Negative pressure detection device

Abstract

The utility model relates to the technical field of negative pressure detection equipment, and provides a negative pressure detection device, which comprises a shell, a negative pressure meter and a detection module, a mounting space is formed in the shell, a negative pressure input port and a detection connecting port are formed in the shell, and the detection connecting port is communicated with the negative pressure input port through a pipeline; the negative pressure meter is connected with the detection connector and is used for displaying a negative pressure value; the detection module is arranged in the installation space, the detection module is connected with the negative pressure input port, and the detection module is used for prompting reading and giving an alarm when the negative pressure is unqualified. According to the utility model, the reading can be stably and accurately realized through the reminding of the detection module, the influence on the reading accuracy caused by the fluctuation of negative pressure is avoided, the reliability of the result of the detection device is improved, unqualified products can be intuitively and efficiently distinguished through the alarm of the detection module, the detection efficiency is improved, and the detection is more intuitive.

Description

Technical Field

[0001] The utility model relates to the technical field of negative pressure detection equipment, in particular to a negative pressure detection device. Background Art

[0002] A breast pump is a breastfeeding aid product used to generate suction to draw out the milk in the nipple. Generally, an electric breast pump sucks milk by setting multiple suction levels. In order to test whether the suction of the electric breast pump can reach the standard required for each level, it is necessary to test the suction of the breast pump. Suction is one of the key technical parameters when using a breast pump. If the suction is insufficient, it will lead to poor milk suction or even inability to draw out the milk.

[0003] In the related art, when manufacturing a breast pump, most use a mechanical pointer negative pressure gauge or a digital display negative pressure gauge to test the suction. Both of these methods are difficult to achieve efficient and intuitive detection, and the detection results are often limited by factors such as reading and display speed, which may affect the final detection results. Summary of the Utility Model

[0004] The utility model provides a negative pressure detection device to solve the defect that the accuracy of reading during the negative pressure detection of a breast pump in the prior art is low, resulting in low credibility of the detection results.

[0005] The utility model provides a negative pressure detection device, including: a housing, a negative pressure gauge, and a detection module; an installation space is formed inside the housing, a negative pressure input port and a detection connection port are provided on the housing, and the detection connection port is communicated with the negative pressure input port through a pipeline; the negative pressure gauge is connected to the detection connection port, and the negative pressure gauge is used to display the negative pressure value; the detection module is arranged in the installation space, the detection module is connected to the negative pressure input port, and the detection module is used to prompt the reading and issue an alarm when the negative pressure is unqualified.

[0006] According to the negative pressure detection device provided by the utility model, the detection module includes a control module and a pressure acquisition module, a key module, and an alarm module that are electrically connected to the control module. The pressure acquisition module is connected to the negative pressure input port, and the pressure acquisition module is used to acquire the change in negative pressure. The key module has multiple keys, and the key module is used to adjust the threshold range. The alarm module includes a buzzer, and the alarm module is used to prompt the reading after stabilization and to issue an alarm sound.

[0007] According to the negative pressure detection device provided by the utility model, the pressure acquisition module includes a voltage division circuit and a negative pressure sensor. The input end of the voltage division circuit is connected to the output end of the negative pressure sensor to collect the voltage value after voltage division of the output voltage of the negative pressure sensor.

[0008] According to the negative pressure detection device provided by the present utility model, the detection module further includes a display module, the display module is electrically connected to the control module, and the display module is used to display the suction curve.

[0009] According to the negative pressure detection device provided by the present utility model, the display module includes an LCD display screen.

[0010] According to the negative pressure detection device provided by the present utility model, the detection module further includes a control valve, the control valve is arranged on the pipeline between the detection connection port and the negative pressure input port, and the control valve is electrically connected to the control module.

