JPS623347B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigeration cycle valve device used, for example, in piping connections of a split type air conditioner.

Generally, a split type air conditioner has a compressor, an outdoor heat exchanger, etc. disposed inside its outdoor unit, and these compressor and outdoor heat exchanger are communicated through a refrigerant pipe. One end of the refrigerant pipe is equipped with a low-pressure side valve device, and the other end is equipped with a high-pressure side valve device, and an indoor heat exchanger in the indoor unit is connected to each of these valve devices via connection piping. There is.

Therefore, when installing, shipping, or relocating an air conditioner, the connecting pipes are connected to and removed from the low-pressure side and high-pressure side valve devices, but when removing the connecting pipes, make sure that the refrigerant does not leak outside. It is necessary to close the valve device beforehand, and open the valve device after connecting the connecting piping.

However, since the conventional low-pressure side valve device has a valve stem 3 inserted into the flow path 2 of the valve body 1 as shown in Fig. 1, the cap must be attached and detached each time the valve is opened and closed. The valve stem had to be operated manually, making opening and closing the valve extremely troublesome.

Further, since a cap 4, a bush 5, an O-ring 6, etc. are required, the structure is complicated and the cost is high.

The present invention has been made focusing on the above circumstances,
The purpose is to provide a refrigeration cycle valve device that has a simple structure using fluid pressure and can automatically open and close a flow path in a valve body.

Hereinafter, one embodiment of the present invention will be described based on FIGS. 2 to 6. In the figure, 11 is an indoor unit, and an indoor heat exchanger 12 is provided inside this indoor unit 11. Further, 13 is an outdoor unit, and inside this outdoor unit 13, a compressor 14 and an outdoor heat exchanger 15 are arranged. The compressor 14 and the outdoor heat exchanger 15 are communicated via a refrigerant pipe 16. Further, the indoor heat exchanger 12 is connected to both ends of the refrigerant pipe 16 via low-pressure side and high-pressure side valve devices 17, 18 and connecting pipes 19, 20, thereby forming a refrigeration cycle.

Next, the valve device 17 of the present invention provided on the low pressure side of the refrigeration cycle will be described in detail.
7 is constructed as shown in FIG. That is, 21 is a valve body bent into an L shape, and an outlet 22 is provided at one end of the valve body 21 and an inlet 23 is provided at the other end.
A flow path 24 is provided which communicates the two. One end of the connection pipe 19 is detachably connected to the inlet 23, one end of the refrigerant pipe 16 is connected to the outlet 22, and the refrigerant pipe 1
6 is fixed to the peripheral edge of the outlet 22 by brazing material 16a. Further, a valve seat 25 is provided in the middle of the flow path 24 . A ball valve 26 is movably provided between the valve seat 25 and the insertion end of the refrigerant pipe 16. Also,
A stopper guide body 27 is disposed behind the ball valve 26 along the flow direction of the flow path 24.
As shown in FIGS. 4 to 6, the stopper guide body 27 includes a circular stopper portion 28 and three guide portions 29 protruding from the periphery of the stopper portion 28 at predetermined intervals. It is composed of: A spherical surface portion 30 is formed on the stopper portion 28, and a portion of the ball valve 26 is fitted into this spherical surface portion 30. With this fitting,
This prevents the ball valve 26 from vibrating and producing abnormal noise when the refrigerant gas flows in a predetermined direction. Furthermore, a through hole 31 is bored approximately at the center of the spherical portion 30 .

On the other hand, one of the guide parts 29... is the third
As shown in the figure, it is located at the center of the inner bottom of the valve body 21. The guide portions 29 have an inclined portion 32 formed at an angle of θ, and a straight portion 3 having a dimension of a from the middle to the base end.
3 is formed, and when the refrigerant gas flows in a predetermined direction, the refrigerant gas flowing out from the through hole 31 causes the valve seat 25 to
The guide part 29 displaces the ball valve 26, which is moving away from the center, toward the center as it moves toward the stopper part 28.
While being pressed against the inner surface of..., it can be guided to the spherical part 30 of the stopper part 28.
In other words, the ball valve 26 moving away from the valve seat 25 can be moved in a stable state and stopped at the spherical portion 30. In addition, the distance b from the stopper portion 28 to the center position of the ball valve 26 when stopped is set to be larger than the dimension a (the center position b is located on the inclined portion 32). The center position in the vertical direction is Δ upward with respect to the center position of the valve seat 25.
It is eccentric by an amount H, and as the flow of refrigerant gas stops, the ball valve 26 on the spherical part 30 can roll on the inclined part 32 by its own weight.

