JP2010286217A - Accumulator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an accumulator which avoids the resonance of an insert pipe in every operating situation of a compressors. <P>SOLUTION: The accumulator 1 is disposed near the compressor. The accumulator 1 includes a casing 2 and a pipe member 3. The casing 2 has an inlet and an outlet. The pipe member 3 is inserted into the casing 2 through the outlet of the casing 2 and extends upwardly within the casing 2. The pipe member 3 includes an internal pipe 11 and a connecting pipe 12. The internal pipe 11 is stored within the casing 2 and extends vertically therein. The connecting pipe 12 communicates with the lower end of the internal pipe 11, and extends out of the casing 2 through the outlet of the casing 2 while connecting with the inner circumferential part of the outlet of the casing 2. The inner pipe 11 is lower in rigidity than the connecting pipe 12. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an accumulator that is installed near a compressor and performs gas-liquid separation of a compressed medium.

  An air conditioner that has been generally used conventionally is equipped with a compressor that compresses a refrigerant, and an accumulator is installed in the vicinity of the compressor for gas-liquid separation of the refrigerant.

  In the compressor having such an accumulator, the insertion tube inserted into the accumulator is inserted to the upper part of the accumulator space for gas-liquid separation of the refrigerant.

  The insertion tube has a lower end connected to a joint tube of the compressor body, but the upper end is a free end that is not fixed, and has cantilever vibration characteristics. For this reason, when the natural vibration frequency of the insertion tube matches the order component frequency of the compressor rotation speed, the insertion tube may resonate and the compressor radiation noise may increase.

  Therefore, in order to prevent resonance of the insertion tube inside the accumulator, Patent Document 1 (Japanese Patent Laid-Open No. 2001-41163) describes a structure in which a bellows-like fold is formed in the middle of the insertion tube inside the accumulator, A structure using a thick insertion tube having a large thickness and a structure in which a midway of the insertion tube is connected by a rubber pipe are used.

  As described above, in the conventional accumulator structure, if the natural vibration frequency of the insertion tube matches the order component frequency of the compressor rotation speed, the insertion tube inside the accumulator resonates and the compressor radiated sound increases. It has become.

  Further, as in the structure described in Patent Document 1, in order to suppress the resonance of the accumulator, a structure in which a bellows-like fold is formed in the middle of the insertion pipe, a structure using a large mass insertion pipe, and a rubber pipe in the middle of the insertion pipe Even if it has the structure inherited in, it only reduces the natural frequency of the insertion tube itself, and depending on the operating conditions of the compressor, for example, the accumulator resonance occurs while the compressor speed is increased at the start There is a problem.

  Further, in the case of a structure using a large-mass insertion tube, the upper portion of the insertion tube is heavy and is intentionally shaken, which may cause a problem in durability of the insertion tube.

  An object of the present invention is to provide an accumulator capable of avoiding resonance of an insertion pipe even in all operating situations of a compressor.

  The accumulator of 1st invention is an accumulator arrange | positioned in the vicinity of a compressor. The accumulator includes a casing and a pipe member. The casing has an inlet and an outlet. The pipe member has a joint pipe part and an internal pipe part, and the joint pipe part extends upward in the casing. An internal piping part is accommodated in the inside of a casing, and is extended in an up-down direction. The connecting pipe portion communicates with the lower end of the inner piping portion, extends to the outside of the casing through the outlet of the casing, and is connected to the inner peripheral portion of the outlet of the casing. The internal piping part has lower rigidity than the combined piping part.

  Here, among the pipe members extending inside the casing, the rigidity of the internal pipe part is made lower than that of the coupled pipe part so that the main member constituting the vibration system is the coupled pipe part. The number can be greatly shifted to the high frequency side, and the pipe member can be prevented from resonating with the compressor vibration.

  The accumulator of 2nd invention is the accumulator of 1st invention, Comprising: The internal piping part is manufactured with the synthetic resin.

  Here, since the internal piping portion is made of a synthetic resin, it has a lighter and higher vibration absorbing function than a metal pipe, and is excellent in oil resistance.

  The accumulator of the third invention is the accumulator of the first invention or the second invention, and the internal piping portion and the coupling piping portion are coupled in the vicinity of the casing bottom.

