JP2006002798A - Closing valve for refrigerant - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a closing valve for refrigerant capable of reducing the pressure loss of the refrigerant. <P>SOLUTION: The closing valve 100 for refrigerant includes a body part 1 and a valve element 2, wherein the body part 1 is furnished with a first refrigerant passage 21, a second refrigerant passage 22, an intermediate flow passage 25 to put the first 21 and the second refrigerant passage 22 in communication to each other, and a valve passage 24 to be in communication with the intermediate flow passage 25. The valve element 2 is inserted into the valve passage 24 movably in the axial direction, and moves in the first direction from the side with the valve passage 24 toward the intermediate flow passage 25 so as to shut the communication between the two refrigerant passages 21 and 22, and moves in the second direction from the side with the intermediate flow passage 25 toward the valve passage 24 so as to open the communication between them. The valve element 2 has a recess 31 recessed from the forefront face facing the intermediate flow passage 25 to the second direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a refrigerant closing valve.

Conventionally, a refrigerant shut-off valve for sealing a refrigerant is used in refrigerant equipment such as an air conditioner and a refrigerator. Some of the refrigerant closing valves include a main body having therein a refrigerant flow path through which the refrigerant flows, and a valve body that moves so as to approach and retreat with respect to the refrigerant flow path. In such a refrigerant closing valve, when the refrigerant flow path is closed, the valve body moves in a direction approaching the refrigerant flow path, and the valve body blocks the refrigerant flow path. Moreover, when opening a refrigerant | coolant flow path, the refrigerant | coolant flow path interrupted | blocked by the valve body is open | released by moving to the direction which a valve body retreats with respect to a refrigerant | coolant flow path.
Japanese Patent Laid-Open No. 9-138037 (FIG. 1)

The refrigerant shut-off valve as described above is closed when it is necessary to seal the refrigerant at the time of transfer or maintenance of the refrigerant equipment, but is normally opened so that the refrigerant circulates in the refrigerant equipment. ing. In a state in which the refrigerant shut-off valve is opened, the refrigerant flows through the refrigerant flow path, but the pressure loss of the refrigerant occurs due to the valve body affecting the flow of the refrigerant.
The subject of this invention is providing the closing valve for refrigerant | coolants which can reduce the pressure loss of a refrigerant | coolant.

  The refrigerant shutoff valve according to the first invention includes a main body and a valve body. The main body includes therein a first refrigerant channel, a second refrigerant channel, an intermediate channel that communicates the first refrigerant channel and the second refrigerant channel, and a valve channel that communicates with the intermediate channel. Have. The valve body is inserted into the valve passage so as to be movable in the axial direction, and moves between the first coolant passage and the second coolant passage by moving in the first direction from the valve passage toward the intermediate passage. Then, the gap between the first refrigerant channel and the second refrigerant channel is opened by moving in the second direction from the intermediate channel side toward the valve channel side. And a valve body has a recessed part dented in the 2nd direction from the front end surface which faces an intermediate flow path.

In this refrigerant closing valve, the tip of the valve body has a shape recessed in the second direction from the tip surface facing the intermediate flow path. For this reason, the influence which a valve body has on the flow of a refrigerant | coolant is reduced, and the pressure loss of the refrigerant | coolant by a valve body can be reduced.
The refrigerant shutoff valve according to the second aspect of the present invention is the refrigerant shutoff valve of the first aspect, wherein the first refrigerant flow path and the second refrigerant flow path are bent at a predetermined angle. . Further, the second refrigerant flow path and the valve passage are arranged coaxially with the intermediate flow path interposed therebetween. And a main-body part has a valve seat. The valve seat is located at the boundary between the intermediate flow path and the second refrigerant flow path 22 and is a portion where the tip of the valve body abuts and separates.

  In this refrigerant shut-off valve, when the valve body moves in the first direction, the valve body abuts on the valve seat and the boundary between the intermediate flow path and the valve passage is closed. Thereby, between the 1st refrigerant | coolant flow path 21 and the 2nd refrigerant | coolant flow path 22 is interrupted | blocked, and the flow of a refrigerant | coolant can be interrupted | blocked. Further, when the valve body moves in the second direction, the valve body that is in contact with the valve seat is separated from the valve seat, and the boundary between the intermediate flow path and the valve passage is opened. Thereby, between the 1st refrigerant | coolant flow path 21 and the 2nd refrigerant | coolant flow path 22 is open | released, and the flow of a refrigerant | coolant can be open | released.

