CN211010035U

CN211010035U - Gas pressure regulating valve operating under negative pressure

Info

Publication number: CN211010035U
Application number: CN201921875444.4U
Authority: CN
Inventors: 叶旭轮; 叶晟; 石露
Original assignee: Taixing Sulin Machinery Co ltd
Current assignee: Taixing Sulin Machinery Co ltd
Priority date: 2019-11-01
Filing date: 2019-11-01
Publication date: 2020-07-14
Anticipated expiration: 2029-11-01

Abstract

The application provides a gas air-vent valve of negative pressure operation belongs to gas negative pressure operation protection valve technical field. The valve shell of the gas pressure regulating valve operating under negative pressure is hermetically connected with the diaphragm assembly to form a valve cavity, and the valve shell is provided with an inlet and an outlet communicated with the valve cavity. A lever is mounted to the valve chamber, a first end of the lever is configured to close or open the inlet, and a second end of the lever is connected to the diaphragm assembly. The first end of the resetting component acts on the second end of the lever so that the first end of the lever has a movement tendency of blocking the inlet; the second end of the reset assembly is threadably connected to the valve housing such that the force of the reset assembly on the lever is adjustable. This gas air-vent valve can adjust the effort that acts on the lever through reset assembly to can adjust the height that the import was opened, the pressure, flow and the velocity of flow of import department, strong adaptability, so that adjust different pressure parameters to different gas, satisfy gas engine's operating mode air feed demand.

Description

Gas pressure regulating valve operating under negative pressure

Technical Field

The application relates to the technical field of fuel gas negative pressure operation protection valves, in particular to a fuel gas pressure regulating valve operating under negative pressure.

Background

The fuel gas used by the existing engine can be various, and can be natural gas (methane, small amount of ethane, butane) or liquefied gas (propane C)₃H₈Propylene C₃H₆Butane C₄H₁₀Butene C₄H₈) And the like. Different combustion gases require different pressures for combustion. Therefore, before each gas is combusted, the pressure of each gas needs to be reduced and adjusted by a gas pressure reducing valve matched with the gas, and then the gas is combusted.

SUMMERY OF THE UTILITY MODEL

An object of this application is to provide a gas air-vent valve of negative pressure operation, can satisfy the pressure regulating demand of different gas, for example: different gas pressures, flows and flow rates.

In a first aspect, an embodiment of the present application provides a negative pressure operation gas pressure regulating valve, which includes a diaphragm assembly, a valve housing, a lever, and a reset assembly. The valve shell is connected with the diaphragm assembly in a sealing mode and forms a valve cavity, and the valve shell is provided with an inlet and an outlet which are communicated with the valve cavity. A lever is mounted to the valve chamber, a first end of the lever is configured to close or open the inlet, and a second end of the lever is connected to the diaphragm assembly. The first end of the resetting component acts on the second end of the lever so that the first end of the lever has a movement tendency of blocking the inlet; the second end of the reset assembly is threadably connected to the valve housing such that the force of the reset assembly on the lever is adjustable.

When gas is needed to be used, the reserved gas in the valve cavity is controlled to flow into a combustion chamber of the gas engine from the outlet, the gas engine is started to work, suction pressure is formed in the gas engine after the gas engine works, negative pressure in the valve cavity is increased, then the diaphragm assembly moves towards the second end of the pressure lever in the direction of the valve cavity, the second end of the pressure lever presses the reset assembly, then the first end of the lever moves towards the direction far away from the inlet, the inlet is opened, external gas enters the valve cavity, and the gas flows into the combustion chamber from the outlet after passing through the valve cavity. When the gas engine is stopped and gas is not needed to be used, the switch of the gas engine is turned off, the gas in the valve cavity cannot enter the combustion chamber, negative pressure in the valve cavity is reduced, the diaphragm assembly moves towards the direction far away from the valve cavity, the lever is reset under the action of the reset assembly, the first end of the lever moves towards the inlet direction and plugs the inlet, and external gas cannot enter the valve cavity. Because the second end of the reset assembly is in threaded connection with the valve shell, so that the acting force of the reset assembly on the lever can be adjusted, if the acting force of the reset assembly on the lever is increased, the reset assembly is adjusted by inward threads, and the diaphragm assembly needs larger force to press the lever downwards, the opening height of the other end of the lever (at the inlet of the valve shell) is reduced, and the flow velocity at the inlet are reduced; if the acting force of the reset component on the lever is adjusted to be small, the reset component is adjusted by the outward screw thread, the diaphragm component needs small force to press the lever downwards, the opening height of the other end of the lever (at the inlet of the valve shell) is adjusted to be large, and the flow speed at the inlet are increased. Thereby can satisfy different gas demands, according to gas regulated pressure, velocity of flow and the flow of difference, the adaptability of gas air-vent valve is stronger, can satisfy the supply demand of the operating mode of engine to different gas.

In a possible embodiment, the reset assembly comprises an elastic member and an adjusting member, the valve housing has a screw hole, the adjusting member is in threaded fit with the screw hole, one end of the elastic member abuts against the second end of the lever, and the other end of the elastic member abuts against the adjusting member.

The elastic deformation capacity of the elastic member is adjusted by rotating the adjusting member inward or outward, so as to adjust the acting force of the elastic member on the second end of the lever. The structure is simple and the adjustment is convenient.

