CN202493684U

CN202493684U - Diaphragm type pressure reducing valve

Info

Publication number: CN202493684U
Application number: CN2012200912121U
Authority: CN
Inventors: 李先辉; 郑波; 高飞; 汪秀勇
Original assignee: Ningbo Xingjian Space Machinery Co ltd
Current assignee: Ningbo Xingjian Space Machinery Co ltd
Priority date: 2012-03-12
Filing date: 2012-03-12
Publication date: 2012-10-17
Anticipated expiration: 2022-03-12

Abstract

The utility model relates to a diaphragm type pressure reducing valve, belonging to a pressure reducing valve. The diaphragm type pressure reducing valve comprises a valve body, a diaphragm, a guide disk, a knockout rod, a valve and a first spring, wherein the valve body comprises a lower valve body, an upper valve body and a suction flange, an induction trunk is arranged on the suction flange, an exhaust trunk is arranged on the upper valve body, and a control trunk is arranged on the lower valve body; the edge of the diaphragm is clamped between the lower valve body and the upper valve body, and an upper clamp plate and a lower clamp plate are respectively attached to the diaphragm; one end of the knockout rod is abutted against the valve, and the other end is abutted against the upper clamp plate; and a second spring is arranged between the upper clamp plate and the guide disk, and a third spring is arranged between the lower clamp plate and the lower valve body. The diaphragm type pressure reducing valve also comprises a valve seat and a gland, wherein the valve seat comprises a base disk and a cylinder, an axial through hole is arranged on the base disk, a radial through hole is arranged at the lower part on the peripheral wall of the cylinder, the lower end of the valve is provided with an annular tip part, and the annular tip part is tightly compressed on the base disk around the axial through hole. The diaphragm type pressure reducing valve provided by the utility model not only can be applied to a gas pipeline with 45 MPa gas pressure, but also has long service life.

Description

The diaphragm type reduction valve

Technical field:

The utility model relates to a kind of valving, specifically is a kind of diaphragm type reduction valve that is installed on the gas pipeline.

Background technique:

The diaphragm type reduction valve is a kind of valving that will get into its inner high pressure air reducing to a certain stabilizing low voltage gas.Generally all be provided with gas-entered passageway, outlet passageway and control channel on the valve body of existing diaphragm type reduction valve; The valve that is provided with between gas-entered passageway and the outlet passageway is used to control the break-make of gas-entered passageway and outlet passageway; The diaphragm that is arranged between outlet passageway and the control channel is used for promoting valve so that valve is opened, and closing of valve then is to rely on to withstand on from the spring of body to realize, after valve is closed; Valve can be pressed on the seal face in the body cavity under the effect of spring force; In order to prevent gas leakage, seal washer generally all is housed on the valve seals, seal washer is processed by the polychlorotrifluoroethylene material usually.The diaphragm type reduction valve of this soft sealing structure of above-mentioned employing seal washer generally can only be used in the gas pipeline of inlet pressure less than 35MPa; If after being contained in it on gas pipeline that gas pressure is 45MPa; The pressure that seal washer bears is bigger; Very easily take place to wear out, thereby shorten the working life of diaphragm type reduction valve greatly.

The model utility content:

The technical problem that the utility model will solve is provide a kind of and not only can be applied on the gas pipeline that gas pressure is 45MPa, and working life to be than long diaphragm type reduction valve.

The technical solution of the utility model is that a kind of diaphragm type reduction valve with following structure is provided: comprise valve body, diaphragm, positioning disk, push rod, valve and first spring, valve body comprises following valve body, the suction flange that is connected down the upper valve body at valve body top and is connected the upper valve body top; Suction flange is provided with gas-entered passageway, and upper valve body is provided with the outlet passageway that communicates with gas-entered passageway, and following valve body is provided with control channel; Be provided with diaphragm chamber between following valve body and the upper valve body, the diaphragm chamber top communicates with outlet passageway, and the diaphragm chamber bottom communicates with control channel; Diaphragm is clipped between valve body and the upper valve body at diaphragm chamber middle part and its edge, posts punch holder and die holder on the top surface of diaphragm and the lower surface respectively, and positioning disk is positioned at diaphragm chamber and is connected with upper valve body; Push rod is inserted on the positioning disk and can slides up and down along positioning disk, and an end of push rod withstands on the valve, and the push rod the other end withstands on the punch holder; Be provided with second spring between punch holder and the positioning disk, be provided with the 3rd spring between die holder and the following valve body, wherein; Also comprise the valve base and the gland that are positioned at gas-entered passageway; Valve base is made up of chassis and the cylinder that is positioned at the top, chassis, and the chassis is provided with axial hole, and cylinder periphery wall bottom is provided with radial direction through hole; The chassis is connected between suction flange and the upper valve body; Gland is connected the cylinder top, and valve is arranged in cylinder bore and its top can slide up and down at the gland inner chamber, and first spring withstands between gland and the valve; The valve lower end is provided with annular tip, and annular tip is pressed on the chassis of axial hole periphery.