The refrigerant shutoff valve according to the third aspect of the present invention is the refrigerant shutoff valve of the first or second aspect of the present invention, wherein the recess forms a cylindrical space inside.
In the refrigerant shut-off valve, the pressure loss of the refrigerant can be further reduced because the recess has a shape that forms a cylindrical space inside.
The refrigerant shut-off valve according to a fourth aspect of the present invention is the refrigerant shut-off valve of the first or second aspect, wherein the recess is formed from the first recess recessed in the second direction from the front end surface, and the bottom surface of the first recess. And a second recess recessed in the second direction.

In this refrigerant closing valve, the concave portion has the first concave portion and the second concave portion, and has a shape that is recessed in a plurality of stages from the front end surface, whereby the pressure loss of the refrigerant can be further reduced.
A refrigerant shutoff valve according to a fifth aspect of the present invention is the refrigerant shutoff valve of the fourth aspect, wherein the first concave portion forms a cylindrical first space therein, and the second concave portion is cylindrical inside thereof. A second space having a shape is formed. The second space has a smaller diameter than the first space.

In this refrigerant shut-off valve, the pressure loss of the refrigerant can be further reduced because the second space of the second recess has a smaller diameter than the first space of the first recess.
A refrigerant shutoff valve according to a sixth aspect of the present invention is the refrigerant shutoff valve of the fourth aspect, wherein the first recess forms a cylindrical first space. The second recess has a curved shape that is recessed in the second direction from the bottom surface of the first recess.

In this refrigerant shut-off valve, the shape of the second recess located on the second direction side among the shapes recessed in a plurality of stages is a curved surface. In this refrigerant shut-off valve, the pressure loss of the refrigerant can be further reduced because the recess has such a shape.
A refrigerant shutoff valve according to a seventh aspect of the present invention is the refrigerant shutoff valve of the first aspect or the second aspect, wherein the recess forms a frustoconical space whose diameter increases in the first direction. .

In this refrigerant shut-off valve, the concave portion has a shape that forms a frustoconical space that expands in the first direction in the interior thereof, whereby the pressure loss of the refrigerant can be further reduced.
The refrigerant shutoff valve according to an eighth aspect of the present invention is the refrigerant shutoff valve of the first aspect or the second aspect, wherein the bottom surface of the recess has a curved shape recessed in the second direction.

In this refrigerant shut-off valve, the bottom surface of the recess has a curved shape that is recessed in the second direction, so that the pressure loss of the refrigerant can be further reduced.
The refrigerant shut-off valve according to a ninth aspect of the present invention is the refrigerant shut-off valve according to the first or second aspect of the present invention, wherein the recess forms therein a conical space whose diameter increases in the first direction.
In this refrigerant shut-off valve, the recess has a shape in which a conical space whose diameter increases in the first direction is formed therein, whereby the pressure loss of the refrigerant can be further reduced.

In the refrigerant shutoff valve according to the first aspect of the invention, the distal end portion of the valve body is recessed in the second direction from the distal end surface facing the intermediate flow path. For this reason, the influence which a valve body has on the flow of a refrigerant | coolant is reduced, and the pressure loss of the refrigerant | coolant by a valve body can be reduced.
In the refrigerant shutoff valve according to the second aspect of the invention, when the valve body moves in the first direction, the valve body abuts on the valve seat and the boundary between the intermediate flow path and the valve passage is closed, thereby reducing the flow of the refrigerant. Can be blocked. Further, when the valve body moves in the second direction, the valve body is separated from the valve seat and the boundary between the intermediate flow path and the valve passage is opened, so that the refrigerant flow can be released.

