JP2013104439A - Dehumidification valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve quietness by reducing pulsation of a refrigerant with a simple structure, in a dehumidification valve of an air conditioner.SOLUTION: A plurality of throttle grooves 21 are formed in a valve seat portion 2b. During a dehumidification operation, a valve element 3 is driven by the energization of an electromagnetic coil device 6, the valve seat portion 2b of a valve seat member 2 with flange is valve-closed with a valve portion 3a. Throttling effect is obtained by expanding the refrigerant with the throttle grooves 21. A pulsation absorbing member 4 is arranged around a valve shaft 3b of the valve element 3. By the pulsation absorbing member 4, the pulsation energy of the refrigerant flowing in from a primary side joint 10 is absorbed within a valve chamber 1A. The pulsation absorbing member 4 is constituted by a sintered filter, a demister filter, a foamed member, a stacked flat plates, a stacked curved plates, a two-layer coil spring, a two-layer punching metal, etc. Or the valve shaft of the valve element is made of a porous pulsation absorbing member.

Description

  The present invention relates to a dehumidification valve that is provided between a first heat exchanger and a second heat exchanger that constitute an indoor heat exchanger of an air conditioner and throttles a refrigerant during a dehumidifying operation.

  Conventionally, in an air conditioner having a dehumidifying operation function, an indoor heat exchanger is composed of a first heat exchanger and a second heat exchanger, and a dehumidifying valve is provided between the two heat exchangers. Then, during normal operation, the dehumidification valve is fully opened so that both heat exchangers function as a unit, and during dehumidification operation, the dehumidification valve functions as an expansion device, and the first heat exchanger on the upstream side (high pressure side) is a condenser. The second heat exchanger on the downstream side (low pressure side) functions as an evaporator.

  As this type of dehumidifying valve, for example, Japanese Patent No. 4064762 (Patent Literature 1), Japanese Patent No. 4197470 (Patent Literature 2), Japanese Patent No. 3955361 (Patent Literature 3) and Japanese Patent Application Laid-Open No. 2004-150580 (Patent Literature). There is one disclosed in Reference 4). Patent Documents 1 and 2 are filter systems that squeeze the refrigerant using a filter and an orifice, and Patent Documents 3 and 4 have a groove formed between a valve element and a valve seat (valve seat equivalent). It is a groove system that squeezes the refrigerant.

Japanese Patent No. 4064762 Japanese Patent No. 4197470 Japanese Patent No. 3955361 JP 2004-150580 A

  As described above, the conventional dehumidifying valve includes a filter method and a groove method. In the case of the filter system, since the refrigerant permeates the filter, the bubbles in the refrigerant become finer, and the burst sound of the bubbles at the time of expansion after passing through the filter is reduced, resulting in excellent silence. However, in this filter system, since the refrigerant always passes through the filter, contamination (foreign matter in the refrigerant) is clogged in the small holes of the filter. Further, since the area through which the fluid can pass through the filter is actually only in the vicinity of the orifice, the area through which the fluid can pass through the filter is small, and the filter itself may be clogged. Further, in the filter method, since the amount of transmission of the filter must be taken into account, the filter itself is expensive.

  On the other hand, in the case of the groove system, when the valve is fully opened, the groove of the valve body or the valve seat is constantly exposed to the flowing refrigerant, so that the groove serving as the throttle portion does not become clogged. In addition, the setting of the groove width, groove shape, and the like is easy and the cost is low.

  By the way, the refrigerant flowing into the valve chamber from the primary side joint on the high pressure side is a liquid-gas mixed refrigerant, and further, discharge of refrigerant from the compressor, throttling of an expansion valve provided upstream of the dehumidification valve, and air conditioning A pulsation of the refrigerant is generated from the primary side joint to the valve chamber due to bending of the piping in the machine. For this reason, although the groove method is excellent in terms of durability and low cost, the pulsation of the refrigerant increases the sound of passage through the groove (the sound when the refrigerant passes through the groove), and there is room for improvement in terms of quietness. is there.

  It is an object of the present invention to reduce noise passing through a groove due to refrigerant pulsation and improve silence while ensuring durability and low cost by a groove system in a dehumidifying valve.