The described diaphragm type reduction valve of the utility model wherein, is connected with safety valve on the upper valve body, the safety valve open top is used for communicating with control channel, and the bottom opening of safety valve communicates with outlet passageway.

After adopting above structure; Compared with prior art; The utility model diaphragm type reduction valve has the following advantages: that this soft seal of seal washer is installed on valve is different with existing technology diaphragm type reduction valve; The valve lower end of the utility model diaphragm type reduction valve is provided with annular tip, and annular tip is pressed on the chassis of axial hole periphery, in other words; The utility model diaphragm type reduction valve adopt annular tip directly and the chassis be close to incompatible the sealing; Being sealed in that this metal and metal are directly fitted is referred to as hard sealing on the industry, the employing of hard sealing not only can make the utility model diaphragm type reduction valve can be contained on the gas pipeline that gas pressure is 45MPa, and avoided seal washer because of the aging diaphragm type reduction valve problem in working life that shortens takes place.

Description of drawings:

Fig. 1 is the sectional structure chart of the utility model diaphragm type reduction valve;

Fig. 2 is the amplification assumption diagram of analysing and observe of valve among Fig. 1, first spring, gland, valve base and push rod part.

Embodiment:

Below in conjunction with accompanying drawing and embodiment the utility model diaphragm type reduction valve is done further explain:

As depicted in figs. 1 and 2, in this embodiment, the utility model diaphragm type reduction valve comprises valve body, diaphragm 13, positioning disk 10, push rod 11, valve 5, first spring 22, valve base and gland 2; Valve body comprises following valve body 14, the suction flange 1 that is connected down the upper valve body 19 at valve body 14 tops and is connected upper valve body 19 tops, and suction flange 1 is provided with gas-entered passageway 3, and upper valve body 19 is provided with the outlet passageway 18 that communicates with gas-entered passageway 3; Following valve body 14 is provided with control channel 17, is provided with diaphragm chamber 15 between following valve body 14 and the upper valve body 19, and diaphragm chamber 15 tops communicate with outlet passageway 18; Diaphragm chamber 15 bottoms communicate with control channel 17, and diaphragm 13 is clipped in down between the valve body 14 and upper valve body 19 in diaphragm chamber 15 middle parts and its edge, posts punch holder 8 and die holder 9 on the top surface of diaphragm 13 and the lower surface respectively; Positioning disk 10 is positioned at diaphragm chamber 15 and is connected through screw with upper valve body 19, and push rod 11 is inserted on the positioning disk 10 and can slides up and down along positioning disk 10, and an end of push rod 11 withstands on the valve 5; Push rod 11 the other ends withstand on the punch holder 8; Be provided with second spring 16 between punch holder 8 and the positioning disk 10, be provided with the 3rd spring 12 between die holder 9 and the following valve body 14, valve base and gland 2 are positioned at gas-entered passageway 3; Valve base is made up of chassis 6 and the cylinder 4 that is positioned at 6 tops, chassis; Chassis 6 is provided with axial hole 20, and cylinder 4 periphery wall bottoms are provided with radial direction through hole 21, and chassis 6 is connected between suction flange 1 and the upper valve body 19; Gland 2 is connected cylinder 4 tops; Valve 5 is arranged in cylinder 4 inner chambers and its top can slide up and down at gland 2 inner chambers, and first spring 22 withstands between gland 2 and the valve 5, and valve 5 lower ends are provided with annular tip 23; Annular tip 23 is pressed on the chassis 6 of axial hole 20 peripheries; Be connected with safety valve 7 on the upper valve body 19, safety valve 7 open tops are used for communicating with control channel 17, and the bottom opening of safety valve 7 communicates with outlet passageway 18.In this embodiment, safety valve 7 is conventional existing technology, so no longer this gives unnecessary details.

