A filter pressure reducing valve

Abstract

The present invention discloses a novel filtering pressure reducing valve, comprising a valve cover, a valve body and a water cup which are sequentially connected from top to bottom, the valve body being provided with an air inlet and an air outlet which are respectively connected to the outside, a ventilation and pressure stabilizing mechanism which is connected to the air inlet and the air outlet is installed between the valve cover and the valve body, a gas-liquid separation mechanism is installed at the lower end of the valve body and the upper end which is located in the water cup, an automatic liquid discharge mechanism is installed through the bottom of the water cup, after gas enters through the air inlet, impurity water is separated by the gas-liquid separation mechanism, and then dynamic balance is achieved under the action of the ventilation and pressure stabilizing mechanism, thereby maintaining the purpose of keeping the rear end pressure constant; the automatic liquid discharge mechanism automatically and instantaneously discharges water when the water volume in the water cup reaches a certain volume, and the structure is simple, easy to implement, low in cost and high in reliability.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a novel filtering pressure reducing valve. Background Art

[0002] In the process industry automation control area, pneumatic precision instruments are widely used, which have high requirements on gas source. The pressure stability of gas source directly affects the accuracy of the instrument, and the impurities and moisture in the gas source directly affect the life of the instrument.

[0003] Therefore, those skilled in the art are committed to developing a new type of filter pressure reducing valve that can better remove gas moisture and ensure that the pressure at the front end of the instrument is constant and controllable. Summary of the invention

[0004] In view of the above-mentioned defects of the prior art, the technical problem to be solved by the present invention is to provide a new type of filter pressure reducing valve which will not damage the outer surface of the cylinder.

[0005] To achieve the above-mentioned purpose, the present invention provides a new type of filtering pressure reducing valve, comprising a valve cover, a valve body and a water cup connected in sequence from top to bottom, the valve body being provided with an air inlet and an air outlet respectively connected to the outside, a ventilation and pressure stabilizing mechanism connected to the air inlet and the air outlet being installed between the valve cover and the valve body, a gas-liquid separation mechanism being installed at the lower end of the valve body and at the upper end located in the water cup, and an automatic liquid discharge mechanism being installed through the bottom of the water cup.

[0006] The ventilation and pressure stabilizing mechanism comprises a first spring axially mounted on the axis of the valve cover, an elastic diaphragm is sandwiched between the valve cover and the valve body, the first spring is axially sandwiched and mounted between the top of the valve cover and the elastic diaphragm, and the elastic diaphragm isolates the internal space of the valve cover from the internal space of the valve body;

[0007] The axial center of the valve body is provided with a pressure-stabilizing ventilation pipe whose upper end is connected with the air outlet, and the axial center of the pressure-stabilizing ventilation pipe is provided with a push rod which axially abuts against the bottom of the elastic diaphragm and can move up and down, the lower end of the pressure-stabilizing ventilation pipe is sleeved with the upper end of a central connecting sleeve, and the axial center of the central connecting sleeve is provided with a valve core fixedly connected with the bottom end of the push rod, the top of the valve core is provided with a sealing ring extending radially outward, and the middle side wall of the upper end of the central connecting sleeve is provided with an air vent connected with the air inlet, and the air vent is opposite to the sealing ring. When the filter pressure reducing valve is not ventilated, the top of the sealing ring is higher than or flush with the top of the air hole, and the air hole is not connected to the pressure-stabilizing air pipe; when the novel filter pressure reducing valve is ventilated, the top of the sealing ring is lower than the top of the air hole, and the air hole is connected to the pressure-stabilizing air pipe; an axial second spring is installed in the valve core, and the second spring is clamped between the valve core and the central connecting sleeve; a piston cavity is arranged between the elastic diaphragm and the valve body, and a feedback air pipe is penetrated at one end of the air outlet close to the piston cavity;

[0008] The upper end of the central connecting sleeve is integrally provided with a diverter ring extending radially outward, the gas-liquid separation mechanism includes a cyclone blade arranged on the surface of the diverter ring and close to the inner wall of the water cup, and the bottom of the central connecting sleeve is fixedly connected with a water baffle extending radially outward, and the edge of the water baffle close to the inner wall of the water cup is provided with a water leakage hole;