In a possible implementation manner, the elastic member is a first spring, the adjusting member includes an adjusting head and a limiting portion connected with the adjusting head, the adjusting head is in threaded fit with the screw hole, the limiting portion extends into the first spring, and one end of the first spring, which is far away from the lever, abuts against the adjusting head.

Through the setting of spacing portion, when the first spring is adjusted to the rotation regulation head, can make first spring extend or compress in radial direction, avoid the stroke of first spring to take place the skew, make the cooperation of first spring and regulating part more accurate.

In a possible embodiment, a gap is formed between the limiting part and the hole wall of the screw hole, and one end of the first spring, which is close to the adjusting head, is located in the gap.

One end of the first spring close to the adjusting head is compressed or extended in the gap, so that the first spring is further limited to be extended or compressed in the radial direction, and the stroke of the first spring is prevented from being deviated.

In a possible embodiment, the threaded bore extends to the outer surface of the valve housing, the end face of the adjusting element facing the outer surface is recessed with a locking groove, and the portion of the threaded bore close to the outer surface is embedded with a plug.

Through the arrangement of the plug, a sealed space can be formed in the valve cavity, and air leakage can be prevented; on the other hand, the adjusting piece can be prevented from being adjusted when unnecessary, and potential safety hazards are avoided.

In a possible embodiment, the valve further comprises a valve cover, wherein the diaphragm assembly comprises a diaphragm and an adjusting rod, the valve cover is covered on the valve shell and connects the diaphragm to the valve shell in a sealing mode, one end of the adjusting rod extends towards the direction of the valve cover, the other end of the adjusting rod penetrates through the diaphragm and is located in the valve cavity and fixedly connected with the second end of the lever, and the diaphragm is limited on the adjusting rod.

Through the setting of adjusting the pole, can make diaphragm subassembly and lever connection together. When the diaphragm vibrates towards the valve cavity, the volume of the valve cavity is reduced, the adjusting rod moves towards the lever and presses the second end of the lever, so that the first end of the lever is lifted to open the inlet.

In one possible embodiment, the peripheral edge of the diaphragm is of an arcuate configuration recessed toward the valve chamber. The sensitivity adjustment degree of the diaphragm can be improved, and the adjustment stroke of the diaphragm is increased.

In a possible embodiment, the diaphragm assembly further includes a first clamping piece and a second clamping piece, the adjusting rod sequentially passes through the first clamping piece, the diaphragm and the second clamping piece, and the first clamping piece, the diaphragm and the second clamping piece are all limited on the adjusting rod.

Through the setting of first holding piece and second holding piece, can support the diaphragm, avoid diaphragm local deformation, make the regulation sensitivity of diaphragm higher.

In a possible embodiment, the first and second clamping pieces are each provided with a plurality of hole structures.

The hole structures are arranged on the first clamping piece and the second clamping piece, so that the weight of the first clamping piece and the weight of the second clamping piece can be adjusted, the amplitude strength of the diaphragm can be controlled, and the requirement of a gas pressure regulating valve can be met.

In a possible embodiment, the diameters of the first clamping piece and the second clamping piece are smaller than the diameter of the membrane piece, so that the arc-shaped structure is exposed between the first clamping piece and the second clamping piece.

The diaphragm can be supported, the vibration of the diaphragm at the arc-shaped structure can not be influenced, and the precision and the sensitivity of diaphragm adjustment are improved under the condition of ensuring the vibration stroke.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments are briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive efforts and also belong to the protection scope of the present application.

Fig. 1 is an assembly view of a gas pressure regulating valve provided in an embodiment of the present application;

fig. 2 is an exploded view of a gas pressure regulating valve provided in an embodiment of the present application;

FIG. 3 is a cross-sectional view of a gas pressure regulating valve provided in an embodiment of the present application;

FIG. 4 is a schematic diagram of a first structure of a gas pressure regulating valve provided in an embodiment of the present application;

FIG. 5 is an enlarged view taken at VI in FIG. 3;

fig. 6 is a second structural schematic diagram of the gas pressure regulating valve provided in the embodiment of the present application;

fig. 7 is a schematic view illustrating an assembly structure of a membrane and a first clamping piece according to an embodiment of the present application.

Icon: 10-a gas pressure regulating valve; 110-a valve housing; 120-valve cover; 130-a diaphragm assembly; 140-a lever; 150-a reset component; 131-a membrane; 111-an inlet; 112-an outlet; 160-a valve cavity; 132-an adjustment lever; 151-an elastic member; 152-an adjustment member; 1521-adjusting the head; 1522-a limiting part; 141-a projection; 142-a raised sheet; 153-plug; 113-a first protrusion; 143-connecting member; 144-a glue cover; 145-a stop; 114-a second protrusion; 115-third projection; 146-a rotating shaft; 133-a clamp spring; 1321-an annular groove; 134-pressing head; 135-split washer; 136-a second spring; 137-a first holding piece; 138-a second gripping tab; 1311-arc-shaped structure; 116-raised columns; 117-gas inlet joint; 118-gas outlet joint; 119-fourth projection.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.

