JPS6287691A - Rotary compressor - Google Patents

Abstract

PURPOSE:To improve running efficiency of a refrigerating cycle, by providing in a closed vessel a valve operable by a pressure differential between a discharge pressure and a suction pressure and adapted to block channels in a suction pipe and a discharge pipe both extending out of the vessel. CONSTITUTION:A cylindrical member 22 is vertically arranged in a closed vessel 11. A discharge pipe 36 and a suction pipe 34 are connected to a side wall of the cylindrical member 22. A discharge passage 35 is connected to the cylindrical member 22 in such a manner as to be opposed to an opening portion of the discharge pipe 36, while a suction passage 32 is connected to the cylindrical member 22 in such a manner as to be opposed to an opening portion of the suction pipe 34. There is provided in the cylindrical member 22 a valve 23 adapted to block channels of the suction side and the discharge side. A discharge pressure is applied to one end portion of the valve 23, and an elastic force of a spring 29 and a suction pressure are applied to the other end portion. When a compressor is stopped, the valve 23 is moved upwardly because of a decrease in the discharge pressure and the application of the elastic force. As a result, the communication between the discharge pipe 34 and the closed vessel 11 and between the suction pipe 36 and the closed vessel 11 is blocked to thereby prevent a refrigerant gas from flowing to a refrigerating cycle.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Application for Pieces) The present invention relates to a compressor that compresses refrigerant gas using a compression element rotated by an electric motor.

[Conventional technology]

FIG. 8 is a block diagram of a conventional refrigeration cycle disclosed in, for example, Japanese Unexamined Patent Publication No. 58-2115117.

In the diagram, (1) is a rotary compressor, (2) is a condenser, and (3)
is a solenoid valve, (4) is a capillary tube, (5) is an evaporator, and (6) is a reverse valve.

A conventional refrigeration cycle is configured as described above.

When the compressor (1) is operated, the compressed refrigerant gas is guided in the direction shown by the arrow in the figure, and is condensed in the condenser (21).
It evaporates in the evaporator (5) to perform a freezing action, and then goes to the compressor (5) again.
Return to 1). Then, when the compressor (1) stops.

The solenoid valve (3) shuts off a portion of the high pressure side circuit of the refrigeration cycle, and the reversal valve (6) shuts off a portion of the evening pressure side circuit. This is because when the 2 compressors (1) are stopped, a large amount of high temperature and high pressure gas in the closed container is transferred to the condenser (2), 2 capillary tubes (4).
, in the cylinder through the evaporator (5) and the sealing part of each part of the compression element in the closed container.

Since it flows through the suction pipe and the evaporator (5) (trying to keep the pressure and temperature in the circuit in equilibrium), this increases the heat load on the refrigeration cycle and prevents the efficiency of the refrigeration cycle from decreasing.

In Figure 9, the same operation as in Figure 8 is performed using the pressure difference change before and after the check valve (6). signal '1 (8i, (9
1 Normally, an internal pressure diaphragm is used in the differential pressure valve that operates according to the pressure knife number 1. The differential pressure valve (7) has a high pressure side pressure signal (discharge side) and a low pressure side pressure signal (each suction side). is detected, especially the low pressure side pressure 'f'1 (compressor (1) and check valve (
6) After the compressor (1) stops, the diaphragm pressure] rises and is almost in equilibrium with the diaphragm high pressure side pressure. Therefore, using this diaphragm displacement, the high pressure side and low pressure side circuits are Activate the valve body provided inside.

FIG. 10 shows a circuit having a similar function, in which a differential pressure valve and an internal pressure check valve are installed integrally, and a lid-integrated differential pressure valve (11) is used.

[Problem that the invention seeks to solve]

The conventional refrigeration engine "RL" as described above has a solenoid valve (3) to prevent the refrigerant from flowing back when the refrigeration system (1) is stopped.
, using a differential pressure valve (7) or an integrated differential pressure valve mechanism. Therefore, if the 'Jl solenoid valve (3) is used, the solenoid valve itself consumes electric power, reducing efficiency. Also, even when using a differential pressure valve (7) or an integrated pressure differential valve member.

Malfunction due to complexity of signal piping and operating structure.

