JP6191491B2 - Ejector - Google Patents

Description

  The present invention relates to an ejector that is a momentum transporting pump that depressurizes a fluid and transports the fluid by a suction action of a working fluid ejected at a high speed.

  Conventionally, as an ejector applied to a vapor compression refrigeration cycle, one disclosed in Patent Document 1 is known.

  This type of ejector includes a nozzle that depressurizes the refrigerant condensed and liquefied by the condenser after being compressed to a high pressure by a compressor, a suction unit that sucks low-pressure refrigerant that has flowed out of the evaporator, and a refrigerant ejected from the nozzle and a suction unit. A diffuser for mixing and increasing the pressure of the refrigerant sucked in is provided.

  Here, in patent document 1, the following characteristic structure is employ | adopted in order to implement | achieve the ejector which can exhibit high nozzle efficiency irrespective of the load fluctuation of a refrigerating cycle, without causing the enlargement of a physique. . That is, in the ejector of Patent Document 1, a swirling space for swirling the refrigerant flowing from the refrigerant inlet is formed between the refrigerant inlet into which the refrigerant flows and the nozzle passage inside the body.

  According to this, by the revolving of the refrigerant in the swirling space, the refrigerant pressure on the swiveling center side is reduced to the pressure at which it becomes a saturated liquid phase refrigerant or the pressure at which the refrigerant is boiled under reduced pressure, and the refrigerant having this reduced pressure functions as a nozzle. It can flow into the nozzle passage. For this reason, the refrigerant can be boiled under reduced pressure in the vicinity of the portion where the passage area in the nozzle passage becomes the minimum regardless of the load fluctuation of the refrigeration cycle, and the energy conversion efficiency (equivalent to the nozzle efficiency) in the nozzle passage can be improved. It becomes possible.

  In the ejector of Patent Document 1, a passage forming member that forms a nozzle passage and a diffuser passage is disposed in a pressure reducing space and a pressure increasing space formed inside the body, and the passage forming member is separated from the pressure reducing space. As a result, the cross-sectional area increases.

  By adopting the passage forming member having such a shape, the shape of the diffuser passage can be made to expand along the outer periphery of the passage forming member as the distance from the decompression space increases. As a result, it is possible to suppress an increase in the dimension of the passage forming member in the axial direction and to suppress an increase in the size of the ejector.

  Furthermore, the ejector of Patent Document 1 includes a drive unit that displaces the passage forming member. For example, this driving means is displaced according to the pressure change of the temperature-sensitive medium in the enclosed space in which the gaseous temperature-sensitive medium whose pressure changes with the temperature change of the refrigerant flowing out of the evaporator is enclosed. It has a thin plate-like diaphragm. The enclosure space and the diaphragm are formed in an annular shape so as to surround the axis of the passage forming member. The diaphragm is connected to the passage forming member and is adapted to displace the passage forming member in accordance with the temperature change of the refrigerant flowing out of the evaporator.

  By adopting such a drive means, the passage forming member is displaced according to the load fluctuation of the refrigeration cycle, and the passage area of the nozzle passage and the diffuser passage is adjusted to operate the ejector corresponding to the load of the refrigeration cycle. Is realized.

JP 2013-177879 A

  By the way, this inventor examined the diaphragm J251 of the structure as described below as a diaphragm of above-mentioned patent document 1. As shown in FIG. Below, this is called the diaphragm of the examination example.

  As shown in FIG. 19, the diaphragm J251 of this examination example is formed in an annular shape, and includes a pressure receiving portion J251a, an inner peripheral edge portion J251b, and an outer peripheral edge portion J251c. The pressure receiving portion J251a is a portion between the inner peripheral edge portion J251b and the outer peripheral edge portion J251c, and is a portion that receives the pressure of the temperature sensitive medium in the diaphragm J251.

  As shown in FIG. 20, the diaphragm J251 is held by the inner peripheral edge J251b and the outer peripheral edge J251c being sandwiched between the holding parts 230 and 252b. The holding parts 230 and 252b form an enclosed space 252a for the temperature sensitive medium on one surface side of the diaphragm J251.

  Diaphragm J251 is mainly composed of rubber main body 30, and is integrated with barrier film 40 that prevents permeation of the temperature sensitive medium. The barrier film 40 is disposed inside the rubber body 30. The barrier film 40 is disposed over the entire area from the pressure receiving portion J251a of the diaphragm J251 to the inner peripheral edge portion J251b and the outer peripheral edge portion J251c. Thereby, permeation | transmission of the temperature sensitive medium with respect to the diaphragm J251 in the direction shown by the white arrow, ie, the direction D1 perpendicular | vertical to the surface of the diaphragm J251, can be prevented.

  The diaphragm J251 has a shape in which an inner peripheral edge portion J251b and an outer peripheral edge portion J251c protrude toward the enclosed space 252a of the temperature sensitive medium from the pressure receiving portion J251a. For this reason, in the diaphragm J251, the thickness T1 at the inner peripheral edge portion J251b and the outer peripheral edge portion J251c is thicker than the thickness T2 at the pressure receiving portion J251a. The inner peripheral edge J251b and the outer peripheral edge J251c are sandwiched and compressed by the holding parts 252b and 230, so that the unevenness on the surfaces of the holding parts 252b and 230 is filled with the rubber body 30. Thereby, leakage of the temperature sensitive medium from the gap between the holding portions 252b and 230 and the diaphragm J251 can be prevented.

  However, in this examination example, as shown in FIG. 21, the rubber body in which the temperature-sensitive medium easily passes through the inner peripheral edge portion J251b and the outer peripheral edge portion J251c above the barrier film 40 in the drawing, that is, toward the enclosed space 252a. There is a single rubber part J30a composed of only 30.

  Specifically, the diaphragm J251 has a protruding portion J251p that is formed on the enclosed space side of the inner peripheral edge portion J251b and the outer peripheral edge portion J251c and protrudes from the enclosed space side surface of the pressure receiving portion J251a. The protrusion J251p is composed only of the rubber main body 30, and the entire protrusion J251p is the rubber single part J30a described above.

  In other words, the diaphragm J251 is, as the rubber body 30, a first rubber layer 31 located on the side of the enclosed space 252a of the barrier film 40 and a second side located on the lower side of the barrier film 40 in the drawing, that is, on the side opposite to the enclosed space. And a rubber layer 32. The first rubber layer 31 of the inner peripheral edge portion J251b and the outer peripheral edge portion J251c is the rubber single portion J30a described above. In the inner peripheral edge portion J251b and the outer peripheral edge portion J251c, the thickness T3 of the first rubber layer 31 is thicker than the thickness T5 of the second rubber layer 32. Therefore, it can be said that the diaphragm J251 is provided with the barrier film 40 at a position on the anti-encapsulation space side in the rubber body 30 constituting the inner peripheral edge portion J251b and the outer peripheral edge portion J251c. The first rubber layer 31 has a thickness T3 at the inner peripheral edge portion J251b and an outer peripheral edge portion J251c that is greater than a thickness T4 at the pressure receiving portion J251a. The second rubber layer 32 has the same thickness T5 at the inner peripheral edge portion J251b and the outer peripheral edge portion J251c as the thickness T6 at the pressure receiving portion J251a. Each thickness is a thickness in a direction D1 perpendicular to the surface of the diaphragm J251.

  For this reason, the temperature-sensitive medium passes through the rubber single part J30a of the diaphragm J251 in the direction indicated by the white arrow in FIG. 21, that is, the direction D2 parallel to the surface of the diaphragm J251.

  In particular, in the examination example, the diaphragm J251 is annular, and the edges held by the holding portions 230 and 252b are both on the inner peripheral side and the outer peripheral side, so the edges held by the holding portions 230 and 252b are the outer periphery. Compared to the case where only the side exists, there are more rubber single parts J30a. For this reason, the amount of permeation of the temperature-sensitive medium increases in the study example so that it cannot be ignored, and the passage forming member cannot be displaced after a long time has occurred.

  This problem becomes more prominent as the ejector is made smaller. When the entire body is reduced, the pressure receiving portion of the diaphragm can be reduced in the same manner, but the inner peripheral edge and the outer peripheral edge of the diaphragm cannot be reduced as much as the pressure receiving portion for reasons such as securing a seal between the diaphragm and the holding portion. . For this reason, the ratio of the inner periphery part and the outer periphery part with respect to a pressure receiving part increases, and permeation | transmission of the temperature sensitive medium in an inner periphery part and an outer periphery part cannot be disregarded.

  In addition, such a problem is not limited to the shape of the diaphragm in the shape of the examination example, but when the inner peripheral edge portion and the outer peripheral edge portion protrude to the anti-encapsulation space side, or the entire diaphragm has a uniform thickness. Even in this case, if there is a single rubber portion on the enclosed space side of the inner peripheral edge and the outer peripheral edge, the same occurs.

  An object of the present invention is to provide an ejector capable of suppressing permeation of a temperature sensitive medium at an inner peripheral edge and an outer peripheral edge of a diaphragm.

The present invention is directed to an ejector applied to a vapor compression refrigeration cycle (10). And in order to achieve the said objective, in invention of Claim 1,
A swirling space (221) for swirling the refrigerant flowing in from the refrigerant inlet (211), a decompression space (222) for depressurizing the refrigerant flowing out of the swirling space, and a refrigerant flowing from the outside in communication with the refrigerant flow downstream of the decompression space The body (200) is formed with the suction passage (231) for sucking air and the pressure increase space (232) for increasing the pressure by mixing the refrigerant injected from the decompression space and the suction refrigerant sucked from the suction passage )When,
A passage forming member (240) that is at least partially disposed in the decompression space and the boosting space, and has a shape in which a cross-sectional area increases as the distance from the decompression space increases;
An annular diaphragm (251) disposed inside the body so as to surround the axis of the passage forming member and connected to the passage forming member;
The refrigerant passage formed between the inner peripheral surface of the part of the body that forms the decompression space and the outer peripheral surface of the passage forming member is a nozzle passage that functions as a nozzle that decompresses and injects the refrigerant flowing out of the swirling space. (224),
A refrigerant passage formed between an inner peripheral surface of a part of the body that forms a pressure increasing space and an outer peripheral surface of the passage forming member is a diffuser passage that functions as a diffuser for increasing the pressure by mixing the injected refrigerant and the suction refrigerant ( 232a),
The body holds the inner peripheral edge portion (251b) and the outer peripheral edge portion (251c) of the diaphragm, and holds the holding portions (230, 252b) that form an enclosed space (252a) that encloses the temperature sensitive medium on one surface side of the diaphragm. )
In the enclosed space of the holding part, the temperature sensitive medium is enclosed so that the temperature of the suction refrigerant flowing through the suction passage is transmitted to the temperature sensitive medium,
The temperature-sensitive medium is one whose pressure changes according to the temperature of the suction refrigerant,
The diaphragm is designed to move according to the pressure of the temperature sensitive medium.
The diaphragm includes a rubber body (30) made of a rubber material, and a barrier film (40, 60, 70) that is integrated with the rubber body and has a lower temperature-sensitive medium permeability than the rubber body. And
The inner peripheral edge and the outer peripheral edge are characterized in that a barrier film (40, 60, 70) is disposed at least at a position on the sealed space side of the rubber main body constituting them.

  According to this, since the barrier film is provided at least at the position on the sealed space side of the rubber main body constituting the inner peripheral edge portion and the outer peripheral edge portion, the anti-encapsulation of the rubber main body constituting the inner peripheral edge portion and the outer peripheral edge portion. Compared to the case where a barrier film is provided at the position on the space side, the permeation area when the temperature sensitive medium permeates in the direction parallel to the surface of the diaphragm through the inner peripheral edge and the outer peripheral edge can be reduced, Transmission of the temperature sensitive medium at the inner peripheral edge and the outer peripheral edge can be suppressed.

