A diverging high-pressure hydrogen pressure reducing valve

Abstract

The application is a gradually expanding high-pressure hydrogen pressure reducing valve, comprising: a first valve body with an air inlet; a second valve body fixed on the top of the first valve body, with a pressure reducing cavity between the first valve body and the second valve body; an air outlet on the second valve body; a guide in the pressure reducing cavity; a valve core through the guide; a first elastic member with a spring seat between the bottom of the valve core; an adjusting mechanism on the top of the second valve body, suitable for adjusting the limit stroke of the valve core; a plurality of pressure reducing channels on the surface of the valve core; the pressure reducing channels comprise N pressure reducing grooves connected in a head-to-tail manner, the two connected pressure reducing grooves are arranged in an inclined manner, the first pressure reducing groove to the Nth pressure reducing groove, and the width and depth of the pressure reducing grooves gradually increase; the pressure reducing channels are used for reducing the pressure of hydrogen, and the pressure of high-pressure hydrogen can be reduced to the use range by using a one-stage pressure reducing structure, the structure is simple and compact, small in size, light in weight, and good in reliability.

Description

TECHNICAL FIELD

[0001] The application relates to a pressure reducing valve, in particular to a gradually expanding high-pressure hydrogen pressure reducing valve. BACKGROUND

[0002] Hydrogen energy is regarded as the most potential clean energy. Compared with traditional energy such as oil, natural gas and coal, hydrogen energy is a renewable green clean energy. With the rapid development of hydrogen energy industry, hydrogen energy is gradually scaled from preparation, storage, transportation and utilization. Because hydrogen is light in quality and small in molecular number, more hydrogen can be stored in a high-pressure state, so the storage and utilization of high-pressure hydrogen is the most optimal utilization mode at present. Hydrogen in a gas cylinder is in a high-pressure state, but the utilization of hydrogen is in a low-pressure state, so the pressure and flow of high-pressure hydrogen need to be accurately controlled within a certain range during the use of hydrogen.

[0003] The high-pressure hydrogen pressure reducing valve adopts an opening degree of a valve core in a valve body to adjust the flow of hydrogen, reduces the pressure of high-pressure hydrogen, and adjusts the opening degree of the valve core by means of the action of the pressure behind the valve, so that the pressure behind the valve is kept within a certain range. In the case that the inlet pressure is constantly changing, the outlet pressure is kept within the set range.

[0004] At present, it is difficult for the common hydrogen pressure reducing valve adopting a one-stage pressure reducing structure to reduce high-pressure hydrogen to 0.5-1 MPa, so the high-pressure hydrogen pressure reducing valve adopts a two-stage pressure reducing structure, but the two-stage pressure reducing structure is large in size and the outlet pressure is not stable enough.

[0005] Therefore, how to keep the hydrogen flow and outlet pressure by adopting a one-stage pressure reducing structure has become a problem to be solved by researchers in the field. SUMMARY

[0006] The technical problem to be solved by the application is how to keep the hydrogen flow and outlet pressure by adopting a one-stage pressure reducing structure.

[0007] To solve the above technical problem, the technical scheme adopted by the application is as follows:

[0008] The application discloses a gradually expanding high-pressure hydrogen pressure reducing valve, which comprises a first valve body, a second valve body, a gas outlet, a guide piece, a valve core, a first elastic piece and an adjusting mechanism.

[0009] In the application, the guide piece is fixedly arranged in the pressure reducing cavity, the valve core penetrates through the guide piece, the surface of the valve core is provided with a plurality of pressure reducing channels, gas enters from the gas inlet, passes through the gap between the spring seat and the inner wall of the first valve body, the guide piece and the pressure reducing channels of the valve core, and is discharged from the gas outlet; the pressure reducing channels are composed of a plurality of pressure reducing grooves, the two adjacent pressure reducing grooves are arranged in an inclined mode, the depth and width of the pressure reducing grooves gradually increase along the axial direction of the valve core, in other words, the width and depth of the first pressure reducing groove are the smallest, and then the width and depth of the pressure reducing grooves gradually increase, that is, the volume of each pressure reducing groove is larger and larger, and the hydrogen gas is reduced; the direction of the channel changes once every time a pressure reducing groove is added, the direction of the hydrogen gas flowing through the pressure reducing channels changes once, and the pressure reducing effect is achieved; the outer surface of the valve core can be uniformly provided with different numbers of pressure reducing channels, and the number of the pressure reducing channels is designed according to the set value of the pressure after the valve;

[0010] In addition, the end of the valve core is provided with a chamfer, so that when the bottom of the valve core is flush with the bottom of the spring seat, more gas can enter the gap between the inner wall of the spring seat and the valve core due to the chamfer, and then enter the first pressure reducing groove.

