JP7267970B2 - Two-stage electric valve and refrigeration cycle system - Google Patents

Description

The present invention relates to a two-stage motor operated valve and a refrigeration cycle system.

Conventionally, a motor-operated valve provided in a refrigeration cycle system of an air conditioner includes a main valve body that opens and closes a main valve port, and a sub-valve body that changes the opening degree of a sub-valve port formed in the main valve body. A two-stage electric valve is known (for example, see Patent Documents 1 and 2). The two-stage electric valve described in Patent Documents 1 and 2 has a large flow rate control region in which the flow rate is controlled by opening and closing the main valve port with the main valve body, and a sub valve in a state where the main valve body closes the main valve port. It has two flow rate control regions, one is a small flow control region in which the flow rate is controlled by changing the opening degree of the auxiliary valve port depending on the body. At this time, in the small flow rate control region, the two-stage motor operated valve has a A sound deadening member is provided. By passing the fluid in the small flow rate control region through the sound deadening member, the air bubbles in the fluid are subdivided and the passing sound is suppressed.

Japanese Unexamined Patent Application Publication No. 2017-211032 JP 2017-211034 A

Here, minute foreign matter may be mixed in the fluid flowing through the above-described two-stage electric valve. When such a fluid is passed through the sound deadening member, foreign matter in the fluid is captured by the sound deadening member. If such foreign matter continues to be captured by the sound deadening member, the trapped foreign matter may accumulate on the sound deadening member and eventually block the flow path of the fluid in the small flow rate control region.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a two-stage motor-operated valve capable of obtaining a silencing effect in a small flow rate control region and avoiding clogging of a flow path.

In order to solve the above problems, a two-stage electric valve according to the present invention includes a main valve body that opens and closes a main valve port, and a sub-valve body that changes the degree of opening of a sub-valve port formed in the main valve body. , wherein the main valve body is formed with a sub-valve chamber for housing the sub-valve body, and a sound deadening member is provided at least on a fluid outflow side of the sub-valve chamber, and the sound deadening member is A communication path is separately provided for communicating the main valve port and the sub-valve port , and the communication path is positioned outside the sub-valve port in a radial direction from the axis of the main valve body. do.
Further, a two-stage electric valve according to the present invention includes a main valve body that opens and closes a main valve port, and a sub-valve body that changes the degree of opening of a sub-valve port formed in the main valve body. A sub-valve chamber for accommodating the sub-valve is formed in the valve body, a communication hole for communicating the inside and the outside of the sub-valve chamber is formed in the sub-valve chamber on the fluid inflow side, and the silencer includes at least the above-mentioned A communication passage is provided inside the communication hole of the sub-valve chamber, and communicates between the inside and the outside of the sub-valve chamber separately from the sound deadening member.

Further, a two-stage electric valve according to the present invention includes a main valve body that opens and closes a main valve port, and a sub-valve body that changes the degree of opening of a sub-valve port formed in the main valve body. A sub-valve chamber for accommodating the sub-valve is formed in the valve body, and silencers are provided on fluid inflow and outflow sides of the sub-valve chamber. and a communication passage communicating between the main valve port and the sub-valve port.

According to the two-stage motor operated valve of the present invention, the communicating path communicating between the inside and the outside of the sub-valve chamber and/or the communicating path communicating between the main valve port and the sub-valve port are provided in the vicinity of the silencer member. For this reason, even if foreign matter in the fluid accumulates on the sound deadening member, the fluid flows through the communication passage, so that clogging of the flow passage can be avoided. That is, according to the two-stage electric valve of the present invention, in the small flow rate control region, the sound damping member allows the fluid to flow through the fluid inflow side or outflow side of the sub-valve chamber, or the fluid inflow side or outflow side of the sub-valve chamber. By subdividing the air bubbles inside, a noise reduction effect can be obtained and clogging of the flow path can be avoided.

Here, it is preferable that the communicating path includes a main-valve-side recess formed by cutting out a part of the main valve.

According to this configuration, since the communicating passage is configured to include the main valve body-side concave portion which is formed by cutting out a portion of the main valve body made of a highly rigid material and has a stable shape, etc., blockage of the flow path is prevented. Can be avoided with high stability.

Further, it is also preferable that the communication path includes a silencer-side recess formed by cutting out a part of the silencer.

According to this configuration, the communicating passage is formed by cutting out a part of the noise-absorbing member, which is easier to process than the main valve body, etc., for example. can be reduced.

Moreover, it is preferable that the communication passage is located outside the sub-valve port in a radial direction from the axis of the main valve body.

According to this configuration, when there is little foreign matter deposited in the fluid on the sound deadening member, most of the flow from the sub-valve port passes through the sound deadening member, so that the sound deadening effect is not hindered.