[0009] The closure of the valve body is of the type that is fixedly mounted on the bottom of the water cup and of a drain sleeve, the drain sleeve being installed through the bottom of the water cup, the drain sleeve being internally mounted with a drain piston that extends into the lower end of the valve pipe and can move up and down, the upper end of the valve pipe being externally mounted with a float, the upper end of the valve pipe being provided with an axial first air hole, the upper end of the valve pipe being provided with a pressure block that can cover the first air hole, the pressure block being fixedly connected with a control rod, the end of the control rod being connected with the top of the float at a distance from the pressure block, the second air hole that is connected with the first air hole being provided at the axial bottom of the drain sleeve, the top of the drain sleeve being provided with a plurality of support columns that extend upward and are arranged circumferentially, the outer side wall of the support column being provided with a fixing block that extends radially outward, the lower end of the first water permeable hole clamps the The fixing block; the lower end of the air valve tube is sleeved on the supporting column, and the lower end side wall of the air valve tube is also penetrated by a first water permeable hole, and a second water permeable hole is arranged between two adjacent supporting columns, and a sealing ring extending radially inward is arranged in the middle of the drainage sleeve, and a first sealing rubber ring which can resist the sealing ring is sleeved in the middle of the drainage piston; a third spring is installed on the axis of the drainage piston, and the third spring is clamped between the middle part of the air valve tube and the bottom of the drainage piston, and a water flow channel which can communicate with the outside world is formed between the middle inner wall of the drainage sleeve and the middle outer wall of the drainage piston, when the water is not drained, the first sealing rubber ring resists and seals the sealing ring, and when the water is drained, the first sealing rubber ring is separated from the sealing ring, and the inside of the water cup is connected with the outside world through the first water permeable hole, the second water permeable hole and the water flow channel.

[0010] The valve core is provided with a spring accommodating chamber for accommodating the second spring, the bottom of the central connecting sleeve is provided with a pressure-stabilizing chamber connected with the spring accommodating chamber, the top of the valve core is provided with a penetrating air-permeable pressure-stabilizing hole, and the pressure-stabilizing vent pipe is connected with the spring accommodating chamber and the pressure-stabilizing chamber through the air-permeable pressure-stabilizing hole.

[0011] The top of the water baffle extends upward and is integrally provided with a fixing sleeve that is sleeved on the bottom of the central connecting sleeve. The middle part of the fixing sleeve extends radially outward to provide a filter cartridge fixing seat. An axially extending filter cartridge is installed between the rear end of the diverter ring and the filter cartridge fixing seat, and the filter cartridge covers the air vent.

[0012] The valve cover is also covered with a rotary cover, the top axis of the valve cover is provided with an internal thread, the internal thread is threadedly connected with an adjusting screw, the top of the adjusting screw is provided with a rotation-stopping portion, and the top of the rotary cover is provided with a rotation-stopping groove matching the rotation-stopping portion;

[0013] The middle part of the adjusting screw is fixedly connected with a spring lower pressure seat, the middle part of the elastic diaphragm is opened and is mounted on an air resistance block, an air resistance pad is installed at the bottom end of the axis of the air resistance block, and coaxial pressure relief holes are provided through the air resistance block and the air resistance pad, a spring fixing plate is installed at the upper end of the air resistance block, and the first spring is axially clamped between the spring fixing plate and the spring lower pressure seat; the axis of the air resistance block is also sleeved with a spring retaining ring and a buffer plate pressed on the elastic diaphragm.

[0014] A pressure gauge connected to the pressure-stabilizing ventilation pipe is also installed in one side of the valve body; a fixing nut and an external connecting nut are also installed from top to bottom at the bottom of the water cup.

[0015] The water cup is covered with a metal cover, and the metal cover is also provided with a hollow observation window. A disassembly and assembly switch mechanism is also installed between the valve body and the metal cover. The metal cover is integrally provided with a guide plate extending upward. The disassembly and assembly switch mechanism includes a slider installed on the guide plate and movable up and down. The guide plate is penetrated by a slide groove, and the slider is provided with a limiting column inserted into the slide groove. The slider is hollow inside and is provided with a fourth spring, which is clamped between the top of the guide plate and the top of the slider. The top of the slider is provided with a pad embedded between the outer wall of the metal cover and the inner wall of the bottom end of the valve body.

[0016] The upper outer wall of the valve cover is provided with a first shift groove and a second shift groove arranged in vertical order, and the rotary cover is provided with a shift tooth which can be embedded in the first shift groove or the second shift groove; the top of the valve cover is provided with a plurality of positioning grooves arranged in a ring shape, and the inner side of the top of the rotary cover is provided with a positioning tooth which can be embedded in the positioning groove; the outer wall of the valve cover is located below the first shift groove and the second shift groove and is sleeved with an indicator ring.