In the refrigerant shutoff valve according to the third aspect of the invention, the pressure loss of the refrigerant can be further reduced because the concave portion has a shape that forms a cylindrical space inside.
In the refrigerant shutoff valve according to the fourth aspect of the present invention, the pressure loss of the refrigerant can be further reduced because the concave portion has a shape recessed in a plurality of stages from the front end surface.
In the refrigerant shutoff valve according to the fifth aspect of the present invention, the second space of the second recess has a smaller diameter than the first space of the first recess, so that the pressure loss of the refrigerant can be further reduced.

In the refrigerant shut-off valve according to the sixth aspect of the invention, among the shapes recessed in a plurality of stages, the shape of the second concave portion located on the second direction side is a curved surface, thereby further reducing the pressure loss of the refrigerant. Can do.
In the refrigerant shutoff valve according to the seventh aspect of the present invention, the pressure loss of the refrigerant can be further reduced by forming a truncated cone-shaped space in which the concave portion expands in the first direction.

In the refrigerant shutoff valve according to the eighth aspect of the present invention, the pressure loss of the refrigerant can be further reduced by having a curved surface shape in which the bottom surface of the recess is recessed in the second direction.
In the refrigerant shutoff valve according to the ninth aspect of the present invention, the recess has a shape that forms a conical space that expands in the first direction in the interior thereof, thereby further reducing the pressure loss of the refrigerant. Can do.

<Overall configuration>
FIG. 1 shows a cross-sectional view of a refrigerant closing valve 100 according to an embodiment of the present invention. The refrigerant closing valve 100 is a closing valve provided in an outdoor unit of an air conditioner (not shown) including an indoor unit, an outdoor unit, and a communication pipe that connects the indoor unit and the outdoor unit. , Valve body 2, seal cap 3, valve core 4, valve core cap 5, and nut 7.

  The main body 1 has a first cylindrical part 1a, a second cylindrical part 1b, a third cylindrical part 1c, and a fourth cylindrical part 1d. Each cylindrical portion 1a-1d has a substantially cylindrical shape with a through hole provided therein, and one end thereof is connected so that the inner peripheral surfaces of the through holes are continuous with each other. A first connection port 11 to which a communication pipe is connected is provided at the other end of the first cylindrical portion 1a. A second connection port 12 to which an internal pipe in the outdoor unit is connected is provided at the other end of the second cylindrical portion 1b. A service port 14 to which a hose from a vacuum pump (not shown) is connected is provided at the other end of the third cylindrical portion 1c. An operation port 15 into which a wrench for moving the valve body 2 is inserted is provided at the other end of the fourth cylindrical portion 1d. The second cylindrical part 1b forms an angle of about 90 degrees with respect to the first cylindrical part 1a. The third cylindrical portion 1c forms an angle of about 90 degrees with respect to the second cylindrical portion 1b, and is arranged side by side with the first cylindrical portion 1a. The fourth cylindrical portion forms an angle of about 90 degrees with the first cylindrical portion 1a and the third cylindrical portion 1c, and is arranged side by side with the second cylindrical portion 1b. A first refrigerant channel 21 is provided inside the first cylindrical part 1a, and a second refrigerant channel 22 is provided inside the second cylindrical part 1b. A valve core passage 23 is provided inside the third cylindrical portion 1c, and a valve passage 24 is provided inside the fourth cylindrical portion 1d. The first refrigerant passage 21, the second refrigerant passage 22, the valve core passage 23 and the valve passage 24 are arranged radially in four directions around the intermediate passage 25 and communicate with the intermediate passage 25. . The first refrigerant flow path 21 and the valve core passage 23 are arranged coaxially with the intermediate flow path 25 interposed therebetween, and the second refrigerant flow path 22 and the valve passage 24 are arranged coaxially with the intermediate flow path 25 interposed therebetween. Yes. Since the valve core passage 23 is closed by the valve core 4 and the valve passage 24 is closed by the valve body 2, the first refrigerant passage 21, the intermediate passage 25, and the second refrigerant passage 22 are refrigerant passages through which refrigerant flows. 26 is formed. For this reason, the refrigerant flow path 26 has an L-shape bent at 90 degrees in the middle. Hereinafter, the direction from the valve passage 24 toward the second refrigerant passage 22 among the directions parallel to the axis passing through the second refrigerant passage 22 and the valve passage 24 is referred to as a first direction (see arrow A1 in FIG. 1). The direction from the second refrigerant flow path 22 toward the valve passage 24 is referred to as a second direction (see arrow A2 in FIG. 2). At the boundary between the intermediate flow path 25 and the second refrigerant flow path 22 is provided a valve seat 10 with which the tip of the valve body 2 comes into contact with and separates from, and the valve seat 10 is increased in diameter in the second direction. It has a tapered shape.

