JP2001056060A - Two way valve for regulating coolant flow rate in heating and cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a two way valve for regulating coolant flow rate in a heating and cooling device capable of properly performing a flow control, making coolant flow as a straight flow by a pipe to pipe, improving a problem of lowering of heating and cooling efficiency in the two way valve, simplifying a structure of a two way main body part and reducing cost. SOLUTION: Opening surfaces of a coolant input pipe 11 and a coolant output pipe 12 are opposed each other, a rotating valve element 14 rotating with a fan-shaped rotation angle is interposed between the opposed opening surfaces, fan-shaped rotation is performed for the rotating valve element 14 in a direction orthogonally crossed with an axis passing the opening surfaces of both of the pipes 11, 12 and both of the pipes 11, 12 are arranged so as to switch either one of communication and interruption or either one of large area communication and small area communication.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inlet / outlet side of an indoor heat exchanger during heating and an inlet / outlet side of an outdoor heat exchanger (external or outdoor side of an indoor heat exchanger during cooling). The present invention relates to a two-way valve for adjusting the flow rate of refrigerant in a cooling / heating device arranged at the middle of an indoor heat exchanger during cooling.

[0002]

2. Description of the Related Art Japanese Patent Laying-Open No. 55-121363 shows a typical example of a two-way valve for adjusting the flow rate of a refrigerant in a cooling and heating apparatus of this type. This two-way valve is connected to a casing of an electromagnetic solenoid by a refrigerant input pipe. A refrigerant output pipe is disposed at right angles to the plunger of the electromagnetic solenoid in the casing to advance and retreat, and a valve hole communicating with one of the pipes arranged in the advance and retreat direction is blocked or communicated to control the input and output of the refrigerant. .

[0003] For example, during cooling, refrigerant is introduced into the casing from a refrigerant input pipe arranged on the side wall of the casing,
The refrigerant in the casing is caused to flow out to a refrigerant output pipe arranged on the bottom wall of the casing, and the outflow and the interruption are controlled by the plunger. The right angle deflection of the refrigerant is an unavoidable structure by using an electromagnetic solenoid.

[0004]

However, in the two-way valve for adjusting the refrigerant flow rate in the above-mentioned conventional cooling and heating apparatus,
Due to the pressure loss due to the refrigerant flow being deflected at right angles, there is a problem that the efficiency is reduced.In addition, the refrigerant is once introduced into the casing internal space from one pipe and the refrigerant in the casing is led out to the other pipe. Therefore, a pressure loss is similarly caused, which causes a decrease in cooling / heating efficiency.

In the above cited gazette, although it is simply illustrated for the sake of explanation, in order to actually execute this, various components are required in the two-way valve body, and the structure is complicated and complicated design specifications are required. Cost. This problem is the same in a stepping motor type two-way valve that has been put into practical use in recent years.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a two-way valve for adjusting the flow rate of a refrigerant in a cooling and heating apparatus in which the flow rate can be properly controlled while flowing the refrigerant in a linear flow in a pipe-to-pipe manner. I will provide a. Thereby, the problem of the decrease in the cooling / heating efficiency in the two-way valve portion is improved as much as possible.

Further, the structure of the two-way valve body is simplified,
Provided is a two-way valve for adjusting the flow rate of a refrigerant in a cooling and heating device capable of achieving cost reduction.

[0008] In short, the two-way valve for adjusting the refrigerant flow rate in the cooling and heating apparatus according to the present invention has the opening surfaces of the refrigerant input pipe and the refrigerant output pipe facing each other, and has a fan-shaped rotation angle between the opposing opening surfaces. Accordingly, a rotating valve body that rotates is interposed.

Then, the rotary valve body is sector-rotated in a direction orthogonal to an axis passing through the opening surfaces of the two pipes to open or close the two pipes, or to communicate either a large area or a small area. It has a structure arranged so that it can be switched.

The above-mentioned rotary valve element is formed as a fan-shaped plate-type valve element, and the plate-type valve element is interposed between a first valve seat and a second valve seat. The base is rotatably supported on the first valve seat or the second valve seat with a rotation axis parallel to the pipe axis to achieve the switching.

As another suitable example of the rotary valve element, the rotary valve element is formed by a cylindrical valve element that rotates about a rotation axis orthogonal to the pipe axes, and the switching is performed. .
Each of the rotary valve bodies rotates via a reduction gear driven by a motor.

