Jet type medical negative pressure regulator

Abstract

The invention relates to the technical field of negative pressure suction medical treatment, and discloses a jet type medical negative pressure regulator which comprises a valve body, a jet pump, a jet regulator, a panel assembly, a driving air source switch and a vacuum meter. The valve body is provided with a plurality of cavities and connectors which are used for installing and communicating with other components. The jet pump and the jet regulator are installed in the corresponding cavities of the valve body, and the jet pump is connected with the jet regulator and used for generating and transmitting negative pressure. The jet regulator comprises a shell, a valve rod assembly and a telescopic pipe, and the jet flow of the ejector is adjusted by adjusting the position of a valve rod so as to control negative pressure output and automatically and stably output negative pressure. The panel assembly comprises a panel, an adjusting knob and an adjusting screw rod and is used for adjusting the negative pressure output value. The jet pump comprises a diffuser and an ejector, and the ejector is matched with the valve rod assembly to form a jet nozzle and a valve port for controlling the jet flow. The regulator has an integrated structure, is reasonable in design, can accurately regulate and stably output negative pressure, and meets the medical negative pressure requirement.

Description

Technical Field

[0001] The present invention relates to the technical field of negative pressure suction medical technology, and particularly to a jet-type medical negative pressure regulator. Background Art

[0002] In the field of medical negative pressure suction surgery, negative pressure, as the power source for surgical suction, plays a crucial role. Through negative pressure suction, waste liquid in the patient's body can be effectively removed, providing strong guarantee for the smooth progress of the surgery. Currently, there are mainly two forms of negative pressure sources for negative pressure suction: one is the pipeline negative pressure source provided by the medical central suction system; the other is the negative pressure source generated by using a compressed gas-driven jet vacuum pump in the absence of a pipeline negative pressure source.

[0003] In the existing technical system, when using a negative pressure source driven by compressed gas, it is usually necessary to first start the jet vacuum pump to generate negative pressure, and then connect the generated negative pressure to the negative pressure regulator for use. However, there are many deficiencies in this existing technology, and its deficiencies are mainly reflected in the following aspects:

[0004] Firstly, since the negative pressure generator and the negative pressure regulator are two independent devices, the overall cost is relatively high, and at the same time, it occupies a large installation space. During actual use, it is necessary to turn on the negative pressure generator and the negative pressure regulator successively, and the operation is relatively cumbersome. Especially after use, if only the negative pressure regulator is turned off and the negative pressure generator is forgotten to be turned off, it will also lead to waste of the gas source and increase the use cost.

[0005] Secondly, the existing jet pumps are usually of fixed structure and cannot be adjusted according to the negative pressure requirements in actual surgeries. Regardless of the negative pressure value actually required for the surgery, the jet vacuum pump will output a relatively fixed negative pressure, and then the output negative pressure is set by the negative pressure regulator. This design method results in a large amount of wasted driving gas source, especially when the negative pressure requirements change greatly during the surgery, the problem is particularly prominent.

[0006] In addition, the use of medical devices has extremely high requirements for safety and reliability. In order to ensure that medical devices can work properly under a wider range of gas supply pressures, the gas supply pressure range of medical gases is usually set between 0.28 MPa and 0.6 MPa. However, due to the fact that jet pumps are designed with rated operating conditions and rated driving working pressures, when the driving gas pressure changes greatly, the performance of the jet pump will be severely affected, and the gas consumption will also increase significantly. Especially when the upper limit (such as 0.6 MPa) and the lower limit (such as 0.28 MPa) of the gas supply pressure differ greatly, the problems of poor performance and wasted gas consumption of the jet pump are particularly significant.

[0007] In summary, the existing medical negative pressure suction systems have many deficiencies in the generation and regulation of the negative pressure source, as well as in terms of cost, efficiency, and operation convenience. Therefore, developing a new type of jet-type medical negative pressure regulator to solve the above problems has become an urgent need for the development of medical negative pressure suction technology. Summary of the Invention

[0008] One of the objectives of the present invention is to provide a jet-type medical negative pressure regulator, which realizes a negative pressure suction system with simple operation, high energy efficiency, and good stability by integrating a negative pressure generator and a negative pressure regulator.

[0009] To solve the above technical problems, a jet-type medical negative pressure regulator of the present invention includes: a valve body, a jet pump, a jet regulator, a panel assembly, as well as a driving air source switch and a vacuum gauge.

[0010] The valve body is provided with a plurality of chambers and interfaces for installing and connecting the jet pump, the jet regulator, the panel assembly, the driving air source switch, and the vacuum gauge.

[0011] The jet pump and the jet regulator are respectively installed in corresponding chambers of the valve body. The jet pump is connected to the jet regulator for generating and transmitting negative pressure.

[0012] The jet regulator includes a housing, a valve rod assembly disposed in the housing, and a telescopic tube disposed outside the housing; the valve rod assembly includes a valve rod and a diaphragm. A negative pressure feedback chamber is formed between the housing and the diaphragm, and the telescopic tube is internally connected to the negative pressure feedback chamber.

[0013] The jet regulator adjusts the jet flow rate of the jet pump ejector by adjusting the position of the valve rod to control the negative pressure output of the jet pump. The negative pressure output of the jet pump is connected to the negative pressure feedback interface of the valve body through the telescopic tube, and the output negative pressure is fed back to the negative pressure feedback chamber of the jet regulator. The diaphragm senses the magnitude of the output negative pressure and corrects the position of the valve rod to automatically stabilize the output negative pressure.

