JPH0814711A - Solenoid valve-integrated receiver and refrigerating cycle - Google Patents

Abstract

PURPOSE:To suppress pressure variations (pressure increase) to be caused when a solenoid valve is closed, control vibrations of refrigerant pipes and a rear side evaporator and reduce an impact noise to be accompanied by pressure variations. CONSTITUTION:A solenoid valve-integrated receiver 4 is formed integrally with a receiver 14, a three-way branching body 15 and a solenoid valve 16. The three-way branching body 15 is screwed and fixed to a vessel main body 14a of the receiver 14 and provided with an inlet passage 15a communicating to an outlet pipe 14c of the receiver 14, a first outlet passage 15b and a second outlet passage 15c, both communicating to the inlet passage 15a. The first outlet passage 15b is connected to a main passage 9 for a refrigerant which communicates to a front side evaporator, while the second outlet passage 15c is connected to a sub-passage 10 for the refrigerant, which communicates to a rear side evaporator. The solenoid valve 16 screwed and fixed to the three-way branching body 15 opens the second outlet passage 15c of the three-way branching body 15 when a coil 16e receives the supply of power, and closes the second outlet passage 15c when the supply of power to the coil 16e is stopped.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solenoid valve integrated receiver used in a refrigeration cycle.

[0002]

2. Description of the Related Art Conventionally, in an air conditioner mounted on a passenger car or a wagon vehicle, there is a dual air conditioner system capable of independently cooling the front seat side and the rear seat side in a passenger compartment. This system includes a front-side evaporator that cools the front seats and a rear-side evaporator that cools the rear seats. The front-side evaporator and the rear-side evaporator are combined in one refrigeration cycle. An electromagnetic valve is installed upstream of the rear evaporator so that the refrigerant can be stopped only in the rear evaporator by being connected in parallel. Therefore, when the rear seat side is not cooled, the electromagnetic valve can be closed to stop the flow of the refrigerant to the rear side evaporator.

[0003]

However, in the system described above, the receiver 200 for storing the liquid refrigerant is arranged upstream of the solenoid valve 100 as schematically shown in FIG. When closed, the flow of the high-pressure liquid refrigerant, which has been flowing through the refrigerant pipe 300, is suddenly stopped, so that a so-called water hammer phenomenon that causes a transient pressure fluctuation (pressure increase) occurs. As a result, the refrigerant pipe 300
Also, the rear evaporator may vibrate, and a shock noise (water hammer noise) may be generated due to pressure fluctuation.

This water hammer phenomenon is caused by the solenoid valve 100.
Is closed and the flow of the liquid refrigerant is stopped, the kinetic energy of the high-pressure liquid refrigerant that has been flowing through the refrigerant pipe 300 from the receiver 200 to the solenoid valve 100 is converted into energy for compressing the liquid refrigerant, and the compression energy Is caused by a sudden rise in. Therefore, in order to reduce the impact pressure due to the water hammer phenomenon, the kinetic energy of the liquid refrigerant, which is the compression energy for compressing the liquid refrigerant when the solenoid valve 100 is closed, may be reduced.

This kinetic energy increases as the distance L from the receiver 200 to the solenoid valve 100 increases, so in order to reduce the impact pressure when the solenoid valve 100 is closed, the receiver 200 to the solenoid valve 100. Distance to
It can be said that shortening is effective.

When the solenoid valve is mounted on the vehicle body side, an elastic body such as rubber is interposed between the mounting bracket of the solenoid valve and the vehicle body side to prevent vibration, or to use a muffler or a hose. There is a method such as damping the pressure fluctuation when the solenoid valve is closed, but none of them can achieve sufficient effect, and the use of separate parts also leads to higher costs. There is. The present invention has been made based on the above circumstances, and an object thereof is to suppress vibration of pipes and evaporators due to a so-called water hammer phenomenon that occurs when a solenoid valve is closed, and to reduce impact noise due to pressure fluctuation. It is to plan.

