CN110630782B - Two-stage pilot valve type water diversion valve core and water diversion valve - Google Patents
Two-stage pilot valve type water diversion valve core and water diversion valve Download PDFInfo
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- CN110630782B CN110630782B CN201911086911.XA CN201911086911A CN110630782B CN 110630782 B CN110630782 B CN 110630782B CN 201911086911 A CN201911086911 A CN 201911086911A CN 110630782 B CN110630782 B CN 110630782B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 400
- 239000011258 core-shell material Substances 0.000 claims abstract description 40
- 230000007246 mechanism Effects 0.000 claims abstract description 39
- 230000009471 action Effects 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 25
- 238000013016 damping Methods 0.000 claims description 20
- 238000006073 displacement reaction Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 3
- 238000010586 diagram Methods 0.000 description 5
- 230000008859 change Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/10—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit
- F16K11/14—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with two or more closure members not moving as a unit operated by one actuating member, e.g. a handle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/122—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston
- F16K31/1225—Actuating devices; Operating means; Releasing devices actuated by fluid the fluid acting on a piston with a plurality of pistons
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Multiple-Way Valves (AREA)
Abstract
The invention discloses a two-stage pilot valve type water diversion valve core and a water diversion valve, wherein the water diversion valve core comprises a valve core shell, a switching mechanism, a first piston and a second piston, the valve core shell is provided with a water inlet, a first water outlet and a second water outlet, the first piston and the second piston are respectively arranged on the valve core shell in a sliding manner, the first piston controls whether the first water outlet is communicated with the water inlet or not under the action of pressure difference, the second piston controls whether the second water outlet is communicated with the water inlet or not under the action of pressure difference, and the first water outlet and the second water outlet alternately discharge water; the switching mechanism is arranged on the valve core shell and is used for cooperating with the first piston to receive the reverse pressure difference, the second piston is connected with the first piston and is used for cooperating with the second piston to receive the reverse pressure difference. The invention can reduce the probability of failure condition that the water diversion valve core is opened and closed simultaneously under the condition of low water pressure, thereby improving the working stability of the water diversion valve core.
Description
Technical Field
The invention relates to a water diversion valve core, in particular to a two-stage pilot valve type water diversion valve core and a water diversion valve.
Background
The pilot valve type water diversion valve core mainly comprises two types, wherein one type is used for controlling water outlet of only one waterway, the other type is used for controlling water outlet of two waterways to be switched, and for the pilot valve type water diversion valve core capable of controlling water outlet of two waterways to be switched, linkage control is realized by matching two pistons with a sealing rod, specifically, the two pistons are mirror images, and the pressure difference born by each piston is controlled by the same sealing rod to be changed, so that the switching of waterways is realized. The two pistons formed by the pilot valve type water diversion valve core are in a parallel connection relationship in practice and are mutually independent to form a primary pilot valve type structure. Therefore, under the condition of low water pressure, if one piston cannot move due to large friction force (caused by scale, dirt accumulation and the like), and the other piston can move normally, a failure state that two waterways are simultaneously opened or closed can occur.
Disclosure of Invention
The invention aims at solving the technical problems existing in the prior art and provides a two-stage pilot valve type water diversion valve core and a water diversion valve.
The technical scheme adopted for solving the technical problems is as follows: the valve core shell is provided with a water inlet, a first water outlet and a second water outlet, the first piston and the second piston are respectively arranged on the valve core shell in a sliding mode, the first piston controls whether the first water outlet is communicated with the water inlet or not under the action of pressure difference, the second piston controls whether the second water outlet is communicated with the water inlet or not under the action of pressure difference, and the first water outlet and the second water outlet alternately discharge water; the switching mechanism is arranged on the valve core shell and is used for cooperating with the first piston to receive the reverse pressure difference, the second piston is connected with the first piston and is used for cooperating with the second piston to receive the reverse pressure difference.
Further, the switching mechanism and the first piston have relative displacement in the axial direction, and the switching mechanism can push or pull up the first piston; and/or the first piston and the second piston have relative displacement in the axial direction, and the first piston can push or pull the second piston.
Further, the first piston and the valve core shell enclose a first water pressure cavity, the first water pressure cavity is provided with a first pressure relief hole and a first damping hole communicated with the water inlet, and the first piston controls whether the water inlet is communicated with the first water outlet or not under the action of pressure difference along with whether the first pressure relief hole is opened or not; the second piston is arranged along the axial direction of the first piston and encloses a second water pressure cavity with the valve core shell, and the second water pressure cavity is provided with a second pressure relief hole and a second damping hole communicated with the water inlet; the first piston and the second piston are positioned between the first water pressure cavity and the second water pressure cavity; the switching mechanism can be operated to control whether the first pressure relief hole is opened or not, and the first piston controls whether the second pressure relief hole is opened or not.
Further, a connecting rod is arranged at one end of the first piston along the axial direction of the first piston, a sealing part for opening or closing the second pressure relief hole is arranged on the connecting rod, and the connecting rod penetrates through the second piston.
Further, a gap between the connecting rod and the second piston forms the second damping hole; the upper part of the second piston is separated from the lower part, the upper part is used for controlling whether the water inlet is communicated with the second water outlet, the second water pressure cavity is defined between the lower part and the valve core shell, the second pressure relief hole is formed in the lower part of the second piston, and the sealing part is positioned in the second water pressure cavity.
Further, the first piston is opposite to the first pressure relief hole, and the first piston further comprises a first elastic piece, wherein the first elastic piece is located in the first water pressure cavity and abuts against between the first piston and one end of the first water pressure cavity, where the first pressure relief hole is formed.
Further, the switching mechanism comprises a switching rod, the switching rod is arranged on the valve core shell and penetrates through the first pressure relief hole, and the switching rod opens or closes the first pressure relief hole along with axial movement of the switching rod; the switching rod also passes through the first piston, and a gap between the switching rod and the first piston forms the first damping hole.
Further, the switching mechanism further comprises a key assembly and a second elastic piece, wherein the key assembly is arranged on the valve core shell, and the second elastic piece is matched between the key assembly and the valve core shell; the key assembly is connected with the switching rod and can be pressed to realize the switching between the two states of bouncing and pressing.
