CN112855984A - Pre-biased structure four-way valve - Google Patents
Pre-biased structure four-way valve Download PDFInfo
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- CN112855984A CN112855984A CN202110283390.8A CN202110283390A CN112855984A CN 112855984 A CN112855984 A CN 112855984A CN 202110283390 A CN202110283390 A CN 202110283390A CN 112855984 A CN112855984 A CN 112855984A
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- 238000010438 heat treatment Methods 0.000 description 18
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/04—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves
- F16K11/052—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves with pivoted closure members, e.g. butterfly valves
- F16K11/0525—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only lift valves with pivoted closure members, e.g. butterfly valves the closure members being pivoted around an essentially central axis
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
- F16K27/0218—Butterfly valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0263—Construction of housing; Use of materials therefor of lift valves multiple way valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/12—Covers for housings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
- F16K31/042—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves with electric means, e.g. for controlling the motor or a clutch between the valve and the motor
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
- F16K31/041—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves
- F16K31/043—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor for rotating valves characterised by mechanical means between the motor and the valve, e.g. lost motion means reducing backlash, clutches, brakes or return means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0025—Electrical or magnetic means
- F16K37/0041—Electrical or magnetic means for measuring valve parameters
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
A valve core is arranged in a valve body of a four-way valve with a pre-bias structure; the valve core comprises a middle clapboard, an upper baffle and a lower baffle, and the middle clapboard is positioned at the eccentric position between the upper baffle and the lower baffle; the upper side of the upper baffle is connected with an upper output shaft, the lower side of the lower baffle is connected with a lower output shaft, and side pushing positioning pieces are arranged in the radial directions of the upper output shaft and the lower output shaft; the upper output shaft is provided with an upper bearing, the lower output shaft is provided with a lower bearing, the upper bearing and the lower bearing are both positioned at the outer side of the side pushing position part, and the side pushing position part enables the geometric circle center of the valve core and the rotating circle center of the valve core to generate eccentricity; an upper bearing cover is arranged on the outer side of the upper bearing, and the outer wall of the upper bearing cover is matched with the inner wall of the valve body; the outer side of the lower bearing is provided with a lower bearing cover, and the outer wall of the lower bearing cover is matched with the inner wall of the valve body. The side pushing position piece is arranged, the side pushing position piece can perform pre-bias sealing on the valve core, the shape of the valve core is changed, the maintenance sealing piece is added, the internal leakage amount is greatly reduced, the fluid resistance is reduced, and the reliability is high.
Description
Technical Field
The invention belongs to the technical field of valves, and particularly relates to a four-way valve with a pre-biased structure.
Background
In the field of electric four-way valves for air conditioners at present, because an exhaust end is high-temperature and high-pressure gas and an air suction end is low-temperature and low-pressure gas in the operation process of the air conditioner, media flowing into and out of the four-way valve have temperature difference and pressure difference, and a four-way valve body generates pressure deformation and thermal deformation, so that the four-way valve with a rotary structure has poor stability ratio and large leakage. In addition, the resistance of the fluid of the existing product is large, and the energy consumption is high. And if the maintenance is generated, the reverse Freon maintenance is required, which causes gas greenhouse effect and environmental pollution. A new four-way valve technical scheme is needed urgently, and the inventor develops a series of technical schemes for the four-way valve.
Disclosure of Invention
Therefore, the invention provides a pre-biased structure four-way valve, which solves the problem of poor reliability of the four-way valve in operation under the condition of pressure difference and temperature difference and solves the problem of maintenance pollution.
In order to achieve the above purpose, the invention provides the following technical scheme: a four-way valve with a pre-biased structure comprises a valve body, wherein the upper end of the valve body is connected with an upper cover body, the lower end of the valve body is connected with a lower cover body, four channels are arranged on the side wall of the valve body, and a valve core is arranged inside the valve body;
the valve core comprises a middle partition plate, an upper baffle plate and a lower baffle plate, the middle partition plate is one of a flat plate shape, an arc shape, an arched fluid curved surface or a pipeline elbow shape, and the middle partition plate is positioned at an eccentric position between the upper baffle plate and the lower baffle plate;
the upper side of the upper baffle is connected with an upper output shaft, the lower side of the lower baffle is connected with a lower output shaft, and side pushing positioning pieces are arranged in the radial directions of the upper output shaft and the lower output shaft; the upper output shaft is provided with an upper bearing, the lower output shaft is provided with a lower bearing, the upper bearing and the lower bearing are both positioned on the outer side of the side pushing and positioning piece, and the side pushing and positioning piece enables the geometric circle center of the valve core and the rotating circle center of the valve core to generate eccentricity; an upper bearing cover is arranged on the outer side of the upper bearing, and the outer wall of the upper bearing cover is matched with the inner wall of the valve body; a lower bearing cover is arranged on the outer side of the lower bearing, and the outer wall of the lower bearing cover is matched with the inner wall of the valve body;
a driving assembly is arranged above the upper bearing cover, and a power shaft of the driving assembly is connected with the upper output shaft; a power supporting plate is arranged inside the valve body, and a driving assembly is fixed on the power supporting plate or directly fixed on the upper bearing cover; the driving assembly is provided with an outgoing line, the upper cover body is connected with a terminal board, the terminal board is connected with a binding post, and the lower part of the binding post is connected with the outgoing line of the driving assembly;
the lower output shaft is led out through a middle hole of the lower bearing cover, a sensing plate is arranged at the lower part of the lower output shaft, and the sensing plate is provided with a magnetic block; the lower cover body is provided with a sensor blind hole, a sensor is arranged in the sensor blind hole, and the magnetic block rotates along with the valve core and is sensed by the sensor.