[0011] According to the negative pressure detection device provided by the present utility model, the negative pressure detection device further includes a tee connector, the tee connector has an inlet end, a first outlet end and a second outlet end, the inlet end is connected to the negative pressure input port, the first outlet end is communicated with the pressure acquisition module through a pipeline, and the second outlet end is communicated with the detection connection port.

[0012] According to the negative pressure detection device provided by the present utility model, the negative pressure detection device further includes a connection fitting, the connection fitting is connected to the negative pressure input port through an external pipeline, and the connection fitting is used to connect to a negative pressure generator.

[0013] According to the negative pressure detection device provided by the present utility model, the connection fitting includes a main body portion in a flared shape, and a sealing interface is arranged on the main body portion, and the sealing interface is used to connect the pipeline.

[0014] According to the negative pressure detection device provided by the present utility model, the main body portion is a silicone part.

[0015] A negative pressure detection device provided by the present utility model can read stably and accurately through the reminder of the detection module, avoid affecting the accuracy of the reading due to the fluctuation of the negative pressure, improve the credibility of the detection result of the detection device, and can directly and efficiently identify unqualified products through the alarm of the detection module, improve the detection efficiency and make the detection more intuitive. Description of the Drawings

[0016] In order to more clearly illustrate the technical solutions in the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0017] Figure 1 It is a schematic connection structure diagram of the negative pressure detection device provided by the present utility model.

[0018] Figure 2 It is the structural block diagram of the negative pressure detection device provided by the present utility model.

[0019] Reference numerals:

[0020] 1. Housing; 11. Negative pressure input port; 12. Detection connection port; 2. Detection module; 21. Control module; 22. Pressure acquisition module; 23. Alarm module; 24. Button module; 25. Display module; 26. Electric control valve; 3. Negative pressure gauge; 4. Three-way connector; 5. Connection fitting. Specific embodiments

[0021] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the technical solutions in the present utility model will be clearly and completely described below with reference to the accompanying drawings in the present utility model. Apparently, the described embodiments are some but not all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0022] In the description of the embodiments of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and should not be construed as indicating or implying relative importance.

[0023] In the description of the embodiments of the present utility model, it should be noted that unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present utility model can be understood according to specific circumstances.

[0024] In the embodiments of the present utility model, unless otherwise clearly defined and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0025] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0026] A breast pump is a breastfeeding aid product used to generate suction to suck out the milk in the nipple. Usually, a breast pump has multiple suction intensity adjustments to achieve different suction forces. In the related art, manufacturers usually use pointer-type or digital display methods for detection. When using a mechanical pointer negative pressure gauge, the measurement is inaccurate, and only approximate suction can be measured. It cannot accurately measure because the residence time of the highest suction indication is extremely short, which requires a high level of skill from workers and is also likely to cause visual fatigue for workers. When using a digital display negative pressure gauge for testing, due to the different sampling and display speeds of different negative pressure gauges, a changing pressure cannot be accurately measured, and there will be problems with incorrect test results.

[0027] Regarding the problems in the related art, such as Figure 1As shown in the figure, the present utility model provides a negative pressure detection device, which includes a housing 1, a negative pressure gauge 3, and a detection module 2; an installation space is formed inside the housing 1, a negative pressure input port 11 and a detection connection port 12 are provided on the housing 1, and the detection connection port 12 is communicated with the negative pressure input port 11 through a pipeline; the negative pressure gauge 3 is connected to the detection connection port 12, and the negative pressure gauge 3 is used to display the negative pressure value; the detection module 2 is arranged in the installation space, the detection module 2 is connected to the negative pressure input port 11, and the detection module 2 is used to prompt the reading and give an alarm when the negative pressure is unqualified. When detecting a negative pressure generating device, it is necessary to determine whether the actual negative pressure generated at each gear can reach the corresponding design value. In this embodiment, the negative pressure gauge 3 can realize negative pressure detection, and the reading through the reminder of the detection module 2 can be more accurate and stable, and an alarm is given for unqualified negative pressure to improve the detection efficiency and accuracy.