Further, the main valve body has a covered tubular portion that opens toward the main valve port, the auxiliary valve port is provided in the lid portion of the covered tubular portion, and the muffler is provided in the opening portion of the covered tubular portion. An annular holding portion that holds the outer peripheral portion of the member is provided, and at least a portion of the communication passage passes between a portion of the outer peripheral portion of the sound deadening member and the inner peripheral edge of the holding portion. It is also preferable to be provided in

According to this configuration, since the communication passage is provided so as to pass between the silencer and the holding portion, which have a higher degree of freedom in setting the shape at the time of design than, for example, the main valve body, shape consideration at the time of design. It is possible to obtain a communication path while suppressing the complexity of

Further, the main valve body has a covered tubular portion that opens toward the main valve port, the auxiliary valve port is provided in the lid portion of the covered tubular portion, and the muffler is provided in the opening portion of the covered tubular portion. An annular holding portion is provided to hold the outer peripheral portion of the member, and at least part of the communication path is formed between the outer peripheral edge of the holding portion and a portion of the inner peripheral portion of the opening portion of the covered tubular portion. It is also preferable to provide so as to pass through.

According to this configuration, since the communication passage is provided so as to pass between the main valve body and the holding portion, each of which is formed of a highly rigid material, the stability of the shape and the like is ensured, and the flow path occlusion can be avoided with high stability.

It is also preferable that a plurality of communication paths are provided.

According to this configuration, even if a situation such as clogging of one communication passage occurs, the fluid can be passed through the other communication passages, so it is possible to improve the accuracy of blockage avoidance in the small flow rate control region. .

In order to solve the above problems, a refrigeration cycle system of the present invention is characterized in that the above-described two-stage motor-operated valve of the present invention is provided on a fluid path.

According to the refrigerating cycle system of the present invention, since the two-stage motor-operated valve of the present invention is provided on the fluid path, the refrigerating cycle system obtains a silencing effect in a small flow rate control region and Road blockage can be avoided.

According to the check valve and the refrigerating cycle system of the present invention, the silencing member can obtain a silencing effect in a small flow rate control region and avoid clogging of the flow path.

1 is a vertical cross-sectional view showing a two-stage electric valve according to a first embodiment; FIG. FIG. 2 is an enlarged cross-sectional view of a main part of the two-stage motor-operated valve shown in FIG. 1; FIG. 3 is a plan view of the muffling member and communication path shown in FIGS. 1 and 2, viewed from the direction V11 in FIG. 2; FIG. 3 is an enlarged cross-sectional view of the main part of the two-stage electric valve of the second embodiment, similar to that of FIG. 2 ; 4. It is the top view which looked at the muffling member and communication path which are shown by FIG. 2 from the V21 direction in FIG. FIG. 6 shows a modification to the first and second embodiments shown in FIGS. 1 to 5; FIG. FIG. 10 is a diagram showing a two-stage motor operated valve of a third embodiment in an enlarged cross-section of the main part similar to FIG. 2; FIG. 8 is a plan view of the muffling member and communication path shown in FIG. 7 viewed from the direction V31 in FIG. 7; FIG. 10 is a diagram showing a two-stage motor operated valve of a fourth embodiment in an enlarged cross-section similar to that of FIG. 2 ; FIG. 10 is a plan view of the muffling member and communication path shown in FIG. 9 as seen from the direction V41 in FIG. 9; 1 is a schematic diagram showing a refrigeration cycle system according to one embodiment of the present invention; FIG.

A two-stage electric valve according to one embodiment of the present invention will be described. First, a first embodiment will be described with reference to FIGS. 1 to 3. FIG.

1 is a longitudinal sectional view showing the two-stage motor operated valve of the first embodiment, FIG. 2 is an enlarged sectional view of the main part of the two-stage motor operated valve shown in FIG. 1, and FIG. 3 is a plan view of the sound deadening member and communication passage shown in FIGS. 1 and 2, viewed from the direction V11 in FIG. 2; FIG. It should be noted that the concept of "up and down" in the following description corresponds to up and down in the drawings of FIGS. 1 and 2. FIG.

A two-stage motor-operated valve 10 of this embodiment first includes a valve housing 1 , a main valve body 2 , a sub-valve body 3 , and an actuator 4 .

The valve housing 1 has a tubular valve main body 1A and a support member 1B fixed inside the valve main body 1A. The valve main body 1A has a cylindrical main valve chamber 1C formed therein, and a primary joint pipe 11 is attached to the valve main body 1A to communicate with the main valve chamber 1C from the side surface and into which a fluid such as a refrigerant flows. A secondary joint pipe 12 is attached from the bottom side to communicate with the main valve chamber 1C and outflow the fluid. Further, a main valve seat 13 is formed in the valve main body 1A at a position where the main valve chamber 1C and the secondary joint pipe 12 communicate with each other, and the cross-sectional shape extends from the main valve seat 13 to the secondary joint pipe 12 side. A circular main valve port 14 is formed. The support member 1B is welded and fixed to the valve main body 1A by a fixing portion 15 made of metal. The support member 1B is a resin molded product, and includes a cylindrical main valve guide portion 16 provided on the main valve seat 13 side, and a female threaded portion provided on the drive portion 4 side and formed with a female thread on the inner peripheral surface. 17 and . A case 18 is hermetically fixed to the upper end of the valve body 1A by welding or the like.

