JPH11211285A - Open-close valve and refrigerator using open/close valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a highly reliable open/close valve and a refrigerator using this open/close valve by enhancing the durability of a valve element of the open/close valve used in a refrigerating circuit of a refrigerator. SOLUTION: An open/close valve 10 includes an open/close valve body 14, a valve seat 13 disposed in a refrigerating circuit 14a of the open/close valve body 14 and having an opening 13a through which refrigerant passes, and a valve element 12 which is disposed in the refrigerating passage 14a of the open/ close valve body 14 and in the vicinity of the valve seat 13 which opens or closes the opening 13a. The valve element 12 is made of a material containing at least one kind of a synthetic resin selected from the group of various kinds of synthetic resins having high heat resistance and low water absorbing property as a main component. The open/close valve 10 is disposed in a refrigerator provided with a refrigerant circuit in which a hydrofluorocarbon is used as a refrigerant and an ester oil or ether oil are used as a refrigerating machine oil.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an on-off valve for controlling the flow rate of a refrigerant in a refrigeration system using a refrigerant such as chlorofluorocarbon.

[0002]

2. Description of the Related Art An on-off valve as shown in FIG. The on-off valve 30 shown in the figure is a valve seat having a tubular on-off valve main body 14 having a refrigerant flow path 14a, and an opening 13a provided in the refrigerant flow path 14a of the on-off valve main body 14 and through which refrigerant or the like flows. 13, a valve element 31 disposed near the valve seat 13 for opening and closing the opening 13a, an inlet pipe 15 connected to the refrigerant inlet side of the on-off valve main body 14, and connected to a refrigerant outlet side of the on-off valve main body 14. And the outlet pipe 11 formed.

When the on-off valve 30 is used in a refrigerant circuit of a refrigerating device such as an air conditioner or a refrigerating machine, when the refrigerant or the refrigerating machine oil flows into the refrigerant channel 14a from the inlet pipe 15, the pressure of the refrigerant or the refrigerating machine oil is reduced. As a result, the valve element 31 floats from the valve seat 13, and a gap is generated between the valve element 31 and the valve seat 13. Then, the refrigerant and the refrigerating machine oil pass through the gap and flow out of the outlet pipe 11. On the other hand, when the refrigerant or the refrigerating machine oil does not flow into the inlet pipe 15, the valve body 31 is seated on the valve seat 13 by its own weight or the spring force, and seals the opening 13a of the valve seat 13. As described above, the on-off valve 30 functions to prevent the refrigerant and the refrigerating machine oil from flowing backward from the outlet pipe 11 toward the inlet pipe 15.

The conventional valve element 31 is made of polyamide 66.
It is molded as a material. It is desirable that the valve element 31 can firmly seal the opening 13a of the valve seat 13 when the valve is closed. For this reason, the contact surface of the valve element 31 with the valve seat 13 is formed by cutting to have a surface roughness (Rmax) of 3 μm.
It is processed with high accuracy with the following goals.

[0005]

The conventional on-off valve 30 is arranged, for example, on a pipe on the compressor discharge side in a refrigerant circuit. In that case, the inside of the on-off valve 30 is 100 to
May be exposed to refrigerant at 130 ° C or refrigeration oil. If the inside of the on-off valve 30 is exposed to such a high temperature for a long period of time, the polyamide 66 constituting the valve element 31 may be reduced in strength due to thermal deterioration, and the valve element 31 may be deformed or damaged. Thereby, the valve element 3 when seated on the valve seat 13
In some cases, the sealability between the valve 1 and the valve seat 13 is lost, and the refrigerant or the refrigerating machine oil flows backward from the outlet pipe 11 to the inlet pipe 15.