  Here, since the internal pipe part and the joint pipe part are joined in the vicinity of the casing bottom, most of the pipe members inside the casing become low-rigidity internal pipe parts, and the resonance frequency can be shifted more greatly. Further, it is possible to more effectively prevent the pipe member from resonating with the compressor vibration.

  The accumulator according to a fourth aspect of the present invention is the accumulator according to any one of the first to third aspects of the present invention, wherein 50 to 80% of the height of the pipe member is constituted by an internal piping portion.

  Here, since 50 to 80% of the height of the pipe member is constituted by the internal pipe part, the joint pipe part having relatively higher rigidity than the internal pipe part is shortened to 20% of the height of the pipe member. be able to. As a result, the resonance frequency can be shifted greatly and separated from the order component frequency of the compressor rotation speed in any operating condition of the compressor, and the pipe member can be reliably prevented from resonating. .

  An accumulator according to a fifth aspect of the present invention is the accumulator according to any one of the first to fourth aspects of the present invention, wherein the coupling pipe portion is coupled to the internal piping portion by pushing the upper end portion into the internal piping portion.

  Here, the joint pipe part is joined to the internal pipe part by pushing the upper end portion into the internal pipe part, so that the internal pipe part and the joint pipe part can be easily and firmly joined. is there.

  According to the first invention, the natural frequency of the pipe member can be largely shifted to the high frequency side, and the pipe member can be prevented from resonating with the compressor vibration.

  According to the second aspect of the present invention, it has a light and high vibration absorbing function as compared with the metal pipe, and is excellent in oil resistance.

  According to the third invention, the resonance frequency can be shifted more greatly, and the pipe member can be more effectively prevented from resonating with the compressor vibration.

  According to the fourth aspect of the present invention, it is possible to reliably shift the resonance frequency away from the order component frequency of the compressor rotation speed in any operating state of the compressor, and reliably prevent the pipe member from resonating. can do.

  According to the fifth aspect of the present invention, it is possible to easily and firmly bond between the internal piping portion and the coupling piping portion.

The longitudinal cross-sectional view of the accumulator concerning embodiment of this invention. The longitudinal cross-sectional view of the compressor which attached the accumulator of FIG. The expanded sectional view of the insertion tube of FIG. AA sectional drawing which shows the cylinder inside of the compressor of FIG.

  Next, an embodiment of the accumulator of the present invention will be described with reference to the drawings.

Embodiment
Next, an embodiment of the accumulator 1 of the present invention and a compressor 101 having the accumulator 1 will be described with reference to the drawings.

<Configuration of accumulator 1>
The accumulator 1 shown in FIG. 1 includes a casing 2, an outlet-side insertion tube 3, an inlet tube 4, a filter 5, a holder 6, and a baffle 7 as main components. The insertion tube 3 will be described in detail in the next item.

  The casing 2 is formed of a metal sealed container in which a dome-shaped upper portion 10 and a bottomed cylindrical lower portion 9 are hermetically coupled. The casing 2 has an inlet 2a and an outlet 2b through which refrigerant composed of R410A that is a compression medium of the compressor 101 enters and exits.

  The inlet pipe 4 is a pipe attached to the inlet 2a of the casing 2, and is connected to the piping of the refrigerant circuit.

  The filter 5 is a member that removes dust and the like in the refrigerant by filtering the refrigerant introduced from the inlet 2a of the casing 2, and is manufactured from a metal mesh or the like.

  The holder 6 is a metal cylinder for fixing the filter 5 to a predetermined position inside the casing 2.

  The baffle 7 is a member that prevents the liquid component of the refrigerant introduced from the inlet 2a of the casing 2 from being directly sucked into the insertion tube 3, and is manufactured by processing a metal thin plate.

  The reinforcing plate 8 is a member that increases the rigidity of the casing 2, and an opening 8 a that is larger than the outer diameter of the insertion tube 3 is formed in the center of the reinforcing plate 8. The distal end portion 3a of the insertion tube 3 protrudes above the reinforcing plate 8 through the opening 8a.

<Configuration of insertion tube 3>
The insertion tube 3 is a pipe extending upward in the casing 2. The insertion tube 3 of this embodiment corresponds to the “tube member” of the present invention.

  More specifically, as shown in FIGS. 1 and 3, the insertion tube 3 has an internal piping part 11 and a coupling piping part 12.