The main valve body 2 is a portion that opens and closes the main valve port 14, and as shown in FIG. , a stopper portion 2B, and a sub-valve seat 2C. The valve body main portion 2A includes a cylindrical portion 22 having an axis L as an axial direction, a sub-valve chamber 23 formed inside the cylindrical portion 22 and through which a fluid flows, and a sub-valve seat 2C along the axis L. and a sub-valve port 24 . A plurality of communication holes 25 are formed in the peripheral surface of the cylindrical portion 22, and the auxiliary valve chamber 23 communicates with the main valve chamber 1C through the communication holes 25. As shown in FIG. An insertion hole 26 is formed along the axis L in the inner peripheral surface of the cylindrical portion 22 of the valve body main portion 2A. The stopper portion 2B is formed in an annular shape and is fixed to the upper end portion of the valve body main portion 2A. Regulate the rising position. A stepped shape is formed from the upper end portion of the valve body main portion 2A to the lower side, and a main valve spring 27 is arranged between this stepped shape and the ceiling surface of the support member 1B. The main valve spring 27 biases the main valve body 2 toward the main valve seat 13 (close direction).

The sub-valve element 3 is a part that changes the degree of opening of the sub-valve port 24 formed in the main valve element 2 . The sub-valve element 3 includes a cylindrical sub-valve base portion 3A, a sub-valve portion 3B projecting downward from the sub-valve base portion 3A, a thrust washer 3C provided above the sub-valve base portion 3A, and the sub-valve base portion 3A. and a sub-valve spring (not shown) provided inside. The sub-valve base portion 3A is inserted through the insertion hole 26 of the main valve body 2 and is supported so as to be vertically movable along the axis L and rotatable about the axis L. As shown in FIG. The thrust washer 3C can contact the upper surface of the sub valve base portion 3A and the lower surface of the stopper portion 2B, so that the frictional force between the contact surfaces is extremely small. An insertion hole is provided in the upper portion of the sub-valve base portion 3A, through which the rotor shaft 46 is inserted. A sub-valve spring is disposed between the upper end of the portion 3B. The sub valve spring urges the sub valve body 3 toward the sub valve seat 2C (close direction) with respect to the rotor shaft 46 (magnet rotor 44). The sub-valve base portion 3A may be formed integrally with the rotor shaft 46 and the sub-valve portion 3B. In that case, the sub-valve base portion 3A may be formed in a solid shape and the sub-valve spring may be omitted. .

The drive unit 4 is a part that advances and retracts the sub valve body 3 in the direction of the axis L and also moves the main valve body 2 in the direction of the axis L through the sub valve body 3 . The drive unit 4 includes a stepping motor 41 as a drive source, a screw feed mechanism 42 that advances and retracts the sub valve body 3 by rotation of the stepping motor 41 , and a stopper mechanism 43 that restricts rotation of the stepping motor 41 . The stepping motor 41 includes a magnet rotor 44 whose outer periphery is magnetized with multiple poles, a stator coil 45 arranged on the outer periphery of the case 18, and a rotor shaft 46 fixed to the magnet rotor 44. . The rotor shaft 46 is fixed to the magnet rotor 44 via a fixing member 46 a, extends along the axis L, and has its upper end inserted into the guide 47 of the stopper mechanism 43 . A male threaded portion 46b is formed integrally with the intermediate portion of the rotor shaft 46, and this male threaded portion 46b is screwed into the female threaded portion 17 of the support member 1B, thereby forming a screw feed mechanism 42. As shown in FIG. When the magnet rotor 44 rotates, the male threaded portion 46b of the rotor shaft 46 is guided by the female threaded portion 17, so that the magnet rotor 44 and the rotor shaft 46 move forward and backward in the direction of the axis L, and the sub valve body 3 also moves accordingly. It rises or falls along the axis L.

The stopper mechanism 43 includes a cylindrical guide 47 suspended from the ceiling of the case 18, a spiral guide wire 48 fixed to the outer periphery of the guide 47, and a guide wire 48 that rotates and moves vertically. a movable slider 49; The movable slider 49 is provided with a claw portion 49a that protrudes radially outward, and the magnet rotor 44 is provided with an extension portion 44a that extends upward and contacts the claw portion 49a. When the magnet rotor 44 rotates, the extension part 44a pushes the claw part 49a, so that the movable slider 49 follows the guide wire body 48 to rotate and move up and down. The guide wire body 48 is formed with an upper end stopper 48 a that defines the uppermost position of the magnet rotor 44 and a lower end stopper 48 b that defines the lowermost position of the magnet rotor 44 . When the movable slider 49 comes into contact with the upper end stopper 48a and the lower end stopper 48b, the rotation of the movable slider 49 is stopped, the rotation of the magnet rotor 44 is restricted, and the rise or fall of the sub valve body 3 is also stopped. be.

Briefly, the two-stage electric valve 10 configured as described above operates as follows. First, it is assumed that the two-stage electric valve 10 is in the valve closed state in which the main valve portion 21 of the main valve body 2 is seated on the main valve seat 13 and the main valve port 14 is closed. 1 and 2 show the two-stage electric valve 10 in the closed state. Furthermore, in the two-stage motor operated valve 10 of FIGS. 1 and 2, the sub-valve element 3 is at the closest position to the sub-valve port 24 . At this time, the sub-valve element 3 is not seated on the sub-valve seat 2C, and a flow path is formed by the gap between the outer peripheral surface of the sub-valve portion 3B of the sub-valve element 3 and the inner peripheral surface of the sub-valve port 24. . Therefore, the fluid that has flowed into the main valve chamber 1C from the primary joint pipe 11 passes through the communication hole 25 of the valve body main portion 2A and flows into the sub-valve chamber 23 . The fluid that has flowed into the sub-valve chamber 23 flows below the main valve portion 21 through the gap between the sub-valve portion 3B and the sub-valve port 24 and flows out from the main valve port 14 toward the secondary joint pipe 12 . That is, even if the valve opening degree is zero (the auxiliary valve portion 3B is at the lowest position), a minute flow rate is generated.

