JP2022000592A - Electrically operated valve and refrigeration cycle system - Google Patents

Abstract

To provide an electrically operated valve capable of reducing fluid flow noise regardless of in which direction fluid is caused to flow, and a refrigeration cycle system using the electrically operated valve.SOLUTION: An electrically operated valve includes: a first pipe joint attached to a side surface of a valve body 30; a valve seat member provided either as a part of the valve body or as a separate part from the valve body and having a valve port 70 formed therein; and a second pipe joint 15 in communication with the first pipe joint through the valve port. The valve port includes: a first port 70a located closest to the valve element; a first tapered section 70b having an inner peripheral diameter increasing from the first port toward the second pipe joint; and a second port 70c formed on the second pipe joint side of the first tapered section. A cylindrical straightening section 80 for straightening the flow of fluid is disposed or formed either inside the second pipe joint or between the valve port and the second pipe joint.SELECTED DRAWING: Figure 2

Description

The present invention relates to a motorized valve and a refrigeration cycle system using the motorized valve.

Conventionally, in the refrigeration cycle, noise caused by fluid passage generated from an electric valve that controls the flow rate of fluid may be a problem. As an electric valve that suppresses such noise, as shown in FIGS. 15 and 16, an electric valve having a valve port 120 having a long second port 120c as a rectifying portion below the first port 120a which is an orifice. 100 are known (see, for example, Patent Document 1).

In this motorized valve 100, as shown in FIG. 16, the fluid squeezed in the gap between the valve body 114 and the first port 120a flows along the second port 120c following the tapered portion 120b, and flows along the second port 120c. It is rectified at 120c. Further, by providing the long second port 120c, the cavitation burst is suppressed without suddenly recovering the pressure of the fluid, so that the passing noise of the fluid is reduced.

Japanese Unexamined Patent Publication No. 2013-234726

However, in the above-mentioned electric valve 100, the passing sound of the fluid when the fluid is flowed from the first pipe joint 111 to the second pipe joint 112 (hereinafter referred to as a positive direction) is improved, but the fluid Was flown from the second pipe joint 112 in the direction of the first pipe joint 111 (hereinafter, referred to as a reverse direction), there was a case where the effect did not occur.

Specifically, in FIG. 16, when the fluid flows in the opposite direction, the flow velocity of the fluid reaches the first port 120a without decelerating, so that the flow velocity of the fluid in the first port 120a causes the fluid to flow in the forward direction. It will be larger than the flow velocity when flowing. Then, since the pressure of the fluid is rapidly recovered after being throttled at the first port 120a, the cavitation bursts remarkably and the passing sound of the fluid becomes loud.

For this reason, in the past, measures such as limiting the flow direction of the fluid to the positive direction were taken in order to suppress the passing noise of the fluid. It is expected that it can be used without any problem even if the fluid is flowed in the opposite direction.

An object of the present invention is to provide an electric valve capable of reducing the passing noise of a fluid regardless of the direction in which the fluid flows, and a refrigeration cycle system using the electric valve.

The electric valve of the present invention is
The rotary motion of the rotor housed in the inner circumference of the case is converted into a linear motion by screwing the male screw member and the female screw member, and the valve body housed in the valve body is used as the axis based on this linear motion. It is an electric valve that moves in the direction.
The first pipe fitting mounted on the side surface of the valve body and
A valve seat member provided as a part of the valve body or as a separate part from the valve body and formed with a valve port.
A second pipe fitting communicating with the first pipe joint via the valve port is provided.
The valve port includes a first port located closest to the valve body, a first tapered portion whose inner peripheral diameter is widened from the first port toward the second pipe joint, and the first tapered portion of the first tapered portion. 2 Including the second port formed on the pipe joint side,
It is characterized in that a cylindrical rectifying portion for rectifying a fluid is arranged or formed inside the second pipe joint or between the valve port and the second pipe joint.

In this way, by providing the first taper portion and the second port in the valve port, when the fluid flows in the positive direction, the flow throttled by the first port is rectified, and the pressure is rapidly recovered. Since it can be prevented, the cavitation burst can be suppressed. In addition, by arranging a substantially cylindrical rectifying section inside the second pipe joint, valve vibration and cavitation can be prevented by preventing the fluid from directly hitting the first port when the fluid flows in the opposite direction. It is possible to suppress the generation of sounds such as bursting.

Therefore, it is possible to reduce the passing sound of the fluid regardless of whether the fluid is flowed in the forward direction or the reverse direction.

Further, the electric valve of the present invention is
The end portion of the rectifying portion on the valve body side is in contact with the valve seat member.