As a preferred scheme of the four-way valve with the pre-bias structure, the upper baffle and the lower baffle are both semicircular, and the central angle of the upper baffle and the lower baffle is less than 180 degrees.
As a preferred scheme of the pre-biased structure four-way valve, maintenance sealing parts are arranged at the matching positions of the upper output shaft and the upper bearing cover and the matching positions of the lower output shaft and the lower bearing cover; a terminal plate sealing element is arranged between the terminal plate and the upper cover body;
and matching sealing pieces are arranged on the matching surface positions of the upper surface of the valve body and the upper cover body and on the matching surface positions of the valve body and the lower cover body.
As a preferable scheme of the pre-biased structure four-way valve, the upper bearing and the lower bearing are both tapered roller bearings or tapered sliding bearings, and a spring is arranged at any position of the lower part of the lower bearing cover, the upper part of the upper bearing cover, the inner ring of the tapered roller bearing or the outer ring of the tapered roller bearing, and the spring is a disc spring, a wave spring or a pressure spring.
As a preferred scheme of the pre-biased structure four-way valve, at least one control channel K is arranged on the lower portion of the lower bearing cover, the upper portion of the upper bearing cover or the side wall of the valve body, the control channel K is connected with a control valve, the control valve adopts one of an electromagnetic valve, a four-way valve, a three-way valve, a ball valve or a gate valve, and the control valve is connected with a high-pressure source or a low-pressure source.
As a preferred scheme of the pre-biased structure four-way valve, at least one channel J is arranged at the position of the upper output shaft or the lower output shaft, and the channel J is communicated with a cavity of the semicircular part of the valve core;
the lower bearing cover or the upper bearing cover is provided with an anti-rotation pin, one end of the anti-rotation pin is connected with the lower bearing cover or the upper bearing cover, and the other end of the anti-rotation pin is connected with the valve body or the power supporting plate;
the lower bearing cover or the upper bearing cover is at least provided with a hole channel L, the channel L is communicated with the semicircular defect part of the valve core, the output shaft of the driving assembly is provided with a rotating plate, the rotating plate is provided with a valve head, the valve head is provided with a pre-pressing spring, and the valve head is driven by the rotating plate to open and close the hole channel L.
As a preferred scheme of the pre-biased structure four-way valve, the driving assembly comprises a motor and a speed reducer, the speed reducer is any one of a planetary speed reducer, a worm gear speed reducer, a hard tooth surface speed reducer, a harmonic speed reducer and a cycloidal speed reducer, and the motor is any one of a direct current motor, an alternating current motor, a permanent magnet motor, a stepping motor, a servo motor and a magnetic coupling;
the sensor is a magnetic sensor, a photoelectric sensor or a mechanical switch, the sensor is arranged in the middle of the valve body or on the side wall of the valve body, the number of the sensors is at least one, and the number of the magnetic blocks corresponding to the sensors is at least one.
As a preferable scheme of the four-way valve with a pre-bias structure, a terminal protection cover is arranged at the outer side of the terminal board, a hole is formed in the side surface of the terminal protection cover, and a lead of the terminal board is led out to a junction box arranged at the side part of the upper cover body through a terminal board side hole;
a sensor protective cover is arranged outside the sensor, a hole is formed in the side face of the sensor protective cover, and a lead of the sensor is led out to a junction box arranged at the side part of the upper cover body through the sensor protective cover side hole;
or the terminal board is arranged at the side part of the valve body, and the sensor is arranged at the middle part or the side wall in the valve body.
As a preferred scheme of the pre-biased structure four-way valve, a wear-resistant sealing element is arranged at a matching position, close to the valve core, on the outer wall of the valve core or the inner wall of the valve body, and the wear-resistant sealing element is made of composite materials, alloys or polytetrafluoroethylene high polymer materials;
the wear-resistant sealing element is a copper sleeve, and a lubricating material is embedded in the copper sleeve; the wear-resistant sealing element is assembled in a mode of embedding, casting, welding or spraying.
As a preferred scheme of the pre-biased structure four-way valve, a movable stop block is arranged at the lower part of the lower output shaft, and a fixed limit stop block is arranged on the lower cover body or the lower bearing cover; the movable stop block is limited and stopped by the fixed limit stop block in the process of rotating along with the valve core;
and a sight glass is arranged at the middle position of the lower cover body or on the side wall of the valve body.
