CN113494618B

CN113494618B - Two-stage electric valve and refrigeration cycle system

Info

Publication number: CN113494618B
Application number: CN202110315584.1A
Authority: CN
Inventors: 中川大树; 小池亮司
Original assignee: Saginomiya Seisakusho Inc
Current assignee: Saginomiya Seisakusho Inc
Priority date: 2020-04-07
Filing date: 2021-03-24
Publication date: 2023-11-14
Anticipated expiration: 2041-03-24
Also published as: JP2021165574A; CN117345884A; JP7267970B2; CN113494618A

Abstract

The invention provides a two-stage type electric valve and a refrigeration cycle system, which can obtain a silencing effect in a small flow control area and can avoid blockage of a flow path. The two-stage motor-operated valve (10) is characterized by comprising: a main valve element (2) that opens and closes a main valve port (14); an auxiliary valve body (3) which changes the opening of an auxiliary valve port (24) formed in a main valve body (2), wherein an auxiliary valve chamber (23) which accommodates the auxiliary valve body (3) is formed in the main valve body (2), a silencing member (5) is arranged on the outflow side of the fluid in the auxiliary valve chamber (23), and a communication path (21 d) which communicates the main valve port (14) and the auxiliary valve port (24) is arranged near the silencing member (5).

Description

Two-stage electric valve and refrigeration cycle system

Technical Field

The present invention relates to a two-stage type electric valve and a refrigeration cycle system.

Background

Conventionally, as an electric valve provided in a refrigeration cycle system of an air conditioner, a two-stage electric valve including a main valve body for opening and closing a main valve port and a sub valve body for changing the opening degree of a sub valve port formed in the main valve body has been known (for example, refer to patent documents 1 and 2). The two-stage motor-operated valves described in patent documents 1 and 2 have two flow control regions, i.e., a large flow control region in which a main valve element opens and closes a main valve port to control a flow, and a small flow control region in which a sub valve element changes an opening degree of a sub valve port to control a flow in a state in which the main valve element closes the main valve port. In this case, in order to suppress the sound of the fluid flowing through the main port in the small flow rate control region through the narrow portion such as the gap between the sub-port and the sub-valve body, the secondary electric valve is provided with a muffler. By passing the fluid in the small flow rate control region through the muffler, bubbles in the fluid are thinned, and the above-described passing sound is suppressed.

Prior art literature

Patent document 1: japanese patent laid-open publication No. 2017-211032

Patent document 2: japanese patent laid-open No. 2017-211034

Here, a minute foreign matter may be mixed in the fluid flowing through the two-stage motor-operated valve. When such fluid passes through the silencer component, foreign matters in the fluid are caught by the silencer component. Further, if such foreign matter is continuously trapped in the silencing member, the trapped foreign matter may accumulate on the silencing member, and may soon clog the flow path of the fluid in the small flow rate control region.

Disclosure of Invention

Accordingly, the present invention has been made in view of the above-described problems, and an object thereof is 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 passage.

In order to solve the above problems, a two-stage motor-operated valve according to the present invention includes: a main valve element that opens and closes a main valve port; and a sub valve body that changes an opening degree of a sub valve port formed in the main valve body, wherein a sub valve chamber that accommodates the sub valve body is formed in the main valve body, a silencing member is provided on an inflow side and an outflow side of a fluid in the sub valve chamber, and a communication path that communicates the inside and the outside of the sub valve chamber and a communication path that communicates the main valve port and the sub valve port are provided in the vicinity of the silencing member independently of the silencing member.

The two-stage motor-operated valve according to the present invention is characterized by comprising: a main valve element that opens and closes a main valve port; and a sub valve body that changes an opening degree of a sub valve port formed in the main valve body, wherein a sub valve chamber that accommodates the sub valve body is formed in the main valve body, a silencing member is provided on an inflow side and an outflow side of a fluid in the sub valve chamber, and a communication passage that communicates the inside and the outside of the sub valve chamber and a communication passage that communicates the main valve port and the sub valve port are provided in the vicinity of the silencing member independently of the silencing member.

According to the two-stage motor-operated valve of the present invention, the communication passage that communicates the inside and outside of the sub-valve chamber or/and the communication passage that communicates the main valve port and the sub-valve port are provided in the vicinity of the muffler. Therefore, even if foreign matter in the fluid accumulates in the muffler member, the fluid flows through the communication passage, and therefore, clogging of the flow passage can be avoided. That is, according to the two-stage motor-operated valve of the present invention, in the small flow rate control region, the silencing effect can be obtained by the silencing member thinning the bubbles in the fluid flowing in the inflow side or outflow side of the fluid in the sub-valve chamber or in the inflow side and outflow side of the fluid in the sub-valve chamber, and the clogging of the flow path can be avoided.

Here, the communication path is preferably configured to include a main spool side concave portion in which a part of the main spool is cut.

According to this configuration, since the communication passage is configured to include the main spool side concave portion having a stable shape in which a part of the main spool formed of a material having high rigidity is cut, clogging of the flow passage can be avoided with high stability.

