JP2006161570A - Compressor for air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a compressor for an air conditioner for preventing occurrence of foaming with relatively simple structure, regardless of a type of a compressor or a type of drive for the compressor. <P>SOLUTION: The compressor comprises: a discharge port 22 discharging the compressed refrigerant that has been sucked from an intake port 20 and compressed; and a discharge check valve 60 capable of opening/closing the discharge port 22, urged in a direction closing the discharge port 22, and then operated to be opened against the urge depending on pressure increase of the compressed refrigerant; and an intake check valve 40 opening/closing the intake port 20 in conjunction with the opening/closing operation of the discharge check valve 60 and fully closing the intake port 20 in a state where the discharge check valve 60 fully closes the discharge port 22. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a compressor for compressing the refrigerant of an air conditioner that performs air conditioning by expansion and condensation of the refrigerant.

2. Description of the Related Art Conventionally, in an air conditioner that performs air exchange by performing heat exchange by expanding and condensing a refrigerant, a compressor for compressing the refrigerant is used.
Since this compressor has a larger heat capacity than a refrigerant circuit including an evaporator of an air conditioner, the temperature of the refrigerant circuit is higher than the temperature of the compressor when the air conditioner is in a stopped state with respect to an external temperature change. Change faster than. For this reason, when the external temperature is rising, the temperature of the refrigerant circuit rises faster than the temperature of the compressor.

  In particular, in a vehicle air conditioner, a refrigerant circuit such as an evaporator is located in or near the passenger compartment, whereas a compressor is generally disposed in an engine room. When the engine is stopped, the temperature in the vehicle compartment rises faster than the temperature in the engine room as the outside air temperature rises, so the difference between the refrigerant circuit temperature and the compressor temperature is significant. It becomes.

As a result, the pressure of the refrigerant in the gaseous state in the refrigerant circuit (hereinafter referred to as refrigerant gas) is higher than the pressure of the refrigerant gas on the compressor side, and the refrigerant gas having increased pressure is Flows from the side to the compressor side and flows into a drive mechanism storage chamber in the compressor, for example, a crank chamber if the compressor is a swash plate type.
The refrigerant gas flowing into the compressor in this way is liquefied and stays in the compressor when the external temperature decreases at night or the like. When the air conditioner starts operating in such a state, the liquefied refrigerant staying in the crank chamber or the like is agitated by the operation of the compressor, and forming occurs. The refrigerant bubbled by forming wash away the lubricating oil in the crank chamber and the cylinder bore, and the lubricating oil is taken out of the compressor together with the refrigerant discharged from the compressor. As a result, poor lubrication occurs in the compressor, and in the worst case, the compressor may be damaged.

In order to eliminate such problems, the rotation speed was gradually increased after starting the compressor, and after a certain period of time at low and medium speeds, it was shifted to high speed operation to prevent the occurrence of forming. A compressor operating method is known (for example, Patent Document 1).
In addition, the control valve structure of the variable capacity compressor is devised to prevent refrigerant leakage inside the control valve, thereby preventing refrigerant gas from flowing into the compressor when the compressor is stopped. It is also known that eliminates (for example, Patent Document 2 and Patent Document 3).
JP 58-152187 A JP-A-10-220349 Japanese Patent Laid-Open No. 10-220350

  However, when the formation of forming is prevented by the control method of the compressor as disclosed in Patent Document 1, there is a problem that a refrigerant having a required pressure cannot be obtained immediately after the operation of the compressor is started. Also, in the case of a compressor for a vehicle air conditioner, it is not only applicable to a type in which the compressor is driven by an engine, but also in a type in which the compressor is driven by a drive source such as an electric motor. A control device for controlling the operation is required.

On the other hand, what is devised in the structure of the control valve as shown in the above-mentioned Patent Document 2 or Patent Document 3 is applied only to the one having a control valve such as a variable capacity compressor, and the structure is There is a problem that it becomes complicated.
The present invention has been made based on the above circumstances, and its object is to provide an air conditioner capable of preventing the occurrence of forming with a relatively simple structure regardless of the compressor and its drive type. It is to provide a compressor.

