JP2017025841A - Ejector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ejector for making compatible the interfacial leakage suppression and the penetration suppression of a temperature-sensitive medium at the inner peripheral edge part and the outer peripheral edge part of a diagram.SOLUTION: An inner peripheral edge part 251b and an outer peripheral edge part comprises: a first portion 50 containing a portion, in which the end part 41 of a barrier membrane 40 contacts with an upper side holding face 252d; and a second portion 60, in which a rubber body 30 contacts with an upper side holding face 252d. The second portion 60 includes, in the natural state, in which it is not sandwiched between the upper side holding face 252d and the lower side holding face 230d, and at a position spaced from the first portion 50, and, on the lower face 73 of an inner peripheral edge part 251b, a projection 61 protruding toward the side of the lower side holding face 230d.SELECTED DRAWING: Figure 12

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.

  A decompression space for depressurizing the refrigerant, a suction passage for sucking the refrigerant from the outside, and a pressurization space for mixing and increasing the pressure of the refrigerant injected from the decompression space and the suction refrigerant sucked from the suction passage are formed. Patent Document 1 discloses an ejector including a body formed, a passage forming member that is disposed inside a pressure reducing space and a pressure increasing space, and that forms a nozzle passage and a diffuser passage, and a diaphragm that is linked to the passage forming member. Yes.

  The body has a sealed space forming part that holds the diaphragm and forms a sealed space for sealing the temperature-sensitive medium on one surface side of the diaphragm. The diaphragm and the enclosure space are arranged inside the body so as to surround the axis of the passage forming member. In the enclosed space, the temperature of the temperature-sensitive medium is transmitted so that the temperature of the suction refrigerant flowing through the suction passage is transmitted to the temperature-sensitive medium, and the pressure of the temperature-sensitive medium changes according to the temperature change of the suction refrigerant. It is enclosed.

  With such an arrangement, in the ejector of Patent Document 1, the passage forming member is displaced in accordance with the load fluctuation of the refrigeration cycle, and the passage areas of the nozzle passage and the diffuser passage are adjusted to meet the load of the refrigeration cycle. Realizes the operation of the ejector.

JP 2013-177879 A

  By the way, this inventor examined the diaphragm J251 of the structure described below as a diaphragm used for the ejector of patent document 1 mentioned above. Below, this is called the diaphragm of the examination example.

  As shown in FIG. 23, 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. 24, the diaphragm J251 is held by sandwiching the inner peripheral edge J251b and the outer peripheral edge J251c between the upper holding surface 252d and the lower holding surface 230d. The upper holding surface 252d is provided in an upper mating member 252b that forms a temperature-sensitive medium enclosed space 252a on the upper surface side of the diaphragm J251. The lower holding surface 230d is provided on the lower mating member 230 that forms the space 253 on the lower surface side of the diaphragm J251.

  The diaphragm J251 of the examination example is mainly composed of the rubber main body 30. For this reason, the inner peripheral edge portion J251b and the outer peripheral edge portion J251c generate elasticity (repulsive force) of the rubber main body 30 when the rubber main body 30 is compressed. Utilizing the elasticity of the rubber main body 30, the gap between the diaphragm J251 and the upper holding surface 252d is filled and sealed. This suppresses leakage of the temperature sensitive medium from the contact interface between the diaphragm J251 and the upper mating member 252b. That is, the interface leakage of the temperature sensitive medium is suppressed.

  Diaphragm J251 of the examination example is integrated with a barrier film 40 that suppresses permeation of the temperature sensitive medium. The barrier film 40 is disposed in the rubber body 30 from the pressure receiving portion J251a of the diaphragm J251 to the inner peripheral edge portion J251b and the outer peripheral edge portion J251c.

  As shown in FIG. 25, in the inner peripheral edge portion J251b and the outer peripheral edge portion J251c, the end portion 41 of the barrier film 40 is located on the contact surface J72 of the diaphragm J251 that contacts the upper holding surface 252d. The end portion 41 is in contact with the upper holding surface 252d. For this reason, the barrier film 40 exists over the entire path in the case where the temperature-sensitive medium in the gas phase attempts to pass through the diaphragm J251. Thereby, it is suppressed that a temperature sensitive medium permeate | transmits the diaphragm J251, and leaks outside the enclosed space 252a. That is, the permeation of the temperature sensitive medium is suppressed.

  Thus, in order to suppress leakage of the temperature sensitive medium from the inner peripheral edge 251b and the outer peripheral edge 251c of the diaphragm J251, the following two points are necessary.

  (1) In order to suppress the interface leakage of the temperature sensitive medium, the seal surface pressure is secured. The seal surface pressure is a force (that is, a surface pressure) by which the contact surface J72 of the diaphragm J251 presses the upper holding surface 252d, and is a surface pressure necessary for suppressing interface leakage.

  (2) In order to suppress the permeation of the temperature sensitive medium, the barrier film 40 is brought into contact with the upper holding surface 252d.

  However, in the diaphragm J251 of the study example, it has been found that it may be difficult to satisfy the above (1) for the following reason.

  The barrier film 40 is made of a material that is more difficult to deform than the rubber body 30 such as a synthetic resin. Therefore, in a state where the diaphragm J251 is sandwiched between the upper holding surface 252d and the lower holding surface 230d, the barrier film 40 is stretched against the upper holding surface 252d. As a result, the amount of deformation of the rubber body is smaller than when the upper holding surface 252d and the lower holding surface 230d have the same tightening force and the inner peripheral edge J251b and the outer peripheral edge J251c are formed of a single rubber main body. Small, resulting in less elasticity. Therefore, the surface pressure of the contact surface J72 of the diaphragm J251 becomes low, and it may be difficult to ensure the seal surface pressure.

