JP2723533B2 - Heat motor type condensing pressure regulating valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a heat motor type condensing pressure regulating valve for controlling condensing pressure in an air conditioner.

2. Description of the Related Art In air-cooled condensers and the like, the capacity changes due to changes in the outside air temperature, and when operated throughout the year, the condensing pressure changes significantly. Since the capacity of the automatic expansion valve is insufficient and the supply amount of the refrigerant to the evaporator becomes insufficient, causing cooling failure, it is necessary to prevent the condensation pressure from falling below a certain limit.

Conventionally, a heat motor type condensing pressure adjustment that can change the set pressure arbitrarily by heating the temperature sensing part with an electric heater to raise the internal pressure of the temperature sensing part and changing the valve opening area with the pressure. Valves are known, but if the heater is abnormally heated due to a trouble in the regulating valve drive circuit (abnormal supply voltage), there is a risk that the pressure inside the thermosensitive cylinder will also abnormally rise and the characteristics will deteriorate. was there.

Problem to be Solved by the Invention The present invention has been made by focusing on the above points,
The heat generation of the heater is effectively transmitted to the temperature-sensitive cylinder, and the abnormal heat generation of the heater is prevented beforehand.

Means for Solving the Problems To achieve the above object, the present invention provides a main body having a first inlet connected to an outlet side of a condenser, a second inlet connected to a high pressure side of a compressor, An outlet connected to the receiver;
A pressure chamber, and a valve body that selectively opens and closes the first inlet and the second inlet according to a pressure change in the pressure chamber,
In a heat motor unit which is arranged apart from the main body and connected to the pressure chamber via a capillary tube, a heater and a thermostat for cutting off a current to the heater are provided to the thermosensitive cylinder. A configuration is adopted in which the thermosensitive cylinder, the heater, and the thermostat are surrounded by a heat insulating material layer, while being provided at positions facing each other with the warm cylinder interposed therebetween.

Embodiment In FIG. 1, V denotes a condensing pressure regulating valve. In a valve body 1, a first inlet C connected to an outlet side of an air-cooled condenser (not shown), and a condenser together with a high pressure side of a compressor. Are formed in a state where valve seats C ′ and B ′ formed at the respective inner ends thereof are opposed to each other at an interval l with a second inlet B connected to the inlet side of the valve. An outlet R communicating with the inlets C and B is formed. The outlet R communicates with a liquid receiver (not shown) provided in a conduit leading to an evaporator (not shown).

A valve body 2 is movably provided within the interval 1 so as to selectively contact the valve seats C 'and B', and is urged by a spring 3 in a direction to close the valve seat B '.

A diaphragm 6 is provided at an upper portion of the valve body 1 by lids 4 and 5, and a pressure chamber 7 is formed outside the diaphragm 6.
An actuating rod 9 is provided between the abutment 8 inside the valve and the valve body 2, and transmits a change in pressure in the pressure chamber 7 to the valve body 2 via the diaphragm 6 and the actuating rod 9.

H denotes a heat motor unit, which has a temperature-sensitive cylinder 11 connected to the pressure chamber 7 via a capillary tube 10 at the center.

A concave portion 11a is formed in a longitudinal direction on one side of the outer periphery of the temperature sensing cylinder 11, and a rod-shaped heater 12 is attached to the adhesive 1 with respect to the concave portion 11a.
Glued by 3. Further, a thermostat 14 for temperature detection is adhered to the side of the thermosensitive cylinder 11 opposite to the heater 12 by an adhesive 13, and the heater 12 and the thermostat 14 are fixed by a series of holders 15.

A heat-insulating material layer 16 is provided on the outer periphery of the temperature-sensitive cylinder 11 provided with the heater 12 and the thermostat 14, and a heat-resistant synthetic resin sheet is provided.
At 17 and an aluminum foil 17 ′, it is covered with a heat-resistant tape 18 and bound at both ends by a convergence band 19. 20 is a screw stop band for fixing the heat motor, 12a
Is a lead wire of the heater 12, and 14a is a lead wire of the thermostat 14.