Next, by driving the stepping motor 41 of the drive unit 4 to rotate the magnet rotor 44 to raise the sub-valve element 3, the sub-valve portion 3B of the sub-valve element 3 rises inside the sub-valve port 24. , the flow path is enlarged by the gap between the sub-valve portion 3B and the sub-valve port 24, and the flow rate gradually increases. At this time, since the main valve portion 21 of the main valve body 2 remains seated on the main valve seat 13, the increase in flow rate is slight. The control region in which the opening degree of the sub-valve 3 is changed while the main valve 2 is closed is the small flow rate control region. Next, when the sub valve body 3 is further raised, the thrust washer 3C contacts the stopper portion 2B, the main valve body 2 is pulled up by the sub valve body 3, and the main valve portion 21 is separated from the main valve seat 13. . The control region in which the opening of the main valve port 14 is changed by separating the main valve body 2 in this manner is the large flow rate control region, and the change in the flow rate in this large flow rate control region is large. 2 is furthest from the main valve port 14, the maximum flow rate.

Here, in the two-stage electric valve 10 of the present embodiment, when the fluid passes through the narrow space between the sub-valve port 24 and the sub-valve portion 3B of the sub-valve element 3 in the small flow rate control region, In order to suppress the sound passing through, the following noise reduction member 5 is provided.

The sound deadening member 5 is formed of a porous material, a metal mesh, or the like in a disc shape, and is provided between the main valve port 14 and the sub valve port 24 . The main valve portion 21 of the main valve body 2 is a lidded tubular portion that opens toward the main valve port 14, and the lid portion of the lidded tubular portion serves as the sub valve seat 2C. A secondary valve port 24 is provided which is coaxial with the axis of body 2 . A noise reduction member 5 is fitted into a cylindrical first step recess 21 a provided in the opening of the main valve portion 21 . Further, in the opening portion of the main valve portion 21, an annular holding portion 21c is provided in a shallow cylindrical second step recess 21b provided with a large diameter at a position closer to the main valve port 14 than the first step recess 21a. It's stuck. The holding portion 21c holds the outer peripheral portion of the sound deadening member 5 so that the sound deadening member 5 does not protrude from the first step recess 21a.

Fluid passing through the gap between the sub-valve port 24 and the sub-valve portion 3B of the sub-valve element 3 in the small flow rate control region passes through the silencer member 5 on its way to the main valve port 14 . At this time, the air bubbles in the fluid are subdivided by the sound deadening member 5 formed of a porous material, a metal mesh, or the like, and the subdivision suppresses the passing sound of the fluid.

Further, in the two-stage electric valve 10 of the present embodiment, a communication passage 21d is provided in the vicinity of the silencer member 5, which communicates the main valve port 14 and the sub-valve port 24 with each other. This communication passage 21d is a main valve body side concave portion obtained by cutting out a part of the main valve body 2, specifically, by cutting out a part of the inner peripheral surface of the main valve portion 21 in a semi-cylindrical shape. The communicating passage 21d is deeper than the second step recess 21b in which the holding portion 21c is fitted in the outer diameter direction of the covered cylindrical main valve portion 21, and is deeper in the axial direction than the first step in which the sound deadening member 5 is fitted. It is formed by notching so as to be deeper than the recess 21a. As a result, a portion of the communicating passage 21d on the side of the main valve port 14 passes between the outer peripheral edge of the holding portion 21c and the main valve body side concave portion that is a portion of the inner peripheral portion of the opening portion of the main valve portion 21. It is supposed to be provided so that

According to the two-stage electric valve 10 of the present embodiment, the communication passage 21d is provided in the vicinity of the silencer member 5 so as to communicate the main valve port 14 and the sub-valve port 24 with each other. Therefore, even if foreign matter in the fluid accumulates on the sound deadening member 5, clogging of the flow path can be avoided because the fluid flows through the communication path 21d. In other words, according to the present embodiment, the silencing member 5 can obtain a silencing effect in a small flow rate control region and can avoid clogging of the flow path.

Here, in the present embodiment, the communication passage 21d is a main valve body side concave portion obtained by notching a part of the main valve body 2 . According to this configuration, the communication passage 21d is configured as a main valve body-side concave portion having a stable shape, which is formed by cutting out a part of the main valve body 2 made of a highly rigid material. Can be avoided with high stability.

Further, in this embodiment, the communication passage 21d is arranged at a position radially outside the sub-valve port 24 . According to this configuration, when there is little foreign matter deposited in the fluid on the sound deadening member 5, most of the fluid flowing from the sub-valve port 24 to the main valve port 14 passes through the sound deadening member 5, impairing the sound deadening effect. never do.

