CN110630780B

CN110630780B - Leakage-free self-sealing electric four-way valve

Info

Publication number: CN110630780B
Application number: CN201911144871.XA
Authority: CN
Inventors: 贾培育
Original assignee: Yantai Jia You Electronic Machinery Technology Co Ltd
Current assignee: Yantai Jia You Electronic Machinery Technology Co Ltd
Priority date: 2019-11-21
Filing date: 2019-11-21
Publication date: 2020-02-18
Anticipated expiration: 2039-11-21
Also published as: CN110630780A

Abstract

A leakage-free self-closing electric four-way valve is characterized in that a valve body is provided with a left reducing sleeve, a left hollow piston is arranged on the inner side of the left reducing sleeve, a left small valve port is formed at the right end of the left hollow piston, and the left hollow piston axially moves on the inner side of the left reducing sleeve; the right end of the inner side of the valve body is provided with a right reducing sleeve, the inner side of the right reducing sleeve is provided with a right hollow piston, the left end of the right hollow piston is provided with a right small valve port, and the right hollow piston axially moves inside the right reducing sleeve. The inside axial flow pipe that is equipped with of valve body, the left side of axial flow pipe is equipped with left little valve plate and left big valve plate. The right side of the axial flow pipe is provided with a right small valve plate and a right large valve plate, the right end of the axial flow pipe is connected with a right baffle plate, and the right side wall of the axial flow pipe and the right baffle plate are provided with a plurality of right drainage channels; the middle part of the right baffle plate is provided with a driving transition sleeve, the driving transition sleeve is internally connected with a driving rod, the middle part of the power supporting plate is provided with a through hole, and the driving rod is led out from the through hole and extends to the inner center of the axial flow pipe. The invention changes the flow direction of the fluid, has no leakage and strong impurity resistance.

Description

Leakage-free self-sealing electric four-way valve

Technical Field

The invention relates to a leakage-free self-sealing electric four-way valve, belonging to the technical field of valves.

Background

The four-way valve is a core component in the field of air-conditioning refrigeration, plays a role in automatically converting cold and heat in an air-conditioning refrigeration system, can change the flowing direction of a refrigerant in a pipeline, and realizes the switching of functions such as refrigeration, heating or defrosting.

The existing four-way valve at least has the following problems:

firstly, the four-way valve has large leakage amount, and because the four-way valve is connected with high pressure and low pressure at the same time, the large leakage amount causes energy loss and the energy efficiency is low;

secondly, the four-way valve has poor impurity resistance, and impurities are inevitable in production, so that the four-way valve fails due to the absence of the impurity resistance;

thirdly, as intelligent control is popularized more and more, PLC control is more and more extensive, the existing four-way valve has no feedback, the state of the four-way valve cannot be monitored, and fault diagnosis cannot be carried out; and the existing four-way valve has large fluid resistance. A new four-way valve technical scheme is needed urgently.

Disclosure of Invention

Aiming at the defects in the prior art, the invention provides a leakage-free self-sealing electric four-way valve, which solves the problems of large leakage, poor impurity resistance, no feedback and the like of the conventional four-way valve.

The technical scheme for solving the technical problems is as follows: a leakage-free self-sealing electric four-way valve comprises a valve body, a left valve cover and a right valve cover, wherein the left valve cover and the right valve cover are respectively connected to two ends of the valve body; a high-pressure channel is formed on the outer side of the left valve cover;

the left end of the inner side of the valve body is provided with a left reducing sleeve, the inner side of the left reducing sleeve is provided with a left hollow piston, the right end of the left hollow piston is provided with a left small valve port, and the left hollow piston axially moves to the inner side of the left reducing sleeve; the right end of the inner side of the valve body is provided with a right reducing sleeve, the inner side of the right reducing sleeve is provided with a right hollow piston, the left end of the right hollow piston is provided with a right small valve port, and the right hollow piston axially moves to the inner side of the right reducing sleeve;

