CN201236784Y - Pressure stabilizing structure of membrane pump - Google Patents

Abstract

The utility model relates to a constant-pressure structure of a diaphragm pump. The constant-pressure structure comprises a controlling component which controls the water flow between a water inlet and a low-pressure cavity to transform between the switch-on state and the switch-off state, because a control lever therein drives the reciprocating motion of the control lever under the combined action of the pressure limiting spring and water pressure of the pressure limiting water cavity. When the output hydraulic pressure of the diaphragm pump in the constant pressure structure is close to or reaches the design value, the control lever is pushed to move downwards, so that the output hydraulic pressure descends until the water sealing diaphragm attached to the control lever is close to a sealed water sealing port; when the output hydraulic pressure is lower than the design value, the pressure limiting spring to action of a water-intake pressure sensing diaphragm overcomes the water pressure of the pressure limiting water cavity to action of a pressure limiting diaphragm, the push lever moves upwards so that the water sealing diaphragm attached with the control lever is far away from the water sealing port, to maintain communication of the waterway. In this way of circulating and reciprocating, the output hydraulic pressure of the diaphragm pump can be substantially restricted within the design value, thereby avoiding secure failure of the product through a reverse osmosis and water purifying device due to the excessively-high hydraulic pressure.

Description

The diaphragm pump isopiestic pressure mechanism

Technical field

The utility model relates to a kind of diaphragm pump isopiestic pressure mechanism.

Background technique

Suction booster is as the significant components of reverse osmosis water cleaning systems, and the control of its output hydraulic pressure has become the difficult point that industry is paid close attention to.Present suction booster is used for the reverse osmosis water cleaning systems and mainly has following influence factor: 1, the fluctuation of source water pressure: reverse osmosis water cleaning systems, suction booster output hydraulic pressure is the flow parameter based on reverse osmosis membrane behind the pump and waste water proportioner, be made as under the 70PSI hydraulic pressure, flow 500ML/MIN (50 gallons per day reverse osmosis equipment), so, the different corresponding different output hydraulic pressure of source water hydraulic pressure is positively related function relation basically; Therefore, the control of source water hydraulic pressure is one of technology option, its objective is the reduction flow of inlet water, and then suction booster output hydraulic pressure is reduced; 2, reverse osmosis membrane is dirty stifled--and----reverse osmosis membrane can produce dirty stifled in running, so the flow behind the suction booster can reduce, corresponding, output hydraulic pressure can increase; Technological scheme is when output hydraulic pressure increases, the corresponding reduction of source water flow of inlet water; Therefore, the pressure sensing type stopped flow technique becomes the option that needs; 3, above-mentioned two kinds of situations stack, so, can cause suction booster after hydraulic pressure increase rapidly, usually can cause its device security fault.In sum, the pressure-sensitive shutoff valve is set, will solves the too high difficult problem of output hydraulic pressure that various factors causes effectively in suction booster water inlet basin.

The model utility content

Technical problem to be solved in the utility model provides a kind of diaphragm pump isopiestic pressure mechanism, has the output stable water pressure of the diaphragm pump of this isopiestic pressure mechanism, and can not surpass the setting hydraulic pressure value.

The technical scheme in the invention for solving the above technical problem is: the diaphragm pump isopiestic pressure mechanism, described diaphragm pump isopiestic pressure mechanism is located in the pump head body, has hyperbaric chamber in the pump head body, low-pressure cavity, hyperbaric chamber, low-pressure cavity respectively with water outlet, water intake is connected, described isopiestic pressure mechanism is positioned on the passage of water intake and low-pressure cavity connection, isopiestic pressure mechanism comprises controlling rod, the pressure limiting diaphragm, water inlet pressure-sensitive diaphragm and the water shutoff mouth of being located on the pump head body and being communicated with the water inlet water outlet, described pressure limiting diaphragm periphery is sealingly fastened between pump head body and the pressure limiting sealing cover, pressure limiting diaphragm central position is sealingly fastened in the controlling rod upper end portion by last attaching nut, cavity between described pressure limiting sealing cover and the pressure limiting diaphragm constitutes the pressure limiting water cavity, and the pressure limiting water cavity is connected by pressure limiting runner and hyperbaric chamber; Described controlling rod has the side of sealing water shutoff mouth, and the side of sealing water shutoff mouth has seal membrane everywhere, and side, the side of seal membrane and the end-face structure of water shutoff mouth of controlling rod sealing water shutoff mouth can seal coupling; Described controlling rod lower end is provided with into water pressure-sensitive diaphragm, water inlet pressure-sensitive diaphragm periphery is sealingly fastened between pump head body and the water inlet sealing cover, water inlet pressure-sensitive diaphragm central position is sealingly fastened in the controlling rod underpart by following attaching nut, be provided with the pressure limiting spring in the cavity between described water inlet sealing cover and the water inlet pressure-sensitive diaphragm, the pressure limiting both ends of the spring acts on down attaching nut and water inlet sealing cover inwall respectively.

