JPH09144915A - Four-way valve for refrigerating cycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a four-way valve in which changeover operation is smoothed by changing over by rotation. SOLUTION: A rotor 4 rotated by a spindle 5 is arranged in a valve main body 1, a first duct opening 6 is opened to one valve plate of the valve main body 1, and also two duct openings 7, 8 are opened by being separated from the both sides of first duct opening 6 at specified angles, and also being positioned on the locus of a circumference centering around the spindle 5, and further an approximately U-shaped communicating passage which is communicated with the first duct opening 6 and also alternatively and airtightly communicated with either duct opening 7 or 8 every time the rotor 4 is rotated in normal and reverse directions at the specified angles, is formed to a rotor 4. The other duct opening and a second duct opening 10 opened inside the valve main body 1 are communicated with each other through an inner space in the valve main body 1 so that a refrigerant passage can be changed over by rotation driving means by which the rotor 4 is rotated in normal and reverse directions at predetermined angles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle, and more particularly to a four-way valve for a refrigeration cycle used for switching between cooling and heating of a heat pump type air conditioner.

[0002]

Demand for this type of four-way valve for a refrigeration cycle is rapidly increasing due to the heat pump of an air conditioner, and there is a demand for cost reduction and downsizing. Hereinafter, an example of a conventional four-way valve for a refrigeration cycle will be described with reference to the drawings. That is, FIG. 13 is a sectional view of a conventional four-way valve for a refrigeration cycle, in which 1 is a closed cylindrical valve body, and 31 and 32 are discharges connected in opposite directions on both sides of the peripheral surface of the valve body. Pipe and suction pipe, 33 and 34 are the suction pipe 3
The first and second connecting pipes 33 are indoor coils (not shown) provided on both sides of the second connecting pipe 33.
The second connection pipe 34 is connected to an outdoor coil (not shown).

The connecting pipes 31, 32, 33, 34 are opened in the valve body 1, respectively, and the open ends of the three connecting pipes 32, 33, 34 arranged in parallel face each other in the axial direction of the valve body 1. First, the seat 35 is fixed to the valve body 1. Reference numeral 36 is a sliding valve that slides axially on the surface of the seat 35 in the valve body 1,
The suction pipe 32 and the first connection pipe 33, or the recess 37 for selectively connecting the suction pipe 32 and the second connection pipe 34 are provided. Numerals 38 and 39 are piston bodies having small holes 40 and 41 which are carried and arranged by connecting plates 49 on both sides of the sliding valve 36. Numerals 42 and 43 are lids that close the openings at both ends of the valve body 1, and numerals 44 and 45 are openings in spaces 46 and 47 between these lids and pistons. The solenoid pilot valve 48 is energized to select the suction pipe 32. It is a bleeder pipe that introduces low-pressure gas by one-way switching communication.

The operation of the four-way valve for the refrigeration cycle configured as described above will be described. When the electromagnetic pilot valve 48 is energized, the space 4 is passed through the extraction tubes 44 and 45.
6 or the space 47 and the suction pipe 32 are selectively communicated with each other to lower the pressure in the space, and the pressure on the discharge side in the valve body 1 on the opposite side via the small holes 40, 41 of the piston bodies 38, 39. Of the sliding valve 36, which is connected to the piston bodies 38, 39 due to the pressure difference between the two spaces by introducing the high pressure into the sliding valve 36.
The high-pressure refrigerant introduced from the discharge pipe 31 to the second
To heat the room by using the indoor coil as a condenser to communicate with the connection pipe 34, or to communicate the high pressure refrigerant with the first connection pipe 33 to cool the room by using the outdoor coil as a condenser and the indoor coil as an evaporator. To do.

[0005]

However, in the above-mentioned configuration, the pilot valve is an indispensable product because of the pressure difference between high and low pressures which is converted by the operation of the electromagnetic pilot valve 48 and the valve is switched according to the pressure difference. In addition, the structure is complicated and the cost is very high. Further, since the pilot valve and the valve body 1 are connected by the bleed pipes 44, 45, there are many connection points, the assembly cost is high, and there is a risk of gas leakage, and the bleed pipes 44, 45 and the small holes 40, 41 are many. Therefore, there is a risk that foreign matter in the refrigerant circuit may block the passage and disable switching. Furthermore, since the valve operation is switched according to the pressure difference, it cannot be switched unless there is a pressure difference, that is, in an air conditioner, etc., and operation loss occurs at the switching timing.

The present invention has been made in order to solve the above problems, and a first object thereof is to obtain a four-way valve for a refrigerating cycle in which the switching operation is performed smoothly by performing the switching operation by rotation. Is. A second object is to provide a highly reliable four-way valve for a refrigeration cycle that has a simplified structure, improves assembling workability, reduces costs, and has good switching operability.

[0007]

A four-way valve for a refrigeration cycle according to a first aspect of the present invention is provided with a rotary body rotatably fitted in a valve body by a spindle, and a predetermined amount is provided from the spindle. The first conduit port is opened at a distance from the valve plate, and the first conduit port is centered and separated by a predetermined angle on both sides, and two conduction ports are opened on a circular locus about the spindle. ， Opening the second conduit port in the valve body that is separate from these conducting ports and the first conduit port,
A substantially U-shaped member that communicates with the rotary body and communicates with the first conduit port, and communicates selectively and airtightly with either one of the two conduction ports each time it rotates in the forward or reverse direction by a predetermined angle. A communication passage is formed so that the other communication port and the second conduit port are communicated with each other through the internal space of the main body, and the rotary body is rotated by a rotation drive means for rotating the rotary body in a forward and reverse directions by a predetermined angle, and the refrigerant passage is formed. It is configured to switch.

A four-way valve for a refrigerating cycle according to a second aspect of the present invention is provided with a first concentric with a spindle of a rotating body of a valve body.
The conduit port is opened in the valve plate, and two conducting ports are opened at a predetermined angle on the track of the circumference that is separated from the first conduit port by a prescribed distance, and the conducting port and the first conduit port are separated from each other. A second conduit port is opened in the valve body, the rotary body is communicated with the first conduit port, and one of the two conducting ports is alternately rotated by a predetermined angle in the forward or reverse direction. In addition, a substantially U-shaped communication passage that is airtightly communicated is formed, and the other communication port and the second conduit port are communicated with each other through the internal space of the main body, and the rotating body is rotated in the forward and reverse directions by a predetermined angle. It is configured so that it is rotated by the rotation drive means for switching the refrigerant passage.