As a result, the gap between the rectifying section and the valve port can be eliminated, and the fluid flowing from the rectifying section to the valve port or from the valve port to the rectifying section does not come into direct contact with the inside of the second pipe joint. The passing sound of the fluid can be suppressed more reliably.

Further, the electric valve of the present invention is
The inner peripheral diameter of the rectifying unit is wider than the inner peripheral diameter of the first port.

This makes it possible to suppress the pressure loss caused by the rectifying unit when the fluid flows in the positive direction.

Further, the electric valve of the present invention is
The length of the rectifying unit in the axial direction is longer than the length of the first port in the axial direction.

As described above, when the rectifying unit has a length of a certain length or more, the fluid can be accurately rectified.

Further, the electric valve of the present invention is
The rectifying unit is further arranged inside the first pipe joint or between the valve body and the first pipe joint.

As a result, when the fluid flows in the positive direction, the fluid discharged from the first pipe joint into the valve chamber is prevented from being rapidly expanded and disturbed, so that the passing sound of the fluid can be suppressed more accurately. Can be done.

Further, the electric valve of the present invention is
The rectifying unit
A second pipe joint is provided with an extension portion that is extended by reducing the inner peripheral diameter and the outer peripheral diameter at the end portion connected to the valve port and is inserted into the inside of the valve port. ..

As a result, the distance from the first port to the upper end of the rectifying portion (the upper end of the extending portion) can be shortened. Therefore, it is possible to prevent the fluid rectified in the rectifying unit from diffusing again in the third port and forming a turbulent flow, and it is possible to prevent the rectifying effect produced by the rectifying unit from being impaired.

Further, the electric valve of the present invention is
The valve port has a second tapered portion whose inner peripheral diameter is further widened from the second port toward the second pipe joint, and a third port formed on the second pipe joint side of the second tapered portion. It is characterized by including and.

In this way, by further providing the valve port with a taper and a port, it is possible to more accurately suppress the passing noise of the fluid. Further, even when the fluid flows in the opposite direction, the fluid passing through the rectifying section is once decelerated at the port, so that the passing sound of the fluid can be accurately reduced.

Further, the electric valve of the present invention is
The valve port further widens the inner peripheral diameter while continuously increasing the tapered portion and the port from the third port toward the second pipe joint, and the n-th tapered portion and the n-th tapered portion of the n-th tapered portion. 2 Including the n + 1 port formed on the pipe joint side, including
The value of n is 10 or less.

Further, the refrigeration cycle system of the present invention is used.
A refrigeration cycle system including a compressor, a condenser, an expansion valve, an evaporator, and the like, characterized in that the above-mentioned electric valve is used as the expansion valve.

According to the present invention, it is possible to provide an electric valve capable of reducing the passing noise of the fluid regardless of the direction in which the fluid flows, and a refrigeration cycle system using the electric valve.

It is the schematic sectional drawing of the electric valve which concerns on embodiment. It is an enlarged view of the main part of the electric valve which concerns on embodiment. It is a figure which shows the case where the rectifying part is further provided in the 1st pipe joint in the electric valve which concerns on embodiment. It is a figure which shows the case where the inner peripheral diameter of a rectifying part is wider than the inner peripheral diameter of a 2nd port in the electric valve which concerns on embodiment. It is a figure which shows the case where the constriction part which crimps the straightening part is formed in the 2nd pipe joint in the electric valve which concerns on embodiment. It is a figure which shows the case where a plurality of recesses for crimping a straightening part are formed in the 2nd pipe joint in the electric valve which concerns on embodiment. It is a figure which shows the case where the straightening part is brazed and fixed in the 2nd pipe joint in the electric valve which concerns on embodiment. It is a figure which shows the case which the valve main body and the inside of the 2nd pipe joint are connected with the rectifying member in the electric valve which concerns on embodiment. It is a figure which shows the case where the straightening part is integrally formed with the pipe joint in the electric valve which concerns on embodiment. It is a figure which shows the case where the valve port has only the 1st port, the 1st taper part, and the 2nd port in the electric valve which concerns on embodiment. It is a figure which shows the case where the valve port has only the 1st port, the 1st taper part, and the 2nd port in the electric valve which concerns on embodiment. It is an enlarged view of the main part in the case of using the 2nd pipe joint of the type which the diameter of the upper end part is different in the electric valve which concerns on embodiment. It is an enlarged view of the main part in the case of bending the 2nd pipe joint of the type which the diameter of the upper end part is different in the electric valve which concerns on embodiment. FIG. 5 is an enlarged view of a main part when a second pipe joint of a type having a different diameter at the upper end of the electric valve according to the embodiment is connected to a valve seat member which is a separate member from the valve body. It is a schematic sectional drawing of the conventional electric valve. It is an enlarged view of the main part of the conventional electric valve.

