CN110906028A

CN110906028A - Three-way valve structure

Info

Publication number: CN110906028A
Application number: CN201911364986.XA
Authority: CN
Inventors: 郭建恒; 王勇
Original assignee: GTC GAS TECHONOLOGY COMPONENTS Co Ltd
Current assignee: GTC GAS TECHONOLOGY COMPONENTS Co Ltd
Priority date: 2019-12-26
Filing date: 2019-12-26
Publication date: 2020-03-24

Abstract

The invention aims to provide a three-way valve structure which is simple in structure, long in service life, low in noise and good in sealing performance. The invention comprises a valve body, wherein a water inlet channel, a water outlet channel I, a water outlet channel II, a cavity and a sealing frame are arranged in the valve body, the water outlet channel I is communicated with an upper port of the cavity, the water outlet channel II is communicated with a lower port of the cavity, the water inlet channel is communicated with a side port of the cavity, the sealing frame comprises an upper sealing ring matched with the upper port of the cavity and a lower sealing ring matched with the lower port of the cavity, the upper sealing ring is connected with the lower sealing ring through a connecting sheet, the sealing frame is embedded on the cavity, a stretching assembly is arranged on the valve body and comprises a driving shaft, the lower end of the driving shaft penetrates through the sealing frame and is provided with an upper piston and a lower piston, the upper piston is positioned above the upper sealing ring and matched with the upper sealing ring, and the lower piston is positioned below the lower. The invention can be applied to the technical field of three-way valves.

Description

Three-way valve structure

Technical Field

The invention relates to the technical field of wall-mounted furnaces, in particular to a three-way valve structure.

Background

Generally, a three-way valve is configured to have three directions of an inlet and an outlet of a valve housing, and thus to switch a flow direction of a fluid passing through the inlet and the outlet according to movement of a valve body, and to selectively discharge the fluid flowing in through one inlet through the other two outlets.

The existing three-way valve structure usually adopts a valve core matched with a piston of an adaptive part, then the valve core drives the piston to plug a water outlet, so that conversion between different water outlets is realized, the application publication number CN 109424763A provides a three-way valve, the three-way valve realizes fluid flow direction control, the flow of fluid can be adjusted, the structure is simple, and the part cost is reduced. However, this patent also has the following disadvantages: when the valve is closed, the motion direction of the piston is consistent with the flow direction of water flow, negative pressure is generated immediately after the valve is closed, the piston is sucked violently, and therefore the piston is impacted to generate noise, and the service life of the piston is shortened; the valve body is integrally formed, errors are difficult to grasp, the assembly is not tight, and the problem of internal leakage is easy to occur.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a three-way valve structure which is simple in structure, long in service life, low in noise and good in sealing performance.

The technical scheme adopted by the invention is as follows: the invention comprises a valve body, wherein a water inlet channel, a water outlet channel I, a water outlet channel II, a cavity and a sealing frame are arranged in the valve body, the first water outlet channel is communicated with the upper port of the cavity, the second water outlet channel is communicated with the lower port of the cavity, the water inlet path is communicated with a side port of the cavity, the sealing frame comprises an upper sealing ring matched with an upper port of the cavity and a lower sealing ring matched with a lower port of the cavity, the upper sealing ring is connected with the lower sealing ring through a connecting sheet, the sealing frame is embedded on the cavity, a stretching assembly is arranged on the valve body and comprises a driving shaft, the lower end of the driving shaft penetrates through the sealing frame and is provided with an upper piston and a lower piston, the upper piston is positioned above the upper sealing ring and matched with the upper sealing ring, and the lower piston is positioned below the lower sealing ring and matched with the lower sealing ring.

