Fuel gas pressure reducing valve

Abstract

The utility model discloses a gas pressure reducing valve, which comprises a valve sleeve, a gas inlet cavity and a gas outlet cavity are arranged on the lower portion of the valve sleeve, a control cavity is arranged on the upper portion of the valve sleeve, and the gas inlet cavity is communicated with the control cavity through a gas flow channel. The control cavity is communicated with the air outlet cavity; the head of the sealing assembly is arranged in the air inlet cavity, and the tail of the sealing assembly penetrates through the air flow channel and is located in the control cavity; a gap is reserved between the outer wall of the tail of the sealing assembly and the inner wall of the flow gas channel for gas to flow through. The diameter of the head of the sealing assembly is larger than that of the flow air channel. The valve body is arranged in the control cavity and seals the control cavity, a groove is formed in the lower portion of the valve body, and the tail of the sealing assembly is located in the groove; the tail portion of the sealing assembly slides in the groove in a seamless mode. The variable-pressure cavity is communicated with the air outlet cavity; and the pressure regulating piece is arranged in the pressure regulating cavity, is an elastic body and is used for controlling the position of the sealing assembly in the groove. The utility model has the advantages of simple structure, low requirement on assembly process, and stable and reliable product performance.

Description

Technical Field

[0001] The utility model relates to the field of gas pressure reducing valves, in particular to a fuel gas pressure reducing valve. Background Art

[0002] The gas pressure regulator (also called gas pressure regulating valve) is a straight-rod and lever-type pressure differential feedback control pressure regulating device. The gas in the gas cylinder is liquid, and the pressure is too high, so it must be reduced before it is suitable for combustion in the stove.

[0003] The principle is: high-pressure medium is filled into a relatively large cavity through a small hole to achieve pressure reduction. In fact, it relies on interception to reduce pressure. One side of the diaphragm or piston is the outlet cavity, and the other side is the artificial pressure. The valve stem that controls the size of the small hole is connected to the diaphragm (piston). In this way, as long as a fixed pressure is given, the pressure in the outlet cavity will always be equal to this pressure. This given pressure can be provided by a spring, air source or hydraulic source.

[0004] At present, most manufacturers at home and abroad use a diaphragm spring type pressure regulating structure, which includes an upper and lower shell structure, a diaphragm 150 and a diaphragm pad 160 are arranged between the upper and lower shells, and a pressure regulating spring 170 is arranged between the upper end of the diaphragm 150 and the upper shell; and the regulating mechanism linked with the driving diaphragm 150 is a lever structure, such as Figure 1 As shown, the adjustment mechanism in its structure includes many internal control parts such as lever pad 100, lever pin 110, lever 120, diaphragm screw 130, clamping nut 140, etc., and each component needs to be installed accurately, otherwise the matching tolerance will be expanded, resulting in product performance deviation and even product leakage and functional failure. Utility Model Content

[0005] In view of the above-mentioned defects in the prior art, the purpose of the utility model is to provide a gas pressure reducing valve with a simple structure, low requirements for assembly process, and stable and reliable product performance.

[0006] The purpose of the utility model is achieved through such technical solution:

[0007] A gas pressure reducing valve, comprising:

[0008] The valve sleeve has an air inlet cavity and an air outlet cavity at the lower part and a control cavity at the upper part. The air inlet cavity is connected to the control cavity through a linear air flow channel; the control cavity is connected to the air outlet cavity;

[0009] The sealing component has a head portion arranged in the air inlet cavity and a tail portion passing through the air flow passage and arranged in the control cavity; a gap is left between the outer wall of the tail portion of the sealing component and the inner wall of the air flow passage for the gas to flow through; the diameter of the head portion of the sealing component is larger than the diameter of the air flow passage, and after the sealing component moves toward the control cavity, the head portion of the sealing component closes the air flow passage;

[0010] The valve body is arranged in the control cavity to close the control cavity. A groove is arranged at the lower part of the valve body. The tail of the closing component is located in the groove, and the groove is divided into a pressure-changing cavity and a pressure-regulating cavity from top to bottom. The tail of the closing component slides seamlessly in the groove to change the volume of the pressure-changing cavity and the pressure-regulating cavity. The pressure-changing cavity is connected to the air outlet cavity.