Deterioration in reliability due to leakage due to an increase in the number of welded parts is unavoidable. There are problems such as the cost and assembly cost of these control valves being high.

This invention was made in order to solve the above-mentioned problems, and is a rotary compressor that has a simple structure and high reliability (2) and has an inexpensive valve device, and can improve the operating efficiency of the refrigeration cycle. The purpose is to provide a machine.

Another object of the present invention is to provide a rotary compressor in which the valve device operates more reliably in addition to the above object.

[Means for solving problems]

The rotary compressor according to the present invention has a communication passage inside or outside the hermetic container, one end of which communicates with the inside of the hermetic container and the other end of which communicates with the suction passage, and the rotary compressor is inserted into the suction passage and the discharge passage. A cylindrical body is provided.

A valve body is provided in this cylindrical body, and when one end is pressed by the discharge pressure of the refrigerant gas, the suction passage and the discharge passage are communicated with each other, and the other end is pressed by the backflow pressure of the refrigerant gas and the spring pressure. This is because the suction passageway and the discharge passageway are respectively closed.

Another invention of the present invention is that, in the above-mentioned thing, a reverse a blocking body is provided in the suction passage to prevent the flow of refrigerant gas in the anti-suction direction. 3. [Function] This In the invention π, when the pressurizer is in operation, the valve body in the cylindrical body is pressed by the discharge pressure (IJ), and the suction passages and the outlet passages 14 are in communication with each other, but when the pressurizer is stopped 1- At 8 o'clock, the refrigerant gas flows backwards and the pressure at the bent end of the valve body increases to 1. .

The valve body moves due to the spring force and suction jb N・S1
11 and the discharge passage, there is a tL closing door 7, 1,
7.

Another invention of this invention...
7N: λ'·T -'The pressure at the other end of the P body rises rapidly, and the valve body moves even more rapidly.

〔Example〕

Figures 1 to 4 are diagrams showing one embodiment of the present invention.
The figure is a cutaway side view of the compressor, Figures 2 and 3 are explanatory diagrams of the operation of the valve device, and Figure 4 is a configuration diagram of the refrigeration cycle.
il, (2+, (41, (51) are the same as in the conventional device described above.

In the figure, (111 is a closed container, mackerel is an electric motor housed in a closed container U, (13 is a crankshaft driven by electric motor α2, aa is a cylinder (15) and a piston αe
A compression element consisting of cylinder α9 is a closed container α1)K
The piston (10) is fixed and configured to be fitted into an eccentric portion formed in the crankshaft circle and rotate eccentrically within the cylinder area.The cylinder (19 has a vane (not shown) passing through it). One end is pressed by a compression spring (not shown), and the other end contacts the outer periphery of the piston Fil, and is reciprocated by the rotation of the piston Of9. α9 is the bearing (discharge valve installed at 1η, ■ is the discharge muffler installed with fewer discharge valves, Ql) is the bearing between the compression element station and the closed vessel αυ. The valve device is placed in the valve device (a cylindrical body forming a 2D main body, with two through holes (22a), (22b)
) forming part of the suction passage and the discharge passage, respectively. (22e) and (22d) are the suction valve body side space and the discharge valve body side space formed at the end of the cylindrical body @, and (c) is the suction side valve slidably provided in the cylindrical body (to). body(
The valve body consists of a valve body on the discharge side and a valve body on the discharge side, and the valve body on the suction side @ has a thread-like communication part (24a) and a cylindrical blocking part (241).
), and the discharge side valve body (to) also has a communication part (25a
, ) and the closing part (251)), the valve body (to), and @ are connected to each other by a connecting rod. (A) is a restraining piece of an annular body that is fixed in the cylindrical body (J) and regulates the lower limit position of the discharge side valve body (G), @ is a restraining piece @ on the discharge side valve body (C) side A sealing material such as a gasket or an O-ring fixed to the end face is provided in the suction valve body side space (220), and the sealing material such as an O-ring is fixed to the end face of the suction side valve body (2).
0η is a plug with a hole provided on the opposite end face of the discharge valve body.