[0014] The panel assembly includes a panel and an adjustment knob, an adjustment screw rod cooperating with the jet regulator, and a small crossbar for restricting the rotation of the jet regulator. The small crossbar is used to constrain the jet regulator. The adjustment knob is connected to the jet regulator through the adjustment screw rod and drives the jet regulator to move axially for adjusting the negative pressure output value.

[0015] In addition to the above technical features, the present invention has also been improved in the following aspects:

[0016] In some embodiments, the jet regulator, the jet pump, the driving air source switch, and the vacuum gauge are integrated on the valve body and the panel assembly to form an integrated structure.

[0017] In some embodiments, the front of the valve body is provided with three chambers and one interface, namely an upper negative pressure gauge chamber, a middle switch chamber, and a lower regulator chamber; a negative pressure feedback interface is provided below the regulator chamber; an air guide hole is provided between the switch chamber and the regulator chamber, and the air guide hole is inclined and communicates the switch chamber with the regulator chamber.

[0018] In some embodiments, the back of the valve body is provided with one chamber and three interfaces. The chamber provided on the back of the valve body is a jet pump chamber, which is arranged at the lower part of the back of the valve body, and the jet pump chamber communicates with the regulator chamber on the front; a driving air source interface is provided on one side of the middle part of the back of the valve body; a suction interface is provided at the upper part of the back; a pressure relief interface is provided below the suction interface.

[0019] In some embodiments, a main channel is provided downward at the center of the upper end face of the valve body on the back side, and the main channel communicates the suction interface, the pressure relief interface, the negative pressure chamber of the jet pump chamber, and the negative pressure feedback interface; the upper opening of the main channel is blocked.

[0020] In some embodiments, the jet pump includes a diffuser and an ejector provided at one end of the diffuser.

[0021] In some embodiments, the left end of the diffuser is a smooth shaft, and the right end is a multi-stage columnar structure; a plurality of through holes are provided at the center of the diffuser, the left end of the through hole is an exhaust interface, and the right end forms a negative pressure generation chamber matching the ejector; a diffusion hole and a throat hole are further provided between the exhaust interface and the negative pressure generation chamber, and the diffusion hole and the throat hole communicate the exhaust interface and the negative pressure generation chamber; a plurality of radial through holes are provided in the circumferential direction of the negative pressure generation chamber.

[0022] In some embodiments, the ejector is in the shape of a nozzle, with an ax shoulder on the outer edge and a sealing ring provided on the ax shoulder; a nozzle is provided at the center of the ejector; a conical hole and an air inlet are provided behind the nozzle; a rib is provided at the junction of the nozzle and the conical hole; the nozzle communicates with the negative pressure generation chamber.

[0023] In some embodiments, the front end of the valve stem is provided with a conical head and a tip, the diameter of the tip is smaller than the nozzle aperture of the ejector, the tip can be inserted into the nozzle of the ejector to form a jet orifice, and the conical head of the valve stem and the rib inside the ejector form a valve orifice for controlling the jet flow rate.

[0024] In some embodiments, the cylindrical rear end of the valve stem and the counterbore at the left end of the adjusting screw of the panel assembly cooperate with each other to form a balance chamber; a channel hole is provided at the center of the rear end of the valve stem, the channel hole extends to the rear side of the conical head at the front end of the valve stem, and a radially through hole is provided at the rear side position of the conical head. The channel hole introduces the driving gas pressure at the front end into the balance chamber to balance the axial acting force of the driving air source pressure on the front end head of the valve stem.

[0025] In some embodiments, the valve stem assembly further includes an adjusting spring and a stabilizing spring. The adjusting spring is installed at the front end of the valve stem assembly, and the stabilizing spring is installed at the rear end of the valve stem assembly. The adjusting spring and the stabilizing spring cooperate with each other to stabilize the valve stem assembly at the equilibrium position.

[0026] In some embodiments, the panel assembly further includes a washer and a snap ring. The washer is installed between the adjusting screw and the panel, and the snap ring is installed at the rear end of the adjusting screw and is used to limit the axial movement of the adjusting knob.

[0027] In some embodiments, a discharge hole is provided at the joint where the housing of the jet regulator is combined with the regulator cavity. When the seal of the jet regulator fails, the discharge hole can eliminate the influence of the driving gas source in the regulator cavity on the negative pressure generating cavity.

[0028] By adopting the above technical solutions, the present invention has at least one of the following beneficial effects:

[0029] 1. Integrated and integrated design:

[0030] Compact structure: Key components such as the jet pump, jet regulator, driving gas source switch, and vacuum gauge are integrated on the valve body and panel assembly to form an integrated structure. This design not only simplifies the composition of the equipment but also significantly reduces the volume of the equipment, facilitating installation and use.

[0031] Convenient operation: The integrated design enables users to complete the adjustment and monitoring of negative pressure by operating only one piece of equipment, without the need to operate multiple independent components separately, greatly improving the convenience of use.

