CN216056321U - Breathing auxiliary equipment - Google Patents
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- CN216056321U CN216056321U CN202121282401.2U CN202121282401U CN216056321U CN 216056321 U CN216056321 U CN 216056321U CN 202121282401 U CN202121282401 U CN 202121282401U CN 216056321 U CN216056321 U CN 216056321U
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Abstract
The utility model discloses a breathing assistance device, wherein the breathing assistance device comprises a main control module, a heating loop and a heating loop protection circuit, wherein the heating loop protection circuit is used for being connected with the heating loop and comprises an acquisition sub-circuit, a suppression sub-circuit, a protection sub-circuit and a discharge sub-circuit; the acquisition sub-circuit acquires the input voltage of the protection sub-circuit and transmits the input voltage to the inhibition sub-circuit; clamping, by the suppressor sub-circuit, the input voltage and discharging current through the bleed sub-circuit; and carrying out short-circuit protection by the protection sub-circuit when the current is overhigh. According to the utility model, the voltage of the heating loop is monitored, the input voltage is inhibited through the inhibiting sub-circuit, the overvoltage protection is realized through voltage clamping, and the overcurrent protection is realized through the protecting sub-circuit when the current of the circuit is overhigh, so that the safety risk caused by triggering electric sparks at instantaneous high voltage is avoided.
Description
Technical Field
The utility model relates to the technical field of circuits, in particular to a breathing assistance device.
Background
The existing breathing assistance equipment (such as a breathing machine) is generally provided with a plurality of pipelines, each pipeline is provided with an identity recognition element and a temperature detection circuit, the breathing assistance equipment recognizes pipeline information through the identity recognition element, and detects the temperatures of an air inlet and an air outlet of the pipeline through the temperature detection circuit to perform corresponding breathing work modes.
However, in the use process of the heating circuit of the existing breathing assistance device, the situation that the circuit is connected in a wrong way or the instantaneous voltage is too high during power connection and the like can occur, so that electric leakage contact sparks occur, and great safety risk is caused.
Thus, the prior art has yet to be improved and enhanced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide breathing assistance equipment which can effectively avoid safety risks caused by triggering electric sparks by instantaneous high voltage.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a breathing assistance device comprises a main control module, a heating loop and a heating loop protection circuit connected with the heating loop, wherein the heating loop protection circuit comprises an acquisition sub-circuit, a suppression sub-circuit, a protection sub-circuit and a discharge sub-circuit; the acquisition sub-circuit acquires the input voltage of the protection sub-circuit and transmits the input voltage to the inhibition sub-circuit; clamping, by the suppressor sub-circuit, the input voltage and discharging current through the bleed sub-circuit; and carrying out short-circuit protection by the protection sub-circuit when the current is overhigh.
In the breathing assistance device, the acquisition sub-circuit comprises a first diode, a second diode and a third diode; the input end of the first diode, the input end of the second diode and the input end of the third diode are connected with the protection sub-circuit and respectively collect a first input voltage, a second input voltage and a third input voltage; and the output end of the first diode, the output end of the second diode and the output end of the third diode are all connected with the suppressor sub-circuit.
In the heating circuit protection circuit, the protection sub-circuit includes:
a first protection unit for short-circuit protection of the heating wire;
the second protection unit is used for carrying out short-circuit protection on the temperature detection module of the heating loop;
the third protection unit is used for carrying out short-circuit protection on the bleeder sub-circuit;
the one end of first protection unit with the input of heater strip is connected, the other end of first protection unit inserts first power, the one end of second protection unit with gather sub-circuit and connect and insert input voltage, the other end of second protection unit with heating circuit's temperature detection module and identification module are connected, the one end of third protection unit with the suppression sub-circuit is connected, the other end of third protection unit with the sub-circuit that releases connects.
The breathing assistance device in, host system is including being used for carrying out short-circuit protection's first protection unit to the heater strip, the one end and the power output of first protection unit are connected, the other end of first protection unit inserts power input end.