[0028] In this example, the negative pressure detection device can be applied to the detection of any negative pressure generator, especially suitable for the detection of breast pumps. This embodiment takes a breast pump as an example for detailed description. Specifically, a negative pressure detection device for a breast pump can achieve efficient and rapid detection through the prompt and alarm of the detection module 2, and the overall detection result is more accurate and has a higher credibility.

[0029] It can be understood that a breast pump has multiple gears, and the suction force of each gear is different. In the traditional method, the accuracy of reading through the mechanical pointer method cannot be stably guaranteed, and the digital display reading has poor stability due to the suction force fluctuation and the display speed difference, resulting in low credibility of the final result. In this embodiment, through the setting of the detection module 2, a prompt can be issued after the suction force is stable, and stable and accurate reading can be achieved by reading after hearing the prompt, improving the accuracy and reliability of the reading. And during the detection process, once the suction force does not reach or exceeds the predetermined threshold range, an alarm can be issued, thus realizing intuitive and efficient detection and improving the detection efficiency.

[0030] During the specific operation process, the detection module 2 can realize the real-time change of the pressure during the sensing process through the set pressure detection element, and can sense the maximum pressure point of the measured pressure through the pressure detection element. Mechanical switch linkage control can be adopted on the passage connected to the negative pressure gauge 3. That is, when the sensing element senses that the pressure reaches the maximum pressure point, an electrical signal will be generated, and the mechanical switch will be linked to control the closing of the connection path of the negative pressure gauge 3, so as to ensure the stable display of the negative pressure gauge at each gear and achieve the convenient display of the maximum pressure value at each gear.

[0031] In specific implementation, a strain gauge can be used to sense the pressure, and the pressure can be calculated through the deformation degree of the strain gauge. When the sensing is stable and the maximum deformation of each gear is reached, the mechanical switch or electronic switch is controlled to close the path connected to the negative pressure gauge 3. At this time, the negative pressure gauge displays the maximum pressure value under the current gear, thereby realizing a stable display of the maximum pressure value.

[0032] Specifically, Figure 1 As shown, in this embodiment, by arranging the detection module 2 and various components in the housing 1, the overall layout of the components is compact, so that the entire detection device has a simple structure and occupies a small volume.

[0033] In the specific setting, the negative pressure meter 3 can be a digital display meter. After detecting that the negative pressure is stable, the detection module 2 emits a prompt sound to remind the staff to take readings. At this time, the negative pressure tends to be stable, and accurate and stable readings of the negative pressure can be achieved to improve the accuracy of the readings.

[0034] According to an embodiment provided by the utility model, the detection module 2 includes a control module 21 and a pressure collection module 22, a button module 24 and an alarm module 23 electrically connected to the control module 21. The pressure collection module 22 is connected to the negative pressure input port 11. The pressure collection module 22 is used to collect negative pressure changes. The button module 24 has multiple buttons, and the button module 24 is used to adjust the threshold range. The alarm module 23 includes a buzzer, and the alarm module 23 is used to prompt the reading after stabilization and to emit an alarm sound. The accuracy of negative pressure detection is directly related to the negative pressure value of the specific detection reading. During the specific detection, since the negative pressure often has a certain volatility, it is difficult to ensure the stability of the accuracy of the method of directly connecting the negative pressure meter 3 to read. In this embodiment, the pressure can be collected synchronously through the pressure collection module 22, and the alarm module 23 can prompt the reading to avoid the error caused by reading when the fluctuation is large, thereby improving the accuracy of the reading.

[0035] Specifically, the pressure acquisition module 22, the button module 24 and the alarm module 23 are all electrically connected to the control module 21. The control module 21 can control the alarm module 23 and other actuators to act according to the collected data of the pressure acquisition module 22 and the setting data of the button module 24, so as to realize efficient and quick detection of negative pressure.

