JP6447906B2 - Expansion valve - Google Patents

Description

  The present invention relates to an expansion valve, and more particularly to a temperature type expansion valve suitable for a refrigeration cycle.

  The refrigeration cycle of an automotive air conditioner generally includes a compressor that compresses the circulating refrigerant, a condenser that condenses the compressed refrigerant, a receiver that separates the condensed refrigerant into gas and liquid, and the separated liquid refrigerant is squeezed and expanded. There are provided an expansion valve that is sent in the form of a mist, and an evaporator that evaporates the mist-like refrigerant and cools the air in the passenger compartment by the latent heat of evaporation. The expansion valve controls the flow rate of the refrigerant sent to the evaporator by sensing the temperature and pressure of the refrigerant on the outlet side of the evaporator and opening and closing the valve so that the refrigerant derived from the evaporator has a predetermined degree of superheat. A temperature expansion valve is used.

  In the body of the expansion valve, there are formed a first passage through which the refrigerant from the receiver to the evaporator passes and a second passage through which the refrigerant returned from the evaporator passes and is led to the compressor. A valve hole is formed in an intermediate portion of the first passage, and a valve body that opens and closes the valve portion by being attached to and detached from the valve hole is disposed. The valve body adjusts the flow rate of the refrigerant toward and away from the valve hole and toward the evaporator. In addition, a power element that senses the temperature and pressure of the refrigerant flowing through the second passage and controls the opening degree of the valve unit is provided at one end of the body. The driving force of the power element is transmitted to the valve body through a long shaft. One end side of the shaft is connected to the power element across the second passage. The other end side of the shaft is connected to the valve body through an insertion hole and a valve hole formed in a partition wall between the first passage and the second passage.

  The power element has a sealed space filled with a predetermined temperature-sensitive gas and an open space communicating with the second passage, and these spaces are partitioned by a diaphragm. A greenhouse is formed by the space surrounded by the power element and the body, and a part of the refrigerant flowing through the second passage enters and exits. The diaphragm is displaced or expanded as the sealed space expands or contracts according to the temperature and pressure of the refrigerant introduced into the greenhouse, and the displacement is transmitted to the shaft as a driving force. When the refrigerant temperature at the outlet of the evaporator decreases, the sealed space contracts, and the valve portion operates in the valve closing direction. On the contrary, since the sealed space expands when the refrigerant temperature increases, the valve portion operates in the valve opening direction. By such an autonomous operation of the power element, the opening degree of the valve unit is adjusted, and the degree of superheat of the refrigerant at the evaporator outlet is appropriately controlled.

  By the way, in such an expansion valve, liquid refrigerant may be sent from the outlet of the evaporator when the refrigeration cycle is under a low load. Since the liquid refrigerant has a smaller heat transfer time constant than the gas refrigerant, if the liquid refrigerant stays in the power element, there is a possibility of causing hunting in which the valve section frequently opens and closes. Therefore, in order to suppress such hunting, a technique for restricting the introduction of liquid refrigerant into the temperature sensitive room by connecting the temperature sensitive room and the second passage through a small diameter equalizing hole has been proposed (for example, a patent). Reference 1).

JP 2013-245921 A

  However, according to the configuration described in Patent Document 1, since the introduction of the refrigerant into the temperature-sensitive greenhouse itself is restricted, the power element cannot sense an accurate temperature and may cause a so-called temperature-sensitive error. There is. As a result, there is a concern that it will be difficult to exert the original function of the expansion valve.

  The present invention has been made in view of such a problem, and provides a temperature type expansion valve capable of exhibiting a good function while preventing control hunting even at a low load of a refrigeration cycle. is there.

  In one aspect of the present invention, the pressure and temperature of the refrigerant that is provided in the refrigeration cycle, is expanded by passing through the internal valve portion of the refrigerant that has flowed through the heat exchanger, supplied to the evaporator, and returned from the evaporator. Is an expansion valve that controls the opening degree of the valve portion and derives the refrigerant toward the compressor. The expansion valve is formed so as to penetrate the body, and is provided with a first introduction port for introducing the refrigerant from the heat exchanger on one end side, and on the other end side, a first introduction port for leading the refrigerant to the evaporator. A first passage provided with one outlet port, a valve hole provided in an intermediate portion of the first passage, a valve body that opens and closes the valve portion in contact with and away from the valve hole, and the first passage A second introduction port for introducing the refrigerant returned from the evaporator is provided on one end side so as to penetrate the body, and a second outlet port for deriving the refrigerant to the compressor is provided on the other end side. Provided on the opposite side of the first passage relative to the second passage of the body and attached to the body so as to seal the opening communicating with the second passage. Operates by sensing the temperature and pressure of the refrigerant flowing through the passage 2 The power element is connected to the power element at one end side across the second passage, and the other end side passes through the first partition and the valve hole between the first passage and the second passage. A shaft connected to the body and transmitting the driving force of the power element to the valve body.