In the breathing assistance apparatus, the protection sub-circuit includes: the second protection unit is used for carrying out short-circuit protection on the temperature detection module of the heating loop; the third protection unit is used for carrying out short-circuit protection on the bleeder sub-circuit; one end of the second protection unit is connected with the acquisition sub-circuit and is connected with input voltage, the other end of the second protection unit is connected with the temperature detection module and the identification module of the heating loop, one end of the third protection unit is connected with the suppression sub-circuit, and the other end of the third protection unit is connected with the discharge sub-circuit.
In the breathing assistance device, the first protection unit comprises a first resistor and a first fuse; one end of the first fuse is connected with one end of the first resistor, the other end of the first fuse is connected with the input end of the heating wire, and the other end of the first resistor is connected with the anode of the first power supply.
In the breathing assistance device, the first protection unit comprises a second resistor and a second fuse; one end of the second fuse is connected with one end of the second resistor, the other end of the second fuse is connected with the power output end, and the other end of the second resistor is connected with the power input end.
In the breathing assistance device, the second protection unit comprises a first protective tube, a second protective tube and a third protective tube; one end of the first protective tube is connected with the input end of the first diode and is connected with a first input voltage; the other end of the first protective pipe is connected with the temperature detection module; one end of the second protective tube is connected with the input end of the second diode and is connected with a second input voltage; the other end of the second protective tube is connected with the temperature detection module; one end of the third protective tube is connected with the input end of the third diode and is connected with a third input voltage; the other end of the third protective tube is connected with the identification module.
In the breathing assistance device, the first fuse is a self-recovery fuse.
In the breathing assistance apparatus, the second fuse is a self-recovery fuse.
Compared with the prior art, the utility model provides a breathing assistance device, wherein the breathing assistance device comprises a main control module, a heating loop and a heating loop protection circuit connected with the heating loop, and the heating loop protection circuit comprises an acquisition sub-circuit, a suppression sub-circuit, a protection sub-circuit and a discharge sub-circuit; the acquisition sub-circuit acquires the input voltage of the protection sub-circuit and transmits the input voltage to the inhibition sub-circuit; clamping, by the suppressor sub-circuit, the input voltage and discharging current through the bleed sub-circuit; and carrying out short-circuit protection by the protection sub-circuit when the current is overhigh. According to the utility model, the voltage of the heating loop is monitored, the input voltage is inhibited through the inhibiting sub-circuit, the overvoltage protection is realized through voltage clamping, and the overcurrent protection is realized through the protecting sub-circuit when the current of the circuit is overhigh, so that the safety risk caused by triggering electric sparks at instantaneous high voltage is avoided.
Drawings
Fig. 1 is a block diagram of a breathing assistance apparatus provided by the present invention;
fig. 2 is a circuit diagram of a first embodiment of a breathing assistance apparatus provided by the utility model;
fig. 3 is a circuit diagram of a second embodiment of a breathing assistance apparatus provided by the present invention.
Detailed Description
The utility model aims to provide breathing assistance equipment which can effectively avoid safety risks caused by triggering electric sparks by instantaneous high voltage.
In order to make the objects, technical solutions and effects of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.
Referring to fig. 1, the breathing assistance apparatus provided by the present invention includes a heating circuit 10, a heating circuit protection circuit 20 connected to the heating circuit, and a main control module 30, wherein the heating circuit 10 is connected to the heating circuit protection circuit 20, and the heating circuit 10 is short-circuited by the heating protection circuit when the heating circuit 10 is short-circuited. The heating circuit protection circuit 20 is configured to be connected to the heating circuit 10, and the heating circuit protection circuit 20 includes an acquisition sub-circuit 210, a suppression sub-circuit 220, a protection sub-circuit 230, and a bleeding sub-circuit 240. The heating circuit 10 is generally powered and controlled by a main control module 30, the collecting sub-circuit 210 is respectively connected to the main control module 30, the protecting sub-circuit 230 and the suppressing sub-circuit 220, the protecting sub-circuit 230 is further connected to the heating circuit 10, the heating circuit 10 is further connected to the bleeding sub-circuit 240, the main control module 30 may be a main control chip of a breathing assistance device, may also be an external main control circuit, and the like, which is not limited herein. The heating circuit protection circuit 20 is arranged between the main control module 30 and the heating circuit 10 to avoid the safety risk caused by the instantaneous high-voltage triggered electric spark of the heating circuit 10.