the two sides of the low-pressure channel are reduced towards the inner side of the valve body and are provided with a left large valve port and a right large valve port; an axial flow pipe is arranged in the valve body, a left small valve plate and a left large valve plate are arranged on the left side of the axial flow pipe, and the left small valve plate is positioned on the outer side of the left large valve plate; the right side of the axial flow pipe is provided with a right small valve plate and a right large valve plate, and the right small valve plate is positioned on the outer side of the right large valve plate;

the right end of the axial flow pipe is connected with a right baffle, and a plurality of right drainage channels are arranged on the right side wall of the axial flow pipe and the right baffle; the middle part of the right baffle plate is provided with a driving transition sleeve, the inside of the driving transition sleeve is connected with a driving rod, the right side of the driving rod is provided with a power supporting plate, the middle part of the power supporting plate is provided with a through hole, and the driving rod is led out from the through hole and extends to the inner center of the axial flow pipe;

the right side of the power supporting plate is connected with a gland, the right side of the gland is connected with a driving unit, and an output shaft of the driving unit is connected with the driving rod.

As a preferred scheme of the leakage-free self-sealing electric four-way valve, the valve body is inwardly reduced in diameter at two sides of the low-pressure channel, the left small valve plate is matched with the left small valve port through movement, and the left large valve plate is matched with the left large valve port through movement;

the right small valve plate is matched with the right small valve port through movement, and the right large valve plate is matched with the right large valve port through movement.

As a preferred scheme of the leakage-free self-sealing electric four-way valve, the driving transition sleeve is provided with an internal thread, the driving rod is provided with an external thread, and the internal thread of the driving transition sleeve is matched with the external thread of the driving rod;

the right end of the driving rod is expanded and is arranged in the through hole, the caliber of the right side of the through hole is larger than that of the left side of the through hole, the gland is positioned on the right side of the through hole, and the gland and the through hole limit the driving rod to move left and right;

an output shaft of the driving unit is connected with the driving rod, and a leading-out wire of the driving unit is led out from the middle position of the right valve cover through a terminal board.

As a preferred scheme of the leakage-free self-sealing electric four-way valve, the joint of the power supporting plate and the valve body is sealed, and the joint of the driving rod and the power supporting plate is sealed; and a maintenance valve is arranged between the power supporting plate and the valve body.

As a preferred scheme of the leakage-free self-sealing electric four-way valve, the middle part of the right valve cover protrudes outwards to form a shielding cavity, the rotor part of the driving unit is a magnetic coupling inner rotor which is arranged in the shielding cavity, and the stator part of the driving unit is sleeved on the periphery of the right valve cover.

As a preferred scheme of the leakage-free self-sealing electric four-way valve, the gland is connected to the inner side of the right valve cover, the driving rod is led out from the middle of the right valve cover, the driving rod and the right valve cover are sealed, and the right side of the driving rod is driven to rotate manually.

As a preferred scheme of the leakage-free self-sealing electric four-way valve, the high-pressure channel is formed at the lower side of the valve body, and the high-pressure channel and the low-pressure channel are arranged in parallel; the left side of the axial flow pipe is provided with a left baffle, and a plurality of left drainage channels are formed at the left end of the axial flow pipe and the left baffle; a square hole is formed in the middle of the left baffle plate, a square shaft is connected in the square hole, and the square shaft axially moves in the square hole of the left baffle plate; the left side of the square shaft is connected with the left valve cover in a circular shape, the square shaft is led out of the left valve cover, the left valve cover and the square shaft are sealed, a pressing cap is arranged at the joint of the left valve cover and the square shaft, and the left end of the square shaft is manually rotated; a boss is formed on the outer side of the left valve cover and connected with a sealing cover.

As a preferable scheme of the non-leakage self-sealing electric four-way valve, threads or grooves are arranged on the inner surface and the outer surface of the axial flow pipe, and a rectifying plate, a heat insulating material, a heat conducting material or a sound absorbing material is arranged on the inner surface and the outer surface of the axial flow pipe.

As a preferable scheme of the leakage-free self-sealing electric four-way valve, the driving unit on the right side of the valve body adopts a pneumatic device or a hydraulic device, and the pneumatic device or the hydraulic device comprises a piston and a cylinder body.