The lower end of described controlling rod sealing water shutoff mouth is frustum cone structure, the side of this frustum cone structure and water shutoff mouth sealing coupling, and seal membrane is attached to the outer surface of frustum cone structure.

Described water inlet sealing cover is provided with and the adjustable pressure limiting spring adjusting element that is connected of the sealing cover screw thread of intaking with pressure limiting spring contacting point, and pressure limiting spring lower end acts on pressure limiting spring adjusting element internal surface.

To sum up, the beneficial effects of the utility model are:

1, diaphragm pump isopiestic pressure mechanism of the present utility model since controlling rod at the pressure limiting spring, hydraulic pressure in the water inlet flow channel, the acting in conjunction of hydraulic pressure drives controlling rod to-and-fro motion formation control water intake down in the pressure limiting water cavity, current are logical between the low-pressure cavity, the control unit of disconnected two states conversion, this control unit the output hydraulic pressure of water outlet near or when reaching design load, hydraulic pressure overcomes the pressure-sensitive spring to the active force of pressure limiting diaphragm (hydraulic pressure is opposite to the force direction of pressure limiting diaphragm and water inlet pressure-sensitive diaphragm in the water inlet flow channel to the active force of water inlet pressure-sensitive diaphragm in the pressure limiting water cavity, basically cancel each other), push lever moves down, the approaching water shutoff mouth that seals of the water shutoff diaphragm that makes controlling rod have, source water is dammed until blocking current, just can be so that output hydraulic pressure descends; When output hydraulic pressure when being lower than design load, the pressure limiting spring overcomes to the active force of water inlet pressure-sensitive diaphragm that hydraulic pressure is to the active force of pressure limiting diaphragm in the pressure limiting water cavity, and push lever moves up, and makes water shutoff diaphragm that controlling rod has away from the water shutoff mouth, keeps current to connect.So move in circles, the output hydraulic pressure of diaphragm pump just can be subject in the setting value basically.When on the family expenses reverse osmosis equipment, using, can avoid the reverse osmosis water purification plant because the too high product safety fault that causes of hydraulic pressure.

2, the lower end of the utility model controlling rod sealing water shutoff mouth is frustum cone structure, and seal membrane is attached to the outer surface of frustum cone structure.Owing to seal the water shutoff open area of the water shutoff mouth area of contour in the horizontal direction of coupling mutually less than horizontal opening under the equal bore with this frustum cone structure, therefore this controlling rod that dams can reduce the power of bouncing of hydraulic pressure when sealing water shutoff mouth, reduces even gets rid of vibrations; The side of the frustum cone structure of this controlling rod that dams has certain inclination, therefore also is convenient to its better sealing water shutoff mouth when the controlling rod that dams moves up and down.

Description of drawings

Fig. 1 is a structural representation of the present utility model;

Fig. 2 is that the A-A of Fig. 1 is to sectional view.

Mark and corresponding component title among the figure: 101-water outlet, 102-low-pressure cavity, 103-hyperbaric chamber, 104-pressure limiting runner, 105-pressure limiting sealing cover, 106-upward attaching nuts, 107-pressure limiting diaphragm, 108-controlling rod, 109-water intake, 110-water inlet water outlet, 111-water shutoff mouth, 112-seal membrane, 113-water inlet flow channel, 114-water inlet pressure-sensitive diaphragm, 115-following attaching nut, 116-pressure limiting spring, 117-water inlet sealing cover, 118-spring adjusting element, 119-pump head body, 120-pressure limiting water cavity.