The polyamide 66 forming the valve element 31
Has a high water absorption, especially 10
When exposed to a high temperature of 0 to 130 [deg.] C., hydrolysis is promoted and strength is reduced. As a result, the valve element 3
There is a possibility that the sealing property of 1 may be impaired. When using hydrofluorocarbon as the refrigerant of the refrigeration system,
As the refrigerating machine oil, a refrigerating machine oil having high water absorption such as ester oil or ether oil having high compatibility with hydrofluorocarbon is often used. In such a case, when ester oil or ether oil circulates through the refrigerant circuit in a state where the moisture concentration in the oil is high, the polyamide 66 constituting the valve element 31 absorbs moisture from the refrigerating machine oil at the time of contact with the refrigerating machine oil, Hydrolysis of the polyamide 66 is promoted, and the strength is reduced. Therefore, the sealing performance of the valve element 31 may be impaired as described above.

The present invention has been made in view of the above-described problems, and has as its object to increase the durability of a valve element of an on-off valve used in a refrigerant circuit of a refrigeration apparatus. An object is to provide a highly reliable on-off valve.

In addition to increasing the durability of the valve,
High reliability is achieved by improving the cutting workability of the valve body, reducing the amount of sodium chloride eluted from the valve body, improving the impact resistance, and reducing the dimensional change of the valve body due to water absorption. To provide a high-performance on-off valve.

It is a further object of the present invention to provide a refrigeration system using a hydrofluorocarbon as a refrigerant and an ester oil or an ether oil as a refrigerating machine oil, which is highly reliable.

[0010]

To achieve the above object, an on-off valve according to a first aspect of the present invention comprises an on-off valve main body having a refrigerant flow path and a refrigerant disposed in a refrigerant flow path of the on-off valve main body. A valve seat having a flowable opening, and a valve body that is disposed near the valve seat in the refrigerant flow path of the on-off valve body and opens and closes the opening, wherein the valve body has durability. Polyphenylene sulfide, chlorinated polyether, allyl resin, epoxy resin, liquid crystal resin, aromatic polyamide, polyamide imide, polyarylate, polyallyl sulfone, polybenzimidazole, poly Ether ether ketone, polyether imide, polyether ketone, polyether nitrile, polyether sulfone, polythioether sulfone, polyimide, polyether Amino bismaleimide, selected from the group consisting polyketone, polysulfone, and is formed of a material mainly containing at least one synthetic resin.

Further, in the opening / closing valve according to the second invention, the material forming the valve body in the first invention includes a powdery filler having a particle diameter of 2 μm or less.

The on-off valve according to the third aspect of the present invention is the
According to the invention, the material forming the valve body includes a fibrous filler having a diameter of 2 μm or less.

Further, in the opening / closing valve according to the fourth invention, the material forming the valve body in the first invention contains a filler having a Moh's hardness of 4 or less.

Further, the on-off valve according to the fifth invention comprises
In the fourth invention, the material forming the valve body contains polyphenylene sulfide having a chlorine concentration of 200 ppm or less.

The on-off valve according to a sixth aspect of the present invention is the
In the fifth to fifth aspects, the material forming the valve body includes linear polyphenylene sulfide.

Further, the on-off valve according to the seventh aspect of the present invention comprises
In the fourth invention, the filler contained in the material forming the valve body has been surface-treated with a silane coupling agent.

Further, the refrigeration apparatus according to the eighth invention is provided with a refrigerant circuit in which hydrofluorocarbon is used as a refrigerant and ester oil or ether oil is used as a refrigeration oil. Item 7. The on-off valve according to any one of Items 7 to 7, wherein the on-off valve is provided in a refrigerant circuit.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 of the Invention FIG. 1 is an end view of the on-off valve according to the first embodiment, and FIG. 2 is a refrigerant circuit diagram of a refrigeration apparatus in which the on-off valve according to the first embodiment is disposed in a refrigerant circuit. 1 and 2, reference numeral 10 denotes an on-off valve according to the first embodiment, which includes a compressor 3, a condenser 2, an expansion valve 1, and an evaporator 4.
Circuit 40 of the refrigeration system, which is connected through a pipe 5
(FIG. 2) deployed and used.