Further, the key assembly comprises a key shell and a rotating ring, the key shell is sleeved outside the valve core shell and is connected with the switching rod, the second elastic piece is propped between the valve core shell and the key shell, the rotating ring can be rotatably sleeved in the key shell around the axis of the switching rod and is matched with a rotating switching structure between the rotating ring and the valve core shell, and therefore when the key shell is pressed, the switching of the two states is achieved.
Further, the rotary switching structure comprises a plurality of first tooth blocks, a plurality of second tooth blocks and a plurality of third tooth blocks, wherein the first tooth blocks are circumferentially distributed on the inner side wall of the rotary ring, the second tooth blocks are circumferentially distributed on the outer side wall of the valve core shell, an access groove is formed between every two adjacent first tooth blocks, the second tooth blocks and the third tooth blocks are axially staggered, and the second tooth blocks are located above the third tooth blocks; when the key shell is pressed, the first tooth block is matched with the second tooth block and the third tooth block in sequence, and when the first tooth block is clamped below the second tooth block, the switching mechanism moves downwards to a first position, and when the first tooth block and the second tooth block are staggered, the switching mechanism resets upwards to a second position through the second elastic piece.
Further, the top of the first tooth block is respectively provided with a left upper tooth peak and a right upper tooth peak, the bottom of the first tooth block is provided with a first guiding tooth peak, a left lower tooth peak and a right lower tooth peak which are positioned at the inner sides of the first guiding tooth peak, and the bottoms of the two lower tooth peaks are higher than the bottoms of the first guiding tooth peak; the top of the second tooth block is provided with a second guiding tooth peak, the bottom of the second tooth block is provided with a first guiding inclined plane, the top of the third tooth block is provided with a second guiding inclined plane, and the inclination directions of the first guiding inclined plane and the second guiding inclined plane are opposite; the upper tooth peak and the lower tooth peak are both helical, the inclination direction of the upper tooth peak is the same as that of the first guide inclined plane, and the inclination direction of the lower tooth peak is the same as that of the second guide inclined plane.
Further, the valve core shell comprises an outer shell and an inner shell, the side wall of the outer shell is provided with the water inlet, the first water outlet and the second water outlet, the inner shell is arranged in the outer shell, the first piston is arranged in the inner shell in a sliding manner, and the first piston and the second piston enclose the first water pressure cavity; the second piston is arranged in the shell in a sliding manner, and the second piston enclose the second water pressure cavity; the switching mechanism is arranged at the top of the shell; the shell is internally provided with a first annular water stop table and a second annular water stop table, the first piston is matched with the first annular water stop table to control whether the first water outlet is communicated with the water inlet or not, and the second piston is matched with the second annular water stop table to control whether the second water outlet is communicated with the water inlet or not; the inner diameter of the first annular water stop table is larger than that of the second annular water stop table.
Further, in a state that the first piston is separated from the first annular water stop table, the pressure bearing areas at two ends of the first piston are equal, and in a state that the first piston is contacted with the first annular water stop table, the pressure bearing area at one end of the first piston, which is contacted with the first annular water stop table, is smaller than the pressure bearing area at the other end of the first piston; and in a state that the second piston is in contact with the second annular water stop table, the pressure bearing area of one end of the second piston, which is in contact with the second annular water stop table, is smaller than that of the other end, and in a state that the second piston is separated from the second annular water stop table, the pressure bearing areas of the two ends of the second piston are equal. The invention further provides a water diversion valve, which comprises a valve body and a water diversion valve core, wherein the valve body is provided with a water inlet waterway, a first water outlet waterway and a second water outlet waterway; the water diversion valve core adopts the two-stage pilot valve type water diversion valve core, a water inlet waterway is communicated with the water inlet, a first water outlet waterway is communicated with the first water outlet and the first pressure relief hole, or the first pressure relief hole is communicated with the first water outlet, and a first water outlet waterway is communicated with the first water outlet; the second water outlet waterway is communicated with the second water outlet and the second pressure relief hole, or the second pressure relief hole is communicated with the second water outlet, and the second water outlet waterway is communicated with the second water outlet.
Compared with the prior art, the invention has the following beneficial effects:
1. Because the direction of the pressure difference received by the first piston is controlled by the switching mechanism in a linkage way, and the direction of the pressure difference received by the second piston is controlled by the second piston in a linkage way, the two pilot valve structures formed by the invention are in a series connection relation to form a secondary pilot valve structure, and the second piston can be controlled to move only when the first piston moves, namely, under the condition of low water pressure, if the first piston does not move due to friction force, the second piston can not move, so that the invention can reduce the probability of failure condition that two paths of water outlet are simultaneously opened and closed under the condition of low water pressure, thereby improving the working stability of the water diversion valve core.
2. The switching mechanism can push or pull the first piston, and the first piston can push or pull the second piston, so that the first piston and the second piston can be driven to move to achieve a descaling effect on the periphery of the first piston and the periphery of the second piston, and the situation that the first piston and the second piston cannot move due to large friction force under the condition of low water pressure is avoided, so that the failure condition that the water diversion valve core is opened and closed simultaneously under the condition of low water pressure is completely eradicated.
3. The first piston is matched with the second piston through the connecting rod and the sealing part, so that the structure is very simple, and the assembly is convenient.
4. The switching mechanism further comprises a key assembly and a second elastic piece, the switching rod can be driven to realize the switching between the two states of bouncing and pressing, and particularly, the key assembly comprises a key shell and a rotating ring, the structural design is ingenious, the working state is stable, and faults are not easy to occur.
The invention is described in further detail below with reference to the drawings and examples; the two-stage pilot valve type water diversion valve core and the water diversion valve are not limited to the embodiment.
