Negative pressure automatic compensation pressure system

Abstract

The invention relates to the technical field of medical instruments, in particular to a negative pressure automatic compensation pressure system which comprises a first negative pressure source unit, a first filter, a negative pressure compensator, a pressure detector, a negative pressure tank / check tank, a second filter and a second negative pressure source unit. The first negative pressure source unit and the second negative pressure source unit are original negative pressure, air of the first negative pressure source unit flows out of the compressor, passes through the first filter and then reaches the negative pressure tank / non-return tank, similarly, air of the second negative pressure source unit passes through the second filter and reaches the negative pressure tank / non-return tank, and the original negative pressure reaches the negative pressure compensator through a pipeline. The constant working negative pressure is kept under the condition that the compressor continuously works, the system has good stability within a certain elastic deformation range through the negative pressure compensator, pressure changes can be automatically responded, the system is not affected by signal processing lag and interference after the negative pressure value is adjusted, and the control process is simple, rapid and efficient.

Description

Technical Field

[0001] The present invention relates to the technical field of medical devices, and particularly to a negative pressure automatic compensation pressure system. Background Art

[0002] During the overall design process of medical devices, there is a need for negative pressure applications, especially for instruments with an independent air source unit. Whether the negative pressure regulation response is rapid and stable has become a key requirement in the operation of the instrument. Currently, the control method mainly involves using a pressure sensor to continuously read and monitor the negative pressure in the gas storage tank in real time. When the signal of the pressure sensor changes beyond the set value range, the controller issues an instruction to delay the pressure compensation by controlling the pump and valve to achieve the purpose of compensating the pressure.

[0003] However, due to factors such as the signal of the pressure sensor and the action delay of the pump and valve, there are uncertain factors in pressure stability, and there is a risk of exceeding the set value. Summary of the Invention

[0004] The purpose of the present invention is to provide a negative pressure automatic compensation pressure system, aiming to solve the problem that in the negative pressure compensation of traditional medical devices, due to factors such as the signal of the pressure sensor and the action delay of the pump and valve, there are uncertain factors in pressure stability, and there is a risk of exceeding the set value.

[0005] To achieve the above purpose, the present invention provides a negative pressure automatic compensation pressure system, including a first negative pressure source unit, a first filter, a negative pressure compensator, a pressure detector, a negative pressure tank / check valve tank, a second filter, and a second negative pressure source unit; the first negative pressure source unit, the first filter, the negative pressure compensator, and the negative pressure tank / check valve tank are connected in sequence, the pressure detector is connected to the negative pressure compensator, and the second negative pressure source unit, the second filter, and the negative pressure tank / check valve tank are connected in sequence.

[0006] Among them, the negative pressure compensator includes a lower cover, a corrugated pipe fitting, a nut, a housing, an adjusting thimble, an adjusting nut, and a mounting member. The lower cover is arranged on one side of the mounting member, the nut is arranged on the side of the mounting member away from the lower cover, the housing is fixedly connected to the lower cover and is located on the side of the lower cover away from the mounting member, the corrugated pipe fitting is fixedly connected to the lower cover and penetrates through the lower cover and the mounting member, the adjusting thimble is slidably connected to the housing and penetrates through the housing, and the adjusting nut is threadedly connected to the housing and is located on the side of the housing away from the lower cover.

[0007] Among them, the negative pressure compensator further includes filter cotton, and the filter cotton is fixedly connected to the housing and is located on the inner wall of the housing.

[0008] Among them, the corrugated pipe fitting includes an elastic corrugated pipe, a corrugated pipe nozzle, and a corrugated pipe valve nozzle. The corrugated pipe nozzle is arranged on one side of the lower cover. The elastic corrugated pipe is fixedly connected to the corrugated pipe nozzle and is located at the top of the corrugated pipe nozzle. The corrugated pipe valve nozzle is fixedly connected to the elastic corrugated pipe and is located on the side of the elastic corrugated pipe away from the corrugated pipe nozzle.