Further, a four-way valve for a refrigeration cycle according to a third aspect of the present invention is firstly concentric with a spindle of a rotating body of a valve body.
The conduit port is opened in the valve plate, and two conduction ports are opened in the valve plate on the side opposite to the first conduit port at a predetermined angle on a circular locus spaced apart from the first conduit port by a predetermined distance. A second conduit port is opened in the valve body that is separated from the communication port and the first conduit port, and the rotor is communicated with the first conduit port in either one of the two communication ports at a predetermined angle in the forward and reverse directions. A crank-shaped communication path that communicates with each other in an airtight manner is formed alternately with each rotation, and the other communication port and the second conduit port are communicated with each other through the internal space of the main body. Is rotated by a rotation drive means for rotating the refrigerant in the forward and reverse directions by a predetermined angle to switch the refrigerant passage.

A four-way valve for a refrigeration cycle according to a fourth aspect of the present invention has a first guide port opening in a valve plate at a predetermined distance from a rotating body support shaft in a valve body, and an anti-first guide tube. The valve plate on the mouth side was separated from the support shaft by a predetermined distance, and two conduction ports were opened at a predetermined angle on a circular locus around the support shaft, and the conduction port and the first conduit port were separated from each other. A second conduit port is opened in the valve body, the rotary body is opened to the first conduit port side symmetrical to the two communication ports, and communicates with the first conduit port, and either of the two conduction ports An approximately Y-shaped communication passage that selectively and airtightly communicates is formed on one side each time it rotates in the forward or reverse direction by a predetermined angle, and the other communication port and the second conduit port are connected to the internal space of the main body. So as to communicate with each other and rotate the rotating body by a rotation drive means for rotating the rotating body in the forward and reverse directions by a predetermined angle to switch the refrigerant passage. Are those that you configured.

In the four-way valve for a refrigeration cycle according to the fifth aspect of the present invention, the first conduit port serves as a low pressure discharge port, the second conduit port serves as a high pressure suction port, and the inside of the valve body serves as a high pressure space region. Alternatively, the first conduit port is used as a high pressure inlet port, the second conduit port is used as a low pressure outlet port, and the inside of the valve body is used as a low pressure space region to switch the refrigerant passages.

Further, a four-way valve for a refrigerating cycle according to a sixth aspect of the present invention is one in which an eccentric shaft is integrally and protruded from a support shaft of a rotating body as a rotation driving means for switching the four-way valve, and the eccentric shaft axis center is provided. A plunger for operating the electromagnetic coil is provided so as to be movable in a direction orthogonal to the direction, and a bracket is provided integrally with the plunger. The eccentric shaft is clamped by a protrusion integrated with the bracket, and the electromagnetic coil is biased to attract the plunger. The eccentric shaft is pressed by the action of a return spring when the energization is interrupted, and the linear movement of the plunger is converted into a rotational motion so as to rotate the support shaft in the forward and reverse directions by a predetermined angle. is there.

[0013]

The operation of the four-way valve thus configured will be described. In the case where the inside of the valve body 1 is used as a high-pressure space area, the rotating body 4 is rotated by a predetermined angle (A °) by the rotation driving means 11 so that the opening of each of the communicating passages 9 of the rotating body forms the communication port 8 and the first opening. The connection port 7 is connected to the second conduit port 10 through the inner space of the valve body 1 by connecting to the conduit port 6. Therefore, the refrigerant gas becomes a cooling cycle circuit of the compressor → the second conduit port 10 → the conducting port 7 → the outdoor coil → the expansion valve → the indoor coil → the conducting port 8 → the first introducing port 6 → the compressor. Next, by rotating the rotating body 4 in the reverse direction by a predetermined angle (A °) by the rotation driving means 11, the first conduit port 6 and the communication port 7 are communicated with each other, and the second conduit port 10 and the communication port 8 are communicated with each other. It Therefore, the refrigerant gas becomes a heating cycle circuit of the compressor → the second guide port 10 → the conducting port 8 → the indoor coil → the expansion valve → the outdoor coil → the conducting port 7 → the first conduit port 6 → the compressor. The protruding bearing portion of the support shaft 5 of the valve main body 1 is hermetically sealed by a container for accommodating a rotary drive device described later or by another method.

As described above, the rotary body 4 is rotatable in the valve body 1 in the forward and reverse directions about the support shaft 5 as a fulcrum, and the first conduit port 6 and two conducting ports 7 and 8 on both sides thereof. And the second conduit port 10 is arranged in parallel with the valve plate of the valve body,
The valve body can be made smaller and the valve body can be made lighter by making the connecting pipes connected to the respective connection ports not abutting each other and making the connecting pipes the minimum size that allows the assembly work. . Further, by rotating the rotating body in the forward and reverse directions by a predetermined angle, the switching operation of the flow direction in each conduction port can be performed, and the switching force can be reduced.

Further, since there are few sealing points between the communication port and the communication port at the time of switching, it suffices to project the seal member 14 at the peripheral edge of the opening of the communication passage 9 of the rotating body 4, and to seal with a simple structure. You can Although the seal member 14 is formed integrally with the rotating body 4, as shown in FIG. 2, a cylindrical seal member 14 made of Teflon having an acute tip is inserted from the opening of the communication passage 9 and the inside thereof is inserted. A copper pipe 16 is press-fitted in one direction and the sealing member is fixed by caulking this copper pipe, further improving the sealing effect.

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. Embodiment 1 FIG. FIG. 1 shows a four-way valve for a refrigeration cycle which is an embodiment of the present invention. In the figure, 1 is a valve body formed of a substantially fan-shaped box body, and 2 and 3 are two front and back surfaces constituting this valve body. Valve plate, 4 is a rotating body that is rotatably fitted in the body of the valve body by a support shaft 5 by using a fan of the valve body as a fulcrum, 6 is a first conduit port opened in the valve plate 2, 7, Reference numeral 8 designates two conducting ports, which are spaced apart from each other by a predetermined distance (B) with the first conduit port as the center, and which are opened on a circular locus with the supporting shaft 5 as a fulcrum. It is provided with connecting pipes for connecting refrigerant pipes (not shown) of the refrigeration cycle, respectively.

