JPS60126554A - Ejector suction pump - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement in an ejector suction pump used in an ejector type cooling device.

(Prior art) Ejector type cooling system fN is also called steam injection cooling system.
All of the high-temperature, high-pressure steam generated by the drive steam generator is ejected at high speed from the nozzle in the ejector, and the low-humidity, low-pressure steam from the evaporator is pulled in by kneading, and then the entire mixture of both is released in the diffuser in the ejector. The refrigerant is compressed and sent to the condenser, and the heat of vaporization of the refrigerant in the evaporator produces a cooling effect.

An example of an ejector suction pump used in such an ejector-type cooling device is shown in FIG. This ejector suction pump J has a driving steam inlet 2 connected to a driving steam generator (not shown), a refrigerant steam inlet 8 connected to an evaporator (not shown), and a discharge port 4 connected to a condenser (not shown). and has. The refrigerant vapor inlet 8 communicates with a mix chamber 5 provided inside the inlet section, and the drive vapor inlet 2 communicates with the mix chamber 5 via a Laval nozzle 6. A diffuser 7 having a narrowed intermediate portion is formed between the mix chamber 5 and the discharge port 4. The diff user 7 includes a leading part 7a, a parallel part 7b, and a wide end part 7C.
It consists of three parts.

To explain the operation of this ejector suction pump, when high-temperature and high-temperature driving steam is sent from a driving steam generator (not shown), this driving steam is accelerated by the Laval nozzle 6 and becomes supersonic, resulting in a jet stream 8. is formed and ejected into the mix chamber 5. At this moment, this eruption! Since the kIl vapor pulls the gas in the mix chamber 5, the pressure in the mix chamber 5 decreases, and low-temperature, low-pressure refrigerant vapor generated from an evaporator (not shown) is sucked into the mix chamber 5 through the refrigerant vapor inlet 3. Ru. At this time, air conditioning is achieved by the heat of vaporization of the refrigerant flowing into the evaporator. The mixed vapor of driving steam and refrigerant vapor mixed in the mix chamber 5 is compressed in the diffuser 7, and after the pressure increases, it is discharged from the discharge port 4, and after being cooled and liquefied in a condenser (not shown), It is sent to a drive steam generator and evaporator (not shown).

However, in such conventional ejector suction pumps, a driving steam injection nozzle is placed in a V-position at the axis of the ejector suction pump, and refrigerant is injected into a mix chamber formed around the nozzle from only one direction perpendicular to the injection direction of the driving steam. Since the structure was such that the steam was sucked, the efficiency of towing the refrigerant vapor of the driving steam [0] on the side opposite to the refrigerant vapor suction port 3 was lower than that of the driving steam 9 on the side of the refrigerant vapor suction port a, and as a whole, The suction efficiency of refrigerant vapor decreases. Furthermore, since the refrigerant vapor is sucked in a curved manner as shown in the flow m], there is a problem in that the pipe resistance increases and the suction efficiency decreases.

(Purpose of Inventive Power) An object of the present invention is to solve the problems in the conventional ejector suction pump, and to obtain an ejector suction pump that has a simple and inexpensive configuration and has good refrigerant vapor suction efficiency.

(Structure of the Invention) In order to achieve this object, the ejector suction pump of the present invention is provided with a suction pipe for sucking all of the low-temperature, low-pressure refrigerant vapor so as to substantially coincide with the axis of the ejector suction pump, and an air storage chamber for driving steam. and the boss that formed the discharge nozzle.
The driving steam introduction pipe which is arranged in the suction pipe and supplies the driving steam to this boss is installed in the suction pipe part 1? It is characterized by being provided by being inserted through it.

(Example) The ejector suction pump of the present invention will be described in detail below with reference to the drawings.

FIG. 2 is a diagram showing an embodiment of the ejector suction pump of the present invention. This ejector suction pump 2° is provided with a refrigerant vapor suction pipe 22 having a refrigerant vapor suction port 2 at one end so that its axis coincides with the axis of the ejector suction pump 2o. A boss 23 is disposed at approximately the axial center position within this refrigerant vapor suction pipe 22, an air storage chamber 24 and a Laval nozzle 25 are formed in this boss 23, and a driving steam inlet 26 is formed at one end. The introduction pipe 27 is inserted through the side of the refrigerant vapor suction pipe 22 to communicate with the air storage chamber 24 of the boss 23 .