[0009] Among them, the negative pressure tank / check valve tank includes a tank body, a cover plate, a suction nozzle, a sealing ring, a floating ball, a nozzle, a support plate, and a negative pressure interface. The cover plate is fixedly connected to the tank body and is located on one side of the tank body. The support plate is fixedly connected to the cover plate and is located on the side of the cover plate away from the tank body. The nozzle is fixedly connected to the cover plate and penetrates through the cover plate and the support plate. The negative pressure interface is communicated with the cover plate and penetrates through the support plate. The sealing ring is fixedly connected to the cover plate and is located on the side of the cover plate close to the tank body. The suction nozzle is arranged on one side of the nozzle. The floating ball is communicated with the suction nozzle and is located inside the tank body.

[0010] In a negative pressure automatic compensation pressure system of the present invention, the first negative pressure source unit and the second negative pressure source unit are original negative pressures, generally -80 KPa negative pressure. After the air at the OPEN end of the first negative pressure source unit flows out of the compressor, it reaches the negative pressure tank / check valve tank through the first filter. Similarly, the air at the OPEN end of the second negative pressure source unit reaches the negative pressure tank / check valve tank through the second filter. The first filter and the second filter are used to filter large particulate matter in the air to prevent these impurities from clogging the compressor or the subsequent valves and pipelines, and at the same time, they also play a role in noise reduction. The setting of the negative pressure tank / check valve tank is used for gas-liquid separation to prevent liquid from other pipelines from entering the compressor to protect the air pump. At the same time, it has a certain volume itself, can provide a relatively stable negative pressure to reduce pressure fluctuations. The original negative pressure reaches the negative pressure compensator through pipelines, so as to maintain a constant working negative pressure when the compressor is continuously working. A pressure detector is connected between the negative pressure compensator and the working negative pressure. The pressure detector is used to monitor the negative pressure dynamics and timely feedback abnormal pressures. All components of this system are connected through pipelines, mainly in the form of PVC air pipes and tee joints, etc. The connection lengths and layouts of each pipeline can be adjusted according to the space and actual application. The negative pressure compensator has good stability within a certain elastic deformation range, automatically responds to pressure changes, and after setting the negative pressure value, the device is not affected by signal processing lag and interference, has good adaptability, the control process is simple, rapid and efficient, there is no need for a complex signal processing communication process between the independent air source and the instrument host, and the independent air source does not need to be equipped with a control circuit, which solves the problem that the negative pressure compensation of traditional medical devices has uncertain factors in pressure stability and the risk of exceeding the set value due to factors such as pressure sensor signals, pump and valve action delays. Description of the Drawings

[0011] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0012] Figure 1 It is a schematic connection diagram of a negative pressure automatic compensation pressure system provided by the present invention.

[0013] Figure 2 It is a front view of a negative pressure compensator of a negative pressure automatic compensation pressure system provided by the present invention.

[0014] Figure 3 It is an internal cross-sectional view of the negative pressure compensator provided by the present invention.

[0015] Figure 4 It is a schematic diagram of a corrugated pipe fitting provided by the present invention.

[0016] Figure 5 It is a front view of a negative pressure tank / check valve tank of a negative pressure automatic compensation pressure system provided by the present invention.

[0017] Figure 6 It is an internal cross-sectional view of the negative pressure tank / check valve tank provided by the present invention.

[0018] In the figure: 1 - First negative pressure source unit, 2 - First filter, 3 - Negative pressure compensator, 4 - Pressure detector, 5 - Negative pressure tank / check valve tank, 6 - Second filter, 7 - Second negative pressure source unit, 8 - Lower cover, 9 - Corrugated pipe fitting, 10 - Nut, 11 - Housing, 12 - Adjusting thimble, 13 - Adjusting nut, 14 - Mounting part, 15 - Filter cotton, 16 - Elastic corrugated pipe, 17 - Corrugated pipe nozzle, 18 - Corrugated pipe valve nozzle, 19 - Tank body, 20 - Cover plate, 21 - Suction nozzle, 22 - Sealing ring, 23 - Floating ball, 24 - Nozzle, 25 - Support plate, 26 - Negative pressure interface. Detailed implementation manners

[0019] The following will describe in detail the embodiments of the present invention. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention, and should not be construed as a limitation of the present invention.

