Electromagnetic valve with special airway structure for oxygen generator

Abstract

A valve body comprises an electromagnetic seat, a valve seat and a valve rod piece, the valve seat is provided with a valve rod channel and a plurality of air ports, an electromagnetic structure for driving the valve rod piece to move relative to the valve seat is arranged in the electromagnetic seat, and an air inlet P is provided with an air channel C communicated with one end of the valve rod piece; after ventilation, the valve rod piece is driven to move towards one side of the electromagnetic seat; the valve rod piece is provided with a reset spring A and a reset spring B which are used for maintaining the valve rod piece to be static in the middle section of the stroke when the electromagnetic structure is powered off and the air inlet P is externally connected with an air source and does not supply air. The valve body is provided with a gas flow channel A and a gas flow channel B, and residual waste gas in the flow channels is exhausted when the valve rod piece moves; according to the electromagnetic valve of the oxygen generator, when the air channels are switched by arranging the air flow channels, waste gas in the air channels is extracted, the waste gas flowing back to the molecular sieve is reduced, the reset spring is arranged to enable the valve rod piece to keep a closed air port state when the valve rod piece is in a standby state, and the situation that air flows back to the molecular sieve from the electromagnetic valve to affect the use performance of the molecular sieve is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of solenoid valves for oxygen concentrators, and in particular to an airway structure solenoid valve for oxygen concentrators. Background Art

[0002] Oxygen is an essential resource for human survival. It plays a very important role in daily life, especially in the treatment of diseases or first aid. At first, people stored the prepared oxygen in cylinders at low temperature and pressure for emergency use, but it was inconvenient to use. Therefore, oxygen concentrators came into being. Oxygen concentrators can not only be used for disease treatment or first aid, but also for healthy people who often breathe oxygen to promote health and improve work efficiency.

[0003] In the existing oxygen concentrator, a solenoid valve is generally used to control the input of compressed gas and the discharge of waste gas denitrified by the molecular sieve. In the existing oxygen concentrator, the oxygen concentrator is in a power-off state, that is, a non-working state. Based on the stop position of the solenoid valve when the power is off, one of the general air inlet flow channels will be in an open state connected to the outside world. Therefore, moisture in the air can penetrate into the molecular sieve through the air inlet, thereby causing the performance of the oxygen concentrator to decrease. In addition, in the airway of the common oxygen concentrator solenoid valve, air and waste gas will be discharged from the same channel. After the airway switching of the common solenoid valve is completed, some undischarged waste gas will still remain in the flow channel cavity. At this time, when air is introduced from the discharge side, this part of the waste gas will be mixed with the compressed air and refluxed to the molecular sieve for a second time. The nitrogen content in this part of the waste gas is relatively high, and it is also adsorbed by the molecular sieve after reflux, which leads to a decrease in the adsorption and filtration effect of the molecular sieve on the compressed air. Therefore, it is necessary to develop an oxygen concentrator solenoid valve structure that can avoid the above problems. Summary of the invention

[0004] In view of the prior art, the purpose of the present invention is to provide a solenoid valve with an airway structure, which can reduce the problem of repeated adsorption of exhaust gas reflux during the operation of the oxygen generator, and set spring devices at both ends of the valve stem to keep its air port closed and isolated in the standby state.