Furthermore, an annular cavity communicated with the cavity is further arranged above the cavity, the first water outlet channel is communicated with the side end of the annular cavity, the lower end of the annular cavity is matched with the upper sealing ring, a matched supporting sealing ring is arranged at the upper end of the annular cavity, the supporting sealing ring is connected with the upper sealing ring through a connecting strip, a mounting opening is formed in the valve body and communicated with the annular cavity, a motor mounting seat is arranged on the mounting opening, the lower end of the motor mounting seat is matched with the mounting opening, the motor mounting seat is embedded in the valve body, a circular convex surface is arranged at the lower end of the motor mounting seat and matched with the supporting sealing ring, a matching groove is formed in the middle of the motor mounting seat, and the upper end of the driving shaft penetrates through the circular convex surface and is located in the matching groove, the lower extreme of drive shaft still is provided with down spacing card, lower spacing card is located the below of piston down and with lower piston cooperatees, be provided with the fixture block on the drive shaft, the fixture block is located the below of circular convex surface and with it cooperatees to go up the piston, tensile subassembly still establishes including the cover compression spring and the spring fastener of drive shaft upper end, compression spring with circular convex surface cooperatees, the spring fastener is located compression spring's top and with compression spring cooperatees, the upper end of drive shaft still is provided with upper spacing card, go up spacing card with the spring fastener cooperatees, the drive shaft is in with the setting driving motor transmission on the motor mount pad is connected in order to obtain drive power.

Further, be provided with down the circular slot on the lower sealing ring, be provided with the bottom suspension seal circle down on the circular slot, the bottom suspension seal circle with the lower port inner wall of cavity cooperatees, be provided with the circular slot on the last sealing ring, upward be provided with the upper seal circle on the circular slot, the upper seal circle with the upper port inner wall of cavity cooperatees, the lower extreme of motor mount pad is provided with the circle recess, be provided with the waterproof circle on the circle recess, the waterproof circle with the inner wall of installing port, the upper end of supporting the sealing ring cooperate.

Further, it establishes including integrated into one piece and all the cover to go up the piston drive epaxial last column section, last sealed one deck and last sealed two layers, go up sealed one deck with be provided with the mounting groove between the sealed two layers of going up, upward be provided with seal ring on the mounting groove, go up seal ring with go up the sealing ring and cooperate, down the piston includes integrated into one piece and all the cover establishes drive epaxial lower column section, lower sealed one deck and lower sealed two layers, lower sealed one deck with be provided with down the mounting groove down between the sealed two layers, be provided with seal ring down under the mounting groove, seal ring down with seal ring cooperatees down.

Further, the diameter of the upper sealing layer is smaller than or equal to that of the inner ring of the upper sealing ring, the diameter of the upper sealing layer is larger than that of the inner ring of the upper sealing ring, the diameter of the lower sealing layer is smaller than or equal to that of the inner ring of the lower sealing ring, and the diameter of the lower sealing layer is larger than that of the inner ring of the lower sealing ring.

Further, the lower end of the driving shaft is sleeved with an adjusting clamping piece, and the adjusting clamping piece is located between the upper piston and the lower piston.

Furthermore, go up the column section with all be provided with waterproof snap ring in the column section down.

Further, be provided with fixed annular on the motor mount pad, be provided with card hole and U type fastener on the valve body, U type fastener passes card hole with fixed annular groove matches will the motor mount pad is fixed on the valve body.

Furthermore, be provided with spacing arch on the circular convex surface, spacing arch with compression spring cooperatees, be provided with the piece that blocks on the drive shaft, the piece that blocks sets up on the spacing arch, be provided with waterproof ring in the circular convex surface, waterproof ring with block the piece and cooperate.

Furthermore, the first water outlet channel is provided with a first water outlet and a second water outlet, a plug matched with the second water outlet is arranged on the second water outlet, and the plug is matched with the first water outlet.