Drawings
FIG. 1 is an exploded schematic view of a diverter valve cartridge of the present invention;
FIG. 2 is a schematic view of the structure of the first piston of the present invention;
FIG. 3 is a schematic view of the structure of the base of the present invention;
FIG. 4 is a schematic view of the structure of the second piston of the present invention;
FIG. 5 is a bottom view of the second piston of the present invention;
FIG. 6 is an exploded view of the key assembly of the present invention;
FIG. 7 is a cross-sectional view of a rotating ring of the present invention;
FIG. 8 is a schematic structural view of the upper shell of the present invention;
FIG. 9 is a schematic view of the overall structure of the water diversion valve core of the present invention;
FIG. 10 is a schematic view of the state of the water distribution valve cartridge of the present invention (in section);
FIG. 11 is a schematic diagram of the state of the water diversion valve core of the present invention II (cross section);
FIG. 12 is a schematic view of a water distribution valve cartridge of the present invention in a third (cross-sectional) state;
FIG. 13 is a schematic view of a water diversion valve core of the present invention in a state four (cross-sectional view);
FIG. 14 is a schematic view of a water diversion valve core of the present invention in a fifth (cross-sectional) state;
FIG. 15 is a schematic view of a water distribution valve cartridge of the present invention in a sixth (cross-sectional) state;
FIG. 16 is a schematic view of a water distribution valve cartridge of the present invention in a seventh (cross-sectional) state;
FIG. 17 is a schematic diagram of a state change of the rotary switching structure according to the present invention;
FIG. 18 is a second schematic diagram of a state change of the rotary switching structure according to the present invention;
FIG. 19 is a schematic view (in section) of the diverter valve of the present invention;
fig. 20 is a second schematic view of the state of the diverter valve of the present invention.
Detailed Description
1-20, The secondary pilot valve type water diversion valve core of the present invention includes a valve core housing 2, a switching mechanism 1, a first piston 3, and a second piston 4, wherein the valve core housing 2 is provided with a water inlet 231, a first water outlet 232, and a second water outlet 233, the first piston 3 and the second piston 4 are slidably disposed on the valve core housing 2 along the same direction, the first piston 3 and the second piston 4 are distributed up and down, the first piston 3 is controlled by pressure difference to control whether the first water outlet 232 is communicated with the water inlet 231, the second piston 4 is controlled by pressure difference to control whether the second water outlet 233 is communicated with the water inlet 231, and the first water outlet 232 and the second water outlet 233 alternately discharge water; the switching mechanism 1 is arranged on the valve core shell 2 and is used for cooperating with the first piston 3 to receive reverse pressure difference, namely, the pressure difference received by the first piston 3 after being interlocked is opposite to the pressure difference received by the first piston before being interlocked; the second piston 4 is connected with the first piston 3, and the second piston 4 is linked to receive the reverse pressure difference, namely the pressure difference received by the second piston 4 after being linked is opposite to the pressure difference received by the second piston before being linked. The pressure difference received by the first piston 3 includes the pressure difference of water received by two ends of the first piston 3 in the axial direction. The pressure difference received by the second piston 4 includes the pressure difference of water received by both ends of the second piston 4 in the axial direction.
In this embodiment, the switching mechanism 1 and the first piston 3 have relative displacement in the axial direction (i.e., the switching mechanism 1 can move a certain distance in the axial direction relative to the first piston 3, and similarly, the first piston 3 can move a certain distance in the axial direction relative to the switching mechanism 1), and the switching mechanism 1 can push or pull up the first piston 3. The first piston 3 and the second piston 4 have relative displacement in the axial direction (i.e., the first piston can move a certain distance along the axial direction relative to the second piston, and the second piston can move a certain distance along the axial direction relative to the first piston), so that the first piston 3 can push or pull the second piston 4.
In this embodiment, the first piston 3 and the valve core housing 2 enclose a first hydraulic chamber 6, the first hydraulic chamber 6 has a first pressure relief hole 62 for discharging water to the outside of the valve core housing 2, and a first damping hole 61 for communicating with the water inlet 231, and with the opening or non-opening of the first pressure relief hole 62, the first piston 3 is controlled by the pressure difference to control whether the water inlet 231 is communicated with the first water outlet 232. The second piston 4 and the valve core housing 2 enclose a second water pressure chamber 7, the second water pressure chamber 7 has a second pressure relief hole 72 capable of discharging water to the outside of the valve core housing 2, and a second damping hole 71 communicating with the water inlet 231, and the second piston 4 is controlled by the pressure difference to control whether the water inlet 231 is communicated with the second water outlet 233 along with whether the second pressure relief hole 72 is opened or not. The switching mechanism 1 can be operated to control whether the first pressure relief hole 62 is opened or not, so that the first piston 3 is linked to receive the reverse pressure difference; the first piston 3 controls whether the second relief hole 72 is opened or not, so that the second piston 4 is subjected to a reverse pressure difference in linkage. The second relief hole 72 is closed as the water inlet 231 communicates with the first water outlet 232, and the second relief hole 72 is opened as the water inlet 231 is disconnected from the first water outlet 232. The first piston 3 and the second piston 4 are positioned between the first hydraulic pressure chamber 6 and the second hydraulic pressure chamber 7.
In this embodiment, a connecting rod 34 is disposed at one end of the first piston 3 along the axial direction thereof, a sealing portion 5 for opening or closing the second pressure release hole 72 is disposed on the connecting rod 34, and the connecting rod 34 passes through the second piston 4. The first piston 3 specifically comprises a first piston support 32, an upper Y-shaped ring 31 and an upper sealing gasket 33, the bottom end of the first piston support 32 is connected with the top end of a connecting rod 34, and the upper Y-shaped ring 31 is sleeved outside the top of the first piston support 32 and is used for being in sealing fit with the inner side wall of the valve core shell 2 to form the first water pressure cavity 6; the upper sealing pad 33 is sleeved outside the bottom of the first piston support 32 and is used for being matched with a first annular water stopping platform 234 to be described below, so that whether the first water outlet 232 is communicated with the water inlet 231 or not is controlled. The sealing part 5 specifically comprises a secondary sealing gasket 51 and a secondary sealing backing plate 52, which are sleeved at the bottom end of the connecting rod 34 and are limited by a split washer 53 sleeved at the bottom end of the connecting rod 34.