In specific implementation, the collecting sub-circuit 210 collects the input voltage of the protection sub-circuit 230 and transmits the input voltage to the suppressing sub-circuit 220; clamping the input voltage by the inhibitor sub-circuit 220 and discharging current through the bleed sub-circuit 240; short-circuit protection is performed by the protection sub-circuit 230 when the current is too high. The embodiment simultaneously realizes voltage clamping protection and overcurrent protection, so that the heating circuit 10 avoids overhigh voltage and simultaneously realizes the function of overcurrent protection.
Further, the heating circuit 10 includes a heating wire H1, a temperature detection module 100 and an identification module IC 1; the input end of the heating wire H1 is connected with the protection sub-circuit 230, the output end of the heating wire H1 is connected with the negative electrode of a first power supply, and the temperature detection module 100 and the identification module IC1 are both connected with the protection sub-circuit 230 and the suppression sub-circuit 220; the temperature detection module 100 includes a first temperature detection device RV1 and a second temperature detection device RV2, one end of the first temperature detection device RV1, one end of the second temperature detection device RV2 and the identification module IC1 are all connected to the protection sub-circuit 230, and the other end of the first temperature detection device RV1, the other end of the second temperature detection device RV2 and the ground end of the identification module IC1 are all connected to the input end of the suppression sub-circuit 220 and the protection sub-circuit 230; the identification module IC1 is specifically an identification chip, and can store the temperature data detected by the temperature detection module 100 and upload the temperature data when needed by the main control module 30.
In this embodiment, the collecting sub-circuit 210 collects the input voltage of the protection sub-circuit 230 and transmits the collected input voltage to the suppressing sub-circuit 220; clamping the input voltage by the inhibitor sub-circuit 220 and discharging current through the bleed sub-circuit 240; short-circuit protection is performed by the protection sub-circuit 230 when the current is too high. The embodiment simultaneously realizes voltage clamping protection and overcurrent protection, so that the heating circuit 10 avoids overhigh voltage, simultaneously realizes the function of overcurrent protection, and avoids safety risks caused by instantaneous high-voltage triggering of electric sparks.
Further, referring to fig. 2, the collecting sub-circuit 210 includes a first diode D1, a second diode D2, and a third diode D3; the input end of the first diode D1, the input end of the second diode D2 and the input end of the third diode D3 are connected with the protection sub-circuit 230 and respectively collect a first input voltage, a second input voltage and a third input voltage; the output terminal of the first diode D1, the output terminal of the second diode D2, and the output terminal of the third diode D3 are all connected to the suppressor sub-circuit 220.
The conventional heating circuit 10 generally includes a plurality of IO ports, and the six IO ports are exemplified in the present embodiment, in which power is supplied to the heating wire H1, the temperature detection module 100, and the like, or communication is performed with the identification module IC 1. Specifically, the first IO port is connected to a first power supply positive electrode to supply power to the heating wire H1; the second IO port is connected with the negative electrode of the first power supply, so that the heating wire H1 forms a loop; the first input voltage supplies power to a first temperature detection device RV1 through a third IO port; the second input voltage supplies power to a second temperature detection device RV2 through a fourth IO port; the third input voltage is communicated with the identification module IC1 through a fifth IO port; the sixth IO port is used to ground the temperature sensing device and identification module IC 1. When the heating circuit 10 is powered on, the voltage values of the third IO port, the fourth IO port and the fifth IO port are respectively collected by the first diode D1, the second diode D2 and the third diode D3 and output to the suppressor circuit 220, and voltage clamping is realized by the suppressor circuit 220, so that even if the power-on instantaneous voltage is too high, the heating circuit 10 at the later stage is not burned out, and electric sparks are not generated.
Further, with reference to fig. 2, in the first embodiment of the present invention, the protection sub-circuit 230 includes: a first protection unit 231 for short-circuit protecting the heating wire H1; a second protection unit 232 for short-circuit protection of the temperature detection module 100 of the heating circuit 10; a third protection unit 233 for short-circuit protection of the bleeder sub-circuit 240; one end of the first protection unit 231 is connected to the input end of the heating wire H1, the other end of the first protection unit 231 is connected to a first power supply, one end of the second protection unit 232 is connected to the acquisition sub-circuit 210 and is connected to an input voltage, the other end of the second protection unit 232 is connected to the temperature detection module 100 and the identification module IC1 of the heating circuit 10, one end of the third protection unit 233 is connected to the suppression sub-circuit 220, and the other end of the third protection unit 233 is connected to the bleeding sub-circuit 240.