Further, the communication path is preferably configured to include a muffler side concave portion formed by cutting a part of the muffler.

According to this configuration, for example, compared with a main valve core or the like, the communication passage is configured to include the muffler side concave portion in which a part of the muffler that is easy to process is cut, and therefore, the manufacturing cost required for forming the communication passage can be reduced.

Further, it is preferable that the communication path is located radially outside the sub-valve port from an axis of the main spool.

According to this structure, most of the flow from the sub-valve port passes through the silencing member in a state where foreign matter in the fluid is less accumulated in the silencing member, and therefore the silencing effect is not hindered.

Preferably, the main valve element has a covered cylinder portion that opens to the main valve port, the sub-valve port is provided in a covered portion of the covered cylinder portion, an annular holding portion that holds an outer peripheral portion of the silencing member is provided in an opening portion of the covered cylinder portion, and at least a part of the communication path is provided so as to pass between a part of the outer peripheral portion of the silencing member and an inner peripheral edge of the holding portion.

According to this configuration, for example, the communication passage is provided between the holder and the silencing member with a higher degree of freedom in shape setting at the time of design than the main valve element, and thus, the communication passage can be obtained with less trouble in shape study at the time of design.

Preferably, the main valve element has a covered cylinder portion that opens to the main valve port, the sub-valve port is provided in a cover portion of the covered cylinder portion, an annular holding portion that holds an outer peripheral portion of the silencing member is provided in an opening portion of the covered cylinder portion, and at least a part of the communication path is provided so as to pass between an outer peripheral edge of the holding portion and a part of an inner peripheral portion of the opening portion of the covered cylinder portion.

According to this configuration, since the communication passage is provided between the main valve body and the holding portion, which are formed of the materials having high rigidity, the stability of the shape and the like can be ensured, and the clogging of the flow path can be avoided with high stability.

In addition, a plurality of the communication paths are also preferably provided.

According to this configuration, even if one communication passage is blocked, the fluid can be made to pass through the other communication passage, and therefore, the accuracy of avoiding the blocking in the small flow rate control region can be improved.

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

According to the refrigeration cycle of the present invention, since the two-stage motor-operated valve of the present invention is provided in the fluid path, the silencing effect in the small flow rate control region can be obtained by the silencing member and the clogging of the flow path can be avoided.

The effects of the present invention are as follows.

According to the check valve and the refrigeration cycle of the present invention, the silencing effect in the small flow rate control region can be obtained by the silencing member, and the clogging of the flow path can be avoided.

Drawings

Fig. 1 is a longitudinal sectional view showing a two-stage motor-operated valve according to a first embodiment.

Fig. 2 is an enlarged cross-sectional view of a main portion of the two-stage motor-operated valve shown in fig. 1.

Fig. 3 is a plan view of the muffler component and the communication path shown in fig. 1 and 2, as viewed from the V11 direction in fig. 2.

Fig. 4 is a diagram showing a two-stage motor-operated valve according to a second embodiment in an enlarged cross section of the same main part as fig. 2.

Fig. 5 is a plan view of the muffler component and the communication path shown in fig. 2 as viewed from the V21 direction in fig. 4.

Fig. 6 is a diagram showing a modification of the first and second embodiments shown in fig. 1 to 5.

Fig. 7 is a diagram showing a two-stage motor-operated valve according to a third embodiment in an enlarged cross section of the same main part as fig. 2.

Fig. 8 is a plan view of the muffler component and the communication path shown in fig. 7, as viewed from the V31 direction in fig. 7.

Fig. 9 is a diagram showing a two-stage motor-operated valve according to a fourth embodiment in an enlarged cross section of the same main part as fig. 2.

Fig. 10 is a plan view of the muffler component and the communication path shown in fig. 9, as viewed from the V41 direction in fig. 9.

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

In the figure: 1-valve housing, 2',2",2 '" -main valve core, 2C-auxiliary valve seat, 3-auxiliary valve core, 4-driving part, 5', 6' -silencing element, 10, 10',10 ' -secondary electric valve, 11-primary connector pipe, 12-secondary connector pipe, 13-main valve seat, 14-main valve port, 21, 21',21",21 '" -a main valve portion (capped cylinder portion), 21a ' "-a first stepped recess, 21b '" -a second stepped recess, 21C-a holding portion, 21d ',21e ' "-a communication path, 24-a secondary valve port, 25, 25 '" -a communication hole, 90-a refrigeration cycle system, L-axis.

Detailed Description

A two-stage motor-operated valve according to an embodiment of the present invention will be described. First, a first embodiment will be described with reference to fig. 1 to 3.

Fig. 1 is a longitudinal sectional view showing a two-stage motor-operated valve according to a first embodiment, fig. 2 is an enlarged sectional view of a main portion of the two-stage motor-operated valve shown in fig. 1, and fig. 3 is a plan view of the muffler component and the communication path shown in fig. 1 and 2, as viewed from a direction V11 in fig. 2. The concept of "up and down" in the following description corresponds to up and down in the drawings of fig. 1 and 2.