In this embodiment, the gap between the connecting rod 34 and the second piston 4 forms the second damping hole 71; the upper part of the second piston 4 is separated from the lower part, the upper part is used for controlling whether the water inlet 231 is communicated with the second water outlet 233, the second water pressure cavity 7 is enclosed between the lower part and the valve core shell 2, the second pressure relief hole 72 is arranged at the lower part of the second piston 4, and the sealing part 5 is positioned in the second water pressure cavity 7. The second piston 4 specifically includes a second piston support 42, a lower Y-ring 43, and a lower sealing pad 41, where the second piston support 42 includes two parts spaced up and down, and the lower sealing pad 41 is sleeved on the upper portion of the second piston support 42 and is used to cooperate with a second annular water stop 235 described below, so as to control whether the second water outlet 233 is communicated with the water inlet 231. The lower Y-shaped ring 43 is sleeved on the lower part of the second piston support 42 and is used for being in sealing fit with the inner side wall of the valve core shell 2 to form the second water pressure cavity 7. The connecting rod 34 passes through the second piston support 42, the lower part of the second piston support 42 is provided with the second pressure relief hole 72, the top end of the upper part of the second piston support 42 is provided with a radial upper water passing groove 421, and the bottom end of the lower part of the second piston support 42 is provided with a radial lower water passing groove 422. When the second pressure relief hole 72 is sealed by the sealing part 5, water enters the second water pressure cavity 7 from the upper water passing groove 421 to the second damping hole 71 to the lower water passing groove 422. The connecting rod 34 specifically includes a first rod segment 341, a second rod segment 342, and a third rod segment 343 sequentially distributed from top to bottom, the diameter of the first rod segment 341 is greater than that of the second rod segment 342, the diameter of the second rod segment 342 is greater than that of the third rod segment 343, the sealing part 5 is sleeved on the third rod segment 343 of the connecting rod 34, the second piston 4 is sleeved on the second rod segment 342 of the connecting rod 34, and the second piston 4 can axially move on the second rod segment 342 by a certain distance.
In this embodiment, the valve core housing 2 includes an outer housing and an inner housing 22, the side wall of the outer housing is provided with the water inlet 231, the first water outlet 232, and the second water outlet 233, the inner housing 22 is disposed in the outer housing, the first piston 3 is slidably disposed in the inner housing 22, and the first piston and the second piston enclose the first water pressure chamber 6; the second piston 4 is slidably arranged in the shell, and the second piston and the shell enclose the second water pressure cavity 7; the switching mechanism 1 is arranged at the top of the shell; a first annular water stop table 234 and a second annular water stop table 235 are arranged in the shell and are positioned between the first piston 3 and the second piston 4, the first piston 3 is matched with the first annular water stop table 234 to control whether the first water outlet 232 is communicated with the water inlet 231 or not, and the second piston 4 is matched with the second annular water stop table 235 to control whether the second water outlet 233 is communicated with the water inlet 231 or not; the inner diameter of the first annular water stop 234 is larger than the inner diameter of the second annular water stop 235. The outer shell specifically comprises an upper shell 21, a lower shell 24 and a base 23, the side wall of the base 23 is provided with the water inlet 231, a first water outlet 232 and a second water outlet 233, the upper shell 21 is connected to the top of the base 23, and the inner shell 22 is arranged in the upper shell 21; the lower shell 24 is connected to the bottom of the base 23, the second piston 4 is slidably disposed in the base 23, and the second piston and the lower shell 24 enclose the second hydraulic chamber 7; the switching mechanism 1 is provided in the upper case 21. The valve core housing 2 (specifically, the upper case 21 of the valve core housing 2) is provided with a third water outlet 213 communicating with the first pressure relief hole 62, so that the water flowing out through the first pressure relief hole 62 flows out through the third water outlet 213, but not limited thereto, in other embodiments, the first pressure relief hole communicates with the first water outlet, so that the water flowing out through the first pressure relief hole flows out through the first water outlet. The second pressure relief hole 72 is communicated with the second water outlet 233, so that the water flowing out of the second pressure relief hole 72 flows out through the second water outlet 233, but not limited thereto, in other embodiments, the valve core housing (specifically, the base or the lower shell of the valve core housing is provided with a fourth water outlet communicated with the second pressure relief hole, so that the water flowing out of the second pressure relief hole flows out through the fourth water outlet.) the valve core housing 2 (specifically, the base 23 of the valve core housing 2) is provided with an annular filter screen 25, and the water flowing into the water inlet 231 is filtered.
In this embodiment, in a state in which the first piston 3 is separated from the first annular water stop 234, the bearing areas 3a and 3b at the two ends of the first piston 3 are equal, and in a state in which the first piston 3 is in contact with the first annular water stop 234, the bearing area 3c at one end of the first piston 3 in contact with the first annular water stop 234 is smaller than the bearing area 3a at the other end; in a state where the second piston 4 is in contact with the second annular water stop 235, the pressure-bearing area 4a of one end of the second piston 4 in contact with the second annular water stop 235 is smaller than the pressure-bearing area 4b of the other end, and in a state where the second piston 4 is separated from the second annular water stop 235, the pressure-bearing areas 4c and 4b of the two ends of the second piston 4 are equal. The bearing area refers to the area of the portion of each end face of the first piston 3/second piston 4 that is in contact with water (for receiving the pressure of water).
In this embodiment, the first piston 3 is opposite to the first pressure relief hole 62, and the present invention further includes a first elastic member 8, where the first elastic member 8 is located in the first hydraulic chamber 6 and abuts between the first piston 3 and an end of the first hydraulic chamber 6 where the first pressure relief hole 62 is provided. The first elastic member 8 is specifically a spring.
In this embodiment, the switching mechanism 1 includes a switching lever 18, where the switching lever 18 is disposed on the valve core housing 2 and passes through the first pressure relief hole 62, and as the switching lever 18 moves in the axial direction, the switching lever 18 opens or closes the first pressure relief hole 62. Specifically, an O-ring 63 is sleeved in the first pressure relief hole 62, and the O-ring 63 is limited by a pressure cap 64 with a side capable of discharging water. The switching lever 18 is provided with a small diameter section 182, when the small diameter section 182 is far away from the sealing ring 63, the first pressure relief hole 62 is closed, and when the small diameter section 182 enters the sealing ring 63, the first pressure relief hole 62 is opened. The switching lever 18 also passes through the first piston 3 with a gap therebetween constituting the first damping hole 61. The lower part of the first piston 3 (specifically, the first piston support 32) is provided with a limit support 321 with a side surface capable of being flushed, and when the bottom end of the switching rod 18 contacts the bottom end of the limit support 321, the switching rod 18 can push the first piston 3 downwards; the bottom end of the switching rod 18 is provided with a split ring 181, the first piston 3 (specifically, the first piston bracket 32) is provided with an annular limiting boss 322, and the limiting boss 322 is positioned above the split ring 181 and limits the split ring 181 to pass upwards; when the circlip 181 contacts the stop boss 322, the switch lever 18 may pull the first piston 3 upward.
