JPH0414683Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a four-way valve that allows heating and cooling of a cooler to be easily switched.

Various four-way valves of this type have been devised in the past, such as Utility Model Publication No. 1502/1983, but all of them required electromagnetic coils to be excited during heating and cooling, resulting in energy loss.

The present invention was devised in view of the above points, and according to the present invention, the electromagnetic coil is deenergized during heating and cooling to eliminate wasteful energy consumption.

According to the present proposal, a first passage communicating with an outdoor unit such as a condenser, a second passage communicating with an indoor unit such as an evaporator, and a third passage communicating with an inlet side of a compressor are provided on one side, respectively. a cylinder which is arranged in parallel with each other and has a fourth passage on the other side facing each of these passages and communicating with the discharge side of the compressor; and a small hole which slides inside this cylinder and opens into the cylinder; A piston having an engaging portion on its periphery, a switching valve that selectively switches between the first, second and third passages in association with the piston, and a spring that constantly biases the piston in the direction of the switching valve. an electromagnetic coil provided outside the cylinder; a plunger actuated by the operation of the electromagnetic coil; and the plunger is closed when deenergized, with one end opening into the second passage and the other end opening into the plunger chamber. and a rod having one end fixed to the plunger and the other free end facing into the cylinder, the rod being adapted to selectively engage the engaging portion of the piston when the electromagnetic coil is de-energized. The purpose of the present invention is to provide a four-way valve which is capable of heating and cooling with the solenoid valve deenergized and is suitable for energy saving measures.

In other words, the present invention is a four-way valve that switches between heating and cooling when the electromagnetic coil is energized, and heating and cooling when the electromagnetic coil is deenergized, unlike conventional valves that energize the electromagnetic coil during heating and cooling. In contrast, it can be said to be suitable for energy consumption.

The present invention will be described below with reference to an embodiment shown in the drawings. The cylinder 1 has a first passage 3 communicating with an outdoor unit 2 such as a condenser, a second passage 5 communicating with an indoor unit 4 such as an evaporator, and a third passage communicating with the inlet side of a compressor 6. The passages 7 are arranged side by side, and the cylinder 1 of each passage is
A valve seat 8 is provided on the opening side. However, the upper surface 9 of the valve seat 8 is smooth. The cylinder 1 has a fourth passage 10 facing each of these passages, and this fourth passage is connected to the discharge side of the compressor 6.

11 is a pipe that connects the outdoor unit 2 and the first passage 3; 12 is a pipe that connects the indoor unit 4 and the second passage 5; and 13 is a pipe that connects the inlet side of the compressor 6 and the third passage 7. Pipe 14 indicates a pipe connecting the discharge side of the compressor 6 and the fourth passage 10, respectively.

A piston 15 is slidably provided within the cylinder 1, and is always biased to the right in the figure by a spring 16. A dome-shaped switching valve 18 is provided on the opposite side of the piston 15 from the spring via a connecting rod 17. This switching valve 18 slides on the upper surface 9 of the valve seat 8 and is configured to selectively switch each of the passages 3, 5, and 7 by means of a valve chamber 19.

20 is an electromagnetic coil provided on the cylinder 1, and 21 is its plunger. Reference numeral 22 denotes a pilot valve provided on the lower surface of the plunger 21, which closes the through hole 23 provided in the cylinder 1 when the electromagnetic coil is deenergized, that is, when the plunger is lowered in the figure. This through hole 23 is connected to the pilot circuit 2.
It communicates with the second passage 5 via 4.

A through hole 25 is provided on the spring 16 side of the cylinder 1,
A rod 26 provided on the lower surface of the plunger 21 is fitted.

27 is a spring that deflects the plunger 21 downward in the figure when the electromagnetic coil is deenergized.

The piston has a small hole 28 in the axial direction, which communicates the switching valve side and the spring side of the cylinder. Further, a groove 29 is provided on the periphery of the spring side of the piston 15 so that it can selectively engage with the rod 26.

Next, I will discuss the effect of this proposal.

When the electromagnetic coil 20 is in the deenergized state as shown in FIG.
2 closes the through hole 23, and the rod 26 protrudes from the through hole 25 into the cylinder.

In this state, the high-pressure, high-temperature refrigerant discharged from the discharge side of the compressor 6 is guided from the pipe 14 through the fourth passage 10 into the cylinder chamber on the right side of the piston 15 in the figure, and actually passes through the small hole 28 of the piston. It is introduced into the cylinder chamber on the left side of the piston, so the pressure in the left and right cylinder chambers of the piston is the same. Therefore, the piston 15 moves to the right in the figure due to the elasticity of the spring 16, and the switching valve 18 also moves to the right via the connecting rod 17. Due to this movement of the switching valve 18, the valve chamber 19 communicates the second passage 5 and the third passage 7,
A first passageway is opened into the cylinder.

Therefore, the high-pressure, high-temperature refrigerant introduced into the cylinder 1 from the fourth passage 10 as described above reaches the outdoor unit 2, such as a condenser, through the pipe 11 from the first passage 3, which is open at that time. It is further introduced into an indoor unit 4 such as an evaporator to cool the room, and then returns to the inlet side of the compressor 6 via a pipe 12, a second passage 5, a valve chamber 19, a third passage 7, and a pipe 13. The above is the cooling effect, but at this time the electromagnetic coil 20 is deenergized and no energy is wasted.

