Compact pressure-adjustable piston type pressure reducing valve

Abstract

The utility model provides a compact pressure-adjustable piston type pressure reducing valve which comprises a valve body, a through valve cavity is formed in the valve body, an air inlet channel and an air outlet channel are arranged on the two sides of the valve cavity respectively, and a piston capable of elastically moving is arranged at the bottom of the valve cavity. A position-adjustable pressure regulating valve element is arranged on the upper portion of the valve cavity, an air inlet annular groove is formed in the middle of the pressure regulating valve element in a surrounding mode, and a pressure reducing hole is formed in the center of the pressure regulating valve; the air inlet annular groove is communicated with the air inlet channel, and a gap between the bottom of the pressure regulating valve element and the top of the piston is communicated with the air outlet channel. According to the pressure reducing valve, the pressure regulating valve element is rotated to move up and down to cause the change of the opening degree of the pressure reducing hole, so that the air outlet pressure is controlled, the air outlet pressure of a product is changed from constant to adjustable, the application range of the product is greatly widened, the air outlet amount of the product is stable and reliable, and good market competitiveness is achieved.

Description

Technical Field

[0001] The utility model relates to a gas pressure reducing valve, in particular to a pressure-adjustable piston type pressure reducing valve. Background Art

[0002] There are two types of pressure reducing methods for traditional gas pressure reducing valves. One is the diaphragm type pressure reducing valve, which has the disadvantage of complex product structure. When the inlet pressure (usually refers to the cylinder or pipeline pressure) changes, the outlet pressure fluctuates greatly and the output gas flow is unstable. The other is the piston type pressure reducing valve, which has the disadvantage that after a product is finalized, its outlet pressure cannot be adjusted and the product has a narrow scope of application. How to further optimize the pressure reducing valve structure, improve the product applicability and reliability, and achieve adjustable outlet pressure and stable outlet volume at a lower cost is a topic that the industry has been exploring and solving. Utility Model Content

[0003] In order to solve the problems existing in the background technology, the utility model provides a compact adjustable pressure piston pressure reducing valve. The pressure reducing valve can move up and down by rotating the pressure regulating valve core, causing the opening of the pressure reducing hole to change, thereby realizing the control of the outlet pressure, and making the product outlet pressure change from constant to adjustable, which greatly improves the application scope of the product. The product outlet volume is stable and reliable, and has good market competitiveness.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A compact adjustable pressure piston type pressure reducing valve comprises a valve body, characterized in that the valve body is provided with a valve cavity penetrating the upper and lower surfaces of the valve body, and an air inlet channel and an air outlet channel are respectively arranged on the valve body on both sides of the valve cavity, wherein the opening position of the air inlet channel on the valve cavity is higher than the opening position of the air outlet channel on the valve cavity; a resiliently movable piston is arranged at the bottom of the valve cavity; a pressure regulating valve core is arranged at the upper part of the valve cavity, and the position of the pressure regulating valve core in the valve cavity is adjustable; an air inlet annular groove is arranged on the outer wall surrounding the pressure regulating valve core in the middle part of the pressure regulating valve core, and a pressure reducing hole connecting the air inlet annular groove and the center of the bottom of the pressure regulating valve is arranged at the center of the pressure regulating valve; the air inlet annular groove is communicated with the opening of the air inlet channel on the valve cavity, and the gap between the bottom of the pressure regulating valve core and the top of the piston is communicated with the opening of the air outlet channel on the valve cavity.

[0006] The upper part of the pressure regulating valve core is provided with a threaded section, and the pressure regulating valve core is threadedly connected to the inner wall of the valve cavity through the threaded section.

[0007] The top end of the pressure regulating valve core is provided with a groove for an adapter tool, and the tool is used to drive the pressure regulating valve core to rotate.

[0008] The pressure regulating valve core is provided with annular sealing ring grooves at the upper and lower ends of the air inlet annular groove, and a valve core sealing ring is provided in the annular sealing ring groove.

[0009] The piston comprises a thin end and a thick end, wherein the thin end is inserted into the valve cavity, the thick end is located outside the valve cavity and an elastic mechanism is provided between the thick end and the valve body.

[0010] A piston sealing pad is arranged on the top end of the piston located inside the valve cavity.

[0011] The elastic mechanism is a piston spring.

[0012] The valve body also includes a valve back cover, which is detachably fixed to the valve body, and a piston cavity for placing the piston is formed between the valve back cover and the valve body.

[0013] An outward end of the air intake passage is connected with an air intake rod and an air intake nut.

