Refrigeration three-stage compressor

Abstract

The application discloses a kind of refrigeration three-stage compressor, it is related to refrigeration compressor technical field, including first shell casting and motor body, motor body is equipped inside first shell casting, first male screw rod rotor and first female screw rod rotor are rotationally equipped inside second shell casting, first male screw rod rotor one end extends to the rotor body inside motor body and is connected with rotor body, impeller shaft one end is connected with first male screw rod rotor, centrifugal impeller is installed on impeller shaft, second male screw rod rotor and second female screw rod rotor are rotationally equipped inside third shell casting;The application is formed coaxial structure by four, and is driven by motor body, that centrifugal impeller has the characteristics suitable for low pressure ratio large displacement, also can exert the characteristics suitable for high pressure ratio working condition application that screw rod rotor has, in high pressure ratio refrigeration field, refrigeration and energy-saving effect is remarkable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration compressor, in particular to a refrigeration three-stage compressor. BACKGROUND

[0002] Single-stage screw compressor is a kind of positive displacement compressor, which is composed of a cylindrical screw and two symmetrical plane star wheels arranged in meshing pair, installed in the casing, and air enters the air compressor through the air inlet and is directly compressed by the screw rotor once, directly increasing from the suction pressure to the discharge pressure. In the single-stage compression process, the screw rotor and the casing form a closed compression chamber, and the volume of the compression chamber gradually decreases with the rotation of the screw, thereby realizing the compression of the gas. Two-stage screw compressor is a screw compressor that uses two-stage compression. Its working principle is that through the rotation of a pair of intermeshing screw rotors in the casing, the gas in the rotor tooth groove produces periodic volume change, thereby realizing the suction, compression and discharge of the gas. In the first stage of compression, the gas is preliminarily compressed; in the second stage of compression, the preliminarily compressed gas is further compressed to achieve the required pressure.

[0003] The working principle of centrifugal compressor is to convert mechanical energy into gas pressure energy by means of impeller, when the gas flows through the impeller of centrifugal compressor, the high-speed rotating impeller gives the gas centrifugal force, so that the gas pressure is increased, and at the same time the speed is also increased, then the gas flow rate decreases when flowing through the passage of diffuser, the flow rate of the front gas molecules decreases, and the rear gas molecules constantly flow forward, so that most of the kinetic energy of the gas is converted into static pressure energy, which plays a role in further increasing the pressure.

[0004] However, the pressure ratio of the single-stage compressor and the two-stage compressor in the prior art still cannot meet the use needs in the field of ultra-low temperature and high pressure ratio refrigeration, and the combination of centrifugal compressor and two-stage compressor can realize the increase of pressure ratio. Therefore, the present application provides a refrigeration three-stage compressor to solve the problems in the prior art. SUMMARY

[0005] In view of the above problems, the present application aims to provide a refrigeration three-stage compressor, which is connected with the rotor body by extending one end of the first male screw rotor to the inside of the rotor body of the motor body, connected with the first male screw rotor by one end of the impeller shaft, connected with the first male screw rotor by one end of the second male screw rotor, and the four of the rotor body, the impeller shaft, the first male screw rotor and the second male screw rotor form a coaxial structure and are all driven by the motor body, forming a three-stage compressor structure which is simple, can play the characteristics of centrifugal impeller suitable for low pressure ratio and large displacement, and can also play the characteristics of screw rotor suitable for high pressure ratio working condition application.

[0006] To achieve the above object, the present application provides the following technical solutions:

[0007] A refrigeration three-stage compressor comprises a first shell casting, a motor body, a suction cover casting, a second shell casting, a first male screw rotor, a first female screw rotor, a impeller shaft, a centrifugal impeller, a first bearing seat casting, an exhaust end casting, a third shell casting, a second bearing seat casting, a second male screw rotor and a second female screw rotor.

[0008] Further improvements are that the suction channel is formed between the air inlet and the centrifugal compression volute exhaust port, and the second bearing seat casting is provided with an air outlet.

[0009] Further improvements are that the first male screw rotor and the first female screw rotor are arranged in an up-down parallel mode in the second shell casting, and the first male screw rotor and the first female screw rotor are adapted to each other.

[0010] Further improvements are that the second male screw rotor and the second female screw rotor are arranged in an up-down parallel mode in the third shell casting, and the second male screw rotor and the second female screw rotor are adapted to each other.

