Novel high-pressure decompression mechanism

Abstract

The utility model relates to a novel high-pressure decompression mechanism which comprises a butterfly-shaped piece, an ejector rod, a decompression valve, an O-shaped sealing ring, a reset spring, an upper shell, a lower shell, a pressure adjusting spring, an ejector block, a pressure sensing diaphragm and an upper cover. The pressure reducing valve with the through hole is matched with the upper shell and the lower shell, formed effective areas are equal, the influence of input pressure and output pressure on the pressure reducing valve is eliminated, and the output pressure precision of the pressure reducer is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of gas pressure reducing devices, and provides a novel high-pressure pressure reducing mechanism. Background Art

[0002] The structure of the current pressure reducer consists of a spring, a valve, a push rod, a hard core, a pressure regulating spring, a pressure sensing diaphragm, and a housing. High-pressure gas enters the B chamber from the pressure reducer inlet and enters the A chamber through the gap between the valve and the seat opening in the housing. If the low-pressure outlet is closed, the pressure in the A chamber increases, and the gas force on the pressure sensing diaphragm increases; under the combined force of the gas force on the pressure sensing diaphragm body, the spring force, and the gas force of the B chamber on the valve, overcoming the force of the pressure regulating spring, the push rod and the valve move upward to close the valve, and the gas in the B chamber no longer enters the A chamber. If there is a flow output at the low-pressure outlet of the pressure reducer, the pressure in the A chamber decreases, the gas force on the pressure sensing diaphragm decreases, and the pressure regulating spring overcomes the combined force of the gas force on the pressure sensing diaphragm, the spring force, and the gas force of the B chamber on the valve, causing the push rod to move downward to reopen the valve and allow the gas to flow from the B chamber into the A chamber, and maintaining a new balance at a fixed output flow rate. The disadvantages of the above pressure reducer structure are: due to the influence of the input pressure, the gas force of the B chamber on the valve changes with the input pressure, and the pressure regulating spring has a fixed force when the compression amount is constant. Therefore, the output pressure of the pressure reducer changes with the input pressure, that is, the higher the pressure at the input end of the B chamber of the pressure reducer, the lower the output pressure of its A chamber. The change range of the output pressure is affected by the pressure reducing mechanism and the pressure regulating mechanism, and the output pressure accuracy cannot be guaranteed. Content of the Utility Model

[0003] The purpose of the utility model is to solve the problem that the output pressure of the pressure reducer is affected by the input pressure and improve the pressure reducing output accuracy of the pressure reducer.

[0004] The technical solution of the utility model is as follows:

[0005] Provide a novel high-pressure pressure reducing mechanism, including a butterfly disc 12, a push rod 5, a pressure reducing valve 4, an O-ring 2, a return spring 3, an upper housing 6, a lower housing 1, a pressure regulating spring 11, a top block 9, a pressure sensing diaphragm 8, and an upper cover 10;

[0006] The upper housing is formed with a tee structure, which is divided into an upper channel, a side channel, and a lower channel; the upper housing is fixedly connected to the lower housing, the lower housing is provided with a high-pressure port, the pressure reducing valve is arranged in the lower housing, and the pressure reducing valve forms a valve port corresponding to the lower channel;

[0007] A push rod 5 is slidably arranged in the coaxial upper channel and lower channel, the upper end of the push rod abuts against the butterfly disc, the lower end of the push rod abuts against the pressure reducing valve 4, the pressure reducing valve is arranged between the high-pressure port and the valve port, the return spring provides reset for the pressure reducing valve, and the pressure reducing valve is a normally closed valve

[0008] The upper cover is connected to the upper housing, and the upper cover and the upper housing simultaneously press and seal the circumferential edge of the pressure-sensitive diaphragm 8. A spring chamber is formed between the upper cover and the pressure-sensitive diaphragm. The pressure-regulating spring 11 and the top block 9 are arranged in the spring chamber.

[0009] The upper housing and the pressure-sensitive diaphragm form a low-pressure chamber A, and the low-pressure chamber A is communicated with the upper channel; the butterfly piece 12 is arranged in the chamber A to provide an upward thrust to the pressure-sensitive diaphragm. The pressure-regulating spring leg top block provides a downward thrust, and the upward thrust and the downward thrust interact with each other; the butterfly piece contacts the lower surface of the pressure-sensitive diaphragm to provide an elastic force.

[0010] The upper housing is also provided with a pressure-sensing channel, and the pressure-sensing channel communicates the chamber A with the side channel, and the side channel corresponds to the low-pressure port.

