JP2011080536A - Ejector device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an ejector device, capable of attaining space saving and simplification in addition to reduction in the component cost and assembling cost of a piping system in a refrigeration cycle using an ejector. <P>SOLUTION: The ejector device includes: an electric valve unit 10 for flow adjustment, which includes a valve element 24, a valve body 20 having a valve seat 22a in which an orifice 23 to be opened and closed by the valve element 24 is opened, and a lifting drive mechanism for adjusting the lift quantity of the valve element 24 to the orifice 23, the mechanism including a rotor 30, a stator 50, etc.; and an ejector unit 60 including a nozzle 71 having a fixed aperture, a mixing section 72 and a diffuser 73. The valve body 20 is extended and enlarged toward the lower side to be used also as an upper fixing section 67 in the ejector unit 60. An upper end inlet of the nozzle 71 is connected and fixed to a portion on the downstream side of the valve seat 22a in the valve body 20, whereby the electric valve unit 10 and the ejector unit 60 are integrated together. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an ejector device suitable for a refrigeration cycle using an ejector instead of an expansion valve.

  Conventionally, a general refrigeration cycle such as an air conditioner and a refrigeration apparatus is usually a compressor, a gas-liquid separator, a condenser (outdoor heat exchanger), an evaporator (indoor heat exchanger), a flow path switching valve, In the refrigeration cycle using this expansion valve, when the high-pressure refrigerant is converted into low-temperature and low-pressure steam with the expansion valve, the heat energy of the refrigerant is wasted. Therefore, it could not be said that the thermal efficiency was good. Therefore, in recent years, a refrigeration cycle using an ejector and a flow rate adjustment valve (motor valve) instead of the expansion valve has been proposed or put into practical use (see, for example, Patent Document 1 below).

  An example of a conventional refrigeration cycle is shown in FIG. The illustrated refrigeration cycle 100 serves as an alternative to an expansion valve in addition to a compressor 101, a condenser (outdoor heat exchanger) 102, an evaporator 104, a gas-liquid separator 105, and a flow path switching valve (not shown). A flow rate adjusting valve (electrically operated valve) 110 and an ejector 160 having a fixed nozzle diameter are used.

  For example, as shown in FIG. 2, the flow rate adjusting valve 110 includes a valve shaft 25 integrally provided with a valve body 24, and a valve formed with an orifice (valve port) 23 with which the valve body 24 contacts and separates. The seat body 22 is provided integrally, and the valve body 20 has a valve chamber 21 to which conduits (for example, copper joints) 41 and 42 are connected, and the can 40 whose lower end is sealed and joined to the valve body 20; A rotor 30 disposed on the inner periphery of the can 40 with a predetermined gap; a stator 50 externally fitted to the can 40 to rotationally drive the rotor 30; the rotor 30 and the valve body 24; And a screw feed mechanism that makes use of the rotation of the rotor 30 to bring the valve body 24 into and out of contact with the orifice 23. The screw feed mechanism is formed on the outer periphery of a cylindrical guide bush 26 in which a lower end portion thereof is press-fitted and fixed to the valve body 20 and a valve shaft 25 (a lower large diameter portion thereof) is slidably inserted. The fixed screw portion (male screw portion) 28 and a moving screw portion (female screw portion) 38 formed on the inner periphery of the valve shaft holder 32 and screwed into the fixed screw portion 28 are configured. A lift drive mechanism for adjusting the lift amount of the valve body 24 with respect to the orifice 23 is configured by a stepping motor, a screw feed mechanism, or the like including the rotor 30, the stator 50, etc., and the valve for the orifice 23 is configured by the lift drive mechanism. The flow rate of the refrigerant is controlled by changing the lift amount of the body 24 (for details, refer to Patent Document 2 below).

  On the other hand, the ejector 160 includes an outer cylinder 66, a cylindrical upper fixing part 67 fitted and fixed to the upper part of the outer cylinder 66, and a cylindrical lower fixed part fitted and fixed to the lower part of the outer cylinder 66. A pipe base (joint) 61 for connecting to the flow rate adjusting valve 110 is connected to the upper part of the upper fixing part 67, and the upper fixing part 67 in the outer cylinder 66 Between the lower fixing portion 68, conduits (joints) 62 and 62 for connecting to the evaporator 104 are connected.

  Further, the inner periphery of the lower end portion of the cylindrical upper fixed portion 67 is provided with an upper end inlet portion of the nozzle 71 having a constant (fixed) diameter for expanding the liquid-phase refrigerant to reduce the pressure below the evaporation pressure and accelerating it. It is fitted and fixed by caulking (67a).

