JP2714444B2 - Shunt valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a flow dividing valve mainly used in a refrigerant circuit of an air conditioner.

[Prior Art] As shown in FIG. 6, in a multi-type air conditioner using two indoor units with one compressor 20, the refrigerant discharged from the compressor 20 receives T Character piping,
After passing through the capillary tube 25, it is sent to the indoor heat exchangers 22 and 23, returns to the suction port of the compressor 20, and forms a refrigerant circuit. In the above refrigerant circuit, the branch flow to the two indoor heat exchangers is performed by a T-shaped pipe. The required refrigerant amount of each of the indoor heat exchangers 22 and 23 is room temperature, the air volume of the air conditioning fan 24 of the indoor unit. In particular, when there is a large difference in the required amount of refrigerant, the flow amount of the refrigerant is determined not by the T-shaped pipe but by the capacity of the capillary tube 25 on the side where the required amount of refrigerant is large. There has been a problem that the amount of refrigerant flowing into the indoor heat exchanger is reduced, so that the flow is not accurately divided and the gas pressure fluctuates greatly.

[Means for Solving the Problems] According to the present invention, a flat valve seat having two conduction ports provided on a circumference at a predetermined angle away from the introduction port is fixed to a cylindrical valve box having an introduction port. At the opposite end of the valve seat of the cylindrical valve box, a flat lid having a cylindrical portion with a built-in rotor for the stepping motor is fixed, and a communication port is provided at one location around the inside of the valve box. An arc-shaped groove formed by connecting two conduction ports and being shallow in the direction of the two conduction ports is provided, a convex portion of a stopper is provided on a plane opposite to the groove, and the valve body is brought into contact with the convex portion provided on the lid. It is provided so as to be rotatable with respect to the valve seat and restricts the rotation.Furthermore, the outer periphery of the flat surface on the opposite side of the groove is partially provided with a wall engraved with a rack so as to mesh with a pinion fixed to the shaft of the rotor. The present invention provides a flow dividing valve comprising a valve element configured as described above.

[Operation] In the above configuration, when the position of the communication port of the valve body is at the center of the circumferential angle of the two communication ports, the opening areas are equal because the depths of the grooves of the two communication ports are the same, and the amount is the same. Can flow. By rotating the rotor of the stepping motor from this state, the valve body meshing with the pinion of the rotor is rotated, and by rotating the rotor by a predetermined angle, the depth of the groove of each conduction port is deeper on one side and the other is on the other side. Becomes shallower, the opening area can be changed, and the flow rate of the refrigerant can be made different. When the valve stopper is rotated to the position where the convex stopper of the valve body and the convex part of the lid come into contact with each other, one conduction port is closed by the flat portion of the valve body, and the other conduction port and the communication port between the valve body are circumferential. At the same position, all the refrigerant can flow.

Embodiment An embodiment will be described below with reference to the drawings.

The cylindrical valve box 1 is provided with an inlet 1a, and one end of the valve box 1 is separated from the inlet 1a by a required angle symmetrically (90 in FIG. 2).
Ii) A flat valve seat 2 having two conducting ports 2a and 2b fixed thereto, and a case 4 having a rotor 3 of a stepping motor 12 built therein is fixed to the other end of the valve box. And a bearing cover 6 is fixed to one end of the case 4. A communication port 7a is provided at one place in the outer peripheral portion inside the valve box 1, and a communication port 2a is provided on the lower side surface portion from the communication port 7a.
And 2b, an arc-shaped groove 7b that is shallow in the circumferential direction is provided on the upper side surface opposite to the groove, and a wall 7d in which a rack is cut inward on a part of the inner circumference, and this wall 7d The valve body 7 having the convex stoppers 8a and 8b corresponding to the positions of the conducting ports above and having the shaft 9 provided at the center is rotatably arranged. At the center of the lid 5, a bearing 9a is fixed, and the valve body 7 is supported via a shaft 9. Further, a stopper 10 is fixed to one portion of the lid 5, and the stopper 10 and the convex stoppers 8a and 8b are in contact with each other to limit the rotation angle of the valve body 7. A pinion 11 is fixed to one end of the shaft of the rotor 3 of the stepping motor 12 and meshes with a rack 7c of the valve body 7.