In specific implementation, in this embodiment, the first protection unit 231 performs overcurrent protection on the heating wire H1, and when the current is too high, the first protection unit 231 can break the loop of the heating wire H1, so that the heating wire H1 is powered off, thereby achieving an overcurrent protection effect.
Further, the first protection unit 231 includes a first resistor R1 and a first fuse F01; one end of the first fuse F01 is connected with one end of the first resistor R1, the other end of the first fuse F01 is connected with the input end of the heating wire H1, and the other end of the first resistor R1 is connected with the positive electrode of the first power supply; in the embodiment, the first fuse F01 is a self-recovery fuse, when the heater is short-circuited, the resistance of the first fuse F01 is increased to limit the current within a certain range, and after the fault is removed, the first fuse F01 is recovered to a normal state, so that the damage of the device due to the short-circuit of the heater can be effectively prevented.
Further, the second protection unit 232 includes a first fuse F1, a second fuse F2, and a third fuse F3, and the third protection unit 233 includes a fourth fuse F4; one end of the first fuse F1 is connected with the input end of the first diode D1 and is connected with a first input voltage; the other end of the first fuse tube F1 is connected with the temperature detection module 100; one end of the second fuse F2 is connected with the input end of the second diode D2 and is connected with a second input voltage; the other end of the second fuse tube F2 is connected with the temperature detection module 100; one end of the third fuse F3 is connected to the input end of the third diode D3 and is connected to a third input voltage; the other end of the third fuse tube F3 is connected with an identification module IC 1; one end of the fourth fuse F4 is connected to the positive terminal of the suppressor circuit 220, the temperature detection module 100, and the identification module IC1, and the other end of the fourth fuse F4 is connected to the bleeder circuit 240.
In this embodiment, the first fuse tube F1, the second fuse tube F2, the third fuse tube F3, and the fourth fuse tube F4 are all fused when the current is too large, so that the circuit is disconnected, and the purpose of overcurrent protection is achieved.
Further, the suppressor sub-circuit 220 includes a transient suppression diode TVS1, a negative terminal of the transient suppression diode TVS1 is connected to the output terminal of the first diode D1, the output terminal of the second diode D2, and the output terminal of the third diode D3, and a positive terminal of the transient suppression diode TVS1 is connected to one terminal of the third protection unit 233. In this embodiment, the transient suppression diode TVS1 receives the voltages collected by the first diode D1, the second diode D2, and the third diode D3, respectively, maintains the voltages at a predetermined value, outputs three currents to the fourth fuse F4, outputs the currents to the bleeder sub-circuit 240 through the fourth fuse F4, and discharges the currents to ground through the bleeder sub-circuit 240. It should be noted that the preset value of the clamping voltage of the transient suppression diode TVS1 can be set according to the requirement, and is not limited herein.
Further, the bleeder sub-circuit 240 includes a fourth diode D4, a third resistor R3 and a first switch tube Q1, an input end of the fourth diode D4 is connected to a control voltage, an output end of the fourth diode D4 is connected to one end of the third resistor R3 and a control end of the first switch tube Q1, an input end of the first switch tube Q1 is connected to the third protection unit 233, and an output end of the first switch tube Q1 is connected to the other end of the third resistor R3 and grounded.
In this embodiment, the fourth diode D4 is connected to a second power supply and outputs the second power supply to the control terminal of the first switch transistor Q1, and the first switch transistor Q1 is an NMOS transistor, so that the control terminal of the first switch transistor Q1 is a gate, the input terminal of the first switch transistor Q1 is a drain/source of the NMOS transistor, and the output terminal of the first switch transistor Q1 is a source/drain of the NMOS transistor. In the embodiment, the current is discharged to the ground through the output end of the first switching tube Q1 when the input end of the first switching tube Q1 is connected, so that the normal discharge of the current is realized. Optionally, the first switch tube Q1 may also be a PMOS tube or a triode, and only needs to implement a current bleeding function, which is not limited herein.