The gas pressure is adjusted by using a gas pressure adjusting valve operated under negative pressure, and the following pressure balance relationship is satisfied: p₁F+P₂F＝△P₃F. Wherein, P₁F: suction to the fuel when the engine is working; p₂F gas supply pressure △ P₃F: the pressure adjusted by the gas pressure regulating valve. However, for different kinds of gas, P thereof₁F and P₂The value of F is changed so that △ P is changed₃The value of F will also vary. In the prior art, no gas pressure regulating valve capable of meeting different gas is available.

Fig. 1 is an assembly view of a gas pressure regulating valve 10 according to an embodiment of the present application; fig. 2 is an exploded view of a gas pressure regulating valve 10 according to an embodiment of the present application; fig. 3 is a cross-sectional view of the gas pressure regulating valve 10 according to the embodiment of the present application. Referring to fig. 1 to 3, in the embodiment of the present application, the gas pressure regulating valve 10 operating under negative pressure includes a valve housing 110, a valve cover 120, a diaphragm assembly 130, a lever 140 and a reset assembly 150. The valve cover 120 is covered on the valve housing 110, and the valve housing 110 is provided with an inlet 111 and an outlet 112. For convenience of description of the gas pressure regulating valve 10, the directions "up" and "down" are described herein as the directions shown in the drawings.

The diaphragm assembly 130 includes a diaphragm 131, and the bonnet 120 covers the valve housing 110 and sealingly couples the diaphragm 131 to the valve housing 110, such that the valve housing 110 and the diaphragm 131 are sealingly coupled to form a valve chamber 160. Alternatively, the upper end of the valve housing 110 is an opening structure, the diaphragm 131 is disposed on the valve housing 110 to close the opening, the peripheral edge of the diaphragm 131 is disposed on the wall of the opening of the valve housing 110, and the wall of the opening is provided with a threaded hole. Correspondingly, the periphery of the valve cover 120 is also provided with threaded holes, when the valve cover 120 is covered on the valve housing 110, the periphery edge of the diaphragm 131 is positioned between the valve cover 120 and the valve housing 110, the valve cover 120, the diaphragm 131 and the valve housing 110 are fixed together by screws, a valve cavity 160 is formed between the diaphragm 131 and the valve housing 110, and the inlet 111 and the outlet 112 on the valve housing 110 are both communicated with the valve cavity 160.

The lever 140 is installed in the valve chamber 160, a first end of the lever 140 is configured to close or open the inlet 111, a second end of the lever 140 is connected to the diaphragm assembly 130, and a first end of the reset assembly 150 acts on the second end of the lever 140, so that the first end of the lever 140 has a movement tendency to close the inlet 111. The diaphragm assembly 130 further includes an adjustment rod 132, one end of the adjustment rod 132 extends toward the valve cover 120, and the other end passes through the diaphragm 131 and is located in the valve chamber 160 and connected to the second end of the lever 140, and the diaphragm 131 is defined on the adjustment rod 132.

The valve cover 120, the diaphragm 131 and the valve cavity 160 are sequentially arranged from top to bottom, the valve cover 120 is arranged above the diaphragm 131, and the valve cavity 160 is arranged below the diaphragm 131. When the gas is needed, the gas reserved in the valve cavity 160 is controlled to flow into a combustion chamber of the gas engine from the outlet 112, the gas engine is started to work, suction pressure is formed in the gas engine after the gas engine works, negative pressure in the valve cavity 160 is increased, the difference value between the external pressure and the pressure in the valve cavity 160 is increased, and the diaphragm 131 is sunken downwards. Since the diaphragm 131 is defined on the adjusting rod 132, the end of the adjusting rod 132 away from the valve cover 120 moves downward to press the second end of the pressure lever 140 to press the return assembly 150, so that the first end of the lever 140 moves upward to open the inlet 111, and the external combustion gas enters the valve cavity 160, passes through the valve cavity 160, and then flows into the combustion chamber from the outlet 112. When the gas engine stops and does not need to use gas, the switch of the gas engine is closed, the gas in the valve cavity 160 cannot enter the combustion chamber, the negative pressure in the valve cavity 160 is reduced, the difference value between the outside pressure and the pressure in the valve cavity 160 is reduced, and the diaphragm 131 is upwards recessed. Since the diaphragm 131 is defined on the adjustment rod 132, one end of the adjustment rod 132 away from the valve cover 120 moves upward and pulls the second end of the lever 140, and since the lever 140 is reset by the reset assembly 150, the second end of the lever 140 can move upward, and the first end of the lever 140 moves downward and blocks the inlet 111, so that external gas cannot enter the valve chamber 160.

The pressure parameters (pressure, flow and flow rate) of different fuel gases are different, and the adaptability of the fuel gas pressure regulating valve 10 is improved in order to meet the regulation requirements of the pressure parameters of different fuel gases. In the present embodiment, the second end of the reset assembly 150 is threadably coupled to the valve housing 110 to enable adjustment of the force applied by the reset assembly 150 to the lever 140.

If the acting force of the reset assembly 150 on the lever 140 is adjusted to be larger, the reset assembly 150 is adjusted by inward threads, a larger force is required for the adjusting rod 132 to press the lever 140, the downward displacement of the adjusting rod 132 is increased, the opening height of the other end of the lever 140 (at the inlet 111 of the valve housing 110) is adjusted to be smaller, and the flow velocity at the inlet 111 are reduced; if the force applied to the lever 140 by the reset assembly 150 is reduced, the reset assembly 150 is adjusted by screwing outwards, and a small force is required for the diaphragm assembly 130 to press down the lever 140, so that the downward displacement of the adjusting rod 132 is reduced, the opening height of the other end of the lever 140 (at the inlet 111 of the valve housing 110) is increased, and the flow rate and the flow velocity at the inlet 111 are increased. Thereby can satisfy different gas demands, according to gas regulated pressure, velocity of flow and the flow of difference, the adaptability of gas air-vent valve is stronger, can satisfy the supply demand of the operating mode of engine to different gas.

