JPH08135841A - Temperature type expansion valve - Google Patents

Abstract

PURPOSE: To reduce the noise generated when refrigerant passes by eliminating the use of soundproof material, which causes an increase in costs, that is, by suppressing an increase in costs and weight as much as possible. CONSTITUTION: A temperature type expansion valve 1 is provided with a diaphragm 13 which displaces according to the pressure fluctuation in a temperature sensing cylinder 9. This diaphragm 13 is held by the diaphragm case 18 of a valve housing 12 and the diaphragm cover 19 fixed to this diaphragm case 18 and forms a diaphragm chamber 20, to which the evaporating pressure of a refrigerant evaporator works, between itself and the diaphragm case 18 and also forms another diaphragm chamber 21, to which the pressure in the temperature sensing cylinder 9 works through a capillary tube 10, between itself and the diaphragm cover 19. The diaphragm cover 19 is jointed by a mass body 28 at its center section, and the capillary tube 10 is fixed to this mass body 28.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal expansion valve used in a refrigeration cycle.

[0002]

2. Description of the Related Art In recent years, as vehicles have become quieter, there is a strong demand for reduction of refrigerant passing noise in expansion valves used in refrigeration cycles of air conditioners. Therefore,
As a measure for reducing the refrigerant passing sound, conventionally, a soundproof material (for example, a rubber material) is attached to the entire expansion valve.

[0003]

However, in order to reduce the noise passing through the refrigerant to an unnoticeable noise level, the amount of the soundproof material is increased, so that the cost and weight of the soundproof material are increased, and as a result, There is a problem that the cost and weight of the expansion valve increase. Therefore, the inventor of the present application considered a technical means for reducing the refrigerant passing sound without using a soundproof material.

As a result of studying the mechanism of generation of the refrigerant passing sound in the consideration process, the fluid sound (the sound of the refrigerant flowing) generated inside the expansion valve resonates in the diaphragm cover (the vibration in which the center of the diaphragm cover becomes the antinode of vibration). It was found that it was amplified by the mode). That is, it was found that the amplified fluid sound was emitted to generate the refrigerant passing sound. Therefore, in order to reduce the refrigerant passing sound,
It can be said that it is effective to suppress the vibration of the diaphragm cover. The present invention has been made based on the above circumstances, and an object thereof is to reduce the noise passing through the refrigerant without using a soundproof material that causes a cost increase, that is, suppressing the cost increase and the weight increase to be small. To provide a temperature expansion valve.

[0005]

The present invention has the following features to attain the object mentioned above. In claim 1,
One diaphragm chamber is formed between the valve housing and a diaphragm case fixed to the valve housing, and the other diaphragm chamber is formed between the valve housing and the diaphragm cover, and the one diaphragm chamber and the other diaphragm are formed. Equipped with a diaphragm that is displaced according to the pressure difference with the chamber, and by controlling the valve opening in conjunction with the displacement of this diaphragm, the refrigerant flow rate is adjusted so that the gas refrigerant at the refrigerant evaporator outlet has a certain degree of superheat. In the temperature expansion valve to be adjusted, the diaphragm cover is provided with a mass body.

According to a second aspect of the present invention, in the temperature type expansion valve according to the first aspect, the temperature change of the refrigerant that is provided in thermal contact with the outlet side pipe of the refrigerant evaporator and flows through the outlet side pipe. It is characterized in that a temperature sensitive cylinder whose internal pressure changes in accordance with the above is provided, and the temperature sensitive cylinder is provided in communication with the other diaphragm chamber via a capillary tube.

According to a third aspect of the present invention, in the thermal expansion valve according to the second aspect, the capillary tube is fixed to the diaphragm cover via the mass body.

According to a fourth aspect of the present invention, in the thermal expansion valve according to any one of the first to third aspects, the mass body is joined to a central portion of the diaphragm cover.

[0009]

In the temperature type expansion valve according to the first aspect of the present invention, the diaphragm cover is provided with the mass body, so that the vibration of the diaphragm cover generated when the refrigerant passes through the inside of the expansion valve is suppressed. As a result, the degree to which the fluid sound is amplified by the vibration of the diaphragm cover is reduced, so that the refrigerant passing sound is reduced. According to the second aspect, in the temperature type expansion valve in which the temperature sensitive tube is provided in communication with the other diaphragm chamber via the capillary tube, the mass body of the present invention is provided in the diaphragm cover to reduce the refrigerant passing sound. Can be planned.