The invention is provided with a valve body, the upper end of the valve body is connected with an upper cover body, the lower end of the valve body is connected with a lower cover body, the side wall of the valve body is provided with four channels, and a valve core is arranged inside the valve body; the valve core comprises a middle clapboard, an upper baffle and a lower baffle, and the middle clapboard is positioned at the eccentric position between the upper baffle and the lower baffle; the upper side of the upper baffle is connected with an upper output shaft, the lower side of the lower baffle is connected with a lower output shaft, and side pushing positioning pieces are arranged in the radial directions of the upper output shaft and the lower output shaft; the upper output shaft is provided with an upper bearing, the lower output shaft is provided with a lower bearing, the upper bearing and the lower bearing are both positioned at the outer side of the side pushing position part, and the side pushing position part enables the geometric circle center of the valve core and the rotating circle center of the valve core to generate eccentricity; an upper bearing cover is arranged on the outer side of the upper bearing, and the outer wall of the upper bearing cover is matched with the inner wall of the valve body; a lower bearing cover is arranged on the outer side of the lower bearing, and the outer wall of the lower bearing cover is matched with the inner wall of the valve body; a driving assembly is arranged above the upper bearing cover, and a power shaft of the driving assembly is connected with the upper output shaft; a power supporting plate is arranged inside the valve body, and the driving assembly is fixed on the power supporting plate or directly fixed on the upper bearing cover; the driving assembly is provided with an outgoing line, the upper cover body is connected with a terminal board, the terminal board is connected with a binding post, and the lower part of the binding post is connected with the outgoing line of the driving assembly; the lower output shaft is led out through a middle hole of the lower bearing cover, the lower part of the lower output shaft is provided with a sensing plate, and the sensing plate is provided with a magnetic block; the lower cover body is provided with a sensor blind hole, a sensor is arranged in the sensor blind hole, the sensor and the magnetic block are distributed on the same circumference, and the magnetic block rotates along with the valve core. The side pushing position piece is arranged, the side pushing position piece can perform pre-bias sealing on the valve core, the shape of the valve core is changed, the maintenance sealing piece is added, the internal leakage amount is greatly reduced, the fluid resistance is reduced, the running reliability of the four-way valve under the pressure difference and the temperature difference is enhanced, after the maintenance sealing piece is added, the maintenance can be performed under pressure, the emission and the pollution are reduced, and the vacuumizing operation of the system is not influenced.
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.
Fig. 1 is a schematic structural diagram of a four-way valve with a pre-biased structure provided in embodiment 1 of the present invention;
FIG. 2 is a schematic diagram of a valve core structure of a four-way valve with a pre-biased structure provided in embodiment 1 of the present invention;
fig. 3 is a schematic view of a valve core and an output shaft matching structure of a four-way valve with a pre-biased structure provided in embodiment 1 of the present invention;
FIG. 4 is a schematic diagram showing a four-way valve structure of a pre-biased structure in the form of a tapered roller bearing provided in embodiment 2 of the present invention;
FIG. 5 is a schematic diagram of a valve core structure of a four-way valve with a pre-biased structure in the form of valve core separation bias provided in embodiment 2 of the present invention;
fig. 6 is a schematic diagram of a four-way valve of a pre-bias structure according to embodiment 2 of the present invention;
FIG. 7 is a schematic diagram of a four-way valve with a pre-biased structure of a control valve according to embodiment 3 of the present invention;
FIG. 8 is a schematic diagram of a four-way valve with a pre-biased structure provided in embodiment 4 of the present invention;
FIG. 9 is a schematic diagram of a five-way valve passage of a pre-biasing arrangement provided in embodiment 4 of the present invention;
FIG. 10 is a schematic diagram of a four-way valve with a pre-biased structure of a control valve according to embodiment 5 of the present invention;
fig. 11 is a schematic structural view of a four-way valve driving pin and a rotating plate of a pre-biased structure with a control valve provided in embodiment 5 of the present invention.
In the figure, 1, a valve body; 2. an upper cover body; 3. a lower cover body; 4. a valve core; 5. a middle partition plate; 6. an upper baffle plate; 7. a lower baffle plate; 8. upward shaft output; 9. a lower shaft is output; 10. a side pushing position piece; 11. an upper bearing; 12. a lower bearing; 13. an upper bearing cap; 14. a lower bearing cap; 15. a drive assembly; 16. a power support plate; 17. a terminal plate; 18. a sensor board; 19. a magnetic block; 20. a sensor blind hole; 21. repairing the sealing element; 22. a terminal plate seal; 23. a mating seal; 24. an anti-rotation pin; 25. a rotating plate; 26. a valve head; 27. a movable stop block; 28. fixing a limit stop block; 29. a sight glass; 30. and driving the pin shaft.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, 2 and 3, embodiment 1 of the present invention provides a pre-biased structure four-way valve, including a valve body 1, an upper cover 2 connected to an upper end of the valve body 1, a lower cover 3 connected to a lower end of the valve body 1, four channels provided on a side wall of the valve body 1, and a valve core 4 provided inside the valve body 1;
the valve core 4 comprises a middle partition plate 5, an upper baffle plate 6 and a lower baffle plate 7, the middle partition plate 5 is one of a flat plate shape, an arc shape, an arch fluid curved surface or a pipeline elbow shape, and the middle partition plate 5 is positioned at an eccentric position between the upper baffle plate 6 and the lower baffle plate 7;
an upper output shaft 8 is connected to the upper side of the upper baffle 6, a lower output shaft 9 is connected to the lower side of the lower baffle 7, and side pushing positioning pieces 10 are arranged in the radial directions of the upper output shaft 8 and the lower output shaft 9; the upper output shaft 8 is provided with an upper bearing 11, the lower output shaft 9 is provided with a lower bearing 12, the upper bearing 11 and the lower bearing 12 are both positioned at the outer side of the side pushing part 10, and the side pushing part 10 enables the geometric circle center of the valve core 4 and the rotating circle center of the valve core 4 to generate eccentricity; an upper bearing cover 13 is arranged on the outer side of the upper bearing 11, and the outer wall of the upper bearing cover 13 is matched with the inner wall of the valve body 1; a lower bearing cover 14 is arranged on the outer side of the lower bearing 12, and the outer wall of the lower bearing cover 14 is matched with the inner wall of the valve body 1;
a driving assembly 15 is arranged above the upper bearing cover 13, and a power shaft of the driving assembly 15 is connected with the upper output shaft 8; a power supporting plate 16 is arranged inside the valve body 1, and a driving assembly 15 is fixed on the power supporting plate 16 or directly fixed on the upper bearing cover 13; the drive assembly 15 is provided with a lead-out wire, the upper cover body 2 is connected with a terminal board 17, the terminal board 17 is connected with a binding post, and the lower part of the binding post is connected with the lead-out wire of the drive assembly 15;
the lower output shaft 9 is led out through a middle hole of the lower bearing cover 14, a sensing plate 18 is arranged at the lower part of the lower output shaft 9, and the sensing plate 18 is provided with a magnetic block 19; the lower cover body 3 is provided with a sensor blind hole 20, a sensor is arranged in the sensor blind hole 20, the sensor and the magnetic block 19 are distributed on the same circumference, and the magnetic block 19 rotates along with the valve core 4 and is sensed by the sensor.
