JPH0829019A - Expansion valve for cooler device - Google Patents

Abstract

PURPOSE:To make the control device for use in controlling a refrigerant supplying amount from a main body of an expansion valve, attachable/detachable, and improve the handling operations such as repairing and cleaning in the expansion valve of a cooler device in which a valve mechanism is related to a displacement of a diaphragm to adjust a degree of opening of the valve. CONSTITUTION:An inlet 12 for refrigerant flowing from a condensor and an outlet 13 for refrigerant flowing toward an evaporator are opened. A main body 10 is formed such that the inlet 12 and the outlet 13 are communicated to each other to open an inner opened hole 11. A control device 20 having a thermo-sensitive case 21 and a valve mechanism arranged in a refrigerant passage ranging from the inlet 12 to the outlet 13 integrally assembled from each other is formed, the control device 20 is inserted into the inner opened hole 11 and assembled so as to cause the control device 20 to be removably installed at the main body 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an expansion valve for a cooling device, which is installed in a cooling cycle of a cooling device for an automobile or the like and adjusts a refrigerant supply amount to an evaporator according to a change in heat load.

[0002]

2. Description of the Related Art JP-A-61-70355, JP-A-61-202055 and the like are disclosed as expansion valves which are installed in front of an evaporator in a cooling cycle of an air conditioner for an automobile or the like. Such an expansion valve contains a diaphragm inside a temperature sensitive case that detects the refrigerant temperature on the outlet side of the evaporator and fluctuates the enclosed gas pressure in the box, and is a valve mechanism that is biased in the direction opposite to the displacement direction of the diaphragm. Is provided in the refrigerant passage in the main body. Then, the high-pressure refrigerant from the condenser is adiabatically expanded and supplied to the evaporator, and the valve mechanism is interlocked with the displacement of the diaphragm to adjust the valve opening degree to adjust the refrigerant supply amount to the evaporator. In such expansion valves, a temperature-sensitive case is installed in a main body having a refrigerant passage extending from the inlet to the outlet, and an operating rod for transmitting displacement of the diaphragm, a ball valve driven by the operating rod, and a throttle in the refrigerant passage are installed in the main body. It is manufactured by incorporating components such as a valve seat that forms a portion and a spring that biases the ball valve in the valve opening direction. Further, the expansion valve is generally connected by piping during the cooling cycle by a flange seal through packing.

[0003]

In the expansion valve having such a structure, the parts constituting the valve mechanism are integrally incorporated in the main body and cannot be disassembled. Since the main body had to be removed and replaced with a new one, handling such as repair and cleaning was inconvenient and the service cost was high. Also, piping with flange seals
If the packing is defective or damaged, there is a danger that refrigerant will leak from the seal immediately.

An object of the present invention is to provide an expansion valve for a cooling device having a novel structure to solve these problems, and to form a control unit for controlling the amount of refrigerant supplied to the evaporator. The unit is configured to be detachable from the expansion valve main body to improve handling such as repair and cleaning. Then, during the cooling cycle, the expansion valve can be welded to be connected by piping, and the object is to eliminate the risk of refrigerant leakage from the connection point.

[0005]

In order to achieve such an object, the present invention has an expansion valve for a cooling device, in which the inlet of the refrigerant from the condenser and the outlet of the refrigerant to the evaporator are opened, and the inlet and the outlet are in communication with each other. An internal aperture is opened to form the body. Then, the temperature sensitive case and the valve mechanism arranged in the refrigerant passage from the inlet to the outlet are integrally assembled to form a control unit, and the control unit is inserted from the opening surface into the internal opening to assemble and control. The unit is configured to be detachable from the main body.

Further, a cylindrical mounting screw is joined to the bottom surface of the temperature sensitive case, and the mounting screw is screwed to the upper end of the internal opening. Then, the main body is welded and connected by piping.
Hereinafter, the configuration of the present invention will be specifically described with reference to the embodiments of the drawings.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The expansion valve for a cooling system shown in the drawing is installed in a cooling system for an automobile, and the cooling cycle of the refrigerant is constructed as shown in FIG. Here, the expansion valve (1) is connected to the evaporator (2) by forming a flow passage communicating with the high pressure side of the compressor (3) driven by the running engine and a flow passage communicating with the low pressure side. It Then, the condenser (4), the receiver (5), and the high-pressure side flow passage of the expansion valve (1) are connected to the high-pressure side of the compressor (3) to connect the evaporator (2) to the low-pressure side of the expansion valve (1). It is connected to the low pressure side of the compressor (3) via the flow passage. In this cooling cycle, the high-temperature high-pressure gas refrigerant adiabatically compressed by the compressor (3) releases heat to the outside by the condenser (4) to become a low-temperature high-pressure liquid refrigerant, which is adiabatically expanded by the expansion valve (1). It becomes atomized refrigerant and is supplied to the evaporator (2). Then, the evaporator (2) absorbs heat from the outside and evaporates and evaporates, the blown air is cooled and is used for cooling the interior of the automobile, and the vaporized gas refrigerant is the compressor (3).
Inhaled to circulate the cooling cycle.

