CN210290854U - Four-way valve - Google Patents
Four-way valve Download PDFInfo
- Publication number
- CN210290854U CN210290854U CN201920478437.4U CN201920478437U CN210290854U CN 210290854 U CN210290854 U CN 210290854U CN 201920478437 U CN201920478437 U CN 201920478437U CN 210290854 U CN210290854 U CN 210290854U
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- valve
- cylindrical cavity
- sealing
- tooth
- gear
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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- 238000007789 sealing Methods 0.000 claims abstract description 95
- 230000005540 biological transmission Effects 0.000 claims abstract description 16
- 230000009471 action Effects 0.000 claims abstract description 3
- 230000004323 axial length Effects 0.000 claims description 4
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000012530 fluid Substances 0.000 description 9
- 230000007246 mechanism Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 210000003781 tooth socket Anatomy 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
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Abstract
The utility model discloses a cross valve. A cylindrical cavity is arranged in the valve body, four circumferential sides of the cylindrical cavity are provided with four mutually-communicated valve ports, the sealing plate is coaxially arranged in the valve ports, the sealing plate, the valve rod and a tooth block are sequentially and fixedly connected, the tooth block is horizontally arranged in the cylindrical cavity, the tooth block is provided with a tooth groove used for being meshed with a gear, the gear is axially and horizontally hinged and arranged in the cylindrical cavity, the tooth block and the gear are meshed and driven to form second tooth drive, the tooth blocks of the four valve ports are sequentially and horizontally arranged along the axis of the cylindrical cavity at intervals up and down, and strip-shaped through grooves are formed in; the upper end face of the cylindrical cavity is provided with a through hole for the four-side toothed column to pass through, and four cylindrical surfaces of the four-side toothed column are provided with racks and are respectively meshed with the gears to form first gear transmission. The four-side toothed columns sequentially penetrate through the through holes of the four toothed blocks to drive the gear to rotate and the toothed blocks to horizontally move, and the sealing plate axially moves under the action of the toothed blocks, so that the sealing plate is closed or corresponding valve ports are opened. The utility model discloses simple structure, the processing cost is low, and the suitability is strong.
Description
Technical Field
The utility model belongs to the technical field of the valve, concretely relates to cross valve.
Background
In the industrial process, a four-way valve is often needed, the existing four-way valve is usually a cross-shaped discharge part, and four fluid inlets and outlets (referred to as valve ports) on one plane are respectively communicated with four fluid pipelines, a valve core of the four-way valve is usually provided with two fluid passages which are not mutually connected, the two fluid passages are on the same plane and are respectively connected with the four valve ports, the four-way valve can simultaneously conduct and control the four fluid pipelines, the flow direction of fluid media in the pipelines is controlled, the using amount of the two-way valve is saved due to the use of the four-way valve, and the manufacturing cost of process pipelines is reduced. However, four fluid inlets and outlets (referred to as valve ports for short) of the existing four-way valve are all located on the same plane and are communicated in a plane, which causes that the existing four-way valve can realize the communication of every two adjacent fluid pipelines as far as possible. The two opposite pipelines can not be communicated, so the valve solves the problem of full communication, the four-way valve on the market is usually adjacent to each other, the two opposite pipelines can not be communicated, and the full opening of the valve of the four-way valve can not be realized.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects of the prior art, the utility model provides a four-way valve.