The two-stage motor-operated valve 10 of the present embodiment includes a valve housing 1, a main valve body 2, a sub valve body 3, and a driving unit 4.

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

The main valve body 2 is a part for opening and closing the main valve port 14, and includes a valve body main portion 2A having a main valve portion 21 that is seated on or unseated from the main valve seat 13, a stopper portion 2B, and a sub valve seat 2C, as shown in fig. 2. The valve element 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 secondary valve port 24 penetrating the secondary valve seat 2C along the axis L. A plurality of communication holes 25 are formed in the peripheral surface portion of the cylindrical portion 22, and the sub-valve chamber 23 communicates with the main valve chamber 1C through the communication holes 25. An insertion hole 26 along the axis L is formed in the inner peripheral surface of the cylindrical portion 22 of the valve body main portion 2A, and the sub valve base portion 3A of the sub valve body 3 is inserted into the insertion hole 26. The stopper portion 2B is formed in an annular shape and fixed to the upper end portion of the valve body main portion 2A, and a rotor shaft 46 is inserted therein to regulate the rising position of the sub valve body 3 provided at the lower end of the rotor shaft 46. A stepped shape is formed from the upper end portion to the lower side of the valve body main portion 2A, and a main valve spring 27 is disposed between the stepped shape and the top surface of the support member 1B. The main valve body 2 is biased in the main valve seat 13 direction (closing direction) by the main valve spring 27.

The sub valve element 3 is a part for changing the opening degree of the sub valve port 24 formed in the main valve element 2. The sub valve body 3 is composed of a cylindrical sub valve base portion 3A, a sub valve portion 3B protruding downward from the sub valve base portion 3A, a thrust washer 3C provided on the upper side of the sub valve base portion 3A, and a sub valve spring (not shown) provided inside the sub valve base portion 3A. The sub-valve base 3A is inserted into the insertion hole 26 of the main valve element 2, and is supported so as to be movable in the vertical direction along the axis L and rotatable about the axis L. The thrust washer 3C can abut against the upper surface of the sub valve base 3A and the lower surface of the stopper portion 2B, and the friction force between the abutting surfaces becomes extremely small. An insertion hole is provided in an upper portion of the sub valve base portion 3A to allow the rotor shaft 46 to be inserted therethrough, and a sub valve spring is disposed between a flange portion (not shown) formed at a lower end portion of the rotor shaft 46 and an upper end portion of the sub valve portion 3B joined to a bottom portion of the sub valve base portion 3A. By this sub valve spring, the sub valve element 3 is biased in the sub valve seat 2C direction (closing direction) with respect to the rotor shaft 46 (magnetic rotor 44). In this case, the sub-valve base 3A may be formed in a solid shape, and the sub-valve spring may be omitted.

The driving unit 4 is a portion that advances and retreats in the axis L direction of the sub valve body 3, and also advances and retreats the main valve body 2 in the axis L direction via the sub valve body 3. The driving unit 4 includes a stepping motor 41 as a driving source, a screw feed mechanism 42 for advancing and retreating the sub-valve body 3 by rotation of the stepping motor 41, and a stopper mechanism 43 for restricting rotation of the stepping motor 41. The stepping motor 41 includes: a magnetic rotor 44 whose outer peripheral portion is magnetized to a plurality of poles; a stator coil 45 disposed on the outer periphery of the housing 18; and a rotor shaft 46 fixed to the magnetic rotor 44. The rotor shaft 46 is fixed to the magnetic rotor 44 via a fixing member 46a, and extends along the axis L, with an upper end portion thereof inserted into a guide 47 of the stopper mechanism 43. A male screw portion 46B is integrally formed in the intermediate portion of the rotor shaft 46, and the male screw portion 46B is screwed with the female screw portion 17 of the support member 1B, thereby constituting the screw feed mechanism 42. When the magnetic rotor 44 rotates, the male screw portion 46b of the rotor shaft 46 is guided by the female screw portion 17, whereby the magnetic rotor 44 and the rotor shaft 46 move forward and backward in the direction of the axis L, and the sub valve element 3 also moves up or down along the axis L.

The stopper mechanism 43 includes a cylindrical guide 47 hanging from the top of the housing 18, a spiral guide wire body 48 fixed to the outer periphery of the guide 47, and a movable slider 49 rotatably and vertically movable guided by the guide wire body 48. The movable slider 49 is provided with a claw portion 49a protruding radially outward, and the magnetic rotor 44 is provided with an extension portion 44a extending upward and abutting the claw portion 49 a. When the magnetic rotor 44 rotates, the extension 44a presses the claw 49a, and the movable slider 49 thereby rotates and moves up and down in conformity with the guide wire body 48. An upper end stopper 48a defining the uppermost position of the magnetic rotor 44 and a lower end stopper 48b defining the lowermost position of the magnetic rotor 44 are formed on the guide wire body 48. By the movable slider 49 coming into contact with these upper end stopper 48a and lower end stopper 48b, the rotation of the movable slider 49 is stopped, and thereby the rotation of the magnetic rotor 44 is restricted, and the raising and lowering of the sub-valve body 3 are also stopped.