  In particular, in the ejector of Patent Document 1 described above, after the product is manufactured and stored before the product is shipped, the storage location becomes high temperature, and the pressure of the temperature sensitive medium is higher than when the refrigeration cycle is used. Become. In this case, it is difficult to ensure the seal surface pressure.

  In addition, the above-mentioned problem becomes remarkable when the diaphragm J251 is cyclic | annular. When the diaphragm J251 is annular, the edges held by the upper holding surface 252d and the lower holding surface 230d are on both the inner peripheral side and the outer peripheral side. For this reason, as compared with the case where the edges held by the upper holding surface 252d and the lower holding surface 230d are only on the outer peripheral side, the number of locations where the temperature sensitive medium leaks increases, and the inner peripheral edge 251b and the outer Leakage of the temperature sensitive medium at the peripheral edge 251c becomes a big problem.

  Further, the above 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 pressure-receiving portion is used for the inner peripheral edge and the outer peripheral edge of the diaphragm, for example, to secure a seal between the diaphragm and the upper holding surface. It cannot be reduced as much. For this reason, the ratio of the inner periphery part and the outer periphery part with respect to a pressure receiving part increases, and the leakage of the temperature sensitive medium in an inner periphery part and an outer periphery part becomes a big problem.

  In view of the above points, an object of the present invention is to achieve both the interface leakage suppression and the permeation suppression of the temperature-sensitive medium at the inner peripheral edge and the outer peripheral edge of the diaphragm.

In order to achieve the above object, in the invention described in claim 1,
An ejector applied to a vapor compression refrigeration cycle (10),
From the decompression space (222) for decompressing the refrigerant flowing in from the refrigerant inlet (211), the suction passage (231) communicating with the downstream side of the refrigerant flow in the decompression space and sucking the coolant from the outside, and the decompression space A body (200) in which a pressurizing space (232) for mixing and injecting the jetted refrigerant and the suction refrigerant sucked from the suction passage is formed;
At least a portion is disposed inside the decompression space and the boosting space, and the refrigerant flowing from the refrigerant inlet is decompressed and injected between the body and the inner peripheral surface of the part forming the decompression space. A diffuser that functions as a diffuser that forms a nozzle passage (224) that functions as a nozzle that performs and boosts the pressure by mixing the injected refrigerant and the suction refrigerant between the inner peripheral surface of a portion of the body that forms the pressure increasing space A passage forming member (240) forming a passage (232a);
It is arranged inside the body so as to surround the axis (X) of the passage forming member, and has one surface (72) on one side in the axial direction of the passage forming member and the other surface (73) on the other side in the axial direction. The shape when viewed from the axial direction is an annular shape having an inner peripheral edge (251b) and an outer peripheral edge (251c), and includes a diaphragm (251) that interlocks with the passage forming member,
The body has a sealed space forming part (230, 252b) that holds the diaphragm and forms a sealed space (252a) for sealing the temperature-sensitive medium on one surface side of the diaphragm,
In the enclosed space, the temperature of the temperature-sensitive medium is transmitted so that the temperature of the suction refrigerant flowing through the suction passage is transmitted to the temperature-sensitive medium, and the pressure of the temperature-sensitive medium changes according to the temperature change of the suction refrigerant. Is enclosed,
The enclosed space forming portion includes a first holding surface (252d) in contact with one surface of each of the inner peripheral edge portion and the outer peripheral edge portion, and a second holding surface in contact with the other surfaces of the inner peripheral edge portion and the outer peripheral edge portion ( 230d), the first holding surface and the second holding surface are held across the inner peripheral edge and the outer peripheral edge,
The diaphragm has 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 disposed over the entire area of the pressure receiving portion (251a) facing the enclosed space in the diaphragm, and extends from the pressure receiving portion to both the inner peripheral edge and the outer peripheral edge.
Each of the inner peripheral edge portion and the outer peripheral edge portion includes a first portion (50) including a portion (41) in which the barrier film is in contact with the first holding surface, and a rubber body in contact with the first holding surface. 2 sites (60)
The second part is a natural state in which the inner peripheral edge part and the outer peripheral edge part are not sandwiched between the first holding surface and the second holding surface, and at a position away from the first part, It has a protrusion (61, 62) on at least one of the other surfaces.

  In the first aspect of the invention, since the second part is provided at a position away from the first part, the rubber body is compressed in the second part without being affected by the tension of the barrier film. For this reason, compared with the diaphragm of the examination example, the contact surface pressure of the second part with respect to the first holding surface can be increased, and the seal surface pressure can be secured. Furthermore, since the barrier film is in contact with the first holding surface at the first portion, the transmission of the diaphragm of the temperature sensitive medium can be suppressed.

  Therefore, according to the first aspect of the present invention, it is possible to achieve both the interface leakage suppression and the permeation suppression of the temperature sensitive medium at the inner peripheral edge and the outer peripheral edge of the diaphragm.