[0005] In order to achieve the above purpose, the technical solution adopted by the present invention is: an airway structure electromagnetic valve for an oxygen concentrator, comprising a valve body, the valve body comprising an electromagnetic seat, a valve seat and a valve stem, a valve stem path and a plurality of air ports radially connected to the valve stem path are arranged in the valve seat, an electromagnetic structure is arranged in the electromagnetic seat to drive the valve stem to move relative to the valve seat, the air ports connected to the valve stem path include a nitrogen exhaust port S, an air outlet A, an air inlet P, an air outlet B and a nitrogen exhaust port R located at a side opening of the valve seat, a plurality of air sealing rings are arranged on the valve stem for switching the relative connection state of the air ports during the activity; an air cavity is arranged on the valve seat, one end of the valve stem extends into the air cavity and is provided with a return spring A for pushing the valve stem to move toward the electromagnetic seat, a piston groove is arranged on the electromagnetic seat, a piston member is arranged at the other end of the valve stem corresponding to the piston groove, and a piston member is abutted on the end surface of the piston member with a spring for pushing A return spring B moves the valve stem toward the valve seat, and the return spring A and the return spring B are used to maintain the valve stem stationary in the middle of its stroke when the electromagnetic structure is powered off and the air inlet P is not supplied with air from an external air source; the piston groove is also provided with an air flow channel A and an air flow channel B, which are respectively connected to the air outlet A and the air outlet B, and the openings of the air flow channel A and the air flow channel B are respectively arranged on the groove walls at both ends of the piston groove relative to the piston stroke, and the air flow channel A and the air flow channel B are both provided with a one-way flow channel structure; a piston head is fixed to one end of the valve stem located in the air cavity, and the air cavity is also provided with an air channel C connected to the air inlet P; after the external air source is ventilated, the valve stem is switched on and off by the electromagnetic structure, and after power is off, the valve stem is driven by air pressure to move toward the valve seat, and after the electromagnetic structure is energized, it is electromagnetically moved toward the electromagnetic seat for airway connection switching of the valve.

[0006] As a further configuration of the above scheme, the power of the electromagnetic structure after being energized is greater than the driving force of the external gas source on the valve stem, and the return spring A and the return spring B are fixed to the valve stem at one end, and are used to drive the valve stem to form isolation for the nitrogen exhaust port S, the air outlet A, the air inlet P, the air outlet B and the nitrogen exhaust port R in the valve stem channel when the electromagnetic structure is powered off and the external gas source does not supply air.

[0007] As a further configuration of the above scheme, the piston groove is divided into an upper chamber and a lower chamber by a movable piston member, the air flow channel A and the air flow channel B correspond to the upper chamber and the lower chamber respectively, and a one-way exhaust port is provided in the upper chamber and the lower chamber, and the one-way exhaust port is used to discharge the gas in the corresponding upper chamber and the lower chamber.

[0008] As a further configuration of the above solution, the one-way exhaust port and the one-way flow channel structure include a plug for blocking the air flow channel and a one-way blocking spring.

[0009] As a further configuration of the above scheme, the electromagnetic structure includes an electromagnetic coil, an iron core and a top spring for driving the iron core to elastically return to move away from the valve seat. The iron core is arranged opposite to the valve stem. When the electromagnetic coil is energized, it drives the iron core to approach and abut the valve stem to push it toward the valve seat.

[0010] As a further configuration of the above scheme, six embedding grooves for gas sealing rings are arranged on the valve stem, and the nitrogen exhaust port S, air outlet A, air inlet P, air outlet B and nitrogen exhaust port R each correspond to a gap between two adjacent embedding grooves.

[0011] Beneficial Effects

[0012] The solenoid valve of the oxygen concentrator of the present invention is connected to the piston structure in the valve body by setting the structure of the air flow channel, forming a negative pressure when switching the air channel, and extracting the air in the air channel. This part of the air will first extract the high-nitrogen concentration waste gas before the compressed air comes in until the pressure is balanced. The extraction of this part of the high-nitrogen concentration waste gas can reduce the mixing of the compressed air back to the molecular sieve, resulting in secondary adsorption affecting the filtration capacity of the molecular sieve; By arranging return springs at both ends of the valve stem, the valve stem is pushed by the return springs to keep the air port in a closed state when the valve stem is in standby state, thereby preventing air from flowing back from the solenoid valve to the molecular sieve to affect its performance, reducing the influence of external air moisture on the molecular sieve and extending its service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the solenoid valve for the oxygen concentrator of the present invention.

[0014] Figure 2 It is a schematic diagram of the internal structure of the solenoid valve of the oxygen concentrator of the present invention.

[0015] Figure 3 This is a schematic diagram of the oxygen concentrator of the present invention in standby state.

[0016] Figure 4 This is a schematic diagram of the solenoid valve structure of the present invention when the solenoid structure is energized.

[0017] Figure 5 This is a schematic diagram of the electromagnetic valve of the present invention being powered off and connected to an external gas source.