In this embodiment, the switching mechanism 1 further includes a key assembly and a second elastic member 17, where the key assembly is disposed on the valve core housing 2, and the second elastic member 17 is matched therebetween; the key assembly is connected to the switch lever 18, and the key assembly can be pressed to switch between the two states of being sprung and being depressed 8. The key assembly comprises a key shell and a rotating ring 15, the key shell is sleeved outside an upper shell 21 of the valve core shell 2 and is connected with the switching rod 18, the switching rod 18 passes through the upper shell 21 in a sealing mode, a second elastic piece 17 abuts against the position between the valve core shell 2 and the key shell, the rotating ring 15 can be sleeved in the key shell in a rotating mode around the axis of the switching rod 18, and a rotating switching structure is matched between the rotating ring 15 and the valve core shell 2, so that when the key shell is pressed, switching between the two states is achieved. The second elastic member 17 is specifically a spring, and is sleeved outside the switching lever 18. The key shell specifically comprises a key upper cover 13 and a key lower cover 16, the key upper cover 13 and the key lower cover 16 are in buckle connection, the key upper cover 13 is connected with the switching rod 18, specifically, the top of the switching rod 18 penetrates through the key upper cover 13 and is positioned by using the two split collars 12 and 14, the rotating ring 15 is sleeved in the key lower cover 16, and the second elastic piece 17 specifically abuts against the position between the upper shell 21 of the valve core shell 2 and the key upper cover 13. The button upper cover 13 is provided with a dome spring 11 for providing pressing sound and hand feeling. The second elastic member 17 has an elastic force greater than that of the first elastic member 8.
In this embodiment, the rotation switching structure includes a plurality of first tooth blocks 151 circumferentially distributed on the inner side wall of the rotary ring 15, a plurality of second tooth blocks 211 circumferentially distributed on the outer side wall of the valve core housing 2 (specifically, the upper housing 21), and a plurality of third tooth blocks 212, an access slot 152 is formed between adjacent first tooth blocks 151, the second tooth blocks 211 and the third tooth blocks 212 are axially staggered, and the second tooth blocks 211 are located above the third tooth blocks 212; when the key shell is pressed, the first tooth block 151 is matched with the second tooth block 211 and the third tooth block 212 in sequence, and when the first tooth block 151 is clamped below the second tooth block 211, the switching mechanism 1 moves downwards to a first position, namely, a position corresponding to the pressed state, and when the first tooth block 151 and the second tooth block 211 are staggered, the switching mechanism 1 resets upwards to a second position, namely, a position corresponding to the sprung state through the second elastic piece 17.
In this embodiment, the top of the first tooth block 151 has two upper left and right tooth peaks 1511, a first guiding tooth peak 1512 is disposed at the bottom of the first tooth block 151, and two lower left and right tooth peaks 1513 located inside the first guiding tooth peak 1512, and the bottom ends of the two lower tooth peaks 1513 are higher than the bottom ends of the first guiding tooth peak 1512; a second guiding tooth peak 2111 is arranged at the top of the second tooth block 211, a first guiding inclined plane 2112 is arranged at the bottom of the second tooth block 211, a second guiding inclined plane 2121 is arranged at the top of the third tooth block 212, and the inclination directions of the first guiding inclined plane 2112 and the second guiding inclined plane 2121 are opposite; the upper and lower peaks 1511, 1513 are beveled, and the upper and lower peaks 1511, 1513 are beveled in the same direction as the first and second guide beveled surfaces 2112, 2121. The first guide peak 1512 and the second guide peak 2111 are substantially saw-tooth-shaped.
In the secondary pilot valve type water diversion valve core, the initial state is that the first pressure relief hole 62 is opened, the second pressure relief hole 72 is closed, the first water outlet 232 is communicated with the water inlet 231, the second water outlet 233 is disconnected from the water inlet 231, as shown in fig. 10, at this time, the key assembly and the switching rod 18 are in a sprung state under the action of the second elastic member 17, water enters the first water pressure cavity 6 through the first damping hole 61 and rapidly flows out of the first pressure relief hole 62, so that the water pressure in the first water pressure cavity 6 is smaller than the water pressure on the water inlet side, the water pressure on the lower end of the first piston 3 is larger than the water pressure on the upper end due to the fact that the pressure bearing areas 3a and 3b on the upper end and the lower end of the first piston 3 are the same, in addition, the elastic force of the second elastic member 17 is larger than the elastic force of the first elastic member 8, the second elastic member 17 acts on the first piston 3 through the switching rod 18, therefore, the first piston 3 is kept separated from the first annular water stopping table 234 under the upward water pressure difference and the upward acting force of the switching rod 18, and water flows out through the first water outlet 232. Since the second pressure relief hole 72 is closed, water enters the second water pressure chamber 7 through the second damping hole 71 and is accumulated in the second water pressure chamber 7 until the water pressure in the second water pressure chamber 7 is the same as the water pressure on the water inlet side, and since the pressure bearing area 4a at the upper end of the second piston 4 is smaller than the pressure bearing area 4b at the lower end, the second piston 4 receives an upward pressure difference between the water pressure and the upward force of the first piston 3, and maintains a state of being in contact with the second annular water stop table 235, thereby maintaining the second water outlet 233 in a state of not discharging water. The water pressure refers to the pressure of water, and the same applies.