[0007]

In order to achieve the above object, the present invention provides a container main body capable of storing a predetermined amount of refrigerant therein, and a refrigerant stored in the container main body according to claim 1. A receiver having an outflow passage leading to the outside of the container body, an inlet passage that is assembled to the container body and communicates with the outflow passage, and a first outlet passage that branches from the inlet passage and opens to the outside, respectively. A three-way branch body in which a second outlet passage is formed; and a solenoid valve that has a valve body that can open and close the second outlet passage and that drives the valve body by using electromagnetic force, The technical means is to integrate the receiver, the three-way branch body, and the solenoid valve.

According to a second aspect of the present invention, in the refrigeration cycle in which the first refrigerant evaporator and the second refrigerant evaporator are provided for one refrigerant compressor, the electromagnetic valve integrated receiver according to the first aspect is provided. The first refrigerant passage having the first refrigerant evaporator is connected to the first outlet passage of the three-way branch body, and the second refrigerant evaporator is provided in the second outlet passage. It is characterized in that the second refrigerant passage that it has is connected.

According to a third aspect of the present invention, the first refrigerant passage is provided with a first pressure reducing means for decompressing and expanding the refrigerant sent from the receiver upstream of the first refrigerant evaporator, and the second refrigerant is provided. A second decompression means for decompressing and expanding the refrigerant sent from the receiver is provided upstream of the second refrigerant evaporator in the passage.

[0010]

According to the electromagnetic valve integrated receiver of the present invention as set forth in claim 1, the receiver, the three-way branch body, and the electromagnetic valve are integrated so that the receiver and the electromagnetic valve are arranged close to each other. You can That is, the distance between the receiver and the solenoid valve can be reduced as compared with the case where the receiver, the three-way branch body, and the solenoid valve are connected by pipes. As a result, the pressure increase that occurs when the solenoid valve is closed, that is, when the valve body of the solenoid valve closes the second outlet passage of the three-way branch body is mitigated, and the impact pressure due to the water hammer phenomenon can be reduced.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment of a refrigeration cycle equipped with a solenoid valve integrated receiver of the present invention will be described with reference to FIGS. FIG. 1 is a sectional view of a solenoid valve integrated receiver. The refrigeration cycle 1 of the present embodiment is applied to an air conditioner for a vehicle and constitutes a dual air conditioner system capable of independently cooling the front seat side and the rear seat side in a vehicle compartment.

As shown in FIG. 2, the refrigeration cycle 1 includes a refrigerant compressor 2, a refrigerant condenser 3, a solenoid valve integrated receiver 4, a front side expansion valve 5 (first pressure reducing means), and a front side evaporator 6. (First refrigerant evaporator), rear expansion valve 7 (second refrigerant
Pressure reducing means) and rear side evaporator 8 (second refrigerant evaporator), and the front expansion valve 5 and front evaporator between the solenoid valve integrated receiver 4 and the refrigerant compressor 2. A sub-refrigerant passage 10 (second refrigerant passage) having a rear-side expansion valve 7 and a rear-side evaporator 8 is branched and connected in parallel to a main refrigerant passage 9 (first refrigerant passage) having a rear-side expansion valve 7 and a rear-side evaporator 8.

The refrigerant compressor 2 is driven by the running engine 12 of the vehicle through the electromagnetic clutch 11, and compresses and discharges the sucked gas refrigerant. The refrigerant condenser 3 condenses and liquefies the high-temperature and high-pressure refrigerant discharged from the refrigerant compressor 2 by receiving air from the cooling fan 13.

As shown in FIG. 1, the electromagnetic valve integrated receiver 4 stores the refrigerant condensed and liquefied in the refrigerant condenser 3 and sends out the liquid refrigerant, and the refrigerant flowing out of the receiver 14 is expanded on the front side. A three-way branch body 15 for branching and flowing into the valve 5 and the rear-side expansion valve 7, and a solenoid valve 16 for opening and closing a refrigerant passage (described below) leading to the rear-side expansion valve 7 of the three-way branch body 15 are integrated. It has been transformed. The receiver 14, the three-way branch body 15, and the solenoid valve 16
Each structure of will be described later.