[0032] 2. Automatically stable output of negative pressure:

[0033] Negative pressure feedback mechanism: The negative pressure feedback cavity of the jet regulator is connected to the negative pressure feedback interface of the valve body through a telescopic tube to form a closed-loop control system. When the output negative pressure changes, the air pressure force in the negative pressure feedback cavity will change accordingly, correcting the position of the valve stem assembly and establishing a new balance, that is, the valve opening, so as to automatically adjust the jet flow rate and make the output negative pressure stable at the set value.

[0034] Improve surgical safety: Stable negative pressure output helps to improve the accuracy and safety of surgery and reduce surgical risks caused by negative pressure fluctuations.

[0035] 3. Energy-saving and efficient:

[0036] Gas supply on demand: The present invention can automatically adjust the jet flow rate of the jet pump according to the actual needs of clinical surgery, thereby controlling the negative pressure output. This gas supply on demand method effectively avoids waste of the gas source and improves the utilization rate of the driving gas source.

[0037] Wide range adaptability: The device can operate normally within the air supply pressure range of 0.28 - 0.6 MPa, and can maintain high working efficiency and stability at different pressures. This is due to the precise control of the jet regulator over the jet flow rate, enabling the device to meet the requirements of different surgical scenarios.

[0038] 4. Improve the stability and reliability of the device:

[0039] Structural optimization design: Through reasonable structural design and component layout, the overall stability and reliability of the device are improved. For example, the valve body adopts a multi-chamber design, which not only facilitates the installation and connection of components but also enhances the structural strength of the device.

[0040] Safety protection mechanism: Multiple safety protection mechanisms are provided inside the device, such as drain holes, etc., which can eliminate potential safety hazards in a timely manner when the seal of the jet regulator fails, ensuring the safe and reliable operation of the device.

[0041] 5. Reduce costs and improve economic benefits:

[0042] Reduce manufacturing costs: The integrated design and integrated production help reduce the manufacturing costs of the device and improve production efficiency.

[0043] Improve the utilization rate of the device: Due to the energy-saving, efficient, and convenient operation characteristics of the device, it can be widely used in various surgical scenarios, improving the utilization rate and economic benefits of the device.

[0044] In summary, the jet-type medical negative pressure regulator of the present invention has the advantages of a compact structure, simple operation, automatic and stable negative pressure output, energy-saving and high efficiency, etc. Its integrated design makes the device more convenient for installation and use, and the function of automatically and stably outputting negative pressure improves the accuracy and safety of surgery. At the same time, the energy-saving and high-efficiency characteristics help reduce the operating costs of medical institutions and improve the use efficiency of the device. Brief description of the drawings

[0045] The drawings described herein are used to provide a further understanding of the present invention, form a part of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, and do not constitute an improper limitation to the present invention.

[0046] Figure 1 is a structural schematic diagram of the prior art;

[0047] Figure 2 is a structural schematic diagram of the jet-type medical negative pressure regulator of the present invention;

[0048] Among them: 2a is the front view of the present invention, 2b is the sectional view, 2c is the rear axonometric view, and 2d is the exploded view;

[0049] Figure 3 This is a schematic structural diagram of the valve body in the jet-type medical negative pressure regulator of the present invention;

[0050] Among them: 3a is a longitudinal sectional view of the valve body, 3b is a front axonometric view of the valve body, and 3c is a rear view of the valve body;

[0051] Figure 4 This is a schematic structural diagram of the jet pump in the jet-type medical negative pressure regulator of the present invention;

[0052] Among them: 4a is a longitudinal sectional view of the jet pump, and 4b is an exploded view of the jet pump;

[0053] Figure 5 This is a schematic structural diagram of the jet regulator in the jet-type medical negative pressure regulator of the present invention;

[0054] Among them: 5a is a front view of the jet regulator, 5b is a longitudinal sectional view of the jet regulator, and 5c is an exploded view of the jet regulator;

[0055] Figure 6 This is a schematic structural diagram of the panel assembly in the jet-type medical negative pressure regulator of the present invention;

[0056] Among them: 6a is a longitudinal sectional view of the panel assembly, and 6b is an exploded view of the panel assembly;

[0057] Figure 7 This is a schematic structural diagram after the jet-type medical negative pressure regulator of the present invention is combined and connected with the suction device;

[0058] Figure 8 This is the working principle diagram of the jet-type medical negative pressure regulator of the present invention;

[0059] Figure 9 is Figure 8 a partial enlarged view of.

[0060] The reference numerals in the figure are as follows:

[0061] 100, valve body; 200, jet pump; 300, jet regulator; 400, panel assembly; 500, driving air source switch; 600, vacuum gauge; 710, screw; 720, support sleeve;

[0062] 110, negative pressure gauge cavity; 120, switch cavity; 121, inclined air guide hole; 130, regulator cavity; 140, negative pressure feedback interface; 150, jet pump cavity; 151, negative pressure cavity; 161, driving air source interface; 162, suction interface; 163, pressure relief interface; 170, main channel;

[0063] 210. Diffuser; 211. Negative pressure generating cavity; 212. Exhaust interface; 213. Radial through hole; 214. Throat hole; 215. Diffusion hole; 220. Injector; 221. Nozzle; 222. Edge; 223. Jet orifice; 224. Valve port;

[0064] 310. Housing; 311. First sealing ring; 312. Second sealing ring; 313. Discharge hole; 314. Gas guide pipe orifice; 320. Valve rod assembly; 321. Valve rod; 322. Diaphragm; 323. Taper head; 324. Channel hole; 325. Third sealing ring; 326. Tip; 330. Upper cover; 331. Threaded hole; 332. Vent hole; 333. Ear platform; 340. Flexible pipe; 350. Adjusting spring; 360. Stabilizing spring; 370. Negative pressure feedback cavity;

[0065] 410. Panel; 411. Flange; 412. Vacuum gauge hole; 413. Switch hole; 414. Adjusting hole; 415. Small cross bar; 420. Adjusting knob; 430. Adjusting screw; 431. Thread; 432. Balance cavity. Detailed implementation manners

[0066] Now, various exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and in no way limits the present invention and its application or use. The present invention can be implemented in other different forms and is not limited to the embodiments described herein.

