Search

CN-121993742-A - Double-stage pressure reducer

CN121993742ACN 121993742 ACN121993742 ACN 121993742ACN-121993742-A

Abstract

The invention relates to the technical field of gas decompression, in particular to a two-stage pressure reducer, which comprises a valve body, wherein the valve body is formed by connecting a parent body and an aluminum upper cover in a threaded manner, and further comprises an air source connecting mechanism, a two-stage pressure reducing mechanism and a gas flow regulating mechanism, wherein the air source connecting mechanism is arranged at an air inlet on the parent body and is used for connecting an external air source and filtering incoming air, the two-stage pressure reducing mechanism is arranged in the air source connecting mechanism and the parent body and is used for carrying OUT two-stage pressure reduction on the incoming air, the flow meter air outlet mode is OUT, the two-stage pressure reducing mechanism is fixedly arranged at the end part of the parent body through an adapter and is used for displaying the flow of output air, the gas flow channel is arranged in the parent body and is used for introducing the two-stage pressure reduced air into a flow meter and prolonging the flow path of the gas in the parent body so that the gas exchanges heat with the parent body before flowing into the flow meter.

Inventors

  • LIN MUZI
  • ZHOU DIANGUANG

Assignees

  • 南京一达机器制造有限公司

Dates

Publication Date
20260508
Application Date
20260402

Claims (14)

