Cold compress machine capable of controlling flow speed according to inlet liquid temperature and cold compress machine control circuit

Abstract

The utility model discloses a cold compress machine capable of controlling flow speed according to inlet liquid temperature and a cold compress machine control circuit. The cold compress machine is provided with a heat preservation box for storing a cold source, a cold compress pad, a pump body arranged in the heat preservation box and used for pumping out cold liquid in the heat preservation box, and a liquid outlet pipe communicated between the heat preservation box and the cold compress pad and used for conveying the cold liquid output from the heat preservation box to the cold compress pad. The backflow pipe is communicated between the cold compress pad and the heat preservation box and used for enabling cold liquid output by the cold compress pad to flow back to the heat preservation box, and the pump body is communicated with the liquid outlet pipe; the control circuit is provided with a temperature measuring module used for collecting the temperature of cold liquid flowing back to the heat preservation box from the cold compress pad, a pump body control module used for controlling the flow speed of the cold liquid so as to control the temperature of the cold compress pad, and a main control module used for operating pump body power according to the temperature of the cold liquid. The cold compress machine can detect the temperature of cold liquid flowing back to the heat preservation box from the cold compress pad and control the flow speed of the cold liquid according to the temperature of the cold liquid, and therefore temperature control over the cold compress pad is achieved.

Description

Technical Field

[0001] This invention relates to the field of cold compress technology, and in particular to a cold compress machine and a cold compress machine control circuit that controls the flow rate according to the inlet liquid temperature. Background Technology

[0002] Cold compresses involve applying ice packs or cold, damp towels to the skin of the forehead, back of the neck, or affected areas to constrict local blood vessels, control bleeding from small blood vessels, and reduce pain from tense lumps, thus reducing swelling and pain. For patients with high fever, cold compresses to the forehead and back of the neck can lower body temperature and alleviate discomfort. With technological advancements, various cold compress machines have emerged, gradually replacing traditional ice packs or cold, damp towels. For example, a circulating cold compress device is disclosed in Chinese Patent Publication No. CN219397850U.

[0003] Current cold compress machines simply deliver ice water from the machine to the cold compress pad. Since the cold compress pad needs to exchange heat with the area being used, current cold compress machines cannot monitor or control the temperature of the cold compress pad, resulting in poor cold compress effects.

[0004] Therefore, in view of the shortcomings of the existing technology, it is necessary to provide a cold compress machine and a cold compress machine control circuit that control the flow rate according to the inlet liquid temperature to solve the shortcomings of the existing technology. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a cold compress machine that controls the flow rate based on the inlet liquid temperature. This cold compress machine can detect the temperature of the cold liquid flowing back into the insulation box from the cold compress pad and control the flow rate of the cold liquid according to the cold liquid temperature, thereby achieving temperature control of the cold compress pad.

[0006] The above-mentioned objectives of this utility model are achieved through the following technical measures:

[0007] A cold compress machine is provided that controls the flow rate according to the inlet liquid temperature. It is equipped with an insulated box for storing cold source, a cold compress pad, a pump body disposed in the insulated box for pumping out the cold liquid in the insulated box, an outlet pipe connected between the insulated box and the cold compress pad for conveying the cold liquid output from the insulated box to the cold compress pad, a return pipe connected between the cold compress pad and the insulated box for returning the cold liquid output from the cold compress pad to the insulated box, and a control circuit. The pump body is connected to the outlet pipe.

[0008] The control circuit includes a temperature measuring module for collecting the temperature of the cold liquid flowing back from the cold compress to the insulation box, a pump control module for controlling the flow rate of the cold liquid to control the temperature of the cold compress, and a main control module for operating the pump power according to the cold liquid temperature. The temperature measuring module and the pump control module are respectively connected to the main control module.

[0009] The temperature measuring module is located inside the return pipe, and the pump control module controls the pump.

[0010] Preferably, the detection unit of the temperature measurement module is located inside the return pipe.

[0011] Preferably, the reflux pipe is provided with a first one-way valve inserted into the wall of the insulation box, and the detection unit is located inside the first one-way valve.

[0012] Preferably, the liquid outlet pipe is equipped with a second one-way valve that is inserted into the wall of the insulated box.

[0013] Preferably, the temperature measurement module is provided with a resistor R15, a thermistor R20 as a detection unit, and a capacitor C7. One end of the resistor R15 is connected to the VCC power supply terminal, the other end of the resistor R15 is connected in series with the capacitor C7 and grounded, the other end of the resistor R15 is connected in series with the thermistor R20 and grounded, and the other end of the resistor R15 is also connected to the main control module.

[0014] Preferably, the thermistor R20 is disposed inside the first one-way valve.

[0015] Preferably, the pump control module is equipped with a field-effect transistor Q1, resistors R9, R10, R16, and R17. The gate (G) terminal of the field-effect transistor Q1 is connected in series with one end of resistor R9, and the other end of resistor R9 is connected to the main control module. The gate (G) terminal of the field-effect transistor Q1 is connected to one end of resistor R10, and the other end of resistor R10 is connected in series with one end of resistor R16. The other end of resistor R16 is connected to the main control module, and the other end of resistor R10 is connected in series with resistor R17 and grounded. The other end of resistor R10 is connected to the source (S) terminal of the field-effect transistor Q1, and the drain (D) terminal of the field-effect transistor Q1 is connected to the external pump body.

