JPH0222599Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Field of Application) The present invention relates to air conditioning and refrigeration systems used in vehicles and the like.

(Problems to be solved by conventional technology and inventions) When cooling and freezing are performed in an air-conditioning or refrigerating vehicle, etc., the evaporation pressures of the respective evaporators of the cooling system and the freezing system are different from each other, so it is necessary to install both evaporators in one unit. If the refrigerant from the refrigeration system with low evaporation pressure is connected to the suction port of the compressor in common, the refrigerant from the refrigeration system with low evaporation pressure will not be drawn into the compressor, and only the refrigerant from the cooling equipment with high evaporation pressure will be taken into the compressor. This causes problems such as not working. Therefore, separate compressors are used for the cooling system and refrigeration system, or if a single compressor is used for both purposes, a multi-cylinder plunger compressor is used, and the suction ports for cooling and refrigeration are separate. If the refrigerant is sucked into separate cylinders and compressed, or if a vane type compressor is used for both, a pressure reducing valve is installed at the outlet of the cooling evaporator, which has a high evaporation pressure, and the cooling refrigerant is compressed. The refrigerant is sucked into an upper vane compressor whose pressure is reduced to the same pressure as the refrigerant used for refrigeration, and then compressed. Vane type compressors have the advantage of having a simple structure and being suitable for high-speed rotation compared to other compressors, but when used for both cooling and freezing as mentioned above, it is necessary to reduce the refrigerant pressure for cooling to the refrigerant pressure for freezing. The volumetric efficiency decreases, and the compressor must therefore be larger.

This invention was made in view of the above circumstances, and includes:
Although a single vane type compressor can be used for both cooling and freezing, it can eliminate the disadvantages such as a decrease in volumetric efficiency and the resulting increase in the size of the compressor. It is an object of the present invention to provide a cooling/refrigeration system in which operation of only one of the above and the refrigeration operations can be selected as necessary.

(Means for Solving the Problems) In order to achieve the above object, the cooling/refrigeration system of the present invention includes a cam ring having an oval cam circumferential surface on the inner surface, and a front side block and a rear side block joined to both sides of the cam ring. A circular rotor supported by a rotating shaft is fitted into the formed pump housing, and the inner surface of the pump housing is formed by the outer circumference of the rotor, the circumferential surface of the cam, the inner surface of the front side block, and the inner surface of the rear side block. Two pump operating chambers are defined in the rotor, and a plurality of slits are formed in the radial direction of the rotor, and a plate-shaped vane is fitted into each of these slits so as to be able to move forward and backward, and as the rotor rotates, the vane moves. By rotating integrally with the rotor while moving back and forth through the slit with one end in sliding contact with the circumferential surface of the cam, the refrigerant is supplied from the two suction ports provided in the front head to the two inside the front head. The refrigerant is sucked into the two pump working chambers through a suction chamber and two inlets opened to each suction chamber, and the sucked refrigerant is compressed in each of the pump working chambers and flows out from each outlet. The vane compressor is equipped with a multi-chamber vane compressor that discharges water from a single discharge port, and an air conditioning circuit and a refrigeration circuit are connected to the two suction ports of the vane compressor in parallel with each other. the single discharge port is connected to the inlet of a receiver tank via a condenser; the outlet of the receiver tank is connected to the inlet ends of the cooling circuit and the refrigeration circuit, respectively; An expansion valve, an evaporator, and a first on-off valve are respectively interposed in order from the inlet end side to the outlet end side, and an expansion valve and an evaporator are respectively interposed in the refrigeration circuit in order from the inlet end side to the outlet end side. The first on-off valve outlet side of the cooling circuit and the evaporator outlet side of the refrigeration circuit are connected by a bridge circuit, and a second on-off valve is interposed in the bridge circuit, and the first on-off valve By opening the valve and closing the second opening/closing valve, a cooling or freezing operation state is entered; by opening both the first and second opening/closing valves, a cooling operating state is entered; By closing the valve and opening the second on-off valve, the refrigeration operation state is established.

(Function) When the first on-off valve is open and the second on-off valve is closed, cooling is performed.
It enters freezing operation state. Further, when both the first and second on-off valves are open, the air conditioner is in a cooling operation state. Furthermore, the first
When the on-off valve is closed and the second on-off valve is open, the refrigeration operation state is entered.

