JPH0710214Y2 - Refrigerant circuit valve - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to a valve used for a refrigerant circuit in an air conditioner in which an indoor unit and an outdoor unit are separated.

[Conventional technology]

Conventionally, in a separate type air conditioner, an on-off valve that can be individually and independently opened and closed is provided in each of two circuits, a gas refrigerant circuit and a liquid refrigerant circuit that connect an indoor unit and an outdoor unit.

[Problems to be solved by the device]

However, this conventional technique has a large number of parts and has a problem in operability. To deal with this, an on-off valve for two refrigerant circuits, in which one valve is provided in both the liquid and gas circuits (for example, JP 61-23718 and JP 61-237).
No. 19, Japanese Patent Publication No. 58-54348, and Japanese Utility Model Publication No. 57-93780) are proposed.

However, in JP-B-58-54348, etc., the valve rod that opens and closes both the liquid and gas circuits is completely integrated, so during air purging it is not possible to slightly open the liquid side and close the gas side. Air remains in the circuit and cannot be completely replaced with CFC gas.Furthermore, in Japanese Utility Model Publication No. 61-23718, the valve stem is coaxial and separate, so the diameter is large and the cost is high. It was

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above problems that have been problems in the related art, and to provide a valve for a refrigerant circuit having a small number of parts, a simple structure, and good operability.

[Means for Solving the Problems]

To achieve the above object, the present invention relates to a refrigerant circuit valve for a separate type air conditioner, comprising a hollow cylindrical valve body having a circular cross-section passage in which a diameter increases in order from one end to the other end. The valve body includes a circular cross-section passage and a valve rod axially slidably inserted with a gap in the radial direction, and the valve body has a service port having a stop valve on one end side. , An operation port on the other end side, and a gas side first hole, a gas side second hole, a liquid side first hole and a liquid side second hole on the side surface between the service port and the operation port with respect to the circular section passage. Check that the valve rod is slidably held with respect to the valve rod and is biased with a predetermined pressure in the direction of blocking between the gas side first hole and the gas side second hole. Valve, the gas side first hole / gas side second hole and the liquid side first hole / liquid side second A piston having a diameter larger than the check valve for shutting off the space, a liquid side valve body having a diameter larger than the piston for shutting off or communicating between the liquid side first hole and the liquid side second hole, and a diameter larger than the liquid side valve body The gist is that the operation parts of are provided in order.

〔Example〕

 The present invention will be described below based on the illustrated embodiments.

In the figure, 1 is an outdoor unit, 2 is an indoor unit, and in this outdoor unit 1, an outdoor heat exchanger 3, a compressor 4, a four-way switching valve 5, a capillary tube 6 are arranged, and an indoor unit 2
An indoor heat exchanger 7 is arranged inside, and gas side refrigerant circuits 41, 42 and liquid side refrigerant circuits 43, 44 are formed and arranged between the indoor unit 2 and the outdoor unit 1, and the refrigerant passes through both circuits. It circulates between the indoor unit and the outdoor unit to perform desired cooling or heating. Outdoor unit 1,
The refrigerant circuit valve 10 of the present invention is arranged in the liquid / gas refrigerant circuit between the indoor units 2.

As shown in detail in FIGS. 1 and 2, the valve 10 has a circular cross-section passage 12 formed inside a valve body 11 of a required length, and a valve rod operation port 13 formed at one end of the valve body 11. In addition, the valve body 11 is divided into two parts in the longitudinal direction, for example, the upper half part is the gas side valve V1 and the lower half part is the liquid side valve V2.

A cylinder chamber 14 is provided at the center of the circular cross-section passage 12, and a valve chamber 15 for the gas valve V1 and a valve chamber 14 for the liquid valve V2 are provided on both sides of the cylinder chamber 14.
a and a service port above the valve chamber 15 of the gas side valve V1, that is, at the upper end of the valve body 11.
16 is provided. The diameter of the circular cross-section passage 12 is different between the valve chamber 15 of the gas side valve V1, the cylinder chamber 14, the valve chamber 14a of the liquid side valve V2, and the operation port 13, and the valve chamber 15 of the gas side valve V1 has a small diameter and a cylinder. The chamber has a medium diameter, the valve chamber 14a of the liquid side valve V2 has a large diameter, the operation port 13 has a maximum diameter, and the valve chamber 15 of the gas side valve V1 of the circular sectional passage 12 has a gas side first hole 20 and a gas side first hole. 2 holes 19
The liquid side first hole 21 and the liquid side second hole 22 are opened in the valve chamber 14a of the liquid side valve V2. Further, the liquid side first hole 21 and the liquid side second hole
A valve seat, that is, a liquid side valve seat 17 and a gas side valve seat 18 are provided between the hole 22 and between the gas side first hole 20 and the gas side second hole 19, respectively.