Further, in the invention described in claim 2, in the invention described in claim 1, the inner peripheral edge and the outer peripheral edge protrude from the pressure receiving part (251a) receiving the pressure of the temperature-sensitive medium toward the enclosed space. Part (251p, 251p1)
A barrier film (40, 60, 70) is provided inside or on the surface of the rubber main body constituting the protruding portion.

  According to this, since the barrier film is provided inside or on the surface of the protruding portion, the inside of the inner peripheral edge portion and the outer peripheral edge portion are compared with the surface of the diaphragm as compared with the case where the protruding portion is constituted only by the rubber body. The permeation area when the temperature sensitive medium permeates in a direction parallel to the surface can be reduced, and the permeation of the temperature sensitive medium at the inner peripheral edge and the outer peripheral edge can be suppressed.

In order to achieve the above object, the invention according to claim 8 provides:
A swirling space (221) for swirling the refrigerant flowing in from the refrigerant inlet (211), a decompression space (222) for depressurizing the refrigerant flowing out of the swirling space, and a refrigerant flowing from the outside in communication with the refrigerant flow downstream of the decompression space The body (200) is formed with the suction passage (231) for sucking air and the pressure increase space (232) for increasing the pressure by mixing the refrigerant injected from the decompression space and the suction refrigerant sucked from the suction passage )When,
A passage forming member (240) that is at least partially disposed in the decompression space and the boosting space, and has a shape in which a cross-sectional area increases as the distance from the decompression space increases;
An annular diaphragm (251) disposed inside the body so as to surround the axis of the passage forming member and connected to the passage forming member;
The refrigerant passage formed between the inner peripheral surface of the part of the body that forms the decompression space and the outer peripheral surface of the passage forming member is a nozzle passage that functions as a nozzle that decompresses and injects the refrigerant flowing out of the swirling space. (224),
A refrigerant passage formed between an inner peripheral surface of a part of the body that forms a pressure increasing space and an outer peripheral surface of the passage forming member is a diffuser passage that functions as a diffuser for increasing the pressure by mixing the injected refrigerant and the suction refrigerant ( 232a),
The body holds the inner peripheral edge portion (251b) and the outer peripheral edge portion (251c) of the diaphragm, and holds the holding portions (230, 252b) that form an enclosed space (252a) that encloses the temperature sensitive medium on one surface side of the diaphragm. )
In the enclosed space of the holding part, the temperature sensitive medium is enclosed so that the temperature of the suction refrigerant flowing through the suction passage is transmitted to the temperature sensitive medium,
The temperature-sensitive medium is one whose pressure changes according to the temperature of the suction refrigerant,
The diaphragm is designed to move according to the pressure of the temperature sensitive medium.
The diaphragm includes a rubber body (30) made of a rubber material, and a barrier film (40) that is integrated with the rubber body and has a lower temperature-sensitive medium permeability than the rubber body.
The barrier film is continuous from the pressure receiving part (251a) that receives the pressure of the temperature-sensitive medium from the inner peripheral edge and the outer peripheral edge, and has a shape that extends along the surface of the pressure receiving part.
The inner peripheral edge and the outer peripheral edge are formed of a barrier film, a first rubber layer (31) closer to the enclosed space than the barrier film in the rubber body, and a second rubber closer to the anti-encapsulated space than the barrier film in the rubber body. A layer (32),
The thickness (T3) of the first rubber layer in the direction perpendicular to the surface of the diaphragm is smaller than the thickness (T5) of the second rubber layer in the direction perpendicular to the surface of the diaphragm.

  When the thickness of the inner peripheral edge and the outer peripheral edge and the thickness of the barrier film in the direction perpendicular to the surface of the diaphragm are the same as those of the present invention, and the thickness of the first rubber layer is larger than the thickness of the second rubber layer And the present invention, the thickness of the first rubber layer is smaller in the present invention.

  Therefore, according to the eighth aspect of the invention, the permeation area through which the temperature-sensitive medium permeates through the inner peripheral edge and the outer peripheral edge in a direction parallel to the surface of the diaphragm can be reduced. The permeation of the temperature-sensitive medium at can be suppressed.

  In addition, the code | symbol in the bracket | parenthesis of each means described in this column and the claim is an example which shows a corresponding relationship with the specific means as described in embodiment mentioned later.

It is a schematic structure figure showing the whole refrigeration cycle composition concerning a 1st embodiment. It is a perspective view which shows the external appearance of the ejector which concerns on 1st Embodiment. It is a top view of the ejector which concerns on 1st Embodiment. It is IV-IV sectional drawing of FIG. It is a disassembled perspective view of the drive means which concerns on 1st Embodiment. It is an enlarged view of the VI section of FIG. It is typical sectional drawing for demonstrating the function of each refrigerant | coolant flow path of the ejector which concerns on 1st Embodiment. It is VIII-VIII sectional drawing of FIG. It is IX-IX sectional drawing of FIG. It is an enlarged view of the X section of FIG. It is principal part sectional drawing of the diaphragm before the compression which concerns on 2nd Embodiment. It is principal part sectional drawing of the diaphragm after the compression which concerns on 2nd Embodiment. 6 is a cross-sectional view of a main part of a compressed diaphragm according to Comparative Example 1. FIG. It is principal part sectional drawing of the diaphragm which concerns on 3rd Embodiment. It is principal part sectional drawing of the diaphragm which concerns on 4th Embodiment. It is principal part sectional drawing of the diaphragm which concerns on 5th Embodiment. It is principal part sectional drawing of the diaphragm which concerns on 6th Embodiment. It is principal part sectional drawing of the diaphragm which concerns on 7th Embodiment. It is a top view of the diaphragm which concerns on the example of examination. It is sectional drawing which shows the holding structure of the diaphragm in the XX-XX cross section of FIG. It is an enlarged view of the XXI-XXI part of FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other will be described with the same reference numerals.

(First embodiment)
In the present embodiment, the ejector 100 according to the present invention is applied to a vapor compression refrigeration cycle 10 constituting a vehicle air conditioner.

  First, the overall configuration and operation of the refrigeration cycle 10 of the present embodiment will be described.

  As shown in FIG. 1, the refrigeration cycle 10 is formed by connecting a compressor 11, a condenser 12, an ejector 100, and an evaporator 13 through a refrigerant pipe.

  The compressor 11 is a fluid machine that draws in refrigerant and compresses and discharges the drawn refrigerant. The compressor 11 of this embodiment is rotationally driven by a vehicle running engine via an electromagnetic clutch and a belt (not shown). The compressor 11 is composed of a variable displacement compressor whose discharge capacity is changed by inputting a control signal from a control device (not shown) to an electromagnetic displacement control valve, for example. The compressor 11 may be constituted by an electric compressor that is rotationally driven by an electric motor. In the case of an electric compressor, the discharge capacity is varied depending on the rotation speed of the electric motor.

  The condenser 12 releases heat of the high-pressure refrigerant to the outside air by exchanging heat of the high-pressure refrigerant discharged from the compressor 11 with vehicle exterior air (outside air) forcedly blown by a cooling fan (not shown). The refrigerant is condensed and liquefied.

  Here, in this embodiment, a so-called subcool type condenser is employed. That is, the condenser 12 according to the present embodiment includes a condensing unit 12a that condenses high-pressure refrigerant by exchanging heat with outside air, a receiver 12b that separates the gas-liquid refrigerant flowing out from the condensing unit 12a and stores excess liquid-phase refrigerant, and a receiver. The liquid-phase refrigerant that has flowed out of 12b is configured to have a supercooling portion 12c that performs heat exchange with the outside air to supercool. In addition, when the pressure of the refrigerant | coolant compressed by the compressor 11 exceeds a critical pressure, since a refrigerant | coolant does not become a condensate liquid in the condenser 12, the condenser 12 functions as a heat radiator which discharge | releases the heat | fever of a high pressure refrigerant | coolant to external air. To do. The refrigerant outflow side of the condenser 12 is connected to the refrigerant inlet 211 of the ejector 100.

  The ejector 100 constitutes a decompression unit that decompresses the high-pressure refrigerant in the liquid phase that has flowed out of the condenser 12, and is used for fluid transportation that circulates the refrigerant by suction action (entrainment action) of the refrigerant flow ejected at high speed. It constitutes a refrigerant circulation means. The specific configuration of the ejector 100 will be described later.

  The evaporator 13 is a heat exchanger that absorbs heat from outside air introduced into the air conditioning case of the air conditioner or air in the vehicle interior (inside air) by a blower (not shown), and evaporates the refrigerant flowing through the inside. The refrigerant outflow side of the evaporator 13 is connected to the refrigerant suction port 212 of the ejector 100.

  A control device (not shown) includes a well-known microcomputer including a CPU, various memories, and its peripheral circuits. This control device receives various operation signals from the operation panel by the occupant, detection signals from various sensor groups, etc., and executes various calculations and processing based on the control program stored in the memory using these input signals. And control the operation of various devices.

  In the refrigeration cycle 10 of the present embodiment, an HFC-type refrigerant, for example, R134a is adopted as the refrigerant, and a subcritical refrigeration cycle in which the high-pressure side refrigerant pressure does not exceed the refrigerant critical pressure is configured. Of course, as long as the refrigerant constitutes the subcritical refrigeration cycle, an HFO refrigerant such as R1234yf may be adopted.

  Next, a specific configuration of the ejector 100 according to the present embodiment will be described with reference to FIGS. 2 and 4 indicate the top and bottom directions when the ejector 100 is mounted on the vehicle. Moreover, the dashed-dotted line X in FIG. 4 has shown the axis of the channel | path formation member 240 mentioned later.

  The ejector 100 of this embodiment includes a body 200, a passage forming member 240, and a driving unit 250 that displaces the passage forming member 240 as main components.

  As shown in FIGS. 2 and 3, the ejector 100 of this embodiment includes a body 200 configured by combining a plurality of constituent members. This body 200 has a metal housing body 210 having a shape in which a columnar member extending vertically and a prismatic member in the radial direction of the member are combined, and a nozzle body 220 and a diffuser body 230 are contained therein. Etc. are fixed. The outer shape of the housing body 210 may be simply formed in a cylindrical shape or a prismatic shape. The housing body 210 may be made of resin or the like in order to reduce the weight.

  The housing body 210 is a member that forms the outer shell of the ejector 100. On the outside of the housing body 210, a refrigerant inlet 211 and a refrigerant suction port 212 are formed on the upper end side, and a liquid phase outlet 213 and a gas phase outlet 214 are formed on the lower end side. The refrigerant inlet 211 allows high-pressure refrigerant to flow from the high-pressure side (condenser 12) of the refrigeration cycle 10, and the refrigerant suction port 212 sucks low-pressure refrigerant flowing out of the evaporator 13. The liquid phase outlet 213 allows the liquid phase refrigerant separated in the gas-liquid separation space 260 described later to flow out to the refrigerant inlet side of the evaporator 13, and the gas phase outlet 214 is a gas-liquid separation space. The gas-phase refrigerant separated at 260 flows out to the suction side of the compressor 11.

  As shown in FIG. 4, the nozzle body 220 is accommodated on the upper end side in the housing body 210. More specifically, the nozzle body 220 partially overlaps with the refrigerant inlet 211 when viewed from a direction orthogonal to the direction (vertical direction) of the axis X of the passage forming member 240 described later. As described above, the housing body 210 is accommodated. The nozzle body 220 is fixed to the inside of the housing body 210 by means such as press-fitting with a seal member such as an O-ring interposed.

  The nozzle body 220 of the present embodiment is formed of an annular metal member, and is provided on the lower end side of the body part 220a and the body part 220a formed in a size that fits the inner space of the housing body 210. And a cylindrical nozzle portion 220b that protrudes.

