JP4142387B2 - Electric rotary flow path switching valve and refrigeration cycle apparatus for refrigeration / refrigerator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric rotary flow path switching valve and a refrigeration cycle apparatus for a refrigeration / refrigerator, and more particularly, to a refrigerant circuit switching of a refrigeration cycle apparatus for a refrigeration / refrigerator of the type that defrosts an evaporator with refrigerant discharge gas heat. The present invention relates to a motor-driven rotary flow path switching valve and a refrigeration cycle apparatus for a refrigeration / refrigerator.
[0002]
[Prior art]
Instead of using a heater to remove frost that has formed on the evaporator of a household refrigerator (freezer / refrigerator), the high-temperature refrigerant discharge gas discharged from the compressor is directly applied to the evaporator. It has already been proposed to use the heat of the refrigerant discharged gas. Switching of the refrigerant circuit for directly flowing the high-temperature refrigerant discharge gas discharged from the compressor into the evaporator can be performed by a three-way valve that is a flow path switching valve.
[0003]
The three-way valve has a valve body that is rotationally driven (directly driven) by a stepping motor, and the valve body is rotationally displaced at one end surface with respect to the valve seat surface, thereby opening a plurality of valve seat surfaces. 2. Description of the Related Art There is known an electric rotary flow path switching valve that opens and closes individual valve ports in a predetermined combination and performs flow path switching by opening and closing the valve ports (for example, Patent Documents 1 and 2).
[0004]
In addition, the electric rotary flow path switching valve has a pilot valve so that the main valve body can be lifted from the valve seat surface during rotation of the main valve body that performs flow path switching, and the valve body can rotate with low resistance. (For example, Patent Document 3), prior to the rotational displacement of the main valve for switching the flow path, the pressure equalization hole formed in the main valve is opened by the sub-valve to eliminate the differential pressure inside and outside the main valve, There is one in which the rotational displacement of the valve is easily performed (for example, Patent Documents 4 and 5).
[0005]
[Patent Document 1]
JP 2001-153492 A
[Patent Document 2]
JP 2002-122366 A
[Patent Document 3]
JP 2000-46229 A
[Patent Document 4]
JP 2001-295951 A
[Patent Document 5]
JP 2002-13843 A
[0006]
[Problems to be solved by the invention]
In the conventional electric rotary flow path switching valve as described above, the valve ports are connected to or disconnected from each other by the partition wall or communication groove formed on the end face of the valve body (main valve body, main valve). In response to the flow rate, due to its valve structure, the valve device becomes large, compact, and a device that can handle a large flow rate cannot be obtained.
[0007]
In the direct acting type, when the valve diameter increases with the increase in flow rate, the valve driving load increases accordingly, and it is necessary to increase the power of the stepping motor that rotates the valve body. Increases power.
[0008]
With a pilot valve or sub-valve, when the main valve body rotates, the main valve body floats from the valve seat surface, eliminating the differential pressure inside and outside the main valve. Although not noticeable, there are various problems such as loss of quietness due to the attracting sound of the electromagnet, and difficulty in obtaining a stable operation guarantee and durability guarantee due to the structure.
[0009]
The present invention has been made to solve the above-described problems, and is capable of handling a large flow rate without causing an increase in the size of the valve device and an increase in power consumption. In addition, a loud operation sound is generated during the switching operation. An object of the present invention is to provide an electric rotary flow path switching valve and a refrigeration cycle apparatus for a refrigeration / refrigerator that are excellent in quietness, stable in operation and durable.