  The power element includes a first housing, a second housing disposed opposite to the first housing, fixed to the body on the opposite side of the first housing, and in communication with the second passage, the first housing, and the second housing Arranged so as to partition the space surrounded by the housing, a diaphragm for holding a predetermined temperature sensitive gas sealed in a sealed space on the first housing side, and a diaphragm in contact with the diaphragm in the second housing And a disk with which the shaft abuts on the side opposite to the diaphragm.

  A space surrounded by the body, the second housing, and the diaphragm has a larger cross section than the opening, communicates with the second passage through the opening, and part of the refrigerant flowing through the second passage Forming a greenhouse to be introduced. The second partition wall between the second passage and the temperature-sensitive room is provided with a communication hole that allows the temperature-sensitive room and the second path to communicate with each other on the downstream side of the shaft. Thereby, the refrigerant introduced into the temperature-sensitive room from the second passage is configured to be guided to the communication hole along the wall surface of the downstream side end of the temperature-sensitive room and to be led to the downstream side of the second path.

  According to this aspect, the refrigerant flowing through the second passage is positively introduced into the temperature-sensitive room through the opening, while the refrigerant in the temperature-sensitive room is actively introduced to the downstream side of the second path through the communication hole. Can be derived. That is, the refrigerant introduced into the temperature-sensitive greenhouse is guided to the communication hole along the wall surface at the downstream end of the temperature-sensitive room, and is led to the downstream side of the second passage. As a result, even if the liquid refrigerant is introduced into the temperature-sensitive greenhouse, the liquid component is prevented or suppressed from staying in the temperature-sensitive room, and the time constant of heat transfer in the power element can be prevented from becoming excessively small. Thereby, control hunting can be prevented or suppressed. On the other hand, since the refrigerant is actively introduced into the temperature sensitive room, the power element can accurately sense the outlet temperature of the evaporator, and the original function of the expansion valve can be exhibited well.

  Another embodiment of the present invention is also an expansion valve. The expansion valve is formed in the second partition wall at a downstream side of the shaft and spaced apart from the opening, and is provided with a communication hole that allows the temperature-sensitive greenhouse and the second passage to communicate with each other. The refrigerant is configured to be led out downstream of the second passage. According to this aspect, the refrigerant introduced into the temperature sensitive greenhouse is led to the downstream side of the temperature sensitive greenhouse, and is led to the downstream side of the second passage through the communication hole. Thereby, similarly to the said aspect, control hunting can be prevented or suppressed. On the other hand, since the refrigerant is actively introduced into the temperature sensitive room, the power element can accurately sense the outlet temperature of the evaporator, and the original function of the expansion valve can be exhibited well.

  Yet another embodiment of the present invention is also an expansion valve. This expansion valve is provided with a communication hole that allows the second partition to communicate with the temperature-sensitive room and the second passage. The communication hole has an opening length along the upstream / downstream direction of the second passage larger than the opening width in the direction perpendicular to the upstream / downstream direction. According to this aspect, the communication hole is enlarged along the upstream and downstream directions of the second passage, so that the liquid refrigerant is positively introduced into the sensitive room and the refrigerant in the sensitive room is downstream of the second passage. It becomes easy to lead out to the side. Thereby, similarly to the said aspect, control hunting can be prevented or suppressed and the original function of an expansion valve can be exhibited favorably.

  ADVANTAGE OF THE INVENTION According to this invention, the temperature type expansion valve which can exhibit a function favorably can be provided, preventing control hunting at the time of the low load of a refrigerating cycle.

It is sectional drawing of the expansion valve which concerns on embodiment. It is a figure showing the temperature-sensitive greenhouse of a power element, and its surrounding structure. It is a figure showing the temperature-sensitive greenhouse which concerns on a modification, and the structure of its periphery. It is a figure showing the structure of the temperature sensitive room which concerns on another modification, and its periphery.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following description, for the sake of convenience, the positional relationship between the structures may be expressed based on the illustrated state. In the following embodiments and modifications thereof, substantially the same components are denoted by the same reference numerals, and the description thereof may be omitted as appropriate.

  In this embodiment, the expansion valve of the present invention is embodied as a temperature type expansion valve applied to a refrigeration cycle of an automobile air conditioner. In this refrigeration cycle, a compressor that compresses the circulating refrigerant, a condenser that condenses the compressed refrigerant, a receiver that separates the condensed refrigerant into gas and liquid, and the separated liquid refrigerant is squeezed and expanded into a mist. An expansion valve and an evaporator that evaporates the mist-like refrigerant and cools the air in the passenger compartment by the latent heat of vaporization are provided, but detailed description other than the expansion valve is omitted.

