KR100330008B1 - Flow rate regulating valve - Google Patents

Abstract

PURPOSE: A flow rate regulating valve is provided to improve the performance by lowering pressure of liquid refrigerant and regulating the flow rate in multiple stages without use of thermal expansion fluid or diaphragm, and to increase the endurance by using the mechanical method. CONSTITUTION: A flow rate regulating valve has a valve housing(21) having an inlet(21a), an outlet(21b) and a guide space(21c) connected to the inlet and the outlet; a spool(22) combined with the guide space of the valve housing with moving up and down to adjust the opening degree of the outlet; an elastic support unit supporting the spool elastically; a liquid refrigerant guide unit connecting the inlet and the guide space to decrease pressure of liquid refrigerant; and a driving unit moving up and down the spool. Performance and endurance are improved with reducing pressure of liquid refrigerant and regulating flow rate without thermal expansion liquid or diaphragm.

Description

Flow control valve

The present invention relates to a flow control valve applied to a refrigeration cycle, and more particularly, by eliminating the use of thermal expansion liquid and a diaphragm, it is possible to further improve the pressure drop and flow control performance of the liquid refrigerant, and contribute to the improvement of durability. To a flow regulating valve.

Generally, a refrigeration cycle is basically composed of an evaporator, a compressor, a condenser and an expansion valve to reduce the ambient temperature while evaporating, compressing, condensing and expanding the refrigerant. Perform the function.

In more detail, the liquefied refrigerant inside the evaporator is evaporated by evaporation. At this time, the refrigerant liquid deprives the latent heat of evaporation necessary for evaporation from the air around the cooling tube and continues to evaporate itself. The air deprived of heat is cooled to lower the temperature, and the air keeps the inside of the inside at low temperature by natural convection or a blowing fan. In the evaporator, the refrigerant liquid supplied from the expansion valve and the evaporated refrigerant vapor coexist, and a change from liquid to steam proceeds, and a constant relationship is established between the evaporation pressure and the evaporation temperature during this state change. .

The refrigerant vapor vaporized in the evaporator is sucked into the compressor. This action is intended to keep the refrigerant pressure inside the evaporator low so that the liquid refrigerant can continue to evaporate vigorously even under low temperature conditions. In addition, the refrigerant vapor sucked into the compressor is compressed by the piston inside the cylinder, and the pressure is increased, so that the refrigerant vapor can be easily liquefied even when cooled by cooling water or cooling air at room temperature.

Thereafter, the compressed gas exiting the compressor is cooled by the condenser to liquefy condensation. In the case of such a condensation action, as in the case of evaporation, the refrigerant is in a state where the vapor and the liquid coexist, and a constant relationship is established between the condensation pressure and the condensation temperature while changing from gas to liquid.

The action of lowering the pressure to a state that is easy to evaporate before the refrigerant liquefied by the condenser is called expansion is referred to as expansion, and the expansion valve acts as a depressurizing action and performs flow rate control of the refrigerant liquid. In other words, the amount of refrigerant evaporating inside the evaporator is determined according to the amount of heat to be removed in the furnace under a predetermined evaporation temperature (evaporation pressure). to be.

In other words, the expansion valve functions as a flow control valve for thermally expanding and expanding the high-temperature and high-pressure liquid refrigerant to a low-temperature low-pressure state by the throttling action, and at the same time, maintaining a proper refrigerant supply amount according to the load of the evaporator.

The expansion valve is known in various forms according to the operation method and structure, and in recent years, a thermopneumatic flow control valve is known that has a high driving force, fine driving, and reduced manufacturing cost, Exemplary embodiments will be described with reference to the accompanying drawings.

As shown in FIG. 1, a cap 1 having a predetermined shape, a heating element bottom plate 3 made of ceramic material having an expansion liquid inlet 2 formed on both sides thereof, and a Ta-Al heating electrode in a middle portion thereof. (4) is provided and is fixed to the upper surface of the heating element base plate 3 and the Al electrode 5, and the outer peripheral portion of the upper surface of the Al electrode 5 via a spacer (6) for example And a diaphragm 7 formed of a Cu material, interposed between an upper surface of the Al electrode 5 and a lower surface of the spacer 6, and an upper surface of the spacer 6 and a lower surface of the diaphragm 7 to improve adhesive strength. An adhesive layer (also referred to as a filler) (8) (9), a thermal expansion liquid (10) filled in a space formed between the Al electrode (5) and the diaphragm (7), and the heating element base plate (3). The bottom plate 11 is fixed to the bottom surface of the suture for closing the expansion liquid inlet (2).

Reference numeral 12 in the figure shows a power line.