In order to achieve the above object, an air conditioner compressor according to the present invention includes an intake port for sucking refrigerant of an air conditioner, a discharge port for discharging compressed refrigerant sucked from the suction port, and the discharge port. A discharge check valve that is openable and closable and is urged in a direction to close the discharge port, and that opens against the urge in response to an increase in pressure of the compressed refrigerant, and for opening and closing the discharge check valve An intake check valve that opens and closes the intake port in conjunction with the discharge check valve to fully close the intake port when the discharge check valve is in the fully closed state. 1).
In such a compressor for an air conditioner, the discharge check valve is closed when the pressure of the refrigerant discharged from the discharge port is reduced due to the stoppage of the compressor operation, and the suction check is interlocked with the closing of the discharge check valve. The valve closes. When the compressor is stopped and the discharge check valve fully closes the discharge port, the suction check valve fully closes the suction port.

Further, in the compressor for an air conditioner, when the suction check valve closes in conjunction with the closing of the discharge check valve, the suction check valve before the discharge check valve fully closes the discharge port. Is fully closed (claim 2).
Further, in the compressor for an air conditioner, the suction check valve is provided with a passage through which a refrigerant flows, a valve body that opens and closes the passage, and at least upstream of the valve body in the passage, and the valve body is a predetermined valve body. And a weir that prevents the refrigerant flowing toward the valve body from being blocked when it is in the opened position more than the opening degree, thereby preventing the refrigerant from pressing in the closing direction (Claim 3).
In the compressor for an air conditioner, more specifically, the discharge check valve includes a first passage through which a refrigerant flows, a first valve body that opens and closes the first passage, and the first valve body. A biasing member that biases in the closing direction, and the suction check valve is connected to the second passage through which the refrigerant flows, the second valve body that opens and closes the second passage, and the first valve body. And a rod that drives the opening and closing of the second valve body by moving with the opening and closing of the first valve body.
Furthermore, in such a compressor for an air conditioner, the suction check valve includes an elastic member between the second valve body and the rod, and the second valve body is closed when the first valve body is closed. The rod is closed by being pressed through the elastic member by the rod, and the first valve body is closed when the second valve body is fully closed as the first valve body is closed. The opening is allowed to allow the refrigerant to flow in the first passage, and the urging member further resists the repulsive force of the elastic member after the second valve body is fully closed. The biasing force is set so as to be closed and fully closed (claim 5).

  According to the compressor for an air conditioner of the first aspect, when the compressor is stopped, the suction check valve is closed in conjunction with the closing of the discharge check valve, and the suction check valve fully closes the suction port. When the operation of the compressor is started without flowing into the compressor even if the pressure of the refrigerant gas in the refrigerant circuit such as an evaporator in the air conditioner rises with the rise in the external temperature Forming does not occur.

In addition, a suction check valve is provided at the suction port of the compressor and a discharge check valve is provided at the discharge port so that the suction check valve is closed in conjunction with the discharge check valve. Therefore, the occurrence of forming can be prevented with a relatively simple structure.
According to the compressor for an air conditioner of claim 2, when the suction check valve closes in conjunction with the closing of the discharge check valve, the suction check valve checks the suction before fully closing the discharge port. Since the valve fully closes the suction port, the suction port can be surely fully closed.

  According to the compressor for an air conditioner of claim 3, the compressor starts operation, the discharge check valve is opened, the refrigerant is supplied to the air conditioner, and the suction is performed in conjunction with the opening of the discharge check valve. When the check valve is opened and at a position greater than or equal to the predetermined opening, the weir blocks the refrigerant flowing toward the valve body, thereby preventing the refrigerant from pressing in the closing direction of the valve body. The opening of the suction check valve at the start can be performed without being hindered by the refrigerant flow.

According to the compressor for an air conditioner of claim 4, the second valve of the suction check valve is moved by moving the rod connected to the first valve body of the discharge check valve as the first valve body opens and closes. Since the body is driven to open and close, the formation of forming can be prevented with a relatively simple structure.
Further, the air conditioning compressor according to claim 5 is the air conditioner compressor according to claim 4, wherein when the first valve body of the discharge check valve is closed, the second valve body of the suction check valve is elastically formed by the rod. The first valve body is further closed against the repulsive force of the elastic member after the second valve body is fully closed as the first valve body is closed. As a result, the first valve body is fully closed. By doing in this way, the 2nd valve body of an inhalation check valve can be fully closed reliably.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS.
FIG. 1 schematically shows an air conditioning system for a vehicle.
The vehicle air conditioning system includes a refrigerant circulation path 2, and a swash plate type compressor 4, a condenser 6, an expansion valve 8, and an evaporator 10 are sequentially arranged in the circulation path 2. The compressor 4, the condenser 6 and the expansion valve 8 are arranged in the vehicle engine rules, and the compressor 4 is driven by the vehicle engine 12. On the other hand, the evaporator 10 is accommodated in the instrument panel box of the vehicle.

