WO2010028526A1 - A rotary compressor with an air injection device - Google Patents

Abstract

A rotary compressor with an air injection device is provided, wherein an air injection hole (141) connected with a cylinder chamber is placed in a cylinder body assemble (12) which forms the seal cylinder chamber, the piston type air injection device is placed to correspond to the air injection hole, and the piston type air injection device has an air injection passage and a control mechanism which can open and close the air injection passage by a way of a piston. The rotary compressor utilizes the piston to control the opening and closure of the air injection passage, so it has the advantage of compact structure and high integration level.

Description

 BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor used in systems such as air conditioners, refrigerators, and refrigerators, and more particularly to a rotary compressor.

Prior art prior to the present invention A conventional rotary compressor consists of a main part such as a casing, an electric motor, a crankshaft, a cylinder, a roller, a slide, an upper flange, and a lower flange. 1 is a schematic view of the roller 17, the slide 16 and the cylinder 12, etc., the cylinder 12 is provided with an air inlet 121 and an exhaust port 122, and the upper and lower ends of the cylinder 12 are assembled by the upper and lower methods. The blue seal (not shown) constitutes the sealed cylinder chamber of the compressor. The roller 17 is disposed in the cylinder chamber and is mounted on the eccentric crankshaft 15 driven by the motor. The roller 17 rolls along the inner wall of the cylinder 12, and the cylinder 12 forms a crescent-shaped working cavity, and the sliding piece 16 is in close contact with the roller 17 by the force of the spring, and the crescent-shaped working cavity is divided into two parts, and the volume of each part of the working cavity is along with the rotation angle of the roller. Change, the pressure of the gas in the volume changes with the volume, thus completing the working process of the compressor.

 In the use of a conventional rotary compressor, especially under low-temperature heating conditions, the exhaust gas temperature is low due to the low intake air temperature, so that the low-temperature heating capacity of the air conditioner is low. In order to improve the low-temperature heating capacity of the air conditioner using the rotary compressor, the high heating capacity is achieved, and during the heating, the temperature and pressure of the compression working fluid in the cylinder chamber of the rotary compressor are increased by the principle of jet enhancement technology. It is very important and necessary.

The applicant discloses a rotary compressor having a jet-enhancing function in the Chinese patent 200720050796.7, which is provided with an upper bearing (upper flange) or a lower bearing (lower flange) in the rotary compressor a plurality of gas injection holes, the one or more gas injection holes cooperating with a pipeline, such that a cylinder of the compressor can communicate with the outside of the compressor through the gas injection holes and pipelines, and a one-way valve is disposed at the gas injection holes, so that the external fluid The cylinder chamber and the gas injection hole may enter the cylinder chamber, and the fluid of the cylinder chamber cannot be discharged through the gas injection hole and the pipeline. The above patented technology improves the structure of the conventional rotary compressor, so that the refrigerant in the gaseous form can be injected into the cylinder bore of the compressor through a pipeline, the intake temperature of the rotary compressor is improved, the compression efficiency is improved, and energy saving is achieved. The advantages. However, in the above patented technology, the air vent hole The one-way valve is set, and the open one-way valve is in the form of a steel ball with a round hole. The one-way valve has no special control mechanism, and can only be controlled by the injection gas. The structure and control mode are simple, and the reliability remains to be determined. strengthen.

Purpose of the invention

 SUMMARY OF THE INVENTION The object of the present invention is to provide a rotary compressor having a jet device, which adopts a steam injection device with reliable structure and flexible control mode to effectively achieve the purpose of compressor increase.

Technical solution adopted by the invention

 The above objectives are achieved by the following technical solutions:

 A rotary compressor having a jet device, characterized in that a through-hole type for connecting a cylinder chamber is formed in a cylinder block constituting a sealed cylinder chamber, and a piston type jet device is disposed corresponding to the gas injection hole, The piston type jet device has a control mechanism for injecting a gas passage, and controlling the opening or closing of the injection gas passage in a piston manner.

 The piston type jet device specifically includes:

 a sealing cylinder having an inlet port corresponding to the gas injection hole and a control air pressure port and an injection port opened at different heights in the axial direction of the cylinder body, the injection gas passage being formed at the injection port and the gas injection hole Between

 a piston disposed in the sealing cylinder; the piston isolating the control air pressure chamber and the injection chamber in the sealing cylinder;

 The piston slides between a first position and a second position in the sealing cylinder. In the first position, the injection gas passage is in a blocking closed state; in the second position, the injection gas passage is in communication opening status.

