JPH04316778A - Solenoid valve device - Google Patents

Abstract

PURPOSE:To prevent the generation of loud passage noise during the passage of fluid through a solenoid valve device when a pressure difference between the inlet side and the outlet side of the solenoid valve device is high. CONSTITUTION:A communicating passage 20 for interconnecting a lower valve chamber 7 and a flow passage 11 on the outlet side bypass a passage in a main valve body 3 of a solenoid valve device is provided. A solenoid valve 21 for controlling a pressure is located to the communicating passage 20, and in prior to control of a main valve body 3, a solenoid valve 21 for controlling a pressure is driven.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve device for fluid control used in a refrigerant circuit of a multi-room air conditioner.

0002

2. Description of the Related Art FIG. 3 is a sectional view showing a solenoid valve device conventionally used in a refrigerant circuit of a multi-room air conditioner. A main valve seat formed on the inner wall of the main body 1; 3 a main valve body that is slidably provided along the inner wall of the device main body 1 and opens and closes a fluid passage by coming into contact with and separating from the main valve seat 2; 4 a main valve; A spring 5 that presses the body 3 against the main valve seat 2 is a valve chamber that houses the main valve body 3, and is divided into an upper valve chamber 6 and a lower valve chamber 7 by the main valve body 3. An inflow pipe 8 is attached to the side surface of the lower valve chamber 7, forming an inlet side flow passage 9. In addition, an outflow pipe 1 is provided at the lower end of the device main body 1.
0 is attached, and forms an outlet side flow passage 11 together with a space provided below the lower valve chamber 7. Reference numeral 12 denotes a solenoid valve attached to the upper part of the device body 1, which connects a communication pipe 13 and a communication port 14.
The upper valve chamber 6 is configured to communicate with the outlet side flow passage 11 via the upper valve chamber 6.

Next, the operation will be explained. First, when the solenoid valve 12 is closed, the main valve body 3 is pressed against the main valve seat 2 by the force of the spring 4 and the fluid pressure in the upper valve chamber 6, and the inlet side flow passage 9 and the outlet side flow passage 11 are blocked. has been done. When the electromagnetic valve 12 is energized to open the valve, the fluid in the upper valve chamber 6 passes through the communication pipe 13 from the communication port 14 to the outlet side passage 1.
Therefore, the fluid pressure in the upper valve chamber 6 decreases, and the main valve body 3 is pushed up by the fluid pressure supplied to the lower valve chamber 7 via the inflow pipe 8, and the fluid flows to the inlet. From the side flow passage 9 through the lower valve chamber 7 to the outlet side flow passage 11
It will flow to. Next, when the solenoid valve 12 is closed again, the fluid passes through the gap between the main valve body 3 and the wall of the device body 1.
It gradually flows from the lower valve chamber 7 to the upper valve chamber 6, and the upper valve chamber 6
fluid pressure increases. Therefore, the main valve body 3 is pressed downward, and the main valve body 3 comes into contact with the main valve seat 2 again, blocking the inlet side flow passage 9 and the outlet side flow passage 11. Become.

0004

As described above, in the conventional solenoid valve device, when the solenoid valve 12 is opened, the main valve body 3 is released from the main valve seat 2, and the fluid is transferred from the inlet side flow passage 9 to the outlet side. When the valve is opened to flow into the flow passage 11, but there is a large pressure difference between the fluid on the inlet side and the outlet side, a large amount of fluid is suddenly depressurized and flows out, which causes a problem in that a large passing noise is generated. was there. This invention was made to solve such problems, and by controlling the fluid pressure difference between the inlet side flow passage 9 and the outlet side flow passage 11, when the fluid passes through the device main body 1, This is an attempt to suppress the passing noise generated in the

[0005]

[Means for Solving the Problems] A solenoid valve device according to the present invention is configured such that a communication passage connecting an inlet side flow passage and an outlet side flow passage is provided, and a solenoid valve for pressure control is provided in this communication passage. This is what I did.

[0006]

[Operation] The solenoid valve device according to the present invention opens the pressure control solenoid valve when the fluid pressure difference between the inlet side flow path and the outlet side flow path is large, and allows the fluid in the lower valve chamber to flow through the communication path to the outlet side. After the fluid flows out into the flow path and the fluid pressure difference between the inlet side flow path and the outlet side flow path becomes small, the main valve body is opened to allow the fluid to pass through.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. 1 and 2, which are one embodiment. FIG. 1 shows a solenoid valve device 1 according to the present invention.
00. In the figure, 20 is the device main body 1.
The lower valve chamber 7 is communicated with the outlet side flow passage 11 through a communication passage formed in the lower valve chamber 7 so as to bypass the passage formed by the main valve body 3. Reference numeral 21 denotes a control electromagnetic valve provided to open and close this communication passage 20, and is composed of a valve body 22, an electromagnetic coil 23, and the like. Note that the other configurations are almost the same as the conventional example shown in FIG. FIG. 2 shows an example in which the solenoid valve device 100 shown in FIG. 1 is used in a refrigerant circuit of a multi-room air conditioner. This refrigerant circuit includes a compressor 30 that compresses refrigerant, a four-way valve 31 that switches the flow of refrigerant, an outdoor heat exchanger 32, a check valve 33, a gas-liquid separator 34, an expansion valve 35,
Indoor heat exchanger 36, solenoid valve device 100a according to the present invention
, 100b, etc. Note that A indicates an outdoor unit, and B1, B2, and B3 indicate a plurality of indoor units.