Hereinafter, the electric valve according to the embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing the electric valve 2 according to the embodiment. In addition, in this specification, "upper" or "lower" is defined in the state of FIG. That is, the rotor 4 is located above the valve body 17.

In the electric valve 2, the valve body 30 is integrally connected to the lower side of the opening side of the case 60 having a cylindrical cup shape made of metal by welding or the like.

Here, the valve body 30 is made of a metal such as stainless steel, and has a valve chamber 11 inside. Further, a first pipe joint 12 that directly communicates with the valve chamber 11 is fixedly mounted on the side surface of the valve body 30, and a first pipe joint 12 that communicates directly with the valve chamber 11 below the valve body 30. The two pipe joints 15 are fixedly mounted. The first pipe joint 12 and the second pipe joint 15 are made of a metal such as stainless steel or copper.

A valve port 70 is formed in a lower portion of the valve body 30, and this portion has a function as a valve seat member. The valve port 70 will be described in detail later.

A rotatable rotor 4 is housed in the inner circumference of the case 60, and a valve shaft 41 is arranged in a shaft core portion of the rotor 4 via a bush member (not shown). The rotor 4 is formed by containing a magnetic material or a magnetic material. Both the bush member and the valve shaft 41 are made of a metal such as stainless steel, and the valve shaft 41 and the rotor 4 connected by the bush member move integrally in the vertical direction while rotating. A male screw 41a is formed on the outer peripheral surface of the valve shaft 41 near the middle portion. In this embodiment, the valve shaft 41 functions as a male screw member.

A stator composed of a yoke, a bobbin, a coil, and the like (not shown) is arranged on the outer periphery of the case 60, and a stepping motor is configured by the rotor 4 and the stator.

Below the valve shaft 41, a valve shaft holder 6 having a screw feed mechanism A with the valve shaft 41 and a function of suppressing the inclination of the valve shaft 41 is provided with respect to the valve body 30 as described later. It is fixed so that it cannot rotate relatively.

The valve shaft holder 6 has a tubular portion 6a in which a female screw 6d described later is formed on the upper inner circumference, a fitting portion 6c housed on the inner peripheral portion side of the valve body 30, and a substantially ring-shaped flange. It is composed of a part 6f. The flange portion 6f of the valve shaft holder 6 is fixed to the upper end of the valve body 30 by welding or the like. Further, inside the valve shaft holder 6, a storage chamber 6h for accommodating a valve guide 18 described later is formed. The valve shaft holder 6 is made of a resin material except for the metal flange portion 6f.

Further, a female screw 6d is formed downward from the upper opening 6g of the tubular portion 6a of the valve shaft holder 6 to a predetermined depth. Therefore, in the present embodiment, the valve shaft holder 6 functions as a female screw member. The screw feed mechanism A is composed of a male screw 41a formed on the outer periphery of the valve shaft 41 and a female screw 6d formed on the inner circumference of the tubular portion 6a of the valve shaft holder 6.

Further, a pressure equalizing hole 51 is formed in the side surface of the tubular portion 6a of the valve shaft holder 6, and the pressure equalizing hole 51 allows the valve shaft holder chamber 83 in the valve shaft holder 6 and the rotor accommodating chamber 67 ( It communicates with the second back pressure chamber). By providing the pressure equalizing hole 51 in this way, the space for accommodating the rotor 4 of the case 60 and the space inside the valve shaft holder 6 are communicated with each other, so that the valve body 17 can be smoothly moved. ..

Further, below the valve shaft 41, a cylindrical valve guide 18 is slidably arranged with respect to the accommodating chamber 6h of the valve shaft holder 6. The ceiling portion 21 side of the valve guide 18 is bent at a substantially right angle by press molding. A through hole 18a is formed in the ceiling portion 21. Further, a flange portion 41b is further formed below the valve shaft 41.

Here, the valve shaft 41 is inserted into the through hole 18a of the valve guide 18 in a loose state so as to be rotatable with respect to the valve guide 18 and displaceable in the radial direction, and the flange portion 41b is a valve. It is arranged in the valve guide 18 so as to be rotatable with respect to the guide 18 and displaceable in the radial direction. Further, the valve shaft 41 is arranged so that the through hole 18a is inserted and the upper surface of the flange portion 41b faces the ceiling portion 21 of the valve guide 18. Since the flange portion 41b has a larger diameter than the through hole 18a of the valve guide 18, the valve shaft 41 is prevented from coming off.

Since the valve shaft 41 and the valve guide 18 can move in the radial direction to each other, the valve guide 18 and the valve guide 18 and the valve guide 18 and the valve guide 18 are not required to have a high degree of concentric mounting accuracy with respect to the arrangement position of the valve shaft holder 6 and the valve shaft 41. Concentricity with the valve body 17 can be obtained.

