KR20080093609A - Valve operated by a motor - Google Patents

Abstract

An electromotive valve is provided to reduce noise generated during operation and to increase durability by preventing collision between a magnet and a rotor cap with a gap keeper. An electromotive valve includes a main body(10), a guide protrusion(12), a rotor cap(20), a sheet groove(11), a valve unit(30), a rotor(40), a spring(60), and a stator coil assembly(50). The main body has an inlet port and an outlet port. The guide protrusion is protruded from a top of the main body. The rotor cap forms a valve chamber by being inserted out of the guide protrusion. The sheet groove is formed inside the guide protrusion. The valve unit connects the inlet port and the outlet port or blocks the inlet port and the outlet port by opening or blocking the main body. The rotor is rotatably installed in the valve chamber and has a multipolar magnet on outside of the rotor. The spring is interposed between the valve unit and the rotor, and presses the valve unit to the main body. The stator coil assembly is fixed on outside of the rotor cap.

Description

Electric valve {Valve operated by a motor}

1 is a perspective view showing an electric valve according to an embodiment of the present invention;

2 is an exploded perspective view of the electric valve shown in FIG.

3 is a cross-sectional view taken along line III-III of FIG. 2;

FIG. 4 is a diagram showing each switching position state and valve opening and closing characteristics of the electric valve shown in FIG.

Explanation of symbols on the main parts of the drawings

1: Electric valve 10: Valve body

11: seat groove 11a: outlet port

11b: shaft support groove 12: guide locking jaw

12a: Inlet port 13: Stopper

20: rotor cap 21: valve chamber

22: shaft support groove 30: valve body

31: base 32: body

33: port opening and closing part 34: shaft hole

40: rotor 41: cylindrical body

41a: stepped portion 41b: fixed engagement surface

42: magnet 42a: protrusion

43: rotation axis 44: extension

44a: incision groove 50: stator coil assembly

60: spring 70: clearance holding member

The present invention relates to a valve body for controlling the flow rate of the refrigerant by opening and closing the refrigerant passage of the refrigeration cycle, and more particularly, to an electric valve that can control the flow rate of the refrigerant efficiently by opening the valve body by a stepping motor will be.

A refrigeration cycle device for a refrigerator and a refrigerator includes a compressor, a condenser connected to the compressor, a valve connected to the condenser, a refrigerating chamber capillary tube (CTR) connected to one side of the valve, and a refrigerating chamber capillary tube, A refrigerator compartment evaporator connected to the refrigerator compartment, a freezer compartment capillary tube (CTF) connected to the other side of the valve, and a freezer compartment evaporator in which refrigerant from the refrigerator compartment evaporator and the freezer compartment capillary tube meets and flows into the refrigerator compartment; Refrigerant from the utility evaporator flows into the compressor to cycle.

Prior art related to the valve is disclosed in Korean Patent Application Laid-Open No. 2002-42701 (2002.06.05) "Electric solenoid valve and refrigeration cycle apparatus for refrigeration / freezer. The prior art has one inlet port and a plurality of outlets. A base plate forming a valve seat plate through the ports, respectively, and a cap-shaped rotor which is hermetically connected to one side of the base plate and acts together with the base plate to partition the rotor / valve chamber of an airtight structure therein. The port opening and closing portion is provided in the rotor and valve chamber so as to be rotationally displaceable, and has a port opening and closing portion that communicates with the inlet port and the outlet port on a cross section opposite to the base plate. Relative displacement with respect to the outlet port allows switching of the communication cutoff between the inlet port and the outlet port. A cylindrical stator coil assembling member of a valve body, a rotor with a magnet of a multi-pole structure of a stepping motor connected to the valve body rotatably installed in the rotor valve chamber, and a stepping motor fixed to an outer side of the rotor case. It relates to an electric switching valve having a.

The above prior art has the advantage of obtaining a large number of switching positions, but in order to connect the valve body and the rotor, a separate valve holder member must be provided, and a separate fitting part is not formed when welding the rotor case to the base plate. Great care is required.

In addition, the refrigerant flows to the outlet port in a mixed state or liquid state of the liquid phase, and the temperature difference between the outlet ports is large, and the refrigerant introduced through the inlet port flows under the interference of the valve body, causing a drift. As a result, there is a problem that the temperature deviation is very large because there is a difference in the amount of the refrigerant discharged to the outlet port.