[0018] : 1. valve body; 2. electromagnetic seat; 21. electromagnetic structure; 211. electromagnetic coil; 212. iron core; 213. top spring; 22. piston groove; 221. air flow channel A; 222. air flow channel B; 223. one-way flow channel structure; 224. upper chamber; 225. lower chamber; 226. one-way exhaust port; 227. one-way plugging spring; 228. plug; 3. valve seat; 31. valve stem channel; 311. nitrogen exhaust port S; 312. air outlet A; 313. air inlet P; 314. air outlet B; 315. nitrogen exhaust port R; 35. air channel C; 36. piston head; 37. air cavity; 4. valve stem member; 41. return spring A; 42. piston member; 43. return spring B; 45. air sealing ring; 49. embedded groove. DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] like Figure 1-Figure 5 The solenoid valve of the airway structure for an oxygen concentrator shown in the figure comprises a valve body 1, wherein the valve body 1 comprises an electromagnetic seat 2, a valve seat 3 and a valve stem 4, wherein a valve stem path 31 and a plurality of air ports radially connected to the valve stem path 31 are arranged in the valve seat 3, and an electromagnetic structure is arranged in the electromagnetic seat 2 to drive the valve stem 4 to move relative to the valve seat 3. The gas ports connected to the valve stem channel 31 include a nitrogen exhaust port S311, an air outlet A312, an air inlet P313, an air outlet B314 and a nitrogen exhaust port R315 located at the side opening of the valve seat 3. The valve stem 4 is provided with a plurality of gas sealing rings 45 for switching the relative connection state of the gas ports during the activity. The valve seat 3 is provided with an air cavity 37, one end of the valve stem 4 extends into the air cavity 37 and is provided with a return spring A41 for pushing the valve stem 4 to move toward the electromagnetic seat 2, the electromagnetic seat 2 is provided with a piston groove 22, the other end of the valve stem 4 is provided with a piston 42 corresponding to the piston groove 22, and the end surface of the piston 42 is abutted with a return spring B43 for pushing the valve stem 4 to move toward the valve seat 3, and the return spring A41 and the return spring B43 are used to maintain the valve stem 4 stationary in the middle of its stroke when the electromagnetic structure is powered off and the air source connected to the air inlet P313 is not supplied with air; The piston groove 22 is also provided with an air flow channel A221 and an air flow channel B222 which are respectively connected to the air outlet A312 and the air outlet B314. The openings of the air flow channel A221 and the air flow channel B222 are respectively arranged at the groove walls at both ends of the piston groove 22 relative to the stroke of the piston member 42. The air flow channel A221 and the air flow channel B222 are both provided with a one-way flow channel structure 223. A piston head 36 is fixed to one end of the valve stem 4 located in the air cavity 37. The air cavity 37 is also provided with an air passage C35 connected to the air inlet P313. After the external air source is ventilated, the valve stem 4 is switched on and off by the electromagnetic structure. After the power is off, the valve stem 4 is driven by the air pressure to move toward the valve seat 3. After the electromagnetic structure is energized, it moves toward the electromagnetic seat 2 under the influence of the electromagnetic to switch the airway connection of the valve.

[0021] As a further arrangement of the above scheme, the power of the electromagnetic structure after being energized is greater than the driving force of the external gas source on the valve stem 4, and the return spring A41 and the return spring B43 are fixed to the valve stem 4 at one end, and are used to drive the valve stem 4 to form isolation for the nitrogen exhaust port S311, the air outlet A312, the air inlet P313, the air outlet B314 and the nitrogen exhaust port R315 in the valve stem channel 31 when the electromagnetic structure is powered off and the external gas source does not supply air.