  The body 220a of the nozzle body 220 is formed with a swirling space 221 and the like for swirling the high-pressure refrigerant flowing from the refrigerant inlet 211. The nozzle portion 220b of the nozzle body 220 is formed with a decompression space 222 through which the refrigerant swirling the swirling space 221 passes.

  The swirling space 221 is a space formed in a rotating body shape whose central axis extends in the vertical direction (vertical direction). The rotating body shape is a three-dimensional shape formed when a plane figure is rotated around one straight line (center axis) on the same plane. More specifically, the swirl space 221 of the present embodiment is formed in a substantially cylindrical shape. Of course, the swirl space 221 may be formed in a shape or the like in which a cone or a truncated cone and a cylinder are combined.

  Further, the swirling space 221 of the present embodiment is connected to the refrigerant inlet 211 through the refrigerant inflow passage 223 formed in the body 220a of the housing body 210 and the nozzle body 220.

  The refrigerant inflow passage 223 is formed to extend in the tangential direction of the inner wall surface of the swirling space 221 when viewed from the central axis direction of the swirling space 221. Thereby, the refrigerant that has flowed into the swirl space 221 from the refrigerant inflow passage 223 flows along the inner wall surface of the swirl space 221 and swirls in the swirl space 221. Note that the refrigerant inflow passage 223 does not need to be formed so as to completely coincide with the tangential direction of the swirl space 221 when viewed from the central axis direction of the swirl space 221. That is, if the refrigerant inflow passage 223 is formed in a shape in which the refrigerant that has flowed into the swirl space 221 flows along the inner wall surface of the swirl space 221, the component in the other direction (for example, the central axis direction of the swirl space 221). It may be comprised including.

  Here, since centrifugal force acts on the refrigerant swirling in the swirling space 221, the refrigerant pressure on the central axis side is lower than the refrigerant pressure on the outer peripheral side in the swirling space 221. Therefore, in the present embodiment, when the refrigeration cycle 10 is operated, the refrigerant pressure on the central axis side in the swirling space 221 is reduced to a pressure that becomes a saturated liquid phase refrigerant or a pressure at which the refrigerant boils under reduced pressure (causes cavitation). I try to let them.

  Such adjustment of the refrigerant pressure on the central axis side of the swirling space 221 can be realized by adjusting the swirling flow velocity of the refrigerant swirling in the swirling space 221. Specifically, the swirl flow velocity can be adjusted by adjusting the ratio between the cross-sectional area of the refrigerant inflow passage 223 and the cross-sectional area of the swirl space 221 in the direction orthogonal to the central axis. Note that the above-described swirling flow velocity means the flow velocity in the swirling direction of the refrigerant in the vicinity of the outermost peripheral portion of the swirling space 221.

  The decompression space 222 is formed on the lower side of the swirl space 221 so that the high-pressure refrigerant swirled in the swirl space 221 flows. The decompression space 222 of the present embodiment is formed so that its central axis is coaxial with the swirling space 221.

  The decompression space 222 has a truncated cone-shaped hole (a tapered portion 222a) in which the channel cross-sectional area continuously decreases toward the lower side (downstream in the refrigerant flow direction) and the channel cross-sectional area toward the lower side. It is formed in a shape in which a frustoconical hole (a divergent portion 222b) that continuously increases is combined. In addition, the connecting portion between the tapered portion 222a and the divergent portion 222b in the decompression space 222 is a nozzle throat portion (minimum passage area portion) 222c in which the flow path cross-sectional area is reduced most.

  In the divergent section 222b, when viewed from the radial direction of the central axis of the decompression space 222, the decompression space 222 and the upper side of the passage forming member 240 described later are overlapped (overlapped). The vertical cross-sectional shape is an annular shape (doughnut shape).

  In the present embodiment, a refrigerant passage formed between the inner peripheral surface of the portion of the nozzle body 220 that forms the decompression space 222 and the outer peripheral surface on the upper side of the passage forming member 240 described later as the nozzle is formed as a nozzle. A functioning nozzle passage 224 is formed.

  Subsequently, the diffuser body 230 is accommodated on the lower side of the nozzle body 220 inside the housing body 210. More specifically, the diffuser body 230 is formed so that a part thereof overlaps (overlaps) with the refrigerant suction port 212 when viewed from a direction orthogonal to the axial direction (vertical direction) of the housing body 210. Housed in the body 210. The diffuser body 230 is fixed to the inside of the housing body 210 by means such as press fitting with a seal member such as an O-ring interposed.

  The diffuser body 230 of the present embodiment is formed with a rotating body-shaped through hole 230a penetrating the front and back at the center thereof, and a groove 230b for accommodating a driving means described later on the outer peripheral side of the through hole 230a. It is comprised with the formed cyclic | annular metal member. The through hole 230 a is formed so that the central axis thereof is coaxial with the swivel space 221 and the decompression space 222.

  Between the upper surface of the diffuser body 230 and the lower surface of the nozzle body 220 facing the diffuser body 230, a suction space 231a for retaining the refrigerant flowing in from the refrigerant suction port 212 is formed. In the present embodiment, since the lower end portion of the nozzle body 220 is positioned inside the through hole 230a of the diffuser body 230, the suction space 231a is in the direction of the central axis of the swirl space 221 and the decompression space 222. When viewed from the above, the cross section is formed in an annular shape.

  In the range where the lower side of the nozzle body 220 is inserted in the through hole 230a of the diffuser body 230, that is, in the range where the diffuser body 230 and the nozzle body 220 overlap when viewed from the radial direction, the refrigerant passage cross-sectional area is the refrigerant. It gradually shrinks in the flow direction.

  As a result, a suction passage 231b is formed between the inner peripheral surface of the through hole 230a and the outer peripheral surface on the lower side of the nozzle body 220 so that the suction space 231a communicates with the downstream side of the refrigerant flow in the decompression space 222. That is, in the present embodiment, the suction space (suction passage) 231 through which the suction refrigerant flows from the outer peripheral side to the inner peripheral side of the central axis is formed by the suction space 231a and the suction passage 231b. Furthermore, the cross-sectional shape perpendicular to the central axis of the suction portion 231 is also annular.

  Further, in the through hole 230a of the diffuser body 230, on the downstream side of the refrigerant flow in the suction passage 231b, a pressure increasing space 232 that is formed in a substantially truncated cone shape that gradually expands in the refrigerant flow direction is formed. The pressurizing space 232 is a space in which the refrigerant injected from the nozzle passage 224 described above and the suction refrigerant sucked from the suction part 231 are mixed and pressurized.

  The pressurizing space 232 of the present embodiment is formed so that its radial cross-sectional area increases toward the downstream (downward side) in the refrigerant flow direction. Note that the pressurizing space 232 constitutes a frustoconical (trumpet) space whose cross-sectional area increases toward the lower side.

  Inside the pressurizing space 232, a lower side of a passage forming member 240 described later is disposed. The spread angle of the conical side surface of the passage forming member 240 in the boosting space 232 is smaller than the spread angle of the frustoconical space of the boosting space 232. As a result, the refrigerant passage formed between the inner peripheral surface of the pressurizing space 232 and the outer peripheral surface of the passage forming member 240 described later has its refrigerant passage area gradually expanded toward the downstream side of the refrigerant flow. Yes.

  In the present embodiment, the refrigerant passage formed between the inner peripheral surface of the pressurizing space 232 and the outer peripheral surface of the passage forming member 240 is a diffuser passage 232a that functions as a diffuser, and the velocity energy of the injected refrigerant and the sucked refrigerant is set as the speed energy. It is converted into pressure energy. The cross-sectional shape perpendicular to the central axis of the diffuser passage 232a is formed in an annular shape.

  Subsequently, the passage forming member 240 is a member that forms the nozzle passage 224 between the inner peripheral surface of the nozzle body 220 and the diffuser passage 232 a between the inner peripheral surface of the diffuser body 230. The passage forming member 240 of the present embodiment is made of a substantially conical metal member, and is accommodated in the housing body 210 so that at least a part thereof is located in both the pressure reducing space 222 and the pressure increasing space 232. Has been. The passage forming member 240 is arranged such that the central axis (axis X) is coaxial with the decompression space 222 and the pressurization space 232.

  A portion of the passage forming member 240 that faces the inner peripheral surface of the decompression space 222 forms a divergent portion of the decompression space 222 such that an annular nozzle passage 224 is formed between the inner peripheral surface of the decompression space 222. It has a curved surface along the inner peripheral surface of 222b.

  Further, the portion of the passage forming member 240 that faces the inner peripheral surface of the boosting space 232 has an annular diffuser passage 232 a formed between the inner peripheral surface of the boosting space 232 and the boosting space 232. It has a curved surface along the inner peripheral surface.

  Here, as described above, the boosting space 232 is formed so as to constitute a frustoconical space, and the passage forming member 240 has a curved surface along the inner peripheral surface of the boosting space 232. For this reason, the diffuser passage 232a is formed so as to extend in a direction intersecting the direction of the axis X (the central axis direction) of the passage forming member 240. That is, the diffuser passage 232a is a refrigerant passage that moves away from the axis X of the passage forming member 240 from the upstream side to the downstream side of the refrigerant flow. Thereby, the expansion of the dimension to the axial direction (direction of the axis X of a nozzle part) of the channel | path formation member 240 is suppressed, and it becomes possible to suppress the enlargement of the physique as the ejector 100 whole.

  Further, as shown in FIG. 7, the passage forming member 240 has a fixed blade 241 that applies a swirling force for gas-liquid separation to the refrigerant that has flowed out of the diffuser passage 232 a at a portion of the diffuser passage 232 a that is downstream of the refrigerant flow. Is arranged. The fixed wing 241 is disposed at a position where it does not interfere with a later-described operating rod 254a. For convenience, the illustration of the fixed wing 241 is omitted in the drawings other than FIG.

  Next, a driving unit 250 that changes the refrigerant flow area of the nozzle passage 224 and the diffuser passage 232a by displacing the passage forming member 240 in the direction of the axis X will be described with reference to FIGS.

  The drive means 250 is configured to control the amount of displacement of the passage forming member 240 so that the degree of superheat (temperature and pressure) of the low-pressure refrigerant flowing out of the evaporator 13 is in a desired range.

  As shown in FIG. 4, the drive means 250 of this embodiment is accommodated in the body 200 so as not to be affected by the external ambient temperature. The driving means 250 includes a thin-plate diaphragm 251 that is a pressure responsive member. The overall shape and holding structure of the diaphragm 251 of this embodiment are the same as the diaphragm J251 of the study example.

  As shown in FIGS. 4 and 5, the diaphragm 251 of the present embodiment is formed in an annular shape so as to be disposed in an annular groove 230 b formed in the diffuser body 230. The diaphragm 251 is disposed so as to surround the axis X of the passage forming member 240 so as not to interfere with the passage forming member 240. A specific configuration of the diaphragm 251 will be described later.

  As shown in FIG. 6, the diaphragm 251 of this embodiment has a pressure receiving portion 251a, an inner peripheral edge 251b, and an outer peripheral edge 251c, and both the inner peripheral edge 251b and the outer peripheral edge 251c are The diaphragm 251 is fixed to the diffuser body 230 by means such as caulking while being held between the inner wall surface of the groove 230b formed in the diffuser body 230 and the annular lid member 252b that closes the groove 230b. Yes.

  In other words, the diaphragm 251 is fixed so as to partition an annular space formed by the groove 230b of the diffuser body 230 and the lid member 252b into two upper and lower spaces. The upper space of the two spaces partitioned by the diaphragm 251 constitutes an enclosed space 252a in which a gaseous temperature sensitive medium whose pressure changes according to the temperature of the refrigerant flowing out of the evaporator 13 is enclosed. Yes.