Next, the operation will be described. The inlet 1a is connected to the outdoor heat exchanger 21, and the conducting ports 2a and 2b are connected to the indoor heat exchangers 22 and 23, respectively (FIG. 5). Now, when the refrigerant demand of each indoor unit is equal, the communication port 7a is on the extension of the introduction port 1a, and the conduction ports 2a and 2b opened by the arc-shaped groove 7b have the same opening area. ,
The same amount of refrigerant flows through the respective indoor heat exchangers 22 and 23 through the respective communication ports 2a and 2b. Next, if the required amount of refrigerant of the indoor unit changes depending on the indoor temperature, the air volume of the fan, and the like, for example, the indoor heat exchanger 22 needs more refrigerant, the stepping motor 12 sends the rotor 3 Rotates by the required amount and the valve element 7
Rotate counterclockwise as shown. At this time, the depth of the groove becomes deep at the conduction port 2a and becomes shallow at the conduction port 2b, and the flow rate of the refrigerant can be changed according to the respective opening areas. Further, the convex stopper 8b or 8a of the valve body 7 and the stopper of the lid are provided.
By rotating the valve body 7 clockwise or counterclockwise until 10 hits, it is possible to close one of the conduction ports 2a or 2b, respectively, and to flow all the refrigerant to one indoor heat exchanger. .

[Effect] The present invention has the above-described structure, and instead of diverting the refrigerant in the T-tube 26 as in the related art, the refrigerant is arbitrarily controlled by the stepping motor according to the required refrigerant amount of the indoor unit. Can be divided, and the refrigerant can be prevented from flowing to the indoor unit that is not operated, so that an economical operation of the air conditioner is possible. Further, when the amount of shunt is not changed, the power supply to the stepping motor can be stopped, which is economical.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of one embodiment of a flow dividing valve of the present invention, FIG.
1 is a cross-sectional view of the apparatus of FIG. 1, FIGS. 3 and 4 are perspective views showing the upper and lower surfaces of the valve body of FIG. 1, and FIG. The circuit diagram shown in FIG.
FIG. 2 is a circuit diagram showing a refrigerant circuit according to a conventional technique. 1 ... Cylindrical valve box, 1a ... Inlet, 2 ... Flat valve seat, 2
a, 2b… conduction hole, 3… rotor, 4… case, 5…
... Flat lid, 6 ... Bearing lid, 7 ... Valve, 7a ... Communication port, 7b ... Circular groove, 7c ... Rack, 7d
…… Wall, 8a, 8b …… Protrusion stopper, 9 …… Shaft, 9a …… Bearing, 10 …… Stopper, 11… Pinion, 12 …… Stepping motor, 20 …… Compressor, 21… Outdoor Heat exchanger, 22,23 ... Indoor heat exchanger, 24 ... Fan, 25 ... Capillary tube, 26 ... T-tube, 27 ... Control circuit.

Claims (1)

(57) [Claims] In a flow dividing valve having a cylindrical valve box, the valve box is provided with an introduction port and two conduction ports at one end symmetrically with respect to the circumference at positions separated by a required angle from the introduction port. A flat valve seat is fixed, a case containing a rotor of a stepping motor is fixed to the other end, and a lid provided with a convex portion protruding inward is fixed to the other end. A communication port is provided at one place on the outer peripheral portion of the cylinder, and communicates with the communication port and the two conduction ports on one end plane. The arc shape is formed so as to be shallow in the circumferential direction toward the two conduction ports. A groove is provided, a wall engraved with a rack on a part of the outer periphery is provided on the other end plane, and a cylindrical valve body provided with convex portions at both ends of the wall is rotatably disposed with respect to the valve seat. One of the protrusions of the wall is such that the communication port of the valve body and one of the two communication ports are at the same position on the circumference. Yes disposed to come contact,
A flow divider valve, wherein the rack of the valve body is engaged with a pinion fixed to one end of the rotor.