In general, the two-stage motor-operated valve 10 configured as described above operates as follows. First, the main valve portion 21 of the main spool 2 of the two-stage motor-operated valve 10 is seated on the main valve seat 13, and the main valve port 14 is in a closed valve state. Fig. 1 and 2 show the two-stage motor-operated valve 10 in the closed state. In the two-stage motor-operated valve 10 of fig. 1 and 2, the sub valve element 3 is positioned closest to the sub valve port 24. At this time, the sub valve body 3 is not seated on the sub valve seat 2C, but a flow path is formed through a gap between the outer peripheral surface of the sub valve portion 3B of the sub valve body 3 and the inner peripheral surface of the sub valve port 24. Therefore, the fluid flowing from the primary joint pipe 11 into the main valve chamber 1C flows into the sub valve chamber 23 through the communication hole 25 of the valve body main portion 2A. The fluid flowing into the sub valve chamber 23 flows into the lower part of 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 is zero (the position of the sub-valve portion 3B is the lowest end), a minute flow rate is generated.

Then, the stepping motor 41 of the driving unit 4 is driven to rotate the magnetic rotor 44 to raise the sub valve body 3, so that the sub valve portion 3B of the sub valve body 3 is raised inside the sub valve port 24, and the flow path generated by the gap between the sub valve portion 3B and the sub valve port 24 is enlarged, and the flow rate gradually increases. At this time, the main valve portion 21 of the main valve spool 2 remains seated on the main valve seat 13, and therefore, the increase in flow rate is small. In this way, the control region in which the opening degree of the sub valve element 3 is changed in the state where the main valve element 2 is closed is a small flow rate control region. When the sub valve body 3 is further lifted, the thrust washer 3C comes into contact with 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 unseated from the main valve seat 13. The control region in which the opening degree of the main valve port 14 is changed by unseating the main valve element 2 in this manner is a large flow rate control region in which the change in flow rate is large, and the flow rate is maximum in the fully open state in which the main valve element 2 is farthest from the main valve port 14.

Here, in the two-stage motor-operated valve 10 of the present embodiment, in order to suppress the sound of passage when the fluid passes through the narrow portion such as the gap between the sub-valve port 24 and the sub-valve portion 3B of the sub-valve body 3 in the small flow rate control region, the following silencing member 5 is provided.

The silencing member 5 is formed in a circular plate shape from a porous material, a metal mesh, or the like, 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 capped cylinder portion that opens toward the main valve port 14, and a cap portion of the capped cylinder portion is a sub valve seat 2C, and a sub valve port 24 coaxial with the axis of the main valve body 2 is provided in the cap portion. The silencing member 5 is fitted into a cylindrical first stepped recess 21a provided in an opening portion of the main valve portion 21. Further, an annular holding portion 21c is fitted into a shallow cylindrical second stepped recess 21b provided in a large diameter at a position closer to the main valve port 14 than the first stepped recess 21a is, in an opening portion of the main valve portion 21. The outer peripheral portion of the muffler member 5 is held by the holding portion 21c so that the muffler member 5 does not fly out of the first stepped recess 21 a.

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 control region passes through the silencing member 5 while being directed toward the main valve port 14. At this time, the bubbles in the fluid are subdivided by the silencer 5 made of a porous material, a metal mesh, or the like, and the passing sound of the fluid is suppressed by the subdivision.

In the two-stage motor-operated valve 10 of the present embodiment, a communication path 21d that communicates the main port 14 and the sub-port 24 is provided near the muffler 5. The communication passage 21d serves as a main valve element side concave portion formed by cutting a part of the main valve element 2, specifically, a part of the inner peripheral surface of the main valve portion 21 into a semi-cylindrical shape. The communication path 21d is formed by cutting deeper than the second stepped recess 21b of the fitting holder 21c in the outer diameter direction of the main valve portion 21 having a closed cylindrical shape and deeper than the first stepped recess 21a of the fitting muffler 5 in the axial direction. Thus, the communication passage 21d is provided so that a part of the main valve port 14 passes between the outer peripheral edge of the holding portion 21c and a main spool-side concave portion that is a part of the inner peripheral portion of the opening portion of the main valve portion 21.

According to the two-stage motor-operated valve 10 of the present embodiment, the communication path 21d that communicates the main port 14 and the sub-port 24 is provided in the vicinity of the muffler 5. Therefore, even if foreign matter in the fluid accumulates in the muffler member 5, the fluid flows through the communication passage 21d, and therefore, clogging of the flow path can be avoided. That is, according to the present embodiment, the silencing effect in the small flow rate control region can be obtained by the silencing member 5, and the clogging of the flow path can be avoided.