  1. 1. The double-stage pressure reducer comprises a valve body, wherein the valve body is formed by connecting a parent body (1) and an aluminum upper cover (34) in a threaded manner, and the double-stage pressure reducer is characterized by further comprising: The air source connecting mechanism is arranged at an air inlet on the parent body (1) and is configured to be connected with an external air source and filter the entering air; The two-stage decompression mechanism is arranged in the air source connecting mechanism and the parent body (1) and is used for carrying out two-stage decompression on the entering air; A flow meter (14) fixedly mounted at the end of the parent body (1) through an adapter (13) and configured to display the flow rate of the output gas, the outlet of the flow meter (14) guiding the gas to an external device through an output assembly; A gas flow passage provided in the precursor body (1) and configured to introduce the gas subjected to two-stage depressurization into the flow meter (14) and lengthen a flow path of the gas within the precursor body (1) so that the gas exchanges heat with the precursor body (1) before flowing into the flow meter (14).
  2. 2. The dual stage pressure reducer of claim 1, wherein the gas source connection mechanism comprises: The high-pressure switching front body (56) is in threaded connection with an air inlet on the parent body (1), and an air inlet through hole is formed in the surface of the high-pressure switching front body (56); the first aluminum gasket (57) is arranged between the high-pressure switching front body (56) and the air inlet and is configured to seal the joint of the high-pressure switching front body and the air inlet; The high-pressure switching rear body (50) is in threaded connection with the high-pressure switching front body (56); The air inlet screw (2) is in threaded connection with the high-pressure switching rear body (50); the second aluminum gasket (6) is arranged between the air inlet screw (2) and the high-pressure switching rear body (50) and is configured to seal the joint of the air inlet screw (2) and the high-pressure switching rear body; The air inlet screw cap (5) is sleeved on the surface of the air inlet screw rod (2) and can rotate relative to the air inlet screw rod (2) and is configured to be in threaded connection with an external air source interface; The air inlet gasket (3) is arranged at the end part of the air inlet screw rod (2), and when the air inlet screw cap (5) is screwed with an external air source interface, the air inlet gasket (3) is compressed to realize sealing connection; And the filtering assembly is arranged inside the air inlet screw (2) and is configured to filter the air entering the pressure reducer.
  3. 3. The dual stage pressure reducer of claim 2, wherein the dual stage pressure reducing mechanism comprises: the first-stage decompression mechanism is arranged in the air source connecting mechanism and is configured to realize first-stage decompression on air entering from the air inlet; And a secondary decompression mechanism, which is arranged between the parent body (1) and the aluminum upper cover (34), and is configured to perform secondary decompression on the gas after primary decompression.
  4. 4. The dual stage pressure reducer of claim 3 wherein the primary pressure reducing mechanism comprises: The volcanic vent is formed in the high-pressure switching rear body (50) and is communicated with the high-pressure switching front body (56) through the air inlet screw (2); The valve core (55) is in a T-shaped cylinder shape and comprises an upper cylinder part and a lower cylinder part, the valve core is arranged in a containing cavity formed by the threaded connection of the high-pressure switching front body (56) and the high-pressure switching rear body (50), the end part of the lower cylinder part is provided with a sealing piece (52), and the end part of the lower cylinder part is inserted into a crater and is communicated with the inside of the air inlet screw (2); The four ventilation holes (5501) are formed in the surface of the lower cylindrical part in a circumferential array, are communicated with the air outlet holes in the cylindrical part above the valve core (55), and gas in the air inlet screw (2) enters the valve core (55) from the four ventilation holes (5501) and is discharged into the parent body (1) from the air outlet holes in the cylindrical part above; The sealing assembly is arranged on the surface of the valve core (55) and is used for assisting in sealing between the valve core (55) and the inner wall; The first high-pressure spring (51) is sleeved on the surface of the lower cylindrical part, one end of the first high-pressure spring (51) is abutted against the inner wall of the high-pressure switching rear body (50), and the other end of the first high-pressure spring is abutted against the lower end face of the upper cylindrical part.
  5. 5. The dual stage pressure reducer of claim 4, wherein the seal assembly comprises: the second O-shaped ring (54) is arranged on the surface of the upper cylindrical part and is used for sealing between the valve core (55) and the inner wall of the high-pressure switching front body (56); and a first O-ring (53) arranged on the surface of the lower cylindrical part and used for sealing fit between the lower cylindrical part and the inner wall of the crater when the lower cylindrical part is inserted into the crater.
  6. 6. The dual stage pressure reducer of claim 4, further comprising: and a pressure gauge (7) provided on the surface of the mother body (1) and configured to detect the gas pressure value after the pressure is reduced by the primary pressure reducing mechanism.
  7. 7. The dual stage pressure reducer of claim 3, wherein the secondary pressure reducing mechanism comprises: The first placing cavity (103) is formed at the bottom of the parent body (1), the first placing cavity (103) is communicated with a central channel of the parent body (1), and a cavity opening of the central channel is in threaded connection with a piston (15); a second high-pressure spring (49) placed inside the first placement chamber (103); A second placing cavity (3401) arranged in the aluminum upper cover (34); a low-pressure spring (37) placed inside the second placement chamber (3401) through a spring fulcrum shaft (36); A diaphragm assembly disposed between the low pressure spring (37) and the piston (15) and configured to push and decompress the piston (15); And the pressure regulating assembly is arranged at the end part of the aluminum upper cover (34) and is configured to regulate the output pressure of the output two-stage pressure reducing mechanism.
  8. 8. The dual stage pressure reducer of claim 7 wherein the membrane assembly comprises: a plunger (43) axially movably provided in the aluminum upper cover (34), the lower end of which abuts against the piston (15); the grinding disc (41) and the diaphragm (42) are sleeved at the upper end of the plunger (43), and the central area of the diaphragm (42) is attached to the grinding disc (41); A plunger anti-skid screw cap (39) which is in threaded connection with the upper end of the plunger (43) and clamps and fixes the grinding disc (41) and the membrane (42) on the plunger (43); the spring gasket (40) is arranged in the plunger anti-skid nut (39) and is used for providing anti-loosening pre-tightening force between the plunger anti-skid nut (39) and the end face of the plunger (43); and a diaphragm gasket (38) arranged at the edge of the diaphragm (42) and used for sealing the diaphragm (42) in the inner wall of the aluminum upper cover (34).
  9. 9. The dual stage pressure reducer of claim 7, wherein the pressure regulating assembly comprises: an adjusting screw (33) which is in threaded connection with the aluminum upper cover (34), and the end part of the adjusting screw (33) extends to the inside of the aluminum upper cover (34) to be propped against the spring support shaft (36) for changing the compression amount of the low-pressure spring (37) by selecting the adjusting screw (33); The fixing nut (32) is sleeved on the adjusting screw (33) and is in threaded connection with the adjusting screw (33), and when the fixing nut (32) is screwed down, the fixing nut is abutted against the surface of the aluminum upper cover (34) and used for locking the position of the adjusting screw (33).
  10. 10. The dual stage pressure reducer of claim 1, wherein the gas flow path comprises: the four air inlets (101) are formed in the bottom of the parent body (1) in a circumferential array and are communicated with the air outlets of the two-stage pressure reducing mechanism, and the axes of the air inlets (101) and the axis of the parent body (1) are arranged at an included angle; The collecting channel is arranged in the matrix (1) and is positioned at one half of the height direction of the matrix and communicated with the four air inlets (101); the exhaust hole is formed in the end portion of the parent body (1) and is respectively communicated with the collecting channel and the flowmeter (14).
  11. 11. The dual stage pressure reducer of claim 8, further comprising a safety shield assembly comprising: The safety valve (8) is in threaded connection on the surface of parent (1), safety hole (102) have been seted up to the bottom of parent (1), safety hole (102) and safety valve intercommunication, when doublestage decompression mechanism inefficacy, pressure in the pressure reducer exceeds the settlement threshold value, and safety valve (8) release pressure.
  12. 12. The dual stage pressure reducer of claim 11, wherein the safety shield assembly further comprises: The pressure relief hole is penetrated and arranged on the surface of the aluminum upper cover (34); And a round hole (4101) is formed in the grinding disc (41), when the gas pressure reaches a set value, the diaphragm (42) is broken down at the round hole (4101), and the gas is discharged through the round hole (4101) and the pressure relief hole in sequence.
  13. 13. The two-stage pressure reducer according to claim 1, wherein the parent body (1) and the aluminum upper cover (34) are forged by aviation aluminum bars, and annular fins are arranged on the surfaces of the parent body (1) and the aluminum upper cover (34) in an integrally formed mode at intervals respectively.
  14. 14. The two-stage pressure reducer according to claim 1, characterized in that the flowmeter (14) is made of impact-resistant material PC, provided with a safety relief valve.

