Pressure-adjustable piston type pressure reducing valve

Abstract

An air inlet channel, an air outlet channel and a pressure reducing hole which are communicated with one another are arranged in a valve body of the pressure-adjustable piston type pressure reducing valve, a piston is arranged in the pressure reducing hole, a pressure adjusting mechanism is arranged on the outer side of the piston and comprises a piston spring, a spring washer and a pressure adjusting screw, and the pressure adjusting screw is connected with a spring washer touch screen through a conical surface at the front end of the pressure adjusting screw. The pressure adjusting screw moves in the valve body to change the shape of the spring gasket, so that the position of the piston in the pressure reducing hole is changed, and then the air outlet pressure and the air outlet flow are changed. The device has the advantages of simple structure, simple operation, high reliability, low cost and the like.

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 an adjustable pressure piston type pressure reducing valve, which has a pressure regulating mechanism arranged at the rear end of the piston of a traditional piston type pressure reducing valve, and pushes the spring gasket to deform by a pressure regulating screw to increase or decrease the compression amount of the spring, thereby changing the position of the piston, thereby achieving changes in the outlet pressure and outlet flow rate.

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

[0005] A pressure-adjustable piston-type pressure-reducing valve comprises a valve body, wherein the valve body is provided with an air inlet channel, an air outlet channel and a pressure-reducing hole, wherein the air inlet channel and the air outlet channel are connected through the pressure-reducing hole, wherein a piston is provided in the pressure-reducing hole, and a pressure-regulating mechanism is provided on the outer side of the piston, wherein the pressure-regulating mechanism realizes a change in the opening of the pressure-reducing hole and thus realizes adjustment of the outlet pressure by changing the position of the piston in the pressure-reducing hole, wherein the pressure-regulating mechanism comprises a piston spring, a spring gasket and an adjustable movable part, wherein one end of the piston spring is connected to the piston, and the other end is connected to the spring gasket, wherein the spring gasket is tightly attached to the valve body under the action of the piston spring, wherein one end of the adjustable movable part extends into the valve body and touches the spring gasket, and wherein the adjustable movable part realizes a change in the shape of the spring gasket by moving in the valve body so as to realize a change in the position of the piston in the pressure-reducing hole.

[0006] A piston chamber is arranged on the side wall of the valve body surrounding the pressure reducing hole. The piston comprises a thin piston end extending into the pressure reducing hole and a thick piston end located in the piston chamber. A spring gasket is arranged at one end of the piston chamber away from the thick piston end. The piston spring is arranged between the spring gasket and the thick piston end.

[0007] The adjustable movable part is a pressure regulating screw, and the pressure regulating screw extends into the valve body by being screwed in.

[0008] The front end of the pressure regulating screw extending into the valve body is a conical surface, and the pressure regulating screw contacts the spring gasket through the conical surface.

[0009] The taper of the conical surface is 90 degrees.

[0010] The spring washer is V-shaped or flat-plate-shaped.

[0011] The valve body at one end of the spring gasket disposed in the piston chamber is provided with a gasket fulcrum, and the spring gasket touches the gasket fulcrum under the compression of the piston spring.

[0012] An outward end of the air intake passage is connected with an air intake rod and an air intake nut.

[0013] The valve body is also provided with a pressure gauge, which is communicated with the pressure reducing hole through a pipeline.

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

[0015] The pressure reducing valve of the utility model can adjust the outlet pressure by rotating the pressure regulating screw, and has the advantages of simple structure, easy operation, high reliability, low cost, etc. 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 cross-sectional view of the pressure reducing valve according to Embodiment 1 of the present utility model;

[0018] in:

[0019] Valve body 10, air inlet channel 11, air outlet channel 12, pressure reducing hole 13, air inlet rod 14, air inlet nut 15, piston chamber 16, piston 20, piston spring 21, spring gasket 22, pressure regulating screw 23, gasket fulcrum 24, valve back cover 30, retaining ring 31, pressure gauge 40, flow meter 50. DETAILED DESCRIPTION

[0020] The utility model is further described below in conjunction with the accompanying drawings and specific implementation methods:

[0021] Example 1

[0022] like Figure 1As shown, an adjustable pressure piston type pressure reducing valve includes a valve body 10, in which an air inlet channel 11, an air outlet channel 12 and a pressure reducing hole 13 are provided, the air inlet channel 11 and the air outlet channel 12 are connected through the pressure reducing hole 13, a piston 20 is provided in the pressure reducing hole 13, and a piston chamber 16 is provided on the side wall of the valve body 10 surrounding the pressure reducing hole 13, and the piston 20 includes a piston thin end extending into the pressure reducing hole 13 and a piston thick end located in the piston chamber 16.

[0023] A pressure regulating mechanism is provided in the piston chamber 16 , and the pressure regulating mechanism changes the opening of the pressure reducing hole 13 by changing the position of the piston in the pressure reducing hole 13 , thereby adjusting the outlet pressure.

[0024] Specifically, the pressure regulating mechanism includes a piston spring 21, a spring gasket 24 and a pressure regulating screw 23. One end of the piston spring 21 is connected to the thick end of the piston, and the other end is connected to the spring gasket 24. The spring gasket 24 is tightly attached to the valve body 10 under the action of the piston spring 21. One end of the pressure regulating screw 23 extends into the valve body 10 and touches the spring gasket 24. The pressure regulating screw 23 changes the shape of the spring gasket 24 by moving in the valve body 10 to change the position of the piston 20 in the pressure reducing hole 13.