In this embodiment, the positions where the upper output shaft 8 is matched with the upper bearing cover 13 and the positions where the lower output shaft 9 is matched with the lower bearing cover 14 are both provided with maintenance sealing parts 21; a terminal plate sealing member 22 is arranged between the terminal plate 17 and the upper cover body 2; and matching sealing pieces 23 are arranged on the matching surface positions of the upper surface of the valve body 1 and the upper cover body 2 and the matching surface positions of the valve body 1 and the lower cover body 3. The maintenance seal 21 is an O-ring, and the terminal plate seal 22 is a flat gasket. When in maintenance, the trouble of fluorine guiding evacuation and environmental pollution can be avoided.
In this embodiment, a terminal protection cover is provided outside the terminal board 17, a hole is provided on a side surface of the terminal protection cover, and a lead of the terminal board 17 is led out to a terminal box provided on a side portion of the upper cover 2 through the side hole of the terminal board 17; a sensor protective cover is arranged outside the sensor, a hole is formed in the side face of the sensor protective cover, and a lead of the sensor is led out to a junction box arranged at the side part of the upper cover body 2 through the hole of the sensor protective cover; or the terminal board 17 is arranged at the side part of the valve body 1, and the sensor is arranged at the middle part or the side wall in the valve body 1.
In this embodiment, the driving assembly 15 includes a motor and a speed reducer, the speed reducer is any one of a planetary speed reducer, a worm gear speed reducer, a hard tooth surface speed reducer, a harmonic speed reducer and a cycloidal speed reducer, and the motor is any one of a direct current motor, an alternating current motor, a permanent magnet motor, a stepping motor, a servo motor and a magnetic coupling; the sensor is a magnetic sensor, a photoelectric sensor or a mechanical switch.
It is readily appreciated that the drive assembly 15 may be driven pneumatically or hydraulically, in addition to being electrically driven.
In this embodiment, the lower output shaft 9 of the valve element 4 is led out through a middle hole of the lower bearing cover 14, the lower part of the lower output shaft 9 is provided with a sensing plate 18, the sensing plate is provided with two magnetic blocks 19, the lower cover body 3 is provided with three sensor blind holes, namely a left sensor blind hole, a middle sensor blind hole and a right sensor blind hole, magnetic sensors are arranged in the sensor blind holes, the magnetic sensors and the magnetic blocks 19 are in corresponding relation and distributed on a circle, the magnetic blocks 19 can be driven by the valve element 4 to rotate, the three sensors are arranged in this embodiment, the left sensor group and the middle sensor group form a heating sensor group, and the right sensor group and the middle sensor group.
In this embodiment, the side pushing member 10 may also be a circular eccentric structure, which is elastic itself or is combined with other members to form an elastic member.
When the four-way valve with the pre-bias structure works, the initial state is a heating state, the channels are DC-conducted and SE-conducted, the magnetic blocks 19 on the sensing plate 18 correspond to the heating sensor groups, control signals are output, the refrigerating sensor groups do not correspond to the magnetic blocks 19 and do not output signals, when the refrigerating state is required, namely the DE-conducted and SC-conducted state is converted, the refrigerating sensor groups do not have in-place signals, an external control circuit supplies power to the driving assembly 15, the driving assembly 15 rotates to drive the valve core 4 to rotate, the valve core 4 drives the sensing plate 18 to rotate, the magnetic blocks 19 on the sensing plate 18 also rotate, when the magnetic blocks 19 correspond to the refrigerating sensor groups, signals are output, the channels are DE-conducted and SC-conducted, after the control system receives the signals of the refrigerating sensor groups, the power supply to the driving assembly 15 is stopped, and the valve core 4 stops.
If the heating state needs to be switched back again, and the heating sensor does not output a signal, the driving circuit enables the driving assembly 15 to rotate reversely until the valve core 4 rotates to the heating state, the heating sensor corresponds to the magnetic block 19 to generate a heating in-place signal, and the driving circuit enables the motor to stop rotating. At this time, the heating state is recovered, the channel DC is conducted, and the channel SE is conducted.
It will be appreciated by those skilled in the art that an electrical braking or damping mechanism may be added to drive assembly 15 in order to prevent rotational inertia of drive assembly 15. In addition, in order to protect the drive assembly 15 and to prevent the drive assembly 15, in particular the motor, from being burnt, an overload protector is connected in series in the motor circuit.
Example 2
Referring to fig. 4, 5 and 6, embodiment 2 of the present invention provides a pre-biased four-way valve, including a valve body 1, an upper cover 2 is connected to an upper end of the valve body 1, a lower cover 3 is connected to a lower end of the valve body 1, four channels are disposed on a side wall of the valve body 1, and a valve core 4 is disposed inside the valve body 1.