FIG. 1 is a cross-sectional view of an expansion valve according to an embodiment.
The expansion valve 1 has a body 2 formed by subjecting a member obtained by extruding a material made of an aluminum alloy to a predetermined cutting process. The body 2 has a prismatic shape, and a valve portion is provided in the body 2 for performing expansion and expansion of the refrigerant. A power element 3 that functions as a temperature sensing unit is provided at an end of the body 2 in the longitudinal direction.

  An introduction port 6 for introducing high-temperature / high-pressure liquid refrigerant from the receiver side (capacitor side) to the side portion of the body 2, and a derivation for deriving low-temperature / low-pressure refrigerant expanded by the expansion valve 1 toward the evaporator. A port 7, an introduction port 8 for introducing the refrigerant evaporated by the evaporator, and a lead-out port 9 for leading the refrigerant that has passed through the expansion valve 1 to the compressor side are provided. A screw hole 10 is formed between the introduction port 6 and the lead-out port 9 so that a stud bolt for pipe attachment (not shown) can be implanted. A pipe joint is connected to each port.

  In the expansion valve 1, a first passage 13 is constituted by the introduction port 6, the outlet port 7, and the refrigerant passage connecting them. The first passage 13 is provided with a valve portion at an intermediate portion thereof, and the refrigerant introduced from the introduction port 6 is squeezed and expanded at the valve portion to form a mist, and is led out from the lead-out port 7 toward the evaporator. To do. On the other hand, a second passage 14 (corresponding to a “return passage”) is constituted by the introduction port 8, the outlet port 9, and the refrigerant passage connecting them. The second passage 14 extends straight, introduces the refrigerant from the introduction port 8, and guides it from the outlet port 9 toward the compressor.

  A valve hole 16 is provided in an intermediate portion of the first passage 13 in the body 2, and a valve seat 17 is formed by an opening edge of the valve hole 16 on the introduction port 6 side. A valve body 18 is disposed so as to face the valve seat 17 from the introduction port 6 side. The valve body 18 is configured by joining a spherical ball valve body that attaches and detaches to the valve seat 17 to open and close the valve portion, and a valve body receiver that supports the ball valve body from below.

  A communication hole 19 is formed in the lower end portion of the body 2 so as to communicate the inside and the outside so as to be orthogonal to the first passage 13, and a valve chamber 40 for accommodating the valve body 18 is formed by the upper half portion thereof. . The valve chamber 40 communicates with the valve hole 16 at the upper end portion thereof and communicates with the introduction port 6 through the small hole 42 at the side portion, and constitutes a part of the first passage 13. The small hole 42 is formed by locally narrowing the passage section of the first passage 13 and opens to the valve chamber 40.

  An adjustment screw 20 is screwed to the lower half of the communication hole 19 so as to seal the communication hole 19 from the outside. A spring 23 that biases the valve body 18 in the valve closing direction is interposed between the valve body 18 (more precisely, the valve body receiver) and the adjusting screw 20. By adjusting the screwing amount of the adjustment screw 20 into the body 2, the load of the spring 23 can be adjusted. An O-ring 24 is interposed between the adjusting screw 20 and the body 2 to prevent refrigerant leakage.

  On the other hand, a concave portion 50 (bottomed mounting hole) is provided at the upper end portion of the body 2, and an opening portion 52 is provided at the bottom portion of the concave portion 50 to communicate the inside and outside. The lower part of the power element 3 is screwed into the recess 50 and is assembled to the body 2 so as to seal the opening 52. A greenhouse 25 is formed by the space between the recess 50 and the power element 3. A communication hole 56 that communicates the downstream side of the second passage 14 and the temperature-sensitive room 54 is provided at the downstream end of the recess 50.

  The power element 3 is configured such that a diaphragm 28 is interposed between an upper housing 26 and a lower housing 27, and a disk 29 is disposed on the lower housing 27 side. The upper housing 26 is obtained by press-molding a stainless material into a covered shape, and functions as a “first housing”. The lower housing 27 is obtained by press-molding a stainless material into a stepped cylindrical shape, and functions as a “second housing”. The disk 29 is made of, for example, aluminum or an aluminum alloy, and has a higher thermal conductivity than both housings. The diaphragm 28 is made of a thin metal plate in this embodiment, but may be made of a thin film resin material such as a polyimide film.