[0067] The embodiments given in combination with the technical solutions of the present invention are to make the present invention more thorough and complete, and fully express the scope of the present invention to those skilled in the art. It should be noted that: unless specifically stated otherwise in the present invention, the relative arrangements of the components described in these embodiments should be construed as merely exemplary and not as a limitation to the technical solutions of the present invention.

[0068] In the present invention, if directional terms such as "upper", "lower", "left", "right", "bottom", "top", etc. are involved, they are defined relative to the directions in each drawing and are only used to represent the relative position relationship. When the absolute position of the object to be described changes, the relative position relationship may also change accordingly. These or other directional terms should not be construed as restrictive terms.

[0069] In the present invention, the similar terms such as "one", "a", "an", "the", etc. do not represent a quantity limitation and may represent singular or plural. The terms "include", "comprise", "have" and any variations thereof involved in the present invention are intended to cover non-exclusive inclusion; the terms "first", "second", "third", etc. involved in the present invention are only used to distinguish similar objects and do not represent a specific order for the objects.

[0070] In the present invention, when it is described that a specific device is located between a first device and a second device, there may or may not be an intermediate device between the specific device and the first device or the second device. When it is described that a specific device is connected to other devices, the specific device may be directly connected to the other devices without an intermediate device, or may not be directly connected to the other devices but have an intermediate device.

[0071] In addition, the present invention does not discuss in detail the technologies and devices known to those of ordinary skill in the relevant art, but in appropriate cases, the said technologies and devices should be regarded as part of the specification.

[0072] The prior art has obvious deficiencies in the field of medical negative pressure suction surgery. First, the negative pressure generator and the negative pressure regulator, as independent devices, not only increase the overall cost, but also occupy a large installation space, and the operation is cumbersome, and it is easy to cause waste of gas source due to misoperation. Second, most jet pumps are of fixed structure and cannot be adjusted in real time according to the negative pressure requirements during the operation, resulting in serious waste of the driving gas source, especially in surgeries with large changes in negative pressure requirements. In addition, the supply pressure range of medical gases is wide, and the performance of jet pumps is poor when the supply pressure fluctuates, and the gas consumption increases significantly. Especially when the upper and lower limits of the supply pressure differ greatly, the problem is particularly serious. These problems not only affect the efficiency and cost of the medical negative pressure suction system, but also pose challenges to the safety and reliability of the surgery. Therefore, it is urgent to develop a new type of jet-type medical negative pressure regulator to solve the above problems.

[0073] Based on the above problems, the present invention specifically provides technical solutions to solve the above problems. The technical solutions, working principles and technical effects of the present invention will be described in detail below with specific embodiments.

[0074] In order to more clearly illustrate the principle of the technical solutions in the present invention, the following is an explanation:

[0075] The existing jet-type negative pressure regulator separates the negative pressure generator from the negative pressure regulator. The negative pressure generator is of a fixed structure. No matter how much negative pressure is actually required for negative pressure suction, it works under the maximum gas consumption condition to meet the maximum negative pressure requirement. And the pressure range of the driving gas source is wide (0.28 - 0.6 MPa). To ensure that the negative pressure can meet the requirements under low driving pressure, the waste of the gas source is more serious and the efficiency is low when the driving pressure is high. When in use, both sets of equipment need to be operated, which is inconvenient and occupies a large space.

[0076] Integrate the negative pressure generator and the negative pressure regulator into one. The adjustment mechanism of the negative pressure regulator directly controls the nozzle of the jet vacuum pump, controls the working state of the jet vacuum pump, and feeds back the output negative pressure value of the negative pressure regulator to the adjustment mechanism of the negative pressure regulator, automatically adjusting the size of the nozzle of the jet pump injector to correct the actual output negative pressure value of the negative pressure generator, so that the actual output negative pressure value of the jet vacuum pump is stabilized within the set value range of the negative pressure regulator.

[0077] According to the principle of fluid mechanics, when pressure is converted into velocity, the square of velocity V is directly proportional to the magnitude of pressure P.

