JPH05172275A - Thermosensitive expansion valve with internally uniform pressure - Google Patents

Abstract

PURPOSE:To drive a thermo-sensitive expansion valve with a low degree of over-heating by correcting the pressure loss at an evaporator. CONSTITUTION:An expansion valve of internally equalized pressure type is composed of a valve body 12 with internally equalized pressure and a thermo- sensitive cylinder 13 of adsorptive charge type which is connected with the valve body 12 and which encapsulates an adsorbent X such as activated coal and a gas adsorbed thereto, wherein the thermosensitive cylinder 13 is fitted with a pressure adjusting means 29 to adjust the internal pressure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal pressure equalizing type expansion valve used as a pressure reducing means for a refrigerating apparatus.

[0002]

2. Description of the Related Art As a pressure reducing means of a refrigerating apparatus (for example, refrigerating refrigerating apparatus) equipped with an evaporator having a large pressure loss, an internal pressure equalizing type temperature sensitive expansion valve must be used because of cost and piping structure restrictions. In some cases, it does not (see, for example, Japanese Utility Model Laid-Open No. 56-134468).

However, in the case of the internal pressure equalizing type temperature sensitive expansion valve,
A temperature sensitive cylinder filled with the same gas refrigerant as the circulating refrigerant is attached to the suction pipe of the compressor to change the temperature of the suction pipe (in other words,
Since the opening of the temperature-sensitive expansion valve is controlled according to the change in the temperature of the suction gas refrigerant, when a large pressure loss occurs in the evaporator, the suction pipe temperature decreases in response to the pressure loss. Therefore, the opening of the temperature-sensing expansion valve is tightened by the temperature-sensing cylinder that has detected the lowered intake pipe temperature, and the degree of superheat is increased. Therefore, there is a possibility that problems such as capacity loss and rise in discharge gas temperature may occur in the refrigeration system.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and corrects the pressure loss in the evaporator to enable operation with a small degree of superheat. The purpose is to train them.

[0005]

In the invention of claim 1, as means for solving the above-mentioned problems, as shown in the drawings, an internal pressure equalizing type expansion valve main body 12 and the expansion valve main body 12 are provided.
In the internal pressure-equalizing expansion valve, which is connected to, and includes an adsorbent X such as activated carbon and an adsorbing charge type temperature sensitive tube 13 in which a gas adsorbed by the adsorbent X is enclosed, the temperature sensitive tube 13 Further, a pressure adjusting means 29 for adjusting the internal pressure is attached.

In the invention of claim 2, as a means for solving the above-mentioned problems, as shown in the drawings, an internal pressure equalizing type expansion valve main body 12 and a temperature sensing cylinder 13 connected to the expansion valve main body 12 are provided. In the internal pressure equalizing type temperature-sensing expansion valve having the above, the temperature sensing cylinder 13 is filled with a gas refrigerant for a refrigerating apparatus and a gas having a thermal expansion coefficient higher than that of the gas refrigerant.

In the invention of claim 3, as means for solving the above-mentioned problems, as shown in the drawing, it is used as a pressure reducing means of a refrigerating apparatus in which a heat source side unit A and a use side unit B are integrally constructed. , Internal pressure equalization type expansion valve body 1
2 and a temperature-sensitive cylinder 13 connected to the expansion valve body 12, an internal pressure-equalizing temperature-sensitive expansion valve comprising the temperature-sensitive cylinder 13
Is attached to the suction pipe 28 on the heat source side in a non-heatproof state.

In the invention of claim 4, as means for solving the above-mentioned problems, as shown in the drawing, the heat source side unit A and the use side unit B are used as a pressure reducing means for a refrigerating apparatus. , Internal pressure equalization type expansion valve body 1
In the internal pressure-equalizing temperature-sensitive expansion valve including the temperature-sensing cylinder 13 connected to the expansion valve body 12, the refrigeration apparatus is provided with a heat exchange section 34 for exchanging heat between the suction pipe 28 and the discharge pipe 33. In addition to being provided, the temperature sensitive tube 13 is attached to the suction pipe 28 which is located on the downstream side of the heat exchange section 34.

[0009]

According to the invention of claim 1, the following actions can be obtained by the above means.

That is, when the pressure adjusting means 29 is used to increase the internal pressure of the temperature sensitive tube 13 by the pressure loss, the pressure adjusting means 29 increases the pressure in the refrigerating apparatus having the evaporator 5 having a large pressure loss. The temperature-sensitive expansion valve is controlled by the opening degree in which the pressure loss amount in the evaporator 5 is corrected.