Reference numeral 9 denotes a rotating body 4 corresponding to the first conduit port 6.
Is provided on one end face of the rotor so as to communicate with the first communication port and selectively communicate with either one of the two communication ports each time the rotating body rotates in the forward or reverse direction by a predetermined angle. It is a substantially U-shaped communication passage. The predetermined distance (B) between the first conduit port and the conduction port corresponds to the distance that the rotating body rotates by a predetermined angle (A °), and the distance is the distance between the adjacent conduction port and the connection pipe of the first conduction port. It is set to the minimum size that can be fixed without touching. Reference numeral 10 denotes a second conduit port opened to avoid the openings of the respective connection pipes of the valve plate 2, and communicates with the other conduction port of the conduction port through the internal space of the valve body 1. Reference numeral 11 denotes a rotation driving means connected to the support shaft so as to rotate the rotating body in the forward and reverse directions by a predetermined angle on the valve plate 3 side of the valve body.

Reference numerals 12 and 13 denote bearing portions for rotatably supporting the support shaft 5 in the valve body, and bearings 12 inside the valve plate 2 of the valve body.
Is formed by forming a recess in the valve plate, and the bearing 13 on the valve plate 3 side is formed so as to penetrate the valve plate 3 so as to project the support shaft 5. A seal portion 14 is integrally formed with a seal portion projecting from the peripheral edge portion of the opening of the communication passage 9 of the rotating body corresponding to the first conduit port 6. , 15 are protrusions for slidably supporting the rotating body 4 formed on the inner surface of the valve body 1 so as to maintain a predetermined gap on the surface of the valve plate 2. In addition, the bearing 1
When a ball bearing or the like is used in place of 2 and 13 for the purpose of further reducing sliding resistance, the protrusion 15 can be omitted. Can be up.

Further, in the above-mentioned embodiment, four connecting pipes for each conducting port are arranged side by side on the valve plate of the valve body.
By providing 0 on the valve plate 3 on the side opposite to the first communication port 6 of the valve body or on the side wall of the valve body 1, the valve body can be further miniaturized. Further, U shown in the above embodiment
Even if the groove-shaped communication passage 9 is formed in a groove shape to facilitate the processing, the same effect as described above is obtained.

Embodiment 2 5, parts that are the same as or correspond to those in the first embodiment are assigned the same reference numerals and explanations thereof are omitted. That is, the first communication port 6 is provided in the valve plate 2 concentric with the support shaft 5 of the rotating body 4, and the communication ports 7 and 8 are provided in the first communication port 7.
A U-shape which is opened at a predetermined angle (A °) apart on a circular locus with the communication port as a fulcrum and a predetermined distance (B) away from each other, and communicates with the first conduit port 6 and the communication port 7 or 8. Since the communication passage 9 is formed in the rotating body 4, the same action and effect as in the first embodiment can be obtained, and the width of the rotating body 4 can be narrowed, so that the valve body 1 can be further downsized. be able to.

Embodiment 3 In FIG. 7, parts that are the same as or correspond to those in the first embodiment are assigned the same reference numerals and description thereof is omitted. That is, the first conduction port 6 is provided on the valve plate 2 concentric with the support shaft 5 of the rotating body 4, and the conduction ports 7 and 8 are connected to the valve plate 3 on the side opposite to the first conduction port 6 of the valve body 1. A crank-shaped connection that opens with the mouth as a fulcrum and at a predetermined angle (A °) on a circular locus that is a predetermined distance (B) apart, and that communicates with the first conduction port 6 and the conduction port 7 or 8. Since the passage 9 is formed in the rotating body 4, it has the same effect as that of the first embodiment, and the connecting pipes such as the first conduit are provided in the valve plates 2 and 3 of the valve body, respectively. Since the fluid flows in the axial direction of 1, the flow path resistance is reduced.

Embodiment 4 In FIG. 9, parts that are the same as or correspond to those in the first embodiment are assigned the same reference numerals and explanations thereof are omitted. That is, the first conduit port 6 is connected to the support shaft 5 of the rotating body.
The valve plate 2 is provided at a predetermined distance (B) from the valve plate 2, and the valve plate 3 concentric with the first port is opened with the port 7, and the port 8 has the center of the port and the rotator as a fulcrum. The openings are formed on the track of the circumference at a predetermined angle (A °) apart.

Further, a communication passage 9 is formed in the rotating body 4 so as to connect the first conducting port 6 and the conducting port 7, and the opening of the communicating passage 9 and the center of the rotating body are fulcrum on the first conducting port 6 side. A Y-shaped communication passage 9 is formed so as to be opened at a predetermined angle (A °) on the circumference of the circle, and to be joined and communicated in the middle of the communication passage 9 from this opening. Then, it has the same effect as that of the first embodiment.
In the above embodiment, when the rotating body 4 is rotated in the forward and reverse directions by a predetermined angle (A °) to communicate with the communication passage 9 and either one of the communicating ports 7 or 8, the other communicating port is connected to the rotating body. If the flow path to the inside of the 4-valve body 1 is obstructed, it can be easily solved by notching a part of the rotating body 1 and providing the notch 17.

The case where the first conduit port is used as the low pressure discharge port and the second conduit port 10 is used as the high pressure suction port so that the space inside the valve body 1 is in the high pressure region has been described. Can be used as a low pressure region, the first conduit port 6 can be used as a high pressure suction port, and the second conduit port 10 can be used as a low pressure discharge port. That is, in the case of a small air conditioner, in order to further reduce the force pushing the rotating body 4 in the valve body 1, it is better to set the internal space of the valve body 1 to a high pressure region as in the former case.
It is advantageous in terms of cost. Further, in a large air conditioner, it is advantageous to set the internal space of the valve body 1 to a low pressure region.

