JPH0211667Y2 - - Google Patents

Description

[Detailed explanation of the idea]

[Industrial Field of Application] The present invention relates to the improvement of solenoid valves, and is particularly used in air-conditioning devices and the like. [Prior Art] A multi-room air conditioning system in which a single outdoor unit is provided with a plurality of indoor units includes, for example, one outdoor unit 1, a plurality of indoor units 2, etc., as shown in Fig. 1. are connected via gas refrigerant pipes 3 and liquid refrigerant pipes 4. The above outdoor unit 1 is
A two-way solenoid valve 10 that controls the flow of refrigerant to the compressor 5, the four-way air-conditioning/heating switching valve 6, the outdoor heat exchanger 7, the check valve 8, the heating expansion valve 9, and the indoor unit 2...
It is equipped with... The indoor units 2, 2 each include an indoor heat exchanger 11, a cooling expansion valve 12, and a check valve 13. Further, numeral 14 in the figure is an operating valve. In this air-conditioning/heating device, the refrigerant flows as shown by the solid line arrow → during cooling and as shown by the broken line arrow --→ during heating. In this heating and cooling system, an outdoor unit 1 and indoor units 2, 2 are connected in parallel, and in this case, this is done as follows. That is, the inside of the equipment of the indoor unit 2, the gas refrigerant pipe 3, and the liquid refrigerant pipe 4 are filled with air, and if they are simply connected as they are, air will enter the refrigerant circuit and mix with the refrigerant. As a result, the coefficient of performance decreases due to an increase in condensing pressure, and since water is contained in the air, many troubles such as freezing during the refrigeration cycle and clogging of the expansion valve occur due to moisture contamination. In order to avoid this, it is necessary to perform a public air purge (air expulsion) before completing the connection to replace the air contained in the piping system with refrigerant before starting operation. By the way, the conventional two-way solenoid valve 10 used in the above-mentioned air conditioning system is provided corresponding to each pipe, and these are used to flow the refrigerant in the refrigerant circuit to one or both of the indoor units 2, 2. be. Therefore, the two-way solenoid valve 10 opens and closes only when current flows through the normal operation switch ON, and the flow of refrigerant is closed when the valve is not in operation. Therefore, when performing air purge, the two-way solenoid valve 10 can be
cannot be opened or closed. The operating valve 14 provided on the outer panel of the outdoor unit 1 is closed when shipped from the factory, and is gradually opened during air purging to drive out the air inside the refrigerant pipes 3, 4 and the indoor units 2, 2, and then fully opened. It is used for driving. For this reason, conventionally, in order to perform air purge during installation work, the two-way solenoid valve 10 is temporarily energized to open the flow of refrigerant. However, when installing heating and cooling equipment in newly built homes, there are many cases where the power is not turned on. Further, even if a power source is available, temporarily turning on electricity is cumbersome and requires repair after the work is completed, which has the disadvantage of complicating installation work. [Problems to be solved by the invention] The present invention has been made in view of the above circumstances, and provides a solenoid valve that can be used not only as a normal solenoid valve but also can be kept open even when no electricity is applied. For example, the purpose is to facilitate air purging of air conditioning equipment. [Means for solving the problem] The solenoid valve of the present invention is a pilot type solenoid valve in which an inlet port 28 and an outlet port 21 are communicated and shut off by a main valve 22 that moves up and down according to the up and down movement of a plunger 33. Main valve 2
2 by bypassing inlet port 28 and outlet port 2
1, and an elastic body 2 is placed in the passage 19 in a direction that always opens the passage 19.
Check valve 2 that is pressed by valve 9 and closes the passage 19 due to a pressure difference when fluid flows in from the inlet port 28 side.
7. [Function] The above-described solenoid valve can be used as a normal solenoid valve by energizing the solenoid coil. Furthermore, since the built-in check valve has a built-in elastic body (for example, a spring) that presses it in the opening direction, it can be used in an open state when no electricity is applied. Therefore, for example, air purging of a heating and cooling system can be performed without a power supply, making the work extremely easy. [Example] Hereinafter, an example in which the solenoid valve of the present invention is applied to an air-conditioning device will be described with reference to the drawings. The air conditioning system using the solenoid valve according to the present invention is
As shown in the figure, the combinations of equipment in the outdoor unit 1 and the indoor units 2, 2 and their connections are almost the same as those shown in FIG. However, it differs from the air conditioning system shown in FIG. 1 in that the two-way solenoid valve 10 corresponding to the gas refrigerant pipe 3 is replaced with a pilot type solenoid valve 15 with a check valve according to the present invention. Hereinafter, this solenoid valve 15 will be explained based on FIGS. 3 and 4. The electromagnetic valve 15 includes a valve body 16 and an electromagnetic housing 17 fixed to the upper part of the valve body 16. The valve body 1
6 forms a main valve chamber 18 inside, and this main valve chamber 18
communicates with an outlet port 21 through a communication passage 19 at its side bottom and a valve seat 20 at its center. The main valve chamber 18 has a main valve 22 loosely fitted therein with a slight gap between the main valve chamber 18 and the wall surface of the main valve chamber 18, and presses the main valve 22 upward with a spring 23. A soft plastic disk 24 provided in the center corresponds to the valve seat 20 communicating with the outlet port 21, and a pilot port 25 is formed in the center of the disk 24. Furthermore, inside the valve body 16, a main valve chamber 1 is provided.
A check valve chamber 26 is formed which communicates with the valve 8 through a communication passage 19. A valve seat 36 is provided between the check valve chamber 26 and the outlet port 21, and a check valve 27 having a groove 27a therein, as shown in FIG. 4, is brought into contact with and separated from the valve seat 36. Check valve chamber 26 then communicates with inlet port 28 . Further, this check valve 27 is pressed to the right in the figure by a spring 29 which is an elastic body. Further, a head 30 and a cylindrical guide 31 are attached to the housing 17, and a plunger 33 operated by an electromagnetic coil 32 is disposed within the guide 31.
The spring 23 is inserted between the plunger 33 and the head 30 so that the conical portion 34 at the tip of the plunger 33 is pressed against the pilot port 25.
A pressing spring 35 that is stronger than that is compressed. The inlet port 28 of the solenoid valve 15 is connected to the M side of the piping shown in FIG. 2, and the outlet port 21 is connected to the N side. The solenoid valve 15 configured in this way is used during cooling.
They act as shown in Table 1 below during heating and air purge.

