JP2010196919A - Ejector system pressure reducing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ejector type pressure reducing device suppressing energy loss and promoting mixing of liquid phase fluid with gas phase fluid in a mixing part. <P>SOLUTION: An ejector device 4 includes: a nozzle 410; a suction port 416 from which an external gas refrigerant is sucked by suction force of a liquid refrigerant blown out of a blowout port 415 of the nozzle 410; the mixing part 42 constituting a passage provided on the downstream side of the blowout port 415 and mixing the liquid refrigerant blown out from the blowout port 415 with the gas refrigerant sucked from the suction port 416; a diffuser part 43 serving as a passage downstream of the mixing part 42 and increasing pressure by reducing the speed of the flowing refrigerant; and a porous mesh member 422 provided at least in the central part of a passage cross sectional face constituting the mixing part 42 and having a large number of communication holes 423 for communicating the upstream side with the downstream side of the passage of the mixing part 42. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ejector-type decompression device that is a decompression unit that decompresses a fluid and is a momentum transporting pump that transports fluid by the entrainment action of a working fluid ejected at high speed.

  The liquid refrigerant ejected from the nozzle in the ejector-type decompression device has a non-uniform droplet size, and due to the inertial force characteristic of the droplet, the particle size is large near the central axis of the passage of the mixing section. There is a tendency that droplets are distributed and droplets having a small particle diameter that are likely to diffuse near the tube wall. On the other hand, since the gas refrigerant sucked from the suction port tends to flow near the tube wall in the mixing section, it is easy to mix with droplets having a small particle size, but sufficiently mix with droplets having a large particle size. Therefore, the liquid refrigerant and the gas refrigerant are not uniformly mixed in the mixing unit.

  Therefore, the conventional ejector-type decompression device described in Patent Document 1 is a mixing unit that uniformly mixes the liquid refrigerant ejected from the nozzle outlet and the gas refrigerant sucked from the suction opening. A swirler or needle valve disposed in the center is provided (for example, see Patent Document 1).

  In this decompression device, the refrigerant droplets ejected from the nozzle outlet collide with the swirler or needle valve, and are diffused and refined toward the tube wall in the mixing unit, and mixed with the gas refrigerant sucked from the suction port. To come. The efficiency of the ejector is improved by mixing the liquid refrigerant and the gas refrigerant in the mixing section.

JP-A-6-2964

  However, in the conventional pressure reducing device, a droplet having a large particle size collides with a swirler or a needle valve provided in the passage of the mixing unit and diffuses to the tube wall side, so that the flow direction of the droplet changes greatly. In this method, there is a problem that energy loss due to a large change in the flow of the liquid refrigerant, energy loss due to collision of a droplet whose flow direction has been changed with the tube wall, and the like are large. Further, since the droplet is miniaturized by collision, there is a problem that the droplet is not sufficiently miniaturized in the mixing portion. Therefore, there is room for further improvement in the efficiency of the ejector.

  The present invention has been made in view of the above problems, and an object thereof is to provide an ejector-type decompression device that suppresses energy loss and promotes mixing of a liquid phase fluid and a gas phase fluid in a mixing section. And

  In order to achieve the above object, the following technical means are adopted. In addition, the code | symbol in the parenthesis as described in a claim and each means of the following shows the correspondence with the specific means as described in embodiment mentioned later as one aspect.

That is, the invention relating to the ejector-type decompression device according to claim 1 is characterized in that the suction force by the nozzle (410) that decompresses and expands the inflowing fluid and the liquid phase fluid ejected from the nozzle outlet (415). The suction port (416) through which the phase fluid is sucked and a passage provided on the downstream side of the nozzle outlet, and mixes the liquid phase fluid ejected from the nozzle and the gas phase fluid sucked from the suction port. A mixing section (42) constituting the passage, a passage provided on the downstream side of the mixing section, a diffuser section (43) for decelerating the flowing fluid and increasing the pressure, and a passage cross section constituting the mixing section A porous member (422) having a plurality of communication holes (423) that are provided at least in the central portion of the mixing portion and communicate with the upstream side and the downstream side of the passage of the mixing unit,
The liquid phase fluid flowing through the passage of the mixing part is characterized by being subdivided when passing through the communicating hole of the porous member.

