JP5780872B2 - Temperature expansion valve - Google Patents

Description

  In the refrigeration cycle, the present invention senses the evaporating temperature by a temperature sensing cylinder disposed on the outlet side pipe of the evaporator, and introduces the internal pressure of the pressure receiving chamber that changes in accordance with the sensed temperature and the pressure equalizing chamber from the evaporator. The present invention relates to a temperature expansion valve that automatically adjusts the valve opening degree of a valve port through which an apparatus refrigerant flows, and controls the degree of superheat of a refrigeration cycle based on a differential pressure with respect to the evaporation pressure.

  Conventionally, it is common to charge (fill) an apparatus refrigerant flowing in a refrigeration cycle inside a temperature sensing tube, a capillary tube and a pressure receiving chamber (hereinafter also simply referred to as a temperature sensing tube) of a temperature expansion valve. However, various charging methods have been put into practical use for improving the low temperature characteristics. In particular, the one that has a characteristic that intersects with the saturated vapor pressure curve of the device refrigerant flowing through the refrigeration cycle is called a cross-charge method, increasing the superheat degree in the high temperature range and decreasing the superheat level in the low temperature range, It is employed to provide a feature that maintains a uniform degree of superheat within the entire temperature range (see Non-Patent Document 1).

  The difference between the actual superheat degree and the set superheat degree (target value) is the superheat degree deviation. If this superheat degree deviation is not constant, the efficiency of the system may deteriorate in the controlled evaporation temperature range. Moreover, a liquid back | bag may arise and a compressor may be damaged.

"6th Edition Refrigeration and Air Conditioning Handbook Volume II, Equipment", Japan Society of Refrigeration and Air Conditioning, March 31, 2006, pp. 94-98, 4 ・ 1.3 Temperature automatic expansion valve

  Non-Patent Document 1 discloses various charging methods for the temperature sensing cylinder. However, the characteristics of the refrigerant (or gas) or absorbent that charges the temperature sensing cylinder with respect to the apparatus refrigerant, the way of mixing, etc. If this is not devised, an appropriate temperature expansion valve cannot be obtained.

  The present invention is a temperature expansion valve used in an air conditioner, a refrigeration and a refrigeration apparatus using R410A as an apparatus refrigerant for a refrigeration cycle. The problem is to make the degree deviation constant. Moreover, even when the temperature of the main body of a temperature expansion valve falls compared with the temperature sensitive cylinder temperature, it makes it a subject to make a superheat degree deviation small.

The temperature expansion valve according to claim 1 is a temperature expansion valve used for an air conditioner, a refrigeration, and a refrigeration apparatus using R410A as an apparatus refrigerant for a refrigeration cycle, and a non-condensation is made between a refrigerant different from the apparatus refrigerant in a temperature sensing cylinder. The mixed gas cross-charge method is used to fill the gas, R125 is used as a refrigerant different from the apparatus refrigerant, nitrogen is used as the non-condensable gas, and the volume ratio of R125 and nitrogen is 80:20 in the superheated gas state. To 95: 5.

The temperature expansion valve according to claim 2 is a temperature expansion valve used in an air conditioner, a refrigeration, and a refrigeration apparatus using R410A as an apparatus refrigerant for a refrigeration cycle, and a non-condensation is made between a refrigerant different from the apparatus refrigerant in a temperature sensing cylinder. The mixed gas cross-charge method is used to fill the gas, R125 is used as a refrigerant different from the apparatus refrigerant, nitrogen is used as the non-condensable gas, and the volume ratio of R125 and nitrogen is 80:20 in the superheated gas state. To 95: 5, and an absorbent material is used in the temperature sensitive cylinder.

The temperature expansion valve according to claim 3 is a temperature expansion valve used in an air conditioner, a refrigeration, and a refrigeration apparatus using R410A as an apparatus refrigerant for a refrigeration cycle, and a non-condensed refrigerant and a refrigerant different from the apparatus refrigerant in a temperature sensing cylinder. The mixed gas cross-charge method is used to fill the gas, R125 is used as a refrigerant different from the apparatus refrigerant, nitrogen is used as the non-condensable gas, and the volume ratio of R125 and nitrogen is 80:20 in the superheated gas state. 95: 5, an absorbent material is used in the temperature-sensitive cylinder, and a material mainly composed of calcium silicate is used as the absorbent material.

The temperature expansion valve according to claim 4 is a temperature expansion valve used for an air conditioner, a refrigeration and a refrigeration apparatus using R410A as an apparatus refrigerant of a refrigeration cycle, and a temperature-sensitive cylinder is not condensed with a refrigerant different from the apparatus refrigerant. The mixed gas cross-charge method is used to fill the gas, R125 is used as a refrigerant different from the apparatus refrigerant, nitrogen is used as the non-condensable gas, and the volume ratio of R125 and nitrogen is 80:20 in the superheated gas state. 95: 5, an absorbent material is used in the temperature-sensitive cylinder, and diatomaceous earth mainly composed of silicon dioxide is used as the absorbent material.