Further, in this embodiment, the main valve body 2 has a main valve portion 21 as a lidded cylindrical portion that opens toward the main valve port 14, and a sub-valve port 24 is provided in the lid portion of the main valve portion 21. An annular holding portion 21c for holding the outer peripheral portion of the noise reduction member 5 is provided in the opening portion of 21. As shown in FIG. A portion of the communication passage 21d is provided so as to pass between the outer peripheral edge of the holding portion 21c and a portion of the inner peripheral portion of the opening portion of the main valve portion 21 . According to this configuration, since the communication passage 21d is provided so as to pass between the main valve body 2 and the holding portion 21c, which are each made of a highly rigid material, the stability of the shape and the like is ensured. , blockage of the flow path can be avoided with high stability.

In the first embodiment, the communication passage is an example of the main valve body side concave portion obtained by notching a part of the inner peripheral surface of the main valve portion 21 in a semi-cylindrical shape. It is not limited to this.

Next, a second embodiment will be described with reference to FIGS. 4 and 5. FIG.

FIG. 4 is an enlarged cross-sectional view of the main part of the two-stage motor-operated valve of the second embodiment, similar to FIG. 2. FIG. It is the top view seen from V21 direction in FIG. Note that the concept of "up and down" in the following description corresponds to up and down in FIG. Further, in FIGS. 4 and 5, the same reference numerals as in FIGS. 1 to 3 denote the same constituent elements as the constituent elements of the two-stage electric valve 10 of the first embodiment shown in FIGS. 1 to 3. Duplicate description of these equivalent components will be omitted below.

The two-stage electric valve 10' of the second embodiment includes a silencer member 5', a first step recessed portion 21a' for mounting the silencer member 5' at the opening of the main valve portion 21' of the main valve body 2', and a second recessed portion 21a'. The shapes of the two-step recess 21b' and the communication path 21d' are different from those of the first embodiment.

In the present embodiment, a communication passage 21d' is formed as a sound deadening member-side recessed portion obtained by notching a part of the outer periphery of the sound deadening member 5' in a D-cut shape. On the other hand, the inner peripheral portion of the opening portion of the main valve portion 21' is not notched, and the first stepped recess portion 21a' and the second stepped recess portion 21b' are formed over the entire circumference. As a result, a portion of the communication passage 21d' on the side of the main valve port 14 is provided so as to pass between the D-cut portion, which is a portion of the outer peripheral portion of the noise reduction member 5', and the inner peripheral edge of the holding portion 21c. It is supposed to be

In the two-stage motor-operated valve 10' of the second embodiment described above, similarly to the two-stage motor-operated valve 10 of the second embodiment described above, the noise reduction member 5' provides a silencing effect in the small flow rate control range. Needless to say, blockage of the flow path can be avoided together with this.

Here, in the present embodiment, the communicating passage 21d' is a recess on the side of the sound deadening member 5' which is partly cut out. According to this configuration, the communication passage 21d' is formed as a recess on the side of the sound deadening member 5' which is easier to work than the main valve body 2', for example. It is possible to reduce the manufacturing cost required for the formation of the

Further, in the present embodiment, the communication passage 21d' is arranged radially outside the sub-valve port 24. As shown in FIG. According to this configuration, similarly to the two-stage electrically operated valve 10 of the first embodiment, when there is little foreign matter deposited in the fluid on the sound deadening member 5', the fluid flowing from the sub-valve port 24 to the main valve port 14 Most of the noise passes through the muffling member 5', so it does not impede the muffling effect.

Further, in the present embodiment, at least part of the communicating passage 21d' is provided so as to pass through a portion of the outer peripheral portion of the sound deadening member 5' and the inner peripheral edge of the holding portion 21c. According to this configuration, the communication passage 21d' is provided so as to pass between the holding portion 21c and the noise reduction member 5', which has a higher degree of freedom in designing the shape than the main valve body 2' or the like. Therefore, the communication path 21d' can be obtained while suppressing the complexity of the shape examination at the time of designing.

In the second embodiment, the communication passage is exemplified as a sound-absorbing member-side recess formed by notching a part of the outer periphery of the sound-absorbing member 5' in a D-cut shape. It is not limited.

Next, a modified example of the first and second embodiments described above will be described with reference to FIG.

FIG. 6 is a diagram showing a modification to the first and second embodiments shown in FIGS. 1-5. The modification shown in FIG. 6 is an example in which the number of communicating passages 21d and 21d' is increased in each of the first and second embodiments, and FIG. 6A shows the first modification. 6(B) shows a second modification. In FIG. 6 as well, the same reference numerals as in FIGS. 1 to 5 are assigned to the same components as those in the first and second embodiments shown in FIGS. Duplicate descriptions of equivalent components are omitted.

In the first modification shown in FIG. 6A, the communication passages 21d in the first embodiment are provided at two symmetrical locations with the axis L interposed therebetween. That is, in this modified example, the inner peripheral portion of the opening portion of the main valve portion 21 is notched at the two locations described above to form two communicating passages 21d.

In addition, in the second modification shown in FIG. 6B, the communication passages 21d' in the second embodiment are provided at two symmetrical locations with the axis L interposed therebetween. In other words, in this modified example, the outer peripheral edge of the sound deadening member 5' is notched at the two locations to form two communication paths 21d'.

According to both the first and second modifications described above, the noise reduction effect in the small flow rate control region can be obtained by the noise reduction members 5, 5' in the same manner as the two-stage electric valve 10 of the second embodiment described above. Needless to say, blockage of the flow path can be avoided together with this.