The rotary valve has a large-diameter valve hole for allowing the refrigerant input pipe and the refrigerant output pipe to pass through the entirety, and a small-diameter valve hole for partially communicating the refrigerant output pipe. The structure is to be switched. The large-diameter valve hole secures the flow rate of the refrigerant during a normal cooling and heating operation, and the small-diameter valve hole allows a limited flow of the refrigerant to perform a dehumidifying operation or the like.

[0013]

FIG. 1 shows an embodiment of the present invention.
This will be described in detail with reference to FIGS.

FIG. 1 shows a heating cycle in a cooling and heating apparatus, and the arrangement and operation of a two-way valve for adjusting a refrigerant flow rate in the cooling and heating apparatus according to the present invention. FIG. 2 shows the cooling cycle and the operation of the two-way valve for adjusting the refrigerant flow rate in the cooling / heating device according to the present invention disposed at the above position.

First, the principle of the heating cycle will be described with reference to FIG. 1. The high-pressure refrigerant discharged from the compressor 1 is supplied to one end of the indoor heat exchanger A through the four-way valve 2, and the expansion valve 3 is supplied from the other end. The heat is supplied to one end of the outdoor heat exchanger B through the four-way valve 2 from the other end to the compressor 1 to form a heating cycle.

Next, the principle of the cooling cycle will be described with reference to FIG. 2. The high-pressure refrigerant discharged from the compressor 1 is supplied to one end of the outdoor heat exchanger B through the four-way valve 2, and the expansion valve 3 is supplied from the other end. Then, it is supplied to one end of the indoor heat exchanger A, and is sucked from the other end via the four-way valve 2 to the compressor 1 to constitute a cooling cycle.

The indoor heat exchanger A includes A1 and A2.
Similarly, as the outdoor heat exchanger B, there is a structure shown in B1 and B2.

The indoor heat exchanger A1 includes unit heat exchangers 4a, 4
b, 4c are connected in series by piping. The outdoor heat exchanger B1 has a structure in which unit heat exchangers 5a, 5b, and 5c are connected in series by piping.

The indoor heat exchanger A2 is a unit heat exchanger 4a,
4b and 4c are connected in parallel by piping. The outdoor heat exchanger B2 has a structure in which the unit heat exchangers 5a, 5b, and 5c are connected in parallel by piping.

In the indoor heat exchanger A1 in the air conditioner according to the present invention, the two-way valve 10-1 for adjusting the refrigerant flow rate is provided.
Is installed in the series piping section 6 between the unit heat exchangers 4a, 4b, 4c.

In the indoor heat exchanger A2, the two-way valves 10-2 and 10-3 for adjusting the refrigerant flow rate are connected to the parallel pipe sections 7a (or 9) on the inlet side of the unit heat exchangers 4a, 4b and 4c.
a) or the outlet side parallel piping section 9a (or 7a).

In the outdoor heat exchanger B2, the two-way valves 10-4 and 10-5 for adjusting the refrigerant flow rate are connected to the inlet side parallel pipe portions 7b (or 9) of the unit heat exchangers 5a, 5b and 5c.
b) or the outlet side parallel piping section 9b (or 7b).

In the heating cycle, the two-way valve 10-1 of the indoor heat exchanger A1 is fully opened, and does not have a function as a two-way valve.
Numeral 1 has a function of restricting or completely communicating the refrigerant in the cooling cycle (having no shutoff function).

On the other hand, in both the heating cycle and the cooling cycle, the inlet side or outlet side parallel pipe sections 7a, 9a of the indoor heat exchanger A2 and the inlet side or outlet side parallel pipe sections 7b, 9b of the outdoor heat exchanger B2 are connected. Arranged two-way valve 10-2
10-5 are switched to one of predetermined communication and cutoff or one of large-area communication and small-area communication (throttle function) to perform a function as a two-way valve for efficiently controlling the function of the heat exchanger. Fulfill.

In the present invention, the two-way valves 10-1 to 10-5 are selectively used.

Hereinafter, a specific structural example of the two-way valves 10-1 to 10-5 for adjusting the flow rate of the refrigerant in the cooling and heating apparatus will be described with reference to FIGS.