In the invention according to claim 4,
An ejector applied to a vapor compression refrigeration cycle (10),
From the decompression space (222) for decompressing the refrigerant flowing in from the refrigerant inlet (211), the suction passage (231) communicating with the downstream side of the refrigerant flow in the decompression space and sucking the coolant from the outside, and the decompression space A body (200) in which a pressurizing space (232) for mixing and injecting the jetted refrigerant and the suction refrigerant sucked from the suction passage is formed;
At least a portion is disposed inside the decompression space and the boosting space, and the refrigerant flowing from the refrigerant inlet is decompressed and injected between the body and the inner peripheral surface of the part forming the decompression space. A diffuser that functions as a diffuser that forms a nozzle passage (224) that functions as a nozzle that performs and boosts the pressure by mixing the injected refrigerant and the suction refrigerant between the inner peripheral surface of a portion of the body that forms the pressure increasing space A passage forming member (240) forming a passage (232a);
It is arranged inside the body so as to surround the axis (X) of the passage forming member, and has one surface (72) on one side in the axial direction of the passage forming member and the other surface (73) on the other side in the axial direction. The shape when viewed from the axial direction is an annular shape having an inner peripheral edge (251b) and an outer peripheral edge (251c), and includes a diaphragm (251) that interlocks with the passage forming member,
The body has a sealed space forming part (230, 252b) that holds the diaphragm and forms a sealed space (252a) for sealing the temperature-sensitive medium on one surface side of the diaphragm,
In the enclosed space, the temperature of the temperature-sensitive medium is transmitted so that the temperature of the suction refrigerant flowing through the suction passage is transmitted to the temperature-sensitive medium, and the pressure of the temperature-sensitive medium changes according to the temperature change of the suction refrigerant. Is enclosed,
The enclosed space forming portion includes a first holding surface (252d) that contacts one surface side of each of the inner peripheral edge portion and the outer peripheral edge portion, and a second holding contact that contacts each other surface side of the inner peripheral edge portion and the outer peripheral edge portion. A first holding surface and a second holding surface with the inner peripheral edge and the outer peripheral edge sandwiched therebetween,
An annular inner peripheral rubber member (81) along the circumferential direction of the inner peripheral edge is provided on a portion of the first holding surface facing the inner peripheral edge, and the outer side of the first holding surface is outside. An annular outer peripheral rubber member (82) along the circumferential direction of the outer peripheral edge is provided on a part of the portion facing the peripheral edge,
The diaphragm has 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 disposed over the entire surface of the pressure receiving portion (251a) facing the sealed space in the diaphragm on one surface of the diaphragm, and extends from the pressure receiving portion to both the inner peripheral edge and the outer peripheral edge.
The inner peripheral rubber member is held in a state where the inner peripheral rubber member is sandwiched between the first holding surface and the inner peripheral edge, and the barrier film is in contact with the first holding surface,
The outer peripheral side rubber member is held between the first holding surface and the outer peripheral edge, and the outer peripheral edge is held in a state where the barrier film is in contact with the first holding surface. Yes.

  In the invention according to claim 4, since the inner peripheral side rubber member and the outer peripheral side rubber member which are separate from the diaphragm are used, the inner peripheral side rubber member and the outer peripheral side rubber member are affected by the tension of the barrier film. It is compressed without receiving. For this reason, compared with the diaphragm of the examination example, each contact surface pressure of the inner peripheral side rubber member and the outer peripheral side rubber member with respect to the first holding surface can be increased, and the seal surface pressure can be secured. Furthermore, since the inner peripheral edge and the outer peripheral edge are held in a state where the barrier film is in contact with the first holding surface, it is possible to suppress the transmission of the diaphragm of the temperature sensitive medium.

  Therefore, according to the invention described in claim 4, it is possible to achieve both the interface leakage suppression and the permeation suppression of the temperature sensitive medium at the inner peripheral edge and the outer peripheral edge of the diaphragm.

  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 sectional drawing of the diaphragm which concerns on 1st Embodiment which shows the state before holding | maintenance. It is sectional drawing of the diaphragm which concerns on 1st Embodiment which shows the state after holding | maintenance. It is an enlarged view of the XII part of FIG. It is an enlarged view of the XIII part of FIG. It is an expanded sectional view of the diaphragm which concerns on 2nd Embodiment which shows the state before holding | maintenance. It is an expanded sectional view of the diaphragm which concerns on 2nd Embodiment which shows the state after holding | maintenance. It is an expanded sectional view of the diaphragm which concerns on 3rd Embodiment which shows the state before holding | maintenance. It is an expanded sectional view of the diaphragm which concerns on 3rd Embodiment which shows the state after holding | maintenance. It is an expanded sectional view of the diaphragm which concerns on 4th Embodiment which shows the state before holding | maintenance. It is an expanded sectional view of the diaphragm which concerns on 4th Embodiment which shows the state after holding | maintenance. It is sectional drawing of the member which has a diaphragm which concerns on 5th Embodiment which shows the state after holding | maintenance, an upper holding surface, and a lower holding surface. It is an enlarged view of the XXI part of FIG. It is an expanded sectional view of the member which has a diaphragm which concerns on 5th Embodiment which shows the state before holding | maintenance, an upper holding surface, and a lower holding surface. 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 XXIV-XXIV cross section of FIG. It is an enlarged view of the XXV-XXV 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)
As shown in FIG. 1, in this embodiment, the ejector 100 of 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.

  As shown in FIG. 4, the ejector 100 of the present embodiment includes a body 200, a passage forming member 240, and a drive unit 250 that displaces the passage forming member 240 as main components.

  The body 200 is 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 is a member that forms the outer shell of the ejector 100 as shown in FIG. 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.

  As shown in FIGS. 4 and 5, the diffuser body 230 of the present embodiment has a rotating body-shaped through hole 230 a penetrating the front and back at the center thereof, and a drive described later on the outer peripheral side of the through hole 230 a. It is comprised with the cyclic | annular metal member in which the groove part 230b for accommodating a means was formed. 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.

  As shown in FIG. 4, a suction space 231 a for retaining the refrigerant flowing in from the refrigerant suction port 212 is formed between the upper surface of the diffuser body 230 and the lower surface of the nozzle body 220 facing the diffuser body 230. 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 configured by a substantially conical metal member. For this reason, the shortest distance between the outer peripheral surface of the passage forming member 240 and the central axis (axis line X) of the passage forming member 240 increases as the distance from the decompression space 222 increases. The passage forming member 240 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. The passage forming member 240 is disposed so that the central 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.