According to the third aspect, the capillary tube is fixed to the diaphragm cover through the mass body.
That is, by joining the mass body to the diaphragm cover in a state where the end portion of the capillary tube is held by the mass body, the capillary tube is fixed to the diaphragm cover and communicated with the other diaphragm chamber. Claim 4
According to this, the vibration of the diaphragm cover can be effectively suppressed by joining the mass body to the central portion of the diaphragm cover having the largest vibration (amplitude).

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the temperature type expansion valve of the present invention will be described below with reference to FIGS. FIG. 1 is a sectional view of a thermal expansion valve. This temperature expansion valve (hereinafter abbreviated as expansion valve 1)
Is, as shown in FIG. 3, the refrigerant compressor 2, the refrigerant condenser 3,
A well-known refrigeration cycle S is configured with the functional parts of the receiver 4 and the refrigerant evaporator 5, and they are connected by a refrigerant pipe 6.

The expansion valve 1 includes a valve body 7 arranged upstream of the refrigerant evaporator 5, an outer equalizing pipe 8 for introducing an outlet pressure (evaporation pressure) of the refrigerant evaporator 5, and an outlet side pipe 6a of the refrigerant evaporator 5. And a capillary tube 10 connecting the valve body 7 and the temperature-sensitive cylinder 9. As shown in FIG. 1, the valve body 7 includes a valve housing 1 in which a refrigerant passage 11 is formed.
2. A diaphragm 13 that is displaced according to the pressure fluctuation in the temperature-sensitive cylinder 9, and a valve body 14 (ball valve) that adjusts the refrigerant flow rate in conjunction with the displacement of the diaphragm 13.

The valve housing 12 is provided with an orifice 15 for narrowing the passage cross-section area in the middle of the refrigerant passage 11, a high pressure side passage 11a upstream of the orifice 15 and a low pressure side passage 11b downstream of the orifice 15. And are formed so as to form a substantially right angle. Also, the valve housing 12
Includes a through hole 16 penetrating from the low pressure side passage 11b to the upper end surface of the valve housing 12, and an L-shaped pressure introducing passage 1 extending from the upper end surface to the side surface of the valve housing 12.
7 are provided. The orifice 15 and the through hole 1
6 is provided at a position (on the same central axis) that intersects the low pressure side passage 11b and faces each other.

The diaphragm 13 is made of, for example, a thin plate of stainless steel, and has a diaphragm case 18 screwed to the upper end of the valve housing 12 and the diaphragm case 1.
It is sandwiched by a diaphragm cover 19 which is fixed to 8, and one diaphragm chamber 20 is formed between the diaphragm case 18 and the valve housing 12, and the other diaphragm chamber 21 is formed between the diaphragm cover 19 and the diaphragm cover 19.

The valve body 14 changes the opening degree of the orifice 15 (hereinafter referred to as valve opening degree) in association with the displacement of the diaphragm 13, and is arranged upstream of the orifice 15 (inside the high pressure side passage 11a). Is connected to a stopper 23 fixed to the lower surface of the diaphragm 13 via a valve rod 22 and is urged by a spring 25 via a valve receiving member 24.

The valve rod 22 traverses the inside of the refrigerant passage 11,
It passes through the through hole 16 and the orifice 15 and has one end fixed to the stopper 23 in the one diaphragm chamber 20 and the other end fixed to the valve body 14 in the high pressure side passage 11a. However, the valve rod 22 has an O-ring 26 inside the through hole 16.
Is airtightly supported by. Therefore, the low pressure side passage 11
The refrigerant pressure in b does not act on one diaphragm chamber 20 through the through hole 16.

The spring 25 has a valve receiving member 24 at one end.
And the other end is formed into an adjusting screw 27 screwed into the high pressure side passage 11a, and biases the valve body 14 in a direction in which the opening degree of the orifice 15 decreases (upward in FIG. 1). There is.
The adjusting screw 27 adjusts the mounting load of the spring 25 according to the screwing position with respect to the valve housing 12.