FIG. 2 shows a part of the compressor 4, specifically, its cylinder head 14. The cylinder head 14 has a suction chamber 16 and a discharge chamber 18 therein, and the suction chamber 16 has an annular shape surrounding the outside of the discharge chamber 18.
The cylinder head 14 is formed with a suction port 20 that communicates with the suction chamber 16 and a discharge port 22 that communicates with the discharge chamber 18. The suction port 20 and the discharge port 22 are adjacent to each other and extend in parallel. The suction port 20 is connected to the evaporator 10 via the circulation path 2, and the discharge port 22 is connected to the condenser 6 via the circulation path 2.

  Therefore, the compressor 4 can receive the refrigerant flowing out of the evaporator 10 into the suction chamber 16 through the circulation path 2 and the suction port 20. The refrigerant in the suction chamber 16 is sequentially subjected to suction, compression, and discharge strokes of the combustible refrigerant in each compression chamber as the piston moves in the cylinder block, and the refrigerant is discharged from each compression chamber to the discharge chamber 18. Discharged. Thereafter, the refrigerant in the discharge chamber 18 is supplied to the condenser 6 through the discharge port 22 and the circulation path 2.

A transverse hole 24 is formed in the cylinder head 14 so as to cross the suction port 20 and the discharge port 22, and a suction check valve 40 is inserted into the transverse hole 24 so as to block the suction port 20. A discharge check valve 60 is inserted so as to block the discharge port 22.
FIG. 3 shows details of the intake check valve 40 and the discharge check valve 60 inserted into the transverse hole 24 of the cylinder head. A partition wall 80 is provided between the suction check valve 40 and the discharge check valve 60, and the inflow check valve 40 and the discharge check valve 60 are separated by the partition wall 80.

  The discharge check valve 60 includes a first passage 62 communicating with the discharge port 22 on the upstream side and the discharge port 22 on the downstream side, a valve hole 64 formed in the first passage 62, and the valve hole 64 side. And a cup-shaped first valve body 66 opened in the opposite direction. The first valve body 66 is slidably fitted in the valve guide 68 and moves to the left in FIG. 3 so as to contact the periphery of the valve hole 64 and close the first passage 62. Yes.

Further, the first valve body 66 is urged in a direction to close the first passage 62 by a valve spring 70 which is an urging member accommodated therein. The urging force of the valve spring 64 is such that the first valve body 66 is opened by the pressure of the refrigerant when the compressor 4 is operated and the refrigerant compressed into the first passage 62 flows from the protruding port 22. Is set.
In FIG. 3, the first valve body 66 is opened against the urging force of the valve spring 70 by the pressure of the refrigerant flowing into the first passage 62 from the upstream discharge port 22 when the compressor 4 operates. The state which the refrigerant | coolant which passed the valve hole 64 has flowed out to the discharge port 22 of the downstream is shown.

A rod 72 is connected to the surface of the first valve body 66 on the valve hole 64 side, and this rod 72 passes through the partition wall 80 and extends to the suction check valve 40 side.
The suction check valve 40 includes a second passage 42 that connects the suction port 20 on the upstream side and the suction port 20 on the downstream side, a valve hole 44 formed in the second passage 42, and the valve hole 44 side. And a cup-shaped second valve body 46 that opens in the opposite direction.

  A disc-shaped lid member 48 having a hole formed in the center is fitted into the opening of the second valve body 46, and a rod 72 penetrating the partition wall 80 from the discharge check valve 60 side opens the hole of the lid member 48. It penetrates and reaches the inside of the second valve body 46. A plate-like pressing member 74 is attached to the end of the rod 72 inside the second valve body 46, and a spring as an elastic member is provided between the pressing member 74 and the second valve body 46. 76 is interposed. The urging force that the spring 76 tries to push back the pressing member 74 when the pressing member 74 presses the second valve body 46 is greater than the urging force that the valve spring urges the first valve body 66 in the closing direction. It is set to be smaller.