When the key assembly is pressed, as shown in fig. 11, the second elastic member 17 is compressed, the switching lever 18 moves downward, at this time, the first pressure release hole 62 is closed by the switching lever 18, water enters the first hydraulic chamber 6 through the first damping hole 61 and gathers in the first hydraulic chamber 6 until the hydraulic pressure in the first hydraulic chamber 6 is the same as the hydraulic pressure on the water inlet side, and since the pressure bearing areas 3a, 3b at the upper and lower ends of the first piston 3 are the same, the first piston 3 starts to move downward by a downward pressure difference (the pressure difference=the elastic force of the first elastic member 8), thereby opening the second pressure release hole 72, as shown in fig. 12. If the first elastic piece 8 fails, the first piston 3 can be pushed to move downwards by the switching rod 18, so that the reliability and stability of the function of the water diversion valve core are ensured. Since the second piston 4 has a certain movement stroke in the axial direction with respect to the first piston 3, when the first piston 3 starts to move down, the second piston 4 is also subjected to an upward pressure difference and does not move down with the first piston 3. When the first piston 3 moves down to open the second relief hole 72 with respect to the second piston 4 and starts pushing the second piston 4, the first piston 3 contacts the first annular water stop 234, and thus, the first water outlet 232 does not discharge water, as shown in fig. 13. At this time, the pressure-bearing area 3a of the upper end of the first piston 3 is larger than the pressure-bearing area 3c of the lower end, and thus the first piston 3 is subjected to a downward pressure difference (this pressure difference=the water pressure received by the upper end of the first piston 3+the elastic force of the first elastic member 8-the water pressure received by the lower end of the first piston 3) to remain in contact with the first annular water stop 234. The water slowly flows into the second water pressure cavity 7 through the second damping hole 71 and rapidly flows out through the second pressure relief hole 72, so that the water pressure in the second water pressure cavity 7 is reduced. In the downward moving process of the second piston 4, the bearing areas 4c and 4b at the upper end and the lower end of the second piston 4 are equal, and the water pressure born by the upper end of the second piston 4 is greater than the water pressure born by the lower end, so that the second piston 4 is acted by a downward water pressure difference and a downward pushing force of the first piston 3. After the second piston 4 moves down to the position, the bearing areas 4c and 4b at the upper end and the lower end of the second piston 4 are kept equal, the second pressure relief hole 72 is still in the open state, but at this time, the area of the gap between the second pressure relief hole 72 and the auxiliary sealing pad 51 is equal to the area of the second damping hole 71, so that the water pressure at the bearing area at the upper end of the second piston 4 is equal to the water pressure at the bearing area at the lower end, and the second piston 4 is in the stress balance state, so that the second piston is kept at the position, as shown in fig. 13. At this time, the second water outlet 233 of the water diversion valve core discharges water, and the entire switching mechanism 1 is kept in a depressed state as shown in fig. 14.
When the key assembly is pressed down again, as shown in fig. 15, the key assembly is sprung up by the restoring force of the second elastic member 17, and the switching rod 18 is pulled up to open the first pressure release hole 62, as shown in fig. 16, at this time, the pressure bearing area 3a at the upper end of the first piston 3 is larger than the pressure bearing area 3c at the lower end, and since the inner diameter of the first annular water stop table 234 is larger than the inner diameter of the second annular water stop table 235, the pressure bearing area 3c is larger than the pressure bearing area 4a, and therefore, in the transition state where the first pressure release hole 62 and the second pressure release hole 72 are opened simultaneously, the upward pressure difference suffered by the first piston 3 is larger than the downward pressure difference suffered by the second piston 4, so that the whole of the first piston 3 and the second piston 4 is subjected to an upward pressure difference, and the upward acting force of the switching rod 18 on the first piston 3 is added, thereby ensuring the stability of the switching function of the water distribution valve core. The water slowly flows into the first water pressure chamber 6 through the first damping hole 61 and rapidly flows out through the first pressure relief hole 62, so that the water pressure in the first water pressure chamber 6 is reduced. In the upward movement of the first piston 3, the pressure-bearing area 3a of the upper end of the first piston 3 is equal to the pressure-bearing area 3b of the lower end, so that the water pressure received by the upper end of the first piston 3 is smaller than the water pressure received by the lower end, the first piston 3 moves under the upward pressure difference and the upward force of the switching lever 18, and is separated from the first annular water stop 234, and the water flows out through the first water outlet 232. The second piston 4 starts to move upwards against other acting forces under the upward acting force of the first piston 3 until the first piston 3 drives the auxiliary sealing gasket 51 to seal the second pressure relief hole 72, and the second piston 4 contacts the second annular water stop 235. Since the second pressure relief hole 72 is closed, water enters the second water pressure chamber 7 through the second damping hole 71 and is accumulated in the second water pressure chamber 7 until the water pressure in the second water pressure chamber 7 is the same as the water pressure on the water inlet side, and since the pressure bearing area 4a at the upper end of the second piston 4 is smaller than the pressure bearing area 4b at the lower end, the second piston 4 is kept in contact with the second annular water stop table 235 by an upward pressure difference and an upward acting force of the first piston 3, so that the second water outlet 233 cannot discharge water. At this time, the entire water diversion valve core returns to the initial state as shown in fig. 10.
According to the secondary pilot valve type water diversion valve core, the initial state of the key assembly is assumed to be the bouncing state. When the key assembly is pressed, the first guide teeth peak 1512 of the first teeth block 151 of the rotary ring 15 contacts with the second guide teeth peak 2111 of the second teeth block 211, as shown in the small a diagram of fig. 17, and the rotary ring 15 rotates clockwise (or can be anticlockwise) by a certain angle, so that the second teeth block 211 is in a yielding position corresponding to the access slot 152 on the rotary ring 15, and the key assembly continues to move downwards, as shown in the small b diagram of fig. 17. As the key assembly moves downward, the lower peaks 1513 of the first tooth block 151 contact the second guide inclined surface 2121 of the third tooth block 212, as shown in fig. 17 c, and the rotating ring 15 rotates counterclockwise by a certain angle, so that the third tooth block 212 is caught between the two lower peaks 1513 of the first tooth block 151, as shown in fig. 17 d, and at this time, the key assembly moves downward. When the key assembly is released, the key assembly is moved upward by the second elastic member 17 by a certain distance to separate the third tooth block 212 from the first tooth block 151, and the upper tooth peak 1511 of the first tooth block 151 contacts the first guide inclined surface 2112 of the second tooth block 211, as shown in fig. 17 e, the rotary ring 15 continues to rotate counterclockwise by a certain angle until the second tooth block 211 is clamped between the two upper tooth peaks 1511 of the first tooth block 151, as shown in fig. 17 f, thereby limiting the key assembly from continuing to move upward, and at this time, the entire key assembly is in a depressed state, and in this state, the switching lever 18 moves downward and closes the first pressure release hole.
