CN115898972A - Gas-saving medical negative pressure generator - Google Patents
Gas-saving medical negative pressure generator Download PDFInfo
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- CN115898972A CN115898972A CN202211304869.6A CN202211304869A CN115898972A CN 115898972 A CN115898972 A CN 115898972A CN 202211304869 A CN202211304869 A CN 202211304869A CN 115898972 A CN115898972 A CN 115898972A
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Abstract
The invention discloses a gas-saving type medical negative pressure generator, which comprises a negative pressure generator valve body, a piston assembly and a jet pump, wherein a throttling device for automatically limiting driving flow according to the change of driving air pressure is arranged in the piston assembly; when the driving air pressure is too high, the air pressure overcomes the force of the elastic part, and the small piston is pushed to drive the slide valve to reduce the opening degree of an air port communicated with the jet pump; when the air pressure is in a normal range, the elastic component drives the small piston to reset, and the opening degree of an air port communicated with the jet pump is recovered. The gas-saving medical negative pressure generator can ensure that the negative pressure generator meets the performance requirement when being driven by low air pressure; when the negative pressure generator is driven by high air pressure, the driving flow can be automatically limited on the premise of meeting the performance of the negative pressure generator, and the consumption and waste of driving gas are reduced.
Description
Technical Field
The invention relates to a negative pressure suction technology, in particular to a medical negative pressure generator.
Background
In the field of medical negative pressure suction surgery, negative pressure is required as a power for surgical suction, and waste liquid during surgery needs to be removed by negative pressure suction. Generally, the negative pressure suction has two types, one is a pipeline negative pressure source provided by a medical central suction system, and the other is a negative pressure source which is driven by compressed gas and generated by a negative pressure generator when the pipeline negative pressure source is not provided. The negative pressure source is connected with a negative pressure suction apparatus (device), and the negative pressure suction apparatus implements the negative pressure suction operation.
The compressed gas for driving the negative pressure generator is a compressed gas for breathing which is used in an anesthesia machine or a respirator. In order to improve the application range of the anesthesia machine and the respirator, the allowable pressure change range of the used compressed gas is very large and is between 0.28 and 0.6 MPa. As shown in fig. 1, the size of the driving gas flow channel of the conventional medical negative pressure generator is fixed, and the size of the nozzle of the negative pressure generator is also fixed, so that according to the gas dynamics principle, the driving gas pressure is high, the side gas consumption is high, the driving gas pressure is low, and the side gas consumption is low.
In order to ensure that the negative pressure output performance of the negative pressure generator meets the requirement of negative pressure suction, the negative pressure generator is usually designed according to low driving air pressure. Based on the design, when the air pressure is high, the flow of the driving gas is large, the consumed driving gas is large, and more than one time of gas is consumed according to the air pressure range of 0.28-0.6 MPa according to the gas dynamics principle, so that the driving gas is wasted greatly. If the gas consumption of the negative pressure generator is economic when high driving pressure is required to be ensured, the driving pressure is too low when low pressure driving is carried out, the driving flow is insufficient, the negative pressure generated by the negative pressure generator is insufficient, and the requirement of negative pressure suction cannot be met.
Disclosure of Invention
Aiming at the problems of the negative pressure generator, the invention aims to provide a gas-saving medical negative pressure generator which can ensure that the negative pressure generator meets the performance requirement when being driven by low air pressure; when the negative pressure generator is driven by high air pressure, the driving flow can be automatically limited on the premise of meeting the performance of the negative pressure generator, and the consumption and waste of driving gas are reduced.
In order to achieve the aim, the throttle type medical negative pressure generator provided by the invention comprises a negative pressure generator valve body, a piston assembly and a jet pump, wherein the differential piston assembly and the jet pump are respectively arranged in the negative pressure generator valve body; when the driving air pressure is too high, the air pressure overcomes the force of the elastic part, and the small piston is pushed to drive the slide valve to reduce the opening degree of an air port communicated with the jet pump; when the air pressure is in a normal range, the elastic component drives the small piston to reset, and the opening degree of an air port communicated with the jet pump is recovered.
Further, the piston assembly is a differential piston assembly.
