KR20230160144A - Refrigerant Expansion Valve - Google Patents

Abstract

The refrigerant expansion valve of the present invention includes a valve block 20 having a valve chamber 22 in which the flow path of the inlet portion 22b and the outlet portion 24c is connected across the bottom opening portion 22a, and the valve chamber 22. ) and the needle housing is moved up and down by a screw formed between the support body 30 and the needle housing is moved up and down while the rotation guide 21a and the needle housing are rotated by the operation of the actuator ( 40), a lifting body 42 that can be accommodated in the lifting groove 32 formed in the lower part of the support and has an open hole 42a through which fluid flows is formed on the side, and is connected to the lower part of the lifting body, and the needle It is composed of a flange 50 that opens and closes the bottom opening 22a communicating with the outlet by forming an orifice 52 forming a vertical penetration passage opposite to the lower part of the 40, and in addition to the opening hole, A pass path can be formed.

Description

Refrigerant Expansion Valve

The present invention relates to an electronic refrigerant expansion valve for controlling the flow distribution of refrigerant fluid, and more specifically, to a refrigerant expansion valve for stably controlling high-pressure refrigerant fluid.

A valve may be formed integrally with a refrigerant injection device that is installed in a refrigeration system and can be opened and closed while minimizing pressure drop loss.

In other words, airtightness is essential for refrigeration systems under various refrigerant environments, and unlike blocking valves, there is no pressure drop loss due to flow path changes and ball-type valves that are easy to open and close are often used.

In a refrigeration cycle, a ball valve with an inlet formed integrally may be installed in the circulation path formed between the condenser and the expansion valve and the circulation path formed between the evaporator and compressor.

In general, a ball valve is a ball member that opens and closes a pipe inside the valve body, and a seat (seat ring) in which the ball member is rotatably coupled, and the seat surface is pressed against the ball member on the inner peripheral surface of the valve body. This has a fixed configuration. The ball valve maintains the ball and seat in contact and operates to selectively open and close the flow path by rotation.

At this time, the ball valve has a ball member with a spherical surface with a hole in the center that serves as a flow path located in the center of the valve body. When the valve is opened, fluid passes through the central hole of the ball member, and the valve rotates 90 degrees in the open state. When closed, the blocked spherical part of the ball member matches the flow direction of the valve body and the seat flow direction and closes the flow path.

Recently, high-pressure ball valves only have flow rate control and passage complete closure functions to distribute refrigerant, so the need for finer refrigerant flow rate control is increasing.

Republic of Korea Patent Publication No. 2009-0077686 (July 15, 2009)

The purpose of the present invention is to provide a refrigerant expansion valve to more stably control the high-pressure refrigerant flow rate by adding refrigerant flow rate control and full or partial opening and closing functions to the needle valve. I'm doing it.

The refrigerant expansion valve according to an embodiment of the present invention for solving the above technical problem is formed with a valve chamber 22 in which the flow path of the inlet portion 22b and the outlet portion 24c is connected with the bottom opening portion 22a in between. A valve block 20, a rotation guide 21a accommodated on the upper side of the valve chamber 22 and rotated by the actuator 10, and vertically disposed within the valve chamber 22 to rotate the rotation guide 21a. A needle 40 that is lifted and lowered according to the direction, a lifting body 42 that can be accommodated in a lifting groove 32 formed in the lower part of the support and an open hole 42a through which fluid flows is formed on the side, and the lifting body It consists of a flange (50) connected to the lower part, forming an orifice (52) inside which forms a vertical penetration passage to face the lower part of the needle (40), and opening and closing the bottom opening (22a) communicating with the outlet. , A bypass flow path can be formed in addition to the open hole.

In the refrigerant expansion valve of the present invention, the amount of full opening/closing or opening of the orifice passage of the flange is adjusted according to the height of the needle that rises and falls according to the rotation direction of the rotation guide rotated by the actuator, and the amount of full opening/closing or opening of the needle is adjusted by the maximum elevation of the needle within the valve chamber. It has a structure that completely opens and closes the bypass passage between the outlet bottom opening in the valve chamber and the flange while being interlocked, and has the effect of selectively controlling the required amount of refrigerant fluid through the bypass passage.

