JP2003269390A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce the size and weight of a whole compressor by reducing the size and weight of a casing. <P>SOLUTION: This compressor 1 has the casing 2 formed by integrally connecting a plurality of diaphragms 4, 4, etc., arranging a series of stationary passage 15 inside, and arranging a fluid suction port and a delivery port 10 for communicating with the stationary passage 15, a rotary shaft 17 rotatably arranged in a central part of the casing 2, and impellers 18, 18, etc., arranged in a multistage shape on the rotary shaft 17, and respectively rotatably positioned in the stationary passage 15. Among the plurality of diaphragms 4, 4, etc., mutual outer peripheral parts of the adjacent diaphragms 4 and 4 are integrally joined by a joining means 13 such as welding. Since a space for inserting a through bolt into an outer peripheral part of the casing 2 is not required, the casing 2 is reduced in the size and weight by that extent, so that the whole compressor 1 is reduced in the size and weight. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor, and more particularly to a single-screw multistage compressor.

[0002]

2. Description of the Related Art An example of a single-shaft multi-stage compressor is shown in FIG. In other words, the compressor 41 has the casing 4
2 and a rotor 56 rotatably provided at the center of the casing 42.

The casing 42 includes a plurality of diaphragms 4.
Inner casing 43 formed by combining 4, 44, ...
And an outer casing 49 fitted on the outer side of the inner casing 43. A rotor 56 including a rotating shaft 57 and an impeller 58 is rotatably provided at the center of the inner casing 43. It has become.

In the inner casing 43, a plurality of plate-like diaphragms 44, 44 ... Are arranged in a line and the end faces of the adjacent diaphragms 44, 44 are brought into close contact with each other. In this state, a plurality of through bolts 51 are provided on the outer peripheral portion of each diaphragm 44. , 51
, And the plurality of diaphragms 44, 44 ... Are integrally fixed by tightening the through bolts 51, 51.

At the center of the inner casing 43, the rotary shaft 5
An insertion hole 54 for inserting 7 is provided. Each diaphragm 44 of the inner casing 43 is provided with a static flow passage 55, and the static flow passages 55, 55 of the adjacent diaphragms 44, 44 are communicated with each other through an insertion hole 54. Casing 4
A suction port (not shown) for fluid that penetrates the inside and outside of the casing 42 and communicates with the insertion hole 54 is provided at one axial end of 2, and the casing 42 is provided at the other axial end of the casing 42. A fluid discharge port 50 that penetrates the inside and the outside and communicates with the stationary flow channel 55 of the diaphragm 44 at the other end is provided.

The rotating shaft 57 is rotatably inserted into the insertion hole 54 at the center of the inner casing 43, and has bearings (not shown) provided at both axial ends of the casing 42. ) Is rotatably supported by. One end of the rotary shaft 57 is connected to an output shaft (not shown) of the prime mover, and is rotationally driven integrally with the output shaft when the prime mover operates.

Impellers 58 are integrally mounted on the rotary shaft 57 at predetermined intervals along the axial direction so that each impeller 58 is rotatably positioned in the stationary flow passage 55 of each diaphragm 44. Has become. Each impeller 5
8 is provided with a plurality of streamlined blades 61, 61 ...
The blades 61, 61 allow the insertion hole 54 and the stationary flow path 55 to be formed.
A plurality of streamline-shaped flow paths 62 that communicate with and are formed.

When the prime mover of the compressor 41 having the above-described structure is operated, the rotary shaft 57 and the multistage impeller 58 are rotationally driven integrally with the output shaft of the prime mover, and the casing 42 is sucked from the suction port of the casing 42. The fluid is sucked into the insertion hole 54. Then, the fluid sucked into the insertion hole 54 is discharged to the first-stage static flow passage 55 through the flow passage 62 of the first-stage impeller 58, and the pressure is increased. Through the insertion hole 54 to reach the second-stage impeller 58, and is discharged into the second-stage stationary flow passage 55 through the second-stage impeller 58 to be further pressurized,
It flows in the stationary flow channel 55 of the second stage and is inserted through the insertion hole 54 to
It reaches the impeller 58 at the stage and is gradually increased in pressure in this way through the impeller 58 and the stationary flow path 55, and becomes a predetermined pressure and is discharged from the discharge port 50 of the casing 42 to the outside of the casing 42.