[0011] The pressure regulating part is arranged in the pressure regulating cavity and is an elastic body. It controls the resistance when the closed component changes the size of the pressure changing cavity and the pressure regulating cavity.

[0012] Furthermore, the closure assembly comprises:

[0013] The ejector pin has a T-shaped cross section, a head portion of which is located in the air inlet cavity, and a tail portion of which passes through the air flow passage and is located in the control cavity;

[0014] The sliding component is arranged in the groove, dividing the groove into a voltage-changing chamber and a voltage-regulating chamber from top to bottom; the sliding component slides seamlessly along the inner wall of the groove, the lower end is connected to the ejector pin, and the upper end contacts the voltage-regulating part.

[0015] Furthermore, a concave sliding cavity matching the head of the ejector pin is provided in the air inlet cavity, and the diameter of the sliding cavity is larger than the diameter of the ejector pin; the sliding cavity is communicated with the air flow channel.

[0016] Furthermore, the ejector pin and the sliding assembly are separate parts, and a top cap is coaxially arranged at the lower end of the head of the ejector pin; the diameter of the top cap is smaller than the diameter of the head of the ejector pin; and a sealing spring is arranged outside the top cap;

[0017] One end of the sealing spring abuts against the head of the ejector pin, and the other end abuts against the valve sleeve; when the air outlet cavity is at low pressure, a gap is left between the head of the ejector pin and the bottom of the sliding cavity; when the air outlet cavity is at high pressure, the head of the ejector pin contacts the bottom of the sliding cavity to close the air flow channel.

[0018] Furthermore, a through hole is provided at the bottom of the valve body opposite to the axis of the ejector pin; the diameter of the through hole is larger than the head of the ejector pin; a plug is provided in the through hole to close the through hole, and the lower end of the sealing spring abuts against the upper end of the plug; the air inlet cavity is located on the outside of the sealing spring or in the plug to connect the outside of the valve sleeve with the sliding cavity.

[0019] Furthermore, a sealing layer is provided on the surface of the ejector head facing the bottom of the sliding cavity.

[0020] Furthermore, the sliding assembly comprises:

[0021] The sliding sleeve has a diameter smaller than that of the groove; the side wall of the sliding sleeve is provided with an annular groove; the tail of the ejector pin contacts the lower part of the sliding sleeve;

[0022] Two first O-rings are arranged in the annular groove; the outer diameter of the first O-ring is larger than the diameter of the groove.

[0023] Furthermore, a concave accommodating cavity is provided at the lower part of the sliding sleeve, and the tail of the ejector pin contacts the bottom of the accommodating cavity; the accommodating cavity faces the air flow channel.

[0024] Furthermore, the pressure regulating component is a pressure regulating spring, and its two ends are respectively against the sliding component and the bottom of the pressure regulating chamber; and the valve body is provided with a balancing air hole connecting the pressure regulating chamber with the outside.

[0025] Furthermore, an inner wall of the control chamber of the valve sleeve is provided with an internal thread; an outer surface of the valve body is provided with an external thread matching the internal thread; an annular groove is provided at the lower part of the valve body, and the annular groove is located on one side of the external thread; a second O-ring is provided in the annular groove; after the valve body and the valve sleeve are threadedly connected, the valve sleeve and the valve body squeeze the second O-ring to each other to close the control chamber.

[0026] Due to the adoption of the above technical solution, the utility model has the following advantages:

[0027] 1. The pressure change of the variable pressure chamber connected to the air outlet chamber forces the closing component to move in the valve body, thereby changing the displacement of the closing component in the air flow channel, and then changing the size of the gap between the head of the closing component and the air flow channel, so as to achieve adaptive adjustment of the air intake volume according to the outlet pressure, and finally achieve the effect of reducing pressure and outlet pressure and temperature.

[0028] 2. The closing component and the valve body are connected by a closed sliding connection, and the closing component and the valve sleeve are designed with a clearance fit to reduce the difficulty of assembly and the error requirements of assembly. At the same time, it also plays a role in limiting the movement of the closing component to ensure that the gas works stably in the air flow channel.