[0010]
[Means for Solving the Problems]
  In order to achieve the above-described object, an electric rotary flow path switching valve according to the present invention includes:Having a valve seat surface,Each channel is connectedOnePrimary sidePort and twoSecondary sideConnectionportTogaA fixed side member formed;A case which is airtightly mounted on the fixed side member and cooperates with the fixed side member to form a valve chamber / rotor chamber of an airtight chamber structure inside; and the fixed side member is hermetically sealed in the valve chamber / rotor chamber Attached to the valve chamber and rotor chamber,The fixed side member1 on the sideSecondary sideRoom,The other sideThe paIlotThe room and the wardShareIt has a cylindrical part that protrudes toward the pilot chamber at the center.A partition member;Received in the cylindrical part and rotatable.Supports movement in the axial directionA cylindrical piece, a tongue piece protruding laterally on one end side of the cylindrical part in the primary side chamber, and the tongue piece part penetrating in the axial direction of the cylindrical part.Pilot pawTo andHaveThe cylindrical partBy rotating around the central axis ofThe tongue pieceAtTwoSecondary sideConnectionPortIn a conflicting relationshipA main valve body that opens and closes and switches the flow path; andThe cylindrical portion protruding from the cylindrical portion to the pilot chamber side is rotatably disposed concentrically with the main valve body, and is in sliding contact with the end surface on the other end side.Open and close the pilot portHas hourglassA pilot valve body,A pressing force is applied to the hourglass portion against the end surface on the other end side and the tongue piece portion against the valve seat surface.Biasing means;Given the gap between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the cylindrical portion, the pilot chamber and the primary side chamber are connected to each other in a state where the pilot port is closed by the hourglass portion. The fixed throttle passage that is always in communication and the outer periphery of the case are positioned and fixedA stator coil;Provided rotatably in the pilot chamberA stepping motor having a rotor,The rotor has a cylindrical plastic magnet whose outer peripheral portion is magnetized, a central shaft that is insert-molded in the boss portion of the plastic magnet, and a circumferential portion of the inner peripheral surface of the plastic magnet. An integrally formed key-shaped valve drive protrusion, and is rotatably supported on the ceiling of the case at one end of the central shaft and of the central shaft passing through the central hole of the pilot valve body The other end is provided to be supported by the center hole of the cylindrical portion.The pilot port on one sideAboveCommunicating with the pilot chamber, on the other hand, depending on the rotational position of the main valve elementClosedSelectedSecondary side connection portCommunicate with,The main valve body isBy the contact of the drive protrusion with the engagement end surface of a substantially semicircular cutout formed on the side of the cylindrical portion opposite to the side from which the tongue piece is projected.The pilot valve body is rotationally displaced to a specified rotational position that is connected to the rotor so as to be capable of relative rotational displacement only by a predetermined rotational angle in forward and reverse rotational directions, and establishes flow path switching.By engagement of the valve drive projection with a keyway formed in the pilot valve bodyThe rotor is always connected to rotate integrally with the rotor, and the main valve body is at the rotor rotation angle position at the specified rotation position.HourglassCloses the pilot port and opens the pilot port prior to the rotational displacement of the main valve element.
[0012]
  According to the electric rotary flow path switching valve according to the present invention, the main valve body is in the specified rotational position.At the tongue pieceWhen the valve port is opened and closed and the flow path switching is established, the pilot valve bodyHourglass partByOf the cylindrical part of the main discPilot port is closed. Therefore, in the flow path switching established state, the pilot chamber is at the same pressure as the primary side chamber due to the constantly communicating throttle passage,The hourglass portion of the pilot valve body is pressed against the end face on the other end side of the cylindrical portion by the biasing force of the biasing means, and the tongue piece portion of the main valve body isFixed side member sidePressed against the valve seat surface,Valve cutoff is obtained.
[0013]
  When switching the flow path, pilot valve body prior to rotational displacement of the main valve bodyHourglass partAs a result, the pilot port is opened, the pilot chamber communicates with the secondary valve port, and the pilot chamber has a secondary pressure lower than the primary pressure. As a result, there is a pressure difference at both ends of the main valve body.Tongue pieceThe force in the direction away from the fixed side member acts on the main valve body,TongueIs pressed against the fixed side member (valve seat surface), and the rotational displacement for switching the flow path of the main valve body thereafter is performed with low resistance.
[0015]
  To achieve the above object, a refrigeration cycle apparatus for a refrigeration / refrigerator according to the present invention includes a compressor, a condenser, a flow rate adjusting means, an evaporator, and a refrigerant passage connecting them. In the refrigeration cycle apparatus for the above-mentioned, it has an electric rotary flow path switching valve as the above-mentioned three-way valve,AboveA primary port is connected to the discharge port of the compressor;The twoSecondary sideConnectionportOne ofIs connected to the condenser,The otherThe condenserIpasToIpasThe refrigerant passage is directly connected to the evaporator.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below in detail with reference to the accompanying drawings.
1 to 4 show an embodiment of an electric rotary flow path switching valve according to the present invention.
[0017]
  As shown in FIG. 1, the electric rotary flow path switching valve 10 is a disk-shaped bottom lid member 11 which is a fixed side member, and airtightly welded or brazed onto the bottom lid member 11.AttachedAnd a can-shaped case 12. The case 12 cooperates with the bottom cover member 11 to form a valve chamber / rotor chamber 13 having an airtight chamber structure inside.
[0018]
An A port (primary side port) 14 and secondary side connection ports 15 and 16 are formed through the bottom lid member 11. Joint pipes 17, 18 and 19 are connected to the primary side port 14 and the secondary side connection ports 15 and 16, respectively.