Here, in the present embodiment, the communication passage 21d is a main spool side concave portion in which a part of the main spool 2 is cut. According to this structure, since the communication passage 21d is configured as a stable main spool side concave portion such as a shape in which a part of the main spool 2 formed of a material having high rigidity is cut, clogging of the flow path can be avoided with high stability.

In the present embodiment, the communication path 21d is disposed radially outward of the sub-valve port 24. According to this structure, in a state where foreign matter in the fluid is less deposited on the silencing member 5, most of the fluid from the sub-valve port 24 toward the main valve port 14 passes through the silencing member 5, and therefore the silencing effect is not hindered.

In the present embodiment, the main valve element 2 has a main valve portion 21 as a covered cylinder portion that opens to the main valve port 14, the auxiliary valve port 24 is provided in the covered portion, and an annular holding portion 21c that holds the outer peripheral portion of the silencing member 5 is provided in the opening portion of the main valve portion 21. A part of the communication path 21d is provided so as to pass through 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. According to this structure, since the communication passage 21d is provided between the main valve element 2 and the holding portion 21c, which are formed of the materials having high rigidity, stability of the shape and the like thereof can be ensured, and clogging of the flow path can be avoided with high stability.

The communication path of the first embodiment illustrates a main spool-side concave portion formed by cutting a part of the inner peripheral surface of the main valve portion 21 into a semi-cylindrical shape, but the shape of the main spool concave portion is not limited thereto.

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

Fig. 4 is a view showing a two-stage motor-operated valve according to the second embodiment in an enlarged cross section of the same main portion as fig. 2, and fig. 5 is a plan view of the muffler component and the communication path shown in fig. 2 as viewed from the V21 direction in fig. 4. The concept of "up and down" in the following description corresponds to up and down in fig. 4. In fig. 4 and 5, the same components as those of the two-stage motor-operated valve 10 according to the first embodiment shown in fig. 1 to 3 are denoted by the same reference numerals as those in fig. 1 to 3, and repetitive description of these same components will be omitted.

The two-stage motor-operated valve 10 'according to the second embodiment is different from the first embodiment in the shape of each of the first stepped recess 21a' and the second stepped recess 21b 'of the silencing member 5' and the communication passage 21d 'attached to the opening portion of the silencing member 5' and the main valve portion 21 'of the main valve body 2'.

In the present embodiment, the communication passage 21D 'is formed as a muffler side concave portion formed by cutting a part of the outer periphery of the muffler 5' into a D-cut shape. On the other hand, the inner peripheral portion of the opening portion of the main valve portion 21' is not cut, and the first step recess 21a ' and the second step recess 21b ' are formed over the entire circumference. Thus, a part of the communication passage 21D 'on the main valve port 14 side is provided so as to pass through a space between the D-cut portion, which is a part of the outer peripheral portion of the silencing member 5', and the inner peripheral edge of the holding portion 21c.

Of course, the secondary-type electric valve 10 'according to the second embodiment described above can obtain the silencing effect in the small flow rate control region by the silencing member 5' and can avoid clogging of the flow path, similarly to the secondary-type electric valve 10 according to the second embodiment described above.

Here, in the present embodiment, the communication path 21d 'is a muffler side concave portion formed by cutting a part of the muffler 5'. According to this structure, for example, compared with the main valve body 2', the communication passage 21d' is configured as a muffler side concave portion formed by cutting a part of the muffler 5 'that is easy to process, and therefore, the manufacturing cost required for forming the communication passage 21d' can be reduced.

In the present embodiment, the communication path 21d' is disposed radially outward of the sub-valve port 24. According to this structure, as in the case of the two-stage motor-operated valve 10 of the first embodiment, most of the fluid flowing from the sub-valve port 24 to the main valve port 14 passes through the silencing member 5 'in a state where foreign matter in the fluid is less deposited on the sound member 5', and therefore the silencing effect is not hindered.

In the present embodiment, at least a part of the communication path 21d 'is provided so as to pass through between a part of the outer peripheral portion of the muffler 5' and the inner peripheral edge of the holding portion 21c. According to this configuration, for example, the communication passage 21d 'is provided between the muffler 5' and the retainer 21c, which has a higher degree of freedom in setting the shape at the time of design, than the main valve body 2', and thus, the communication passage 21d' can be obtained with less trouble in shape study at the time of design.

The communication path according to the second embodiment is exemplified by the muffler component side concave portion formed by cutting a part of the outer periphery of the muffler component 5' into a D-cut shape, but the shape of the muffler component side concave portion is not limited to this.

Next, a modification of the first and second embodiments will be described with reference to fig. 6.

Fig. 6 is a diagram showing a modification of the first and second embodiments shown in fig. 1 to 5. The modification shown in fig. 6 is an example in which the number of communication paths 21d,21d' is increased in the first and second embodiments, and fig. 6 (a) shows the first modification and fig. 6 (B) shows the second modification. In fig. 6, the same reference numerals as those in fig. 1 to 5 are used for the same components as those in the first and second embodiments shown in fig. 1 to 5, and a repetitive description of these same components is omitted.

