JP3951983B2 - Refrigerant control valve - Google Patents

Description

  The present invention relates to a refrigerant control valve, for example, a refrigerant control valve used as an expansion device for dehumidification in an air conditioner having a dehumidifying function.

  Some air conditioners enable dehumidifying operation in addition to cooling operation and heating operation. In order to enable this dehumidifying operation, the indoor heat exchanger is divided into two parts, a refrigerant control valve is connected between them, and this refrigerant control valve is fully opened during cooling operation or heating operation. Control is performed so that the throttle is closed (valve closed). That is, by controlling the refrigerant control valve disposed at the intermediate position of the two divided indoor heat exchangers as described above and reversibly switching the refrigerant circuit, the entire indoor heat exchanger is cooled during cooling operation. Acts as a control valve evaporator, causes the entire indoor heat exchanger to function as a condenser during heating operation, and causes the upstream indoor heat exchanger to function as a condenser during dehumidification operation, and also serves as a downstream indoor heat exchanger Is functioning as an evaporator. In such an air conditioner, when the upstream side of the refrigerant control valve is in a gas-liquid two-layer flow during the dehumidifying operation, liquid refrigerant and gas refrigerant flow alternately and irregularly in the closed refrigerant control valve in the throttled state. As a result, the refrigerant flow pulsates, and there is a problem that a continuous or discontinuous unpleasant refrigerant passing sound is generated. Normally, since the expansion valves for cooling and heating are installed in the outdoor unit, such refrigerant passing noise in the refrigerant throttle is not a problem.

  In view of this, a porous body made of a porous material is provided before and after the throttle passage in the refrigerant control valve. The porous body on the upstream side of the throttle passage refines the bubbles contained in the refrigerant, rectifies (homogenizes) the flow of the refrigerant containing the bubbles, and reduces discontinuous refrigerant passing sound flowing through the throttle passage. Further, the porous body on the downstream side of the throttle passage absorbs the energy of the refrigerant jet after decompression and reduces continuous refrigerant passing sound. In addition, since solid contaminants (sludge etc.) called contamination exist in the refrigerant flow, the porous material becomes clogged with the porous material during long-term use, and the refrigerant flow rate changes and the rectification effect decreases. This causes a problem.

  In order to remedy this problem, a refrigerant control valve in which a filter is incorporated on the inlet side of the porous body during the dehumidifying operation has been developed in the refrigerant control valve. One type of such a refrigerant control valve will be described with reference to FIG.

  FIG. 12 is a cross-sectional view of the refrigerant control valve 101 that is currently on the market and shows a closed state. In FIG. 12, the solid arrow indicates the direction of the refrigerant flow when the refrigerant control valve 101 is closed.

  In the refrigerant control valve 101, refrigerant inlets and outlets 102 and 103 are arranged on two orthogonal surfaces of the valve box 101a. The refrigerant inlet / outlet 102 is a refrigerant inlet during the dehumidifying operation and the cooling operation, and the refrigerant inlet / outlet 103 is a refrigerant inlet during the heating operation. A valve seat 104 is formed between the two refrigerant inlets and outlets 102 and 103. A valve hole 105 is formed in the central portion of the valve seat 104. A cylindrical valve rod 106 reciprocates with respect to the valve seat 104, and the valve hole 105 is opened and closed by the tip of the valve rod 106 coming into contact with the valve seat 104. A throttle passage 107 is formed in the valve rod 106. Cavities 107a and 107b are provided in front and rear of the throttle passage 107, and disc-shaped porous bodies 108 made of a porous material are provided in front and rear of the cavities 107a and 107b. 109 is arranged. A support plate 110 that supports the porous body 109 is provided at the tip of the valve stem 106, and the support plate 110 is provided with a plurality of openings 110 a for communicating the throttle passage 107 with the valve hole 105. Yes.

  In the above configuration, the cavity 107a on the upstream side of the throttle passage 107 has a narrow passage area due to the overlapping state of the porous body 108 and the throttle passage, and prevents sludge from clogging in this narrow passage area. It is.

  Further, a recess is provided on the outer peripheral side of the valve stem 106, and a cylindrical filter 110 is disposed in this recess. In this way, the outer periphery of the filter 110 is formed to be substantially the same as the outer periphery of the valve stem 106. Further, the filter 110 is formed so that one end is on the side portion of the porous body 108 on the counter valve seat side and the other end extends in the direction from the side portion of the porous body 108 to the counter valve seat side (that is, the anti-tip side). ing. By forming in this way, the length of the filter 110 in the valve axis direction is longer than the thickness of the porous body 108. A refrigerant passage 113 communicating with the refrigerant inlet / outlet 102 is formed between the filter 110 and the inner wall of the valve box 101a.

  In addition, a communication path 112 that communicates the porous body 108 and the valve seat side (the refrigerant inlet / outlet 102 side) of the filter 110 is disposed in the radial direction in the vicinity of the counter valve seat side end surface 108a of the porous body 108.

  The refrigerant control valve 101 configured as described above has one refrigerant inlet / outlet 102 through the valve hole 105 at the time of valve opening when the tip of the valve rod 106 is separated from the valve seat 104, that is, at the time of cooling operation and heating operation. It communicates directly with the other refrigerant inlet / outlet 103. Therefore, the refrigerant flowing in from the refrigerant inlet / outlet 102 (or the refrigerant inlet / outlet 103) flows through the valve hole 105 to the other refrigerant inlet / outlet 103 (or the refrigerant inlet / outlet 102).