[0016] Preferably, the main control module is equipped with a chip U5, a capacitor C6, and an interface TP1 for programming the working mode. Pin 1 of chip U5 is connected to ground in series with capacitor C6. Pin 1 of chip U5 is connected to the VCC power supply terminal. Pin 6 of pin 1 of chip U5 is connected to the other end of resistor R15. Pin 7 of chip U5 is connected to the other end of resistor R9. Pin 15 of chip U5 is connected to the other end of resistor R16. Pin 1 of interface TP1 is connected to the VCC power supply terminal. Pin 2 of interface TP1 is connected to pin 3 of chip U5. Pin 3 of interface TP1 is connected to pin 2 of chip U5. Pin 4 of interface TP1 is grounded.

[0017] The control circuit also includes a button module, a temperature timing display module, and a function light display module, all of which are connected to the main control module.

[0018] Preferably, the above-mentioned button module is provided with resistors R1, R3, R4, R5, and R6, capacitor C1, and buttons S1, S2, S3, S4, and S5. One end of resistor R1 is connected to the VCC power supply terminal, and the other end of resistor R1 is connected to pin 8 of chip U5. The other end of resistor R1 is connected in series with capacitor C1 and grounded. The other end of resistor R1 is connected in series with button S1 and grounded. The other end of resistor R1 is connected in series with resistor R3 and button S2 and grounded. The other end of resistor R1 is connected in series with resistor R4 and button S3 and grounded. The other end of resistor R1 is connected in series with resistor R5 and button S4 and grounded. The other end of resistor R1 is connected in series with resistor R6 and button S5 and grounded.

[0019] Preferably, the temperature timing display module is equipped with LEDs D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25, D26, and [other LEDs]. Diodes D27, D28, D29, D30, D31, D32, D33, D34, and D35; the anodes of D1, D7, D6, D5, D2, D3, and D4 are connected to pin 12 of chip U3. The cathode of D1 is connected to pin 11 of chip U3. The cathode of D7 is connected to pin 4 of chip U3. The cathode of D2 is connected to pin 10 of chip U3. The cathode of D3 is connected to the chip... Pin 14 of chip U3 is connected; the negative terminal of LED D6 is connected to pin 9 of chip U3; the negative terminal of LED D5 is connected to pin 5 of chip U3; the positive terminals of LEDs D8, D14, D9, D10, D11, D13, and D12 are connected to pin 11 of chip U3; the negative terminal of LED D8 is connected to pin 12 of chip U3; the negative terminal of LED D14 is connected to pin 4 of chip U3; the negative terminal of LED D9 is connected to pin 10 of chip U3; the negative terminal of LED D10 is connected to pin 14 of chip U3; and the negative terminal of LED D11... The negative terminal of LED D13 is connected to pin 13 of chip U3. The negative terminal of LED D13 is connected to pin 9 of chip U3. The negative terminal of LED D12 is connected to pin 5 of chip U3. The positive terminals of LEDs D15, D21, D16, D17, D18, D20, and D19 are connected to pin 10 of chip U3. The negative terminal of LED D15 is connected to pin 12 of chip U3. The negative terminal of LED D21 is connected to pin 4 of chip U3. The negative terminal of LED D16 is connected to pin 11 of chip U3. The negative terminal of LED D17 is connected to pin 14 of chip U3.The cathode of LED D18 is connected to pin 13 of chip U3; the cathode of LED D20 is connected to pin 9 of chip U3; the cathode of LED D19 is connected to pin 5 of chip U3; the anodes of LEDs D22, D28, D23, D24, D25, D27, and D26 are each connected to pin 13 of chip U3; the cathode of LED D22 is connected to pin 12 of chip U3; the cathode of LED D28 is connected to pin 4 of chip U3; the cathode of LED D23 is connected to pin 11 of chip U3; the cathode of LED D24 is connected to pin 14 of chip U3; and the cathode of LED D25 is connected to pin 10 of chip U3. The cathode of LED D27 is connected to pin 9 of chip U3; the cathode of LED D26 is connected to pin 5 of chip U3; the anodes of LEDs D29, D35, D30, D31, D32, D33, and D34 are each connected to pin 5 of chip U3; the cathode of LED D29 is connected to pin 12 of chip U3; the cathode of LED D30 is connected to pin 11 of chip U3; the cathode of LED D31 is connected to pin 14 of chip U3; the cathode of LED D32 is connected to pin 13 of chip U3; the cathode of LED D34 is connected to pin 9 of chip U3; and the cathode of LED D33 is connected to pin 10 of chip U3.

[0020] Preferably, the above-mentioned functional light display module is provided with LEDs D44, D45, D46, D47, D48, and D49. The positive terminal of LED D44 is connected to pin 12 of chip U3, the positive terminal of LED D45 is connected to pin 11 of chip U3, the positive terminal of LED D46 is connected to pin 10 of chip U3, the positive terminal of LED D47 is connected to pin 13 of chip U3, the positive terminal of LED D48 is connected to pin 5 of chip U3, the positive terminal of LED D49 is connected to pin 9 of chip U3, and the negative terminals of LEDs D44, D45, D46, D47, D48, and D49 are connected to pin 4 of chip U3.

[0021] Preferably, the control circuit further includes a power supply module for supplying power to the main control module. The power supply module includes a chip U2, a resistor R7, a coupling capacitor C2, a capacitor C3, a coupling capacitor C4, and a capacitor C5. Pin 1 of the chip U2 is connected to the positive terminal of the coupling capacitor C2, and the negative terminal of the coupling capacitor C2 is grounded. Pin 1 of the chip U2 is connected in series with the resistor R7 and is connected to the VCC 12V power supply terminal. Pin 2 of the chip U2 is grounded. Pin 3 of the chip U2 is connected to the positive terminal of the coupling capacitor C4, and the negative terminal of the coupling capacitor C4 is grounded. Pin 3 of the chip U2 is connected in series with the capacitor C5 and is grounded. Pin 3 of the chip U2 is connected to the VCC power supply terminal.

