CN201747983U - Negative-pressure stop valve - Google Patents

Abstract

The utility model relates to a negative-pressure stop valve, which comprises a valve seat, wherein the valve seat is internally provided with a water source inlet, a water source outlet and a filtered water outlet which are communicated, wherein a channel for communicating the filtered water outlet with the water source inlet and the water source outlet is internally provided with a pressure-limiting assembly. In the utility model, since the channel for communicating the filtered water outlet with the water source inlet and the water source outlet is internally additionally provided with the pressure-limiting assembly, the pressure-limiting assembly can adopt the structure similar to the pressure-limiting structure in the existing water channel pressure-limiting valve or reducing valve, with the pressure-limiting assembly, after water passes through the pressure-limiting structure, the pressure of water flowed from the filtered water outlet can be limited within the preset water-pressure range, and no potential safety hazard can be caused to the water purification system. Compared with the prior art that the water channel pressure-limiting valve or reducing valve is arranged in front of a booster water pump to independently serve as the pressure-limiting (reducing) assembly, the pressure-limiting assembly of the technical scheme omits the valve seat of the pressure-limiting valve, saves cost and is convenient to install and apply.

Description

Negative-pressure stop valve

Technical field

The utility model relates to a kind of negative-pressure stop valve.

Background technique

At present; the three-way valve of pure water machine system or tee union all only have the function of common threeway; the function and the filtering function that do not have pressure limiting; on the one hand; when source water hydraulic pressure is bigger; usually can cause potential safety hazard to pure water machine system, common way is to set up a pressure-limit valve to solve the bigger problem of source water hydraulic pressure in the water route.But, in pure water machine system, not only use reduction valve but also use three-way valve, increase the cost of required accessory of pure water machine system and installation.On the other hand, existing valve does not have filtering function, supercharging with the function of cutting off the water supply is cut off the water supply first order filter element that pump can only be installed on pure water machine system is after the PP face lauter tub, that is to say, the cotton lauter tub of PP directly docks with the main water supply tube net, when source water hydraulic pressure was higher, there was bigger pressure-bearing potential safety hazard in this lauter tub; Therefore in order to promote the Safety performance of domestic water purifying machine, to have the negative-pressure stop valve of pressure limiting function and filtering function and the supercharging pump stack mounting water purification machine first order filter element of cutting off the water supply is before the cotton lauter tub of PP, promptly becomes the necessary and feasible scheme that improves the domestic water purifying machine Safety performance.

The model utility content

Technical problem to be solved in the utility model provides a kind of negative-pressure stop valve with pressure limiting function, and this negative-pressure stop valve can solve the potential safety hazard of bringing when water hydraulic pressure in source is big in the pure water machine system.