The rotary compressor provided by the invention adopts a piston type steam injection device, and the control mechanism of the piston movement mode controls the opening or closing of the injection gas passage, and the controllable realization of the rotary compressor between increasing or not increasing Switching, to improve the temperature and pressure of the compressed working fluid in the cylinder chamber under the low-temperature heating condition, to increase the exhaust temperature and improve the heating capacity of the air-conditioning system; and to facilitate the reliable control of the compressor Running. The present invention further provides a specific structure of the piston type air jet device, by providing a corresponding pipeline and a control valve, and using a suitable air pressure as a driving force for controlling the movement of the piston type control mechanism of the injection gas passage, The invention has a compact structure and high integration. At the same time, it has a good sealing effect and the control method is more flexible and reliable.

DRAWINGS

 Figure 1 is a schematic view showing the cooperation of a roller, a sliding piece and a cylinder in a conventional rotary compressor;

 Figure 2 is a cross-sectional view of the piston type air jet device provided in the first embodiment, wherein the piston is in the first position; Figure 3 is a cross-sectional view of the piston type air jet device provided in the first embodiment, wherein the piston is in the second position; A cross-sectional view of a piston type jet device provided in Example 2;

 Figure 5 is a cross-sectional view showing a matching portion of a lower flange and a piston type jet device in a rotary compressor according to the present invention;

 Figure 6 is a partial cross-sectional view showing another manner of cooperation between the lower flange and the piston type jet device of the rotary compressor according to the present invention;

 Figure 7 is a cross-sectional view showing a matching portion of a cylinder and a piston type jet device in a rotary compressor according to the present invention;

 Figure 8 is a cross-sectional view showing the integrated connection of a cylinder block assembly and a piston type jet device in a rotary compressor according to the present invention;

 Figure 9 is a schematic illustration of the application of the rotary compressor of the present invention in a refrigeration system.

detailed description

 The rotary compressor provided by the present invention comprises: a casing, a motor, a crankshaft, a cylinder, an upper flange, a lower flange, a roller, a sliding piece, etc., and the above components and their installation relationship are prior art, and are not described herein again. . DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific embodiment of a piston type air jet apparatus used in a compressor provided by the present invention will be separately described with reference to the accompanying drawings.

Embodiment 1

As shown in FIG. 2, the piston type air jet device provided in the first embodiment includes a sealing cylinder 21 and a piston 22. The sealing cylinder 21 has a cylindrical shape, and one end is an opening portion 211 for engaging with the lower flange 14 of the compressor. The opening portion 211 is embedded in the mounting groove of the lower flange 14 around the air injection hole 141, and a sealing ring 231 is disposed around the opening portion 211 to achieve a sealed connection with the lower flange 14. The opening and the opening of the opening portion 211 The air injection holes 141 opened in the blue 14 are in communication with each other, and the control air pressure port 213 and the injection port 214 are also opened at different heights on the sealing cylinder 21. The piston 22 is substantially cylindrical and disposed in the sealing cylinder 21. The outer edge of the piston 22 is provided with a first sealing mechanism. The first sealing mechanism is disposed around the periphery of the piston 22 and located at The sealing ring 232 and the sealing ring 233 between the control air pressure port 213 and the injection port 214 isolate the control air pressure chamber 230 communicating with the control air pressure port 213 in the sealing cylinder 21 through the piston 22 and the sealing rings 232, 233 and a spray chamber 240 communicating with the injection port 214, the piston 22 is further provided with a second sealing mechanism at the end thereof. The second sealing mechanism is a gasket 24 disposed at one end of the piston toward the lower hole 14 of the lower flange 14. The piston 22 is sealed. The first position (as shown in FIG. 2) and the second position (FIG. 3) in the cylinder 21 slide, and in the first position, the gasket 24 blocks the air injection hole 141 formed in the lower flange 14, in the second position. A gas injection hole 141 opened in the flange 14 communicates with the injection port 214.

