Filter and air supply device

Abstract

The utility model provides a filter and a gas supply device, and relates to the technical field of gas treatment, the filter comprises a filter cavity, a joint, a first filter membrane and a pressing plate, the outer wall of the filter cavity is provided with a gas hole for communicating the inside and the outside of the filter cavity; the connectors and the air holes are the same in number and are in one-to-one correspondence. A channel is formed in the connector, an inlet and an outlet which are communicated with the channel are formed in the head end and the tail end of the connector respectively, and the outlet is in butt joint with the air hole; the first filter membrane is clamped between the filter cavity and the end face of the tail end of the connector, and the first filter membrane completely covers the air hole; the pressing plate is locked and connected with the filtering cavity through a locking piece, and the pressing plate acts on the connector, so that the tail end of the connector is tightly pressed with the outer wall of the filtering cavity.

Description

Technical Field

[0001] The utility model relates to the technical field of gas processing, in particular to a filter and a gas supply device. Background Art

[0002] Nitric oxide, also known as endothelial cell relaxing factor, can be produced by endothelial cells and act as a signal molecule to regulate the activities of other cells and improve the function of endothelial cells. Inhalation of a certain concentration of nitric oxide can selectively dilate pulmonary blood vessels, relax tracheal and bronchial smooth muscles, reduce pulmonary artery pressure, improve pulmonary blood flow ventilation ratio and oxygenation, and has the advantages of rapid efficacy, non-traumatic and high selectivity. It has not only been successfully used in the treatment of persistent hypoxemia and pulmonary hypertension in neonates, but has also been increasingly used in the treatment of acute respiratory distress syndrome, hypertension and some lung-related diseases in adults.

[0003] When a nitric oxide gas supply system is used clinically and connected to an invasive ventilator, a filter is usually installed to filter out nitrogen dioxide in the product.

[0004] Currently, the existing filter products of this type on the market have the problem of not being able to fully filter the gas, and there are certain defects in the structural design. For example, because the filter membrane is not sufficiently fixed, some gas can escape from around the filter membrane. Once this part of the gas is inhaled into the human body, it will cause damage. Utility Model Content

[0005] The utility model aims to provide a filter and an air supply device to alleviate the technical problem of easy air leakage at the connection between the joint and the filter cavity in the existing filter.

[0006] In a first aspect, the utility model provides a filter, comprising:

[0007] A filter cavity, wherein the outer wall of the filter cavity is provided with air holes communicating with the inside and the outside;

[0008] A connector, wherein the connector has the same number as the pores and corresponds to each other; the connector has a channel inside, and the first and last ends of the connector are respectively provided with an inlet and an outlet connected to the channel, and the outlet is connected to the pores;

[0009] A first filter membrane, wherein the first filter membrane is clamped between the filter cavity and the tail end surface of the connector, and the first filter membrane completely covers the pores;

[0010] A pressure plate is locked and connected to the filter chamber via a locking member, and the pressure plate acts on the joint to press the tail end of the joint against the outer wall of the filter chamber.

[0011] Furthermore, an annular boss arranged around the air hole is arranged on the outer wall of the filter cavity, the tail end face of the joint is an annular surface, and the annular boss and the annular surface clamp the first filter membrane.

[0012] Furthermore, a sink is provided on the outer wall of the filter cavity, the air hole is provided on the bottom surface of the sink, an annular groove is provided on the circumferential side wall of the joint, a sealing ring is provided in the annular groove, and the sealing ring abuts against the circumferential inner wall of the sink.

[0013] Furthermore, it also includes a second filter membrane, which is arranged on one side of the first filter membrane, and the filtering accuracy of the second filter membrane is lower than the filtering accuracy of the first filter membrane.

[0014] Furthermore, a first supporting foot is disposed on the inner wall of the channel, the first supporting foot faces the outlet and is spaced apart from the outlet; and the second filter membrane is disposed between the first supporting foot and the first filter membrane.

[0015] Furthermore, it also includes a third filter membrane, which is arranged on the other side of the first filter membrane, and the filtering accuracy of the third filter membrane is lower than the filtering accuracy of the first filter membrane.

