Pilot-operated four-way valve compatible with negative pressure swing adsorption oxygen generator and oxygen generator

Abstract

The utility model belongs to the technical field of oxygen generator equipment, and particularly relates to a pilot-operated four-way valve compatible with a negative pressure swing adsorption oxygen generator and the oxygen generator. The pilot-operated type four-way valve comprises a main valve body and two pilot-operated valves, and the main valve body is controlled by the pilot-operated valves to be opened and closed under a certain pressure condition. According to the pilot-operated type four-way valve, exhaust gas of the pilot valve and exhaust gas of the main valve body are exhausted through an external exhaust port of the four-way valve, the pressure environment where the pilot gas is exhausted and the pressure environment where the exhaust position of the main valve is located are kept consistent, and no noise is generated.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of oxygen generator equipment, and particularly relates to a pilot four-way valve compatible with a negative pressure pressure swing adsorption oxygen generator and an oxygen generator. BACKGROUND

[0002] The pilot gas exhaust of the existing atmospheric pressure pressure swing adsorption oxygen generator four-way valve is directly exhausted to the atmosphere, so that the four-way valve external exhaust port can only be exhausted to the atmosphere; the pilot gas is directly exhausted to the atmosphere, and noise of the pilot gas exhaust is generated. If the pressure environment of the four-way valve external exhaust port and the two-position three-way pilot valve exhaust port is inconsistent, the pilot gas pressure acting chamber in the main valve and the main valve exhaust chamber pressure are different when the exhaust is performed, so that the valve core in the four-way valve cannot be normally reset. If applied in the negative pressure pressure swing adsorption oxygen system, the pressure environment of the pilot gas exhaust is standard atmospheric pressure after the two-position three-way pilot valve exhaust is opened, the pressure environment of the four-way valve external exhaust port is negative pressure environment, the pilot gas rubber pad is still affected by the pressure difference on both sides, the valve core shaft cannot be normally reset, and the valve cannot realize the normal function. SUMMARY

[0003] The utility model discloses a pilot four-way valve compatible with a negative pressure pressure swing adsorption oxygen generator, which overcomes the defects of the prior art and solves the problem that the existing oxygen generator pilot four-way valve cannot be applied in the negative pressure pressure swing adsorption oxygen system. The pilot four-way valve can also be applied in the atmospheric pressure pressure swing adsorption oxygen generator without generating noise.

[0004] To achieve the above object, the utility model adopts the following technical scheme:

[0005] A pilot four-way valve compatible with a negative pressure pressure swing adsorption oxygen generator, which comprises an inlet side end cover, an inlet side sealing ring, a main valve body, a valve core shaft spring, a valve core shaft, a valve core shaft sealing rubber pad, a valve core shaft sealing ring, an exhaust side valve body, an exhaust side sealing ring, a pusher, a pilot gas rubber pad, an exhaust side end cover and a pilot valve.

[0006] The main valve body is divided into a main valve inlet chamber, a main valve outlet chamber, a main valve exhaust chamber, a main valve pilot gas exhaust chamber and a pilot gas pressure acting chamber; the main valve inlet chamber is communicated with an external inlet; the main valve inlet chamber is communicated with a pilot valve inlet through a pilot gas inlet channel; the main valve outlet chamber is communicated with an external outlet.

[0007] A main valve internal inlet is arranged between the main valve inlet chamber and the main valve outlet chamber; a main valve internal exhaust is arranged between the main valve outlet chamber and the main valve exhaust chamber.

