Humidifier heating and temperature measuring device for breathing machine
By designing a humidifier heating and temperature measurement device for ventilators, and using two thermocouple compensation lines to achieve heating and temperature measurement functions, the problem of excessive number of cables and needles in the prior art is solved, and the connection reliability and space efficiency are improved.
Patent Information
- Application Number
- CN202420989533.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-09
- Publication Date
- 2025-03-14
- Estimated Expiration
- 2034-05-09
AI Technical Summary
The heating and temperature measurement device of existing ventilator humidifiers requires four independent cables and four needles, resulting in large space occupation and low connection reliability.
A humidifier heating and temperature measurement device for ventilators was designed, and the heating and temperature measurement functions were realized through two thermocouple compensation lines. The heating wire and fuse connected in series were used to reduce the number of cables and needles.
The heating and temperature measurement functions can be completed using two cables, which reduces the volume occupied by the cable and the number of connectors, improves connection reliability, and has a very short temperature measurement time, which does not affect the heating effect.
Smart Images
Figure CN222605179U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of medical equipment, in particular to a humidifier heating and temperature measuring device for a ventilator. Background Art
[0002] With the advancement of technology and the development of clinical medicine, the use of ventilators to treat adult obstructive sleep apnea has become an effective treatment method. The humidifier is a working module of the ventilator, which is used to heat water to make the air temperature in the ventilator pipeline suitable for human body temperature. It can also increase the air humidity in the pipeline to improve the comfort of treatment.
[0003] The current ventilator humidifier usually arranges a heating wire and a temperature measuring element in the heating device. The heating wire and the temperature measuring element each require two independent cables to connect to the ventilator. For a compact ventilator design, the connectors required for the four cables will take up a certain amount of space. In particular, for a design that requires a spring pin to connect the humidifier and the ventilator, four spring pins are required, which not only occupies a large volume, but also reduces the connection reliability. Utility Model Content
[0004] The utility model aims to overcome the defects of the prior art and proposes a humidifier heating and temperature measuring device for a ventilator.
[0005] The utility model provides a humidifier heating and temperature measuring device for a ventilator, comprising a heating device 3 arranged inside a humidifier 2, comprising a temperature measuring element 13, a first thermocouple compensation wire 4 and a second thermocouple compensation wire 5 arranged inside the ventilator 1; a heating wire 8, a third thermocouple compensation wire 6 and a fourth thermocouple compensation wire 7 are arranged inside the heating device 3, one end of the third thermocouple compensation wire 6 is connected to one end of the heating wire 8, the other end of the third thermocouple compensation wire 6 is connected to the first thermocouple compensation wire 4, one end of the fourth thermocouple compensation wire 7 is connected to the other end of the heating wire 8, and the other end of the fourth thermocouple compensation wire 7 is also connected to the second thermocouple compensation wire 5.
[0006] Preferably, a fuse 9 is also provided inside the heating device; the third thermocouple compensation wire 6, the fuse 9, the heating wire 8, and the fourth thermocouple compensation wire 7 are connected in series in sequence. It is also further preferred that a group of thermocouple compensation wires, namely the fifth thermocouple compensation wire 20 and the sixth thermocouple compensation wire 21, are placed between the heating wire 8 and the fuse 9 in the heating device 3, and the ends are connected together and placed at a place where the temperature needs to be monitored, which can be the heating device, or the ends can be connected together and placed at other places where temperature control and temperature measurement are required, such as the housing.
[0007] Preferably, a ventilator control board 10 is provided inside the ventilator 1, and the other ends of the first thermocouple compensation wire 4 and the second thermocouple compensation wire 5 are respectively connected to the ventilator control board 10.
[0008] Preferably, the ventilator control board 10 is provided with a heating control circuit 11 , an analog amplifier circuit 12 and a temperature measuring element 13 .
[0009] Preferably, the two output ports of the heating control circuit 11 and the two input ports of the analog amplifier circuit 12 are respectively merged at a connection node; the heating control circuit 11 is used to control the output voltage to the connection node, and is used to provide power to the humidifier heating device through the first thermocouple compensation line 4 and the second thermocouple compensation line 5;
[0010] The analog amplifier circuit 12 collects the weak potential difference at the connection node and sends it to the controller for temperature measurement after processing;
[0011] The temperature measuring element 13 is arranged around the connection node and is used to measure the temperature at the connection node as cold end compensation to obtain the actual temperature of the hot end.