According to the temperature expansion valve of Claim 1 thru | or 4, the temperature of the main body of a temperature expansion valve fell with respect to the temperature of a temperature sensing cylinder by mixing and filling non-condensable gas in R125 different from an apparatus refrigerant | coolant. Even in this case, since the valve opening degree of the temperature expansion valve easily follows the temperature of the temperature sensing cylinder, the degree of superheat becomes less affected by the temperature of the main body of the temperature expansion valve, and the degree of superheat degree can be made constant.

It is a figure which shows the principal part of the refrigerating cycle to which the temperature expansion valve of embodiment of this invention is applied.

  Next, an embodiment of the temperature expansion valve of the present invention will be described. FIG. 1 is a diagram illustrating a main part of a refrigeration cycle to which the temperature expansion valve of the embodiment is applied. In FIG. 1, 10 is the temperature expansion valve of the embodiment, 20 is a compressor, 30 is a condenser, and 40 is an evaporator, and these are connected in a ring shape by piping to constitute a refrigeration cycle. The temperature expansion valve 10 includes a valve main body 1, a diaphragm device 2, a temperature sensitive cylinder 3, and a capillary tube 4. The primary side joint pipe 1a of the valve body 1 is connected to the primary pipe a on the condenser 30 side, the secondary side joint pipe 1b is connected to the secondary pipe b on the evaporator 40 side, and the pressure equalizing pipe 1c is an evaporator. It is connected to 40 outlet side pipes c.

  The compressor 20 compresses the apparatus refrigerant flowing through the refrigeration cycle, and the compressed apparatus refrigerant is condensed and liquefied by the condenser 30 and flows into the valve body 1 through the primary side joint pipe 1a. The valve main body 1 depressurizes (expands) the inflowing apparatus refrigerant and causes it to flow into the evaporator 40 from the secondary side joint pipe 1b. The evaporator 40 evaporates the apparatus refrigerant and circulates it in the compressor 20. A temperature sensing cylinder 3 is attached to the outlet side pipe c of the evaporator 40. The temperature sensing cylinder 3 is filled with a gas (and a liquid) which will be described later. The temperature sensing cylinder 3 is connected to the diaphragm device 2 by a capillary tube 4.

  As a mechanical configuration of the temperature expansion valve 10, a widely known general configuration can be adopted. For example, the diaphragm device 2 partitions the pressure receiving chamber connected to the temperature sensing cylinder 3 by the capillary tube 4 and the pressure equalizing chamber connected to the outlet side piping c of the evaporator 40 by the pressure equalizing tube 1c by the diaphragm. It is configured. The valve body 1 is configured to adjust the valve opening degree of a valve port formed between the primary pipe 1a and the secondary pipe 1b by a valve body connected to a diaphragm. Then, the valve opening degree of the valve port through which the apparatus refrigerant flows is controlled by the differential pressure between the internal pressure of the pressure receiving chamber that changes according to the temperature sensed by the temperature sensing cylinder 3 and the evaporation pressure introduced from the evaporator into the pressure equalizing chamber. Then, superheat control of the refrigeration cycle is performed.

  The apparatus refrigerant flowing through the piping of the refrigeration cycle is R410A. The temperature sensing cylinder 3 is filled with a mixture of R410A, which is an apparatus refrigerant for the refrigeration cycle, or a refrigerant different from R410A and a non-condensable gas or an absorbent. That is, the temperature sensitive cylinder 3 is filled with a mixed gas cross charge method. Next, examples of the refrigerant, non-condensable gas, and absorbent material different from the R410A according to the mixed gas cross charge method will be described.

The first reference example is an example in which the temperature sensitive cylinder 3 is filled with the apparatus refrigerant, and R410A and non-condensable gas are filled into the temperature sensitive cylinder 3 by a mixed gas cross-charge method.

In the first to fifth embodiments, the temperature sensitive cylinder 3 is filled with a refrigerant different from the apparatus refrigerant. In the first embodiment, the refrigerant different from R410A is R125, the non-condensable gas is nitrogen gas, and R125 and nitrogen gas are filled into the temperature sensing cylinder 3 by the mixed gas cross-charge method.

In the second embodiment, the refrigerant different from R410A is R125, the non-condensable gas is nitrogen gas, and R125 and nitrogen gas are charged into the temperature sensing cylinder 3 by the mixed gas cross-charge method. The volume ratio of R125 and nitrogen gas is in the range from 80:20 to 95: 5 in the superheated gas state.

In the third embodiment, the refrigerant different from R410A is R125, the non-condensable gas is nitrogen gas, and R125 and nitrogen gas are charged into the temperature sensing cylinder 3 by the mixed gas cross-charge method. The volume ratio of R125 and nitrogen gas is in the range from 80:20 to 95: 5 in the superheated gas state. Further, an absorbent material is used in the temperature sensitive cylinder 3.