[Effect of idea]

As detailed above, the solenoid valve of the present invention not only can be used as a normal solenoid valve, but also can be used in an open state even when the power is not energized.For example, it facilitates air purging of air conditioning equipment and reduces the complexity of installation work. It has remarkable effects such as being able to eliminate the problem.

[Brief explanation of drawings]

Fig. 1 is a refrigerant circuit diagram of an air conditioning system using a conventional solenoid valve, Fig. 2 is a refrigerant circuit diagram of a refrigerant heating system using a solenoid valve according to the present invention, and Fig. 3 is a refrigerant circuit diagram of a refrigerant heating system using a solenoid valve according to the present invention. FIG. 4 is a sectional view of the pilot type solenoid valve with a stop valve, taken along the - line in FIG. 3. 1...Outdoor unit, 2...Indoor unit, 3
... Gas refrigerant pipe, 4 ... Liquid refrigerant pipe, 5 ... Compressor, 6 ... Four-way valve for switching between air conditioning and heating, 7 ... Outdoor heat exchanger, 8 ... Check valve, 9 ... Expansion valve for heating , 10
... Two-way solenoid valve, 11 ... Indoor heat exchanger, 12
...Air conditioning expansion valve, 13...Check valve, 14...Operation valve, 15...Pilot type solenoid valve with check valve, 1
6... Valve body, 17... Solenoid housing, 18... Main valve chamber, 19... Communication passage, 20...
Valve seat, 21...Outlet port, 22...Main valve, 23...Spring, 24...Disc, 2
5... Pilot port, 26... Check valve chamber, 2
7... Check valve, 27a... Groove, 28... Inlet port, 29... Spring (elastic body), 30... Head, 31... Cylindrical guide, 32... Electromagnetic coil, 33... Plunger, 34... Conical part, 35
...Press spring, 36...Valve seat.

Claims (1)

[Scope of utility model registration request] In a pilot type solenoid valve that communicates and shuts off an inlet port 28 and an outlet port 21 by a main valve 22 that moves up and down according to the up and down movement of a plunger 33, the main valve 22 is bypassed and the inlet port 28 and the outlet port 21 are connected. In addition to forming a passage 19 communicating with the passage 19, the passage 19 is always pressed by an elastic body 29 in the direction in which the passage 19 is opened, and when fluid flows in from the inlet port 28 side, the passage 19 is closed due to a pressure difference. A solenoid valve characterized by being provided with a stop valve 27.