface can still cool the air and output it, it still has the following disadvantages: due to the use of compressors, condensers and other cooling components, the compressor size is increased, resulting in the entire elevator air conditioner with the reversed condenser interface occupying a large space. Summary of the Invention

[0004] The present invention provides an elevator semiconductor refrigeration air conditioner, which solves the problem that existing elevator air conditioners with reversed condenser interfaces occupy a large space.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This invention discloses an elevator semiconductor-cooled air conditioner, comprising: an air supply unit, a semiconductor cooler, a refrigerant container, a first refrigerant pipeline, a second refrigerant pipeline, a delivery pump, a refrigeration detection and control circuit, a main control circuit, and a power supply circuit. The refrigerant container is connected to one end of the first refrigerant pipeline. The semiconductor cooler has a refrigerant channel. The other end of the first refrigerant pipeline is connected to the refrigerant channel input end via the delivery pump. The refrigerant channel output end is connected to one end of the second refrigerant pipeline. The other end of the second refrigerant pipeline is connected to the refrigerant container input end. The air supply unit has a ventilation channel, which is connected to the second refrigerant pipeline. Heat exchange occurs in the middle section of the pipeline; the refrigeration detection and control circuit includes a temperature detection module and a refrigeration power supply module. The sensing part of the temperature detection module is located inside the refrigerant channel. The sensing part of the temperature detection module is used to sense the temperature inside the refrigerant channel. The first output terminal of the power supply circuit supplies power to the cooling chip in the semiconductor refrigerator through the refrigeration power supply module. The output terminal of the temperature detection module is connected to the control terminal of the refrigeration power supply module. The temperature detection module is used to sense the temperature inside the refrigerant channel through the sensing part, and when the temperature inside the refrigerant channel reaches the set value, it controls the refrigeration power supply module not to connect the first output terminal of the power supply circuit to the cooling chip in the semiconductor refrigerator.

[0007] Preferably, the elevator semiconductor-cooled air conditioner further includes a cooling / heating mode switching module. The cooling / heating mode switching module includes: a first single-pole double-throw switch, a second single-pole double-throw switch, and an action switching drive unit. The stationary terminal of the first single-pole double-throw switch is connected to the first output terminal of the power supply circuit. The normally closed terminal of the first single-pole double-throw switch is connected to the first end of the cooling element through the cooling power supply module. The normally open terminal of the first single-pole double-throw switch is connected to the second end of the cooling element and the normally closed terminal of the second single-pole double-throw switch. The stationary terminal of the second single-pole double-throw switch is grounded. The normally open terminal of the second single-pole double-throw switch is connected to the normally closed terminal of the first single-pole double-throw switch. The second output terminal of the power supply circuit supplies power to the action switching drive unit through a control switch unit. The action switching drive unit controls the operation of the first single-pole double-throw switch and the second single-pole double-throw switch.

[0008] Preferably, the elevator semiconductor cooling air conditioner further includes: a voltage stabilization indicator module, the first end of which is connected to the normally closed terminal of a first single-pole double-throw switch, and the second end of which is connected to the normally closed terminal of a second single-pole double-throw switch.

[0009] Preferably, the cooling / heating mode switching module further includes: a third single-pole double-throw switch, the action switching drive unit controls the action of the third single-pole double-throw switch; the temperature detection module includes: a cooling temperature detection unit, a heating temperature detection unit, a first comparison unit, a second comparison unit, a first current limiting unit, and a second current limiting unit, the cooling temperature detection unit and the heating temperature detection unit are sensing units, the second output terminal of the power supply circuit is connected to the stationary terminal of the third single-pole double-throw switch, the normally closed terminal of the third single-pole double-throw switch is connected to the power supply terminal of the cooling temperature detection unit, the output terminal of the heating temperature detection unit is connected to the non-inverting input terminal of the first comparison unit, the output terminal of the first comparison unit is connected to the input terminal of the first current limiting unit; the normally open terminal of the third single-pole double-throw switch is connected to the power supply terminal of the heating temperature detection unit, the output terminal of the heating temperature detection unit is connected to the inverting input terminal of the second comparison unit, the output terminal of the second comparison unit is connected to the input terminal of the second current limiting unit, and the output terminals of the first and second current limiting units are connected to form the output terminal of the cooling / heating mode switching module.