The refrigerant flow adjusting two-way valve 10 includes a rotary valve body 14 provided between the refrigerant input pipe 11 and the refrigerant output pipe 12 and rotated at a fixed fulcrum with a fan-shaped rotation angle.

The rotary valve element 14 is constituted by a rotary valve element 14 formed of, for example, a fan-shaped plate-shaped valve element which is sector-rotated by a fixed stroke (constant sector-shaped rotation angle). Is rotatably supported on a shaft 20. Hereinafter, the rotary valve element 14 will be described as a sector-shaped rotary valve element 14.

The fan-shaped rotary valve body 14 is provided with a valve hole 15 through which the refrigerant discharged from the outlet side opening of the refrigerant input pipe 11 flows, and the rotary angle of the fan-shaped rotary valve body 14 is controlled. A configuration in which the communication area between the valve hole 15 and the openings of the refrigerant input / output pipes 11 and 12 is adjusted, and the flow rate of the refrigerant flowing into or out of the indoor heat exchanger A1 or A2 or the outdoor heat exchanger B2 is adjusted. And

The fan-shaped rotary valve element 14 is connected to the refrigerant input pipe 1.
1 between the outlet end face of the outlet and the inlet end face of the refrigerant output pipe 12.

As shown in FIG. 3, the fan-shaped rotary valve element 14
Uses a motor 16 as a drive source, transmits the rotational driving force of a rotating shaft 17 of the motor 16 to a sector-shaped rotary valve body 14 via a reduction gear mechanism 18, and rotates the sector-shaped rotary valve body 14 at a reduced speed.

The output gear 19 that rotates about the shaft 22 of the reduction gear mechanism 18 meshes with a fan rack 21 provided at the end of the fan-shaped rotary valve element 14 that rotates in a fan shape about the shaft 20, and By controlling the forward / reverse rotation direction and the forward / reverse rotation amount of the fan gear 16, the forward / reverse rotation direction and forward / reverse rotation angle of the output gear 19 and the sector rack 21 are controlled.
4 to adjust the area of communication between the refrigerant flow valve hole 15 and the openings of the refrigerant input / output pipes 11 and 12, thereby controlling the indoor heat exchanger A1 or The configuration is such that the flow rate of the refrigerant supplied to A2 or the outdoor heat exchanger B2 is adjusted.

As described above, the fan-shaped rotary valve element 14 is connected to the outlet-side opening end face of the refrigerant input pipe 11 and the refrigerant output pipe 12.
Interposed between the end face of the opening on the inlet side.

More specifically, as shown in FIG. 3, the end opening surface of the refrigerant input pipe 11 and the end opening surface of the refrigerant output pipe 12 are opposed to each other on the same axis in the casing 23, and The provided fan-shaped rotary valve element 14 is interposed between the open end faces of the pipes 11 and 12 and is installed so as to be fan-shaped rotatable in a direction orthogonal to the axis.

For example, as shown in FIGS. 3 to 5, the casing main body 24 is formed into a cup shape formed by integral press molding or integral synthetic resin molding, and a first valve seat made of a plate material is formed in an opening of the cup-shaped casing main body 24. 25 and the second valve seat 26 are fitted in an airtight and parallel manner, and the fan-shaped rotary valve body 14 made of a plate material is interposed between the first valve seat 25 and the second valve seat 26;
The valve element 14 is disposed so as to be able to rotate in a sector shape in parallel with the first and second valve seats 25 and 26 while slidingly contacting the inner surfaces of the valve seats.

The fan-shaped rotary valve element 14 is rotatably supported by the shaft 20 on the first valve seat 25 or the second valve seat 26 so as to be fan-rotatable.

In FIG. 3, the reduction gear mechanism 18 is provided inside the casing 23, and the output shaft 2 of the gear mechanism 18 is provided.
2 is pivotally supported on the first valve seat 25 or the second valve seat 26, and an output gear 19 rotating about the output shaft 22 is interposed between the first valve seat 25 and the second valve seat 26, By engaging with a fan-shaped rack 21 provided at the end of the sector-shaped rotary valve body 14, motion is transmitted,
The sector-shaped rotary valve element 14 can be sector-rotated between the first and second valve seats 25 and 26.