On the other hand, a valley portion 34 having an opening larger than the diameter D of the ball valve 26 and having a substantially V-shaped cross section is formed at the boundary between the inclined surface of the valve seat 25 and the inclined portion 32 of the guide portion 29. Therefore, when the flow of refrigerant gas is stopped, the ball valve 26 rolling on the inclined portion 32 can be stopped at the substantially V-shaped valley portion 34 before seating on the valve seat 25. Therefore, when the refrigerant flow stops, the ball valve 26 stops at the valley 34, and then the connecting pipe 19 is removed to separate the refrigeration cycle, thereby reducing the gap t between the valve seat 25 and the ball valve 26.
The ball valve 26 is pushed out by the fluid pressure of the refrigerant flowing through the valve device 17 so that the valve device 17 can be closed.

On the other hand, the high pressure side valve device 18 is the same as the conventional one. And the valve device 18
One end of the refrigerant pipe 16 is connected to the inlet of the refrigerant, and one end of the connection pipe 20 is removably connected to the outlet of the refrigerant.

Note that a capillary tube 41 (pressure reducing device) is provided inside the indoor unit 11, and this capillary tube 41 and the indoor heat exchanger 1 are connected to each other.
2 through a refrigerant pipe 42. The connecting pipe 1 is connected to both ends of the refrigerant pipe 42.
One ends of the valves 9 and 20 are detachably connected via valves 43 and 44.

Next, a method for installing the above-mentioned split type air conditioner will be explained. First, the indoor and outdoor units 11, 13 are installed at predetermined locations, and then one ends of the connecting pipes 19, 20 are connected to the valves 43, 44 of the indoor unit 11. Next, the other ends of the connecting pipes 19 and 20 are connected to the inlet 23 of the low pressure side valve device 17 of the outdoor unit 13, and the other end of the connecting pipe 20 is connected to the high pressure side valve device 18 of the outdoor unit 13. Connect to the outlet. After this connection is made, the valve stem of the high-pressure side valve device 18 is operated to open it.

When the compressor 14 is operated, high-pressure refrigerant gas is discharged from the compressor 14 and sent to the outdoor heat exchanger 15, where it is heat-radiated and condensed. 20 to the capillary tube 41, where it is depressurized.
After the refrigerant is evaporated in the indoor heat exchanger 12 , it flows out into the connecting pipe 19 and is sucked into the compressor 14 via the valve device 17 .

Here, when refrigerant gas flows into the passage 24 from the inflow port 23 of the low-pressure side valve device 17, the ball valve 26 is pressed and rolled by the flow pressure, and the valve seat 25
The flow path 24 is opened by moving away from the flow path 24. At this time, the ball valve 26 is moved to the guide portion 29 as shown in FIG.
The ball moves along the inclined portion 32 of the stopper portion 28 and is attracted to the spherical portion 30 of the stopper portion 28. Then, due to the fluid pressure of the refrigerant flowing through the through hole 31, the ball valve 26 rapidly engages with the spherical portion 30 and is stopped. Thus, the refrigerant gas flows along the flow path 24 in the valve body 21 and is flowed from the outlet 22 to the refrigerant pipe 16. Here, when the flow passage 24 is opened, the refrigerant gas flowing into the through hole 31 rapidly presses the ball valve 26 against the inner surface of the guide portion 29 and moves it toward the stopper portion 28. It will move in a stable state and will not dance. Therefore, it is possible to reduce noise.

Further, when the compressor 14 is stopped, the flow of refrigerant gas flowing through the flow path 24 is stopped, so the ball valve 26 rolls along the slope of the slope portion 32 due to its own weight. The ball valve 26 then stops at a substantially V-shaped trough 34. At this time, the refrigerant on the discharge side of the compressor 14 flows to the suction side of the compressor 14 through the gap t formed between the valve seat 25 and the ball valve 26. As a result, the discharge pressure and suction pressure of the refrigeration cycle are balanced, and the refrigeration cycle is prepared for restart.