[0014] One end of the air outlet channel facing outward is connected with a flow meter.

[0015] The pressure reducing valve described in the utility model can move up and down by rotating the pressure regulating valve core, causing the opening of the pressure reducing hole to change, thereby realizing the control of the outlet pressure, making the product outlet pressure change from constant to adjustable, greatly improving the application range of the product, and the product outlet volume is stable and reliable, with good market competitiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The utility model is further described below in conjunction with the accompanying drawings

[0017] Figure 1 This is a schematic diagram of the overall structure of the pressure reducing valve described in Example 1 of the utility model;

[0018] Figure 2 for Figure 1 Structural details of the middle valve body.

[0019] in:

[0020] Valve body 10, valve cavity 11, air inlet channel 12, air outlet channel 13, pressure regulating valve core 20, air inlet annular groove 21, pressure reducing hole 22, valve core sealing ring 23, piston 30, piston sealing gasket 31, piston spring 32, valve back cover 40, air inlet rod 50, air inlet nut 51, flow meter 60. DETAILED DESCRIPTION

[0021] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods:

[0022] Example 1

[0023] like Figure 1As shown, the utility model provides a compact adjustable pressure piston type pressure reducing valve, including a valve body 10, the valve body 10 having a valve cavity 11 penetrating the upper and lower surfaces of the valve body 10, the valve body on both sides of the valve cavity 11 are respectively provided with an air inlet channel 12 and an air outlet channel 13, wherein the opening position of the air inlet channel 12 on the valve cavity 11 is higher than the opening position of the air outlet channel 13 on the valve cavity 11.

[0024] A resiliently movable piston 30 is provided at the bottom of the valve cavity 11; the piston 30 blocks the bottom of the valve cavity 10 and can move up and down in the valve cavity 11 along the height direction of the valve cavity 11; a pressure regulating valve core 20 is provided in the upper part of the valve cavity 11, and an air intake annular groove 21 is provided in the middle of the pressure regulating valve core 20 and the outer wall surrounding the pressure regulating valve core 20, and a pressure reducing hole 22 connecting the air intake annular groove 21 and the bottom center of the pressure regulating valve 20 is provided in the center of the pressure regulating valve 20; the air intake annular groove 21 is communicated with the opening of the air intake channel 12 on the valve cavity 11, and the gap between the bottom of the pressure regulating valve core 20 and the top of the piston 30 is communicated with the opening of the air outlet channel 13 on the valve cavity 11.

[0025] The position of the pressure regulating valve core 20 in the valve chamber 11 is adjustable, and the position adjustment is achieved in the following manner:

[0026] The upper part of the pressure regulating valve core 20 has a threaded section, and the pressure regulating valve core 20 is threadedly connected to the inner wall of the valve cavity 11 through the threaded section. The top of the pressure regulating valve core 20 has a groove for an adapter tool, and the tool is used to drive the pressure regulating valve core to rotate. Specifically, the groove can be a flat groove or a cross groove, corresponding to a flat screwdriver and a cross screwdriver respectively. Use a screwdriver to insert into the groove, and after rotation, the pressure regulating valve core 20 can be driven to move its position in the valve cavity 11.

[0027] Annular sealing ring grooves are arranged on the pressure regulating valve core 20 at the upper and lower ends of the air inlet annular groove 21 , and a valve core sealing ring 23 is arranged in the annular sealing ring groove.

[0028] The piston 30 includes a thin end and a thick end. The thin end is inserted into the valve cavity 11 , and the thick end is located outside the valve cavity 11 . A piston spring 32 is provided between the thick end and the valve body 10 .

[0029] A piston sealing pad 31 is provided at the top end of the piston 30 located inside the valve cavity.

[0030] The valve body 10 further includes a valve rear cover 40 which is detachably fixed to the valve body 10 , and a piston cavity for placing a piston is formed between the valve rear cover 40 and the valve body 10 .

[0031] An outward end of the air inlet passage 12 is connected to an air inlet rod 50 and an air inlet nut 51 , and an outward end of the air outlet passage 13 is connected to a flow meter 60 .

[0032] When in use, the user rotates the pressure regulating valve core 20 with a slotted or cross screwdriver (or a hexagonal or plum wrench, etc.) to move the pressure regulating valve core 20 up and down along the valve cavity 11 .