[0022] As a further arrangement of the above scheme, the piston groove 22 is divided into an upper chamber 224 and a lower chamber 225 by a movable piston member 42, the air flow channel A221 and the air flow channel B222 correspond to the upper chamber 224 and the lower chamber 225 respectively, and a one-way exhaust port 226 is provided in the upper chamber 224 and the lower chamber 225, the one-way exhaust port 226 is used to discharge the gas corresponding to the upper chamber 224 and the lower chamber 225, the one-way exhaust port 226 and the one-way flow channel structure 223 include a plug 228 and a one-way blocking spring 227 for blocking the air flow channel, and the one-way exhaust port 226 is also connected to the nitrogen exhaust port R315 or the nitrogen exhaust port S311, and it is also worth noting that the diameter of the one-way exhaust port 226 is smaller than that of the air flow channel A221 and the air flow channel B222.

[0023] As a further configuration of the above scheme, the electromagnetic structure includes an electromagnetic coil 211, an iron core 212 and a top spring 213 for driving the iron core 212 to elastically return to move away from the valve seat 3. The iron core 212 is arranged opposite to the valve stem 4. When the electromagnetic coil 211 is energized, it drives the iron core 212 to approach and abut the valve stem 4 to push it toward the valve seat 3.

[0024] As a further configuration of the above scheme, six embedding grooves 49 for the gas sealing ring 45 are arranged on the valve stem 4, and the nitrogen exhaust port S311, the air outlet A312, the air inlet P313, the air outlet B314 and the nitrogen exhaust port R315 respectively correspond to the gap between two adjacent embedding grooves 49, the air port distance of the nitrogen exhaust port S311, the air outlet A312, the air inlet P313, the air outlet B314 and the nitrogen exhaust port R315 and the spacing between the two embedding grooves 49 corresponding to the nitrogen exhaust port S311 and the nitrogen exhaust port R315 are d, the telescopic distance of the valve stem 4 is a, the size a is smaller than the size d, the spacing between the two embedding grooves 49 corresponding to the air inlet P313 is c, the axial size of the air inlet P313 relative to the valve stem 4 is b, and the size c is greater than or equal to the size b.

[0025] The air port design of the present invention and the airway connection switching are as follows Figure 3-Figure 5 As shown, the air port distances of the nitrogen exhaust port S311, the air outlet A312, the air inlet P313, the air outlet B314, and the nitrogen exhaust port R315, and the spacing between the two embedded grooves 49 corresponding to the nitrogen exhaust port S311 and the nitrogen exhaust port R315 are set to d, the telescopic distance of the valve stem 4 is a, and the size a is smaller than the size d, so that the sealing can be ensured during switching, the spacing between the two embedded grooves 49 corresponding to the air inlet P313 is c, and the axial size of the air inlet P313 relative to the valve stem 4 is b, and the size c is greater than or equal to the size b. As set above, the valve stem 4 of the present invention can well ensure the isolation seal and smooth communication between the air ports at the front dead point and the rear dead point of the axial activity and the intermediate standby position, ensuring that there will be no leakage or cross-gas problems.

[0026] The solenoid valve of the present invention is as follows Figure 1 The valve body 1 shown is divided into a valve seat 3 part and an electromagnetic seat 2 part, a valve stem channel 31 is arranged between the electromagnetic seat 2 and the valve seat 3, and the valve stem member 4 is penetrated in the valve stem channel 31. Referring to the above structural function description, ① the electromagnetic valve of the present invention can drive the valve stem member 4 to move downward through the electromagnetic structure in the electromagnetic seat 2, and ② further, an air channel C35 is drilled on the valve seat 3. When the air is supplied by an external air source and the electromagnetic coil 211 is not energized, the high air pressure of the compressed air supplied by the external air source enters the air cavity 37 and pushes the valve stem member 4 to move upward. Under the on-off control of the electromagnetic coil 211, the above ①② forms the up-and-down movement of the valve stem member 4 to switch the molecular sieve adsorption and desorption, forming the following Figure 4 and Figure 5 The switching change of the air flow channel shown in the figure can achieve the effect of adsorbing nitrogen on one side of the molecular sieve and discharging nitrogen on the other side. The technical principle of the molecular sieve for adsorption and denitrification can basically refer to the principle of the pressure swing adsorption oxygen generator in the prior art.