  Regarding the liquid phase fluid ejected from the nozzle to the mixing section, the size of the liquid droplet flowing near the center of the passage cross section is different from that of the liquid droplet flowing near the passage wall surface of the mixing section, and the former is larger. There is a tendency. Therefore, according to the present invention, the liquid phase fluid ejected from the nozzle to the mixing portion is passed through the porous member, so that the particle size is reduced when passing through the communication hole, and can be subdivided. Since the subdivided liquid phase fluid is mixed with the gas phase fluid sucked from the suction port, the liquid phase fluid and the gas phase fluid in the mixing section are uniformly mixed, and the efficiency of the ejector is improved. become. According to this, energy loss due to a large change in the flow direction of the liquid phase fluid can be avoided, and since the flow is not directed to the passage wall side of the mixing unit, energy loss due to collision can also be avoided, so the loss is small. Sufficient ejector efficiency can be improved. Accordingly, an ejector-type decompression device that suppresses energy loss and promotes mixing of the liquid-phase fluid and the gas-phase fluid in the mixing section can be obtained.

  According to a second aspect of the present invention, in the first aspect of the present invention, the porous member is composed of a mesh-like mesh member. According to this invention, a porous member having a large number of communication holes can be easily produced, and a porous member useful in terms of the structure and cost of the member can be provided. Furthermore, since a large number of communication holes are obtained by a mesh structure, the thickness of the porous member in the direction of the passage axis can be reduced, and passage resistance given to the fluid can be reduced.

The invention according to claim 3 is the invention according to claim 2, wherein the mesh portion of the mesh member is provided in a central portion of the passage cross section constituting the mixing portion,
Between the pipe wall surface (421) forming the mixing portion and the mesh portion of the mesh member, a support member (424) for supporting the mesh portion is provided, and a passage through which fluid flows is formed. And

  According to the present invention, since the support member and the passage are provided between the tube wall surface and the mesh portion of the mixing portion, the fluid with large droplets flowing near the center of the passage cross section is subdivided at the mesh portion. Thus, the fluid with small droplets flowing near the tube wall flows through the channel near the tube wall without being obstructed by the mesh portion, and mixes with the subdivided liquid phase fluid on the downstream side. Thereby, it is possible to provide an ejector-type decompression device capable of subdividing the liquid phase fluid while suppressing passage resistance.

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the support member is formed of a mesh-like member obtained by extending a mesh portion provided at the center of the cross section of the passage. According to this invention, the mesh portion at the center of the passage cross section and the support member are formed by the continuous mesh portion. Thereby, processing (for example, welding, brazing joining, etc.) for joining the mesh portion and the support portion, the number of parts, and the like can be reduced, and productivity can be improved.

It is the schematic diagram which showed an example of the vapor compression refrigeration cycle in which the ejector apparatus of 1st Embodiment is used. It is typical sectional drawing which showed the structure of the ejector apparatus of 1st Embodiment. It is the front view which showed the 1st example of the porous member used for the ejector apparatus of 1st Embodiment. It is the front view which showed the 2nd example of the porous member of 1st Embodiment. It is the front view which showed the 3rd example of the porous member of 1st Embodiment.

(First embodiment)
1st Embodiment which is one Embodiment of this invention is described using FIGS. 1-5. FIG. 1 shows an example of a vapor compression refrigeration cycle provided with an ejector-type decompression device (ejector device 4). The vapor compression refrigeration cycle 1 includes a compressor 2, a radiator 3 that radiates heat of the high-pressure refrigerant discharged from the compressor 2, and a decompression device that decompresses and expands the high-pressure refrigerant downstream of the radiator 3. And an ejector device 4 for exchanging heat between the air and the liquid phase refrigerant, and a gas-liquid separator 5 for separating the refrigerant into a gas phase refrigerant and a liquid phase refrigerant. In the present embodiment, for example, carbon dioxide (refrigerant) is used as the fluid circulating in the cycle, and the high-pressure refrigerant discharged from the compressor 2 has a critical pressure or higher. The arrows in FIG. 1 indicate the flow of the refrigerant in the cycle.