[0009]

However, in the compressor 41 having the above-mentioned structure, the plurality of diaphragms 4 forming the inner casing 43 of the casing 42 are provided.
, 44 are inserted into the outer peripheral portion of each diaphragm 44 by a plurality of through bolts 51, 51, ...
The elasticity of 51 ... Absorbs the expanding force acting between the adjacent diaphragms 44, 44. Therefore, an extra space for inserting the through bolts 51, 51 ... Is required in the outer peripheral side portion of the stationary flow channel 55 of each diaphragm 44, and the diaphragm 4 is provided only in that space.
4 and the casing 42 are increased in size, the entire compressor 41 is increased in size, and the weight is increased.

The present invention has been made in view of the above-described conventional problems, and eliminates the space for inserting the through bolt in the outer peripheral side portion of the stationary flow path of each diaphragm, thereby eliminating the need for each diaphragm. To make the casing smaller and lighter, which makes the casing smaller and lighter,
An object of the present invention is to provide a compressor that can be reduced in weight.

[0011]

The present invention employs the following means in order to solve the above problems. That is, in the invention according to claim 1, a plurality of diaphragms are integrally connected, a series of static flow paths are provided inside, and a suction port and a discharge port of fluid communicating with the static flow paths are provided. A casing, a rotary shaft rotatably provided in the center of the casing, and an impeller that is provided in multiple stages along the axial direction of the rotary shaft and is rotatably positioned in the stationary flow path. A compressor provided with the plurality of diaphragms, characterized in that the outer peripheral portions of adjacent diaphragms are integrally joined by a joining means. According to the compressor of the present invention, since the outer peripheral portions of the diaphragms adjacent to each other among the plurality of diaphragms are integrally joined by the joining means, a space for inserting the through bolt in the outer peripheral portion of each diaphragm is provided. Is unnecessary. Therefore, since each diaphragm can be made smaller and lighter by that amount,
The entire casing can be reduced in size and weight, and the entire compressor can be reduced in size and weight.

According to a second aspect of the present invention, in the compressor according to the first aspect, the joining means is a weld that integrally joins the outer peripheral portions of the adjacent diaphragms. According to the compressor of the present invention, the outer peripheral portions of the adjacent diaphragms of the plurality of diaphragms are integrally joined by welding, so that a space for inserting the through bolt in the outer peripheral portion of each diaphragm is unnecessary. Become. Therefore, since the respective diaphragms can be made smaller and lighter by that amount, the entire casing can be made smaller and lighter, and the entire compressor can be made smaller and lighter.

The invention according to claim 3 is the compressor according to claim 1, wherein the joining means is a screw fastening body that integrally fastens the outer peripheral portions of the adjacent diaphragms. . According to the compressor of the present invention, the outer peripheral portions of the adjacent diaphragms of the plurality of diaphragms are integrally fastened by the screw fastening body, so there is a space for inserting the through bolts in the outer peripheral portions of the respective diaphragms. It becomes unnecessary. Therefore, since the respective diaphragms can be made smaller and lighter by that amount, the entire casing can be made smaller and lighter, and the entire compressor can be made smaller and lighter.

The invention according to claim 4 is the compressor according to claim 1, wherein the joining means is a fitting member fitted between the outer peripheral portions of the adjacent diaphragms. . According to the compressor of the present invention, the outer peripheral portions of the adjacent diaphragms of the plurality of diaphragms are integrally joined by fitting the fitting member.
A space for inserting the through bolt on the outer peripheral portion of each diaphragm is unnecessary. Therefore, since the respective diaphragms can be made smaller and lighter by that amount, the entire casing can be made smaller and lighter, and the entire compressor can be made smaller and lighter.

A fifth aspect of the present invention is the compressor according to any one of the first to fourth aspects, wherein a portion of the joint portion formed by the joint means facing the stationary flow path is covered with a cover. It is characterized by According to the compressor of the present invention, when the outer peripheral portions of the adjacent diaphragms are joined by the joining means, the portion of the joined portion by the joining means facing the stationary flow path is covered with the cover. ,
The flow path resistance in the stationary flow path can be reduced.

[0016] The invention according to claim 6 is the compressor according to any one of claims 1 to 5, wherein the outer periphery of the adjacent diaphragm located at a portion corresponding to the discharge port of the plurality of diaphragms. The parts are fastened with a screw fastening body so that both diaphragms can be relatively moved in the axial direction, and the screw fastening body is attached between the screw fastening body and one diaphragm in a direction in which the fastening force increases. It is characterized in that an elastic member for biasing is interposed. According to the compressor of the present invention, when a pressure that spreads between adjacent diaphragms located at the portion corresponding to the discharge port is applied between them, the pressure is absorbed by the urging force of the elastic member. Will be.