The cap 1 has a predetermined space portion 1a through which the liquid refrigerant passes, and an inlet port 1b for introducing the liquid refrigerant and an outlet port 1c for discharging the refrigerant on both sides of the upper portion. It is formed so that 1a may pass.

In constructing the thermopneumatic flow control valve as described above, the Al electrode 5 having the Ta-Al heating electrode 4 is first fixed to the upper surface of the bottom plate 3 of the heating element, and the Al electrode 5 is The lower bonding layer 8, the spacer 6, the upper bonding layer 9, and the diaphragm 7 are sequentially bonded and fixed on the upper surface, and the inside of the Al electrode 5, the spacer 6, and the diaphragm 7 is fixed. The predetermined space is formed in the.

Thereafter, the thermal expansion liquid 10 is injected from the lower side of the heating element bottom plate 3 through the expansion liquid inlet 2, and the sealing bottom plate 11 is attached and fixed to the lower surface of the heating element bottom plate 3 to expand the expansion liquid. After the injection port 2 is sealed, the sealing bottom plate 11 is attached and fixed to the bottom of the cap 1, and the power supply line 12 of the Al electrode 5 is led out to the outside of the cap 1.

At this time, the central portion of the diaphragm 7 is located directly under the discharge port 1c formed in the cap (1).

In the conventional flow control valve as described above, the liquid refrigerant flows in through the inlet 1b of the cap 1, passes through the space 1a formed therein, and then through the outlet 1c. When the flow rate of the liquid refrigerant needs to be adjusted when it is discharged to the evaporator, when the power is applied to the Al electrode 5 through the power line 12 drawn out of the cap 1, the Al electrode 5 The Ta-Al heating electrode 4 emits heat, so that the thermal expansion liquid 10 filled in the Al electrode 5 and a predetermined space formed inside the spacer 6 and the diaphragm 7 is formed. As shown in FIG. 2, the intermediate portion of the diaphragm 7 swells toward the discharge port 1c of the cap 1 by the thermal expansion action of the thermal expansion liquid 10, and accordingly the discharge port 1c. By controlling the amount of liquid refrigerant discharged to) to control the overall amount of fluid.

However, in the thermopneumatic flow control valve according to the related art as described above, the thermal expansion liquid 10 is used as a method of adjusting the flow rate by expanding the thermal expansion liquid 10 by applying heat to the Ta-Al heating electrode 4. Sealing is not easy to completely prevent leakage, and durability of the diaphragm 7 due to repeated expansion and contraction of the thermal expansion liquid 10 is not good, and reliability of the flow control valve is improved. There was a disadvantage in that it lowers, and acts as a shortening factor for the overall life.

The main object of the present invention is to provide a flow control valve that can further improve the pressure drop and flow control performance by eliminating the use of thermal expansion liquid and diaphragm.

Another object of the present invention is to provide a flow control valve that can extend the overall life by further improving durability by eliminating the use of thermal expansion liquid, a diaphragm, and the like.

1 and 2 show the configuration and operation of the flow control valve according to the prior art,

1 is a cross-sectional view showing a state in which the thermal expansion liquid does not expand.

2 is a cross-sectional view showing a state in which the thermal expansion liquid is expanded and the diaphragm swells.

Figure 3 is a cross-sectional view showing an embodiment of a flow control valve according to the present invention.

Figure 4 is a perspective view of the liquid refrigerant guide means according to an embodiment of the present invention.

5 is a cross-sectional view showing another embodiment of a flow control valve according to the present invention.

Figure 6 is a perspective view of the liquid refrigerant guide means according to another embodiment of the present invention.

Figure 7 is a sectional view showing another embodiment of a flow control valve according to the present invention.

<Explanation of symbols for the main parts of the drawings>

21; Valve housing 21a; Inlet

21b; Outlet 21c; Information space

22; Spool 23; Compression Coil Spring

24; Bellows 30,30 '; Liquid refrigerant guide pipe

31; Through-hole 32; Suction hole

33; Discharge holes 34; Extension

40; Brakit 41; motor

70; Porous media

As an embodiment for achieving the object of the present invention, the inlet and outlet are formed on both sides and the valve housing is formed with a guide space communicating with the inlet and outlet therein, coupled to the lifting and lowering of the guide space of the valve housing And a spool for controlling the opening degree of the outlet, a gripping means accommodated in the upper portion of the guide space to elastically support the spool, and connected through the inlet and the guide space to smooth the pressure drop of the liquid refrigerant. It is provided with a flow rate control valve comprising a liquid refrigerant guide means and a drive means for raising and lowering the spool.

The liquid refrigerant guide means is a liquid refrigerant guide pipe that is formed in the through-hole for the flow of the liquid refrigerant therein, the upper and lower portions of the suction hole and the discharge hole is formed to connect through the inlet and the guide space It features.