In this embodiment, open four passageways D, E, S, C on the lateral wall in valve body 1 lower part, the non-90 equipartition of four passageways, case 4 is located inside valve body 1, case 4 is located valve body 1 lower part lateral wall passageway position, be well baffle 5 in the middle of the case 4, the two sides arc of well baffle 5, for fluid curved surface shape, and eccentric settings, well baffle 5 upside is last baffle 6, well baffle 5 downside is baffle 7 down, it forms for the semi-circular amalgamation of size with baffle 7 down to go up baffle 6, it goes out axle 8 to go up baffle 6 upside, baffle 7 downside is equipped with down and goes out axle 9 down.
In this embodiment, the length of the valve body 1 extends upward, and the upper cover body 2 becomes shorter and finally becomes a plane.
In this embodiment, a movable stopper 27 is disposed at the position of the upper shaft 8 of the valve element 4, a fixed limit stopper 28 is disposed on the upper surface of the upper bearing cap 13, and when the valve element 4 rotates to a predetermined position, the movable stopper 27 contacts with the fixed limit stopper 28, so as to perform mechanical limit.
In this embodiment, the radial direction of the upper output shaft 8 and the lower output shaft 9 is provided with a side pushing position element 10, the side pushing position element 10 has no elasticity, and the thrust direction is the eccentric direction of the middle partition plate 5, so that the valve core 4, the upper baffle 6, the lower baffle 7 and the middle partition plate 5 are tightly attached to the inner wall of the valve body 1. The side pushing position part 10, the upper output shaft 8 and the lower output shaft 9 are combined into a whole, an upper bearing 11 and a lower bearing 12 are arranged outside the side pushing position part 10, the upper bearing 11 and the lower bearing 12 are tapered roller bearings, an upper bearing cover 13 and a lower bearing cover 14 are respectively arranged outside the upper bearing 11 and the lower bearing 12, and a direct-acting bearing is arranged between the outer wall of the lower bearing cover 14 and the inner wall of the valve body 1 and can move up and down.
In this embodiment, a disc spring is arranged between the lower portion of the lower bearing cover 14 and the lower cover body 3, the disc spring provides upward thrust for the lower bearing cover 14, under the action of the disc spring, if the valve core 4 is worn, the disc spring thrust pushes the lower bearing cover 14 to move upward, the upper bearing cover 13 pushes the tapered roller bearing outer ring, the bearing outer ring acts on the bearing inner ring, and the outer wall of the valve core 4 and the inner wall of the valve body 1 are compressed and sealed because the rotating circle center of the valve core 4 and the circle center of the outer circumference of the valve core 4 are not the same.
In this embodiment, the lower output shaft 9 of the valve element 4 is led out through a middle hole of the lower bearing cover 14, the lower portion of the lower output shaft 9 is provided with the sensing plate 18, the sensing plate 18 is provided with two magnetic blocks 19, the lower cover body 3 is provided with a sensor blind hole, a magnetic sensor is arranged in the sensor blind hole, the magnetic sensor and the magnetic blocks 19 are in a corresponding relationship and are distributed on a circumference, the magnetic blocks 19 can be driven by the valve element 4 to rotate, and the embodiment has two sensors, namely a heating sensor and a refrigerating sensor.
In this embodiment, a driving assembly 15 is disposed above the upper bearing cover 13, an output shaft of the driving assembly 15 is connected to the upper output shaft 8, a power supporting plate 16 is disposed in the middle of the valve body 1, the driving assembly 15 is fixed to the power supporting plate 16, the driving assembly 15 is composed of a motor and a speed reducer, and the motor is provided with a braking or damping mechanism and an overload and overheat protector.
Specifically, the driving assembly 15 is provided with a leading-out wire, the upper part of the upper cover body 2 is provided with a hole, a terminal board 17 is arranged in the hole, a terminal post is arranged on the terminal board 17, the lower terminal post is connected with the leading-out wire of the driving assembly 15, and a terminal board sealing member 22 is arranged between the terminal board 17 and the upper cover body 2.
In this embodiment, be equipped with wear-resisting sealing member material on case 4 outer wall, the first-selected copper sheathing of wear-resisting sealing member, the porose graphite that inlays of copper sheathing.
In this embodiment, a maintenance sealing member 21 is disposed at a position where the upper output shaft 8 and the upper bearing cover 13 are engaged, a maintenance sealing member 21 is disposed at a position where the lower output shaft 9 and the lower bearing cover 14 are engaged, the maintenance sealing member 21 is an O-ring, a terminal plate sealing member 22 is disposed between the terminal plate 17 and the upper cover 2, a fitting sealing member 23 is disposed at a position where the upper surface of the valve body 1 and the upper cover 2 are engaged, and a position where the valve body 1 and the lower cover 3 are engaged, and the fitting sealing member 23 is an O-ring.
In this embodiment, a terminal protection cover is provided outside the terminal board 17, a hole is provided on the side surface of the terminal board 17, and a lead wire is connected to the upper end of the terminal board 17, led out through a sensor side hole of the terminal board 17, and led into a terminal box provided in the middle of the valve body 1. A sensor protective cover is arranged outside the sensor, a hole is formed in the side face of the sensor protective cover, and a sensor lead is led out through the side hole of the sensor protective cover and led into a junction box arranged in the middle of the valve body 1.