[0019]
As shown in FIG. 2, the base plate 20 is positioned and brazed on the bottom lid member 11 (the valve chamber / rotor chamber 13 side) by fitting the alignment embosses 11A and 20A. The base plate 20 is formed with a through hole 21 having an expanded portion 21A and communicating with the secondary side connection port 15, and a through hole 22 having an expanded portion 22A and communicating with another secondary side connection port 16. Has been.
[0020]
On the base plate 20, stopper pieces 23 and 24 are formed so as to be raised at positions mutually displaced by 180 degrees around the central axis.
[0021]
On the base plate 20, the valve seat plate 25 is positioned by fitting the alignment emboss 20 </ b> A and the positioning notch 25 </ b> A, and is bonded and bonded with a refrigerant-resistant adhesive. The valve seat plate 25 has a valve seat surface 25 </ b> B on the top surface, and a B port (first secondary port) 26 communicating with the secondary connection port 15 through the through hole 21 and the through hole 22. A C port (second secondary port) 27 that communicates with another secondary connection port 16, a B port pilot port 28 that communicates with the secondary connection port 15 by the expansion unit 21A, and an expansion unit 22A As a result, a C port pilot port 29 communicating with the secondary side connection port 16 is formed therethrough.
[0022]
The B port 26 and the C port 27, and the B port pilot port 28 and the C port pilot port 29 are respectively located at rotationally displaced positions by a predetermined angle on the same arc line around the central axis. Pilot port 28, C port 27 and C port pilot port 29 are at the same rotational angle position. The primary side port 14 is in direct communication (always communicating) with the valve chamber / rotor chamber 13 (a primary side chamber 13A described later) due to the outer shape of the base plate 20 and the valve seat plate 25.
[0023]
  Therefore, the fixed side member (bottom lid member 11) has the valve seat surface 25B of the valve seat plate 25 integrated with the bottom lid member 11 via the base plate 20 as a valve seat surface.On the valve seat surface 25B of the valve seat plate 25, the main valve body 30 is provided so as to be rotatable around the central axis and movable in the axial direction. The main valve body 30 has a cylindrical portion 31 and a tongue piece portion 32 protruding laterally on the lower end side of the cylindrical portion 31, and is seated on the valve seat surface 25B with a lower bottom surface 32A of the tongue piece portion 32. Center axis of body 30That is, the central axis of the cylinderBy rotating around, the B port 26 and the C port 27 are opened and closed in a contradictory relationship.
[0024]
As shown in FIGS. 3 and 4, the main valve body 30 is provided with a stopper surface 30 </ b> B that defines the maximum rotation position of the main valve body 30 in the clockwise direction by coming into contact with the stopper piece 23. A stopper surface 30 </ b> C that defines the maximum rotational position of the main valve body 30 in the counterclockwise direction is formed by contacting the two stopper pieces 24.
[0025]
  As shown in FIG. 1, the main valve body 30 includesAdjacent to the tongue 32Column part 31 up and downThat is, in the axial direction of the cylindrical portion 31A penetrating pilot port (passage) 36 is formed. On the one hand, the pilot port 36 communicates with a pilot chamber 13B, which will be described later, and on the other hand, it communicates with the B port pilot port 28 or the C port pilot port 29 in alignment with the rotational position of the main valve body 30, via this. It communicates with the secondary side connection port 15 or 16.
[0026]
  An inner shell 33 as a partition member is hermetically welded in the case 12.Attached airtightYes. The inner shell 33 receives the cylindrical portion 31 of the main valve body 30 at the cylindrical portion 34, and the main valve body 30.Cylinder part 31At the same time as rotating in the axial direction, and at the same time, in the valve chamber / rotor chamber 13 in cooperation with the cylindrical portion 31, the primary side on the side of the bottom cover member 11 and the valve seat plate 25. It is divided into a side chamber 13A and a pilot chamber 13B on the opposite side.The cylindrical portion 34 of the inner shell 33 protrudes toward the pilot chamber 13B at the center thereof as shown in the figure.
[0027]
There is a fitting portion gap (clearance) 35 between the inner peripheral surface of the cylindrical portion 34 of the inner shell 33 and the outer peripheral surface of the column portion 31 of the main valve body 30, and this fitting portion gap 35 is the primary side chamber. A throttling passage that always communicates 13A and the pilot chamber 13B is formed. The cross section of the throttle passage is set to a value smaller than the aperture area of the pilot port 36 or a system optimum value.
[0028]
  As shownIn the pilot room 13BOn the upper end side of the cylindrical portion 31 protruding from the cylindrical portion 34 to the pilot chamber 13B sideA pilot valve 37 is rotatably disposed concentrically with the main valve body 30. The pilot valve 37 has a hourglass portion 37A on the bottom surface side, and opens and closes the pilot port 36 by slidingly contacting the upper end surface 31A of the cylindrical portion 31 of the main valve body 30 by the hourglass portion 37A.