[0017] The upper end of the push rod is also sleeved with a C-shaped ring, and the upper end of the push rod is also sleeved with a second sealing rubber ring; the lower end of the valve core is sleeved with a third sealing rubber ring; the lower end of the valve body is also sleeved with a fourth sealing rubber ring, the middle part of the drain sleeve is also sleeved with a fifth sealing rubber ring, the upper end of the drain piston is also sleeved with a sixth sealing rubber ring, and the bottom end of the air valve pipe is also sleeved with a retaining ring.

[0018] The end of the control rod away from the pressure block is fixedly connected to the top of the float through a supporting plate; a pressure block rubber pad is installed on the bottom axis of the pressure block, and the pressure block rubber pad covers the first air vent; a radially outwardly protruding resting platform is provided in the middle of the air valve pipe, and an upwardly protruding resting protrusion is provided on the top of the resting platform, and the middle of the float rests on the resting protrusion.

[0019] The beneficial effects of the present invention are as follows: the new type of filtering pressure reducing valve of the present invention comprises a valve cover, a valve body and a water cup which are sequentially connected from top to bottom, the valve body is provided with an air inlet and an air outlet which are respectively connected to the outside, a ventilation and pressure stabilizing mechanism which is connected to the air inlet and the air outlet is installed between the valve cover and the valve body, a gas-liquid separation mechanism is installed at the lower end of the valve body and the upper end which is located in the water cup, an automatic liquid discharge mechanism is installed through the bottom of the water cup, after the gas enters through the air inlet, the impurity water is separated by the gas-liquid separation mechanism, and then a dynamic balance is achieved under the action of the ventilation and pressure stabilizing mechanism, thereby maintaining the purpose of keeping the rear end pressure constant; the automatic liquid discharge mechanism automatically discharges the water instantaneously when the water volume in the water cup reaches a certain volume, and the structure is simple, easy to implement, low cost and high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 It is a top view of the structure of the present invention;

[0022] Figure 3 yes Figure 2 Structural cross-section view at AA in the middle;

[0023] Figure 4 yes Figure 3 A schematic diagram of the structure enlargement in the middle;

[0024] Figure 5 1. It is a schematic diagram of the drainage state of the automatic drainage mechanism;

[0025] Figure 6 This is a schematic diagram of the automatic drainage mechanism in the closed state

[0026] Figure 7 It is a partial structural exploded view of the present invention;

[0027] Figure 8 It is a schematic diagram of the structure of the drainage sleeve of the present invention;

[0028] Fig. 9 It is a structural schematic diagram of the valve core of the present invention. DETAILED DESCRIPTION

[0029] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific manner, and therefore cannot be understood as limiting the present invention. The terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0030] like Figures 1 to 9 As shown, a new type of filtering pressure reducing valve comprises a valve cover 1, a valve body 2 and a water cup 3 connected in sequence from top to bottom, the valve body 2 is provided with an air inlet 4 and an air outlet 5 respectively connected to the outside, a ventilation and pressure stabilizing mechanism connected to the air inlet 4 and the air outlet 5 is installed between the valve cover 1 and the valve body 2, a gas-liquid separation mechanism is installed at the lower end of the valve body 2 and the upper end located in the water cup 3, an automatic liquid discharge mechanism is installed through the bottom of the water cup 3, after the gas enters through the air inlet, the impurity water is separated by the gas-liquid separation mechanism, and then dynamic balance is achieved under the action of the ventilation and pressure stabilizing mechanism, thereby maintaining the purpose of keeping the rear end pressure constant; the automatic liquid discharge mechanism automatically discharges the water instantly when the water volume in the water cup reaches a certain volume, and the structure is simple, easy to implement, low cost and high reliability.

[0031] In this embodiment, the ventilation and pressure-stabilizing mechanism includes a first spring 6 axially installed on the axis of the valve cover 1, an elastic diaphragm 7 is clamped between the valve cover 1 and the valve body 2, and the first spring 6 is axially clamped and installed between the top of the valve cover 1 and the elastic diaphragm 7, and the elastic diaphragm 7 isolates the internal space of the valve cover 1 from the internal space of the valve body 2.