1(a)(b) is a perspective view and cross-sectional view of a refrigerant expansion valve according to the present invention.
Figure 2 is a cross-sectional view of the flow path of the refrigerant expansion valve according to the present invention in a fully closed state.
Figure 3 is a cross-sectional view of the passage of the refrigerant expansion valve according to the present invention in a partially open state.
Figure 4 is a cross-sectional view of the passage of the refrigerant expansion valve according to the present invention in a fully open state.

Hereinafter, in order to fully understand the present invention, preferred embodiments of the present invention will be described with reference to the accompanying drawings FIGS. 1 to 4. Embodiments of the present invention may be modified in various forms, and the scope of the present invention should not be construed as being limited to the embodiments described in detail below. Therefore, the shapes of elements in the drawings may be exaggerated to emphasize a clearer description. It should be noted that the same configuration may be indicated by the same reference numeral in each drawing. Detailed descriptions of well-known functions and configurations that are judged to unnecessarily obscure the gist of the present invention are omitted.

Figures 1(a)(b) show a perspective view and a cross-sectional view of the refrigerant expansion valve according to the present invention, Figure 2 shows a cross-sectional view of the refrigerant expansion valve according to the present invention in a fully closed state, and Figure 3 shows a cross-sectional view of the refrigerant expansion valve according to the present invention in a partially open state, and Figure 4 shows a cross-sectional view of the refrigerant expansion valve according to the present invention in a fully open state.

The refrigerant expansion valve according to an embodiment of the present invention includes an actuator (10), a valve block (20), a rotation guide (21a) and a rotary blade (21b), a support body (30), a needle (40), and a needle housing (41). , an elevating body (42), and a flange (50).

That is, the valve block 20 is formed with a valve chamber 22 in which flow paths of the inlet portion 22b and the outlet portion 24c are connected with the bottom opening portion 22a interposed therebetween.

At this time, the inlet part 22b penetrates one side of the valve block 20 and connects the flow path with one side of the circumference of the valve chamber 22, and the outlet part 24c is connected to the other side of the valve block 20. A flow path is connected to the bottom opening 22a through .

The rotation guide (21a) is accommodated on the upper side of the valve chamber 22 and rotated by the actuator 10, and the needle 40 and the needle housing 41 are located at the vertical center of the rotation guide 21a. A vertically penetrating lifting groove 32 is formed so that the lifting body 42 is inserted and lifted up.

At least one open hole 42a is formed around the side surface of the lifting body 42 and connects the bottom opening 22a and the inlet 22b with a flow path, and at the center of the upper surface of the lifting body 42 is the A through hole (42b) is formed vertically to prevent interference when the needle (40) is raised and lowered.

The needle 40 and the needle housing 41 are vertically disposed within the valve chamber 22 and are raised and lowered according to the rotation direction of the support body 30.

The needle housing is raised and lowered by the rotation of the rotation guide (21a) on the upper part of the needle (40) inserted into the needle housing (41), and the rotational movement of the rotation guide (21a) is converted into a linear motion of the needle (40) to raise and lower the needle housing (41). A male and female screw is formed between the needle housing 41 and the support body 30, which are rotated by the rotation guide 21a. The needle 40 is inserted and coupled to the inside of the needle housing 41 and moves as one unit, but the lower end of the needle has a circular cross-section exposed downward from the needle housing, and a valve portion whose cross-sectional area narrows as it goes downward ( 40a) is formed. The needle housing extends further upward from the position where the screw is formed, and a transverse rotation guide (21a) is formed on the inside of the valve block, and guide wings (21b) are formed on the upper part of the needle housing, so that the actuator By the operation of , the rotation guide (21a) and the needle housing rotate and the needle housing is moved up and down by the screw formed between the support body (30).

The lower end of the needle 40 is vertically aligned with the center of the orifice 52 formed in the center of the flange 50 and is formed in a wedge-shaped cone shape to open and close the upper part of the orifice 52.

When the needle 40 is lowered, the distance between the wedge outer peripheral surface of the valve part 40a of the needle 40 and the inner peripheral surface of the orifice 52 is adjusted according to the depth inserted into the upper part of the orifice 52. It serves to finely adjust or completely open or close the orifice 52.