[0078] V 2 ∝P; Q 2 ∝P

[0079] According to the principle of conservation of momentum, momentum exchange occurs when the jet vacuum pump is working:

[0080] If: the injection velocity is V 1 , the mass is m 1 , the suction velocity V 2 , the mass m 2 ;

[0081] Total before momentum exchange: V 1 m 1 +V 2 m 2

[0082] The velocity of the discharged together after momentum exchange is V 3 , total after momentum exchange: V 3 (m 1 +m 2 );

[0083] Then the momentum equation:

[0084] V 1 m 1 +V 2 m 2 =V 3 (m 1 +m 2 )

[0085] According to the principle of fluid mechanics, it can be seen from the momentum equation that, with momentum unchanged, the greater the velocity, the smaller the required mass m (flow rate Q). If the driving gas source pressure is high, the injection velocity is high, and the consumption of the driving gas source can be reduced; vice versa. Within a certain range of driving gas source pressures, the present invention can adjust the gas consumption of the driving gas source according to the magnitude of the driving gas source pressure while ensuring that the output negative pressure requirement is met, effectively utilizing the gas source, saving the driving gas source, and the operation is not affected by the magnitude of the driving gas source pressure.

[0086] In addition, after integrating the negative pressure generator and the negative pressure regulator, the operation is simple, the use is convenient, the occupied space is small, and it is convenient to be embedded into medical anesthesia devices.

[0087] I. Component Composition and Functions

[0088] As Figures 2 - 6 shown, the present invention discloses a jet-type medical negative pressure regulator, which includes a valve body 100, a jet pump 200, a jet regulator 300, a panel assembly 400, as well as a driving air source switch 500 and a vacuum gauge 600.

[0089] The valve body 100 is provided with a plurality of chambers and interfaces for installing and connecting the jet pump 200, the jet regulator 300, the panel assembly 400, the driving air source switch 500 and the vacuum gauge 600.

[0090] On the front surface of the valve body 100, there are three chambers and one interface, namely, an upper, a middle and a lower chamber. The upper part is a negative pressure gauge chamber 110 for installing and fixing the vacuum gauge 600. The middle part is a switch chamber 120 for placing the driving air source switch 500. The lower part is a regulator chamber 130 for installing the jet regulator 300. A negative pressure feedback interface 140 is provided below the regulator chamber 130.

[0091] An air guide hole 121 is provided between the switch chamber 120 and the regulator chamber 130. The air guide hole 121 is inclined and communicates the switch chamber 120 with the regulator chamber 130.

[0092] On the back surface of the valve body 100, there is one chamber and three interfaces. This chamber is a jet pump chamber 150, which is arranged at the lower part of the back surface of the valve body. The jet pump chamber 150 communicates with the regulator chamber 130 on the front surface.

[0093] On one side of the middle part of the back surface of the valve body 100, a driving air source interface 161 is provided. On the upper part of the back surface, a suction interface 162, that is, a negative pressure output port, is provided. A pressure relief interface 163 is provided below the suction interface 162.

[0094] At the center of the upper end surface of the valve body 100, close to the back side, a downward main channel 170 is provided. The main channel 170 connects the suction interface 162, the pressure relief interface 163, the negative pressure chamber 151 of the jet pump chamber 150 and the negative pressure feedback interface 140. The upper opening of the main channel 170 is blocked.

[0095] The jet pump 200 and the jet regulator 300 are respectively installed in the corresponding chambers of the valve body 100. The jet pump 200 is connected to the jet regulator 300 for generating and transmitting negative pressure.

[0096] The jet pump 200 includes a diffuser 210 and an ejector 220 provided at one end of the diffuser 210.

[0097] The left end of the diffuser 210 is an optical axis, and the right end is a multi-stage columnar structure. A plurality of through holes are provided in the center of the diffuser 210. The left end of the through hole is an exhaust interface 212, and the right end forms a negative pressure generating cavity 211 that matches the injector 220.

[0098] Diffusion holes 215 and throat holes 214 are also provided between the exhaust interface 212 and the negative pressure generating cavity 211. The diffusion holes 215 and the throat holes 214 communicate the exhaust interface 212 and the negative pressure generating cavity 211. A plurality of radial through holes 213 are provided in the circumferential direction of the negative pressure generating cavity 211.

[0099] The injector 220 is in the shape of a nozzle, with a shoulder on the outer edge and a sealing ring provided on the shoulder. A nozzle 221 is provided in the center of the injector 220. A tapered hole and an air inlet are provided behind the nozzle 221. An edge 222 is provided at the junction of the nozzle 221 and the tapered hole. The nozzle 221 communicates with the negative pressure generating cavity 211.

[0100] The jet regulator 300 includes a housing 310, a valve stem assembly 320 disposed in the housing 310, and a telescopic tube 340 disposed outside the housing.

[0101] The valve stem assembly 320 includes a valve stem 321 and a diaphragm 322. A negative pressure feedback cavity 370 is formed between the housing 310 and the diaphragm 322. The telescopic tube 340 is connected to the inside of the negative pressure feedback cavity 370.

[0102] The front end of the valve stem 321 is provided with a tapered head 323 and a tip 326. The diameter of the tip 326 is smaller than the aperture of the nozzle 221 of the injector 220. The tip 326 can be inserted into the nozzle 221 of the injector 220 to form a jet orifice 223. And the tapered head 323 of the valve stem 321 and the edge 222 inside the injector 220 form a valve orifice 224 for controlling the injection flow rate.

[0103] During operation, the injection flow rate of the injector 220 is adjusted by adjusting the position of the valve stem 321 to control the negative pressure output.

[0104] The negative pressure feedback cavity 370 of the jet regulator 300 is communicated with the negative pressure feedback interface 140 of the valve body 100 through the telescopic tube 340 to automatically stabilize the output negative pressure.