The outer equalizing pipe 8 has one end connected to the outlet side pipe 6a of the refrigerant evaporator 5 and the other end connected to the pressure introducing passage 17, so that the evaporating pressure of the refrigerant evaporator 5 is passed through the pressure introducing passage 17 to one side. It is introduced into the diaphragm chamber 20 of. The temperature sensitive tube 9 is connected to the other diaphragm chamber 2 via the capillary tube 10.
1 is connected to the closed space from the other diaphragm chamber 21 through the capillary tube 10 to the inside of the temperature-sensitive cylinder 9, and the temperature-sensitive gas (for example, the gas to be sealed in the refrigeration cycle is degassed after vacuum deaeration). The same as the refrigerant) is enclosed. The capillary tube 10 is connected to the central portion of the diaphragm cover 19 via the mass body 28.

As shown in FIG. 2 (a perspective view of the mass body 28), the mass body 28 is an annular body having a circular hole 28a having a circular cross section passing through the central portion, and one end face central portion 28b has a circular shape. It is formed one step higher than the outer peripheral portion (corresponding to the plate thickness of the diaphragm cover 19). This mass 28 is shown in FIG.
As shown in FIG. 5, the end face central portion 28b is arranged inside the diaphragm cover 19 (the other diaphragm chamber 21), and the end face central portion 28b is fitted into a fitting hole formed in the central portion of the diaphragm cover 19 for welding, brazing, and bonding. Etc. are joined airtightly. The mass body 28 is formed of, for example, stainless steel, aluminum, or general structural steel, and has a weight of about 6 to 10 g.

The end portion of the capillary tube 10 is inserted into the round hole 28a of the mass body 28, and the capillary tube 10 is hermetically joined by a method such as welding, brazing, or bonding,
It communicates with the other diaphragm chamber 21.

Next, the operation of the expansion valve 1 of this embodiment will be described. In the expansion valve 1 of the present embodiment, the pressure inside the temperature-sensitive cylinder 9 is introduced into the other diaphragm chamber 21 via the capillary tube 10, and the outlet pressure (evaporation pressure) of the refrigerant evaporator 5 is equal to that of the outer equalizing tube 8 and the pressure. It is introduced into one diaphragm chamber 20 via the introduction passage 17. Therefore, the diaphragm 13 is balanced at a position where the pressure of the other diaphragm chamber 21 and the pressure of the one diaphragm chamber 20 + the biasing force of the spring 25 are balanced. Then, the displacement of the diaphragm 13 is transmitted to the valve body 14 via the stopper 23 and the valve rod 22, and the position of the valve body 14 with respect to the orifice 15 is changed to change the valve opening degree. As a result, the expansion valve 1
The flow rate of the refrigerant passing through the orifice 15 can be adjusted by controlling the valve opening so that the gas refrigerant at the outlet of the refrigerant evaporator 5 has a certain degree of superheat.

This expansion valve 1 has a diaphragm cover 19
Since the mass body 28 is joined to the central portion of the diaphragm cover 1, the diaphragm cover 1 is generated when the refrigerant flows through the refrigerant passage.
The vibration of 9 is suppressed. As a result, the sound of the refrigerant flowing inside the expansion valve 1, that is, the sound of the fluid, is less amplified by the vibration of the diaphragm cover 19.
As shown in FIG. 4, the refrigerant passing noise can be reduced as compared with the conventional product that does not include the mass body 28.

Next, a second embodiment of the present invention is shown in FIG.
FIG. 5 is a sectional view of the expansion valve according to the second embodiment. In the present embodiment, the expansion valve 1 in which the capillary tube 10 is joined at a position displaced from the center of the diaphragm cover 19
The mass body 28 is joined to the center of the diaphragm cover 19. Also in this embodiment, the first
The same effect as the embodiment can be obtained.

Next, a third embodiment of the present invention is shown in FIG.
FIG. 6 is a sectional view of an expansion valve according to the third embodiment. In the expansion valve 1 of this embodiment, the pressure inside the temperature sensitive rod 29 built in the valve housing 12 acts on one diaphragm chamber 20,
The evaporating pressure of the refrigerant evaporator 5 acts on the other diaphragm chamber 21 via the pressure equalizing pipe 30. Temperature sensitive stick 29
Has the function of the temperature-sensing cylinder 9 shown in the first embodiment, and is connected to one of the diaphragm chambers 20 inside the greenhouse 2.
9a is formed, and a temperature change of the gas refrigerant flowing out from the refrigerant evaporator 5 is sensed as a pressure change.