A mix chamber 28 is formed around the boss 23 in the refrigerant vapor suction pipe 22.
It consists of a parallel part 9a, a parallel part 29b, and a diverging part 2RO, and has almost the same structure as the above-mentioned conventional example. 3o is a discharge port connected to a condenser (not shown).

Next, the operation of this ejector suction pump 2o will be explained. The high-temperature, high-pressure driving steam sent from a driving steam generator (not shown) is supplied to the driving steam introduction pipe 2 from the driving steam inlet 26.
After entering the air storage chamber 24 through the Laval nozzle 25, a jet stream 3] is formed and ejected at supersonic speed. As a result, the gas in the mix chamber 28 is pulled and the pressure in the mix chamber 28 is lowered, and low-temperature, low-pressure refrigerant vapor is sucked into the refrigerant vapor inlet 2 from an evaporator (not shown).
] The refrigerant vapor is drawn into the mix chamber 28 in the refrigerant vapor suction pipe 22. At this time, the refrigerant vapor suction pipe 22 is formed into a substantially planar/tubular shape and has no bent portions, so that the refrigerant vapor suction resistance is small. In addition, since the refrigerant vapor is sucked in so as to surround almost the entire circumference of the boss 23 forming the Halaval nozzle 25, the suction efficiency of the refrigerant vapor by the driving steam is uniform over the entire circumference of the Laval nozzle 25, and the kneading process is similar to that of the conventional ejector suction pump. The overall refrigerant vapor suction efficiency is improved compared to the above. Although the connection between the drive steam introduction pipe 27 and the storage chamber 24 is bent at right angles, the flow velocity of the drive steam increases when it passes through the constriction part 'f of the Laval nozzle 25, so the pressure is high at this bend. Since the flow rate is slow and a certain amount of volume is secured by the storage chamber 24, the curved portion hardly acts as a resistance to the flow of driving steam because the pressure energy is temporarily stored in the storage chamber 24. The mixed vapor of driving vapor and refrigerant vapor thus mixed in the mix chamber 28 is then compressed in the diffuser 29. After the pressure increases, it is sent from the discharge port 30 to M & la, not shown, and is condensed. After being cooled and liquefied in the vessel, it is sent to a drive steam generator and an evaporator.

(Effects of the Invention) As described in detail above, the ejector suction pump of the present invention has a suction pipe for sucking refrigerant vapor located at the axis of the ejector suction pump.
A driving steam introduction pipe that supplies driving steam to the refrigerant vapor suction pipe by disposing a boss in the refrigerant vapor suction pipe, which is provided so as to correspond to the volume of the driving steam, and forms an air storage chamber and a discharge nozzle for the driving steamer. The refrigerant vapor suction pipe area (part of the refrigerant vapor inlet pipe is pushed through), so the refrigerant vapor introduction pipe is almost an old pipe, so the suction resistance is reduced, and the refrigerant vapor is distributed evenly in all directions relative to the driving steam. Because of the contact, the refrigerant vapor suction efficiency is definitely improved compared to conventional ejector suction pumps.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing the structure of a conventional ejector suction pump, and FIG. 2 is a sectional view showing the structure of an embodiment of the ejector suction pump of the present invention. ]... Ejector suction pump 2... Drive steam inlet 3... Refrigerant vapor inlet 4.
...Discharge port 5...Mix chamber 6...Laval nozzle 7...Diff user 7a...Tapered part 7
b...Parallel part 70...Divergent part 8...Jouting flow 9,]0...Drive steam Moon...Streamline 20...Ejector suction pump 2]...Refrigerant vapor suction port 22 ...Refrigerant vapor suction pipe 28...Boss 24...Air storage chamber 25...Ut<-le nozzle 26...Driving steam inlet 27...Driving steam inlet pipe 28...Mix Chianno (29... Diff user 29a... Tapered part 29b... Parallel part 290... Wide end part 30...
Discharge port 3]... Jet flow. Patent applicant Nissan Motor Co., Ltd.

Claims (1)

[Claims] 1. A suction pipe for sucking low-humidity, low-pressure refrigerant vapor is provided so as to be substantially aligned with the axis of the ejector suction pump, and a boss forming a storage chamber for driving steam and a discharge nozzle is disposed within the suction pipe, and this boss An ejector suction pump characterized in that a driving steam introduction pipe for supplying driving steam to the ejector is inserted through a side portion of the suction pipe.