When the first valve body 66 is in the position of FIG. 3, the movement of the second valve body 46 in the direction of closing the valve hole 44 is restricted by the pressing member 74 and the lid member 48 coming into contact with each other. The refrigerant is allowed to be sucked into the suction chamber 16 from the second passage 42 through the second passage 42.
Since the first valve body 66 and the second valve body 46 are thus connected via the rod 72 and the spring 76, the first valve body 66 and the second valve body 46 operate as follows. To do. That is, when the compressor 4 stops operating and the refrigerant is no longer supplied to the discharge port 22 in the state of FIG. 3, the first valve body 66 moves in the closing direction by the urging force of the valve spring 70. When the first valve body 66 closes and moves to the left in FIG. 3, the rod 72 moves to the left together with the first valve body 66, and the pressing member 74 presses the second valve body 46 via the spring 76. To do. As a result, the second valve body 46 moves to the left in FIG. 3, and the second valve body 46 abuts around the valve hole 44 to close the second passage 42.

  FIG. 4 shows a state immediately after the second valve body 46 closes the second passage 42 in this way. In this state, the first valve body 66 is not yet in contact with the periphery of the valve hole 64, and the first passage 62 is not completely closed. Since the urging force of the valve spring 70 is set larger than the urging force of the spring 76, the first valve body 66 continues to move in the closing direction by the urging force of the valve spring 70. As the first valve body 66 moves, the rod 72 also continues to move in the left direction in FIG. 4. At this time, the spring 76 interposed between the pressing member 74 at the end of the rod 72 and the second valve body 46 is connected to the rod 72. Since the movement of 72 is absorbed, the first valve body 66 can move in the closing direction until it contacts the periphery of the valve hole 64.

  FIG. 5 shows a state in which the first valve body 66 is closed in this way and contacts the periphery of the valve hole 64 to close the first passage 62. After the second valve body 46 abuts the periphery of the valve hole 44 and closes the second passage 42, the first valve body 66, the rod 72 and the pressing member 74 are further moved, so that the second valve body 46 is spring-loaded. Since the second valve body 46 is further pressed in the closing direction via 76, the second valve body 46 can reliably maintain the second passage 42 in the fully closed state.

Further, since the second valve 42 is fully closed before the first passage 62 is fully closed by the first valve body 66, the first valve body 66 is closed by the first passage 62. Even if the valve is fully closed, the second valve body 46 does not cause the trouble that the second passage 42 cannot be completely closed due to aging or manufacturing errors, and the second passage 42 is reliably fully closed. be able to.
As described above, when the compressor 4 is stopped, the suction port 20 is fully closed by the suction check valve 40 as the discharge check valve 60 closes the discharge port 22. The reliability of the compressor 4 can be reliably prevented by preventing the refrigerant gas from flowing into the compressor 4 from the refrigerant circuit such as the evaporator 10 caused by the rise of the compressor 10 and preventing the formation of foaming at the start of the operation of the compressor 4. Can be improved.

  Next, when the compressor 4 is stopped and the suction check valve 40 and the discharge check valve 60 are in the state as shown in FIG. 5, when the compressor 4 starts operation, it remains in the compression chamber of the compressor 4. After the refrigerant that has been compressed, the refrigerant flows through the discharge chamber 18 to the discharge port 22. The refrigerant whose pressure has increased against the urging force of the valve spring 70 presses the first valve body 66 in the opening direction, and the first valve body 66 moves to the right in FIG. When the rod 72 moves to the right in FIG. 5 due to the movement of the first valve body 66, the pressing member 74 that has pressed the spring 76 also moves in the same direction, but until the pressing member 74 contacts the lid member 48. During this time, the spring 76 absorbs the movement of the pressing member 74, so that the second valve body 46 remains in the state where the second passage 42 is closed.

  When the first valve body 66 continues to move in the opening direction by the pressure of the refrigerant even after the pressing member 74 contacts the lid member 48, the pressing member 74 moves the second valve body 46 through the lid member 48 in FIG. Move to the right. As a result, the valve hole 44 is opened, the upstream suction port 20 and the downstream suction port 20 communicate with each other, and the refrigerant is supplied to the compressor 4 through the second passage 42.