Therefore, the first embodiment differs from the pressure acting on one diaphragm chamber 20 and the other diaphragm chamber 2
The pressure acting on 1 is reversed. A gas refrigerant passage 31 that connects the outlet side of the refrigerant evaporator 5 and the suction side of the refrigerant compressor 2 is formed in the valve housing 12, and the temperature sensitive rod 29 is disposed across the inside of the gas refrigerant passage 31. Has been done. Also in this expansion valve 1, as shown in FIG. 6, by joining the mass body 28 to the diaphragm cover 19, the effect of reducing the refrigerant passing sound can be obtained as in the first embodiment.

Next, a fourth embodiment of the present invention is shown in FIGS. FIG. 7 is a sectional view of the expansion valve 1 according to the fourth embodiment. The expansion valve 1 of the present embodiment transmits the temperature change of the gas refrigerant flowing through the gas refrigerant passage 31 to the other diaphragm chamber 21 via the temperature sensing rod 29, and fills the other diaphragm chamber 21 according to the temperature change. The temperature-sensitive gas thus formed forms a structure that causes a pressure change. Also in this expansion valve 1, as shown in FIG. 7, by joining the mass body 28 to the diaphragm cover 19, the effect of reducing the refrigerant passing sound can be obtained as in the first embodiment.

In the expansion valve 1 shown in FIG. 7, the tube 32 connected to the diaphragm cover 19 is an introduction tube used when introducing and sealing the temperature-sensitive gas in the other diaphragm chamber 21. There is no need. Therefore, the mass body 28 without the tube 32
An example of attachment of is shown in FIGS. 8 and 9.

In the example shown in FIG. 8, after the temperature-sensitive gas is introduced into the other diaphragm chamber 21, the diaphragm cover 1
The mass body 28 is adhered, press-fitted, brazed into the fitting hole formed in the central portion of the diaphragm cover 19 from the outside of 9.
It is hermetically connected by welding or the like. In the example shown in FIG. 9, the mass body 28 having the circular hole 28a penetrating through the central portion is connected from the inside of the diaphragm cover 19 to the fitting hole formed in the central portion of the diaphragm cover 19. The round hole 28a penetrating the mass body 28 is provided after the temperature-sensitive gas is introduced into the other diaphragm chamber 21 through the round hole 28a.
It is closed airtight by the blind plug 33.

Next, a fifth embodiment of the present invention is shown in FIG. FIG. 10 is a cross-sectional view showing a joined state of the mass body 28. The mass body 28 is arranged outside the diaphragm cover 19 as shown in FIG.
The end face central portion 28b of the mass body 28 may be fitted and joined to the fitting hole of the diaphragm cover 19 from the outside.
Similar to the first embodiment, the capillary tube 10 is inserted into the round hole 28a of the mass body 28 (however, in the opposite direction to the first embodiment) and airtightly joined to communicate with the other diaphragm chamber 21. .

Next, a sixth embodiment of the present invention is shown in FIGS. 11 is a cross-sectional view showing a joined state of the mass body 28, and FIG. 12 is a perspective view of the mass body 28. Mass 28
May have a ring shape as shown in FIG. 12, and may be joined to the outer wall surface of the diaphragm cover 19. For example, it is also possible to form a ring shape having a size that surrounds the periphery of the raised portion 19a in accordance with the shape in which the central portion of the diaphragm cover 19 is raised, and join the flat surface of the diaphragm cover 19 that is continuous from the raised portion 19a. The capillary tube 10 is directly joined to the diaphragm cover 19. In this embodiment, it is not necessary to modify the conventional expansion valve, that is, the expansion valve in which the capillary tube 10 is joined to the diaphragm cover 19, and it is sufficient to join the mass body 28 to the diaphragm cover 19, and therefore the manufacturing is possible. It's easy.

Next, a seventh embodiment of the present invention is shown in FIGS. FIG. 13 is a cross-sectional view showing the joined state of the mass body 28, and FIG. 14 is a plan view showing the joined state of the mass body 28. The mass body 28 does not have to be one, and a plurality of mass bodies can be used. For example, as shown in FIG. 14, four mass bodies 28 ′ may be distributed around the raised portion 19 a of the diaphragm cover 19 and bonded to the diaphragm cover 19. In this case, each mass body 28 'may have a uniform or non-uniform mass, and the distribution position may be uniform or non-uniform. Further, the number of mass bodies 28 'need not be four. In the example shown in FIGS. 13 and 14, when the total mass of the four mass bodies 28 'is the same as that of the mass body 28 shown in the first embodiment, it is about 60% of that in the first embodiment. A reduction effect can be obtained.