The present invention has been made to solve the problems described above, an embodiment of the present invention relates to an electric valve that can be made in a simple configuration and shorten the assembly time.

In addition, an embodiment of the present invention relates to an electric valve capable of preventing the air from filling in the discharge pipe by preferentially discharging the liquid as well as preventing the flow of the fluid.

In order to achieve the above object, the present invention provides an electric valve having one inlet port and a plurality of outlet ports for controlling a flow rate of a refrigerant, comprising: a valve body through which the inlet port and the outlet port are formed; A guide catching jaw protruding from the upper surface of the valve body; A rotor cap fitted to an outer circumferential surface of the guide catching jaw so as to be hermetically fixed to the valve body to form a valve chamber therein; A seat groove formed in the guide catching jaw; A body having a shaft hole eccentrically rotatably formed in the seat groove, and a port opening and closing portion protrudingly formed to control opening and closing of the inlet port and the outlet port at one end of the body, and by rotating the port opening and closing part of the outlet port. A valve body for blocking or switching communication between the inlet port and the outlet port by controlling opening and closing; A rotor connected to the valve body and rotatably installed in the valve chamber, and having a magnet having a multi-pole structure mounted on an outer circumferential surface thereof; A spring installed between the valve body and the rotor to pressurize the valve body to the valve body; And it provides an electric valve comprising a stator coil assembly fixed to the outside of the rotor cap.

In another aspect, the present invention, it is possible to provide an electric valve, characterized in that the stopper is formed on the guide locking jaw of the valve body, and the magnet is provided with a projection to contact the stopper to control the rotation of the rotor. The stopper is for limiting the rotation of the valve body and controls the opening and closing of the valve by repeating the forward rotation and the reverse rotation. If there is no stopper, since the initial position of the valve body cannot be determined, it is difficult to control the opening and closing of the valve correctly. Therefore, the stopper serves to determine the initial position to control the opening and closing of the valve. In addition, a protrusion is formed on the magnet to allow interaction with the stopper of the valve body.

In another aspect, the present invention, the rotor is fitted in one direction by a rotating shaft penetrating the center and a cylindrical body having a stepped portion formed in the lower portion and a fixed coupling surface formed on the stepped portion, and a fixed coupling surface of the cylindrical body and the stepped portion. It is provided with an electric valve consisting of a magnet that is coupled and fixed, and a gap maintaining member installed on the upper end of the rotating shaft to maintain the gap between the rotor and the rotor cap between the rotor and the rotor cap, the bottom of the stepped portion of the cylindrical body An extension part having a cutout groove may be eccentrically formed about a rotation shaft, and the body of the valve body may be inserted into the cutout groove to provide an electric valve in which the valve body and the rotor are interlocked. The lower part of the rotor constitutes a stepped portion, and the stepped portion forms a fixed engagement surface on which a cut surface is formed. The stepped portion is configured for the formation of the fixed coupling surface. The fixed coupling surface allows the cylindrical body to be fitted to the magnet in only one direction and at the same time serves to prevent the possibility that the magnet coupled to the cylindrical body can idle. do. Therefore, the magnet also constitutes a coupling surface that is coupled with the fixed coupling surface so that the fixed coupling surface is fitted. In addition, the gap retaining member is installed on the rotary shaft of the cylindrical body so as to maintain a predetermined gap for rotation between the magnet and the rotor cap. The gap retaining member may achieve a desired condition by inserting a washer made of plastic or the like. The bottom of the stepped portion of the cylindrical body is formed with an extension having an incision groove, the incision groove is preferably formed eccentrically about the axis of rotation of the cylindrical body. The valve body is coupled to the incision groove, and the reason for forming the incision groove eccentrically is to allow the valve body to be coupled to the incision groove only in one direction. If the valve body is inserted in the opposite direction, it is because the port opening / closing portion of the valve body cannot form a position where the opening and closing of the valve can be accurately controlled at a short distance from the protrusion of the magnet which is interlocked with the stopper. Therefore, the valve body must always maintain a predetermined distance from the projection of the magnet, so that the incision groove is formed eccentrically.