[0032] The axis of the valve body 2 is provided with a pressure-stabilizing ventilation pipe 8 connected with the upper end of the outlet 4, and the axis of the pressure-stabilizing ventilation pipe 8 is installed with a push rod 9 axially against the bottom of the elastic diaphragm 7 and movable up and down, the lower end of the pressure-stabilizing ventilation pipe 8 is sleeved with the upper end of a central connecting sleeve 10, and the axis of the central connecting sleeve 10 is installed with a valve core 11 fixedly connected to the bottom end of the push rod 9, and the top of the valve core 11 is provided with a sealing ring 16 extending radially outward, and the middle side wall of the upper end of the central connecting sleeve 10 is provided with an air vent 17 connected with the air inlet 4, and the air vent 17 is opposite to the sealing ring 16. When the pressure reducing valve is not ventilated, the top of the sealing ring 16 is higher than or flush with the top of the air hole 17, and the air hole 17 is not connected to the pressure-stabilizing ventilation pipe 8; when the new filter pressure reducing valve is ventilated, the top of the sealing ring 16 is lower than the top of the air hole 17, and the air hole 17 is connected to the pressure-stabilizing ventilation pipe 8; an axial second spring 18 is installed in the valve core 11, and the second spring 18 is clamped between the valve core 11 and the center connecting sleeve 10; a piston cavity 78 is arranged between the elastic diaphragm 7 and the valve body 2, and a feedback air pipe 79 is penetrated by one end of the air outlet 5 close to the piston cavity 78.

[0033] The upper end of the central connecting sleeve 10 is integrally provided with a diverter ring 12 extending radially outward, the gas-liquid separation mechanism includes a cyclone blade 13 arranged on the surface of the diverter ring 12 and close to the inner wall of the water cup 3, and the bottom of the central connecting sleeve 10 is fixedly connected to a water baffle plate 14 extending radially outward, and the edge of the water baffle plate 14 close to the inner wall of the water cup 3 is provided with a water leakage hole 15.

[0034] The automatic drainage mechanism includes an air valve tube 19 and a drainage sleeve 20 which are fixedly mounted on the bottom of the water cup 3 in an upper and lower stacked manner. The drainage sleeve 20 is installed through the bottom of the water cup 3. A drainage piston 21 which extends into the lower end of the air valve tube 19 and can move up and down is installed in the drainage sleeve 20. A floating body 22 is connected to the outer sleeve of the upper end of the air valve tube 19. The upper end of the air valve tube 19 is provided with an axial first air hole 23. The upper end of the air valve tube 19 is also provided with a valve that can cover the first air hole. The pressure block 23 is fixedly connected to the pressure block 24 with a control rod 25, and one end of the control rod 25 away from the pressure block 24 is connected to the top of the float 22. The axial bottom of the drainage sleeve 20 is provided with a second air hole 26 connected to the first air hole 23. The top of the drainage sleeve 20 is provided with a plurality of support columns 27 extending upward and arranged circumferentially. The outer side wall of the support column 27 is also provided with a fixed block 73 extending radially outward. The lower end of the first water-permeable hole 28 is clamped by the housing. The fixing block 73; the lower end of the air valve pipe 19 is sleeved on the support column 27, and the lower end side wall of the air valve pipe 19 is also penetrated with a first water permeable hole 28, and a second water permeable hole 29 is provided between two adjacent support columns 27. The middle part of the drainage sleeve 20 is provided with a sealing ring 30 extending radially inward, and the middle part of the drainage piston 21 is sleeved with a first sealing rubber ring 31 that can resist the sealing ring 30; the axis of the drainage piston 21 is installed with a third spring 32, and the third spring 3 2 is clamped between the middle of the air valve pipe 19 and the bottom of the drainage piston 21, and a water flow channel 55 that can communicate with the outside is formed between the middle inner wall of the drainage sleeve 20 and the middle outer wall of the drainage piston 21. When the water is not drained, the first sealing rubber ring 31 contacts and seals the sealing ring 30. When the water is drained, the first sealing rubber ring 31 is separated from the sealing ring 30, and the interior of the water cup 3 is connected with the outside through the first water permeable hole 28, the second water permeable hole 29 and the water flow channel 55.

[0035] The valve core 11 is provided with a spring accommodating chamber 33 for accommodating the second spring 18, the bottom of the central connecting sleeve 10 is provided with a pressure-stabilizing chamber 34 connected with the spring accommodating chamber 33, the top of the valve core 11 is provided with a penetrating air-permeable pressure-stabilizing hole 35, the pressure-stabilizing vent pipe 8 is connected with the spring accommodating chamber 33 and the pressure-stabilizing chamber 34 through the air-permeable pressure-stabilizing hole 35, and the spring accommodating chamber 33 further plays a pressure-stabilizing role through the air-permeable pressure-stabilizing hole 35.

[0036] The top of the water baffle 14 extends upward and is integrally provided with a fixing sleeve 36 that is sleeved on the bottom of the center connecting sleeve 10. The middle part of the fixing sleeve 36 extends radially outward to provide a filter cartridge fixing seat 37. An axially extending filter cartridge 38 is installed between the rear end of the diverter ring 12 and the filter cartridge fixing seat 37. The filter cartridge 38 covers the air vent 17.