[0012] Preferably, the connection method between the first thermocouple compensation wire 4 and the third thermocouple compensation wire 6, and between the second thermocouple compensation wire 5 and the fourth thermocouple compensation wire 7 includes one or more of welding, connector or spring pin.
[0013] Preferably, one end of the third thermocouple compensation wire 6 is connected to one end of the heating wire 8, and the other end of the third thermocouple compensation wire 6 is led to the first spring pin 14 of the humidifier, one end of the fourth thermocouple compensation wire 7 is connected to the other end of the heating wire 8, and the other end of the fourth thermocouple compensation wire 7 is led to the second spring pin 15 of the humidifier;
[0014] The first thermocouple compensation line 4 is connected to the first contact 16 of the ventilator, and the other end is connected to the first connection node 18 of the ventilator control board 10;
[0015] The second thermocouple compensation line 5 is connected to the second contact 17 of the ventilator, and the other end is connected to the second connection node 19 of the ventilator control board 10;
[0016] The first elastic pin 14 is connected to the first contact 16 , and the second elastic pin 15 is connected to the second contact 17 .
[0017] Preferably, the type of the thermocouple compensating wire connected to the contact is the same as the type of the thermocouple compensating wire on the corresponding spring pin.
[0018] Compared with the prior art, the advantages of the present invention are:
[0019] The utility model can realize the heating and temperature measurement functions of the humidifier by using two cables; the heating and temperature measurement are performed alternately in time, and the time required for temperature measurement is extremely short, which does not affect the heating effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic diagram of a humidifier heating and temperature measuring device for a ventilator according to the utility model;
[0021] Figure 2 This is a schematic diagram of the humidifier heating device of the utility model;
[0022] Figure 3 This is a working principle diagram of the humidifier heating and temperature measuring device for a ventilator of the utility model;
[0023] Reference numerals:
[0024] 1. Ventilator, 2. Humidifier, 3. Heating device, 4. First thermocouple compensation wire, 5. Second thermocouple compensation wire, 6. Third thermocouple compensation wire, 7. Fourth thermocouple compensation wire, 8. Heating wire, 9. Fuse, 10. Ventilator control board, 11. Heating control circuit, 12. Analog amplifier, 13. Temperature measuring element, 14. First spring pin, 15. Second spring pin, 16. First contact, 17. Second contact, 18. First connecting node, 19. Second connecting node, 20. Fifth thermocouple compensation wire, 21. Sixth thermocouple compensation wire. DETAILED DESCRIPTION
[0025] The technical solution of the utility model is described in detail below in conjunction with the embodiments and drawings.
[0026] The utility model provides a humidifier heating and temperature measuring device for a ventilator, such as Figure 1 As shown, the first thermocouple compensation line 4 and the second thermocouple compensation line 5 are arranged in the ventilator 1, the third thermocouple compensation line 6 and the fourth thermocouple compensation line 7 are arranged in the humidifier 2, the first thermocouple compensation line 4 and the third thermocouple compensation line 6 are connected as one cable, the second thermocouple compensation line 5 and the fourth thermocouple compensation line 7 are connected as another cable, and two cables are used to connect the ventilator 1 and the humidifier 2, and the heating and temperature measurement functions are realized through these two cables. In addition, as fewer cables are used, the volume occupied by the cables is correspondingly reduced; at the same time, the volume of the connector used at the connection between the ventilator 1 and the humidifier 2 is reduced.
[0027] Specifically, Figure 1As shown, the humidifier 2 has a heating device 3 inside, and the heating device has a heating wire 8, a fuse 9, and a third thermocouple compensation wire 6 and a fourth thermocouple compensation wire 7 inside; the third thermocouple compensation wire 6, the heating wire 8, the fuse 9, and the fourth thermocouple compensation wire 7 are connected in series in sequence; the thermocouple compensation wire can be a K-type, T-type, J-type, or other type of cable consisting of two different metal wires; one of the wires, the third thermocouple 6 compensation wire (taking the T-type thermocouple compensation wire as an example, a pure copper wire) is connected to the fuse and led to the first spring pin 14 of the humidifier, and the other wire, the fourth thermocouple compensation wire 7 (taking the T-type thermocouple compensation wire as an example, a copper-nickel alloy wire) is connected to the heating wire and led to the second spring pin 15 of the humidifier. Using the connection method of the spring pin, the number of spring pins is reduced, and the connection reliability will be improved. The utility model greatly reduces the required connector volume or the number of spring pins by using two thermocouple compensation wires as cables for heating and temperature measurement at the same time, and since the number of spring pins is halved, the connection reliability is also improved. It may also be preferred to use a welding fixed connection method, which reduces the number of pads and greatly reduces the risk of pad short circuit caused by welding.