On the other hand, in FIG.
Is penetrated from the top wall of the casing 23, that is, the bottom wall of the cup-shaped casing main body 24, and protrudes into the casing 23. The end of the pipe 11 is supported by the first valve seat 25, and the pipe 11 is Of the refrigerant output pipe 1 is concentrically communicated with a valve hole 27 provided in the first valve seat 25.
2 is supported by the second valve seat 26, and the end opening of the pipe 12 is communicated concentrically with the valve hole 28 provided in the second valve seat 26; Are concentrically connected, and these 15, 27, 28 and both pipes 1
The openings 1 and 12 are concentrically communicated with each other. In short,
The two pipes 11 and 12 are concentrically connected via a fan-shaped rotary valve element 14.

On the other hand, in FIG. 6, an upper opening and a lower opening of the cylindrical casing main body 24 are sealed by a top cover 34 and a bottom cover 35 to form an airtight casing 23, in which a first valve seat 25 is provided. And the second valve seat 26
And a fan-shaped rotary valve body 14 formed of a fan-shaped plate is interposed between the two valve seats 25 and 26, and the end of the refrigerant input pipe 11 is vertically attached to the top cover 34 by brazing or the like. The end opening of the pipe 11 is communicated concentrically with the valve hole 27 provided in the first valve seat 25, and the refrigerant output pipe 12 is further suspended from the bottom cover 35 by brazing or the like. The end opening is communicated concentrically with the valve hole 28 provided in the second valve seat 26, so that the valve hole 15 and the valve holes 27, 2 are provided at the time of full communication.
8 are concentrically communicated, and these 15, 27, 28 and the openings of both pipes 11, 12 are mutually concentrically communicated. In short, the two pipes 11 and 12 are concentrically connected via the fan-shaped rotary valve element 14.

In FIG. 6, an airtight gear case 36 is provided integrally with the top cover 34 of the casing 23,
The speed reduction mechanism 18 is built in the gear case 36, and the output shaft 22 that rotates integrally with the output gear extends on the axis of the output gear. Then, the base of the fan-shaped rotary valve element 14 is pivotally supported.

Accordingly, the output shaft 22 is rotated by the reduced rotational force of the output gear, and the rotation of the output gear causes the sector-shaped rotary valve element 14 to rotate by a predetermined angle without the intervention of the rack gears 19 and 21. .

In the present invention, the outlet and the inlet of the refrigerant are concentrically opposed to each other, and the flow rate of the refrigerant is adjusted by rotating the rotary valve 14 between the outlet and the inlet in a direction orthogonal to the coaxial core. It shows the thought that was made.

The motor 16 in FIG. 3 is mounted and supported on the top wall of the casing 23, that is, on the outer surface of the bottom wall of the cup-shaped casing main body 24.
Reference numeral 6 is attached to and supported by a top cover 34 'of a gear case 36, and connects the reduction gear mechanism 18 to a motor rotation shaft 17 parallel to the pipes 11 and 12. A permanent magnet 2 is provided between the reduction gear mechanism 18 and the rotating shaft 17 of the motor 16.
9 transmits the rotational driving force of the motor to the reduction gear mechanism 18 via the permanent magnet 29.

More specifically, a permanent magnet 29 is integrally attached to the rotating shaft 17 of the motor 16 while the reduction gear mechanism 18
A suction plate 30 made of a magnetic material provided on the input gear of
When the permanent magnet 29 is rotated by the drive of the motor 16, the suction plate 30 is rotated, and the rotation of the suction plate 30 rotates the reduction gear mechanism 18, and the output gear 19 in FIG. 3 or the output shaft 22 in FIG. Is rotated.

The forward / reverse rotation and forward / reverse rotation angle of the fan-shaped rotary valve body 14 are controlled by a detection signal from a temperature sensor or the like for detecting a cooling / heating temperature or a freezing temperature represented by a thermistor. Stoppers 31 and 32 are provided for accurately stopping the sector-shaped rotary valve element 14 in the rotary position.

The stoppers 31, 32 are formed by pins provided upright in the space between the first and second valve seats 25, 26.
The fan-shaped turning angle of the fan-shaped turning valve body 14 is determined by stoppers 31 and 32.
The maximum fan-shaped pivot angle between the pair of barrel pins is limited.

As shown in FIG. 4, when the fan-shaped rotary valve element 14 is in contact with one of the stoppers 32, the valve hole 15 and the valve holes 27 and 28 are placed in a partially connected state. That is, the communication waits at the minimum communication opening area.

