JPS6073072A - Closed type compressor - Google Patents

Abstract

PURPOSE:To prevent the supercooling of a motor and as well to reduce liquid compression, by providing a first suction passage which cools a motor and a second suction passage which does not pass through the motor so that upon low load operation the second suction passage is made effective to suck coolant gas. CONSTITUTION:There are provided a first suction passage 33 having a suction port 32 formed in a motor cover 33 and communicated to a suction chamber 30 through a motor 4, and a second suction passage 34 secured to a discharge muffler 31 having one end communicated to the suction chamber 30 and the other end opposed to a suction ports 12 where the second passage 34 is formed with a pipe 38 serving as a suction port 37. Further, the suction ports 12, 37 are adapted to be opened and closed by a change-over valve made of, for example, a bimetal, a shape memory alloy, etc. With this arrangement, since the internal temperature upon low load running or starting of the compressor is low, the second suction passage 34 is opened to prevent sucked coolant from passing through the motor 4, and upon low load running the coolant is heated by the discharge muffler 31 to make the coolant difficult to become liquid.

Description

Detailed Description of the Invention [Technical Field of the Invention] The present invention relates to a new hermetic compressor, and in particular, during low-load operation 114 with a large liquid backlog, compression (operation) is stopped and fX etc. 1; 1 can reduce as much as possible the condensation of the refrigerant that occurs inside, thereby reducing damage due to liquid compression when restarting.
? (＜Possibility 4'') Closed type compression with little I (related to shallow).

[Technical background and problems of the invention t,',r JGeneral compression for freezing) When the main body of a compressor is stopped at a low temperature at 1-°C, the suction γ and It is known that a so-called stagnation phenomenon occurs in which the gas refrigerant shrinks by 11λ and the liquid refrigerant resides in the cylinder, etc.).

This stagnation phenomenon occurs during low load operation when the amount of liquid backlog is large.
■If you stop the rock bottom, it may occur. That is,
If the temperature of the compression element when the compressor is stopped is lower than the balance pressure saturation temperature of the refrigerant, the gas refrigerant may condense within the compression element. In particular, the compressor has a structure in which the gas refrigerant supplied into the cylinder is flowed from the lower chamber to the 17-F section to cool the suction refrigerant T-motor. In some cases, if low-load operation continues, the compression element is likely to be cooled down, often causing the above-mentioned stagnation phenomenon.

By the way, when this sleep-in phenomenon occurs, the compressed snoring compresses the liquid upon restart, causing damage to the intake valve, exhaust valve, shaft, bearing, etc.

[Object of the Invention 1] The present invention has been devised in view of the above-mentioned problems and to improve them as much as possible.

An object of the present invention is to provide a closed type compressor that reduces as much as possible the amount of refrigerant condensed inside the compressor even if the compressor is stopped during low-load operation, thereby preventing damage due to liquid compression when restarting the compressor. Provides compression (covering).

[Summary of the Invention] The present invention provides a single-layer air conditioner with a structure in which the refrigerant filled in the airtight case passes through the inside of Tanabata and is supplied into the cylinder. A new suction passage for the refrigerant that does not pass through the interior was formed, and a switching valve was installed for the suction passage to automatically switch between these two suction passages according to the temperature of the refrigerant. ).

[Embodiments of the Invention] A preferred embodiment of the present invention is attached below to the drawings. (Details) Ho.

Fig. 1 shows an internal body 2 of a hermetic compressor in which a part of a flume is supported in a sealed case. 1 A seven-piece 4 constituting the electric element 3 on one side and a reciprocating condenser 11 constituting the compression element 5 on the lower side are integrally formed.

FIG. 2 shows a side cross-section of the hermetic reciprocating compressor 7, which is taken along the line ■--■ in FIG.

As shown in FIGS. 1 and 2, a sash cover 9 is provided to form on the sweater 4 of each inner book 2. A suction port 12 is formed in the motor J-bar 9, facing the upper internal space 11 of the sealed case 10, and for sucking and leaking the refrigerant filled therein. Reference numeral 13 denotes a spring that presses and fixes the motor upper chamber 9 to the stator 14 portion.