  A position that surrounds at least a part of the outer periphery of the second valve body 46 from the partition wall 80 toward the second valve body 46 when the second valve body 46 is at a position opened by a predetermined opening or more. A weir 78 is extended to the end. When the second valve body 46 opens more than a predetermined opening and a certain amount of refrigerant flows into the second passage 42 from the upstream suction port, there is a large amount of refrigerant flowing toward the second valve body 46. The second valve body 46 is pressed in the closing direction by the refrigerant, and there is a possibility that the second valve body 46 cannot be moved in the opening direction. However, in the suction check valve 40 of the first embodiment, since the outer periphery of the second valve body 46 opened by a predetermined opening or more is surrounded by the weir 78, it will flow toward the second valve body 46 by the weir 78. The refrigerant is blocked. Accordingly, the second valve element 46 can be prevented from being pressed in the closing direction by the refrigerant, and the second valve element 46 can be smoothly opened.

The weir 78 only needs to be able to block the refrigerant that flows toward the second valve body 46 when the second valve body 46 is opened to a predetermined opening or more. Even if only the upstream side of the outer periphery of the second valve body 46 is covered without surrounding the entire outer periphery, substantially the same effect can be obtained.
Although the description of the first embodiment of the present invention has been completed above, the present invention is not limited to the first embodiment, and various modifications can be made without departing from the spirit of the present invention. For example, the suction check valve 40 has the cup-shaped second valve body 46, but instead of this, a flap-type valve can be used.

  FIGS. 6 to 10 show a second embodiment as such a modification, which has a flap-type second valve body 146 in place of the suction check valve 40 having the cup-shaped second valve body 46. An intake check valve 140 is used. A second embodiment of the present invention will be described below based on FIGS. In addition, the same code | symbol is used about a common part with 1st Embodiment described previously.

The discharge check valve 60 is the same as that in the first embodiment and operates in the same manner as in the first embodiment. A rod 172 is connected to the first valve body 66, and the rod 172 extends to the suction check valve 140 side through the partition wall 80 between the suction check valve 140 and the discharge check valve 60.
The suction check valve 140 includes a second passage 142 communicating the suction port 20 on the upstream side and the suction port 20 on the downstream side, a valve hole 144 formed in the second passage 142, and the valve hole 144. And a flap-shaped second valve body 146 that is supported so as to be swingable and opens and closes the valve hole 144. FIG. 10 shows the support portion of the second valve body 146 in an enlarged manner. In FIG. 10, a bracket 152 is provided in the vicinity of the valve hole 144, and the end of the second valve body 146 is swingably supported by a pin 150 supported by the bracket 152. Further, the second valve body 146 is biased in the opening direction by a spring 154 having one end fixed to the second valve body 146 and the other end fixed to the casing side of the suction check valve 140.

  As shown in FIG. 9, a pressure member 182 is attached to the tip of a rod 172 extending toward the suction check valve 140 so as to be slidable in the axial direction of the rod 172, and the discharge check is performed more than the pressure member 182 of the rod 172. A spring 176 as an elastic member is interposed between the flange 184 formed near the valve 60 and the pressing member 182. And the edge part of the press member 182 contacts the 2nd valve body 146 urged | biased by the opening direction.

  The urging force of the valve spring 70 that urges the first valve body 66 of the discharge check valve 60 in the closing direction is such that the pressing member 182 and the heel portion are pressed when the heel portion 184 presses the pressing member 182 via the spring 176. The urging force of the spring 176 acting to separate the 184 from the 184 is greater than the urging force of the spring 176 by the force of the second valve body 146 urged in the opening direction by the urging force of the spring 154 pushing the pressing member 182. It is set to be large.

  FIG. 6 shows that the first valve body 66 is opened against the urging force of the valve spring 70 by the pressure of the refrigerant flowing into the first passage 62 from the discharge port 22 when the compressor 4 is operated, and the valve hole 64 is opened. A state in which the refrigerant that has passed flows out to the discharge port 22 on the downstream side is shown. Since the first valve body 66 is in the open state, the rod 176 is moved to the rightmost position in FIG. 6, and the second valve body 146 is opened in a state of being in contact with the pressing member 182 by the biasing force of the spring 154. ing. Accordingly, the refrigerant is sucked into the suction chamber 14 from the suction port 20 through the second passage 142.