[0028] like Figure 1As shown, the connection between the ventilator 1 and the humidifier 2 uses the same type of thermocouple compensation wire, one end of the first thermocouple compensation wire 4 is connected to the first contact 16 of the ventilator, the other end of the first thermocouple compensation wire 4 is connected to the first connection node 18 of the ventilator control board 10, one end of the second thermocouple compensation wire 5 is connected to the second contact 17 of the ventilator, the other end of the second thermocouple compensation wire 5 is connected to the second connection node 19 of the ventilator control board 10, the first contact 16 is connected to the first elastic pin 14, the second contact 17 is connected to the second elastic pin 15, and the type of wire connected to the contacts is the same as the type of wire on the corresponding elastic pin; the ventilator control board 10 inside the ventilator 1 is provided with a heating control circuit 11, an analog amplifier circuit 12, and a temperature measuring element 13; the two output ports of the heating control circuit 11 and the analog amplifier circuit 12 are connected to the ... The two input ports of the circuit are respectively joined at the connection node; the heating control circuit 11 is used to control the output voltage to the connection node, and then provide power to the humidifier heating device through two cables; the heating control circuit 11 intermittently outputs voltage, and when the output is turned off, the temperature is measured through the analog amplifier circuit 12; the analog amplifier circuit 12 collects the weak potential difference at the connection node, and sends it to the controller for temperature measurement after filtering and amplification. This test is only performed when the heating control circuit 11 turns off the output; the potential difference at the connection node is due to the difference between the temperature at the heating device and the temperature at the connection node. The thermocouple compensation line generates a potential difference because two different materials are used; the temperature measuring element 13 is arranged near the connection node, and is used to test the temperature at the connection node as cold end compensation to calculate the actual temperature of the hot end. The acquisition process and the calculation process are conventional methods in this field, and do not involve improvements to the method. It is also possible to further preferably place a set of thermocouple compensation wires (fifth thermocouple compensation wire 20 and sixth thermocouple compensation wire 21) between the heating wire 8 and the fuse 9 in the heating device 3 and connect the ends together and place them at a location where the temperature needs to be monitored, which may be the heating device. The results of this solution can also be achieved, such as Figure 2 In addition, the ends can be connected together and placed on the housing or other places where temperature control and temperature measurement are required.
[0029] The utility model uses two pairs of thermocouple compensation wires of the same type to eliminate the influence of the temperature at the connection between the ventilator and the humidifier; the temperature measuring element at the connection node of the ventilator control board measures the cold end temperature in real time and participates in calculation compensation to obtain the real-time accurate temperature of the hot end.
[0030] Specifically, Figure 3 As shown, the working principle of the humidifier heating and temperature measuring device for the ventilator is:
[0031] V0 and V5 are the electromotive forces of the two connection points at the connection node respectively;
[0032] V1 and V4 are the electromotive forces at the connection points of the two spring pins respectively;
[0033] V2 and V3 are the electromotive forces of the two connection points of the heating device;
[0034] Because for the third thermocouple compensation wire 6, the Seebeck electromotive force difference ΔV1=V2-V1=Sa*(T3-T2) caused by the temperature difference at both ends, Sa is the Seebeck coefficient of material A, the same below;
[0035] Similarly, for the fourth thermocouple compensation wire 7, the first thermocouple compensation wire 4, and the second thermocouple compensation wire 5, the Seebeck electromotive force difference caused by the temperature difference at both ends is:
[0036] ΔV2=V3-V4=Sb*(T3-T2), Sa is the Seebeck coefficient of material A, the same below
[0037] ΔV3=V1-V0=Sa*(T2-T1)
[0038] ΔV4=V4-V5=Sb*(T2-T1)
[0039] Since the temperature at the heating device can be considered uniform, there is no temperature difference between the two ends of the heating wire, that is, the electromotive force difference between the two ends of the heating wire is 0, and V2 = V3 at this time;
[0040] Based on the above conditions, the electromotive force difference at the connection node can be calculated as ΔV = V0-V5 = -(Sa-Sb)(T3-T1)
[0041] It can be seen that the electromotive force difference is only related to the temperature difference between the heating device and the connection node, and the material properties of the two wires.