[0011] Further improvements are that the first bearing seat casting is internally provided with a first bearing body and a second bearing body, the first male screw rotor is extended to the inside of the first bearing seat casting and is rotatably installed in the first bearing seat casting through the first bearing body, and the first female screw rotor is extended to the inside of the first bearing seat casting and is rotatably installed in the first bearing seat casting through the second bearing body.

[0012] Further improvement lies in that the second bearing seat casting is internally provided with a third bearing body and a fourth bearing body, one end of the second male screw rotor is extended into the second bearing seat casting and is rotatably installed with the second bearing seat casting through the third bearing body, and one end of the second female screw rotor is extended into the second bearing seat casting and is rotatably installed with the second bearing seat casting through the fourth bearing body.

[0013] Further improvement lies in that the second shell casting is provided with an opening at the top, and a sealing plate is installed above the opening through bolts.

[0014] Further improvement lies in that the first shell casting and the air suction cover casting are provided with a support casting at the connecting position, the support casting is internally provided with a support bearing, and the impeller shaft is connected with the support casting through the support bearing in the support casting.

[0015] Further improvement lies in that the outer side of the connecting position of the first male screw rotor and the impeller shaft is provided with a pressing nut, and the first male screw rotor is connected with the rotor body through the pressing nut.

[0016] The beneficial effects of the present application are that the first male screw rotor is connected with the rotor body after being extended into the rotor body of the motor body, the impeller shaft is connected with the first male screw rotor, the second male screw rotor is connected with the first male screw rotor, the rotor body, the impeller shaft, the first male screw rotor and the second male screw rotor form a coaxial structure, and are all driven by the motor body, the three-stage compressor has a simple structure, can play the characteristics of the centrifugal impeller suitable for low pressure ratio and large displacement, and can play the characteristics of the screw rotor suitable for high pressure ratio working conditions, the three-stage compressor can increase the pressure ratio by 2-3 times, has remarkable refrigeration and energy saving effects in the high pressure ratio refrigeration field, and as a whole structure, the three-stage compressor has the same convenient and simple operation principle as the single-stage compressor in the refrigeration system, and has wide application prospect. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a main view schematic diagram of the structure of the present application;

[0018] Fig. 2 It is a main view schematic diagram of the internal structure of the air suction cover casting of the present application.

[0019] Wherein: 1, the first shell casting; 2, motor body; 3, suction cover casting; 4, second shell casting; 5, the first male screw rotor; 6, the first female screw rotor; 7, rotor body; 8, impeller shaft; 9, centrifugal impeller; 10, the first bearing seat casting; 11, exhaust end casting; 12, third shell casting; 13, second bearing seat casting; 14, the second male screw rotor; 15, the second female screw rotor; 16, suction port; 17, centrifugal compression volute exhaust port; 18, inlet; 19, outlet; 20, the first bearing body; 21, the second bearing body; 22, the third bearing body; 23, the fourth bearing body; 24, opening; 25, sealing plate; 26, support casting; 27, support bearing; 28, compression nut. DETAILED DESCRIPTION

[0020] In order to deepen the understanding of the present application, the present application will be further described below in conjunction with examples, which are only used to explain the present application and do not constitute a limitation on the scope of protection of the present application.

[0021] According to Figs. 1-2 As shown in the figure, the present embodiment proposes a refrigeration three-stage compressor, which comprises a first shell casting 1 and a motor body 2, the first shell casting 1 is internally provided with the motor body 2, one side of the first shell casting 1 is provided with a suction cover casting 3, the other side of the first shell casting 1 is provided with a second shell casting 4, the second shell casting 4 is internally rotatably provided with a first male screw rotor 5 and a first female screw rotor 6, one end of the first male screw rotor 5 extends into the rotor body 7 of the motor body 2 and is connected with the rotor body 7, the suction cover casting 3 is internally rotatably provided with an impeller shaft 8, one end of the impeller shaft 8 is connected with the first male screw rotor 5, the impeller shaft 8 is installed with a centrifugal impeller 9, one side of the second shell casting 4 is provided with a first bearing seat casting 10, one side of the first bearing seat casting 10 is provided with an exhaust end casting 11, one side of the exhaust end casting 11 is provided with a third shell casting 12, one side of the third shell casting 12 is provided with a second bearing seat casting 13, the third shell casting 12 is internally rotatably provided with a second male screw rotor 14 and a second female screw rotor 15, one end of the second male screw rotor 14 is connected with the first male screw rotor 5, the rotor body 7, the impeller shaft 8, the first male screw rotor 5 and the second male screw rotor 14 form a coaxial structure, one end of the suction cover casting 3 is provided with a suction port 16, the suction cover casting 3 at the position of the centrifugal impeller 9 is internally provided with a centrifugal compression volute exhaust port 17, the first shell casting 1 is provided with an inlet 18.