  When the compressor 4 stops operating and refrigerant is no longer supplied to the discharge port 22, the first valve body 66 moves in the closing direction by the urging force of the valve spring 70. When the first valve body 66 closes and moves to the left in FIG. 6, the rod 172 moves to the left together with the first valve body 66, and the flange 184 of the rod 172 presses the spring 176. Further, when the spring 176 pushes the pressing member 182, the second valve body 146 swings in a direction to close the valve hole 144 against the urging force of the spring 154. As a result, the second valve body 146 contacts the periphery of the valve hole 144 and closes the second passage 142.

  FIG. 7 shows a state immediately after the second valve body 146 closes the second passage 142 in this way. In this state, the first valve body 66 is not yet in contact with the periphery of the valve hole 64, and the first passage 62 is not completely closed. The first valve body 66 continues to move further in the closing direction by the urging force of the valve spring 70. As the first valve body 66 moves, the rod 172 also continues to move in the left direction in FIG. 7. At this time, the spring 176 interposed between the flange 184 and the pressing member 182 absorbs the movement of the rod 172. The first valve body 66 resists the urging force of the spring 176 and can move in the closing direction until it contacts the periphery of the valve hole 64.

  FIG. 8 shows a state in which the first valve body 66 contacts the periphery of the valve hole 64 and closes the first passage 62 in this way. After the second valve body 146 comes into contact with the periphery of the valve hole 144 and closes the second passage 142, the first valve body 66 and the rod 172 further move, so that the second valve body 146 is moved via the spring 176. Furthermore, since it is pressed in the closing direction, the second valve body 146 can reliably maintain the second passage 142 in the fully closed state.

  In addition, since the second valve 142 is fully closed by the second valve body 146 before the first valve 62 is fully closed by the first valve body 66, the first valve body 66 is closed by the first passage 62. Even if the valve is fully closed, the second valve body 146 does not cause a problem that the second passage 142 cannot be completely closed due to aging or manufacturing error, and the second passage 142 is surely fully closed. be able to.

  As described above, when the compressor 4 is stopped, the suction check valve 140 fully closes the suction port 20 as the discharge check valve 60 closes the discharge port 22. The reliability of the compressor 4 can be reliably prevented by preventing the refrigerant gas from flowing into the compressor 4 from the refrigerant circuit such as the evaporator 10 caused by the rise of the compressor 10 and preventing the formation of foaming at the start of the operation of the compressor 4. Can be improved.

  Next, when the compressor 4 is stopped and the suction check valve 140 and the discharge check valve 60 are in the state as shown in FIG. 8, when the compressor 4 starts operation, it remains in the compression chamber of the compressor 4. After the refrigerant that has been compressed, the refrigerant flows through the discharge chamber 18 to the discharge port 22. The refrigerant whose pressure has increased against the urging force of the valve spring 70 presses the first valve body 66 in the opening direction, and the first valve body 66 moves to the right in FIG. When the rod 172 moves in the right direction in FIG. 8 due to the movement of the first valve body 66, the flange 184 that presses the spring 176 also moves in the same direction, but the second valve body 146 is moved by the urging force of the spring 154. Until the pressing force of the pressing member 182 exceeds the urging force of the spring 176, the second valve body 146 is kept in a state where the second passage 142 is closed.

Then, when the first valve body 66 continues to move in the opening direction due to the refrigerant pressure, the second valve body 146 swings in the opening direction by the biasing force of the spring 154. As a result, the valve hole 144 is opened and the upstream suction port 20 and the downstream suction port 20 communicate with each other, so that the refrigerant is supplied to the compressor 4 through the second passage 142.
From the partition wall 80 toward the second valve body 146, the weir 178 reaches a position where the refrigerant flowing toward the second valve body 146 is blocked when the second valve body 146 is at a position opened by a predetermined opening or more. Is extended. When the second valve body 146 opens more than a predetermined opening and a certain amount of refrigerant flows into the second passage 142 from the upstream intake port, there is a large amount of refrigerant flowing toward the second valve body 146. The second valve body 146 is pressed in the closing direction by the refrigerant, and the second valve body 146 may not be moved in the opening direction. However, in the suction check valve 140 according to the second embodiment, when the second valve body 146 is in a position opened by a predetermined opening or more, the refrigerant that attempts to flow toward the second valve body 146 is blocked by the weir 178. It is done. Therefore, it is possible to suppress the second valve element 146 from being pressed in the closing direction by the refrigerant, and the second valve element 146 can be smoothly opened.