On the other hand, the lower outer peripheral edge 1 of the stator 14 is located at the bottom of the motor 4.
A lower chamber 1 is surrounded by a frame 1 that supports and covers the rotor 1G and bears the rotational main shaft 17, and communicates with the upper chamber 8 of the motor 4 inside the motor 4.
8 is formed.

Note that the joint t between the stator 14 and the frame 1 is connected to the stator 14 formed on the frame 1, as shown in FIG.
A rib 20 with an inner diameter slightly larger than the outer diameter of the core of the stator 14 is attached to the mounting end surface 19 of the stator 14.
In the gap space between the inner wall surface 21 of the stator 14 and the outer circumferential wall surface 22 of the stator 14, a thermosetting adhesive 23 containing aluminum powder, iron powder, etc. having refrigerant resistance and compression resistance is applied. After filling, this part 41 is solidified and joined.

Also, as shown in Figures 1 and 2, -1 frame 1
A cylinder 24 is formed integrally with this. Inside this cylinder 27'l is a piston 26 driven by the eccentric shaft portion 2 (5) of the rotating main shaft.
A line element 55 is fitted in the cylinder 2/I, and as shown in the figure, a suction boat 2 is fitted in the head of the cylinder 2/I.
Cylinder head member 2 that zeros 7 and discharge ports 1 to 28, etc.
9 installed. J I'm so happy. .

These suction ports i to 27 and discharge ports 1 to 28 are each equipped with a suction valve and a discharge valve, although not shown.
An annular refrigerant suction chamber 30 is installed which is partitioned by and communicates with the motor lower chamber 18), and a discharge muffler 31 is connected to the downstream side of the discharge bows 1 to 2ε3 to form a refrigerant discharge chamber 3'. S2 is formed.

In other words, in closed type compression, the refrigerant filling the closed case 10 is sucked into the motor upper chamber ε3 (flowed into the motor lower chamber 18, cooling the electric element 3, and cooling the compression element 5).
The refrigerant is supplied into the cylinder 27'I via the refrigerant suction W30. .

By the way, the feature of the present invention is that if the above-mentioned refrigerant suction path is the first suction path 33, a second suction path is separately provided, and the first suction path is changed according to the temperature of the refrigerant. The main feature is that the passage 33 and the second suction passage are automatically switched as appropriate by a switching valve.

As shown in the figure, the second suction passage 34 is formed by a suction vibrator 35 fixed to the discharge muffler 31. One end 36 of this suction vibe 35 is communicated with the refrigerant suction chamber 30 of the compression element 5, and a suction 37 formed at the other end is connected to the refrigerant suction chamber 30 of the compression element 5.
It is provided facing the suction D12 of the first suction passage 33 provided in the motor capuff 9 forming the motor lower chamber 8.

A switching valve for the suction passage is located between the suction port 12 of the first suction passage 33 and the suction [137] of the second suction path 34.

The switching valve 44 of this suction passage will be explained with reference to FIG.

In FIG. 4, 12 is the suction of the first suction passage 33 provided in the motor cap 9, and 7 is the second suction passage 34 formed at the other end of the suction vibrator 355. This is the suction port 37. These two suction ports 12.37 are provided with a barb portion 38 that spans between them. Vibrator part + A38 has upper space '1 of sealed case
Two suction holes 339°/10 are opened in 1, and one of these suction holes $9.40 is opened in the inside of A, and the other is opened so that it can slide freely. A valve body 41 is provided to control the refrigerant i': It is configured to be regulated and automatically moved from both the left and right sides according to the ui degree.
When the refrigerant is high, θ13 (suction valve/r valve 35
suction 1 on the second suction passage 34 side] 37
When the refrigerant is at a low temperature, it is moved to the motor coupler 9 side and the first suction passage 33 side is opened.
The suction port 12 on the third side is opened and the second suction passage 34 side is opened and covered.

The operation of the present invention will be explained below.