Next, a main part of the electric valve 2 according to the embodiment will be described. FIG. 2 is an enlarged view of a main part of the electric valve 2 according to the embodiment. As shown in FIG. 2, the valve port 70 formed in the lower portion of the valve body 30 has a shape in which the inner peripheral diameter is intermittently widened downward. That is, the valve port 70 has a first port 70a, a first tapered portion 70b, a second port 70c, a second tapered portion 70d, and a third port 70e. Further, a groove 30a for mounting the second pipe joint 15 is formed below the valve main body 30, and a rectifying unit 80 which is a member for rectifying the fluid is arranged inside the second pipe joint 15. ..

The first port 70a is a columnar space located at the uppermost position (side of the valve body 17), and the first port 70a has the narrowest inner peripheral diameter D1 among the valve ports 70. Further, the axial length L1 of the first port 70a is formed so as to be the shortest and minute length among the lengths of the respective ports and tapers included in the valve port 70.

The first tapered portion 70b is a space continuous below the first port 70a, and has a shape in which the inner peripheral diameter expands downward.

Similarly, the second port 70c is a continuous cylindrical space below the first tapered portion 70b. Further, the second tapered portion 70d is a space continuous below the second port 70c, and has a shape in which the inner peripheral diameter expands downward. The third port 70e is a columnar space continuous below the second tapered portion 70d, and has the widest inner peripheral diameter among the ports and tapers included in the valve port 70.

The rectifying portion 80 is a cylindrical component made of a metal such as stainless steel, and is arranged so that the upper end portion 80a is in contact with the lower end portion 70k of the valve body 30. Further, the inner peripheral diameter D2 of the rectifying unit 80 is formed so as to be wider (D1 <D2) than the inner peripheral diameter D1 of the first port 70a and narrower than the inner peripheral diameter D3 of the second port 70c. (D2 <D3). The inner diameter D4 of the third port 70e is formed to be wider than the inner diameter D2 of the rectifying unit 80 and the inner diameter D3 of the second port 70c (D2 <D4, D3 <D4). .. Further, the axial length L2 of the rectifying unit 80 is formed to be at least longer than the axial length L1 of the first port 70a (L1 <L2).

Next, a case where a fluid is flowed through the electric valve 2 according to the embodiment will be described. First, when a fluid is flowed in the positive direction from the first pipe joint 12 to the second pipe joint 15, the fluid discharged from the first pipe joint 12 is once decelerated in the valve chamber 11 and then the valve body. It flows into the gap between 17 and the first port 70a. The fluid squeezed in the gap between the valve body 17 and the first port 70a flows along the second port 70c following the first tapered portion 70b, and is rectified by the inner wall surface of the second port 70c. Further, since the inner peripheral diameter D3 of the second port 70c is wider than the inner peripheral diameter D1 of the first port 70a (D1 <D3), the fluid flowing into the second port 70c is decelerated, but the narrowest first. Since the fluid does not flow directly from the port 70a to the third port 70e having the widest inner diameter, the fluid pressure does not recover suddenly at the second port 70c. This reduces the passing noise of the fluid due to pressure.

Further, the fluid is gradually decelerated at the second tapered portion 70d forming the gradually expanding flow path, then flows along the third port 70e and is rectified again at the third port 70e. As a result, the flow velocity at the third port 70e is further reduced, and the passing noise of the fluid caused by the flow velocity is reduced. The fluid that has passed through the third port 70e is discharged to the second pipe joint 15 via the rectifying unit 80.

On the other hand, when the fluid flows in the opposite direction from the second pipe joint 15 to the first pipe joint 12, the fluid in the second pipe joint 15 is first guided to the rectifying unit 80 as shown in FIG. Be taken. Since the inner peripheral diameter D2 of the rectifying unit 80 is narrower than the inner peripheral diameter of the second pipe joint 15, the turbulence of the fluid is rectified by passing through the rectifying unit 80. This suppresses the rupture of cavitation and reduces the passing noise of the fluid.

After passing through the rectifying unit 80, the fluid is discharged to the third port 70e. Here, since the inner peripheral diameter of the third port 70e is wider than the inner peripheral diameter D2 of the rectifying unit 80, the fluid spreads and decelerates in the radial direction at the third port 70e, and the passing sound of the fluid is further reduced.

Next, the fluid is gradually rectified while passing through the second tapered portion 70d, the second port 70c, and the first tapered portion 70b, and then passes through the first port 70a. In this way, the fluid that has passed through the rectifying unit 80 is gradually rectified without directly hitting the first port 70a, so that vibration of the valve body 17 and burst of cavitation are further suppressed. The fluid that has passed through the first port 70a is discharged to the first pipe joint 12 through the valve chamber 11.