In another aspect, the present invention, the valve body may provide an electric valve consisting of a support body having the same height as the port opening and closing portion protruding to the body and one end of the body and the port opening and closing formed on the other end of the body, the port opening and closing portion The electric valve may be provided in a crescent shape, and a space may be formed between the port opening and closing portion and the support portion. Since the port opening and closing portion rotates in the seat groove, if there is fluid in the seat groove, it may cause friction with the fluid, and it is desirable to reduce the friction as much as possible. Therefore, it is preferable that the port opening / closing portion protrudes from one end of the valve body and the support portion is formed at the other end so that the valve body can easily rotate. In addition, a space is formed between the port opening and closing portion and the supporting portion so that the fluid can escape into the space according to the rotation of the valve body, so that the fluidity of the fluid can be reduced as much as possible. In addition, since the body is inserted into the extension portion of the incision groove, when the outlet port is opened, there is no portion in the upper portion of the outlet port that interferes with the movement of the fluid, so that the flow of the fluid is not disturbed, thus preventing the refrigerant from drift. You can do it.

In another aspect, the present invention, the rotor cap is fitted to the guide engaging jaw can be provided with an electric valve that is fixed by laser welding to the body. In the case of welding with the rotor cap, the valve body is heated by high-temperature welding heat, and thus the plastic body of the valve body can be deformed in general, and thus it is impossible to control the valve opening and closing. In the present invention, since the cap is welded to the valve body with a laser, the valve body can be prevented from being deformed because it is welded at a low temperature.

In another aspect, the present invention, it is possible to provide a motorized valve in which the inlet port is formed in the guide locking jaw in the configuration of each electric valve. Since the inlet port is located above the outlet port, there is an advantage of preventing the drift. That is, the outlet port is formed in the seat groove of the valve body, and the inlet port is formed in the guide catching projection protruding from the upper portion of the seat groove, the position of the inlet port is relatively higher than the outlet port. Therefore, when the fluid (liquid + gas) flows through the inlet port, the liquid refrigerant in the lower part is filled with the gaseous refrigerant in the seat groove, and the outlet port is opened by the rotation of the valve body, the liquid refrigerant is discharged first. The flow to the port ensures a stable flow of the fluid to prevent the drift, and thus has the advantage of reducing the temperature deviation.

1 is a perspective view showing an electric valve according to an embodiment of the present invention, FIG. 2 is an exploded perspective view of the electric valve shown in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2.

Electric valve 1 according to a preferred embodiment of the present invention is the valve body 10, the rotor cap 20, the valve body 30, the rotor 40, the stator coil assembly 50, the spring 60, the gap And a retaining member 70.

The valve body 10 is preferably formed in the middle portion in the shape of a disk as shown in Figure 2 in the seat groove 11 for receiving the valve body 30 to be described later, and the outer peripheral surface of the seat groove 11 Protruding and having a guide engaging jaw (12) formed in a circular shape from the outer diameter of the valve body 10 spaced apart inwardly.

Two outlet ports 11a are formed spaced apart from the seat grooves 11, and discharge pipes 11aa are welded and fixed to the respective outlet ports 11a. In addition, the seat groove 11 is formed with a shaft support groove (11b) for supporting the lower end of the rotary shaft 43 to be described later.

This seat groove 11 is to have a height difference between the inlet port (12a) and the outlet port (11a) to be described later, as shown in FIG. By doing so, there is an advantage in that the liquid portion of the introduced refrigerant, i.e., the refrigerant in which the liquid and gas are mixed, sinks and the gas portion is left floating so that the liquid portion preferentially flows into the discharge pipe 11aa.

The guide catching jaw 12 has an inlet port 12a in which an inlet pipe 12aa is welded and fixed to one side thereof, and a stopper for limiting rotation of the rotor 40 at a spaced position of the inlet port 12a ( 13) is formed. The guide catching jaw 12 not only guides the rotor 40 to be described later but also allows the rotor cap 20 to be described later to be easily coupled to the valve body 10 to facilitate welding as well as shortening the welding time. Let's do it.

The rotor cap 20 is hollow and is preferably made of stainless steel, and is fixed to the valve body 10 to form a valve chamber 21. The upper inner surface of the rotor cap 20 is preferably formed with a shaft support groove 22 for supporting the rotating shaft 43.