03 is the suction side of the compression element I and the through hole (22a
), Q3 is a communication passage connecting the suction passage 63 and the suction valve body side space (22) of the cylindrical body @ (to)
is a suction pipe that is connected to the through hole (22a) and passes through the upper part 9 of the closed container and is connected to the evaporator (5) and forms part of the suction passage; (G) is connected to the through hole (22b) and is connected to the closed container αB
The discharge passage (7) that communicates with the inside is a discharge pipe that is connected to the through hole (22b), passes through the closed container αυ, is connected to the condenser (2), and forms a part of the discharge passage. Note that the magnetic valve (3), the differential pressure valve (7), or the integrated differential pressure valve shown in FIGS. 8 to 10 are not provided. When the machine (1) is in operation, the valve body is located at tj!, where the end face of the discharge side valve body (c) is in contact with the sealing support (support) as shown in Figure 2. , the force P2 due to the pressure in the discharge valve body 11Iil space (22d) is larger than the resultant force of the force P1 due to the pressure in the suction valve body side space (22) of the cylindrical body 0J and the force ps of the pressing spring (to). This is because the valve body is pressed against one side of the stopper.At this time, the communication part (24a) of the valve body
), (25 is a through hole (22a, ), (22k))
The positions gf and Jc match, the suction pipe (b) and the suction passage are in communication, and the discharge passage (to) and the discharge pipe (to) are in communication. Note that the high and low pressures are isolated from each other by the contact between the discharge side valve body (to) and the sealing material (to).

Next, when the compressor (1) stops, the high-pressure, high-temperature refrigerant gas in the closed container (11) is transferred to the airtight areas 1 of each component on the compression element side, such as the vane guide of the vane and the cylinder (toward), as described above. It flows back into the suction passage (toward) through the gap in the through hole, through the inside of the cylinder e. Since this pressure is transmitted through the communication path (G), the pressure in the suction valve body side space (22C) increases, and the resultant force of the force P1 due to this pressure and the force Pθ of the spring holder is applied to the discharge side valve body ( ) The force P2 and p acting on the end face of
As shown in the figure, it stops at the position where the connecting side end face of the π suction side valve element (material) comes into contact with the stopper piece (material).

At this time, the closed part (24b), (25b) of the valve body (to)
) match the positions of the through holes (22a) and (22b),
The suction pipe ■ and the suction passage opening are closed, and the discharge passage (g) and the discharge pipe (to) are closed n, 6. This prevents the refrigerant gas in the closed container (1) from flowing backward through the suction pipe (2) and into the evaporator (5).

Also, when restarting the compressor (1), the piston (lE9
With the rotation of , the pressure P in the suction passage to the compression element I
1 also descends, and the resultant force of the pushing force 2 is the force P due to the pressure inside the closed container (11) that acts on the valve body @? When it becomes smaller than , the valve body @ moves to the suction side valve body @ side again,
As described above, it comes into contact with the stopper piece (2) and stops, and the suction and discharge passages are communicated.

5 to 7 are valve devices C showing other embodiments of the present invention.
It is a longitudinal cross-sectional view of 11 parts.

Figure 5 shows a case in which a backflow blocker is provided in the suction passageway to prevent the flow of refrigerant gas in the counter-suction direction.In this embodiment, a fluid diode is used, It is located between (to).

As a result, the backflow resistance in the suction passage C32 increases, so the pressure in the suction valve body side space (22) increases rapidly after the compressor (1) is stopped, and the pressure in the suction passage 33 and the suction pipe ( ) is closed, resulting in a more reliable valve control operation.As a result, it becomes possible to minimize the outflow of high-temperature, high-pressure refrigerant gas from the closed container (1).

Fig. 6 shows a case in which a backflow prevention body is provided between the suction side valve body (241) and the suction pipe (A). In this embodiment, a check valve body C1 is used - its function is the same as in Fig. 5. be.

In Fig. 7, a valve device Qi) is provided close to the outside of a closed container (11), and the end face of the cylindrical body (2) on the side of the discharge valve body is sealed with a plug (N), and the discharge passage (to) and the discharge valve body lateral space (
22(L) is a communication path (communicated through 4υ).

The operation of FIG. 7 is completely similar to that of FIGS. 1 to 3, and the same functions can be provided.