Closed type compression (When the compressor 7 is operated under high load during cooling, and the temperature inside the compressor 7 is 11'7 J and the refrigerant temperature is also high, the switching valve 44 of the suction passage is switched to the first suction passage 333.
Leave the side alone. Therefore, the refrigerant flows from the motor upper chamber ε3 to the motor lower chamber 18, and is supplied into the cylinder 24 through the refrigerant suction chamber 30, and the refrigerant flows while hitting the motor 4 and cooling the electric element 3. become.

On the other hand, when the compressor 7 is operated with a low cooling load and the internal temperature of the compressor 7 decreases and the temperature of the refrigerant also becomes low, the switching valve 44 of the suction passage closes the suction port 12 on the first suction passage 33 side. and leave the second suction passage 34 side alone. J-, the refrigerant is sucked in from the suction barb 35 side forming the second suction passage 34, and is supplied into the refrigerant suction chamber 30@C cylinder 24 while being heated by the heat of the discharge muffler 31.

Therefore, even if the compressor 7 is stopped during low-load operation with a large liquid backlog, the refrigerant does not pass through the inside of the Tanabata 4 and is therefore not cooled. Condensation of the waste refrigerant is prevented as much as possible, and the heat c' of the discharge muffler 331 is kept inside the cylinder 24.
Since heated refrigerant is supplied, condensation of the refrigerant (11) is prevented as much as possible.

As a result, the operation of the compressor 7 is stopped during low load operation, and even if the compressor 7 is restarted at that moment, it will not be damaged due to liquid compression.
r1<The risk is reduced and the reliability is greatly improved.
It will be played.

In addition, the switching valve of the inflow passage is made of bar metal (a tongue-shaped valve body is used to switch between the first suction passage and the second suction passage). You may.

1 Effect of Light J In short, the present invention exhibits the following excellent effects.

(1) Low load with a lot of liquid back-up) During rotation, the refrigerant is supplied into the cylinder from the suction vibe side, so the motor and frame are not overcooled by the refrigerant, and the compressor stops during low load operation. The amount of condensation of refrigerant that occurs inside the compressor bed is reduced as much as possible even when the compressor is refrigerated. .

(2) It has a simple structure, can be provided at a low price, and is rich in Ishikawa characteristics.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing the internal body of a hermetic compressor according to a preferred embodiment of the present invention, and FIG. 2 is a side sectional view of the hermetic compressor taken along line ■-■ in FIG. , FIG. 3 is a partially enlarged view showing the joint between the stator and the frame, and FIG. 4 is a side sectional view showing an example of the switching valve of the inflow passage. In the figure, 3 is an electric element, 4 is a motor, 5 is a compression element, 7 is a hermetic compressor, 8 is a t-evening chamber, 9 is a mork cover,
10 is a sealed case, 18 is a motor lower chamber, 24 is a cylinder, 30 is a refrigerant suction chamber, 33 is a first suction passage, 34 is a second suction passage, 35 is a suction vibrator, and 471 is a switching valve for the suction passage. be. Representative Patent Attorney Nori Chika ((i (1 other person) 26 2
52624

Claims (1)

[Claims] The electric element is disposed above and the compression element is disposed below in the sealed case, and the refrigerant filled in the sealed case is supplied from the morph upper chamber formed above the motor constituting the electric element. Closed type compression (in some cases Then, the refrigerant suction path is configured as a first suction passage, and (1) gj is connected to the refrigerant suction chamber of the compression element, and the motor cover j is installed at the other end to form the morph upper chamber. A suction vibrator is provided with a suction port opposite to the suction ['' of the first suction passage which has been tilted, thereby forming a second suction passage.
It is located between the suction () of the RF circuit and the suction port of the second suction passage, and depending on the refrigerant temperature, the suction port of the first suction passage is closed and the second suction passage is opened when the temperature is low. However, when the temperature is high, a switching valve for the suction passage is installed, which opens the suction valve 1 of the first suction passage and closes the suction valve 1 of the second suction passage. Shrinking machine.