[0029] 3. By selecting different pressure regulating parts, the outlet pressure of the air outlet cavity can be adjusted to achieve controllable pressure reduction.

[0030] Other advantages, objectives and features of the present invention will be described in the following description to some extent, and will be apparent to those skilled in the art based on the following examination and study, or may be taught from the practice of the present invention to some extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings of the present utility model are as follows:

[0032] Figure 1 Diagram of the cross-sectional structure of a diaphragm spring pressure regulating valve

[0033] Figure 2 It is a schematic cross-sectional structure diagram of the gas pressure reducing valve in Example 1 when the gas outlet cavity is at low pressure.

[0034] Figure 3 for Figure 2 Enlarged structural diagram at A in the middle.

[0035] Figure 4 for Figure 2 Enlarged structural diagram at B in the middle.

[0036] Figure 5 It is a schematic cross-sectional structure diagram of the gas pressure reducing valve in Example 1 when the gas outlet cavity is at high pressure.

[0037] Figure 6 for Figure 5 Enlarged structural diagram at point C in the middle.

[0038] Figure 7 It is a schematic cross-sectional structure diagram of the gas pressure reducing valve in Example 2 when the gas outlet cavity is at low pressure.

[0039] In the figure: 1. valve sleeve; 11. air inlet chamber; 12. air outlet chamber; 13. control chamber; 131. internal thread; 14. air flow channel; 15. sliding chamber; 16. through hole; 17. plug; 21. ejector pin; 211. top cap; 212. sealing spring; 213. sealing layer; 221. sliding sleeve; 2211. annular groove; 2212. accommodating chamber; 222. first O-ring; 3. valve body; 31. groove; 311. pressure changing chamber; 312. pressure regulating chamber; 32. balancing air hole; 33. external thread; 34. annular groove; 35. second O-ring; 4. pressure regulating member. DETAILED DESCRIPTION

[0040] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0041] Embodiment 1:

[0042] like Figures 2 to 4 As shown, the gas pressure reducing valve comprises:

[0043] The valve sleeve 1 has an air inlet cavity 11 and an air outlet cavity 12 at the lower part and a control cavity 13 at the upper part. The air inlet cavity 11 is connected to the control cavity 13 through a linear air flow channel 14; the control cavity 13 is connected to the air outlet cavity 12;

[0044] The head of the closing component is arranged in the air inlet cavity 11, and the tail passes through the air flow passage 14 and is arranged in the control cavity 13; a gap is left between the outer wall of the tail of the closing component and the inner wall of the air flow passage 14 for the gas to flow through; the diameter of the head of the closing component is larger than the diameter of the air flow passage 14, and after the closing component moves toward the control cavity 13, the head of the closing component closes the air flow passage 14;

[0045] The valve body 3 is arranged in the control chamber 13 to close the control chamber 13. A groove 31 is arranged at the lower part of the valve body 3. The tail of the closing component is located in the groove 31, and the groove 31 is divided into a pressure-changing chamber 311 and a pressure-regulating chamber 312 from top to bottom. The tail of the closing component slides seamlessly in the groove 31 to change the volume of the pressure-changing chamber 311 and the pressure-regulating chamber 312. The pressure-changing chamber 311 is connected to the air chamber 12.

[0046] The pressure regulating member 4 is disposed in the pressure regulating chamber 312 and is an elastic body, and controls the resistance when the sealing component changes the size of the pressure changing chamber 311 and the pressure regulating chamber 312 .

[0047] In this embodiment, the sealing component includes:

[0048] The ejector 21 has a T-shaped cross section, with its head located in the air inlet cavity 11 and its tail passing through the air flow passage 14 and located in the control cavity 13;

[0049] The sliding component is arranged in the groove 31, dividing the groove 31 into a voltage-changing chamber 311 and a voltage-regulating chamber 312; the sliding component slides seamlessly along the inner wall of the groove 31, with the lower end connected to the ejector 21 and the upper end in contact with the voltage-regulating member 4.

[0050] When the ejector pin 21 and the sliding assembly are integrated (made by 3D printing), the movement of the sliding assembly after being compressed drives the movement of the ejector pin 21, so that the ejector pin 21 controls the size of the open cross-section of the airway 14, thereby achieving the purpose of controlling the flow rate.