  As shown in FIGS. 4 and 5, the diaphragm 251 of this embodiment has an annular shape when viewed from the direction of the axis X so that the diaphragm 251 can be disposed in an annular groove 230 b formed in the diffuser body 230. It is said that. 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. The diaphragm 251 has one surface 72 on the upper side that is one side in the direction of the axis X of the passage forming member 240, and the other surface 73 on the lower side that is the other side in the direction of the axis X. A specific configuration of the diaphragm 251 will be described later.

  As shown in FIG. 6, the diaphragm 251 of the present embodiment has a pressure receiving portion 251a, an inner peripheral edge portion 251b, and an outer peripheral edge portion 251c. The pressure receiving portion 251a is a portion of the diaphragm 251 that faces a sealed space 252a described later. Both the inner peripheral edge 251b and the outer peripheral edge 251c have a lower holding surface 230d provided in the groove 230b of the diffuser body 230, and an upper holding surface 252d provided in an annular lid member 252b that closes the groove 230b. It is held between. The lower holding surface 230d and the upper holding surface 252d are surfaces that hold the inner peripheral edge portion 251b and the outer peripheral edge portion 251c while sandwiching them from both sides in the vertical direction. The upper holding surface 252d is in contact with one surface (that is, the upper surface) 72 of the inner peripheral edge 251b and the outer peripheral edge 251c. The lower holding surface 230d is in contact with the other surface (that is, the lower surface) 73 of the inner peripheral edge 251b and the outer peripheral edge 251c. In this state, the diaphragm 251 is fixed to the diffuser body 230 by means such as caulking.

  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 gas-liquid mixed phase temperature sensitive medium whose pressure changes according to the temperature of the refrigerant flowing out of the evaporator 13 is enclosed. doing.

  Therefore, in the present embodiment, the diffuser body 230 and the lid member 252b of the body 200 constitute a sealed space forming portion that holds and holds the diaphragm 251 and forms a sealed space 252a on one surface side of the diaphragm 251. . In the present embodiment, the upper holding surface 252d and the lower holding surface 230d correspond to the first holding surface and the second holding surface described in the claims, respectively.

  A temperature-sensitive medium (for example, R134a) composed mainly 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. For example, a mixed fluid of a refrigerant circulating in the cycle and helium gas may be employed as the temperature sensitive medium.

  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. Thereby, the diaphragm 251 and the channel | path formation member 240 interlock | cooperate.

  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 other surface 73 in the diaphragm 251, ie, the surface 73 by the side of the introduction space 253, may be supported.

  In order to appropriately transmit the displacement of the diaphragm 251 to the operating rod 254a, the plate member 254b of the present 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 ( (See FIG. 5).

  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 (choking), and the gas-liquid mixed phase refrigerant that has reached the speed of sound by this choking is diverted to the end of 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 is improved by efficiently accelerating the refrigerant in the gas-liquid mixed phase state to the sound speed by the boiling promotion by both the wall surface boiling and the interface boiling. Can do.

  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 FIGS. 10 and 11, the diaphragm 251 of this embodiment suppresses the permeation of the rubber main body 30 that forms the outer shape of the diaphragm 251 and the temperature-sensitive medium in the gas phase state, similarly to the diaphragm J251 of the examination example. The barrier film 40 to be integrated is integrated. FIG. 10 shows a sectional view of the diaphragm 251 in a state before being held between the lower holding surface 230d and the upper holding surface 252d. The state of the diaphragm 251 when the ejector 100 shown in FIG. 4 is disassembled is also the same as the state of the diaphragm 251 shown in FIG. The state of the diaphragm 251 shown in FIG. 10 shows a natural state that is not sandwiched between the lower holding surface 230d and the upper holding surface 252d. FIG. 11 shows a cross-sectional view of the diaphragm 251 in a state of being held between the lower holding surface 230d and the upper holding surface 252d. However, FIG. 11 shows a state where there is no actuating rod 254a and plate member 254b.

  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 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. Examples of such a barrier material include EVOH (ethylene vinyl alcohol copolymer), PI (polyimide), PVDC (polyvinylidene chloride), PA (polyamide), PET (polyethylene terephthalate), and PVA (polyvinyl alcohol). Synthetic resins are mentioned. 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.

  As shown in FIGS. 10 and 11, the barrier film 40 is disposed in the rubber body 30 over the entire area of the pressure receiving portion 251a and extends from the pressure receiving portion 251a to both the inner peripheral edge portion 251b and the outer peripheral edge portion 251c. ing. In other words, the barrier film 40 is continuous from the inner peripheral edge 251b to the outer peripheral edge 251c through the pressure receiving part 251a.

  As shown in FIG. 13, the inner peripheral edge 251b includes a first portion 50 including a portion where the end 41 of the barrier film 40 is in contact with the upper holding surface 252d, and the rubber body 30 on the upper holding surface 252d. And a second portion 60 that is in contact. In the following, the inner peripheral edge portion 251b will be described, but the outer peripheral edge portion 251c has the same structure as the inner peripheral edge portion 251b.

  The first portion 50 is a portion for suppressing the transmission of the temperature-sensitive medium in the inner peripheral edge portion 251b in the state of being held between the lower holding surface 230d and the upper holding surface 252d. The first part 50 is located on the side farther from the enclosed space 252a than the second part 60.