  The valve body 2 has a substantially columnar shape, and is disposed in the valve passage 24 of the fourth cylindrical portion 1d so as to be movable in the axial direction. The distal end of the valve body 2 faces the intermediate flow path 25 and has a tapered shape that decreases in diameter in the first direction. A hexagonal hole (not shown) into which a hexagonal wrench is inserted is formed at the rear end of the valve body 2, and the valve body 2 is moved in the axial direction by rotating the valve body 2 together with the hexagonal wrench. Can be moved. As shown in FIG. 1, in the open state where the refrigerant flow path 26 is opened, the tip of the valve body 2 slightly protrudes from the valve passage 24 to the intermediate flow path 25. In this state, the tip of the valve body 2 and the second refrigerant flow path 22 are open, and the intermediate flow path 25 is open. As shown in FIG. 2, in the closed state in which the refrigerant flow path 26 is closed, the tip of the valve body 2 is in contact with the valve seat 10. In this state, the tip of the valve body 2 and the second refrigerant flow path 22 are closed without a gap, and the intermediate flow path 25 is closed. When closing the coolant closing valve 100, the valve body 2 is moved in the first direction so that the tip of the valve body 2 and the valve seat 10 are brought into contact with each other. The flow path 22 is blocked. Further, when the refrigerant closing valve 100 is opened, the valve body 2 is moved in the second direction so that the tip of the valve body 2 is separated from the valve seat 10, and the first refrigerant flow path 21 and the second refrigerant flow path 22 are moved. To communicate with. Although the recessed part for reducing the pressure loss of a refrigerant | coolant is provided in the front-end | tip of the valve body 2, a recessed part is explained in full detail behind. An annular groove 2b is formed on the outer periphery of the valve body 2, and an O-ring 6 is fitted on the groove 2b. Thereby, the space between the inner peripheral surface of the valve passage 24 and the outer peripheral surface of the valve body 2 is sealed, so that the refrigerant does not leak to the outside.

The seal cap 3 is normally attached to the other end of the fourth cylindrical portion 1d and closes the operation port 15. When the refrigerant closing valve 100 is opened and closed, it is removed from the other end of the fourth cylindrical portion 1d. The seal cap 3 and the main body 1 are sealed with a seal member.
The valve core 4 is inserted into the valve core passage 23 and closes the valve core passage 23. When the hose from the vacuum pump is connected to the valve core 4, the valve core 4 is opened, and the connection pipe connected to the first connection port 11 through the service port 14 and the first connection port 11 is evacuated.

The valve core cap 5 is normally attached to the other end of the third cylindrical portion 1 c and closes the service port 14. The valve core cap 5 is removed from the other end of the third cylindrical portion 1c when evacuating the communication pipe. The space between the inner peripheral screw 18 of the valve core cap 5 and the inner peripheral screw 17 of the third cylindrical portion 1c is sealed.
The nut 7 has a screw 19 that is screwed with a screw 16 formed on the outer periphery of the first connection port 11 on the inner periphery, and connects the first connection port 11 and the connection pipe.

<Recessed shape>
As described above, the recesses 31-35 and 40 that are recessed from the distal end surface 30 of the valve body 2 in the second direction are provided at the distal end of the valve body 2. As specific shapes of the recesses 31-35 and 40, five types of shapes from shape (1) to shape (5) are given below.
[Shape (1)]
As shown in FIG. 3, the concave portion 31 forms a cylindrical space disposed coaxially with the axis of the valve body 2. The diameter of the valve body 2 is d1, the diameter of the distal end surface 30 of the valve body 2 is d2 (d1> d2), the diameter of the first refrigerant channel 21 is d3 (see FIG. 1), and the diameter of the space formed by the recess 31 is set. When L1, the depth of the recess 31, that is, the height of the space formed by the recess 31, is W1, the following two conditions are satisfied simultaneously.