[0051] In this embodiment, a concave sliding cavity 15 matching the head of the ejector pin 21 is provided in the air inlet cavity 11 , and the diameter of the sliding cavity 15 is larger than the diameter of the ejector pin 21 ; the sliding cavity 15 is communicated with the air flow channel 14 .

[0052] The sliding cavity 15 can limit the swing of the ejector pin 21 when it slides, without affecting the flow of gas. The bottom of the sliding cavity 15 fits better with the head of the ejector pin 21, so as to better control the size of the open cross section of the gas flow channel 14, or even close it.

[0053] In this embodiment, the ejector member 21 and the sliding assembly are separate parts, and a top cap 211 is coaxially arranged at the lower end of the head of the ejector member 21; the diameter of the top cap 211 is smaller than the diameter of the head of the ejector member 21; and a sealing spring 212 is arranged on the outer sleeve of the top cap 211;

[0054] One end of the sealing spring 212 abuts against the head of the ejector member 21, and the other end abuts against the valve sleeve 1; when the air outlet cavity 12 is at low pressure, a gap is left between the head of the ejector member 21 and the bottom of the sliding cavity 15; when the air outlet cavity 12 is at high pressure, the head of the ejector member 21 contacts the bottom of the sliding cavity 15, closing the air flow channel 14.

[0055] In order to produce and assemble the components, the ejector 21 and the sliding assembly are two components, and are respectively inserted and installed from the lower and upper parts of the valve sleeve 1. At the same time, in order to realize that the ejector 21 can move up to close or reduce the air flow channel 14 when the air outlet cavity 12 is at high pressure, a sealing spring 212 is arranged at the bottom of the ejector 21. When the sliding assembly moves up, the downward force applied to the tail of the ejector 21 disappears, and the sealing spring 212 pushes the ejector 21 upward to achieve the function of closing or reducing the air flow channel 14.

[0056] In this embodiment, a through hole 16 is provided at the bottom of the valve body 3 opposite to the axis of the ejector pin 21; the diameter of the through hole 16 is larger than the head of the ejector pin 21; a plug 17 is provided in the through hole 16 to close the through hole 16, and the lower end of the sealing spring 212 is abutted against the upper end of the plug 17; the air inlet chamber 11 is located on the outside of the sealing spring 212.

[0057] The ejector pin 21 is installed in the valve sleeve 1 through the perforation, and the sealing spring 212 is restricted by the plug 17 and the valve sleeve 1 is sealed. The plug 17 can be sealed with the valve sleeve 1 by thread or by gluing.

[0058] In this embodiment, a sealing layer 213 is provided on the surface of the head of the ejector pin 21 that faces the bottom of the sliding cavity 15 .

[0059] The sealing layer 213 can be provided to achieve effective sealing when complete sealing is required (when the pressure of the gas outlet cavity 12 reaches the designed maximum value), and prevent gas backflow when the pressure of the gas outlet cavity 12 is greater than that of the gas inlet cavity 11 (backfire), thus forming a function similar to a one-way valve.

[0060] In this embodiment, the sliding assembly includes:

[0061] The diameter of the sliding sleeve 221 is smaller than that of the groove 31; the side wall of the sliding sleeve 221 is provided with an annular groove 2211; the tail of the ejector 21 contacts the lower part of the sliding sleeve 221;

[0062] Two first O-rings 222 are disposed in the annular groove 2211 ; the outer diameter of the first O-rings 222 is greater than the diameter of the groove 31 .

[0063] The first O-ring 222 is used to achieve sealing and sliding.

[0064] In this embodiment, a concave accommodating chamber 2212 is provided at the lower portion of the sliding sleeve 221 , and the tail of the ejector 21 contacts the bottom of the accommodating chamber 2212 ; the accommodating chamber 2212 faces the air flow channel 14 .

[0065] The accommodation chamber 2212 can be provided to guide the gas passing through the gas flow channel 14 to avoid whistling of the gas flow and reduce noise.

[0066] In this embodiment, the pressure regulating member 4 is a pressure regulating spring, and its two ends are respectively against the sliding assembly and the bottom of the pressure regulating chamber 312; the valve body 3 is provided with a balancing air hole 32 that connects the pressure regulating chamber 312 with the outside.