[0036] Among them, the buzzer can emit different prompt sounds. In this embodiment, there are at least two prompt sounds. One is to issue a prompt when the negative pressure is unqualified to indicate that the negative pressure generated by the negative pressure generator tested this time is unqualified. When the tested negative pressure is qualified and the negative pressure is within a stable range, a prompt can be issued to remind the staff to read the readings, improve the accuracy of the readings, and improve the accuracy and credibility of the test. Specifically, different beeps can be distinguished by short beeps and long beeps. When a prompt sound is issued, it is a short beep, and when an alarm is issued, it is a long beep.

[0037] The button module 24 has a plurality of physical buttons, which are used to adjust the detection range of the suction alarm. That is, different alarm ranges can be provided at different gears, thereby achieving efficient and accurate detection.

[0038] In a specific embodiment, a voltage threshold can be set, and different negative pressures can obtain different voltage values through the pressure acquisition module 22, thereby reflecting different suction sizes. And in a specific test, the pressure acquisition module 22 can sense the maximum pressure point of the pressure change under stable conditions, so that it can be linked with a mechanical switch or an electronic switch to control the path connected to the negative pressure meter 3, and realize effective sensing of the maximum pressure value. For example, a voltage threshold is set by setting a comparator circuit, and then the real-time detected voltage is compared with the voltage threshold, so as to feedback a control signal. Of course, it is also possible to combine the existing software control program to set a proxy in the control module 21 to set and modify the threshold. This method can be more flexible to adjust and improve the applicability of the detection device.

[0039] It can be understood that, compared with the traditional method that requires specific reading of the negative pressure value to compare whether it has reached the design value or exceeded the design value, on the one hand, in this embodiment, the threshold adjustment can be achieved through the key module 24, and based on the threshold, it can be fed back whether the detected negative pressure is within the threshold range. When the real-time detected negative pressure is not within the threshold range, an alarm is sounded through a buzzer to remind the staff that the negative pressure generator detected this time is unqualified, thereby improving the detection efficiency.

[0040] On the other hand, the pressure collection module 22 can collect negative pressure changes, so that a buzzer can be used to issue a prompt sound when the negative pressure is stable, and the reading can be accurately grasped when the negative pressure is stable, thereby improving the accuracy of the reading.

[0041] In a specific example, the pressure acquisition module 22 includes a voltage dividing circuit and a negative pressure sensor. The negative pressure sensor is connected to the negative pressure input port 11, and the input end of the voltage dividing circuit is connected to the output end of the negative pressure sensor for acquiring the voltage value after voltage division of the output voltage of the negative pressure sensor. The negative pressure sensor can acquire negative pressure, and its main function is to convert a physical signal into an electrical signal to represent a specific pressure change through the change of the electrical signal.

[0042] Specifically, in this embodiment, the specific ways of the negative pressure sensor and the voltage dividing circuit are common pressure detection technologies in the art, so the specific connection and installation methods will not be introduced in detail.

[0043] According to an embodiment provided by the present invention, the detection module 2 further includes a display module 25. The display module 25 is electrically connected to the control module 21, and the display module 25 is used to display the suction curve. The display module 25 can display the suction curve and emit a prompt sound when the fluctuation of the suction curve tends to be stable for reading the negative pressure value, thereby improving the accuracy of reading.

[0044] In a specific example, the display module 25 includes an LCD display screen. The LCD display screen has low energy consumption and high display clarity, which can meet the needs of displaying the suction curve. Of course, the display module 25 can also be an LED display screen.

[0045] According to an embodiment provided by the present invention, the detection module 2 further includes a control valve. The control valve is arranged on the pipeline between the detection connection port 12 and the negative pressure input port 11, and the control valve is electrically connected to the control module 21. The control valve is arranged on the connection path of the negative pressure gauge 3. By controlling this path, the path can be closed when the negative pressure is stable, so as to achieve stable and accurate reading.