[0016] Furthermore, a second supporting foot is arranged in the filter cavity, the second supporting foot faces the pore and is spaced apart from the pore; the third filter membrane is arranged between the second supporting foot and the first filter membrane.

[0017] Furthermore, there are at least two connectors, namely an air inlet connector and an air outlet connector. A filter pipeline connected to the air inlet connector and the air outlet connector at the head and tail respectively is arranged in the filter cavity, and the air inlet connector is located above the air outlet connector.

[0018] Furthermore, the number of the filtering pipelines is at least two;

[0019] And / or, at least one filter pipeline extends in a bent manner.

[0020] Furthermore, a limiting portion protruding outwardly in the circumferential direction is provided on the side wall of the tail end of the joint;

[0021] The pressure plate is provided with a through hole penetrating its front and rear surfaces, the diameter of the through hole is larger than the diameter of the head end of the connector, but smaller than the diameter of the limiting portion, so that the head end of the connector passes through the through hole and the pressure plate presses the limiting portion.

[0022] Furthermore, the pressing plate is connected to the filter chamber via screws, and the rotational forward direction of the screws is consistent with the head-to-tail direction of the joint.

[0023] In a second aspect, the utility model provides an air supply device, comprising the above-mentioned filter.

[0024] The utility model has at least the following advantages or beneficial effects:

[0025] The filter provided by the utility model comprises: a filter cavity, a joint, a first filter membrane and a pressing plate, wherein the outer wall of the filter cavity is provided with air holes connecting the inside and the outside thereof; the number of the joints is the same as that of the air holes, and they correspond one to one; the inside of the joint is provided with a channel, and the head and tail ends of the joint are respectively provided with an inlet and an outlet connecting the channel, and the outlet is butt-jointed with the air holes; the first filter membrane is clamped between the filter cavity and the tail end face of the joint, and the first filter membrane completely covers the air holes; the pressing plate is locked and connected to the filter cavity by a locking piece, and the pressing plate acts on the joint to press the tail end of the joint against the outer wall of the filter cavity.

[0026] The pressure plate is pressed on the joint, and the locking piece locks the pressure plate on the filter cavity. Under the pressing action of the pressure plate, the tail end of the joint can be tightly pressed on the outer wall of the filter cavity, thereby clamping the first filter membrane around. The gas will pass through the connection between the joint, the first filter membrane and the filter cavity to the greatest extent, avoiding gas leakage from the gap at the connection.

[0027] The air supply device provided by the utility model includes the above-mentioned filter. Since the air supply device provided by the utility model uses the above-mentioned filter, the air supply device provided by the utility model also has the advantages of the filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0029] Figure 1 A schematic diagram of a filter provided by an embodiment of the utility model;

[0030] Figure 2 A cross-sectional view of a filter provided by an embodiment of the utility model;

[0031] Figure 3 for Figure 2 A partial enlarged view of position A in the middle.

[0032] Icons: 100 - filter chamber; 110 - air hole; 120 - annular boss; 130 - second supporting foot;

[0033] 200 - connector; 211 - inlet; 212 - outlet; 220 - limiter; 230 - sealing ring; 240 - first supporting leg;

[0034] 310 - first filter membrane; 320 - second filter membrane; 330 - third filter membrane;

[0035] 400-pressure plate; 410-screw. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0037] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0039] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0041] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] like Figure 1 - Figure 3 As shown, the filter provided by the utility model includes: a filter cavity 100, a joint 200, a first filter membrane 310 and a pressing plate 400.

[0043] The filter cavity 100 has a cavity structure for accommodating filter element materials. The outer wall of the filter cavity 100 is provided with air holes 110 that connect the cavity structure and the outside world. There are at least two air holes 110. In this embodiment, the air holes 110 are the same as those of the filter cavity 100 except for their different positions. The air holes 110 can be used for air intake or air outlet, and of the two air holes 110 that are connected to each other, at least one is used for air intake and the other is used for air outlet. The specific method depends on the application.