Optionally, the reset assembly 150 comprises an elastic member 151 and an adjusting member 152, the valve housing 110 has a screw hole, the axis of the screw hole substantially vertically penetrates through the bottom plate of the valve housing 110, the adjusting member 152 is in threaded fit with the screw hole, one end of the elastic member 151 abuts against the second end of the lever 140, and the other end abuts against the adjusting member 152. The elastic deformation capability of the elastic member 151 is adjusted by rotating the adjusting member 152 inward or outward, so that the force of the elastic member 151 against the second end of the lever 140 is adjusted. The structure is simple and the adjustment is convenient.

Further, fig. 4 is a schematic diagram of a first structure of the gas pressure regulating valve 10 according to the embodiment of the present application. Referring to fig. 1-4, the elastic element 151 is a first spring, the adjusting element 152 includes an adjusting head 1521 and a limiting portion 1522 connected to the adjusting head 1521, the adjusting head 1521 is in threaded engagement with the screw hole, the limiting portion 1522 extends into the first spring, and an end of the first spring away from the lever 140 abuts against the adjusting head 1521.

The adjusting head 1521 is provided with a slot or a notch for installing a screwdriver, and the screwdriver is clamped in the slot or the notch, and then the screwdriver is rotated, so that the adjusting head 1521 can be screwed in or out. Through the setting of spacing portion 1522, when rotatory regulation head 1521 adjusted first spring, can make first spring extend or compress in radial direction, avoid the stroke of first spring to take place the skew, make the cooperation of first spring and regulating part 152 more accurate.

Optionally, the position-limiting portion 1522 is a column-shaped structure, the end of the second end of the lever 140 is provided with a protruding portion 141, the protruding portion 141 is a column-shaped structure, the protruding portion 141 protrudes toward the lower side of the lever 140 (the protruding portion 141 faces the direction of the adjusting member 152), one end of the first spring is clamped at the second end of the lever 140, the protruding portion 141 extends into the first spring, and the position-limiting portion 1522 also extends into the first spring. Since the protrusion 141 and the extension are both of a column type structure and the outer diameters of the protrusion 141 and the extension are smaller than the inner diameter of the first spring, the protrusion 141 and the extension are disposed inside the first spring. Alternatively, the outer diameters of the protrusion 141 and the extension are equal to the inner diameter of the first spring, and the first spring can be further prevented from being deflected during compression or extension, and the adjustment of the first spring can be made more precise.

Further, a gap is formed between the limiting portion 1522 and the hole wall of the screw hole, and one end of the first spring, which is close to the adjusting head 1521, is located in the gap. The end of the second end of the lever 140 is provided with a protruding piece 142, the protruding piece 142 protrudes toward the lower side of the lever 140 (the protruding piece 142 faces the direction of the adjusting piece 152), a gap is formed between the protruding piece 142 and the protruding part 141, and the end of the first spring close to the lever 140 is also located in the gap. The first spring is further limited to extend or compress in the radial direction, and the stroke of the first spring is prevented from being deviated.

Further, two ends of the first spring may also be embedded in the second end of the lever 140 and the adjusting head 1521, respectively, so as to prevent the first spring from being separated from the lever 140 and the adjusting member 152.

In the embodiment, the screw hole extends to the outer surface of the valve housing 110, the end surface of the adjusting member 152 facing the outer surface is recessed with a slot, and the portion of the screw hole near the outer surface is embedded with a plug 153. Due to the arrangement of the plug 153, a sealing structure can be formed in the valve cavity 160, so that air leakage can be prevented; on the other hand, the adjusting part 152 can be prevented from being adjusted when unnecessary, and potential safety hazards are avoided.

Optionally, the plug 153 is a column structure, the plug 153 is a deformable component, the plug 153 may be interference-fitted at the outer end of the screw hole, and the plug 153 may be a rubber plug 153. By the arrangement of the plug 153, a sealed space can be formed in the valve cavity 160, so that air leakage can be prevented; on the other hand, the adjusting part 152 can be prevented from being adjusted when unnecessary, and potential safety hazards are avoided.

In order to make the screw hole achieve the above-mentioned matching effect, optionally, a first protrusion 113 is provided at the bottom of the valve housing 110 (the surface far from the valve cover 120), the first protrusion 113 protrudes out of the bottom surface of the valve housing 110, and the protruding part of the first protrusion 113 is located in the valve chamber 160. A screw hole penetrating the valve housing 110 is provided on the first protrusion 113, and the screw hole may have a sufficient length so as to precisely adjust the elastic coefficient of the first spring.

Fig. 5 is an enlarged view taken at vi of fig. 3 in order to perform the installation of the first end of the lever 140. Referring to fig. 3 and fig. 5, optionally, the lever 140 includes a rod body, a connecting member 143, and a rubber cover 144, the second end of the lever 140 has a structure identical to that of the end of the rod body away from the rubber cover 144, and the connection relationship between the end of the rod body away from the rubber cover 144 and the reset assembly 150 and the adjusting rod 132 is identical to that between the second end of the lever 140 and the reset assembly 150 and the adjusting rod 132, which is not repeated herein.