[0029]
A rotor 51 of a stepping motor 50 is rotatably provided in the valve chamber / rotor chamber 13 (pilot chamber 13B). The rotor 51 is a plastic magnet in which the outer peripheral portion 51A is magnetized in multiple poles, and the central shaft 52 is insert-molded in the boss portion 51B.
[0030]
  A bearing member 53 is fitted and attached to the upper end portion of the central shaft 52. The bearing member 53 engages with the bearing recess 12A formed in the ceiling portion of the case 12 by the upper protrusion 53A, and the case 12On the ceiling ofIt is rotatably supported. The central shaft 52 passes through the central hole 37B of the pilot valve 37 and is fitted to the central hole 30A of the main valve body 30 at the lower end portion thereof.
[0031]
A key-shaped valve drive protrusion 54 is integrally formed at one place in the circumferential direction of the inner peripheral surface of the rotor 51. The drive protrusion 54 is engaged with a key groove 37 </ b> C formed in the pilot valve 37. By this engagement, the pilot valve 37 rotates integrally with the rotor 51.
[0032]
  The valve drive protrusion 54 isOn the opposite side of the side where the tongue piece 32 protrudesThe cylindrical part 31 of the main valve body 30Side ofIt contacts the engagement end surface 31C or 31D (see FIG. 2) of the substantially semicircular cutout 31B formed in the above. Thereby, the main valve body 30 is connected to the rotor 51 so as to be capable of relative rotational displacement only by a predetermined rotational angle in the forward and reverse rotational directions.
[0033]
A compression coil spring 38 as an urging means is attached between the boss portion 51 </ b> B of the rotor 51 and the pilot valve 37. The compression coil spring 38 presses the hourglass portion 37 </ b> A of the pilot valve 37 against the upper end surface 31 </ b> A of the cylindrical portion 31, and the lower bottom surface 32 </ b> A of the tongue piece portion 32 of the main valve body 30 on the valve seat surface 25 </ b> B of the valve seat plate 25. Pressed.
[0034]
A stator assembly 55 of the stepping motor 50 is positioned and fixed to the outer periphery of the case 12. The stator assembly 55 has two upper and lower stator coils 56, a plurality of magnetic pole teeth 57, an electrical connector portion 58, and the like, and is liquid-tightly sealed with a sealing resin 59.
[0035]
The stator assembly 55 is phase-matched by the positioning piece 60 provided on the stator assembly 55 engaging with the positioning recess 11B formed on the outer peripheral portion of the bottom cover member 11, and the retaining piece 61 is secured to the bottom. The lid member 11 is prevented from coming off by non-reverse engagement.
[0036]
Next, the operation of the electric rotary flow path switching valve 10 configured as described above will be described. FIG. 3B and FIG. 4B each show a state in which the main valve body 30 is at the specified rotational position and a predetermined flow path switching is established.
[0037]
In the state shown in FIG. 3 (b), the C port 27 is opened, the B port 26 is closed by the tongue piece 32, and the A port (primary port) 14 communicates with the C port 27. . This is called a flow path switching establishment state A.
[0038]
On the other hand, in the state shown in FIG. 4B, the B port 26 is opened, the C port 27 is closed by the tongue portion 32, and the A port (primary port) 14 is changed to the B port 26. Communicate. This is called a flow path switching establishment state B.
[0039]
In any of the flow path switching established states A and B in FIGS. 3B and 4B, the pilot port 36 is blocked by the pilot valve 37, and the B port pilot port 28 and the C port pilot port 29 are closed. Is closed.
[0040]
Therefore, in the flow path switching establishment state A or B, the pilot chamber 13B is separated from the primary side chamber 13A by the primary side pressure entering the pilot chamber 13B from the primary side chamber 13A by the fitting portion gap 35 which is a continuously communicating throttle passage. The main valve body 30 is pushed toward the valve seat plate 25 by the spring force of the compression coil spring 38, and the lower bottom surface (end surface) 32A of the tongue piece portion 32 of the main valve body 30 becomes the valve seat surface 25B. It is pressed and a valve cutoff is obtained.
[0041]
Note that, in any of the flow path switching establishment states A and B, the valve drive protrusion 54 of the rotor 51 is located at a rotation angle position just between the engagement end faces 31C and 31D of the main valve body 30. Further, since the stopper piece 23 side is at the initialization position, the stopper face 30B of the main valve body 30 is in contact with the stopper piece 23 in the flow path switching established state A shown in FIG.