The invention has the beneficial effects that: because the structure of the invention adopts the valve body which is internally provided with the water inlet channel, the water outlet channel I, the water outlet channel II, the cavity and the sealing frame, the first water outlet channel is communicated with the upper port of the cavity, the second water outlet channel is communicated with the lower port of the cavity, the water inlet path is communicated with a side port of the cavity, the sealing frame comprises an upper sealing ring matched with an upper port of the cavity and a lower sealing ring matched with a lower port of the cavity, the upper sealing ring is connected with the lower sealing ring through a connecting sheet, the sealing frame is embedded on the cavity, a stretching assembly is arranged on the valve body and comprises a driving shaft, the lower end of the driving shaft penetrates through the sealing frame and is provided with an upper piston and a lower piston, the upper piston is positioned above the upper sealing ring and matched with the upper sealing ring, and the lower piston is positioned below the lower sealing ring and matched with the lower sealing ring. Compared with the closest prior art, the invention has the following advantages: the invention has reasonable integral design and simple structure; the upper piston and the lower piston move in a direction opposite to the flow direction of water flow, so that negative pressure cannot be generated when a water channel of water is changed, the noise is low, the service life of the piston is long, and the economical efficiency is good; adopt sealed frame and valve body matched with split type structure, can greatly reduce the error, sealed frame can be according to the actual conditions of valve body to the design, easily adjustment can obtain better leakproofness.

Drawings

FIG. 1 is a schematic view of the present invention in a partially cut-away perspective;

FIG. 2 is an enlarged view of the portion of the frame A in FIG. 1;

FIG. 3 is a schematic view in half section of the present invention;

FIG. 4 is a schematic perspective view of the present invention;

FIG. 5 is an exploded schematic view of a portion of the internal structure of the present invention;

FIG. 6 is an enlarged view of the portion of the frame B in FIG. 5;

FIG. 7 is a schematic view in half section of the present invention with internal structures removed;

fig. 8 is a schematic perspective view of the present invention with a driving motor.

Detailed Description

As shown in fig. 1 to 8, in this embodiment, the present invention includes a valve body 1, a water inlet passage 2, a water outlet passage one 3, a water outlet passage two 4, a cavity 5 and a sealing frame 6 are arranged in the valve body 1, the water outlet passage one 3 is communicated with an upper port of the cavity 5, the water outlet passage two 4 is communicated with a lower port of the cavity 5, the water inlet passage 2 is communicated with a side port of the cavity 5, the sealing frame 6 includes an upper sealing ring 61 adapted to the upper port of the cavity 5 and a lower sealing ring 62 adapted to the lower port of the cavity 5, the upper sealing ring 61 is connected to the lower sealing ring 62 through a connecting piece 60, the sealing frame 6 is embedded in the cavity 5, a stretching assembly is arranged on the valve body 1, the stretching assembly includes a driving shaft 71, a lower end of the driving shaft 71 passes through the sealing frame 6 and is provided with an upper piston 72 and a lower piston 73, the upper piston 72 is located above the upper sealing ring 61 and is engaged with the upper sealing ring 61, and the lower piston 73 is located below the lower sealing ring 62 and is engaged with the lower sealing ring 62. The water inlet channel 2, the water outlet channel I3, the water outlet channel II 4 and the cavity 5 are communicated with each other in the valve body 1 to form a complete water flow guide line, the sealing frame 6 is matched with the cavity 5, the sealing frame 6 comprises an upper sealing ring 61 and a lower sealing ring 62, and the upper sealing ring and the lower sealing ring are respectively tightly matched with the upper end and the lower end of the cavity 5, so that better sealing performance is obtained; a driving motor is externally connected to the upper end of the driving shaft 71 to obtain a driving force, the upper piston 72 is located above the upper sealing ring 61 and is tightly fitted with the upper sealing ring 61, the lower piston 73 is located below the lower sealing ring 62 and is tightly fitted with the lower sealing ring 62, therefore, the upper piston 72 controls the communication state of the water outlet path one 3 and the water inlet path 2, the lower piston 73 controls the communication state of the water outlet path two 4 and the water inlet path 2, and because the upper piston 72 and the lower piston 73 are both designed on the driving shaft 71, the upper piston 72 and the lower piston 73 simultaneously act, when the driving shaft 71 moves downwards, the upper piston 72 moves downwards and finally is tightly fitted with the upper sealing ring 61, the water outlet path one 3 is isolated from the cavity 5, and the lower piston 73 moves downwards, the water outlet channel II 4 is communicated with the cavity 5, and water flows out of the water outlet channel II 4; when the driving shaft 71 moves upwards, the lower piston 72 moves upwards and finally fits and clings to the lower sealing ring 62, the water outlet channel II 4 is isolated from the cavity 5, the upper piston 72 moves upwards, the water outlet channel I3 is communicated with the cavity 5, and water flows out of the water outlet channel I3. in addition, the invention can also control the stroke of the driving shaft 71 to keep the driving shaft at a fixed position, so that water flows out of the water outlet channel I3 and the water outlet channel II 4 simultaneously, namely when the upper piston 72 and the lower piston 73 do not contact the upper sealing ring 61 and the lower sealing ring 62 respectively, the water outlet channel I3 and the water outlet channel II 4 are both communicated with the cavity 5; as can be seen from the above, when the water outlet path of the valve body 1 needs to be changed, the driving shaft 71 needs to be driven to drive the upper piston 72 or the lower piston 73 to move, and the moving direction is opposite to the water flow direction, so that negative pressure is not generated, noise caused by sudden suction of the piston is avoided, the service life of the piston is prolonged, and economic benefits are improved; in addition, owing to adopted seal carrier 6 with valve body 1 matched with split type structure can avoid the problem that the precision is difficult to grasp to the cast integral type structure of an organic whole, can be according to valve body 1's particular case and make the looks adaptation seal carrier 6 to can possess better leakproofness, can effectively avoid the condition of interior hourglass.