The connecting piece 143 is arranged on one end of the rod body far away from the resetting component 150, one end of the connecting piece 143 penetrates through one end of the rod body far away from the resetting component 150, the other end of the rod body is connected with the rubber cover 144, and the rubber cover 144 is used for sealing the inlet 111.

Alternatively, the aperture of the inlet 111 at the end near the valve chamber 160 is gradually increased, and the rubber cover 144 can deformably seal the inlet 111. Because the rubber cover 144 is a deformed structure and the deformation is a gradual change process, the aperture of the inlet 111 is gradually increased from the inside (the end far away from the valve cavity 160) to the outside (the end close to the valve cavity 160), so that the rubber cover 144 can be gradually deformed and partially embedded into the inlet 111, and the sealing and blocking effect of the rubber cover 144 on the inlet 111 is better.

Further, the end of the connecting element 143 away from the rubber cover 144 is provided with a limiting element 145, the limiting element 145 is located above the first end of the lever 140, the first end of the lever 140 is located between the limiting element 145 and the rubber cover 144, and the limiting element 145 is limited to prevent the first end of the lever 140 from separating from the connecting element 143.

The glue cover 144 moves up and down due to the lever 140, so that the glue cover 144 blocks the inlet 111. Fig. 6 is a second structural schematic diagram of the gas pressure regulating valve 10 according to the embodiment of the present application. Referring to fig. 2-6, optionally, a second protrusion 114 is disposed at the bottom of the valve housing 110, the second protrusion 114 protrudes from the bottom surface of the valve housing 110, the protruding portion of the second protrusion 114 is located in the valve cavity 160, an inlet 111 is disposed on the second protrusion 114, and an axis of the inlet 111 is vertically disposed, so that the rubber cover 144 is pressed downward to seal and block the inlet 111, thereby preventing air leakage.

The balance condition of the lever 140 is that two moments (the product of force and moment arm) acting on the lever 140 are equal in magnitude, namely, a power × power arm is represented by a resistance × resistance arm and an algebraic expression is represented by F1 ×L 1 to F2 ×L 2, wherein F1 represents power, L1 represents power arm, F2 represents resistance, and L2 represents resistance arm, obviously, the acting force of the first spring is small, the acting force required for sealing and blocking the inlet 111 is large, and the rotating shaft 146 of the lever 140 is arranged on the side close to the inlet 111 for balancing the lever 140.

Optionally, two third protrusions 115 are respectively disposed on two sides of the second protrusion 114, the third protrusions 115 protrude from the bottom surface of the valve housing 110, the protruding portions of the third protrusions 115 are located in the valve cavity 160, two ends of the rotating shaft 146 are respectively fixed on the two third protrusions 115, the rotating shaft 146 penetrates through the lever 140, and the extending direction of the lever 140 is perpendicular to the extending direction of the rotating shaft 146, so that the lever 140 and the rotating shaft 146 can be installed in a matched manner.

Having described the connection of the lever 140, the diaphragm 131 is further described below:

in order to limit the diaphragm 131 on the adjusting rod 132, a clamp spring 133 is sleeved outside the adjusting rod 132, and the diaphragm 131 is fixed on the clamp spring 133. Optionally, a circlip 133 on the adjustment lever 132 is mounted between the ends of the adjustment lever 132. Further, the installation position of the clamp spring 133 can make the diaphragm 131 in a planar state when the gas pressure regulating valve 10 is not in use.

Optionally, an annular groove 1321 is formed in the circumferential direction of the adjusting rod 132, the membrane 131 is arranged in the annular groove 1321, the clamp spring 133 is sleeved in the annular groove 1321 to fix the membrane 131 in the annular groove 1321, the membrane 131 is installed, and the membrane 131 is prevented from sliding on the adjusting rod 132 when the adjusting rod 132 moves up and down.

When the combustion chamber is opened, in order to enable gas in the valve cavity 160 to smoothly enter the combustion chamber, the end part, far away from the valve cavity 160, of the adjusting rod 132 is provided with the pressing head 134, an opening retainer ring 135 is sleeved above the clamp spring 133 (the adjusting rod 132 between the adjusting head 1521 and the clamp spring 133 is sleeved with the opening retainer ring 135, or the adjusting rod 132 between the annular groove 1321 and the clamp spring 133 is sleeved with the opening retainer ring 135), the adjusting rod 132 between the pressing head 134 and the opening retainer ring 135 is sleeved with the second spring 136, the valve cover 120 is provided with a through hole, the adjusting rod 132 penetrates through the through hole to enable the pressing head 134 to be located outside the valve cover 120, and when external force is applied to the pressing head 134, the pressing head 134 can penetrate through.

When the combustion chamber is just opened or the suction force of the engine is insufficient, the pressure head 134 is pressed downwards, the diaphragm 131 is manually controlled to move downwards, and the gas in the valve cavity 160 can be squeezed into the combustion chamber, so that the gas can be smoothly used. The pressing head 134 is then released and the pressing head 134 can be reset by the second spring 136.