[0020] Please refer to Figures 1 to 6, the present invention provides a negative pressure automatic compensation pressure system, comprising a first negative pressure source unit 1, a first filter 2, a negative pressure compensator 3, a pressure detector 4, a negative pressure tank / check valve tank 5, a second filter 6 and a second negative pressure source unit 7; the first negative pressure source unit 1, the first filter 2, the negative pressure compensator 3 and the negative pressure tank / check valve tank 5 are connected in sequence, the pressure detector 4 is connected to the negative pressure compensator 3, and the second negative pressure source unit 7, the second filter 6 and the negative pressure tank / check valve tank 5 are connected in sequence.

[0021] In an embodiment of the present invention, the first negative pressure source unit 1 and the second negative pressure source unit 7 are original negative pressures, generally -80 KPa negative pressure. After the air at the OPEN end of the first negative pressure source unit 1 flows out of the compressor, it reaches the negative pressure tank / check valve tank 5 after passing through the first filter 2. Similarly, the air at the OPEN end of the second negative pressure source unit 7 reaches the negative pressure tank / check valve tank 5 after passing through the second filter 6. The first filter 2 and the second filter 6 are used to filter large particulate matter in the air, avoiding these impurities from clogging the compressor or the subsequent valves and pipelines, and at the same time playing a role in noise reduction. The negative pressure tank / check valve tank 5 is provided for gas-liquid separation, preventing liquid from other pipelines from entering the compressor to protect the air pump. At the same time, it has a certain volume itself, which can provide a relatively stable negative pressure to reduce pressure fluctuations. The original negative pressure reaches the negative pressure compensator 3 through pipelines, so as to maintain a constant working negative pressure when the compressor is continuously working. A pressure detector 4 is connected between the negative pressure compensator 3 and the working negative pressure. The pressure detector 4 is used to monitor the negative pressure dynamics and timely feedback abnormal pressures. All components of this system are connected through pipelines, mainly in the form of PVC air pipes and three-way joints, etc. The connection lengths and layouts of each pipeline can be adjusted according to the space and actual application. The negative pressure compensator 3 has good stability within a certain elastic deformation range, automatically responds to pressure changes, and after setting the negative pressure value, the device is not affected by signal processing lag and interference, has good adaptability, the control process is simple, rapid and efficient, without the need for a complex signal processing communication process between an independent air source and the instrument host, and the independent air source does not need to be equipped with a control circuit, solving the problem of negative pressure compensation of traditional medical devices, where due to factors such as pressure sensor signals, pump and valve action delays, there are uncertain factors in pressure stability and a risk of exceeding the set value.

[0022] Further, the negative pressure compensator 3 includes a lower cover 8, a corrugated pipe fitting 9, a nut 10, a housing 11, an adjusting thimble 12, an adjusting nut 13, a mounting member 14 and a filter cotton 15. The lower cover 8 is disposed on one side of the mounting member 14, the nut 10 is disposed on the side of the mounting member 14 away from the lower cover 8, the housing 11 is fixedly connected to the lower cover 8 and is located on the side of the lower cover 8 away from the mounting member 14. The corrugated pipe fitting 9 is fixedly connected to the lower cover 8 and penetrates through the lower cover 8 and the mounting member 14. The adjusting thimble 12 is slidably connected to the housing 11 and penetrates through the housing 11. The adjusting nut 13 is threadedly connected to the housing 11 and is located on the side of the housing 11 away from the lower cover 8. The filter cotton 15 is fixedly connected to the housing 11 and is located on the inner wall of the housing. The corrugated pipe fitting 9 includes an elastic corrugated pipe 16, a corrugated pipe nozzle 17 and a corrugated pipe valve nozzle 18. The corrugated pipe nozzle 17 is disposed on one side of the lower cover 8. The elastic corrugated pipe 16 is fixedly connected to the corrugated pipe nozzle 17 and is located on the top of the corrugated pipe nozzle 17. The corrugated pipe valve nozzle 18 is fixedly connected to the elastic corrugated pipe 16 and is located on the side of the elastic corrugated pipe 16 away from the corrugated pipe nozzle 17.