Embodiment

With reference to Fig. 1, shown in Figure 2, diaphragm pump isopiestic pressure mechanism of the present utility model, it is located on the pump head body 119, has hyperbaric chamber 103 in the pump head body 119, low-pressure cavity 102, hyperbaric chamber 103, low-pressure cavity 102 respectively with water outlet 101, water intake 109 is connected, has isopiestic pressure mechanism on the passage that described water intake 109 and low-pressure cavity 102 are connected, described isopiestic pressure mechanism comprises controlling rod 108, pressure limiting diaphragm 107, water inlet pressure-sensitive diaphragm 114 and the water shutoff mouth of being located on the pump head body 119 111, described pressure limiting diaphragm 107 peripheries are sealingly fastened between pump head body 119 and the pressure limiting sealing cover 105, pressure limiting diaphragm 107 central positions are sealingly fastened in controlling rod 108 upper end portions by last attaching nut 106, cavity between described pressure limiting sealing cover 105 and the pressure limiting diaphragm 107 constitutes pressure limiting water cavity 120, and pressure limiting water cavity 120 is connected by pressure limiting runner 104 and hyperbaric chamber 103; Described controlling rod 108 has the frustum cone structure part of sealing water shutoff mouth 111, this frustum cone structure partly has seal membrane 112, and frustum cone structure part side, the side of seal membrane 112 and the end-face structure of water shutoff mouth 111 of controlling rod 108 sealing water shutoff mouths 111 can seal coupling; Described controlling rod 108 lower end are provided with into water pressure-sensitive diaphragm 114, water inlet pressure-sensitive diaphragm 114 peripheries are sealingly fastened between pump head body 119 and the water inlet sealing cover 117, water inlet pressure-sensitive diaphragm 114 central positions are sealingly fastened in controlling rod 108 underparts by following attaching nut 115, be provided with pressure limiting spring 116 in the cavity between described water inlet sealing cover 117 and the water inlet pressure-sensitive diaphragm 114, pressure limiting spring 116 two ends act on down attaching nut 115 and water inlet sealing cover 117 inwalls respectively; Described water inlet sealing cover 117 is provided with and the adjustable pressure limiting spring adjusting element 118 that is connected of sealing cover 117 screw threads of intaking with pressure limiting spring 116 contacting points, and pressure limiting spring 116 lower ends act on pressure limiting spring adjusting element 118 internal surfaces; The lower end of described controlling rod 108 sealing water shutoff mouths 111 is frustum cone structure, and seal membrane 106 is attached to the outer surface of frustum cone structure.

Claims (3)

1, the diaphragm pump isopiestic pressure mechanism, described diaphragm pump isopiestic pressure mechanism is located in the pump head body (119), has hyperbaric chamber (103) in the pump head body (119), low-pressure cavity (102), hyperbaric chamber (103), low-pressure cavity (102) respectively with water outlet (101), water intake (109) is connected, it is characterized in that, described isopiestic pressure mechanism is positioned on the passage of water intake (109) and low-pressure cavity (102) connection, isopiestic pressure mechanism comprises controlling rod (108), pressure limiting diaphragm (107), water inlet pressure-sensitive diaphragm (114) and be located at the water shutoff mouth (111) that pump head body (119) is gone up and be communicated with water inlet water outlet (110), described pressure limiting diaphragm (107) periphery is sealingly fastened between pump head body (119) and the pressure limiting sealing cover (105), pressure limiting diaphragm (107) central position is sealingly fastened in controlling rod (108) upper end portion by last attaching nut (106), cavity between described pressure limiting sealing cover (105) and the pressure limiting diaphragm (107) constitutes pressure limiting water cavity (120), and pressure limiting water cavity (120) is connected by pressure limiting runner (104) and hyperbaric chamber (103); Described controlling rod (108) has the side of sealing water shutoff mouth (111), the side of sealing water shutoff mouth (111) has seal membrane (112) everywhere, and side, the side of seal membrane (112) and the end-face structure of water shutoff mouth (111) of controlling rod (108) sealing water shutoff mouth (111) can seal coupling; Described controlling rod (108) lower end is provided with into water pressure-sensitive diaphragm (114), water inlet pressure-sensitive diaphragm (114) periphery is sealingly fastened between pump head body (119) and the water inlet sealing cover (117), water inlet pressure-sensitive diaphragm (114) central position is sealingly fastened in controlling rod (108) underpart by following attaching nut (115), be provided with pressure limiting spring (116) in the cavity between described water inlet sealing cover (117) and the water inlet pressure-sensitive diaphragm (114), pressure limiting spring (116) two ends act on down attaching nut (115) and water inlet sealing cover (117) inwall respectively.

2, diaphragm pump isopiestic pressure mechanism according to claim 1, it is characterized in that, the lower end of described controlling rod (108) sealing water shutoff mouth (111) is frustum cone structure, the side of this frustum cone structure and water shutoff mouth (111) sealing coupling, and seal membrane (112) is attached to the outer surface of frustum cone structure.

3, diaphragm pump isopiestic pressure mechanism according to claim 1 and 2, it is characterized in that, described water inlet sealing cover (117) is provided with and the adjustable pressure limiting spring adjusting element (118) that is connected of the sealing cover of intaking (117) screw thread with pressure limiting spring (116) contacting point, and pressure limiting spring (116) lower end acts on pressure limiting spring adjusting element (118) internal surface.

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