JPH0449419Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to the structure of a solenoid valve that operates reversibly.

Conventional reversible solenoid valves have different flow paths for the forward and reverse directions, so there is a difference in the flow rate of the medium flowing in the forward direction and the medium flowing in the reverse direction, making it impossible to obtain a valve with satisfactory control performance. is the current situation.

The present invention was made to solve the above problems, and in a solenoid valve having a pilot valve and a main body valve, two joints are arranged perpendicular to the axial direction of the main body valve and are opposed to each other. ,
The object of the present invention is to provide a solenoid valve that is provided with two valve seats that support and fix this joint, and that is provided with one slide valve that slides between these seats.

FIG. 1 shows the configuration of the electromagnetic valve according to the present invention in a closed state. 1 is a main body valve, and both ends of the cylindrical shape are closed. Reference numerals 2 and 2' denote valve seats, which are fixed to the inner wall surfaces of the central upper and bottom portions of the main body valve 1. Pistons 3 and 3' slide between the valve seats 2 and 2' and the end of the main valve body 1 along the inner wall surface of the valve. The pistons 3, 3' have piston needles 4, 4' and bleed holes 5, respectively.
5'. 6 is a slide valve, both ends of which are connected to pistons 3 and 3'. In this embodiment, the slide valve 6 slides on the valve seat 2', and a slight space is provided between the slide valve 6 and the valve seat 2'.
7 is a right chamber formed by the piston 3 and the main valve 1. 8 is a central chamber formed between pistons 3 and 3'. 9 is a right chamber formed between the piston 3' and the main valve 1. 10,
10' is a joint, which is supported by the valve seats 2 and 2', respectively. Coupling 10 is in this embodiment coupled to the high pressure side of a compressor (not shown) and coupling 10' is coupled to its low pressure side. Fitting 1
0 and 10' are arranged to face each other in a direction perpendicular to the moving direction of the slide valve 6. 11,11'
are inlets provided at both ends of the main body valve 1,
It fits into the tips of the piston needles 4, 4'.

12 is a pilot valve, and main valve 1
are connected to the inlets 11, 11' through tubes 13, 14. A plunger 15 has a needle 16 at its front end and a spring 17 at its rear end. A needle 18 is disposed coaxially and oppositely to the needle 16, and the needle 18
is pressed by a spring 19. A solenoid coil 20 attracts the plunger 15 against the spring 17 when energized. 21
is a low pressure tube connecting pilot valve 12 to the low pressure circuit of a refrigerator (not shown).

FIG. 2 shows the configuration of the solenoid valve according to the present invention in an open state. The same numbers as in FIG. 1 indicate the same parts.

FIG. 3 shows details of the structure of the slide valve 6 used in the solenoid valve of the present invention. 61 is a through opening, and 62 is a closing opening. Through opening 61 is located coaxially between joints 10 and 10' when solenoid coil 20 is energized. Closed opening 6
2 is positioned coaxially between joints 10 and 10' when solenoid coil 20 is deenergized.

The operation of the solenoid valve of the present invention will be described with reference to Fig. 1 and Fig. 2. In Fig. 1, the solenoid coil 20 is in a de-energized state, and the plunger 15 is energized by the pressing force of the spring 17.
The needle 16 protrudes from the tip of the plunger 15 and closes the inlet of the tube 14 when the plunger 15 moves. The needle 16 is connected to the needle 15 which is disposed coaxially opposite to the needle 16.
8, the needle 18 is abutted against the tip of the spring 19
At this time,
The needle 18 connects the inlet of the tube 13 to the inlet of the low pressure tube 21. In this state,
The high pressure refrigerant in the joint 10 is introduced into the center chamber 8 through the gap between the valve seat 2 and the slide valve 6, and is then introduced into the right chamber 7 and the left chamber 9 through the bleed holes 5 and 5' of the pistons 3 and 3', respectively.
The right chamber 7 is in a high pressure state because the tube 14 is closed, whereas the left chamber 9 is in a low pressure state because the tube 13 is connected to the low pressure tube 21. As a result, the pistons 3, 3' move from the right chamber 7 to the left chamber 9 and stop when the tip of the piston needle 4' of the piston 3' fits into the inlet 11'. At this point, the closing opening 62 of the slide valve 6 is in contact with the joint 1.
0 and 10', the solenoid valve completes the shutoff operation.

In FIG. 2, the solenoid coil 20 is energized, and the plunger 15 is attracted against the spring force of the spring 17. In response to this, the needle 16 opens the inlet of the tube 14, and at the same time, the needle 18 is pulled by the spring 17 together with the movement of the needle 16.
The needle 18 closes the inlet of the tube 13, so that the high-pressure refrigerant in the joint 10 flows from the center chamber 8 through the bleed holes 5, 5' into the left chamber 9 and the right chamber 7. The left chamber 9 is in a high-pressure state because the inlet of the tube 13 is closed by the needle 18, and the right chamber 7 is in a high-pressure state.
Since the low pressure tube 14 is connected to the low pressure tube 21, the piston 3,
The piston 3' is moved from the left chamber 9 toward the right chamber 7, and stops when the tip of the bleed hole 5 of the piston 3 engages with the inlet 11. As a result, the through opening 61 of the slide valve 6 is similarly positioned coaxially between the joints 10 and 10', and the solenoid valve completes the opening operation.

The electromagnetic valve according to the present invention includes a slide valve that moves in the axial direction of the main body valve and has a through opening and a closing opening, and two joints that are provided at mutually opposing positions in a direction perpendicular to the direction of movement of the slide valve. Because of the symmetry, it is possible to obtain the same refrigerant shutoff and opening control ability even if either joint is on the high-pressure side of the refrigerant.

[Brief explanation of the drawing]

FIG. 1 shows the configuration of the electromagnetic valve according to the present invention in a closed state. FIG. 2 shows the configuration of the solenoid valve of the present invention in an open state. FIG. 3 shows the structure of a slide valve used in the solenoid valve of the present invention. 1...Body valve, 2, 2'...Valve seat, 6...Slide valve, 10, 10'...Joint, 12...Pilot valve, 15...Plunger, 7...Spring, 20...Solenoid coil , 61...through opening, 62...closed opening.

Claims (1)

[Claims for Utility Model Registration] A single solenoid coil 20 that is energized by the application of a control signal and deenergized by the non-application of the control signal.
and a pilot valve 12 having a common outlet opening that is opened and closed by energization and deenergization of the solenoid coil and communicates with the first and second introduction openings and the refrigerator; and the first and second introduction openings of the pilot valve. A main body valve 1 is connected to the opening via a connecting tube and opens and closes in response to the opening and closing of the pilot valve, the main body valves being located at the center of the main body valve and facing each other in a direction perpendicular to the axis of the main body valve. a pair of joints 1, one of which is connected to the high pressure side of the compressor and the other to the low pressure side of the compressor;
0 and 10', valve seats 2 and 2' that are fixed on the inner wall surface of the central part of the main body valve and support the joint, and a valve seat 2 and 2' that is fixed to the inner wall surface of the central part of the main body valve, and a space between the valve seat and the end of the main body valve. a piston 3 that slides along the wall surface;
3'; and a slide valve 6 having the piston coupled to both ends thereof, sliding on the valve seat, and having a through opening and a closing opening, wherein when the solenoid coil is energized, the through opening engages with the joint. the body including a slide valve coaxially located to bring the joints into communication with each other, and wherein the closing opening is located coaxially with the joint to isolate the joints from each other when the solenoid coil is deenergized; A solenoid valve comprising: a valve;