In this embodiment, an annular cavity 8 communicated with each other is further provided above the cavity 5, the first water outlet channel 3 is communicated with the side end of the annular cavity 8, the lower end of the annular cavity 8 is adapted to the upper sealing ring 61, the upper end of the annular cavity 8 is provided with a supporting sealing ring 64 adapted to the annular cavity, the supporting sealing ring 64 is connected with the upper sealing ring 61 through a connecting strip 640, the valve body 1 is provided with a mounting port 11, the mounting port 11 is communicated with the annular cavity 8, the mounting port 11 is provided with a motor mounting seat 12, the lower end of the motor mounting seat 12 is adapted to the mounting port 11, the motor mounting seat 12 is embedded on the valve body 1, the lower end of the motor mounting seat 12 is provided with a circular convex surface 13, the circular convex surface 13 is adapted to the supporting sealing ring 64, and the middle part of the motor mounting seat 12 is provided with a matching groove 14, the upper end of the driving shaft 71 passes through the circular convex surface 13 and is located in the fitting groove 14, the lower end of the driving shaft 71 is further provided with a lower limit card 74, the lower limit card 74 is positioned below the lower piston 73 and is matched with the lower piston 73, a fixture block 75 is arranged on the driving shaft 71, the fixture block 75 is positioned below the circular convex surface 13 and is matched with the upper piston 72, the stretching assembly further comprises a compression spring 76 and a spring catch 77 which are sleeved on the upper end of the driving shaft 71, the compression spring 76 is matched with the circular convex surface 13, the spring clip 77 is positioned above the compression spring 76 and is matched with the compression spring 76, the upper end of the driving shaft 71 is further provided with an upper limit clamping piece 78, the upper limit clamping piece 78 is matched with the spring clamping piece 77, the driving shaft 71 is in transmission connection with a driving motor 100 provided on the motor mounting base 12 to obtain a driving force. The annular cavity 8 is used as a connecting cavity and is used for communicating the cavity 5 with the first water outlet channel 3, the supporting sealing ring 64 connected with the upper sealing ring 61 is arranged in the annular cavity 8, the supporting sealing ring 64 is matched with the mounting port 11, so that the motor mounting seat 12 can be better mounted, the mounting can be facilitated, and meanwhile, the sealing performance can be ensured, the circular convex surface 13 is matched with the supporting sealing ring 64 and can be embedded into the supporting sealing ring 64, and the matching groove 14 is arranged so as to facilitate the matching of the driving shaft 71 and other components; the lower limit clamping piece 74 is used for limiting the position of the lower piston 73, and when the lower piston 73 needs to be disassembled and replaced, the lower piston 73 can be taken out and replaced by disassembling the lower limit clamping piece 74, so that the maintenance is convenient, the fixture block 75 is positioned between the circular convex surface 13 and the conveying device 72, the fixture block 75 is used for limiting the position of the upper piston 72, and the fixture block is matched with the lower limit clamping piece 74 to lock the two pistons so as to fix the two pistons on the driving shaft 71; the compression spring 76 and the spring clamping piece 77 are matched to support the driving shaft 71, so that the water outlet passage I3 is communicated in a conventional state, the driving shaft 71 is externally connected with the driving motor 100 to obtain driving force, the installation can be more flexibly realized, the space flexibility is high, and different motors can be replaced according to different conditions to meet the working requirements.