[0011] During the working process, the up-and-down movement of the valve core adjusts the exposed area of the pressure reducing channels relative to the spring seat, and the exposed area of the pressure reducing channels does not have the pressure reducing effect.

[0012] In order to illustrate the specific structure of the spring seat and the guide piece, the application adopts that the top of the spring seat is provided with an annular groove, and the bottom of the guide piece is provided with an annular piece which is inserted into the annular groove.

[0013] In the state without hydrogen gas, the maximum displacement of the valve core is adjusted through the adjusting structure, when high-pressure hydrogen gas is introduced into the pressure reducing valve, the high-pressure hydrogen gas firstly passes through the gap between the annular groove and the annular piece, and has a first pressure reducing effect, and then the hydrogen gas after the pressure reduction flows into the pressure reducing channels through the cooperation of the annular groove and the annular piece.

[0014] When the pressure behind the valve decreases, the elastic force of the first elastic member is less than the elastic force of the second elastic member in the adjusting mechanism, the second elastic member pushes the valve core to move downward, since the guide member remains stationary, the spring seat moves downward, the gap between the annular groove and the annular piece increases, at this time, the flow into the gap between the annular groove and the annular piece increases, the flow passage into the pressure reduction channel increases, and then the gas outlet is stabilized within the set value range; when the pressure behind the valve increases, the elastic force of the second elastic member is less than the elastic force of the first elastic member, at this time, the valve core moves upward, the second elastic member is compressed, the gap between the annular groove and the annular piece decreases, and the gas outlet is stabilized within the set value range.

[0015] In order to illustrate the specific structure of the adjusting mechanism, the adjusting mechanism comprises: an upper cover fixedly arranged with the second valve body, a spring cavity being arranged between the second valve body and the upper cover; a second elastic member arranged in the spring cavity, two ends of the second elastic member being fixedly arranged with an upper spring seat and a lower spring seat respectively; a top rod being arranged at the bottom of the lower spring seat and abutting against the top of the valve core; and an adjusting bolt being threadedly connected with the upper cover and abutting against the upper spring seat at the bottom.

[0016] By rotating the adjusting bolt, the elastic force of the second elastic member between the upper spring seat and the lower spring seat is adjusted, when the adjusting bolt is tightened, the elastic force of the second elastic member increases, and the gas with greater pressure needs to be introduced into the inlet in addition to the pressure of the first elastic member, so that the valve core moves upward.

[0017] In order to reduce the wear of the top of the upper spring seat, a groove for placing a steel ball is arranged at the center of the upper spring seat, and the adjusting bolt abuts against the upper spring seat through the steel ball.

[0018] The adjusting bolt does not directly contact the upper spring seat, because the adjusting bolt directly contacts the upper spring seat, the friction force is large, and the adjusting torque of the adjusting bolt is increased, a steel ball is arranged between the adjusting bolt and the upper spring seat, direct contact between the adjusting bolt and the upper spring seat is avoided, the adjusting torque of the adjusting bolt is greatly reduced, in other words, the steel ball is arranged between the adjusting bolt and the upper spring seat, the surface contact between the adjusting bolt and the upper spring seat becomes point contact between the adjusting bolt and the steel ball and between the steel ball and the upper spring seat, the friction force is effectively reduced, and the adjusting torque of the adjusting bolt is reduced.

[0019] The present application has the advantages that: the present application is a gradually expanding high-pressure hydrogen pressure reducing valve, the pressure of high-pressure hydrogen can be reduced to the use range by using the pressure reduction channel to reduce the pressure of hydrogen and adopting a one-stage pressure reduction structure, the structure is simple, compact, small in size, light in weight and good in reliability. BRIEF DESCRIPTION OF DRAWINGS

[0020] The present application will be further described below in combination with the drawings and examples.