According to the second aspect of the invention, the following actions can be obtained by the above means.

That is, even if the temperature of the suction pipe 28 is lowered due to the pressure loss in the evaporator 5, the pressure loss component is caused by the thermal expansion of the gas having the thermal expansion coefficient larger than that of the gas refrigerant enclosed in the temperature sensing cylinder 13. Is corrected, and the temperature-sensitive expansion valve is controlled by the opening whose pressure loss is corrected.

According to the invention of claim 3, the following effects can be obtained by the above means.

That is, even if the temperature of the suction pipe 28 decreases due to the pressure loss in the evaporator 5, the temperature sensing cylinder 13 must detect a temperature higher than the actual suction pipe temperature (that is, the temperature corresponding to the degree of superheat). Therefore, the temperature-sensitive expansion valve is controlled by the opening whose pressure loss is corrected.

According to the invention of claim 4, the following actions can be obtained by the above means.

That is, even if the temperature of the suction pipe 28 decreases due to the pressure loss in the evaporator 5, the temperature sensing cylinder 13 detects the temperature of the suction pipe after the heat exchange with the discharge pipe 33. The temperature-sensitive expansion valve is controlled by the opening whose pressure loss is corrected.

[0017]

According to the invention of claim 1, an internal pressure equalizing type expansion valve main body 12, an adsorbent X such as activated carbon which is connected to the expansion valve main body 12, and a gas adsorbed to the adsorbent X are provided. In an internal pressure equalization type expansion valve having an adsorption charge type temperature sensitive tube 13 in which is sealed, the temperature sensitive tube 13 is provided with a pressure adjusting means 29 for adjusting an internal pressure to evaporate a large pressure loss. When used as a depressurizing means of a refrigerating apparatus equipped with the device 5, the pressure adjusting means 29 increases the internal pressure of the temperature sensitive cylinder 13 by the above-mentioned pressure loss, so that the temperature sensitive expansion valve can be operated by the evaporator 5. Since it is possible to control the pressure loss amount of the corrected opening, it is possible to operate with a small degree of superheat, the evaporator 5 can be used effectively, and
There is an excellent effect that an abnormal rise in the discharge gas temperature can be prevented.

According to the second aspect of the present invention, in the internal pressure equalizing type temperature sensitive expansion valve having the internal pressure equalizing type expansion valve main body 12 and the temperature sensing cylinder 13 connected to the expansion valve main body 12, Even if the temperature of the suction pipe 28 drops due to the pressure loss in the evaporator 5, the temperature-sensitive cylinder is filled with the gas refrigerant for the refrigeration system and the gas having a larger thermal expansion coefficient than the gas refrigerant in the warm cylinder 13. Thirteen
Since the pressure loss is corrected by the thermal expansion of a gas having a larger thermal expansion coefficient than the gas refrigerant enclosed therein, the temperature-sensitive expansion valve can be controlled with the opening for which the pressure loss is corrected. Further, there is an excellent effect that the operation can be performed with a small degree of superheat, the evaporator 5 can be effectively used, and an abnormal rise in the discharge gas temperature can be prevented.

According to the third aspect of the present invention, the heat source side unit A and the use side unit B are used as pressure reducing means of a refrigerating apparatus integrally formed, and the internal pressure equalizing type expansion valve main body 1 is used.
2 and a temperature-sensitive cylinder 13 connected to the expansion valve body 12, an internal pressure-equalizing temperature-sensitive expansion valve comprising the temperature-sensitive cylinder 13
Is attached to the suction pipe 28 of the heat source side unit A in a non-heat-proof state, and even if the temperature of the suction pipe 28 is lowered due to the pressure loss in the evaporator 5, the temperature sensing tube 13 causes the actual suction pipe temperature (that is, , The temperature corresponding to the degree of superheat is detected, and the temperature-sensitive expansion valve can be controlled with the opening that has been corrected for the pressure loss, so it is possible to operate with a small degree of superheat, and the evaporator can be operated. 5 has an excellent effect that it can be effectively used and an abnormal rise in discharge gas temperature can be prevented.