The rotor cap 20 is preferably laser welded to the valve body 10. In this way, the magnetic force of the magnet 42 (permanent magnet) is weakened due to the heat effect by arc welding or plasma welding, or the deformation of the valve body 30 can be prevented.

As shown in FIG. 2, the valve body 30 preferably has a rectangular body 32 in which the shaft hole 34 is eccentrically formed, and one end of the body 32 protrudes preferably in a crescent shape. Port opening and closing portion 33, and the support portion 31 is formed to protrude on the other end of the body (32). When the shaft hole is formed eccentrically, the direction is not changed when the valve body 30 is inserted into the cutout groove 44a of the rotor 40 which will be described later, thereby improving the ease of coupling, and the valve body 30 always It is advantageous to prevent the malfunction of the valve by being coupled in only one direction.

The valve body 30 reduces the specificity of the shape, that is, the occurrence of the drift of the fluid introduced through the inlet port 12a by the crescent-shaped port opening part 33 and the support part 31. It plays a role. Specifically, the refrigerant discharged by the rectangular body 32 does not directly interfere with or interfere with the upper portion of the valve body 30, and the port opening / closing portion 33 is connected to the outlet port by the crescent-shaped port opening / closing portion 33. When passing through 11a, only a part of the outlet port 11a can be prevented from being opened or closed to prevent or reduce the occurrence of drift.

The valve body 30 is composed of a body 32, a port opening and closing portion 33 protruding on one end of the body 32 and a support portion 31 protruding on the other end of the body 32, which is a support This is to place the spring 60 to be described later on the protruding portion of the port opening and closing portion 33 spaced apart from the portion 31.

As shown in FIGS. 2 and 3, the rotor 40 includes a rotation shaft 43 penetrating through the center, a stepped portion 41a formed at the bottom, and a fixed engagement surface 41b formed at the stepped portion 41a. Cylindrical body 41, the magnet 42 is fitted and fixed in one direction by the fixed coupling surface 41b of the cylindrical body 41 and the stepped portion (41a), the rotor 40 and the rotor cap ( 20 is composed of a gap holding member 70 installed on the upper end of the rotating shaft 43 to maintain the gap between the magnet 42 and the rotor cap 20, the stepped portion of the cylindrical body (42) ( 41a) an extension 44 having an incision groove 44a is formed eccentrically about the rotation shaft 43 on the bottom surface thereof, and the body 32 of the valve body 30 is inserted into the incision groove 44a. The valve body 30 and the rotor 40 are configured to interlock.

A projection 42a is formed at the lower end of the magnet 42 to contact the stopper 13 formed on the valve body 10 to set the initial position of the rotor 40 in the rotational direction.

The upper end of the rotary shaft 43 is inserted and supported in the shaft support groove 22 of the rotor cap 20, the lower end is inserted and supported in the shaft support groove (11b) of the valve body 10 of the rotor 40 It acts as a rotating shaft during rotation. In addition, the rotary shaft 43 penetrates the shaft hole 34 of the valve body 30 to serve to center the valve body 30 with respect to the valve body 10.

The body 32 of the valve body 30 is inserted into the incision groove 44a so that the valve body 30 and the rotor 40 are integrally rotated to determine the position in the rotational direction. The rotation angle of the valve body 30 with respect to the magnetic pole of the magnet 42 is set.

The stator coil assembly 50 is generally used and is fixed to the outer circumferential surface of the rotor cap 20 in a cylindrical shape.

The spring 60 is provided between the valve body 30 and the rotor 40 to elastically support the valve body 30 with respect to the valve body 10. Specifically, the spring 60 is inserted into the extension portion 44 of the rotor 40 so that the lower end is placed on the front and rear ends of the upper surface of the valve body 30. The spring 60 preferably uses a compression coil spring.

The gap retaining member 70 is inserted into the rotation shaft 43 so that the lower surface is in contact with the upper side of the rotor 40, and the upper surface is in contact with the upper inner surface of the rotor cap 20 so that the magnet 42 is in the rotor cap 20. It serves to prevent the shock. The gap holding member 70 preferably uses a washer made of a plastic material.

The stepping motor is an electric actuator that rotates the valve body 30 in stages and includes the rotor cap 20, the rotor 40, and the stator coil assembly 50.