  The dehumidification valve according to claim 1 includes a valve housing forming a valve chamber, the primary side joint communicating with the valve chamber of the valve housing, and the secondary side joint communicating with an axial end of the valve chamber. A valve seat provided on the valve chamber side of the secondary side joint, a valve portion movably provided in the axial direction in the valve chamber and seated / separated with respect to the valve seat, and connected to the valve portion An electromagnetic drive unit that moves the valve unit by driving the plunger in the axial direction, and when the valve unit is in a seated state, the refrigerant flowing from the primary side joint is transferred between the valve unit and the valve seat. In the dehumidifying valve that allows the dehumidifying operation to be performed by the air conditioner through the throttle portion formed from the valve chamber to the secondary side joint, the pulsation of the refrigerant flowing into the valve chamber from the primary side joint A pulsation absorbing member that absorbs energy is provided on the plunger side of the valve portion. And wherein the door.

  The dehumidifying valve according to claim 2 is the dehumidifying valve according to claim 1, wherein the valve portion and the plunger are connected by a valve shaft formed integrally with the valve portion, and the periphery of the connecting shaft A pulsation absorbing member is provided.

  A dehumidifying valve according to a third aspect is the dehumidifying valve according to the first aspect, wherein the valve portion and the plunger are connected via the pulsation absorbing member.

  A dehumidifying valve according to a fourth aspect is the dehumidifying valve according to the second aspect, wherein the pulsation absorbing member is fitted and fixed between the valve portion side bottom surface of the plunger and the plunger side upper surface of the valve portion. It is characterized by.

  According to the dehumidifying valve of the first aspect, the throttle portion that squeezes the refrigerant during dehumidification can be a groove formed by the valve portion and the valve seat when the valve portion is seated, and the groove does not cause clogging. Durability and low cost can be secured, and the pulsation absorbing member absorbs the pulsation energy of the refrigerant flowing into the valve chamber, so that the pulsation of the refrigerant can be reduced from the primary side joint to the valve chamber. Can be improved.

  According to the dehumidifying valve of the second aspect, in addition to the effect of the first aspect, since the valve portion moves through the valve shaft formed integrally with the valve portion, the operation of the plunger can be reliably transmitted to the valve portion. At the same time, no unnecessary load is applied to the pulsation absorbing member in the axial direction.

  According to the dehumidifying valve of the third aspect, in addition to the effect of the first aspect, the pulsation absorbing member also serves as the valve shaft, so that the member such as metal is more than the structure of the valve body having the valve shaft integrally with the valve portion. Since the refrigerant permeates the pulsation absorbing member, the bubbles in the refrigerant can be subdivided, and the quietness is further improved.

  According to the dehumidifying valve of the fourth aspect, in addition to the effect of the second aspect, the pulsation absorbing member is fitted and fixed between the valve portion side bottom surface of the plunger and the plunger side upper surface of the valve portion. The absorbing member can be securely held.

It is a longitudinal cross-sectional view at the time of the deenergization of the dehumidification valve of embodiment of this invention. It is a longitudinal cross-sectional view at the time of electricity supply of the dehumidification valve of embodiment of this invention. It is a figure which shows the 1st-7th Example of the pulsation absorption member in the dehumidification valve of embodiment of this invention. It is a figure which shows the modification of the valve body and pulsation absorption member in the dehumidification valve of embodiment of this invention.

  Next, an embodiment of the dehumidifying valve of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view when the dehumidifying valve of the embodiment is not energized, and FIG. 2 is a longitudinal sectional view when the dehumidifying valve is energized. Note that the concept of “upper and lower” in the following description corresponds to the upper and lower sides in the drawing of FIG.

  The dehumidifying valve of this embodiment has a substantially cylindrical main body case 1. The main body case 1 includes a large diameter portion 1a that forms the valve chamber 1A, a small diameter portion 1b that forms a plunger tube, and a step portion 1c that connects the large diameter portion 1a and the small diameter portion 1b. A stainless steel flanged valve seat member 2 is provided in the lower opening of the large-diameter portion 1a, and the main body case 1 and the flanged valve seat member 2 constitute a “valve housing”.