The invention according to claim 7 is the compressor according to claim 6, wherein the elastic member is a spring. According to the compressor of the present invention, when a pressure that spreads between adjacent diaphragms located at a portion corresponding to the discharge port is applied between them, the pressure is absorbed by the elastic force of the spring. It will be.

The invention according to claim 8 is the compressor according to claim 6, wherein the elastic member is a rubber-like elastic body. According to the compressor of the present invention, when a pressure that spreads between the outer peripheral portions of the adjacent diaphragms located at the portion corresponding to the discharge port acts between them, the pressure is generated by the elastic force of the rubber-like elastic body. Will be absorbed.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention shown in the drawings will be described below. 1 and 2 show a first embodiment of a compressor according to the present invention. The compressor 1 includes a casing 2, a rotary shaft 17 rotatably provided on the casing 2, and an impeller 18. And a rotor 16 composed of

The casing 2 includes a plurality of diaphragms 4,
It is composed of an inner casing 3 formed by combining 4, ..., And an outer casing 9 fitted to the outside of the inner casing 3, and a rotor 16 is rotatably provided at the center of the inner casing 3. It is like this.

In the inner casing 3, a plurality of plate-like diaphragms 4 are arranged in a line so that axial end faces of the adjacent diaphragms 4 and 4 are brought into close contact with each other, and in this state, the outer peripheral portions of the adjacent diaphragms 4 and 4 are separated from each other. The joining means 13 is integrally joined by welding (arc welding, gas welding, resistance welding, etc.).

In this case, the outer peripheral portions of the adjacent diaphragms 4 and 4 may be welded at a plurality of positions at predetermined intervals in the circumferential direction, or may be welded over the entire circumference.
In addition, an escape groove 7 having a U-shaped cross section is provided over the entire circumference at an axially outer portion of the joint portion 5 of each diaphragm 4, and the strain generated in each diaphragm 4 at the time of welding is escaped by this escape groove 7. You may do it. It should be noted that the relief groove 7 need not be provided if the strain generated during welding has no effect.

Of the joint portions 5 on the outer peripheral portion of the plurality of diaphragms 4, 4, ..., The joint portion 5 located at a portion corresponding to a discharge port 10 of the casing 2 described later is provided with a thin plate-like cover provided on the outer side thereof. 8 covered with this cover 8
This reduces the resistance of the fluid flowing through that portion. Further, between the outer peripheral portions of the adjacent diaphragms 4 and 4 located at a portion corresponding to a discharge port 10 which will be described later, a bolt 11 which is a screw fastening body is fastened so as to be finely movable in the axial direction, and a head portion of the bolt 11 is provided. An elastic member 12 is interposed between the adjacent diaphragm 4 and the diaphragm 4, and the elastic member 12 presses the bolt 11 in a direction to increase the fastening force. Then, when the fluid pressure acts in the stationary flow path 15 to be described later and a force that spreads between the outer peripheral portions of the adjacent diaphragms 4 and 4 acts, the elastic member 12 elastically deforms and acts on the bolt 11. The tensile force is relaxed and the bolt 11 is prevented from being damaged. The elastic member 12 may be a spring, a rubber-like elastic body, or the like, but any other material may be used as long as it has the same function.

At the center of the inner casing 3, the rotary shaft 1
An insertion hole 14 for inserting 7 is provided so as to penetrate in the axial direction. In addition, each diaphragm 4 of the inner casing 3 has a stationary flow path 15
And the static flow path 1 of the adjacent diaphragms 4, 4
5 and 15 communicate with each other through the insertion hole 14. A suction port (not shown) for fluid that penetrates the inside and outside of the casing 2 and communicates with the insertion hole 14 is provided at one axial end of the casing 2, and the casing is provided at the other axial end of the casing 2. 2 Fluid discharge port 10 penetrating inside and outside and communicating with stationary flow path 15 of diaphragm 4 at the other end
Is provided.

The rotating shaft 17 is rotatably inserted in the insertion hole 14 at the center of the inner casing 3.
The casing 2 is rotatably supported by bearings (not shown) provided at both ends of the casing 2 in the axial direction. One end of the rotary shaft 17 is connected to an output shaft (not shown) of the prime mover, and is rotationally driven integrally with the output shaft when the prime mover operates.