When the key assembly is pressed again, the first tooth block 151 is separated from the second tooth block 211 as shown in the a-plot of fig. 18, and when the first guide tooth peak 1512 of the first tooth block 151 contacts the second guide inclined surface 2121 of the third tooth block 212, the rotary ring 15 is rotated counterclockwise by a certain angle as shown in the b-plot of fig. 18. The state in which the key assembly is pressed into place is shown in the c-plot of fig. 18. When the key assembly is released, the key assembly is moved upward by the second elastic member 17 by a certain distance, so that the upper tooth peak 1511 of the first tooth block 151 contacts with the first guide inclined surface 2112 of the second tooth block 211, as shown in fig. 18 d, the rotating ring 15 rotates counterclockwise by a certain angle again until the second tooth block 211 is in a yielding position corresponding to the access slot 152 on the rotating ring 15, as shown in fig. 18 e, and at this time, the key assembly is moved upward by the first elastic member 8, as shown in fig. 18 f, so that the key assembly returns to the sprung state, in which the switching lever 18 moves upward and opens the first pressure release hole 62.
According to the secondary pilot valve type water diversion valve core, as the change of the pressure difference of the first piston 3 is controlled by the switching mechanism 1 and the change of the pressure difference of the second piston 4 is controlled by the second piston 4, the two pilot valve structures formed by the secondary pilot valve type water diversion valve core are in a series connection relationship to form the secondary pilot valve structure, and the second piston 4 can be controlled to move only when the first piston 3 moves, so that the second piston 4 can not move under the condition of low water pressure if the first piston 3 does not move due to friction force, and the probability of failure of simultaneous opening and closing of two paths of water outlets of the water diversion valve core under the condition of low water pressure can be reduced by half, and the working stability of the water diversion valve core is improved.
The switching mechanism 1 can push or pull the first piston 3, and the first piston 3 can push or pull the second piston 4, so that the descaling effect can be achieved on the periphery of the first piston 3 and the periphery of the second piston 4 by driving the first piston 3 and the second piston 4 to move, the situation that the first piston 3 and the second piston 4 cannot move due to large friction force under the condition of low water pressure is avoided, and the failure condition that the water distribution valve core is opened and closed simultaneously under the condition of low water pressure is completely eradicated.
Referring to fig. 19 and 20, the water diversion valve of the present invention includes a valve body 9 and a water diversion valve core 10, wherein the valve body 9 is provided with a water inlet waterway 91, a first water outlet waterway 92 and a second water outlet waterway 93; the water diversion valve core 10 adopts a two-stage pilot valve type water diversion valve core of the invention. The water inlet channel 91 is connected to the water inlet 231, the first water outlet channel 92 is connected to the first water outlet 232 and the first pressure relief hole 62, and the first water outlet channel 92 is connected to the first water outlet 232 and the third water outlet because the first pressure relief hole 62 is connected to the third water outlet, but not limited thereto, and in other embodiments, the first pressure relief hole is connected to the first water outlet, and the first water outlet channel is connected to the first water outlet. The second water outlet channel 93 is connected to the second water outlet 233 and the second pressure relief hole 72, and the second water outlet channel 93 is connected to the second water outlet 233 only by connecting the second water outlet 233, but not limited thereto, and in other embodiments, the second pressure relief hole is separated from the second water outlet, and the second water outlet channel is connected to the second water outlet and the second pressure relief hole.
In the water diversion valve of the present invention, a water outlet state is shown in fig. 19, at this time, the first water outlet channel 92 is for water outlet, and the second water outlet channel 93 is closed; the other water outlet state is shown in fig. 20, and at this time, the first water outlet channel 92 does not discharge water, and the second water outlet channel 93 discharges water.
The above embodiment is only used for further explaining a secondary pilot valve type water diversion valve core and a secondary pilot valve type water diversion valve of the present invention, but the present invention is not limited to the embodiment, and any simple modification, equivalent variation and modification to the above embodiment according to the technical substance of the present invention falls within the protection scope of the technical solution of the present invention.
Claims (13)
1. The valve core shell is provided with a water inlet, a first water outlet and a second water outlet, the first piston and the second piston are respectively arranged on the valve core shell in a sliding mode, the first piston controls whether the first water outlet is communicated with the water inlet or not under the action of pressure difference, the second piston controls whether the second water outlet is communicated with the water inlet or not under the action of pressure difference, and the first water outlet and the second water outlet alternately discharge water; the method is characterized in that: the switching mechanism is arranged on the valve core shell and is used for cooperating with the first piston to receive the reverse pressure difference, the second piston is connected with the first piston and is used for cooperating with the second piston to receive the reverse pressure difference.
2. The two-stage pilot valve water diversion valve spool of claim 1, wherein: the switching mechanism and the first piston have relative displacement in the axial direction, and the switching mechanism can push or pull the first piston; and/or the first piston and the second piston have relative displacement in the axial direction, and the first piston can push or pull the second piston.
3. The two-stage pilot valve water diversion valve spool according to claim 1 or 2, characterized in that: the first piston and the valve core shell enclose a first water pressure cavity, and the first water pressure cavity is provided with a first pressure relief hole and a first damping hole communicated with the water inlet; the second piston is arranged along the axial direction of the first piston and encloses a second water pressure cavity with the valve core shell, and the second water pressure cavity is provided with a second pressure relief hole and a second damping hole communicated with the water inlet; the first piston and the second piston are positioned between the first water pressure cavity and the second water pressure cavity; the switching mechanism can be operated to control whether the first pressure relief hole is opened or not, and the first piston controls whether the second pressure relief hole is opened or not.
4. The two-stage pilot valve water diversion valve spool as set forth in claim 3, wherein: one end of the first piston is provided with a connecting rod along the axial direction of the first piston, the connecting rod is provided with a sealing part for opening or closing the second pressure relief hole, and the connecting rod penetrates through the second piston;
The gap between the connecting rod and the second piston forms the second damping hole; the upper part of the second piston is separated from the lower part, the upper part is used for controlling whether the water inlet is communicated with the second water outlet, the second water pressure cavity is defined between the lower part and the valve core shell, the second pressure relief hole is formed in the lower part of the second piston, and the sealing part is positioned in the second water pressure cavity.