Further, the differential piston assembly includes a spool valve including a piston constituting a large end portion and a piston rod constituting a small end portion, the spool valve having a central hole formed therein; an air inlet communicated with the central hole is formed in the position corresponding to the piston rod; the end part of the piston rod is provided with a large counter bore for arranging the throttling device, and the piston rod is provided with an air outlet hole communicated to the outside corresponding to the large bore section of the large counter bore.
Furthermore, a switch-shaped cavity which is communicated along a first direction is arranged in the valve body, one end of the switch-shaped cavity is a piston cavity matched with the large end part of the slide valve, and the other end of the switch-shaped cavity is a slide valve cavity matched with the small end part of the slide valve; an air inlet cavity and an air outlet cavity are arranged in the sliding valve cavity, and an air inlet is arranged on the side surface of the air inlet cavity; and a jet pump cavity is arranged in the valve body along the second direction.
Furthermore, the small piston is cylindrical, one end of the small piston is a piston part, the end part of the small piston protrudes out of the circular truncated cone, the other end of the small piston is a small spool of the sliding valve, a counter bore is arranged in the center of the small piston, a ventilation groove is formed between the piston part and the small spool, and a ventilation hole is formed in the ventilation groove and communicated with the counter bore in the piston rod.
Further, the elastic component is a spring.
The throttle-type medical negative pressure generator provided by the invention has the advantages that the throttle device is introduced and is innovatively arranged in the differential piston assembly of the negative pressure generator, so that the automatic limitation of the driving flow according to the change of the driving air pressure is effectively realized, the opening degree of an air port communicated with a jet pump can be reduced when the driving air pressure is too high, and the flow is reduced; the air pressure control device can reset when the air pressure is in a normal range, the opening degree of an air port communicated with the jet pump is recovered, and the problem of overlarge flow when the air pressure is driven to be high can be effectively solved.
When the air-saving medical negative pressure generator provided by the invention is specifically applied, the driving flow rate at low driving air pressure can be properly increased, and the performance of the negative pressure generator at low driving air pressure is improved, so that the performance of the medical negative pressure generator is improved, and the application range is enlarged.
The gas-saving medical negative pressure generator provided by the invention can be directly realized based on the medical negative pressure generator in practical application, does not influence the overall appearance and installation size of the conventional medical negative pressure generator, and has low cost and strong practicability.
Drawings
The invention is further described below in conjunction with the appended drawings and the detailed description.
FIG. 1 is a structural diagram of a conventional linkage medical negative pressure generator;
FIG. 2 is a diagram of an exemplary configuration of an air-saving medical negative pressure generator according to an embodiment of the present invention;
FIG. 3 is a view showing an example of the structure of a cross section of a valve body according to an embodiment of the present invention;
FIG. 4 is an assembly view of an example slide valve assembly in accordance with an embodiment of the present invention;
FIG. 5 is a diagram illustrating an exemplary operation state of the air-saving medical negative pressure generator driven by low air pressure according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of the working state of the air-saving medical negative pressure generator under low pressure driving in the embodiment of the present invention;
FIG. 7 is a diagram illustrating an exemplary operation state of the air-saving medical negative pressure generator driven by high air pressure according to an embodiment of the present invention;
fig. 8 is a schematic diagram of the working state of the air-saving medical negative pressure generator driven by high air pressure in the embodiment of the invention.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Based on the characteristic that the size of a nozzle of the conventional medical negative pressure generator is fixedly designed, the invention can automatically limit the driving flow according to the change of the driving air pressure by innovatively introducing a throttling device under the condition of not influencing the overall appearance and the installation size of the conventional medical negative pressure generator, and the throttling device can ensure that the negative pressure generator meets the performance requirement when the medical negative pressure generator is in a low-air-pressure driving state; when the medical negative pressure generator is in a high-pressure driving state, the driving flow can be automatically limited on the premise of meeting the performance of the negative pressure generator, and the consumption and waste of driving gas are reduced.
In addition, the throttling device overcomes the problem of overlarge flow rate at high driving air pressure, can also properly improve the driving flow rate at low driving air pressure and improve the performance of the negative pressure generator at low driving air pressure, thereby improving the performance of the medical negative pressure generator and expanding the application range.