Impellers 18 are integrally mounted on the rotating shaft 17 in a plurality of stages at predetermined intervals along the axial direction, and each impeller 18 is rotatably positioned in the stationary flow passage 15 of each diaphragm 4. Has become. Each impeller 18
Is an annular hub 19 fixed to the rotating shaft 17, and the hub 1
9, a disc-shaped main plate 20 that is integrally provided on the outer peripheral side, and a plurality of streamlined blades 21 that are integrally provided on one side surface of the main plate 20 at predetermined intervals in the circumferential direction. There is. Streamline-shaped fluid channels 22 are formed between the adjacent blades 21 and 21 and the main plate 20, respectively, and each channel 22 has a suction port 23 at one end communicating with the insertion hole 14 and a channel at the other end. The discharge port 24 communicates with the stationary flow path 15.

A labyrinth seal 25 is provided between the outer peripheral surface of the blade 21 of each impeller 18 and the inner peripheral surface of the stationary flow path 15 of each diaphragm 4, and the labyrinth seal 25 adjoins each other. The fluid can be efficiently transported from the stationary flow channel 15 of one diaphragm 4 to the stationary flow channel 15 of the other diaphragm 4 via the impeller 18.

Hub 1 of adjacent impellers 18, 18
An annular sleeve 26 is mounted between 9 and 19, and a labyrinth seal 27 is provided between the outer peripheral surface of the sleeve 26 and the inner peripheral surface of the insertion hole 14 of each diaphragm 4 to seal them. It is designed to be used.

When the prime mover is operated, the rotary shaft 17 and the multistage impeller 18 are rotationally driven integrally with the output shaft of the prime mover, and the fluid is sucked from the suction port of the casing 2 into the insertion hole 14 of the casing 2. And the insertion hole 1
The fluid sucked in 4 is sucked into the flow path 22 from the suction port 23 of the impeller 18 of the first stage, flows through the flow path 22 and enters the stationary flow channel 15 of the first stage from the discharge port 24. It is discharged and increased in pressure, flows through the stationary flow passage 15 of the first stage, reaches the impeller 18 of the second stage through the insertion hole 14, and is sucked into the flow passage 22 from the suction port 23 of the impeller 18 of the second stage. Rarely, it flows through the flow passage 22 and is discharged from the discharge port 24 into the stationary flow passage 15 of the second stage to be boosted in pressure, flows through the static flow passage 15 of the second stage, and reaches the impeller 18 of the third stage. As described above, the pressure is gradually increased through the impeller 18 and the stationary flow path 15 in each stage, and the pressure is raised to a predetermined pressure, and the gas is discharged from the discharge port 10 of the casing 2 to the outside of the casing 2.

In the compressor 1 according to this embodiment configured as described above, the plurality of diaphragms 4, 4, ... Constituting the inner casing 3 are adjacent to each other.
Since the outer peripheral portions of the diaphragms 4 are integrally joined by welding which is the joining means 13, there is no need for a space for inserting a through bolt in the outer peripheral portion of each diaphragm 4. Therefore, the respective diaphragms 4 can be reduced in size and weight accordingly, so that the casing 2 can be reduced in size and weight, and the entire compressor 1 can be reduced in size and weight.

A second embodiment of the compressor according to the present invention is shown in FIG. 3, in which the compressor 1 is provided with a plurality of diaphragms 4, 4, ... The joining means 13 is provided between the outer peripheral portions of the diaphragms 4,
The screw fastening body 13 is integrally joined, and other configurations are the same as those shown in the first embodiment.

That is, in this embodiment, recesses 28 are provided at a plurality of locations at predetermined intervals in the circumferential direction on the outer peripheral portion of one of the diaphragms 4 and 4 adjacent to each other, and each of the recesses 28 is provided with a recess. A burrow hole 29 penetrating the recess 28 in the direction of the other diaphragm 4 is provided, a screw hole 30 having a predetermined depth is provided in a portion of the other diaphragm 4 corresponding to the burrow hole 29, and the screw fastening body 13 is used. A certain bolt 13 is inserted from each concave portion 28 of one diaphragm 4 through a fool hole 29 and screwed into a screw hole 30 of the other diaphragm 4 so as to be tightened.
The outer peripheral portions of No. 4 are integrally joined.