  The inner peripheral surface of the cylindrical lower fixing portion 68 is formed in a funnel shape, and the lower end outlet of the nozzle 71 faces the funnel-shaped inner peripheral portion. The funnel-shaped inner peripheral portion Becomes a mixing portion 72, and a trumpet-like diffuser portion 73 is connected to a lower end portion of the mixing portion 72.

  In the refrigeration cycle 100 including the flow rate adjusting valve 110 and the ejector 160, the gas-phase (gas) refrigerant separated by the gas-liquid separator 105 is sucked into the compressor 101, where it is pressurized and sent to the condenser 102. Then, the refrigerant is condensed by exchanging heat with the external air, and the liquid phase refrigerant is sent from the condenser 102 to the ejector 160 via the flow rate adjusting valve 110. The liquid phase refrigerant expands by the nozzle 71 of the ejector 160, and is depressurized and accelerated below the evaporation pressure, and is sent to the gas-liquid separator 105 as a high-speed mist flow (hereinafter referred to as the primary flow).

  On the other hand, the liquid phase refrigerant in the gas-liquid separator 105 is mainly led to the evaporator 104 by the suction action (pump action) generated by the acceleration and expansion (decompression) of the high-pressure refrigerant in the ejector 160, where the indoor air The refrigerant evaporates by heat exchange (cooling), and the low-temperature and low-pressure gas-phase refrigerant is sucked into the ejector 160 from the evaporator 104 (the secondary flow). In the mixing section 72 in the ejector 160, the low-temperature and low-pressure gas-phase refrigerant from the evaporator 104, which is the secondary flow, is mixed with the high-speed mist flow, which is the primary flow, and the pressure is increased. The recovered refrigerant whose pressure has been increased is separated into a gas-phase refrigerant and a liquid-phase refrigerant by the gas-liquid separator 105, the gas-phase refrigerant is sucked into the compressor 101, and the liquid-phase refrigerant is sent to the evaporator 104. Circulate as before.

  In this refrigeration cycle, the expansion energy of the refrigerant is converted into pressure energy, the pressure of the refrigerant on the compressor suction side is increased, and the volumetric efficiency of the refrigerant is increased. It is possible to reduce power consumption and improve thermal efficiency.

JP 2007-255764 JP 2009-14056 A

  However, as described above, in the conventional refrigeration cycle 110 in which the flow rate adjusting valve (motorized valve) 110 and the ejector 160 are used, the flow rate adjusting valve (motorized valve) 110 and the ejector 160 are connected using a conduit or a joint. Therefore, there is a problem that the parts cost and assembly cost of the piping system are increased, and a large installation space is required.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an ejector capable of reducing the parts cost and assembly cost of the piping system in the refrigeration cycle, and saving space and simplifying the system. To provide an apparatus.

  In order to achieve the above object, an ejector device according to the present invention basically includes a valve body, a valve body having a valve seat in which an orifice opened and closed by the valve body is formed, and the valve body with respect to the orifice. The valve comprises an electric valve part for flow rate adjustment provided with a lifting / lowering drive mechanism comprising a rotor, a stator and the like for adjusting a lift amount, and an ejector part provided with a nozzle having a fixed diameter, a mixing part, and a diffuser. An upper end inlet portion of the nozzle is connected and fixed to a part of the main body downstream of the valve seat, and the electric valve portion and the ejector portion are integrated.

  In a preferred embodiment, the valve seat and the valve body are separated.

  In the ejector device according to the present invention, since the electric valve unit for flow rate adjustment and the ejector unit are integrated, in the refrigeration cycle in which the control valve is used, a flow rate adjustment valve (motor operated valve) like a conventional one is used. It is no longer necessary to connect the ejector to the ejector using a conduit or a joint. Therefore, it is possible to reduce the parts cost and assembly cost of the piping system in the refrigeration cycle using the ejector, and to save space and simplify the system. it can.

  In addition, since the upper end inlet of the nozzle is connected and fixed to the downstream portion of the valve seat in the valve body, the valve shaft of the motor-operated valve can be compared with a conventional nozzle whose diameter is variable by the motor-operated valve. It is possible to improve the workability and assembly of the components of the motor-operated valve and the ejector, such as shortening the length.

  Furthermore, by making the valve seat and the valve body separate, if multiple types of valve seats with different orifice diameters (the same dimensions except for the diameter) are prepared, the capacity can be changed just by replacing the valve seat. Thus, since components other than the valve seat can be shared, it is possible to provide a plurality of types of ejector devices having different capacities at a low cost.

It is a longitudinal cross-sectional view which shows one Embodiment of the ejector apparatus which concerns on this invention, (a) is a whole block diagram, (b) is an enlarged view of A part of (a). Sectional drawing which shows an example of the flow regulating valve (motor-operated valve) and ejector which are used for the conventional refrigerating cycle. The circuit diagram which shows an example of the conventional freezing cycle.