[0022] When the refrigeration three-stage compressor of the present application is in operation, gas is sucked in from the suction port 16, and is compressed by the centrifugal impeller 9 to achieve the first-stage compression. The first-stage compressed gas is discharged from the centrifugal compression volute exhaust port 17 into the intake port 18, and the first-stage compressed gas sucked in by the intake port 18 cools the motor body 2. Then, the first-stage compressed gas is further compressed by the rotor body 7 and the first male screw rotor 5, and is compressed into second-stage compressed gas. The second-stage compressed gas is compressed by the second male screw rotor 14 and the second female screw rotor 15 when entering the third housing casting 12, and the third-stage compression is completed. The third compressed gas obtained after the third-stage compression is discharged from the gas outlet 19. The third-stage compression can achieve high-pressure-ratio gas, so that the energy-saving effect of the three-stage compressor is significantly improved in the application of ultra-low temperature and high pressure ratio.

[0023] The intake port 18 and the centrifugal compression volute exhaust port 17 form a gas suction channel, and the second bearing seat casting 13 is provided with a gas outlet 19.

[0024] The first male screw rotor 5 and the first female screw rotor 6 are arranged in parallel in the second housing casting 4, and are adapted to each other.

[0025] The second male screw rotor 14 and the second female screw rotor 15 are arranged in parallel in the third housing casting 12, and are adapted to each other.

[0026] The first bearing body 20 and the second bearing body 21 are arranged in the first bearing seat casting 10, one end of the first male screw rotor 5 extends into the first bearing seat casting 10 and is rotatably installed in the first bearing seat casting 10 through the first bearing body 20, and one end of the first female screw rotor 6 extends into the first bearing seat casting 10 and is rotatably installed in the first bearing seat casting 10 through the second bearing body 21.

[0027] The third bearing body 22 and the fourth bearing body 23 are arranged in the second bearing seat casting 13, one end of the second male screw rotor 14 extends into the second bearing seat casting 13 and is rotatably installed in the second bearing seat casting 13 through the third bearing body 22, and one end of the second female screw rotor 15 extends into the second bearing seat casting 13 and is rotatably installed in the second bearing seat casting 13 through the fourth bearing body 23.

[0028] The second housing casting 4 is provided with an opening 24 at the top, and the opening 24 is provided with a sealing plate 25 installed thereon by bolts.

[0029] The first shell casting 1 and the air suction cover casting 3 are connected with a supporting casting 26, the supporting casting 26 is internally provided with a supporting bearing 27, and the impeller shaft 8 is connected with the supporting casting 26 through the supporting bearing 27 inside the supporting casting 26. The supporting casting 26 can improve the stability of the impeller shaft 8, the rotor body 7, the first male screw rotor 5 and the second male screw rotor 14 when coaxial.

[0030] The outer side of the connecting position of the first male screw rotor 5 and the impeller shaft 8 is provided with a pressing nut 28, and the first male screw rotor 5 is connected with the rotor body 7 through the pressing nut 28. The pressing nut 28 can improve the coaxial connection stability of the first male screw rotor 5 and the rotor body 7.

[0031] The first male screw rotor 5 is connected with the rotor body 7 after extending to the inside of the rotor body 7 of the motor body 2, the impeller shaft 8 is connected with the first male screw rotor 5 at one end, the second male screw rotor 14 is connected with the first male screw rotor 5 at one end, the rotor body 7, the impeller shaft 8, the first male screw rotor 5 and the second male screw rotor 14 form a coaxial structure, and are all driven by the motor body 2, the three-stage compressor has a simple structure, can play the characteristics of the centrifugal impeller suitable for low pressure ratio and large displacement, and can play the characteristics of the screw rotor suitable for high pressure ratio working condition application, the three-stage compressor can increase the pressure ratio by 2-3 times, has remarkable refrigeration and energy saving effect in the high pressure ratio refrigeration field, and when the three-stage compressor is used as a whole structure in the refrigeration system, the operation principle is as convenient and simple as a single-stage compressor, and has wide application prospect.