  In addition, the refrigerant control valve 101 has a valve hole 105 that is closed at the tip of the valve stem 106 when the valve stem 106 is closed when the tip of the valve stem 106 is in close contact with the valve seat 104, that is, during a dehumidifying operation. , The opening 109, the porous body 109, the throttle passage 107, the porous body 108, the communication passage 112, the filter 110, and the refrigerant passage 113 are communicated with the refrigerant inlet / outlet 102. Therefore, the refrigerant flowing in from the refrigerant inlet / outlet 102 passes through the refrigerant passage 113, the contaminants are removed by the filter 110, and rectified by the upstream porous body 108 through the communication passage 112. The rectified refrigerant expands in the throttle passage 107, the refrigerant jet energy is absorbed in the other porous body 109, and flows to the other refrigerant inlet / outlet 103 through the opening 109. As described above, the filter 110 is provided on the upstream side of the porous bodies 108 and 109 and the throttle passage 107 in order to prevent contaminants from flowing into the porous bodies 108 and 109 and the throttle passage 107 and clogging. Yes.

  In the refrigerant control valve 101 configured as described above, during the dehumidifying operation, the refrigerant flow rate in the vicinity of the communication passage 112 on the surface of the filter 110 on the refrigerant passage 113 side increases, and this portion is easily clogged with contaminants. Therefore, in the refrigerant control valve 101 described above, the length of the filter 110 in the valve axis direction is longer than the thickness of the porous body 108. By configuring the filter 110 in this way, even if the vicinity of the communication passage 112 on the surface on the refrigerant passage 113 side is clogged, the refrigerant flow can be obtained from other portions on the surface on the refrigerant passage 113 side that is not clogged. It is configured.

  However, in the refrigerant control valve 101 configured as described above, since the thickness of the porous body 108 in the valve shaft direction is thin when the valve is closed (that is, during the dehumidifying operation), a problem that the rectifying effect in the porous body 108 cannot be sufficiently obtained. was there. For this reason, the room for improvement for reducing the refrigerant | coolant passage sound in this refrigerant | coolant control valve was left.

  The present invention has been made in view of such problems in the prior art, and at the time of valve closing, a refrigerant control valve that further improves the rectifying effect of the refrigerant by the porous body and further reduces the refrigerant passing sound. The purpose is to provide.

  The first aspect of the present invention includes two refrigerant inlets / outlets, a valve seat formed between the two refrigerant inlets / outlets, a valve hole formed in the valve seat, and a reciprocating motion with respect to the valve seat, the tip portion of the valve seat Formed at the tip of the valve stem, a valve rod that opens and closes the valve hole by contacting and disconnecting, a throttle passage formed in the valve stem, two porous bodies made of a porous material arranged before and after the throttle passage, and The throttle passage is extended in the valve seat side direction from the position near the counter valve seat side end surface of the porous body on the counter valve seat side along the outer periphery of the valve rod, and the opening communicating with the tip side of the valve stem The filter, the refrigerant passage formed along the outer peripheral surface of the filter in communication with one refrigerant inlet / outlet, and the side surface portion in the vicinity of the counter valve seat side end surface of the counter valve seat side porous body are in communication with the filter. A communication passage. When the valve is opened, one refrigerant inlet / outlet communicates with the other refrigerant inlet / outlet via a valve hole. Data, the communication passage, the two porous bodies, through the throttle passage, the opening and the valve hole, characterized by comprising configured to communicate with the other of the refrigerant inlet and outlet of one of the refrigerant inlet and outlet as the inlet side.

  The second invention is characterized in that the filter is formed of a porous material having a pore diameter smaller than that of the porous body.

  According to a third aspect of the present invention, the communication path is formed from a plurality of holes formed in the radial direction of the valve stem, and further, the refrigerant flow resistance in the vicinity of the communication path is made larger than the refrigerant flow resistance of the other part of the filter. The refrigerant flow restricting means is provided on the filter outer peripheral side in the vicinity of the communication path.

  According to a fourth aspect of the present invention, the refrigerant flow restricting means includes a baffle plate disposed on the outer periphery of the filter in the vicinity of the communication path.

  According to a fifth aspect of the present invention, the communication passage is formed along a plurality of holes formed in the radial direction of the valve stem and the counter valve seat side end surface of the porous body on the counter valve seat side. It is characterized by comprising a space part.

  According to a sixth aspect of the present invention, the communication path includes a plurality of holes formed in the radial direction of the valve stem, and a space portion that communicates with the hole and is formed along the valve stem side surface of the filter. It is characterized by.

  According to a seventh aspect of the invention, the communication passage is formed along a plurality of holes formed in the radial direction of the valve stem and the end face of the counter valve seat side of the porous body on the counter valve seat side. And a space formed in communication with the hole and along the valve rod side surface of the filter.

  According to an eighth aspect of the invention, the communication path includes a plurality of holes formed in the radial direction of the valve stem, and a space portion that is communicated with the hole and formed along the valve stem side surface of the filter. This space portion is formed in a taper shape so that the clearance dimension of the space portion becomes smaller as the distance from the hole increases along the valve stem side surface.

  According to a ninth aspect of the present invention, the communication passage is formed by a plurality of holes formed in the radial direction of the valve stem, and a space portion formed along the outer peripheral surface of the porous body on the counter valve seat side. It is formed from these.

  A tenth aspect of the invention is characterized in that the refrigerant control valve is used as an expansion device for an air conditioner.