Here, in the first and second modifications, a plurality (specifically, two) of the communication paths 21d and 21d' are provided. According to this configuration, even if one of the communicating passages 21d and 21d' is blocked, the fluid can pass through the other communicating passages 21d and 21d'. can improve the accuracy of

Next, a third embodiment will be described with reference to FIGS. 7 and 8. FIG.

FIG. 7 is an enlarged cross-sectional view of the main part of the two-stage motor-operated valve of the third embodiment, similar to FIG. 2. FIG. FIG. 8 is a plan view of the provided sound deadening member and communication path as seen from the direction V31 in FIG. 7; Note that the concept of "up and down" in the following description corresponds to up and down in FIG. In addition, in FIGS. 7 and 8, the same reference numerals as in FIGS. 1 to 3 denote the same components as the components of the two-stage electric valve 10 of the first embodiment shown in FIGS. 1 to 3. Duplicate description of these equivalent components will be omitted below.

In the two-stage electric valve 10'' of the third embodiment, the fixing structure of the noise reduction member 5 between the sub-valve port 24 and the main valve port 14 and the communication passage 21d in the vicinity thereof are the same as in the first embodiment. . A different point from the first embodiment is that in addition to the noise reduction member 5 and the communication passage 21d of the first embodiment, a noise reduction member 6 and a communication passage 21e described below are provided. Specifically, as shown in FIGS. 7 and 8, a communication hole 25' provided in the main valve portion 21'' of the main valve body 2'' communicates the sub-valve chamber 23 and the main valve chamber 1C. ', a cylindrical sound-absorbing member 6 made of a porous material, metal mesh, or the like is fitted by press-fitting or the like, and a part of the inner peripheral surface of the communication hole 25'' is parallel to the axis of the communication hole 25''. A communicating passage 21e is formed by cutting out in a semi-cylindrical shape. This communication passage 21e is also a recess on the main valve body side.

According to the two-stage electric valve 10'' of the present embodiment, in addition to the noise reduction effect and the blockage avoidance effect of the noise reduction member 5 when the refrigerant flows from the sub-valve port 24 to the main valve port 14 of the first embodiment, When the refrigerant flows from the main valve chamber 1C into the sub-valve chamber 23, the noise reduction effect due to the fragmentation of air bubbles in the refrigerant in the noise reduction member 6 and the clogging of the noise reduction member 6 due to foreign matter accumulation are avoided by the communication passage 21e. effect is obtained.

In this embodiment, in addition to the first embodiment, the noise reduction member 6 and the communication passage 21e are provided like the main valve body 2''. is advantageous in terms of processing man-hours and assembly man-hours. It may be one in which only the noise reduction member 6 and the communication passage 21e are provided. Furthermore, although the communication path 21e is illustrated as a semi-cylindrical notch, the shape of the communication path 21e is not limited to this.

Furthermore, it goes without saying that Modification 1 corresponding to the above-described first embodiment may be applied to this embodiment.

Next, a fourth embodiment will be described with reference to FIGS. 9 and 10. FIG.

FIG. 9 is an enlarged cross-sectional view of the main part of the two-stage motor-operated valve of the fourth embodiment, similar to FIG. 2. FIG. FIG. 8 is a plan view of the provided sound deadening member and communication path as seen from the direction V41 in FIG. 7; Note that the concept of "up and down" in the following description corresponds to up and down in FIG. 9 and 10, the same reference numerals as in FIGS. 4 and 5 denote the same components as those of the two-stage motor operated valve 10' of the second embodiment shown in FIGS. , and duplicate descriptions of these equivalent components will be omitted below.

In the two-stage electric valve 10''' of the fourth embodiment, the fixing structure of the silencer member 5' between the sub-valve port 24 and the main valve port 14 and the communication passage 21d' in the vicinity thereof are different from those of the second embodiment. are the same. A different point from the second embodiment is that, in addition to the muffling member 5' and the communication path 21d' of the second embodiment, a muffling member 6' and a communication path 21e' described below are provided. Specifically, as shown in FIGS. 9 and 10, a communication hole is provided in the main valve portion 21''' of the main valve body 2''' and communicates the sub-valve chamber 23 with the main valve chamber 1C. 25, a sound deadening member 6' formed of a porous material, a metal mesh, or the like in a columnar shape and having a part of the outer periphery cut out in a D-shape is fitted by press fitting or the like, so that the inner peripheral surface of the communication hole 25 and the sound deadening member 6' are fitted. A gap in the D-cut surface of the member 6' is formed as a communicating passage 21e'. A D-cut portion of the sound deadening member 6' is a recess on the side of the sound deadening member.

According to the two-stage electric valve 10''' of the present embodiment, in addition to the noise reduction effect and the blockage avoidance effect of the noise reduction member 5' when the refrigerant flows from the sub-valve port 24 to the main valve port 14 of the second embodiment, Therefore, when the refrigerant flows from the main valve chamber 1C into the sub-valve chamber 23, the noise reduction effect due to the fragmentation of the air bubbles in the refrigerant in the noise reduction member 6' and the deposition of foreign matter on the noise reduction member 6' through the communicating passage 21e' are caused. The effect of avoiding occlusion is obtained.