In the small air conditioner, the diameter of the refrigerant pipe used in this type of air conditioner is, for example, 12 mm for the low-pressure side pipe, 8 mm for the high-pressure side pipe, and large. The air conditioner generally sets the low-pressure side pipe diameter to 16 mm and the high-pressure side pipe diameter to 12 mm. Therefore, by setting the diameter of the first conduit to 12 mm, it is possible to provide a refrigeration cycle four-way valve that can be shared by air conditioners of different sizes without changing the size of the valve body, and to reduce manufacturing costs. You can

Embodiment 6 FIG. The present invention relates to a rotation driving means 11 for rotating a rotor in forward and backward directions by a predetermined angle. In FIGS. 1 and 12, 20 is a solenoid of a drive source adjacent to the valve body, 21 is the spindle 5 axis center and a predetermined size. (C)
An eccentric shaft which is eccentrically formed integrally with the support shaft, and 22 is a plunger provided so as to be movable in a direction orthogonal to the eccentric shaft axis,
3 is an electromagnetic coil for attracting the plunger, 24 is a return spring for pressing the plunger 22, and 25 is a bracket with two projections provided so as to sandwich both sides of the eccentric shaft 21 of the axial center line of the plunger 22. The bracket 22 is attached to the plunger 26 and moves integrally with the plunger 22. Reference numeral 27 is a stopper projecting from one side of the eccentric shaft 21, and 28 is two stop portions provided so as to prevent the stopper from moving a predetermined angle.

In this structure, the support shaft 5 is rotated by a predetermined angle by controlling the energization of the electromagnetic coil 23. That is, when the electromagnetic coil 23 is not energized, the return spring 24
The eccentric shaft 21 is pushed by the protrusion 25 due to the spring pressure and moves toward the side opposite to the electromagnetic coil 23, and the support shaft 5 rotates.
At this time, the stopper 27 rotates in cooperation with the support shaft 5 and contacts the stop portion 28 to stop. Next, when the plunger 22 and the bracket 26 are attracted in the axial direction by energizing the electromagnetic coil 23, the eccentric shaft 21 in contact with the protrusion 25 is pushed and the support shaft 5 rotates to rotate a predetermined angle. The stopper 27 comes into contact with another stop portion 28 and stops.

As described above, the rotation driving means can convert the linear movement of the plunger into a rotation operation with a simple structure, and can easily rotate in the forward and reverse directions by a predetermined angle. Further, the eccentric shaft 21 integrated with the support shaft 5 protruding from one side of the valve body 1, the assembly parts of the plunger 22 and the bracket 26 are housed in the container 29,
By hermetically fixing the container to the valve plate 3 side of the valve body, the shaft seal device on the bearing 13 side of the support shaft becomes unnecessary. The electromagnetic coil 23 can be attached from the outside of the container 29.

In the above embodiment, the tip of the protrusion 25 is formed into an acute angle so as to be in point contact with the outer peripheral surface of the eccentric shaft 21 to facilitate movement, but the contact portion of the protrusion 25 may be formed into a spherical shape. Further, as shown in FIG. 12, by making the projection 25 into a ball shape and rotatably mounted on the bracket 26, the contact with the eccentric shaft becomes smoother and the movement is easy.

[0030]

[Brief description of the drawings]

FIG. 1 is a sectional view of a four-way valve for refrigeration cycle according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line DD of FIG.

3 is a cross-sectional view taken along the line EE of FIG.

FIG. 4 is a sectional view of a main part of FIG. 1 showing another embodiment of the present invention.

FIG. 5 is a sectional view of a four-way valve for a refrigeration cycle according to a second embodiment of the present invention, which corresponds to FIG.

6 is a cross-sectional view taken along the line FF of FIG.

FIG. 7 is a sectional view of a four-way valve for a refrigeration cycle according to a third embodiment of the present invention, which corresponds to FIG.

8 is a cross-sectional view taken along the line GG in FIG.

FIG. 9 is a sectional view of a four-way valve for a refrigeration cycle according to a fourth embodiment of the present invention, which corresponds to FIG.

10 is a cross-sectional view taken along line HH of FIG.

11 is a cross-sectional view taken along the line JJ of FIG.

FIG. 12 is an enlarged sectional view of an essential part showing another embodiment of FIG. 1 and an operation explanatory view for converting linear motion into rotary motion.

FIG. 13 is a cross-sectional view of a conventional four-way valve for refrigeration cycle.

[Explanation of symbols]

1 valve body, 2 valve plate, 3 valve plate, 4 rotating body, 5 support shaft, 6 1st conduit port, 7 conduction port, 8 conduction port, 9 communication passage, 10 2nd conduit port, 11 rotation drive means, 21 Eccentric shaft, 22 Plunger, 23 Electromagnetic coil, 24 Return spring, 25 Protrusion, 26 Bracket.

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[Procedure amendment]

[Submission date] October 28, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claim 2

[Correction method] Change

[Correction contents]

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Claim 4

[Correction method] Change

[Correction contents]

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] Claim 6

[Correction method] Change

[Correction contents]

6. The spindle of the rotating body is projected to one side of the valve body,
An eccentric shaft formed integrally with the support shaft and eccentric to a predetermined size and a plunger movable in a direction orthogonal to the eccentric shaft center are provided, and the main body is attracted to the side opposite to the eccentric shaft. Both sides of the eccentric shaft are clamped by the attached electromagnetic coil, a return spring for urging the plunger toward the eccentric shaft, and a projection provided on a bracket integral with the plunger, and the plunger is energized by energizing the electromagnetic coil. aspirated, or by interruption of energization pressed by the projections of the eccentric shaft by the action of the return spring, the claims 1 and so rotated by a predetermined angle in forward and reverse directions of the support shafts 4 refrigeration cycle four-way valve according .

[Procedure amendment]

[Submission date] October 28, 1996

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Change

[Correction contents]

FIG. ────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 28, 1996

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Detailed description of the invention

[Correction method] Change

[Correction contents]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration cycle, and more particularly to a four-way valve for a refrigeration cycle used for switching between cooling and heating of a heat pump type air conditioner.