  The power element 3 is assembled such that the openings of the upper housing 26 and the lower housing 27 are abutted against each other, and the outer edge of the diaphragm 28 is sandwiched between the outer edges of the upper housing 26 and the lower housing 27. Is formed into a container shape. The inside of the power element 3 is partitioned into a sealed space S1 and an open space S2 by a diaphragm 28, and a gas for temperature sensing is sealed in the sealed space S1. The open space S2 communicates with the second passage 14 through the opening 52. An O-ring 30 is interposed between the power element 3 and the body 2 to prevent refrigerant leakage. The pressure and temperature of the refrigerant passing through the second passage 14 are transmitted to the lower surface of the diaphragm 28 through the opening 52 and the groove 53 provided in the disk 29. Further, the temperature of the refrigerant is transmitted to the diaphragm 28 mainly through the disk 29 having a high thermal conductivity.

  In the central portion of the body 2, a stepped hole 34 (“insertion hole”) is provided so as to pass through a partition wall 35 (corresponding to a “first partition wall”) between the first passage 13 and the second passage 14. The long shaft 33 is slidably inserted into the small diameter portion 44 of the stepped hole 34. The shaft 33 is a metal (for example, stainless steel) rod, and is interposed between the disk 29 and the valve body 18. Thereby, the driving force due to the displacement of the diaphragm 28 is transmitted to the valve body 18 through the disk 29 and the shaft 33, and the valve portion is opened and closed.

  The upper half portion of the shaft 33 crosses the second passage 14, and the lower half portion slidably penetrates the small diameter portion 44 of the stepped hole 34. An anti-vibration spring for applying an urging force in a direction perpendicular to the axial direction to the shaft 33, that is, a lateral load (sliding load), on the large-diameter portion 46 (functioning as an “attachment hole”) of the stepped hole 34 48 is housed. When the shaft 33 receives the lateral load of the vibration-proof spring 48, the vibration of the shaft 33 and the valve body 18 due to the fluctuation of the refrigerant pressure is suppressed. In addition, about the specific structure of the anti-vibration spring 48, since the structure of Unexamined-Japanese-Patent No. 2013-242129 is employable, the detailed description is abbreviate | omitted.

  In the expansion valve 1 configured as described above, the power element 3 senses the pressure and temperature of the refrigerant returned from the evaporator via the introduction port 8, and the diaphragm 28 is displaced. The displacement of the diaphragm 28 becomes a driving force and is transmitted to the valve body 18 through the disk 29 and the shaft 33 to open and close the valve portion. On the other hand, the liquid refrigerant supplied from the receiver is introduced from the introduction port 6 and is squeezed and expanded by passing through the valve portion to become a low-temperature / low-pressure mist refrigerant. The refrigerant is led out from the lead-out port 7 toward the evaporator.

Next, the temperature sensitive structure of the power element will be described in detail.
FIG. 2 is a diagram illustrating the temperature-sensitive greenhouse of the power element 3 and the surrounding structure. (A) is the upper part enlarged view of FIG. (B) is AA arrow sectional drawing of (A).

  As shown in FIGS. 2A and 2B, a recess 50 having a circular cross section with a predetermined depth is provided in the upper center of the body 2, and an internal thread 60 is formed on the inner peripheral surface of the recess 50. ing. In the center of the bottom of the recess 50, an opening 52 made of a circular hole is provided. The inner diameter of the opening 52 is sufficiently smaller than the inner diameter of the recess 50 and sufficiently larger than the outer diameter of the shaft 33. That is, the cross section of the sensation greenhouse 54 is sufficiently larger than the cross section of the opening 52. The opening 52 and the recess 50 are formed coaxially with the shaft 33. The communication hole 56 is formed so as to pass through a partition wall 62 (corresponding to a “second partition wall”) between the temperature-sensitive room 54 and the second passage 14, and is located downstream of the shaft 33. And the second passage 14 are communicated with each other. As illustrated, the communication hole 56 is formed at a position separated from the opening 52.

  One end of the communication hole 56 opens to the downstream end of the temperature-sensitive room 54, and the other end opens to the second passage 14 on the downstream side of the one end. That is, the communication hole 56 is an oblique passage that goes to the downstream side of the second passage 14 from the temperature-sensitive greenhouse 54 toward the second passage 14. The passage cross section of the communication hole 56 is smaller than the cross section of the opening 52, but is sufficiently large to promote the derivation of the refrigerant. As described above, the communication hole 56 is formed as an oblique passage toward the second passage 14 toward the downstream side thereof, so that the refrigerant flowing through the second passage 14 enters the sensitive room 54 via the communication hole 56. Can be prevented. Further, by using such an oblique passage, interference with the female screw portion 60 can be avoided even if the communication hole 56 is opened at the downstream end portion of the temperature sensing chamber 54. For this reason, there are merits that the processing of the communication hole 56 is easy and the length of the female screw portion 60 can be sufficiently secured.