The working principle of the utility model diaphragm type reduction valve is: during use, gas-entered passageway 3 is connected with the pressurized gas pipeline of 45MPa, and outlet passageway 18 is connected with post-decompression low-pressure gas pipeline; At this moment, valve is being close under the effect of first spring 22 and 45MPa pressurized gas on the disk 6 of valve base, at this moment; Gas-entered passageway 3 breaks off with outlet passageway 18, and outlet passageway 18 no pressure are after control channel 17 and control source of the gas are connected; Control gaseous can enter into the bottom of diaphragm chamber 15, and at this moment diaphragm 13 can produce distortion, and die holder 9, punch holder 8 and diaphragm 13 move upward under the effect of control gaseous pressure; Promote push rod 11, push rod 11 promotes valve 5 again, just forms a narrow slit between valve 5 and the chassis 6; The pressurized gas of 45Mpa receive throttling when passing through this slit, pressure reduces and flows out from outlet passageway 18.Heighten the pressure of control gaseous; Just can heighten the height that valve 5 is opened; Slit between valve 5 and the chassis 6 increases thereupon, and the pressure in the outlet passageway 18 also and then increases, when the gas in the outlet passageway 18 reaches the force value of setting; Closing control passage 17, the utility model diaphragm type reduction valve just can infeed the pressed gas of setting value continuously to post-decompression low-pressure gas pipeline through outlet passageway 18.In this process, when reducing, the gas pressures in the outlet passageway 18 also reduce diaphragm 13 downward active forces because of reason in certain (like the decline of the pressure in the gas-entered passageway 3) when the gas pressure in the outlet passageway 18; Diaphragm 13 moves upward under the pressure effect of the bottom of diaphragm chamber 15 reservation gas, and with valve 5 top De Gengkai, the slit between valve 5 and the chassis 6 is bigger through push rod 11; At this moment; Gas pressure in the outlet passageway 18 returns to original gas pressure setting value again, otherwise, when the gas pressure in the outlet passageway 18 raises; Valve 5 moves downward under the effect of first spring, 22 reposition forces; Slit between valve 5 and the chassis 6 reduces, and the pressure in the outlet passageway 18 also can and then reduce, therefore; Slit between valve 5 and the chassis 6 always is in a kind of dynamic equilibrium state, keeps the gas pressure in the outlet passageway 18 stable.

Above-described embodiment describes the preferred implementation of the utility model; Be not that scope to the utility model limits; Under the prerequisite that does not break away from the utility model design spirit; Various distortion and improvement that those of ordinary skills make the technological scheme of the utility model all should fall in the definite protection domain of the utility model claims.

Claims

1. a diaphragm pressure reducing valve, comprising valve body, diaphragm (13), guide disc (10), push rod (11), valve (5) and first spring (22), said valve body comprises The lower valve body (14), the upper valve body (19) connected to the top of the lower valve body (14) and the inlet flange (1) connected to the top of the upper valve body (19), the inlet flange (1) is provided with There is an air intake channel (3), the upper valve body (19) is provided with an air outlet channel (18) communicating with the air intake channel (3), and the lower valve body (14) is provided with a control channel (17) , a diaphragm cavity (15) is provided between the lower valve body (14) and the upper valve body (19), the top of the diaphragm cavity (15) communicates with the air outlet channel (18), and the diaphragm cavity ( 15) The bottom communicates with the control passage (17), the diaphragm (13) is located in the middle of the diaphragm chamber (15) and its edge is sandwiched between the lower valve body (14) and the upper valve body (19), the diaphragm The top surface and the bottom surface of the sheet (13) are respectively pasted with an upper splint (8) and a lower splint (9), and the guide plate (10) is located in the diaphragm cavity (15) and connected with the upper valve body (19) , the push rod (11) is inserted on the guide plate (10) and can slide up and down along the guide plate (10), and one end of the push rod (11) is pushed against the valve (5), and the other end of the push rod (11) On the upper splint (8), a second spring (16) is provided between the upper splint (8) and the guide plate (10), and a second spring (16) is provided between the lower splint (9) and the lower valve body (14). There is a third spring (12), which is characterized in that: it also includes a valve seat and a gland (2) located in the air intake passage (3), and the valve seat is composed of a chassis (6) and a circle at the top of the chassis (6). cylinder (4), the chassis (6) is provided with an axial through hole (20), the lower part of the outer peripheral wall of the cylinder (4) is provided with a radial through hole (21), and the chassis (6) is connected to Between the inlet flange (1) and the upper valve body (19), the gland (2) is connected to the top of the cylinder (4), the valve (5) is located in the inner cavity of the cylinder (4) and its The upper part can slide up and down in the inner cavity of the gland (2), the first spring (22) is pressed between the gland (2) and the valve (5), and the lower end of the valve (5) is provided with an annular tip ( 23), the annular tip (23) is tightly pressed on the chassis (6) around the axial through hole (20).

2. The diaphragm pressure reducing valve according to claim 1, characterized in that: the upper valve body (19) is connected with a safety valve (7), and the top opening of the safety valve (7) is used for controlling The passage (17) communicates, and the bottom opening of the safety valve (7) communicates with the air outlet passage (18).