As a preferred scheme of the leakage-free self-sealing electric four-way valve, a sight glass and a position sensor are arranged on the valve body; a spring body and a spring seat are arranged inside the left hollow piston and the right hollow piston; a filter screen is connected in the high-pressure channel; and a dust cover is arranged outside the driving rod.

Compared with the prior art, the invention has the beneficial effects that: the anti-impurity valve is strong in anti-impurity capacity, a low-pressure channel is formed on the lower side of the middle part of the valve body, a first drainage channel and a second drainage channel are formed on the upper side of the valve body, and the low-pressure channel is positioned between the first drainage channel and the second drainage channel; and a high-pressure channel is formed on the outer side of the left valve cover. The left end of the inner side of the valve body is provided with a left reducing sleeve, the inner side of the left reducing sleeve is provided with a left hollow piston, the right end of the left hollow piston is provided with a left small valve port, and the left hollow piston axially moves to the inner side of the left reducing sleeve; the right end of the inner side of the valve body is provided with a right reducing sleeve, the inner side of the right reducing sleeve is provided with a right hollow piston, the left end of the right hollow piston is provided with a right small valve port, and the right hollow piston axially moves inside the right reducing sleeve. The two sides of the low-pressure channel are reduced to the inner sides of the valve body and are provided with a left big valve port and a right big valve port; an axial flow pipe is arranged in the valve body, a left small valve plate and a left large valve plate are arranged on the left side of the axial flow pipe, and the left small valve plate is positioned on the outer side of the left large valve plate; the right side of the axial flow pipe is provided with a small right valve plate and a large right valve plate, and the small right valve plate is positioned on the outer side of the large right valve plate. The right end of the axial flow pipe is connected with a right baffle, and a plurality of right drainage channels are arranged on the right side wall of the axial flow pipe and the right baffle; the middle part of the right baffle is provided with a driving transition sleeve, the driving transition sleeve is internally connected with a driving rod, the right side of the driving rod is provided with a power supporting plate, the middle part of the power supporting plate is provided with a through hole, and the driving rod is led out from the through hole and extends to the inner center of the axial flow pipe. The right side of the power supporting plate is connected with a gland, the right side of the gland is connected with a driving unit, and the driving unit is connected with a driving rod. The invention eliminates the existing small gap sealing, but adopts plane compression sealing, thereby not only avoiding leakage, but also improving the impurity resistance, being provided with a sensor, realizing control visualization, changing the flow direction of fluid, and being used for fluid switching, refrigeration and heating conversion or defrosting in the fields of air conditioners, refrigeration houses or chemical engineering petroleum and the like.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.

Fig. 1 is a schematic structural view of a no-leakage self-sealing electric four-way valve in a working state according to embodiment 1 of the present invention;

fig. 2 is a schematic structural view of a non-leakage self-sealing electric four-way valve in another working state according to embodiment 1 of the present invention;

fig. 3 is a schematic structural view of a leak-free self-sealing electric four-way valve provided with a maintenance valve according to embodiment 2 of the present invention;

fig. 4 is a schematic structural view of a non-leakage self-sealing electric four-way valve provided with a shielding cavity in embodiment 3 of the present invention;

FIG. 5 is a schematic diagram of a manually driven, leak-free, self-sealing, electrically operated four-way valve installed in a gland in accordance with embodiment 4 of the present invention;

FIG. 6 is a schematic structural diagram of a leak-free self-sealing four-way valve with two manual control radial magnetic drives provided in embodiment 5 of the present invention;

FIG. 7 is a schematic structural view of a no-leakage self-sealing electric four-way valve provided with a hard sealing material according to embodiment 6 of the present invention;

fig. 8 is a schematic structural view of a no-leakage self-sealing electric four-way valve provided with a pneumatic device or a hydraulic device according to embodiment 7 of the present invention;

fig. 9 is a schematic structural view of a no-leakage self-sealing electric four-way valve provided with a viewing mirror and a position sensor according to embodiment 8 of the present invention.