In this embodiment, be provided with down circular slot 63 on the lower sealing ring 62, be provided with lower seal circle 64 on the circular slot 63 down, lower seal circle 64 with the lower port inner wall of cavity 5 cooperatees, be provided with circular slot 65 on the last sealing ring 61, upward be provided with sealing washer 66 on the circular slot 65, go up sealing washer 66 with the upper port inner wall of cavity 5 cooperatees, the lower extreme of motor mount pad 12 is provided with circle recess 15, be provided with waterproof ring 16 on the circle recess 15, waterproof ring 16 with the inner wall of installing port 11, the upper end of supporting seal ring 64 cooperate. The lower sealing ring 64, the upper sealing ring 66 and the waterproof ring 16 are all elastic, the diameter of the outer ring of the lower sealing ring 64 is larger than that of the lower sealing ring 62, and when the lower sealing ring 64 is installed and matched, the lower sealing ring 64 is stressed and compressed and is tightly attached to the inner wall of the lower port of the cavity 5, so that a sealing effect is realized, and water circulation is isolated; similarly, the diameter of the outer ring of the upper sealing ring 66 is larger than that of the upper sealing ring 61, and when the upper sealing ring 66 is installed and matched, the upper sealing ring is stressed and compressed and is tightly attached to the inner wall of the upper port of the cavity 5, so that the sealing effect is realized, and water circulation is isolated; also in a similar way, the diameter of the outer ring of the waterproof ring 16 is larger than that of the lower end of the motor mounting seat 12, when the waterproof ring 16 is mounted and matched, the waterproof ring 16 is compressed under stress and tightly attached to the inner wall of the mounting block 11 and the upper end surface of the supporting sealing ring 64, so that the sealing effect is realized, and water circulation is isolated. It is seen by the aforesaid, this project organization is sealed effectual, and leak protection water ability is strong.

In this embodiment, the upper piston 72 includes an upper cylindrical section 721, an upper first sealing layer 722, and an upper second sealing layer 723 that are integrally formed and all fitted over the driving shaft 71, an upper mounting groove 724 is provided between the upper first sealing layer 722 and the upper second sealing layer 723, an upper sealing gasket 725 is provided on the upper mounting groove 724, the upper sealing gasket 725 is engaged with the upper sealing ring 61, the lower piston 73 includes a lower cylindrical section 731, a lower first sealing layer 732, and a lower second sealing layer 733 that are integrally formed and all fitted over the driving shaft 71, a lower mounting groove 734 is provided between the lower first sealing layer 732 and the lower second sealing layer 733, a lower sealing gasket 734 is provided under the lower mounting groove 734, and the lower sealing gasket 735 is engaged with the lower sealing ring 735 62. The upper sealing ring 725 and the lower sealing ring 735 are elastic, the diameter of the outer ring of the upper sealing washer 725 is larger than the upper sealing layer 722 and the upper sealing layer 723, and when the upper sealing washer is matched with the upper sealing ring 61, the upper sealing washer 725 is compressed under force and is in close contact with the upper sealing ring 61 to realize sealing and cut off water flow; the diameter of the outer ring of the lower sealing washer 735 is larger than the lower sealing layer 733 and the lower sealing layer 733, and when the lower sealing washer 735 is matched with the lower sealing ring 61, the lower sealing washer 735 is compressed by force and is tightly contacted with the lower sealing ring 61 to realize sealing, so that water flow is blocked.