In the first modification of fig. 6 (a), the communication paths 21d in the first embodiment are provided at two positions symmetrical to each other across the axis L. That is, in the present modification, the inner peripheral portion of the opening portion of the main valve portion 21 is cut at the two places to form two communication passages 21d.

In the second modification of fig. 6 (B), the communication paths 21d' in the second embodiment are provided at two positions symmetrical to each other across the axis L. That is, in the present modification, the outer peripheral edge of the muffler member 5 'is cut at the two positions to form two communication passages 21d'.

Of course, in any of the first and second modifications described above, the silencing effect in the small flow rate control region can be obtained by the silencing members 5,5' as in the second embodiment described above, and the clogging of the flow path can be avoided.

Here, in the first and second modification examples, a plurality of (specifically, two) communication passages 21d,21d' are provided. According to this configuration, even when one communication passage 21d,21d 'is blocked, the fluid can be made to pass through the other communication passage 21d,21d', and therefore, the accuracy of avoiding clogging in the small flow rate control region can be improved.

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

Fig. 7 is a view showing a secondary-type motor-operated valve according to a third embodiment in an enlarged cross section of the same main portion as fig. 2, and fig. 8 is a plan view of a silencing member and a communication path provided in an upper cylinder of the main valve body shown in fig. 7, as viewed from the direction V31 in fig. 7. The concept of "up and down" in the following description corresponds to up and down in fig. 7. In fig. 7 and 8, the same components as those of the two-stage motor-operated valve 10 according to the first embodiment shown in fig. 1 to 3 are denoted by the same reference numerals as those in fig. 1 to 3, and repetitive description of these same components will be omitted.

In the two-stage motor-operated valve 10″ according to the third embodiment, the structure for fixing the silencing member 5 between the sub-valve port 24 and the main valve port 14 and the communication path 21d in the vicinity thereof are the same as those of the first embodiment. The difference from the first embodiment is that the muffler component 6 and the communication path 21e described below are provided in addition to the muffler component 5 and the communication path 21d of the first embodiment. Specifically, as shown in fig. 7 and 8, a communication passage 21e is formed by cutting a part of the inner peripheral surface of the communication hole 25 "into a semi-cylindrical shape parallel to the axis of the communication hole 25", by press-fitting or the like a silencing member 6 formed into a cylindrical shape from a porous material, a metal mesh or the like into the communication hole 25 "provided in the main valve portion 21" of the main valve body 2 "and communicating the sub valve chamber 23 and the main valve chamber 1C. The communication passage 21e also serves as a main valve side concave portion.

According to the two-stage motor-operated valve 10″ of the present embodiment, in addition to the silencing effect when the refrigerant flows from the sub-valve port 24 to the main valve port 14 and the occlusion avoidance effect of the silencing member 5, the following effects can be obtained: when the refrigerant flows from the main valve chamber 1C to the sub valve chamber 23, the noise reduction effect due to the thinning of the bubbles in the refrigerant in the noise reduction member 6 and the clogging due to the accumulation of foreign matter in the noise reduction member 6 are avoided through the communication passage 21e.

In the present embodiment, the structure in which the silencing member 6 and the communication passage 21e are provided as in the main valve element 2″ is exemplified in addition to the first embodiment, but the silencing effect is slightly reduced, but the reduction in the number of components is advantageous in terms of the processing time and the assembly time, so that the silencing member 5 and the communication passage 21d may not be provided between the main valve port 14 and the sub-valve port 24, and only the silencing member 6 and the communication passage 21e may be provided as in the main valve element 2″. Although the communication path 21e is exemplified as a semicircular cutout, the shape of the communication path 21e is not limited to this.

In the present embodiment, modification 1 corresponding to the first embodiment may be applied.

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

Fig. 9 is a view showing a two-stage motor-operated valve according to the fourth embodiment in an enlarged cross section of the same main portion as fig. 2, and fig. 10 is a plan view of a silencing member and a communication path provided in an upper cylinder of the main valve body shown in fig. 9, as viewed from the direction V41 in fig. 7. The concept of "up and down" in the following description corresponds to up and down in fig. 9. In fig. 9 and 10, the same components as those of the second embodiment of the two-stage motor-operated valve 10' shown in fig. 4 and 5 are denoted by the same reference numerals as those of fig. 4 and 5, and a repetitive description of these same components is omitted.

The structure of fixing the silencing member 5' between the secondary port 24 and the primary port 14 of the secondary-stage motor-operated valve 10' "of the fourth embodiment and the communication path 21d ' in the vicinity thereof are the same as those of the second embodiment. The difference from the second embodiment is that the following silencing member 6 'and communication passage 21e' are provided in addition to the silencing member 5 'and communication passage 21d' of the second embodiment. Specifically, as shown in fig. 9 and 10, a sound-deadening member 6' formed in a cylindrical shape from a porous material, a metal mesh, or the like and having a part of its outer periphery cut into a D-cut shape is fitted by press fitting or the like into a communication hole 25 provided in a main valve portion 21' "of a main valve body 2 '" and communicating the sub valve chamber 23 with the main valve chamber 1C, and a gap between an inner peripheral surface of the communication hole 25 and a D-cut surface of the sound-deadening member 6' is formed as a communication passage 21e '. The D-cut portion of the muffler member 6' is a muffler member side concave portion.

