CN201013989Y - Pressure-limiting valve - Google Patents
Pressure-limiting valve Download PDFInfo
- Publication number
- CN201013989Y CN201013989Y CNU200720078915XU CN200720078915U CN201013989Y CN 201013989 Y CN201013989 Y CN 201013989Y CN U200720078915X U CNU200720078915X U CN U200720078915XU CN 200720078915 U CN200720078915 U CN 200720078915U CN 201013989 Y CN201013989 Y CN 201013989Y
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- China
- Prior art keywords
- pressure
- cavity
- water
- pressure element
- inlet cavity
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 61
- 238000007789 sealing Methods 0.000 claims abstract description 16
- 230000000670 limiting effect Effects 0.000 abstract description 11
- 239000012528 membrane Substances 0.000 description 3
- 238000001223 reverse osmosis Methods 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 235000020188 drinking water Nutrition 0.000 description 1
- 239000003651 drinking water Substances 0.000 description 1
- 239000002384 drinking water standard Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- Control Of Fluid Pressure (AREA)
Abstract
The utility model relates to a pressure limiting valve. A control rod arranged in the pressure limiting valve is provided with an auxiliary inlet channel and a flow passage with a low pressure cavity. An inlet cavity is communicated with an auxiliary inlet cavity through the auxiliary inlet channel and the lower pressure cavity is communicated with an auxiliary low pressure cavity through the flow passage of the low pressure cavity. A sealing drop panel is arranged at the lower end of the control rod. The bearing area for bearing the water pressure of the inlet cavity of the sealing drop panel is equal to the bearing area at the upper end of the control rod for bearing the water pressure of the auxiliary inlet cavity. The inlet cavity is communicated with the auxiliary inlet cavity through the auxiliary inlet channel arranged in the control rod. The acting force to the control rod caused by the water pressure of the inlet cavity is balanced out by the acting force to the control rod caused by the water pressure of the auxiliary inlet cavity, therefore, no change to the limiting value of the pressure limiting valve is caused no matter how the water pressure of the inlet cavity changes. Therefore, the utility model can be widely applied as a water pressure control valve for a domestic pure water machine.
Description
Technical field
The utility model relates to a kind of pressure-limit valve.
Background technique
Along with expanding economy, the trend that water resources situation worsens has appearred in many places, and shortage of water resources and pollution are more and more serious, and city dweller's drinking water safety problem highlights.At the secondary pollution problem of city tap-water and because source water pollutes the harmful matter that renews in tap water, more and more be that the domestic water purifying machine of core filter element enters huge numbers of families with the reverse osmosis membrane.Existing domestic water purifying machine is to be the core filter element with the reverse osmosis membrane, through after the multistage pretreatment and supercharging to tap water, enters reverse osmosis membrane unit again, the pure water that produces can meet the drinking water standard of developed country fully.But in existing domestic water purifying machine, pressure-limit valve adopts blocked or intercept type valve, and the water hydraulic pressure instability that adopts the blocked valve to flow out through pressure-limit valve can increase with the increase that flows to pressure-limit valve hydraulic pressure, and security and stability is lower; Adopt the intercept type valve to form dither easily, be unfavorable for popularizing.
The model utility content
Technical problem to be solved in the utility model provides a kind of pressure limiting effect stability, can be with importing the pressure-limit valve that variation in water pressure changes.