  As described above, the second embodiment can achieve the same effects as those of the first embodiment described above, but the present invention is not limited to the first and second embodiments. Various modifications can be made without departing from the spirit of the present invention. The same discharge check valve 60 is used in the first embodiment and the second embodiment, but various check valves can be used instead. In the first embodiment and the second embodiment, the present invention is applied to a compressor for an air conditioner of a vehicle. Is applicable. Further, the compressor is not limited to the swash plate type, and the present invention can be applied to various compressors, and it is needless to say that the present invention can be widely applied regardless of the driving method of the compressor. Absent.

It is the block diagram which showed the vehicle air conditioner schematically. FIG. 2 is a partially broken view showing a cylinder head of a swash plate type compressor incorporated in the air conditioner of FIG. 1 as a first embodiment. It is a figure which expands and shows the fracture | rupture part of the cylinder head of FIG. 2, and shows the state in which the compressor is operating. FIG. 4 is a view immediately after the compressor is stopped and the suction check valve is closed from the state of FIG. 3. It is a figure which shows the state which also closed the discharge check valve from the state of FIG. It is a figure which expands and shows the fracture | rupture part of the cylinder head of the compressor integrated in the air conditioner of FIG. 1 as 2nd Embodiment, and shows the state in which the compressor is operating. It is a figure which shows immediately after the compressor stopped and the suction check valve closed from the state of FIG. It is a figure which shows the state which the discharge check valve closed from the state of FIG. It is a figure which shows the detail of the rod end part of 2nd Embodiment. It is a figure which shows the detail of the 2nd valve body support part of 2nd Embodiment.

Explanation of symbols

4 Compressor 20 Suction Port 22 Discharge Port 40,140 Suction Check Valve 60 Discharge Check Valve 72,172 Rod 76,176 Spring 78,178 Weir

Claims (5)

In the compressor for an air conditioner that compresses the refrigerant of an air conditioner that performs air conditioning by expansion and condensation of the refrigerant,
A suction port for sucking the refrigerant;
A discharge port for discharging a refrigerant sucked and compressed from the suction port;
A discharge check valve that is provided so as to be able to open and close the discharge port, and is biased in a direction to close the discharge port, and is opened against the bias according to an increase in pressure of the compressed refrigerant;
An intake check valve that opens and closes the suction port in conjunction with the opening and closing operation of the discharge check valve, and that fully closes the suction port when the discharge check valve is in a state of fully closing the discharge port. A compressor for an air conditioner.   When the suction check valve closes in conjunction with the closing of the discharge check valve, the suction check valve fully closes the suction port before the discharge check valve fully closes the discharge port. The compressor for an air conditioner according to claim 1.   The suction check valve is provided at a position where the refrigerant flows, a valve body that opens and closes the passage, and at least an upstream side of the valve body of the passage, and the valve body is opened at a predetermined opening or more. The compressor for an air conditioner according to claim 1, further comprising a weir that blocks the refrigerant flowing toward the valve body and thereby suppresses pressing of the valve body in the closing direction by the refrigerant. The discharge check valve includes a first passage through which a refrigerant flows, a first valve body that opens and closes the first passage, and a biasing member that biases the first valve body in a closing direction,
The suction check valve is connected to the first valve body and moves as the first valve body opens and closes, a second passage through which the refrigerant flows, a second valve body that opens and closes the second passage, and the first valve body. The compressor for an air conditioner according to claim 1, further comprising: a rod that opens and closes the second valve body.   The suction check valve includes an elastic member between the second valve body and the rod, and the second valve body is pressed by the rod through the elastic member when the first valve body is closed. The first valve body allows the refrigerant to flow in the first passage when the second valve body is fully closed as the first valve body is closed. The biasing member is attached so that the first valve body is further closed against the repulsive force of the elastic member after the second valve body is fully closed. The compressor for an air conditioner according to claim 4, wherein a force is set.

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