According to the two-stage motor-operated valve 10 '"of the present embodiment, in addition to the silencing effect when the refrigerant of the second embodiment flows from the sub-valve port 24 to the main valve port 14 and the occlusion avoidance effect of the silencing member 5', the following effects can be obtained: when the refrigerant flows from the main valve chamber 1C to the sub valve chamber 23, the noise reduction effect due to the thinning of the bubbles in the refrigerant in the noise reduction member 6' and the clogging due to the accumulation of foreign matter in the noise reduction member 6' are avoided through the communication passage 21e '.

In the present embodiment, in addition to the second embodiment, the structure in which the silencing member 6 'and the communication passage 21e' are provided like the main valve body 2 '"is exemplified, and although the silencing effect is slightly small, the structure is advantageous in terms of the number of parts, and the processing and the assembling steps, and therefore, the silencing member 5' and the communication passage 21d 'may not be provided between the main valve port 14 and the sub-valve port 24, and only the silencing member 6' and the communication passage 21e 'may be provided like the main valve body 2'". Further, although the structure in which a part of the outer periphery of the muffler member 6 'is cut into the D-cut shape is exemplified, the shape of the muffler member 6' is not limited to this, and various shapes of grooves and holes may be provided on the outer periphery.

In the present embodiment, the second modification corresponding to the second embodiment described above may be applied.

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

The refrigeration cycle system 90 shown in fig. 11 is used in, for example, an air conditioner such as a household air conditioner. The two-stage type electric valves 10, 10 '"and modifications thereof (hereinafter, simply referred to as the two-stage type electric valves 10 to 10'") of the respective embodiments described above are provided between a first indoor side heat exchanger 91 (operating as a cooler for dehumidification) and a second indoor side heat exchanger 92 (operating as a heater for dehumidification) of the air conditioner. The two-stage motor-operated valves 10 to 10' "together with the compressor 95, the four-way valve 96, the outdoor side heat exchanger 94 and the electronic expansion valve 93 constitute a heat pump refrigeration cycle. The first indoor heat exchanger 91, the second indoor heat exchanger 92, and the two-stage motor-operated valves 10 to 10' "are provided indoors, and the compressor 95, the four-way valve 96, the outdoor heat exchanger 94, and the electronic expansion valve 93 are provided outdoors, thereby constituting a cooling/heating device.

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

According to the refrigeration cycle system 90, the two-stage motor-operated valves 10 to 10' according to the present invention are provided in the fluid path. Therefore, in the refrigeration cycle 90, it is possible to obtain the silencing effect in the small flow rate control region by the silencing members 5,5', and to avoid clogging of the flow path.

The first to fourth embodiments, the first and second modifications described above are merely representative embodiments of the present invention, and the present invention is not limited thereto. That is, the present invention can be variously modified and implemented within a range not departing from the gist of the present invention. According to this modification, it is needless to say that the configuration of the two-stage motor-operated valve according to the present invention is included in the scope of the present invention.

For example, in the first to fourth embodiments and the first and second modifications described above, the two-stage motor-operated valves 10 to 10' "used in air conditioners such as home air conditioners are exemplified. However, the two-stage motor-operated valve is not limited to a household air conditioner, but may be a service air conditioner, and may be applied to various refrigerators, freezers, and the like.

In the first to fourth embodiments, the first and second modifications described above, the communication paths 21d and 21e as the main spool side concave portion in which a part of the main spool 2 is cut, the communication path 21d 'as the muffler side concave portion in which a part of the muffler 5' is cut, and the communication path 21e 'as the muffler side concave portion in which a part of the muffler 6' is cut are exemplified as one example of the communication paths. However, the communication passage is not limited to this, and the specific form thereof is not limited as long as it is a communication passage formed in the vicinity of the silencing member so as to communicate the inside and outside of the sub valve chamber or to communicate the main valve port and the sub valve port. However, by forming the communication passages 21d,21 e as main spool side concave portions in which a part of the main spool 2 is cut, it is possible to avoid clogging of the flow path with high stability, as described above. In addition, by forming the communication passage 21d 'as the muffler component side concave portion in which a part of the muffler component 5' is cut, and forming the communication passage 21e 'as the muffler component side concave portion in which a part of the muffler component 6' is cut, the manufacturing cost of forming the communication passages 21d ',21 e' can be reduced, as described above. Here, the communication passages are not limited to the communication passages 21d and 21e formed only by the main spool side concave portion, but are not limited to the communication passages 21d 'and 21e' formed only by the muffler side concave portion. The communication path may be configured to include the main valve element side concave portion or the muffler component side concave portion, or may be configured to have both of these concave portions.