  A locking surface 64 is formed on the upper surface of the body 2. The bottom surface 66 and the locking surface 64 of the recess 50 are simultaneously formed by a single cutting tool (such as an end mill having a stepped blade), and the height management of the locking surface 64 with respect to the bottom surface 66 is realized with high accuracy. Yes. Further, a circular fitting groove 68 concentric with the recess 50 is formed on the locking surface 64, and the O-ring 30 is fitted.

  On the other hand, in the power element 3, the lower housing 27 has a stepped cylindrical shape that gradually decreases in diameter toward the lower side, and a lower half of the lower housing 27 constitutes a cylindrical fitting portion 70. A male screw portion 72 that can be screwed with the female screw portion 60 is formed on the outer peripheral surface of the cylindrical fitting portion 70. The lower housing 27 is attached to the body 2 by screwing the cylindrical fitting portion 70 into the recess 50. A proximal end portion of the cylindrical fitting portion 70 in the lower housing 27 is a locking surface 80 perpendicular to the axis, and is configured to be able to contact the locking surface 64 of the body 2.

  When the power element 3 is assembled to the body 2, the lower housing 27 is screwed into the recess 50 with the O-ring 30 fitted in the fitting groove 68. Thereby, the O-ring 30 is crushed and brought into close contact with both the power element 3 and the body 2 to realize an elastic seal. When the lower housing 27 is screwed in in this way, the locking surface 80 comes into contact with the locking surface 64 and the lower housing 27 is locked to the body 2, and the assembly of the power element 3 to the body 2 is completed. . In the assembled state, the tip (opening end) of the cylindrical fitting portion 70 is separated from the bottom surface 66 of the recess 50 by a predetermined amount, as shown. A space surrounded by the recess 50, the lower housing 27, and the diaphragm 28 forms a greenhouse 25.

  According to such a configuration, the refrigerant sent from the evaporator flows as shown by solid line arrows in the figure. That is, most of the refrigerant introduced from the introduction port 8 goes straight through the second passage 14 and is led out from the lead-out port 9. On the other hand, a part of the refrigerant is introduced into the temperature sensing chamber 54 through the opening 52 and supplied to the power element 3 to sense its temperature and pressure. The refrigerant introduced into the temperature-sensitive room 54 is led out to the second passage 14 from the opening 52, or is guided to the communication hole 56 along the wall surface at the downstream end of the temperature-sensitive room 54, and the second passage. 14 downstream.

  As described above, according to the present embodiment, the refrigerant flowing through the second passage 14 is positively introduced into the temperature-sensitive greenhouse 54 through the opening 52, while the refrigerant in the temperature-sensitive room 54 is connected to the communication hole 56. Can be actively led to the downstream side of the second passage 14. Thereby, even if the liquid refrigerant is introduced into the sensation greenhouse 54, it is prevented or suppressed that the liquid component stays in the sensation greenhouse 54, and the time constant of heat transfer in the power element 3 becomes too small. Can be prevented. Thereby, hunting of the valve operation can be prevented or suppressed. On the other hand, since the refrigerant is actively introduced into the sensation greenhouse 54, the power element 3 can accurately sense the outlet temperature of the evaporator, and the original function of the expansion valve 1 can be exhibited well.

  The preferred embodiments of the present invention have been described above. However, the present invention is not limited to specific embodiments, and various modifications can be made within the scope of the technical idea of the present invention. Absent.

  In the above-described embodiment, the example in which the communication hole 56 is formed separately from the opening 52 has been described. In other variations, other structures can be employed. FIG. 3 is a diagram illustrating a temperature-sensitive room and its surrounding structure according to a modification. (A) corresponds to the upper enlarged view of FIG. (B) is AA arrow sectional drawing of (A).

  As shown in FIGS. 3A and 3B, in this modification, the communication hole 256 has a rectangular shape, and is formed integrally with the opening 52 in the partition wall 62. That is, the communication hole 256 is formed so as to open continuously with the opening 52 on the downstream side of the shaft 33. Even with such a configuration, it is possible to positively introduce the refrigerant into the temperature-sensitive greenhouse 54 while actively introducing the refrigerant in the temperature-sensitive room 54 through the communication hole 256. That is, the same effect as the above embodiment can be obtained.

  FIG. 4 is a diagram illustrating a temperature-sensitive room and other surrounding structures according to another modification. (A) corresponds to the upper enlarged view of FIG. (B) is AA arrow sectional drawing of (A). 4A and 4B, in this modification, the communication hole 356 is separated from the opening 52 in the partition wall 62, and the downstream end wall of the recess 50 (the downstream end of the temperature-sensitive room 54). It is formed at a position separated from the wall of the part. The communication hole 356 is closer to the downstream end wall of the recess 50 than the opening 52 is. Even with such a configuration, the refrigerant is positively introduced into the temperature-sensitive greenhouse 54, while the refrigerant in the temperature-sensitive greenhouse 54 can be actively led to the downstream side of the second passage 14 through the communication hole 356. it can. That is, the same effect as the above embodiment can be obtained.