According to one embodiment of the liquid refrigerant guide pipe, the entire diameter is formed to be the same.

According to another embodiment of the liquid refrigerant guide pipe, the expansion portion having a larger diameter than the upper portion is formed in the lower portion, and is formed on the upper surface of the spool to form a protruding rod for adjusting the opening degree of the liquid refrigerant flow path is inserted into the expansion portion do.

In addition, as another embodiment for achieving the object of the present invention, the inlet and outlet are formed on both sides and the valve housing is formed with a guide space communicating with the inlet and outlet therein, coupled to the lifting and lowering of the guide space of the valve housing And a spool for adjusting the opening degree of the outlet, a porous medium filled in the upper portion of the guide space and elastically deformed by the spool to perform flow rate control and pressure drop, and driving means for raising and lowering the spool. Configure.

Hereinafter, the flow control valve of the present invention will be described with reference to the embodiments shown in the accompanying drawings.

3 is a cross-sectional view showing an embodiment of a flow control valve according to the present invention, Figure 4 is a perspective view of a liquid refrigerant guide according to an embodiment of the present invention.

As shown in the drawing, in the flow rate control valve according to the exemplary embodiment of the present invention, the inlet 21a and the outlet 21b are formed at both sides, and the guide space 21c communicating with the inlet 21a and the outlet 21b therein. ) Is formed in the valve housing 21, the spool (22) coupled to the lifting and lowering in the guide space (21c) of the valve housing 21 to adjust the opening degree of the outlet (21b), and the guide Liquid which is accommodated in the upper portion of the space 21c to elastically support the spool 22 and connected through the inlet 21a and the guide space 21c to facilitate the pressure drop of the liquid refrigerant And a coolant guiding means and driving means for raising and lowering the spool 22.

The inlet 21a and the guide space 21c are formed on the same line as the valve housing 21, and the outlet 21b is formed at right angles to the guide space 21c, and the inlet 21a and At the inner end of the outlet 21b, the inlet hole 21a 'and the outlet hole 21b' are formed to communicate with the guide space 21c.

Referring to one embodiment of the liquid refrigerant guide means, a liquid refrigerant guide pipe 30 having a through-hole 31 for the flow of liquid refrigerant therein, the liquid refrigerant guide pipe 30 of the inlet (21a) It is inserted and fixed in the inlet hole 21a '.

The upper and lower ends of the liquid refrigerant guide pipe 30 protrude by a predetermined length in the direction of the inlet 21a and the guide space 21c, respectively, and several suction holes 32 and discharge holes 33 on the outer circumferential surface thereof. It is formed to communicate with this through hole 31.

The liquid refrigerant guide pipe 30 is preferably formed to have a length protruding in the direction of the guide space (21c) longer than the length protruding in the direction of the inlet (21a), the number of discharge holes 33 also suction holes It is formed to be larger than the number of (32).

In addition, the gripping means preferably uses a compression coil spring 23, and an upper end of the compression coil spring 23 is supported by a stepped portion 21d formed in the guide space 21c, and a lower end thereof is a spool 22. It is supported on the upper periphery of the spool 22 to always support the elastic downward.

Bellows 24 having excellent seal performance and good elasticity in the Y-axis direction are coupled to the lower portion of the valve housing 21, and the bellows 24 surrounds the lower end of the spool 22.

In the coupling of the bellows 24 to the lower portion of the valve housing 21, it is preferable that the high pressure is applied at the upper portion of the valve housing 21, but the high pressure is not applied at the lower portion, so that the bellows 24 is bonded and fixed with an epoxy bond.

Meanwhile, referring to one embodiment of the driving means, a brakit 40 fixed to a lower part of the valve housing 21 by a conventional fixing means, and a fixing bolt or the like on one side of the upper surface of the bracket 40, A motor 41 having a rotary shaft 41a which is fixed by a phosphorus fixing means and protrudes downward through the bracket 40, and a first gear 51 fixed to the rotary shaft 41a of the motor 41. And a second gear 52 and a third gear 53 rotatably coupled to the support shafts 42 and 43 fixed to both sides of the bracket 40, and the third gear 53. The cam disc 54 is formed integrally with the lower surface of the bellows 24 in contact with a predetermined portion of the outer circumferential surface.

The first gear 51 is formed of a worm, the second gear 52 is formed integrally with the air gear 52a and the small gear 52b having different diameters, and the third The gear 53 is formed of a spur gear, and the first gear 51 is always engaged with the worm wheel, that is, the standby gear 52a of the second gear 52, and the second gear ( The small gear 52b of 52 is always in engagement with the third gear 53.