[0033] When the pressure regulating valve core 20 moves upward, the pressure reducing hole 22 moves away from the piston sealing gasket 31, and the gap between the two increases. The gas balance at both ends of the piston 30 is broken, and the piston 30 moves in the direction of reducing the gap 31 between the pressure reducing hole 22 and the piston sealing gasket (that is, the piston 30 moves upward to keep the gas pressure at both ends balanced again). The upward movement of the piston 30 causes the compression of the piston spring 32 to increase, and the spring elastic force increases. At this time, the pressure reducing hole 22 will maintain a larger opening, and the outlet pressure increases;

[0034] When the pressure regulating valve core 20 moves downward, the pressure reducing hole 22 approaches the piston sealing gasket 31, and the gap between the two is reduced. The gas balance at both ends of the piston 30 is broken, and the piston 30 moves in the direction of increasing the gap between the pressure reducing hole 22 and the piston sealing gasket 31 (that is, the piston 30 moves downward to keep the gas pressure at both ends balanced again). The downward movement of the piston 30 causes the compression of the piston spring 32 to decrease, and the spring elastic force to decrease. At this time, the pressure reducing hole 22 will maintain a smaller opening, and the outlet pressure will decrease.

[0035] In summary, the user uses a flat-head or cross screwdriver (or hexagonal or plum-end wrench, etc.) to rotate the pressure regulating valve core so that it can move up and down, causing the opening of the pressure reducing hole to change, thereby achieving control of the outlet pressure, and making the product outlet pressure change from constant to adjustable, which greatly improves the product's scope of application, and the product's air output is stable and reliable, with good market competitiveness.

[0036] Those skilled in the art will recognize that various modifications, changes and combinations may be made to the above-mentioned embodiments without departing from the scope of protection of the present invention, and that such modifications, changes and combinations are considered to be within the scope of the original idea.

Claims

1. A compact adjustable pressure piston pressure reducing valve, comprising a valve body, characterized in that: The valve body has a valve cavity that passes through the upper and lower surfaces of the valve body, and the valve body on both sides of the valve cavity is respectively provided with an air inlet channel and an air outlet channel, wherein the opening position of the air inlet channel on the valve cavity is higher than the opening position of the air outlet channel on the valve cavity; A piston that can move elastically is arranged at the bottom of the valve cavity; A pressure regulating valve core is arranged at the upper part of the valve cavity, and the position of the pressure regulating valve core in the valve cavity is adjustable; An air intake annular groove is arranged on the outer wall of the pressure regulating valve core in the middle of the pressure regulating valve core, and a pressure reducing hole connecting the air intake annular groove and the bottom center of the pressure regulating valve is arranged at the center of the pressure regulating valve; The air inlet annular groove is communicated with the opening of the air inlet passage on the valve cavity, and the gap between the bottom of the pressure regulating valve core and the top of the piston is communicated with the opening of the air outlet passage on the valve cavity.

2. A compact adjustable pressure piston pressure reducing valve according to claim 1, characterized in that: The upper part of the pressure regulating valve core is provided with a threaded section, and the pressure regulating valve core is threadedly connected to the inner wall of the valve cavity through the threaded section.

3. A compact adjustable pressure piston pressure reducing valve as claimed in claim 2, characterized in that: The top end of the pressure regulating valve core is provided with a groove for an adapter tool, and the tool is used to drive the pressure regulating valve core to rotate.

4. A compact adjustable pressure piston pressure reducing valve as claimed in claim 2, characterized in that: The pressure regulating valve core is provided with annular sealing ring grooves at the upper and lower ends of the air inlet annular groove, and a valve core sealing ring is provided in the annular sealing ring groove.

5. A compact adjustable pressure piston pressure reducing valve as claimed in claim 4, characterized in that: The piston comprises a thin end and a thick end, wherein the thin end is inserted into the valve cavity, the thick end is located outside the valve cavity and an elastic mechanism is provided between the thick end and the valve body.

6. A compact adjustable pressure piston pressure reducing valve as claimed in claim 4, characterized in that: A piston sealing pad is arranged on the top end of the piston located inside the valve cavity.

7. A compact adjustable pressure piston pressure reducing valve as claimed in claim 5, characterized in that: The elastic mechanism is a piston spring.

8. A compact adjustable pressure piston pressure reducing valve as claimed in claim 7, characterized in that: The valve body also includes a valve rear cover, which is detachably fixed to the valve body, and a piston cavity for placing the piston is formed between the valve rear cover and the valve body.

9. A compact adjustable pressure piston pressure reducing valve according to claim 8, characterized in that: An outward end of the air intake passage is connected with an air intake rod and an air intake nut.

10. A compact adjustable pressure piston type pressure reducing valve according to claim 9, characterized in that: One end of the air outlet channel facing outward is connected with a flow meter.

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