Front side expansion valve 5 and rear side expansion valve 7
Are arranged upstream of the front side evaporator 6 and the rear side evaporator 8 in the main refrigerant passage 9 and the sub refrigerant passage 10, respectively, and decompress and expand the refrigerant guided from the receiver 14. The front-side expansion valve 5 and the rear-side expansion valve 7 of the present embodiment pass through the refrigerant so that the superheat degree of the outlet refrigerant flowing from the front-side evaporator 6 and the rear-side evaporator 8 becomes substantially constant. It is a temperature-controlled expansion valve that regulates the flow rate.

Front side evaporator 6 and rear side evaporator 8
Are the front side expansion valve 5 and the rear side expansion valve 7, respectively.
Low-temperature low-pressure refrigerant that has been decompressed and expanded by the indoor fan 17, 1
The heat exchange with the air blown by 8 is performed.

Next, the structure of the solenoid valve integrated receiver 4 will be described with reference to FIG. The receiver 14 includes a container body 14a capable of storing a predetermined amount of refrigerant therein. The container body 14a is communicated with the refrigerant outlet of the refrigerant condenser 3 by a refrigerant pipe 19 and is connected to the refrigerant condenser 3
An inflow passage 14b for allowing the condensed and liquefied refrigerant to flow into the container body 14a is formed, and an outlet pipe 14c for guiding the liquid refrigerant stored in the container body 14a to the outside of the container body 14a (outflow passage of the present invention) Is provided. The outlet pipe 14c has a tip that extends to the bottom of the container body 14a and opens, and a trailing end that opens to a recess 14d formed in the head of the container body 14a. This concave portion 14d is a three-way branch body 15
It is formed for assembling.

The three-way branch body 15 has an inlet passage 15a, a first outlet passage 15b, and a second outlet passage 15c. One end (the lower end in FIG. 1) of the inlet passage 15a is opened to the outside as an inflow port, and the other end is connected to an opening hole opened for inserting the valve body of the solenoid valve 16 on the side opposite to the inflow port. The first outlet passage 15b branches at a right angle from the middle of the inlet passage 15a, and its tip opens to the outside as a first outlet. The second outlet passage 15c communicates with the inlet passage 15a through the opening hole, extends in a direction perpendicular to the inlet passage 15a (the same direction as the first outlet passage 15b), and has a tip opening to the outside as a second outlet. To do.

A solenoid valve 16 is provided at the other end of the inlet passage 15a.
Is formed with a conical valve seat 15d on which the plunger 16a (valve element of the present invention) is seated, and the plunger 16a is seated on the valve seat 15d so that the inlet passage 15a and the second outlet passage 15c are separated from each other. Shut off (hereinafter second outlet passage 15
c), the valve seat 15d to the plunger 16a.
The inlet passage 15a and the second outlet passage 15c communicate with each other due to the separation. On the other hand, the inlet passage 15a and the first outlet passage 15
There is always continuity with b.

A flange 15e is provided on the outer periphery of the inlet passage 15a on the open end side, and a tip end side of the flange 15e is provided as a joint portion 15f for assembling with the container body 14a. Further, pipe joint portions 15g and 15h for connecting to the refrigerant pipes (the main refrigerant passage 9 and the sub-refrigerant passage 10) are provided on the outer peripheries of the first outlet passage 15b and the second outlet passage 15c on the opening end side. .

The three-way branch body 15 has an inlet passage 15a in a recess 14d formed in the container body 14a of the receiver 14.
The container main body 1 by screwing the joint portion 15f provided on the outer periphery of the container
It is fixed to 4a. As a result, the outlet pipe 14c of the receiver 14 and the inlet passage 15a of the three-way branch body 15 communicate with each other. The assembly portion of the three-way branch body 15 and the container body 14a is a flange 15 provided on the outer circumference of the inlet passage 15a.
It is sealed by an O-ring 20 interposed between e and the container body 14a.