[0037] The valve cover 1 is also covered with a screw cover 39 , the top axis of the valve cover 1 is provided with an internal thread, the internal thread is threadedly connected with an adjusting screw 40 , the top of the adjusting screw 40 is provided with a stopper 41 , and the top of the screw cover 39 is provided with a stopper groove matching the stopper 41 .

[0038] A spring pressure seat 45 is fixedly connected to the middle part of the adjusting screw 40, a hole is opened in the middle part of the elastic diaphragm 7 and is mounted on an air resistance block 42, an air resistance pad 43 is installed at the bottom end of the axis of the air resistance block 42, and a coaxial pressure relief hole 44 is provided through the air resistance block 42 and the air resistance pad 43, a spring fixing plate 46 is installed at the upper end of the air resistance block 42, and the first spring 6 is axially clamped between the spring fixing plate 46 and the spring pressure seat 45; the axis of the air resistance block 42 is also sleeved with a spring retaining ring 80 and a buffer plate 81 pressed on the elastic diaphragm 7, the function of the spring retaining ring 80 and the buffer plate 81 is to prevent the first spring 6 from directly pressing on the elastic diaphragm 7, thereby extending the service life of the elastic diaphragm 7.

[0039] A pressure gauge 47 connected to the pressure-stabilizing vent pipe 8 is also installed in one side of the valve body 2; a fixing nut 64 and an external connection nut 65 are also installed from top to bottom at the bottom of the water cup 3 to facilitate external piping.

[0040] The water cup 3 is covered with a metal cover 48, and the metal cover 48 is also provided with a hollow observation window 49. A disassembly and assembly switch mechanism is also installed between the valve body 2 and the metal cover 48. The metal cover 48 is integrally provided with a guide plate 67 extending upward. The disassembly and assembly switch mechanism includes a slider 68 installed on the guide plate 67 and movable up and down. The guide plate 67 is penetrated by a slide groove 69. The slider 68 is provided with a limiting column 70 inserted into the slide groove 69. The slider 68 is hollow inside and is provided with a fourth spring 71. The fourth spring 71 is clamped between the top of the guide plate 67 and the top of the slider 68. The top of the slider 68 is provided with a pad 72 embedded between the outer wall of the metal cover 48 and the inner wall of the bottom end of the valve body 2.

[0041] The upper outer wall of the valve cover 1 is provided with a first shift groove 50 and a second shift groove 51 arranged in vertical order, and the rotary cover 39 is provided with a shift tooth 52 which can be embedded in the first shift groove 50 or the second shift groove 50; the top of the valve cover 1 is provided with a plurality of positioning grooves 53 arranged in a ring shape, and the inner side of the top of the rotary cover 39 is provided with a positioning tooth 54 which can be embedded in the positioning groove 53; the outer wall of the valve cover 1 is located below the first shift groove 50 and the second shift groove 51 and is sleeved with an indicator ring 56, which indicates which gear position is in. When the shift tooth 52 is embedded in the first shift groove 50, it indicates that the rotary cover 39 can be rotated, and the indicator ring 56 is exposed at this time; when the shift tooth 52 is embedded in the second shift groove 51, the indicator ring 56 is concealed, and the positioning tooth 54 is embedded in the positioning groove 53, and the rotary cover 39 cannot be rotated at this time.

[0042] The upper end of the push rod 9 is also sleeved with a C-shaped ring 57, and the upper end of the push rod 9 is also sleeved with a second sealing rubber ring 58; the lower end of the valve core 11 is sleeved with a third sealing rubber ring 59; the lower end of the valve body 2 is also sleeved with a fourth sealing rubber ring 60, the middle part of the drainage sleeve 20 is also sleeved with a fifth sealing rubber ring 61, the upper end of the drainage piston 21 is also sleeved with a sixth sealing rubber ring 62, and the bottom end of the air valve pipe 19 is also sleeved with a retaining ring 63. The structure is simple and the sealing is good.

[0043] The end of the control rod 25 away from the pressure block 24 is fixedly connected to the top of the float 22 through a support plate 74; a pressure block rubber pad 75 is installed on the bottom axis of the pressure block 24, and the pressure block rubber pad 75 covers the first air vent 23; a radially outwardly protruding resting platform 76 is provided in the middle of the air valve tube 19, and an upwardly protruding resting protrusion 77 is provided on the top of the resting platform 76, and the middle of the float 22 is rested on the resting protrusion 77, which has a simple structure, a small contact area between the float 22 and the air valve tube 19, and will not adhere to each other under the action of moisture, and the float 22 has high sensitivity.