  The compressor 2 is driven by an electric motor to suck, compress, and discharge the refrigerant, and can variably control the discharge refrigerant temperature or the discharge refrigerant pressure to be a predetermined value. The compressor 2 is driven by a vehicle running engine via an electromagnetic clutch and a belt, for example, a swash plate type variable displacement compressor capable of continuously variably controlling the discharge capacity by an external control signal. It may be configured.

  The radiator 3 is a heat exchanger that cools the high-pressure refrigerant by exchanging heat between the high-pressure refrigerant discharged from the compressor 2 and outside air that is forcibly blown by a blower (not shown). For example, when the radiator 3 is used for a hot water heater, the radiator 3 is a water / refrigerant heat exchanger, and hot water is supplied by exchanging heat between the high-pressure refrigerant discharged from the compressor 2 and hot water. It is heated and the refrigerant is cooled.

  The ejector device 4 sucks the gas-phase refrigerant evaporated by the evaporator 7 by decompressing and expanding the refrigerant flowing through the refrigerant passage 8 connected to the radiator 3, and converts the expansion energy into pressure energy. Thus, the suction pressure of the compressor 2 is increased.

  The gas-liquid separator 5 is a separating unit that separates the refrigerant flowing out from the ejector device 4 into a gas-phase refrigerant and a liquid-phase refrigerant and stores the refrigerant. The gas-phase refrigerant part of the gas-liquid separator 5 in which the gas refrigerant is stored is connected to the suction side of the compressor 2, and the liquid-phase refrigerant part of the gas-liquid separator 5 in which the liquid refrigerant is stored is connected to the evaporator 7. A fixed throttle unit 6 is provided between the liquid-phase refrigerant unit and the evaporator 7 so that the liquid-phase refrigerant flowing out of the gas-liquid separator 5 is decompressed and then flows into the evaporator 7.

  Next, as an example of an ejector-type decompression device, an ejector device 4 installed with its axial direction aligned with the horizontal direction will be described in detail with reference to FIGS. FIG. 2 is a schematic cross-sectional view showing the internal configuration of the ejector device 4. As shown in FIG. 2, the ejector device 4 includes a suction unit 41, a mixing unit 42, and a diffuser unit 43 (a boosting unit). The suction part 41 includes a nozzle 410 that decompresses and expands the refrigerant that has flowed in, a suction port 416 that is formed in the body 40 and from which an external gas refrigerant is sucked by the suction force of the liquid refrigerant that is ejected from the ejection port 415 of the nozzle 410. , And is a portion disposed on one side of the body 40 of the ejector device 4.

  The mixing portion 42 is a portion disposed in the central portion of the body 40 in the axial direction, and is a passage provided on the downstream side of the ejection port 415 of the nozzle 410, and the liquid refrigerant ejected from the nozzle 410 and the suction port 416. A passage for mixing with the gas refrigerant sucked from is constituted. The mixing unit 42 is also a flow path provided on the downstream side of the suction port 416, and a high-speed refrigerant flow from the nozzle 410 and the refrigerant sucked from the suction port 416 are mixed, and the diffuser unit 43 is further downstream. Connected with.

  The diffuser portion 43 is a portion disposed on the other side of the body 40, and is formed in a shape in which the passage cross-sectional area gradually increases, and acts to decelerate the refrigerant flow and increase the refrigerant pressure, that is, the refrigerant It has the function of converting velocity energy into pressure energy. The mixing unit 42 and the diffuser unit 43 can also be collectively referred to as a boosting unit. The outlet 431 on the downstream side of the diffuser portion 43 is connected to a gas phase refrigerant portion of the gas-liquid separator 5 disposed on the downstream side in the refrigerant flow direction via a refrigerant pipe.