[0010] Preferably, the cooling / heating mode switching module further includes: a fourth single-pole double-throw switch and a fifth single-pole double-throw switch, and the action switching drive unit controls the operation of the fourth single-pole double-throw switch and the fifth single-pole double-throw switch; the temperature detection module includes: a cooling / heating temperature detection unit, a third comparison unit, and a reference voltage supply unit, wherein the heating / cooling temperature detection unit is a sensing unit, and the fourth single-pole double-throw switch and the fifth single-pole double-throw switch are installed between the heating / cooling temperature detection unit, the reference voltage supply unit, and the third comparison unit. The fourth single-pole double-throw switch and the fifth single-pole double-throw switch are used to achieve the following: when the action switching drive unit is not powered on, the fourth single-pole double-throw switch and the fifth single-pole double-throw switch connect the output terminal of the heating / cooling temperature detection unit to the inverting input terminal of the third comparison unit, and the output terminal of the reference voltage supply unit connects to the non-inverting input terminal of the third comparison unit; when the action switching drive unit is powered on, the fourth single-pole double-throw switch and the fifth single-pole double-throw switch connect the output terminal of the reference voltage supply unit to the inverting input terminal of the third comparison unit, and the output terminal of the heating / cooling temperature detection unit connects to the non-inverting input terminal of the third comparison unit.

[0011] Preferably, the cooling / heating mode switching module further includes: a normally closed switch, the action switching drive unit controls the normally closed switch to operate, the first end of the normally closed switch is connected to the output terminal of the reference voltage supply unit, and the second end of the normally closed switch is grounded through a load. The normally closed switch is used to connect one end of the load to the output terminal of the reference voltage supply unit and the other end of the load to ground when the action switching drive unit is energized.

[0012] Compared to existing technologies, this invention offers the following advantages: During operation, the delivery pump transports the refrigerant from the refrigerant container to the first refrigerant pipeline, which then transports the refrigerant to the refrigerant channel. The semiconductor refrigerator cools the refrigerant in the refrigerant channel. After cooling, the refrigerant is transported to the second refrigerant pipeline, where it exchanges heat with the air in the ventilation channel of the air supply unit, resulting in the output of cool air. The use of a relatively small semiconductor refrigerator throughout the entire system reduces the overall size of the elevator semiconductor-cooled air conditioner, making it lighter when installed in the elevator car and less burdensome on the elevator car.

[0013] Other advantages, objectives and features of the present invention will become apparent in part from the following description, and in part from those skilled in the art through study and practice of the invention. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the elevator semiconductor cooling air conditioner of the present invention.

[0015] Figure 2 This is a circuit diagram of the temperature detection module and the cooling power supply module when there is a first comparison unit and a second comparison unit.

[0016] Figure 3 This is the circuit diagram for the thermoelectric cooler.

[0017] Figure 4 This is the circuit diagram for the temperature detection module and the cooling power supply module when a third comparison unit is present.

[0018] Reference numerals: 1. Air supply unit; 2. Semiconductor cooler; 3. Refrigerant container; 4. First refrigerant line; 5. Second refrigerant line; 6. Transfer pump. Detailed Implementation