Embodiment 2

 As shown in FIG. 4, the piston type air jet device provided in the second embodiment is different from the first embodiment in that: (1) a spring 28 is added, which is disposed in the control air pressure chamber 230, and one end is connected to the piston 22, and the other end is connected with The inner wall of the sealing cylinder 21 is connected for adjusting the force of the piston 22; (2) the first sealing mechanism is two convex rings 291 disposed around the periphery of the piston 22 and located between the control air pressure port 213 and the injection port. , 292.

 An application example of the rotary compressor in a refrigeration system will be described below with reference to FIGS. 5 and 9. As shown in FIG. 9, a schematic diagram of an air conditioning system using the rotary compressor of the present invention, the air conditioning system includes a compressor a circulating system in which the outdoor heat exchanger, the first throttle device 34, the accumulator 35, the second throttling device 36, and the indoor heat exchanger are sequentially connected, and is further connected after the compressor exhaust pipe in the system A four-way valve 37 that controls the flow of the system fluid to thereby achieve the conversion of cooling or heating. At the same time, in the air conditioning system, by providing a first control air tube 251, a second control air tube 252, an injection tube 26, a first valve 31 and a second valve 32, wherein the control air pressure port 213 of the piston type air jet device passes through A control air pressure pipe 251 is connected to the compressor suction port, and the first control air pipe 251 is provided with a first valve 31; the control air pressure port 213 is also connected to the compressor exhaust port through the second control air pipe 252, the second control air pressure The second valve 32 is disposed on the tube 252; the injection port 214 is connected to the injection gas source-reservoir 35 through the injection pipe 26, and the expansion pipe 33 is disposed on the injection pipe.

The working principle of the present invention will be described below: The force applied to the piston 22 in the piston type air jet device includes the control pressure Pd of the control port 213, the external gas pressure Ps of the injection port, and the pressure Pt of the compressed air in the cylinder chamber. During the heating process, the enthalpy valve 33 and the first valve 31 are opened and the second valve 32 is closed (see FIG. 9). At this time, the control air port 213 of the piston type air jet device is connected to the suction port of the compressor, and the injection port 214 is connected. Connect the external injection gas source, Pd<Ps+Pt, and the piston 22 passes through the control air pressure port 213 The pressure difference between the injection port 214 and the injection port 214 is pushed downward (as shown in Fig. 2), and the external air is introduced into the cylinder bore of the compressor through the gas injection hole 141 opened in the lower flange 14, thereby achieving the purpose of increasing the enthalpy. When not increasing (cooling process), the second valve 32 is opened and the first valve 31 and the boosting valve 33 are closed, the control air pressure port 213 is connected to the compressor discharge pressure, Pd>Ps+Pt, and the piston 22 is controlled by the air pressure port. The pressure of 213 is reset upward (Fig. 3), and the gasket 24 blocks the gas injection hole 141, thereby preventing external air from entering the compressor cylinder chamber through the gas injection hole 141, achieving a good sealing effect. Of course, the piston can also be controlled by other pneumatic or hydraulic sources, ie by connecting the control air chamber to other pneumatic or hydraulic sources.

 In the above embodiment, the gas injection hole 141 is opened on the lower flange 14, and the piston type air jet device mounts the lower end or the side end of the lower flange 14. However, it will be apparent to those skilled in the art that the gas vents can be completely formed on any of the components of the cylinder assembly that form the sealed cylinder chamber. Typically, the cylinder assembly that constitutes the cylinder chamber includes an upper flange, a lower flange, and The cylinder, the upper flange and the lower flange are arranged at both ends of the cylinder to form a sealed cylinder chamber, so the gas injection hole can also be opened on the upper flange 13 or the cylinder 12 (Fig. 7). In addition, the shape of the gas jet holes can be various, and can be straight holes (as shown in Fig. 5 and Fig. 7), or straight holes (Fig. 6) or other forms of holes.