[0022] Preferably, the main control module has an overheating and ice-adding mode, a countdown mode, a cycle mode, and a perpetual non-stop mode.

[0023] The second objective of this invention is to overcome the shortcomings of existing technologies by providing a cold compress machine control circuit that controls the flow rate of the cold liquid based on temperature. This control circuit can detect the temperature of the cold liquid flowing back into the insulation box from the cold compress pad and control the flow rate of the cold liquid based on the temperature, thereby achieving temperature control of the cold compress pad.

[0024] The above-mentioned objectives of this utility model are achieved through the following technical measures:

[0025] A control circuit for a cold compress machine that controls the flow rate of cold liquid based on temperature is provided, which is the control circuit in the aforementioned cold compress machine that controls the flow rate based on the inlet liquid temperature.

[0026] This utility model discloses a cold compress machine and its control circuit that control the flow rate based on the inlet liquid temperature. The cold compress machine includes an insulated box for storing a cold source, a cold compress pad, a pump body located inside the insulated box to pump out the cold liquid from the insulated box, an outlet pipe connecting the insulated box and the cold compress pad for conveying the cold liquid from the insulated box to the cold compress pad, a return pipe connecting the cold compress pad and the insulated box for returning the cold liquid from the cold compress pad to the insulated box, and a control circuit. The pump body is connected to the outlet pipe. The control circuit includes a temperature measuring module for collecting the temperature of the cold liquid returning from the cold compress pad to the insulated box, a pump body control module for controlling the flow rate of the cold liquid to control the temperature of the cold compress pad, and a main control module for operating the pump body power according to the cold liquid temperature. The temperature measuring module and the pump body control module are respectively connected to the main control module. The temperature measuring module is located inside the return pipe, and the pump body control module controls the pump body. This invention can detect the temperature of the cold liquid flowing back to the insulation box from the cold compress pad, and control the flow rate of the cold liquid according to the cold liquid temperature, thereby achieving temperature control of the cold compress pad. Attached Figure Description

[0027] The present invention will be further described with reference to the accompanying drawings, but the content of the drawings does not constitute any limitation on the present invention.

[0028] Figure 1 This is a schematic diagram of the cold compress machine.

[0029] Figure 2 for Figure 1 A partial schematic diagram of the insulated box.

[0030] Figure 3 for Figure 2 Another perspective diagram.

[0031] Figure 4 Figure 3 A cross-sectional view of “AA”.

[0032] Figure 5 This is the circuit diagram of the temperature measurement module.

[0033] Figure 6 This is the circuit diagram of the pump control module.

[0034] Figure 7 This is the circuit diagram of the main control module.

[0035] Figure 8 This is the circuit diagram for the button module.

[0036] Figure 9 The circuit diagram for the temperature timing display module.

[0037] Figure 10 This is the circuit diagram for the function light display module.

[0038] Figure 11 This is the circuit diagram for the power supply module.

[0039] Figure 12 for Figure 1 An enlarged schematic diagram of the controller.

[0040] exist Figures 1 to 12 This includes:

[0041] Reflux pipe 100, first check valve 110,

[0042] Discharge pipe 200, second check valve 210,

[0043] Detection unit 300, insulation box 400, cold compress pad 500, controller 600. Detailed Implementation

[0044] The technical solution of this utility model will be further explained with reference to the following embodiments.

[0045] Example 1

[0046] A cold compress machine that controls the flow rate based on the inlet liquid temperature, such as Figures 1-4As shown, the system includes an insulated box 400 for storing a cold source, a cold compress pad 500, a pump body disposed inside the insulated box 400 for pumping out the cold liquid from the insulated box, an outlet pipe connected between the insulated box 400 and the cold compress pad 500 for conveying the cold liquid output from the insulated box to the cold compress pad 500, a return pipe 100 connected between the cold compress pad 500 and the insulated box 400 for returning the cold liquid output from the cold compress pad 500 to the insulated box 400, and a control circuit. The pump body is connected to the outlet pipe 200.

[0047] The control circuit includes a temperature measuring module for collecting the temperature of the cold liquid flowing back from the cold compress pad to the insulation box 400, a pump control module for controlling the flow rate of the cold liquid to control the temperature of the cold compress pad 500, and a main control module for operating the pump power according to the cold liquid temperature. The temperature measuring module and the pump control module are respectively connected to the main control module; the temperature measuring module is located inside the return pipe, and the pump control module controls the pump. Figure 1 The control circuit is located inside the controller 600.

[0048] It should be noted that, unlike current cold compress machines with a fixed pump frequency, the temperature control logic of this invention is as follows: the temperature measuring module detects the temperature of the cold liquid returning from the cold compress pad to the 400°C insulated box, and the pump control module then changes the duty cycle to adjust the pump flow rate. The main control module of this invention can also be equipped with multiple operating modes, such as overheating and ice-adding mode, circulation mode, countdown mode, and continuous operation mode, to control the cold compress time and temperature.

[0049] The temperature measuring module is located inside the return pipe 100, and the pump body is connected to the pump body control module. The detection unit 300 of the temperature measuring module is located inside the return pipe 100.

[0050] The return pipe 100 is equipped with a first one-way valve 110 inserted into the wall of the insulation box 400, and the detection unit is located inside the first one-way valve 110. The outlet pipe 200 is equipped with a second one-way valve 210 inserted into the wall of the insulation box 400.