In the figure: 1. a valve body; 2. a left valve cover; 3. a right valve cover; 4. a left reducing sleeve; 5. a left hollow piston; 6. a left small valve port; 7. a right reducing sleeve; 8. a right hollow piston; 9. a right small valve port; 10. an axial flow tube; 11. a left large valve port; 12. a right large valve port; 13. a left small valve plate; 14. a left large valve plate; 15. a right large valve plate; 16. a right small valve plate; 17. driving the transition sleeve; 18. a low pressure channel; 19. a first drainage channel; 20. a second drainage channel; 21. a high pressure channel; 22. a drive rod; 23. a right baffle; 24. a right bleed passage; 25. a left baffle; 26. a power support plate; 27. an inner rotor of the magnetic coupling; 28. a gland; 29. a drive unit; 30. a terminal plate; 31. a sight glass; 32. a position sensor; 33. a through hole; 34. a shielding cavity; 35. a spring body; 36. a square shaft; 37. a compression cap; 38. sealing the cover; 39. a boss; 40. a spring seat; 41. maintaining the valve; 42. a hard seal ring; 43. a soft sealing material; 44. a cylinder body; 45. a piston; 46. a dust cover; 47. a filter screen; 48. a left bleed passage.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

Example 1

Referring to fig. 1 and 2, a leakage-free self-sealing electric four-way valve is provided, which comprises a valve body 1, a left valve cover 2 and a right valve cover 3, wherein the left valve cover 2 and the right valve cover 3 are respectively connected to two ends of the valve body 1, a low-pressure channel 18 is formed at the lower side of the middle part of the valve body 1, a first drainage channel 19 and a second drainage channel 20 are formed at the upper side of the valve body 1, and the low-pressure channel 18 is located between the first drainage channel 19 and the second drainage channel 20; a high pressure passage 21 is formed outside the left valve cover 2. A left reducing sleeve 4 is arranged at the left end of the inner side of the valve body 1, a left hollow piston 5 is arranged at the inner side of the left reducing sleeve 4, a left small valve opening 6 is formed at the right end of the left hollow piston 5, and the left hollow piston 5 axially moves to the inner side of the left reducing sleeve 4; the right end of the inner side of the valve body 1 is provided with a right reducing sleeve 7, the inner side of the right reducing sleeve 7 is provided with a right hollow piston 8, the left end of the right hollow piston 8 is provided with a right small valve opening 9, and the right hollow piston 8 axially moves in the inner side of the right reducing sleeve 7. The two sides of the low-pressure channel 18 are reduced in diameter towards the inner side of the valve body 1 and are provided with a left large valve port 11 and a right large valve port 12; an axial flow pipe 10 is arranged in the valve body 1, a left small valve plate 13 and a left large valve plate 14 are arranged on the left side of the axial flow pipe 10, and the left small valve plate 13 is positioned on the outer side of the left large valve plate 14; the right side of the axial flow pipe 10 is provided with a right small valve plate 16 and a right large valve plate 15, and the right small valve plate 16 is positioned on the right outer side of the right large valve plate 15. The right end of the axial flow pipe 10 is connected with a right baffle 23, and a plurality of right drainage channels 24 are arranged on the right side wall of the axial flow pipe 10 and the right baffle 23; the middle part of the right baffle plate 23 is provided with a driving transition sleeve 17, the driving transition sleeve 17 is internally connected with a driving rod 22, the right side of the driving rod 22 is provided with a power supporting plate 26, the middle part of the power supporting plate 26 is provided with a through hole 33, and the driving rod 22 is led out from the through hole 33 and extends to the inner center of the axial flow pipe 10. A gland 28 is connected to the right side of the power supporting plate 26, a driving unit 29 is connected to the right side of the gland 28, and an output shaft of the driving unit 29 is connected to the driving rod 22.

Specifically, the valve body 1 is inwardly reduced in diameter at two sides of the low-pressure channel 18, the left small valve plate 13 is matched with the left small valve port 6 through movement, and the left large valve plate 14 is matched with the left large valve port 11 through movement. The right small valve plate 16 is matched with the right small valve port 9 through movement, and the right large valve plate 15 is matched with the right large valve port 12 through movement. The drive transition sleeve 17 is provided with an internal thread, the drive rod 22 is provided with an external thread, and the internal thread of the drive transition sleeve 17 is matched with the external thread of the drive rod 22. The right end of the driving rod 22 is expanded and is arranged in the through hole 33, the caliber of the right side of the through hole 33 is larger than that of the left side of the through hole 33, the gland 28 is located on the right side of the through hole 33, and the gland 28 and the through hole limit the driving rod 22 to move left and right. An output shaft of the drive unit 29 is connected to the drive rod 22, and an output line of the drive unit 29 is led out from a middle position of the right bonnet 3 through a terminal plate 30.