[0042]
The switching operation of the flow path switching establishment state A → B will be described. In the flow path switching establishment state A shown in FIG. 3B, the stator coil 56 is energized, and the rotor 51 is rotated counterclockwise by a prescribed pulse (18 pulses). As a result, as shown in FIG. 3C, only the pilot valve 37 rotates in the counterclockwise direction together with the rotor 51, the pilot port 36 is opened, and the pilot chamber 13B is connected to the pilot port 36 and the B port. The secondary connection port 15 communicates with the pilot port 28 for use.
[0043]
By this communication, the pilot chamber 13B becomes a secondary side pressure lower than the primary side pressure of the primary side chamber 13A. As a result, a pressure difference is generated at both ends of the main valve body 30, and a force in the direction of pulling the main valve body 30 away from the valve seat plate 25 (force in the upward direction) acts on the main valve body 30. The load pressing the lower bottom surface 32A of the piece 32 against the valve seat surface 25B is reduced.
[0044]
At this time, whether or not the lower bottom surface 32A of the tongue piece portion 32 of the main valve body 30 is lifted from the valve seat surface 25B depends on the pressure condition and the size of the passage area of the pilot port 36 and the passage area of the fitting portion gap 35. It depends on the relationship. In any case, the load by which the lower bottom surface 32A of the tongue piece portion 32 of the main valve body 30 is pressed against the valve seat surface 25B is drastically reduced.
[0045]
Further, the rotor 51 is rotated counterclockwise by a prescribed pulse (18 pulses). By this rotation, as shown in FIG. 4A, the valve drive protrusion 54 of the rotor 51 abuts on the engagement end surface 31 </ b> D of the main valve body 30, and the main valve body 30 together with the rotor 51 is counterclockwise. The tongue piece 32 of the main valve body 30 moves from the alignment position with the B port 26 to a position aligned with the C port 27.
[0046]
The rotational displacement of the main valve body 30 is performed in a state where the load pressing the lower bottom surface 32A of the tongue piece portion 32 of the main valve body 30 against the valve seat surface 25B is drastically reduced. Displacement is performed smoothly with low resistance.
[0047]
The rotation of the main valve body 30 causes the pilot port 36 to switch from the communication state with the B port pilot port 28 to the communication state with the C port pilot port 29. Since the pilot valve 37 is also rotated in the same direction by the counterclockwise rotation of the rotor 51 at this time, the pilot port 36 remains open, and the pilot chamber 13B communicates with the secondary connection port 16. Yes. For this reason, the lower bottom surface 32A of the tongue piece portion 32 of the main valve body 30 may float above the valve seat surface 25B, and the C port 27 is not closed.
[0048]
From the above state, the rotor 51 is rotated in the clockwise direction by a prescribed pulse (−18 pulses). As a result, as shown in FIG. 4B, only the pilot valve 37 rotates in the clockwise direction together with the rotor 51, the pilot port 36 is closed, and the pilot chamber 13B is connected to the secondary side connection port 16. Communication is blocked.
[0049]
Thereby, the pilot chamber 13B becomes the same pressure as the primary side chamber 13A by the primary side pressure entering the pilot chamber 13B from the primary side chamber 13A by the fitting portion gap 35, and the main valve body 30 is the spring of the compression coil spring 38. The force is pushed toward the valve seat plate 25, the lower bottom surface (end surface) 32A of the tongue piece 32 of the main valve body 30 is pressed against the valve seat surface 25B, and the C port 27 is closed. Thereby, the flow path switching establishment state B is established in which the C port 27 is closed and the A port 14 communicates with the B port 26.
[0050]
Next, the switching operation of the flow path switching establishment state B → A will be described. The stator coil 56 is energized in the above-described flow path switching establishment B shown in FIG. 4B, and the rotor 51 is rotated in the clockwise direction by a prescribed pulse (−18 pulses). 4C, only the pilot valve 37 rotates in the clockwise direction together with the rotor 51, the pilot port 36 is opened, and the pilot chamber 13B is used for the pilot port 36 and the C port. The secondary connection port 16 communicates with the pilot port 29.
[0051]
By this communication, the pilot chamber 13B becomes a secondary side pressure lower than the primary side pressure of the primary side chamber 13A. As a result, a pressure difference is generated at both ends of the main valve body 30, and a force in the direction of pulling the main valve body 30 away from the valve seat plate 25 (force in the upward direction) acts on the main valve body 30. The load pressing the lower bottom surface 32A of the piece 32 against the valve seat surface 25B is reduced.
[0052]
Also at this time, whether or not the lower bottom surface 32A of the tongue piece portion 32 of the main valve body 30 is lifted from the valve seat surface 25B depends on the pressure conditions and the passage area of the pilot port 36 and the passage area of the fitting portion gap 35. It depends on the size relationship. In any case, the load by which the lower bottom surface 32A of the tongue piece portion 32 of the main valve body 30 is pressed against the valve seat surface 25B is drastically reduced.