According to the invention of claim 4, the heat source side unit A and the use side unit B are used as a pressure reducing means of a refrigerating apparatus integrally formed, and an internal pressure equalizing type expansion valve main body 1 is used.
In the internal pressure-equalizing temperature-sensitive expansion valve including the temperature-sensing cylinder 13 connected to the expansion valve body 12, the refrigeration apparatus is provided with a heat exchange section 34 for exchanging heat between the suction pipe 28 and the discharge pipe 33. In addition to providing the temperature sensitive tube 13, the temperature sensitive tube 13 is attached to the suction pipe 28 on the downstream side of the heat exchange section 34, and even if the temperature of the suction pipe 28 is lowered by the pressure loss in the evaporator 5, 13 detects the temperature of the suction pipe after heat exchange with the discharge pipe 33, and controls the temperature-sensitive expansion valve with the opening for which the pressure loss is corrected. It has an excellent effect that it can be operated, the evaporator 5 can be effectively used, and an abnormal rise in discharge gas temperature can be prevented.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Some preferred embodiments of the present invention will be described below with reference to the accompanying drawings.

Embodiment 1 FIGS. 1 and 2 show an internal pressure-equalizing temperature-sensitive expansion valve according to Embodiment 1 of the present invention. The present embodiment corresponds to the invention of claim 1.

The internal pressure-equalizing temperature-sensitive expansion valve of this embodiment is used, for example, as a pressure reducing means of a refrigerating unit for refrigeration.

As shown in FIG. 2, the refrigerating apparatus has a refrigerant circulation system in which a compressor 1, a condenser 2, a dryer filter 3, a temperature-sensitive expansion valve 4, an evaporator 5 and an accumulator 6 attached to a compressor are sequentially connected. It is composed of cycles,
The compressor 1, the condenser 2 and the dryer filter 3 constitute a heat source side unit A located outside the refrigerator, and the temperature-sensitive expansion valve 4 and the evaporator 5 constitute a utilization side unit B located inside the refrigerator. .. Reference numeral 7 is a drain pan heater, 8 is an electromagnetic valve for controlling the refrigerant flow to the drain pan heater 7, 9 is a capillary tube for depressurizing the refrigerant passing through the drain pan heater 7, 10 is a condenser fan, and 11 is an evaporator fan.

The temperature-sensitive expansion valve 4 is, as shown in FIG.
It is composed of an internal pressure equalizing type expansion valve main body 12 and a temperature sensing cylinder 13 connected to a power head 15 of the expansion valve main body 12.

The expansion valve body 12 is provided with an inlet passage 16 connected to the condenser 2 side, an outlet passage 17 connected to the evaporator 5 side, and a valve chamber 18 communicating between the passages 16 and 17. The main body 14 and the power head 15 attached to the main body 14.

In the valve chamber 18, a valve body 20 for controlling the opening degree of a communication hole 19 that connects the valve chamber 18 and the outlet passage 17 is biased by a spring 21 in the valve closing direction. It is arranged in the state. Reference numeral 22 is the valve body 20.
And a valve support member provided between the spring and the spring 21,
Is a spring bridge.

On the other hand, the power head 15 is provided above the inlet passage 16 and comprises a pressure chamber 24 and a pressure equalizing chamber 25 which are vertically divided by a diaphragm 23. Valve support member 22
Between the movement of the diaphragm 23 and the valve support member 22.
A connecting rod 26 for transmission to the valve body is provided so as to pass through the valve body 14 and be slidable in the vertical direction. Therefore, the pressure equalizing chamber 25
The valve chamber 18 and the valve chamber 18 are communicated with each other through a through hole 27 for allowing the connecting rod 26 to penetrate therethrough. Code 3
A washer 6 is interposed between the connecting rod 26 and the diaphragm 23.

The temperature sensitive cylinder 13 is of an adsorption charge type in which activated carbon X acting as an adsorbent and carbon dioxide gas which is a gas adsorbed by the activated carbon X are enclosed, and the pressure chamber 24 of the power head 15 is used. It is connected to the. In the case of the present embodiment, the temperature sensing cylinder 13 is the suction pipe 28 of the compressor 1.
It is attached to the part on the side of the use side unit B (that is, inside the refrigerator).

Therefore, in this embodiment, the temperature-sensing cylinder 13 has a pressure adjusting means 2 for adjusting the internal pressure.
9 is attached. The pressure adjusting means 29 includes a cylindrical case 30 connected to the temperature sensitive cylinder 13 and the cylindrical case 3
It is composed of a bellows 31 arranged in a state of being in communication with the temperature-sensitive cylinder 13 in an internal space 0, and an adjusting screw 32 screwed into the cylindrical case 30 to adjust the internal volume of the bellows 31. That is, the internal volume of the bellows 31 is increased / decreased by changing the screwing degree of the adjusting screw 32, and the pressure in the temperature sensing cylinder 13 is increased / decreased as the internal volume is increased / decreased.