[0019] To make the technical means, creative features, objectives and effects of this invention clearer and easier to understand, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] like Figure 1As shown, this invention discloses an elevator semiconductor-cooled air conditioner, comprising: an air supply unit, a semiconductor cooler, a refrigerant container, a first refrigerant pipeline, a second refrigerant pipeline, a delivery pump, a refrigeration detection and control circuit, a main control circuit, and a power supply circuit. The refrigerant container is connected to one end of the first refrigerant pipeline. A refrigerant channel is provided inside the semiconductor cooler. The other end of the first refrigerant pipeline is connected to the refrigerant channel input end via the delivery pump. The refrigerant channel output end is connected to one end of the second refrigerant pipeline. The other end of the second refrigerant pipeline is connected to the refrigerant container input end. A ventilation channel is provided inside the air supply unit, and the ventilation channel is connected to the second refrigerant pipeline. Heat exchange occurs in the middle section of the pipeline; the refrigeration detection and control circuit includes a temperature detection module and a refrigeration power supply module. The sensing part of the temperature detection module is located inside the refrigerant channel. The sensing part of the temperature detection module is used to sense the temperature inside the refrigerant channel. The first output terminal of the power supply circuit supplies power to the cooling chip in the semiconductor refrigerator through the refrigeration power supply module. The output terminal of the temperature detection module is connected to the control terminal of the refrigeration power supply module. The temperature detection module is used to sense the temperature inside the refrigerant channel through the sensing part, and when the temperature inside the refrigerant channel reaches the set value, it controls the refrigeration power supply module to not connect the first output terminal VCC1 of the power supply circuit to the cooling chip in the semiconductor refrigerator.

[0021] The first output terminal VCC1 of the power supply circuit outputs a 12V voltage, and the second output terminal VCC2 outputs a 5V voltage. The first output terminal VCC1 of the power supply circuit meets the operating voltage requirements of the thermoelectric cooler ZL in the semiconductor cooler.

[0022] In this application, the elevator semiconductor refrigeration air conditioner further includes a cooling and heating mode switching module. The cooling and heating mode switching module includes: a first single-pole double-throw switch, a second single-pole double-throw switch, and an action switching drive unit. The stationary terminal of the first single-pole double-throw switch is connected to the first output terminal VCC1 of the power supply circuit. The normally closed terminal of the first single-pole double-throw switch is connected to the first terminal of the cooling chip ZL through the refrigeration power supply module. The normally open terminal of the first single-pole double-throw switch is connected to the second terminal of the cooling chip ZL and the normally closed terminal of the second single-pole double-throw switch. The stationary terminal of the second single-pole double-throw switch is grounded. The normally open terminal of the second single-pole double-throw switch is connected to the normally closed terminal of the first single-pole double-throw switch. The second output terminal VCC2 of the power supply circuit supplies power to the action switching drive unit through a control switch unit. The action switching drive unit controls the operation of the first single-pole double-throw switch and the second single-pole double-throw switch.

[0023] The function of the cooling / heating mode switching module is to switch between heating and cooling modes. This module can be a large relay containing a first single-pole double-throw switch SW1, a second single-pole double-throw switch SW2, and an operation switching drive unit. When the operation switching drive unit is not energized, the first single-pole double-throw switch SW1 and the second single-pole double-throw switch SW2 connect the first end of the cooling element ZL to the first output terminal VCC1 of the power supply circuit, and the second end of the cooling element ZL is grounded. In this state, the cooling element ZL cools the refrigerant in the refrigerant channel, achieving a cooling effect for the airflow. When the operation switching drive unit is energized, the first single-pole double-throw switch SW1 and the second single-pole double-throw switch SW2 ground the first end of the cooling element ZL, and the second end of the cooling element ZL connects to the first output terminal VCC1 of the power supply circuit. In this state, the cooling element ZL heats the refrigerant in the refrigerant channel, achieving a heating effect for the airflow.

[0024] Each cooling power supply module includes: an NPN transistor Q1, a diode D3, and a relay SW0. The normally closed terminal of the first single-pole double-throw switch SW1 is connected to the first terminal of the cooling chip ZL through the relay SW0 in the cooling power supply module. The positive terminal of the relay SW0 coil and the cathode of the diode D3 are connected to the second output terminal VCC2 of the power supply circuit. The negative terminal of the relay SW0 coil and the anode of the diode D3 are connected to the collector of the NPN transistor Q1. The emitter of the NPN transistor Q1 is grounded, and the base of the NPN transistor Q1 is the control terminal of the cooling power supply module.

[0025] The action switching drive unit is the coil in the cooling / heating mode switching module, while the control switch unit is closed or opened under the control of the main control circuit. The control switch unit is a circuit similar to an NPN transistor Q1 and a diode D3, and the control terminal of the control switch unit is connected to the output terminal of the main control circuit, realizing that the main control circuit controls whether the action switching drive unit is energized by controlling the control switch unit.