[0008] This air conditioner performs both heating and cooling operations, and since they are almost the same, the operation during heating will be explained. The high-temperature, high-pressure refrigerant discharged from the compressor 30 flows into the indoor unit B1 via the four-way valve 31, check valve 33, gas-liquid separator 34, and electromagnetic valve device 100b, and is exchanged with indoor air at the indoor heat exchanger 36. It is condensed and liquefied through heat exchange. The refrigerant in a liquid state is then depressurized through the expansion valve 35 and passed through the check valve 33 to the outdoor heat exchanger 32.
is supplied to The refrigerant that has been heat exchanged in the heat exchanger 32 and turned into a gaseous state is supplied to the compressor 30 again, and the circulation cycle is repeated thereafter.

In such a refrigerant circuit, when one of the indoor units B1 to B3 in operation is temporarily stopped, the solenoid valve device 100b that controls refrigerant to the indoor unit to be temporarily stopped is closed, and the high-temperature The supply of high-pressure refrigerant is stopped, but at this time, the gas that filled the temporarily stopped indoor unit is cooled by the indoor temperature and liquefies, resulting in a decrease in pressure. On the other hand, since the compressor 30 operates if even one of the indoor units B1 to B3 is operating, the refrigerant gas in the connecting pipe maintains a high pressure state. Therefore, a large pressure difference occurs between the inflow side and the outflow side of the solenoid valve device 100b that supplies refrigerant to the temporarily stopped indoor unit. Further, when switching from heating operation to cooling operation, the solenoid valve device 100b is closed and the solenoid valve device 100a is opened.
A large pressure difference will occur between the inflow and outflow sides. However, in the solenoid valve device of the present invention, before the main valve body 3 is released from the main valve seat 2, first, the electromagnetic coil 23 of the pressure control solenoid valve 21 is energized to move the valve body 22, and the valve body 22 is moved. Passage 20 is opened. Therefore, the high-pressure refrigerant flows from the inlet side flow passage 9 to the lower valve chamber 7 and the communication passage 20.
It flows out to the outlet side flow passage 11 through the passage. At this time, by forming the communication passage 20 or the valve passage to be narrow, a large amount of refrigerant does not pass through suddenly, and therefore no large passing noise is generated. In this way, the refrigerant is allowed to pass through the pressure control solenoid valve 21 for a while to reduce the difference between the fluid pressure on the inlet side and the fluid pressure on the outlet side, and then the solenoid valve 12 is driven. The main valve body 3 and the main valve seat 2 are separated, and fluid is allowed to pass between them. At this time, the pressure difference between the fluids is small, so no large passing noise is generated.

0010

As described above, according to the present invention, since the device main body is provided with a communication passage that bypasses the passage through the main valve body, and a pressure control solenoid valve is provided in this communication passage, the inlet Even when there is a large pressure difference between the side and the outlet side, the generation of fluid passage noise can be suppressed.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of a solenoid valve device according to the present invention.

FIG. 2 is a diagram showing an example of a refrigerant circuit of a multi-room air conditioner using the solenoid valve device according to the present invention.

FIG. 3 is a sectional view showing the structure of a conventional solenoid valve device.

[Explanation of symbols]

1　Device body 2 Main valve seat 3 Main valve body 5 Valve chamber 6 Upper valve chamber 7 Lower valve chamber 9 Inlet side flow passage 11 Outlet side flow path 12 Solenoid valve 13 Flow pipe 20 Communication path 21 Solenoid valve for pressure control 22 Valve body 23 Electromagnetic coil

Claims (1)

[Claims] 1. A device body formed into a cylindrical shape, a main valve body formed to be slidable along an inner wall of the device body,
A solenoid valve that controls the pressure in the upper valve chamber divided by the main valve body, slides the main valve body, and allows fluid to flow through a passage through the main valve body, and a solenoid valve that bypasses the main valve body. An electromagnetic valve device comprising: a communication passage that communicates an inlet-side fluid passage with an outlet-side fluid passage; and a pressure control solenoid valve provided in the communication passage to control fluid pressure on the inlet side of the main valve body.