[0002]

Demand for this type of four-way valve for a refrigeration cycle is rapidly increasing due to the heat pump of an air conditioner, and there is a demand for cost reduction and downsizing. Hereinafter, an example of a conventional four-way valve for a refrigeration cycle will be described with reference to the drawings. That is, FIG. 13 is a sectional view of a conventional four-way valve for a refrigeration cycle, in which 1 is a closed cylindrical valve body, and 31 and 32 are discharges connected in opposite directions on both sides of the peripheral surface of the valve body. Pipe and suction pipe, 33 and 34 are the suction pipe 3
The first and second connecting pipes 33 are indoor coils (not shown) provided on both sides of the second connecting pipe 33.
The second connection pipe 34 is connected to an outdoor coil (not shown).

The connecting pipes 31, 32, 33, 34 are opened in the valve body 1, respectively, and the open ends of the three connecting pipes 32, 33, 34 arranged in parallel face each other in the axial direction of the valve body 1. First, the seat 35 is fixed to the valve body 1. Reference numeral 36 is a sliding valve that slides axially on the surface of the seat 35 in the valve body 1,
It has a recess 37 for selectively connecting the suction pipe 32 and the first connection pipe 33 or the suction pipe 32 and the second connection pipe 34. Numerals 38 and 39 are piston bodies having small holes 40 and 41 connected and arranged by connecting plates 49 on both sides of the sliding valve 36. Numerals 42 and 43 are lids that close the openings at both ends of the valve body 1, and numerals 44 and 45 are openings in spaces 46 and 47 between these lids and pistons. The solenoid pilot valve 48 is energized to select the suction pipe 32. It is a bleeder pipe that introduces low-pressure gas by one-way switching communication.

The operation of the four-way valve for the refrigeration cycle configured as described above will be described. When the electromagnetic pilot valve 48 is energized, the space 4 is passed through the extraction tubes 44 and 45.
6 or the space 47 and the suction pipe 32 are selectively communicated with each other to lower the pressure in the space, and the pressure on the discharge side in the valve body 1 on the opposite side via the small holes 40, 41 of the piston bodies 38, 39. Of the sliding valve 36, which is connected to the piston bodies 38, 39 due to the pressure difference between the two spaces by introducing the high pressure into the sliding valve 36.
The high-pressure refrigerant introduced from the discharge pipe 31 to the second
To heat the room by using the indoor coil as a condenser to communicate with the connection pipe 34, or to communicate the high pressure refrigerant with the first connection pipe 33 to cool the room by using the outdoor coil as a condenser and the indoor coil as an evaporator. To do.

[0005]

However, in the above-mentioned configuration, the pilot valve is an indispensable product because of the pressure difference between high and low pressures which is converted by the operation of the electromagnetic pilot valve 48 and the valve is switched according to the pressure difference. In addition, the structure is complicated and the cost is very high. Further, since the pilot valve and the valve body 1 are connected by the bleed pipes 44, 45, there are many connection points, the assembly cost is high, and there is a risk of gas leakage, and the bleed pipes 44, 45 and the small holes 40, 41 are many. Therefore, there is a risk that foreign matter in the refrigerant circuit may block the passage and disable switching. Furthermore, since the valve operation is switched according to the pressure difference, it cannot be switched unless there is a pressure difference, that is, in an air conditioner, etc., and operation loss occurs at the switching timing.

The present invention has been made in order to solve the above problems, and a first object thereof is to obtain a four-way valve for a refrigerating cycle in which the switching operation is performed smoothly by performing the switching operation by rotation. Is. A second object is to provide a highly reliable four-way valve for a refrigeration cycle that has a simplified structure, improves assembling workability, reduces costs, and has good switching operability.

[0007]

A four-way valve for a refrigeration cycle according to a first aspect of the present invention is provided with a rotary body rotatably fitted in a valve body by a spindle, and a predetermined amount is provided from the spindle. The first conduit port is opened at a distance from the valve plate, and the first conduit port is centered and separated by a predetermined angle on both sides, and two conduction ports are opened on a circular locus about the spindle. ， Opening the second conduit port in the valve body that is separate from these conducting ports and the first conduit port,
A substantially U-shaped member that communicates with the rotary body and communicates with the first conduit port, and communicates selectively and airtightly with either one of the two conduction ports each time it rotates in the forward or reverse direction by a predetermined angle. A communication passage is formed so that the other communication port and the second conduit port are communicated with each other through the internal space of the main body, and the rotary body is rotated by a rotation drive means for rotating the rotary body in a forward and reverse directions by a predetermined angle, and the refrigerant passage is formed. It is configured to switch.

A four-way valve for a refrigerating cycle according to a second aspect of the present invention is provided with a first concentric with a spindle of a rotating body of a valve body.
The conduit port is opened in the valve plate, and two conducting ports are opened at a predetermined angle on the track of the circumference that is separated from the first conduit port by a prescribed distance, and the conducting port and the first conduit port are separated from each other. A second conduit port is opened in the valve body, the rotary body is communicated with the first conduit port, and one of the two conducting ports is alternately rotated by a predetermined angle in the forward or reverse direction. In addition, a substantially U-shaped communication passage that is airtightly communicated is formed, and the other communication port and the second conduit port are communicated with each other through the internal space of the main body, and the rotating body is rotated in the forward and reverse directions by a predetermined angle. It is configured so that it is rotated by the rotation drive means for switching the refrigerant passage.

Further, a four-way valve for a refrigeration cycle according to a third aspect of the present invention is firstly concentric with a spindle of a rotating body of a valve body.
The conduit port is opened in the valve plate, and two conduction ports are opened in the valve plate on the side opposite to the first conduit port at a predetermined angle on a circular locus spaced apart from the first conduit port by a predetermined distance. A second conduit port is opened in the valve body that is separated from the communication port and the first conduit port, and the rotor is communicated with the first conduit port in either one of the two communication ports at a predetermined angle in the forward and reverse directions. A crank-shaped communication path that communicates with each other in an airtight manner is formed alternately with each rotation, and the other communication port and the second conduit port are communicated with each other through the internal space of the main body. Is rotated by a rotation drive means for rotating the refrigerant in the forward and reverse directions by a predetermined angle to switch the refrigerant passage.