A valve rod 30 is slidably fitted in the circular cross-section passage 12 of the valve body 11 configured as described above, a stop valve 23 is screwed into the service port 16, and a cap nut 24 is attached to the end of the valve body 11. The cap nut on the outside of the operation port 13 on the opposite side.
25 is screwed to keep the inside of the valve body 11 airtight.

The valve rod 30 includes an operating portion 31 having a maximum diameter and a liquid side valve element 34 having a large diameter.
And a medium-diameter piston 37 and a small-diameter check valve 35 are formed in series, and when this valve rod 30 is inserted into the circular cross-section passage 12, the operating portion 31, the liquid side valve element 34, the piston 37 and the check valve 35 are Operation port 13, liquid side valve V2 valve chamber 14a, cylinder chamber 1
4 and the gas side valve V1 are fitted in the valve chamber 15, and a ring 40 for retaining the valve rod 30 is fitted near the opening end of the operation port 13. Valve rod
The operation portion 31 of 30 has a hexagonal hole 32 for inserting a wrench on the end surface,
An O-ring 33 is fitted in the annular groove on the peripheral surface to make it airtight, thereby preventing liquid leakage from the valve chamber 14a of the liquid side valve V2. Liquid side valve element 34
The lower part of the screw is screwed on most of the peripheral surface and screwed into the screw surface of the inner peripheral surface of the valve chamber 14a of the liquid side valve V2, and the hexagonal hole 32
When a tool such as a wrench is put in and turned, the entire valve rod 30 advances and retreats with a screw, and the taper surface 36 of the tip of the liquid side valve element 34 presses against the liquid side valve seat 17 so that the refrigerant in the liquid side valve chamber 14a Cut off distribution.
The piston 37 is made airtight by fitting an O-ring 38 in an annular groove on the circumferential surface, and always shuts off the valve chamber 15 of the gas side valve V1 and the valve chamber 14a of the liquid side valve V2 of the circular cross-section passage 12.

The check valve 35 is slidably fitted and supported by a check valve mounting rod 39 protruding from the tip of the valve rod 30 in a slip-prevention manner. Further, a spring S is interposed between the check valve 35 and the piston 37,
This spring pressure causes the check valve 35 to be pressed against the valve seat 18 in the direction of closing the gas side valve V1. The distance by which the check valve 35 can move along the check valve mounting rod 39, that is, the clearance C is about two rotations of the valve rod 30. Further, a check valve mounting rod is provided so that a required amount of gas can flow from the indoor unit 2 to the outdoor unit 1 even when the valve is closed.
39 A lift of a gap C1 is secured between the tip and the inner bottom surface of the check valve 35 and between the end surface of the check valve 35 and the piston 37.

Next, the operation when adjusting the air conditioner using the refrigerant circuit valve 10 of the present invention will be described.

(1) Air Purge When installing an air conditioner shipped from the factory, it is necessary to perform an air purge to replace the air in the refrigerant circuit connecting the outdoor unit 1 and the indoor unit 2 with CFC gas.

At this time, the valve rod 30 of the valve 10 is rotated about 1/4 to separate the liquid side valve element 34 from the liquid side valve seat 17 to open the liquid side valve V2,
Fluorocarbon gas in the outdoor unit 1 is passed through the refrigerant circuit to the indoor unit 2
To the first hole 20 on the gas side of the valve 10.

Then, the stop valve 23 provided in the service port 16 is opened to release the air in the refrigerant circuit.

At this time, the check valve 35 does not open because the lift for 1/4 rotation of the valve rod 30 is sufficiently smaller than the clearance C and is pressed by the spring S, so that the gas side refrigerant circuit of the outdoor unit is opened to the atmosphere. Air purge can be done without releasing it.

(2) Pump down When an air conditioner in use is relocated for reasons such as moving, it is necessary to pump down to collect the CFC gas in the refrigerant circuit to the outdoor unit 1.