As shown in FIG. 1, the on-off valve 10 has an inlet pipe 15, an on-off valve main body 14, a valve seat 13, and an outlet pipe 11 having the same structure as those of the prior art. Is configured. When the on-off valve 10 is used in a refrigerant circuit of a refrigeration apparatus, when refrigerant or refrigerating machine oil flows into the inlet pipe 15 of the on-off valve 10, the valve body 12 floats from the valve seat 13 due to the pressure of the refrigerant or refrigerating machine oil, and the valve body 12 and valve seat 13
There is a gap between them. Then, the refrigerant and the refrigerating machine oil pass through the gap and flow out of the outlet pipe 11. On the other hand, when no refrigerant or refrigerating machine oil flows into the inlet pipe 15, the valve body 12 is seated on the valve seat 13, and the opening 13a of the valve seat 13 is sealed. Thus, the on-off valve 10 has a function of preventing the refrigerant and the refrigerating machine oil from flowing backward from the outlet pipe 11 to the inlet pipe 15.

In particular, the valve element 12 has excellent heat resistance,
Further, it is molded using polyphenylene sulfide having a small water absorption as a main material, and further filled with a fibrous reinforcing material having a diameter of 2 μm or less (an example of a fibrous filler). Also, the opening 13a of the valve seat 13 when the valve is closed.
The valve seat 13 of the valve body 12 is
Surface roughness (Rmax) 3μ by cutting
m or less with high precision.

Here, the relationship between the durability of the valve body and the synthetic resin material constituting the valve body will be described. When the on-off valve is provided in the pipe on the compressor discharge side in the refrigerant circuit, the temperature becomes 10
The inside of the on-off valve may be exposed to a refrigerant at 0 to 130 ° C. or refrigeration oil. Therefore, it is necessary that the valve element be made of a material that can maintain strength even when exposed to such a high temperature for a long time. Further, when the synthetic resin material constituting the valve body is exposed to a high temperature of 100 to 130 ° C. in a state of a high water content, hydrolysis may be promoted and strength may be reduced. It is necessary to compose a valve body.

Table 1 below shows the continuous usable temperature and water absorption of various synthetic resin materials. As is clear from Table 1, polyphenylene sulfide, chlorinated polyether,
Allyl resin, epoxy resin, liquid crystal resin, aromatic polyamide, polyamideimide, polyarylate, polyallylsulfone, polybenzimidazole, polyetheretherketone, polyetherimide, polyetherketone, polyethernitrile, polyethersulfone, poly Synthetic resins presented as thioethersulfone, polyimide, polyaminobismaleimide, polyketone, and polysulfone are materials with higher heat resistance and significantly lower water absorption than polyamide 66 used in conventional on-off valves. . Therefore, by configuring the valve body of the on-off valve with these materials, an on-off valve having excellent durability can be obtained. These materials may be used alone, but the same effect can be obtained by mixing and using a plurality of types. Further, other materials may be mixed with these materials. For example, it is needless to say that similar results can be obtained with a material obtained by mixing a polyphenylene sulfide with a fluorine resin, a nylon resin, a polyphenylene ether, a norbornene-based resin, or the like. .

[0023]

[Table 1]

The synthetic resin materials shown in Table 1 are used in order to improve the moldability and to improve the strength and heat resistance of the molded product obtained by molding. It is often used after filling. However,
When configuring the valve body of the on-off valve with these synthetic resin materials filled with filler, depending on the type of filler, the surface roughness of the contact surface with the valve seat in the cut valve body,
Alternatively, the amount of wear of the cutting tool during cutting of the valve body may be excessive.