Specifically, the throttling device in the scheme is mainly formed by matching a small piston with a small sliding valve and a corresponding elastic part. The small piston is arranged on a piston assembly of the medical negative pressure generator through an elastic component, and is matched with an air passage port communicated with the jet pump, one side of the small piston is communicated with driving air, and the other side of the small piston is abutted against the elastic component and is communicated with the atmosphere; when the driving air pressure is too high, the air pressure overcomes the force of the elastic part, and the small piston is pushed to drive the slide valve to reduce the opening degree of an air port communicated with the jet pump; when the air pressure is in the normal range, the elastic component drives the small piston to reset, and the opening degree of an air port communicated with the jet pump is recovered, so that the negative pressure generator returns to the normal working state.
Accordingly, the present solution is described below by way of an embodiment.
In the embodiment, a linkage-type controlled negative pressure generator structure is adopted, and a throttling device capable of automatically limiting the driving flow according to the pressure change is additionally arranged in the differential piston.
Referring to fig. 2, a diagram of an exemplary structure of the air-saving medical negative pressure generator according to the present embodiment is shown.
As can be seen from the figure, the throttle type medical negative pressure generator mainly comprises a negative pressure generator valve body 1, a slide valve 2, a cylinder cover 3, a small piston 4, a spring 5, a small end cover 6, a plurality of sealing rings 7 and a jet pump 8 which are matched with one another in structure.
Further referring to fig. 3, there is shown a structural example of the valve body 1 in this example. The valve body 1 is a block body with a cavity inside. The upper part of the valve body 1 is a transversely through switch-shaped cavity 1-1, one end of the switch-shaped cavity has a large diameter which is a piston cavity 1-11, and the other end of the switch-shaped cavity has a small diameter which is a sliding valve cavity 1-12.
Further, the slide valve cavity is provided with an air inlet cavity 1-13 and an air outlet cavity 1-14. Wherein, the air inlet cavity 1-13 is arranged near the piston cavity 1-11, and a sealing ring groove 1-16 is arranged between each cavity and is used for arranging a corresponding sealing ring 7 so as to form an independent cavity in a sealing and isolating way when the slide valve 2 is arranged in a matching way.
Further, the air inlets 1-15 are arranged on the side surfaces of the air inlet cavities 1-13 in the embodiment and used for being externally connected with a driving air source.
Further, the present example is a vertically open jet pump chamber 1-2 at the lower portion of the valve body 1. The upper part of the jet pump cavity 1-2 is communicated with the air outlet cavity 1-14. The side surface of the middle part of the jet flow pump cavity 1-2 is provided with an air suction port (namely a negative pressure port) 1-3.
Referring to fig. 4, regarding the structure of the valve body 1, the slide valve 2 in this example is a two-section cylinder, the large end is a piston 2-1, and a seal ring groove is formed on the piston 2-1 for accommodating a corresponding seal ring 7; the small end is a piston rod 2-2, the center is a multi-section center through hole 2-3, the side close to the large end is a throttling hole part 2-3a, and the middle part of the piston rod 2-2 is provided with a radial small air inlet hole 2-21 communicated with the center hole 2-3.
Furthermore, the side of a piston rod 2-2 of the slide valve 2 is provided with a large counter bore, and the outside of the piston rod is provided with threads; the big hole section at the side of the piston rod 2-2 is provided with a small air outlet hole 2-22 leading to the outside.
Further, in the present embodiment, a radial hole 2-5 may be provided to communicate with the central hole 2-3 at the junction of the piston 2-1 and the piston rod 2-2.
The valve cover 3 in this example is a screw cover, one side is external threads, a central counter bore, and one side is an end cover with a central hole, and the central hole is a control port 3-1.
The small piston 4 in this example is adjustably seated in the large counterbore of the piston rod 2-2 on the spool valve 2 by means of a spring 5 in cooperation with a small end cap 6 to form a spool valve assembly 9 in cooperation with the spool valve 2, as shown in fig. 4.
Specifically, the small piston 4 is cylindrical, one end of the small piston is a piston 4-1, and a sealing groove is formed for accommodating a corresponding sealing ring 7; meanwhile, the end part of the piston 4-1 protrudes out of the round table; the other end of the small piston 4 is a small spool valve 4-2 of the slide valve, a counter bore is arranged in the center, a ventilation groove is arranged between the piston 4-1 and the small spool valve 4-2, and a ventilation hole 4-3 is arranged in the groove and communicated with the counter bore of the spool valve.
The spring 5 in this example is a cylindrical coil spring to ensure that a stable and reliable spring force is provided.