FIG. 4 is a diagram showing each switching position state and valve opening and closing characteristics of the electric valve shown in FIG.

The valve body 30 has a first switching position (0 °) in which both the first outlet port A and the second outlet port B correspond to the non-opening area by stepwise rotational driving by the stepping motor. ), The second switching position 54 ° in which only the second outlet port B corresponds to the open area, and the first outlet port A corresponds to the non-open area, and the first outlet port A ) And the second outlet port B correspond to only the open area, and the third switch position (189 °) corresponding to the open area, and the first outlet port A correspond to only the open area. B) switches between the fourth switching positions 297 degrees corresponding to the non-opening region, and four positions are obtained.

Since the present invention can be variously modified by those skilled in the art without departing from the scope of the claims claimed in the claims, the technical protection scope of the present invention is limited to the specific preferred embodiments described above. It is not limited.

According to the embodiment of the present invention as described above, first, it is possible to shorten the assembly time by forming a guide catching jaw in the valve body as well as made of a simple configuration.

Second, it is possible to reduce the temperature deviation between the refrigerant discharged by discharging the liquid preferentially and prevents the flow of the fluid by the shape of the valve body and the seat groove.

Third, by preventing the collision between the magnet and the rotor cap by the gap retaining member can improve the durability and noise reduction.

Fourth, by forming the axial hole of the valve body eccentrically, there is an advantage that can prevent the malfunction that may occur due to the valve body is incorrectly coupled.

Fifth, by installing the inlet port above the outlet port, it is possible to prevent the refrigerant discharged from the inlet port to enter the outlet port directly to prevent the drift.

Sixth, the valve body is inserted and coupled to the rotor to improve the rotational response of the valve body.

Seventh, the rotor cap is laser-welded to the valve body to prevent magnetic deterioration of the magnet by heat and to prevent the occurrence of scratches on the valve body surface.

Claims (8)

In the electric valve having one inlet port and a plurality of outlet ports for controlling the flow rate of the refrigerant, A valve body through which the inlet port and the outlet port are formed; A guide catching jaw protruding from the upper surface of the valve body; A rotor cap fitted to an outer circumferential surface of the guide catching jaw so as to be hermetically fixed to the valve body to form a valve chamber therein; A seat groove formed in the guide catching jaw; A body having a shaft hole eccentrically rotatably formed in the seat groove, and a port opening and closing portion protrudingly formed to control opening and closing of the inlet port and the outlet port at one end of the body, and by rotating the port opening and closing part of the outlet port. A valve body for blocking or switching communication between the inlet port and the outlet port by controlling opening and closing; A rotor connected to the valve body and rotatably installed in the valve chamber, and having a magnet having a multi-pole structure mounted on an outer circumferential surface thereof; A spring installed between the valve body and the rotor to pressurize the valve body to the valve body; And An electric valve comprising a stator coil assembly fixed to the outside of the rotor cap. The method of claim 1, A stopper is formed in the guide catching jaw of the valve body, and the magnet is provided with a projection for contacting the stopper to control the rotation of the rotor. The method of claim 1, The rotor includes a cylindrical body having a rotating shaft penetrating through a center and a stepped portion formed at a lower portion thereof, and a fixed coupling surface formed at the stepped portion, and a magnet fixed in one direction by a fixed coupling surface of the cylindrical body and the stepped portion. And a gap retaining member installed at an upper end of the rotating shaft to maintain a gap between the magnet and the rotor cap between the rotor and the rotor cap. The method of claim 3, wherein An extension valve having an incision groove is eccentrically formed about a rotation axis on the bottom of the stepped portion of the cylindrical body, and the valve body is inserted into the incision groove so that the valve body and the rotor interlock with each other. The method of claim 1, The valve body is an electric valve comprising a body and a port opening and closing portion protruding at one end of the body and a support portion having the same height as the port opening and closing portion protruding at the other end of the body. The method of claim 5, wherein The port opening and closing portion is formed in a crescent shape, the electric valve, characterized in that a space is formed between the port opening and closing portion and the support portion. The method of claim 1, The rotor cap fitted to the guide locking jaw is characterized in that the electric valve is fixed by laser welding to the main body. The method according to any one of claims 1 to 7, Electric valve characterized in that the inlet port is formed on the guide engaging jaw.

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