  The internal piping part 11 is a pipe that is accommodated in the casing 2 and extends in the vertical direction.

  The coupling pipe portion 12 communicates with the lower end of the internal piping portion 11, extends to the outside of the casing 2 through the outlet of the casing 2, and is coupled to the inner peripheral portion of the outlet 2 b of the casing 2.

  The coupling pipe portion 12 is an L-shaped metal pipe such as steel having high pressure resistance that hermetically couples the accumulator 1 and the compressor 101. The coupling pipe portion 12 is airtightly fitted to the outlet 2b of the casing 2 and is also airtightly fitted to the suction pipe 119 (see FIG. 2) of the compressor 101.

  The internal piping part 11 is a soft synthetic resin pipe that is made of a synthetic resin having a lower rigidity than the joint piping part 12 and can be self-supporting. Thus, by shortening the 12-coupled piping portion having higher rigidity than the internal piping portion 11, the natural frequency of the entire insertion tube 3 is greatly shifted to the high frequency side, thereby preventing resonance of the insertion tube 3. It has a structure.

  Since the internal piping part 11 is manufactured from a synthetic resin, it has a light and high vibration absorption function, and is excellent in high strength and oil resistance. The internal piping part 11 is manufactured by fluorine resin, silicon resin, etc., such as Teflon (trademark), for example. Of these, fluororesins such as Teflon (registered trademark) and silicon resins are particularly preferable because of their excellent oil resistance and bending strength.

  The internal piping portion 11 and the coupling piping portion 12 are coupled in the vicinity of the bottom portion of the casing 2 (a position separated from the bottom portion of the casing 2 by a predetermined distance ΔH), and most of the insertion tube 3 inside the casing 2 is low. It is a rigid internal piping part 11.

  Furthermore, as FIG. 3 shows, 50 to 80% of the height H0 of the insertion pipe 3 is comprised by the height H1 of the internal piping part 11. As shown in FIG. Therefore, the height H <b> 2 of the coupling pipe part 12 having relatively higher rigidity than the internal pipe part 11 can be shortened to 20% of the height of the insertion pipe 3. As a result, the natural frequency of the entire insertion tube 3 can be greatly shifted to the high frequency side, and the resonance frequency can be reliably separated from the order component frequency of the compressor rotation speed in any operating condition of the compressor.

  Furthermore, the joint pipe part 12 is firmly joined to the internal pipe part 11 by pushing the upper end part into the internal pipe part 11.

<Compressor configuration>
Hereinafter, the structure of the compressor provided with the accumulator 1 of embodiment is demonstrated.

  As shown in FIG. 2, the swing compressor 101 according to the embodiment mainly includes a vertically long cylindrical hermetic dome-shaped casing 100, a swing compression mechanism unit 115, a drive motor 116, a suction pipe 119, a discharge pipe 120, And a terminal 195. Note that the accumulator 1 of the embodiment is attached to the casing 100 in the swing compressor 101. Hereinafter, the components of the swing compressor 101 will be described in detail.

[Details of swing compressor components]
(1) Casing The casing 100 of the swing compressor 101 mainly accommodates a swing compression mechanism 115 that compresses a gas refrigerant made of R410A and a drive motor 116 that is disposed above the swing compression mechanism 115. ing. The swing compression mechanism 115 and the drive motor 116 are connected by a crankshaft 117 that is disposed so as to extend in the vertical direction in the casing 100.

  A bracket 154 for fixing the casing 2 of the accumulator 1 is provided on the side surface of the casing 100.

(2) Swing compression mechanism unit As shown in FIGS. 2 and 4, the swing compression mechanism unit 115 mainly includes a crankshaft 117, a piston 121, a bush 122, a front head 123, and a cylinder block 124. And the rear head 125. The swing compression mechanism 115 is immersed in the lubricating oil L stored at the bottom of the casing 100, and the lubricating oil L is supplied to the swing compression mechanism 115 by differential pressure. Hereinafter, the components of the swing compression mechanism 115 will be described in detail.