The small end cover 6 in this example is preferably formed by a screw cover, one side is provided with an external thread with a central counter bore 6-1, the other side is provided with a circular end cover, and the small hole 6-2 formed in the end cover is communicated with the counter bore 6-1.
The sealing rings 7 in this example are sealing rings corresponding to the specification of each sealing groove in the negative pressure generator, and matching sealing rings are arranged in each sealing groove.
The jet pump 8 in this example is preferably a gas-driven jet pump, and includes a nozzle 8-1 and a throat 8-2, and the specific structure is not limited herein and can be determined according to actual requirements.
On the basis, when the air-saving medical negative pressure generator in the example is assembled (in combination with figures 3-4):
referring to fig. 4, firstly, a small piston 4 is installed in a large piston rod counter bore of a slide valve 2, a spring 5 is sleeved on a boss at the end part of the small piston 4, a small end cover 6 is sleeved outside the spring 5 and screwed into the slide valve 2 so as to provide certain loading force for the spring 5; therefore, a spring cavity is formed between the small piston 4 and the small end cover 6, and atmospheric pressure is introduced into the spring cavity on the back side of the small piston 4 through the small hole 6-2 and the counter bore 6-1 on the small end cover 6, so that a slide valve assembly 9 is formed.
Then, the slide valve combination 9 is integrally installed in a transversely-through switch-on/off cavity 1-1 at the upper part of the valve body 1; the valve cover 3 seals the outer openings of the large piston cavities 1-11 of the valve body 1; the outer end of the piston rod of the slide valve combination 9 is communicated with the atmosphere through the switch-shaped cavity 1-1, and then the jet pump 5 is arranged in the jet pump cavity 1-2, as shown in figure 5 or 7.
The slide valve combination 9 divides the piston cavity 1-11 of the switch cavity 1-1, a piston large cavity 3-2 is formed between the outer side of the piston 2-1 and the valve cover 3, and the piston large cavity 3-2 is communicated with the control port 3-1; further, a piston rod cavity 2-10 is arranged on the inner side of the piston 2-1, and the piston rod cavity 2-10 is communicated with an air inlet cavity 1-13.
According to the arrangement, the piston large cavity 3-2, the piston rod cavity 2-10 and the slide valve 2 form a differential cylinder, and the throttling hole 2-3 controls the exhaust amount. When the control port 3-1 is closed and opened, the slide valve assembly 9 can be controlled to move left and right, a driving air source is cut off or opened, and the negative pressure generator is switched on and off to be linked with host equipment, as shown in fig. 6 or 8.
The operating state of the throttle type medical negative pressure generator formed on the basis is as follows:
referring to fig. 5 and 6, when the air pressure of the driving air source entering the air-saving medical negative pressure generator is in a low air pressure range, the air pressure acts on the small piston 4, the thrust generated by the pressure difference on the two sides of the small piston 4 is not enough to overcome the loading force of the spring 5 to push the small piston 4, the small piston 4 keeps the original position, and the driving air source directly enters the jet pump through the air inlet holes 2-21, the vent holes 4-3, the air outlet holes 2-22 and the like to drive the jet pump to normally work.
Referring to fig. 7 and 8, when the driving air source pressure entering the air-saving medical negative pressure generator is in a high pressure range, the air pressure acts on the small piston 4, at this time, the thrust generated by the pressure difference between the two sides of the small piston 4 is enough to overcome the loading force of the spring 5, the small piston 4 is pushed to move right, the small air outlet holes 2-22 are gradually shielded by the small spool 4-2 on the small piston 4, the opening of the small air outlet holes 2-22 is automatically reduced, the flow area is reduced, throttling is performed, and the flow of the driving air flow is reduced. The driving air source can enter the jet pump after being throttled by the small air outlet holes 2-22 to drive the jet pump to work.
In this state, the higher the pressure of the driving air source, the larger the right displacement of the small piston 4 is, and the smaller the opening degree of the small air outlet holes 2-22 is. The flow of the driving gas source is stabilized in a certain range and is not influenced by the driving air pressure, so that the aim of saving the driving gas during high-pressure driving is fulfilled.
On the basis, in order to prevent the driving air source from cutting off, the stroke of the small piston 4 is limited by the small end cover 6, and the minimum opening degree of the small air outlet holes 2-22 is ensured.