Further, the heating circuit protection circuit 20 further includes a temperature detection sub-circuit 250, the temperature detection sub-circuit 250 is connected to the second power supply, and an output end of the temperature detection sub-circuit 250 is connected to ground. Specifically, the temperature detection sub-circuit 250 includes a third temperature detection device RV3, and the third temperature detection device RV3 is used for detecting the temperature of the heating circuit protection circuit 20, and when the temperature of the heating circuit protection circuit is too high, the power off is controlled through the main control module 30, so that the phenomenon that the temperature of the heating circuit protection circuit 20 is too high and the protection effect is lost is avoided.
The first temperature detection device RV1, the second temperature detection device RV2, and the third temperature detection device RV3 may be temperature sensors, thermistors, and the like, and are not limited herein.
Further, referring to fig. 3, in a second embodiment of the present invention, the main control module 30 includes a first protection unit 31 for performing short-circuit protection on the heating wire, one end of the first protection unit 31 is connected to the power output end, and the other end of the first protection unit 31 is connected to the power input end; compared with the first embodiment, the first protection unit 31 may also be disposed in the main control module 30, in this embodiment, the main control module 30 is a main control board of the device, and the first protection unit 31 may be disposed in the heating circuit protection circuit to protect the heating circuit, or disposed inside the device to protect the heating circuit.
Further, the protection sub-circuit 230 includes a second protection unit 232 for performing short-circuit protection on the temperature detection module 100 of the heating circuit; a third protection unit 233 for short-circuit protection of the bleeder sub-circuit 240; one end of the second protection unit 232 is connected to the acquisition sub-circuit 210 and is connected to an input voltage, the other end of the second protection unit 232 is connected to the temperature detection module 100 and the identification module IC of the heating circuit 10, one end of the third protection unit 233 is connected to the suppressor sub-circuit 220, and the other end of the third protection unit 233 is connected to the bleeder sub-circuit 240; as in the first embodiment, the protection sub-circuit 230 in this embodiment includes a second protection unit 232 and a third protection unit 233, and specifically, the functional structures of the second protection unit 232 and the third protection unit 233 are the same as those in the first embodiment, and are not described herein again.
Further, the first protection unit 31 includes a second resistor R2 and a second fuse F02; one end of the second fuse F02 is connected to one end of the second resistor R2, the other end of the second fuse F02 is connected to the power output end, the other end of the second resistor R2 is connected to the power input end, in this embodiment, the power output end connected to the second fuse F02 is a positive electrode of the first power supply, and is also equivalent to the input end of the heating wire, except that in this embodiment, the first protection unit is disposed in a power line of the main control module 30, and the main control module 30 supplies power to the heating circuit through the power line; similarly, in the embodiment, the second fuse F02 is a self-recovery fuse, when the heater is short-circuited, the resistance of the second fuse F02 will increase, limiting the current to a certain range, and after the fault is removed, the first fuse F01 will return to the normal state, thereby effectively preventing the heater from being short-circuited to cause the damage of the device.
In summary, the present invention provides a breathing assistance device, which includes a main control module, a heating circuit, and a heating circuit protection circuit connected to the heating circuit, where the heating circuit protection circuit includes an acquisition sub-circuit, a suppression sub-circuit, a protection sub-circuit, and a bleeding sub-circuit; the acquisition sub-circuit acquires the input voltage of the protection sub-circuit and transmits the input voltage to the inhibition sub-circuit; clamping, by the suppressor sub-circuit, the input voltage and discharging current through the bleed sub-circuit; and carrying out short-circuit protection by the protection sub-circuit when the current is overhigh. According to the utility model, the voltage of the heating loop is monitored, the input voltage is inhibited through the inhibiting sub-circuit, the overvoltage protection is realized through voltage clamping, and the overcurrent protection is realized through the protecting sub-circuit when the current of the circuit is overhigh, so that the safety risk caused by triggering electric sparks at instantaneous high voltage is avoided.
It should be understood that the technical solutions and the inventive concepts according to the present invention may be equally replaced or changed by those skilled in the art, and all such changes or substitutions should fall within the protection scope of the appended claims.