When the four-way valve with the pre-bias structure works, the initial state is a heating state, the channels are DC-conducted and SE-conducted, the magnetic blocks 19 on the sensing plate 18 correspond to the heating sensor groups, control signals are output, the refrigerating sensor groups do not correspond to the magnetic blocks 19 and do not output signals, when the refrigerating state is required, namely the DE-conducted and SC-conducted state is converted, the refrigerating sensor groups do not have in-place signals, an external control circuit supplies power to the driving assembly 15, the driving assembly 15 rotates to drive the valve core 4 to rotate, the valve core 4 drives the sensing plate 18 to rotate, the magnetic blocks 19 on the sensing plate 18 also rotate, when the magnetic blocks 19 correspond to the refrigerating sensor groups, signals are output, the channels are DE-conducted and SC-conducted, after the control system receives the signals of the refrigerating sensor groups, the power supply to the driving assembly 15 is stopped, and the valve core 4 stops.
If the heating state needs to be switched back again, and the heating sensor does not output a signal, the driving circuit enables the electric driving assembly 15 to rotate reversely until the valve core 4 rotates to the heating state, the heating sensor corresponds to the magnetic block 19 to generate a heating in-place signal, and the driving circuit enables the motor to stop rotating. At this time, the heating state is recovered, the channel DC is conducted, and the channel SE is conducted.
Example 3
Referring to fig. 7, embodiment 3 of the present invention provides a four-way valve with a pre-biased structure, in which a sensor is disposed at a middle position in a valve body 1, the sensor adopts a touch switch, a hole is formed in a side wall of an upper cover body 2 and a terminal board 17 is mounted, and a lead of a driving assembly 15 and a lead of the sensor are led out from the terminal board 17.
Specifically, in this embodiment, a control channel K is opened above the upper bearing cap 13, the control channel K is connected to a control valve, and the control channel K is also opened between the lower bearing cap 14 and the lower cap body 3 and connected to the control valve. Meanwhile, a sealing element and a bearing are arranged between the upper bearing cover 13 and the valve body 1 and between the lower bearing cover 14 and the valve body 1, so as to move up and down conveniently.
When the pressure-compensating valve works, the pressure is applied to the upper bearing cover 13 and the lower bearing cover 14 through the control valve, then the pressure is transmitted to the tapered roller bearing, and the rotating circle center of the valve core 4 is eccentric with the circle center of the excircle of the valve core 4, so that the excircle of the valve core 4 is tightly attached to the inner wall of the valve body 1, the abrasion is compensated, the sealing is more facilitated, and the leakage is prevented.
In this embodiment, the lower shaft 9 of the valve core 4 is led out through a hole in the middle of the lower bearing cap 14, the lower part of the lower shaft 9 is provided with a movable stop 27, the lower bearing cap 14 is provided with a fixed limit stop 28, the movable stop 27 corresponds to the fixed limit stop 28, and the movable stop 27 can be driven by the valve core 4 to rotate and is limited and stopped through the fixed limit stop 28, so as to realize mechanical limitation.
In this embodiment, a viewing mirror 29 is disposed at the middle position of the lower cover 3 or on the sidewall of the valve body 1, and the valve core 4 is marked to view the rotation of the valve core 4.
In this embodiment, a friction-resistant sealing material is arranged at a position where the inner wall of the valve body 1 is matched with the valve core 4, and the friction-resistant sealing material is a composite copper sleeve or other friction-resistant materials.
In this embodiment, the middle partition plate 5 of the valve core 4 is in a curved fluid shape to reduce the resistance of the fluid.
In this embodiment, in order to reduce the upward thrust of the lower bearing cap 14, a reducing sleeve is added between the lower bearing cap 14 and the valve body 1. Meanwhile, sealing O-shaped rings are arranged between the upper bearing cover 13 and the lower bearing cover 14 and the valve body respectively for sealing.
The working principle of this embodiment 3 is the same as that of embodiment 1, and will not be described again here.
Example 4
Referring to fig. 8 and 9, in embodiment 4 of the invention, a pre-biased four-way valve is provided, in which a side pushing component 10 is disposed on an opposite side of a semicircular valve core 4, five channels are formed on a side wall of a valve body 1, the five channels are non-uniformly distributed, and the valve core 4 blocks one channel to ensure that the other four channels are communicated with each other two by two.
In this embodiment, the upper bearing 11 and the lower bearing 12 are tapered roller bearings, a disc spring is arranged between an outer ring of the upper bearing 11 and the upper bearing cover 13, and the axial pushing action of the disc spring causes the valve core 4 to be pressed against the inner wall of the valve body 1.
In this embodiment, the valve core 4 is externally provided with a copper sleeve, the copper sleeve is provided with a hole, a graphite rod is arranged in the hole, the lower cover body 3 is sealed with the valve body 1 by an O-ring, and the upper cover body 2 is sealed with the valve body 1 by an O-ring.
The working principle of this embodiment 4 is the same as that of embodiment 1, and will not be described herein again.
Example 5
Referring to fig. 10 and 11, in embodiment 5 of the present invention, a pre-biased four-way valve is provided, where a channel J is formed between a valve core 4 and an upper output shaft 8, the channel J is communicated with an eccentric semicircular portion of the valve core 4, a channel L is formed on an upper bearing cover 13, the channel L is communicated with a defect semicircular position of the valve core 4, a valve head 26 is arranged at a position corresponding to the channel L, a rotating plate 25 is arranged on the upper output shaft 8 of the valve core 4, the valve head 26 is mounted on the rotating plate 25, a pre-pressure spring is arranged between the rotating plate 25 and the valve head 26, the pre-pressure spring presses on the valve head 26, the rotating plate 25 is connected with the output shaft of a driving assembly 15, and the valve head 26 and.
