JP2701945B2 - Temperature type subcool control valve - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a refrigerant flow control valve in a heat pump cycle by supercooling control.

[Conventional technology]

In a conventional heat pump cycle using a temperature-type expansion valve, two expansion valves are used during a cooling operation and a heating operation. However, in a heat pump cycle using a supercooling control method, refrigeration-Vol. As shown in FIG. 1 on page 71, one thermal type subcool control valve was sufficient.

[Problems to be solved by the invention]

However, in this case, since the outflow and inflow of the liquid refrigerant to the subcool control valve are fixed, it is necessary to control the outflow and inflow of the liquid refrigerant to and from the subcool control valve through the manifold check valve. It is long and complicated, requires an extra refrigerant for charging the refrigerant, and requires a lot of maintenance.

Further, since the structure of the manifold check valve is complicated, a failure occurrence rate is high, and an error may occur depending on piping conditions.

As described above, in the heat pump cycle based on the supercooling control method, a manifold check valve having a complicated structure is required, and the circuit itself is complicated due to the need. Therefore, the cost and the failure rate of the entire system are high, and the expensive system is expensive. However, it was a low value-added system.

[Means for solving the problem]

According to the present invention, a valve having a through hole communicating with an indoor heat exchanger on one side and an outdoor heat exchanger on the other side is provided according to the present invention. The main bodies are provided to face each other, a cylindrical receiver having a partition wall having an opening inside is fixed to both valve bodies, and a diaphragm is interposed between the two receivers to tightly fix the two receivers. A stopper is provided inside the diaphragm so as to sandwich the diaphragm therebetween, and pistons each having a diameter substantially equal to the effective diameter of the diaphragm are provided facing each other so as to slide in the two valve bodies. A spring is interposed between each piston and each piston, a stem is implanted between each piston and both stoppers, and a bellows is provided between each partition and each piston of the both receivers so as to surround these stems. Each storage A bellows chamber is formed between the pistons and a valve body is provided on a side of each piston facing the stem so as to face a valve seat provided on each valve body in a valve chamber formed by each piston and each valve body. Each valve body is always protruded, and each valve body is constantly deviated toward the piston side, and an adjusting spring which can be individually adjusted from the outside is provided in each valve body, and each of the through holes, each piston, the valve body, and a partition of the receiving member are formed. A pressure equalizing hole that communicates with each valve element, stem and piston is provided so as to communicate with the intermediate chamber, and a bleed port that communicates each through hole with each valve chamber is formed in the valve body. The gist is that the temperature sensing cylinders provided in contact with the bellows chambers are respectively connected to the respective bellows chambers via the capillary tubes, and the respective through holes are respectively connected to the respective valve chambers via the communication passages. is there.

[Operation] Since the present invention has the means as described above, when the liquid refrigerant is not supercooled during the heating operation, the liquid refrigerant passes from one through hole communicating with the indoor heat exchanger to one pressure equalizing hole. Then, the valve body is introduced into one of the intermediate chambers, moves one valve body via one piston against one adjustment spring pressure, and seats on one valve seat to close the valve.

At the same time, the high-pressure sealed gas in one temperature-sensitive cylinder provided in one through-hole is guided into one bellows chamber through a capillary tube, and the one stopper, the diaphragm and the other are caused by the high gas pressure in the bellows chamber. The other valve body is similarly closed via the other stem and the other piston.

However, the liquid refrigerant flows through one valve chamber and the other communication passage through the one bleed port to the other communication hole, and passes through one communication hole, one communication passage, the other valve chamber and the other bleed port to the other bleed port. Since the refrigerant flows through the through-hole, a smaller volume of liquid refrigerant than the normal control amount can be constantly flowed.

In contrast, when the liquid refrigerant is supercooled to a predetermined temperature,
Depending on the degree of supercooling, the pressure of the gas in one of the temperature-sensitive cylinders decreases, so the pressure in one of the bellows chambers decreases, and the other adjusts the spring pressure to open the other valve opposite to the above. The liquid refrigerant is supplied to the outdoor heat exchanger while maintaining the valve opening in accordance with the degree of supercooling.

During the cooling operation, the liquid refrigerant is introduced from the other through hole communicating with the outdoor heat exchanger to the other intermediate chamber through the other pressure equalizing hole, and the other valve body is connected to the other adjusting spring via the other piston. And seats on the other valve seat to close the valve.

At the same time, the high-pressure sealed gas in the other temperature-sensitive cylinder provided in the other through-hole is guided into the other bellows chamber via the capillary tube, and the other stopper, the diaphragm and one of the other are pressed by the high-pressure gas pressure in the bellows chamber. Similarly, one valve body is closed via the stopper, one stem, and one piston.