Also in the compressor 1 shown in this embodiment, as in the case of the first embodiment,
A plurality of diaphragms 4, 4, which constitute the inner casing 3,
Since the outer peripheral portions of the diaphragms 4 and 4 adjacent to each other are integrally fastened by the screw fastening body 13 which is the joining means 13, there is no need for a space for inserting a through bolt in the outer peripheral portion of each diaphragm 4. Becomes Therefore, the respective diaphragms 4 can be reduced in size and weight accordingly, so that the casing 2 can be reduced in size and weight, and the entire compressor 1 can be reduced in size and weight.

Also in this embodiment, a thin plate is formed on the outer side of the joint portion 5 located at the portion corresponding to the discharge port 10 of the casing 2 among the joint portions 5 on the outer peripheral portions of the plurality of diaphragms 4, 4 ,. A cover (not shown) may be provided to reduce the resistance of the fluid flowing through the cover. In addition, the discharge port 10 of the casing 2
Between the outer peripheral portions of the adjacent diaphragms 4 and 4 located at the portion corresponding to, are fastened by a bolt 11 which is a screw fastening body 11 so as to be finely movable in the axial direction.
An elastic member 12 is interposed between the head of the head and one of the adjacent diaphragms 4, and the elastic force of the elastic member 12 presses the bolt 11 in a direction to increase the fastening force.

FIG. 4 shows a third embodiment of the compressor according to the present invention. In the compressor 1, a plurality of diaphragms 4, 4, ... Constituting the inner casing 3 are adjacent to each other. The outer peripheral portions 4 and 4 are integrally joined by a fitting member 13 which is a joining means 13, and the other structures are the same as those shown in the first embodiment.

That is, in this embodiment, the fitting grooves 31 are provided in the outer peripheral portions of the adjacent diaphragms 4 and 4, respectively, and the fitting members 13 each having a U-shaped cross section are fitted into the fitting grooves 31. Put on the adjacent diaphragm 4,
The outer peripheral portions of No. 4 are integrally joined.

Also, in the compressor 1 shown in this embodiment, as in the case of the first embodiment,
A plurality of diaphragms 4, 4, which constitute the inner casing 3,
Since the outer peripheral portions of the diaphragms 4, 4 adjacent to each other are integrally joined by the fitting member 13 which is the joining means 13, there is no need for a space for inserting a through bolt in the outer peripheral portion of each diaphragm 4. Becomes Therefore, the respective diaphragms 4 can be reduced in size and weight accordingly, and the casing 2 can be reduced in size and weight.
The compressor 1 as a whole can be reduced in size and weight.

Also in this embodiment, a thin plate is provided on the outer side of the joint portion 5 located at the portion corresponding to the discharge port 10 of the casing 2 among the joint portions 5 on the outer peripheral portions of the plurality of diaphragms 4, 4 ,. A cover (not shown) may be provided to reduce the resistance of the fluid flowing through the cover. In addition, the discharge port 10 of the casing 2
Between the outer peripheral portions of the adjacent diaphragms 4 and 4 located at the portion corresponding to, are fastened by a bolt 11 which is a screw fastening body 11 so as to be finely movable in the axial direction.
An elastic member 12 is interposed between the head of the and the adjacent diaphragm 4 and the elastic force of the elastic member 12 presses the bolt 11 in a direction to increase the fastening force.

[0039]

As described above, according to the compressor described in claim 1 of the present invention, the outer peripheral portions of the adjacent diaphragms of the plurality of diaphragms constituting the casing are integrally joined by the joining means. Will be joined,
A space for inserting the through bolt on the outer peripheral portion of each diaphragm is unnecessary. Therefore, since the respective diaphragms can be made smaller and lighter by that amount, the entire casing can be made smaller and lighter, and the entire compressor can be made smaller and lighter.

Further, according to the compressor of the second aspect of the present invention, the outer peripheral portions of the adjacent diaphragms of the plurality of diaphragms constituting the casing are integrally joined by welding which is a joining means. Therefore, there is no need for a space for inserting the through bolt in the outer peripheral portion of each diaphragm. Therefore, the size of each diaphragm is reduced accordingly.
Since the weight can be reduced, the entire casing is small,
The weight can be reduced, and the entire compressor can be reduced in size and weight.