According to the scheme, the small piston and the slide valve are integrated in the valve rod of the switch valve of the original negative pressure generator, the air pressure acting force is balanced by the spring, and the driving air source is normally conducted when the low driving air pressure works; when the high-pressure drive works, the throttle is gradually throttled according to the pressure, the flow is reduced, the flow of the drive gas is not influenced by the drive pressure, the drive gas is stabilized in a certain range, and the aim of saving gas during the high-pressure drive is fulfilled.
In practical application, the scheme of the invention adopts an integrated control structure, does not increase the original external installation size and cost, stabilizes the flow of the driving gas of the negative pressure generator, ensures that the driving gas is not influenced by the driving gas pressure, furthest saves the driving gas and saves energy sources while ensuring the performance requirement required by negative pressure suction. Even the air can be fed to further improve the performance of negative pressure suction without consuming excessive energy.
In practical application, compared with the scheme of adding the pressure reducing valve at the inlet of the driving air source, the scheme of the invention can avoid the problems that the structure of the negative pressure generator is complicated, the appearance size is large and the installation and the use are influenced because the pressure reducing valve is added; meanwhile, the problems of increased production cost and increased maintenance cost caused by the addition of a pressure reducing valve can be avoided.
Finally, it should be noted that the solution provided by the present invention is not limited to the above-mentioned embodiments, but may be modified and varied in many ways within the scope of the appended claims or their equivalents, depending on design requirements and other factors, such as the design of the manually operated negative pressure generator, the design of the small piston, the form and position of the sealing ring, etc.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. The air-saving medical negative pressure generator comprises a negative pressure generator valve body, a piston assembly and a jet pump, wherein the differential piston assembly and the jet pump are respectively arranged in the negative pressure generator valve body; when the driving air pressure is too high, the air pressure overcomes the force of the elastic part, and the small piston is pushed to drive the slide valve to reduce the opening degree of an air port communicated with the jet pump; when the air pressure is in a normal range, the elastic component drives the small piston to reset, and the opening degree of an air port communicated with the jet pump is recovered.
2. The throttled medical negative pressure generator of claim 1, wherein said piston assembly is a differential piston assembly.
3. The throttled medical negative pressure generator of claim 2, wherein said differential piston assembly comprises a spool valve comprising a piston forming a large end and a piston rod forming a small end, said spool valve having a central bore formed therein; an air inlet communicated with the central hole is arranged at the position corresponding to the piston rod; the end part of the piston rod is provided with a large counter bore for arranging the throttling device, and the piston rod is provided with an air outlet hole communicated to the outside corresponding to the large bore section of the large counter bore.
4. The medical air throttle negative pressure generator according to claim 1, wherein an open-close shaped cavity penetrating along a first direction is arranged in the valve body, one end of the open-close shaped cavity is a piston cavity matched with the large end part of the slide valve, and the other end of the open-close shaped cavity is a slide valve cavity matched with the small end part of the slide valve; an air inlet cavity and an air outlet cavity are arranged in the sliding valve cavity, and an air inlet is arranged on the side surface of the air inlet cavity; and a jet flow pump cavity is arranged in the valve body along the second direction.
5. The air-saving medical negative pressure generator according to claim 1, wherein the small piston is cylindrical, one end of the small piston is a piston part, the end part of the small piston protrudes out of the circular truncated cone, the other end of the small piston is a small spool of the slide valve, a counter bore is arranged in the center of the small spool, a ventilation groove is arranged between the piston part and the small spool, and a ventilation hole is arranged in the ventilation groove and communicated with the counter bore on the piston rod.
6. The throttled medical negative pressure generator of claim 1, wherein the resilient member is a spring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211304869.6A CN115898972A (en) | 2022-10-24 | 2022-10-24 | Gas-saving medical negative pressure generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211304869.6A CN115898972A (en) | 2022-10-24 | 2022-10-24 | Gas-saving medical negative pressure generator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115898972A true CN115898972A (en) | 2023-04-04 |
Family
ID=86473519
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211304869.6A Pending CN115898972A (en) | 2022-10-24 | 2022-10-24 | Gas-saving medical negative pressure generator |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115898972A (en) |
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2022
- 2022-10-24 CN CN202211304869.6A patent/CN115898972A/en active Pending
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