  An inlet port 11 is perforated in the wall portion of the large-diameter portion 1a of the main body case 1, and the primary-side joint 10 is inserted into the inlet port 11 and brazed so that the primary-side joint 10 becomes the large-diameter portion. Connected to 1a. That is, the primary side joint 10 communicates with the side portion of the valve chamber 1A. A stainless steel spring receiving member 14 is fixed to the inside of the stepped portion 1c by brazing.

  The flanged valve seat member 2 has a cylindrical portion 2a whose inner peripheral surface defines an outlet port 12, and a valve in which a circular valve port 13 provided between the valve chamber 1A and the outlet port 12 is defined. The seat portion 2b and the flange portion 2c brazed in a state where the outer peripheral edge portion is press-fitted into the inner peripheral surface of the opening portion of the large-diameter portion 1a of the main body case 1 are provided. The secondary side joint 20 is connected to the valve seat member 2 with the flange by inserting the secondary side joint 20 into the cylindrical portion 2a forming the port and brazing the outlet port 12. . That is, the secondary side joint 20 communicates with the end portion in the axis L direction of the valve chamber 1A. A plurality of throttle grooves 21 (see FIG. 1) carved from the valve chamber 1A side to the valve port 13 side are formed on the inner periphery of the valve seat portion 2b.

  A valve body 3 is provided in the valve chamber 1 </ b> A so as to be movable in the direction of the axis L of the main body case 1. The valve body 3 is formed by integrally forming a thin and substantially cylindrical valve portion 3a having a tapered surface at a lower portion and a cylindrical valve shaft 3b having a diameter smaller than that of the valve portion 3a. A pulsation absorbing member 4 shown in first to seventh embodiments described later is disposed around the valve shaft 3 b and is fitted to the valve body 3. The valve portion 3a is seated on the valve seat portion 2b by the operation of an electromagnetic solenoid device 6 to be described later, and the valve port 13 is closed from the position where the valve port 13 is closed (position in FIG. 2). It is possible to move between the valve open position (position shown in FIG. 1).

  Components of the electromagnetic solenoid device 6 as “electromagnetic drive units” are arranged inside and outside the small diameter portion 1 b of the main body case 1. The electromagnetic solenoid device 6 includes a cup-shaped plunger 61 made of a magnetic material and fitted between the plunger 61 and the spring receiving member 14 so as to be movable in the direction of the axis L in the small diameter portion 1b constituting the plunger tube. Plunger spring (valve opening spring) 62 by a compression coil spring provided, a lid member 63 hermetically fixed to the upper end opening of the small diameter portion 1b by welding, and a cylinder disposed on the outer periphery on the end portion side of the small diameter portion 1b On the outer periphery of the U-shaped magnetic member 64 fixed to the outer periphery of the large-diameter portion 1a by the fixing bracket 15, and on the outer periphery of the small-diameter portion 1b and the magnetic guide portion 64. And a coil portion 66 held by the outer casing 65.

  The inside of the small diameter portion 1b of the main body case 1 and the valve chamber 1A communicate with each other via a gap between the valve portion 3a and the spring receiving member 14, and the valve body 3 existing across the small diameter portion 1b and the valve chamber 1A is In the small diameter portion 1b, the stem portion 3b1 at the upper end of the valve shaft 3b is caulked to the bottom portion of the plunger 61. Then, the valve body 3 moves in the direction of the axis L integrally with the plunger 61. The pulsation absorbing member 4 is fitted to the valve shaft 3b before the valve body 3 is coupled to the plunger 61. The pulsation absorbing member 4 includes the bottom surface 61a (the bottom surface on the valve portion side) of the plunger 61 and the valve. It is fitted and fixed by being sandwiched between the upper surface 3a1 (upper surface on the plunger side) of the portion 3a.

  That is, as shown in FIG. 1, when the electromagnetic solenoid device 6 is not energized, the valve portion 3a (valve element 3) is in the valve open position separated from the valve seat portion 2b by the spring force of the plunger spring 62. Further, as shown in FIG. 2, when the electromagnetic solenoid device 6 is energized, the plunger 61 is magnetically attracted to the lower end side of the outer casing 65 against the spring force of the plunger spring 62, and the valve portion 3a (valve element 3). ) Is seated on the valve seat 2b.