According to the electric valve 2 according to this embodiment, a plurality of tapered portions and ports are provided in the valve port 70 to suppress cavitation burst when a fluid flows in a positive direction, and the second pipe joint 15 is provided with a plurality of tapered portions and ports. By arranging a cylindrical rectifying unit 80 inside to suppress valve vibration and cavitation burst when the fluid flows in the reverse direction, the fluid can flow in either the forward direction or the reverse direction. The passing noise of the fluid can be reduced.

Further, the valve port 70 is provided with a second tapered portion 70d and a third port 70e below the first tapered portion 70b and the second port 70c, and has a shape that intermittently expands downward. Therefore, when the fluid is flowed in the positive direction, the passing sound of the fluid can be accurately suppressed. Further, when the fluid flows in the opposite direction, the fluid that has passed through the rectifying unit 80 is once decelerated at the third port 70e, so that the passing noise of the fluid can be accurately reduced.

Further, by bringing the upper end 80a of the rectifying unit 80 into contact with the lower end 70k of the valve body 30, it is possible to eliminate the gap between the rectifying unit 80 and the valve port 70, and the rectifying unit 80 to the valve port 70, Alternatively, since the fluid flowing from the valve port 70 to the rectifying unit 80 does not come into direct contact with the inside of the second pipe joint, the passing noise of the fluid can be suppressed more reliably.

Further, by forming the inner peripheral diameter D2 of the rectifying unit 80 wider than the inner peripheral diameter D1 of the first port 70a (D1 <D2), the pressure generated by the rectifying unit 80 when the fluid flows in the positive direction. The loss can be suppressed. Further, by forming the inner peripheral diameter D2 of the rectifying unit 80 to be narrower than the inner peripheral diameter D3 of the second port 70c (D2 <D3), the valve body is directly formed when the fluid flows in the opposite direction. The amount of fluid corresponding to 17 can be reduced. Therefore, it is possible to suppress the vibration of the valve body 17 caused by the fluid directly hitting the body 17, and suppress the noise caused by the vibration of the valve body 17.

Further, since the rectifying unit 80 has a length of a certain length or more, the fluid can be accurately rectified.

In the above-described embodiment, as shown in FIG. 3, a rectifying unit 82 may be further arranged in the first pipe joint 12. In this case, when the fluid is flowed in the positive direction, the fluid discharged from the first pipe joint 12 into the valve chamber 11 is prevented from being rapidly expanded and disturbed, so that the passing sound of the fluid can be heard more accurately. It can be suppressed.

In this case, it is preferable that the end surface 82a on the valve chamber 11 side of the rectifying unit 82 is aligned with the end surface 12a on the valve chamber 11 side of the first pipe joint 12. Further, an annular flange (not shown) protruding toward the inner peripheral diameter side of the first pipe joint 12 is provided on the end surface 12a of the first pipe joint 12, and the rectifying portion 82 is arranged so that the end surface 82a comes into contact with the flange. You may.

Further, in the above-described embodiment, as shown in FIG. 2, a case where the inner peripheral diameter D2 of the rectifying unit 80 is narrower than the inner peripheral diameter D3 of the second port 70c is described as an example (D2 <. D3), as shown in FIG. 4, the inner peripheral diameter D2 of the rectifying unit 80 may be formed wider than the inner peripheral diameter D3 of the second port 70c (D2> D3). In this case, even if a high differential pressure is generated between the valve chamber 11 and the valve port 70 when the fluid is flowed in the positive direction, the fluid is not suddenly depressurized. Therefore, the fluid can be decelerated stepwise, and the passing sound of the fluid can be suitably suppressed.

Further, in the above-described embodiment, as shown in FIG. 5, a constricted portion 91 enclosed in an annular shape may be formed in the second pipe joint 15. As a result, when the rectifying section 80 is attached to the second pipe joint 15, the rectifying section 80 can be crimped by the constricted section 91, so that the rectifying section 80 can be accurately fixed so that the position does not shift. .. Further, as shown in FIG. 6, a plurality of recesses 93 may be formed in the second pipe joint 15 to crimp the straightening part 80. This technique can also be used when the rectifying unit 80 is arranged in the first pipe joint 12.

Further, in the above-described embodiment, as shown in FIG. 7, the straightening vane 80 may be brazed and fixed to the second pipe joint 15 and the valve body 30.