  According to the first invention, the filter extends along the outer peripheral surface of the valve stem in the valve seat side direction from the position near the counter valve seat side end surface of the porous body on the counter valve seat side, and the communication path is provided. The side surface portion of the porous body on the counter valve seat side in the vicinity of the end surface on the counter valve seat side is formed to communicate with the filter, and the thickness of the porous body on the counter valve seat side of the throttle passage in the valve axis direction of the filter Can be close to the height dimension. Therefore, the thickness dimension of the counter valve seat side porous body can be increased. As a result, when the refrigerant control valve is closed, the rectification effect of the refrigerant by the counter-valve seat side porous body on the inlet side of the throttle passage, that is, the bubble fragmentation effect is improved, and the refrigerant when the refrigerant control valve is closed Passing sound can be reduced.

  According to the second invention, since the filter is formed by the porous material having a pore diameter smaller than that of the communication passage and the porous body, in addition to the effect of the first invention, as a further effect, when the valve is closed, the filter is upstream. On the side, contaminants can be removed almost completely with a filter. Therefore, clogging of contaminants in the porous body can be prevented, and the homogenizing action of the refrigerant can be stabilized for a long time.

  According to the third invention, the effects of the first and second inventions can be obtained, and the following effects can be further obtained. That is, since the communication path is formed of a plurality of holes formed in the radial direction of the valve rod, the refrigerant passage area of the communication path can be increased, and refrigerant drift near the communication path in the filter is reduced. In addition, since the refrigerant flow restricting means is provided on the outer peripheral side of the filter in the vicinity of the communication path, the refrigerant drift that the refrigerant flow concentrates in the vicinity of the communication path in the filter can be prevented, and the refrigerant flow in the filter can be homogenized. . Further, the homogenization of the refrigerant flow can prevent sudden clogging in the vicinity of the communication path on the filter surface, and can prolong the life of the filter. Further, by homogenizing the refrigerant flow, it is possible to prevent the pulsation of the refrigerant flowing into the communication path, and it is possible to further reduce the refrigerant passing sound.

  According to the fourth invention, in addition to the effects of the third invention, the refrigerant flow regulating means can be formed of a baffle plate having a simple structure.

  According to the fifth aspect, in addition to the effects of the first and second aspects, the following effect can be further achieved. That is, since the space is formed in contact with the end face on the counter valve seat side of the porous body, the inflow area to the porous body when the valve is closed can be increased. Therefore, since the refrigerant flow in the porous body on the inlet side of the throttle passage is made uniform, the rectifying effect of the porous body, that is, the effect of refining the bubbles is further promoted, and the refrigerant passing sound can be further reduced.

  According to the sixth invention, in addition to the effects of the first and second inventions, the following effects can be further achieved. Since the space is formed on the downstream side of the filter, it is possible to prevent the drift of the refrigerant in the filter. Therefore, partial sudden clogging on the filter surface can be prevented, and the life of the filter can be extended. Further, by preventing this drift, the pulsation of the refrigerant in the filter can be prevented, and the refrigerant passing sound can be further reduced.

  According to the seventh aspect, in addition to the effects of the first and second aspects, the effects of the fifth aspect and the sixth aspect can be achieved.

  According to the eighth invention, in addition to the effects of the first and second inventions, the following effects can be further achieved. That is, since the space is formed on the downstream side of the filter, the refrigerant is prevented from drifting in the filter, and the filter is prevented from being rapidly clogged. In addition, this can prolong the life of the filter. Further, by preventing this drift, the refrigerant pulsation can be prevented in the filter, and the refrigerant passing sound can be further reduced. Further, in the space portion after passing through the filter, the gap of the space portion is reduced toward the inlet from the radial hole constituting the communication path, so that the re-aggregation of bubbles in the space portion is alleviated, and the refrigerant passing sound is reduced. The reduction effect can be further improved.

  According to the ninth aspect, in addition to the effects of the first and second aspects, the following effect can be further achieved. Since the space portion is formed in contact with the outer peripheral surface of the counter valve seat side porous body, the inflow area to the porous body at the time of valve closing can be increased. Therefore, since the refrigerant flow in the porous body on the inlet side of the throttle passage is made uniform, the rectifying effect of the porous body, that is, the effect of refining the bubbles is further promoted, and the refrigerant passing sound can be further reduced.

  According to the tenth aspect, by using the refrigerant control valve of the present invention for the expansion device of the air conditioner, it is possible to obtain an air conditioner capable of dehumidifying operation with reduced refrigerant passage noise.

  Each embodiment will be described below with reference to the drawings.

  First, Example 1 is demonstrated based on FIG.1 and FIG.2. FIG. 1 is a cross-sectional view of the refrigerant control valve according to the first embodiment of the present invention, showing a closed state. FIG. 2 is a refrigerant circuit diagram of an air conditioner using the refrigerant control valve. In FIG. 1, the solid line arrow shows the flow direction of the refrigerant in the valve closed state. Further, in FIG. 2, the solid arrow indicates the refrigerant flow direction during the cooling operation and the dehumidification operation, and the broken arrow indicates the refrigerant distribution direction during the dehumidification operation.

  This refrigerant control valve 1 is a valve that is driven to open and close by an electromagnetic coil, and refrigerant inlets 2 and 3 are arranged on two orthogonal faces of the valve box 1a. The refrigerant inlet / outlet 2 is a refrigerant inlet during the dehumidifying operation and the cooling operation, and the refrigerant inlet / outlet 3 is a refrigerant inlet during the heating operation. A valve seat 4 is formed between the two refrigerant inlets 2 and 3. A valve hole 5 is formed in the central portion of the valve seat 4. A cylindrical valve rod 6 reciprocates with respect to the valve seat 4, and the valve hole 5 is opened and closed by the tip of the valve rod 6 being separated from and contacting the valve seat 4. A throttle passage 7 is formed in the valve rod 6, and porous bodies 8 and 9 in which a porous substance is formed in a disk shape are arranged before and after the throttle passage 7. A support plate 10 that supports the porous body 9 is provided at the tip of the valve stem 6, and the support plate 10 is provided with a plurality of openings 10 a for communicating the throttle passage 7 with the valve hole 5. Yes.