[0044] The working principle of the present invention is:

[0045] Reference Figure 3, the gas enters the valve body 2 from the air inlet 4 and then flows downward. The arrow indicates the flow direction. When passing through the cyclone blades 13, the gas is changed in flow direction by the cyclone blades 13, that is, it spirally flows downward along the inner wall of the water cup 3. The centrifugal force generated in this process separates the impurities and moisture contained in the gas. The impurities and moisture pass through the leaking holes 15 and flow downward along the inner wall of the water cup 3, and the remaining gas is filtered by the filter cartridge 38. Twist the screw cap 39 to push the adjusting screw 40 to spirally rotate downward, thereby pushing the elastic diaphragm 7 downward, and then pushing the air resistance block 42 and the air valve pipe 19 to move downward. At this time, the valve core 11 drives the sealing ring 16 to move downward. The top of the sealing ring 16 is lower than the top of the air vent 17. The air vent 17 is connected to the pressure-stabilizing vent pipe 8, and the filtered gas is discharged from The air flows through the air vent 17 through the pressure-stabilizing vent pipe 8 and finally flows out from the air outlet 5. During this period, the pressure gauge 47 constantly monitors and displays the air pressure inside the pressure-stabilizing vent pipe 8, so the size of the opening of the air vent 17 can be adjusted by adjusting the screw cap 39, thereby adjusting the gas flow rate. The first spring 6 and the second spring 18 work together from the upper and lower directions to maintain the constancy of the internal space of the pressure-stabilizing vent pipe 8, thereby stabilizing the pressure of the output gas; when the device needs to be closed and not ventilated, the screw cap 39 is twisted, and the elastic diaphragm 7 moves upward instantly, and the excess gas is discharged from the pressure relief hole 44. Then, under the elastic recovery action of the second spring 18, the valve core 11 moves upward, and the top of the sealing ring 16 is higher than or flush with the top of the air vent 17. The air vent 17 is not connected to the pressure-stabilizing vent pipe 8, and ventilation is impossible at this time.

[0046] When the water in the water cup 3 accumulates enough and reaches a certain volume, the buoyancy generated by the water pushes the float 22 upward, thereby pushing the support sheet 74, the control rod 25, the pressing block 24 and the pressing block rubber pad 75 upward, the first air hole 23 opens, and part of the gas in the water cup 3 enters the inside of the air valve tube 19 through the first air hole 23. The air pressure and the third spring 32 push the drainage piston 21 downward, so that the first sealing rubber ring 31 is separated from the sealing ring 30, and the inside of the water cup 3 is connected to the outside through the first water permeable hole 28, the second water permeable hole 29 and the water flow channel 55. The water in the water cup 3 is quickly discharged through the first water permeable hole 28, the second water permeable hole 29 and the water flow channel 55. Figure 5 , the arrow indicates the direction of water flow; when the water is drained, the float 22 sinks, and the first air hole 23 is closed. Due to the negative pressure near the first air hole 23, external gas enters the drainage piston 21 through the second air hole 26, pushing the drainage piston 21 upward, so that the first sealing rubber ring 31 contacts the sealing ring 30, and the seal is good. The automatic drainage mechanism separates the water path and the air path, and uses gas to control the drainage. The structure is ingenious, the water flow and the air flow will not interfere with each other, the drainage speed is fast, the cost is low, and the reliability is high.