In the no-leakage self-closing electric four-way valve provided in this embodiment 1, during normal operation, the terminal board 30 receives a forward rotation voltage to make the driving unit 29 forward rotate, the driving unit 29 drives the driving rod 22 forward rotate, the driving rod 22 makes the driving transition sleeve 17 matched with the driving rod move rightwards, the driving transition sleeve 17 drives the right baffle 23, the right baffle 23 drives the axial flow pipe 10, the axial flow pipe 10 drives the left small valve plate 13, the left large valve plate 14, the right small valve plate 16 and the right large valve plate 15 to move rightwards until the left large valve plate 14 is pressed with the left large valve port 11, at this time, the high pressure channel 21 receives high pressure, fluid enters the left end of the valve body 1 through the high pressure channel 21, the low pressure channel, because the left end surface of the left big valve plate 14 is stressed by high pressure and the right end surface is stressed by low pressure, the left big valve plate 14 is stressed rightwards, the left big valve plate 14 and the left big valve port 11 are compacted and sealed, and fluid flows to the first drainage channel 19 from the high-pressure channel 21.

The high pressure at the left end of the valve body 1 also passes through the axial flow pipe 10 and enters the right end of the valve body 1 through the right discharge passage 24, the right end of the right hollow piston 8 is subjected to the high pressure at the moment, the low pressure of the low pressure passage 18 acts on the left end of the right hollow piston 8 through a gap between the right large valve plate 15 and the valve body 1, the right hollow piston 8 is stressed leftwards, the right small valve port 9 and the right small valve plate 16 are compacted and sealed, and at the moment, the low pressure passage 18 is communicated with the second drainage passage 20.

Under the reducing action of the right reducing sleeve 7, the total sectional area of the right hollow piston 8 and the right small valve plate 16 is smaller than the sectional area of the left large valve plate 14, so that the rightward acting force generated by the left large valve plate 14 is larger than the leftward acting force generated by the right hollow piston 8 and the right small valve plate 16, and the left large valve plate 14 and the left large valve port 11 can be automatically compacted and sealed.

When the terminal board 30 is connected with a reverse voltage, the driving unit 29 drives the driving rod 22 to rotate reversely, the driving rod 22 drives the driving transition sleeve 17 matched with the driving rod to move leftwards, the driving transition sleeve 17 drives the right baffle 23, the right baffle 23 drives the axial flow pipe 10, the axial flow pipe 10 drives the left small valve plate 13, the left large valve plate 14, the right small valve plate 16 and the right large valve plate 15 to move leftwards until the right large valve plate 15 is pressed with the right large valve port 12, and at the moment, the left hollow piston 5 moves rightwards under the action of a high pressure, so that the left small valve port 6 is pressed with the left small valve plate 13 for sealing. The low pressure passage 18 communicates with the first diversion passage 19. The high-pressure fluid is communicated with the second drainage channel 20 through the high-pressure channel 21, the axial flow pipe 10 and the right drainage channel 24 in sequence, so that the change of the fluid flow direction is formed.

Example 2

Referring to fig. 3, the joint of the power support plate 26 and the valve body 1 is sealed, and the joint of the driving rod 22 and the power support plate 26 is sealed; a maintenance valve 41 is arranged between the power supporting plate 26 and the valve body 1.