In the present invention, the diameter of the upper sealing layer 722 is smaller than or equal to the diameter of the inner ring of the upper sealing ring 61, the diameter of the upper sealing layer 723 is larger than the diameter of the inner ring of the upper sealing ring 61, the diameter of the lower sealing layer 732 is smaller than or equal to the diameter of the inner ring of the lower sealing ring 62, and the diameter of the lower sealing layer 733 is larger than the diameter of the inner ring of the lower sealing ring 62. The diameters of the upper sealing second layer 723 and the lower sealing second layer 733 are larger than the diameters of the corresponding matched sealing rings, so that a limiting effect can be achieved, the upper sealing second layer 723 and the lower sealing second layer 733 cannot pass through the corresponding matched sealing rings during movement, the situation that the sealing performance is reduced due to the fact that the driving shaft 71 drives the upper sealing second layer 723 and the lower sealing second layer 733 to be too long in movement distance can be prevented, a good working effect can be guaranteed, and a certain prevention effect is achieved.

In the present invention, an adjustment jaw 79 is sleeved on the lower end of the driving shaft 71, and the adjustment jaw 79 is located between the upper piston 72 and the lower piston 73. The adjusting clamping piece 79 is used for adjusting the distance between the upper piston 72 and the lower piston 73, can flexibly adapt to the length of the cavity 5 and the sealing rack 6, and can increase or reduce the number of the adjusting clamping pieces 79 or change the thickness of the adjusting clamping pieces 79 to adjust the distance between the two pistons when needed, so that the working matching is better realized.

In the present invention, a waterproof snap ring 9 is disposed in each of the upper cylindrical section 721 and the lower cylindrical section 731. The waterproof snap ring 9 can enhance the sealing performance of the structure and prevent water from leaking from the inside.

In the invention, a fixed ring groove 17 is arranged on the motor mounting seat 12, a clamping hole 18 and a U-shaped clamping piece 19 are arranged on the valve body 1, and the U-shaped clamping piece 19 passes through the clamping hole 18 to be matched with the fixed ring groove 17 to fix the motor mounting seat 12 on the valve body 1. The U-shaped clamping piece 19 is matched with the fixing ring groove 17, when the motor installation seat 12 is installed, the motor installation seat 12 is inserted into the installation opening 11, the fixing ring groove 17 and the clamping hole 18 are opposite to each other, then the U-shaped clamping piece 19 is inserted into the clamping hole 18 on one side of the valve body 1 and continues to be pushed until the U-shaped clamping piece 19 penetrates through the clamping hole 18 on the other side of the valve body 1, and at the moment, the motor installation seat 12 is fixed on the valve body 1 by the U-shaped clamping piece 19. The structure can be conveniently disassembled and assembled, and is beneficial to maintenance and part replacement. In addition, the valve body 1 is further provided with a buckle, the buckle is matched with the U-shaped clamping piece 19 and used for limiting the position of the U-shaped clamping piece 19 and preventing the U-shaped clamping piece 19 from displacing or falling off due to vibration or other conditions to influence the installation of the motor installation seat 12. It should be noted that the driving motor 100 also adopts a U-shaped fastener structure to match with the motor mounting base 12, so as to achieve the quick replacement of the motor, thereby adapting to different driving requirements.