The utility model discloses a realize through following technical scheme:
the utility model comprises a valve body, four-side tooth columns, gears and sealing elements, wherein a cylindrical cavity is arranged at the center inside the valve body, four circumferential sides of the cylindrical cavity are provided with a valve port, the four valve ports are communicated with each other, and the central axes of the four valve ports are positioned on the same plane; the sealing piece is arranged in each valve port, the connection structures of the four sealing pieces are the same, the sealing piece comprises a sealing plate, a valve rod and a tooth block which are sequentially connected, the sealing plate is coaxially arranged in the valve port and used for sealing the corresponding valve port, the end face, close to the center of the valve body, of the sealing plate is fixedly connected with one end of the valve rod, the other end of the valve rod radially penetrates through the inner wall of the cylindrical cavity and then is fixedly connected with the tooth block, the tooth block is horizontally arranged in the cylindrical cavity, a tooth groove used for being meshed with a gear is formed in the surface of the tooth block, the gear is axially and horizontally hinged to be arranged in the cylindrical cavity and rotates around the; the tooth blocks of the four valve ports are sequentially horizontally arranged along the axis of the cylindrical cavity at intervals from top to bottom, and strip-shaped through grooves are formed in the center positions of the four tooth blocks; the upper end face of the cylindrical cavity is provided with a through hole for the four-sided toothed column to pass through, the four-sided toothed column is inserted into the cylindrical cavity through the through hole, four cylindrical surfaces of the four-sided toothed column are respectively provided with a rack along the axis direction, and the rack of each cylindrical surface is correspondingly engaged with one gear to form a first gear transmission structure; four sides tooth post top-down or pass the bar logical groove of four tooth pieces from bottom to top in proper order, four sides tooth post contacts four gears in proper order and drives the gear rotation through first tooth transmission structure, and the gear rotation drives the radial horizontal migration of tooth piece along the cylinder chamber through second tooth transmission structure, and the shrouding is axial displacement under the drive effect of tooth piece to make the shrouding seal in proper order or open corresponding valve port in proper order.
Preferably, the axial movement distances of the four sealing plates are different, the axial movement distances of the four sealing plates are sequentially reduced from top to bottom, and the axial lengths of the four valve rods corresponding to the four sealing plates are sequentially reduced from top to bottom.
Preferably, the four valve ports are coaxially provided with conical sealing retaining rings at the center close to the valve body, each sealing plate is coaxially installed with the conical sealing retaining ring of each valve port, the outer peripheral surface of each sealing plate is provided with a conical surface used for being matched with the conical sealing retaining ring, the sealing plates move outwards along the axial direction to enable the sealing plates to be in sealing contact with the conical sealing retaining rings of the valve ports to block the valve ports, and the sealing plates move inwards along the axial direction to enable the sealing plates and the conical sealing retaining rings of the valve ports to be mutually separated to open the valve ports.
Preferably, the upper end face of the four-side toothed column is fixedly connected with a cross rod, and the cross rod is pulled to move up and down to drive the four-side toothed column to be inserted into the cylindrical cavity or be pulled out of the cylindrical cavity.
Preferably, the length of the gear in the axial direction is equal to the sum of the lengths of the corresponding meshed four-sided tooth columns and the tooth blocks.
Compared with the prior art, the beneficial effects of the utility model are that:
current four-way valve can realize switching on two liang of adjacent fluid pipelines as far as possible, and two relative pipelines then can't switch on, the utility model discloses a four-way valve can solve the problem of switching on entirely, has realized opening four valve ports in proper order through the four sides tooth post that sets up, and then realizes that four valves are opened entirely. The utility model discloses simple structure, the processing cost is low, convenient to use, the suitability is strong, easily promotes.
Drawings
FIG. 1 is a front view of the structure of the present invention;
FIG. 2 is a structural sectional view of the present invention;
FIG. 3 is a diagram of the assembly relationship between the sealing mechanism and the moving mechanism of the present invention;
FIG. 4 is a schematic structural view of the four-sided tooth post of the present invention;
fig. 5 is a schematic structural diagram of one of the sealing mechanisms of the present invention.
Fig. 6 is another schematic structural diagram of the sealing mechanism of the present invention.