[0051] It should be noted that the insulated box 400, cold compress pad 500, and pump body are not the focus of this invention, and they are already widely used in the field of cold compress machines, so they will not be described in detail here. The cold liquid in this invention is a low-temperature liquid, such as ice water, low-temperature refrigerant, etc. In this embodiment, the cold liquid is specifically ice water. The function of the insulated box 400 is to store the cold source and keep it warm. The insulated box 400 can store ice cubes and a certain proportion of water mixture, ice boxes and a certain proportion of water, frozen water bottles and a certain proportion of water, or freezing liquid, etc. The function of the cold source is to exchange heat with the contact area to achieve therapeutic or protective effects, such as controlling bleeding from small blood vessels, reducing pain from tense lumps, lowering body temperature, and improving discomfort, etc. The cold compress pad 500 of this invention can also be a cold compress bag, cold compress pad, etc. The function of the cold compress pad 500 is to cover the affected area and increase the contact area, and then heat exchange occurs between the cold liquid inside the cold compress pad 500 and the affected area. The detection unit, located inside the first one-way valve 110, improves the accuracy of the cold liquid backflow of the cold compress pad and also reduces the connection difficulty between the temperature measurement module and the main control module. The function of the first one-way valve 110 is to prevent the cold liquid from flowing back from the insulation box 400 to the cold compress pad 500, and the function of the second one-way valve 210 is to prevent the cold liquid from flowing back from the cold compress pad 500 to the insulation box 400.

[0052] like Figure 5 As shown, the temperature measurement module includes a resistor R15, a thermistor R20 (serving as the detection unit 300), and a capacitor C7. One end of the resistor R15 is connected to the VCC power supply terminal, and the other end of the resistor R15 is connected in series with the capacitor C7 and grounded. The other end of the resistor R15 is also connected in series with the thermistor R20 and grounded. The other end of the resistor R15 is also connected to the main control module. The thermistor R20 is located inside the first one-way valve 110, thus accurately reflecting the temperature when the cold compress returns to the insulation box 400.

[0053] like Figure 6 As shown, the pump control module is equipped with a field-effect transistor Q1, resistors R9, R10, R16, and R17. The gate (G) terminal of the field-effect transistor Q1 is connected in series with one end of resistor R9, and the other end of resistor R9 is connected to the main control module. The gate (G) terminal of the field-effect transistor Q1 is connected to one end of resistor R10, and the other end of resistor R10 is connected in series with one end of resistor R16. The other end of resistor R16 is connected to the main control module. The other end of resistor R10 is connected in series with resistor R17 and grounded. The other end of resistor R10 is connected to the source (S) terminal of the field-effect transistor Q1, and the drain (D) terminal of the field-effect transistor Q1 is connected to the external pump body.

[0054] like Figure 7As shown, the main control module is equipped with chip U5, capacitor C6, and interface TP1 for programming the working mode of the cold compress machine. Pin 1 of chip U5 is connected to ground in series with capacitor C6. Pin 1 of chip U5 is connected to the VCC power supply terminal. Pin 6 of pin 1 of chip U5 is connected to the other end of resistor R15. Pin 7 of chip U5 is connected to the other end of resistor R9. Pin 15 of chip U5 is connected to the other end of resistor R16. Pin 1 of interface TP1 is connected to the VCC power supply terminal. Pin 2 of interface TP1 is connected to pin 3 of chip U5. Pin 3 of interface TP1 is connected to pin 2 of chip U5. Pin 4 of interface TP1 is grounded.

[0055] It should be noted that the main control module of this utility model programs the working mode into the chip U5 through interface TP1.

[0056] The control circuit of this utility model also includes a button module, a temperature timing display module, and a function light display module, all of which are connected to the main control module.

[0057] like Figure 8 As shown, the button module includes resistors R1, R3, R4, R5, and R6, capacitor C1, and buttons S1, S2, S3, S4, and S5. One end of resistor R1 is connected to the VCC power supply terminal, and the other end of resistor R1 is connected to pin 8 of chip U5. The other end of resistor R1 is connected in series with capacitor C1 and grounded. The other end of resistor R1 is connected in series with button S1 and grounded. The other end of resistor R1 is connected in series with resistor R3 and button S2 and grounded. The other end of resistor R1 is connected in series with resistor R4 and button S3 and grounded. The other end of resistor R1 is connected in series with resistor R5 and button S4 and grounded. The other end of resistor R1 is connected in series with resistor R6 and button S5 and grounded.

[0058] This invention allows different operating modes to be programmed into the chip U5 via interface TP1, thereby enabling the entire cold compress machine control circuit or the cold compress machine to have different operating modes to meet different usage needs.

[0059] These operating modes include overheating and ice-adding mode, countdown mode, alternating mode, and continuous operation mode. In overheating and ice-adding mode, the temperature timer display indicates that the ice has melted, prompting the user to add more ice. Countdown mode starts a countdown after the set ice application time and stops after the set time. Alternating mode allows users to alternate between ice application and rest periods. The continuous operation mode allows for continuous ice application at the selected temperature setting without interruption.

[0060] The button module can be adjusted as follows:

[0061] 1. TIME_OFF Adjustment: It can be adjusted by adding or subtracting minutes, with an adjustment range of 00-->95 minutes, in 5-minute increments. When TIME_ON is 00, the TIME_OFF button is disabled and does not respond to user operations. The TIME_OFF button will only be enabled again when TIME_ON is not 00.

[0062] 2. TIME_ON Adjustment: It can be adjusted by adding or subtracting minutes, with an adjustment range of 00-->95 minutes, in 5-minute increments.

[0063] 3. Temperature adjustment: 39-43-47-51-55℉ --> Circulation.