  The first part 50 is a part where the barrier film 40 is exposed from the rubber body 30 on the upper surface 72 of the inner peripheral edge 251b in the natural state shown in FIG. Here, the upper surface 72 of the inner peripheral edge 251b is a surface in contact with the upper holding surface 252d when the inner peripheral edge 251b is sandwiched between the lower holding surface 230d and the upper holding surface 252d, as shown in FIG. is there. In the present embodiment, with the end 71 on the side away from the enclosed space 252a as a boundary, the surface that contacts the upper holding surface 252d is the upper surface 72 of the inner peripheral edge 251b, and the surface that contacts the lower holding surface 230d is the inner peripheral edge. It is the lower surface 73 of 251b.

  More specifically, in the natural state shown in FIG. 12, the first portion 50 extends obliquely, not in a shape extending parallel to the direction DR1 parallel to the lower holding surface 230d and the upper holding surface 252d. Shape. That is, the first part 50 has a shape extending from the side close to the enclosing space 252a toward the side away from the enclosing space 252a and extending from the upper holding surface 252d side toward the lower holding surface 230d side. In FIG. 12, the upper side of the inner peripheral edge portion 251b is the upper holding surface 252d side, the lower side of the inner peripheral edge portion 251b is the lower holding surface 230d side, and the left side of the inner peripheral edge portion 251b is the side closer to the enclosed space 252a. The right side of the inner peripheral edge 251b is the side away from the enclosed space 252a.

  In other words, the first portion 50 includes the upper surface side contact surfaces 51 and 52 that contact the upper holding surface 252d and the lower surface side contact surface 53 that contacts the lower holding surface 230d in the sandwiched state shown in FIG. Have. The upper surface side contact surfaces 51 and 52 and the lower surface side contact surface 53 respectively correspond to the one surface side contact surface and the other surface side contact surface described in the claims.

  The upper surface side contact surfaces 51 and 52 have the 1st surface 51 and the 2nd surface 52 located in the side farther from the enclosure space 252a than the 1st surface 51 in the natural state shown in FIG. The upper surface side contact surfaces 51 and 52 are bent so that the second surface 52 is positioned closer to the lower surface 73 side (that is, the lower holding surface 230 d side) of the inner peripheral edge 251 b than the first surface 51. On the second surface 52, the end 41 of the barrier film 40 is exposed from the rubber body 30.

  The lower surface side contact surface 53 is inclined with respect to the first surface 51 so as to be separated from the first surface 51 as it is separated from the enclosed space 252a in the natural state shown in FIG. The lower surface side contact surface 53 is inclined with respect to the direction DR2 perpendicular to the upper holding surface 252d and the lower holding surface 230d. A direction DR2 perpendicular to the upper holding surface 252d and the lower holding surface 230d is a direction in which the upper holding surface 252d and the lower holding surface 230d sandwich the diaphragm 251.

  Thus, since the lower surface side contact surface 53 is inclined, when the inner peripheral edge 251b is sandwiched between the upper holding surface 252d and the lower holding surface 230d, the first portion 50 falls to the upper holding surface 252d side. Thereby, as shown in FIG. 13, the second surface 52 contacts the upper holding surface 252d, and the end portion 41 of the barrier film 40 contacts the upper holding surface 252d.

  As shown in FIG. 13, the second part 60 is located closer to the enclosed space 252 a than the first part 50. In the second portion 60, the surface layer of the contact surface that contacts the upper holding surface 252 d is configured by the rubber main body 30. In the second portion 60, in a state where the inner peripheral edge 251b is sandwiched and held between the lower holding surface 230d and the upper holding surface 252d, the diaphragm is utilized by utilizing the elasticity of at least the rubber body 30 that contacts the upper holding surface 252d. The gap between 251 and the upper holding surface 252d is filled and sealed. Thus, the 2nd site | part 60 is a site | part which functions as an interface leak suppression part which suppresses the interface leak of a temperature sensitive medium.

  In the natural state shown in FIG. 12, the second portion 60 has a protruding portion 61 that protrudes toward the lower holding surface 230 d on the lower surface 73 of the inner peripheral edge portion 251 b at a position away from the first portion 50. Yes. Thereby, the contact surface pressure of the 2nd site | part 60 with respect to the upper side holding surface 252d can be enlarged in the pinched state shown in FIG.

  The diaphragm 251 having such a configuration is molded by preforming. For example, an upper mold and a lower mold having the same cavity as the outer shape of the diaphragm 251 are prepared. Then, in the upper mold, the first rubber layer 31 having the shape shown in FIG. 10 is molded in advance as a preform of unvulcanized rubber. Similarly, in the lower mold, the second rubber layer 32 having the shape shown in FIG. 10 is molded in advance as a preform of unvulcanized rubber. The first rubber layer 31 is a portion above the barrier film 40 in the rubber main body 30. The second rubber layer 32 is a portion below the barrier film 40 in the rubber main body 30. 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.

  As described above, in the present embodiment, in the inner peripheral edge 251b and the outer peripheral edge 251c of the diaphragm 251, the first portion 50 where the barrier film 40 is in contact with the upper holding surface 251d and the rubber main body 30 are held upward. The second portion 60 that is in contact with the surface 251d is separated.

  According to this, in the 1st site | part 50, since the barrier film 40 is contacting the upper side holding surface 251d, permeation | transmission of the diaphragm 251 of a temperature sensitive medium can be suppressed. Since the second portion 60 is away from the portion where the barrier film 40 is exposed, the rubber body 30 is compressed without being affected by the tension of the barrier film 40. For this reason, compared with the diaphragm J251 of the examination example, the contact surface pressure of the diaphragm 251 can be increased, and the seal surface pressure can be secured.

  Therefore, according to the present embodiment, it is possible to achieve both interface leakage suppression and permeation suppression of the temperature-sensitive medium at the inner peripheral edge 251b and the outer peripheral edge 251c of the diaphragm 251.