[0105] The panel assembly 400 includes a panel 410, an adjustment knob 420, and an adjustment screw 430 that cooperates with the jet regulator 300.

[0106] The adjustment knob 420 is connected to the jet regulator 300 through the adjustment screw 430 and is used to adjust the negative pressure output value.

[0107] The panel 410 is rectangular, with a convex edge 411 provided near the edge of the back surface, and openings are provided at the positions corresponding to the cavities of the valve body 1 on the front surface.

[0108] The upper part of the panel 410 is a vacuum gauge hole 412 for installing a vacuum gauge 600; the middle part is a switch hole 413 for installing a driving air source switch 500; the lower part is an adjustment hole 414 for installing an adjustment screw 430 and a jet regulator 300.

[0109] The adjustment hole 414 is set in a boss shape, which can reduce the overall height dimension. Threaded holes are provided at the corresponding positions of the convex edge 411 and the mounting hole of the valve body 1. Symmetric small cross-blocks 415 are provided below the convex edge 411, corresponding to the ear platforms 333 on the outer periphery of the upper cover 330 of the jet regulator 300, restricting the jet regulator and limiting the rotation of the jet regulator 300, and it can only move axially.

[0110] The inner end of the adjustment screw 430 is a thread 431, and a balance cavity 432 is formed by the counterbore at the thread center. The cylindrical rear end of the valve stem 321 cooperates with the balance cavity 432.

[0111] A channel hole 324 is provided at the center of the rear end of the valve stem 321, and the channel hole 324 extends to the rear side of the tapered head 323 at the front end of the valve stem, and a radially through hole is provided at the rear side position of the tapered head. The channel hole 324 introduces the driving gas pressure at the front end into the balance cavity 432 to balance the axial acting force of the driving air source pressure on the front head of the valve stem 321.

[0112] The jet regulator 300 also includes components such as an upper cover 330, an adjustment spring 350, a stabilizing spring 360, a sealing ring, and screws.

[0113] The upper cover 330 is a cap-shaped cover with a boss, the center is a threaded hole 331, and ear platforms 333 and screw holes corresponding to the housing 310 are provided on the periphery. Inner and outer ventilation holes 332 are provided in the middle annular part. The adjustment spring 350 is installed at the front end of the valve stem assembly 320, and the stabilizing spring 360 is installed at the rear end of the valve stem assembly 320. The adjustment spring 350 and the stabilizing spring 360 cooperate with each other to stabilize the valve stem assembly 320 in the balanced position.

[0114] When the jet-type medical negative pressure regulator of the present invention works, the driving air source enters the switch cavity 120 through the driving air source interface 161, and then enters the regulator cavity 130 through the air guide hole 121 to provide power for the jet pump 200 and the jet regulator 300. The negative pressure is output through the suction interface 162. The position of the valve stem 321 of the jet regulator 300 can be adjusted by the adjustment knob 420, so as to change the jet flow rate of the ejector 220 and achieve the purpose of adjusting the negative pressure. At the same time, the negative pressure feedback cavity 370 is communicated with the negative pressure feedback interface 140 through the telescopic tube 340, and the output negative pressure can be automatically stabilized.

[0115] II. Assembly process:

[0116] Insert the injector (220) with a sealing ring into the negative pressure generating chamber (211) of the diffuser (210) with a sealing ring. Position the shoulder of the injector (220) to form the jet pump (200).

[0117] Install a sliding ring and a third sealing ring (325) at the rear end of the valve stem (321). Slip the diaphragm (322) over the disc at the rear end of the valve stem (321), install a gasket, and screw on a nut to form the valve stem assembly (320).

[0118] Slip the adjusting spring (350) over the front part of the valve stem assembly (320) and insert it into the housing (310) with a sealing ring installed. Slip the stabilizing spring (360) over the rear end, cover the upper cover (330), press down on the thick edge of the diaphragm (322) for a good seal, screw on the screws, and then install the telescopic tube (340) to form the jet regulator (300).

[0119] Install the jet regulator into the panel assembly (400). Align the threaded hole (331) at the rear of the jet regulator (300) with the thread (431) of the adjusting screw (430) on the back of the panel assembly (400), and align the ear platform (333) with the small cross bar (415) to restrain the jet regulator (300) from rotating.

[0120] Turn the adjusting knob (420) to slip the jet regulator (300) onto the thread (431) of the adjusting screw (430). The balance chamber (432) of the adjusting screw (430) slips over the rear end of the valve stem (321) at the center of the jet regulator (300), and the sealing ring (325) seals the balance chamber (432).

[0121] Align the panel assembly (400) with the jet regulator (300) with the assembled valve body (1). Insert the front part of the jet regulator (300) into the regulator chamber (130) at the lower part of the valve body (1), and the first sealing ring (311) seals the regulator chamber (130).

[0122] Insert the telescopic tube (340) into the negative pressure feedback interface (140) of the valve body (1). Slip the switch hole (413) of the panel (410) over the drive air source switch (500) and fix it, then screw on the screws (710) to fix the valve body (1) and the panel assembly (400).

[0123] Insert the drive air source switch (500) into the switch chamber (120) in the middle of the valve body (1). Screw the jet pump (200) into the jet pump chamber (150) of the valve body (1). Pass the screws (710) through the screw holes of the valve body (1), and then slip on the support sleeve (720).