[0023] In an embodiment of the present invention, the lower cover 8 and the housing 11 form a compensator housing, which is fixed to the mounting member 14 by the nut 10. The corrugated pipe member 9 is used to sense the change of the internal pressure of the system. Specifically, the corrugated pipe nozzle 18 and the corrugated pipe nozzle 18 are connected with pressure through holes. The corrugated pipe nozzle 18 cooperates with the adjusting thimble 12. The corrugated pipe nozzle 17 is connected to a negative pressure air source. The elastic corrugated pipe 16 is a thin-walled steel pipe, which can be understood as a closed spring and can make corresponding compensation according to the pressure change. When the internal pressure difference of the system exceeds or is lower than the set standard value, the elastic corrugated pipe 16 is in a compressed state to balance its pressure. When the internal pressure of the system exceeds the standard value, the elastic corrugated pipe 16 will reduce the pressure, thereby reducing the system pressure; when the required pressure in the system is lower than the standard value, the elastic corrugated pipe 16 will increase the pressure, thereby increasing the system pressure. The key structure of the elastic corrugated pipe 16 lies in the thin-walled corrugated pipe structure, which cooperates with the adjusting thimble 12. By setting the required value, the compression amount of the thin-walled corrugated pipe is adjusted to control the pressure difference. The characteristic of the elastic corrugated pipe 16 is that there is an eccentricity between the adjusting thimble 12 and the thin-walled corrugated pipe. The existence of the eccentricity can effectively prevent the adjusting thimble 12 from jamming with the small hole of the elastic corrugated pipe 16 during operation. In the actual use process, the small hole of the elastic corrugated pipe 16 can be adaptively adjusted to cooperate with the adjusting thimble 12 to achieve sealing. When the negative pressure exceeds the set value, the air pressure difference with the atmosphere will press down the elastic corrugated pipe 16. At this time, there is a gap between the adjusting thimble 12 and the adjusting thimble 12, and air quickly enters the elastic corrugated pipe 16. When the negative pressure reaches the set value, the pressure difference and the elastic deformation of the elastic corrugated pipe 16 are balanced again, and the gap between the adjusting thimble 12 and the elastic corrugated pipe 16 is closed.

[0024] Further, the negative pressure tank / check valve tank 5 includes a tank body 19, a cover plate 20, a suction nozzle 21, a sealing ring 22, a floating ball 23, a nozzle 24, a support plate 25 and a negative pressure interface 26. The cover plate 20 is fixedly connected to the tank body 19 and is located on one side of the tank body 19. The support plate 25 is fixedly connected to the cover plate 20 and is located on the side of the cover plate 20 away from the tank body 19. The nozzle 24 is fixedly connected to the cover plate 20 and penetrates through the cover plate 20 and the support plate 25. The negative pressure interface 26 is communicated with the cover plate 20 and penetrates through the support plate 25. The sealing ring 22 is fixedly connected to the cover plate 20 and is located on the side of the cover plate 20 close to the tank body 19. The suction nozzle 21 is arranged on one side of the nozzle 24. The floating ball 23 is communicated with the suction nozzle 21 and is located inside the tank body 19.