d1 × 0.2 <L1 <d1 × 0.8
d3 × 0.1 <W1 <d3 × 1
FIG. 3B is a diagram of FIG. 3A viewed from the axial direction.
[Shape (2)]
As shown in FIG. 4, the recess 32 includes a first recess 36 that is recessed in the second direction from the tip surface 30, and a second recess 37 that is recessed in the second direction from the bottom surface of the first recess 36. . The concave portion 32 forms a space in which the diameter gradually decreases in the second direction, and in this shape, the concave portion 32 has a concave shape in two steps. The 1st recessed part 36 forms the cylindrical 1st space arrange | positioned coaxially with the axis | shaft of the valve body 2 in the inside. The 2nd recessed part 37 forms the cylindrical 2nd space arrange | positioned coaxially with the axis | shaft of the valve body 2 in the inside. The second space has a smaller diameter than the first space. The diameter of the first space is L3, the diameter of the second space is L4 (L3> L4), the depth from the tip surface 30 to the bottom surface of the second space, that is, the height of the cylindrical shape of the first space and the cylindrical shape of the second space. When the total height of W2 is W2 and the depth from the tip surface 30 to the bottom surface of the first space, that is, the height of the cylindrical shape of the first space is W3, the following conditions are simultaneously satisfied.

d1 × 0.2 <L3 <d1 × 0.8
d3 × 0.1 <W2 <d3 × 1
L3 × 0.2 <L4 <L3 × 0.8
W2 × 0.1 <W3 <W2 × 0.8
FIG. 4B is a view of FIG. 4A viewed from the axial direction.

[Shape (3)]
As shown in FIG. 5, the recess 33 has a first recess 38 that is recessed in the second direction from the tip surface 30, and a second recess 39 that is recessed in the second direction from the bottom surface of the first recess 38. . The concave portion 33 has a space in which the diameter is gradually reduced in the second direction, and in this shape, the concave portion has a two-step concave shape. The 1st recessed part 38 forms the cylindrical 1st space arrange | positioned coaxially with the axis | shaft of the valve body 2 in the inside. The second recess 39 has a curved shape that is recessed in a semi-elliptical shape in the second direction from the bottom surface of the first recess 38. The 2nd space which the 2nd crevice 39 forms in the inside has the circle shape arranged coaxially with the axis of valve body 2 in the axial section. Further, the diameter L6 in the axial cross section of the second space is smaller than the diameter L5 of the first space.

FIG. 5B is a diagram of FIG. 5A viewed from the axial direction.
[Shape (4)]
As shown in FIG. 6, the recess 34 forms a frustoconical space disposed coaxially with the axis of the valve body 2. The frustoconical shape expands in the first direction, and the diameter L7 of the bottom surface on the first direction side of the frustoconical shape is smaller than the diameter L8 of the bottom surface on the second direction side.

FIG. 6B is a diagram of FIG. 6A viewed from the axial direction.
[Shape (5)]
As shown in FIG. 7, the recess 35 forms a cylindrical space disposed coaxially with the axis of the valve body 2, and the bottom surface of the recess 35 has a curved shape recessed in the second direction. .
FIG. 7B is a view of FIG. 7A viewed from the axial direction.

[Shape (6)]
As shown in FIG. 8, the recessed part 40 forms the space of the cone shape arrange | positioned coaxially with the axis | shaft of the valve body 2 in the inside. The conical shape increases in diameter in the first direction.
FIG. 8B is a view of FIG. 8A viewed from the axial direction.
<Features>
In the refrigerant shut-off valve 100, the outdoor unit and the indoor unit are separated by closing the refrigerant flow path 26 at the time of transfer or maintenance of the air conditioner and removing the connecting pipe from the first connection port 11 of the main body 1. Can be in a state. During normal times, the refrigerant flow path 26 can be opened, and the pressure loss of the refrigerant flowing through the refrigerant flow path 26 can be reduced by forming the valve body 2 as described above. it can.