[0064] II. Determining the Working Mode of the Main Control Module

[0065] 1. Perpetual non-stop mode

[0066] The "Never Stop" mode means that the selected ice temperature setting will continuously apply ice without interruption. To set the "Never Stop" mode, set TIME_ON to 00, and regardless of the current value of TIME_OFF, the system will enter "Never Stop" mode.

[0067] 2. Countdown Mode

[0068] The countdown mode refers to the function setting used for a single ice application. The countdown mode is set by setting TIME_ON to the single ice application time, ensuring that TIME_ON is not 00 (TIME_ON can be 5-95 minutes), and setting TIME_OFF to 00 to enter countdown mode. During this time, the pump works. When the countdown ends, the control circuit shuts down, and the pump stops working.

[0069] 3. Alternating work mode

[0070] Alternating operating mode refers to the mode used when ice application time and rest time are required. The method for setting alternating operating mode is as follows: TIME_ON is a freely selectable time setting of 5-95 minutes; TIME_OFF is the rest time setting, also freely selectable of 5-95 minutes. In alternating operating mode, the pump will operate during the TIME_ON countdown. When the TIME_ON countdown ends, the TIME_OFF countdown begins, and the pump stops operating. The cycle repeats until the TIME_OFF countdown ends and then the TIME_ON countdown begins again. For example, if ice application is performed every 20 minutes with a 15-minute interval, then TIME_ON is set to 20 minutes and TIME_OFF to 15 minutes. In alternating operating mode, the pump will operate during the 20-minute TIME_ON countdown; after the 20 minutes, the TIME_OFF countdown begins, and the pump stops operating during the 15-minute TIME_OFF countdown.

[0071] 4. Overheating and Ice Addition Mode

[0072] The overheating and ice-adding mode means that when the temperature of the cold source in the insulated box reaches the set temperature, such as 15 degrees, the controller displays H1 and flashes, indicating that the ice has melted and reminding the user to add ice.

[0073] Note: In countdown mode, cycle mode, and continuous operation mode, the control circuit of the cooling pad continuously compares the temperature of the NTC sensor with the set temperature. When the temperature is greater than or equal to the set temperature, the PWM duty cycle is 100%, the field-effect transistor Q1 is turned on, and the pump runs at full speed. When the temperature is less than the set temperature, the PWM duty cycle is 0%, the field-effect transistor Q1 is turned off, and the pump stops, thus controlling the temperature. If the motor does not restart within two minutes after reaching the temperature control point in countdown mode, cycle mode, or continuous operation mode, the pump will perform a 7-second impact. Calculations show that this 7-second impact can force the water in the pad into the NTC's temperature sensor port, preventing a temperature discrepancy between the cooling pad and the NTC sensor after reaching the temperature control point.

[0074] III. Temperature and Pump Body Error Detection

[0075] 1. Pump body inspection

[0076] The principle of prioritizing thermal testing means that the pump body will only be tested if the thermal sensor is functioning correctly.

[0077] E1 detection method: Only the operating current of the water pump is detected. If the current is less than or greater than a specific value and remains unchanged for 30 seconds, the program will judge and report an error after 30 seconds, and the water pump will stop working. E2 detection method: When the detected water pump current reaches a specific value for stalling, the thermistor will be judged. If the NTC thermistor detects a water temperature change within two degrees within one minute and the temperature is greater than 5 degrees away from the temperature control point, a stall error will be reported, and the water pump will stop working.

[0078] 2. Temperature detection and pump body error:

[0079] EE Error: Thermistor not detected. Restarting after testing will allow normal operation. HH Error: Detected water environment exceeds 37℃ (99℉). Restarting after testing will allow normal operation. LL Error: Detected water environment is below 0℃ (32℉). Restarting after testing will allow normal operation. H1 Flashing: Current water temperature is above 15℃ (59℉). This is to detect the degree of ice melting in the water. Briefly press the temperature adjustment button to stop the flashing. E1 Flashing: Pump malfunction. Please check if liquid has been added or if the pump is not in contact with water. Restarting after testing will allow normal operation. E2 Flashing: Current water flow status is incorrect. Please check if the water pipe is kinked or disconnected. Restarting after testing will allow normal operation.

[0080] like Figure 9As shown, the temperature timing display module is equipped with LEDs D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, and D21. The diodes D22, D23, D24, D25, D26, D27, D28, D29, D30, D31, D32, D33, D34, and D35; the positive terminals of diodes D1, D7, D6, D5, D2, D3, and D4. The cathode of LED D1 is connected to pin 12 of chip U3, the cathode of LED D7 is connected to pin 4 of chip U3, the cathode of LED D2 is connected to pin 10 of chip U3, the cathode of LED D3 is connected to pin 14 of chip U3, the cathode of LED D6 is connected to pin 9 of chip U3, and the cathode of LED D5 is connected to pin 5 of chip U3; the anodes of LEDs D8, D14, D9, and D10 are connected to pin 5 of chip U3. The positive terminals of LEDs D1, D13, and D12 are connected to pin 11 of chip U3, the negative terminal of LED D8 is connected to pin 12 of chip U3, the negative terminal of LED D14 is connected to pin 4 of chip U3, the negative terminal of LED D9 is connected to pin 10 of chip U3, the negative terminal of LED D10 is connected to pin 14 of chip U3, the negative terminal of LED D11 is connected to pin 13 of chip U3, the negative terminal of LED D13 is connected to pin 9 of chip U3, and the negative terminal of LED D12 is connected to pin 5 of chip U3.The positive terminals of LEDs D15, D21, D16, D17, D18, D20, and D19 are connected to pin 10 of chip U3. The negative terminal of LED D15 is connected to pin 12 of chip U3. The negative terminal of LED D21 is connected to pin 4 of chip U3. The negative terminal of LED D16 is connected to pin 11 of chip U3. The negative terminal of LED D17 is connected to pin 14 of chip U3. Connect the cathode of LED D18 to pin 13 of chip U3; connect the cathode of LED D20 to pin 9 of chip U3; connect the cathode of LED D19 to pin 5 of chip U3; connect the anodes of LEDs D22, D28, D23, D24, D25, D27, and D26 to pin 13 of chip U3; and connect the cathode of LED D22 to pin 12 of chip U3. The pin connections are as follows: the negative terminal of LED D28 is connected to pin 4 of chip U3; the negative terminal of LED D23 is connected to pin 11 of chip U3; the negative terminal of LED D24 is connected to pin 14 of chip U3; the negative terminal of LED D25 is connected to pin 10 of chip U3; the negative terminal of LED D27 is connected to pin 9 of chip U3; and the negative terminal of LED D26 is connected to pin 5 of chip U3. The positive terminals of LEDs D29, D35, D30, and D31 are also connected. The positive terminals of LEDs D32, D33, and D34 are connected to pin 5 of chip U3. The negative terminal of LED D29 is connected to pin 12 of chip U3. The negative terminal of LED D30 is connected to pin 11 of chip U3. The negative terminal of LED D31 is connected to pin 14 of chip U3. The negative terminal of LED D32 is connected to pin 13 of chip U3. The negative terminal of LED D34 is connected to pin 9 of chip U3. The negative terminal of LED D33 is connected to pin 10 of chip U3.