Table 2 below shows the surface roughness of the cut surface when a molded plate molded using polyphenylene sulfide filled with various fillers was cut with a diamond tool, and the wear of the diamond tool used for cutting. Indicate the amount. As is clear from Table 2, by filling a powdery or granular filler (eg, beads) having a particle diameter of 2 μm or less or a fibrous reinforcing material (eg, whiskers) having a diameter of 2 μm or less, the An increase in surface roughness (Rmax) due to falling off or breakage of the filler can be suppressed to 3 μm or less. In addition, even if it mixes and fills the powder-like filler whose particle diameter is 2 μm or less and the fibrous reinforcing material whose diameter is 2 μm or less,
Of course, the same effect can be obtained. Further, when a filler having a Mohs hardness of 4 or less is filled, the filler can be easily cut even if the diameter of the filler is larger than 2 μm, so that the surface roughness (Rmax) of the cut surface becomes 3 μm or less, and Compared to a filler having a Mohs' hardness of 7, such as glass fiber, the wear amount of the diamond bite per 1000 m of cutting distance is small, and the cutting cost can be reduced.

[0026]

[Table 2]

Embodiment 2 of the Invention Next, another embodiment (Embodiment 2) of the on-off valve of the present invention will be described. FIG. 3 is an end view of the on-off valve according to the second embodiment,
The same or corresponding portions as those of the on-off valve 10 according to the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The on-off valve 20 according to the second embodiment is different from the on-off valve 10 according to the first embodiment in that the valve element 12 of the on-off valve 10 according to the first embodiment has a polyphenylene sulfide filled with a fibrous reinforcing material having a diameter of 2 μm or less. In contrast, the valve element 21 of the on-off valve 20 according to the second embodiment
Is that it is composed of a linear type polyphenylene sulfide having a chlorine concentration of 200 ppm or less, and is filled with a fibrous reinforcing material having a diameter of 2 μm or less surface-treated with vinylsilane.

In general, chlorine contained in the synthetic resin material forming the valve element 21 elutes during long-term contact with the refrigerant or the refrigerating machine oil in the refrigerant circuit to generate free chlorine in the refrigerant circuit, and thus hydrochloric acid. Is known to promote the deterioration of refrigerating machine oil. Incidentally, about 1000 ppm of chlorine remains in general polyphenylene sulfide, but it is possible to reduce the chlorine concentration to 200 ppm or less by purifying polyphenylene sulfide. Therefore, by using the polyphenylene sulfide purified to have a chlorine concentration of 200 ppm or less to form the valve element 21 of the second embodiment, the on-off valve 20 having low harm to refrigerating machine oil can be obtained.

In general, polyphenylene sulfide is roughly classified into a crosslinked type and a nilia type, and it is known that a linear type polyphenylene sulfide is superior in impact resistance to a crosslinked type polyphenylene sulfide. Therefore, in the on-off valve 20 according to the second embodiment, the valve body 21 is formed of nilia-type polyphenylene sulfide,
The durability against an impact force generated when the valve body 21 collides with the valve seat 13 when the valve is closed is improved, and the durability of the on-off valve 20 is further improved.

In the on-off valve 20 of the second embodiment,
The linear type polyphenylene sulfide mainly constituting the valve element 21 is filled with a fibrous reinforcing material, and the fibrous reinforcing material has been surface-treated in advance with vinylsilane which is a kind of a silane coupling agent. That is, the adhesion between the fibrous reinforcement and the polyphenylene sulfide is enhanced by the vinyl silane present at the interface between the fibrous reinforcement and the polyphenylene sulfide. Therefore, the second embodiment
Opening / closing valve 20 is provided with a valve body 21 by absorbing moisture in the refrigerant circuit.
Dimensional change is small, and valve performance is improved.

Table 3 below shows that the surface of a potassium titanate whisker, which is a kind of fibrous reinforcing material, is surface-treated with various silane coupling agents, and is filled with polyphenylene sulfide. The result of having examined the dimensional change rate is shown. As is apparent from Table 3, with respect to polyphenylene sulfide, the surface treatment of the filler, particularly with vinylsilane or phenylsilane,
The dimensional change due to water absorption of the polyphenylene sulfide containing the filler can be reduced.