[0027] For further reference, Figure 1-Figure 2The nitrogen exhaust port S311, air outlet A312, air inlet P313, air outlet B314 and nitrogen exhaust port R315 of the present invention are arranged in sequence along the telescopic direction of the valve stem 4. An air sealing ring 45 is provided on the valve stem 4 to seal and isolate the air port. When the valve stem 4 is driven by the electromagnetic structure and the airflow to realize axial movement, the connection switching of the air port is realized. Compared with the prior art, the airway structure solenoid valve of this embodiment has top spring structures respectively provided at both ends of the valve stem 4. When in use, the top spring structure is driven by the electromagnetic structure and the airflow, and it basically does not play a role in the entire system, that is, the axial movement of the valve stem 4 is driven by the electromagnetic structure and the airflow, and when the equipment is in standby and non-working state, the external air source stops supplying air, and the electromagnetic structure stops working. In this state, the top spring structures at both ends of the valve stem 4, that is, located Figure 3 The return spring A41 at the lower end of the valve stem 4 shown cooperates with the return spring B43 at the upper end to push the valve stem 4 to the middle position, isolating and closing the above five air ports from each other, thereby preventing the gas from the nitrogen exhaust port S311, the air inlet P313 or the nitrogen exhaust port R315 from entering the molecular sieve connected to the air outlet A312 and the air outlet B314 when the equipment is not working. The purpose is to reduce the influence of the relatively humid air entering from the nitrogen exhaust port S311 or the nitrogen exhaust port R315 on the dryness of the molecular sieve, so as to avoid affecting the service life of the molecular sieve.

[0028] In addition, as in the above-mentioned structure, the solenoid valve of this embodiment also has an air passage provided therein, including an air passage A221 and an air passage B222. Figure 4-Figure 5In the cyclic switching process, the principle of the molecular sieve of the pressure swing adsorption oxygen generator is known, including that when the molecular sieve on one side is adsorbing nitrogen, the other side is performing pressure swing denitrification, so that it can be restored to the state before adsorption, and at the same time, the high-concentration nitrogen waste gas released by the molecular sieve will be discharged by the valve stem 4 switching the airway and connecting the corresponding nitrogen exhaust port. However, it is worth noting that the compressed air flow airway during adsorption and the exhaust gas backflow entering the nitrogen exhaust port during desorption partially overlap, which results in residual exhaust gas in the overlapping airway cavity between the molecular sieve and the valve stem 4 when the valve stem 4 switches the connecting airway. During the use of the solenoid valve of the existing ordinary oxygen generator, the newly filled compressed air will bring this part of the exhaust nitrogen back to the molecular sieve, so that the molecular sieve that originally only needs to denitrify the air needs to mix and receive this part of the high-nitrogen concentration. Exhaust gas, reduces the adsorption upper limit and efficiency and increases the workload of the molecular sieve; therefore, the present invention is further improved, by combining the active working principle of the solenoid valve itself, an air flow channel is added, namely, air flow channel A221 and air flow channel B222, and the piston groove 22 arranged on the valve stem 4 is in motion, and the air outlet A312 and the air outlet B314 are unidirectionally connected through the air flow channel A221 or the air flow channel B222. When the valve stem 4 is active, a negative pressure is formed in the piston groove 22 through the piston member 42, and the exhaust gas remaining in the air outlet A312 and the air outlet B314 is extracted, and based on the structure of the piston groove 22 and the piston member 42, the exhaust gas extracted in the previous step on the other side is discharged outwardly, and the circulation reduces the exhaust gas at the air outlet A312 and the air outlet B314 intercepted by the activity of the valve stem 4, avoids the exhaust gas from re-entering the molecular sieve, and improves the efficiency of the molecular sieve of the oxygen generator.