  Therefore, the diffuser body 230 and the lid member 252b of the body 200 are holding parts that hold the diaphragm 251 and form an enclosed space 252a on one surface side of the diaphragm 251. Note that a temperature-sensitive medium (for example, R134a) mainly composed of the same refrigerant as the refrigerant circulating in the refrigeration cycle 10 is enclosed in the enclosed space 252a so as to have a predetermined density. The temperature sensitive medium may be, for example, a mixed gas of a refrigerant circulating in the cycle and helium gas.

  As shown in FIG. 4, the enclosed space 252 a of the present embodiment forms an annular space that conforms to the shape of the diaphragm 251, and the axis X of the passage forming member 240 does not interfere with the passage forming member 240. It is formed so as to surround it.

  More specifically, the enclosed space 252a of the present embodiment is disposed at a position adjacent to the suction portion 231 in the diffuser body 230 and surrounded by the suction portion 231 and the diffuser passage 232a. Thereby, the temperature of the suction refrigerant flowing through the suction part 231 is transmitted to the temperature-sensitive medium in the enclosed space 252a, and the internal pressure of the enclosed space 252a is set to a pressure corresponding to the temperature of the suction refrigerant flowing through the suction part 231. Become.

  On the other hand, of the two spaces partitioned by the diaphragm 251, the lower space constitutes an introduction space 253 for introducing the refrigerant flowing out of the evaporator 13 through the communication passage 230 c formed in the diffuser body 230. ing. The introduction space 253 is a pressure chamber that applies the pressure of the suction refrigerant in the suction portion (suction passage) 231 to the diaphragm 251 so as to counter the pressure of the temperature sensitive medium.

  Therefore, the temperature of the refrigerant flowing out of the evaporator 13, that is, the suction refrigerant flowing through the suction portion 231 is transmitted to the temperature-sensitive medium enclosed in the enclosed space 252 a through the lid member 252 b and the diaphragm 251.

  Here, in order to realize highly accurate superheat control by the driving means 250, it is important to bring the temperature of the temperature sensitive medium close to the temperature of the refrigerant flowing out of the evaporator 13 (to reduce the temperature difference). . The temperature-sensitive medium is a medium that changes in pressure as the temperature changes. However, the pressure of the temperature-sensitive medium is approximated to the saturation pressure at the lowest temperature of the temperature-sensitive medium.

  Therefore, in the present embodiment, in order to bring the temperature of the temperature-sensitive medium close to the temperature of the suction refrigerant in the suction space 231a, the temperature-sensitive cylinder 252c that protrudes from the lid member 252b toward the suction space 231a is provided on the lid member 252b. Arranged at the top. The enclosed space 252a, the lid member 252b, and the temperature sensing cylinder 252c constitute a temperature sensing unit 252 that detects the temperature of the suction refrigerant flowing through the suction unit 231. Note that the temperature sensing tube 252c may be omitted, and the temperature sensing part 252 may be configured only by the enclosed space 252a and the lid member 252b.

  In addition, the driving unit 250 according to the present embodiment includes a transmission member 254 that transmits the displacement of the diaphragm 251 to the passage forming member 240. The diaphragm 251 is connected to the passage forming member 240 through the transmission member 254.

  The transmission member 254 according to the present embodiment is in contact with both the plurality of columnar actuating rods 254a disposed so that one end thereof is in contact with the passage forming member 240, the other end of each actuating rod 254a, and the diaphragm 251. It has the plate member 254b arrange | positioned so that it may be comprised.

  The actuating rod 254a penetrates a through hole formed on the radially outer side of the through hole 230a of the diffuser body 230, one end side contacts the lower outer periphery of the passage forming member 240, and the other end side contacts the plate member 254b. It is arranged to do.

  It is desirable that the operating rods 254a be equally arranged in the circumferential direction of the diffuser body 230 so that the displacement of the diaphragm 251 is accurately transmitted to the passage forming member 240. Note that a gap formed between the operating rod 254a and the through hole into which the operating rod 254a in the diffuser body 230 is inserted is sealed with a seal member such as an O-ring. Thereby, when the operating rod 254a is displaced, the refrigerant is difficult to leak from the gap.

  Here, when the operating rod 254a is fixed to the passage forming member 240 and the plate member 254b by welding or the like, the shaft of the operating rod 254a forms the passage due to warpage of the diaphragm 251 or variation in pressure of the temperature sensitive medium. The member 240 is inclined with respect to the axis X. And if the axis | shaft of the action | operation rod 254a inclines with respect to the axis line X of the channel | path formation member 240, the channel | path formation member 240 may be displaced irrespective of the superheat degree (temperature and pressure) of the refrigerant | coolant which distribute | circulates the suction part 231. There is sex.

  Therefore, the actuating rod 254a of the present embodiment is configured such that both the part in contact with the plate member 254b and the part in contact with the passage forming member 240 can change the contact positions and contact angles with respect to the members 240 and 254b. Yes.

  Specifically, the actuating rod 254a has a curved surface shape so that both the portion that contacts the plate member 254b and the portion that contacts the passage forming member 240 can change the contact position and the contact angle with respect to each member 240 and 254b. (In this embodiment, a hemispherical shape).

  Thereby, it can suppress that the axis | shaft of the action | operation rod 254a inclines with respect to the axial direction of the channel | path formation member 240 resulting from the curvature of the diaphragm 251, the dispersion | variation in the pressure of a temperature sensitive medium, etc. In addition, the part which contacts each member 240,254b in the operating rod 254a is not restricted to hemispherical shape, It is good also as curved surface shapes, such as R shape. In addition, the operating rod 254a may be configured such that only a portion that contacts one of the members 240 and 254b can change a contact position and a contact angle with respect to the members 240 and 254b.

  The plate member 254b is a member that connects the diaphragm 251 and the operating rod 254a, and is disposed adjacent to the diaphragm 251 so as to support an intermediate portion between the outer peripheral edge portion and the inner peripheral edge portion of the diaphragm 251. . In addition, the plate member 254b of this embodiment is arrange | positioned so that the surface by the side of the introduction space 253 in the diaphragm 251 may be supported.

  The plate member 254b of this embodiment is formed in an annular shape so as to overlap with the diaphragm 251 when viewed from the axial direction of the passage forming member 240 in order to appropriately transmit the displacement of the diaphragm 251 to the operating rod 254a.

  Further, the plate member 254b of the present embodiment is made of a metal material so as to have higher rigidity than the diaphragm 251. By interposing the plate member 254b between the diaphragm 251 and the actuating rod 254a, the plate 254b is transmitted from the diaphragm 251 to the passage forming member 240 due to variations in dimensions of the actuating rods 254a, warpage of the diaphragm 251 and the like. It can control that force changes.

  The drive unit 250 includes a coil spring 255 that applies a load to the passage forming member 240 and a load adjustment member 256 that adjusts the load of the coil spring 255 acting on the passage forming member 240.

  The coil spring 255 applies a load to the side of the nozzle passage 224 and the diffuser passage 232a that reduces the refrigerant passage area with respect to the bottom surface of the passage formation member 240. The coil spring 255 functions as a buffer member that attenuates vibration of the passage forming member 240 caused by pressure pulsation when the refrigerant is depressurized.

  The load adjusting member 256 includes an adjusting rod 256a connected to the coil spring 255 and an adjusting screw 256b that displaces the adjusting rod 256a up and down. The load adjusting member 256 functions as means for adjusting the valve opening pressure of the passage forming member 240 by adjusting the load applied to the passage forming member 240 by the coil spring 255 to finely adjust the target degree of superheat. .

  In the driving means 250 configured in this manner, the diaphragm 251 displaces the passage forming member 240 according to the temperature and pressure of the refrigerant flowing out of the evaporator 13, so that the degree of superheat of the refrigerant on the outlet side of the evaporator 13 is increased. Adjustment is made so as to approach a predetermined value.

  For example, when the temperature and pressure of the refrigerant flowing out of the evaporator 13 are high and the load of the refrigeration cycle 10 is high, the diaphragm 251 causes the passage forming member 240 to increase the refrigerant passage area of the nozzle passage 224 and the diffuser passage 232a. Displace. Thereby, the refrigerant | coolant flow volume which circulates the inside of the refrigerating cycle 10 increases.

  On the other hand, when the temperature and pressure of the refrigerant flowing out of the evaporator 13 are low and the load of the refrigeration cycle 10 is low, the diaphragm 251 causes the passage forming member 240 to reduce the refrigerant passage areas of the nozzle passage 224 and the diffuser passage 232a. Displace. As a result, the flow rate of the refrigerant circulating in the refrigeration cycle 10 decreases.

  In the present embodiment, the diaphragm 251 and the temperature sensing part 252 of the driving unit 250 are formed in an annular shape so as to surround the axis X of the passage forming member 240. According to this, since the area which receives the pressure of the refrigerant in the diaphragm 251 can be sufficiently secured, the nozzle passage 224 and the diffuser passage 232a can be appropriately changed according to the pressure change of the refrigerant flowing through the suction portion 231. . As a result, it becomes possible to flow the refrigerant flow rate according to the load of the refrigeration cycle 10, and the operation of the ejector 100 corresponding to the load of the refrigeration cycle 10 can be drawn.

  Further, the diaphragm 251 and the temperature sensing part 252 of the driving means 250 are formed in an annular shape so as to surround the axis X of the passage forming member 240, so that an internal space that does not interfere with the passage forming member 240 in the body 200 is provided as the driving means. Thus, the space 250 can be effectively used. As a result, an increase in the size of the ejector 100 as a whole can be suppressed.

  Next, the configuration on the lower side of the passage forming member 240 in the ejector 100 will be described. A gas-liquid separation space 260 is formed between the passage forming member 240 and the bottom of the housing body 210 to separate the mixed refrigerant flowing out of the diffuser passage 232a. The gas-liquid separation space 260 is a substantially cylindrical space, and its central axis is coaxial with the central axes of the swirl space 221, the decompression space 222, and the pressurization space 232.

  In addition, a cylindrical pipe 261 that is coaxially disposed in the gas-liquid separation space 260 and extends toward the passage forming member 240 side (upper side) is provided on the bottom surface of the internal space of the housing body 210. Inside the pipe 261, a gas-phase-side outflow passage 262 that guides the gas-phase refrigerant separated in the gas-liquid separation space 260 to the gas-phase outlet 214 formed in the housing body 210 is formed.

  Further, the liquid phase refrigerant separated in the gas-liquid separation space 260 is stored on the outer peripheral side of the pipe 261. The space on the outer peripheral side of the pipe 261 in the housing body 210 constitutes a liquid storage space 270 that stores the liquid-phase refrigerant. Further, a liquid phase side outflow passage 271 that guides the liquid phase refrigerant stored in the liquid storage space 270 to the liquid phase outlet 213 is formed at a portion corresponding to the liquid storage space 270 in the housing body 210.

  Next, the operation of the present embodiment based on the above configuration will be described. When an air conditioning operation switch or the like is turned on by the occupant, the electromagnetic clutch of the compressor 11 is energized by a control signal from the control device, and the rotational driving force from the vehicle running engine is supplied to the compressor 11 via the electromagnetic clutch or the like. Communicated. Then, a control signal is input from the control device to the electromagnetic capacity control valve of the compressor 11, the discharge capacity of the compressor 11 is adjusted to a desired amount, and the compressor 11 is connected to the gas phase outlet 214 of the ejector 100. The gas-phase refrigerant sucked from is compressed and discharged.

  The high-temperature and high-pressure gas-phase refrigerant discharged from the compressor 11 flows into the condensing part 12a of the condenser 12 and is cooled by the outside air to be condensed and liquefied, and then the gas and liquid are separated by the receiver 12b. Thereafter, the liquid-phase refrigerant separated by the receiver 12b flows into the supercooling unit 12c and is supercooled.