The utility model solves the problems of the technologies described above the technological scheme that is adopted: pressure-limit valve, and comprise water-inlet cavity, valve body and be positioned at the controlling rod of valve body, be provided with secondary water-inlet cavity, low-pressure cavity, secondary depression chamber in the described valve body; Be provided with secondary intake tunnel and low-pressure cavity runner in the controlling rod; Water-inlet cavity is communicated with by secondary intake tunnel with secondary water-inlet cavity, and low-pressure cavity is communicated with by the low-pressure cavity runner with the secondary depression chamber; Described controlling rod also is provided with and is subjected to hydraulic pressure and resilient member acting in conjunction to make controlling rod produce reciprocating pressure-sensitive assembly; The controlling rod lower end is provided with the sealing supporting plate, and main seal ring set on the sealing supporting plate is corresponding with the primary seal mouth of a river; The controlling rod upper end is provided with secondary water shutoff mouth, and corresponding with secondary seal ring; The water shutoff area at the primary seal mouth of a river equates with the water shutoff area of secondary water shutoff mouth or is approaching; The spacing of the primary seal mouth of a river and secondary seal ring equates with the spacing of main seal ring and secondary water shutoff mouth; Described resilient member is arranged in the secondary water-inlet cavity, and the resilient member two ends act on respectively on the inwall of controlling rod upper end and valve upper cover; The controlling rod to-and-fro motion constitute to the primary seal water assembly that forms current switching two states between water-inlet cavity and the low-pressure cavity and form secondary water-inlet cavity and the secondary depression chamber between the control of secondary water shutoff assembly of current switching two states.
Because the primary seal mouth of a river equates that with the water shutoff area of secondary water shutoff mouth the spacing of the primary seal mouth of a river and secondary seal ring equates that with the spacing of main seal ring and secondary water shutoff mouth water-inlet cavity is communicated with by the secondary intake tunnel in the controlling rod with secondary water-inlet cavity, because P
1S
1=P
2S
2(P
1Be hydraulic pressure in the water-inlet cavity, P
2Be hydraulic pressure in the secondary water-inlet cavity, S
1Be the area at the primary seal mouth of a river, S
2Be the area of secondary water shutoff mouth, and P
1=P
2, S
1=S
2), promptly water-inlet cavity hydraulic pressure, secondary water-inlet cavity hydraulic pressure are just in time offset the opposition that controlling rod produces, and therefore no matter how water-inlet cavity hydraulic pressure changes, and can not cause the voltage limiting value P of pressure-limit valve
0Change.S
1, S
2Can be approaching (S
1, S
2Size differs and is no more than 10%), make hydraulic pressure less to the net effort of controlling rod.When pressure-sensitive assembly moving resistance is constant k, P
0=(F
0+ k)/(S
3-S
4) (P
0Be the voltage limiting value of pressure-limit valve, be the maximum value of hydraulic pressure in the low-pressure cavity, S
3Be the bearing area that main pressure element bears low-pressure cavity hydraulic pressure, F
0The initial elastic force of resilient member when being in sealing state for valve, S
4Bear the bearing area of secondary depression chamber hydraulic pressure for secondary pressure element).The spacing of the primary seal mouth of a river and secondary seal ring equates with the spacing of main seal ring and secondary water shutoff mouth, guarantee to control when controlling rod moves back and forth main sealing assembly and secondary black box sealed valve simultaneously, controlling rod drives the to-and-fro motion of sealing supporting plate, the primary seal mouth contacts the sealing that forms water-inlet cavity and low-pressure cavity with main seal ring, secondary sealed mouth contacts the sealing that forms secondary water-inlet cavity and secondary depression chamber with secondary seal ring simultaneously.
Described pressure-sensitive assembly is made of secondary pressure element that bears secondary depression chamber hydraulic pressure and the main pressure element that bears low-pressure cavity hydraulic pressure, and the area of contact in secondary pressure element and secondary depression chamber is less than the area of contact of main pressure element and low-pressure cavity; Move cavity for pressure element between main pressure element and the secondary pressure element.
Described secondary pressure element, top plate, main pressure element, bottom plate are sleeved on the controlling rod successively and are fixed by upper cap nut, and secondary pressure element periphery is fixed by loam cake, middle cover, and main pressure element periphery is fixed by middle cover, valve seat.