Through the design of embodiment 2, can make drive unit 29 and the internal fluid body of valve body 1 form and seal relatively, when the maintenance, close maintenance valve 41, open right valve lid 3, because power backup pad 26 seals with valve body 1, there is the sealing material to seal between actuating lever 22 and the power backup pad 26, the internal fluid of valve body 1 reliably seals with the external world, the maintenance is finished, install right valve lid 3 and remain the gap, open maintenance valve 41, the internal fluid of valve body 1 enters the right-hand member of valve body 1 under the effect of pressure, extrude the air of right-hand member, extrude and come out from right valve lid 3 gap extrusion, recompression seals right valve lid 3. When the system needs vacuum maintenance, the vacuum is not affected because the maintenance valve 41 is opened at this time. This function can be achieved by using a structure in which an electromagnetic valve or a steel ball is automatically pressed instead of the maintenance valve 41.

Example 3

Referring to fig. 4, a shielding cavity 34 is formed by protruding the middle part of the right valve cover 3 to the outside, the rotor part of the driving unit 29 is a magnetic coupling inner rotor 27, the magnetic coupling inner rotor 27 is arranged in the shielding cavity 34, the stator part of the driving unit 29 is sleeved on the periphery of the right valve cover 3, and the other structures are the same as those of embodiment 1. When the motor works normally, the stator generates rotating magnetic force to drive the magnetic coupling inner rotor 27 to rotate, and the magnetic coupling inner rotor 27 drives the driving rod 22, so that control in a shielding state is realized, and the sealing performance between internal fluid and the outside is ensured.

Example 4

Referring to fig. 5, the pressing cover 28 is connected to the inner side of the right valve cover 3, the driving rod 22 is led out from the middle of the right valve cover 3, the driving rod 22 and the right valve cover 3 are sealed, the right side of the driving rod 22 is rotated by manual driving, and other structures are the same as those of embodiment 1. Thereby controlling the operation of the valve.

Example 5

Referring to fig. 6, a high pressure passage 21 is formed at the lower side of the valve body 1, and the high pressure passage 21 is juxtaposed with the low pressure passage 18; a left baffle 25 is arranged on the left side of the axial flow pipe 10, and a plurality of left discharge channels 48 are formed on the side wall of the left end of the axial flow pipe 10 and the left baffle 25; a square hole is formed in the middle of the left baffle plate 25, a square shaft 36 is connected in the square hole, and the square shaft 36 axially moves in the square hole of the left baffle plate 25; the left side of the square shaft 36 is connected with the left valve cover 2 in a circular shape, the square shaft 36 is led out from the left valve cover 2, the left valve cover 2 and the square shaft 36 are sealed, a pressing cap 37 is arranged at the joint of the left valve cover 2 and the square shaft 36, and the left end of the square shaft 36 is manually rotated; a boss 39 is formed on the outer side of the left valve cover 2, and a sealing cover 38 is connected to the boss 39. And a spring body 35 and a spring seat 40 are arranged inside the left hollow piston 5 and the right hollow piston 8. The other structure is the same as embodiment 1.

The technical solution provided by embodiment 5 is that, in normal operation, the right side is substantially the same as that of embodiment 3, except that the inner rotor 27 of the magnetic coupling is radially installed.

When the left side is manually operated, the square shaft 36 is manually rotated, the square shaft 36 drives the left baffle 25, the left baffle 25 drives the axial flow pipe 10, the axial flow pipe 10 drives the right baffle 23, the right baffle 23 rotates to drive the transition sleeve 17 to rotate, the driving rod 22 does not rotate at the moment, so that the axial flow pipe 10 moves left and right, and the left large valve plate 14, the right large valve plate 15, the left small valve plate 13, the right small valve plate 16, the left large valve port 11, the right large valve port 12, the left small valve port 6 and the right small valve port 9 on the axial flow pipe 10 are switched and sealed, so that the manual function is realized.

The construction of the square shaft 36 to control the axial flow tube 10 can also be used in a construction to prevent rotation of the axial flow tube 10 when the drive rod 22 is rotated.

Besides, sealing materials are embedded on the left large valve plate 14, the left small valve plate 13, the right large valve plate 16 and the right small valve plate 17 so as to ensure the sealing effect.

Example 6

Referring to fig. 7, when the pressure difference between the high-pressure passage 21 and the low-pressure passage 18 is small, the left large valve plate 14, the right large valve plate 15, the left small valve plate 13, and the right small valve plate 16 are hard seal rings 42, a soft seal material 43 may be inserted between the two hard seal rings 42, and the other structures are the same as those of embodiment 1, but the structure is simpler, but the working pressure difference is small, and the high-pressure switching reliability and the service life are lower.