Alternatively, the control method includes a control method of bringing the valve hole 15 and the valve holes 27 and 28 into a fully closed state without partially communicating with each other during the one-sided sector rotation shown in FIG.

That is, the rotary valve element 14 is connected to the two pipes 11,
The pipes 11 and 12 are arranged so as to be switched in a sector-wise manner in a direction orthogonal to an axis passing through the opening surface of the pipe 12 so as to switch between communication and blocking or between large-area communication and small-area communication.

On the other hand, as shown in FIG.
Is rotated by a fixed amount toward the stopper 31,
The communication area between the valve hole 15 and the valve holes 27 and 28 is increased, and the valve body 14 comes into contact with the stopper 31 so that the valve hole 1
5 and the valve holes 27 and 28 communicate with each other over the entire opening area.
That is, it is the maximum communication opening area.

By controlling the communication area, the flow rate of the refrigerant flowing into or out of the indoor heat exchanger A1 or A2 or the outdoor heat exchanger B2 is controlled. For example, motor 1
6 or the number of rotations of the motor 16 is detected by a sensor such as a Hall element, and the rotation angle of the rotation valve body 14 is controlled and set by these detection signals.

FIGS. 7A and 7B show another example of the sector-shaped rotary valve element 14. FIG. The rotary valve element 14 has a small-diameter valve hole 15 ′ partially communicating with a large-diameter valve hole 15 that allows the refrigerant input pipe 11 and the refrigerant output pipe 12 to fully communicate with each other on the rotation trajectory.
As shown in FIG. 7B, the large-diameter valve hole 15 and the refrigerant input / output pipe 1
As shown in FIG. 7A, the small-diameter valve hole 15 ′ is partially connected to the center of the refrigerant input / output pipes 11 and 12 by sector rotation to the other side, and the refrigerant flow rate is increased. Aperture control.

That is, the rotary valve element 14 is connected to the two pipes 11,
The two pipes 11 and 12 are switched to one of a large-area communication by a large-diameter valve hole 15 and a small-area communication by a small-diameter valve hole 15 ′ by rotating in a sector shape in a direction orthogonal to an axis passing through an opening surface of the pipe 12. Deploy.

Next, FIG. 8 shows a cylindrical valve element which rotates about a rotation axis orthogonal to the axes of the pipes 11 and 12, instead of the rotary valve element comprising the fan-shaped rotary plate. The valve train 14 is formed. As shown in FIGS. 9A and 9B, the cylindrical rotary valve element 14 is housed in a cylindrical hermetic housing 23, and the cylindrical housing 23 is a top that also serves as a bottom cover of the cylindrical case main body 24 and a gear case 36. Cover 3
4 and the bottom cover 35, and supports the cylindrical valve element 14 on the same axis as the output gear 19 of the reduction gear mechanism 18 so as to rotate integrally with the output gear 19.

The cylindrical valve element 14 has a large-diameter valve hole 15 and a small-diameter valve hole 15 'penetrating in the diameter direction. The large-diameter valve hole 15 and the small-diameter valve hole 15 'are arranged so as to be orthogonal to each other.

Therefore, as shown in FIG.
4 is rotated 90 degrees, so that the refrigerant input / output pipe 1
The end openings 1 and 12 and the large-diameter valve hole 15 communicate with each other on the same axis to form a state in which the refrigerant is completely passed.

As shown in FIG. 9B, when the cylindrical valve body 14 is further rotated 90 degrees from the state shown in FIG.
Is connected to the small-diameter valve hole 15 ′ to form a so-called partial communication state, in which a limited amount of refrigerant supplied from the refrigerant input pipe 11 is supplied to the refrigerant output pipe 12 through the small-diameter valve hole 15 ′. I do. The small-diameter valve hole 15 'has a so-called refrigerant throttling means and functions as a dehumidifying means.

The refrigerant flow rate between the unit heat exchangers 4b and 4c during cooling is controlled by the two-way refrigerant flow control valve 10-1 provided in the indoor heat exchanger A1 having the above configuration.

The refrigerant flow control two-way valves 10-2 and 10-3 provided in the indoor heat exchanger A2 and the refrigerant flow control two-way valves 10-4 and 10-5 provided in the outdoor heat exchanger B2 are provided. ,
It controls the flow rate of the refrigerant flowing into or out of the unit heat exchangers 4b, 4c, 5b, 5c during cooling and heating.