[0026] In this application, the elevator semiconductor refrigeration air conditioner further includes: a voltage stabilization indicator module, the first end of which is connected to the normally closed terminal of the first single-pole double-throw switch SW1, and the second end of which is connected to the normally closed terminal of the second single-pole double-throw switch SW2.

[0027] The voltage regulator indicator module includes a resistor R6, a diode D4, and a diode D5. The first terminal of resistor R6 is the first terminal of the voltage regulator indicator module, connected to the anode of diode D4 and the cathode of diode D5. The cathode of diode D4 and the anode of diode D5, when connected together, form the second terminal of the voltage regulator indicator module. The voltage regulator indicator module stabilizes the voltage between the first and second terminals of the cooler ZL. When the first terminal of the cooler ZL is at a high or low voltage, one of diodes D4 and D5 illuminates to indicate whether the cooler ZL is operating normally.

[0028] Since the cooling element ZL has two operating modes, cooling and heating, a cooling / heating mode switching module was designed to ensure that the heating element stops working when the temperature rises to a certain level during heating and stops working when the temperature drops to a certain level during cooling, and to automatically control the cooling element ZL to stop working based on the temperature. The two implementation methods of the cooling / heating mode switching module are described below.

[0029] The first implementation: The cooling / heating mode switching module further includes: a third single-pole double-throw switch SW3, and the action switching drive unit controls the action of the third single-pole double-throw switch SW3; the temperature detection module includes: a cooling temperature detection unit, a heating temperature detection unit, a first comparison unit, a second comparison unit, a first current limiting unit, and a second current limiting unit. The cooling temperature detection unit and the heating temperature detection unit are sensing units. The second output terminal VCC2 of the power supply circuit is connected to the stationary terminal of the third single-pole double-throw switch SW3. The normally closed terminal of the third single-pole double-throw switch SW3 is connected to the power supply terminal of the cooling temperature detection unit. The output terminal of the heating temperature detection unit is connected to the non-inverting input terminal of the first comparison unit. The output terminal of the first comparison unit is connected to the input terminal of the first current limiting unit. The normally open terminal of the third single-pole double-throw switch SW3 is connected to the power supply terminal of the heating temperature detection unit. The output terminal of the heating temperature detection unit is connected to the inverting input terminal of the second comparison unit. The output terminal of the second comparison unit is connected to the input terminal of the second current limiting unit. The output terminals of the first and second current limiting units are connected to form the output terminal of the cooling / heating mode switching module.

[0030] In the first single-pole double-throw (SPL) switch SW1, the second single-pole double-throw (SPL) switch SW2, the third single-pole double-throw (SPL) switch SW3, the fourth single-pole double-throw (SPL) switch, and the fifth single-pole double-throw (SPL) switch, the normally closed terminal refers to the terminal that remains closed with the stationary terminal when the actuation switching drive unit is not energized. In the first single-pole double-throw (SPL) switch SW1, the second single-pole double-throw (SPL) switch SW2, the third single-pole double-throw (SPL) switch SW3, the fourth single-pole double-throw (SPL) switch, and the fifth single-pole double-throw (SPL) switch, the normally open terminal refers to the terminal that remains closed with the stationary terminal when the actuation switching drive unit is energized.

[0031] In cooling mode, the action switching drive is not powered on. At this time, the stationary terminal and the normally closed terminal are closed. The first terminal of the cooling element ZL is connected to the first output terminal VCC1 of the power supply circuit, and the second terminal of the cooling element ZL is grounded. At this time, the power supply terminal of the cooling temperature detection unit is connected to the second output terminal VCC2 of the power supply circuit. The cooling temperature detection unit (the thermistor RT1 in the cooling temperature detection unit and the thermistor in the heating temperature detection unit are both PTC type, and the resistance of RT1 decreases as the temperature decreases) reduces its voltage as the temperature decreases. Initially, the voltage at the inverting input terminal of the first comparator is lower than the output voltage of the cooling temperature detection unit, so the first comparator outputs a high level. The first comparator makes the base of the NPN transistor Q1 high, and the cooling element ZL is always in the cooling working state. As the temperature decreases, the output voltage of the cooling temperature detection unit decreases. When the voltage at the inverting input terminal of the first comparator is higher than the output voltage of the cooling temperature detection unit, the first comparator outputs a low level, the NPN transistor Q1 is turned off, and the cooling element ZL does not work, thus realizing that the cooling element ZL stops working after cooling to a certain temperature. When the refrigerant temperature rises, the cooling element ZL will start working again, thereby reducing energy consumption.