However, the refrigerant flows through the other bleed port through the other valve chamber and the one communication passage into one through hole, and flows through the other communication passage, one valve seat and one bleed port into one through hole. The liquid refrigerant having a smaller volume than the normal control amount can be continuously flowed.

In contrast, when the liquid refrigerant is supercooled to a predetermined temperature,
The pressure in the other bellows chamber decreases because the pressure of the sealed gas in the other temperature-sensitive cylinder decreases in accordance with the degree of subcooling, and one of the valve bodies opens in the opposite manner to the above due to the adjustment spring pressure of the other. The liquid refrigerant is supplied to the indoor heat exchanger while maintaining the valve opening in accordance with the degree of supercooling.

〔Example〕

Next, embodiments of the present invention will be described with reference to the drawings. In FIG. 1, 101 is a compressor, 102 is a four-way valve for switching the flow direction of the refrigerant, 103 is an accumulator, 104 is an indoor heat exchanger, and 105 is an outdoor heat exchanger. 106 is a suction pipe and 107 is a discharge pipe. During the cooling operation, the refrigerant flows in the direction shown by the broken line in FIG.
The subcool control valve 100 senses at 4a and adjusts the flow rate of the liquid refrigerant flowing into the indoor heat exchanger 104.

During the heating operation, the refrigerant flows in the direction indicated by the solid line, and the subcool control valve 1 controls the flow rate of the liquid refrigerant flowing into the outdoor heat exchanger 105 when the supercooling at the outlet of the indoor heat exchanger 104 is detected by the temperature sensing tube 24b.
00 adjust.

Next, the details of the subcool control valve 100 will be described with reference to FIG. One of the valve bodies 1a has one through hole 2a communicating with the indoor heat exchanger 104, and the other valve body 1b facing the one valve body 1a communicates with the outdoor heat exchanger 105. It has the other through hole 2b.

Receptacles 3a and 3b are fixed to the valve bodies 1a and 1b by screws and the like, respectively, and sandwich the diaphragm 4 fixedly opposed to each other.

In each valve body, a piston 5a, 5b having a diameter substantially equal to the effective diameter of the diaphragm 4 is provided so as to slide. Stoppers 6a and 6b are provided on both sides of the diaphragm 4 so as to face each other, and both ends of stems 7a and 7b are fixed between the stoppers 6a and 6b and the pistons 5a and 5b, respectively.

The receivers 3a, 3b are provided with partitions 9a, 9b projecting inward from each other and having openings 8a, 8b at the center, respectively. Each stem 7 is located between the partition walls 9a, 9b and the pistons 5a, 5b.
Bellows 10a and 10b are provided so as to surround a and 7b, respectively.

Thus, the intermediate chambers 11a, 11b are formed between the pistons 5a, 5b and the partition walls 9a, 9b, respectively, and the bellows chambers 12a, 11b are formed between the partition walls 9a, 9b and the stoppers 6a, 6b, respectively. Form 12b.
Further, a spring 13a is provided between each partition 9a, 9b and each piston 5a, 5b.
13b is inserted. One end of each of the valve bodies 14a and 14b is fixed to each through hole side of each of the pistons 5a and 5b, and
Adjustment springs 17a, 17b are interposed between opposing spring receivers 16a, 16b, respectively, provided with 5a, 15b.

However, each spring receiver 16a, 16b is screwed with an externally adjustable adjusting screw 18a, 18b, respectively. These adjustment screws 18a, 1
The elasticity of the adjusting springs 17a and 17b can be adjusted by 8b.

The spring supports 15a, 15b, the valve bodies 14a, 14b, the stems 7a, 7b
And equalizing holes 19a, 19b are drilled in the pistons 5a, 5b, respectively.
Each through hole 2a, 2b communicates with each intermediate chamber 11a, 11b.

Reference numerals 20a and 20b denote valve chambers provided in the respective valve bodies 1a and 1b, and reference numerals 21a and 21b denote the respective through holes 2a and 2b and the valve chambers 20a and 20b.
The bleed port which communicates with is shown. 22a and 22b are valve seats, respectively.

Each of the through holes 2a, 2b and each of the valve chambers 20a, 20b are connected to a communication passage 23a,
It communicates via 23b.

Temperature-sensitive tubes 24a, 24b are provided in contact with the through holes 2a, 2b, respectively, and the capillary tubes 25a, 25b of the temperature-sensitive tubes are connected to the bellows chambers 12a, 12b, respectively.