Described secondary pressure element and main pressure element and controlling rod can be made as integrative-structure, secondary pressure element and main pressure element are respectively equipped with seal ring, the seal ring periphery of secondary pressure element contacts with upper interior surface, and the seal ring periphery of main pressure element contacts with valve seat interior surface.
Described water outlet is communicated with the secondary depression chamber by outlet passage.
Described water outlet is communicated with low-pressure cavity by outlet passage.
To sum up, the beneficial effects of the utility model are: because the primary seal mouth of a river equates with the water shutoff area of secondary water shutoff mouth, the spacing of the primary seal mouth of a river and secondary seal ring equates with the spacing of main seal ring and secondary water shutoff mouth, water-inlet cavity is communicated with by the secondary intake tunnel in the controlling rod with secondary water-inlet cavity, be water-inlet cavity hydraulic pressure, secondary water-inlet cavity hydraulic pressure is just in time offset the opposition that controlling rod produces, therefore no matter how water-inlet cavity hydraulic pressure changes, the voltage limiting value that can not cause pressure-limit valve changes, and also can not occur the vibration that the intrinsic voltage limiting value of blocked valve is influenced by intake pressure or the intercept type valve is intrinsic simultaneously.
Description of drawings
Fig. 1 is the utility model embodiment 1 a structural representation;
Fig. 2 is the utility model embodiment 2 a structural representation.
Embodiment
Embodiment 1:
As shown in Figure 1, pressure-limit valve of the present utility model comprises water-inlet cavity 127, secondary water-inlet cavity 117, low-pressure cavity 123, secondary depression chamber 119, by loam cake 118, middle cover 121, the valve body that valve seat 122 and lower cover 126 constitute, be positioned at the controlling rod 120 of valve body, be provided with secondary intake tunnel 125 and low-pressure cavity runner 110 in the controlling rod 120, water-inlet cavity 127 is communicated with by secondary intake tunnel 125 with secondary water-inlet cavity 117, low-pressure cavity 123 is communicated with by low-pressure cavity runner 110 with secondary depression chamber 119, controlling rod also is provided with and is subjected to hydraulic pressure and spring acting in conjunction to make controlling rod 120 produce reciprocating pressure-sensitive assembly, the pressure-sensitive assembly is made of secondary pressure element 109 that bears secondary depression chamber 119 hydraulic pressure and the main pressure element 107 that bears low-pressure cavity 123 hydraulic pressure, and the area of contact in secondary pressure element 109 and secondary depression chamber 119 is less than the area of contact of main pressure element 107 with low-pressure cavity 123; Move cavity for pressure element between main pressure element 107 and the secondary pressure element 109.Controlling rod 120 lower ends are provided with sealing supporting plate 102, and the main seal ring 103 which is provided with is corresponding with the primary seal mouth of a river 104; Controlling rod upper end is provided with secondary water shutoff mouth 112, and corresponding with secondary seal ring 113; And the primary seal mouth of a river 104 equates that with the water shutoff area of secondary water shutoff mouth 113 spacing of the primary seal mouth of a river 104 and secondary seal ring 113 equates with the spacing of main seal ring 103 and secondary water shutoff mouth 112.Spring is arranged at secondary water-inlet cavity 117 interior its two ends and acts on respectively on the inwall of controlling rod 120 upper ends and valve upper cover 118, and controlling rod 120 to-and-fro motion formation is to primary seal water assembly that forms current switching two states between water-inlet cavity 127 and the low-pressure cavity 123 and the control that forms the secondary water shutoff assembly of current switching two states between secondary water-inlet cavity 117 and the secondary depression chamber 119.The primary seal water assembly comprises the primary seal mouth of a river 104 that low-pressure cavity 123 bottoms form, is fixed on the sealing supporting plate 102 of controlling rod 120 lower ends and is arranged on the sealing supporting plate 102 main seal ring 103 with the primary seal mouth of a river 104 couplings by lower nut 124, and secondary water shutoff assembly also comprises the secondary water shutoff mouth 112 that controlling rod 120 upper ends form and is arranged in the loam cake 118 secondary seal ring 113 with secondary water shutoff mouths 112 couplings.Secondary pressure element 109, top plate 108, main pressure element 107, bottom plate 106 are sleeved on successively on the controlling rod 120 and are fixed by upper cap nut 105, secondary pressure element 109 peripheries are fixed by loam cake 118, middle cover 121, and main pressure element 107 peripheries are fixed by middle cover 121, valve seat 122.Water outlet 114 is communicated with secondary depression chamber 119 by outlet passage.