  Hereinafter, embodiments of an ejector device of the present invention will be described with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing an embodiment of an ejector device according to the present invention.
The ejector device 1 of the illustrated embodiment is used in place of the flow rate adjustment valve 110 and the ejector 160 in the refrigeration cycle 100 as shown in FIG. 3 described above. In the ejector device 1 of the present embodiment, the same reference numerals are given to portions corresponding to the respective portions of the conventional flow rate adjusting valve 110 and the ejector 160 shown in FIG.

  The ejector device 1 of the present embodiment adjusts the lift amount of the valve body 24 with respect to the valve body 20, the valve body 20 having the valve seat 22a in which the orifice 23 opened and closed by the valve body 24 is formed, and the orifice 23. The electric valve unit 10 for adjusting the flow rate provided with a raising and lowering drive mechanism including the rotor 30, the stator 50, etc., and the ejector unit 60 including a nozzle 71 having a fixed diameter, a mixing unit 72, and a diffuser unit 73. Yes.

  The valve main body 20 extends and expands downward from the conventional one shown in FIG. 2 so as to serve as the upper fixing portion 67 in the ejector portion 60.

  The upper end inlet portion of the nozzle 71 is connected and fixed to a portion of the valve body 20 on the downstream side of the valve seat 22a, and the electric valve portion 10 and the ejector portion 60 are integrated.

  Further, the valve seat 22a and the valve main body 20 are separated from each other, and the valve seat 22a is fitted and fixed to the lower end portion of the cylindrical upper fixing portion 67 constituting the lower portion of the valve main body 20 by press fitting or the like. .

  In this example, the distal end of the valve body 24 includes a first taper portion 24a formed continuously from the valve shaft, and a second taper portion 24b formed continuously from the first taper portion 24a. The orifice 23 formed in the valve seat 22a is inserted with the second taper portion 24b at the tip of the orifice when the valve body 24 is lowered, and the first taper portion 24a is seated on the valve seat 22a.

  In the ejector device 1 of the present embodiment configured as described above, the electric valve unit 10 for flow rate adjustment and the ejector unit 60 are integrated, so that in the refrigeration cycle in which the ejector device 1 is used, It is no longer necessary to connect the flow rate adjustment valve (motor valve) and ejector using a conduit or joint, as in the case of the above, which can reduce the parts cost and assembly cost of the piping system in the refrigeration cycle and save space. Also, simplification and the like can be achieved.

  In addition, since the upper end inlet portion of the nozzle 71 is connected and fixed to the downstream side of the valve seat 22a in the valve body 20, the diameter of the conventional nozzle (in the middle or lower end outlet portion) is made variable by an electric valve. Compared to the above, it is possible to improve the workability and assembly of the components of the motor-operated valve and the ejector, such as shortening the length of the valve shaft of the motor-operated valve.

  Furthermore, since the valve seat 22a and the valve body 20 are separated, if multiple types of valve seats having the different diameters of the orifices 23 (the same dimensions except for the diameter) are prepared, the ejector device can be manufactured at the time of manufacture. Capacitance can be made different by simply replacing the valve seat 22a. This allows parts other than the valve seat 22a to be shared, so that multiple types of ejector devices with different capacities can be provided at low cost. Is possible.

  When the tip of the valve body 24 is provided with a first taper portion 24a and a second taper portion 24b as shown in FIG. 1, the diameter of the orifice 23 is such that the first taper portion 24a is seated on the valve seat 22a. Can be selected.

  Further, in the configuration of FIG. 1, if a plurality of different types of nozzles 71 are prepared in advance, it is possible to provide an ejector apparatus having different capacities by simply replacing the nozzle 71 at the time of manufacturing the ejector apparatus. .

  In FIG. 1, the valve seat 22 is fixed to the upper fixing portion 67 so that the outer periphery thereof has a gap between the nozzle 71 and the valve seat 22, but this gap may be omitted.

1 Ejector device
10 Electric valve for flow adjustment
20 Valve body
22 Valve seat
23 Orifice
24 Disc
30 rotor
50 stator
60 Ejector section
65 Cylindrical substrate
67 Upper fixing part
68 Lower fixing part
71 nozzles
72 Mixing section
73 Diffuser

Claims (2)

  A valve body, a valve body having a valve seat in which an orifice that is opened and closed by the valve body is formed, and a flow rate provided with an elevating drive mechanism including a rotor, a stator and the like for adjusting the lift amount of the valve body with respect to the orifice It consists of an electric valve part for adjustment and an ejector part with a fixed nozzle, mixing part, and diffuser part, and the upper end inlet part of the nozzle is connected to a part of the valve body downstream of the valve seat An ejector device, wherein the electric valve portion and the ejector portion are fixed and integrated.   2. The ejector device according to claim 1, wherein the valve seat and the valve main body are separated.

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