  In the present embodiment, the upper surface side contact surfaces 51 and 52 of the first part 50 are bent so that the second surface 52 is positioned closer to the lower surface 73 side of the diaphragm 251 than the first surface 51 in the natural state. Yes. On the second surface 52, the end 41 of the barrier film 40 is exposed from the rubber body 30. The lower surface side contact surface 53 of the first part 50 is inclined with respect to the first surface 51 so as to be separated from the first surface 51 as it is separated from the enclosed space 252a in a natural state.

  According to this, when the inner peripheral edge portion 251b and the outer peripheral edge portion 251c are sandwiched between the upper holding surface 252d and the lower holding surface 230d, the first portion 50 falls to the upper holding surface 252d side, so that the barrier film 40 The end portion 41 contacts the upper holding surface 252d. For this reason, when the diaphragm 251 is molded, the shape of the barrier film 40 inside the inner peripheral edge 251b and the outer peripheral edge 251c does not have to be bent in advance toward the upper holding surface 252d. Therefore, the above-described diaphragm 251 can be easily molded.

(Second Embodiment)
As shown in FIGS. 14 and 15, the present embodiment is obtained by changing the structure of the inner peripheral edge 251 b and the outer peripheral edge 251 c of the diaphragm 251 with respect to the first embodiment. The same as in the first embodiment. 14 and 15 correspond to FIGS. 12 and 13, respectively.

  As shown in FIG. 14, in the present embodiment, the second portion 60 has a protruding portion 62 that protrudes toward the upper holding surface 252 d on the upper surface 72. The surface layer of the protruding tip surface 63 of the protruding portion 62 is constituted by the rubber main body 30. As shown in FIG. 15, the protruding tip surface 63 contacts the upper holding surface 252d. For this reason, in the 2nd site | part 60, the rubber main body 30 is contacting the upper side holding surface 252d.

  As described above, the second portion 60 may have a shape having the protrusion 62 on the upper surface 72. Also by this, the same effect as the first embodiment can be obtained.

  The second portion 60 may have a shape having protrusions 61 and 62 on both the upper surface 72 and the lower surface 73. In short, the second portion 60 may have a shape having a protrusion on at least one of the upper surface 72 and the lower surface 73.

(Third embodiment)
As shown in FIGS. 16 and 17, the present embodiment is obtained by changing the structure of the inner peripheral edge 251b and the outer peripheral edge 251c of the diaphragm 251 with respect to the first embodiment. The same as in the first embodiment. 16 and 17 correspond to FIGS. 12 and 13, respectively.

  In the present embodiment, as shown in FIG. 16, the first portion 50 has a protruding portion 54 that protrudes toward the upper holding surface 232 d on the upper surface 72 that is on the upper holding surface 232 d side when being held. Have. Inside the first portion 50, the barrier film 40 extends toward the protruding tip surface 55 of the protruding portion 54. At the protruding tip surface 55, the end portion 41 of the barrier film 40 is exposed. As shown in FIG. 17, the protruding tip surface 55 contacts the upper holding surface 252d. For this reason, in the 1st site | part 50, the edge part 41 of the barrier film | membrane 40 is contacting the upper side holding surface 252d.

  As shown in FIG. 16, the second portion 60 has a protruding portion 62 that protrudes toward the upper holding surface 232 d side on the upper surface 72 as in the second embodiment. The surface layer of the protruding tip surface 63 of the protruding portion 62 is constituted by the rubber main body 30. As shown in FIG. 17, the protruding tip surface 63 comes into contact with the upper holding surface 252d. For this reason, in the 2nd site | part 60, the rubber main body 30 is contacting the upper side holding surface 252d. Further, in the present embodiment, in order to increase the surface pressure of the second portion 60 with respect to the upper holding surface 252d, the protrusion height of the protrusion 62 of the second portion 60 is set to the first portion in the natural state shown in FIG. The protrusion height of 50 protrusions 54 is set higher.

  Also in this embodiment, the same effect as the first embodiment can be obtained.

(Fourth embodiment)
As shown in FIGS. 18 and 19, the present embodiment is obtained by changing the structure of the inner peripheral edge 251b and the outer peripheral edge 251c of the diaphragm 251 with respect to the first embodiment. The same as in the first embodiment. 18 and 19 correspond to FIGS. 12 and 13, respectively.

  In the present embodiment, the positions of the first part 50 and the second part 60 are interchanged with respect to the third embodiment. That is, the second part 60 is located on the side farther from the enclosed space 252a than the first part 50. Even if it does in this way, the effect similar to 1st Embodiment is acquired.

(Fifth embodiment)
As shown in FIGS. 20, 21, and 22, the present embodiment is obtained by changing the structure of the diaphragm 251 and the upper holding surface 252 d with respect to the first embodiment, and the other configurations are the first embodiment. Is the same.

  As shown in FIG. 20, in the present embodiment, an inner peripheral rubber member 81 is provided in a part of the upper holding surface 252d facing the inner peripheral edge 251b, and the upper holding surface 252d An outer peripheral rubber member 82 is provided at a part of the portion facing the outer peripheral edge 251c.

  Specifically, as shown in FIGS. 21 and 22, an installation groove 252e is formed in a part of the upper holding surface 252d facing the inner peripheral edge 251b. The installation groove 252e is a rubber holding portion that holds the inner peripheral rubber member 81, and the inner peripheral rubber member 81 is held in the installation groove 252e. The same applies to the holding structure of the outer peripheral rubber member 82 of the upper holding surface 252d.

  The planar shape of the inner peripheral rubber member 81 is an annular shape along the circumferential direction of the inner peripheral edge 251b. The planar shape of the outer peripheral rubber member 82 is an annular shape along the circumferential direction of the outer peripheral edge portion 251c.