  The liquid-phase refrigerant that has flowed out of the supercooling unit 12 c of the condenser 12 flows into the refrigerant inlet 211 of the ejector 100. The high-pressure refrigerant that has flowed into the refrigerant inlet 211 of the ejector 100 flows into the swirling space 221 inside the ejector 100 via the refrigerant inflow passage 223, as shown in FIG. Then, the high-pressure refrigerant that has flowed into the swirl space 221 flows along the inner wall surface of the swirl space 221 and becomes a swirl flow that swirls in the swirl space 221. Such a swirl flow reduces the pressure in the vicinity of the swirl center to a pressure at which the refrigerant boils under reduced pressure by the action of centrifugal force, so that the swirl center side is in a two-layer separated state with a gas single phase around it and a liquid single phase around it. Become.

  Then, the gas single-phase and liquid single-phase refrigerants swirling in the swirling space 221 flow into the decompression space 222 that is coaxial with the central axis of the swirling space 221 as refrigerant in a gas-liquid mixed phase, and in the nozzle passage 224. Inflated under reduced pressure. When the pressure energy of the refrigerant is converted into velocity energy during the decompression and expansion, the gas-liquid mixed phase refrigerant is ejected from the nozzle passage 224 at a high velocity.

  This point will be described in detail. The nozzle passage 224 is caused by boiling on the wall surface generated when the refrigerant is separated from the inner wall surface side of the tapered portion 222a of the nozzle portion 220b, and boiling nuclei generated by the cavitation of the refrigerant on the center side of the nozzle passage 224. Interfacial boiling promotes boiling of the refrigerant. Thereby, the refrigerant flowing into the nozzle passage 224 is in a gas-liquid mixed phase state in which the gas phase and the liquid phase are homogeneously mixed.

  Then, the refrigerant flowing in the gas-liquid mixed phase in the vicinity of the nozzle throat portion 222c of the nozzle portion 220b is blocked (choked), and the refrigerant in the gas-liquid mixed state that has reached the speed of sound by the choking is diverted from the nozzle portion 220b. It is accelerated and ejected by the part 222b.

  Thus, the energy conversion efficiency (corresponding to the nozzle efficiency) in the nozzle passage 224 can be improved by efficiently accelerating the refrigerant in the gas-liquid mixed state to the sound velocity by promoting the boiling by both the wall surface boiling and the interface boiling. Can do. Incidentally, the nozzle efficiency in the nozzle passage 224 is improved in proportion to the speed of the jetted refrigerant.

  In addition, since the nozzle passage 224 of the present embodiment is formed in a substantially annular shape that is coaxial with the swirl space 221, the nozzle passage 224 has the passage forming member 240 of the passage forming member 240 as shown by a thick solid arrow in FIG. Flow around the surroundings.

  Further, the refrigerant flowing out of the evaporator 13 is sucked into the suction portion 231 through the refrigerant suction port 212 by the suction action of the refrigerant ejected from the nozzle passage 224. Then, the mixed refrigerant of the low-pressure refrigerant sucked by the suction portion 231 and the jet refrigerant jetted from the nozzle passage 224 flows into the diffuser passage 232a whose refrigerant flow passage area is enlarged toward the downstream side of the refrigerant flow, and velocity energy Is converted into pressure energy to increase the pressure.

  As shown in FIG. 9, the diffuser passage 232a of the present embodiment has a cross section in a direction perpendicular to the central axis direction of the passage forming member 240 so that the refrigerant swirls in the same direction as the refrigerant swirling in the swirling space 221. The shape is formed in an annular shape. Thus, if the flow of the refrigerant in the diffuser passage 232a is a flow swirling around the central axis of the passage forming member 240, the flow path for increasing the pressure of the refrigerant can be formed in a spiral shape. Thereby, the length of the refrigerant passage for increasing the pressure of the refrigerant can be sufficiently secured without expanding the diffuser passage 232a in the axial direction of the passage forming member 240, so that the center of the passage forming member 240 of the ejector 100 can be secured. Expansion in the axial direction can be suppressed.

  Since the refrigerant that has flowed out of the diffuser passage 232a flows into the fixed blade 241 and is given a turning force, the gas-liquid of the refrigerant is separated inside the gas-liquid separation space 260 by the action of centrifugal force.

  The gas-phase refrigerant separated in the gas-liquid separation space 260 is sucked into the suction side of the compressor 11 through the gas-phase side outflow passage 262 and the gas-phase outlet 214 and is compressed again. At this time, since the pressure of the refrigerant sucked into the compressor 11 is increased in the diffuser passage 232a of the ejector 100, the driving force of the compressor 11 can be reduced.

  Further, the liquid phase refrigerant separated in the gas-liquid separation space 260 is stored in the liquid storage space 270, and is evaporated through the liquid phase side outflow passage 271 and the liquid phase outflow port 213 by the refrigerant suction action of the ejector 100. Flows into the vessel 13. In the evaporator 13, the low-pressure liquid refrigerant absorbs heat from the air flowing in the air conditioning case and evaporates. And the gaseous-phase refrigerant | coolant which flowed out from the evaporator 13 is attracted | sucked by the suction part 231 via the refrigerant | coolant suction port 212 of the ejector 100, and flows in into the diffuser channel | path 232a. At this time, as described above, the displacement of the passage forming member 240 is adjusted by the driving unit 250 so that the superheat degree of the gas-phase refrigerant flowing out of the evaporator 13 falls within a desired range.

  Next, a specific configuration of the diaphragm 251 will be described.

  As shown in FIG. 6, the diaphragm 251 needs to be deformed according to the pressure difference between the internal pressure of the enclosed space 252a and the pressure of the refrigerant introduced into the introduction space 253, and the temperature sensitive medium needs to be continuously enclosed in the enclosed space 252a. There is. Moreover, since the diaphragm 251 is always in contact with the refrigerant, it is necessary to ensure resistance to the pressure of the refrigerant. For this reason, it is desirable that the diaphragm 251 is made of a material excellent in elasticity, toughness, pressure resistance, gas barrier properties, and sealing properties.

  Therefore, as shown in FIG. 10, the diaphragm 251 of this embodiment includes a rubber body 30 that forms the outer shape of the diaphragm 251 and a barrier film 40 that prevents the transmission of the temperature-sensitive medium, as in the diaphragm J251 of the study example. It has an integrated configuration. 10 shows only the internal structure of the inner peripheral edge 251b of the diaphragm 251, the internal structure of the outer peripheral edge 251c is the same as that of the inner peripheral edge 251b. Further, arrow directions D1 and D2 in FIG. 10 indicate a direction perpendicular to the surface of the diaphragm 251 and a direction parallel to the surface of the diaphragm 251, respectively. A direction D1 perpendicular to the surface of the diaphragm 251 coincides with the direction of the axis X of the passage forming member 240.

  The rubber body 30 is made of a rubber material. Examples of the rubber material include synthetic rubbers such as EPDM (ethylene propylene rubber) and HNBR (hydrogenated nitrile rubber). The rubber body 30 has a base fabric 50 embedded therein. The base fabric 50 is configured as a fabric of synthetic resin fibers such as polyester. The barrier film 40 is formed by forming a barrier material having a lower temperature-sensitive medium permeability than the rubber main body 30 into a film shape thinner than the diaphragm 251. As such a barrier material, the same barrier material that constitutes the refrigerant impervious layer of the rubber hose used as the refrigerant pipe can be used. For example, EVOH (ethylene vinyl alcohol copolymer), PI (polyimide), Examples thereof include synthetic resins such as PVDC (polyvinylidene chloride), PA (polyamide), PET (polyethylene terephthalate), and PVA (polyvinyl alcohol). The barrier material preferably has a permeability of 1/1000 or less than that of the rubber main body 30. A barrier material having a low permeability of the temperature sensitive medium is appropriately selected and used according to the type of the temperature sensitive medium used.

  The diaphragm 251 of the present embodiment has a shape in which the inner peripheral edge portion 251b and the outer peripheral edge portion 251c protrude from the pressure receiving portion 251a on the surface of the temperature sensitive medium enclosed space 252a side, like the diaphragm J251 of the examination example. That is, the diaphragm 251 has a protruding portion 251p that is formed on the enclosed space 252a side of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c and protrudes from the surface of the pressure receiving portion 251a on the enclosed space 252a side. Further, the diaphragm 251 has a flat shape on the surface on the introduction space 253 side with no step between the inner peripheral edge portion 251b and the outer peripheral edge portion 251c and the pressure receiving portion 251. Therefore, in the diaphragm 251, the thickness T1 at the inner peripheral edge 251b and the outer peripheral edge 251c is thicker than the thickness T2 at the pressure receiving part 251a of the diaphragm 251 located therebetween.

  Then, as shown in FIG. 6, the inner peripheral edge portion 251b and the outer peripheral edge portion 251c of the diaphragm 251 are sandwiched and compressed by the diffuser body 230 and the lid member 252b as the holding portions, so that these holding portions 230 and 252b. Surface irregularities are filled with rubber material. Thereby, the leakage of the temperature sensitive medium from the gap between the diaphragm 251 and the surfaces of the holding portions 230 and 252b is prevented.

  As shown in FIG. 10, the barrier film 40 is disposed inside the rubber main body 30. Note that the enlarged sectional view of the diaphragm 251 in FIG. 10 shows a state before the diaphragm 251 is compressed by the holding portions 230 and 252a. In a state after the diaphragm 251 is compressed by the holding portions 230 and 252a, the thickness of the rubber main body 30 is reduced, but the relative position of the barrier film 40 inside the rubber main body 30 does not change.

  The barrier film 40 has a continuous shape from the pressure receiving portion 251a of the diaphragm 251 to the inner peripheral edge portion 251b and the outer peripheral edge portion 251c. The barrier film 40 has a uniform thickness over the entire range.

  In the pressure receiving portion 251a, the barrier film 40 has a shape extending along both surfaces of the diaphragm 251. Thereby, permeation of the temperature sensitive medium in the pressure receiving part 251a in the direction D1 perpendicular to the surface of the diaphragm 251 is prevented.

  On the other hand, in the inner peripheral edge 251b and the outer peripheral edge 251c, the barrier film 40 does not extend along the surface of the diaphragm 251 at the pressure receiving part 251a but is bent toward the enclosed space 252a. For this reason, the barrier film 40 is arranged closer to the enclosed space 252a than the center position in the direction D1 perpendicular to the surface of the diaphragm 251 in the inner peripheral edge 251b and the outer peripheral edge 251c.

  In the present embodiment, the barrier film 40 is continuous from the pressure receiving portion 251a to the inner peripheral edge portion 251b and the outer peripheral edge portion 251c, and extends parallel to both surfaces of the diaphragm 251 at the pressure receiving portion 251a, and the inner peripheral edge portion 251b. In the outer peripheral edge portion 251c, the barrier film 40 is bent toward the enclosed space 252a, and further bent to extend to the inner peripheral end surface and the outer peripheral end surface of the diaphragm 251. In the present embodiment, the barrier film 40 extends in parallel to both surfaces of the diaphragm 251 at the pressure receiving portion 251a, but may not be completely parallel.