The utility model solves the problems of the technologies described above the technological scheme that is adopted: negative-pressure stop valve, comprise valve seat, the source water inlet that has mutual connection in the valve seat, source water water outlet, filter back water out, be provided with the pressure limiting assembly in the passage that described filter back water out and source water inlet and source water water outlet are connected, described pressure limiting assembly comprises the water inlet that is formed by the valve seat body mouth that dams, low pressure water shutoff mouth and the controlling rod that is positioned at valve seat, last pressure-sensitive diaphragm reaches pressure-sensitive diaphragm down, the described pressure-sensitive diaphragm periphery of going up is sealingly fastened between valve body and the upper press cover, last pressure-sensitive diaphragm central position is by Upper gasket and tighten nut seal and be fixed in the controlling rod upper-end surface, the described cavity of going up between pressure-sensitive diaphragm and the valve body constitutes filter opisthogenesis water cavity, is provided with the water flowing pin hole between filter opisthogenesis water cavity and the filter opisthogenesis water channel; Cavity between described controlling rod and the upper press cover constitutes atmospheric pressure cavity, and upper press cover is provided with vent, and atmospheric pressure cavity is connected by vent and ambient atmosphere; Described controlling rod has mouth and the low pressure water shutoff oral-lateral face of damming of intaking that seal, controlling rod sealing water inlet is dammed mouthful, low pressure water shutoff oral-lateral mask has the soft cover of sealing, and the open end structure of described controlling rod sealing water inlet is dammed mouthful, the side and the water inlet of the side of low pressure water shutoff mouth, the soft cover of sealing are dammed mouth, low pressure water shutoff mouth seals coupling mutually; Described valve body is interior to be provided with pressure-sensitive diaphragm down at place, controlling rod lower end surface, following pressure-sensitive diaphragm periphery is sealingly fastened between valve body and the lower cover, following pressure-sensitive diaphragm central position is by pressure-sensitive backing plate and following tightening nut are sealingly fastened in the controlling rod lower end surface down, cavity between described pressure-sensitive diaphragm down and the lower cover constitutes the low pressure water cavity, and the low pressure water cavity is connected by the low-pressure water runner and the water route at water out place, filter back; Be provided with in the described low pressure water cavity and help the envelope spring, help the envelope both ends of the spring to act on lower cover inwall and controlling rod lower end surface respectively; The drive controlling rod to-and-fro motion under helping the acting in conjunction of sealing spring, filtering hydraulic pressure in opisthogenesis water cavity and the low pressure water cavity of described controlling rod constitutes controls the control unit that current are changed at the switching two states between mouth, the low pressure water shutoff mouth that dams of intaking.

Described controlling rod is frustum cone structure.

The negative-pressure stop valve of this programme water out and source water inlet and filter in the passage that preceding source water out connects and set up the pressure limiting assembly after filter, this pressure limiting assembly can adopt the pressure limiting structure that is similar in existing water route pressure-limit valve or the reduction valve, after adopting the pressure limiting assembly, can guarantee that the hydraulic pressure that filter back water out flows out behind pressure limiting structure is limited in the range hydraulic pressure of setting, can not cause potential safety hazard to pure water machine system.Compare as the limited (less) pressure assembly separately before pressure-limit valve or reduction valve are located at booster water pump with existing, the pressure limiting assembly of this programme has been saved the pressure-limit valve valve seat, saves cost and is convenient to install and use.

To sum up, the beneficial effects of the utility model are: negative-pressure stop valve of the present utility model water out and source water inlet and filter in the passage that preceding source water out connects and set up the pressure limiting assembly after filter, can guarantee that the hydraulic pressure that filter back water out flows out behind pressure limiting structure is limited in the range hydraulic pressure of setting, can not cause potential safety hazard to pure water machine system.Compare as the limited (less) pressure assembly separately before pressure-limit valve or reduction valve are located at booster water pump with existing, the pressure limiting assembly of this programme has been saved the pressure-limit valve valve seat, saves cost and is convenient to install and use.

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: 101-filter back water out among the figure, 102-valve seat, 103-controlling rod, 104-low pressure water shutoff mouth, 105-seals soft cover, 106-filter opisthogenesis water cavity, the last pressure-sensitive diaphragm of 107-, the 108-Upper gasket, 109-tightens nut, the 111-upper press cover, 115-water flowing pin hole, the 116-water inlet mouth that dams, 117-filter opisthogenesis water channel, 118-filters preceding source water channel, 119-filter screen, the 120-lower cover, 121-low pressure water cavity, 122-helps the envelope spring, tightening nut under the 123-, pressure-sensitive backing plate under the 124-, pressure-sensitive diaphragm under the 125-, 126-press seal backing plate, 127-low-pressure water runner, 128-source water water outlet, the 129-positioning baffle, encircle ring before the ring seal circle behind the 131-filter screen, 132-filter screen behind the 130-filter screen, ring seal circle before the 133-filter screen, 134-source water inlet, 135-vent, 136-atmospheric pressure cavity.