In this embodiment, the middle of the upper output shaft 8 of the valve core 4 is provided with a hole, a driving pin shaft 30 is arranged between the middle hole and the outer circle of the upper output shaft 8, the rotating plate 25 is fan-shaped, the driving assembly 15 firstly drives the fan-shaped rotating plate 25 to rotate, and opens the communication between the valve head 26 and the channel L, and then when the rotating plate 25 touches the driving pin shaft 30, the valve core 4 is driven to rotate in the forward and reverse directions.
In this embodiment, a bearing and a seal are provided between the upper bearing cap 13 and the valve body 1, and can move up and down. An anti-rotation pin 24 is provided on the upper bearing cap 13, and the anti-rotation pin 24 is connected to the power support plate 16 or to the valve body 1 to prevent the upper bearing cap 13 from rotating.
It will be apparent to those skilled in the art that the rotating plate 25 may also be designed with a movable stop 27 for mechanical retention.
It will be readily appreciated by those skilled in the art that the drive assembly 15 can open the valve head 26 and the passage L, rotate the valve element 4 after a number of circumferential divisions, and then close the valve head 26 and the passage L.
It will be readily appreciated by those skilled in the art that the side thrust member 10 may be replaced by an eccentric sleeve.
As will be readily appreciated by those skilled in the art, the driving connection of the driving shaft and the valve core may be realized by adopting an internal and external thread connection, or by adopting a multi-stage thread connection, so as to facilitate the compression or separation of the inner ring and the outer ring of the conical bearing.
Although the invention has been described in detail above with reference to a general description and specific examples, it will be apparent to one skilled in the art that modifications or improvements may be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. A four-way valve with a pre-biased structure comprises a valve body (1), wherein the upper end of the valve body (1) is connected with an upper cover body (2), the lower end of the valve body (1) is connected with a lower cover body (3), four channels are arranged on the side wall of the valve body (1), and a valve core (4) is arranged inside the valve body (1); it is characterized in that the preparation method is characterized in that,
the valve core (4) comprises a middle partition plate (5), an upper baffle plate (6) and a lower baffle plate (7), the middle partition plate (5) is one of a flat plate shape, an arc shape, an arch fluid curved surface or a pipeline elbow shape, and the middle partition plate (5) is positioned at an eccentric position between the upper baffle plate (6) and the lower baffle plate (7);
an upper output shaft (8) is connected to the upper side of the upper baffle (6), a lower output shaft (9) is connected to the lower side of the lower baffle (7), and side pushing positioning pieces (10) are arranged in the radial directions of the upper output shaft (8) and the lower output shaft (9); the upper output shaft (8) is provided with an upper bearing (11), the lower output shaft (9) is provided with a lower bearing (12), the upper bearing (11) and the lower bearing (12) are both positioned at the outer side of the side pushing and positioning piece (10), and the side pushing and positioning piece (10) enables the geometric circle center of the valve core (4) and the rotating circle center of the valve core (4) to generate eccentricity; an upper bearing cover (13) is arranged on the outer side of the upper bearing (11), and the outer wall of the upper bearing cover (13) is matched with the inner wall of the valve body (1); a lower bearing cover (14) is arranged on the outer side of the lower bearing (12), and the outer wall of the lower bearing cover (14) is matched with the inner wall of the valve body (1);
a driving assembly (15) is arranged above the upper bearing cover (13), and a power shaft of the driving assembly (15) is connected with the upper output shaft (8); a power supporting plate (16) is arranged in the valve body (1), and a driving assembly (15) is fixed on the power supporting plate (16) or directly fixed on the upper bearing cover (13); the drive assembly (15) is provided with an outgoing line, the upper cover body (2) is connected with a terminal board (17), the terminal board (17) is connected with a binding post, and the lower part of the binding post is connected with the outgoing line of the drive assembly (15);
the lower output shaft (9) is led out through a middle hole of the lower bearing cover (14), a sensing plate (18) is arranged at the lower part of the lower output shaft (9), and the sensing plate (18) is provided with a magnetic block (19); the lower cover body (3) is provided with a sensor blind hole (20), a sensor is arranged in the sensor blind hole (20), and the magnetic block (19) rotates along with the valve core (4) and is sensed by the sensor.
2. The four-way valve with a pre-biased structure according to claim 1, wherein the upper baffle (6) and the lower baffle (7) are both semicircular, and the central angles of the upper baffle (6) and the lower baffle (7) are less than 180 °.
3. The four-way valve with the pre-biased structure as claimed in claim 1, wherein the upper output shaft (8) and the upper bearing cover (13) are provided with maintenance seals (21) at the matching position, and the lower output shaft (9) and the lower bearing cover (14) are provided with maintenance seals at the matching position; a terminal plate sealing element (22) is arranged between the terminal plate (17) and the upper cover body (2);
the upper surface of the valve body (1) and the matching surface of the upper cover body (2) as well as the matching surface of the valve body (1) and the lower cover body (3) are provided with matching sealing pieces (23).
4. The four-way valve with the pre-biased structure according to claim 1, wherein the upper bearing (11) and the lower bearing (12) are tapered roller bearings or tapered sliding bearings, and a spring is provided at any position of the lower part of the lower bearing cover (14), the upper part of the upper bearing cover (13), the inner ring of the tapered roller bearing or the outer ring of the tapered roller bearing, and the spring is a disc spring or a wave spring or a compression spring.
5. The four-way valve with the pre-biased structure as claimed in claim 4, wherein at least one control channel K is arranged on the lower portion of the lower bearing cover (14), the upper portion of the upper bearing cover (13) or the side wall of the valve body (1), the control channel K is connected with a control valve, the control valve is one of a solenoid valve, a four-way valve, a three-way valve, a ball valve or a gate valve, and the control valve is connected with a high-pressure source or a low-pressure source.