In the figure: 1. a valve body; 2. a seal member; 3. a cylindrical cavity; 2-1, sealing plates; 2-2, a valve rod; 2-3, a tooth block; 4. a four-sided tooth column; 5. a gear; 6. the cone-shaped sealing baffle ring.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, a cylindrical cavity 3 is arranged in the center of the interior of the valve body 1 along the vertical direction, four circumferential sides of the cylindrical cavity 3 are provided with a valve port, the four valve ports are communicated with each other, the central axes of the four valve ports are located on the same plane, and the included angle between the central axes of two adjacent valve ports is 90 °. The inner space of the valve body 1 is divided into two parts which are not communicated by the cylindrical cavity 3, one part is the space positioned in the cylindrical cavity 3, the other part is the space communicated with the four valve ports outside the cylindrical cavity 3, and the size of the cylindrical cavity 3 does not influence the mutual communication of the four valve ports.
In specific implementation, the lower end of the cylindrical cavity 3 is fixedly connected to the bottom of the valve body 1, and the upper end of the cylindrical cavity 3 vertically penetrates out of the top of the valve body 1. The up end of cylinder chamber 3 is horizontal platform, and the lower terminal surface of cylinder chamber 3 passes through support column fixed connection at the interior bottom surface of valve body 1.
As shown in fig. 2 and 4, the upper end surface of the cylindrical cavity 3 is provided with a through hole for the four-sided tooth column 4 to pass through, and the four-sided tooth column 4 is installed in the cylindrical cavity 3 or is pulled out from the cylindrical cavity 3 through the through hole; the four-side toothed column 4 is inserted into the cylindrical cavity 3 through the through hole, four cylindrical surfaces of the four-side toothed column 4 are respectively provided with a rack along the axis direction, and the rack on each cylindrical surface is correspondingly engaged with one gear 5 to form a first gear transmission structure.
Four flank of tooth of four sides tooth post 4 respectively with a gear 5 meshing formation first tooth transmission structure, four 5 axial both ends of gear are all installed in cylindrical cavity 3 and around self rotation of axes, the number of gear 5 is the same with the number of sealing member 2 to a gear 5 is used with the installation of a sealing member 2 cooperation respectively. The axial length of the gear 5 is equal to the sum of the lengths of the corresponding engaged four-sided tooth columns 4 and the tooth blocks 2-3.
As shown in fig. 2 and 3, a sealing element 2 is installed in each valve port, the connection structure of the four sealing elements 2 is the same, each sealing element 2 comprises a sealing plate 2-1, a valve rod 2-2 and a toothed block 2-3 which are connected in sequence, the sealing plates 2-1 are coaxially arranged in the valve ports and used for sealing the corresponding valve ports, the centers of the four sealing plates 2-1 are respectively collinear with the central axis of the respective valve ports, the end surface of the sealing plate 2-1, which is axial and close to the center of the valve body 1, is fixedly connected with one end of the valve rod 2-2, the other end of the valve rod 2-2 radially penetrates through the inner wall of the cylindrical cavity 3 and then is fixedly connected with the toothed block 2-3, the toothed block 2-3 is horizontally arranged in the cylindrical cavity 3, the surface of the toothed block 2-3 is provided with a tooth groove for meshing with a gear 5, the gear block 2-3 and the gear 5 are in meshing transmission to form a second gear transmission structure; the tooth blocks 2-3 of the four valve ports are sequentially and horizontally arranged along the axis of the cylindrical cavity 3 at intervals from top to bottom.
As shown in fig. 5 and 6, the upper end surface or the lower end surface of each tooth block 2-3 is uniformly provided with a wavy tooth socket, and the tooth blocks 2-3 of the four sealing members 2 are meshed with a corresponding gear 5 through the respective tooth sockets to form a second tooth transmission structure, namely, each gear 5 is meshed with the rack of the four-sided tooth column 4 and simultaneously meshed with the tooth blocks 2-3. The central position of each tooth block 2-3 is provided with a strip-shaped through groove, the size of each through hole can enable the four-side tooth column 4 to penetrate through the through groove, the four tooth blocks 2-3 are sequentially arranged in parallel at intervals along the vertical direction, and the four tooth blocks 2-3 are all arranged horizontally. Strip-shaped through grooves are formed in the center positions of the four tooth blocks 2-3; the length direction of the strip-shaped through grooves of each tooth block 2-3 is parallel to the axis direction of the corresponding valve port, the lengths of the four strip-shaped through grooves are reduced from top to bottom in sequence, and the widths of the four strip-shaped through grooves at least enable the four-side tooth columns 4 to penetrate through the four-side tooth columns.