In this embodiment, in addition to the second embodiment, the main valve body 2''' is provided with a noise reduction member 6' and a communication passage 21e'. Since the reduction in the number of parts is advantageous in terms of processing man-hours and assembly man-hours, the main valve body 2 can be constructed without providing the silencer 5' and the communication passage 21d' between the main valve port 14 and the sub-valve port 24. As in '''', only the noise reduction member 6' and the communication passage 21e' may be provided. Furthermore, although the sound deadening member 6' is exemplified by notching a part of the outer periphery in a D-cut shape, the shape of the sound deadening member 6' is not limited to this. may be provided.

Furthermore, it goes without saying that Modified Example 2 corresponding to the above-described second embodiment may be applied to this embodiment.

Next, a refrigeration cycle system according to one embodiment of the present invention will be described.

FIG. 11 is a schematic diagram showing a refrigeration cycle system according to one embodiment of the present invention.

A refrigeration cycle system 90 shown in FIG. 11 is used, for example, in an air conditioner such as a domestic air conditioner. The two-stage motor operated valves 10, 10', 10''' and their modifications (hereinafter simply referred to as two-stage motor operated valves 10 to 10''') of the above-described embodiments are the first It is provided between the indoor heat exchanger 91 (operating as a cooler during dehumidification) and the second indoor heat exchanger 92 (operating as a heater during dehumidification). The two-stage motor operated valves 10 to 10''' constitute a heat pump refrigerating cycle together with a compressor 95, a four-way valve 96, an outdoor heat exchanger 94 and an electronic expansion valve 93. A first indoor heat exchanger 91, a second indoor heat exchanger 92 and two-stage motor operated valves 10 to 10''' are installed indoors, a compressor 95, a four-way valve 96, an outdoor heat exchanger 94 and The electronic expansion valve 93 is installed outdoors and constitutes an air conditioner.

The two-stage motor operated valves 10 to 10''' as dehumidification valves have the main valve ports 14 fully opened by the main valve bodies 2, 2', 2''' during cooling or heating other than during dehumidification. The first indoor heat exchanger 91 and the second indoor heat exchanger 92 constitute one indoor heat exchanger. The integrated indoor heat exchanger and outdoor heat exchanger 94 alternatively function as an "evaporator" and a "condenser". That is, the electronic expansion valve 93 is provided between the evaporator and the condenser.

According to this refrigeration cycle system 90, the above-described two-stage motor operated valves 10 to 10''' of the present invention are provided on the fluid path. For this reason, in the refrigeration cycle system 90, it is needless to say that the silencing members 5, 5' can obtain a silencing effect in the small flow rate control region and avoid clogging of the flow path.

It should be noted that the first to fourth embodiments and the first and second modified examples described above merely show representative forms of the present invention, and the present invention is not limited to these. That is, various modifications can be made without departing from the gist of the present invention. As long as such a modification still has the configuration of the two-stage electric valve of the present invention, it is, of course, included in the scope of the present invention.

For example, the first to fourth embodiments and the first and second modifications described above exemplify the two-stage motor operated valves 10 to 10''' used in air conditioners such as domestic air conditioners. However, the two-stage motor-operated valve is not limited to domestic air conditioners, and may be applied to commercial air conditioners, and is not limited to air conditioners, and can be applied to various types of refrigerators, refrigerators, and the like.

In addition, in the first to fourth embodiments and the first and second modifications described above, as an example of the communication passage, the communication passages 21d and 21e as the main valve body-side recessed portions obtained by notching a part of the main valve body 2, , a communicating path 21d' as a muffling member-side recess formed by cutting out a part of the muffling member 5', and a communicating path 21e' as a muffling-member-side recess formed by cutting out a part of the muffling member 6' are exemplified. . However, the communication path is not limited to this, and any one formed in the vicinity of the sound deadening member so as to communicate the inside and the outside of the sub-valve chamber or to communicate the main valve port and the sub-valve port may be used. It does not ask about the concrete formation mode. However, by forming the communication passages 21d and 21e as main valve body side concave portions by notching a part of the main valve body 2, blockage of the flow path can be avoided with high stability as described above. is. In addition, by forming a communication path 21d' as a muffling member-side recessed portion obtained by cutting out a part of the muffling member 5' and a communicating path 21e' as a muffling-member-side recessed portion obtained by cutting out a part of the muffling member 6', As described above, the manufacturing cost for forming the communication paths 21d' and 21e' can be reduced. Here, the communication passages are not limited to the communication passages 21d and 21e formed only by the main valve side recesses and the communication passages 21d' and 21e' formed only by the silencer side recesses. If the communication passage includes a recess on the main valve body side, or includes a recess on the silencer member side, the communication passage may be configured to have both of these two types of recesses. good too.

In addition, in the above-described first and second modifications, a plurality of, specifically, two communicating paths 21d and 21d' are provided as examples of communicating paths. However, the number of communication paths 21d and 21d' may be one as in the first and second embodiments described above. However, as described above, by providing a plurality of communication paths 21d and 21d', it is possible to improve the accuracy of blockage avoidance in the small flow rate control region. Even when a plurality of communication paths are provided, the number is not limited to two, and three or more may be provided. Further, the forming positions are not limited to symmetrical positions as in the above-described first and second modifications, and may be formed at arbitrary positions. Furthermore, instead of providing a plurality of communication paths of the same type as in the above-described first and second modifications, communication paths of different types may be provided in a mixed manner. Needless to say, the above also applies to the communication paths 21e and 21e' of the third and fourth embodiments.