The first outlet passage 15b is connected to the main refrigerant passage 9 via a pipe joint portion 15g, and the second outlet passage 15c is connected to the auxiliary refrigerant passage 1 via a pipe joint portion 15h.
Connected with 0. The refrigerant passage communicating with the rear expansion valve 7 described above is the second outlet passage 15c.

The solenoid valve 16 is connected to the three-way branch body 15 by a connecting cylinder 16b, a cylindrical plunger cylinder 16c connected to the connecting cylinder 16b, and a bobbin 16d wound around the outer periphery of the plunger cylinder 16c. Coil 16 placed
e, the iron core 1 fixed to the upper end side in the plunger cylinder 16c
6f, a plunger 16a slidably arranged in the plunger cylinder 16c, and a spring 16g arranged between the iron core 16f and the plunger 16a in the plunger cylinder 16c to urge the plunger 16a downward in the drawing. It

The solenoid valve 16 is screwed to the three-way branch body 15 by the connecting cylinder 16b in a state where the tip end side of the plunger 16a is inserted into the opening hole of the three-way branch body 15. When the plunger 16a inserted into the opening is moved downward in the drawing in the plunger cylinder 16c, the three-way branch body 1
5 of the valve seat 15d formed in the inlet passage 15a of the valve seat 1 so that the second outlet passage 15c is closed.
It is provided in a conical shape (tapered shape) corresponding to 5d.

In the solenoid valve 16, when the coil 16e is energized, the iron core 16f is generated by the magnetic force generated in the coil 16e.
Is magnetized to become an electromagnet. Therefore, the plunger 16a, which is a magnetic body, is attracted to the iron core 16f against the biasing force of the spring 16g. That is, the inside of the plunger cylinder 16c is moved upward in the drawing. As a result, the tip of the plunger 16a moves away from the valve seat 15d, so that the inlet passage 15a of the three-way branch body 15 and the second outlet passage 15c communicate with each other.

When the coil 16e is de-energized, the magnetic force disappears and the plunger 16a, which has been attracted to the iron core 16f, is pressed by the urging force of the spring 16g. That is, the inside of the plunger cylinder 16c is moved downward in the drawing so that the tip of the plunger 16a moves toward the valve seat 1
By abutting (sit down) on 5d, the second outlet passage 15
Close c.

Next, the operation of this embodiment will be described. B) When cooling both the front and rear seats. The solenoid valve 16 is turned on (the coil 16e is energized) to open the second outlet passage 15c of the three-way branch body 15 (the inlet passage 1).
5a communicates with the second outlet passage 15c). As a result, the high-pressure liquid refrigerant flowing out of the outlet pipe 14c of the receiver 14 flows from the inlet passage 15a of the three-way branch body 15 into both the first outlet passage 15b and the second outlet passage 15c, and the main refrigerant passage 9 and the auxiliary refrigerant passage 9 respectively. It is guided to the refrigerant passage 10.

The refrigerant flowing through the main refrigerant passage 9 and the auxiliary refrigerant passage 10 is decompressed and expanded by the front expansion valve 5 and the rear expansion valve 7 to become a low-temperature low-pressure gaseous refrigerant, and the front evaporator 6 and the rear side, respectively. In the evaporator 8, the latent heat of evaporation is taken from the surrounding air to evaporate. The air cooled by the front side evaporator 6 and the rear side evaporator 8 is sent into the vehicle compartment by the indoor fans 17 and 18, respectively, so that the front seat side and the rear seat side are cooled.

(B) When cooling only the front seat side. The solenoid valve 16 is turned off (the coil 16e is de-energized) to close the second outlet passage 15c of the three-way branch body 15. As a result, the high-pressure liquid refrigerant flowing out from the outlet pipe 14c of the receiver 14 is discharged from the inlet passage 15a of the three-way branch body 15 to the first position.
After flowing only through the outlet passage 15b, being guided to the main refrigerant passage 9 and being decompressed and expanded by the front expansion valve 5, the front evaporator 6 deprives the surrounding air of evaporation latent heat and evaporates. The air cooled by the front side evaporator 6 is supplied to the indoor fan 17
The air is sent to the passenger compartment of the vehicle to cool the front seat.