Embodiment 2:
As shown in Figure 2, present embodiment and embodiment's 1 difference is, valve body is made of loam cake 118, valve seat 122, lower cover 126, secondary pressure element 109 and main pressure element 107 are made as integrative-structure with controlling rod 120, secondary pressure element 109 and main pressure element 107 are respectively equipped with seal ring 211, seal ring 211 peripheries of secondary pressure element 109 contact with loam cake 118 internal surfaces, and seal ring 211 peripheries of main pressure element 107 contact with valve seat 122 internal surfaces.Other each several part structures are identical with embodiment 1.
The working principle of the utility model multifunction valve is: because the primary seal mouth of a river equates with the water shutoff area of secondary water shutoff mouth, the spacing of the primary seal mouth of a river and secondary seal ring equates with the spacing of main seal ring and secondary water shutoff mouth, water-inlet cavity is communicated with by the secondary intake tunnel in the controlling rod with secondary water-inlet cavity, because P
1S
1=P
2S
2(P
1Be hydraulic pressure in the water-inlet cavity, P
2Be hydraulic pressure in the secondary water-inlet cavity, S
1Be the area at the primary seal mouth of a river, S
2Be the area of secondary water shutoff mouth, and P
1=P
2, S
1=S
2), promptly water-inlet cavity hydraulic pressure, secondary water-inlet cavity hydraulic pressure are just in time offset the opposition that controlling rod produces, and therefore no matter how water-inlet cavity hydraulic pressure changes, and can not cause the voltage limiting value P of pressure-limit valve
0Change.When pressure-sensitive assembly moving resistance is constant k, P
0=(F
0+ k)/(S
3-S
4) (P
0Be the voltage limiting value of pressure-limit valve, i.e. the maximum value of hydraulic pressure in the low-pressure cavity, S
3Be the bearing area that main pressure element bears low-pressure cavity hydraulic pressure, F
0The initial elastic force of resilient member when being in sealing state for valve, S
4Bear the bearing area of secondary depression chamber hydraulic pressure for secondary pressure element).The water-inlet cavity of pressure-limit valve is connected with high-pressure water by pipeline, and controlling rod water-inlet cavity and low-pressure cavity under the effect of resilient member elastic force is in the water route on-state during original state, along with hydraulic pressure P in the low-pressure cavity
3Increase, work as P
3S
3＞F
0+ P
0S
4+kThe time, controlling rod moves up under hydraulic action and forms sealing relationship up to water-inlet cavity and low-pressure cavity, secondary water-inlet cavity and secondary depression chamber, because low-pressure cavity is communicated with by the low-pressure cavity runner with the secondary depression chamber, along with the water in the secondary depression chamber flows out, hydraulic pressure reduces, hydraulic pressure reduces thereupon in the low-pressure cavity, controlling rod can move down under the elastic force effect of resilient member, make water-inlet cavity and low-pressure cavity be in the water route on-state, repeat above-mentioned working procedure, just can realize the output hydraulic pressure of stable restriction pressure-limit valve.In valve design is made, P
0Be can be according to adjusting S
3, F
0, S
4The size of value is adjusted.