Further, in the above-described embodiment, instead of arranging the rectifying unit 80 inside the second pipe joint 15, the rectifying unit may be arranged between the valve body 30 and the second pipe joint 15. For example, as shown in FIG. 8, a rectifying member 85 having cylindrical side walls 85a and 85b on the upper and lower sides and having a rectifying portion 85f having a narrow inner peripheral diameter formed between the side walls 85a and the side wall 85b is used. In this case, the side wall 85a is inserted into the groove 30a of the valve body 30, the rectifying member 85 is connected to the valve body 30, and the second pipe joint 15 is further inserted into the groove 85c formed inside the side wall 85b of the rectifying member 85. Insert and connect the second pipe joint 15 to the rectifying member 85.

In this case, the inner peripheral diameter of the side wall 85b is the same as the outer peripheral diameter of the second pipe joint 15 or larger than the outer peripheral diameter of the second pipe joint 15 so that the rectifying member 85 and the second pipe joint 15 can be accurately connected. It is preferable to form it slightly smaller.

Further, this technique may be applied to the first pipe joint 12. In this case, the rectifying member 85 is connected to the side wall of the valve body 30, and the first pipe joint 12 is further connected to the rectifying member 85.

Further, in the above-described embodiment, the case where the rectifying unit 80 is arranged in the second pipe joint 15 as an independent component is described as an example, but the rectifying unit is integrated with the second pipe joint 15. It may be molded into. For example, as shown in FIG. 9, at the upper end portion of the second pipe joint 15, the rectifying portion 86 may be formed so as to narrow the inner peripheral diameter of the second pipe joint 15. Similarly, at the end of the first pipe joint 12 on the valve chamber 11 side, the rectifying portion 88 may be formed so as to narrow the inner peripheral diameter of the first pipe joint 12.

Further, in the above-described embodiment, the case where the valve seat member is integrally incorporated in the valve body 30 is described as an example, but as shown in FIG. 9, the valve seat member having the valve port 70 is described. 33 may be arranged in the valve body 30 as an independent component.

Further, in the above-described embodiment, as shown in FIGS. 10 and 11, the valve port 70 is not provided with the second tapered portion 70d and the third port 70e, and the first port 70a, the first tapered portion 70b, and the second port are not provided. Only 70c may be provided.

In this case, when the fluid is passed in the positive direction from the first pipe joint 12 to the second pipe joint 15, the fluid squeezed by the gap between the valve body 17 and the first port 70a becomes the first tapered portion 70b. It flows along the second port 70c and is rectified by the inner wall surface of the second port 70c. Further, since the inner peripheral diameter D3 of the second port 70c is wider than the inner peripheral diameter D1 of the first port 70a (D1 <D3), the fluid flowing into the second port 70c is decelerated. This suppresses the rupture of cavitation and reduces the passing noise of the fluid. The fluid that has passed through the second port 70c is discharged to the second pipe joint 15 via the rectifying unit 80.

On the other hand, when the fluid flows in the opposite direction from the second pipe joint 15 toward the first pipe joint 12, the fluid flowing into the second pipe joint 15 first reaches the rectifying unit 80 as shown in FIG. Be guided. Since the inner peripheral diameter of the rectifying unit 80 is narrower than the inner peripheral diameter of the second pipe joint 15, the turbulence of the fluid is rectified by passing through the rectifying unit 80. This suppresses the rupture of cavitation and reduces the passing noise of the fluid.

After passing through the rectifying unit 80, the fluid is discharged to the second port 70c. Here, since the inner peripheral diameter D3 of the second port 70c is wider than the inner peripheral diameter D2 of the rectifying unit 80 (D3> D2), the fluid spreads and decelerates in the radial direction at the third port 70e, and the passing sound of the fluid is heard. Is further reduced. The fluid discharged to the second port 70c is further rectified while passing through the first tapered portion 70b, and then passes through the first port 70a. The fluid that has passed through the first port 70a is discharged to the first pipe joint 12 through the valve chamber 11.

Further, in the above-described embodiment, the second pipe joint 16 of a type having a different diameter at the upper end portion may be used. For example, as shown in FIG. 12, in the second pipe joint 16, the wall thickness of the side wall is increased by narrowing only the inner peripheral diameter at the end on the side connected to the valve port 70 while maintaining the outer peripheral diameter. The thickened portion 16a and the extended portion 16b extending upward may be provided while maintaining the inner peripheral diameter of the thickened portion 16a constant. That is, the extension portion 16b is extended in a cylindrical shape by reducing both the inner peripheral diameter and the outer peripheral diameter on the side connected to the valve port 70 of the second pipe joint 16.

In this case, the valve port 70 also has a shape to which the second pipe joint 16 can be connected. Specifically, the valve port 70 includes an annular flat surface portion 71a located on the outer peripheral side of the lower edge of the third port 70e, and a connecting portion 71b formed downward while maintaining the outer peripheral diameter of the annular flat surface portion 71a. There is.