Next, the operation of the control valve of the present invention will be described. First, during the heating operation, the indoor heat exchanger 104 becomes a condenser, and the outdoor heat exchanger 105 becomes an evaporator, and the refrigerant flows in the direction indicated by the solid line arrow. For this reason, the high-pressure liquid refrigerant passing through the through hole 2a is guided to the intermediate chamber 11a through the equalizing hole 19a, and rises the piston 5a in FIG. 2 against the elasticity of the adjusting spring 17a together with the elasticity of the spring 13a, Valve element 14
a is seated on the valve seat 22a and the valve is closed. At this time, when the liquid refrigerant flowing out of the indoor heat exchanger 104 is not supercooled, the sealed gas within the temperature sensitive 24a is at a high pressure, and the pressure in the bellows chamber 12a is increased via the capillary tube 25a. This pressure, together with the elasticity of the spring 13b,
b overcomes the pressure of the valve chamber 20b and the elasticity of the adjusting spring 17b, and the second
In the figure, the valve body 14b is lowered, and the valve body 14b is seated on the valve seat 22b to close the valve.

As described above, since the bleed ports 21a and 21b are provided even when the control valve 100 is in the closed state, the liquid refrigerant flowing through the through hole 2a receives the through hole 2a, the bleed port 21a, the valve chamber 20a, and the communication passage 23b. Through the through hole 2b, and on the other hand, the through hole 2a and the communication passage 23.
a, the refrigerant flows into the through-hole 2b via the valve chamber 20b and the bleed port 21b, so that the liquid refrigerant having a smaller volume than the control valve 100 normally controls can always flow.

On the other hand, when the liquid refrigerant flowing out of the indoor heat exchanger 104 is supercooled to a predetermined temperature, the pressure of the sealed gas in the thermosensitive cylinder 24a decreases according to the degree of supercooling, so that the pressure in the valve chamber 20b is reduced. The piston 5b rises in FIG. 2 due to the spring force of the adjusting spring 17b, so that the valve element 14b separates from the valve seat 22b and opens. At this time, as described above, the piston 5a is raised by the high-pressure liquid refrigerant guided to the intermediate chamber 11a from the pressure equalizing hole 19a, so that the valve body 14a is closed.

In this way, the valve element 14b maintains the valve opening in accordance with the degree of subcooling, while passing the liquid refrigerant through the communication hole 23a and the communication passage 23a.
Supply to the outdoor heat exchanger from b.

Next, when the four-way valve 102 is switched to the cooling operation, the outdoor heat exchanger 105 becomes a condenser and the indoor heat exchanger 104 becomes an evaporator, so that the liquid refrigerant flows as indicated by a dotted arrow, and the subcool control is performed through the through hole 2b. Flow into valve 100. The high-pressure liquid refrigerant flowing from the through hole 2b flows into the intermediate chamber 11b through the pressure equalizing hole 19b, so that the intermediate chamber 11b becomes high pressure and the adjusting spring together with the elasticity of the spring 13b.
The piston 5b is lowered in FIG. 2 against the elasticity of 17b, and the valve body 14b is closed with the valve seat 22b seated. At this time,
In a state where the liquid refrigerant flowing from the outdoor heat exchanger 105 is not supercooled, the gas pressure in the thermosensitive cylinder 24b is high, and the bellows chamber 12b is connected via the capillary tube 25b.
The piston 5a overcomes the pressure of the valve chamber 20a and the elasticity of the adjusting spring 17a, and rises in FIG. 2 to move the valve body 14a to the valve seat 22a. And close the valve.

As described above, since the bleed ports 21a and 21b are provided even when the control valve 100 is in the closed state, the liquid refrigerant flowing through the through hole 2b receives the through hole 2b, the bleed port 21b, the valve chamber 20b, and the communication passage 23a. Through the through hole 2a, and on the other hand, the through hole 2b and the communication passage 23.
b, through the valve chamber 20a and the bleed port 21a, flows into the through-hole 2a, and can constantly flow the liquid refrigerant having a smaller volume than the control valve 100 normally controls.

On the other hand, when the liquid refrigerant flowing out of the outdoor heat exchanger 105 is supercooled to a predetermined temperature, the pressure of the gas sealed in the temperature-sensitive cylinder 24b decreases according to the degree of supercooling, so that the pressure in the valve chamber 20a is reduced. The piston 5a is lowered in FIG. 2 due to the elasticity of the adjusting spring 17a and the valve body 14a is separated from the valve seat 22a and opened.

At this time, since the piston 5b is lowered by the high-pressure liquid refrigerant guided to the intermediate chamber 11b from the pressure equalizing hole 19b, the valve body 14b is closed.