Description

Double-stage pressure reducer Technical Field The invention relates to the technical field of gas decompression, in particular to a two-stage pressure reducer. Background In industrial production and scientific research, gas pressure reducers are indispensable devices capable of reducing the pressure of a high-pressure gas source to the required working pressure to ensure the safe operation of the devices and the accuracy of experiments. However, existing gas pressure reducers often suffer from gas icing problems when operated for long periods of time or when used in low temperature environments. This is because the gas expands during the depressurization, resulting in a sharp drop in temperature, and when the vapor in the gas reaches the saturation point, it condenses into ice, blocking the internal passages of the depressurizer, affecting the normal flow of the gas, and even causing equipment damage or safety accidents. Particularly, in some application scenes with strict requirements on gas purity and flow stability, such as chip manufacturing, precision welding, medical laboratories and the like, gas icing can not only influence production efficiency and product quality, but also can bring serious potential safety hazards. To solve this problem, the prior art generally uses an electric heating method to heat the pressure reducer to prevent the gas from freezing. However, this heating not only increases the energy consumption of the apparatus and increases the operating costs, but also may present additional safety risks for electrical heating in some clean rooms or flammable and explosive environments where special requirements for static protection are placed. In addition, the traditional pressure reducer is often not fully considered in structural design for heat loss of gas in the pressure reducing process, so that the heat exchange efficiency is low, and the risk of gas icing is further increased. In view of the above, there is a need in the art for improvements. Disclosure of Invention The invention aims to solve the defects in the prior art and provides a two-stage pressure reducer. In order to achieve the purpose, the double-stage pressure reducer adopts the technical scheme that the double-stage pressure reducer comprises a valve body, wherein the valve body is formed by connecting a parent body and an aluminum upper cover in a threaded manner, and the double-stage pressure reducer further comprises: The air source connecting mechanism is arranged at the air inlet on the parent body and is configured to be connected with an external air source and filter the entering air; the two-stage decompression mechanism is arranged in the air source connecting mechanism and the mother body and is used for carrying out two-stage decompression on the entering air; A flow meter fixedly mounted at the end of the parent body through an adapter and configured to display the flow rate of the output gas, the outlet of the flow meter guiding the gas to an external device through an output assembly; a gas flow passage provided in the precursor body and configured to introduce the two-stage depressurized gas into the flow meter and lengthen a flow path of the gas in the precursor body so that the gas exchanges heat with the precursor body before flowing into the flow meter. Preferably, the air source connecting mechanism comprises: the high-pressure switching front body is in threaded connection with an air inlet on a parent body, and an air inlet through hole is formed in the surface of the high-pressure switching front body; the first aluminum gasket is arranged between the high-pressure switching front body and the air inlet and is configured to seal the joint of the high-pressure switching front body and the air inlet; The high-pressure switching back body is in threaded connection with the high-pressure switching front body; the air inlet screw is in threaded connection with the high-pressure switching rear body; the second aluminum gasket is arranged between the air inlet screw and the high-pressure switching rear body and is configured to seal the joint of the air inlet screw and the high-pressure switching rear body; the air inlet screw cap is sleeved on the surface of the air inlet screw rod, can rotate relative to the air inlet screw rod and is configured to be in threaded connection with an external air source interface; the air inlet gasket is arranged at the end part of the air inlet screw rod, and is compressed to realize sealing connection when the air inlet screw cap is screwed with an external air source interface; and the filtering assembly is arranged inside the air inlet screw and is configured to filter the air entering the pressure reducer. Preferably, the dual stage pressure reducing mechanism includes: the first-stage decompression mechanism is arranged in the air source connecting mechanism and is configured to realize first-stage decompression on air entering from the air inlet; And the seco