5. The two-stage pilot valve water diversion valve spool as set forth in claim 3, wherein: the first piston is opposite to the first pressure relief hole, and further comprises a first elastic piece, wherein the first elastic piece is positioned in the first water pressure cavity and abuts against the first piston and one end of the first water pressure cavity, which is provided with the first pressure relief hole.
6. The two-stage pilot valve water diversion valve spool as set forth in claim 3, wherein: the switching mechanism comprises a switching rod, the switching rod is arranged on the valve core shell, penetrates through the first pressure relief hole, and opens or closes the first pressure relief hole along with axial movement of the switching rod; the switching rod also passes through the first piston, a gap between the first piston and the switching rod forms the first damping hole, and the first piston and the switching rod have relative displacement in the axial direction.
7. The two-stage pilot valve water diversion valve spool as set forth in claim 6, wherein: the switching mechanism also comprises a key assembly and a second elastic piece, wherein the key assembly is arranged on the valve core shell, and the second elastic piece is matched between the key assembly and the valve core shell; the key assembly is connected with the switching rod and can be pressed to realize the switching between the two states of bouncing and pressing.
8. The two-stage pilot valve water diversion valve spool as set forth in claim 7, wherein: the key assembly comprises a key shell and a rotating ring, the key shell can be sleeved outside the valve core shell in an axially movable mode and is connected with the switching rod, the second elastic piece is propped between the valve core shell and the key shell, the rotating ring can be sleeved in the key shell in a rotating mode around the axis of the switching rod and is matched with a rotating switching structure between the rotating ring and the valve core shell, and therefore when the key shell is pressed, switching of the two states is achieved.
9. The two-stage pilot valve water diversion valve spool as set forth in claim 8, wherein: the rotary switching structure comprises a plurality of first tooth blocks, a plurality of second tooth blocks and a plurality of third tooth blocks, wherein the first tooth blocks are circumferentially distributed on the inner side wall of the rotary ring, the second tooth blocks are circumferentially distributed on the outer side wall of the valve core shell, an access groove is formed between every two adjacent first tooth blocks, the second tooth blocks and the third tooth blocks are axially staggered, and the second tooth blocks are positioned above the third tooth blocks; when the key shell is pressed, the first tooth block is matched with the second tooth block and the third tooth block in sequence, and when the first tooth block is clamped below the second tooth block, the switching mechanism moves downwards to a first position, and when the first tooth block and the second tooth block are staggered, the switching mechanism resets upwards to a second position through the second elastic piece.
10. The two-stage pilot valve water diversion valve spool as set forth in claim 9, wherein: the top of the first tooth block is provided with a left upper tooth peak and a right upper tooth peak respectively, the bottom of the first tooth block is provided with a first guiding tooth peak, and a left lower tooth peak and a right lower tooth peak which are positioned at the inner sides of the first guiding tooth peak, and the bottom ends of the two lower tooth peaks are higher than the bottom ends of the first guiding tooth peak; the top of the second tooth block is provided with a second guiding tooth peak, the bottom of the second tooth block is provided with a first guiding inclined plane, the top of the third tooth block is provided with a second guiding inclined plane, and the inclination directions of the first guiding inclined plane and the second guiding inclined plane are opposite; the upper tooth peak and the lower tooth peak are both helical, the inclination direction of the upper tooth peak is the same as that of the first guide inclined plane, and the inclination direction of the lower tooth peak is the same as that of the second guide inclined plane.
11. The two-stage pilot valve water diversion valve spool as set forth in claim 3, wherein: the valve core shell comprises an outer shell and an inner shell, the side wall of the outer shell is provided with the water inlet, the first water outlet and the second water outlet, the inner shell is arranged in the outer shell, the first piston is arranged in the inner shell in a sliding manner, and the first piston and the second piston enclose the first water pressure cavity; the second piston is arranged in the shell in a sliding manner, and the second piston enclose the second water pressure cavity; the switching mechanism is arranged at the top of the shell; a first annular water stop table and a second annular water stop table are arranged in the shell and are positioned between the first piston and the second piston, the first piston is matched with the first annular water stop table to control whether the first water outlet is communicated with the water inlet or not, and the second piston is matched with the second annular water stop table to control whether the second water outlet is communicated with the water inlet or not; the inner diameter of the first annular water stop table is larger than that of the second annular water stop table.
12. The two-stage pilot valve water diversion spool as set forth in claim 11, wherein: in a state that the first piston is separated from the first annular water stop table, the bearing areas at the two ends of the first piston are equal, and in a state that the first piston is contacted with the first annular water stop table, the bearing area at one end of the first piston, which is contacted with the first annular water stop table, is smaller than the bearing area at the other end of the first piston; and in a state that the second piston is in contact with the second annular water stop table, the pressure bearing area of one end of the second piston, which is in contact with the second annular water stop table, is smaller than that of the other end, and in a state that the second piston is separated from the second annular water stop table, the pressure bearing areas of the two ends of the second piston are equal.
13. A water diversion valve comprises a valve body and a water diversion valve core, wherein the valve body is provided with a water inlet waterway, a first water outlet waterway and a second water outlet waterway; the method is characterized in that: the water diversion valve core adopts the two-stage pilot valve type water diversion valve core as claimed in any one of claims 3-12, a water inlet waterway is communicated with the water inlet, a first water outlet waterway is communicated with the first water outlet and a first pressure relief hole, or the first pressure relief hole is communicated with the first water outlet, and a first water outlet waterway is communicated with the first water outlet; the second water outlet waterway is communicated with the second water outlet and the second pressure relief hole, or the second pressure relief hole is communicated with the second water outlet, and the second water outlet waterway is communicated with the second water outlet.
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| CN105805363B (en) * | 2016-05-31 | 2018-01-16 | 福建西河卫浴科技有限公司 | A kind of multistage single dual control flow control valve valve |
| JP6632503B2 (en) * | 2016-09-30 | 2020-01-22 | 株式会社不二工機 | Control valve for variable displacement compressor |
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