Next, when the electromagnetic coil 20 is excited from this state, the plunger 21 rises against the elasticity of the spring 27, the pilot valve 22 opens the through hole 23, and the rod 26 retracts into the through hole 25.
Therefore, the cylinder chamber of the piston 15 on the spring 16 side communicates with the second passage 5 via the through hole 25, the through hole 23, and the pilot circuit 24. However, since the second passage 5 has a low pressure, the high pressure refrigerant in the chamber on the spring 16 side of the cylinder is guided to the second passage 5. As described above, high pressure and high temperature refrigerant is introduced into the chamber on the switching valve 18 side of the cylinder, so the pressure in the cylinder chamber on the switching valve side is higher than that on the spring side. moves to the left in the figure against the elastic force of However, since this movement is instantaneous, the pressure in the flow path 5 increases as the flow path 5 opens into the cylinder during this movement, and the pressure on the spring side of the cylinder increases accordingly, causing the switching valve to move to the left. A stopping pressure balance does not occur due to the inertial motion stored in the piston 15 and the switching valve 18. Due to this movement of the piston, the switching valve 18 is connected to the connecting rod 17.
The valve chamber 19 moves in the same direction through the first passage 3.
and the third passage 7. The second passage 5 then opens into the cylinder. This state is shown in FIG.

In this manner, the electromagnetic coil 20 is deenergized immediately after the switching valve 18 switches each passage.

At this time, the plunger 21 descends, the pilot valve 22 closes the through hole 23, and the rod 26 descends into the cylinder chamber, engaging the groove 29 of the piston 15 facing at this time. In this state, the pressure in the chamber on the switching valve 18 side and the chamber on the spring side of the cylinder is the same as described above, and the piston 15 moves to the right in the figure due to the elasticity of the spring 16. Since it is engaged with 26, it does not move any further and stops at the engaged position. In this position, the valve chamber 19 of the switching valve 18 communicates between the first passage 3 and the third passage 7, and the second passage 5 opens into the cylinder. This state is shown in FIG.

Therefore, the high-pressure, high-temperature refrigerant discharged from the compressor 6 is
It is introduced into the chamber on the switching valve side of the cylinder from the passage 10 of the cylinder, and further from the second passage 5 to an indoor unit 4 such as an evaporator, an outdoor unit 2 such as a condenser, and is then opened through the valve chamber 19. First passage 3, third passage 7
The air then returns to the compressor to heat the room.

However, since the electromagnetic coil 20 is deenergized at this time as well, there is no wasted power consumption.

When the electromagnetic coil is excited again in this state, the plunger 21 rises against the elasticity of the spring 27, opening the through hole 23, and the rod 26 rises and leaves the groove 29 of the piston. However, immediately after the electromagnetic coil is excited, the inside of the second passage 5 is at high pressure as shown in FIG. The piston 15 is introduced into the chamber on the spring 16 side and has the same pressure as the chamber on the switching valve 18 side of the cylinder, and the piston 15 moves to the right in the figure due to the elasticity of the spring 16, and the switching valve 18 returns to the same position as in FIG. 1. The second and third passages are opened through the valve chamber 19 and the first passage 3 is opened into the cylinder. This state is shown in FIG. At this time, as in the case described above, the movement of the switching valve is instantaneous, so the rightward movement of the switching valve will not be stopped due to pressure balance.

Next, when the electromagnetic coil 20 is deenergized, all the elements of the four-way valve of the present invention return to the state shown in FIG. 1 and cool the room.

As described above, according to the present invention, since the electromagnetic coil is deenergized during heating and cooling, it is possible to provide a four-way valve particularly suitable for energy consumption.

[Brief explanation of drawings]

Figure 1 is a schematic sectional view of an embodiment of the four-way valve of the present invention during cooling, Figure 2 is a similar sectional view immediately after switching from cooling to heating, and Figure 3 is a similar sectional view during heating. FIG. 4 is a similar sectional view immediately after switching from heating to cooling. 1... Cylinder, 2... Outdoor unit, 3... First passage, 4... Indoor unit, 5... Second passage, 6...
Compressor, 7... Third passage, 10... Fourth passage, 15... Piston, 16... Spring, 18...
Switching valve, 20... Electromagnetic coil, 21... Plunger, 24... Pilot circuit, 26... Rod,
29...Engagement part.

Claims (1)

[Scope of utility model registration request] a first passage communicating with an outdoor unit such as a condenser;
A second passage that communicates with an indoor unit such as an evaporator and a third passage that communicates with the inlet side of the compressor are arranged side by side on one side, and these passages face each other and communicate with the discharge side of the compressor. a cylinder having a fourth passage on the other side, a piston that slides within the cylinder and has a small hole opening into the cylinder and an engaging portion on the periphery; a switching valve that selectively switches between the first, second, and third passages; a spring that constantly deflects the piston toward the switching valve; an electromagnetic coil provided outside the cylinder; a plunger actuated by operation; a pilot circuit closed by the plunger when deenergized and having one end open to the second passage and the other end open to the plunger chamber; one end fixed to the plunger and the other free end. A four-way valve consisting of a rod facing into the cylinder, which rod selectively engages with the engaging portion of the piston when the electromagnetic coil is deenergized.