[0021] Figure 1 is a sectional view of the present application;

[0022] Figure 2 is a structural schematic view of the valve core;

[0023] Figure 3 is a structural schematic view of the guide;

[0024] Figure 4 is a structural schematic view of the spring seat;

[0025] In the figure: 1-first valve body, 2-inlet, 3-second valve body, 4-pressure reduction cavity, 5-outlet, 6-guide, 7-valve core, 8-first elastic member, 9-spring seat, 10-pressure reduction channel, 11-pressure reduction groove, 12-annular groove, 13-annular piece, 14-upper cover, 15-second elastic member, 16-upper spring seat, 17-lower spring seat, 18-top rod, 19-adjusting bolt, 20-steel ball. DETAILED DESCRIPTION

[0026] The present application will now be described in further detail with reference to the drawings. These drawings are simplified schematic views and only show the basic structure of the present application in a schematic manner, and thus only show the components relevant to the present application.

[0027] As shown in Figures 1-2 the present application is a gradually expanding high-pressure hydrogen pressure reducing valve, comprising: a first valve body 1, which is provided with an inlet 2; a second valve body 3, which is fixed on the top of the first valve body 1, and which is provided with a pressure reduction cavity 4 between the first valve body 1; an outlet 5, which is provided on the second valve body 3, the inlet 2, the pressure reduction cavity 4, and the outlet 5 are communicated; a guide 6, which is provided in the pressure reduction cavity 4; a valve core 7, which passes through the guide 6; a first elastic member 8, which is provided in the pressure reduction cavity 4, and which is provided with a spring seat 9 between the bottom of the valve core 7; an adjusting mechanism, which is provided on the top of the second valve body 3, and which is adapted to adjust the limit stroke of the valve core 7; the surface of the valve core 7 is provided with a plurality of pressure reduction channels 10; the pressure reduction channel 10 comprises N pressure reduction grooves 11 connected in series, the two connected pressure reduction grooves 11 are arranged in an inclined manner, the first pressure reduction groove 11 to the Nth pressure reduction groove 11, the width and depth of the pressure reduction groove 11 gradually increase;

[0028] In the present scheme, the guide is fixedly arranged in the pressure reducing cavity, the valve core passes through the guide, a plurality of pressure reducing channels are arranged on the surface of the valve core, the gas enters from the gas inlet, passes through the gap between the spring seat and the inner wall of the first valve body, the guide and the pressure reducing channels of the valve core, and is discharged from the gas outlet; the pressure reducing channels are composed of a plurality of pressure reducing grooves, two adjacent pressure reducing grooves are arranged in an inclined manner, and the depth and width of the pressure reducing grooves gradually increase along the axial direction of the valve core; in other words, the width and depth of the first pressure reducing groove are the smallest, and then the width and depth of the pressure reducing groove gradually increase, that is, the volume of each pressure reducing groove is larger and larger, so that the hydrogen gas is reduced in pressure; with the increase of the pressure reducing groove, the direction of the channel changes once, the direction of the hydrogen gas flowing through the pressure reducing channel changes once, and the pressure reducing effect is achieved; the outer circular surface of the valve core can be uniformly provided with different numbers of pressure reducing channels, and the number of the pressure reducing channels is designed according to the set value of the pressure after the valve.

[0029] In addition, the end of the valve core is provided with a chamfer, so that when the bottom of the valve core is flush with the bottom of the spring seat, more gas can enter the gap between the inner wall of the spring seat and the valve core due to the chamfer; and then enters the first pressure reducing groove.

[0030] In the working process, the up-down movement of the valve core adjusts the exposed area of the pressure reducing channel relative to the spring seat, and the exposed area of the pressure reducing channel does not play a role in reducing pressure.

[0031] As shown in Figure 3 , 4 , in order to illustrate the specific structure of the spring seat and the guide, the spring seat 9 is provided with an annular groove 12 at the top; the bottom of the guide 6 is provided with an annular piece 13 which is inserted into the annular groove 12.

[0032] In the state without hydrogen gas, the maximum displacement of the valve core is adjusted by adjusting the structure, and when high-pressure hydrogen gas is introduced into the pressure reducing valve, the high-pressure hydrogen gas first passes through the gap between the annular groove and the annular piece to achieve a pressure reduction, and then the hydrogen gas after pressure reduction flows into the pressure reducing channel through the annular groove and the annular piece.