[0044] The number of the joints 200 is the same as that of the pores 110, and they correspond one to one. The joint 200 has a channel inside, and the two ends of the joint 200 are respectively provided with an inlet 211 and an outlet 212 connected to the channel. The objects of inlet and outlet refer to the channel, that is, the inlet 211 for gas to enter the channel is the inlet, and the outlet 212 for gas to flow out is the outlet.

[0045] The outlet 212 is connected to the air hole 110 to achieve gas flow between the joint 200 and the filter cavity 100. The side wall of the tail end of the joint 200 may be provided with a limiting portion 220 protruding outward in the circumferential direction, that is, the outer wall of the joint 200 has different thicknesses, the tail end portion is thicker, and the head portion is thinner, thereby forming a stepped structure, which is convenient for the pressing plate 400 to press. Of course, in other feasible solutions, the head end face of the joint 200 can also be pressed, as long as the pressing plate 400 can press the joint 200.

[0046] The first filter membrane 310 is clamped between the filter cavity 100 and the tail end face of the connector 200, and the first filter membrane 310 completely covers the pore 110. Except for the portion covering the pore 110, the rest of the first filter membrane 310 is pressed between the outer wall of the filter cavity 100 and the tail end face of the connector 200 to form a seal.

[0047] The pressure plate 400 is locked and connected to the filter chamber 100 via a locking member, which may be a screw 410, and the rotational forward direction of the screw 410 is the head-to-tail direction of the connector 200, that is, the locking direction of the screw 410 is consistent with the clamping direction of the connector 200. By tightening the screw 410, the pressure plate 400 can be pressed against the limiting portion 220 so that the tail end of the connector 200 is pressed against the outer wall of the filter chamber 100.

[0048] The pressure plate 400 presses the limiting portion 220 on the connector 200, and the locking member locks the pressure plate 400 on the filter chamber 100. Under the pressing action of the pressure plate 400, the tail end of the connector 200 can be tightly pressed against the outer wall of the filter chamber 100, thereby clamping the first filter membrane 310 around. The gas will pass through the connection between the connector 200, the first filter membrane 310 and the filter chamber 100 to the greatest extent, avoiding gas leakage from the gap at the connection.

[0049] Specifically, an annular boss 120 is arranged on the outer wall of the filter cavity 100 and is arranged around the air hole 110. The tail end face of the joint 200 is an annular surface. The top surface of the annular boss 120 is also an annular surface. The annular boss 120 and the annular surface clamp the first filter membrane 310, and the first filter membrane 310 is tightly pressed by the two annular surfaces.

[0050] A sink is provided on the outer wall of the filter cavity 100 for accommodating the tail end of the connector 200. The air hole 110 is provided on the bottom surface of the sink. After the tail end of the connector 200 extends into the sink, the outlet 212 butts with the air hole 110. An annular groove is provided on the circumferential side wall of the connector 200. A sealing ring 230 is provided in the annular groove. The sealing ring 230 butts against the circumferential inner wall of the sink to further improve the radial sealing effect.

[0051] In this embodiment, the inner wall of the channel is provided with a first support foot 240, the support surface of the first support foot 240 is annular, the first support foot 240 faces the outlet 212 and is spaced from the outlet 212, a second filter membrane 320 is provided between the first support foot 240 and the first filter membrane 310, and the filtering accuracy of the second filter membrane 320 is lower than the filtering accuracy of the first filter membrane 310, so that a rough filter is formed between the joint 200 and the first filter membrane 310, and the gas flowing from the joint 200 to the filter cavity 100 will pass through the first filter membrane 310 after being roughly filtered at the second filter membrane 320, thereby extending the life of the first filter membrane 310. Of course, the second filter membrane 320 may not be provided between the first support foot 240 and the first filter membrane 310, but at other positions, as long as the second filter membrane 320 is located on the gas flow path and can play a filtering effect.