[0124] Finally, insert the vacuum gauge (600) through the vacuum gauge hole (412) at the upper part of the panel (410) into the negative pressure gauge cavity (110) at the upper part of the valve body (1). Install a pressure relief valve on the pressure relief interface (163) of the valve body (1) to form the present invention.

[0125] III. Working Principle:

[0126] As Figures 7 - 9 shown, before work, connect the driving gas source to the driving gas source interface (161), connect the suction instrument to the suction interface (162), and connect the exhaust pipe to the exhaust interface (212).

[0127] During work, the driving gas source enters the driving gas source switch (500). Turn the driving gas source switch (500) upward to turn on the driving gas source. The driving gas source passes through the driving gas source switch (500), is introduced into the regulator cavity (130) through the air guide hole (121), enters the channel between the head of the valve stem (321) and the nozzle (221), and after being controlled by the valve port (224), is ejected at high speed from the nozzle (223), enters the throat hole (214) of the diffuser (210), diffuses in the diffusion hole (215) and then is discharged from the exhaust interface (212), generating negative pressure in the negative pressure generating cavity (211) of the diffuser (210).

[0128] The generated negative pressure is connected to the negative pressure cavity (151) through the radial through hole (213), and then communicated from the negative pressure cavity (151) to the main channel (170), and is transmitted by the main channel (170) to the negative pressure gauge cavity (110), the suction interface (162), and the pressure relief interface (163) for work. The vacuum gauge (600) monitors the magnitude of the negative pressure, the suction interface (162) provides negative pressure to the suction instrument, and the pressure relief interface (163) discharges the positive pressure that may be generated during a fault.

[0129] At the same time, the main channel (170) feeds back the generated negative pressure to the negative pressure feedback cavity (370) of the jet regulator (300) through the telescopic tube (340), acts on the inner side of the diaphragm (322), generates a pressure difference with the outside atmosphere, and together with the regulating spring (350) and the stabilizing spring (360), makes the valve stem assembly (320) in a balanced position.

[0130] When adjusting the output negative pressure, the adjusting knob (420) can be rotated to drive the adjusting screw (430) to rotate, drive the jet regulator (300) and the valve stem as a whole to move back and forth, adjust the opening degree of the valve port (224), and adjust the jet flow rate (speed) of the jet pump. At the same time, the negative pressure generated in the negative pressure generating cavity (211) is fed back to the negative pressure feedback cavity (370) of the jet regulator (300) through the telescopic tube (340), so that the valve stem assembly (320) is in a new balanced position, thereby controlling the magnitude of the adjusted output negative pressure.

[0131] When the working conditions change, such as the change in the driving air source pressure or the change in the flow rate of negative pressure suction, the output negative pressure will change. The changed output negative pressure is fed back to the negative pressure feedback chamber (370), and the air pressure acting on the diaphragm (322) will change, resulting in a change in the force balance on the valve stem assembly (320). The position of the valve stem assembly (320) will change and be adjusted to a new equilibrium position, thereby changing the opening degree of the valve port (224).

[0132] When it stops being used, directly turn down the driving air source switch (500) to close the driving air source.

[0133] Through the above specific implementation manners, the present invention can achieve automatically adjusting the working state of the negative pressure generator according to the actual output negative pressure after setting the output negative pressure, meeting the requirements of the set output negative pressure, saving the driving air source at the same time, and improving the safety and economy of use.

[0134] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0135] In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement; when the combination of technical solutions conflicts with each other or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

Claims

1. A jet-type medical negative pressure regulator, characterized in that: The invention comprises a valve body (100), a jet pump (200), a jet regulator (300), a panel assembly (400), a driving air source switch (500) and a vacuum gauge (600); the jet regulator (300), the jet pump (200), the driving air source switch (500) and the vacuum gauge (600) are integrated on the valve body (100) and the panel assembly (400) to form an integrated structure; The valve body (100) is provided with a plurality of chambers and interfaces for installing and connecting the jet pump (200), the jet regulator (300), the panel assembly (400), the driving gas source switch (500) and the vacuum gauge (600); The jet pump (200) and the jet regulator (300) are respectively installed in corresponding chambers of the valve body (100), and the jet pump (200) is connected to the jet regulator (300) to generate and transmit negative pressure; The jet regulator (300) adjusts the jet flow rate of the injector (220) by adjusting the valve stem (321) to control the negative pressure output; and the negative pressure feedback chamber (370) of the jet regulator (300) is connected to the negative pressure feedback interface (140) of the valve body (100) through the telescopic tube (340), and the output negative pressure is fed back to the negative pressure feedback chamber (370), and the position of the valve stem (321) is corrected through the valve stem assembly (320) to automatically stabilize the output negative pressure; The panel assembly (400) comprises a panel (410) and an adjusting knob (420), and an adjusting screw (430) matched with the jet regulator (300); the adjusting knob (420) is connected to the jet regulator (300) via the adjusting screw (430) and is used to adjust the negative pressure output value.

2. The jet-type medical negative pressure regulator according to claim 1, characterized in that: The front of the valve body (100) is provided with three chambers, namely, upper, middle and lower chambers, and an interface, wherein the upper chamber is a negative pressure gauge chamber (110), the middle chamber is a switch chamber (120), and the lower chamber is a regulator chamber (130); A negative pressure feedback interface (140) is provided below the regulator cavity (130); an air guide hole (121) is provided between the switch cavity (120) and the regulator cavity (130); the air guide hole (121) is arranged at an angle and connects the switch cavity (120) and the regulator cavity (130).