[0033]

[Table 3]

Embodiment 3 of the Invention Next, another embodiment (Embodiment 3) of the present invention will be described. FIG. 2 is a refrigerant circuit diagram of a refrigeration apparatus according to the third embodiment. The refrigerating apparatus shown in the figure has a refrigerant circuit 40 that uses hydrofluorocarbon as a refrigerant and uses ester oil or ether oil as a refrigerating machine oil. The on-off valve 10 of the first embodiment or the on-off valve 20 of the second embodiment is provided in the refrigerant circuit 40. Other components are the same as those of the refrigeration apparatus of the first or second embodiment,
Description is omitted.

As described in the first embodiment, the on-off valve 10 is more durable against moisture in the refrigerant than the on-off valve 30 of the related art. Even in a refrigerating device using ester oil or ether oil, that is, a refrigerating device in which the water in the refrigerant circuit 40 is absorbed by the highly water-absorbing ester oil or ether oil and the oil concentration in the oil is high, the reliability of the on-off valve is also high. The refrigerating apparatus which maintains its reliability and has excellent reliability can be obtained.

As described in the second embodiment, the on-off valve 20 is also superior in durability and valve performance to moisture in the refrigerant as compared with the conventional on-off valve 30. In a refrigeration system in which water is absorbed by highly water-absorbing ester oil or ether oil and the water concentration in the oil is high, the reliability and valve performance of the on-off valve are maintained at a certain level or more, and the reliability and performance are excellent. A refrigeration device can be obtained.

[0037]

EXAMPLES The present invention will be described in more detail with reference to examples and comparative examples. Embodiment 1 FIG. The valve element 12 according to Example 1 is different from the valve 10 of Embodiment 1 shown in FIG. 1 in that polyphenylene sulfide is used as a main material, and potassium titanate whiskers having a diameter of 1 μm are added to the entire material.
It is formed by filling 0 wt%. The contact surface of the valve body 12 with the valve seat 13 is cut with a diamond bite. Here, the surface roughness of the cut surface of the valve body 12 is measured by a surface roughness meter, and the leakage characteristics of the manufactured on-off valve 10 are determined by applying nitrogen gas to the outlet pipe 11 at a pressure of 1.5 MPa, The evaluation was performed by measuring the amount of nitrogen gas flowing out of Sample No. 15. The on-off valve 10 was manufactured at 180 ° C.
Was stored in a thermostat for 150 hours, and the leakage characteristics after storage were examined to evaluate the durability. The results are shown in Table 4 below.
According to Example 1 in the table, the required surface roughness (Rmax) of the cut surface of the valve body 12 is 3 μm or less, and the initial leakage characteristic of the on-off valve 10 is as good as 10 cc / min or less. Thus, the on-off valve 10 with high durability was obtained without deterioration of the leak characteristics due to the heat resistance test.

Here, potassium titanate whisker was used as a fibrous reinforcing material having a diameter of 2 μm or less, but aluminum borate whisker, silicon nitride whisker, basic magnesium sulfate whisker, graphite whisker, calcium sulfate whisker Whiskers, magnesium borate whiskers, chrysotile whiskers, wollastonite whiskers, silicon carbide whiskers, α-alumina whiskers, and fine glass fibers may be used.

Embodiment 2 FIG. Valve element 12 according to the second embodiment
As shown in FIG. 1, polyphenylene sulfide is used as a main material like the on-off valve 10 of the first embodiment shown in FIG. It is formed by filling 50 wt% of the whole. Using this valve body 12, an on-off valve 10 was produced and evaluated in the same manner as in Example 1. The evaluation results are shown in Table 4 below. Also in the second embodiment, the surface roughness (Rmax) of 3 μm or less required for the cut surface of the valve body 12 is obtained,
The initial leakage characteristics of the on-off valve 10 were as good as 10 cc / min or less, and the on-off valve 10 with high durability was obtained without deterioration of the leakage characteristics due to the heat resistance test.