A coil spring 44a is installed inside the lifting body 42 and is inserted into the outer periphery of the needle 40 to press the flange 50 downward, and the upper end of the coil spring 44a is connected to the needle 40. It is connected to the lower surface of the adjustment nut 46, which is fastened to the outer peripheral surface of and adjusts the height.

At this time, the adjustment nut 46 is in contact with the ceiling of the elevating body 42 when the needle 40 is raised to the maximum to raise the elevating body 42 or when the needle 40 is lowered. By pressing the flange 50 while being spaced apart from the ceiling of 42, the flange 50 is lowered by the force of the coil spring 44a, and the elevating body 42 coupled to the flange 50 is lowered.

The flange 50 is connected to the valve chamber 22 via an elevating body 42 and simultaneously completely opens and closes the orifice 52 and the bottom opening 22a according to the elevation of the needle 40 or the orifice ( The flow rate is controlled so that only 52) is partially opened.

The upper part of the flange 50 is coupled to the lower end of the elevating body 42, and the lower part of the flange 50 is packed (packing) so as to surface contact the edge of the bottom opening 22a when the flange 50 is lowered. 60) is coupled, and the packing 60 is fixed in position by a fastening nut 62 fastened to the lower center of the flange 50.

In order to support the packing 60 by the ring-shaped fastening nut 62, the shape of the packing is divided into a lower packing part 60a that is in surface contact and an upper packing part 60b supported by the fastening nut.

The orifice 52 is formed vertically opposite the lower part of the needle 40 and is located at the center of the bottom opening 22a.

When the needle 40 is completely lowered, the flange 50 is lowered together with the lifting body 42 by the elastic force exerted by the coil spring 44a as shown in FIG. 2, and the bottom opening 22a of the valve chamber 22 is lowered. As the packing 60 is seated in surface contact, the passage between the flange 50 and the bottom opening 22a is completely closed and in a closed state, and the valve portion 40a of the needle 40 is completely inserted into the orifice 52. When the orifice 52 is brought into surface contact, the orifice 52 is closed and entered into a closed state, so that the flow path of the outlet portion 24c connected to the bottom opening portion 22a is completely closed.

When the needle 40 rises only to a certain height, the adjusting nut 46 fastened to the needle 40 is spaced apart from the ceiling of the lifting body 42, so the lifting body is moved by the elastic force pressed by the coil spring 44a. The flange 50 is lowered together with (42) and the packing 60 is brought into surface contact with the bottom opening 22a of the valve chamber 22, so that the passage between the flange 50 and the bottom opening 22a is completely closed and is in a closed state. do. That is, when the valve part 40a of the needle 40 is spaced apart from the orifice 52 and is in a slightly open state, the water is supplied to the inlet part 22b of the valve block 20 as shown in the arrow direction shown in FIG. 3. The refrigerant fluid flows into the elevating body 42 through the open hole 42a and at the same time passes through the slightly open orifice 52, supplying a small amount of refrigerant fluid to flow toward the outlet portion 24c.

When the needle 40 rises further by the operation of the actuator, the adjustment nut 46, which rises together with the needle 40, contacts the ceiling of the lifting body 42 and pushes the lifting body upward. At this time, the flange 50 coupled to the lower part of the lifting body 42 simultaneously rises, and the passage between the flange 50 and the floor opening 22a becomes open.

That is, because the orifice 52 is fully opened due to the maximum rise of the needle 40, the refrigerant fluid supplied to the inlet portion 22b flows through the open hole 42a as shown in the arrow direction shown in FIG. 4. A large amount of refrigerant fluid flows into the elevating body 42 and passes through the fully open orifice 52, and part of it passes through the bypass passage between the flange 50 and the bottom opening 22a toward the outlet 24c. It is supplied to flow.

Therefore, in the refrigerant expansion valve of the present invention, the passage of the orifice 52 of the flange 50 is completely opened and closed according to the height of the needle 40, which rises and falls according to the rotation direction of the rotation guide 21a rotated by the actuator 10. Alternatively, the opening amount is adjusted, and the bypass passage between the outlet bottom opening (22a) and the flange (50) in the valve chamber (22) is completely opened and closed while interlocked by the maximum elevation of the needle (40) in the valve chamber (22). Because of this structure, it is possible to stably control the required amount of refrigerant fluid to pass through the valve.