[0008] The main valve exhaust chamber is communicated with a pilot valve exhaust port through a pilot gas exhaust passage; the pilot valve exhaust port is communicated with a pilot gas pressure acting chamber through a pilot gas exhaust passage; the main valve exhaust chamber is communicated with an external exhaust port;

[0009] The main valve body is provided with an air inlet side end cover and an exhaust side end cover on two sides thereof, and an air inlet side sealing ring is arranged between the air inlet side end cover and the main valve body; a valve core shaft sealing ring is arranged between the exhaust side valve body and the main valve body, and an exhaust side sealing ring is arranged between the exhaust side valve body and the pilot gas rubber pad;

[0010] The valve core shaft is sleeved with a valve core shaft sealing rubber pad, one end of the valve core shaft sealing rubber pad passes through a main valve internal air inlet port through a valve core shaft spring and is elastically connected to a valve core shaft spring seat arranged on the air inlet side end cover, and the other end passes through the exhaust side valve body and is connected to a pusher; the pusher is sleeved with a pilot gas rubber pad, and the pilot gas rubber pad is arranged in a pilot gas pressure acting chamber between the main valve body and the exhaust side end cover; under the pressure action of the pilot gas, the pilot gas rubber pad is deformed to push the pusher to slide, thereby driving the valve core shaft and the valve core shaft sealing rubber pad to close the main valve internal exhaust port or close the main valve internal air inlet port.

[0011] Further, the pilot valves are arranged side by side on the exhaust side end cover, wherein one pilot valve corresponds to one sliding assembly, and the sliding assembly comprises a pilot gas rubber pad, a pusher, a valve core shaft and a valve core shaft sealing rubber pad.

[0012] Further, the main valve body is provided with one external air inlet port, two external air outlet ports and one external exhaust port.

[0013] Preferably, the pilot valve is a two-position three-way valve.

[0014] The utility model further provides an oxygen generator, the oxygen generator includes above-mentioned pilot formula four way valve.

[0015] Preferably, the oxygen generator is a normal pressure pressure swing adsorption oxygen generator or a negative pressure pressure swing adsorption oxygen generator.

[0016] The four-way valve pilot gas exhaust is discharged to the external gas path system through the four-way valve external exhaust port, so that the four-way valve has no pilot gas exhaust noise after being connected to the external gas path system.

[0017] The utility model discloses a simple structure form with two position three -way valve pilot valve exhaust and main valve exhaust all through four -way valve external exhaust port discharge, even if the pressure environment where main valve exhaust port is negative pressure environment or other pressure environment, the pressure environment when two position three -way pilot valve exhausts with the pressure environment where main valve exhaust is still consistent, the pressure of main valve internal pressure acting chamber and main valve exhaust chamber is consistent, and there is no pressure difference on both sides of pilot gas rubber mat, and pilot gas rubber mat and valve core shaft assembly can be reset normally, realize normal function of main valve, so can be applied in normal pressure swing adsorption oxygen generation system in the field of oxygen generator, also can be compatible and applied in negative pressure swing adsorption oxygen generation system.

[0018] The utility model discloses simple and compact overall structure, gas circuit height integration, realize low cost, eliminate two position three -way pilot valve exhaust noise. DRAWINGS

[0019] Figure 1 It is the explosion map of the four -way valve of the utility model;

[0020] Figure 2 It is the external structure schematic view of the four -way valve of the utility model;

[0021] Figure 3 It is the gas circuit principle diagram of the four -way valve of the utility model;

[0022] Figure 4 It is the cross section view of the four -way valve of the utility model;

[0023] Figure 5 It is the stereoscopic cross section view of the four -way valve of the utility model;

[0024] Figure 6 It is the cross section view of the four -way valve of the utility model;

[0025] Reference Signs:

[0026] 1, the gas side end cover;2, the gas side sealing ring;3, main valve body;4, valve core shaft spring;5, valve core shaft;6, valve core shaft sealing rubber mat;7, valve core shaft sealing ring;8, exhaust side valve body;9, exhaust side sealing ring;10, pusher;11, pilot gas rubber mat;12, exhaust side end cover;13, pilot valve;14, external gas inlet;15, external gas outlet;16, external exhaust port;17, main valve gas chamber;18, pilot gas inlet channel;19, pilot gas exhaust channel;20, pilot gas outlet channel;21, pilot valve gas inlet;22, pilot valve exhaust port;23, pilot valve gas outlet;24, pilot gas pressure acting chamber;25, main valve pilot gas exhaust port;26, main valve pilot gas exhaust chamber;27, main valve exhaust chamber;28, main valve internal exhaust port;29, main valve internal gas inlet;30, main valve gas chamber;31, valve core shaft spring seat. DETAILED DESCRIPTION

[0027] The technical solution of this utility model will be described in detail below with reference to the accompanying drawings and embodiments.