The internal pressure-equalizing temperature-sensitive expansion valve constructed as described above operates as follows.

When the pressure loss in the evaporator 5 of the refrigerating apparatus is large, the adjusting screw 32 in the pressure adjusting means 29 is used.
The inner volume of the bellows 31 is reduced by increasing the screwing degree of the above, and the internal pressure of the temperature sensing cylinder 13 is increased. Then, even if the temperature of the suction pipe 28 is slightly lowered due to the pressure loss, the pressure loss is corrected and the power head 15 in the expansion valve body 12 receives a pressure higher than the actual superheat degree. Therefore, the opening degree of the temperature-sensitive expansion valve is controlled to be larger. Therefore, the operation can be performed with a small degree of superheat, the evaporator 5 can be effectively used, and an abnormal rise in the discharge gas temperature can be prevented.

Embodiment 2 FIG. 3 shows an internal pressure-equalizing temperature-sensitive expansion valve according to Embodiment 2 of the present invention. The present embodiment corresponds to the invention of claim 2.

In the case of the present embodiment, the inside of the temperature sensitive cylinder 13 is the same gas refrigerant as the circulating refrigerant of the refrigerating apparatus (CFC R22 in the case of this embodiment) and a gas having a larger thermal expansion coefficient than the gas refrigerant (the present embodiment). In the case of, nitrogen gas) and is enclosed. The other configuration is similar to that of the first embodiment, and thus the description is omitted.

In the case of the temperature-sensitive expansion valve having the above-mentioned structure, TP of FIG. 4 showing the relationship between the temperature-sensitive cylinder temperature T and the temperature-sensitive cylinder pressure P.
As seen in the characteristic curve, the static superheat minimum point curve Z
However, as compared with the conventional one Z'where only the single gas refrigerant (for example, Freon R22) is enclosed, the amount of nitrogen is increased. Therefore, as can be seen from the ΔT-S characteristic curve of FIG. 5, which shows the relationship between the degree of superheat ΔT and the opening degree S of the temperature-sensitive expansion valve,
The stationary superheat degree T ₀ is set to be on the negative side of the conventional one gas refrigerant (for example, Freon R22) sealed only T ₀ ′. In FIG. 4, Z ₀ is a fluorocarbon R22.
Is a saturation curve, Y is a ΔT-S characteristic curve in this embodiment,
Y'denotes the ΔT-S characteristic curve in the conventional example.

In the case of the present embodiment, even if the pressure loss of the evaporator 5 becomes large, the static superheat degree ΔT is set to the negative side as compared with the conventional example, as described above, and therefore the operating superheat degree ΔT. ₁ is much smaller than that of the conventional example ΔT ₁ ′.
Therefore, it becomes possible to operate with a small superheat, and the evaporator 5
Can be effectively used, and an abnormal rise in discharge gas temperature can be prevented.

Embodiment 3 FIG. 6 shows a refrigerating apparatus using an internal pressure-equalizing temperature-sensitive expansion valve according to Embodiment 3 of the present invention. In this example,
This corresponds to the invention of claim 3.

In the case of the present embodiment, as the temperature-sensitive cylinder 13, one in which the same gas refrigerant as the circulating refrigerant of the refrigerating device is sealed is used. The temperature sensitive tube 13 is the heat source side unit A side portion of the suction pipe 28 of the compressor 1 (that is, the outside of the refrigerator).
It is attached to the non-heatproof state. The other configuration is similar to that of the first embodiment, and thus the description is omitted.

With the above-mentioned structure, even if the temperature of the suction pipe 28 decreases due to the pressure loss in the evaporator 5, the temperature-sensitive cylinder 1
Since 3 detects a temperature higher than the actual intake pipe temperature (that is, the temperature corresponding to the degree of superheat), the temperature-sensitive expansion valve is controlled with the opening whose pressure loss is corrected. Therefore, the operation can be performed with a small degree of superheat, the evaporator 5 can be effectively used, and an abnormal rise in the discharge gas temperature can be prevented.

Embodiment 4 FIG. 7 shows a refrigerating apparatus using an internal pressure-equalizing temperature-sensitive expansion valve according to Embodiment 4 of the present invention. In this example,
This corresponds to the invention of claim 4.

In the case of this embodiment, the refrigerating apparatus includes a compressor 1
Heat exchange section 3 for exchanging heat between the suction pipe 28 and the discharge pipe 33 of
4 is provided, and the temperature sensitive cylinder 13 is attached to the suction pipe 28 which is located on the downstream side of the heat exchange section 34. Even in the case of this embodiment, the temperature-sensitive cylinder 13 is
The one in which the same gas refrigerant as the circulating refrigerant of the refrigeration system is enclosed is used. The other configuration is similar to that of the first embodiment, and thus the description is omitted.