  As shown in FIG. 20, the diaphragm 251 has a structure in which the barrier film 40 is laminated on the sealed space 252 a side with respect to the rubber main body 30. That is, the barrier film 40 is located on the surface 72 of the diaphragm 251 on the side of the enclosed space 252a. The barrier film 40 is disposed over the entire pressure receiving portion 251a and extends from the pressure receiving portion 251a to both the inner peripheral edge portion 251b and the outer peripheral edge portion 251c. Therefore, the barrier film 40 is located on the surface 72 of the inner peripheral edge 251b and the outer peripheral edge 251c on the sealed space 252a side.

  The inner peripheral rubber member 81 is sandwiched between the upper holding surface 252d and the inner peripheral edge 251b, and the inner peripheral edge 251b is in the upper side with the barrier film 40 in contact with the upper holding surface 252d. It is sandwiched and held between the holding surface 252d and the lower holding surface 230d. Similarly, the outer peripheral rubber member 82 is sandwiched between the upper holding surface 252d and the outer peripheral edge 251c, and the outer peripheral edge 251c is in the upper side with the barrier film 40 in contact with the upper holding surface 252d. It is sandwiched and held between the holding surface 252d and the lower holding surface 230d.

  Thus, in this embodiment, since the inner peripheral side rubber member 81 and the outer peripheral side rubber member 82 which are separate from the diaphragm 251 are used, the inner peripheral side rubber member 81 and the outer peripheral side rubber member 82 are barriers. The film is compressed without being affected by the tension of the film 40. For this reason, according to this embodiment, compared with the diaphragm J251 of the examination example, the contact surface pressures of the inner peripheral side rubber member 81 and the outer peripheral side rubber member 82 with respect to the upper holding surface 252d can be increased. Can be secured.

  Furthermore, in the present embodiment, as shown in FIG. 22, the portion of the inner peripheral edge 251 b where the barrier film 40 faces the upper holding surface 252 d without the inner peripheral rubber member 81 is the surface 42 of the barrier film 40. Is in contact with the upper holding surface 252d. Similarly, the portion of the outer peripheral edge 251c where the barrier film 40 faces the upper holding surface 252d without the outer peripheral rubber member 82 is in a state where the surface 42 of the barrier film 40 is in contact with the upper holding surface 252d. For this reason, permeation | transmission of the diaphragm 251 of a temperature sensitive medium can be prevented.

  Therefore, also in this embodiment, there exists an effect similar to 1st 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 and second embodiments, the end portion 41 of the barrier film 40 is exposed from the rubber body 30 in the first portion 50, but portions other than the end portion of the barrier film 40 are exposed from the rubber body 30. It may be exposed.

  (2) In each of the above embodiments, the lid member 252b is made of a metal material, and the barrier film 40 is made of a synthetic resin. However, the lid member 252b and the barrier film 40 are more sensitive to temperature than the rubber body 30. You may be comprised with the other material with low transmittance | permeability.

  (3) In each of the above embodiments, the diaphragm 251 has the rubber body 30 and the barrier film 40, but may have a reinforcing member. Examples of the reinforcing member include a base fabric configured as a fabric of synthetic resin fibers such as polyester.

  (4) In each of the above embodiments, the diaphragm 251 is annular, but other shapes may be used as long as it is annular.

  (5) In each of the above embodiments, the diffuser body 230 and the lid member 252b hold and hold the diaphragm 251 and constitute an enclosed space forming portion that forms the enclosed space 252a on one surface side of the diaphragm 251. A member separate from the diffuser body 230 may constitute the enclosed space forming portion. That is, the portion provided with the lower holding surface 230d may be formed of a member separate from the diffuser body 230.

  (6) In each of the above embodiments, the swirl space 221 is formed in the body 220a of the nozzle body 220, but the swirl space 221 may not be formed. In this case, the refrigerant flowing from the refrigerant inlet 211 flows into the decompression space 222.

  (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 embodiments, the example in which the elements constituting the body 200, the passage forming member 240, and the like are made of a metal material has been described. However, the present invention is not limited to this. Each component may be made of a material other than a metal material (for example, resin) as long as pressure resistance, heat resistance, and the like are not problematic.

  (9) In each of the above 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 to this example. Alternatively, the ejector 100 of the present invention may be applied.

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

  (11) 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.

  (12) In each of the above-described embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, the specific number is clearly specified when clearly indicated as essential. It is not limited to the specific number except when limited to.

  (13) In each of the above-described embodiments, when referring to the shape, positional relationship, etc. of the constituent elements, etc., unless specifically stated or limited in principle to a specific shape, positional relationship, etc. It is not limited to shape, positional relationship, and the like.

30 Rubber body 40 Barrier film 50 First part 60 Second part 230d Lower holding surface 251 Diaphragm 251a Diaphragm pressure receiving part 251b Diaphragm inner peripheral part 251c Diaphragm outer peripheral part 252a Temperature-sensitive medium enclosed space 252b Upper cover 252d Holding surface

Claims (4)