(Example) Hereinafter, an example of the present invention will be described based on the drawings. 1 to 3 show a vane type compressor used in the cooling and refrigeration equipment of the present invention, and as shown in these figures, the vane type compressor C has a cylindrical case 1 and has a cylindrical case 1. The housing of the compressor is formed by the case 1 and the front head 1a attached to the front surface of the case 1, and inside the housing is a pump housing 2 consisting of a cam ring 2a, front side blocks 2b and rear side blocks 2c joined to both sides of the cam ring 2a. is provided. A cylindrical rotor 3 is fitted into the pump housing 2, and a plurality of slits 3a are formed along the radial direction and at equal intervals in the circumferential direction. A plate-shaped vane 3b is fitted so that it can move forward and backward. Rotor 3 is front side block 2
The rotary shaft 5 is fitted onto the inner end of a rotating shaft 5 supported by a bearing portion 4 integrally formed with the rotary shaft 5.b. The rotating shaft 5 is attached to the end face of the bearing portion 4, and the rotor 3 is attached to the rear side block 2c.
are supported on the inner surfaces of the pump housing 2 via thrust bearings 6 and 7, respectively, and are rotatable within the pump housing 2. An oval cam peripheral surface 2d is formed on the inner surface of the cam ring 2a, and the rotor 3
Two pump operating chambers 8 ₁ and 8 ₂ are symmetrically formed within the pump housing 2 by the outer periphery of the pump housing 2, the cam circumferential surface 2d, and the inner surfaces of the front side block 2b and rear side block 2c. Inflow ports 9 ₁ , 9 ₂ formed in the cam ring 2a are provided on the suction side and the discharge side of both pump working chambers 8 ₁ , 8 ₂ .
and outflow ports 10 ₁ and 10 ₂ are opened, respectively.
On the other hand, there is a partition wall 11a inside the front head 1a.
Thus, suction chambers 11 ₁ and 11 ₂ are formed which are divided into two chambers, and each inlet port 9 ₁ and 9 ₂ formed in the cam ring 2a penetrates the front side block 2b and opens to one inlet. ing. The front head 1a has two openings leading to each suction chamber 11 ₁ , 11 ₂ .
Inlet ports 12 ₁ and 12 ₂ are provided. The outlet ports 10 ₁ , 10 ₂ are provided with discharge valves 13 ₁ , 13 ₂ , a discharge pressure chamber 14 is formed between the pump housing 2 and the case 1 , and the case 1 has a single discharge port 1 .
5 and a lubricating oil supply/discharge port (not shown).

The vane compressor C configured as above is
When the rotational force is transmitted to the rotating shaft 5, the rotor 3 rotates, and the vane 3b is pushed outward by the centrifugal force generated by the rotation and the oil pressure of the lubricating oil introduced into the bottom of the slit 3a, and the cam It rotates while moving back and forth within the slit 3a while in sliding contact with the circumferential surface 2d. Along with this rotation, the space within each pump working chamber 8 ₁ , 8 ₂ formed by the adjacent vanes 3 b , 3 b and the cam circumferential surface 2 d changes from the minimum to the maximum in the suction stroke, and the refrigerant is transferred to the front. Suction is drawn from the suction ports 12 ₁ , 12 ₂ of the head 1a into the pump working chambers 8 ₁ , 8 ₂ through the suction chambers 11 ₁ , 11 ₂ and the respective inflow ports 9 ₁ , 9 ₂ opened therein, and in the compression stroke. Compressing the refrigerant varies from maximum to minimum, each outlet 10
The respective discharge valves 13 ₁ and 13 ₂ are opened from ₁ and 10 ₂ to discharge the fluid into the discharge pressure chamber 14 and join the discharge valves 13 1 and 13 2 . After this operation continues, the compressed refrigerant reaches a predetermined pressure, and the compressed refrigerant reaches the discharge port 15.
It is then sent through the cooling and refrigeration circuits.

The fourth section describes the configuration and operation of the cooling and refrigeration system of the present invention incorporating such a vane type compressor C.
This will be explained with reference to the figures.

The compressed refrigerant compressed to a pressure of approximately 15 to 20 Kg/cm ² ·G by the vane compressor C is sent from the discharge port 15 to the condenser 16, cooled and liquefied, and received in the receiver tank 17. It is designed to be distributed in parallel to the refrigeration circuit. The cooling circuit includes an expansion valve 18 ₁ that depressurizes and expands the refrigerant to a pressure of approximately 2 kg/cm ² ·G, and a cooling evaporator 19 ₁
It is connected to one suction port 12 ₁ of the vane compressor C via a first on-off valve 20 formed of a solenoid valve or the like. The refrigeration circuit is connected to the other suction port 12 ₂ of the vane compressor C via an expansion valve 18 ₂ that reduces and expands the refrigerant to a pressure of approximately 1 to 2 kg/cm ² ·G and a refrigeration evaporator 19 ₂ . . The cooling circuit and the freezing circuit are connected by a bridge circuit 21 in front (upstream side) of the suction ports 12 ₁ and 12 ₂ , and this bridge circuit 21 is provided with a second on-off valve 22 made of a solenoid valve or the like. .