Further, according to the compressor of claim 3 of the present invention, the outer peripheral portions of the adjacent diaphragms of the plurality of diaphragms constituting the casing are integrally fastened by the screw fastening body. A space for inserting the through bolt on the outer peripheral portion of each diaphragm is unnecessary. Therefore, since the respective diaphragms can be made smaller and lighter by that amount, the entire casing can be made smaller and lighter, and the entire compressor can be made smaller and lighter.

Further, according to the compressor of the fourth aspect of the present invention, the outer peripheral portions of the adjacent diaphragms of the plurality of diaphragms forming the casing are integrally joined by fitting the fitting member. Therefore, there is no need for a space for inserting the through bolt in the outer peripheral portion of each diaphragm. Therefore, since the respective diaphragms can be made smaller and lighter by that amount, the entire casing can be made smaller and lighter, and the entire compressor can be made smaller and lighter.

Further, according to the compressor of the fifth aspect of the present invention, when the outer peripheral portions of the diaphragms adjacent to each other of the plurality of diaphragms constituting the casing are joined by the joining means, the joining portions are joined. Since the portion facing the stationary flow channel is covered with the cover, the flow channel resistance in the stationary flow channel can be reduced, and the fluid can be efficiently transported.

Further, according to the compressor of the sixth aspect of the present invention, in the case where a pressure that spreads between them acts between the outer peripheral portions of the adjacent diaphragms located at the portion corresponding to the discharge port of the casing. In addition, since the pressure is absorbed by the elastic force of the elastic member, the tensile force applied to the screw fastening body can be relaxed and the screw fastening body can be prevented from being damaged.

Further, according to the compressor of claim 7 of the present invention, when a pressure that spreads between the outer peripheral portions of the adjacent diaphragms located at the portion corresponding to the discharge port is applied, Since the pressure is absorbed by the elastic force of the spring, the tensile force applied to the screw fastening body can be relaxed and the screw fastening body can be prevented from being damaged.

Further, according to the compressor of claim 8 of the present invention, when a pressure that spreads between them acts between the outer peripheral portions of the adjacent diaphragms located at the portion corresponding to the discharge port, Since the pressure is absorbed by the elastic force of the rubber-like elastic body, the tensile force applied to the screw fastening body can be relaxed and the screw fastening body can be prevented from being damaged.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional view showing a first embodiment of a compressor according to the present invention.

FIG. 2 is a partially enlarged view of what is shown in FIG.

FIG. 3 is a partially enlarged cross-sectional view showing a second embodiment of the compressor according to the present invention.

FIG. 4 is a partially enlarged cross-sectional view showing a third embodiment of the compressor according to the present invention.

FIG. 5 is a schematic cross-sectional view showing an example of a conventional compressor.

[Explanation of symbols]

1 compressor 2 casing 4 diaphragm 8 covers 10 outlets 11 screw fastening body 12 Elastic member 13 Joining means 15 static flow path 17 rotation axis 18 impeller

Claims (8)

[Claims] 1. A casing formed by integrally connecting a plurality of diaphragms, having a series of static flow passages therein, and a fluid suction port and a discharge port communicating with the static flow passages; A compressor provided with a rotating shaft rotatably provided in a central portion of a casing, and an impeller provided in multiple stages along the axial direction of the rotating shaft and each of which is rotatably positioned in the stationary flow path. A compressor characterized in that the outer peripheral portions of adjacent diaphragms of the plurality of diaphragms are integrally joined by a joining means. 2. The compressor according to claim 1, wherein the joining means is a weld that integrally joins outer peripheral portions of adjacent diaphragms. 3. The compressor according to claim 1, wherein the joining means is a screw fastening body that integrally fastens the outer peripheral portions of adjacent diaphragms. 4. The compressor according to claim 1, wherein the joining means is a fitting member fitted between outer peripheral portions of adjacent diaphragms. 5. The compressor according to claim 1, wherein a portion of the joint portion formed by the joint means facing the stationary flow path is covered with a cover. Machine. 6. The compressor according to claim 1, wherein among the plurality of diaphragms, a screw fastening member is provided between outer peripheral portions of adjacent diaphragms located at portions corresponding to the discharge ports. And the two diaphragms are relatively movable in the axial direction, and an elastic member is provided between the screw fastening body and one of the diaphragms to urge the screw fastening body in a direction in which the fastening force increases. A compressor characterized by being mounted. 7. The compressor according to claim 6, wherein the elastic member is a spring. 8. The compressor according to claim 6, wherein the elastic member is a rubber-like elastic body.