Meanwhile, a needle shaft portion 43 is formed in the transverse direction between the upper part of the needle 40 and the needle housing 41 to be smaller than the thickness of the needle, and a needle spring 44b is formed along the needle shaft portion, so that the needle or The bouncing action of the needle valve part can be alleviated.

10: Actuator 20: Valve block
21a: Rotation guide 21b: Guide wing
22: valve chamber 22a: bottom opening
22b: inlet 22c: outlet
30: support 32: lifting groove
40: Needle 40a: Valve part
41: Needle housing 42: Elevating body
42a: open hole 42b: through hole
43: Needle shaft 44a: Coil spring
44b: Needle spring 46: Adjusting nut
50: Flange 52: Orifice
60: Packing 60a: Lower packing
60b: upper part of packing 62: fastening nut

Claims (11)

In the refrigerant expansion valve,
A valve block 20 having a valve chamber 22 connected to a flow path of an inlet 22b and an outlet 24c with the bottom opening 22a interposed therebetween;
a rotation guide (21a) accommodated at the upper side of the valve chamber (22) and rotated by the actuator (10);
a needle housing 41 and a needle 40 that are vertically disposed in the valve chamber 22 and are raised and lowered according to the rotation direction of the rotation guide 21a; and
An elevating body (42) that can be accommodated in the elevating groove (32) formed in the lower part of the support and has an open hole (42a) through which fluid flows, formed on its side;
A flange (50) is connected to the lower part of the lifting body and forms an orifice (52) inside which forms a vertical penetration passage to face the lower part of the needle (40) to open and close the bottom opening (22a) communicating with the outlet. );
A refrigerant expansion valve, characterized in that the orifice (52) is opened and closed as the needle rises and falls. In claim 1,
The inlet portion 22b penetrates one side of the valve block 20 and is connected to one side of the circumference of the valve chamber 22 in a flow path,
The outlet portion (24c) penetrates the other side of the valve block (20) and is connected to the bottom opening (22a) with a flow path. In claim 2,
A refrigerant expansion valve, characterized in that a lifting groove (32) is formed at the vertical center of the support (30) to allow the needle (40) and the lifting body (42) to be inserted and lifted. In claim 3,
The needle is inserted into the needle housing (41), and a valve portion (40a) of the needle that opens and closes the orifice is formed in the lower part of the needle housing (41). In claim 4,
A refrigerant expansion valve, characterized in that a male and female screw is formed on the upper part of the lifting groove (32) between the support body and the needle housing. In claim 5,
The rotation guide 21a in the transverse direction is formed inside the valve block, and guide wings 21b are formed on the upper part of the needle housing, so that the rotation guide 21a and the needle housing are operated by the actuator. A refrigerant expansion valve, wherein the needle housing and the needle can move up and down by a screw formed between the support body (30) and the support body (30) while rotating. In claim 5,
A refrigerant expansion valve, characterized in that a coil spring (44a) is installed in the lifting body (42), which is inserted into the outer periphery of the needle (40) and presses the flange (50) downward. In claim 7,
A refrigerant expansion valve, characterized in that the upper end of the coil spring (44a) is connected to the lower surface of the adjustment nut (46), which is fastened to the outer peripheral surface of the needle (40) and whose height is adjusted. In claim 8,
When the needle 40 rises, the elevating body 42 and the flange 50 rise by the adjustment nut, and the passage between the flange 50 and the bottom opening 22a is opened and bypassed. A refrigerant expansion valve characterized in that a flow path is formed. In claim 1,
A refrigerant expansion valve, characterized in that a packing (60) is coupled to the lower part of the flange (50) so as to make surface contact with the edge of the bottom opening (22a) when the flange (50) is lowered. In claim 10,
The packing 60 is supported by a fastening nut, and the packing 60 includes a lower packing part 60a that opens and closes the bottom opening, and an upper packing part 60b supported by the fastening nut. valve.