[0032] Similarly, in heating mode, the action switching drive is energized. At this time, the stationary terminal and the normally open terminal are closed, the first terminal of the cooling element ZL is grounded, and the second terminal of the cooling element ZL is connected to the first output terminal VCC1 of the power supply circuit. At this time, the power supply terminal of the heating temperature detection unit is connected to the second output terminal VCC2 of the power supply circuit. The voltage of the heating temperature detection unit (both the thermistors RT1 in the cooling temperature detection unit and the thermistors in the heating temperature detection unit are PTC type, and the resistance of RT1 increases with the temperature) increases with the temperature. Initially, the voltage at the non-inverting input terminal of the first comparator is higher than the output voltage of the heating temperature detection unit, so the first comparator outputs a high level. The first comparator makes the base of the NPN transistor Q1 high, and the cooling element ZL is always in the cooling working state. As the temperature rises, the output voltage of the heating temperature detection unit decreases. When the voltage at the non-inverting input terminal of the first comparator is lower than the output voltage of the heating temperature detection unit, the first comparator outputs a low level, the NPN transistor Q1 is turned off, and the cooling element ZL does not work, thus realizing that the cooling element ZL stops working after cooling to a certain temperature. When the refrigerant temperature drops, the cooling element ZL will start working again, thereby reducing energy consumption.

[0033] Both the cooling temperature detection unit and the heating temperature detection unit include: a resistor R2 and a thermistor RT1. The first terminal of the resistor R2 is the power supply terminal of the respective cooling or heating temperature detection unit, and the second terminal of the resistor R2 is grounded through the thermistor RT1. The second terminal of the resistor R2 is the output terminal of the respective cooling or heating temperature detection unit. The thermistor RT1 is the sensing element.

[0034] Both the first and second comparison units include: a resistor R3, a sliding resistor RV2, and a comparator U3A. The first terminal of resistor R3 is connected to the power supply terminal of the corresponding cooling or heating temperature detection unit. The second terminal of resistor R3 is connected to the first fixed terminal of the sliding resistor RV2. The second fixed terminal of the sliding resistor RV2 is grounded, and the sliding terminal of the sliding resistor RV2 is also grounded. The second terminal of resistor R3 provides a comparison voltage to comparator U3A. The non-inverting input terminal of comparator U3A is the same as the non-inverting input terminal of the corresponding first or second comparison unit. The inverting input terminal of comparator U3A is the same as the inverting input terminal of the corresponding first or second comparison unit. The output terminal of comparator U3A is the same as the output terminal of the corresponding first or second comparison unit.

[0035] Both the first current limiting unit and the second current limiting unit include a diode D1, where the anode of the diode D1 is the input terminal of the first current limiting unit or the second current limiting unit, and the cathode of the diode D1 is the output terminal of the first current limiting unit or the second current limiting unit.

[0036] The second implementation: The cooling mode switching module further includes: a fourth single-pole double-throw switch and a fifth single-pole double-throw switch SW5; the action switching drive unit controls the operation of the fourth single-pole double-throw switch SW4 and the fifth single-pole double-throw switch SW5; the temperature detection module includes: a cooling / heating temperature detection unit, a third comparison unit, and a reference voltage supply unit; the cooling / heating temperature detection unit is a sensing unit; the fourth single-pole double-throw switch SW4 and the fifth single-pole double-throw switch SW5 are installed between the cooling / heating temperature detection unit, the reference voltage supply unit, and the third comparison unit. The fourth single-pole double-throw switch SW4... The fifth single-pole double-throw switch SW5 is used to achieve the following: when the operation switching drive unit is not powered on, the fourth single-pole double-throw switch SW4 and the fifth single-pole double-throw switch SW5 connect the output terminal of the cooling / heating temperature detection unit to the inverting input terminal of the third comparison unit, and connect the output terminal of the reference voltage supply unit to the non-inverting input terminal of the third comparison unit; when the operation switching drive unit is powered on, the fourth single-pole double-throw switch SW4 and the fifth single-pole double-throw switch SW5 connect the output terminal of the reference voltage supply unit to the inverting input terminal of the third comparison unit, and connect the output terminal of the cooling / heating temperature detection unit to the non-inverting input terminal of the third comparison unit.