a) Cylinder Block As shown in FIGS. 2 and 4, the cylinder block 124 is formed with a cylinder hole 124a, a suction hole 124b, a discharge passage 124c, a bush accommodation hole 124d, a blade accommodation hole 124e, and a heat insulation groove 124f. ing. As shown in FIGS. 2 and 4, the cylinder hole 124 a is a cylindrical hole penetrating along the plate thickness direction. The suction hole 124b extends from the outer peripheral wall surface to the cylinder hole 124a. The discharge passage 124c is formed by cutting out a part of the inner peripheral side of the cylindrical portion that forms the cylinder hole 124a. The bush receiving hole 124d is a hole that penetrates along the plate thickness direction, and is located between the suction hole 124b and the discharge passage 124c when viewed along the plate thickness direction. The blade accommodation hole 124e is a hole that penetrates along the plate thickness direction and communicates with the bush accommodation hole 124d.

  In the cylinder block 124, the eccentric shaft portion 117a of the crankshaft 117 and the rotor portion 121a of the piston 121 are accommodated in the cylinder hole 124a, and the blade portion 121b and the bush 122 of the piston 121 are accommodated in the bush accommodation hole 124d. In a state where the blade portion 121b of the piston 121 is accommodated in the accommodation hole 124e, the discharge head 124c is fitted to the front head 123 and the rear head 125 so as to face the front head 123 side. As a result, a cylinder chamber Rc1 is formed in the swing compression mechanism 115, and the cylinder chamber Rc1 is partitioned by the piston 121 into a suction chamber communicating with the suction hole 124b and a discharge chamber communicating with the discharge passage 124c. Become. In this state, the rotor part 121a is fitted into the eccentric shaft part 117a.

b) Crankshaft The crankshaft 117 is provided with an eccentric shaft portion 117a at one end. The crankshaft 117 is fixed to the rotor 152 of the drive motor 116 on the side where the eccentric shaft portion 117a is not provided.

c) Piston The piston 121 has a substantially cylindrical rotor part 121a and a blade part 121b protruding outward in the radial direction of the rotor part 121a. The rotor portion 121a is inserted into the cylinder hole 124a of the cylinder block 124 while being fitted to the eccentric shaft portion 117a of the crankshaft 117. Thereby, when the crankshaft 117 rotates, the rotor part 121a performs a revolving motion around the rotation axis of the crankshaft 117. The blade portion 121b is accommodated in the bush accommodation hole 124d and the blade accommodation hole 124e. As a result, the blade portion 121b swings and moves forward and backward along the longitudinal direction.

d) Bush The bush 122 is a substantially semi-cylindrical member, and is accommodated in the bush accommodation hole 124d so as to sandwich the blade portion 121b of the piston 121.

e) Front Head The front head 123 is a member that covers the discharge path 124 c side of the cylinder block 124 and is fitted to the casing 100. A bearing portion 123a is formed on the front head 123, and a crankshaft 117 is inserted into the bearing portion 123a. The front head 123 has an opening (not shown) for guiding the refrigerant gas flowing through the discharge passage 124 c formed in the cylinder block 124 to the discharge pipe 120. And this opening is obstruct | occluded or open | released by the discharge valve (not shown) for preventing the reverse flow of refrigerant gas.

f) Rear Head The rear head 125 covers the opposite side of the cylinder block 124 to the discharge path 124c side. A bearing portion 125a is formed in the rear head 125, and a crankshaft 117 is inserted into the bearing portion 125a.

(3) Drive Motor The drive motor 116 is a DC motor in the present embodiment, and mainly includes an annular stator 151 fixed to the inner wall surface of the casing 100 and a slight gap (air gap) inside the stator 151. And a rotor 152 rotatably accommodated with a passage).

  In the stator 151, a copper wire is wound around a tooth portion (not shown), and a coil end 153 is formed above and below. Further, on the outer peripheral surface of the stator 151, core cut portions (not shown) are formed which are formed at a plurality of positions from the upper end surface to the lower end surface of the stator 151 and at predetermined intervals in the circumferential direction. .

  A crankshaft 117 is fixed to the rotor 152 along the rotation axis.

(4) Suction Pipe The suction pipe 119 is provided so as to penetrate the casing 100, and one end is fitted into the suction hole 124 b formed in the cylinder block 124, and the other end is connected to the insertion pipe 3 of the accumulator 1. It is inserted.