[0067] The balancing air hole 32 can make the pressure control of the air cavity 12 positively correlated only with the pressure regulating spring, and is not affected by the degree of compression of the pressure regulating spring and the pressure of the compressed or expanded gas in the pressure regulating cavity 312, so that the pressure regulation is more precise.

[0068] In this embodiment, the inner wall of the control chamber 13 of the valve sleeve 1 is provided with an internal thread 131; the outer surface of the valve body 3 is provided with an external thread 33 matching the internal thread 131; the lower part of the valve body 3 is provided with an annular groove 34, and the annular groove 34 is located on one side of the external thread 33; a second O-ring 35 is provided in the annular groove 34; after the valve body 3 is threadedly connected to the valve sleeve 1, the valve sleeve 1 and the valve body 3 squeeze the second O-ring 35 against each other to close the control chamber 13.

[0069] The gas pressure reducing valve of this embodiment is used as follows: when the pressure of the air inlet chamber 11 is greater than that of the air outlet chamber 12, and the pressure of the air outlet chamber 12 is lower than a preset value, the gas flows into the sliding chamber 15 through the air inlet chamber 11, then enters the gas flow channel 14, then flows through the accommodating chamber 2212 and the pressure changing chamber 311, and finally flows into the air outlet chamber 12, forming a natural flow of the gas.

[0070] As the pressure in the air outlet chamber 12 increases, the gas in the accommodating chamber 2212 and the pressure changing chamber 311 pushes the sleeve 221 to move upward, forcing the pressure regulating part 4 to store force. At the same time, the downward force of the sleeve 221 on the ejector part 21 is weakened. The ejector part 21 is pushed upward by the sealing spring 212, forcing the ejector part 21 to move upward and always keep against the bottom of the accommodating chamber 2212 of the sleeve 221.

[0071] During the upward movement of the ejector 21, the cross section of the air passage 14 connecting the sliding chamber 15 is reduced, and the gas passing through the air passage 14 is reduced. In this way, as the gas in the outlet chamber 12 is consumed by other equipment, the pressure in the outlet chamber 12 will not continue to rise. If the gas in the outlet chamber 12 is not consumed by other equipment, as the pressure in the outlet chamber 12 continues to increase, the sliding sleeve 221 continues to move upward under the action of pressure until the ejector 21 closes the air passage 14, as shown in FIG. Figures 5 and 6 As shown, at this time, the gas cannot enter the accommodating chamber 2212 and the pressure-changing chamber 311 through the gas flow channel 14, thereby preventing the pressure of the gas outlet chamber 12 from being too high.

[0072] When the pressure of the gas outlet cavity 12 is less than the maximum preset value, as the pressure decreases, the pressure regulating member 4 forces the sliding sleeve 221 to slide downward, thereby pressing the ejector member 21 downward, thereby opening a passage for the gas to enter the gas outlet cavity 12. The whole process realizes adaptive dynamic adjustment.

[0073] Embodiment 2:

[0074] The difference between this embodiment and embodiment 1 is that the position of the air inlet cavity 11 is set. Specifically, the air inlet cavity 11 is set in the plug head 17, that is, the plug head 17 is set to a hollow structure. Figure 7 As shown, it not only facilitates the installation of the ejector 21, but also limits the sealing spring 212, and also adjusts the connection position between the air inlet cavity 11 and the outside, realizes a 90-degree turn of the air inlet and outlet, and facilitates installation in some environments.

[0075] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in the field should understand that the technical solution of the utility model can be modified or replaced by equivalents without departing from the purpose and scope of the technical solution, which should be included in the scope of the claims of the utility model.