Claims (6)
1. pressure-limit valve comprises water-inlet cavity (127), valve body and is positioned at the controlling rod (120) of valve body, it is characterized in that, is provided with secondary water-inlet cavity (117), low-pressure cavity (123), secondary depression chamber (119) in the described valve body; Be provided with secondary intake tunnel (125) and low-pressure cavity runner (110) in the controlling rod (120); Water-inlet cavity (127) is communicated with by secondary intake tunnel (125) with secondary water-inlet cavity (117), and low-pressure cavity (123) is communicated with by low-pressure cavity runner (110) with secondary depression chamber (119); Described controlling rod (120) also is provided with and is subjected to hydraulic pressure and resilient member (116) acting in conjunction to make controlling rod (120) produce reciprocating pressure-sensitive assembly; Controlling rod (120) lower end is provided with sealing supporting plate (102), and it is corresponding with the primary seal mouth of a river (104) that sealing supporting plate (102) is gone up set main seal ring (103); Controlling rod (120) upper end is provided with secondary water shutoff mouth (112), and corresponding with secondary seal ring (113); The water shutoff area at the primary seal mouth of a river (104) equates with the water shutoff area of secondary water shutoff mouth (112) or is approaching; The spacing of the primary seal mouth of a river (104) and secondary seal ring (113) equates with the spacing of main seal ring (103) and secondary water shutoff mouth (112); Described resilient member (116) is arranged in the secondary water-inlet cavity (117), and resilient member (116) two ends act on respectively on the inwall of controlling rod (120) upper end and valve upper cover (118); Controlling rod (120) to-and-fro motion constitute to the primary seal water assembly that forms current switching two states between water-inlet cavity (127) and the low-pressure cavity (123) and form secondary water-inlet cavity (117) and secondary depression chamber (119) between the control of secondary water shutoff assembly of current switching two states.
2. pressure-limit valve according to claim 1, it is characterized in that, described pressure-sensitive assembly is made of secondary pressure element (109) that bears secondary depression chamber (119) hydraulic pressure and the main pressure element (107) that bears low-pressure cavity (123) hydraulic pressure, and the area of contact in secondary pressure element (109) and secondary depression chamber (119) is less than the area of contact of main pressure element (107) with low-pressure cavity (123); Move cavity for pressure element between main pressure element (107) and the secondary pressure element (109).
3. pressure-limit valve according to claim 2, it is characterized in that, described secondary pressure element (109), top plate (108), main pressure element (107), bottom plate (106) are sleeved on controlling rod (120) successively and upward fasten by upper cap nut (105), secondary pressure element (109) periphery is fixed by loam cake (118), middle cover (121), and main pressure element (107) periphery is fixed by middle cover (121), valve seat (122).
4. pressure-limit valve according to claim 3, it is characterized in that, described secondary pressure element (109) and main pressure element (107) are made as integrative-structure with controlling rod (120), secondary pressure element (109) and main pressure element (107) are respectively equipped with seal ring (211), seal ring (211) periphery of secondary pressure element (109) contacts with loam cake (118) internal surface, and seal ring (211) periphery of main pressure element (107) contacts with valve seat (122) internal surface.
5. according to any described pressure-limit valve of claim 1 to 4, it is characterized in that described water outlet (114) is communicated with secondary depression chamber (119) by outlet passage.
6. according to any described pressure-limit valve of claim 1 to 4, it is characterized in that described water outlet (114) is communicated with low-pressure cavity (123) by outlet passage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720078915XU CN201013989Y (en) | 2007-03-29 | 2007-03-29 | Pressure-limiting valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU200720078915XU CN201013989Y (en) | 2007-03-29 | 2007-03-29 | Pressure-limiting valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201013989Y true CN201013989Y (en) | 2008-01-30 |
Family
ID=39025783
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU200720078915XU Expired - Fee Related CN201013989Y (en) | 2007-03-29 | 2007-03-29 | Pressure-limiting valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201013989Y (en) |
-
2007
- 2007-03-29 CN CNU200720078915XU patent/CN201013989Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20080130 |