An ejector applied to a vapor compression refrigeration cycle (10),
A decompression space (222) for decompressing the refrigerant flowing in from the refrigerant inlet (211), a suction passage (231) communicating with the refrigerant flow downstream side of the decompression space and sucking the coolant from the outside, and the decompression space A body (200) having a pressurizing space (232) formed by mixing and injecting the refrigerant injected from the space and the refrigerant sucked from the suction passage;
Refrigerant that has flowed from the refrigerant inlet between at least a part of the decompression space and the pressurization space, and an inner peripheral surface of a portion of the body forming the decompression space. A nozzle passage (224) that functions as a nozzle that injects under reduced pressure and mixes the injection refrigerant and the suction refrigerant with the inner peripheral surface of a portion of the body that forms the pressurizing space. A passage forming member (240) for forming a diffuser passage (232a) functioning as a diffuser for boosting the pressure,
The body is disposed so as to surround the axis (X) of the passage forming member, and has one surface (72) on one side in the axial direction of the passage forming member, and the other on the other side in the axial direction. A diaphragm (251) having a surface (73) and having an inner peripheral edge portion (251b) and an outer peripheral edge portion (251c) as viewed from the axial direction, the ring being interlocked with the passage forming member And
The body has an enclosure space forming portion (230, 252b) that holds the diaphragm and forms an enclosure space (252a) that encloses a temperature sensitive medium on one surface side of the diaphragm.
The temperature of the suction refrigerant flowing through the suction passage is transmitted to the temperature-sensitive medium in the enclosed space, and the pressure of the temperature-sensitive medium changes according to the temperature change of the suction refrigerant. In addition, the temperature sensitive medium is enclosed,
The enclosed space forming portion includes a first holding surface (252d) in contact with the one surface of each of the inner peripheral edge portion and the outer peripheral edge portion, and the other surfaces of the inner peripheral edge portion and the outer peripheral edge portion, respectively. A second holding surface (230d) in contact with the first holding surface and the second holding surface, sandwiching the inner peripheral edge and the outer peripheral edge,
The diaphragm has 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 disposed over the entire area of the pressure receiving portion (251a) facing the enclosed space in the diaphragm, and extends from the pressure receiving portion to both the inner peripheral edge and the outer peripheral edge,
Each of the inner peripheral edge portion and the outer peripheral edge portion includes a first portion (50) including a portion (41) where the barrier film is in contact with the first holding surface, and the rubber main body is the first holding surface. A second part (60) in contact with
In the natural state where the inner peripheral edge portion and the outer peripheral edge portion are not sandwiched between the first holding surface and the second holding surface, the second portion has the inner peripheral edge portion at a position away from the first portion. And an ejector having protrusions (61, 62) on at least one of the one surface and the other surface of the outer peripheral edge.   2. The ejector according to claim 1, wherein the first part is located on a side farther from the enclosed space than the second part. The first part has one surface side contact surface (51, 52) that contacts the first holding surface, and another surface side contact surface (53) that contacts the second holding surface,
The one-surface-side contact surface has a first surface (51) and a second surface (52) located on a side farther from the enclosed space than the first surface in the natural state, and the second surface Is bent so as to be located on the other surface side of the diaphragm from the first surface,
The other surface-side contact surface is inclined so as to be separated from the first surface as it is away from the enclosed space with respect to the first surface in the natural state.
The ejector according to claim 2, wherein the barrier film is exposed from the rubber body on the second surface. An ejector applied to a vapor compression refrigeration cycle (10),
A decompression space (222) for decompressing the refrigerant flowing in from the refrigerant inlet (211), a suction passage (231) communicating with the refrigerant flow downstream side of the decompression space and sucking the coolant from the outside, and the decompression space A body (200) having a pressurizing space (232) formed by mixing and injecting the refrigerant injected from the space and the refrigerant sucked from the suction passage;
Refrigerant that has flowed from the refrigerant inlet between at least a part of the decompression space and the pressurization space, and an inner peripheral surface of a portion of the body forming the decompression space. A nozzle passage (224) that functions as a nozzle that injects under reduced pressure and mixes the injection refrigerant and the suction refrigerant with the inner peripheral surface of a portion of the body that forms the pressurizing space. A passage forming member (240) for forming a diffuser passage (232a) functioning as a diffuser for boosting the pressure,
The body is disposed so as to surround the axis (X) of the passage forming member, and has one surface (72) on one side in the axial direction of the passage forming member, and the other on the other side in the axial direction. A diaphragm (251) having a surface (73) and having an inner peripheral edge portion (251b) and an outer peripheral edge portion (251c) as viewed from the axial direction, the ring being interlocked with the passage forming member And
The body has an enclosure space forming portion (230, 252b) that holds the diaphragm and forms an enclosure space (252a) that encloses a temperature sensitive medium on one surface side of the diaphragm.
The temperature of the suction refrigerant flowing through the suction passage is transmitted to the temperature-sensitive medium in the enclosed space, and the pressure of the temperature-sensitive medium changes according to the temperature change of the suction refrigerant. In addition, the temperature sensitive medium is enclosed,
The enclosed space forming portion includes a first holding surface (252d) in contact with the one surface side of each of the inner peripheral edge portion and the outer peripheral edge portion, and each of the other of the inner peripheral edge portion and the outer peripheral edge portion. A second holding surface (230d) in contact with the surface side, the first holding surface and the second holding surface are held across the inner peripheral edge and the outer peripheral edge,
An annular inner peripheral rubber member (81) along the circumferential direction of the inner peripheral edge is provided on a portion of the first holding surface facing the inner peripheral edge, and the first holding surface An annular outer peripheral rubber member (82) along the circumferential direction of the outer peripheral edge is provided on a part of the surface facing the outer peripheral edge,
The diaphragm has 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 disposed over the entire area of the pressure receiving portion (251a) facing the sealed space in the one surface of the diaphragm, and both the inner peripheral edge and the outer peripheral edge from the pressure receiving portion. Extending to
The inner peripheral edge is held in a state where the inner peripheral rubber member is sandwiched between the first holding surface and the inner peripheral edge, and the barrier film is in contact with the first holding surface. Has been
The outer peripheral edge is held in a state in which the outer peripheral rubber member is sandwiched between the first holding surface and the outer peripheral edge, and the barrier film is in contact with the first holding surface. Ejector characterized by that.

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