  The counter-valve seat-side porous body 8 refines the bubbles contained in the refrigerant flowing into the throttle passage 7 during the dehumidifying operation, and rectifies (homogenizes) the flow of the refrigerant containing the bubbles. Further, the porous body 9 on the valve seat side absorbs the energy of the refrigerant jet after being decompressed by the throttle passage 7.

  Moreover, as the porous bodies 8 and 9, what has many holes and allows a refrigerant to pass through can be used. Specific examples thereof include foamed metal, foamed resin, sintered metal, ceramics, and superposed metal mesh. In addition, it is preferable that the hole diameter of the porous body is smaller than the hole diameter of the throttle passage 7 so as to prevent the throttle passage 7 from being clogged with contaminants.

  Further, a recess is provided on the outer peripheral side of the valve stem 6, and a cylindrical filter 11 is disposed in this recess. In this way, the outer periphery of the filter 11 is formed to be substantially the same as the outer periphery of the valve stem 6. One end of the filter 11 is on the counter valve seat side end face 8a of the porous body 8 on the counter valve seat side, and the other end is formed so as to extend from the vicinity of the counter valve seat side end face 8a toward the valve seat side. A plurality of communication passages 12 communicating with the porous body 8 and the counter valve seat side of the filter 11 are arranged in the vicinity of the counter valve seat side end face 8a of the porous body 8 at a predetermined angular pitch in the radial direction. The hole diameter of the communication path 12 is preferably about 0.5 to 1.0 mm.

By forming in this way, the length of the filter 11 in the valve axis direction is not much different from the conventional one, but the thickness of the porous body 8 and the thickness of the porous body 9 can be configured longer than before. Further, a refrigerant passage 13 communicating with the refrigerant inlet / outlet 2 is formed between the filter 11 and the inner wall of the valve box 1a. The filter 11 prevents clogging on the downstream side. Therefore, the filter is formed of a porous material having a pore diameter smaller than that of the throttle passage 7 and the porous bodies 8 and 9. Since the filter 11 also has an effect of rectifying the refrigerant, the finer the filter, the more effective the refrigerant clear flow effect can be. However, in order to prevent clogging due to dust floating in the refrigerant from becoming extremely easy to occur. 50 μm or more is desirable.

  Further, as the filter 11, a filter having a small bias in the gap between the structural members is used. As a thing with little bias | inclination of a clearance gap, what overlapped the metal mesh, the foam metal, the thing which wound the metal wire etc. in the threadball shape etc. can be mentioned. If a material with a large gap is used, such as a nonwoven fabric, the gap in the gap is uneven (dense / dense), so that the residue in the refrigerant flows through the sparse part and is clogged by the downstream porous body 8 or the throttle passage 7. May occur.

  In the refrigerant control valve 1, since the communication path 12 that connects the filter 11 and the porous body 8 is formed in the valve rod 6 as described above, a large hole cannot be formed as the communication path 12. For this reason, the communication path 12 is formed from a plurality of holes formed in the radial direction of the valve stem 6. For example, when the diameter of the valve stem 6 is 9 mm, the diameter of the hole is preferably about 0.5 to 1 mm, and about 6 to 8 holes are formed in the radial direction of the valve stem 6.

  In the refrigerant control valve 1 configured in this way, one of the refrigerant inlet / outlet ports 2 is connected to the valve hole 5 via the valve hole 5 when the valve rod 6 is opened when the tip of the valve rod 6 is separated from the valve seat 4, that is, during cooling operation and heating operation. It communicates directly with the other refrigerant inlet / outlet 3. Therefore, the refrigerant flowing in from the refrigerant inlet / outlet 2 (or the refrigerant inlet / outlet 3) flows through the valve hole 5 to the other refrigerant inlet / outlet 3 (or refrigerant inlet / outlet 2).

  In the refrigerant control valve 1, the valve hole 5 is closed at the tip of the valve stem 6 when the valve stem 6 is in close contact with the valve seat 4, that is, during the dehumidifying operation. For this reason, the valve hole 5 communicates with the refrigerant inlet / outlet 2 via the opening 10 a, the porous body 9, the throttle passage 7, the porous body 8, the communication passage 12, the filter 11, and the refrigerant passage 13. Therefore, the refrigerant flowing in from the refrigerant inlet / outlet 2 passes through the refrigerant passage 13, the contaminants are removed by the filter 11, and rectified by the porous body 8 through the communication passage 12. The rectified refrigerant expands in the throttle passage 7 and jets out to the other porous body 9. The refrigerant jetted into the porous body 9 has its jet energy absorbed by the porous body 9 and flows to the other refrigerant inlet / outlet 3 through the opening 10a.

  The refrigerant control valve 1 configured as described above is used as shown in the refrigerant circuit of FIG. As shown in this refrigerant circuit, a four-way valve 22 is connected to the inlet / outlet of the compressor 21, and an outdoor heat exchanger 23 and an electric expansion valve 24 are separated between the switching ports of the four-way valve 22. Heat exchangers 25a and 25b are connected. And the refrigerant | coolant control valve 1 is arrange | positioned between the indoor side heat exchanger 25a and the indoor side heat exchanger 25b. The compressor 21, the four-way valve 22, the outdoor heat exchanger 23, and the electric expansion valve 24 in the refrigerant circuit are built in the outdoor unit, and the indoor heat exchanger 25a, the indoor heat exchanger 25b, and the refrigerant control valve. 1 is built in the indoor unit. Moreover, in FIG. 2, the code | symbol 27 is an outdoor unit side closing valve, and 28 is an indoor unit side closing valve. Reference numeral 29 is a connecting pipe that connects the outdoor unit and the indoor unit.