[0037] The output of the cooling and heating temperature detection unit is connected to the normally closed terminal of the fourth single-pole double-throw switch and the normally open terminal of the fifth single-pole double-throw switch. The output of the reference voltage supply unit is connected to the normally open terminal of the fourth single-pole double-throw switch and the normally closed terminal of the fifth single-pole double-throw switch. The stationary terminal of the fourth single-pole double-throw switch is connected to the non-inverting input terminal of the third comparison unit. The stationary terminal of the fifth single-pole double-throw switch is connected to the inverting input terminal of the third comparison unit. The output of the third comparison unit is the output of the temperature detection module.

[0038] The cooling and heating temperature detection unit includes a resistor R20 and a thermistor RT2. The first end of the resistor R20 is connected to the second output terminal of the power supply, and the second end of the resistor R20 is grounded through the thermistor RT2. The second end of the resistor R20 is the output terminal of the cooling and heating temperature detection unit.

[0039] The reference voltage providing unit includes: a resistor R1 and a sliding resistor RV1. The first end of the resistor R1 is connected to the second output terminal of the power supply, the second end of the resistor R1 is connected to the first fixed end of the sliding resistor RV1, the second fixed end of the sliding resistor RV1 is grounded, the sliding end of the sliding resistor RV1 is grounded, and the second end of the resistor R1 is the output terminal of the reference voltage providing unit.

[0040] The third comparison unit includes: comparator U3B, the non-inverting input of comparator U3B is the non-inverting input of the third comparison unit, the inverting input of comparator U3B is the inverting input of the third comparison unit, and the output of comparator U3B is the output of the third comparison unit.

[0041] During cooling operation, the action switching drive unit is not powered on. The normally closed terminal and the stationary terminal of the fourth single-pole double-throw switch SW4 are closed, and the normally closed terminal and the stationary terminal of the fifth single-pole double-throw switch SW5 are closed. At this time, the output terminal of the cooling and heating temperature detection unit is connected to the non-inverting input terminal of the third comparison unit, and the output terminal of the reference voltage supply unit is connected to the inverting input terminal of the third comparison unit. Under normal circumstances, the thermistor RT2 (a PTC thermistor) has a relatively high resistance. The output voltage of the cooling / heating temperature detection unit is higher than the comparison voltage provided by the reference voltage provider. The third comparison unit outputs a high level, and the coil of relay SW0 in the cooling power supply module is normally powered. Relay SW0 in the cooling power supply module connects the power supply to the cooling element ZL, enabling it to perform cooling operations. As the cooling operation time increases and the temperature decreases, the resistance of the thermistor RT2 in the cooling / heating temperature detection unit decreases, and the output voltage of the cooling / heating temperature detection unit decreases. When the temperature drops to its lowest point, the output of the cooling / heating temperature detection unit is less than the comparison voltage provided by the reference voltage provider. The third comparison unit outputs a low level, the coil of relay SW0 in the cooling power supply module is not powered, and relay SW0 in the cooling power supply module de-energizes the cooling element ZL, stopping the cooling operation.