[0025] In the embodiment of the present invention, the negative pressure tank / check valve tank 5 is used for gas-liquid separation and providing a relatively stable negative pressure. During normal use, its main function is to be a negative pressure stable buffer bottle, which can play a buffering role to ensure that it can buffer when the load is large during individual periods, so as not to impact the pump load. The tank body 19 and the cover plate 20 form the outer shell of the negative pressure tank / check valve tank 5. The setting of the sealing ring 22 is used to strengthen the airtightness between the tank body 19 and the cover plate 20 and improve the sealing effect. The support plate 25 is used to connect the outer shell of the negative pressure tank / check valve tank 5 to the rest of the system mechanism. The negative pressure interface 26 is connected to the original negative pressure. When an abnormal situation occurs in the system pipeline, the liquid will flow into the negative pressure direction. Since the negative pressure of the compressor is the largest, there is a risk that the liquid will enter the compressor. When a certain amount of liquid enters the negative pressure tank / check valve tank 5, when the floating ball 23 floats up to reach the suction nozzle 21, the two are instantaneously sealed, thus avoiding the liquid from directly entering the compressor and realizing the function of protecting the compressor.

[0026] The above-disclosed is only a preferred embodiment of a negative pressure automatic compensation pressure system of the present invention. Of course, the scope of the rights of the present invention cannot be limited thereby. Those of ordinary skill in the art can understand all or part of the processes of implementing the above embodiments, and the equivalent changes made according to the claims of the present invention still fall within the scope covered by the invention.

Claims

1. A negative pressure automatic compensation pressure system, characterized in that ； It includes a first negative pressure source unit, a first filter, a negative pressure compensator, a pressure detector, a negative pressure tank / check valve tank, a second filter and a second negative pressure source unit; The first negative pressure source unit, the first filter, the negative pressure compensator and the negative pressure tank / check valve tank are connected in sequence. The pressure detector is connected to the negative pressure compensator. The second negative pressure source unit, the second filter and the negative pressure tank / check valve tank are connected in sequence.

2. The negative pressure automatic compensation pressure system according to claim 1, wherein ； The negative pressure compensator includes a lower cover, a corrugated pipe fitting, a nut, a housing, an adjusting thimble, an adjusting nut and a mounting member. The lower cover is arranged on one side of the mounting member. The nut is arranged on the side of the mounting member away from the lower cover. The housing is fixedly connected to the lower cover and is located on the side of the lower cover away from the mounting member. The corrugated pipe fitting is fixedly connected to the lower cover and penetrates through the lower cover and the mounting member. The adjusting thimble is slidably connected to the housing and penetrates through the housing. The adjusting nut is threadedly connected to the housing and is located on the side of the housing away from the lower cover.

3. The negative pressure automatic compensation pressure system according to claim 1, wherein ； The negative pressure compensator further includes filter cotton, and the filter cotton is fixedly connected to the inner wall of the housing and is located inside the housing.

4. The negative pressure automatic compensation pressure system according to claim 2, wherein; The corrugated pipe fitting includes an elastic corrugated pipe, a corrugated pipe nozzle and a corrugated pipe valve nozzle. The corrugated pipe nozzle is arranged on one side of the lower cover. The elastic corrugated pipe is fixedly connected to the corrugated pipe nozzle and is located on the top of the corrugated pipe nozzle. The corrugated pipe valve nozzle is fixedly connected to the elastic corrugated pipe and is located on the side of the elastic corrugated pipe away from the corrugated pipe nozzle.

5. The negative pressure automatic compensation pressure system according to claim 1, wherein ； The negative pressure tank / check valve tank includes a tank body, a cover plate, a suction nozzle, a sealing ring, a floating ball, a nozzle, a support plate and a negative pressure interface. The cover plate is fixedly connected to the tank body and is located on one side of the tank body. The support plate is fixedly connected to the cover plate and is located on the side of the cover plate away from the tank body. The nozzle is fixedly connected to the cover plate and penetrates through the cover plate and the support plate. The negative pressure interface is communicated with the cover plate and penetrates through the support plate. The sealing ring is fixedly connected to the cover plate and is located on the side of the cover plate close to the tank body. The suction nozzle is arranged on one side of the nozzle. The floating ball is communicated with the suction nozzle and is located inside the tank body.

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