3. The jet-type medical negative pressure regulator according to claim 1 or 2, characterized in that: The back of the valve body (100) is provided with a chamber and three interfaces, the chamber provided on the back of the valve body is a jet pump chamber (150) provided at the lower part of the back of the valve body, and the jet pump chamber (150) is connected with the regulator chamber (130) on the front; A driving air source interface (161) is provided on one side of the middle of the back side of the valve body; a suction interface (162) is provided on the upper part of the back side; and a pressure relief interface (163) is provided below the suction interface (162).

4. The jet-type medical negative pressure regulator according to claim 3, characterized in that: A downward main channel (170) is provided at the back side of the center of the upper end face of the valve body (100); the main channel (170) connects the suction interface (162), the pressure relief interface (163), the negative pressure chamber (151) of the jet pump chamber (150), and the negative pressure feedback interface (140); and the upper opening of the main channel (170) is blocked.

5. The jet-type medical negative pressure regulator according to claim 1, characterized in that: The jet pump (200) comprises a diffuser (210) and an ejector (220) arranged at one end of the diffuser (210); The left end of the diffuser (210) is an optical axis, and the right end is a multi-stage columnar structure; The center of the diffuser (210) is provided with a plurality of through holes, the left end of the plurality of through holes is an exhaust port (212), and the right end forms a negative pressure generating chamber (211) matching the ejector (220); A diffusion hole (215) and a throat hole (214) are also provided between the exhaust interface (212) and the negative pressure generating cavity (211); the diffusion hole (215) and the throat hole (214) are connected to the exhaust interface (212) and the negative pressure generating cavity (211); and a plurality of radial through holes (213) are provided in the circumference of the negative pressure generating cavity (211). The injector (220) is in the shape of a nozzle, and is provided with a shaft shoulder on the outer edge, and a sealing ring is provided on the shaft shoulder; a nozzle (221) is provided at the center of the injector (220); a conical hole and an air inlet are provided behind the nozzle (221); an edge (222) is provided at the intersection of the nozzle (221) and the conical hole; and the nozzle (221) is connected to the negative pressure generating chamber (211).

6. The jet-type medical negative pressure regulator according to claim 1, characterized in that: The jet regulator (300) is a diaphragm regulator, and comprises a housing (310), a valve stem assembly (320) disposed in the housing (310), and a telescopic tube (340), an adjusting spring (350), and a stabilizing spring (360) disposed outside the housing; the valve stem assembly (320) comprises a valve stem (321) and a diaphragm (322); a negative pressure feedback chamber (370) is formed between the housing (310) and the diaphragm (322), and the telescopic tube (340) is communicated with the inside of the negative pressure feedback chamber (370); The front end of the valve stem (321) is provided with a cone head (323) and a tip (326); the diameter of the tip (326) is smaller than the aperture of the nozzle (221) of the injector (220); the tip (326) can be inserted into the nozzle (221) of the injector (220) to form a jet nozzle (223); and the cone head (323) of the valve stem (321) and the edge (222) in the injector (220) form a valve port (224) for controlling the injection flow rate; The cylindrical rear end of the valve stem (321) cooperates with the left end counterbore of the adjusting screw (430) of the panel assembly (400) to form a balancing chamber (432); A channel hole (324) is provided at the center of the rear end of the valve stem (321), and the channel hole (324) extends to the rear side of the cone head (323) at the front end of the valve stem, and a radial through hole is provided at the rear side of the cone head. The channel hole (324) introduces the driving gas pressure at the front end into the balance chamber (432) to balance the axial force of the driving gas source pressure on the front end head of the valve stem (321).

7. The jet-type medical negative pressure regulator according to claim 6, characterized in that: The valve stem assembly (320) also includes an adjusting spring (350) and a stabilizing spring (360), wherein the adjusting spring (350) is installed at the front end of the valve stem assembly (320), and the stabilizing spring (360) is installed at the rear end of the valve stem assembly (320), and the adjusting spring (350) and the stabilizing spring (360) cooperate with each other to stabilize the valve stem assembly (320) in a balanced position.

8. The jet-type medical negative pressure regulator according to claim 1, characterized in that: The panel assembly (400) further comprises an adjusting screw (430), a washer and a retaining spring, wherein the adjusting screw (430) is inserted into the adjusting hole (414) on the panel (410), the washer is installed between the adjusting screw (430) and the panel (410), and the retaining spring is installed at the rear end of the adjusting screw (430) to constrain the adjusting screw in the adjusting hole (414) on the panel (410); The panel (410) further includes a small cross block (415), and an ear platform (333) is provided on the outer periphery of the upper cover (330) of the jet regulator 300. The small cross block (415) blocks the ear platform (333) and is used to constrain the jet regulator (300), so that the jet regulator (300) can only move in the axial direction.

9. The jet-type medical negative pressure regulator according to claim 6 or 8, characterized in that: A discharge hole (313) is provided at the portion where the shell (310) of the jet regulator (300) is combined with the regulator chamber (130). When the seal of the jet regulator (300) fails, the discharge hole (313) can eliminate the influence of the driving air source in the regulator chamber (130) on the negative pressure generating chamber (211).

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