Example 7

Referring to fig. 8, the driving unit 29 on the right side of the valve body 1 is a pneumatic device including a piston 45 and a cylinder 44 or a hydraulic device, and the other structure is the same as that of embodiment 1.

Example 8

Referring to fig. 9, a viewing mirror 31 and a position sensor 32 are arranged on the valve body 1, the viewing mirror 31 is used for visually checking the positions of the left large valve plate 14, the right large valve plate 15, the left small valve plate 13 and the right small valve plate 16 so as to visually judge the flow direction of the fluid, and the position sensor 32 can output a position signal so as to facilitate PLC control and fault diagnosis. A filter screen 47 is connected in the high-pressure channel 21; and a dust cover 46 is arranged outside the driving rod 22, and a filter screen 47 plays a role in filtering fluid, so that the service life is ensured. The dust cover 46 functions as a dust-proof cover to ensure smooth operation of the drive lever 22. The other structure is the same as embodiment 1.

In addition, the valve body 1 can be made into a non-circular structure, the left large valve plate 14, the right large valve plate 15, the left small valve plate 13 and the right small valve plate 16 on the axial flow pipe 10 can be additionally provided with sealing materials and can also be obliquely arranged, in order to resist impurities, the axial flow pipe 10 can be provided with threads and pits or other friction-resistant materials, the flow passage opening is of a flange connection structure, and the flow passages can be randomly distributed on the circumference.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A leakage-free self-sealing electric four-way valve comprises a valve body (1), a left valve cover (2) and a right valve cover (3), wherein the left valve cover (2) and the right valve cover (3) are respectively connected to two ends of the valve body (1), and the leakage-free self-sealing electric four-way valve is characterized in that a low-pressure channel (18) is formed on the lower side of the middle part of the valve body (1), a first drainage channel (19) and a second drainage channel (20) are formed on the upper side of the valve body (1), and the low-pressure channel (18) is located between the first drainage channel (19) and the second drainage channel (20); a high-pressure channel (21) is formed on the outer side of the left valve cover (2);

a left reducing sleeve (4) is arranged at the left end of the inner side of the valve body (1), a left hollow piston (5) is arranged at the inner side of the left reducing sleeve (4), a left small valve port (6) is formed at the right end of the left hollow piston (5), and the left hollow piston (5) axially moves to the inner side of the left reducing sleeve (4); the right end of the inner side of the valve body (1) is provided with a right reducing sleeve (7), the inner side of the right reducing sleeve (7) is provided with a right hollow piston (8), the left end of the right hollow piston (8) is provided with a right small valve port (9), and the right hollow piston (8) axially moves to the inner side of the right reducing sleeve (7);

the two sides of the low-pressure channel (18) are reduced towards the inner side of the valve body (1) and are provided with a left large valve port (11) and a right large valve port (12); an axial flow pipe (10) is arranged in the valve body (1), a left small valve plate (13) and a left large valve plate (14) are arranged on the left side of the axial flow pipe (10), and the left small valve plate (13) is positioned on the outer side of the left large valve plate (14); the right side of the axial flow pipe (10) is provided with a small right valve plate (16) and a large right valve plate (15), and the small right valve plate (16) is positioned on the outer side of the right side of the large right valve plate (15);

the right end of the axial flow pipe (10) is connected with a right baffle plate (23), and a plurality of right drainage channels (24) are arranged on the right side wall of the axial flow pipe (10) and the right baffle plate (23); the middle part of the right baffle is provided with a driving transition sleeve (17), a driving rod (22) is connected inside the driving transition sleeve (17), the right side of the driving rod (22) is provided with a power supporting plate (26), the middle part of the power supporting plate (26) is provided with a through hole (33), and the driving rod (22) is led out from the through hole (33) and extends to the inner center of the axial flow pipe (10);

the right side of the power supporting plate (26) is connected with a gland (28), the right side of the gland (28) is connected with a driving unit (29), and an output shaft of the driving unit (29) is connected with the driving rod (22).