[0011] Further, a guide sleeve 7 is also included. The guide sleeve 7 is arranged in the upper channel, and the ejector rod is in sealed sliding fit in the guide sleeve.

[0012] Further, the upper cover is a threaded cover, and the upper cover is threadedly connected to the upper housing.

[0013] Further, the lower housing is provided with a guide groove. The guide groove is coaxial with the upper channel and the lower channel, and the inner diameters of the lower channel and the guide groove are the same. The pressure-reducing valve 4 is arranged in the guide groove in a sliding and sealing manner. The pressure-reducing valve is provided with a through hole, and the hole communicates the guide groove, the lower channel, the side channel, the pressure-sensing channel and the low-pressure chamber A. Since the inner diameters of the lower channel and the guide groove are the same, the acting forces of the high-pressure port pressure on the pressure-reducing valve cancel each other out and do not generate an axial action on the pressure-reducing valve. The normal closing of the valve port is only through the action of the return spring.

[0014] Further, the guide sleeve 7 is fixed to the upper channel by interference fit.

[0015] Further, the low-pressure chamber is communicated with the atmospheric environment.

[0016] Further, an O-ring seal 2 is arranged between the pressure-reducing valve and the guide groove.

[0017] The advantages of the present utility model are as follows: The present utility model adopts a pressure-reducing valve with a through hole to cooperate with the upper housing and the lower housing, and the formed effective areas are equal, eliminating the influence of the input pressure and the output pressure on the pressure-reducing valve and improving the output pressure accuracy of the pressure reducer. Description of the Drawings

[0018] Figure 1 Schematic diagram of the high-pressure pressure-reducing mechanism of the present utility model;

[0019] Wherein: lower housing 1, O-ring seal 2, return spring 3, pressure reducing valve 4, ejector rod 5, upper housing 6, guide sleeve 7, pressure sensing diaphragm 8, top block 9, upper cover 10, pressure regulating spring 11, butterfly disc 12. Detailed implementation mode

[0020] The disclosed examples will be described more fully with reference to the accompanying drawings, in which some (but not all) of the disclosed examples are shown. In fact, many different examples can be described and these examples should not be construed as limited to the examples set forth herein. On the contrary, these examples are described so that this disclosure will be thorough and complete and will fully convey the scope of this disclosure to those skilled in the art.

[0021] A novel high-pressure pressure reducing mechanism is provided, including butterfly disc 12, ejector rod 5, pressure reducing valve 4, O-ring seal 2, return spring 3, upper housing 6, lower housing 1, pressure regulating spring 11, top block 9, pressure sensing diaphragm 8, upper cover 10;

[0022] The upper housing is formed with a tee structure, which is divided into an upper channel, a side channel and a lower channel; the upper housing is fixedly connected to the lower housing, the lower housing is provided with a high-pressure port, the pressure reducing valve is arranged in the lower housing, and the pressure reducing valve forms a valve port corresponding to the lower channel;

[0023] An ejector rod 5 is slidably arranged in the coaxially arranged upper channel and lower channel, the upper end of the ejector rod abuts against the butterfly disc, the lower end of the ejector rod abuts against the pressure reducing valve 4, the pressure reducing valve is arranged between the high-pressure port and the valve port, the return spring provides reset for the pressure reducing valve, and the pressure reducing valve is a normally closed valve

[0024] The upper cover is connected to the upper housing, and the upper cover and the upper housing simultaneously press and seal the circumferential edge of the pressure sensing diaphragm 8. A spring cavity is formed between the upper cover and the pressure sensing diaphragm, and the pressure regulating spring 11 and the top block 9 are arranged in the spring cavity.

[0025] The upper housing and the pressure sensing diaphragm form a low-pressure chamber A, and the low-pressure chamber A is communicated with the upper channel; the butterfly disc 12 is arranged in the chamber A and provides an upward thrust to the pressure sensing diaphragm, the pressure regulating spring presses the top block to provide a downward thrust, and the upward thrust and the downward thrust interact with each other; the butterfly disc contacts the lower surface of the pressure sensing diaphragm to provide an elastic force;

[0026] The upper housing is also provided with a pressure sensing channel, the pressure sensing channel communicates the chamber A with the side channel, and the side channel corresponds to a low-pressure port.

[0027] It further includes a guide sleeve 7, the guide sleeve 7 is arranged in the upper channel, and the ejector rod is in sealed sliding fit in the guide sleeve.