In the invention, the circular convex surface 13 is provided with a limiting bulge 20, the limiting bulge 20 is matched with the compression spring 76, the driving shaft 71 is provided with a stop block 21, the stop block 21 is arranged on the limiting bulge 20, the circular convex surface 13 is internally provided with a waterproof ring 22, and the waterproof ring 22 is matched with the stop block 21. Compression spring 76 with spacing arch 20 looks adaptation can make compression spring 76 receives the restriction, can not take place the displacement when the action, guarantees the stability of work, waterproof ring 22 can prevent water infiltration, guarantees sealed effect, stop block 21 and be used for restricting waterproof ring 22's position, make it be in correct operating position, play waterproof role.

In the invention, the water outlet channel I3 is provided with a water outlet I21 and a water outlet II 22, the water outlet II 22 is provided with a plug 23 matched with the water outlet I21, and the plug 23 is matched with the water outlet I21. The water outlet channel I3 is provided with two ports, the water outlet channel II 22 is kept in a normally open state and used for water outlet, the plug 23 is arranged on the water outlet channel I21 and used for blocking the water outlet channel I21 so that water cannot flow out, and when the water outlet of the water outlet channel I3 needs to be changed, the plug 23 is transferred to the water outlet channel II 22 from the water outlet channel I21, so that the change of the water outlet is realized, and the water outlet direction of the water flow is changed.

Furthermore, the upper sealing ring 61, the lower sealing ring 62, the connecting strip 60, the support sealing ring 64 and the connecting strip 640 are integrally formed, i.e. the sealing carrier 6 is integrally formed.

While the embodiments of the present invention have been described in terms of practical embodiments, they are not to be construed as limiting the meaning of the present invention, and modifications of the embodiments and combinations with other embodiments will be apparent to those skilled in the art in light of the present description.

Claims

1. A three-way valve structure, includes valve body (1), its characterized in that: the water inlet pipeline (2), the water outlet pipeline (3), the water outlet pipeline (4), the cavity (5) and the sealing frame (6) are arranged in the valve body (1), the water outlet pipeline (3) is communicated with an upper port of the cavity (5), the water outlet pipeline (4) is communicated with a lower port of the cavity (5), the water inlet pipeline (2) is communicated with a side port of the cavity (5), the sealing frame (6) comprises an upper sealing ring (61) matched with the upper port of the cavity (5) and a lower sealing ring (62) matched with the lower port of the cavity (5), the upper sealing ring (61) is connected with the lower sealing ring (62) through a connecting sheet (60), the sealing frame (6) is embedded on the cavity (5), a stretching assembly is arranged on the valve body (1) and comprises a driving shaft (71), the lower end of the driving shaft (71) penetrates through the sealing frame (6) and is provided with an upper piston (72) and a lower piston (73), the upper piston (72) is located above the upper sealing ring (61) and matched with the upper sealing ring (61), and the lower piston (73) is located below the lower sealing ring (62) and matched with the lower sealing ring (62).

2. A three-way valve structure according to claim 1, characterized in that: the upper part of the cavity (5) is also provided with a communicated annular cavity (8), the water outlet way I (3) is communicated with the side end of the annular cavity (8), the lower end of the annular cavity (8) is matched with the upper sealing ring (61), the upper end of the annular cavity (8) is provided with a supporting sealing ring (64) matched with the annular cavity, the supporting sealing ring (64) is connected with the upper sealing ring (61) through a connecting strip (640), the valve body (1) is provided with a mounting port (11), the mounting port (11) is communicated with the annular cavity (8), the mounting port (11) is provided with a motor mounting seat (12), the lower end of the motor mounting seat (12) is matched with the mounting port (11), the motor mounting seat (12) is embedded on the valve body (1), and the lower end of the motor mounting seat (12) is provided with a circular convex surface (13), circular convex surface (13) with support sealing ring (64) looks adaptation, the middle part of motor mount pad (12) is provided with cooperation groove (14), the upper end of drive shaft (71) is passed circular convex surface (13) and is located in cooperation groove (14), the lower extreme of drive shaft (71) still is provided with down spacing card (74), down spacing card (74) are located the below of lower piston (73) and with piston (73) cooperate down, be provided with fixture block (75) on drive shaft (71), fixture block (75) are located the below of circular convex surface (13) and with cooperate in last piston (72), tensile subassembly still including the cover establish compression spring (76) and spring fastener (77) of drive shaft (71) upper end, compression spring (76) with circular convex surface (13) cooperate, the spring clamping piece (77) is located above the compression spring (76) and matched with the compression spring (76), an upper limiting clamping piece (78) is further arranged at the upper end of the driving shaft (71), the upper limiting clamping piece (78) is matched with the spring clamping piece (77), and the driving shaft (71) is in transmission connection with a driving motor arranged on the motor mounting seat (12) to obtain driving force.