In the above embodiment, the connection manner between the piston type air jet device and the cylinder block assembly is a split-fit connection method, and the connection mode adopts a disassembly and assembly manner between the piston type jet device and the cylinder block assembly. The above embodiments are only one specific embodiment of the plug-in connection, and do not limit all the plug-in connection manners of the present invention, and those skilled in the art may also adopt the conventional method, such as a screw connection or a plug-in connection. The technical means such as snapping, etc., are also within the scope of protection of the present invention; the connection between the piston type jet device and the cylinder block assembly also includes an integral connection, and the contents of the integral connection are: body fittings of the piston type jet device It is integrated with the cylinder assembly, and can be integrated or spliced into one body by specific conventional technical means, as shown in Fig. 8: Sealing of the cylinder 12 of the cylinder assembly and the main assembly of the piston type jet device Cylinder 21-body design (splicing or part design integration), in order to achieve the same technical effect, the technology in the field Members will be designed to be easily sealed cylinder 21 is designed as a straight cylindrical open bottom end, and then installed at the bottom of the opening Various capping a bottom cover 215, to achieve the purpose of sealing. In addition, an opening cover may be added to the opening portion of the first embodiment, and an air inlet corresponding to the air injection hole may be formed on the end cover or other portions of the sealing cylinder; of course, other similar technologies may be used. means. Other components are connected in a similar manner to the other embodiments, and will not be described here. The above-mentioned embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and equivalent changes or modifications to the structures, features and principles described in the claims of the present invention should be included. Within the scope of the present patent application.

Claims

Rights request A rotary compressor having a jet device, characterized in that a through-hole type for connecting a cylinder chamber is formed in a cylinder block constituting a sealed cylinder chamber, and a piston type jet device is provided corresponding to the gas injection hole The piston type jet device has a control mechanism for injecting a gas passage, and controlling to open or close the injection gas passage in a piston manner.  2. The rotary compressor with a jet device according to claim 1, wherein the piston-type jet device specifically comprises:  a sealing cylinder having an inlet port corresponding to the gas injection hole and a control air pressure port and an injection port opened at different heights in the axial direction of the cylinder body, the injection gas passage being formed at the injection port and the gas injection hole Between  a piston disposed in the sealing cylinder; the piston isolating the control air pressure chamber and the injection chamber in the sealing cylinder;  The piston slides between a first position and a second position in the sealing cylinder. In the first position, the injection gas passage is in a blocking closed state; in the second position, the injection gas passage is in communication opening status.  3. The rotary compressor with a jet device according to claim 2, wherein the piston-type jet device specifically comprises:  a sealing cylinder having an opening corresponding to the gas injection hole and a control air pressure port and an injection port formed on the cylinder body at different heights in the axial direction of the cylinder body, the injection gas passage being formed between the injection port and the gas injection hole; a piston is disposed in the sealing cylinder; the piston isolates the control air pressure chamber and the injection chamber in the sealing cylinder;  The piston slides between a first position and a second position in the sealing cylinder, the piston tip end blocking the gas injection hole in the first position; the gas injection hole in the second position The injection port is connected. The rotary compressor having a jet device according to claim 3, wherein the outer periphery of the piston is provided with a first sealing mechanism. The rotary compressor with a jet device according to claim 4, wherein the first sealing mechanism is a seal ring disposed around a periphery of the piston and located between the control air pressure port and the injection port. The rotary compressor with a jet device according to claim 4, wherein the first sealing mechanism is a convex ring disposed around a periphery of the piston and located between the control air pressure port and the injection port. 7. The rotary compressor with a jet device according to claim 3, wherein the piston type jet device further comprises a spring disposed in the control air chamber, the spring end being connected to the piston, and One end is connected to the inner wall of the sealing cylinder.  The rotary compressor having a jet device according to claim 3, wherein the piston is provided with a second sealing mechanism for blocking the gas injection hole toward the tip end portion of the gas injection hole.  The rotary compressor with a jet device according to claim 8, wherein the second sealing mechanism is a gasket.  10 . The rotary compressor with a jet device according to claim 1 , wherein the cylinder assembly comprises an upper flange, a lower flange and a cylinder, and the upper flange and the lower flange are disposed in the cylinder. The end circumference is formed by a sealed cylinder chamber, and at least one of the gas injection holes is formed in the upper flange and/or the lower flange and/or the cylinder.  11. A rotary compressor with a jet device according to claim 1, wherein the piston-type jet device is connected to the cylinder assembly in an integral or partial fit.  12. The rotary compressor with a jet device according to claim 11, wherein the split mating connection comprises a threaded connection and an interposed connection.  The rotary compressor with a jet device according to claim 12, wherein the plug connection is: a cylinder block is provided with a mounting groove around the gas injection hole, and the steam injection sealing device seals the opening of the cylinder The mounting groove is embedded in the mounting groove, and a sealing ring is disposed around the opening.