When relocating and shipping such an air conditioner, first operate the valve stem of the high-pressure side valve device 18 to close the flow path, and then operate the compressor 14 for a predetermined period of time (several tens of seconds). . As a result, the refrigerant on the indoor unit 11 side is recovered to the outdoor unit 15 side through the open flow path 24. Thereafter, the valve devices 17, 18 and the valves 43, 44 of the indoor unit 11 are connected to the connecting pipes 19, 20.
By taking out the respective units, the indoor and outdoor units 11 and 13 are separated.

Here, in the low-pressure side valve device 17, as the operation is stopped for recovery, the ball valve 26 rolls and stops at the trough 34, similar to when the refrigeration cycle operation stopped earlier. do. Then, as the next connection pipe 19 is removed, the valve seat 25 and the ball valve 26 are removed.
The flow pressure of the refrigerant flowing out from the gap t between the trough 34
The upper ball valve 26 is pushed out toward the valve seat 25 and the valve seat 2
Close 5. This prevents refrigerant from flowing out.

Therefore, there is no need to manually operate the valve stem to open and close the valve device 17, and workability can be improved. Moreover, the valve device 17 using such a ball valve 26 can be simplified in structure since it does not require a cap, a bush, an O-ring, etc.

As explained above, according to the present invention, by connecting the valve body to the connecting pipe and operating the compressor, the flow pressure of the flowing refrigerant can roll the ball valve to the stopper part and open the flow passage. In addition, by stopping the operation and removing the connecting pipe from the valve body, the flow pressure of the refrigerant flowing out from the gap between the ball valve and the valve seat can push the ball valve that is stopped in the valley toward the valve seat, closing the flow path. It becomes like this.

As a result, when connecting and disconnecting the connecting piping to the valve body, the valve device can be opened and closed automatically without having to take the trouble of attaching and detaching the cap each time and manually operating the valve stem. It is possible to improve the Also, cap, button, O
Since no ring or the like is required, the structure can be simplified and costs can be reduced. Moreover, when the flow passage opens, the flow pressure of the refrigerant entering the through hole rapidly pushes the ball valve against the guide part and moves it to the stopper part, so the ball valve can be moved while maintaining a stable posture. There will be no dancing.

Furthermore, as the refrigerant stops flowing, the ball valve stops in the valley formed at the boundary between the slope of the valve seat and the slope of the guide. The refrigerant on the discharge side flows through the gap, thereby balancing the discharge pressure and suction pressure of the refrigeration cycle and preparing for restart.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view showing a conventional valve device, FIGS. 2 to 6 show an embodiment of the present invention, and FIG. 2 is a schematic configuration diagram showing a split type air conditioner. 3 is a longitudinal sectional view showing the valve device, FIG. 4 is a sectional view showing the stopper guide body, FIG. 5 is a front view thereof, and FIG. 6 is a perspective view thereof. 12... Indoor heat exchanger, 14... Compressor, 15...
Outdoor heat exchanger, 21...valve body, 24...flow path,
25... Valve seat, 26... Ball valve, 27... Stopper guide body, 28... Stopper part, 29... Guide part, 32...
Inclined portion, 34... Valley portion, 41... Capillary tube (pressure reducing device).

Claims (1)

[Claims] 1 A refrigeration cycle formed by sequentially connecting a compressor, an outdoor heat exchanger, a pressure reducing device, and an indoor heat exchanger, and a refrigeration cycle that is installed on the low pressure side of this refrigeration cycle and forms a flow path inside, and the flow path A valve body configured with a valve seat provided in the middle, a ball valve that is movably provided in a flow path of the valve body and can be moved toward and away from the valve seat, and a stopper guide body provided with a stopper part for stopping a ball valve separated from a valve seat and a guide part for guiding a ball valve separated from the valve seat to the stopper part; a through hole provided in the stopper part; A sloped part formed on the guide part for rolling the ball valve from the stopper part toward the valve seat side, and a slope part formed at the boundary between the sloped surface of the valve seat and the sloped part of the guide part and larger than the diameter of the ball valve. A valve device for a refrigeration cycle, comprising a valley portion having an opening and having a substantially V-shaped cross section.