  In this valve closed state, the valve chamber 1A and the outlet port 12 communicate with each other through the throttle groove 21 of the valve seat portion 2a, and the refrigerant from the primary side joint 10 expands only through the throttle groove 21, and the secondary side joint. 20 flows. Thereby, the throttling effect at the time of dehumidification operation is acquired. At this time, the refrigerant flowing into the valve chamber 1A from the primary side joint 10 is absorbed by the pulsation absorbing member 4 so that the pulsation that generates the groove passing sound is not generated.

  FIG. 3 (A) shows a first embodiment of the pulsation absorbing member 4, which is constituted by a sintered filter. The sintered filter is a porous member, and the pulsating energy of the refrigerant is absorbed by a large number of small holes on the surface thereof. Further, reflection of the pulsation of the refrigerant can be suppressed by the sintered filter.

  FIG. 3 (B) shows a second embodiment of the pulsation absorbing member 4, which is constituted by a demister filter. The demister filter is formed by pressing and solidifying a fibrous metal wire, and the pulsating energy of the refrigerant is absorbed by a large number of gaps between the metal wires. Further, reflection of the pulsation of the refrigerant by the demister filter can also be suppressed.

  FIG. 3C shows a third embodiment of the pulsation absorbing member 4, and this pulsation absorbing member 4 is made of a foam member (for example, foam metal). The foam member has a large number of voids, and the pulsating energy of the refrigerant is absorbed by the voids on the surface. Moreover, reflection of the pulsation of the refrigerant by the foamed member can also be suppressed.

  FIG. 3 (D) shows a fourth embodiment of the pulsation absorbing member 4, and this pulsation absorbing member 4 is formed by laminating a large number of annular flat plates (for example, made of metal). The pulsating energy of the refrigerant is absorbed by a large number of gaps between the flat plates. Further, reflection of the pulsation of the refrigerant by the large number of flat plates can be suppressed.

  FIG. 3 (E) shows a fifth embodiment of the pulsation absorbing member 4, and this pulsation absorbing member 4 is formed by laminating a large number of annular curved plates (for example, made of metal). The pulsating energy of the refrigerant is absorbed by a large number of gaps between the curved plates. Further, reflection of refrigerant pulsation by the large number of curved plates can also be suppressed.

  FIG. 3 (F) shows a sixth embodiment of the pulsation absorbing member 4, and this pulsation absorbing member 4 is composed of two layers of inner and outer coil springs. The coil spring has a large number of gaps, and the energy of the pulsation of the refrigerant is absorbed by the numerous gaps of the coil springs. Further, reflection of refrigerant pulsation by the coil spring can be suppressed. The coil spring may be a single layer, but a plurality of layers is more effective.

  FIG. 3 (G) shows a seventh embodiment of the pulsation absorbing member 4, and this pulsation absorbing member 4 is composed of two layers of punching metal inside and outside. The punching metal has a large number of small holes, and the pulsating energy of the refrigerant is absorbed by the large number of small holes in the punching metal. Moreover, it can also suppress that the pulsation of a refrigerant | coolant is reflected by this punching metal. The punching metal may be a single layer, but a plurality of layers is more effective.

  In the first to third embodiments, the sixth embodiment, and the seventh embodiment, the pulsation absorbing member 4 is sandwiched between the bottom surface 61a of the plunger 61 and the top surface 3a1 of the valve portion 3a as described above. Thereby, the pulsation absorbing member 4 can be reliably held. Even in the case of the fourth and fifth embodiments, a spacer or the like is appropriately provided between a plurality of flat plates or a plurality of curved plates, and is held by being sandwiched between the bottom surface 61a of the plunger 61 and the top surface 3a1 of the valve portion 3a. You can also.

  FIG. 4 is a view showing a modification of the embodiment of the valve portion and the pulsation absorbing member. In this modification, the valve body 5 includes a valve portion 5a, a valve shaft 5b, and a connecting portion 5c. The valve shaft 5b is a cylindrical porous body (for example, a sintered filter) serving as a “pulsation absorbing member”. It consists of The valve portion 5a is caulked and joined to the lower end of the valve shaft 5b by an outer rim portion 5a1. The connecting portion 5c is caulked and joined to the upper end of the valve shaft 5b by an outer rim portion 5c1. Also, the stem portion 5c2 of the connecting portion 5c is caulked and coupled to the bottom portion of the plunger 61. In this modification, the valve shaft 5b is composed of a porous body, and the energy of the pulsation of the refrigerant is absorbed by a large number of small holes on the surface thereof. Moreover, it can also suppress that the pulsation of a refrigerant | coolant reflects in this porous body (valve shaft 5b).