  The suction port 416 of the suction unit 41 is arranged by shifting the introduction direction of the low-pressure refrigerant from the evaporator 7 with respect to the axis of the nozzle 410, and the refrigerant flows in a direction substantially orthogonal to the axis of the nozzle 410. It is provided in the body 40 so that it may do. The low-pressure refrigerant is sucked into the suction port 416 by the refrigerant ejected from the nozzle outlet 415 of the nozzle 410 and flows into the passage 417 formed between the outer periphery of the nozzle 410 and along the inner peripheral surface of the body 40. Thus, it is introduced around the nozzle 410. The refrigerant that has flowed into the body 40 from the suction port 416 flows down toward the axial center of the mixing unit 42 while turning in a circular arc along the inner peripheral surface of the body 40.

  The inlet 410 of the nozzle 410 is connected to a high-pressure side refrigerant pipe that forms a refrigerant passage 8 for taking in the refrigerant that has flowed out of the radiator 3. The suction port 416 of the body 40 is connected to a low-pressure side refrigerant pipe that forms a refrigerant passage 9 for taking in the refrigerant that has flowed out of the evaporator 7.

  The nozzle 410 includes an inlet 411, a narrowed passage 412 whose passage sectional area gradually narrows from the inlet 411, and a small diameter passage 413 (hereinafter referred to as a throat) that forms a constant passage sectional area from the downstream end of the narrowed passage 412. An expansion passage 414 formed so that the passage cross-sectional area gradually increases from the small-diameter passage 413 toward the downstream side, and the most downstream end portion of the nozzle 410 and the exit of the expansion passage 414. A spout 415. The high-pressure refrigerant that has flowed into the inlet 411 through the refrigerant passage 8 advances in the axial direction of the nozzle 410 and flows in order through the narrowing passage 412, the small-diameter passage 413, and the expansion passage 414, and isentropically decompressed and expanded.

  Thus, in the ejector device 4, the pressure at the inlet of the nozzle 410 is rapidly decompressed and expanded in the nozzle 410, and the refrigerant has the lowest pressure at the outlet of the nozzle 410. Then, the liquid refrigerant jetted from the nozzle 415 of the nozzle 410 is mixed with the gas refrigerant sucked from the suction port 416 in the mixing unit 42, whereby the pressure rises gently, and further the deceleration in the diffuser unit 43. To rise.

  When the refrigerant that has flowed out of the throat 413 of the nozzle 410 flows through the spreading passage 414, the droplets have a non-uniform distribution. Due to the characteristics of the inertial force of the liquid droplets, there is a liquid refrigerant X2 having a large particle size near the central axis of the passage of the mixing unit 42, and a liquid refrigerant X1 having a particle diameter smaller than that of the liquid refrigerant X2 is near the tube wall surface 421. Already diffuse and exist. Since the gas refrigerant sucked from the suction port 416 flows near the tube wall surface 421, it is mixed with the liquid refrigerant X1, but is difficult to mix with the liquid refrigerant X2, and the liquid refrigerant and the gas refrigerant are mixed in the mixing unit 42. Are not mixed uniformly, and the efficiency of the ejector cannot be secured sufficiently.

  Therefore, in this embodiment, as shown in FIGS. 2 and 3, a mesh member 422, which is a first example of a porous member, is provided in a passage constituting the mixing unit 42. FIG. 3 is a front view showing a first example of a porous member used in the ejector device 4, and is a view of the III-III cut surface of FIG. In FIG. 3, for ease of viewing, the diffuser portion 43 is not shown, and only the mixing portion 42 is shown.

  The mesh member 422 is an example of a porous member having a large number of communication holes 423 in which the upstream side and the downstream side of the passage of the mixing unit 42 communicate with each other, and a liquid phase fluid subdividing means for reducing the particle size of the liquid refrigerant passing therethrough. It is. The mesh member 422 is provided at least in the central portion of the cross section of the passage of the mixing unit 42, and when the liquid refrigerant passes through the many communication holes 423, the mesh member 422 is subdivided into a particle size smaller than the particle size before passing, And has a function of changing to a state in which it is easily mixed with the gas refrigerant.