3. A three-way valve structure according to claim 2, characterized in that: be provided with down circular slot (63) on lower sealing ring (62), be provided with down sealing washer (64) on circular slot (63) down, down sealing washer (64) with the lower port inner wall of cavity (5) cooperatees, be provided with circular slot (65) on last sealing ring (61), upward be provided with on circular slot (65) sealing washer (66), go up sealing washer (66) with the upper port inner wall of cavity (5) cooperatees, the lower extreme of motor mount pad (12) is provided with circle recess (15), be provided with on circle recess (15) waterproof circle (16), waterproof circle (16) with the inner wall of installing port (11), the upper end of supporting seal ring (64) cooperate.

4. A three-way valve structure according to claim 1, characterized in that: the upper piston (72) comprises an upper cylindrical section (721), an upper sealing layer (722) and an upper sealing layer (723) which are integrally formed and are all sleeved on the driving shaft (71), an upper mounting groove (724) is arranged between the upper sealing layer (722) and the upper sealing layer (723), an upper sealing gasket (725) is arranged on the upper mounting groove (724), the upper sealing gasket (725) is matched with the upper sealing ring (61), the lower piston (73) comprises a lower cylindrical section (731), a lower sealing layer (732) and a lower sealing layer (733) which are integrally formed and are all sleeved on the driving shaft (71), a lower mounting groove (734) is arranged between the lower sealing layer (732) and the lower sealing layer (733), and a lower sealing gasket (735) is arranged below the lower mounting groove (734), and the lower sealing gasket (735) is matched with the lower sealing ring (62).

5. A three-way valve structure according to claim 4, characterized in that: the diameter of the upper sealing layer (722) is smaller than or equal to that of the inner ring of the upper sealing ring (61), the diameter of the upper sealing layer (723) is larger than that of the inner ring of the upper sealing ring (61), the diameter of the lower sealing layer (732) is smaller than or equal to that of the inner ring of the lower sealing ring (62), and the diameter of the lower sealing layer (733) is larger than that of the inner ring of the lower sealing ring (62).

6. A three-way valve structure according to claim 1, characterized in that: an adjusting clamping piece (79) is sleeved at the lower end of the driving shaft (71), and the adjusting clamping piece (79) is located between the upper piston (72) and the lower piston (73).

7. A three-way valve structure according to claim 5, characterized in that: and waterproof snap rings (9) are arranged in the upper cylindrical section (721) and the lower cylindrical section (731).

8. A three-way valve structure according to claim 2, characterized in that: be provided with fixed annular groove (17) on motor mount pad (12), be provided with card hole (18) and U type fastener (19) on valve body (1), U type fastener (19) pass card hole (18) with fixed annular groove (17) cooperate with will motor mount pad (12) are fixed on valve body (1).

9. A three-way valve structure according to claim 2, characterized in that: be provided with spacing arch (20) on circular convex surface (13), spacing arch (20) with compression spring (76) cooperatees, be provided with on drive shaft (71) and block piece (21), block piece (21) and set up on spacing arch (20), be provided with waterproof ring (22) in circular convex surface (13), waterproof ring (22) with block piece (21) and cooperate.

10. A three-way valve structure according to claim 1, characterized in that: the water outlet channel I (3) is provided with a water outlet I (21) and a water outlet II (22), a plug (23) matched with the water outlet II (22) is arranged on the water outlet II, and the plug (23) is matched with the water outlet I (21).