  When performing the cooling operation, the air conditioner having the above configuration switches the four-way valve 22 and opens the refrigerant control valve 1 so that the refrigerant flows as indicated by the solid line arrow. As a result, a refrigerant flow path that does not form a large refrigerant flow resistance is formed between the refrigerant inlets / outlets 2 and 3 in the refrigerant control valve 1. By operating the refrigerant circuit in this way, the outdoor heat exchanger 23 acts as a condenser, the indoor heat exchangers 25a and 25b act as evaporators, and the indoor heat exchangers 25a and 25b Air cools and dehumidifies.

  Next, when the dehumidifying operation is performed, the four-way valve 22 is switched so that the refrigerant flows as indicated by the solid line as in the cooling operation, and the refrigerant control valve 1 is closed, that is, the throttle state. . In this throttled state, the refrigerant inlet / outlet 2 serving as a refrigerant inlet is a refrigerant outlet through a refrigerant passage 13, a filter 11, a communication passage 12, a porous body 8, a throttle passage 7, a porous body 9, an opening 10 a, and a valve hole 5. Is communicated with the refrigerant inlet / outlet 3. As a result, an expansion mechanism is formed in the refrigerant control valve 1. Therefore, by operating the refrigerant circuit in this way, the outdoor heat exchanger 23 and the indoor heat exchanger 25a function as a condenser, and the indoor heat exchanger 25b functions as an evaporator. As a result, the indoor air is heated by the indoor heat exchanger 25a and cooled and dehumidified by the indoor heat exchanger 25b. That is, dehumidification can be performed without changing the room temperature so much.

  Further, when performing the heating operation, the four-way valve 22 is switched so that the refrigerant flows as indicated by the broken arrow, and the refrigerant control valve 1 is fully opened. When fully opened, a refrigerant flow path having no large refrigerant flow resistance is formed between the refrigerant inlet / outlet ports 2 and 3 in the refrigerant control valve 1 as in the above-described cooling operation. By operating the refrigerant control valve 1 and the refrigerant circuit as described above, the outdoor heat exchanger 23 acts as an evaporator, and the indoor heat exchangers 25a and 25b act as condensers. As a result, the room is heated.

  In this air conditioner, the refrigerant is not limited to the HCFC refrigerant, and various refrigerants such as an HFC refrigerant can be used. In addition to mineral oil, ether-based and ester-based oils can be used as the refrigeration oil. .

  Since the first embodiment is configured as described above, the following effects can be obtained.

  In general, when a gas-liquid two-phase flow refrigerant flows into the throttling mechanism, the liquid refrigerant and the gas refrigerant alternately flow, so that a refrigerant passing sound is generated by the pulsation. However, in the refrigerant control valve 1 of the first embodiment, the gas-liquid two-phase flow refrigerant that has flowed into the refrigerant control valve 1 is rectified so that bubbles are subdivided by the porous body 8 before flowing into the throttle passage 7. Therefore, the pressure fluctuation in the throttle passage 7 is prevented, and the refrigerant passing sound generated by the refrigerant control valve 1, particularly the discontinuous noise, is reduced. Further, since the jet energy of the refrigerant ejected from the throttle passage 7 is consumed by the porous body 9, the refrigerant passing sound, particularly the continuous sound, caused by this jet flow is reduced.

  In the refrigerant control valve 1 of the first embodiment, the filter 11 extends along the outer peripheral surface of the valve stem 6 from the position near the counter valve seat side end surface 8a of the counter valve seat side porous body 8 in the valve seat side direction. The communication passage 12 is formed so as to communicate the side surface portion in the vicinity of the anti-valve seat side end surface 8a of the porous body 8 on the anti-valve seat side with the filter 11, so that the anti-valve seat side of the throttle passage 7 is provided. The thickness of the porous body 8 can be made close to the height dimension of the filter 11 in the valve axis direction, and the thickness dimension of the counter valve seat side porous body 8 can be increased. Therefore, when the refrigerant control valve 1 is closed, the refrigerant rectifying effect, that is, the bubble subdividing effect by the counter valve seat side porous body 8 on the inlet side of the throttle passage 7 is improved, and the refrigerant control valve 1 is closed. The refrigerant passing sound at the time can be further reduced.

  In the refrigerant control valve 1, the filter 11 is formed of a porous material having a pore diameter smaller than the pore diameter of the porous body 8. Therefore, when the valve is closed, contaminants are substantially removed by the filter 11 on the upstream side of the porous body 8. It can be completely removed. Therefore, clogging of contaminants in the porous body 8 can be prevented, and the homogenizing action of the refrigerant can be stabilized for a long period of time.

  Further, in this refrigerant control valve 1, the communication passage 12 is formed from a plurality of holes formed in the radial direction of the valve rod 6, so that the refrigerant passage area of the communication passage 12 can be increased, and the filter 11 The refrigerant drift in the vicinity of the communication path 12 can be further reduced.

  In addition, since the refrigerant control valve 1 of the first embodiment includes the filter 11 in front of the throttle passage 7, in the air conditioner using the refrigerant control valve 1, a filter is provided to the inlet pipe of the refrigerant control valve 1. There is no need to provide it, and the number of parts can be reduced, and the cost can be reduced.