When the second pipe joint 16 is connected to the valve body 30, the extension portion 16b is inserted into the valve port 70, and the thick portion 16a is inserted into the connection portion 71b. That is, the outer peripheral surface of the extending portion 16b abuts on the inner peripheral surface of the third port 70e, and the outer peripheral surface of the thick portion 16a abuts on the inner peripheral surface of the connecting portion 71b. Further, the upper end portion 16f of the thick portion 16a formed on the outer peripheral side of the extending portion 16b comes into contact with the annular flat surface portion 71a.

In this state, the extending portion 16b and the thick portion 16a form the rectifying portion described in the above-described embodiment.

When such a type of second pipe joint 16 having a different diameter at the upper end portion is used, at least a part of the rectifying portion is arranged in the valve port 70. Therefore, even when the length of the valve port 70 extends in the axial direction, the distance from the first port 70a to the upper end of the rectifying portion (the upper end of the extending portion 16b) can be shortened. Therefore, it is possible to prevent the fluid rectified in the rectifying section from being diffused again in the third port 70e to form a turbulent flow, and it is possible to prevent the rectifying effect produced by the rectifying section from being impaired.

Further, the second pipe joint 16 may be bent as shown in FIG. In such a case, if the rectifying portion (thick portion 16a, extending portion 16b) is located in the valve port 70, it is not necessary to lower the bent portion by the length of the rectifying portion, so that the first pipe The pitch h between the pipe joints between the joint 12 and the second pipe joint 16 does not widen. Therefore, the electric valve 2 can be made compact even when the second pipe joint 16 is bent without increasing the total height of the electric valve 2.

Further, as described above, when the second pipe joint 16 is assembled to the valve main body 30, the extension portion 16b is inserted into the valve port 70, and the thick portion 16a is inserted into the connection portion 71b. Therefore, the second pipe joint 16 can be arranged while ensuring the concentricity with respect to the valve seat, and the stability of brazing can be expected.

Further, even when the second pipe joint 16 having a different diameter at the upper end portion is used, the inner peripheral diameter D2 of the rectifying portion (thickness portion 16a, extending portion 16b) is the inner peripheral diameter of the first port 70a. It is formed to be wider than D1 (D1 <D2). Further, the inner peripheral diameter D4 of the third port 70e is formed so as to be wider than the inner peripheral diameter D2 of the rectifying section and the inner peripheral diameter D3 of the second port 70c (D2 <D4, D3 <D4). Further, the axial length L2 of the rectifying unit 80 is formed to be at least longer than the axial length L1 of the first port 70a (L1 <L2).

Further, even when the second pipe joint 16 is used, as shown in FIG. 14, the valve seat member 33 having the valve port 70 may be arranged in the valve body 30 as an independent component. Further, the rectifying portion 88 may be formed in the first pipe joint 12 regardless of whether the valve seat member 33 is an independent component.

In the above-described embodiment, the techniques described with reference to FIGS. 3 to 9 and 12 to 14 have the valve port 70, the first port 70a, the first taper portion 70b, and the second port shown in FIGS. 10 and 11. It can also be applied to an electric valve having only 70c.

Further, in the above-described embodiment, the valve port 70 may further increase the inner peripheral diameter while continuously increasing the tapered portion and the port from the third port 70e toward the second pipe joint. In this case, the third tapered portion, the fourth port, ..., The nth tapered portion, and the n + 1th port are continuously formed below the third port 70e. For example, when the value of n is 10, the valve port 70 is formed up to the tenth tapered portion and the eleventh port. The technique described with reference to FIGS. 3 to 9 and 12 to 14 may be applied to an electric valve having a valve port in which the nth taper portion and the n + 1th port are formed in this way.

Further, the electric valve 2 of the above-described embodiment is used as an expansion valve provided between the condenser and the evaporator in a refrigeration cycle system including, for example, a compressor, a condenser, an expansion valve, an evaporator and the like. Be done.

2 Electric valve 4 Rotor 6 Valve shaft holder 6a Cylindrical part 6c Fitting part 6d Female screw 6f Flange part 6g Upper opening 6h Storage chamber 11 Valve chamber 12 First pipe joint 12a End face of the first pipe joint on the valve chamber 11 side 15 2nd pipe joint 16 2nd pipe joint 16a Thick part 16b Extension part 16f Upper end part 17 Valve body 18 Valve guide 18a Through hole 21 Ceiling part 30 Valve body 30a Groove 33 Valve seat member 41 Valve shaft 41a Male screw 41b Flange Section 51 Pressure equalizing hole 60 Case 67 Rotor accommodating chamber 70 Valve port 70a First port 70b First taper 70c Second port 70d Second taper 70e Third port 70k Lower end 71a annular flat surface 71b connection part of valve body 30 80 Rectifying section 80a Upper end of rectifying section 80 Rectifying section 82a End face of rectifying section 82 on the valve chamber 11 side 83 Valve shaft holder chamber 84 Brazing fixed 85 Rectifying member 85a Side wall 85b Side wall 85c Groove 85f Rectifying section 86 Rectifying section 88 Rectifying part 91 Constricted part 93 Concave part 100 Electric valve 111 First pipe joint 112 Second pipe joint 114 Valve body 120 Valve port 120a First port 120b First taper part 120c Second port D1 Inner circumference D2 of first port 70a Inner circumference of portion 80 D3 Inner circumference of second port 70c D4 Inner circumference of third port 70e h Pitch between pipe joints