  The mesh portion of the mesh member 422 is provided at the center portion of the passage cross section of the mixing portion 42. Between the pipe wall surface 421 forming the mixing portion 42 and the mesh portion, three support members 424 that support the mesh portion are provided, and a passage through which a gas refrigerant or the like flows without resistance is formed. Since the mesh portion is supported by the support member 424 fixed to the tube wall surface 421, the mesh portion is held at a predetermined position in the passage of the mixing unit 42. For this reason, three gaps are formed between the circular mesh portion and the support member 424 and the tube wall surface 421, and a relatively large particle size that has already diffused in these three gaps and flows near the tube wall surface 421. Small liquid refrigerant X1 and gas refrigerant pass through. Then, the liquid refrigerant X1 and the gas refrigerant are mixed with the liquid refrigerant X3 subdivided into a size corresponding to the mesh size of the mesh portion in the mixing unit 42 on the downstream side of the mesh member 422, and the liquid refrigerant and the gas refrigerant are mixed. Are mixed uniformly.

  Further, when the mesh portion is formed of metal, the support member 424 is also formed of the same metal, and the joint portion between them and the joint portion between the pipe wall surface 421 and the support member 424 are brazed and welded. (TIG welding, arc welding, spot welding, etc.), fixed by caulking or the like. Since the mesh portion of the mesh member 422 is formed by weaving a wire in a mesh shape, a large number of communication holes 423 can be formed, and the aperture ratio can be increased with respect to the area extending over the passage. Further, since the size of one communication hole 423 can be set in a wide range, it is easy to set the mesh size of the mesh portion so that the size of the droplet to be subdivided can be obtained. In addition, the mesh portion may be formed of a stainless steel material such as SUS304, SUS316, SUS310, or the like, and a mesh structure having an opening in the range of 300 mesh to 400 mesh may be employed.

  Further, the porous member may have a form as in the second example shown in FIG. As shown in FIG. 4, the porous member of the second example has a configuration in which four support members 424 extend radially around the mesh portion. Further, the number of support members 424 may be five or more. If the number of the support members 424 is increased, the mesh portion can be supported more stably, the surface area of the support member 424 per piece can be reduced, and the flow of refrigerant around the mesh portion is uneven. Can be avoided.

  A third example of the porous member will be described with reference to FIG. FIG. 5 is a front view showing a mesh member 422A which is a third example of the porous member. As shown in FIG. 5, the support member that supports the mesh portion at the center of the passage cross section is configured by a mesh member that extends the mesh portion as it is. That is, the mesh portion provided at the center of the cross section of the passage of the mixing portion 42 has a triangular shape, and the apex portion of the triangular mesh portion extends radially to the tube wall surface 421 to constitute a support member. . Since the support member is composed of a mesh-like member, the refrigerant passing through the support portion can be subdivided into small droplets. Three gaps are formed between the triangular mesh portion and the tube wall surface 421. Similar to the first example described above, the liquid refrigerant X1 and the gas refrigerant having a relatively small particle size flowing near the tube wall surface 421 pass through the three gaps in the third example. Then, the liquid refrigerant X1 and the gas refrigerant are mixed with the liquid refrigerant X3 subdivided into a size corresponding to the mesh size of the mesh portion in the mixing section 42 on the downstream side of the mesh member 422A, and the liquid refrigerant and the gas refrigerant are mixed. Are mixed uniformly.

  Next, the operation of the vapor compression refrigeration cycle 1 in the above configuration will be described. When a control device (not shown) energizes the electromagnetic clutch of the compressor 2, the electromagnetic clutch is in a connected state, and a rotational driving force is transmitted to the compressor 2 from, for example, a vehicle travel engine. When the compressor 2 is activated, the gas-phase refrigerant is sucked into the compressor 2 from the gas-phase refrigerant portion of the gas-liquid separator 5, and the compressed refrigerant is discharged toward the radiator 3. The high-pressure refrigerant discharged from the compressor 2 flows into the radiator 3 where heat is exchanged with the outdoor air to be radiated and cooled. The cooled refrigerant flows into the ejector device 4 from the inlet 411 of the nozzle 410.