[0042] When heating is in operation, the action switching drive unit is powered on, the normally open terminal and the stationary terminal of the fourth single-pole double-throw switch SW4 are closed, and the normally open terminal and the stationary terminal of the fifth single-pole double-throw switch SW5 are closed. At this time, the output terminal of the cooling and heating temperature detection unit is connected to the inverting input terminal of the third comparison unit, and the output terminal of the reference voltage supply unit is connected to the non-inverting input terminal of the third comparison unit. Under normal circumstances, the thermistor RT2 (a PTC thermistor) has a low resistance. The output voltage of the heating temperature detection unit is lower than the comparison voltage provided by the reference voltage provider. The third comparison unit outputs a high level, and the coil of relay SW0 in the heating power supply module is normally powered. Relay SW0 in the heating power supply module connects the cooling element ZL to the power supply, enabling it to perform heating. As the heating operation time increases and the temperature rises, the resistance of the thermistor RT2 in the heating temperature detection unit increases, and the output voltage of the heating temperature detection unit increases. When the temperature rises to the highest point, the output of the heating temperature detection unit is greater than the comparison voltage provided by the reference voltage provider. The third comparison unit outputs a low level, the coil of relay SW0 in the heating power supply module is not powered, and relay SW0 in the heating power supply module de-connects the power supply to the cooling element ZL, stopping the heating operation.

[0043] The heating mode switching module also includes: a normally closed switch SW6, which is controlled by the action switching drive unit. The first end of the normally closed switch SW6 is connected to the output end of the reference voltage supply unit, and the second end of the normally closed switch SW6 is grounded through a load R8. The normally closed switch SW6 is used to connect one end of the load to the output end of the reference voltage supply unit and the other end of the load R8 to the ground when the action switching drive unit is energized.

[0044] Since the comparison voltage provided at the second terminal of resistor R1 in heating mode should be higher than that in cooling mode, a normally closed switch SW6 was designed to achieve the following functions: When cooling, the actuation switching drive is not energized, and normally closed switch SW6 closes, causing load R8 to be connected in parallel with sliding resistor RV1, resulting in a lower comparison voltage provided at the second terminal of resistor R1. When heating, the actuation switching drive is energized, and normally closed switch SW6 opens, causing load R8 to be disconnected and not connected in parallel with sliding resistor RV1, resulting in a higher comparison voltage provided at the second terminal of resistor R1.

[0045] The first single-pole double-throw switch SW1, the second single-pole double-throw switch SW2, the third single-pole double-throw switch SW3, the fourth single-pole double-throw switch SW4, the fifth single-pole double-throw switch SW5, the normally closed switch SW6, and the operation switching drive are all located in one relay. Therefore, the operation switching drive can simultaneously control the operation of the first single-pole double-throw switch SW1, the second single-pole double-throw switch SW2, the third single-pole double-throw switch SW3, the fourth single-pole double-throw switch SW4, the fifth single-pole double-throw switch SW5, and the normally closed switch SW6.

[0046] Compared with the first implementation, the second implementation reduces the use of the comparison unit and the reference voltage providing unit, and increases the use of switches. The cost of the switches is low, thereby greatly reducing the cost.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An elevator semiconductor-cooled air conditioner, characterized in that, include: The system includes an air supply unit, a semiconductor refrigerator, a refrigerant container, a first refrigerant pipeline, a second refrigerant pipeline, a delivery pump, a refrigeration detection and control circuit, a main control circuit, and a power supply circuit. The refrigerant container is connected to one end of the first refrigerant pipeline. The semiconductor refrigerator has a refrigerant channel. The other end of the first refrigerant pipeline is connected to the refrigerant channel input end through the delivery pump. The refrigerant channel output end is connected to one end of the second refrigerant pipeline. The other end of the second refrigerant pipeline is connected to the refrigerant container input end. The air supply unit has a ventilation channel, which exchanges heat with the middle section of the second refrigerant pipeline. The refrigeration detection and control circuit includes a temperature detection module and a refrigeration power supply module. The sensing part of the temperature detection module is located in the refrigerant channel and is used to sense the temperature in the refrigerant channel. The first output terminal of the power supply circuit supplies power to the cooling chip in the semiconductor refrigerator through the refrigeration power supply module. The output terminal of the temperature detection module is connected to the control terminal of the refrigeration power supply module. The temperature detection module is used to sense the temperature in the refrigerant channel through the sensing part and, when the temperature in the refrigerant channel reaches a set value, controls the refrigeration power supply module to not connect the first output terminal of the power supply circuit to the cooling chip in the semiconductor refrigerator.