As in each of the above embodiments, the valve device Cυ may be provided inside the closed vessel αυ, or may be provided outside the closed vessel +111 as a part of the compressor (1) in close proximity thereto.
The bath contact point on the user side of the compressor (1) has also been greatly reduced,
It is also advantageous in terms of reliability and cost.

〔Effect of the invention〕

With the above explanation, this invention has a communicating passage inside or outside of the sealed container, one end of which communicates with the inside of the sealed container and the other end of which communicates with the suction passage, and is inserted into the suction passage and the discharge passage, respectively. Provide a cylindrical body.

A valve body is provided in this cylindrical body, and when one end is pressed by the discharge pressure of the refrigerant gas, the suction passage and the discharge passage are communicated with each other, and the other end is pressed by the backflow pressure of the refrigerant gas and the spring pressure. Ktu so that the suction passages and the discharge passages are respectively closed. As a result, the structure is simple, highly reliable, and has an inexpensive valve device, which has the effect of increasing the operating efficiency of the refrigeration cycle.

Another aspect of the present invention is that a backflow blocker is provided in the suction passage to block the flow of refrigerant gas in the counter-suction direction.
This has the effect of making the operation of the valve device more reliable.

[Brief explanation of drawings]

1 to 4 are views showing one embodiment of a rotary compressor according to the present invention, in which FIG. 1 is a cutaway side view of the compressor, and FIGS. 2 and 3 are views of the valve device shown in FIG. 1. An explanatory diagram of the operation, FIG. 4 is a refrigeration cycle configuration diagram, FIGS. 5 to 7 are longitudinal sectional views of a valve device portion showing other embodiments of the present invention, and FIGS. 8 to 10 are a conventional refrigeration cycle. FIG. In the figure, (1) is a compressor, αυ is a closed container, and f13 is an electric motor. α4 is a compression element, @ is a cylindrical body, □□□ is a valve body, f24 is a suction side valve body, (c) is a discharge side valve body, (to) is a pressure spring, (
) is the suction passage, 03 is the communication passage, 941 is the suction passage (
suction pipe), (to) is the discharge passage, c! 6 is a discharge passage (discharge pipe), (to) is a backflow blocker (fluid diode), (
3I is a backflow prevention body (backward valve body), and aυ is a communication path. Note that the same reference numerals in the two figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A compression element rotated by an electric motor is housed in an airtight container, and refrigerant gas sucked in from the suction passage is compressed by the compression element and discharged from the airtight container through the discharge passage and sent into the refrigeration cycle. The tube is provided inside or outside the sealed container and is formed into a cylindrical shape, and has a communicating passageway that communicates with the inside of the sealed container at one end and the suction passageway at the other end, and connects the suction passageway and the discharge passageway to the suction passageway. When the inserted cylindrical body and one end of the cylindrical body are pressed by the discharge pressure of the refrigerant gas, the suction passage and the discharge passage communicate with each other in the first position, and the other end is pressed by the discharge pressure of the refrigerant gas. The valve body is characterized by comprising a valve body whose end closes the suction passage and the discharge passage when the end thereof is moved to the second position by being pressed by the backflow pressure of the refrigerant gas from the communication passage and the spring pressure. Rotary compressor. (2) A compression element rotated by an electric motor is housed in an airtight container, and refrigerant gas sucked in from the suction passage is compressed by the compression element and discharged from the airtight container through the discharge passage and sent into the refrigeration cycle. The tube is provided inside or outside of the sealed container and is formed into a cylindrical shape, one end communicating with the inside of the sealed container, the other end having a communicating passage with the suction passage, and the suction passage with the discharge passage. When the inserted cylindrical body and one end of the cylindrical body are pressed by the discharge pressure of the refrigerant gas, the suction passage and the discharge passage communicate with each other in the first position, and the other end is pressed by the discharge pressure of the refrigerant gas. a valve body that respectively closes between the suction passages and between the discharge passages when the end thereof is moved to a second position by being pressed by backflow pressure of refrigerant gas from the communication passage and spring pressure; and a valve body provided in the suction passage; A rotary compressor comprising: a backflow blocker that blocks the flow of the refrigerant gas in a counter-intake direction.