[0046] It can be understood that initially, the negative pressure fluctuations generated by the breast pump at each gear are relatively large, and reading at this time will result in low reading accuracy, and there is no component for stability judgment in the traditional solution. In this embodiment, the detection module 2 is used to judge the suction stability, emit a prompt sound to remind the staff to read when it is stable, and at the same time control the electric control valve 26 to close the pipeline connected to the entire negative pressure gauge 3, so that the negative pressure gauge 3 has a stable and accurate reading, improving the overall reading accuracy and stability.

[0047] For example, such as Figure 1 、 Figure 2As shown in the figure, the control module 21 selects a 32-bit microcontroller (MCU). This microcontroller has a first input terminal, a second control terminal, a third control terminal, a fourth control terminal, and a fifth control terminal. The first input terminal is connected to the pressure acquisition module 22 to obtain the pressure value collected by the pressure acquisition module 22. Specifically, it is connected to the first control terminal Pressure through a negative pressure sensor, and the data information is transmitted into the microcontroller for processing. The electric control valve 26 is connected to the second control terminal Valve to control the opening or closing of the electric control valve 26. The display module 25 is connected to the third control terminal Display to display the current suction condition (specifically, display the suction curve). The alarm module 23 is connected to the fourth control terminal Warning to prompt the user to take readings after the breast pump is stable, and can also give real-time alarms for unqualified suction conditions. The key module 24 is connected to the fifth control terminal Key to adjust the monitoring range of the suction alarm.

[0048] The specific working principle is as follows: When the breast pump host starts to work, it collects the voltage value after voltage division of the output voltage of the negative pressure sensor through the pressure acquisition module 22, and transmits this voltage value to the control module 21. After the control module 21 processes the data, it displays the suction curve through the display module 25. When the key module 24 sets the suction alarm to a certain suction limit range, the control module 21 makes a judgment based on the received suction data, so as to realize different suction limit judgments for different gears of the breast pump. At the same time, it controls the alarm module 23 by outputting a qualified or unqualified suction signal. When the suction is unqualified, a long beeping sound is emitted by the buzzer for alarm. The control module 21 judges the working condition of the breast pump host according to the received suction data. After stable operation, it transmits the data to the electric control valve 26 to realize the opening and closing of the electric control valve 26, and a short beeping sound is emitted by the buzzer module to prompt the user to read the value, which is convenient for the user to read the value.

[0049] According to an embodiment provided by the present invention, the negative pressure detection device further includes a three-way connector 4. The three-way connector 4 has an inlet end, a first outlet end, and a second outlet end. The inlet end is connected to the negative pressure input port 11, the first outlet end is communicated with the pressure acquisition module 22 through a pipeline, and the second outlet end is communicated with the detection connection port 12. Through the setting of the three-way joint, the overall structure is more compact, the overall volume occupation of the device can be reduced, and the compact layout of the device can be realized.

[0050] In an embodiment provided by the present utility model, the negative pressure detection device further includes a connection fitting 5. The connection fitting 5 is connected to the negative pressure input port 11 through an external pipeline, and the connection fitting 5 is used to connect to a negative pressure generator. When detecting a breast pump, it needs to be connected to the main body of the breast pump. In this embodiment, through the setting of the connection fitting 5, rapid and efficient connection with the main body of the breast pump can be achieved, so as to realize the convenience of connection and facilitate rapid connection.

[0051] Specifically, the connection fitting 5 includes a main body portion in a flared shape structure. A sealing interface is provided on the main body portion, and the sealing interface is used to connect the pipeline. Usually, the suction port of a breast pump is in a flared shape structure. In this embodiment, by setting the main body portion to also be in a flared shape structure, it is convenient to cooperate with the mouth portion of the breast pump to achieve rapid and efficient connection.