Further, since the pressure loss of the refrigerant flowing through the refrigerant flow path 26 can be reduced by the shape of the valve body 2, the Cv value (flow coefficient) can be improved without widening the refrigerant flow path 26. Thereby, size reduction of the refrigerant | coolant closing valve 100 is possible.
Furthermore, since the Cv value can be improved without changing the shape of the main body 1, an existing mold for manufacturing the main body 1 can be used, and the cost can be reduced.

<Other embodiments>
(1)
In the above-described embodiment, the refrigerant shutoff valve 100 connected to the connecting pipe that connects the indoor unit and the outdoor unit of the air conditioner has been described. However, the refrigerant shutoff valve 100 according to the present invention is used for another refrigerator. May be.

(2)
In the above embodiment, the refrigerant flow path 26 has a shape bent at 90 degrees, but the refrigerant flow path 26 may have a linear shape.

  The present invention has an effect of reducing the pressure loss of the refrigerant and is useful as a refrigerant closing valve.

Sectional drawing (open state) of the closing valve for refrigerant | coolants. Cross section of refrigerant shutoff valve (closed state) The figure which shows the shape of the recessed part concerning a shape (1). The figure which shows the shape of the recessed part concerning a shape (2). The figure which shows the shape of the recessed part concerning a shape (3). The figure which shows the shape of the recessed part concerning a shape (4). The figure which shows the shape of the recessed part concerning a shape (5). The figure which shows the shape of the recessed part concerning a shape (6).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main-body part 2 Valve body 10 Valve seat 21 1st refrigerant | coolant flow path 22 2nd refrigerant | coolant flow path 24 Valve path 25 Intermediate | middle flow path 31-35,40 Recess 36,38 1st recessed part 37,39 2nd recessed part 100 Closure for refrigerant | coolants valve

Claims (9)

A first refrigerant channel (21), a second refrigerant channel (22), an intermediate channel (25) communicating the first refrigerant channel (21) and the second refrigerant channel (22); A main body (1) having a valve passage (24) communicating with the intermediate flow path (25) inside,
The first refrigerant flow path (21) is inserted into the valve passage (24) so as to be movable in the axial direction and moves in the first direction from the valve passage (24) side toward the intermediate flow path (25) side. ) And the second refrigerant flow path (22), and the first refrigerant flow path is moved in the second direction from the intermediate flow path (25) side toward the valve passage (24) side. A valve element (2) that opens between (21) and the second refrigerant flow path (22);
With
The valve body (2) has recesses (31-35, 40) recessed in the second direction from the tip surface (30) facing the intermediate flow path (25).
Refrigerant closing valve (100). The first refrigerant channel (21) and the second refrigerant channel (22) are arranged to bend at a predetermined angle,
The second refrigerant flow path (22) and the valve passage (24) are arranged coaxially with the intermediate flow path (25) in between,
The main body (1) is located at the boundary between the intermediate flow path (25) and the second refrigerant flow path (22), and the valve seat (10) with which the tip of the valve body (2) abuts and separates. Having
The refrigerant shutoff valve (100) according to claim 1. The concave portion (31) forms a cylindrical space therein.
The refrigerant closing valve (100) according to claim 1 or 2. The recesses (32, 33) include a first recess (36, 38) that is recessed in the second direction from the tip surface (30), and a bottom surface of the first recess (36, 38) in the second direction. Having a recessed second recess (37, 39),
The refrigerant closing valve (100) according to claim 1 or 2. The first recess (36) forms a cylindrical first space therein,
The second recess (37) forms a cylindrical second space therein,
The second space has a smaller diameter than the first space,
The refrigerant shutoff valve (100) according to claim 4. The first recess (38) forms a cylindrical first space,
The second recess (39) has a curved shape that is recessed in the second direction from the bottom surface of the first recess (38).
The refrigerant shutoff valve (100) according to claim 4. The concave portion (34) forms a frustoconical space that expands in diameter in the first direction.
The refrigerant closing valve (100) according to claim 1 or 2. The bottom surface of the recess (35) has a curved shape recessed in the second direction.
The refrigerant closing valve (100) according to claim 1 or 2. The concave portion (40) forms a conical space in the inside thereof whose diameter increases in the first direction.
The refrigerant closing valve (100) according to claim 1 or 2.

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