2. The elevator semiconductor refrigeration air conditioner according to claim 1, characterized in that, It also includes a cooling / heating mode switching module, which includes: a first single-pole double-throw switch, a second single-pole double-throw switch, and an action switching drive unit. The stationary terminal of the first single-pole double-throw switch is connected to the first output terminal of the power supply circuit. The normally closed terminal of the first single-pole double-throw switch is connected to the first end of the cooling chip through the cooling power supply module. The normally open terminal of the first single-pole double-throw switch is connected to the second end of the cooling chip and the normally closed terminal of the second single-pole double-throw switch. The stationary terminal of the second single-pole double-throw switch is grounded. The normally open terminal of the second single-pole double-throw switch is connected to the normally closed terminal of the first single-pole double-throw switch. The second output terminal of the power supply circuit supplies power to the action switching drive unit through a control switch unit. The action switching drive unit controls the operation of the first single-pole double-throw switch and the second single-pole double-throw switch.

3. The elevator semiconductor refrigeration air conditioner according to claim 2, characterized in that, Also includes: The voltage regulator indicator module has its first end connected to the normally closed terminal of the first single-pole double-throw switch, and its second end connected to the normally closed terminal of the second single-pole double-throw switch.

4. The elevator semiconductor refrigeration air conditioner according to claim 2 or 3, characterized in that, The cooling and heating mode switching module also includes: a third single-pole double-throw switch, and the action switching drive unit controls the action of the third single-pole double-throw switch; The temperature detection module includes: a cooling temperature detection unit, a heating temperature detection unit, a first comparison unit, a second comparison unit, a first current limiting unit, and a second current limiting unit. The cooling temperature detection unit and the heating temperature detection unit are sensing units. The second output terminal of the power supply circuit is connected to the stationary terminal of a third single-pole double-throw switch. The normally closed terminal of the third single-pole double-throw switch is connected to the power supply terminal of the cooling temperature detection unit. The output terminal of the heating temperature detection unit is connected to the non-inverting input terminal of the first comparison unit. The output terminal of the first comparison unit is connected to the input terminal of the first current limiting unit. The normally open terminal of the third single-pole double-throw switch is connected to the power supply terminal of the heating temperature detection unit. The output terminal of the heating temperature detection unit is connected to the inverting input terminal of the second comparison unit. The output terminal of the second comparison unit is connected to the input terminal of the second current limiting unit. The output terminals of the first and second current limiting units are connected to form the output terminal of the cooling / heating mode switching module.

5. The elevator semiconductor refrigeration air conditioner according to claim 2 or 3, characterized in that, The cooling and heating mode switching module also includes: a fourth single-pole double-throw switch and a fifth single-pole double-throw switch, and the action switching drive unit controls the action of the fourth single-pole double-throw switch and the fifth single-pole double-throw switch; The temperature detection module includes: a cooling / heating temperature detection unit, a third comparison unit, and a reference voltage supply unit. The cooling / heating temperature detection unit is a sensing unit. A fourth single-pole double-throw switch and a fifth single-pole double-throw switch are installed between the cooling / heating temperature detection unit, the reference voltage supply unit, and the third comparison unit. The fourth and fifth single-pole double-throw switches are used to: when the operation switching drive unit is not powered on, the fourth and fifth single-pole double-throw switches connect the output terminal of the cooling / heating temperature detection unit to the inverting input terminal of the third comparison unit, and connect the output terminal of the reference voltage supply unit to the non-inverting input terminal of the third comparison unit; when the operation switching drive unit is powered on, the fourth and fifth single-pole double-throw switches connect the output terminal of the reference voltage supply unit to the inverting input terminal of the third comparison unit, and connect the output terminal of the cooling / heating temperature detection unit to the non-inverting input terminal of the third comparison unit.

6. The elevator semiconductor refrigeration air conditioner according to claim 5, characterized in that, The cooling / heating mode switching module also includes: a normally closed switch, the action switching drive unit controls the normally closed switch to operate, the first end of the normally closed switch is connected to the output terminal of the reference voltage supply unit, and the second end of the normally closed switch is grounded through a load. The normally closed switch is used to connect one end of the load to the output terminal of the reference voltage supply unit and the other end of the load to ground when the action switching drive unit is energized.

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