At this time, the cooling operation is performed with the liquid side valve element 34 seated on the liquid side valve seat 17 and the liquid side valve V2 closed. At this time, the check valve 35 is opened by the clearance C1 by overcoming the pressing force of the spring S by the suction of the compressor 4, the gas on the indoor unit 2 side flows to the compressor 4, and the gas is collected on the outdoor unit 1 side. You can Compressor 4 after collection
If this is stopped, the check valve 34 will close and the recovered gas will not flow back to the indoor unit 2 side.

(3) Vacuuming and gas recharging The service port 16 can be used to evacuate the refrigerant circuit and recharge gas.

It should be noted that this embodiment is only intended to clarify the technical contents of the present invention, and the present invention is not limited to this embodiment, and may be modified within the scope of the utility model registration claim. It goes without saying that it can be implemented by

[Effect of device]

According to the present invention, in a valve for a refrigerant circuit of a separate type air conditioner, a hollow cylindrical valve body having a circular cross-section passage formed therein and a circular cross-section passage and a radial gap are provided in the valve body. And a valve rod that is slidably inserted in the axial direction. The valve body has a service port, a gas-side first hole, a gas-side second hole, a liquid-side first hole, a liquid-side second hole, and The operation port is opened in order with respect to the circular cross-section passage, and the valve rod is slidably held with respect to the valve rod and predetermined in a direction to block between the gas side first hole and the gas side second hole. A check valve that is biased by pressure, a piston that blocks between the gas-side first hole / gas-side second hole and the liquid-side first hole / liquid-side second hole, the liquid-side first hole and the liquid-side second hole Since the liquid-side valve element and the operating part that shut off or communicate with each other were provided in order, the separation valve that previously required two The refrigerant circuit valves of the air conditioner can be integrated into one, and the air purge and pump down can be performed while the outdoor unit and the indoor unit are connected. Especially, at the time of the air purge, the gas side refrigerant circuit of the outdoor unit. It is possible to surely replace with CFC gas without releasing it to the atmosphere.

Further, the circular cross-section passage is formed so that the diameter gradually increases from one end to the other end, the diameter of the piston is larger than the check valve, the diameter of the liquid side valve body is larger than the piston,
Further, by forming the diameter of the operating portion larger than that of the liquid side valve body, the manufacture of the hollow cylindrical valve body and the assembly of the refrigerant circuit valve can be performed very easily and accurately.

This makes it possible to provide a refrigerant circuit valve having a small number of parts, a simple structure, and good operability.

[Brief description of drawings]

FIG. 1 is a sectional view of a refrigerant circuit valve of the present invention, and FIG. 2 is an enlarged explanatory view of a main part. 10 is a valve for a refrigerant circuit, 11 is a valve body, 12 is a circular cross-section passage, 13 is an operation port, 16 is a service port, 19 is a gas-side second hole, 20 is a gas-side first hole, and 21 is a liquid-side second hole. A hole, 22 is a first hole on the liquid side, 30 is a valve rod, 34 is a valve body on the liquid side, 35 is a check valve, and 37 is a piston.

Claims (1)

[Scope of utility model registration request] 1. A refrigerant circuit valve for a separate type air conditioner, comprising a hollow cylindrical valve body (11) in which a circular cross-section passage (12) whose diameter gradually increases from one end to the other end is formed. The valve body (11) includes the circular cross-section passage (12) and a valve rod (30) slidably inserted in the axial direction with a gap in the radial direction. Is a service port (16) having a stop valve (23) on one end side, an operation port (13) on the other end side, and a gas side first on the side surface between the service port (16) and the operation port (13). 1
The hole (20), the gas-side second hole (19), the liquid-side first hole (21) and the liquid-side second hole (22) are sequentially opened to the circular cross-section passage (12), and the valve rod ( 30) is slidably held with respect to the valve rod (30) and is biased by a predetermined pressure in a direction to shut off between the gas side first hole (20) and the gas side second hole (19). Check valve (35), the gas side first hole (20), the gas side second
A piston (37) having a diameter larger than that of the check valve (35) for blocking between the hole (19) and the liquid-side first hole (21) / liquid-side second hole (22), and the liquid-side first hole (21) ) And the liquid side second hole (22) are blocked or communicated with each other, the liquid side valve body (34) having a larger diameter than the piston (37) and the operation portion (31) having a larger diameter than the liquid side valve body (34). A valve for a refrigerant circuit, characterized in that