  In the above embodiment and the modification, an example of the communication hole for leading the refrigerant from the temperature-sensitive room 54 has been shown, but the structure of the communication hole and the positional relationship between the opening 52 and the communication hole adopt other structures. You can also That is, various structures can be employed as long as the temperature-sensitive greenhouse 54 and the second passage 14 are communicated with each other downstream of the shaft 33.

  For example, in the modification shown in FIG. 3, the opening width of the communication hole 256 (opening width in the direction perpendicular to the upstream and downstream direction of the second passage 14) may be made as large as the diameter of the opening 52. Further, a communication hole may be provided on the upstream side of the opening 52. That is, an opening (communication hole) that opens from the upstream side to the downstream side of the shaft 33 so as to sandwich the opening 52 may be provided. In that case, the opening length of the opening along the upstream / downstream direction of the second passage 14 is made larger than the opening width in the direction perpendicular to the upstream / downstream direction. According to such a configuration, the opening is enlarged along the upstream and downstream directions of the second passage, so that the refrigerant is positively introduced into the temperature-sensitive room and the refrigerant in the temperature-sensitive room is passed through the second path. It becomes easy to guide to the downstream side. Thereby, the effect similar to the said embodiment can be acquired.

  The expansion valve of the above embodiment is suitably applied to a refrigeration cycle that uses an alternative chlorofluorocarbon (HFC-134a) or the like as a refrigerant. However, the expansion valve of the present invention uses a refrigerant having a high operating pressure such as carbon dioxide. It is also possible to apply to a cycle. In that case, an external heat exchanger such as a gas cooler is disposed in place of the condenser in the refrigeration cycle. At this time, in order to supplement the strength of the diaphragm constituting the power element 3, for example, a metal disc spring or the like may be arranged in an overlapping manner.

  In the said embodiment, the example which comprises the said expansion valve as what expands and expands the refrigerant | coolant which flowed in via the external heat exchanger, and supplies it to an evaporator (indoor evaporator) was shown. In the modification, the expansion valve may be applied to a heat pump type vehicle air conditioner and installed on the downstream side of the internal heat exchanger. That is, you may comprise the said expansion valve as what expands and expands the refrigerant | coolant which flowed in through the internal heat exchanger, and supplies it to an external heat exchanger (outdoor evaporator).

  In addition, this invention is not limited to the said embodiment and modification, A component can be deform | transformed and embodied in the range which does not deviate from a summary. Various inventions may be formed by appropriately combining a plurality of constituent elements disclosed in the above embodiments and modifications. Moreover, you may delete some components from all the components shown by the said embodiment and modification.

  DESCRIPTION OF SYMBOLS 1 Expansion valve, 2 Body, 3 Power element, 6 Introducing port, 7 Deriving port, 8 Introducing port, 9 Deriving port, 13 1st channel | path, 14 2nd channel | path, 16 Valve hole, 18 Valve body, 26 Upper housing , 27 Lower housing, 28 Diaphragm, 29 Disc, 33 Shaft, 34 Stepped hole, 35 Bulkhead, 50 Recess, 52 Opening, 54 Sensitive greenhouse, 56 Communication hole, 62 Bulkhead, 70 Cylindrical fitting part, 256 Communication hole , 356 communication hole, S1 sealed space, S2 open space.

Claims (6)