Claims (8)
1. A breathing assistance device is characterized by comprising a main control module, a heating loop and a heating loop protection circuit connected with the heating loop, wherein the heating loop protection circuit comprises an acquisition sub-circuit, a suppression sub-circuit, a protection sub-circuit and a discharge sub-circuit; the acquisition sub-circuit acquires the input voltage of the protection sub-circuit and transmits the input voltage to the inhibition sub-circuit; clamping, by the suppressor sub-circuit, the input voltage and discharging current through the bleed sub-circuit; performing short-circuit protection by the protection sub-circuit when the current is overhigh;
the protection sub-circuit comprises a first protection unit for performing short-circuit protection on the heating wire, one end of the first protection unit is connected with the input end of the heating wire, and the other end of the first protection unit is connected to a first power supply;
the first protection unit comprises a first resistor and a first fuse; one end of the first fuse is connected with one end of the first resistor, the other end of the first fuse is connected with the input end of the heating wire, and the other end of the first resistor is connected with the positive electrode of the first power supply;
the first fuse is a self-healing fuse.
2. A breathing assistance apparatus as claimed in claim 1 wherein said acquisition sub-circuit includes a first diode, a second diode and a third diode; the input end of the first diode, the input end of the second diode and the input end of the third diode are connected with the protection sub-circuit and respectively collect a first input voltage, a second input voltage and a third input voltage; and the output end of the first diode, the output end of the second diode and the output end of the third diode are all connected with the suppressor sub-circuit.
3. A breathing assistance apparatus as claimed in claim 2 wherein said protection sub-circuit comprises:
the second protection unit is used for carrying out short-circuit protection on the temperature detection module of the heating loop;
the third protection unit is used for carrying out short-circuit protection on the bleeder sub-circuit;
one end of the second protection unit is connected with the acquisition sub-circuit and is connected with input voltage, the other end of the second protection unit is connected with the temperature detection module and the identification module of the heating loop, one end of the third protection unit is connected with the suppression sub-circuit, and the other end of the third protection unit is connected with the discharge sub-circuit.
4. The breathing assistance device of claim 2, wherein the main control module comprises a first protection unit for short-circuit protection of the heating wire, one end of the first protection unit is connected with the power output end, and the other end of the first protection unit is connected to the power input end.
5. A breathing assistance apparatus as claimed in claim 4 wherein said protection sub-circuit comprises: the second protection unit is used for carrying out short-circuit protection on the temperature detection module of the heating loop; the third protection unit is used for carrying out short-circuit protection on the bleeder sub-circuit; one end of the second protection unit is connected with the acquisition sub-circuit and is connected with input voltage, the other end of the second protection unit is connected with the temperature detection module and the identification module of the heating loop, one end of the third protection unit is connected with the suppression sub-circuit, and the other end of the third protection unit is connected with the discharge sub-circuit.
6. A breathing assistance apparatus as claimed in claim 4 wherein said first protection unit comprises a second resistor and a second fuse; one end of the second fuse is connected with one end of the second resistor, the other end of the second fuse is connected with the power output end, and the other end of the second resistor is connected with the power input end.
7. A breathing assistance apparatus according to claim 3 or 5 wherein said second protection unit comprises a first safety tube, a second safety tube and a third safety tube; one end of the first protective tube is connected with the input end of the first diode and is connected with a first input voltage; the other end of the first protective pipe is connected with the temperature detection module; one end of the second protective tube is connected with the input end of the second diode and is connected with a second input voltage; the other end of the second protective tube is connected with the temperature detection module; one end of the third protective tube is connected with the input end of the third diode and is connected with a third input voltage; the other end of the third protective tube is connected with the identification module.
8. A breathing assistance apparatus as claimed in claim 6 wherein said second fuse is a self-healing fuse.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121282401.2U CN216056321U (en) | 2021-06-08 | 2021-06-08 | Breathing auxiliary equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121282401.2U CN216056321U (en) | 2021-06-08 | 2021-06-08 | Breathing auxiliary equipment |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216056321U true CN216056321U (en) | 2022-03-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202121282401.2U Active CN216056321U (en) | 2021-06-08 | 2021-06-08 | Breathing auxiliary equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216056321U (en) |
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2021
- 2021-06-08 CN CN202121282401.2U patent/CN216056321U/en active Active
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