[0052] Similarly, a second support foot 130 is provided in the filter cavity 100, the support surface of the second support foot 130 is annular, the second support foot 130 faces the air hole 110 and is spaced from the air hole 110; a third filter membrane 330 is provided between the second support foot 130 and the first filter membrane 310, the third filter membrane 330 is pressed, and the filtering accuracy of the third filter membrane 330 is lower than the filtering accuracy of the first filter membrane 310. Thus, a rough filter is formed between the filter cavity 100 and the first filter membrane 310, and the gas flowing from the filter cavity 100 to the joint 200 will pass through the first filter membrane 310 after being roughly filtered at the third filter membrane 330, thereby extending the life of the first filter membrane 310. Of course, the third filter membrane 330 may not be provided between the second support foot 130 and the first filter membrane 310, but at other positions, as long as the third filter membrane 330 is located on the gas flow path and can play a filtering effect.

[0053] The filtering accuracies of the second filter membrane 320 and the third filter membrane 330 may be the same or different.

[0054] The filter has at least two joints 200, which are an air inlet joint 200 and an air outlet joint 200. The filter cavity 100 is provided with a filter pipeline connected to the air inlet joint 200 and the air outlet joint 200 at the head and tail, respectively, and the air inlet joint 200 is located above the air outlet joint 200. In this embodiment, the filter cavity 100 has two filter pipelines, and four joints 200 are correspondingly arranged on the filter cavity 100, two of which are air inlet joints 200 and the other two are air outlet joints 200. The two filter pipelines are filled with filter element materials, and the air inlet joint 200 and the air outlet joint 200 are arranged in an upper and lower manner to prevent nitric oxide from being oxidized into nitrogen dioxide. The filter is placed vertically, and the filter material will be deposited at the bottom due to gravity. There may be a cavity above. The air outlet connector 200 is set at a lower position. The gas needs to fully pass through the filter material before it can flow out from the air outlet connector 200, and avoid contact with the filter element cavity as much as possible (the gas is lighter and easier to flow upward, and reacts with O2 in the cavity to produce harmful gas NO2).

[0055] Furthermore, in order to increase the contact time and area between the gas and the filter element material, the filter pipeline can be set to be bent and extended, and the bent filter pipeline includes multiple branches extending horizontally and branches extending vertically, and the ends of each branch are connected in sequence.

[0056] The pressing plate 400 is provided with through holes penetrating the front and rear surfaces thereof, the diameter of the through holes being larger than the diameter of the head end of the connector 200, but smaller than the diameter of the stopper 220. In this embodiment, the number of through holes is four, the head end of the connector 200 passes through the through holes, the stopper 220 cannot pass through the through holes, and the pressing plate 400 presses the stopper 220. The pressing plate 400 is connected to the filter chamber 100 by screws 410.

[0057] The filter can be used in a nitric oxide therapy device.

[0058] Multiple independent filter lines can be set in the filter, such as Figure 1 The filter pipelines indicated by the arrows and dotted arrows are respectively implemented, and different filter elements are filled in different filter pipelines, thereby achieving different gas processing functions. Taking the application in nitric oxide therapeutic apparatus as an example, the filter pipeline indicated by the arrow is filled with calcium lime particles, and the filter pipeline indicated by the dotted arrow is filled with potassium permanganate particles.

[0059] The air supply device provided by the utility model includes the above-mentioned filter. Since the air supply device provided by the utility model uses the above-mentioned filter, the air supply device provided by the utility model also has the advantages of the filter.

[0060] Specifically, the gas supply device can be a nitric oxide therapeutic device, including a nitric oxide preparation unit, a filter, and a gas output device. The filter is connected to the downstream of the nitric oxide preparation unit and is used to process the product gas from the nitric oxide preparation unit. Generally, it flows in from the upper joint 200 of the filter and is discharged from the lower joint 200. The internal one-way flow passes through a tortuous filter pipe. Both the inflow and outflow are first subjected to coarse filtration (the second filter membrane 320 and the third filter membrane 330, the material is, for example, electrostatic cotton) and fine filtration (the first filter membrane 310, the material is, for example, HEPA membrane) to ensure the cleanliness of the inflow gas and the outflow gas. The filtration of the inflow gas improves the cleanliness of the internal filter element and increases the service life of the first filter membrane 310; it first flows through coarse filtration and then flows through fine filtration to avoid dust particles clogging the first filter membrane 310.