In the above configuration, when used, the lead wire 12 of the heater 12 is used.
a and the lead wire 14a of the thermostat 14 are connected to a controller (not shown). When the condensing pressure is high, the valve body 2 is in the state shown in the drawing, and the refrigerant flows from the first inlet C to the outlet R
Flowing to As the condensing pressure decreases, the heater 12 generates heat in response to a signal from the controller, and the pressure in the pressure chamber 7 increases through the temperature-sensitive cylinder 11, so that the valve body 2 resists the spring 3 and the valve seat B ' And moves to the C 'side to operate to increase the condensation pressure by directing the high pressure directly to the outlet.

When abnormal heating by the heater 12 occurs, the current to the heater 12 is cut off by the thermostat 14, and at this time, the thermostat 14 is fixed to the thermosensitive cylinder 11 on the side opposite to the mounting portion of the heater 12, Heating heater 12
Thermostat without being directly affected by heat
14 can operate by grasping the temperature of the temperature sensing tube itself.

In addition, since the whole of these is shielded from the outside by the heat insulating material layer 16, the influence of the ambient temperature at the place where the heat motor unit H is installed can be avoided. Can work.

Effect of the Invention As described above, the present invention is connected to the main body, the first inlet connected to the outlet side of the condenser, the second inlet connected to the high pressure side of the compressor, and the receiver side. An outlet, a pressure chamber, and a valve body that selectively opens and closes the first inlet and the second inlet in accordance with a change in pressure in the pressure chamber, and is disposed separately from the main body. At the same time, in a heat motor portion connected to the pressure chamber via a capillary tube, a position where a heater and a thermostat for shutting off current to the heater are opposed to each other with respect to the temperature-sensitive cylinder with the temperature-sensitive cylinder interposed therebetween. In addition, since the thermosensitive cylinder, the heater, and the thermostat are surrounded by a heat insulating material layer, abnormal heating by the heater is prevented to prevent deterioration of characteristics inside the thermosensitive cylinder. Can directly affect the heat from the heater The thermostat can operate by grasping the temperature of the temperature-sensitive cylinder itself because it is not affected, and can avoid the influence of the ambient temperature at the place where the heat motor is installed. Can be operated, and it is effective to keep the condensing pressure of the refrigeration cycle normal.

[Brief description of the drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, and FIG. 2 is a sectional view taken along line II-II of FIG. V: condensing pressure regulating valve, H: heat motor section, C:
1st inlet, B ... 2nd inlet, R ... outlet, 2 ... valve body,
7 ... pressure chamber, 11 ... temperature-sensitive cylinder, 12 ... heater, 14 ... thermostat.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Minoru Sanbe 1-6, Uchisaiwaicho, Chiyoda-ku, Tokyo Nippon Telegraph and Telephone Corporation (72) Kazuo Oshima 1-16-1 Uchisaiwaicho, Chiyoda-ku, Tokyo Japan Within Telegraph and Telephone Co., Ltd. (72) Inventor Shinichiro Yamada 390 Muramatsu, Shimizu-shi, Shizuoka Prefecture Inside Shimizu Plant of Hitachi, Ltd. (72) Inventor Norimasa Kimura 2-55-5 Wakamiya Nakano-ku, Tokyo Inside Sagimiya Manufacturing Co., Ltd. (72) Inventor Tadaaki Ikeda 1-12-43 Koyata, Iruma-shi, Saitama Pref. ) JitsuHiraku Akira 63-87378 (JP, U) JitsuHiraku Akira 56-90675 (JP, U) JitsuHiraku Akira 58-25872 (JP, U) JitsuHiraku Akira 56-141266 (JP, U)

Claims (1)

(57) [Claims] A first body connected to an outlet side of a condenser.
An inlet, a second inlet connected to the high-pressure side of the compressor, an outlet connected to the receiver, a pressure chamber, and the first inlet and the second inlet according to a pressure change in the pressure chamber. A valve body that selectively opens and closes, and is disposed separately from the main body, and is connected to the pressure chamber via a capillary tube. ,
A heater and a thermostat for shutting off current to the heater are provided at positions facing each other with the temperature-sensitive cylinder interposed therebetween,
A heat motor-type condensing pressure regulating valve, wherein the temperature-sensitive cylinder, the heater, and the thermostat are surrounded by a heat insulating material layer.