Further, a four-way valve for a refrigeration cycle according to a fourth aspect of the present invention has a first conduit port opened in the valve plate at a predetermined distance from a rotating body support shaft in the valve body, and an anti-first conduit port. A valve which is separated from the support shaft by a predetermined distance and is opened at a predetermined angle on a circular locus about the support shaft by a predetermined angle so that the communication port and the first conduit port are separated from each other. A second conduit port is opened in the body, and the first body is symmetrical to the two communication ports in the rotating body.
A substantially Y-shape that opens to the conduit port side and communicates with the first conduit port and communicates selectively and airtightly with either one of the two conducting ports by rotating in a forward or reverse direction by a predetermined angle. -Like communication passage is formed, the other communication port and the second conduit port are communicated with each other through the inner space of the main body, and the rotary body is rotated by a rotation drive means for rotating the rotary body by a predetermined angle, It is configured to switch passages.

In the four-way valve for a refrigeration cycle according to the fifth aspect of the present invention, the first conduit port serves as a low pressure discharge port, the second conduit port serves as a high pressure suction port, and the inside of the valve body serves as a high pressure space region. Alternatively, the first conduit port is used as a high pressure inlet port, the second conduit port is used as a low pressure outlet port, and the inside of the valve body is used as a low pressure space region to switch the refrigerant passages.

Further, a four-way valve for a refrigerating cycle according to a sixth aspect of the present invention is one in which an eccentric shaft is integrally and protruded from a support shaft of a rotating body as a rotation driving means for switching the four-way valve, and the eccentric shaft axis center is provided. A plunger for operating the electromagnetic coil is provided so as to be movable in a direction orthogonal to the direction, and a bracket is provided integrally with the plunger. The eccentric shaft is clamped by a protrusion integrated with the bracket, and the electromagnetic coil is biased to attract the plunger. The eccentric shaft is pressed by the action of a return spring when the energization is interrupted, and the linear movement of the plunger is converted into a rotational motion so as to rotate the support shaft in the forward and reverse directions by a predetermined angle. is there.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described in detail below with reference to the drawings. Embodiment 1 FIG. FIG. 1 shows a four-way valve for a refrigeration cycle according to an embodiment of the present invention. In the figure, 1 is a valve body formed of a substantially fan-shaped box, and 2 and 3 are two front and back surfaces constituting the valve body. Valve plate, 4 is a rotating body that is rotatably fitted in the body of the valve body by a support shaft 5 by using a fan of the valve body as a fulcrum, 6 is a first conduit port opened in the valve plate 2, 7, Reference numeral 8 denotes two conduction ports which are separated from each other by a predetermined distance with the first conduit port as a center, and which are opened on a circular locus with the support shaft 5 as a fulcrum. Connection pipes are provided to connect the refrigerant pipes (not shown).

Reference numeral 9 denotes a rotating body 4 corresponding to the first conduit port 6.
Provided in an opening in one end face, so that the rotational member to either one of the two conducting openings in communication with the first conductive tube opening communicates alternatively each time rotated a predetermined angle forward or reverse direction It is a generally U-shaped communication passage. The predetermined distance between the first conduit opening and conducting port rotation body corresponds to a predetermined angle (A °) Distance rotated, the distance connecting pipe conducting port and the first conductive tube opening is adjacent abutment It is set to the minimum size that can be fixed and fixed. Reference numeral 10 denotes a second conduit port opened to avoid the openings of the respective connection pipes of the valve plate 2, and communicates with the other conduction port of the conduction port through the internal space of the valve body 1. Reference numeral 11 denotes a rotation driving means connected to the support shaft so as to rotate the rotating body in the forward and reverse directions by a predetermined angle on the valve plate 3 side of the valve body.

Reference numerals 12 and 13 denote bearing portions for rotatably supporting the support shaft 5 in the valve body, and bearings 12 inside the valve plate 2 of the valve body.
Is formed by forming a recess in the valve plate, and the bearing 13 on the valve plate 3 side is formed so as to penetrate the valve plate 3 so as to project the support shaft 5. A seal portion 14 is integrally formed with a seal portion projecting from the peripheral edge portion of the opening of the communication passage 9 of the rotating body corresponding to the first conduit port 6. , 15 are protrusions for slidably supporting the rotating body 4 formed on the inner surface of the valve body 1 so as to maintain a predetermined gap on the surface of the valve plate 3 . In addition, the bearing 1
When a ball bearing or the like is used in place of 2 and 13 for the purpose of further reducing sliding resistance, the protrusion 15 can be omitted.

The operation of the four-way valve thus configured will be described. In the case where the inside of the valve body 1 is used as a high-pressure space area, the rotating body 4 is rotated by a predetermined angle (A °) by the rotation driving means 11 so that the opening of each of the communicating passages 9 of the rotating body forms the communication port 8 and the first opening. The connection port 7 is connected to the second conduit port 10 through the inner space of the valve body 1 by connecting to the conduit port 6. Therefore, the refrigerant gas becomes a cooling cycle circuit of the compressor → the second conduit port 10 → the conducting port 7 → the outdoor coil → the expansion valve → the indoor coil → the conducting port 8 → the first conduit port 6 → the compressor. Next, by rotating the rotating body 4 in the reverse direction by a predetermined angle (A °) by the rotation driving means 11, the first conduit port 6 and the communication port 7 are communicated with each other, and the second conduit port 10 and the communication port 8 are communicated with each other. It Therefore, the refrigerant gas goes from the compressor to the second conduit port 10 to the conducting port 8 to the indoor coil to the expansion valve to the outdoor coil to the conducting port 7 to the first conduit port 6 to the heating cycle circuit of the compressor. The protruding bearing portion of the support shaft 5 of the valve main body 1 is hermetically sealed by a container for accommodating a rotary drive device described later or by another method.

As described above, the rotary body 4 is rotatable in the valve body 1 in the forward and reverse directions about the support shaft 5 as a fulcrum, and the first conduit port 6 and two conducting ports 7 and 8 on both sides thereof. And the second conduit port 10 is arranged in parallel with the valve plate of the valve body,
The valve body can be made smaller and the valve body can be made lighter by making the connecting pipes connected to the respective connection ports not abutting each other and making the connecting pipes the minimum size that allows the assembly work. . Further, by rotating the rotating body in the forward and reverse directions by a predetermined angle, the switching operation of the flow direction in each conduction port can be performed, and the switching force can be reduced.