[0032] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only to illustrate the principle of the present application, and various changes and improvements can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A three-stage refrigeration compressor, characterized in that: The invention comprises a first housing casting (1) and a motor body (2), wherein the motor body (2) is provided inside the first housing casting (1), an air intake cover casting (3) is provided on one side of the first housing casting (1), a second housing casting (4) is provided on the other side of the first housing casting (1), a first male screw rotor (5) and a first female screw rotor (6) are rotatably provided inside the second housing casting (4), one end of the first male screw rotor (5) extends to the inside of the rotor body (7) of the motor body (2) and is connected to the rotor body (7), an impeller shaft (8) is rotatably provided inside the air intake cover casting (3), one end of the impeller shaft (8) is connected to the first male screw rotor (5), and a centrifugal impeller (9) is installed on the impeller shaft (8), a first bearing seat casting (10) is provided on one side of the second housing casting (4), and the first shaft An exhaust end casting (11) is provided on one side of the support casting (10), a third housing casting (12) is provided on one side of the exhaust end casting (11), a second bearing seat casting (13) is provided on one side of the third housing casting (12), a second male screw rotor (14) and a second female screw rotor (15) are rotatably provided inside the third housing casting (12), one end of the second male screw rotor (14) is connected to the first male screw rotor (5), the rotor body (7), the impeller shaft (8), the first male screw rotor (5) and the second male screw rotor (14) form a coaxial structure, an air intake (16) is provided on one end of the air intake cover casting (3), a centrifugal compression volute exhaust port (17) is provided inside the air intake cover casting (3) at the position of the centrifugal impeller (9), and an air inlet (18) is provided on the first housing casting (1).

2. A three-stage refrigeration compressor according to claim 1, characterized in that: An air intake passage is formed between the air inlet (18) and the centrifugal compression volute exhaust port (17), and an air outlet (19) is provided on the second bearing seat casting (13).

3. The three-stage refrigeration compressor according to claim 1, characterized in that: The first male screw rotor (5) and the first female screw rotor (6) are arranged in parallel up and down inside the second shell casting (4), and the first male screw rotor (5) and the first female screw rotor (6) are adapted to each other.

4. The three-stage refrigeration compressor according to claim 1, characterized in that: The second male screw rotor (14) and the second female screw rotor (15) are arranged in parallel up and down inside the third shell casting (12), and the second male screw rotor (14) and the second female screw rotor (15) are adapted to each other.

5. The three-stage refrigeration compressor according to claim 3, characterized in that: A first bearing body (20) and a second bearing body (21) are provided inside the first bearing seat casting (10); one end of the first male screw rotor (5) extends into the interior of the first bearing seat casting (10) and is rotatably mounted inside the first bearing seat casting (10) through the first bearing body (20); and one end of the first female screw rotor (6) extends into the interior of the first bearing seat casting (10) and is rotatably mounted inside the first bearing seat casting (10) through the second bearing body (21).

6. A three-stage refrigeration compressor according to claim 4, characterized in that: A third bearing body (22) and a fourth bearing body (23) are provided inside the second bearing seat casting (13); one end of the second male screw rotor (14) extends into the interior of the second bearing seat casting (13) and is rotatably mounted inside the second bearing seat casting (13) through the third bearing body (22); and one end of the second female screw rotor (15) extends into the interior of the second bearing seat casting (13) and is rotatably mounted inside the second bearing seat casting (13) through the fourth bearing body (23).

7. The three-stage refrigeration compressor according to claim 1, characterized in that: The top of the second shell casting (4) is provided with an opening (24), and a sealing plate (25) is installed above the opening (24) via bolts.

8. The three-stage refrigeration compressor according to claim 1, characterized in that: A support casting (26) is provided at the connection between the first housing casting (1) and the air intake cover casting (3), a support bearing (27) is provided inside the support casting (26), and the impeller shaft (8) is connected to the support casting (26) through the support bearing (27) inside the support casting (26).

9. The three-stage refrigeration compressor according to claim 1, characterized in that: A clamping nut (28) is provided on the outer side of the connection position between the first male screw rotor (5) and the impeller shaft (8), and the first male screw rotor (5) is connected to the rotor body (7) through the clamping nut (28).

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