  Next, Example 2 will be described with reference to FIG. FIG. 3 is a sectional view showing a closed state of the refrigerant control valve according to the second embodiment of the present invention. In FIG. 3, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the refrigerant control valve of the first embodiment, since the hole diameter of the communication path 12 is small, the refrigerant passing through the filter 11 concentrates on the portion that contacts the communication path 12. For this reason, the pulse action of the refrigerant flowing in the gas-liquid two layers tends to be reflected as it is in the refrigerant passing through the communication path 12. Therefore, in the second embodiment, it is considered that such a pulse operation is prevented by the filter 11. For this reason, in the second embodiment, the cylindrical baffle plate 31 made of a material that does not pass or hardly passes through the side portion of the communication passage 12 in the outer surface portion of the filter 11 and the vicinity thereof is used as the refrigerant flow restricting means. Provided.

  The baffle plate 31 that constitutes the refrigerant flow regulating means may be, for example, a metal ring, a sheet, a seal or the like that does not allow the refrigerant to pass therethrough, or a refrigerant such as a high-pressure loss porous member. The member which cannot pass easily may be sufficient.

  Further, such a baffle plate 31 does not have to be confined to a cylindrical shape, and may be any one that covers the side portion of the communication path 12 and is partially formed in the circumferential direction. Also good.

  Further, although the baffle plate 31 is in close contact with the outer peripheral surface of the filter 11 in FIG. 3, it may be attached to the valve box 1 a side with a small gap between the baffle plate 31 and the filter 11.

  According to the refrigerant control valve 1 of the second embodiment, the refrigerant flow restricting means is provided on the outer peripheral side of the filter 11 in the vicinity of the communication passage 12, so that the refrigerant flow concentrates in the vicinity of the communication passage 12 in the filter 11. Is prevented, and the refrigerant flow in the filter 11 can be homogenized. Further, the homogenization of the refrigerant flow can prevent a sudden clogging in the vicinity of the communication path 12 on the surface of the filter 11, thereby extending the life of the filter 11. Further, the homogenization of the refrigerant flow can alleviate the pulsation of the refrigerant flowing into the communication passage 12, and the refrigerant passing sound can be further reduced. Moreover, since it is comprised with the baffle plate 31 as a refrigerant | coolant distribution control means, it can be set as a simple structure.

  Next, Example 3 will be described with reference to FIG. FIG. 4 is a cross-sectional view showing a closed state of the refrigerant control valve according to the second embodiment of the present invention. In FIG. 4, the same or corresponding portions as those in the second embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the refrigerant control valve 1 according to the third embodiment, the communication passage 12 in the second embodiment is formed in a communication passage 40 as shown in FIG. That is, the communication path 40 is formed along a plurality of holes 41 formed in the radial direction of the valve stem 6 and the counter valve seat side end surface 8a of the porous body 8 on the counter valve seat side. The space portion 42 is formed. In addition, in order to form the space part 42, the outer peripheral edge part in the counter valve seat side edge part of the porous body 8 is notched on the step.

  According to the refrigerant control valve 1 of the third embodiment, since the space portion 42 is formed along the counter valve seat side end surface 8a of the counter valve seat side porous body 8 when the dehumidifying operation is closed, The inflow area into the porous body 8 can be increased. Accordingly, since the refrigerant flow in the porous body 8 arranged on the inlet side of the throttle passage 7 is made uniform, the rectifying effect of the porous body 8, that is, the effect of refining bubbles is further promoted, and the refrigerant passing sound is further increased. It can be further reduced.

  Next, Example 4 will be described with reference to FIG. FIG. 5 is a sectional view showing a closed state of the refrigerant control valve according to the third embodiment of the present invention. In FIG. 5, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the refrigerant control valve 1 according to the fourth embodiment, the communication path 12 in the first embodiment is a communication path 50 as shown in FIG. That is, the communication path 50 includes a plurality of holes 51 formed in the radial direction of the valve stem 6 and a space portion 52 that communicates with the holes 51 and is formed along the side surface of the valve stem 6 of the filter 11. It is configured.

  For example, when the diameter of the valve stem 6 is 9 mm, the width of the space 52 is preferably about 0.5 to 1.5 mm.

  According to the refrigerant control valve 1 of the fourth embodiment, since the space 52 is formed on the downstream side of the filter 11 when the dehumidifying operation is closed, the refrigerant drift in the filter 11 can be prevented. it can. Thereby, partial sudden clogging on the surface of the filter 11 can be prevented, and the life of the filter 11 can be extended. Further, by preventing this drift, the pulsation of the refrigerant in the filter 11 can be relaxed, and the refrigerant passing sound can be further reduced.

  Next, Example 5 will be described with reference to FIG. FIG. 6 is a cross-sectional view showing a closed state of the refrigerant control valve according to the fifth embodiment of the present invention. In FIG. 5, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the refrigerant control valve 1 according to the fifth embodiment, the communication path 12 in the first embodiment is a communication path 60 as shown in FIG. That is, the communication path 60 is configured by a plurality of holes 61 formed in the radial direction of the valve stem 6 and a space portion 52 that communicates with the holes 61 and is formed along the valve stem side surface of the filter 11. Has been. The hole 61 connects the corner of the counter valve seat side end face 8 a of the porous body 8 and the vicinity of the counter valve seat side end of the filter 11. The space 62 is formed in a taper shape so that the clearance dimension (dimension in the radial direction) of the space decreases as the distance from the hole 61 along the surface on the valve stem side of the filter 11 decreases.