[0081] It should be noted that LEDs D1, D2, D3, D4, D5, D6, and D7 constitute the TEMP_A indicator light; LEDs D8, D9, D10, D11, D12, D13, and D14 constitute the NC indicator light; LEDs D15, D16, D17, D18, D19, D20, and D21 constitute the TEMP_B indicator light; and LEDs D22, D23, D24, D25, D26, D27, D28, D29, D30, D31, D32, D33, D34, and D35 constitute the TIME_GREEN indicator light.

[0082] like Figure 10 As shown, the functional light display module is equipped with LEDs D44, D45, D46, D47, D48, and D49. The positive terminal of LED D44 is connected to pin 12 of chip U3, the positive terminal of LED D45 is connected to pin 11 of chip U3, the positive terminal of LED D46 is connected to pin 10 of chip U3, the positive terminal of LED D47 is connected to pin 13 of chip U3, the positive terminal of LED D48 is connected to pin 5 of chip U3, and the positive terminal of LED D49 is connected to pin 9 of chip U3. The negative terminals of LEDs D44, D45, D46, D47, D48, and D49 are connected to pin 4 of chip U3.

[0083] like Figure 11 As shown, the control circuit of this utility model is further provided with a power supply module for powering the main control module. The power supply module is provided with chip U2, resistor R7, coupling capacitor C2, capacitor C3, coupling capacitor C4 and capacitor C5. Pin 1 of chip U2 is connected to the positive terminal of coupling capacitor C2, and the negative terminal of coupling capacitor C2 is grounded. Pin 1 of chip U2 is connected in series with resistor R7 and connected to the VCC 12V power supply terminal. Pin 2 of chip U2 is grounded. Pin 3 of chip U2 is connected to the positive terminal of coupling capacitor C4, and the negative terminal of coupling capacitor C4 is grounded. Pin 3 of chip U2 is connected in series with capacitor C5 and grounded. Pin 3 of chip U2 is connected to the VCC power supply terminal.

[0084] It should be noted that, as Figure 12As shown, in the button module, button S1 serves as the power on / off button, button S2 as the TIME_ON- button, button S3 as the TIME_ON+ button, button S4 as the TIME_OFF- button, and button S5 as the TIME_OFF+ button. In the function light display module, LED D44 is a real-time temperature indicator (e.g., ...). Figure 12 F1 in the diagram), LED D45 is the temperature setting indicator (e.g., F1 ...). Figure 12 In the diagram, LED D46 is the NULL indicator, LED D47 is the MIN indicator, LED D48 is the ON indicator, and LED D49 is the OFF indicator.

[0085] The working principle of this utility model is as follows: the power supply module steps down the 12V voltage from the DC5521 input line to 5V through the chip U2 and provides it to the main control module.

[0086] Temperature timing display module: Displays the currently set TIME_OFF and TIME_ON values ​​and their corresponding remaining values ​​in the display area, and displays the set temperature and the temperature measured by the thermistor R20 in the current temperature measurement module after conversion to Fahrenheit.

[0087] Pump control module: The PWM waveform is controlled by the RB5 port of the chip U5 in the main control module to control the conduction and disconnection of the field-effect transistor Q1, thereby controlling the pump body. Resistor R17 is a half-alloy resistor connected to the source of the field-effect transistor Q1 and then connected to the common ground. The ADC of RA0 in the chip U5 of the main control module detects the voltage change at the high and low terminals of resistor R17. The pump control module detects the current change of the pump body to detect whether the pump body is running dry or under load. The measured current change range of the pump body running dry and working in water is about 200mA. The control circuit of this utility model can detect the current status of the pump body and the temperature change of the thermistor R20 to determine the current motor status.

[0088] The button module utilizes the principle of voltage division by resistors to determine which button is pressed. The ADC function of the RB6 I / O port of the main control module chip U5 detects which button is pressed, thereby realizing the function of different buttons.

[0089] Temperature measurement module: It utilizes the resistance of thermistor R20 to change with temperature, and then connects thermistor R20 to the pull-up resistor of resistor R15. Using the ADC function of RB4 of chip U5, the temperature is determined by looking up the resistance-temperature correspondence table of thermistor R20.