In order to fixedly connect one end of the adjusting rod 132, which is far away from the valve cover 120, to the second end of the lever 140, optionally, a strip-shaped hole is provided at the second end of the lever 140, the end of the adjusting rod 132, which is far away from the valve cover 120, is inserted into the strip-shaped hole, and the adjusting rod 132 is fixed in the strip-shaped hole, so as to form a fixed connection between the adjusting rod 132 and the second end of the lever 140, and when the adjusting rod 132 moves up and down, the second end of the lever 140 can move up and down. Wherein the strip-shaped hole is provided to adjust the weight of the lever 140.

Of course, in the embodiment of the present application, in addition to the above-mentioned manner, the adjusting rod 132 and the second end of the lever 140 may be fixed together by a fixing member such as a screw, or the adjusting rod 132 and the second end of the lever 140 may be welded together, or a circular hole may be provided so that the adjusting rod 132 is inserted into the second end of the lever 140 and the adjusting rod 132 are connected together. The embodiment of the present application is not limited, and the manner of fixing the end of the adjusting rod 132 far from the adjusting head 1521 to the second end of the lever 140 is within the protection scope of the present application.

In order to increase the adjustment accuracy of the gas pressure regulating valve 10, optionally, the adjusting rod 132 passes through the middle of the diaphragm 131, the through hole of the valve cover 120 is disposed at the center of the valve cover 120, and when a downward force is applied to the pressing head 134, the adjusting rod 132 moves downward, the diaphragm 131 fixedly connected with the adjusting rod 132 is deformed in a concave manner, and the deformation of the diaphragm 131 is more uniform.

In the embodiment of the present application, the membrane 131 is made of industrial silk cloth, and the industrial silk cloth refers to a membrane with air tightness formed by coating adhesive on two surfaces of a metal mesh, so that the membrane 131 has a relatively thin thickness, and the membrane 131 has a relatively good deformation capability and is relatively sensitive. Since the membrane 131 is easily deformed, the deformation unevenness of the membrane 131 is avoided. Fig. 7 is a schematic view illustrating an assembly structure of the diaphragm 131 and the first clamping piece 137 according to an embodiment of the present disclosure. Referring to fig. 2 and 7, optionally, the diaphragm assembly 130 further includes a first clamping piece 137 and a second clamping piece 138, the adjusting rod 132 sequentially passes through the first clamping piece 137, the diaphragm 131 and the second clamping piece 138, and the first clamping piece 137, the diaphragm 131 and the second clamping piece 138 are all limited on the adjusting rod 132.

Through the arrangement of the first clamping piece 137 and the second clamping piece 138, the membrane 131 can be supported, so that the local deformation of the membrane 131 is avoided, and the adjustment sensitivity of the membrane 131 is higher. Alternatively, the first clamping piece 137 and the second clamping piece 138 are fixed on the clamp spring 133, so that the adjusting rod 132 fixedly connected with the diaphragm 131 moves up or down synchronously during the deformation of the diaphragm 131.

Further, the first clamping piece 137, the diaphragm 131 and the second clamping piece 138 are all located in the annular groove 1321 and fixed in the annular groove 1321 through the snap spring 133, and the first clamping piece 137, the diaphragm 131 and the second clamping piece 138 are installed, so that when the adjusting rod 132 moves up and down, the diaphragm 131 vibrates up and down, or when the diaphragm 131 vibrates up and down, the adjusting rod 132 moves up and down.

Optionally, to increase the tuning range and tuning sensitivity of the diaphragm 131, the peripheral edge of the diaphragm 131 is an arcuate structure 1311 that is concave toward the valve chamber 160. The adjustment sensitivity of the diaphragm 131 can be improved, and the adjustment stroke of the diaphragm 131 can be increased.

Further, the diameters of the first clamping piece 137 and the second clamping piece 138 are smaller than the diameter of the membrane 131, so that the arc-shaped structure 1311 is exposed between the first clamping piece 137 and the second clamping piece 138. The diaphragm 131 can be supported without affecting the vibration of the diaphragm 131 at the arc structure 1311, and the adjustment accuracy and sensitivity of the diaphragm 131 can be improved under the condition of ensuring the vibration stroke.

When the engine needs to be started, the force is directly applied to the pressing head 134, so that the adjusting rod 132 and the membrane 131 connected with the adjusting rod 132 move downwards, and the arc-shaped structure 1311 of the membrane 131 cannot influence the gas flow in the valve cavity 160 to the combustion chamber due to the large moving distance of the pressing head 134; when the diaphragm 131 is recessed upwards, since the arc structure 1311 is more easily deformed, the arc structure 1311 is recessed upwards, and then the middle portion of the diaphragm 131 is recessed upwards, so that the adjusting rod 132 is driven to move upwards, and the adjusting rod is matched with the reset component 150 to reset the second end of the lever 140, thereby increasing the adjusting stroke of the diaphragm 131 and improving the adjusting precision of the diaphragm 131.

Further, the first clamping piece 137 and the second clamping piece 138 are epoxy resin pieces, which have light weight but certain weight function, and do not affect the deformation of the diaphragm 131, so that the amplitude of the diaphragm 131 can be uniform, and the adjustment accuracy of the diaphragm 131 is higher.