[0042] The connector, spring pin and other methods at the connection between the ventilator and the humidifier in the utility model can also be eliminated for the solution where the humidifier and the ventilator cannot be disassembled; the same humidifier and ventilator can also undergo two or more transfers without affecting the temperature measurement.
[0043] Any content not described in detail in the present invention can be based on the conventional technical knowledge in the field.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model and are not intended to limit it. Although the utility model is described in detail with reference to the embodiments, a person skilled in the art should understand that any modification or equivalent replacement of the technical solution of the utility model does not deviate from the spirit and scope of the technical solution of the utility model, and should be included in the scope of the claims of the utility model.
Claims
1. A humidifier heating and temperature measuring device for a ventilator, characterized in that: The invention comprises a heating device (3) arranged inside a humidifier (2), comprising a temperature measuring element (13) arranged inside a ventilator (1), a first thermocouple compensation wire (4) and a second thermocouple compensation wire (5); a heating wire (8), a third thermocouple compensation wire (6) and a fourth thermocouple compensation wire (7) are arranged inside the heating device (3); one end of the third thermocouple compensation wire (6) is connected to one end of the heating wire (8), the other end of the third thermocouple compensation wire (6) is connected to the first thermocouple compensation wire (4), one end of the fourth thermocouple compensation wire (7) is connected to the other end of the heating wire (8), and the other end of the fourth thermocouple compensation wire (7) is also connected to the second thermocouple compensation wire (5).
2. The humidifier heating and temperature measuring device according to claim 1, characterized in that: A fuse (9) is also provided inside the heating device; the third thermocouple compensation wire (6), the fuse (9), the heating wire (8), and the fourth thermocouple compensation wire (7) are connected in series in sequence.
3. The humidifier heating and temperature measuring device according to claim 2, characterized in that: A set of thermocouple compensation wires are placed between the heating wire (8) and the fuse (9) in the heating device (3), and the ends are connected together and placed at a location where the temperature needs to be monitored.
4. The humidifier heating and temperature measuring device according to claim 3, characterized in that: Connect the ends of a set of thermocouple compensation wires together and place them on the housing.
5. The humidifier heating and temperature measuring device according to claim 1, characterized in that: A ventilator control board (10) is arranged inside the ventilator (1), and the other ends of the first thermocouple compensation wire (4) and the second thermocouple compensation wire (5) are respectively connected to the ventilator control board (10).
6. The humidifier heating and temperature measuring device according to claim 5, characterized in that: The ventilator control panel (10) is provided with a heating control circuit (11), an analog amplifier circuit (12) and a temperature measuring element (13).
7. The humidifier heating and temperature measuring device according to claim 6, characterized in that: The two output ports of the heating control circuit (11) and the two input ports of the analog amplifier circuit (12) are respectively connected at a connection node; the heating control circuit (11) is used to control the output voltage to the connection node, which is used to provide power to the humidifier heating device through the first thermocouple compensation line (4) and the second thermocouple compensation line (5); The analog amplifier circuit (12) collects the weak potential difference at the connection node and sends it to the controller for temperature measurement after processing; The temperature measuring element (13) is arranged around the connection node and is used to measure the temperature at the connection node as cold end compensation to obtain the actual temperature of the hot end.
8. The humidifier heating and temperature measuring device according to claim 1, characterized in that: The connection method between the first thermocouple compensation wire (4) and the third thermocouple compensation wire (6), and between the second thermocouple compensation wire (5) and the fourth thermocouple compensation wire (7) comprises one or more of welding, connector or spring pin.
9. The humidifier heating and temperature measuring device according to claim 8, characterized in that: One end of the third thermocouple compensation wire (6) is connected to one end of the heating wire (8), and the other end of the third thermocouple compensation wire (6) is led to the first spring pin (14) of the humidifier; one end of the fourth thermocouple compensation wire (7) is connected to the other end of the heating wire (8), and the other end of the fourth thermocouple compensation wire (7) is led to the second spring pin (15) of the humidifier; A first thermocouple compensation wire (4) is connected to a first contact (16) of the ventilator, and the other end is connected to a first connection node (18) of a ventilator control board (10); The second thermocouple compensation wire (5) is connected to the second contact point (17) of the ventilator, and the other end is connected to the second connection node (19) of the ventilator control board (10); The first elastic needle (14) is connected to the first contact point (16), and the second elastic needle (15) is connected to the second contact point (17).
10. The humidifier heating and temperature measuring device according to claim 9, characterized in that: The type of thermocouple compensating wire conductors connected to the contacts is the same as the type of thermocouple compensating wire conductors on the corresponding spring pins.