[0028] Example 1

[0029] like Figure 1 As shown, a pilot-operated four-way valve includes an inlet-side end cap 1, an inlet-side sealing ring 2, a main valve body 3, a valve spindle spring 4, a valve spindle 5, a valve spindle sealing gasket 6, a valve spindle sealing ring 7, an exhaust-side valve body 8, an exhaust-side sealing ring 9, a pusher 10, a pilot gas gasket 11, an exhaust-side end cap 12, and a pilot valve 13.

[0030] like Figures 2-6 As shown, the main valve body 3 contains a main valve body cavity, which is divided into a main valve inlet chamber 17, a main valve outlet chamber 30, a main valve exhaust chamber 27, a main valve pilot air exhaust chamber 26, and a pilot air pressure application chamber 24; wherein,

[0031] The main valve inlet chamber 17 is connected to the external inlet 14, and the main valve inlet chamber 17 is connected to the pilot valve inlet 22 through the pilot gas inlet channel 18; the main valve exhaust chamber 27 and the main valve pilot gas exhaust chamber 26 are two adjacent interconnected chambers. Figure 3 The same location is marked in the schematic diagram shown.

[0032] like Figures 4-6 As shown, an internal air inlet 29 of the main valve is provided between the main valve inlet chamber 17 and the main valve outlet chamber 30; and an internal exhaust port 28 of the main valve is provided between the main valve outlet chamber 30 and the main valve exhaust chamber 27.

[0033] The main valve outlet chamber 30 is connected to the external outlet 15;

[0034] like Figure 3 and 5 As shown, the main valve exhaust chamber 27 is connected to the pilot valve exhaust port 22 via the pilot gas exhaust channel 19 (at this time, the main valve exhaust chamber 27 is connected to the main valve pilot gas exhaust chamber 26, the pilot gas exhaust chamber 26 is connected to the main valve pilot gas exhaust port 25, and then connected to the pilot gas exhaust channel 19, and then connected to the pilot valve exhaust port 22); the pilot valve outlet 23 is connected to the pilot gas pressure action chamber 24 via the pilot gas outlet channel 20; the main valve exhaust chamber 27 is connected to the external exhaust port 16.

[0035] The main valve body 3 is provided with an intake side end cap 1 and an exhaust side end cap 12 on both sides, and the intake side end cap 1 and the main valve body 3 are sealed by an intake side sealing ring 2.

[0036] like Figure 6As shown, the valve core shaft 5 is sleeved with a valve core shaft sealing gasket 6; one end of the valve core shaft 5 passes through the main valve internal air inlet 29 and is elastically connected to the valve core shaft spring seat 31 arranged on the air inlet side end cover 1 through the valve core shaft spring 4, and the other end is connected to the pusher 10 through the exhaust side valve body 8, the pusher 10 is sleeved with a pilot gas sealing gasket 11, and the pilot gas sealing gasket 11 is arranged in the pilot gas pressure acting chamber 24 between the main valve body 3 and the exhaust side end cover 12; in the pilot gas pressure acting chamber 24, the pilot gas sealing gasket 11 can be deformed under the pressure action of the pilot gas to push the pusher 10 to slide, and then drive the valve core shaft 5 and the valve core shaft sealing gasket 6 on the valve core shaft 5 to close the main valve internal exhaust port 28 or close the main valve internal air inlet 29. The pilot gas sealing gasket 11, the pusher 10, the valve core shaft 5 and the valve core shaft sealing gasket 6 can slide under the push of the gas pressure and reset under the driving of the spring force of the valve core shaft spring 4. The valve core shaft sealing gasket 6 moves in the main valve exhaust chamber 30, and the opening and closing of the main valve internal exhaust port 28 and the main valve internal air inlet 29 on both sides of the main valve exhaust chamber 30 can be realized.