In the first and second modifications described above, a plurality of, specifically, two communication paths 21d and 21d' are exemplified as an example of the communication paths. However, as in the first and second embodiments described above, the number of communication paths 21d,21d' may be one. However, by providing a plurality of communication passages 21d,21d', the accuracy of clogging avoidance in the small flow rate control region can be improved, as described above. In addition, even in the case where a plurality of communication paths are provided, the number thereof is not limited to two, and three or more may be provided. The formation position is not limited to the position symmetrical to each other as in the first and second modifications described above, and may be formed at any position. In addition, a plurality of communication paths of the same kind may not be provided as in the first modification and the second modification, and different kinds of communication paths may be provided in a mixed manner. Of course, the above also applies to the communication paths 21e,21e' of the third and fourth embodiments.

In the first embodiment and the first modification, the communication passage 21d provided so as to pass through 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 is exemplified as an example of the communication passage. In the second embodiment and the second modification, the communication passage 21d 'provided so as to pass through a portion of the outer peripheral portion of the muffler member 5' and the inner peripheral edge of the holding portion 21c is exemplified as an example of the communication passage. However, the communication path is not limited to these, and any route may be set. 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, it is possible to avoid clogging of the flow path with high stability, as described above. Further, by providing the communication passage 21d 'so as to pass through between a part of the outer peripheral portion of the muffler member 5' and the inner peripheral edge of the holding portion 21c, it is possible to obtain the communication passage while suppressing the trouble of shape study at the time of design.

In the first to fourth embodiments and the first and second modifications described above, the description has been made of the refrigerant flowing in from the primary joint pipe 11 and flowing out from the secondary joint pipe 12, but the present invention is not limited to this unidirectional flow, and the present invention can be applied to a case where the refrigerant flows in from the secondary joint pipe 12 and flows out from the primary joint pipe 11, and in particular, a case where the reverse flow is performed in a fully opened state.

Claims

1. A two-stage electric valve is characterized in that,

the device is provided with:

a main valve element that opens and closes a main valve port; and

a sub valve element for changing the opening of a sub valve port formed in the main valve element,

a secondary valve chamber for accommodating the secondary valve core is formed in the primary valve core,

a communication hole for communicating the inside and the outside of the auxiliary valve chamber is formed at the inflow side of the fluid of the auxiliary valve chamber,

at least on the outflow side of the fluid in the secondary valve chamber, a silencing member is provided,

a communication path that communicates the main valve port and the auxiliary valve port is provided in the vicinity of the silencing member independently of the silencing member,

the communication path is located radially outside the auxiliary valve port from an axis of the main spool, and a portion of the silencing member is located radially inside the auxiliary valve port from an axis of the main spool.

2. A two-stage electric valve is characterized in that,

the device is provided with:

a main valve element that opens and closes a main valve port; and

a silencing member is provided at least in the interior of the communication hole of the sub-valve chamber,

a communication path is provided in the vicinity of the silencing member, independently of the silencing member, for communicating the interior and the exterior of the sub-valve chamber.

3. A two-stage electric valve is characterized in that,

the device is provided with:

a main valve element that opens and closes a main valve port; and

a silencing member is provided inside the communication hole of the sub valve chamber,

and a silencing member is provided on the outflow side of the fluid in the sub-valve chamber,

in the vicinity of the silencing member, a communication passage that communicates the inside and outside of the secondary valve chamber and a communication passage that communicates the primary valve port and the secondary valve port are provided independently of the silencing member.

4. A two-stage motor-operated valve as set forth in any one of claims 1 to 3, wherein,

the communication path is configured to include a main spool side concave portion in which a part of the main spool is cut.

5. A two-stage motor-operated valve as set forth in any one of claims 1 to 3, wherein,

the communication path is configured to include a muffler side concave portion formed by cutting a part of the muffler.

6. The two-stage motor-operated valve as set forth in claim 3, wherein,

the communication path is located radially outside the auxiliary valve port from the axis of the main valve core.

7. A two-stage motor-operated valve as set forth in any one of claims 1 to 3, wherein,

the main valve core has a covered cylinder portion which opens toward the main valve opening, the auxiliary valve port is provided in a cover portion of the covered cylinder portion, an annular holding portion which holds an outer peripheral portion of the silencing member is provided in an opening portion of the covered cylinder portion,

at least a part of the communication path is provided so as to pass between a part of the outer peripheral portion of the muffler component and an inner peripheral edge of the retainer.

8. A two-stage motor-operated valve as set forth in any one of claims 1 to 3, wherein,

at least a part of the communication path is provided so as to pass between an outer peripheral edge of the holding portion and a part of an inner peripheral portion of the opening portion of the capped tube portion.

9. A two-stage motor-operated valve as set forth in any one of claims 1 to 3, wherein,

a plurality of the communication paths are provided.

10. A refrigeration cycle system, characterized in that,

a two-stage motor-operated valve according to any one of claims 1 to 9 disposed in a fluid path.