[0090] This cooling compress machine, which controls the flow rate based on the inlet liquid temperature, can detect the temperature of the cold liquid returning to the insulation box from the cooling pad and control the flow rate of the cold liquid accordingly, thereby achieving temperature control of the cooling pad. The U5 chip in this machine can also be programmed with different operating modes to suit various work requirements.

[0091] Example 2

[0092] A cold compress machine that controls the flow rate based on the inlet liquid temperature, having the same features as Embodiment 1, further includes the following features: Chip U5 is model SC8F083AD716SP, field-effect transistor Q1 is model NCE3080K, thermistor R20 is NTC, chip U2 is model L78M05, resistors R6 and R15 have a resistance of 5.1K ohms, capacitor C7 has a capacitance of 100 nanofarads, and resistors R16 and R9 have a resistance of... 100 ohms, resistor R10 has a resistance of 10 kΩ, resistor R17 has a resistance of 470 milliohms, resistors R5 and R1 have a resistance of 10 kΩ, resistor R3 has a resistance of 51 kΩ, resistor R4 has a resistance of 30 kΩ, capacitor C1 has a capacitance of 100 picofarads, resistor R7 has a resistance of 22 ohms, coupling capacitor C2 has a capacitance of 47 microfarads, capacitors C5 and C3 have a capacitance of 100 nanofarads, and coupling capacitor C4 has a capacitance of 200 farads.

[0093] Compared with Example 1, the components of the cold compress machine control circuit that controls the flow rate of cold liquid according to temperature in this example are all commercially available components, thus having the advantage of low production cost.

[0094] Example 3

[0095] A control circuit for a cold compress machine that controls the flow rate of cold liquid based on temperature, wherein the control circuit for the cold compress machine that controls the flow rate based on the inlet liquid temperature is the control circuit in Example 1 or 2.

[0096] The control circuit of this cold compress machine can detect the temperature of the cold liquid flowing back to the heat preservation box from the cold compress pad, and control the flow rate of the cold liquid according to the cold liquid temperature, thereby realizing the temperature control of the cold compress pad by the cold compress machine.

[0097] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model 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 this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A cold compress machine that controls the flow rate based on the inlet liquid temperature, characterized in that: The system includes an insulated box for storing a cold source, a cold compress pad, a pump body installed inside the insulated box to pump out the cold liquid from the insulated box, an outlet pipe connecting the insulated box and the cold compress pad for delivering the cold liquid from the insulated box to the cold compress pad, a return pipe connecting the cold compress pad and the insulated box for returning the cold liquid from the cold compress pad to the insulated box, and a control circuit. The pump body is connected to the outlet pipe. The control circuit is equipped with a temperature measuring module for collecting the temperature of the cold liquid flowing back from the cold pad to the heat preservation box, a pump control module for controlling the flow rate of the cold liquid to control the temperature of the cold pad, and a main control module for operating the pump power according to the cold liquid temperature. The temperature measuring module and the pump control module are respectively connected to the main control module. The temperature measuring module is located inside the return pipe, and the pump control module controls the pump.

2. The cold compress machine for controlling the flow rate based on the inlet liquid temperature according to claim 1, characterized in that: The detection unit of the temperature measurement module is located inside the return pipe.

3. The cold compress machine for controlling the flow rate based on the inlet liquid temperature according to claim 2, characterized in that: The return pipe is equipped with a first one-way valve that is inserted into the wall of the insulation box, and the detection unit is located inside the first one-way valve. The liquid outlet pipe is equipped with a second one-way valve that is inserted into the wall of the insulated box.

4. The cold compress machine for controlling the flow rate based on the inlet liquid temperature according to claim 3, characterized in that: The temperature measurement module is equipped with a resistor R15, a thermistor R20 as a detection unit, and a capacitor C7. One end of the resistor R15 is connected to the VCC power supply terminal, the other end of the resistor R15 is connected in series with the capacitor C7 and grounded, the other end of the resistor R15 is connected in series with the thermistor R20 and grounded, and the other end of the resistor R15 is also connected to the main control module. The thermistor R20 is located inside the first one-way valve.

5. The cold compress machine for controlling the flow rate based on the inlet liquid temperature according to claim 4, characterized in that: The pump control module is equipped with a field-effect transistor Q1, resistors R9, R10, R16, and R17. The gate (G) terminal of the field-effect transistor Q1 is connected in series with one end of resistor R9, and the other end of resistor R9 is connected to the main control module. The gate (G) terminal of the field-effect transistor Q1 is connected to one end of resistor R10, and the other end of resistor R10 is connected in series with one end of resistor R16. The other end of resistor R16 is connected to the main control module, and the other end of resistor R10 is connected in series with resistor R17 to ground. The other end of resistor R10 is connected to the source (S) terminal of the field-effect transistor Q1, and the drain (D) terminal of the field-effect transistor Q1 is connected to the external pump body.

6. The cold compress machine for controlling the flow rate based on the inlet liquid temperature according to claim 5, characterized in that: The main control module is equipped with chip U5 and capacitor C6. Pin 1 of chip U5 is connected to ground in series with capacitor C6. Pin 1 of chip U5 is connected to the VCC power supply terminal. Pin 6 of pin 1 of chip U5 is connected to the other end of resistor R15. Pin 7 of chip U5 is connected to the other end of resistor R9. Pin 15 of chip U5 is connected to the other end of resistor R16.