The refrigerant provided in the refrigeration cycle is expanded by passing through the internal valve portion through the heat exchanger and supplied to the evaporator, and the pressure and temperature of the refrigerant returned from the evaporator are sensed and the valve An expansion valve that controls the opening of the part and leads the refrigerant toward the compressor,
A first introduction port is formed so as to penetrate the body, and a first introduction port for introducing the refrigerant from the heat exchanger is provided on one end side, and a first outlet port for leading the refrigerant to the evaporator on the other end side. A first passage provided with,
A valve hole provided in an intermediate portion of the first passage;
A valve body that opens and closes the valve portion in contact with and apart from the valve hole;
Separately from the first passage, it is formed so as to penetrate the body, and a second introduction port for introducing the refrigerant returned from the evaporator is provided on one end side, while the refrigerant is supplied to the compressor on the other end side. A second passage provided with a second outlet port for leading to
The second passage of the body is provided on the opposite side of the first passage, and is attached to the body so as to seal an opening communicating with the second passage. A power element that operates by sensing the temperature and pressure of the refrigerant flowing through the passage,
One end side crosses the second passage and passes through the opening and is connected to the power element, and the other end side is a first partition between the first passage and the second passage, and the A shaft that penetrates the valve hole and is connected to the valve body, and transmits the driving force of the power element to the valve body;
With
The power element is
A first housing;
A second housing disposed opposite to the first housing, fixed to the body on the opposite side of the first housing and communicating with the second passage;
A diaphragm that is disposed so as to partition a space surrounded by the first housing and the second housing, and that holds a predetermined temperature-sensitive gas in a sealed space on the first housing side;
A disk disposed in the second housing so as to contact the diaphragm, and the shaft abutting on a side opposite to the diaphragm;
Including
A space surrounded by the body, the second housing, and the diaphragm has a larger cross section than the opening, communicates with the second passage through the opening, and flows through the second passage. Forming a greenhouse that allows some refrigerant to be introduced and extracted,
In the second partition wall between the second passage and the temperature-sensitive room in the body, the temperature-sensitive room and the second wall along the wall surface of the downstream end of the temperature-sensitive room on the downstream side of the shaft. A communication hole is provided for communicating with the other passage, and the refrigerant introduced into the temperature-sensitive room from the second passage can be led out to the downstream side of the second passage through the communication hole,
The greenhouse is formed by a space surrounded by the second housing, the diaphragm, and the second partition,
Each of the opening and the communication hole is a hole formed in the second partition wall,
The opening area of the opening is larger than the opening area of the communication hole,
An expansion valve, wherein the opening constitutes an inlet for refrigerant from the second passage to the temperature-sensitive room, and the communication hole constitutes an outlet for refrigerant from the temperature-sensitive room to the second passage. .   The expansion valve according to claim 1, wherein the communication hole is a through-hole formed in the second partition wall so as to be separated from the opening. The refrigerant provided in the refrigeration cycle is expanded by passing through the internal valve portion through the heat exchanger and supplied to the evaporator, and the pressure and temperature of the refrigerant returned from the evaporator are sensed and the valve An expansion valve that controls the opening of the part and leads the refrigerant toward the compressor,
A first introduction port is formed so as to penetrate the body, and a first introduction port for introducing the refrigerant from the heat exchanger is provided on one end side, and a first outlet port for leading the refrigerant to the evaporator on the other end side. A first passage provided with,
A valve hole provided in an intermediate portion of the first passage;
A valve body that opens and closes the valve portion in contact with and apart from the valve hole;
Separately from the first passage, it is formed so as to penetrate the body, and a second introduction port for introducing the refrigerant returned from the evaporator is provided on one end side, while the refrigerant is supplied to the compressor on the other end side. A second passage provided with a second outlet port for leading to
The second passage of the body is provided on the opposite side of the first passage, and is attached to the body so as to seal an opening communicating with the second passage. A power element that operates by sensing the temperature and pressure of the refrigerant flowing through the passage,
One end side crosses the second passage and is connected to the power element, and the other end side passes through the first partition and the valve hole between the first passage and the second passage. A shaft connected to the valve body and transmitting a driving force of the power element to the valve body;
With
The power element is
A first housing;
A second housing disposed opposite to the first housing, fixed to the body on the opposite side of the first housing and communicating with the second passage;
A diaphragm that is disposed so as to partition a space surrounded by the first housing and the second housing, and that holds a predetermined temperature-sensitive gas in a sealed space on the first housing side;
A disk disposed in the second housing so as to contact the diaphragm, and the shaft abutting on a side opposite to the diaphragm;
Including
A space surrounded by the body, the second housing, and the diaphragm has a larger cross section than the opening, communicates with the second passage through the opening, and flows through the second passage. Forming a greenhouse that allows some refrigerant to be introduced and extracted,
In the second partition between the second passage and the temperature-sensitive room, the temperature-sensitive room and the second passage along the wall surface of the downstream end of the temperature-sensitive room on the downstream side of the shaft. A communication hole is provided, and the refrigerant introduced into the temperature-sensitive room from the second passage can be led out to the downstream side of the second passage through the communication hole.