  The rubber body 30 includes a first rubber layer 31 located on the enclosed space 252a side with respect to the barrier film 40 and a second rubber layer 32 on which the introduction space is located on the 253 side with respect to the barrier film 40. The second rubber layer 32 has an inner peripheral edge portion 251b and an outer peripheral edge portion 251c that protrude closer to the enclosed space 252a than the pressure receiving portion 251a, and a surface on the introduction space 253 side extends from the pressure receiving portion 251a to the inner peripheral edge portion 251b and the outer peripheral edge portion 251c. It is a flat shape. Therefore, in the second rubber layer 32, the thickness T5 at the inner peripheral edge 251b and the outer peripheral edge 251c is thicker than the thickness T6 at the pressure receiving part 251a. In the first rubber layer 31, the thickness T3 at the inner peripheral edge portion 251b and the outer peripheral edge portion 251c is the same as or close to the thickness T4 at the pressure receiving portion 251a. In the inner peripheral edge 251b and the outer peripheral edge 251c, the thickness T3 of the first rubber layer 31 is thinner than the thickness T5 of the second rubber layer 32.

  The diaphragm 251 having such a configuration is molded by preforming. For example, an upper mold and a lower side having the same cavity as the outer shape of the diaphragm 251 are prepared. Then, the second rubber layer 32 having the shape shown in FIG. 10 in a state where the base fabric 50 is built in the lower mold is molded in advance as a preform of unvulcanized rubber. Similarly, in the upper mold, the first rubber layer 31 is molded in advance as a preform of unvulcanized rubber. Thereafter, the upper mold and the lower mold are overlapped, and the barrier film 40 is sandwiched between the first rubber layer 31 and the second rubber layer 32, and these are integrated by thermal vulcanization. Thereby, the diaphragm 251 having the above-described configuration is molded.

  Here, the diaphragm 251 of the present embodiment and the diaphragm J251 of the study example described in the column of the problem to be solved by the present invention are compared.

  The diaphragm J251 of the examination example shown in FIG. 21 has the same outer shape as the diaphragm 251 of the present embodiment, but the arrangement of the barrier film 40 inside the rubber body 30 is different from that of the diaphragm 251 of the present embodiment. That is, the diaphragm J251 of the study example has a substantially flat shape in which the barrier film 40 inside the rubber body 30 has no step over the entire area from the pressure receiving portion J251 to the inner peripheral edge portion J251b and the outer peripheral edge portion J251c.

  For this reason, the barrier film 40 is located on the side opposite to the encapsulating space from the center position in the direction D1 perpendicular to the surface of the diaphragm 251 inside the inner peripheral edge J251b and the outer peripheral edge J251c. As a result, the thickness T3 of the single rubber part J30a made of only the rubber material existing on the sealed space 252a side of the barrier film 40 is increased. In other words, the entire protrusion J251p is the rubber single part J30a. In particular, in the examination example, since the inner peripheral edge J251b and the outer peripheral edge J251c have a shape protruding toward the enclosed space 252a, the rubber alone as compared with the case where the inner peripheral edge J251b and the outer peripheral edge J251c do not protrude. The thickness T3 of the part J30a is increased.

  In contrast, in the diaphragm 251 of the present embodiment, the barrier film 40 is bent toward the enclosed space 252a inside the inner peripheral edge 251b and the outer peripheral edge 251c. Thereby, the barrier film 40 is provided inside the rubber main body 30 constituting the protruding portion 251p. In other words, the barrier film 40 is provided at a position on the sealed space 252a side in the rubber body 30 constituting the inner peripheral edge 251b and the outer peripheral edge 251c.

  Therefore, when the present embodiment is compared with the study example with the same thicknesses of the inner peripheral edge and the outer peripheral edge and the thickness of the barrier film in the study example and the study example, it exists in the inner periphery and the outer periphery. The thickness T3 of the rubber single parts 30a and J30a to be made is thinner in this embodiment than in the examination example. Therefore, according to this embodiment, as compared with the examination example, the rubber single part 30a when the temperature-sensitive medium permeates in the direction D2 parallel to the surface of the diaphragm 251 through the inner peripheral edge 251b and the outer peripheral edge 251c. The transmission area can be reduced, and the permeation of the temperature-sensitive medium at the inner peripheral edge 251b and the outer peripheral edge 251c can be suppressed. In addition, the permeation | transmission area of the rubber single-piece | unit part 30a is a cross-sectional area of the rubber single-piece | unit part 30a orthogonal to the permeation | transmission direction of a temperature sensitive medium.

  In this embodiment, the end portion 41 of the barrier film 40 reaches the inner peripheral end surface and the outer peripheral end surface of the diaphragm 251. However, if the barrier film 40 exists inside the protruding portion 251p, the barrier film 40 The end portion 41 may be located inside the protruding portion 251p.

(Second Embodiment)
In the present embodiment, the structure of the diaphragm 251 is changed with respect to the first embodiment, and the configuration other than the diaphragm 251 is the same as that of the first embodiment.

  As shown in FIG. 11, in the diaphragm 251 of this embodiment, the inner peripheral edge 251b and the outer peripheral edge 251c are introduced to the sealed space 252a side from the pressure receiving part 251a before being compressed by the holding parts 252b and 230. The shape protrudes on both sides of the space 253 side (the anti-encapsulation space side). That is, the diaphragm 251 is formed on the enclosed space 252a side of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c, and protrudes from the surface of the pressure receiving portion 251a, and the inner peripheral edge portion 251b and the outer peripheral edge portion 251c. It has the 2nd protrusion part 251p2 which was formed in the introduction space 253 side and protruded from the surface of the pressure receiving part 251a. Thereby, the diaphragm 251 of this embodiment has a shape in which the thickness T1 of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c is thicker than the thickness T2 of the pressure receiving portion 251a. These thicknesses T1 and T2 are the same as those in the first embodiment. The protrusion height H1 of the first protrusion 251p1 is lower than the protrusion height H2 of the second protrusion 251p2.

  The barrier film 40 is disposed inside the rubber body 30. The barrier film 40 has a continuous shape from the pressure receiving portion 251a of the diaphragm 251 to the inner peripheral edge portion 251b and the outer peripheral edge portion 251c. The barrier film 40 has a uniform thickness over the entire range.

  In the pressure receiving portion 251a, the barrier film 40 has a shape extending along both surfaces of the diaphragm 251. On the other hand, at the inner peripheral edge portion 251b and the outer peripheral edge portion 251c, the barrier film 40 is closer to the enclosed space 252a side so as to approach the surface of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c on the enclosed space 252a side as the pressure receiving portion 251a is separated. It has a bent shape. And the edge part 41 of the barrier film 40 is located in the surface at the side of the enclosure space 252a of the inner peripheral edge part 251b and the outer peripheral edge part 251c. In addition, the surface of the inner peripheral edge 251b and the outer peripheral edge 251c on the side of the enclosed space 252a is a surface in contact with the lid member 252b that sandwiches the diaphragm 251 among the inner peripheral edge 251b and the outer peripheral edge 251c.

  Thereby, in this embodiment, the barrier film | membrane 40 is provided in the inside of the rubber main body 30 which comprises the 1st protrusion part 251p1. In other words, the barrier film 40 is provided at a position on the sealed space 252a side in the rubber body 30 constituting the inner peripheral edge 251b and the outer peripheral edge 251c. Therefore, also in this embodiment, there exists an effect similar to 1st Embodiment.

  Furthermore, in this embodiment, the 2nd protrusion part 251p2 is the 1st bending part 30b located in the pressure receiving part 251a side (left side in FIG. 11), and the 1st bending part 30b located in the counter pressure receiving part side (right side in FIG. 11). 2 curved portions 30c. The first bending portion 30b and the second bending portion 30c have a relationship that the curvature radius of the first bending portion 30b is larger than the curvature radius of the second bending portion 30c in a cross section perpendicular to the surface of the diaphragm 251. . That is, the first bending portion 30b is more gently bent than the second bending portion 30c.

  Here, when the curvature radii of the first bending portion 30b and the second bending portion 30c are different, when the inner peripheral edge portion 251b and the outer peripheral edge portion 251c of the diaphragm 251 are sandwiched and compressed by the holding portions 252b and 230, the curvature radius is increased. It deform | transforms so that the 2nd protrusion part 251p2 may extend to a small side.

  Therefore, as in Comparative Example 1 shown in FIG. 13, in contrast to the present embodiment, when the radius of curvature of the first curved portion 30b is smaller than the radius of curvature of the second curved portion 30c, the inner peripheral edge 251b and the outer When the peripheral edge portion 251c is compressed by being sandwiched between the holding portions 252b and 230, the second protruding portion 251p2 is deformed so as to extend toward the pressure receiving portion 251a (left side in FIG. 13). As a result, the barrier film 40 is separated from the lid member 252b.

  On the other hand, in the present embodiment, as shown in FIG. 12, when the inner peripheral edge 251b and the outer peripheral edge 251c are sandwiched and compressed by the holding parts 252b and 230, the second protrusion 251p2 is on the counter pressure receiving part side (see FIG. 12). 12 to the right). As a result, the barrier film 40 can be brought closer to the lid member 252b by the second projecting portion 251p2 extending toward the counter pressure receiving portion.

  At this time, in this embodiment, since the end 41 of the barrier film 40 is located on the surface of the inner peripheral edge 251b and the outer peripheral edge 251c on the side of the enclosed space 252a, the end 41 of the barrier film 40 is the lid member 252b. Will be in contact with the For this reason, in the inner peripheral edge 251b and the outer peripheral edge 251c, there is no single rubber part through which the temperature sensitive medium can pass in the direction D2 parallel to the surface of the diaphragm 251. Therefore, the inner peripheral edge 251b and the outer peripheral edge 251c The permeation of the temperature sensitive medium can be prevented.

(Third embodiment)
In the present embodiment, the structure of the diaphragm 251 is changed with respect to the first embodiment, and the configuration other than the diaphragm 251 is the same as that of the first embodiment.

  As shown in FIG. 14, the diaphragm 251 of this embodiment is the same in the shape of the barrier film 40, the 1st rubber layer 31, and the 2nd rubber layer 32 as the diaphragm J251 of an examination example. The diaphragm 251 has a shape in which the inner peripheral edge 251b and the outer peripheral edge 251c protrude from the pressure receiving part 251a on the surface on the sealed space 252a side. That is, the diaphragm 251 has a protruding portion 251p that is formed on the enclosed space 252a side of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c, and protrudes from the enclosed space 252a side surface of the pressure receiving portion 251a. Further, the diaphragm 251 has a flat shape on the surface on the introduction space 253 side (anti-encapsulation space side) with no step between the inner peripheral edge portion 251b and the outer peripheral edge portion 251c and the pressure receiving portion 251. For this reason, in the diaphragm 251, the thickness T1 at the inner peripheral edge 251b and the outer peripheral edge 251c is thicker than the thickness T2 at the pressure receiving part 251a.

  Specifically, the barrier film 40 has a flat shape with no steps over the entire area from the pressure receiving portion 251a to the inner peripheral edge portion 251b and the outer peripheral edge portion 251c. The first rubber layer 31 closer to the enclosed space 252a than the barrier film 40 has a shape in which the thickness T3 at the inner peripheral edge portion 251b and the outer peripheral edge portion 251c is thicker than the thickness T4 at the pressure receiving portion 251a. In the second rubber layer 32 on the side opposite to the encapsulating space from the barrier film 40, the thickness T5 at the inner peripheral edge portion 251b and the outer peripheral edge portion 251c and the thickness T6 at the pressure receiving portion 251a have the same shape.

  Then, the above-described barrier film 40 is used as the first barrier film 40, and the second barrier film 60 separate from the first barrier film 40 is disposed inside the first rubber layer 31 in the inner peripheral edge 251b and the outer peripheral edge 251c. Has been. The second barrier film 60 is composed of the barrier material described in the first embodiment. The second barrier film 60 is disposed so that the planar direction of the second barrier film 60 is along the direction D1 perpendicular to the diaphragm surface. Similar to the planar shape of the diaphragm 251, the second barrier film 60 is arranged in an annular shape. In addition, the 2nd barrier film | membrane 60 may not be the shape which continued in the annular | circular shape in the circumferential direction of the annular | circular shaped inner peripheral edge part 251b and the outer peripheral edge part 251c, and may be a discontinuous shape.