In such a configuration, when the cooling device and the freezing device are operated simultaneously, when the first on-off valve 20 of the cooling circuit is opened and the second on-off valve 22 of the bridge circuit 21 is closed, about 15 to 20 kg/ The compressed refrigerant compressed to a pressure of cm ² G is introduced in parallel to the cooling circuit and the refrigeration circuit, and the compressed refrigerant introduced to the cooling circuit is decompressed and expanded to a pressure of approximately 2 kg/cm ² G by the expansion valve ₁₈₁ . Cooling evaporator 19 ₁ to about 0
℃, heat exchanges with the air inside the car via the cooling evaporator ₁₉₁ , and raises the temperature.
It will lead you to ₁ . On the other hand, the compressed refrigerant introduced into the refrigeration circuit is decompressed and expanded by the expansion valve 18 ₂ to a pressure of approximately 1 to 2 Kg/cm ² ·G to cool the refrigeration evaporator 19 ₂ to -10 to -15°C. Evaporator 19
₂ , the air exchanges heat with the air inside the freezer, rises, and is guided to the other suction port ₁₂₂ of the vane compressor C. Here, the refrigerant reduced to a pressure of 2 kg/cm ² ·G in the cooling circuit enters the suction chamber 11 1 from the suction port 12 ₁ and passes through the inlet _{9 1 to} one of the pump operating chambers 8 ₁
is inhaled and then compressed to about 15-20Kg/ ^cm2 .
The refrigerant is discharged into the discharge pressure chamber 14 at a pressure of G, and on the other hand, the refrigerant in the refrigeration circuit whose pressure is reduced to a pressure of 1 to 2 Kg/cm ² G enters the suction chamber 11 ₂ from the suction port 12 ₂ and flows through the inlet 9 ₂ . It is sucked into the other pump working chamber 8 ₂ ,
The refrigerant is then compressed and discharged into the discharge pressure chamber 14 at the above-mentioned pressure, where the two compressed refrigerants join together and are again discharged from the discharge port 15 into the cooling circuit and the refrigeration circuit. That is, since both refrigerants for cooling and freezing are separately introduced into the suction and compression systems formed in parallel with one vane type compressor C, even if the pressures are different, both refrigerants are used in one vane type compressor C. The air is sucked in and compressed, and both the cooling and refrigeration systems operate together.

In addition, when only the cooling device is operated, when both the first on-off valve 20 of the cooling circuit and the second on-off valve 22 of the bridge circuit 21 are opened, the refrigerant at a pressure of 2 kg/cm ² ·G in the cooling circuit is 1 through the on-off valve 20 and into one suction port 12 ₁ of the vane type compressor C. On the other hand, since the refrigerant pressure on the cooling circuit side of the bridge circuit 21 is higher than the refrigerant pressure on the refrigeration circuit side, the refrigerant in the cooling circuit is The refrigerant flows through the second on-off valve 22 to the refrigeration circuit side, suppresses the flow of refrigerant in the refrigeration circuit, and is sucked into the other suction port 12 ₂ of the vane compressor C. That is, in this case, the refrigeration system hardly operates, and only the cooling system operates, due to the same effect as the conventional vane type compressor that cannot be used for both cooling and freezing purposes, which have different evaporation pressures.

Furthermore, when only the refrigeration system is operated, if the first on-off valve 20 of the cooling circuit is opened and the second on-off valve 22 of the bridge circuit 21 is opened, the refrigerant will not flow through the cooling system and the refrigeration will start. The refrigerant in the circuit is directly sucked into the suction port 12 ₂ , while flowing to the cooling circuit side through the second on-off valve 22 of the bridge circuit 21 and sucked into the suction port 12 ₁ so that only the refrigeration system operates.

(Effects of the Invention) As explained above, the cooling and freezing device of the present invention includes a pump housing formed by a cam ring having an oval cam circumferential surface on the inner surface, and a front side block and a rear side block joined to both sides of the cam ring. A circular rotor supported by a rotating shaft is fitted inside the pump housing, and the outer circumference of the rotor, the circumferential surface of the cam, the inner surface of the front side block, and the inner surface of the rear side block allow two pumps to operate within the pump housing. A chamber is defined, a plurality of slits are formed in the radial direction of the rotor, and a plate-shaped vane is fitted into each of these slits so as to be movable back and forth, and as the rotor rotates, the vane connects one end of the vane to the cam. By rotating together with the rotor while moving back and forth through the slit while in sliding contact with the circumferential surface, the refrigerant is transferred to the
Two suction chambers in the front head and one opening into each of these suction chambers from the two suction ports.
The refrigerant is sucked into the two pump working chambers through two inlets, and the sucked refrigerant is compressed in the two pump working chambers and flows out from each outlet, and then discharged from a single discharge port. a multi-chamber vane type compressor, the outlet ends of a cooling circuit and a refrigeration circuit which are parallel to each other are respectively connected to the two suction ports of the vane type compressor;
The single discharge port is connected to the inlet of a receiver tank via a condenser, the outlet of the receiver tank is connected to the inlet ends of the cooling circuit and the refrigeration circuit, respectively, and the outlet end is connected to the cooling circuit from the inlet end to the outlet end. An expansion valve, an evaporator, and a first on-off valve are respectively interposed in order from the inlet end to the outlet end of the refrigeration circuit. 1st
The on-off valve outlet side and the evaporator outlet side of the refrigeration circuit are connected by a bridge circuit, and a second on-off valve is interposed in the bridge circuit, and the first on-off valve is opened and the second on-off valve is opened. By closing, the cooling or freezing operation state is entered, and by opening both the first and second on-off valves, the cooling operation state is entered, and further by closing the first on-off valve and the second on-off valve. By opening the valve, the refrigeration operation state is established.