  The refrigerant flowing into the ejector device 4 is decompressed isentropically by the nozzle 410 and expands. Therefore, the pressure energy of the refrigerant is converted into velocity energy by the nozzle 410, and the liquid refrigerant is ejected from the nozzle outlet 415 of the nozzle 410 at a high velocity. At this time, the gas refrigerant (low-pressure refrigerant) is sucked from the evaporator 7 to the suction port 416 by the refrigerant suction action of the refrigerant flow ejected at a high speed.

  The liquid refrigerant ejected from the nozzle 410 passes through the mesh member 422 (porous member) in the mixing unit 42 and is subdivided, and then uniformly mixed with the gas refrigerant sucked into the suction port 416 on the downstream side of the mesh member 422. Then, it flows into the diffuser part 43. In the diffuser portion 43, the refrigerant pressure is increased because the velocity (expansion) energy of the refrigerant is converted into pressure energy due to the expansion of the passage area.

  Then, the refrigerant that has flowed out from the outlet 431 of the diffuser portion 43 flows into the gas-liquid separator 5. The gas-phase refrigerant separated in the gas-liquid separator 5 is sucked into the compressor 2 and recompressed. On the other hand, the liquid-phase refrigerant separated by the gas-liquid separator 5 is decompressed by the throttle unit 6 and then flows into the evaporator 7 to evaporate by exchanging heat with the room air to cool the room air.

  The effect which the ejector apparatus 4 of this embodiment brings is described. The ejector device 4 includes a nozzle 410, a suction port 416 through which external gas refrigerant is sucked by the suction force of the liquid refrigerant jetted from the jet port 415 of the nozzle 410, and a passage provided on the downstream side of the jet port 415. A mixing portion 42 that constitutes a passage for mixing the liquid refrigerant ejected from the ejection port 415 and the gas refrigerant that is sucked from the suction port 416, and a passage that is provided on the downstream side of the mixing portion 42 and that circulates the refrigerant. A diffuser portion 43 that decelerates and increases pressure, and a plurality of communication holes 423 that are provided at least in the central portion of the cross section of the passage that constitutes the mixing portion 42 and communicate with the upstream side and the downstream side of the passage of the mixing portion 42. A mesh member 422 which is a porous member.

  According to this configuration, the liquid refrigerant flowing through the mixing section 42 is utilized by utilizing the fact that a droplet having a large particle diameter tends to flow near the center of the cross section of the passage because of its large inertia force. By passing through the communication hole of the member, it can be subdivided into small droplets having smaller particle diameters. Since the droplets subdivided by the porous member are mixed with the small-particle-size droplets that flow easily in the vicinity of the tube wall surface 421 and the gas refrigerant sucked from the suction port 416 on the downstream side, the gas phase refrigerant and the liquid phase A uniform mixed state with the refrigerant can be realized, and the efficiency of the ejector can be improved. Further, since the droplets having a large particle size do not greatly change the flow direction, and are not divided into positively colliding with the tube wall surface 421, they are subdivided, so that energy loss is small and the refrigerant in the mixing unit 42 is uniform. Can achieve a mixed state.

  Further, the porous member, which is a liquid phase fluid subdividing means, is composed of a mesh-like mesh member 422. According to this, it is possible to easily create a structure having a large number of communication holes in the porous member, and to set a wide range of aperture ratios. Further, by adjusting the wire diameter and mesh size of the wire constituting the mesh, it is possible to provide an appropriate liquid-phase fluid subdividing means corresponding to the required capacity and the use situation. Moreover, since it is a mesh structure, the thickness of the porous member in the passage axial direction can be reduced, and the resistance given to the refrigerant can be reduced.

  The mesh portion of the mesh member 422 is provided at the center of the cross section of the passage constituting the mixing portion 42, and the mesh portion is between the pipe wall surface 421 of the mixing portion 42 and the mesh portion of the mesh member 422. Is provided, and a passage through which the refrigerant flows is formed.