6. The four-way valve with the pre-biased structure is characterized in that at least one channel J is arranged at the position of the upper output shaft (8) or the lower output shaft (9), and the channel J is communicated with the cavity of the semicircular part of the valve core (4);
the lower bearing cover (14) or the upper bearing cover (13) is provided with an anti-rotation pin (24), one end of the anti-rotation pin (24) is connected with the lower bearing cover (14) or the upper bearing cover (13), and the other end of the anti-rotation pin (24) is connected with the valve body (1) or the power supporting plate (16);
the lower bearing cover (14) or the upper bearing cover (13) is at least provided with a pore channel L, the channel L is communicated with a semicircular defect part of the valve core (4), the output shaft of the driving assembly (15) is provided with a rotating plate (25), the rotating plate (25) is provided with a valve head (26), the valve head (26) is provided with a pre-pressing spring, and the valve head (26) is driven by the rotating plate (25) to open and close the pore channel L.
7. The pre-biased structure four-way valve according to claim 1, wherein the driving assembly (15) comprises a motor and a reducer, the reducer is any one of a planetary reducer, a worm reducer, a hard tooth surface reducer, a harmonic reducer and a cycloidal reducer, and the motor is any one of a direct current motor, an alternating current motor, a permanent magnet motor, a stepping motor, a servo motor and a magnetic coupling;
the sensor is a magnetic sensor, a photoelectric sensor or a mechanical switch, the sensor is arranged in the middle of the valve body (1) or on the side wall of the valve body (1), the number of the sensors is at least one, and the number of the magnetic blocks (19) corresponding to the sensors is at least one.
8. A four-way valve of a pre-biased structure according to claim 1, wherein a terminal protection cover is provided outside the terminal plate (17), a side surface of the terminal protection cover has a hole, and a lead of the terminal plate (17) is led out to a terminal box provided at a side portion of the upper cover body (2) through the terminal plate (17) side hole;
a sensor protective cover is arranged outside the sensor, a hole is formed in the side face of the sensor protective cover, and a lead of the sensor is led out to a junction box arranged at the side part of the upper cover body (2) through the hole of the sensor protective cover;
or the terminal board (17) is arranged at the side part of the valve body (1), and the sensor is arranged at the middle part or the side wall in the valve body (1).
9. The four-way valve with the pre-biased structure according to claim 1, wherein a wear-resistant sealing member is arranged at a matching position on the outer wall of the valve core (4) or the inner wall of the valve body (1) close to the valve core (4), and the wear-resistant sealing member is made of a composite material, an alloy or a polytetrafluoroethylene polymer material;
the wear-resistant sealing element adopts a copper sleeve, and a hole made of a lubricating material is embedded in the copper sleeve; the wear-resistant sealing element is assembled in a mode of embedding, casting, welding or spraying.
10. The four-way valve with the pre-biased structure as claimed in claim 1, wherein a movable stopper (27) is arranged at the lower part of the lower output shaft (9), and a fixed limit stopper (28) is arranged on the lower cover body (3) or the lower bearing cover (14); the movable stop block (27) is limited and stopped by the fixed limit stop block (28) in the rotating process of the valve core (4);
and a sight glass (29) is arranged at the middle position of the lower cover body (3) or on the side wall of the valve body (1).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110283390.8A CN112855984A (en) | 2021-03-17 | 2021-03-17 | Pre-biased structure four-way valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110283390.8A CN112855984A (en) | 2021-03-17 | 2021-03-17 | Pre-biased structure four-way valve |
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| Publication Number | Publication Date |
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| CN112855984A true CN112855984A (en) | 2021-05-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110283390.8A Pending CN112855984A (en) | 2021-03-17 | 2021-03-17 | Pre-biased structure four-way valve |
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Citations (6)
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|---|---|---|---|---|
| JPH0221077A (en) * | 1988-07-08 | 1990-01-24 | Nippon Boorubarubu Kk | Four-way ball valve |
| US5755427A (en) * | 1996-02-23 | 1998-05-26 | Naf Ab | Self adjusting ball valve assembly |
| JP2002022041A (en) * | 2000-07-11 | 2002-01-23 | Saginomiya Seisakusho Inc | Four way valve |
| CN108167501A (en) * | 2018-03-07 | 2018-06-15 | 贾培育 | A kind of electric four-way valve |
| EP3369973A1 (en) * | 2017-03-03 | 2018-09-05 | LK Armatur AB | Regulating valve |
| CN214579036U (en) * | 2021-03-17 | 2021-11-02 | 烟台佳仕阀泵有限公司 | Pre-biased structure four-way valve |
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2021
- 2021-03-17 CN CN202110283390.8A patent/CN112855984A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0221077A (en) * | 1988-07-08 | 1990-01-24 | Nippon Boorubarubu Kk | Four-way ball valve |
| US5755427A (en) * | 1996-02-23 | 1998-05-26 | Naf Ab | Self adjusting ball valve assembly |
| JP2002022041A (en) * | 2000-07-11 | 2002-01-23 | Saginomiya Seisakusho Inc | Four way valve |
| EP3369973A1 (en) * | 2017-03-03 | 2018-09-05 | LK Armatur AB | Regulating valve |
| CN108167501A (en) * | 2018-03-07 | 2018-06-15 | 贾培育 | A kind of electric four-way valve |
| CN214579036U (en) * | 2021-03-17 | 2021-11-02 | 烟台佳仕阀泵有限公司 | Pre-biased structure four-way valve |
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