  According to the refrigerant control valve 1 of the fifth embodiment, since the space 62 is formed on the downstream side of the filter 11 when the dehumidifying operation is closed, the refrigerant drift in the filter 11 is prevented, and the filter 11 sudden clogging is prevented. In addition, this makes it possible to extend the life of the filter 11. In addition, by preventing this drift, the pulsation of the refrigerant in the filter 11 can be reduced and the refrigerant passing sound can be further reduced. Furthermore, the space 62 after passing through the filter 11 is formed in a taper shape so that the clearance (radial dimension) of the space decreases as the distance from the hole 61 along the valve rod side surface of the filter 11 decreases. Therefore, the reassembly of bubbles in the space 62 is reduced, and the refrigerant passing sound reduction effect can be further improved.

  Next, Example 6 will be described with reference to FIG. FIG. 7 is a cross-sectional view showing a closed state of the refrigerant control valve according to the sixth embodiment of the present invention. In FIG. 7, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the refrigerant control valve 1 according to the sixth embodiment, the communication path 12 in the first embodiment is a communication path 70 as shown in FIG. That is, the communication passage 70 is formed along a plurality of holes 71 formed in the radial direction of the valve rod 6 and the end face 8a of the porous body 8 on the counter valve seat side, which is in communication with the holes 71. And a space portion 73 that communicates with the hole 71 and that is formed along the valve rod side surface of the filter 11. The hole 71 connects the corner of the counter valve seat side end face 8 a of the porous body 8 and the vicinity of the counter valve seat side end of the filter 11. The space portion 73 is formed in a tapered shape so that the clearance dimension (dimension in the radial direction) of the space portion becomes smaller as the distance from the hole 71 along the valve rod side surface of the filter 11 decreases.

  According to the refrigerant control valve 1 of the sixth embodiment, since the space 72 is formed in contact with the counter valve seat side end surface 8a of the porous body 8 when the dehumidifying operation is closed, the porous body when the valve is closed. The inflow area to 8 can be increased. Therefore, since the refrigerant flow in the porous body 8 on the inlet side of the throttle passage 7 is made uniform, the rectifying effect of the porous body 8, that is, the effect of refining bubbles is further promoted, and the refrigerant passing sound is further reduced. be able to. Further, since the space 73 is formed on the downstream side of the filter 11, it is possible to prevent the refrigerant from drifting in the filter 11, preventing partial sudden clogging on the surface of the filter 11. The lifetime can be extended. Further, by preventing this drift, it is possible to prevent the pulsation of the refrigerant in the filter 11 and to further reduce the refrigerant passing sound. Further, the space 83 after passing through the filter 11 is formed in a tapered shape so that the clearance dimension (the dimension in the radial direction) of the space 73 becomes smaller as the distance from the hole 71 along the valve rod side surface of the filter 11 decreases. Therefore, the re-aggregation of bubbles in the space 73 is reduced, and the refrigerant passing sound reduction effect can be further improved.

  Next, Example 7 will be described with reference to FIG. FIG. 8 is a sectional view showing a closed state of the refrigerant control valve according to the seventh embodiment of the present invention. In FIG. 8, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the refrigerant control valve 1 according to the seventh embodiment, the communication path 12 in the first embodiment is a communication path 80 as shown in FIG. That is, the communication passage 80 includes a plurality of holes 81 formed in the radial direction of the valve stem 6 and a space portion that is communicated with the holes 81 and formed along the outer peripheral surface of the porous body 8 on the counter valve seat side. 82 and a space 83 formed in communication with the hole 81 and along the valve rod side surface of the filter 11.

  According to the refrigerant control valve 1 of the seventh embodiment, since the space 82 is formed along the outer peripheral surface of the porous body 8 on the counter valve seat side when the valve is dehumidified, the refrigerant is porous. The area flowing into 8 increases. Therefore, the refrigerant flow in the porous body 8 is made uniform, and the refrigerant rectifying effect is increased. Further, since the space 83 is formed on the downstream side of the filter 11, it is possible to prevent the refrigerant from drifting in the filter 11, to prevent the refrigerant from pulsating in the filter 11, and to further reduce the refrigerant passing sound. Can be reduced. Further, by preventing this drift, partial sudden clogging on the surface of the filter 11 can be prevented, and the life of the filter 11 can be extended.

  Next, Example 8 will be described with reference to FIGS. FIG. 9 is a cross-sectional view showing a closed state of the refrigerant control valve according to the eighth embodiment of the present invention. FIG. 10 is a side view of a valve stem according to the refrigerant control valve. FIG. 11 is a side view of a modified example of the valve stem according to the refrigerant control valve. In these drawings, the same or corresponding portions as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  In the refrigerant control valve 1 according to the eighth embodiment, the communication passage 12 in the first embodiment is a communication passage 90 as shown in FIGS. 9 and 10. That is, the communication passage 90 is formed of a plurality of holes formed in the radial direction of the valve stem 6, but is formed in a hole having a circular cross section larger than that in the first embodiment. In the present invention, since the thickness of the porous body 8 is increased and the overlap in the valve axis direction with the filter 11 is increased, such a measure can be taken.

  According to the eighth embodiment configured as described above, since the hole diameter of the communication passage 90 is increased, the refrigerant flow in the filter 11 can be homogenized. Further, the homogenization of the refrigerant flow can prevent a sudden clogging in the vicinity of the communication path on the surface of the filter 11, thereby extending the life of the filter 11. Moreover, the homogenization of the refrigerant flow can prevent the pulsation of the refrigerant flowing into the communication passage 90, and the refrigerant passing sound can be further reduced.

  The communication path 90 may be a communication path 90a having a substantially quadrangular cross section as shown in FIG. 11, and in this case, the same effect as described above can be obtained.