Claims

1. A gas pressure reducing valve, characterized in that: include: The valve sleeve has an air inlet cavity and an air outlet cavity at the lower part and a control cavity at the upper part. The air inlet cavity is connected to the control cavity through a linear air flow channel; the control cavity is connected to the air outlet cavity; The sealing component has a head portion arranged in the air inlet cavity and a tail portion passing through the air flow passage and arranged in the control cavity; a gap is left between the outer wall of the tail portion of the sealing component and the inner wall of the air flow passage for the gas to flow through; the diameter of the head portion of the sealing component is larger than the diameter of the air flow passage, and after the sealing component moves toward the control cavity, the head portion of the sealing component closes the air flow passage; The valve body is arranged in the control cavity to close the control cavity. A groove is arranged at the lower part of the valve body. The tail of the closing component is located in the groove, and the groove is divided into a pressure-changing cavity and a pressure-regulating cavity from top to bottom. The tail of the closing component slides seamlessly in the groove to change the volume of the pressure-changing cavity and the pressure-regulating cavity. The pressure-changing cavity is connected to the air outlet cavity. The pressure regulating part is arranged in the pressure regulating cavity and is an elastic body. It controls the resistance when the closed component changes the size of the pressure changing cavity and the pressure regulating cavity.

2. The gas pressure reducing valve according to claim 1, characterized in that: The closure assembly comprises: The ejector pin has a T-shaped cross section, a head portion of which is located in the air inlet cavity, and a tail portion of which passes through the air flow passage and is located in the control cavity; The sliding component is arranged in the groove, dividing the groove into a voltage-changing chamber and a voltage-regulating chamber from top to bottom; the sliding component slides seamlessly along the inner wall of the groove, the lower end is connected to the ejector pin, and the upper end contacts the voltage-regulating part.

3. The gas pressure reducing valve according to claim 2, characterized in that: The air inlet cavity is provided with an inwardly concave sliding cavity matched with the head of the ejector pin, the diameter of the sliding cavity is larger than the diameter of the ejector pin; the sliding cavity is communicated with the air flow channel.

4. The gas pressure reducing valve according to claim 3, characterized in that: The ejector pin and the sliding assembly are separate parts, and a top cap is coaxially arranged at the lower end of the head of the ejector pin; the diameter of the top cap is smaller than the diameter of the head of the ejector pin; and a sealing spring is arranged outside the top cap; One end of the sealing spring abuts against the head of the ejector pin, and the other end abuts against the valve sleeve; when the air outlet cavity is at low pressure, a gap is left between the head of the ejector pin and the bottom of the sliding cavity; when the air outlet cavity is at high pressure, the head of the ejector pin contacts the bottom of the sliding cavity to close the air flow channel.

5. The gas pressure reducing valve according to claim 4, characterized in that: A through hole is provided at the bottom of the valve body, facing the axis of the ejector pin; the diameter of the through hole is larger than the head of the ejector pin; a plug is provided in the through hole to close the through hole, and the lower end of the sealing spring abuts against the upper end of the plug; the air inlet cavity is located outside the sealing spring or inside the plug to connect the outside of the valve sleeve with the sliding cavity.

6. The gas pressure reducing valve according to claim 4, characterized in that: A sealing layer is provided on the surface of the ejector pin head facing the bottom of the sliding cavity.

7. The gas pressure reducing valve according to claim 4, characterized in that: The sliding assembly comprises: The sliding sleeve has a diameter smaller than that of the groove; the side wall of the sliding sleeve is provided with an annular groove; the tail of the ejector pin contacts the lower part of the sliding sleeve; Two first O-rings are arranged in the annular groove; the outer diameter of the first O-ring is larger than the diameter of the groove.

8. The gas pressure reducing valve according to claim 7, characterized in that: A concave accommodating cavity is provided at the lower part of the sliding sleeve, and the tail of the ejector pin contacts the bottom of the accommodating cavity; the accommodating cavity faces the air flow channel.

9. The gas pressure reducing valve according to claim 4, characterized in that: The pressure regulating member is a pressure regulating spring, and its two ends are respectively against the sliding component and the bottom of the pressure regulating chamber; the valve body is provided with a balancing air hole connecting the pressure regulating chamber with the outside.

10. The gas pressure reducing valve according to claim 4, characterized in that: The inner wall of the control cavity of the valve sleeve is provided with an internal thread; the outer surface of the valve body is provided with an external thread matching the internal thread; the lower part of the valve body is provided with an annular groove, and the annular groove is located on one side of the external thread; a second O-ring is provided in the annular groove; after the valve body and the valve sleeve are threadedly connected, the valve sleeve and the valve body squeeze the second O-ring to close the control cavity.

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