Therefore, although a single vane compressor can be used for both cooling and refrigeration, it is possible to eliminate the disadvantages such as a decrease in volumetric efficiency and the accompanying increase in the size of the compressor, and it is possible to combine both cooling and refrigeration. Simultaneous operation or operation of only one of cooling and freezing can be selected as needed.Furthermore, vane type compressors have a conventional structure where the suction chamber is divided into two by a partition wall, and each has its own suction port. Since it consists only of providing
It has the advantage that the price is almost the same as the conventional one.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, in which Fig. 1 is a partially sectional side view of a vane type compressor used in the device of the present invention, Fig. 2 is a sectional view taken along the - line in Fig. 1, and Fig. 3 is a sectional view taken along the - line in Fig. 1. The figure is a sectional view taken along the same line, and FIG. 4 is a configuration diagram of the cooling and freezing apparatus of the present invention incorporating a vane type compressor. 1a...Front head, 2...Pump housing, 2a...Cam ring, 2b...Front side block, 2c...Rear side block, 2
d... Cam circumferential surface, 3... Rotor, 3a... Slit, 3b... Vane, 5... Rotating shaft, 8 ₁ , 8 ₂ ...
...Pump working chamber, 9 ₁ , 9 ₂ ...Inflow port, 10 ₁ ,
10 ₂ ... Outlet, 11 ₁ , 11 ₂ ... Suction chamber, 1
2 ₁ , 12 ₂ ... Suction port, 15 ... Discharge port, 16...
...Capacitor, 17...Receiver tank, 18 ₁ ,
18 ₂ ... expansion valve, 19 ₁ , 19 ₂ ... evaporator, 20 ... first on-off valve, 22 ... second on-off valve,
21... Bridge circuit,... Cooling circuit,...
Refrigeration circuit, C... Vane type compressor.

Claims (1)

[Scope of utility model registration request] A circular rotor supported by a rotating shaft is fitted into a pump housing formed by a cam ring having an oval cam circumferential surface on its inner surface, and a front side block and a rear side block joined to both sides of the cam ring. Two pump working chambers are defined within the pump housing by the outer circumference of the rotor, the cam circumferential surface, the front side block, and the inner surface of the rear side block, and the rotor has a plurality of slits formed in the radial direction; A plate-shaped vane is fitted into each of these slits so as to be movable back and forth, and as the rotor rotates, the vane moves back and forth through the slit with one end of the vane in sliding contact with the circumferential surface of the cam, and becomes integral with the rotor. By rotating, the refrigerant is transferred to the two installed in the front head.
Two suction chambers in the front head and one opening into each of these suction chambers from the two suction ports.
The refrigerant is sucked into the two pump working chambers through two inlets, and the sucked refrigerant is compressed in the two pump working chambers and flows out from each outlet, and then discharged from a single discharge port. a multi-chamber vane type compressor, the outlet ends of a cooling circuit and a refrigeration circuit which are parallel to each other are respectively connected to the two suction ports of the vane type compressor;
The single discharge port is connected to the inlet of a receiver tank via a condenser, the outlet of the receiver tank is connected to the inlet ends of the cooling circuit and the refrigeration circuit, respectively, and the outlet end is connected to the cooling circuit from the inlet end to the outlet end. An expansion valve, an evaporator, and a first on-off valve are respectively interposed in order from the inlet end to the outlet end of the refrigeration circuit; 1st
The on-off valve outlet side and the evaporator outlet side of the refrigeration circuit are connected by a bridge circuit, and a second on-off valve is interposed in the bridge circuit, and the first on-off valve is opened and the second on-off valve is opened. By closing, the cooling or freezing operation state is entered, and by opening both the first and second on-off valves, the cooling operation state is entered, and further by closing the first on-off valve and the second on-off valve. Air conditioner and refrigeration equipment that can be put into refrigeration operation by opening the valve.