Embodiment

Extremely shown in Figure 2 referring to Fig. 1, negative-pressure stop valve of the present utility model, comprise valve seat 102, have source water inlet 134, source water water outlet 128, the filter back water out 101 of mutual connection in the valve seat 102, be provided with the pressure limiting assembly in the passage that described filter back water out 101 and source water inlet 134 and source water water outlet 128 are connected; Be provided with the filter screen 119 with hollow duct in the passage that described source water inlet 134, source water water outlet 128 are connected, filter screen 119 two ends are fixed by ring seal circle before ring seal circle 131, the filter screen behind the filter screen 133 and valve seat 102 inner wall sealings respectively; Hollow duct in the described filter screen 119 constitutes the preceding source of filter water channel 118, and filter screen 119 outer basins constitute filter opisthogenesis water channel 117, and described pressure limiting assembly feed-water end communicates with filter opisthogenesis water channel 117, and pressure limiting assembly waterexit end communicates with filter back water out 101; The end that described filter screen 119 closes on source water inlet 134 is fixed on the preceding ring 132 of filter screen, and ring seal circle 133 is located between preceding ring 132 of filter screen and valve seat 102 inwalls before the filter screen; The end that filter screen 119 closes on source water water outlet 128 is fixed in behind the filter screen on the ring 130, and ring seal circle 131 is located at behind the filter screen between the ring 130 and valve seat 102 inwalls behind the filter screen; Described pressure limiting assembly comprises that the water inlet that is formed by valve seat 102 bodies dams mouthfuls 116, low pressure water shutoff mouth 104 and the controlling rod 103 that is positioned at valve seat 102, last pressure-sensitive diaphragm 107 reaches pressure-sensitive diaphragm 125 down, described pressure-sensitive diaphragm 107 peripheries of going up are sealingly fastened between valve body 102 and the upper press cover 111, last pressure-sensitive diaphragm 107 central positions are by Upper gasket 108 and tighten nut 109 and be sealingly fastened in controlling rod 103 upper-end surfaces, the described cavity of going up between pressure-sensitive diaphragm 107 and the valve body 102 constitutes filter opisthogenesis water cavity 106, is provided with water flowing pin hole 115 between filter opisthogenesis water cavity 106 and the filter opisthogenesis water channel 117; Cavity between described controlling rod 103 and the upper press cover 111 constitutes atmospheric pressure cavity 136, and upper press cover 111 is provided with vent 135, and atmospheric pressure cavity 136 is connected by vent 135 and ambient atmosphere; Described controlling rod 103 has sealing water inlet and dams mouthfuls 116 and low pressure water shutoff mouth 104 sides, controlling rod 103 sealing water inlet dams mouthfuls 116, low pressure water shutoff mouth 104 sides have the soft cover 105 of sealing, and the open end structure of described controlling rod 103 sealing water inlets dam mouthfuls 116, the side and the water inlet of the side of low pressure water shutoff mouth 104, the soft cover 105 of sealing are dammed mouth 116, low pressure water shutoff mouth 104 seals coupling mutually; Be provided with following pressure-sensitive diaphragm 125 at place, controlling rod 103 lower end surfaces in the described valve body 102, following pressure-sensitive diaphragm 125 peripheries are sealingly fastened between valve body 102 and the lower cover 120, following pressure-sensitive diaphragm 125 central positions are by pressure-sensitive backing plate 124 and following tightening nut 123 are sealingly fastened in controlling rod 103 lower end surfaces down, cavity between described pressure-sensitive diaphragm 125 down and the lower cover 120 constitutes low pressure water cavity 121, and low pressure water cavity 121 is connected by the low-pressure water runner 127 and the water route at water out 101 places, filter back; Be provided with in the described low pressure water cavity 121 and help envelope spring 122, help envelope spring 122 two ends to act on lower cover 120 inwalls and controlling rod 103 lower end surfaces respectively; Drive controlling rod 103 to-and-fro motion under helping the acting in conjunction of sealing spring 122, filtering hydraulic pressure in opisthogenesis water cavity 106 and the low pressure water cavity 121 of described controlling rod 103 constitute controls the control unit that current are changed at the switching two states between mouth 116, the low pressure water shutoff mouth 104 that dams of intaking; Described controlling rod 103 is frustum cone structure.