2. The leakless self-closing electric four-way valve according to claim 1, wherein the valve body (1) is inwardly reduced in diameter on both sides of the low pressure passage (18), the left small valve plate (13) is movably engaged with the left small valve port (6), and the left large valve plate (14) is movably engaged with the left large valve port (11);

the right small valve plate (16) is matched with the right small valve port (9) through movement, and the right large valve plate (15) is matched with the right large valve port (12) through movement.

3. The leakless self-closing electric four-way valve according to claim 1, wherein the driving transition sleeve (17) is provided with an internal thread, the driving rod (22) is provided with an external thread, and the internal thread of the driving transition sleeve (17) is matched with the external thread of the driving rod (22);

the right end of the driving rod (22) is expanded and is arranged in the through hole (33), the caliber of the right side of the through hole (33) is larger than the caliber of the left side of the through hole (33), the gland (28) is positioned on the right side of the through hole (33), and the gland (28) and the through hole limit the driving rod (22) to move left and right;

an output shaft of the driving unit (29) is connected with the driving rod (22), and a lead-out wire of the driving unit (29) is led out from the middle position of the right valve cover (3) through a terminal board (30).

4. The leakless self-closing electric four-way valve according to claim 1, wherein the connection between the power support plate (26) and the valve body (1) is sealed, and the connection between the driving rod (22) and the power support plate (26) is sealed; and a maintenance valve (41) is arranged between the power supporting plate (26) and the valve body (1).

5. The no-leakage self-closing electric four-way valve according to claim 1, wherein the middle part of the right valve cover (3) protrudes outwards to form a shielding cavity (34), the rotor part of the driving unit (29) is a magnetic coupling inner rotor (27), the magnetic coupling inner rotor (27) is arranged in the shielding cavity (34), and the stator part of the driving unit (29) is sleeved on the periphery of the right valve cover (3).

6. The no-leakage self-closing electric four-way valve according to claim 1, characterized in that the gland (28) is connected to the inner side of the right valve cover (3), the driving rod (22) is led out from the middle of the right valve cover (3), the driving rod (22) and the right valve cover (3) are sealed, and the right side of the driving rod (22) is rotated by manual driving.

7. The no-leakage self-closing electric four-way valve according to claim 1, wherein the high pressure passage (21) is formed at the lower side of the valve body (1), and the high pressure passage (21) and the low pressure passage (18) are arranged in parallel; a left baffle plate (25) is arranged on the left side of the axial flow pipe (10), and a plurality of left drainage channels (48) are formed at the left end of the axial flow pipe (10) and on the left baffle plate (25); a square hole is formed in the middle of the left baffle plate (25), a square shaft (36) is connected in the square hole, and the square shaft (36) axially moves in the square hole of the left baffle plate (25); the left side of the square shaft (36) is connected with the left valve cover (2) in a circular shape, the square shaft (36) is led out from the left valve cover (2), the left valve cover (2) and the square shaft (36) are sealed, a pressing cap (37) is arranged at the connection position of the left valve cover (2) and the square shaft (36), and the left end of the square shaft (36) is rotated manually; a boss (39) is formed on the outer side of the left valve cover (2), and a sealing cover (38) is connected to the boss (39).

8. The no-leakage self-closing electric four-way valve according to claim 1, wherein the inner and outer surfaces of the axial flow tube (10) are provided with threads or grooves, and the inner and outer surfaces of the axial flow tube (10) are provided with flow regulating plates or heat insulating materials or heat conducting materials or sound absorbing materials.

9. The no-leakage self-closing electric four-way valve according to claim 1, characterized in that the driving unit (29) on the right side of the valve body (1) adopts a pneumatic or hydraulic device, and the pneumatic or hydraulic device comprises a piston (45) and a cylinder (44).

10. A leakless self-closing electric four-way valve according to claim 1, wherein a sight glass (31) and a position sensor (32) are provided on the valve body (1); a spring body (35) and a spring seat (40) are arranged inside the left hollow piston (5) and the right hollow piston (8); a filter screen (47) is connected in the high-pressure channel (21); and a dust cover (46) is arranged outside the driving rod (22).