  According to this, since the support member 424 and the refrigerant passage are provided in the outer periphery in the radial direction of the mesh portion, the liquid refrigerant having a large liquid droplet is subdivided at the mesh portion and the liquid flowing near the tube wall surface 421. The liquid refrigerant and gas refrigerant with small droplets do not have resistance in the mesh portion, and flow smoothly through the refrigerant passage near the tube wall surface 421, and mix with the subdivided liquid refrigerant on the downstream side. In other words, the flow loss of the refrigerant can be reduced as compared with the structure in which the mesh portion is provided over the entire passage section of the mixing portion 42. For this reason, the resistance given to a refrigerant | coolant can be reduced and the ejector apparatus 4 which suppressed energy loss can be provided.

  Further, the support member 424A is configured by a mesh-like member obtained by extending a mesh portion provided at the center of the passage cross section. According to this, the support member 424A and the mesh portion at the center of the cross section of the passage become an integral mesh structure. This eliminates the need for welding, brazing and the like for joining the mesh portion and the support portion, reduces the number of parts, and improves the productivity of the ejector device 4 having the liquid phase fluid subdividing means.

(Other embodiments)
The preferred embodiments of the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit of the present invention.

  In the said embodiment, although the mesh member is employ | adopted as a porous member, it is not limited to this form. The porous member may be a member provided with a plurality of communication holes through which the refrigerant flowing through the passage of the mixing section can pass. For example, a punching metal member in which a large number of communication holes are formed, from the upstream end surface to the downstream end surface. It may be a porous body or the like provided with a large number of through holes.

  The ejector device 4 in the above embodiment can be applied to a vehicle air conditioner, a heat pump cycle for a water heater or an indoor air conditioner. Moreover, the fixed place of the ejector apparatus 4 may be a moving body such as a vehicle, or may be a fixed object placed at a fixed position.

  In the above embodiment, the type of refrigerant is carbon dioxide. However, the refrigerant can be applied to any of vapor compression type supercritical cycle and subcritical cycle such as chlorofluorocarbon refrigerant, HC refrigerant, and carbon dioxide. .

  Further, the ejector device 4 in the above embodiment may be configured to include a valve rod having a function of adjusting the passage opening degree of the nozzle 410. In this case, the ejector device 4 includes a magnet rotor that provides a driving force for displacing the valve stem in the axial direction, an actuator that includes an exciting coil and provides a rotational force to the magnet rotor, Is provided.

DESCRIPTION OF SYMBOLS 42 ... Mixing part 43 ... Diffuser part 410 ... Nozzle 415 ... Jet outlet 416 ... Suction port 421 ... Pipe wall surface 422, 422A ... Mesh member (porous member)
423 ... Communication hole 424, 424A ... Support member

Claims (4)

A nozzle (410) for decompressing and expanding the inflowing fluid;
A suction port (416) through which an external gas phase fluid is sucked by the suction force of the liquid phase fluid ejected from the nozzle outlet (415);
A mixing unit (passage provided on the downstream side of the nozzle outlet of the nozzle, and configured to mix the liquid phase fluid ejected from the nozzle and the gas phase fluid sucked from the suction port ( 42)
A passage provided on the downstream side of the mixing unit, wherein the diffuser unit (43) decelerates the circulating fluid and increases the pressure;
A porous member (422) having a plurality of communication holes (423) provided at least in a central portion of a cross section of the passage constituting the mixing portion and communicating the upstream side and the downstream side of the passage of the mixing portion;
With
The ejector-type decompression device according to claim 1, wherein the liquid-phase fluid flowing through the passage of the mixing unit is subdivided when passing through the communication hole of the porous member.   The ejector-type decompression device according to claim 1, wherein the porous member is a mesh member having a mesh portion. The mesh portion of the mesh member is provided in the center of the passage cross section constituting the mixing portion,
Between the pipe wall surface (421) forming the mixing portion and the mesh portion, a support member (424) for supporting the mesh portion is provided, and a passage through which the fluid flows is formed. The ejector-type decompression device according to claim 2.   4. The ejector-type decompression device according to claim 3, wherein the support member is configured by a mesh-like member obtained by extending the mesh portion provided in a central portion of the passage cross section.

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