Next, an eighth embodiment of the present invention will be described with reference to FIGS.
7 shows. 15 to 17 are perspective views of the mass body 28, respectively. It is not necessary to specify the shape of the mass body 28, and for example, FIG. 15 (a), FIG. 16 (a), FIG.
The shape shown in FIG. Further, these mass bodies 28 are shown in FIG. 15 (b), FIG. 16 (b), and FIG. 17 (b).
The opposite surface may be joined to the diaphragm cover 19 as shown in FIG.

(Modification) In each of the above-described embodiments, the diaphragm case 18 is fixed to the valve housing 12 and one diaphragm chamber 20 is formed between the diaphragm case 18 and the diaphragm 13. However, the diaphragm case 18 is formed in the valve housing 12. The diaphragm case 18 is formed by forming the corresponding portion.
Can also be omitted.

[0034]

In the temperature type expansion valve of the present invention, the diaphragm cover is provided with the mass body, so that the vibration of the diaphragm cover is suppressed, and the refrigerant passing noise can be reduced. The mass body has such a mass that vibration of the diaphragm cover can be suppressed, and it is not necessary to specify its shape and material.
Therefore, the cost of the mass itself can be made extremely low, and the weight is light, so that the cost increase and the weight increase of the thermal expansion valve can be suppressed as compared with the case of using the conventional soundproofing material. .

[Brief description of drawings]

FIG. 1 is a sectional view of a thermal expansion valve according to a first embodiment.

FIG. 2 is a perspective view of a mass body.

FIG. 3 is a refrigeration cycle diagram.

FIG. 4 is a graph showing an effect of reducing refrigerant passing sound.

FIG. 5 is a sectional view of a thermal expansion valve according to a second embodiment.

FIG. 6 is a sectional view of a thermal expansion valve according to a third embodiment.

FIG. 7 is a sectional view of a thermal expansion valve according to a fourth embodiment.

FIG. 8 is a cross-sectional view showing a connected state of mass bodies (fourth embodiment).

FIG. 9 is a cross-sectional view showing a connected state of mass bodies (fourth embodiment).

FIG. 10 is a cross-sectional view showing a joined state of mass bodies (fifth example).
Example).

FIG. 11 is a cross-sectional view showing a joined state of mass bodies (sixth embodiment).
Example).

FIG. 12 is a perspective view of a mass body (sixth embodiment).

FIG. 13 is a cross-sectional view showing a joined state of mass bodies (seventh example).
Example).

FIG. 14 is a plan view showing a joined state of mass bodies (seventh example).
Example).

FIG. 15 is a perspective view of a mass body (eighth embodiment).

FIG. 16 is a perspective view of a mass body (eighth embodiment).

FIG. 17 is a perspective view of a mass body (eighth embodiment).

[Explanation of symbols]

 1 Temperature Expansion Valve 5 Refrigerant Evaporator 9 Temperature Sensing Tube 10 Capillary Tube 12 Valve Housing 13 Diaphragm 18 Diaphragm Case 19 Diaphragm Cover 20 One Diaphragm Chamber 21 The Other Diaphragm Chamber 28 Mass Body

Claims (4)

[Claims] Claim: What is claimed is: 1. One diaphragm chamber is formed between a valve housing and a diaphragm case fixed to the valve housing, and the other diaphragm chamber is formed between the diaphragm cover and the one. And a diaphragm that is displaced according to the pressure difference between the other diaphragm chamber and the other diaphragm chamber, and by controlling the valve opening in conjunction with the displacement of this diaphragm, the gas refrigerant at the refrigerant evaporator outlet has a certain degree of superheat. In the thermal expansion valve for adjusting the refrigerant flow rate as described above, the diaphragm cover is provided with a mass body. 2. The temperature type expansion valve according to claim 1, wherein the outlet pipe of the refrigerant evaporator is provided so as to be in thermal contact with the outlet pipe of the refrigerant evaporator in response to a temperature change of the refrigerant. A temperature type expansion valve, comprising a temperature sensitive cylinder whose internal pressure changes, the temperature sensitive cylinder being provided in communication with the other diaphragm chamber via a capillary tube. 3. The thermal expansion valve according to claim 2, wherein the capillary tube is fixed to the diaphragm cover via the mass body. 4. The thermal expansion valve according to any one of claims 1 to 3, wherein the mass body is joined to a central portion of the diaphragm cover.