[0028] The upper cover is a threaded cover, and the upper cover is threadedly connected to the upper housing.

[0029] The lower housing is provided with a guide groove which is coaxial with the upper channel and the lower channel, and the inner diameter of the lower channel is the same as that of the guide groove. The pressure relief valve 4 is slidably and sealingly arranged in the guide groove. The pressure relief valve is provided with a through hole which enables the guide groove, the lower channel, the side channel, the pressure sensing channel and the low-pressure chamber A to communicate. Since the inner diameters of the lower channel and the guide groove are the same, the acting forces of the high-pressure port pressure on the pressure relief valve cancel each other out and do not produce an axial action on the pressure relief valve. The normal closing of the valve port is only effected by the return spring.

[0030] The guide sleeve 7 is fixed by interference fit with the upper channel.

[0031] The low-pressure chamber communicates with the atmospheric environment.

[0032] An O-ring seal 2 is arranged between the pressure relief valve and the guide groove.

[0033] Descriptions of different advantageous arrangements have been presented for purposes of illustration and description, but the description is not intended to be exclusive or limited to examples of the disclosed forms. Many modifications and variations will be apparent to those of ordinary skill in the art. Additionally, different advantageous examples may describe different advantages compared to other advantageous examples. The selected example or examples are chosen and described in order to best illustrate the principles of the examples, the practical application, and to enable those of ordinary skill in the art to understand the disclosure of various examples that have been modified for the particular use contemplated.

Claims

1. A new type of high pressure relief mechanism, characterized in that: It includes a butterfly plate, a push rod, a pressure reducing valve, a return spring, an upper shell, a lower shell, a pressure regulating spring, a push block, a pressure sensing diaphragm and an upper cover; The upper shell is formed with a three-way structure, which is divided into an upper channel, a side channel and a lower channel; the upper shell is fixedly connected to the lower shell, the lower shell is provided with a high-pressure port, the decompression valve is arranged in the lower shell, and the decompression valve forms a valve port corresponding to the lower channel; A push rod is slidably arranged in the coaxial upper channel and the lower channel, the upper end of the push rod is pressed against the butterfly plate, and the lower end of the push rod is pressed against the pressure relief valve, the pressure relief valve is arranged between the high pressure port and the valve port, the reset spring resets the pressure relief valve, and the pressure relief valve is a normally closed valve; The upper cover is connected to the upper shell, and the upper cover and the upper shell simultaneously press and seal the circumferential edge of the pressure-sensitive diaphragm. There is a spring cavity between the upper cover and the pressure-sensitive diaphragm, and the pressure-adjusting spring and the top block are arranged in the spring cavity. The upper shell and the pressure-sensitive diaphragm form a low-pressure chamber A, and the low-pressure chamber A is connected to the upper channel; the butterfly plate is arranged in the chamber A to provide an upward thrust to the pressure-sensitive diaphragm, and the pressure-adjusting spring leg top block provides a downward thrust, and the upward thrust and the downward thrust interact with each other; the butterfly plate contacts the lower surface of the pressure-sensitive diaphragm to provide an elastic force; The upper shell is also provided with a pressure-sensing channel, which connects the A cavity with a side channel, and the side channel corresponds to the low-pressure port.

2. A novel high pressure relief mechanism as claimed in claim 1, characterized in that: It also includes a guide sleeve, which is arranged in the upper channel, and the ejector rod is sealingly slidably fitted in the guide sleeve.

3. A novel high pressure relief mechanism as claimed in claim 1, characterized in that: The upper cover is a threaded cover, and the upper cover is threadedly connected to the upper shell.

4. A novel high pressure relief mechanism as claimed in claim 1, characterized in that: The lower shell is provided with a guide groove, which is coaxial with the upper channel and the lower channel, and the lower channel has the same inner diameter as the guide groove. The pressure reducing valve sliding seal is arranged in the guide groove, and the pressure reducing valve has a through hole, which connects the guide groove, the lower channel, the side channel, the pressure sensing channel and the low-pressure chamber A.

5. A novel high pressure relief mechanism as claimed in claim 1, characterized in that: The guide sleeve and the upper channel are fixed by interference fit.

6. A novel high pressure reducing mechanism as claimed in claim 1, characterized in that: The low pressure chamber is connected to the atmosphere.

7. A novel high pressure relief mechanism as claimed in claim 1, characterized in that: An O-shaped sealing ring is arranged between the pressure reducing valve and the guide groove.

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