The electric valve of the present invention is
The rotary motion of the rotor housed in the inner circumference of the case is converted into a linear motion by screwing the male screw member and the female screw member, and the valve body housed in the valve body is used as the axis based on this linear motion. It is an electric valve that moves in the direction.
The first pipe fitting mounted on the side surface of the valve body and
A valve seat member provided as a part of the valve body or as a separate part from the valve body and formed with a valve port.
A second pipe fitting communicating with the first pipe joint via the valve port is provided.
The valve port is most a first port located in said valve body side, a first tapered portion with wider inner circumference from the first port by countercurrent selfish continuously to the second pipe joint, the first tapered portion Including the second port formed on the second pipe joint side of the above.
Between the second fitting and the valve port, the rectifier unit intends line commutation fluid is disposed,
Wherein the second fitting, is formed constricted portion having a constricted radially inwardly, the rectifying unit is being sandwiched and fixed between the valve seat member and the constricted portion and said Rukoto.

Further, the electric valve of the present invention is
Since the rectifying section is sandwiched between the constricted portion formed radially inside the second pipe joint and the valve seat member , the rectifying section is rectified from the rectifying section to the valve port or from the valve port between the rectifying section and the valve port. Since the fluid flowing through the portion does not come into direct contact with the inside of the second pipe joint, the passing sound of the fluid can be suppressed more reliably.

Further, the electric valve of the present invention is
A through hole is formed in the straightening part, and a through hole is formed.
The area of the flow path passing through the rectifying section is larger than the area of the inner peripheral diameter of the first port.
It is characterized in that it is smaller than the area of the inner peripheral diameter of the port at the end of the valve seat member that sandwiches the end of the rectifying portion.

Claims (9)

The rotary motion of the rotor housed in the inner circumference of the case is converted into a linear motion by screwing the male screw member and the female screw member, and the valve body housed in the valve body is used as the axis based on this linear motion. It is an electric valve that moves in the direction.
The first pipe fitting mounted on the side surface of the valve body and
A valve seat member provided as a part of the valve body or as a separate part from the valve body and formed with a valve port.
A second pipe fitting communicating with the first pipe joint via the valve port is provided.
The valve port includes a first port located closest to the valve body, a first tapered portion whose inner peripheral diameter is widened from the first port toward the second pipe joint, and the first tapered portion of the first tapered portion. 2 Including the second port formed on the pipe joint side,
An electric valve characterized in that a cylindrical rectifying portion for rectifying a fluid is arranged or formed inside the second pipe joint or between the valve port and the second pipe joint. The electric valve according to claim 1, wherein the end portion of the rectifying portion on the valve body side is in contact with the valve seat member. The electric valve according to claim 1 or 2, wherein the inner peripheral diameter of the rectifying unit is wider than the inner peripheral diameter of the first port. The electric valve according to any one of claims 1 to 3, wherein the length of the rectifying unit in the axial direction is longer than the length of the first port in the axial direction. The invention according to any one of claims 1 to 4, wherein the rectifying unit is further arranged inside the first pipe joint or between the valve body and the first pipe joint. Electric valve. The rectifying unit is
A second pipe joint is provided with an extension portion that is extended by reducing the inner peripheral diameter and the outer peripheral diameter at the end portion connected to the valve port and is inserted into the inside of the valve port. The electric valve according to claims 1, 3 to 5. The valve port has a second tapered portion whose inner peripheral diameter is further widened from the second port toward the second pipe joint, and a third port formed on the second pipe joint side of the second tapered portion. The electric valve according to any one of claims 1 to 6, wherein the motorized valve comprises. The valve port further widens the inner peripheral diameter while continuously increasing the tapered portion and the port from the third port toward the second pipe joint, and the n-th tapered portion and the n-th tapered portion of the valve port. 2 Including the n + 1 port formed on the pipe joint side, including
The electric valve according to claim 7, wherein the value of n is 10 or less. A refrigeration cycle system including a compressor, a condenser, an expansion valve, and an evaporator, wherein the electric valve according to any one of claims 1 to 8 is used as the expansion valve. ..

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