  The refrigerant control valve of the present invention can be applied as an expansion device for an air conditioner that requires stable and quiet dehumidifying operation performance.

It is sectional drawing which shows the valve closing state of the refrigerant | coolant control valve which concerns on Example 1 of this invention. It is a refrigerant circuit diagram of an air conditioner using the refrigerant control valve of the present invention. It is sectional drawing which shows the valve closing state of the refrigerant | coolant control valve which concerns on Example 2 of this invention. It is sectional drawing which shows the valve closing state of the refrigerant | coolant control valve which concerns on Example 3 of this invention. It is sectional drawing which shows the valve closing state of the refrigerant | coolant control valve which concerns on Example 4 of this invention. It is sectional drawing which shows the valve closing state of the refrigerant | coolant control valve which concerns on Example 5 of this invention. It is sectional drawing which shows the valve closing state of the refrigerant | coolant control valve which concerns on Example 6 of this invention. It is sectional drawing which shows the valve closing state of the refrigerant | coolant control valve which concerns on Example 7 of this invention. It is sectional drawing which shows the valve closing state of the refrigerant | coolant control valve which concerns on Example 8 of this invention. It is a side view of the valve stem which concerns on the same refrigerant control valve. It is a side view of the modification of the valve rod which concerns on the same refrigerant control valve. It is sectional drawing which shows the valve closing state of the refrigerant | coolant control valve which concerns on a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigerant control valve 1a Valve box 2 Refrigerant inlet / outlet 3 Refrigerant inlet / outlet 4 Valve seat 5 Valve hole 6 Valve rod 7 Restriction passage 7 Communication passage 8 (Counter valve seat side) Porous body 8a Counter valve seat side end surface 9 (Valve seat side) ) Porous body 10 Support plate 10a Opening 11 Filter 12 Communication passage 13 Refrigerant passage 31 Baffle plate 40 Communication passage 41 Hole 42 Space portion 50 Communication passage 51 Hole 52 Space portion 60 Communication passage 61 Hole 62 Space portion 70 Communication passage 71 Hole 72 Space Part 73 Space part 80 Communication path 81 Hole 82 Space part 83 Space part 90 Communication path

Claims (10)

Two refrigerant inlets and outlets, a valve seat formed between the two refrigerant inlets and outlets, a valve hole formed in the valve seat, reciprocates with respect to the valve seat, and the tip is separated from the valve seat so that the valve A valve stem that opens and closes the hole, a throttle passage formed in the valve stem, two porous bodies made of a porous material arranged before and after the throttle passage, and a throttle passage formed at the tip of the valve stem An opening communicating with the tip of the valve stem, and a filter extending in the valve seat direction from a position near the counter valve seat side end surface of the porous body on the counter valve seat side along the outer peripheral surface of the valve stem, A refrigerant passage formed along the outer peripheral surface of the filter in communication with the refrigerant inlet / outlet, and a communication passage communicating with the filter in the vicinity of the side surface portion of the counter valve seat side end surface of the counter valve seat side porous body, When the valve is opened, one refrigerant inlet / outlet communicates with the other refrigerant inlet / outlet via the valve hole, and when the valve is closed, the refrigerant passage, filter, communication passage, One of the porous body, throttle passage, through the aperture and the valve hole, a refrigerant control valve, characterized by comprising configured to communicate with the other of the refrigerant inlet and outlet of one of the refrigerant inlet and outlet as the inlet side. The refrigerant control valve according to claim 1, wherein the filter is formed of a porous material having a pore diameter smaller than that of the communication path and the porous body. The communication path is formed of a plurality of holes formed in the radial direction of the valve stem, and further, refrigerant flow restriction means for increasing the refrigerant flow resistance in the vicinity of the communication path as compared with the refrigerant flow resistance of the other part of the filter. The refrigerant control valve according to claim 1, wherein the refrigerant control valve is provided on an outer peripheral side of the filter near the passage. 4. The refrigerant control valve according to claim 3, wherein the refrigerant flow restricting means comprises a baffle plate disposed on the outer periphery of the filter in the vicinity of the communication path. The communication path includes a plurality of holes formed in the radial direction of the valve stem, and a space portion that is communicated with the holes and formed along the counter valve seat side end surface of the counter valve seat side porous body. The refrigerant control valve according to claim 1 or 2, characterized by the above-mentioned. The communication path is composed of a plurality of holes formed in a radial direction of the valve stem, and a space portion communicating with the holes and formed along a valve stem side surface of the filter. The refrigerant control valve according to 1 or 2. The communication path includes a plurality of holes formed in a radial direction of the valve stem, a space portion that is communicated with the holes and is formed along a counter valve seat side end surface of the counter valve seat side porous body, The refrigerant control valve according to claim 1 or 2, comprising a space portion communicating with the hole and formed along the valve rod side surface of the filter. The communication passage includes a plurality of holes formed in a radial direction of the valve stem, a space portion that is communicated with the holes and is formed along the counter valve seat side end surface of the counter valve seat side porous body, And a space formed along the valve stem side surface of the filter, and the space formed along the valve stem side surface of the filter extends from the hole in the axial direction of the valve stem. The refrigerant control valve according to claim 1 or 2, wherein the refrigerant control valve is formed in a taper shape so that a gap dimension of the space portion becomes smaller as the distance increases. The communication path is formed by a plurality of holes formed in the radial direction of the valve stem, and a space portion that communicates with the holes and is formed along the outer peripheral surface of the counter valve seat side porous body. The refrigerant control valve according to claim 1 or 2. An air conditioner using the refrigerant control valve according to any one of claims 1 to 9 as an expansion device.

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