[0018] Moreover, since a small seal portions between the conductive port and the communication path at the time of switching, it is only necessary to project from the sealing member 14 in the opening portion of the communication passage 9 of the rotary body 4, be sealed with a simple structure You can Although the seal member 14 is formed integrally with the rotating body 4, as shown in FIG. 2, a cylindrical seal member 14 made of Teflon having an acute tip is inserted from the opening of the communication passage 9 and the inside thereof is inserted. The copper pipe 16 is press-fitted to one side and the sealing member is fixed by caulking the copper pipe, so that the sealing effect can be further improved.

Further, in the above-mentioned embodiment, four connecting pipes for each conducting port are arranged side by side on the valve plate of the valve body.
0 or provided in the valve plate 3 of the anti-first guide pipe port 6 side of the valve body, or by providing the side wall of the valve body 1 can be downsized further valve body. Further, U shown in the above embodiment
Even if the groove-shaped communication passage 9 is formed in a groove shape to facilitate the processing, the same effect as described above is obtained.

Embodiment 2 5, parts that are the same as or correspond to those in the first embodiment are assigned the same reference numerals and explanations thereof are omitted. That the first conduction port 7,8 provided with a first guide tube opening 6 to the support shaft 5 and concentric with the valve plate 2 of the rotating body 4 1
The guide tube opening as a fulcrum, and a predetermined distance (B) a predetermined angle apart circumferentially on the trajectory (A °) with spaced is opened, U-shaped communicating with the conduction port 7 or 8 and the first conduit opening 6 Since the communication passage 9 having the shape of a circle is formed in the rotating body 4, the same operation and effect as in the first embodiment can be obtained, and the width of the rotating body 4 can be narrowed, so that the valve body 1 can be further downsized. can do.

Embodiment 3 In FIG. 7, parts that are the same as or correspond to those in the first embodiment are assigned the same reference numerals and description thereof is omitted. That provided with a first guide tube opening 6 to the support shaft 5 and concentric with the valve plate 2 of the rotating member 4, the first conduction port 7,8 in the valve plate 3 of the anti-first guide pipe port 6 side of the valve body 1 as a fulcrum 1 guide tube opening, and a predetermined distance (B) a predetermined angle apart circumferentially on the trajectory (a °) with spaced is opened, communicates with the conduction port 7 or 8 and the first conductive tube opening 6 The crank-shaped communication passage 9 is formed in the rotating body 4, and has the same operation and effect as in the first embodiment, and the connecting pipes such as the first conduit port are provided in the valve plates 2 and 3 of the valve body, respectively. Since the fluid flows in the axial direction of the rotating body 4, the flow path resistance is reduced.

Embodiment 4 In FIG. 9, parts that are the same as or correspond to those in the first embodiment are assigned the same reference numerals and explanations thereof are omitted. That is, the first conduit port 6 is connected to the support shaft 5 of the rotating body.
From is provided on the valve plate 2 apart a predetermined distance (B), the conduction port 7 is opened to the first conductive tube opening concentric with the valve plate 3, the conduction port 8 and the fulcrum center of the rotating body and the conductive opening The holes are opened at a predetermined angle (A °) apart from each other on the circular trajectory.

[0023] center of said opening of the communication passage 9 to the first conductive tube opening 6 side with the rotary member 4 to form the communication passage 9 for communicating the conduction port 7 and the first conductive tube opening 6 rotator A Y-shaped communication passage 9 is formed so as to be opened at a predetermined angle (A °) on a circular locus with the fulcrum as a fulcrum, and to join and communicate with each other in the middle of the communication passage 9 from this opening. The third embodiment has the same effects as those of the first embodiment.
In the above embodiment, when the rotating body 4 is rotated in the forward and reverse directions by a predetermined angle (A °) to communicate with the communication passage 9 and either one of the communicating ports 7 or 8, the other communicating port is connected to the rotating body. If the flow path to the inside of the four-valve body 1 is obstructed, it can be easily solved by notching a part of the rotating body 4 and providing the notch 17.

The case where the first conduit port is used as the low pressure discharge port and the second conduit port 10 is used as the high pressure suction port so that the space inside the valve body 1 is in the high pressure region has been described. Can be used as a low pressure region, the first conduit port 6 can be used as a high pressure suction port, and the second conduit port 10 can be used as a low pressure discharge port. That is, in the case of a small air conditioner, in order to further reduce the force pushing the rotating body 4 in the valve body 1, it is better to set the internal space of the valve body 1 to a high pressure region as in the former case.
It is advantageous in terms of cost. Further, in a large air conditioner, it is advantageous to set the internal space of the valve body 1 to a low pressure region.

In the small air conditioner, the diameter of the refrigerant pipe used in this type of air conditioner is, for example, 12 mm for the low-pressure side pipe, 8 mm for the high-pressure side pipe, and large. The air conditioner generally sets the low-pressure side pipe diameter to 16 mm and the high-pressure side pipe diameter to 12 mm. Therefore, by setting the diameter of the first conduit to 12 mm, it is possible to provide a refrigeration cycle four-way valve that can be shared by air conditioners of different sizes without changing the size of the valve body, and to reduce manufacturing costs. You can

Embodiment 6 FIG. The present invention relates to a rotation driving means 11 for rotating a rotor in forward and backward directions by a predetermined angle. In FIGS. 1 and 12, 20 is a solenoid of a drive source adjacent to the valve body, 21 is the spindle 5 axis center and a predetermined size. (C)
An eccentric shaft which is eccentrically formed integrally with the support shaft, and 22 is a plunger provided so as to be movable in a direction orthogonal to the eccentric shaft axis,
3 is an electromagnetic coil for attracting the plunger, 24 is a return spring for pressing the plunger 22, and 25 is a bracket with two projections provided so as to sandwich both sides of the eccentric shaft 21 of the axial center line of the plunger 22. The bracket 22 is attached to the plunger 26 and moves integrally with the plunger 22. Reference numeral 27 is a stopper projecting from one side of the eccentric shaft 21, and 28 is two stop portions provided so as to prevent the stopper from moving a predetermined angle.