[0060]

According to the present invention, the refrigerant is piped to
Flow control can be performed properly while flowing in a straight line with pipes, improving the problem of lowering of cooling and heating efficiency in the two-way valve part, and further simplifying the structure of the two-way valve body to achieve cost reduction. A two-way valve for adjusting the refrigerant flow rate in the obtained cooling and heating device can be provided.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a heating cycle.

FIG. 2 is a block diagram illustrating a cooling cycle.

FIG. 3 is a vertical sectional view of a two-way valve for adjusting a refrigerant flow rate in the cooling and heating device.

FIG. 4 is a cross-sectional view showing a partial communication state of the two-way valve for adjusting a refrigerant flow rate.

FIG. 5 is a transverse cross-sectional view showing a full flow state of the two-way valve for adjusting a refrigerant flow rate.

FIG. 6 is a longitudinal sectional view showing another example of the two-way valve for adjusting the refrigerant flow rate.

FIG. 7 is a plan view showing another example of the fan-shaped rotary valve body in the two-way valve for adjusting the refrigerant flow rate, wherein A is a partially communicating state, and B is a full communicating state.

FIG. 8 is a longitudinal sectional view showing still another example of the two-way valve for adjusting the refrigerant flow rate.

FIG. 9A is a cross-sectional view showing a full-flow state of the fan-shaped rotary valve body in the two-way valve for adjusting a refrigerant flow rate, and FIG. 9B is a cross-sectional view showing a partial communication state.

[Explanation of symbols]

 A1, A2 Indoor heat exchanger B1, B2 Outdoor heat exchanger 1 Compressor 2 Four-way valve 3 Expansion valve 4a, 4b, 4c Unit heat exchanger 5a, 5b, 5c Unit heat exchanger 6 Series piping 7a, 7b Parallel piping Unit 9a, 9b Parallel piping unit 10 Two-way valve for adjusting refrigerant flow rate 11 Refrigerant input pipe 12 Refrigerant output pipe 14 Rotating valve element 15 Valve hole 16 Motor 17 Rotating shaft 18 Reduction gear mechanism 19 Output gear 20 Shaft 21 Fan rack 22 Output Shaft 23 Casing 24 Casing main body 25 First valve seat 26 Second valve seat 27, 28 Valve hole 29 Permanent magnet 30 Attraction plate 31, 32 Stopper 34, 34 'Top cover 35 Bottom cover 36 Gear case

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) F25B 41/06 F25B 41/06 U

Claims (5)

[Claims] An opening surface of a refrigerant input pipe and an opening surface of a refrigerant output pipe are opposed to each other, and a rotation valve body that rotates at a fan-shaped rotation angle is interposed between the opposed opening surfaces. The body is arranged so as to be sectorally rotated in a direction orthogonal to an axis passing through the opening surfaces of the two pipes and to switch the two pipes to one of communication and blocking or to one of large area communication and small area communication. A two-way valve for adjusting a refrigerant flow rate in a cooling and heating device. 2. The rotary valve body is formed of a fan-shaped plate-shaped valve body, and the plate-shaped valve body is interposed between a first valve seat and a second valve seat, and the base of the valve body is connected to the first valve. The two-way valve for adjusting a refrigerant flow rate in a cooling and heating device according to claim 1, wherein the seat or the second valve seat is rotatably supported by a rotation axis parallel to the pipe axis. 3. A refrigerant in a cooling and heating apparatus according to claim 1, wherein said rotary valve element is formed by a cylindrical valve element which rotates on a rotation axis orthogonal to said pipe axes. Two-way valve for flow adjustment. 4. A two-way valve for adjusting a refrigerant flow rate in a cooling and heating apparatus according to claim 1, wherein said rotary valve body is rotated via a reduction gear driven by a motor. . 5. The rotary valve body has a large-diameter valve hole for allowing the refrigerant input pipe and the refrigerant output pipe to pass through the entirety, and a small-diameter valve hole for partially communicating the refrigerant input pipe and the refrigerant output pipe. 4. A two-way valve for adjusting a refrigerant flow rate in a cooling and heating apparatus according to claim 1, wherein the two-way valve is arranged so as to be selectively switched.