Embodiment 3 FIG. Valve element 21 according to the third embodiment
As shown in FIG. 3, a linear type polyphenylene sulfide having a chlorine concentration of 100 ppm is used as a main material as in the on-off valve 20 of the second embodiment shown in FIG. 3, and in addition, a diameter of 5 μm, a Mohs hardness of 4, and vinyl silane are used. 60% by weight of zinc oxide whiskers previously treated
It is formed by filling. Using this valve element 21, an on-off valve 20 was produced and evaluated in the same manner as in Example 1. The evaluation results are shown in Table 4 below. Also in the third embodiment, the surface roughness (Rma) of 3 μm or less necessary for the cut surface of the valve body 21 is used.
x) is obtained, and the initial leakage characteristic of the on-off valve 20 is 10 cc.
/ Min or less, and the on-off valve 20 with high durability was obtained without deterioration of the leakage characteristics due to the heat resistance test.

Comparative Example 1 As a comparative example, the valve element 31 of the conventional on-off valve 30 shown in FIG. 4 is mainly made of polyphenylene sulfide, and in addition, glass beads having a particle size of about 20 μm are combined with 40 wt% of the entire material.
It is formed by filling. Using this valve element 31, an on-off valve 30 was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Table 4 below. In the case of Comparative Example 1, the valve 3
Surface roughness (Rmax) of 3 μm or less required for 1 cut surface
And the leakage characteristic of the on-off valve 30 is 200 c
It exceeds c / min and is inferior in valve performance.

Comparative Example 2 As another comparative example, the valve element 31 in the conventional on-off valve 30 shown in FIG.
Is used as the main material, with a diameter of 14μ
m glass fiber is filled at 40 wt% of the whole material. Using this valve element 31, an on-off valve 30 was prepared and evaluated in the same manner as in Example 1. The evaluation results are shown in Table 4 below.
Shown in This comparative example 2 also requires 3
μm or less of surface roughness (Rmax) was not obtained.
The leak characteristic of 0 also exceeds 200 cc / min, and the valve performance is inferior.

Comparative Example 3 As another comparative example, in the conventional on-off valve 30 shown in FIG. 4, the valve element 31 is configured by using a polyamide 66 not filled with a filler as a material, and the on-off valve 30 is manufactured in the same manner as in Example 1. evaluated. The evaluation results are shown in Table 4 below. According to this comparative example 3, the surface roughness (Rma) of 3 μm or less required for the cut surface of the valve body 31
x) is obtained, and the initial leakage characteristic of the on-off valve 30 is also 1
The result was as good as 0 cc / min or less. However, the leakage characteristics after the heat resistance test exceeded 1000 cc / min, and were extremely poor in durability.

[0044]

[Table 4]

[0045]

As described above, according to the first aspect, polyphenylene sulfide, chlorinated polyether,
Allyl resin, epoxy resin, liquid crystal resin, aromatic polyamide, polyamideimide, polyarylate, polyallylsulfone, polybenzimidazole, polyetheretherketone, polyetherimide, polyetherketone, polyethernitrile, polyethersulfone, poly A material mainly composed of a synthetic resin with excellent heat resistance such as thioether sulfone, polyimide, polyamino bismaleimide, polyketone, and polysulfone, and a small water absorption.
Since the valve body is formed, it has high durability even when used in an atmosphere where moisture exists at high temperature and is susceptible to hydrolysis,
An on-off valve can be provided.

In the on-off valve according to the second invention, the first valve
Since the material forming the valve body of the invention of the invention contains a powdery or granular filler having a particle size of 2 μm or less, the surface roughness (Rmax) of the cut surface at the time of cutting the valve body becomes 3 μm or less, and The leakage amount is reduced, and the reliability of the on-off valve is improved.

In the opening / closing valve according to the third aspect of the present invention, since the material forming the valve body of the first aspect of the present invention includes a fibrous filler having a diameter of 2 μm or less, the cutting at the time of cutting the valve body is performed. The surface roughness (Rmax) of the surface becomes 3 μm or less, the leakage amount of the on-off valve is reduced, and the reliability of the on-off valve is improved.