[0047] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A filter pressure reducing valve, comprising a valve cover (1), a valve body (2) and a water cup (3) connected in sequence from top to bottom, wherein the valve body (2) is provided with an air inlet (4) and an air outlet (5) respectively connected to the outside, and characterized in that: A ventilation and pressure stabilizing mechanism connected to the air inlet (4) and the air outlet (5) is installed between the valve cover (1) and the valve body (2); a gas-liquid separation mechanism is installed at the lower end of the valve body (2) and at the upper end located in the water cup (3); and an automatic liquid discharge mechanism is installed through the bottom of the water cup (3); The ventilation pressure stabilizing mechanism comprises a first spring (6) axially mounted on the axis of the valve cover (1), an elastic diaphragm (7) is clamped between the valve cover (1) and the valve body (2), the first spring (6) is axially clamped and mounted between the top of the valve cover (1) and the elastic diaphragm (7), and the elastic diaphragm (7) isolates the internal space of the valve cover (1) from the internal space of the valve body (2); The axis of the valve body (2) is provided with a pressure-stabilizing ventilation pipe (8) whose upper end is connected to the air outlet (5), and the axis of the pressure-stabilizing ventilation pipe (8) is installed with a push rod (9) which axially abuts against the bottom of the elastic diaphragm (7) and can move up and down. The lower end of the pressure-stabilizing ventilation pipe (8) is sleeved with the upper end of a central connecting sleeve (10), and the axis of the central connecting sleeve (10) is installed with a valve core (11) fixedly connected to the bottom end of the push rod (9), and the top of the valve core (11) is provided with a sealing ring (16) extending radially outward, and the middle side wall of the upper end of the central connecting sleeve (10) is provided with an air vent (17) connected to the air inlet (4), and the air vent (17) is opposite to the sealing ring (16). When the filter decompression When the valve is not ventilated, the top of the sealing ring (16) is higher than or flush with the top of the air hole (17), and the air hole (17) is not connected to the pressure-stabilizing ventilation pipe (8); when the filter pressure reducing valve is ventilated, the top of the sealing ring (16) is lower than the top of the air hole (17), and the air hole (17) is connected to the pressure-stabilizing ventilation pipe (8); an axial second spring (18) is installed in the valve core (11), and the second spring (18) is clamped between the valve core (11) and the central connecting sleeve (10); a piston chamber (78) is provided between the elastic diaphragm (7) and the valve body (2), and a feedback air pipe (79) is provided through one end of the air outlet (5) close to the piston chamber (78); The upper end of the central connecting sleeve (10) is integrally provided with a flow divider ring (12) extending radially outward, the gas-liquid separation mechanism comprises a cyclone blade (13) arranged on the surface of the flow divider ring (12) and close to the inner wall of the water cup (3), the bottom of the central connecting sleeve (10) is fixedly connected with a water baffle plate (14) extending radially outward, and the edge of the water baffle plate (14) close to the inner wall of the water cup (3) is provided with a water leakage hole (15); The automatic drainage mechanism comprises an air valve tube (19) and a drainage sleeve (20) which are fixedly mounted on the bottom of the water cup (3) in a stacked manner. The drainage sleeve (20) is installed through the bottom of the water cup (3). A drainage piston (21) which extends into the lower end of the air valve tube (19) and can move up and down is installed in the drainage sleeve (20). A floating body (22) is installed outside the upper end of the air valve tube (19). The upper end of the air valve tube (19) is provided with an axial first air hole (23). The upper end of the air valve tube (19) is also provided with a cap which can cover the first air hole (23). 3) a pressure block (24), the pressure block (24) is fixedly connected to a control rod (25), one end of the control rod (25) away from the pressure block (24) is connected to the top of the float (22), the axial bottom of the drainage sleeve (20) is provided with a second air hole (26) connected to the first air hole (23), the top of the drainage sleeve (20) is provided with a plurality of support columns (27) extending upward and arranged circumferentially, the outer side wall of the support column (27) is also provided with a fixed block (73) extending radially outward, the lower end of the air valve pipe (19) is sleeved on the On the support column (27), a first water-permeable hole (28) is also provided through the side wall of the lower end of the air valve pipe (19), and the lower end of the first water-permeable hole (28) clamps the fixing block (73); a second water-permeable hole (29) is provided between two adjacent support columns (27); a sealing ring (30) extending radially inward is provided in the middle of the drainage sleeve (20), and a first sealing rubber ring (31) that can abut against the sealing ring (30) is sleeved in the middle of the drainage piston (21); a third spring (32) is installed on the axis of the drainage piston (21), and the third spring ( 32) is clamped between the middle of the air valve tube (19) and the bottom of the drainage piston (21), and a water flow channel (55) that can communicate with the outside is formed between the middle inner wall of the drainage sleeve (20) and the middle outer wall of the drainage piston (21). When the drainage is not carried out, the first sealing rubber ring (31) contacts and seals the sealing ring (30). When the drainage is carried out, the first sealing rubber ring (31) is separated from the sealing ring (30), and the interior of the water cup (3) is communicated with the outside through the first water permeable hole (28), the second water permeable hole (29) and the water flow channel (55); The valve core (11) is provided with a spring accommodating chamber (33) for accommodating the second spring (18); the bottom of the central connecting sleeve (10) is provided with a pressure stabilizing chamber (34) communicating with the spring accommodating chamber (33); the top of the valve core (11) is provided with a penetrating air-permeable pressure-stabilizing hole (35); the pressure-stabilizing vent pipe (8) is communicated with the spring accommodating chamber (33) and the pressure-stabilizing chamber (34) through the air-permeable pressure-stabilizing hole (35); The top of the water baffle (14) extends upward and is integrally provided with a fixing sleeve (36) sleeved on the bottom of the central connecting sleeve (10); a filter cartridge fixing seat (37) is radially extended outward from the middle of the fixing sleeve (36); an axially extending filter cartridge (38) is installed between the rear end of the diverter ring (12) and the filter cartridge fixing seat (37); the filter cartridge (38) covers the air vent (17).