7. The cold compress machine for controlling the flow rate based on the inlet liquid temperature according to claim 6, characterized in that: The control circuit is also equipped with a button module, a temperature timing display module, and a function light display module, all of which are connected to the main control module. The button module is equipped with resistors R1, R3, R4, R5, and R6, capacitor C1, and buttons S1, S2, S3, S4, and S5. One end of resistor R1 is connected to the VCC power supply terminal, and the other end of resistor R1 is connected to pin 8 of chip U5. The other end of resistor R1 is connected in series with capacitor C1 and grounded. The other end of resistor R1 is connected in series with button S1 and grounded. The other end of resistor R1 is connected in series with resistor R3 and button S2 and grounded. The other end of resistor R1 is connected in series with resistor R4 and button S3 and grounded. The other end of resistor R1 is connected in series with resistor R5 and button S4 and grounded. The other end of resistor R1 is connected in series with resistor R6 and button S5 and grounded. The temperature timing display module is equipped with LEDs D1, D2, D3, D4, D5, D6, D7, D8, D9, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25, D26, and D27. Diodes D28, D29, D30, D31, D32, D33, D34, and D35; the positive terminals of D1, D7, D6, D5, D2, D3, and D4 are connected to pin 12 of chip U3. The negative terminal of D1 is connected to pin 11 of chip U3. The negative terminal of D7 is connected to pin 4 of chip U3. The negative terminal of D2 is connected to pin 10 of chip U3. The negative terminal of D3 is connected to pin 14 of chip U3. The negative terminal of LED D6 is connected to pin 9 of chip U3. The negative terminal of LED D5 is connected to pin 5 of chip U3. The positive terminals of LEDs D8, D14, D9, D10, D11, D13, and D12 are connected to pin 11 of chip U3. The negative terminal of LED D8 is connected to pin 12 of chip U3. The negative terminal of LED D14 is connected to pin 4 of chip U3. The negative terminal of LED D9 is connected to pin 10 of chip U3. The negative terminal of LED D10 is connected to pin 14 of chip U3. The negative terminal of LED D11 is connected to pin 13 of chip U3. The negative terminal of LED D13 is connected to pin 9 of chip U3. The negative terminal of LED D12 is connected to pin 5 of chip U3. The positive terminals of LEDs D15, D21, D16, D17, D18, D20, and D19 are connected to pin 10 of chip U3. The negative terminal of LED D15 is connected to pin 12 of chip U3. The negative terminal of LED D21 is connected to pin 4 of chip U3. The negative terminal of LED D16 is connected to pin 11 of chip U3. The negative terminal of LED D17 is connected to pin 14 of chip U3. The negative terminal of LED D18 is connected to pin 13 of chip U3.The negative terminal of LED D20 is connected to pin 9 of chip U3; the negative terminal of LED D19 is connected to pin 5 of chip U3; the positive terminals of LEDs D22, D28, D23, D24, D25, D27, and D26 are connected to pin 13 of chip U3; the negative terminal of LED D22 is connected to pin 12 of chip U3; the negative terminal of LED D28 is connected to pin 4 of chip U3; the negative terminal of LED D23 is connected to pin 11 of chip U3; the negative terminal of LED D24 is connected to pin 14 of chip U3; the negative terminal of LED D25 is connected to pin 10 of chip U3; and the negative terminal of LED D27... Connect LED D26 to pin 9 of chip U3; connect the negative terminal of LED D26 to pin 5 of chip U3; connect the positive terminals of LEDs D29, D35, D30, D31, D32, D33, and D34 to pin 5 of chip U3; connect the negative terminal of LED D29 to pin 12 of chip U3; connect the negative terminal of LED D30 to pin 11 of chip U3; connect the negative terminal of LED D31 to pin 14 of chip U3; connect the negative terminal of LED D32 to pin 13 of chip U3; connect the negative terminal of LED D34 to pin 9 of chip U3; and connect the negative terminal of LED D33 to pin 10 of chip U3. The functional light display module is equipped with LEDs D44, D45, D46, D47, D48, and D49. The positive terminal of LED D44 is connected to pin 12 of chip U3, the positive terminal of LED D45 is connected to pin 11 of chip U3, the positive terminal of LED D46 is connected to pin 10 of chip U3, the positive terminal of LED D47 is connected to pin 13 of chip U3, the positive terminal of LED D48 is connected to pin 5 of chip U3, and the positive terminal of LED D49 is connected to pin 9 of chip U3. The negative terminals of LEDs D44, D45, D46, D47, D48, and D49 are connected to pin 4 of chip U3.

8. The cold compress machine according to any one of claims 1-7, characterized in that: The control circuit is also provided with a power supply module for supplying power to the main control module. The power supply module is provided with chip U2, resistor R7, coupling capacitor C2, capacitor C3, coupling capacitor C4 and capacitor C5. Pin 1 of chip U2 is connected to the positive terminal of coupling capacitor C2, and the negative terminal of coupling capacitor C2 is grounded. Pin 1 of chip U2 is connected in series with resistor R7 and connected to the VCC 12V power supply terminal. Pin 2 of chip U2 is grounded. Pin 3 of chip U2 is connected to the positive terminal of coupling capacitor C4, and the negative terminal of coupling capacitor C4 is grounded. Pin 3 of chip U2 is connected in series with capacitor C5 and grounded. Pin 3 of chip U2 is connected to the VCC power supply terminal.

9. The cold compress machine for controlling the flow rate based on the inlet liquid temperature according to any one of claims 1-7, characterized in that: The main control module has an overheating and ice-adding mode, a countdown mode, a loop mode, and a perpetual non-stop mode.

10. A control circuit for a cold compress machine that controls the flow rate of cold liquid based on temperature, characterized in that: The control circuit in the cold compress machine that controls the flow rate according to the inlet liquid temperature as described in any one of claims 1 to 9.

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