(5) Discharge pipe The discharge pipe 120 is provided so as to penetrate the upper wall portion of the casing 100.

<Features of the embodiment>
(1)
In the accumulator 1 according to the embodiment, the internal piping portion 11 is manufactured from a synthetic resin having a lower rigidity than the joint piping portion 12. Thus, by shortening the 12-coupled piping portion having a relatively higher rigidity than the internal piping portion 11, the natural frequency of the entire insertion tube 3 is greatly shifted to the high frequency side, and the insertion tube 3 is caused by the compressor vibration. Resonance can be prevented.

  Therefore, the compressor rotational speed is increased from the start of the compressor operation, and the order component frequency of the compressor rotational speed during the compressor operation (for example, the compressor rotational speed is It is possible to greatly shift the natural frequency of the insertion tube 3 to the high frequency side, exceeding the frequency of 1 to n-order components that can be generated during compressor operation such as 100 Hz, 200 Hz, and 400 Hz during 100 Hz operation. It is possible to reliably avoid resonance of the insertion tube 3.

  And since the upper part of the insertion pipe 3 is manufactured with the synthetic resin, since it becomes lighter than a metal pipe, durability of the whole insertion pipe 3 is also improved.

(2)
In the accumulator 1 according to the embodiment, since the internal piping portion 11 is made of a synthetic resin, it has a light and high vibration absorbing function as compared with a metal pipe, and is excellent in oil resistance and vibration absorption. Yes.

(3)
In the accumulator 1 of the embodiment, the internal piping portion 11 and the coupling piping portion 12 are coupled in the vicinity of the bottom portion of the casing 2. Therefore, most of the insertion pipe 3 in the casing 2 becomes the low-rigidity internal pipe section 11, and the resonance frequency can be shifted more greatly, and the insertion pipe 3 can be more effectively prevented from resonating with the compressor vibration. it can.

(4)
In the accumulator 1 according to the embodiment, 50 to 80% of the height of the insertion tube 3 is constituted by the internal piping portion 11. Therefore, it is possible to shorten the joint pipe part 12 having a relatively higher rigidity than the internal pipe part 11 to 20% of the height of the insertion pipe 3. As a result, the natural frequency of the entire insertion tube 3 can be greatly shifted to the high frequency side, and the resonance frequency can be reliably separated from the order component frequency of the compressor rotation speed in any operating situation of the compressor 101. It is possible to reliably prevent the insertion tube 3 from resonating.

(5)
Furthermore, in the accumulator 1 of the embodiment, the coupling pipe part 12 is coupled to the internal pipe part 11 by pushing the upper end part into the internal pipe part 11. Thereby, the internal piping part 11 and the coupling piping part 12 can be easily and firmly connected.

  The present invention can be applied to an accumulator having an upper end-free insertion tube inserted in a casing and a compressor including the accumulator. The accumulator of the present invention can be used by being attached to a swing compressor and other various types of compressors.

1 Accumulator 2 Casing 3 Insertion tube (tube member)
4 Inlet pipe 5 Filter 6 Holder 7 Baffle 8 Reinforcement plate 11 Internal piping section 12 Joint piping section

JP 2001-411163 A

Claims (5)

An accumulator (1) arranged in the vicinity of the compressor,
A casing (2) having an inlet and an outlet;
A pipe member (3) extending upward in the casing (2),
The pipe member (3)
An internal pipe part (11) housed in the casing (2) and extending in the vertical direction;
A coupling that communicates with the lower end of the internal pipe section (11), extends to the outside of the casing (2) through the outlet of the casing (2), and is coupled to the inner peripheral portion of the outlet of the casing (2) A piping part (12), and
The internal pipe part (11) is lower in rigidity than the joint pipe part (12).
Accumulator (1). The internal piping part (11) is made of a synthetic resin.
The accumulator (1) according to claim 1. The internal pipe part (11) and the joint pipe part (12) are joined in the vicinity of the bottom part of the casing (2).
The accumulator (1) according to claim 1 or 2. 50 to 80% of the height of the pipe member (3) is constituted by the internal pipe part (11).
The accumulator (1) according to any one of claims 1 to 3. The joint pipe part (12) is joined to the internal pipe part (11) by pushing the upper end part into the internal pipe part (11).
The accumulator (1) according to any one of claims 1 to 4.

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