[0025] The front end of the pressure regulating screw 23 extending into the valve body 10 is a conical surface, and the pressure regulating screw 23 contacts the spring gasket 22 through the conical surface.

[0026] Preferably, the taper of the conical surface is 90 degrees, but it can also be other angles, so that the pressure regulating screw can achieve better thrust on the spring gasket.

[0027] In order to improve the efficiency and pressure regulating range of pressure regulation, the spring gasket 22 is designed to be V-shaped or flat. The valve body 10 at one end of the spring gasket 22 is provided in the piston chamber 16 and has a gasket fulcrum 24, and the spring gasket 22 touches the gasket fulcrum 24 under the compression of the piston spring 21.

[0028] The piston chamber 16 has an opening, which is closed by a valve rear cover 30 , and the valve rear cover 30 is fixed to the valve body 10 by a retaining spring 31 .

[0029] An outward end of the air intake passage 11 is connected with an air intake rod 14 and an air intake nut 15 .

[0030] A pressure gauge 40 is also provided on the valve body 10 . The pressure gauge 40 is communicated with the pressure reducing hole 13 through a pipeline. A flow meter 50 is connected to an outward end of the air outlet channel 12 .

[0031] When the pressure-adjusting screw 23 rotates forward (inward), its conical surface pushes the spring gasket 22 downward, increasing the compression of the piston spring 22, and the elastic force of the piston spring 22 increases, causing the piston 20 to move downward, increasing the opening of the pressure-reducing hole 13, and increasing the outlet pressure; conversely, when the pressure-adjusting screw 23 rotates backward (outward), its conical surface leaves the spring gasket 22 upward, the piston spring 21 rebounds, the compression decreases, the elastic force of the piston spring 21 decreases, the piston 20 moves upward, the opening of the pressure-reducing hole 13 decreases, and the outlet pressure decreases. That is, the adjustable pressure piston-type pressure reducing valve adjusts the outlet pressure by adjusting the rotation of the pressure-adjusting screw 23. Under the action of the gasket fulcrum 24, the spring gasket 22 increases the compression range of the spring, and adds an adjustable spring force to the constant piston thrust, thereby changing the product outlet pressure from constant to adjustable, greatly improving the product's scope of application, and the product's air output is stable and reliable, with good market competitiveness.

[0032] 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 pressure-adjustable piston-type pressure reducing valve, comprising a valve body, wherein the valve body is provided with an air inlet channel, an air outlet channel and a pressure reducing hole, wherein the air inlet channel and the air outlet channel are connected through the pressure reducing hole, wherein a piston is provided in the pressure reducing hole, and a pressure regulating mechanism is provided outside the piston, wherein the pressure regulating mechanism changes the opening of the pressure reducing hole by changing the position of the piston in the pressure reducing hole, thereby adjusting the outlet pressure, and wherein the valve body is provided with an air inlet channel, an air outlet channel and a pressure reducing hole, wherein the air inlet channel and the air outlet channel are connected through the ... pressure are adjusted. The pressure regulating mechanism includes a piston spring, a spring gasket and an adjustable movable part. One end of the piston spring is connected to the piston, and the other end is connected to the spring gasket. The spring gasket is tightly attached to the valve body under the action of the piston spring. One end of the adjustable movable part extends into the valve body and touches the spring gasket. The adjustable movable part changes the shape of the spring gasket by moving in the valve body to change the position of the piston in the pressure reducing hole.

2. The adjustable pressure piston pressure reducing valve according to claim 1, characterized in that: A piston chamber is arranged on the side wall of the valve body surrounding the pressure reducing hole. The piston comprises a thin piston end extending into the pressure reducing hole and a thick piston end located in the piston chamber. A spring gasket is arranged at one end of the piston chamber away from the thick piston end. The piston spring is arranged between the spring gasket and the thick piston end.

3. The adjustable pressure piston pressure reducing valve according to claim 2, characterized in that: The adjustable movable part is a pressure regulating screw, and the pressure regulating screw extends into the valve body by being screwed in.

4. The adjustable pressure piston pressure reducing valve according to claim 3, characterized in that: The front end of the pressure regulating screw extending into the valve body is a conical surface, and the pressure regulating screw contacts the spring gasket through the conical surface.

5. The adjustable pressure piston type pressure reducing valve according to claim 4, characterized in that: The taper of the conical surface is 90 degrees.

6. The adjustable pressure piston type pressure reducing valve according to claim 5, characterized in that: The spring washer is V-shaped or flat-plate-shaped.

7. The adjustable pressure piston pressure reducing valve according to claim 6, characterized in that: The valve body at one end of the spring gasket disposed in the piston chamber is provided with a gasket fulcrum, and the spring gasket touches the gasket fulcrum under the compression of the piston spring.

8. The adjustable pressure piston type pressure reducing valve according to claim 7, characterized in that: An outward end of the air intake passage is connected with an air intake rod and an air intake nut.

9. The adjustable pressure piston pressure reducing valve according to claim 8, characterized in that: The valve body is also provided with a pressure gauge, which is communicated with the pressure reducing hole through a pipeline.

10. The 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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