Rise expansion valve wherein the communication hole, in said second partition are formed integrally with the opening, it characterized by continuously opening and the opening on the downstream side of the shaft. The refrigerant provided in the refrigeration cycle is expanded by passing through the internal valve portion through the heat exchanger and supplied to the evaporator, and the pressure and temperature of the refrigerant returned from the evaporator are sensed and the valve An expansion valve that controls the opening of the part and leads the refrigerant toward the compressor,
A first introduction port is formed so as to penetrate the body, and a first introduction port for introducing the refrigerant from the heat exchanger is provided on one end side, and a first outlet port for leading the refrigerant to the evaporator on the other end side. A first passage provided with,
A valve hole provided in an intermediate portion of the first passage;
A valve body that opens and closes the valve portion in contact with and apart from the valve hole;
Separately from the first passage, it is formed so as to penetrate the body, and a second introduction port for introducing the refrigerant returned from the evaporator is provided on one end side, while the refrigerant is supplied to the compressor on the other end side. A second passage provided with a second outlet port for leading to
The second passage of the body is provided on the opposite side of the first passage, and is attached to the body so as to seal an opening communicating with the second passage. A power element that operates by sensing the temperature and pressure of the refrigerant flowing through the passage,
One end side crosses the second passage and passes through the opening and is connected to the power element, and the other end side is a first partition between the first passage and the second passage, and the A shaft that penetrates the valve hole and is connected to the valve body, and transmits the driving force of the power element to the valve body;
With
The power element is
A first housing;
A second housing disposed opposite to the first housing, fixed to the body on the opposite side of the first housing and communicating with the second passage;
A diaphragm that is disposed so as to partition a space surrounded by the first housing and the second housing, and that holds a predetermined temperature-sensitive gas in a sealed space on the first housing side;
A disk disposed in the second housing so as to contact the diaphragm, and the shaft abutting on a side opposite to the diaphragm;
Including
A space surrounded by the body, the second housing, and the diaphragm has a larger cross section than the opening, communicates with the second passage through the opening, and flows through the second passage. Forming a greenhouse that allows some refrigerant to be introduced and extracted,
A second partition wall between the second passage and the temperature-sensitive room in the body is formed on the downstream side of the shaft and separated from the opening, and the temperature-sensitive room and the second path are A communication hole is provided, and the refrigerant introduced into the temperature-sensitive room is configured to be led out to the downstream side of the second passage through the communication hole.
The greenhouse is formed by a space surrounded by the second housing, the diaphragm, and the second partition,
Each of the opening and the communication hole is a hole formed in the second partition wall,
The opening area of the opening is larger than the opening area of the communication hole,
An expansion valve, wherein the opening constitutes an inlet for refrigerant from the second passage to the temperature-sensitive room, and the communication hole constitutes an outlet for refrigerant from the temperature-sensitive room to the second passage. . The refrigerant provided in the refrigeration cycle is expanded by passing through the internal valve portion through the heat exchanger and supplied to the evaporator, and the pressure and temperature of the refrigerant returned from the evaporator are sensed and the valve An expansion valve that controls the opening of the part and leads the refrigerant toward the compressor,
A first introduction port is formed so as to penetrate the body, and a first introduction port for introducing the refrigerant from the heat exchanger is provided on one end side, and a first outlet port for leading the refrigerant to the evaporator on the other end side. A first passage provided with,
A valve hole provided in an intermediate portion of the first passage;
A valve body that opens and closes the valve portion in contact with and apart from the valve hole;
Separately from the first passage, it is formed so as to penetrate the body, and a second introduction port for introducing the refrigerant returned from the evaporator is provided on one end side, while the refrigerant is supplied to the compressor on the other end side. A second passage provided with a second outlet port for leading to
The second passage of the body is provided on the opposite side of the first passage, and is attached to the body so as to seal an opening communicating with the second passage. A power element that operates by sensing the temperature and pressure of the refrigerant flowing through the passage,
One end side crosses the second passage and is connected to the power element, and the other end side passes through the first partition and the valve hole between the first passage and the second passage. A shaft connected to the valve body and transmitting a driving force of the power element to the valve body;
With
The power element is
A first housing;
A second housing disposed opposite to the first housing, fixed to the body on the opposite side of the first housing and communicating with the second passage;
A diaphragm that is disposed so as to partition a space surrounded by the first housing and the second housing, and that holds a predetermined temperature-sensitive gas in a sealed space on the first housing side;
A disk disposed in the second housing so as to contact the diaphragm, and the shaft abutting on a side opposite to the diaphragm;
Including
A space surrounded by the body, the second housing, and the diaphragm has a larger cross section than the opening, communicates with the second passage through the opening, and flows through the second passage. Forming a greenhouse that allows some refrigerant to be introduced and extracted,
The second partition wall between the second passage and the temperature-sensitive room is provided with a communication hole for communicating the temperature-sensitive room and the second passage,
The communication hole has an opening length along the upstream / downstream direction of the second passage larger than an opening width in a direction perpendicular to the upstream / downstream direction ,
An expansion valve , wherein an inner diameter of the opening is made larger than an opening width of the communication hole . A recess is provided at an end of the body, and the opening is provided at the bottom of the recess;
The power element is assembled to the body so that the opening end of the second housing is inserted into the recess,
The expansion valve according to any one of claims 1 to 5, wherein a space surrounded by the recess, the second housing, and the diaphragm forms the greenhouse.

Images