[0029] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. An airway structure electromagnetic valve for an oxygen concentrator, comprising a valve body (1), the valve body (1) comprising an electromagnetic seat (2), a valve seat (3) and a valve stem (4), the valve seat (3) being provided with a valve stem path (31) and a plurality of air ports radially connected to the valve stem path (31), the electromagnetic seat (2) being provided with an electromagnetic structure for driving the valve stem (4) to move relative to the valve seat (3), characterized in that: The gas ports connected to the valve stem channel (31) include a nitrogen exhaust port S (311) located at a side opening of the valve seat (3), an air outlet A (312), an air inlet P (313), an air outlet B (314) and a nitrogen exhaust port R (315); the valve stem member (4) is provided with a plurality of gas sealing rings (45) for switching the relative connection state of the gas ports during movement; The valve seat (3) is provided with an air cavity (37), one end of the valve stem (4) extends into the air cavity (37) and is provided with a return spring A (41) for pushing the valve stem (4) toward the electromagnetic seat (2), the electromagnetic seat (2) is provided with a piston groove (22), the other end of the valve stem (4) is provided with a piston member (42) corresponding to the piston groove (22), and the end surface of the piston member (42) is abutted with a return spring B (43) for pushing the valve stem (4) toward the valve seat (3), and the return spring A (41) and the return spring B (43) are used to maintain the valve stem (4) stationary in the middle of its stroke when the electromagnetic structure is powered off and the air source connected to the air inlet P (313) is not supplied with air; The piston groove (22) is also provided with an air flow channel A (221) and an air flow channel B (222) which are respectively connected to the air outlet A (312) and the air outlet B (314); the openings of the air flow channel A (221) and the air flow channel B (222) are respectively arranged at the groove walls at both ends of the piston groove (22) relative to the stroke of the piston member (42); and the air flow channel A (221) and the air flow channel B (222) are both provided with a one-way flow channel structure (223); A piston head (36) is fixed to one end of the valve stem (4) located in the air cavity (37); the air cavity (37) is also provided with an air passage C (35) connected to the air inlet P (313); After the valve stem (4) is connected to an external gas source for ventilation, the power is switched on and off through the electromagnetic structure. After the power is off, the valve stem (4) is driven by the gas pressure to move toward the valve seat (3). After the electromagnetic structure is energized, it is electromagnetically driven to move toward the electromagnetic seat (2) for the valve to switch the airway connection.

2. The airway structure solenoid valve for an oxygen concentrator according to claim 1, characterized in that: The power of the electromagnetic structure after being energized is greater than the driving force of the external gas source on the valve stem (4); the return spring A (41) and the return spring B (43) are both fixedly arranged at one end to the valve stem (4) and are used to drive the valve stem (4) to form isolation of the nitrogen exhaust port S (311), the gas outlet A (312), the gas inlet P (313), the gas outlet B (314) and the nitrogen exhaust port R (315) in the valve stem channel (31) when the electromagnetic structure is powered off and the external gas source does not supply gas.

3. The airway structure solenoid valve for an oxygen concentrator according to claim 1, characterized in that: The piston groove (22) is divided into an upper chamber (224) and a lower chamber (225) by a movable piston member (42); the gas flow channel A (221) and the gas flow channel B (222) correspond to the upper chamber (224) and the lower chamber (225) respectively; and one-way exhaust ports (226) are provided in the upper chamber (224) and the lower chamber (225); the one-way exhaust ports (226) are used to exhaust the gas in the corresponding upper chamber (224) and the lower chamber (225).

4. The airway structure solenoid valve for an oxygen concentrator according to claim 3, characterized in that: The one-way exhaust port (226) and the one-way flow channel structure (223) include a plug (228) for blocking the air flow channel and a one-way blocking spring (227).

5. The airway structure solenoid valve for an oxygen concentrator according to claim 1, characterized in that: The electromagnetic structure comprises an electromagnetic coil (211), an iron core (212), and a top spring (213) for driving the iron core (212) to elastically return to move away from the valve seat (3); the iron core (212) and the valve stem (4) are arranged opposite to each other; when the electromagnetic coil (211) is energized, the iron core (212) is driven to approach and abut the valve stem (4) to push the valve stem (4) toward the valve seat (3).

6. The airway structure solenoid valve for an oxygen concentrator according to claim 1, characterized in that: The valve stem (4) is provided with six embedding grooves (49) for the gas sealing ring (45), and the nitrogen exhaust port S (311), the gas outlet A (312), the gas inlet P (313), the gas outlet B (314) and the nitrogen exhaust port R (315) each correspond to a gap between two adjacent embedding grooves (49).

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