[0037] As shown in Figure 1 , Figure 4 , a valve core shaft sealing ring 7 is arranged between the exhaust side valve body 8 and the main valve body 3 to isolate the main valve exhaust chamber 30 and the main valve exhaust chamber 27, and an exhaust side sealing ring 9 is arranged between the exhaust side valve body 8 and the main valve body 3 to isolate the main valve exhaust chamber 27 and the pilot gas pressure acting chamber 24;

[0038] The pilot valve 13 is arranged side by side on the exhaust side end cover 12, wherein one pilot valve 13 corresponds to a set of pilot gas sealing gaskets 11, pushers 10, valve core shafts 5 and valve core shaft sealing gaskets 6; here, the pilot gas sealing gasket 11, the pusher 10, the valve core shaft 5 and the valve core shaft sealing gasket 6 are combined together and defined as a sliding assembly;

[0039] As shown in Figures 3-4 , the main valve air inlet chamber 17 communicates with the external air inlet 14, and the main valve exhaust chamber 27 communicates with the external exhaust outlet 16.

[0040] The utility model discloses a four-way valve compatible with application on negative pressure pressure swing adsorption oxygen generator, as shown in Figures 1-2 , the four-way valve contains an external air inlet 14, two external exhaust outlets 15 and an external exhaust outlet 16. The overall structure of the four-way valve is composed of a main valve body 3 and two two-position three-way pilot valves 13, and the main valve body is controlled to open and close by the two-position three-way pilot valve 13 under certain pressure conditions.

[0041] As shown in Figure 4 , the pilot gas inlet channel 18, the pilot gas exhaust channel 19 and the pilot gas outlet channel 20 are arranged in the interior of the main valve body 3, which communicates each air port as the internal channel of the main valve body. As shown in Figure 5As shown, the pilot valve inlet 21 is communicated with the pilot gas inlet passage 18 in the main valve body 3, the pilot valve outlet 22 is communicated with the pilot gas outlet passage 19 in the main valve body 3, and the pilot valve outlet 23 is communicated with the pilot gas outlet passage 20 in the main valve body 3. The communication of the other pilot valve 13 is the same as that of the above pilot valve.

[0042] The gas path control principle of the four-way valve is as shown in the figure Figures 3-4 , and specifically:

[0043] When the pilot valve inlet 21 of the control two-position three-way pilot valve 13 is communicated with the pilot valve outlet 23, part of the gas in the main valve inlet chamber 17 enters the pilot gas pressure acting chamber 24 through the pilot gas inlet passage 18 and the pilot gas outlet passage 20. Under certain pressure conditions, the pilot gas rubber pad 11 is deformed by the gas pressure to push the sliding assembly to overcome the spring force, so that the valve core shaft sealing rubber pad 6 blocks the main valve internal inlet 29. At this time, the valve core shaft sealing rubber pad 6 is away from the main valve internal outlet 28, and the gas can pass between the two. At this time, the passage between the external inlet 14 of the four-way valve and the external outlet 15 of the four-way valve is closed, and the external outlet 16 of the four-way valve is communicated with the external outlet 15 of the four-way valve.

[0044] When the pilot valve outlet 23 of the control two-position three-way pilot valve 13 is communicated with the pilot valve outlet 22, the pilot gas in the pilot gas pressure acting chamber 24 passes through the main valve pilot gas outlet passage 20 and the main valve pilot gas outlet passage 19 and is finally discharged to the main valve pilot gas outlet chamber 26 through the main valve pilot gas outlet 25. The main valve pilot gas outlet chamber 26 is communicated with the main valve outlet chamber 27 and the external outlet 16 of the four-way valve, and the pilot gas is discharged from the external outlet 16 of the four-way valve through this passage. At this time, the pilot gas rubber pad 11 loses the pressure action and resets, the sliding assembly resets under the action of the spring force, and the valve core shaft sealing rubber pad 6 blocks the main valve internal outlet 28. At this time, the main valve inlet chamber 17 is communicated with the main valve outlet chamber 30 through the main valve internal inlet 29, the external inlet 14 of the four-way valve is communicated with the external outlet 15 of the four-way valve, and the external outlet 16 of the four-way valve is closed with the external outlet 15 of the four-way valve.