In this way, the valve element 14a maintains the valve opening in accordance with the degree of subcooling, while passing the liquid refrigerant through the communication hole 23b and the communication passage 23b.
More to the indoor heat exchanger.

〔The invention's effect〕

As described above, according to the present invention, the respective valves opposing each other across the diaphragm operate properly according to the forward and reverse directions of the flow direction of the liquid refrigerant, so that the subcool control valve can be operated regardless of the operation mode. Since the inlet and outlet are only reversed, accessories such as a manifold check valve and complicated piping are not necessary, which is economically advantageous.In addition, since the parts are configured completely symmetrically with one diaphragm in between, It is easy to manage parts and intermediate assemblies in the factory, and because it is a reversible valve, there is no need to consider the direction of the inlet and outlet of the subcool control valve even when installing piping. By using the metal bellows, it is possible to have two diaphragm chambers having excellent airtightness.

Since the effective diameter of the diaphragm and the diameter of the piston are substantially the same, the high-pressure liquid refrigerant pressure substantially corresponds to the gas pressure in the temperature-sensitive cylinder, thereby realizing appropriate supercooling control.

By drilling equalizing holes in the valve, stem, and piston, high-pressure liquid refrigerant is guided to the intermediate chamber, and the unused valve can be completely closed, so that the other valve accurately realizes supercooling control. .

By providing a spring in the intermediate chamber, the valve closing operation of the unused valve is smoothly and quickly performed at the time of switching between the cooling and the heating.

Since the bleed port is provided in the main body, the suction pressure and the discharge pressure can be balanced immediately after the operation of the compressor is stopped. Also, even if the compressor is operated in a valve closed state due to insufficient cooling, the oil returns to the compressor through the bleed port, so that there is no trouble due to seizure of the compressor.

Since the adjusting screw is projected outside, the supercooling amount can be easily adjusted without stopping the operation while observing the operation state of the heat pump. Further, the control valve of the present invention has many advantages such as being compact and economical.

[Brief description of the drawings]

FIG. 1 is a circuit diagram when the subcool control valve of the present invention is used, and FIG. 2 is a detailed sectional view of the subcool control valve of one embodiment of the present invention. 1a, 1b: Valve body, 2a, 2b: Through hole, 3a, 3b: Receiver, 4
…… Diaphragm, 5a, 5b …… Piston, 6a, 6b …… Stopper, 7a, 7b …… Stem, 9a, 9b …… Partition, 10a, 10b…
... Bellows, 11a, 11b ... Intermediate chamber, 12a, 12b ... Bellows chamber, 13a, 13b ... Spring, 14a, 14b ... Valve, 17a, 17b ...
Adjusting springs, 18a, 18b …… Adjusting screws, 19a, 19b …… Equalizing holes,
20a, 20b …… Valve room, 21a, 21b …… Bleed port, 22a, 22
b ... valve seat, 23a, 23b ... communication passage, 24a, 24b ... temperature-sensitive cylinder, 2
5a, 25b …… Capillary tube, 101 …… Compressor, 102
…… Four-way valve, 104 …… Indoor heat exchanger, 105 …… Outdoor heat exchanger.

Claims (1)

(57) [Claims] 1. A valve body having through holes communicating with an indoor heat exchanger on one side and an outdoor heat exchanger on the other side is provided opposite to each other, and both valve bodies have a partition wall having an opening inside. The cylindrical receiver provided is fixed, the diaphragm is interposed between the two receivers, and the two receivers are tightly fixed together.Furthermore, the stoppers are installed facing each other so as to sandwich the diaphragm between these two receivers. Pistons each having a diameter substantially equal to the effective diameter of the diaphragm are provided so as to face each other, a spring is interposed between the partition walls of the two receivers and each piston, and a stem is provided between each piston and both stoppers. Implanted, each bellows is provided between each partition and each piston of the two receivers so as to surround these stems, each receiver,
A bellows chamber is formed between the stoppers, and each of the pistons opposes a valve seat provided on each valve main body in a valve chamber formed by each piston and each valve main body on a side facing each stem of each piston. Protruding as described above, each valve body is always deviated toward the piston side, and an adjusting spring which can be individually adjusted from the outside is provided in each valve body, and each through hole and each piston, valve body,
A pressure equalizing hole that passes through each valve element, stem and piston is provided so as to communicate with the intermediate chamber formed by the receiving partition, and a bleed port that communicates each through hole with each valve chamber is formed in the valve body, A temperature type in which each of the temperature sensing cylinders provided in contact with each of the through holes communicates with each of the bellows chambers through a capillary tube, and each of the through holes communicates with each of the valve chambers through each of the communication passages. Subcool control valve.