Said structure can filter source water owing to be provided with filter screen in the passage that source water inlet, source water out are connected, and filtered water source is by filtering the position that the back water out can be delivered to needs to use filter back water; Filter screen in this negative-pressure stop valve can be made cylindric, the hollow duct of cylindric filter screen is the source water channel, when the source of unlatching water out uses source water, source water in the water channel of source can wash the filter screen inwall, play the effect of cleaning filter screen, therefore the filter screen of this negative-pressure stop valve is difficult for stopping up, and can use for a long time also and need not clean.

Claims (2)

1. negative-pressure stop valve, comprise valve seat (102), the source water inlet (134) that has mutual connection in the valve seat (102), source water water outlet (128), filter back water out (101), it is characterized in that, be provided with the pressure limiting assembly in the passage that described filter back water out (101) and source water inlet (134) and source water water outlet (128) are connected, described pressure limiting assembly comprises the water inlet that is formed by valve seat (102) body dam mouthful (116), low pressure water shutoff mouth (104) and be positioned at the controlling rod (103) of valve seat (102), last pressure-sensitive diaphragm (107) reaches pressure-sensitive diaphragm (125) down, described pressure-sensitive diaphragm (107) periphery of going up is sealingly fastened between valve body (102) and the upper press cover (111), last pressure-sensitive diaphragm (107) central position is by Upper gasket (108) and tighten nut (109) and be sealingly fastened in controlling rod (103) upper-end surface, the described cavity of going up between pressure-sensitive diaphragm (107) and the valve body (102) constitutes filter opisthogenesis water cavity (106), is provided with water flowing pin hole (115) between filter opisthogenesis water cavity (106) and the filter opisthogenesis water channel (117); Cavity between described controlling rod (103) and the upper press cover (111) constitutes atmospheric pressure cavity (136), and upper press cover (111) is provided with vent (135), and atmospheric pressure cavity (136) is connected by vent (135) and ambient atmosphere; Described controlling rod (103) has sealing water inlet dam mouthful (116) and low pressure water shutoff mouth (a 104) side, controlling rod (103) sealing water inlet is dammed mouthful (116), low pressure water shutoff mouth (104) side has sealing soft cover (105), and described controlling rod (103) sealing water inlet the dam open end structure of mouth (116), low pressure water shutoff mouth (104) of the side of mouthful (116), low pressure water shutoff mouth (104), the side and the water inlet that seal soft cover (105) of damming seals coupling mutually; Place, the inherent controlling rod of described valve body (102) (103) lower end surface is provided with down pressure-sensitive diaphragm (125), following pressure-sensitive diaphragm (125) periphery is sealingly fastened between valve body (102) and the lower cover (120), following pressure-sensitive diaphragm (125) central position is by pressure-sensitive backing plate (124) and following tightening nut (123) are sealingly fastened in controlling rod (103) lower end surface down, cavity between described pressure-sensitive diaphragm (125) down and the lower cover (120) constitutes low pressure water cavity (121), and low pressure water cavity (121) is connected by the low-pressure water runner (127) and the water route at water out (101) place, filter back; Be provided with in the described low pressure water cavity (121) and help envelope spring (122), help envelope spring (122) two ends to act on lower cover (120) inwall and controlling rod (103) lower end surface respectively; Described controlling rod (103) drive controlling rod (103) to-and-fro motion under helping the acting in conjunction of sealing hydraulic pressure in spring (122), filter opisthogenesis water cavity (106) and the low pressure water cavity (121) constitutes controls the control unit that current are changed at the switching two states between mouthful (116), the low pressure water shutoff mouth (104) that dams of intaking.

2. negative-pressure stop valve according to claim 1 is characterized in that, described controlling rod (103) is frustum cone structure.

Images