In the fourth embodiment, the refrigerant different from R410A is R125, the non-condensable gas is nitrogen gas, and R125 and nitrogen gas are charged into the temperature sensing cylinder 3 by the mixed gas cross-charge method. The volume ratio of R125 and nitrogen gas is in the range from 80:20 to 95: 5 in the superheated gas state. Further, a material mainly composed of calcium silicate is used as an absorbent in the temperature sensitive cylinder 3.

In the fifth embodiment, the refrigerant different from R410A is R125, the non-condensable gas is nitrogen gas, and R125 and nitrogen gas are charged into the temperature sensing cylinder 3 by the mixed gas cross-charge method. The volume ratio of R125 and nitrogen gas is in the range from 80:20 to 95: 5 in the superheated gas state. Further, diatomaceous earth containing silicon dioxide as a main component is used as an absorbent in the temperature sensitive cylinder 3.

As a reference example, the non-condensable gas is not limited to nitrogen gas, but may be argon, carbon dioxide, or helium.

  With the configuration of the temperature sensing tube described above, a substantially constant degree of superheat can be obtained in the evaporation temperature range controlled by the temperature expansion valve 10. For example, in the evaporation temperature range of −20 ° C. to 10 ° C., the superheat degree deviation can be set to 1 ° C. or less.

  Even when the temperature of the main body of the temperature expansion valve 10 is decreased with respect to the temperature of the temperature sensing cylinder 3 by mixing and filling the non-condensable gas with R125, the valve opening degree of the temperature expansion valve 10 is the temperature sensing cylinder. 3 (temperature at the outlet of the evaporator) can be easily followed, so that the degree of superheat is hardly affected by the temperature of the main body of the temperature expansion valve 10, and the degree of superheat degree can be made constant.

  When the temperature of the main body of the temperature expansion valve 10 is decreased with respect to the temperature of the temperature sensing cylinder 3 by mixing the volume ratio of R125 and nitrogen in the range of 80:20 to 95: 5 in the superheated gas state. However, since the valve opening degree of the temperature expansion valve 10 easily follows the temperature of the temperature sensing cylinder 3 (temperature at the outlet of the evaporator), the degree of superheat becomes less affected by the temperature of the main body of the temperature expansion valve 10, and the degree of superheat. The deviation can be made constant.

DESCRIPTION OF SYMBOLS 1 Valve main-body part 2 Diaphragm apparatus 3 Temperature sensing cylinder 4 Capillary tube 10 Temperature expansion valve 20 Compressor 30 Condenser 40 Evaporator

Claims (4)

  A temperature expansion valve used in an air conditioner, refrigeration, and refrigeration apparatus using R410A as an apparatus refrigerant for a refrigeration cycle, and a mixed gas cloth that fills a temperature sensitive cylinder with a refrigerant different from the apparatus refrigerant and a non-condensable gas The charging method is used, R125 is used as a refrigerant different from the apparatus refrigerant, nitrogen is used as the non-condensable gas, and the volume ratio of R125 and nitrogen is 80:20 to 95: 5 in the superheated gas state. A temperature expansion valve.   A temperature expansion valve used in an air conditioner, refrigeration, and refrigeration apparatus using R410A as an apparatus refrigerant for a refrigeration cycle, and a mixed gas cloth that fills a temperature sensitive cylinder with a refrigerant different from the apparatus refrigerant and a non-condensable gas Using a charging method, using R125 as a refrigerant different from the apparatus refrigerant, using nitrogen as the non-condensable gas, and changing the volume ratio of R125 and nitrogen from 80:20 to 95: 5 in a superheated gas state, A temperature expansion valve characterized by using an absorbent material inside.   A temperature expansion valve used in an air conditioner, refrigeration, and refrigeration apparatus using R410A as an apparatus refrigerant for a refrigeration cycle, and a mixed gas cloth that fills a temperature sensitive cylinder with a refrigerant different from the apparatus refrigerant and a non-condensable gas Using a charging method, using R125 as a refrigerant different from the apparatus refrigerant, using nitrogen as the non-condensable gas, and changing the volume ratio of R125 and nitrogen from 80:20 to 95: 5 in a superheated gas state, A temperature expansion valve characterized in that an absorbent material is used therein and a material mainly composed of calcium silicate is used as the absorbent material.   A temperature expansion valve used in an air conditioner, refrigeration, and refrigeration apparatus using R410A as an apparatus refrigerant for a refrigeration cycle, and a mixed gas cloth that fills a temperature sensitive cylinder with a refrigerant different from the apparatus refrigerant and a non-condensable gas Using a charging method, using R125 as a refrigerant different from the apparatus refrigerant, using nitrogen as the non-condensable gas, and changing the volume ratio of R125 and nitrogen from 80:20 to 95: 5 in a superheated gas state, A temperature expansion valve characterized in that an absorbent material is used therein and diatomaceous earth containing silicon dioxide as a main component is used as the absorbent material.

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