  Thus, in this embodiment, the 2nd barrier film | membrane 60 is arrange | positioned inside the 1st rubber layer 31 in the inner peripheral part 251b and the outer peripheral part 251c. That is, the second barrier film 60 is provided inside the rubber main body 30 constituting the protruding portion 251p. In other words, the second barrier film 60 is provided at a position on the sealed space 252a side in the rubber body 30 constituting the inner peripheral edge 251b and the outer peripheral edge 251c.

  Therefore, the remaining length obtained by subtracting the length of the second barrier film 60 in the direction D1 perpendicular to the surface of the diaphragm 251 from the thickness T3 of the first rubber layer 31 at the inner peripheral edge 251b and the outer peripheral edge 251c. Is the thickness in the direction D1 perpendicular to the diaphragm surface of the single rubber portion 30a.

  Therefore, when the present embodiment and the examination example are compared with the same thicknesses of the inner peripheral edge and the outer peripheral edge and the thickness of the barrier film in the present embodiment and the examination example, the inner circumference 251b and the outer circumference 251c are compared. The thickness of the existing rubber single part 30a is thinner in the present embodiment than in the examination example. Therefore, also in this embodiment, there exists an effect similar to 1st Embodiment.

(Fourth embodiment)
In the present embodiment, the structure of the diaphragm 251 is changed with respect to the first embodiment, and the configuration other than the diaphragm 251 is the same as that of the first embodiment.

  As shown in FIG. 15, the diaphragm 251 of this embodiment is the same in the shape of the barrier film 40, the 1st rubber layer 31, and the 2nd rubber layer 32 as the diaphragm J251 of an examination example. Then, with the barrier film 40 as the first barrier film 40, the second barrier film 70 separate from the first barrier film 40 is provided over the entire surface of the first rubber layer 31 at the inner peripheral edge 251b and the outer peripheral edge 251c. ing. In other words, the second barrier film 70 separate from the first barrier film 40 is provided over the entire surface of the protruding portion 251p. The second barrier film 70 is formed by spray coating using a synthetic resin such as PVDC or PVA.

  Thus, in this embodiment, the 2nd barrier film | membrane 70 is arrange | positioned on the surface at the side of the enclosure space 252a of the 1st rubber layer 31 in the inner peripheral part 251b and the outer peripheral part 251c. That is, the second barrier film 70 is provided on the surface of the rubber main body 30 constituting the protruding portion 251p. In other words, the second barrier film 70 is provided at a position on the sealing space 252a side of the rubber main body 30 constituting the inner peripheral edge 251b and the outer peripheral edge 251c.

  For this reason, in the present embodiment, a portion between the second barrier film 70 and the barrier film 40 on the side surface of the protruding portion 251p in the first rubber layer 31 becomes a single rubber portion 30a through which the temperature-sensitive medium passes, The thickness of the single rubber part 30 is the same as the thickness T4 of the pressure receiving part 251a of the first rubber layer 31.

  Therefore, when the present embodiment and the examination example are compared with the same thicknesses of the inner peripheral edge and the outer peripheral edge and the thickness of the barrier film in the present embodiment and the examination example, the inner circumference 251b and the outer circumference 251c The thickness of the existing rubber single part 30a is thinner in the present embodiment than in the examination example. Therefore, also in this embodiment, there exists an effect similar to 1st Embodiment.

(Fifth embodiment)
In the present embodiment, the structure of the diaphragm 251 is changed with respect to the first embodiment, and the configuration other than the diaphragm 251 is the same as that of the first embodiment.

  As shown in FIG. 16, in the diaphragm 251 of the present embodiment, the inner peripheral edge portion 251b and the outer peripheral edge portion 251c protrude beyond the pressure receiving portion 251a on both the enclosed space 252a side and the introduction space 253 side (anti-encapsulated space side). Shape. Thereby, the diaphragm 251 of this embodiment has a shape in which the thickness T1 of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c is thicker than the thickness T2 of the pressure receiving portion 251a. These thicknesses T1 and T2 are the same as those in the first embodiment.

  The barrier film 40 is disposed inside the rubber body 30. The barrier film 40 has a flat shape with no steps over the entire area from the pressure receiving portion 251a to the inner peripheral edge portion 251b and the outer peripheral edge portion 251c. That is, the barrier film 40 has a uniform thickness, is continuous over the entire area from the pressure receiving portion 251a to the inner peripheral edge portion 251b and the outer peripheral edge portion 251c, and extends along the surface of the pressure receiving portion 251a. is there.

  The rubber main body 30 includes a first rubber layer 31 on the side of the enclosed space 252 a with respect to the barrier film 40 and a second rubber layer 32 on the side of the anti-encapsulated space with respect to the barrier film 40. The first and second rubber layers 31 and 32 are continuously formed from the pressure receiving portion 251a to the inner peripheral edge portion 251b and the outer peripheral edge portion 251c.

  The first rubber layer 31 has a shape in which the surface on the enclosed space 252a side of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c protrudes from the surface on the enclosed space 252a side of the pressure receiving portion 251a. For this reason, regarding the thickness of the first rubber layer 31 in the direction D1 perpendicular to the surface of the diaphragm 251, the thickness T3 at the inner peripheral edge portion 251b and the outer peripheral edge portion 251c is larger than the thickness T4 at the pressure receiving portion 251a. It is thick.

  The second rubber layer 32 has a shape in which the surfaces of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c on the anti-encapsulation space side protrude from the surface of the pressure receiving portion 251a on the anti-encapsulation space side. For this reason, regarding the thickness in the direction D1 perpendicular to the surface of the diaphragm 251 of the second rubber layer 32, the thickness T5 at the inner peripheral edge portion 251b and the outer peripheral edge portion 251c is larger than the thickness T6 at the pressure receiving portion 251a. It is thick.

  In the inner peripheral edge 251b and the outer peripheral edge 251c, the thickness T3 of the first rubber layer 31 in the direction D1 perpendicular to the surface of the diaphragm 251 is smaller than the thickness T5 of the second rubber layer 32. In this embodiment, the 1st rubber layer 31 of the inner peripheral part 251b and the outer peripheral part 251c becomes the rubber single-piece | unit part 30a.

  For this reason, when this embodiment and the examination example are compared, assuming that the thicknesses of the inner peripheral edge and the outer peripheral edge and the thickness of the barrier film in the present embodiment and the examination example are the same, the inner circumference 251b and the outer circumference 251c are compared. The thickness T3 of the rubber single part 30a existing in the present embodiment is thinner in the present embodiment than in the examination example.

  Therefore, according to this embodiment, as compared with the examination example, the rubber single part when the temperature-sensitive medium permeates through the inner peripheral edge 251b and the outer peripheral edge 251c in the direction D1 parallel to the surface of the diaphragm 251. The transmission area of 30a can be reduced, and the permeation of the temperature-sensitive medium at the inner peripheral edge 251b and the outer peripheral edge 251c can be suppressed.

(Sixth embodiment)
In the present embodiment, the structure of the diaphragm 251 is changed with respect to the first embodiment, and the configuration other than the diaphragm 251 is the same as that of the first embodiment.

  As shown in FIG. 17, the diaphragm 251 of the present embodiment has a flat shape in which the surface on the sealed space 252 a side has no step between the inner peripheral edge 251 b and the outer peripheral edge 251 c and the pressure receiving part 251. On the surface of the space 253 side (on the side opposite to the encapsulated space), the inner peripheral edge portion 251b and the outer peripheral edge portion 251c protrude from the pressure receiving portion 251a. Thereby, the diaphragm 251 of this embodiment has a shape in which the thickness T1 of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c is thicker than the thickness T2 of the pressure receiving portion 251a. These thicknesses T1 and T2 are the same as those in the first embodiment.

  The barrier film 40 is disposed inside the rubber body 30. The shape of the barrier film 40 is the same as that of the fifth embodiment.

  The rubber main body 30 includes a first rubber layer 31 on the side of the enclosed space 252 a with respect to the barrier film 40 and a second rubber layer 32 on the side of the anti-encapsulated space with respect to the barrier film 40. The first and second rubber layers 31 and 32 are continuously formed from the pressure receiving portion 251a to the inner peripheral edge portion 251b and the outer peripheral edge portion 251c.

  The first rubber layer 31 has a flat shape with no step between the surface of the inner peripheral edge 251b and the outer peripheral edge 251c on the side of the enclosed space 252a and the surface of the pressure receiving part 251a on the side of the enclosed space 252a. For this reason, regarding the thickness of the first rubber layer 31 in the direction D1 perpendicular to the surface of the diaphragm 251, the thickness T3 at the inner peripheral edge portion 251b and the outer peripheral edge portion 251c is the same as the thickness T4 at the pressure receiving portion 251a. It is.

  The second rubber layer 32 has a shape in which the surfaces of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c on the anti-encapsulation space side protrude from the surface of the pressure receiving portion 251a on the anti-encapsulation space side. For this reason, regarding the thickness in the direction D1 perpendicular to the surface of the diaphragm 251 of the second rubber layer 32, the thickness T5 at the inner peripheral edge portion 251b and the outer peripheral edge portion 251c is larger than the thickness T6 at the pressure receiving portion 251a. It is thick.

  And the diaphragm 251 of this embodiment also has a thickness T5 of the first rubber layer 31 in the direction D1 perpendicular to the surface of the diaphragm 251 at the inner peripheral edge 251b and the outer peripheral edge 251c, as in the fifth embodiment. The second rubber layer 32 is thinner than the thickness T3. Therefore, the present embodiment also provides the same effects as the fifth embodiment.

(Seventh embodiment)
In the present embodiment, the shape of the first rubber layer 31 on the enclosure space 252a side of the barrier film 40 is changed with respect to the diaphragm 251 of the fifth embodiment. The shapes of the barrier film 40 and the second rubber layer 32 are the same as those in the fifth embodiment.

  As shown in FIG. 18, in the diaphragm 251 of the present embodiment, the first rubber layer 31 closer to the enclosed space 252a than the barrier film 40 is provided only on the inner peripheral edge 251b and the outer peripheral edge 251c. The planar shape of the first rubber layer 31 is annular like the planar shape of the diaphragm 251. For this reason, the barrier film 40 is exposed on the sealed space 252a side of the pressure receiving portion 251a.

  Similarly to the fifth embodiment, the diaphragm 251 of the present embodiment also has a thickness T5 of the first rubber layer 31 in the direction D1 perpendicular to the surface of the diaphragm 251 at the inner peripheral edge 251b and the outer peripheral edge 251c. The rubber layer 32 is thinner than the thickness T3. Therefore, the present embodiment also provides the same effects as the fifth embodiment.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be appropriately modified within the scope described in the claims as follows.

  (1) In the first embodiment, the end portion 41 of the barrier film 40 is located on the inner peripheral end surface and the outer peripheral end surface of the diaphragm 251. However, as in the second embodiment, the inner peripheral portion 251b and the outer peripheral portion. It is preferable to be located on the surface of the enclosed space 252a of 251c.

  (2) In the second embodiment, the end portion 41 of the barrier film 40 is located on the surface of the inner peripheral edge portion 251b and the outer peripheral edge portion 251c on the sealed space 252a side. However, as in the first embodiment, the diaphragm 251 may be located on the inner peripheral end face and the outer peripheral end face. In this case, since the protrusion height H1 of the first protrusion 251p1 is lower than the protrusion height H2 of the second protrusion 251p2, the first edge at the inner peripheral edge 251b and the outer peripheral edge 251c is the same as in the fifth embodiment. The thickness of the rubber layer 31, that is, the thickness of the rubber single part existing in the inner peripheral edge and the outer peripheral edge can be made thinner than that in the study example. Therefore, also in this case, permeation of the temperature sensitive medium at the inner peripheral edge 251b and the outer peripheral edge 251c can be suppressed.