2. The filter pressure reducing valve according to claim 1, characterized in that: The valve cover (1) is also covered with a screw cap (39), the top axis of the valve cover (1) is provided with an internal thread, the internal thread is threadedly connected to an adjusting screw (40), the top of the adjusting screw (40) is provided with a rotation-stopping portion (41), and the top of the screw cap (39) is provided with a rotation-stopping groove matching the rotation-stopping portion (41); The middle of the adjusting screw (40) is fixedly connected to a spring lower pressure seat (45); the middle of the elastic diaphragm (7) is opened and sleeved on an air resistance block (42); the lower end of the axis of the air resistance block (42) is installed with an air resistance pad (43); the air resistance block (42) and the air resistance pad (43) are penetrated by coaxial pressure relief holes (44); the upper end of the air resistance block (42) is installed with a spring fixing plate (46); the first spring (6) is axially clamped between the spring fixing plate (46) and the spring lower pressure seat (45); the axis of the air resistance block (42) is also sleeved with a spring retaining ring (80) and a buffer plate (81) pressed on the elastic diaphragm (7).

3. The filter pressure reducing valve according to claim 1, characterized in that: A pressure gauge (47) connected to the pressure-stabilizing vent pipe (8) is also installed on one side of the valve body (2); a fixing nut (64) and an external connection nut (65) are also installed on the bottom end of the water cup (3) from top to bottom.

4. The filter pressure reducing valve according to claim 2, characterized in that: The water cup (3) is covered with a metal cover (48), and the metal cover (48) is also provided with a hollow observation window (49). A disassembly switch mechanism is also installed between the valve body (2) and the metal cover (48). The metal cover (48) is integrally provided with a guide plate (67) extending upward. The disassembly switch mechanism includes a slider (68) installed on the guide plate (67) and movable up and down. The guide plate (67) is provided with a slide groove (69) running through it. The slider (68) is provided with a limit column (70) inserted into the slide groove (69). The slider (68) is hollow inside and is provided with a fourth spring (71). The fourth spring (71) is clamped between the top end of the guide plate (67) and the top of the slider (68). The top of the slider (68) is provided with a pad (72) embedded between the outer side wall of the metal cover (48) and the inner side wall of the bottom end of the valve body (2).

5. The filter pressure reducing valve according to claim 4, characterized in that: The upper outer wall of the valve cover (1) is provided with a first shift groove (50) and a second shift groove (51) arranged in a vertical direction, and the rotary cover (39) is provided with a shift tooth (52) that can be embedded in the first shift groove (50) or the second shift groove (51); the top of the valve cover (1) is provided with a plurality of positioning grooves (53) arranged in a ring shape, and the inner side of the top of the rotary cover (39) is provided with a positioning tooth (54) that can be embedded in the positioning groove (53); and an indicator ring (56) is sleeved on the outer wall of the valve cover (1) below the first shift groove (50) and the second shift groove (51).

6. The filter pressure reducing valve according to claim 1, characterized in that: The upper end of the push rod (9) is also sleeved with a C-shaped ring (57), and the upper end of the push rod (9) is also sleeved with a second sealing rubber ring (58); the lower end of the valve core (11) is sleeved with a third sealing rubber ring (59); the lower end of the valve body (2) is also sleeved with a fourth sealing rubber ring (60), the middle part of the drainage sleeve (20) is also sleeved with a fifth sealing rubber ring (61), the upper end of the drainage piston (21) is also sleeved with a sixth sealing rubber ring (62), and the bottom end of the air valve pipe (19) is also sleeved with a retaining ring (63).

7. The filter pressure reducing valve according to claim 1, characterized in that: One end of the control rod (25) away from the pressure block (24) is fixedly connected to the top of the floating body (22) through a supporting plate (74); a pressure block rubber pad (75) is installed on the bottom axis of the pressure block (24), and the pressure block rubber pad (75) covers the first air vent (23); a radially outwardly protruding resting platform (76) is provided in the middle of the air valve pipe (19), and an upwardly protruding resting protrusion (77) is provided on the top of the resting platform (76), and the middle of the floating body (22) rests on the resting protrusion (77).

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