  In the case of this modification, the valve shaft 3b becomes unnecessary, and the material of the valve body can be reduced. In the case of the first to seventh embodiments, the bubbles in the refrigerant are subdivided when the refrigerant flowing in from the primary side joint 10 collides with the pulsation absorbing member. In this modification, the refrigerant is porous. Since it passes through the material (valve shaft 5b), the bubbles in the refrigerant can be further subdivided, and the quietness is improved as compared with the first to seventh embodiments. As described above, the conventional filter-type dehumidifying valve has a possibility that the filter itself may be clogged because the small hole is clogged with contamination or the area through which the refrigerant can pass through the filter is small. In this case, since the refrigerant can permeate the entire circumference of the porous body (valve shaft 5b), the porous body is less likely to be clogged. The valve shaft 5b is not limited to a porous body such as a sintered filter, a demister, or a foam metal, and may be configured by a pulsation absorbing member as in the fourth to seventh embodiments.

  As described above, the pulsation absorbing member 4 of the first to seventh embodiments and the valve shaft 5b (pulsation absorbing member) of the modification are provided on the plunger 61 side of the valve portions 3a and 5a. Since the pulsation energy of the refrigerant flowing from the primary side joint 10 is absorbed in the valve chamber 1A, the pulsation of the refrigerant can be reduced from the primary side joint 10 to the valve chamber 1A, and the quietness can be improved. .

  Note that the pulsation absorbing members of the first to seventh embodiments and the modified example also function as a sound absorbing material. That is, since a member having many holes and gaps such as a pulsation absorbing member exists in the valve chamber, noise caused by bursting of bubbles in the refrigerant generated when the refrigerant collides with the inner wall of the valve chamber, plunger This pulsation absorbing member also absorbs the operation sound and the collision sound generated when the valve body collides with the valve seat, so that the quietness can also be improved in this respect.

  In the above embodiment, the throttle groove (21) that throttles the refrigerant when the valve is closed is formed on the valve seat part (2a) side, but this throttle groove may be formed on the valve part side.

1 Body case (valve housing)
1A Valve chamber 1a Large diameter part 1b Small diameter part 1c Step part 2 Valve seat member with a flange (valve housing)
2b Valve seat part 21 Restriction groove 10 Primary side joint 20 Secondary side joint 3 Valve body 3a Valve part 3a1 Upper surface (upper surface on the plunger side)
3b Valve shaft 4 Pulsation absorbing member 5a Part 5b Valve shaft (Pulsation absorbing member)
6 Electromagnetic solenoid device (electromagnetic drive unit)
61 Plunger 61a Bottom (valve part bottom)
62 Plunger spring L axis

Claims (4)

A valve housing forming a valve chamber; the primary side joint communicating with the valve chamber of the valve housing; the secondary side joint communicating with an axial end of the valve chamber; and the secondary side joint A valve seat provided on the valve chamber side, a valve portion movably provided in the axial direction within the valve chamber and seated / separated with respect to the valve seat, and a plunger connected to the valve portion driven in the axial direction And an electromagnetic drive part that moves the valve part, and when the valve part is in a seated state, the refrigerant flowing from the primary side joint is passed through a throttle part formed by the valve part and the valve seat. In the dehumidifying valve that allows the dehumidifying operation to flow out from the valve chamber to the secondary side joint,
A dehumidification valve, wherein a pulsation absorbing member that absorbs energy of pulsation of refrigerant flowing into the valve chamber from the primary side joint is provided on the plunger side of the valve portion.   The dehumidification according to claim 1, wherein the valve portion and the plunger are connected by a valve shaft formed integrally with the valve portion, and the pulsation absorbing member is provided around the connection shaft. valve.   The dehumidifying valve according to claim 1, wherein the valve portion and the plunger are connected via the pulsation absorbing member.   The dehumidifying valve according to claim 2, wherein the pulsation absorbing member is sandwiched and fixed between a valve portion side bottom surface of the plunger and a plunger side top surface of the valve portion.

Images