In this structure, the support shaft 5 is rotated by a predetermined angle by controlling the energization of the electromagnetic coil 23. That is, when the electromagnetic coil 23 is not energized, the return spring 24
The eccentric shaft 21 is pushed by the protrusion 25 due to the spring pressure and moves toward the side opposite to the electromagnetic coil 23, and the support shaft 5 rotates.
At this time, the stopper 27 rotates in cooperation with the support shaft 5 and contacts the stop portion 28 to stop. Next, when the plunger 22 and the bracket 26 are attracted in the axial direction by energizing the electromagnetic coil 23, the eccentric shaft 21 in contact with the protrusion 25 is pushed and the support shaft 5 rotates to rotate a predetermined angle. The stopper 27 comes into contact with another stop portion 28 and stops.

As described above, the rotation driving means can convert the linear movement of the plunger into a rotation operation with a simple structure, and can easily rotate in the forward and reverse directions by a predetermined angle. Further, the eccentric shaft 21 integrated with the support shaft 5 protruding from one side of the valve body 1, the assembly parts of the plunger 22 and the bracket 26 are housed in the container 29,
By hermetically fixing the container to the valve plate 3 side of the valve body, the shaft seal device on the bearing 13 side of the support shaft becomes unnecessary. The electromagnetic coil 23 can be attached from the outside of the container 29.

In the above embodiment, the tip of the protrusion 25 is formed into an acute angle so as to be in point contact with the outer peripheral surface of the eccentric shaft 21 to facilitate movement, but the contact portion of the protrusion 25 may be formed into a spherical shape. Further, as shown in FIG. 12, by making the projection 25 into a ball shape and rotatably mounted on the bracket 26, the contact with the eccentric shaft becomes smoother and the movement is easy.

Claims (6)

[Claims] 1. A valve body, a rotating body rotatably fitted in the body by a support shaft, and a first conduit port opened in the valve plate of the valve body at a predetermined distance from the support shaft. , The first guide port is the center, the two sides are separated from each other by a predetermined angle, and the two ports are respectively opened on the locus of the circumference around the support shaft, and these are separated from these ports and the first conduit port. And a second conduit port opened in the valve body, and one end of the rotating body air-tightly communicates with the first conduit port to rotate in one of the two communicating ports in the forward and reverse directions by a predetermined angle. Alternatively, a substantially U-shaped communication passage communicating with each other in an airtight manner is provided, and the other of the two conduction ports and the second conduit port opening to the main body are connected to the space inside the main body. A refrigerating cycle equipped with a rotation drive means for communicating the rotor through one side and rotating the rotor in the forward and reverse directions by a predetermined angle. Use the four-way valve. 2. A valve main body, a rotating body rotatably fitted in the main body by a support shaft, a first conduit port opened concentrically with the support shaft in a valve plate of the valve main body, and a support. Opened in the valve body apart from the shaft and a predetermined distance from the shaft, and two communicating ports opened at a predetermined angle on the circular locus around the spindle. Each of the second conduit port and one end of the rotating body communicates with the conduit port in an airtight manner, and one of the two communication ports is rotated at a predetermined angle in the forward or reverse direction. A substantially U-shaped communication passage that airtightly communicates is provided, and the other of the two conduction ports and the second conduit port that opens to the main body communicate with each other through the space inside the main body, A four-way valve for a refrigerating cycle, comprising: a rotation driving means for rotating the rotor in a forward or reverse direction by a predetermined angle. 3. A valve main body, a rotating body rotatably fitted in the main body by a support shaft, a first conduit port opened concentrically with the support shaft of a valve plate of the valve main body, Two conduction ports, which are spaced apart from the support shaft by a predetermined distance and are spaced apart from each other by a predetermined angle on a circular locus around the support shaft, and which are respectively opened on the valve plate of the first conduit port, and these conduction ports and the first A second conduit port opened in the valve body apart from the conduit port and airtightly connected to the rotating body with the first conduit port to rotate in one of the two communication ports in a forward or reverse direction at a predetermined angle. In addition to providing a substantially crank-shaped communication passage that communicates in an airtight manner with each movement,
Rotation driving means for communicating the other of the individual communication ports with a second conduit port opening to the main body through a space inside the main body, and rotating the rotor on one side of the main body in forward and reverse directions by a predetermined angle. Four-way valve for refrigeration cycle equipped with. 4. A valve main body, a rotating body rotatably fitted in the main body by a support shaft, and a first conduit port opened at a predetermined distance from the support shaft of a valve plate of the valve main body. , Opened in the valve plate of the anti-first conduit port at a predetermined distance from the support shaft and at a predetermined angle on a circular locus around the support shaft.
Individual conducting ports, a second conduit port opened in the valve main body apart from these conducting ports and the first conduit port, and a spindle at a predetermined distance from the spindle on the first conducting port side of the rotor. A substantially Y-shaped communication passage that communicates with two openings that are opened at a predetermined angle apart from each other on a circular locus around the center and one of the communication ports is formed. Each of the two conduction ports is selectively and airtightly communicated with one of the two conduction ports by rotating in a forward or reverse direction by a predetermined angle. The other of the ports and the second conduit port opening to the main body are communicated with each other through the space inside the main body, and one side of the main body is provided with a rotation driving means for rotating the rotor in the forward and reverse directions by a predetermined angle. Four-way valve for refrigeration cycle. 5. The first conduit port is a low pressure discharge port or a high pressure suction port, the second conduit port is a high pressure suction port or a low pressure discharge port, and the inside of the valve body is in a high pressure region or a low pressure region. A four-way valve for a refrigeration cycle according to claim 1. 6. The spindle of the rotating body is projected to one side of the valve body,
An eccentric shaft formed integrally with the support shaft and eccentric to a predetermined size and a plunger movable in a direction orthogonal to the eccentric shaft center are provided, and the main body is attracted to the side opposite to the eccentric shaft. Both sides of the eccentric shaft are clamped by the attached electromagnetic coil, a return spring for urging the plunger toward the eccentric shaft, and a projection provided on a bracket integral with the plunger, and the plunger is energized by energizing the electromagnetic coil. 5. A four-way valve for a refrigeration cycle according to claim 1, wherein the eccentric shaft is pressed by a projection by a return spring by suction or interruption of energization, and the support shaft is rotated in a forward or reverse direction by a predetermined angle. .