Further, in the first embodiment and the first modified example described above, as an example of the communication path, the communication path is such that it passes between the outer peripheral edge of the holding portion 21c and a part of the inner peripheral portion of the opening portion of the main valve portion 21. 21 d of communication paths provided are illustrated. In addition, in the second embodiment and the second modified example described above, as an example of the communication path, the communication path is provided so as to pass between a part of the outer peripheral portion of the sound deadening member 5' and the inner peripheral edge of the holding portion 21c. Passageway 21d' is illustrated. However, the communication path is not limited to these, and any passing route can be set arbitrarily. However, by providing the communication passage 21d so as to pass between the outer peripheral edge of the holding portion 21c and a part of the inner peripheral portion of the opening portion of the main valve portion 21, the flow passage can be blocked with high stability. The points that can be avoided are as described above. Further, by providing the communication path 21d' so as to pass between a part of the outer peripheral portion of the noise reduction member 5' and the inner peripheral edge of the holding portion 21c, the complexity of shape consideration at the time of designing can be suppressed, and the communication path can be can be obtained as described above.

Further, in the first to fourth embodiments and the first and second modifications described above, it is described that the refrigerant flows in from the primary joint pipe 11 and flows out from the secondary joint pipe 12. It is not limited to the flow, and can be applied to the case where the refrigerant flows in from the secondary joint pipe 12 and flows out from the primary joint pipe 11 as reverse flow, especially in a fully open state.

1 valve housing 2, 2', 2'', 2''' main valve body 2C sub-valve seat 3 sub-valve body 4 drive unit 5, 5', 6, 6' muffling member 10, 10', 10'', 10''' two-stage electric valve 11 primary joint pipe 12 secondary joint pipe 13 main valve seat 14 main valve port 21, 21', 21'', 21''' main valve portion (covered cylindrical portion)
21a, 21a' first step recess 21b, 21b' second step recess 21c holding portion 21d, 21d', 21e, 21e' communication passage 24 auxiliary valve port 25, 25'' communication hole 90 refrigeration cycle system L axis

Claims (10)

a main valve body that opens and closes the main valve port;
a sub-valve body that changes the degree of opening of a sub-valve port formed in the main valve body,
A sub-valve chamber for housing the sub-valve is formed in the main valve,
A sound deadening member is provided at least on the outflow side of the fluid in the sub-valve chamber,
A communication passage for communicating the main valve port and the sub-valve port is provided separately from the muffling member ,
The communication passage is located outside the sub-valve port in a radial direction from the axis of the main valve body.
A two-stage electric valve characterized by: a main valve body that opens and closes the main valve port;
a sub-valve body that changes the degree of opening of a sub-valve port formed in the main valve body,
A sub-valve chamber for housing the sub-valve is formed in the main valve ,
a communication hole communicating between the interior and exterior of the sub-valve chamber is formed on the fluid inflow side of the sub-valve chamber;
a muffling member is provided at least inside the communication hole of the sub-valve chamber,
A two -stage motor-operated valve, characterized in that a communication passage for communicating between the inside and the outside of the sub-valve chamber is provided separately from the sound deadening member. a main valve body that opens and closes the main valve port;
a sub-valve body that changes the degree of opening of a sub-valve port formed in the main valve body,
The main valve body is formed with a sub-valve chamber that houses the sub-valve body, and silencers are provided on fluid inflow and outflow sides of the sub-valve chamber,
A two-stage electric valve characterized in that a communication passage for communicating the inside and the outside of the sub-valve chamber and a communication passage for communicating the main valve port and the sub-valve port are provided separately from the muffling member. valve. The two-stage electric motor according to any one of claims 1 to 3, wherein the communication passage includes a main valve body side concave portion obtained by notching a part of the main valve body. valve. The two-stage motor-operated valve according to any one of claims 1 to 4 , wherein the communication passage includes a silencer-side recess formed by cutting out a part of the silencer. . 4. The two-stage motor-operated valve according to claim 3 , wherein the communication passage is positioned outside the sub-valve port in a radial direction from the axis of the main valve body. The main valve body has a lidded tubular portion that opens toward the main valve port, the sub-valve port is provided in the lid portion of the lidded tubular portion, and the silencer member is provided in the opening portion of the lidded tubular portion. An annular holding portion is provided to hold the outer peripheral portion,
At least a portion of the communication path is provided so as to pass through a portion of the outer peripheral portion of the sound deadening member and an inner peripheral edge of the holding portion. A two-stage motor operated valve according to any one of the preceding items. The main valve body has a lidded tubular portion that opens toward the main valve port, the sub-valve port is provided in the lid portion of the lidded tubular portion, and the silencer member is provided in the opening portion of the lidded tubular portion. An annular holding portion is provided to hold the outer peripheral portion,
3. The communication path is provided so as to pass through at least part of the communication path between the outer peripheral edge of the holding part and a part of the inner peripheral part of the opening of the lidded tubular part. 7. The two-stage motor operated valve according to any one of 1 to 6 . The two-stage motor-operated valve according to any one of claims 1 to 8 , wherein a plurality of said communicating passages are provided. A refrigeration cycle system, wherein the two-stage motor-operated valve according to any one of claims 1 to 9 is provided on a fluid path.

Images