[0052] In an embodiment provided by the present utility model, the main body portion is a silicone part. The setting of the silicone part can facilitate connection with the main body of the breast pump to be tested. When specifically connecting, the flared mouth of the connection fitting 5 is sealed with a silicone jig, and connection with the pipeline is achieved through the sealing interface. The pipeline can realize the communication between the main body of the breast pump and the negative pressure input port 11.

[0053] Through the description of the above embodiments, those skilled in the art can clearly understand that in each embodiment, the collected pressure is converted into a voltage value through the pressure acquisition module 22, and the control module 21 outputs the corresponding suction force by calculating the voltage value transmitted by the pressure acquisition module 22. In addition, this inspection tool has functions of prompting and alarming, which is convenient for users to timely master the suction force situation. This detection device can either display the suction force curve or the suction force value through the display screen, or detect the suction force by connecting a negative pressure gauge 3, which is convenient for various users to use and improves the overall applicability. Further, on the basis of using the negative pressure gauge 3, a pressure detection part and an electromagnetic control valve 26 are added to ensure that when the pressure is stable and the maximum suction force of each gear is reached, the passage between the negative pressure input port 11 and the negative pressure gauge 3 is closed, so that the negative pressure gauge 3 displays a stable pressure, and the stable sensing of the maximum pressure value at each gear is realized. On the premise of saving costs, the accuracy of the inspection result is also ensured.

[0054] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A negative pressure detection device, characterized in that, Comprising: A housing, an installation space is formed inside the housing, a negative pressure input port and a detection connection port are provided on the housing, and the detection connection port is communicated with the negative pressure input port through a pipeline; A negative pressure gauge, the negative pressure gauge is connected to the detection connection port, and the negative pressure gauge is used to display the negative pressure value; A detection module, the detection module is arranged in the installation space, the detection module is connected to the negative pressure input port, and the detection module is used to prompt the reading and issue an alarm when the negative pressure is unqualified.

2. The negative pressure detection device according to claim 1, wherein The detection module includes a control module and a pressure acquisition module, a key module and an alarm module electrically connected to the control module. The pressure acquisition module is connected to the negative pressure input port, and the pressure acquisition module is used to acquire the change of negative pressure. The key module has a plurality of keys, and the key module is used to adjust the threshold range. The alarm module includes a buzzer, and the alarm module is used to prompt the reading after stabilization and to issue an alarm sound.

3. The negative pressure detection device according to claim 2, characterized in that, The pressure acquisition module includes a voltage dividing circuit and a negative pressure sensor, and the input end of the voltage dividing circuit is connected to the output end of the negative pressure sensor to collect the voltage value after voltage division of the output voltage of the negative pressure sensor.

4. The negative pressure detection device according to claim 2, characterized in that, The detection module further includes a display module, the display module is electrically connected to the control module, and the display module is used to display the suction curve.

5. The negative pressure detection device according to claim 4, characterized in that, The display module includes an LCD display screen.

6. The negative pressure detection device according to claim 2, characterized in that, The detection module further includes a control valve, the control valve is arranged on the pipeline between the detection connection port and the negative pressure input port, and the control valve is electrically connected to the control module.

7. The negative pressure detection device according to claim 2, characterized in that, The negative pressure detection device further includes a three-way connector, the three-way connector has an inlet end, a first outlet end and a second outlet end. The inlet end is connected to the negative pressure input port, the first outlet end is communicated with the pressure acquisition module through a pipeline, and the second outlet end is communicated with the detection connection port.

8. The negative pressure detection device according to claim 1, characterized in that, The negative pressure detection device further includes a connection fitting, the connection fitting is connected to the negative pressure input port through an external pipeline, and the connection fitting is used to connect to a negative pressure generator.

9. The negative pressure detection device according to claim 8, characterized in that, The connection fitting includes a main body portion in a flared shape, and a sealing interface is provided on the main body portion, and the sealing interface is used to connect the pipeline.

10. The negative pressure detection device according to claim 9, characterized in that, The main body portion is a silicone member.

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