[0053]
Further, the rotor 51 is rotated in the clockwise direction by a prescribed pulse (−18 pulses). By this rotation, as shown in FIG. 3A, the valve drive protrusion 54 of the rotor 51 contacts the engagement end surface 31 </ b> C of the main valve body 30, and the main valve body 30 together with the rotor 51 rotates in the clockwise direction. The tongue 32 of the main valve body 30 moves from the alignment position with the C port 27 to a position aligned with the B port 26.
[0054]
The rotational displacement of the main valve body 30 is also performed in a state where the load pressing the lower bottom surface 32A of the tongue piece portion 32 of the main valve body 30 against the valve seat surface 25B is drastically reduced. Displacement is also performed smoothly with low resistance.
[0055]
Further, the rotation of the main valve body 30 causes the pilot port 36 to switch from the communication state with the C port pilot port 29 to the communication state with the B port pilot port 28. Since the pilot valve 37 is also rotated in the same direction by the clockwise rotation of the rotor 51 at this time, the pilot port 36 remains open and the pilot chamber 13B communicates with the secondary connection port 15. . For this reason, the lower bottom surface 32A of the tongue piece 32 of the main valve body 30 may float above the valve seat surface 25B, and the B port 26 is not closed.
[0056]
From the state described above, the rotor 51 is rotated counterclockwise by a prescribed pulse (18 pulses). As a result, as shown in FIG. 3B, only the pilot valve 37 rotates in the counterclockwise direction together with the rotor 51, the pilot port 36 is closed, and the pilot chamber 13B is connected to the secondary side connection port 15. Communication with is interrupted.
[0057]
Thereby, the pilot chamber 13B becomes the same pressure as the primary side chamber 13A by the primary side pressure entering the pilot chamber 13B from the primary side chamber 13A by the fitting portion gap 35, and the main valve body 30 is the spring of the compression coil spring 38. The force is pushed toward the valve seat plate 25, the lower bottom surface (end surface) 32A of the tongue piece 32 of the main valve body 30 is pressed against the valve seat surface 25B, and the B port 26 is closed. As a result, the flow path switching establishment state A is established in which the B port 26 is closed and the A port 14 communicates with the C port 27.
[0058]
In the electric rotary flow path switching valve 10 having the above-described configuration, the A port 14 that is always in communication with the valve chamber / rotor chamber 13 (primary side chamber 13A) and the valve chamber / rotor chamber 13 (primary side chamber 13A) are opened. Since the B port 26 and the C port 27 are provided and the B port 26 and the C port 27 are opened and closed by the main valve body 30 in a mutually opposite relationship, the flow path is switched. Compared with the case of switching the flow path by connecting and shutting off the valve ports by the partition walls and communication grooves formed on the end face of), it can handle a large flow rate without increasing the size and can be compactly designed. become.
[0059]
Further, the rotational displacement of the main valve body 30 is performed in a state where the load pressing the lower bottom surface 32A of the tongue piece portion 32 of the main valve body 30 against the valve seat surface 25B is drastically reduced. The rotational displacement is smoothly performed with low resistance, the main valve body 30 can be rotationally driven with low torque, and even if the diameter is increased, the stepping motor 50 is not required to be powered up, resulting in an increase in power consumption. Nor.
[0060]
Next, one embodiment of a refrigeration cycle apparatus for a refrigeration / refrigerator according to the present invention will be described with reference to FIG. The refrigeration cycle apparatus of the refrigeration / refrigerator includes a compressor 101, a condenser 102, a capillary tube 103 as a flow rate adjusting means, an evaporator 104, an electric rotary flow path switching valve 10, and a refrigerant connecting them. Passages 105-107 are included.
[0061]
The A port of the electric rotary flow path switching valve 10 is connected to the discharge port 101 d of the compressor 101, the C port is connected to the condenser 102, and the B port is connected to the bypass refrigerant passage 109. The bypass refrigerant passage 109 bypasses the condenser 102 and directly connects the B port to the evaporator 104.
[0062]
When the electric rotary flow path switching valve 10 is in the flow path switching established state A, the circulation path of the compressor 101 → the condenser 102 → the capillary tube 103 → the evaporator 104 → the compressor 101 is established, and normal cooling is performed. Driving is performed.
[0063]
The freezer / refrigerator has a first chamber 111, a second chamber 112, and a third chamber 113. During the cooling operation, cold air is sent from the evaporator 104 to the first chamber 111 by the fan 114, and the first chamber 111 is It functions as a freezer, and cold air is sent to the second chamber 112 by opening and closing the damper 115 so that the second chamber 112 functions as a refrigerator compartment and the third chamber 113 functions as a vegetable chamber.