[0033] When the pressure after the valve decreases, the elastic force of the first elastic member is smaller than that of the second elastic member in the adjusting mechanism, the second elastic member pushes the valve core to move downward, and since the guide remains stationary, the spring seat moves downward, the gap between the annular groove and the annular piece increases, the flow rate entering the gap between the annular groove and the annular piece increases, the flow channel entering the pressure reducing channel increases, and then the gas outlet is stabilized within the set value range; when the pressure after the valve increases, the elastic force of the second elastic member is smaller than that of the first elastic member, at this time the valve core moves upward, the second elastic member is compressed, the gap between the annular groove and the annular piece decreases, and the gas outlet is stabilized within the set value range.

[0034] As shown in Figure 1As shown, to illustrate the specific structure of the adjustment mechanism, the present invention employs an adjustment mechanism comprising: an upper cover 14, which is fixedly disposed with the second valve body 3, and a spring cavity is provided between the upper cover 14 and the second valve body 3; a second elastic element 15, which is disposed within the spring cavity, and an upper spring seat 16 and a lower spring seat 17 are respectively fixedly disposed at its two ends; a push rod 18 is provided at the bottom of the lower spring seat 17 that abuts against the top of the valve core 7; and an adjustment bolt 19, which is threadedly connected to the upper cover 14, and whose bottom abuts against the upper spring seat 16.

[0035] By rotating the adjusting bolt, the elastic force of the second elastic element between the upper and lower spring seats is adjusted. When the adjusting bolt is tightened, the elastic force of the second elastic element increases. The inlet needs to be supplied with gas at a higher atmospheric pressure, plus the pressure of the first elastic element, in order to make the valve core move upward.

[0036] like Figure 1 As shown, in order to reduce wear on the top of the upper spring seat, the present invention provides a groove for placing the steel ball 20 at the center of the upper spring seat 16; the adjusting bolt 19 abuts against the upper spring seat 16 through the steel ball 20;

[0037] The adjusting bolt and the upper spring seat do not have direct contact. Direct contact between the adjusting bolt and the upper spring seat would result in high friction and increase the adjusting torque. Adding a steel ball between the adjusting bolt and the upper spring seat avoids direct contact, significantly reducing the adjusting torque. In other words, adding a steel ball between the adjusting bolt and the upper spring seat transforms the surface contact between them into point contact between the adjusting bolt and the steel ball, and between the steel ball and the upper spring seat, effectively reducing friction and thus the adjusting torque.

[0038] Based on the above-described preferred embodiments of the present invention, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A diverging high-pressure hydrogen pressure reducing valve characterized by, The utility model relates to a valve, which comprises: a first valve body with an air inlet; a second valve body fixed on the top of the first valve body, with a pressure reduction cavity between the first valve body and the second valve body; an air outlet on the second valve body, with the air inlet, the pressure reduction cavity and the air outlet being in communication; a guide piece in the pressure reduction cavity; a valve core passing through the guide piece; a first elastic piece in the pressure reduction cavity, with a spring seat between the first elastic piece and the bottom of the valve core; an adjusting mechanism on the top of the second valve body, adapted to adjust the limit stroke of the valve core, cooperating with the spring seat, and moving the valve core up and down; the surface of the valve core is provided with a plurality of pressure reduction channels; the pressure reduction channels comprise N pressure reduction grooves connected in series, with the two pressure reduction grooves connected in series being arranged obliquely, the width and depth of the pressure reduction grooves gradually increasing from the first pressure reduction groove to the Nth pressure reduction groove; the adjusting mechanism comprises: an upper cover fixed on the second valve body, with a spring cavity between the upper cover and the second valve body; a second elastic piece in the spring cavity, with an upper spring seat and a lower spring seat fixed on the two ends of the second elastic piece respectively; a top rod on the bottom of the lower spring seat, abutting against the top of the valve core; an adjusting bolt in threaded connection with the upper cover, with the bottom of the adjusting bolt abutting against the upper spring seat.

2. The gradually expanding high-pressure hydrogen pressure reducing valve according to claim 1, wherein an annular groove on the top of the spring seat; an annular piece protruding from the bottom of the guide piece, inserted into the annular groove.

3. The gradually expanding high-pressure hydrogen pressure reducing valve according to claim 1, wherein a groove for placing a steel ball at the center of the upper spring seat; the adjusting bolt abutting against the upper spring seat through the steel ball.

Images