When the solenoid valve 16 is turned off (when the second outlet passage 15c is closed), the compression energy of the high-pressure liquid refrigerant sharply rises, and a so-called water hammer phenomenon occurs. The compression energy (ΔPmax) in this water hammer phenomenon is calculated by the following formula (Joukowski's formula).
Required by.

[Formula 1] ΔP max = ρ · 2 L / Ts · V × 10 ⁻³ ρ (kg / m ³ ): Liquid refrigerant density L (m): Distance from receiver 14 to solenoid valve 16 (see FIG. 3) V (m / S): Flow velocity

As shown by this equation, it can be understood that the distance L from the receiver 14 to the solenoid valve 16 can be made small in order to suppress the increase ΔPmax of the compression energy. In the present embodiment, the receiver 14 and the solenoid valve 16 are integrated with the three-way branch body 15, so that the receiver 1
4 to the solenoid valve 16 (in this embodiment, the outlet pipe 14c of the receiver 14 and the inlet passage 15a of the three-way branch body 15)
Can be set to a minimum. As a result, the increase in compression energy when the solenoid valve 16 is turned off ΔPma
Since x can be suppressed, the impact force due to the increase ΔPmax of the compression energy becomes small, the vibration of the refrigerant pipe and the rear side evaporator 8 is suppressed, and the water hammer noise is reduced.

The conventional three-way branch body 15 is provided separately from the receiver 14 and the solenoid valve 16 in the middle of the piping. However, in the present embodiment, the three-way branch body 15 is integrated with the receiver 14 together with the solenoid valve 16, so that The number of joints for connecting the branch body 15 and the refrigerant pipe is reduced, and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a solenoid valve integrated receiver.

FIG. 2 is a refrigeration cycle diagram of the present embodiment.

FIG. 3 is a schematic diagram of a receiver and a solenoid valve.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigeration cycle 2 Refrigerant compressor 3 Refrigerant condenser 4 Solenoid valve integrated receiver 5 Front expansion valve (first pressure reducing means) 6 Front evaporator (first refrigerant evaporator) 7 Rear expansion valve (second pressure reducing means) ) 8 rear side evaporator (2nd refrigerant evaporator) 9 main refrigerant passage (1st refrigerant passage) 10 auxiliary refrigerant passage (2nd refrigerant passage) 14 receiver 14a container body 14c outlet pipe (outflow passage) 15 three-way branch body 15a Inlet passage 15b First outlet passage 15c Second outlet passage 16 Solenoid valve 16a Plunger (valve body)

Claims (3)

[Claims] 1. A container main body capable of storing a predetermined amount of refrigerant therein, and a receiver having an outflow passage for guiding the refrigerant stored in the container main body to the outside of the container main body, and b) the container. An inlet passage that is assembled to the main body and communicates with the outflow passage, and a three-way branch body in which a first outlet passage and a second outlet passage that branch from the inlet passage and open to the outside are formed; A solenoid valve for driving the valve body by using an electromagnetic force is provided, and the receiver, the three-way branch body, and the solenoid valve are integrated. A solenoid valve integrated receiver characterized in that 2. A refrigeration cycle comprising a first refrigerant evaporator and a second refrigerant evaporator for one refrigerant compressor, wherein the electromagnetic valve integrated receiver according to claim 1 is provided downstream of the refrigerant condenser. A first refrigerant passage having the first refrigerant evaporator is connected to the first outlet passage of the three-way branch body, and a second refrigerant passage having the second refrigerant evaporator is provided in the second outlet passage. Is connected to the refrigeration cycle. 3. A first decompression means for decompressing and expanding the refrigerant sent from the receiver is provided upstream of the first refrigerant evaporator in the first refrigerant passage, and in the second refrigerant passage. And a second decompression and expansion of the refrigerant sent from the receiver upstream of the second refrigerant evaporator.
The refrigeration cycle according to claim 2, further comprising a decompression unit.