[0064]
When the electric rotary flow path switching valve 10 is switched to the flow path switching established state B, the discharge port 101 d of the compressor 101 is connected to the bypass refrigerant passage 109, and high-temperature and high-pressure refrigerant from the compressor 101 is passed through the bypass refrigerant path 109. Flowing directly to the evaporator 104, defrosting (defrosting) of the evaporator 104 is performed.
[0065]
FIG. 6 shows another embodiment of the refrigeration cycle apparatus for a refrigeration / refrigerator according to the present invention.
[0066]
In this embodiment, a capillary tube 103F for the freezer compartment, a capillary tube 103R for the freezer compartment, an evaporator 104F for the freezer compartment and an evaporator 104R for the freezer compartment are individually provided, and the freezer compartment is provided by the three-way switching valve 60. The capillary tube 103F for the evaporator and the refrigerant passage 106F of the evaporator 104F, and the capillary tube 103R for the refrigerator compartment and the refrigerant passage 106R of the evaporator 104R are switched. The refrigerator 104R for the refrigerator compartment and the evaporator 104F for the freezer compartment are connected by a check valve 116.
[0067]
The A port of the electric rotary flow path switching valve 10 is connected to the discharge port 101 d of the compressor 101, the C port is connected to the condenser 102, and the B port is connected to the bypass refrigerant passage 110. The bypass refrigerant passage 110 bypasses the condenser 102 and directly connects the B port to the evaporator 104F.
[0068]
When the electric rotary flow path switching valve 10 is in the flow path switching established state A, if the normal cooling operation is performed and the three-way switching valve 60 is switched to the freezer compartment capillary tube 103F side, The circulation path of the compressor 101 → condenser 102 → freezer compartment capillary tube 103F → freezer compartment evaporator 104F → compressor 101 is established, and the three-way selector valve 60 is switched to the refrigerator compartment capillary tube 103R side. If so, the circulation path of the compressor 101 → the condenser 102 → the capillary tube 103R for the refrigerator compartment → the evaporator 104R for the freezer compartment → the compressor 101 is established.
[0069]
As a result, while the three-way switching valve 60 is switched to the freezer compartment capillary tube 103F side, cool air is sent from the freezer compartment evaporator 104F to the third chamber 113 by the fan 114F, and is also used for the freezer compartment. Cold air is sent from the evaporator 104F to the third chamber 113 by the fan 114F, and while the three-way switching valve 60 is switched to the capillary tube 103R side for the refrigerator compartment, the evaporator 104R for the refrigerator compartment is used. Cold air is sent to the first chamber 111 by the fan 114R. Therefore, the first chamber 111 functions as a refrigeration chamber, the third chamber 113 functions as a freezing chamber, and the second chamber 112 functions as a vegetable chamber.
[0070]
On the other hand, when the electric rotary flow path switching valve 10 is switched to the flow path switching establishment state B, the discharge port 101d of the compressor 101 is connected to the bypass refrigerant passage 110, and the high-temperature and high-pressure refrigerant from the compressor 101 is bypassed. 110 directly flows into the evaporator 104F, and the evaporator 104F is defrosted (defrosted).
[0071]
【The invention's effect】
  As can be understood from the above description, according to the electric rotary flow path switching valve according to the present invention, when the flow path is switched, the pilot valve body is prior to the rotational displacement of the main valve body.Hourglass partOpens the pilot port, the pilot chamber communicates with the secondary valve port, the pilot chamber becomes a secondary side pressure lower than the primary side pressure, and there is a pressure difference at both ends of the main valve body. bodyTongue pieceThe force in the direction away from the fixed side member acts on the main valve body,TongueThe load that presses the valve seat is reduced, and the subsequent rotational displacement for switching the flow path of the main valve body is performed with low resistance. In addition, there is no inconvenience, no loud noise is generated during the switching operation, and it is excellent in silence and stable operation and durability can be ensured.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view showing one embodiment of an electric rotary flow path switching valve according to the present invention.
FIG. 2 is an exploded perspective view of a main part showing one embodiment of an electric rotary flow path switching valve according to the present invention.
3A to 3C are a plan sectional view showing an operating state of the electric rotary flow path switching valve shown in FIG. 1 and a table showing opening and closing of each port.
4A to 4C are a plan sectional view showing an operating state of the electric rotary flow path switching valve of FIG. 1 and a table diagram showing opening and closing of each port.