Alternatively, the first and

second clamping pieces

137 and 138 are provided with a plurality of hole structures, respectively. The weight of the first clamping piece 137 and the second clamping piece 138 can be adjusted so that the amplitude strength of the diaphragm 131 can be controlled to suit the requirements of the gas pressure regulating valve 10. Compared with the membrane 131, the pore structure has a smaller pore diameter, and the sensitivity of the membrane 131 is not affected.

To control the amplitude of the diaphragm 131, valve sensitivity is ensured. In the embodiment of the present application, a plurality of protruding columns 116 are disposed at the bottom of the valve housing 110, the protruding columns 116 are vertically disposed and protrude out of the bottom surface of the valve housing 110, and the protruding portions of the protruding columns 116 are located in the valve cavity 160. The protruding column 116 is disposed on the bottom surface of the valve housing 110 on the side away from the lever 140, and when the diaphragm 131 vibrates, since the lever 140 and the component connected to the lever 140 are disposed on one side in the valve cavity 160 and the protruding column 116 is disposed on the other side, the amplitudes of the diaphragm 131 can be adjusted to be consistent, and the sensitivity of the diaphragm 131 is higher.

Further, three protruding columns 116 may be provided, and all three protruding columns 116 are disposed on the side of the bottom surface of the valve housing 110 away from the lever 140, and the three protruding columns 116 may be disposed around the first protrusion 113 and located on the side of the first protrusion 113 away from the second protrusion 114, so as to further make the amplitudes of the diaphragms 131 consistent, and make the sensitivity of the diaphragms 131 higher.

In the embodiment of the present application, in order to facilitate the use of the gas pressure regulating valve 10, the gas pressure regulating valve 10 may be fixed on a control panel. Wherein the valve housing 110 and the valve cover 120 are located at the back of the control panel, and the pressing head 134 is located at the front of the control panel, so that when the engine needs to be started, the gas flows into the combustion chamber by controlling the pressing head 134.

Further, be connected with gas air inlet joint 117 on the valve casing 110, there is the gas passageway in the gas air inlet joint 117, gas passageway and import 111 intercommunication, gas air inlet joint 117 is used for connecting the gas intake pipe, and the one end and the valve casing 110 of gas air inlet joint 117 are connected, and the other end is used for connecting the gas intake pipe. The end of the gas inlet joint 117 away from the valve housing 110 protrudes out of the valve cover 120, that is, after the gas pressure regulating valve 10 is installed on the control panel, the end of the gas inlet joint 117 away from the valve housing 110 is located on the front surface of the control panel, so as to exchange gas inlet pipes, and introduce different gases into the gas pressure regulating valve 10, thereby facilitating the adjustment of the gas pressure regulating valve 10.

In order to mount the gas pressure regulating valve 10 on the control panel as described above, two through holes are provided on the control panel, and the pressing head 134 and the end of the gas inlet joint away from the valve housing 110 are respectively passed through the two through holes, and the gas pressure regulating valve 10 is fixed on the control panel by screws.

Correspondingly, the valve housing 110 is connected with a gas outlet connector 118, a gas channel is arranged in the gas outlet connector 118 and communicated with the outlet 112, the gas outlet connector 118 is used for connecting a gas outlet pipe, one end of the gas outlet connector 118 is connected with the valve housing 110, and the other end of the gas outlet connector 118 is used for connecting the gas outlet pipe. After the gas pressure regulating valve 10 is installed on the control panel, the gas outlet joint 118 is located on the back of the control panel, so that the installation of the gas pressure regulating valve 10 is more beautiful.

In the embodiment of the present application, a fourth protrusion 119 may be further disposed at the bottom of the valve housing 110, the fourth protrusion 119 protrudes from the bottom surface of the valve housing 110, and the protruding portion of the fourth protrusion 119 is located in the valve cavity 160, and a threaded hole is disposed on the fourth protrusion 119, so that the stroke of the threaded hole can be increased, and the threaded hole on the fourth protrusion 119 is matched with the stud to fix the gas pressure regulating valve 10, thereby meeting different installation methods.

The working principle of the gas pressure regulating valve 10 which runs under negative pressure provided by the embodiment of the application is as follows:

two through holes are formed in the control panel, and the ends of the pressing head 134 and the gas inlet joint 117, which are far away from the valve housing 110, respectively penetrate through the two through holes, and then the valve housing 110 and the valve cover 120 are fixed on the control panel through bolts. The valve housing 110, the valve cover 120, the gas outlet joint 118, the gas outlet pipe connected with the gas outlet joint 118 and one end of the gas inlet joint 117 close to the valve housing 110 are positioned on the back surface of the control panel, and the ends of the pressing head 134 and the gas inlet joint 117 far away from the valve housing 110 are positioned on the front surface of the control panel.

When the combustion chamber and/or the gas engine is opened and a force is applied to the pressing head 134 to move the pressing head 134 downward, the adjusting rod 132 connected to the pressing head 134 is pressed downward, and the first clamping piece 137, the diaphragm 131 and the second clamping piece 138 defined on the adjusting rod 132 are all recessed downward, so that the gas in the valve chamber 160 flows into the combustion chamber of the gas engine from the outlet 112. Meanwhile, as the adjusting rod 132 applies force to the second end of the lever 140, the second end of the lever 140 compresses the spring, the second end of the lever 140 is pressed downwards, the lever 140 rotates around the rotating shaft 146, the first end of the lever 140 is lifted upwards, the inlet 111 is exposed, and the gas in the gas inlet pipe enters the valve cavity 160 through the gas inlet joint 117 and the inlet 111, and flows into the combustion chamber from the outlet 112 after the negative pressure operation of the gas pressure reducing valve. After releasing the pressing head 134, the pressing head 134 is restored by the second spring 136.