A main body (10) of the expansion valve (1) is formed in a box shape, and an internal opening (11) having a bottom is opened at an axial center from an upper surface, and a refrigerant inlet (1) from a condenser is formed on a side surface.
2), on the side opposite to this, the outlet (13) connected to the inlet of the evaporator at the lower position, the inlet (14) connected to the outlet of the evaporator at the position above this, and the inlet (12) on the opposite side. The outlet (15) is opened at the upper position. And these entrances (12), (1
4), outlets (13), (15) communicate with the internal aperture (11).

A diaphragm (22) is housed in a temperature sensitive case (21) in which a refrigerant gas as a temperature responsive body is sealed in a box, and a peripheral edge of the diaphragm (22) is stored to detect the refrigerant temperature on the outlet side of the evaporator (2). A capillary tube (23) having a temperature sensitive tube connected to its tip is opened in the box of the temperature sensitive case (21). The cylindrical mounting screw (2
5) is joined, and an internal thread portion (16) that is screwed to the mounting screw (25) is formed at the upper end of the internal clearance hole (11). The pipe body (27) is joined to the lower end of the mounting screw (25), and the tubular body (30) is joined to the lower end of the pipe body (27) in this order, and the inlet (14) and the outlet ( 1
5), a through hole (28) is formed at a height position corresponding to 5), and a through hole (29) is formed at a height position corresponding to the inlet (12).
A through hole (31) is formed at a height position corresponding to the outlet (13) on the side wall of (0). A connecting rod (3) whose upper end is in contact with the rear surface of the diaphragm (22) is attached to the axial center of the tubular body (27).
2), the actuating rod (34) is provided in the lower stage of the connecting rod (32) and abuts on the inner peripheral surface of the pipe body (27) to divide the inside of the pipe body (27) into upper and lower parts to move in the axial direction. Guide body to guide (3
The connecting rod (32) and the operating rod (34) are connected via 3). A valve seat (35) having a throttle portion formed in the refrigerant passage is provided at a lower end position in the pipe body (27), and a ball valve (36) is provided at a lower end of an operating rod (34) having the valve seat (35) inserted therethrough. ) Is abutted. An expansion chamber for the refrigerant that has passed through the throttle portion is formed inside the tubular body (30), and a spring (38) for urging the ball valve (36) in the valve closing direction is screwed from the bottom surface of the tubular body (30). The adjusting screw (37) adjusts and holds the urging force, and is housed in the tubular body (30). Tube (2
The ring body (40) that abuts the inner peripheral surface of the internal opening (11) is joined to the middle position of the outer peripheral surface of (7), and the ring body (40) sandwiches the O-ring and the internal opening ( 11) The inside is divided into upper and lower parts. Then, the temperature sensitive case (21) and the mounting screw (2
5), mounting screw (25) and tubular body (27), tubular body (27)
The tubular body (30), the tubular body (27), and the ring body (40) are joined by brazing in a heating furnace, and the temperature-sensitive case (21) housing the diaphragm (22) and the connecting rod (32). ), The actuating rod (34), the ball valve (36), the valve seat (35), the spring (38) and other valve mechanisms are incorporated into the control unit (20).

In this expansion valve (1), a mounting screw (25) is screwed into an internal thread (16) at the upper end of the internal opening (11),
The control unit (20) is inserted into the internal opening (11) from the opening surface of the upper surface of the main body (10) for assembly, and is rotated in the direction in which the mounting screw (25) is removed.
0) can be easily detached from the main body (10). Inside the internal opening (11), the ring (4
0) is divided into upper and lower parts, and inside the main body (10), the entrance (1
A high-pressure side flow passage from 2) to the outlet (13) and a low-pressure side flow passage from the inlet (14) to the outlet (15) are formed, and a refrigerant passage from the inlet (12) to the outlet (13). A valve mechanism is arranged inside. And the entrance (12), (1
4), outlets (13) and (15) are connected by welding pipes, the outlet (13) is connected to the inlet of the evaporator (2) and the inlet (14) is connected to the outlet of the evaporator (2) to form the main body ( 10) is connected by piping.