FIG. 5 is a refrigerant circuit diagram showing one embodiment of a refrigeration cycle apparatus for a refrigeration / refrigerator according to the present invention.
FIG. 6 is a refrigerant circuit diagram showing another embodiment of a refrigeration cycle apparatus for a refrigeration / refrigerator according to the present invention.
[Explanation of symbols]
10 Electric rotary flow path switching valve
11 Bottom cover member
12 cases
13 Valve chamber / rotor chamber
13A Primary side room
13B Pilot room
14 A port (primary port)
15, 16 Secondary connection port
20 Base plate
25 Valve seat plate
26 B port (first secondary port)
27 C port (secondary secondary port)
30 Main disc
32 Tongue piece
33 Inner Shell
35 Fitting gap
36 Pilot port
37 Pilot valve
38 Compression coil spring
50 Stepping motor
51 rotor
55 Stator assembly
101 Compressor
102 Condenser
103, 103F, 103R capillary tube
104, 104F, 104R Evaporator
109, 110 Bypass refrigerant passage

Claims (2)

Which has a valve seat surface, and the fixed-side member and one primary ports connected to the flow paths and two secondary side connecting port is formed,
A case that is airtightly mounted on the fixed side member, and forms a valve chamber / rotor chamber of an airtight chamber structure on the inner side in cooperation with the fixed side member;
Hermetically attached to the fixed member in the valve chamber, the rotor chamber, said valve chamber-the rotor chamber, wherein the primary chamber of the stationary member side, the opposite side of the pilot chamber and the secondary Divisions Mr. thereof A partition member having a cylindrical portion protruding toward the pilot chamber at the center ;
A cylindrical portion that is received by the cylindrical portion and supported so as to be rotatable and movable in the axial direction; a tongue piece portion that protrudes laterally at one end side of the cylindrical portion in the primary side chamber; and wherein adjacent tongue and a pilot port which is provided, wherein the two secondary-side connection port in the tongue portion by rotating about the central axis of the cylindrical portion penetrating in the axial direction A main valve body that opens and closes in a reciprocal relationship to switch the flow path,
Said main valve is rotatably disposed on the body concentrically to the other end of the cylindrical portion that protrudes in the pilot chamber side from the cylindrical portion, drum for opening and closing the pilot port in sliding contact with the end surface of the other end A pilot valve body having a shape ,
An urging means for applying an urging force for pressing the hourglass portion against the end surface on the other end side and pressing the tongue piece portion against the valve seat surface ;
Given the gap between the outer peripheral surface of the cylindrical portion and the inner peripheral surface of the cylindrical portion, the pilot chamber and the primary side chamber are connected to each other in a state where the pilot port is closed by the hourglass portion. An always-squeezed throttle passage that makes the pressure,
A stepping motor having a stator coil positioned and fixed to an outer peripheral portion of the case, and a rotor rotatably provided in the pilot chamber ;
The rotor has a cylindrical plastic magnet whose outer peripheral portion is magnetized, a central shaft that is insert-molded in the boss portion of the plastic magnet, and a circumferential portion of the inner peripheral surface of the plastic magnet. An integrally formed key-shaped valve drive protrusion, and is rotatably supported on the ceiling of the case at one end of the central shaft and of the central shaft passing through the central hole of the pilot valve body are bearings provided in the center hole of the cylindrical portion at the other end portion,
The pilot port is communicated with the pilot chamber at one, communicating with the secondary side connection ports 閉選-option in accordance with the rotational position of the main valve body on the other hand,
The main valve body is configured so that the drive protrusion contacts the engagement end surface of a substantially semicircular notch formed on the side of the cylindrical portion opposite to the side on which the tongue piece is projected. Is rotationally displaced to a specified rotational position that is connected to be capable of relative rotational displacement only in a predetermined rotational angle in the forward and reverse rotational directions and establishes channel switching,
The pilot valve body is always connected so as to rotate integrally with the rotor by engagement of the valve drive projection with a key groove formed in the pilot valve body, and the main valve body is positioned at the specified rotational position. The drum portion closes the pilot port at the rotor rotation angle position, and opens the pilot port prior to the rotational displacement of the main valve body,
An electrically-driven rotary flow path switching valve. In a refrigeration cycle apparatus for a refrigeration / refrigerator including a compressor, a condenser, a flow rate adjusting means, an evaporator, and a refrigerant passage connecting them,
Has an electric rotary channel selector valve of claim 1 Symbol placement, the primary port of the electric rotary channel selector valve is connected to a discharge port of said compressor, said two secondary side connection port one is connected to the condenser, the other refrigeration cycle device for freezers and refrigerators, characterized in that it is connected directly to the evaporator by a bypass refrigerant passage to bypass the condenser.

Images