[0045] In the process of the pilot gas exhaust of the four-way valve, the pilot gas is adjusted to be discharged through the external exhaust port 16 of the four-way valve by improving the valve body structure, all the gases of all parts of the four-way valve are connected into the external gas path system, the pressure environment of the pilot gas exhaust is kept consistent with the pressure environment of the main valve exhaust.

[0046] Since the pilot gas exhaust of the four-way valve is discharged to the external gas path system through the internal main valve body and the external exhaust port of the four-way valve, the four-way valve has no pilot gas exhaust noise.

[0047] The contents not described in detail in the utility model can adopt the conventional technical knowledge in the field.

[0048] Finally, it should be explained that the above examples are only used to illustrate the technical solutions of the utility model and not to limit it. Although the utility model is described in detail with reference to the examples, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and they should be covered in the scope of the claims of the utility model.

Claims

1. A pilot-operated four-way valve compatible with negative pressure swing adsorption oxygen generators, characterized in that, Includes an intake side end cap, an intake side sealing ring, a main valve body, a valve spindle spring, a valve spindle, a valve spindle sealing gasket, a valve spindle sealing ring, an exhaust side valve body, an exhaust side sealing ring, a pusher, a pilot gas gasket, an exhaust side end cap, and a pilot valve; The main valve body is divided into a main valve inlet chamber, a main valve outlet chamber, a main valve exhaust chamber, a main valve pilot gas exhaust chamber, and a pilot gas pressure action chamber; the main valve inlet chamber is connected to an external air inlet, and the main valve inlet chamber is connected to the pilot valve inlet through a pilot gas inlet channel; the main valve outlet chamber is connected to an external air outlet. An internal air inlet is provided between the main valve inlet chamber and the main valve outlet chamber; an internal air outlet is provided between the main valve outlet chamber and the main valve exhaust chamber. The main valve exhaust chamber is connected to the pilot valve exhaust port through a pilot gas exhaust channel; the pilot valve outlet is connected to the pilot gas pressure action chamber through a pilot gas outlet channel; the main valve exhaust chamber is connected to an external exhaust port. An intake end cap and an exhaust end cap are respectively provided on both sides of the main valve body. An intake end cap is sealed to the main valve body by an intake sealing ring. A valve core shaft sealing ring is provided between the exhaust valve body and the main valve body, and an exhaust sealing ring is provided between the exhaust valve body and the pilot gas gasket. A valve core sealing gasket is fitted on the valve core shaft. One end of the gasket passes through the main valve's internal air inlet via a valve core shaft spring and is elastically connected to the valve core shaft spring seat on the air inlet side end cover. The other end passes through the exhaust side valve body and is connected to the pusher. A pilot gas gasket is fitted on the pusher. The pilot gas gasket is located in the pilot gas pressure chamber between the main valve body and the exhaust side end cover. Under the pressure of the pilot gas, the pilot gas gasket deforms and pushes the pusher to slide, thereby causing the valve core shaft and the valve core shaft sealing gasket on it to close the main valve's internal exhaust port or close the main valve's internal air inlet.

2. The pilot-operated four-way valve according to claim 1, characterized in that, The pilot valves are arranged side by side on the exhaust side end cover, wherein one pilot valve corresponds to one sliding assembly, and the sliding assembly includes a pilot gas gasket, a pusher, a valve spindle, and a valve spindle sealing gasket.

3. The pilot-operated four-way valve according to claim 1, characterized in that, The main valve body is provided with one external air inlet, two external air outlets, and one external exhaust outlet.

4. The pilot-operated four-way valve according to claim 1, characterized in that, The pilot valve is a two-position three-way valve.

5. An oxygen generator, characterized in that, The oxygen generator includes the pilot-operated four-way valve as described in any one of claims 1-3.

6. The oxygen generator according to claim 5, characterized in that, The oxygen generator is either an atmospheric pressure swing adsorption (PSA) oxygen generator or a negative pressure swing adsorption (PSA) oxygen generator.

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