In the expansion valve (1), the temperature sensing cylinder detects the temperature of the refrigerant on the outlet side of the evaporator (2), the pressure of the gas enclosed in the temperature sensing case (21) fluctuates, and the diaphragm (22). Is displaced, and the actuating rod (3
4) drives the ball valve (31) and the diaphragm (2
The valve opening is adjusted in conjunction with the displacement of 2). Entrance (1
The liquid refrigerant flowing in from 2) flows through the through hole (29) into the tubular body (2
7) flows into the inside, passes through the valve seat (35), and passes through the cylindrical body (30).
The refrigerant having a flow rate according to the valve opening degree of the ball valve (31) is adiabatically expanded into atomized refrigerant, passes through the through hole (31) and is supplied from the outlet (13) to the evaporator (2). To be done. In this way, the refrigerant supply amount is adjusted according to the fluctuation of the heat load of the evaporator (2), and the gas refrigerant vaporized in the evaporator (2) passes through the flow passage from the inlet (14) to the outlet (15) and is compressed. Inhaled in (3).

[0012]

The characteristic effects of the present invention are as follows. An internal opening (11) communicating with an inlet (12) of the refrigerant from the condenser (4) and an outlet (13) of the refrigerant to the evaporator (2) is opened in the main body (10) to form a temperature-sensitive case (21). A control unit (20) integrally assembled with a valve mechanism is formed, and the control unit (20) is inserted into the internal opening (11) from the opening surface to assemble the control unit (20) from the main body (10). Since it is configured to be removable,
In the case of a malfunction or failure such as dust mixing, only the control unit (20) can be detached from the main body (10) for inspection and replacement. Therefore, it is excellent in handling such as repair and cleaning, and can reduce the labor and cost of service, and is particularly useful as an expansion valve for piping in an automobile air-conditioning system with limited installation space and work space. is there. Then, a cylindrical mounting screw (25) is joined to the bottom surface of the temperature-sensitive case (21), and the mounting screw (25) is screwed to assemble, so that the control unit (20) can be attached and detached very easily. Is what you can do.

In addition, since it is not necessary to remove the main body (10) in the case of a failure, it is possible to weld the main body (10) to make a pipe connection, and a solid connection can be made without using a sealing material. It is possible to prevent the leakage of the refrigerant and solve the situation that the cooling capacity is deteriorated or the operation is impossible.

Further, the components for controlling the flow of the refrigerant are individually assembled as a control unit (20), and the control unit (20) is inserted into the internal opening (11) to be manufactured. It has excellent functions such as being suitable for mass production.

The expansion valve for a cooling device according to the present invention is not limited to the above embodiment, but may be used as an expansion valve in which a low-pressure side flow passage is not formed in the main body, and the condenser (4 (4) is applied to expansion valves of various forms, such as a structure in which the inlet of the refrigerant from (1) is opened on the side surface of the main body and the outlet of the refrigerant to the evaporator (2) is opened on the bottom surface of the main body.

[Brief description of drawings]

FIG. 1 is a sectional view of a main body and a control unit of an embodiment of the present invention in a disassembled state.

FIG. 2 is a sectional view showing a state in which the main body and the control unit are similarly assembled.

FIG. 3 is a piping diagram of the same cooling cycle.

[Explanation of symbols]

 2 Evaporator 4 Capacitor 11 Internal opening 10 Main body 12 Inlet 13 Outlet 21 Temperature sensitive case 22 Diaphragm 20 Control unit 25 Mounting screw

Claims (3)

[Claims] 1. A temperature-sensitive case (2) in which the temperature of the refrigerant on the outlet side of the evaporator (2) is detected to change the pressure of the gas enclosed in the box.
1) The diaphragm (22) is housed inside, and a valve mechanism biased in the direction opposite to the displacement direction of the diaphragm (22) is provided in the refrigerant passage in the main body (10) to displace the diaphragm (22). In an expansion valve for a cooling device in which a valve mechanism is interlocked to adjust the valve opening, a refrigerant inlet (12) from a condenser (4) and a refrigerant outlet (13) to an evaporator (2) are opened, (1
2), the internal opening (11) communicating with the outlet (13) is opened to form the body (10), and the temperature sensitive case (21) and the inlet (12) to the outlet (13) are formed.
Forming a control unit (20) integrally assembled with a valve mechanism arranged in the refrigerant passage leading to the refrigerant passage, and inserting the control unit (20) into the internal opening (11) from the opening surface to assemble the control unit (20). An expansion valve for a cooling device, wherein (20) is configured to be detachable from the main body (10). 2. The cooling according to claim 1, wherein a cylindrical mounting screw (25) is joined to the bottom surface of the temperature sensitive case (21), and the mounting screw (25) is screwed to the upper end of the internal opening (11). Expansion valve for equipment. 3. The expansion valve for a cooling device according to claim 1, wherein the main body (10) is welded and connected by piping.