With the above-mentioned structure, even if the temperature of the suction pipe 28 is lowered due to the pressure loss in the evaporator 5, the temperature of the temperature sensing cylinder 13 becomes equal to the temperature of the suction pipe after the heat exchange with the discharge pipe 33. Since the temperature-sensitive expansion valve is detected, the temperature-sensitive expansion valve is controlled by the opening whose pressure loss is corrected. Therefore, the operation can be performed with a small degree of superheat, the evaporator 5 can be effectively used, and an abnormal rise in the discharge gas temperature can be prevented.

The invention of the present application is not limited to the configuration of each of the above-described embodiments, and it goes without saying that the design can be changed as appropriate without departing from the scope of the invention.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an internal pressure-equalizing temperature-sensitive expansion valve according to a first embodiment of the present invention.

FIG. 2 is a refrigerant circuit diagram of the refrigerating apparatus using the internal pressure-equalizing temperature-sensitive expansion valve according to the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view of an internal pressure-equalizing temperature-sensitive expansion valve according to a second embodiment of the present invention.

FIG. 4 is a characteristic diagram showing the relationship between the temperature-sensitive cylinder temperature and the temperature-sensitive cylinder pressure in the internal pressure-equalizing expansion valve according to the second embodiment of the present invention and the conventional example.

FIG. 5 is a characteristic diagram showing the relationship between the degree of superheat and the opening degree in the internal pressure-equalizing expansion valve according to the second embodiment of the present invention and the conventional example.

FIG. 6 is a refrigerant circuit diagram of a refrigeration system using an internal pressure-equalizing temperature-sensitive expansion valve according to a third embodiment of the present invention.

FIG. 7 is a refrigerant circuit diagram of a refrigeration system using an internal pressure-equalizing temperature-sensitive expansion valve according to a fourth embodiment of the present invention.

[Explanation of symbols]

1 is a compressor, 2 is a condenser, 4 is a temperature-sensitive expansion valve, 5 is an evaporator, 12 is an expansion valve body, 13 is a temperature-sensing cylinder, 28 is a suction pipe,
29 is a pressure adjusting means, 33 is a discharge pipe, 34 is a heat exchange section,
A is a heat source side unit, B is a use side unit, and X is activated carbon.

Claims (4)

[Claims] 1. An internal pressure equalizing type expansion valve main body (12), an adsorbent (X) such as activated carbon which is connected to the expansion valve main body (12) and a gas adsorbed by the adsorbent (X). An internal pressure equalizing type expansion valve having an adsorbing charge type temperature sensitive tube (13) enclosed therein, wherein the temperature sensitive tube (13) is provided with a pressure adjusting means (29) for adjusting an internal pressure. An internal pressure equalization type temperature-sensing expansion valve characterized in that 2. An internal pressure equalization type temperature-sensitive expansion valve comprising an internal pressure equalization type expansion valve main body (12) and a temperature sensitive tube (13) connected to the expansion valve main body (12), In the temperature sensing tube (13),
An internal pressure-equalizing temperature-sensitive expansion valve, characterized in that a gas refrigerant for a refrigerating device and a gas having a larger thermal expansion coefficient than the gas refrigerant are enclosed. 3. A heat source side unit (A) and a use side unit
(B) is used as a pressure reducing means of a refrigerating device integrally configured, and includes an internal pressure equalizing type expansion valve main body (12) and a temperature sensing cylinder (13) connected to the expansion valve main body (12). An internal pressure-equalizing type temperature-sensing expansion valve, comprising: the temperature-sensing cylinder (13) attached to a suction pipe (28) of a heat source side unit (A) in a non-heat insulating state. Thermal expansion valve. 4. A heat source side unit (A) and a use side unit
(B) is used as a pressure reducing means of a refrigerating device integrally configured, and includes an internal pressure equalizing type expansion valve main body (12) and a temperature sensing cylinder (13) connected to the expansion valve main body (12). An internal pressure equalizing type temperature-sensing expansion valve equipped with a suction pipe (28) in the refrigeration system.
A heat exchange part (34) for exchanging heat between the discharge pipe (33) and the discharge pipe (33) is provided, and the temperature sensitive tube (13) is connected to the heat exchange part (34).
An internal pressure-equalizing temperature-sensitive expansion valve, characterized by being attached to a suction pipe (28) on the downstream side of the.