[0061] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A filter, characterized in that: include: A filter cavity (100), wherein an air hole (110) communicating with the inside and outside of the filter cavity (100) is provided on the outer wall of the filter cavity (100); A connector (200), wherein the connector (200) and the air holes (110) are of the same number and correspond one to one; a channel is provided inside the connector (200), and an inlet (210) and an outlet (212) communicating with the channel are respectively provided at the head and tail ends of the connector (200), and the outlet (212) is butt-jointed with the air holes (110); A first filter membrane (310), wherein the first filter membrane (310) is clamped between the filter cavity (100) and the tail end surface of the connector (200), and the first filter membrane (310) completely covers the pore (110); A pressure plate (400) is locked and connected to the filter chamber (100) via a locking member, and the pressure plate (400) acts on the joint to press the tail end of the joint (200) against the outer wall of the filter chamber (100).

2. The filter according to claim 1, characterized in that An annular boss (120) is arranged on the outer wall of the filter cavity (100) and is arranged around the air hole (110); the tail end face of the joint (200) is an annular surface; the annular boss (120) and the annular surface clamp the first filter membrane (310).

3. The filter according to claim 1, characterized in that A sink is provided on the outer wall of the filter cavity (100), the air hole (110) is provided on the bottom surface of the sink, an annular groove is provided on the circumferential side wall of the joint (200), a sealing ring (230) is provided in the annular groove, and the sealing ring (230) abuts against the circumferential inner wall of the sink.

4. The filter according to claim 1, characterized in that It also includes a second filter membrane (320) which is arranged on one side of the first filter membrane (310), and the filtering accuracy of the second filter membrane (320) is lower than the filtering accuracy of the first filter membrane (310).

5. The filter according to claim 4, characterized in that A first supporting foot (240) is provided on the inner wall of the channel, and the first supporting foot (240) faces the outlet (212) and is spaced apart from the outlet (212); the second filter membrane (320) is provided between the first supporting foot (240) and the first filter membrane (310).

6. The filter according to claim 1, characterized in that It also includes a third filter membrane (330) which is arranged on the other side of the first filter membrane (310), and the filtering accuracy of the third filter membrane (330) is lower than the filtering accuracy of the first filter membrane (310).

7. The filter according to claim 6, characterized in that A second supporting foot (130) is arranged in the filter cavity (100), and the second supporting foot (130) faces the air hole (110) and is arranged at a distance from the air hole (110); the third filter membrane (330) is arranged between the second supporting foot (130) and the first filter membrane (310).

8. The filter according to any one of claims 1 to 7, characterized in that: There are at least two connectors (200), namely an air inlet connector (200) and an air outlet connector (200), and a filter pipeline connected to the air inlet connector (200) and the air outlet connector (200) at the head and tail ends thereof is arranged in the filter cavity (100), and the air inlet connector (200) is located above the air outlet connector (200).

9. The filter according to claim 8, characterized in that The number of the filtering pipelines is at least two; And / or, at least one filter pipeline extends in a bent manner.

10. The filter according to any one of claims 1 to 7, characterized in that: A limiting portion (220) protruding outwardly in the circumferential direction is provided on the side wall of the tail end of the joint (200); The pressing plate (400) is provided with through holes penetrating its front and rear surfaces, and the diameter of the through holes is larger than the diameter of the head end of the connector (200) but smaller than the diameter of the limiting portion (220), so that the head end of the connector (200) passes through the through holes and the pressing plate (400) presses the limiting portion (220).

11. The filter according to claim 10, characterized in that The pressing plate (400) is connected to the filter cavity (100) via a screw (410), and the rotational forward direction of the screw is consistent with the head-to-tail direction of the joint.

12. An air supply device, characterized in that: A filter comprising the filter according to any one of claims 1 to 11.

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