The four valve ports corresponding to the four tooth blocks from top to bottom in fig. 3 are respectively called a first valve port, a second valve port, a third valve port and a fourth valve port, the corresponding sealing elements are also respectively a first sealing element, a second sealing element, a third sealing element and a fourth sealing element, and the gears meshed with the corresponding sealing elements are respectively a first gear, a second gear, a third gear and a fourth gear. As shown in fig. 5 and 6, in order to realize that the four tooth blocks 2-3 are arranged in parallel at intervals in sequence along the vertical direction, the valve rod 2-2 of the third valve port can be arranged coaxially with the sealing plate 2-1, as shown in fig. 5. In order to ensure that the valve stems of other valve ports and the valve stem of the third valve port are in the same plane, the valve stem 2-2 of the second valve port is processed into the valve stem 2-2 with a bending structure, as shown in fig. 6. The third valve port and the fourth valve port are the same, and the four tooth blocks 2-3 can be sequentially arranged in parallel at intervals along the vertical direction by improving the structures of the valve rods 2-2 of the sealing elements 2 of the four valve ports.
In specific implementation, because the meshing times of the first gear, the second gear, the third gear and the fourth gear with the four-sided toothed column 4 are reduced in sequence, the moving distances of the four toothed blocks 2-3 driven by the first gear, the second gear, the third gear and the fourth gear are also reduced in sequence, so that the axial moving distances of the four sealing plates 2-1 are different: decreasing from top to bottom. Therefore, the axial lengths of the four valve rods 2-2 corresponding to the four seal plates 2-1 are sequentially reduced from top to bottom. Because the four tooth blocks 2-3 arranged up and down have different movement distances, the corresponding strip-shaped through grooves have different lengths, specifically, the lengths of the strip-shaped through grooves are sequentially reduced from top to bottom so as to respectively match the movable gaps of the corresponding tooth blocks 2-3 moving in the horizontal axial direction, and the widths of the four strip-shaped through grooves at least enable the four-side tooth columns 4 to penetrate through the four-side tooth blocks.
As shown in fig. 3, in the process that the four-sided toothed pillars 4 are inserted into the cylindrical cavity 3 from top to bottom or are pulled out from the cylindrical cavity 3 from bottom to top, the four-sided toothed pillars 4 sequentially pass through the strip-shaped through grooves of the four toothed blocks 2-3, the four-sided toothed pillars 4 sequentially contact the four gears 5 and drive the gears 5 to rotate through the first tooth transmission structure, the gears 5 rotate to drive the toothed blocks 2-3 to horizontally move along the radial direction of the cylindrical cavity 3 through the second tooth transmission structure, and the sealing plate 2-1 axially moves under the driving action of the toothed blocks 2-3, so that the sealing plate 2-1 sequentially closes or sequentially opens corresponding valve ports.
In specific implementation, the four-sided toothed column 4 is a straight quadrangular prism, and strip-shaped rack structures are arranged on four surfaces of the straight quadrangular prism; the four-side tooth column 4 is inserted downwards from the top of the valve body 1 and is connected with a gear 5 through a cylindrical cavity 3.