When the gas engine is shut down and gas is not needed to be used, the combustion chamber and/or the engine does not have suction force on the gas in the valve cavity 160 any more, the gas enters the valve cavity 160 and then stays in the valve cavity 160, the diaphragm is enabled to be sunken upwards, the adjusting rod 132 limited on the diaphragm moves upwards, the second end of the lever 140 connected with the adjusting rod 132 is lifted upwards, the lever 140 rotates around the rotating shaft 146, the first end of the lever 140 is pressed downwards, the inlet 111 is sealed and closed through the rubber cover 144, and the gas in the gas inlet pipe is prevented from entering the valve cavity 160.

When the elastic coefficient of the first spring needs to be adjusted, a screwdriver can be inserted into a slot or a recess of the adjusting head 1521, the adjusting head 1521 is rotated, and the limiting part 1522 connected with the adjusting head 1521 rotates together, so that the adjusting piece 152 moves inwards (in the valve cavity 160) or outwards (out of the valve shell 110), so as to adjust the opening height at the inlet 111 of the valve shell 110, the flow rate and the flow velocity at the inlet 111, thereby adjusting the pressure parameter in the valve cavity 160 and meeting different gas requirements. After the pressure parameter adjustment in the valve cavity 160 is completed, the plug 153 is sealed.

The gas pressure regulating valve 10 of the negative pressure operation that this application embodiment provided has the beneficial effect to include:

(1) the gas demand of difference can be satisfied, and adaptability is wider.

(2) The pressure parameters are adjusted through the adjusting piece 152 and the first spring, the structure is simple, and the adjusting mode is easy.

(3) The diaphragm 131, and the first and second holding

pieces

137 and 138 provided on both sides of the diaphragm 131, the adjustment sensitivity of the diaphragm 131 can be made higher.

(4) The gas pressure regulating valve 10 is conveniently regulated by controlling the mode that the gas regulating valve is installed on the control panel.

(5) The whole structure of the gas pressure regulating valve 10 is reasonable in arrangement and more compact in structure.

The above description is only a few examples of the present application and is not intended to limit the present application, and various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A gas pressure regulating valve operating under negative pressure, comprising:

the diaphragm assembly is provided with a diaphragm component,

a valve housing sealingly connected to the diaphragm assembly and forming a valve cavity, the valve housing being provided with an inlet and an outlet communicating with the valve cavity;

a lever mounted to the valve chamber, a first end of the lever configured to close or open the inlet, a second end of the lever connected to the diaphragm assembly;

a reset assembly, wherein a first end of the reset assembly acts on the second end of the lever so that the first end of the lever has a movement tendency to block the inlet; the second end of the reset assembly is threadably connected to the valve housing to enable adjustment of the force applied by the reset assembly to the lever.

2. The gas pressure regulating valve according to claim 1, wherein said reset assembly comprises an elastic member and an adjusting member, said valve housing has a threaded hole, said adjusting member is threadedly engaged with said threaded hole, one end of said elastic member abuts against said second end of said lever and the other end of said elastic member abuts against said adjusting member.

3. The gas pressure regulating valve according to claim 2, wherein said elastic member is a first spring, said regulating member includes a regulating head and a limiting portion connected to said regulating head, said regulating head is in threaded engagement with said screw hole, said limiting portion extends into said first spring, and one end of said first spring, which is far from said lever, abuts against said regulating head.

4. The gas pressure regulating valve according to claim 3, wherein a gap is formed between said limiting portion and a wall of said screw hole, and an end of said first spring adjacent to said regulating head is located in said gap.

5. The gas pressure regulating valve according to claim 2, wherein said threaded hole extends to the outer surface of said valve housing, the end surface of said regulating member facing said outer surface is recessed with a locking groove, and a portion of said threaded hole adjacent to said outer surface is embedded with a plug.

6. A gas pressure regulating valve according to any one of claims 1 to 5, further comprising a valve cover, said diaphragm assembly including a diaphragm and an adjustment rod, said valve cover being mounted to and sealingly connecting said diaphragm to said valve housing, said adjustment rod having one end extending in a direction towards said valve cover and another end extending through said diaphragm and located within said valve chamber and fixedly connected to said second end of said lever, said diaphragm being defined on said adjustment rod.

7. The gas pressure regulating valve according to claim 6, wherein the peripheral edge of said diaphragm is of an arcuate configuration recessed toward said valve chamber.

8. The gas pressure regulating valve according to claim 7, wherein said diaphragm assembly further comprises a first clamping piece and a second clamping piece, said regulating rod passes through said first clamping piece, said diaphragm and said second clamping piece in sequence, and said first clamping piece, said diaphragm and said second clamping piece are all defined on said regulating rod.

9. The gas pressure regulating valve according to claim 8, wherein said first clamping piece and said second clamping piece are each provided with a plurality of hole structures.

10. The gas pressure regulating valve according to claim 8, wherein said first clamping piece and said second clamping piece each have a diameter less than a diameter of said diaphragm, such that said arcuate structure is exposed between said first clamping piece and said second clamping piece.