Further, in the on-off valve according to the fourth invention, the first valve
Since the material forming the valve body of the invention of the invention contains a filler having a Mohs hardness of 4 or less, the surface roughness (Rmax) of the cut surface at the time of cutting the valve body becomes 3 μm or less, and the amount of leakage of the on-off valve is reduced. And the reliability of the on-off valve is improved. In addition to it,
The wear of the cutting tool is reduced, and the processing cost of the on-off valve is reduced.

Further, according to the on-off valve according to the fifth invention,
The material forming the valve body according to the first to fourth inventions has a chlorine concentration of 2%.
Since it contains polyphenylene sulfide of not more than 00 ppm, the concentration of sodium chloride eluted from the valve body is reduced, and the harmfulness of the on-off valve to refrigeration oil is reduced.

In the opening / closing valve according to the sixth invention, the material forming the valve body of the first to fifth inventions includes linear polyphenylene sulfide, so that the valve body has improved impact resistance. The reliability of the on-off valve is improved.

Further, in the on-off valve according to the seventh invention, the second valve
Since the filler contained in the material forming the valve body according to the fourth aspect of the present invention is surface-treated with a silane coupling agent, the dimensional change of the valve body due to moisture absorption in the refrigerant circuit is reduced, and the valve of the on-off valve is reduced. Performance is improved.

According to the eighth aspect of the present invention, there is provided a refrigerating apparatus using hydrofluorocarbon as a refrigerant and ester oil or ether oil as a refrigerating machine oil.
Since the on-off valve according to the seventh to seventh aspects of the present invention is provided, the reliability of the on-off valve is high even when the refrigerating machine oil is used in a high-temperature atmosphere with a high moisture concentration, and thus the reliability of the refrigerating apparatus is improved.

[Brief description of the drawings]

FIG. 1 is an end view showing an on-off valve according to Embodiment 1 of the present invention.

FIG. 2 is a refrigerant circuit diagram showing a refrigeration apparatus according to Embodiments 1 to 3 of the present invention.

FIG. 3 is an end view showing an on-off valve according to a second embodiment of the present invention.

FIG. 4 is an end view of a conventional on-off valve.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 10 On-off valve, 12 valve body, 13 valve seat, 13a opening, 14 on-off valve main body, 14a refrigerant flow path, 20 on-off valve, 21 valve body, 40 refrigerant circuit.

Claims (8)

[Claims] An on-off valve main body having a refrigerant flow path, a valve seat provided in the refrigerant flow path of the on-off valve main body and having an opening through which a refrigerant can flow, and A valve element disposed near the valve seat to open and close the opening, wherein the valve element is made of polyphenylene sulfide, chlorinated polyether, allyl resin, epoxy resin, liquid crystal resin, aromatic polyamide. , Polyamideimide, Polyarylate, Polyallylsulfone, Polybenzimidazole, Polyetheretherketone, Polyetherimide, Polyetherketone, Polyethernitrile, Polyethersulfone, Polythioethersulfone, Polyimide, Polyaminobismaleimide, Polyketone, Polysulfone At least one synthetic resin selected from the group consisting of An on-off valve characterized by being formed of the following material. 2. The on-off valve according to claim 1, wherein the material forming the valve body includes a particulate filler having a particle diameter of 2 μm or less. 3. The on-off valve according to claim 1, wherein the material forming the valve body includes a fibrous filler having a diameter of 2 μm or less. 4. The on-off valve according to claim 1, wherein the material forming the valve body includes a filler having a Moh's hardness of 4 or less. 5. The material forming the valve body has a chlorine concentration of 20.
The on-off valve according to any one of claims 1 to 4, further comprising 0 ppm or less of polyphenylene sulfide. 6. The on-off valve according to claim 1, wherein the material forming the valve body includes linear polyphenylene sulfide. 7. The on-off valve according to claim 2, wherein the filler contained in the material forming the valve body is surface-treated with a silane coupling agent. . 8. A refrigerating apparatus comprising a refrigerant circuit in which hydrofluorocarbon is used as a refrigerant and an ester oil or an ether oil is used as a refrigerating machine oil. A refrigeration apparatus characterized in that the on-off valve according to (1) is provided in the refrigerant circuit.