As shown in fig. 2, the four valve ports are provided with conical sealing baffle rings 6 near the center of the valve body 1, the radial dimension of the inner end surface of each conical sealing baffle ring 6 is larger than that of the outer end surface, each sealing plate 2-1 is coaxial with the conical sealing baffle ring 6 of the respective valve port, the outer peripheral surface of each sealing plate 2-1 is a conical surface for matching with the conical sealing baffle ring 6, the radial dimension of the inner end surface of each sealing plate 2-1 is larger than that of the outer end surface, the conical surface of each sealing plate 2-1 is just matched in the opening of the baffle ring, the sealing plate 2-1 moves outwards along the axial direction (i.e. moves outwards away from the center of the valve body 1) to make the sealing plate 2-1 and the conical sealing baffle ring 6 in sealing contact so as to seal the valve port, and the sealing plate 2-1 moves inwards along the axial direction (i.e. moves inwards close to the center of the valve body 1) to make the sealing plate 2-1 and the conical sealing baffle ring 6 separate from each other so as to open the valve port.
The four-side toothed column 4 is exposed out of the upper end face of the top of the valve body 1, a cross rod is fixedly connected with the upper end face of the four-side toothed column, the cross rod is horizontally arranged perpendicular to the axis direction of the four-side toothed column 4, and the cross rod is pulled to move up and down to drive the four-side toothed column 4 to be inserted into the cylindrical cavity 3 or be pulled out of the cylindrical cavity 3.
The utility model discloses a concrete working process as follows:
the cross bar is pushed to enable the four-sided tooth columns 4 to be inserted into the cylindrical cavity 3 from the through hole on the upper end face of the cylindrical cavity 3, the four-sided tooth columns 4 sequentially pass through the tooth blocks 2-3 of the first valve port, the second valve port, the third valve port and the fourth valve port in the process of moving from top to bottom, and simultaneously, the gear 5 of the first valve port, the second valve port, the third valve port and the fourth valve port is also sequentially driven to rotate, because the gear 5 at the first valve port is meshed with the tooth blocks 2-3 of the first valve port, the gear 5 corresponding to the first valve port rotates to drive the tooth blocks 2-3 of the first valve port to horizontally move, the size of the central through hole of the tooth blocks 2-3 is enough for the tooth blocks 2-3 to horizontally move, the horizontal direction movement of the tooth blocks 2-3 drives the sealing plate 2-1 of the first valve port to move inwards, so that the first valve port is opened, the four-sided tooth columns 4 are, the second valve port, the third valve port and the fourth valve port are opened in sequence, so that the four valve ports are completely communicated.
The cross bar is pulled outwards to enable the four-side toothed columns 4 to be pulled out of the cylindrical cavity 3, the four-side toothed columns 4 move from bottom to top to sequentially drive the gear 5 of the fourth valve port, the third valve port, the second valve port and the first valve port to rotate reversely, the gear 5 of the fourth valve port is meshed with the toothed blocks 2-3 of the fourth valve port, the gear 5 corresponding to the fourth valve port rotates reversely to drive the toothed blocks 2-3 of the first valve port to move horizontally in the opposite direction, so that the fourth valve port is closed, the four-side toothed columns 4 penetrate out of the four toothed blocks 2-3 from bottom to top completely, and the third valve port, the second valve port and the first valve port are closed sequentially, so that the four valve ports are completely closed.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the above embodiments, and that the foregoing embodiments and descriptions are provided only to illustrate the principles of the present invention without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (4)
1. A four-way valve is characterized in that: the valve comprises a valve body (1), four-side toothed columns (4), a gear (5) and a sealing element (2), wherein a cylindrical cavity (3) is arranged in the center of the interior of the valve body (1), four circumferential sides of the cylindrical cavity (3) are provided with a valve port, the four valve ports are communicated with each other, and the central axes of the four valve ports are positioned on the same plane; each valve port is internally provided with a sealing element (2), the four sealing elements (2) are the same in connection structure, each sealing element (2) comprises a sealing plate (2-1), a valve rod (2-2) and a tooth block (2-3) which are sequentially connected, the sealing plates (2-1) are coaxially arranged in the valve ports