  (3) In the third and fourth embodiments, the first barrier film 40 has reached the inner peripheral end face and the outer peripheral end face of the diaphragm 251, but the first barrier film 40 is at least disposed on the pressure receiving portion 251a. Good. This is because the second barrier films 60 and 70 can suppress permeation of the temperature sensitive medium at the inner peripheral edge 251b and the outer peripheral edge 251c.

  (4) In each of the above embodiments, the base fabric 50 is embedded in the rubber main body 30, but the base fabric 50 may be omitted. Further, a reinforcing member other than the base fabric 50 may be embedded in the rubber body 30.

  (5) In each of the above-described embodiments, the diaphragm 251 has a ring shape, but may have another shape as long as it is a ring shape.

  (6) In each of the above embodiments, the diffuser body 230 and the lid member 252b constitute a holding part that holds the diaphragm 251, but a member that is separate from the diffuser body 230 may constitute the holding part. .

  (7) In each of the above embodiments, the passage forming member 240 employs an isosceles triangular cross-sectional shape, but is not limited thereto. The passage forming member 240 has, for example, an axial cross-sectional shape in which two sides sandwiching the apex are convex on the inner peripheral side, two sides are convex on the outer peripheral side, or a cross-sectional shape is semicircular. A thing may be adopted.

  (8) In each of the above-described embodiments, the example in which the swirl space 221 is formed in the nozzle body 220 has been described. However, the present invention is not limited to this. For example, the swirl space 221 may be formed in the housing body 210.

  (9) In each of the above embodiments, an example in which most of the elements constituting the body 200, the passage forming member 240, the driving means 250, and the like are configured by metal members has been described, but the present invention is not limited to this. Each component may be made of a material other than a metal member (for example, resin) as long as pressure resistance, heat resistance, and the like are not problematic.

  (10) In each of the above-described embodiments, the example in which the ejector 100 of the present invention is applied to the refrigeration cycle 10 of the vehicle air conditioner has been described. However, the present invention is not limited thereto, and for example, a heat pump cycle used for a stationary air conditioner Alternatively, the ejector 100 of the present invention may be applied.

  (11) In each of the above embodiments, the HFC-based refrigerant is employed as the refrigerant of the refrigeration cycle 10, but other refrigerants such as carbon dioxide may be employed.

  (12) In each of the above-described embodiments, the elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Needless to say.

  (13) In each of the above-described embodiments, when a numerical value such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment is mentioned, it is clearly indicated that it is essential and a specific number clearly in principle. It is not limited to the specific number except when limited to.

  (14) In each of the above-described embodiments, when referring to the shape, positional relationship, etc. of the component, etc., unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to shape, positional relationship, and the like.

10 Refrigeration cycle 100 Ejector 200 Body 224 Nozzle passage
230 Diffuser body (diaphragm holder)
232a Diffuser passage 240 Passage forming member 251 Annular diaphragm 251b Inner peripheral edge of diaphragm 251c Outer peripheral edge of diaphragm 252a Temperature-sensitive medium enclosed space 252b Lid member (diaphragm holding part)

Claims (11)

An ejector applied to a vapor compression refrigeration cycle (10),
A swirling space (221) for swirling the refrigerant flowing in from the refrigerant inlet (211), a pressure reducing space (222) for depressurizing the refrigerant flowing out of the swirling space, and a refrigerant flow downstream of the pressure reducing space communicating with the outside Suction passage (231) for sucking the refrigerant from, and a pressure increase space (232) for increasing the pressure by mixing the refrigerant injected from the decompression space and the suction refrigerant sucked from the suction passage. Body (200),
A passage forming member (240) formed in a shape in which at least a part is disposed in the interior of the decompression space and the interior of the pressurization space, and the cross-sectional area increases with distance from the decompression space;
An annular diaphragm (251) disposed inside the body so as to surround the axis of the passage forming member and connected to the passage forming member;
A refrigerant passage formed between an inner peripheral surface of a portion of the body that forms the pressure reducing space and an outer peripheral surface of the passage forming member serves as a nozzle that decompresses and injects the refrigerant flowing out of the swirling space. A functioning nozzle passage (224),
A refrigerant passage formed between an inner peripheral surface of a portion of the body that forms the pressurizing space and an outer peripheral surface of the passage forming member serves as a diffuser that increases the pressure by mixing the injected refrigerant and the suction refrigerant. A functioning diffuser passage (232a),
The body holds the inner peripheral edge portion (251b) and the outer peripheral edge portion (251c) of the diaphragm and holds a holding portion (252a) that encloses a temperature sensitive medium on one surface side of the diaphragm. 230, 252b)
The temperature sensitive medium is enclosed in the enclosed space of the holding portion so that the temperature of the suction refrigerant flowing through the suction passage is transmitted to the temperature sensitive medium,
The temperature sensitive medium is one whose pressure changes according to the temperature of the suction refrigerant,
The diaphragm is adapted to be displaced according to the pressure of the temperature sensitive medium,
The diaphragm has a rubber main body (30) made of a rubber material and a barrier film (40, 60, 70) that is integrated with the rubber main body and has a lower temperature-sensitive medium permeability than the rubber main body. Configured,
The ejector according to claim 1, wherein the inner peripheral edge and the outer peripheral edge have the barrier film (40, 60, 70) disposed at least at a position on the sealed space side of the rubber main body constituting them. The inner peripheral edge portion and the outer peripheral edge portion have protrusions (251p, 251p1) that protrude to the enclosed space side from the pressure receiving portion (251a) that receives the pressure of the temperature sensitive medium,
The ejector according to claim 1, wherein the barrier film (40, 60, 70) is provided inside or on the surface of the rubber main body constituting the protruding portion.   The barrier film is continuous from the pressure receiving portion (251a) that receives the pressure of the temperature sensitive medium to the inner peripheral edge and the outer peripheral edge, and extends along the surface of the pressure receiving portion inside the pressure receiving portion. The ejector according to claim 2, wherein the ejector has a shape bent toward the sealed space inside the inner peripheral edge and the outer peripheral edge. When the protrusion is the first protrusion,
The inner peripheral edge and the outer peripheral edge have the first protrusion and a second protrusion (251p1) that protrudes to the side opposite to the enclosing space from the pressure receiving part,
The second projecting portion has a first bending portion (30b) located on the pressure receiving portion side and a second bending portion (30c) located on the counter pressure receiving portion side, and the radius of curvature of the first bending portion. The ejector according to claim 3, wherein is larger than a radius of curvature of the second curved portion.   The ejector according to claim 3 or 4, wherein an end portion (41) of the barrier film is located on a surface of the inner peripheral edge portion and the outer peripheral edge portion on the sealed space side. The barrier film is provided on a first pressure-receiving portion (251a) that receives the pressure of the temperature-sensitive medium, and is provided on the inner peripheral edge and the outer peripheral edge, and the first barrier film A separate second barrier film (60),
3. The ejector according to claim 2, wherein the second barrier film is provided inside the rubber main body constituting the protruding portion. The barrier film is provided on a first pressure-receiving portion (251a) that receives the pressure of the temperature-sensitive medium, and is provided on the inner peripheral edge and the outer peripheral edge, and the first barrier film A separate second barrier film (70),
3. The ejector according to claim 2, wherein the second barrier film is formed by spray coating of a synthetic resin on a surface of the rubber main body constituting the protruding portion. An ejector applied to a vapor compression refrigeration cycle (10),
A swirling space (221) for swirling the refrigerant flowing in from the refrigerant inlet (211), a pressure reducing space (222) for depressurizing the refrigerant flowing out of the swirling space, and a refrigerant flow downstream of the pressure reducing space communicating with the outside Suction passage (231) for sucking the refrigerant from, and a pressure increase space (232) for increasing the pressure by mixing the refrigerant injected from the decompression space and the suction refrigerant sucked from the suction passage. Body (200),
A passage forming member (240) formed in a shape in which at least a part is disposed in the interior of the decompression space and the interior of the pressurization space, and the cross-sectional area increases with distance from the decompression space;
An annular diaphragm (251) disposed inside the body so as to surround the axis of the passage forming member and connected to the passage forming member;
A refrigerant passage formed between an inner peripheral surface of a portion of the body that forms the pressure reducing space and an outer peripheral surface of the passage forming member serves as a nozzle that decompresses and injects the refrigerant flowing out of the swirling space. A functioning nozzle passage (224),
A refrigerant passage formed between an inner peripheral surface of a portion of the body that forms the pressurizing space and an outer peripheral surface of the passage forming member serves as a diffuser that increases the pressure by mixing the injected refrigerant and the suction refrigerant. A functioning diffuser passage (232a),
The body holds the inner peripheral edge portion (251b) and the outer peripheral edge portion (251c) of the diaphragm and holds a holding portion (252a) that encloses a temperature sensitive medium on one surface side of the diaphragm. 230, 252b)
The temperature sensitive medium is enclosed in the enclosed space of the holding portion so that the temperature of the suction refrigerant flowing through the suction passage is transmitted to the temperature sensitive medium,
The temperature sensitive medium is one whose pressure changes according to the temperature of the suction refrigerant,
The diaphragm is adapted to be displaced according to the pressure of the temperature sensitive medium,
The diaphragm includes a rubber main body (30) made of a rubber material, and a barrier film (40) that is integrated with the rubber main body and has a lower temperature-sensitive medium permeability than the rubber main body. ,
The barrier film is continuous from the pressure receiving part (251a) receiving the pressure of the temperature sensitive medium to the inner peripheral edge and the outer peripheral edge and extends along the surface of the pressure receiving part.
The inner peripheral edge and the outer peripheral edge are formed of the barrier film, the first rubber layer (31) closer to the enclosed space than the barrier film of the rubber body, and the barrier film of the rubber body. A second rubber layer (32) on the side of the anti-encapsulation space,
A thickness (T3) of the first rubber layer in a direction perpendicular to the surface of the diaphragm is thinner than a thickness (T5) of the second rubber layer in a direction perpendicular to the surface of the diaphragm. Ejector. The first and second rubber layers are continuous from the pressure receiving portion to the inner peripheral edge and the outer peripheral edge,
The first rubber layer has a shape in which the surface on the enclosed space side of the inner peripheral edge and the outer peripheral edge protrudes from the surface on the enclosed space side of the pressure receiving part,
9. The second rubber layer according to claim 8, wherein the surface of the inner peripheral edge portion and the outer peripheral edge portion of the anti-encapsulation space side protrudes from the surface of the pressure receiving portion on the anti-encapsulation space side. The ejector described. The first and second rubber layers are continuous from the pressure receiving portion to the inner peripheral edge and the outer peripheral edge,
The first rubber layer has a shape in which there is no step between a surface on the sealed space side of the inner peripheral edge and the outer peripheral edge and a surface on the sealed space side of the pressure receiving part,
9. The second rubber layer according to claim 8, wherein the surface of the inner peripheral edge portion and the outer peripheral edge portion of the anti-encapsulation space side protrudes from the surface of the pressure receiving portion on the anti-encapsulation space side. The ejector described. The first rubber layer is formed annularly only on the inner peripheral edge and the outer peripheral edge of the diaphragm,
The second rubber layer is continuous from the pressure receiving portion to the inner peripheral edge portion and the outer peripheral edge portion, and a surface of the inner peripheral edge portion and the outer peripheral edge portion on the anti-encapsulation space side is an anti-encapsulation space of the pressure receiving portion. The ejector according to claim 8, wherein the ejector has a shape protruding from a surface on the side.

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