and used for sealing the corresponding valve ports, the end surfaces of the sealing plates (2-1) which are axial and close to the center of the valve body (1) are fixedly connected with one end of the valve rod (2-2), the other end of the valve rod (2-2) radially penetrates through the inner wall of the cylindrical cavity (3) and then is fixedly connected with the tooth block (2-3), the tooth blocks (2-3) are horizontally arranged in the cylindrical cavity (3), tooth grooves used for being meshed with the gears (5) are formed in the surfaces of the tooth blocks (2-3), the gears (5) are axially and horizontally hinged in the cylindrical cavity (3, the gear block (2-3) and the gear (5) are in meshing transmission to form a second gear transmission structure; the tooth blocks (2-3) of the four valve ports are sequentially horizontally arranged along the axis of the cylindrical cavity (3) at intervals from top to bottom, and strip-shaped through grooves are formed in the center positions of the four tooth blocks (2-3); the upper end face of the cylindrical cavity (3) is provided with a through hole for the four-side toothed column (4) to pass through, the four-side toothed column (4) is inserted into the cylindrical cavity (3) through the through hole, four cylindrical surfaces of the four-side toothed column (4) are respectively provided with a rack along the axis direction, and the rack of each cylindrical surface is respectively correspondingly engaged with one gear (5) to form a first gear transmission structure; four-side toothed columns (4) sequentially penetrate through the strip-shaped through grooves of the four toothed blocks (2-3) from top to bottom or from bottom to top, the four-side toothed columns (4) sequentially contact the four gears (5) and drive the gears (5) to rotate through the first tooth transmission structure, the gears (5) rotate and drive the toothed blocks (2-3) to horizontally move along the radial direction of the cylindrical cavity (3) through the second tooth transmission structure, and the sealing plate (2-1) axially moves under the driving action of the toothed blocks (2-3), so that the sealing plate (2-1) is sequentially closed or corresponding valve ports are sequentially opened.
2. The four-way valve of claim 1, wherein: the axial movement distances of the four sealing plates (2-1) are different, the axial movement distances of the four sealing plates (2-1) are sequentially reduced from top to bottom, and the axial lengths of the four valve rods (2-2) corresponding to the four sealing plates (2-1) are sequentially reduced from top to bottom.
3. The four-way valve of claim 1, wherein: the four valve ports are coaxially provided with conical sealing baffle rings (6) at the positions close to the center of the valve body (1), each sealing plate (2-1) is coaxially installed with the conical sealing baffle ring (6) of each valve port, the peripheral surface of each sealing plate (2-1) is processed with a conical surface used for being matched with the conical sealing baffle ring (6) for use, the sealing plates (2-1) move outwards along the axial direction to enable the sealing plates (2-1) to be in sealing contact with the conical sealing baffle rings (6) of the valve ports so as to block the valve ports, and the sealing plates (2-1) move inwards along the axial direction to enable the sealing plates (2-1) and the conical sealing baffle rings (6) of the valve ports to be separated from each other so as to open.
4. The four-way valve of claim 1, wherein: the upper end face of the four-side toothed column (4) is fixedly connected with a cross rod, and the cross rod is pulled to move up and down to drive the four-side toothed column (4) to be inserted into the cylindrical cavity (3) or be pulled out of the cylindrical cavity (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920478437.4U CN210290854U (en) | 2019-04-10 | 2019-04-10 | Four-way valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920478437.4U CN210290854U (en) | 2019-04-10 | 2019-04-10 | Four-way valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210290854U true CN210290854U (en) | 2020-04-10 |
Family
ID=70067447
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920478437.4U Withdrawn - After Issue CN210290854U (en) | 2019-04-10 | 2019-04-10 | Four-way valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210290854U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109944961A (en) * | 2019-04-10 | 2019-06-28 | 浙江理工大学 | Four-way valve |
-
2019
- 2019-04-10 CN CN201920478437.4U patent/CN210290854U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109944961A (en) * | 2019-04-10 | 2019-06-28 | 浙江理工大学 | Four-way valve |
| CN109944961B (en) * | 2019-04-10 | 2024-02-13 | 浙江理工大学 | Four-way valve |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20200410 Effective date of abandoning: 20240213 |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20200410 Effective date of abandoning: 20240213 |