The cam disc 54 integrally formed with the third gear 53 is formed with the shortest diameter portion 54a having the smallest radius and the longest diameter portion 54b having the largest radius, The spool 22 in contact with the outer circumferential surface is capable of lifting and lowering operation due to a radius difference.

At least one of the outer circumferential surface of the cam disc 54 and the lower surface of the bellows 24 in contact with the outer circumferential surface thereof preferably forms a MoS ₂ coating layer in order to reduce the friction coefficient of each other.

The motor 41 which is the power generating means applied to the drive means may use either a step motor or a DC motor.

The driving means as described above will further include a cam position detecting means for detecting the position of the cam disc 54, a detailed description thereof will be omitted.

In addition, the driving means is not limited to the embodiment shown in the drawings, and may be any configuration that effectively raises and lowers the spool 22 using the rotational force of the motor 41.

Referring to the operation of the flow control valve according to the present invention configured as described in more detail as follows.

As shown in FIG. 3, when power is applied to the motor 41, the rotating shaft 41a rotates according to the step amount of the motor 41, and the power of the rotating shaft 41a is controlled by the first gear ( 51) → the standby gear 52a → the second gear 52b → the third gear 53 of the second gear 52, the third gear 53 is rotated by a predetermined angle as the third gear 53 The cam disc 54 formed integrally with the gear 53 also rotates integrally.

Therefore, due to the difference in radius between the short diameter portion 54a of the cam disc 54 and the long diameter portion 54b, the spool 22 is raised or lowered to open the discharge hole 21b 'formed in the valve housing 21. By adjusting the degree it is possible to control the amount of liquid refrigerant.

At this time, since the liquid refrigerant guide pipe 30 having a predetermined length is inserted and fixed in the inlet hole 21a 'formed in the inlet port 21a of the valve housing 21, the high pressure flows into the inlet port 21a. The liquid refrigerant is sucked into the through hole 31 and the suction hole 32 formed on the outer circumferential surface of the liquid refrigerant guide pipe 30 and flows downward, and a plurality of discharge holes 33 formed in the lower portion of the liquid refrigerant guide pipe 30 are provided. And discharged into the guide space 21c, and then discharged into the discharge hole 21b 'whose opening degree is controlled by the spool 22, thereby controlling the pressure of the liquid refrigerant.

On the other hand, Figure 5 and 6 shows another embodiment of the present invention, by slightly modifying the shape of the liquid refrigerant guide pipe (30 '), to form an expansion portion 34 having a larger diameter than the upper portion, The discharge part 33 'is formed in the expansion part 34, and is comprised.

At this time, it is preferable to form a protruding rod 22a inserted into the expansion part 34 on the upper surface of the spool 22 to adjust the opening degree of the liquid refrigerant flow path.

The upper end of the protruding rod 22a has a triangular pyramid or hemispherical shape.

According to another embodiment of the present invention as described above, it is possible to adjust the opening degree of the flow path of the liquid refrigerant guide pipe 30 'by the protruding rod 22a of the spool 22 in multiple stages, thereby controlling the flow rate and the pressure drop. Multi-level adjustment is possible.

In addition, Figure 7 shows another embodiment of the flow control valve according to the present invention, the inlet (21a) and outlet 21b is formed on both sides and the guide space communicating with the inlet (21a) and outlet 21b therein A valve housing 21 having a 21c formed therein, a spool 22 coupled to the guide space 21c of the valve housing 21 so as to be lifted and lowered, and adjusting the opening degree of the outlet 21b; Filled in the upper portion of the guide space (21c) and elastically deformed by the spool 22 while performing a flow control and pressure drop action (porus media) 70 and for raising and lowering the spool 22 It includes a drive means.

In the drawings, the same reference numerals are given to the same parts as the configurations of the present invention.

According to another embodiment of the present invention as described above, as in the embodiment of the present invention, when the spool 22 is raised by the driving means to apply a predetermined compressive force to the porous medium 70, the porous medium 70 Since the voids formed therein are reduced to control the fluidity, the flow rate of the liquid refrigerant discharged to the discharge hole 21b 'of the valve housing 21 and the pressure drop action are enabled.

As described above, the flow control valve according to the present invention is coupled to the valve housing formed in the inlet and outlet on both sides and the guide space communicating with the inlet and outlet therein, and to be able to move up and down in the guide space of the valve housing And a spool for controlling the opening degree of the outlet, a gripping means accommodated in the upper portion of the guide space to elastically support the spool, and connected through the inlet and the guide space to smooth the pressure drop of the liquid refrigerant. By including liquid refrigerant guide means and driving means for raising and lowering the spool, the use of thermal expansion liquid and diaphragm is eliminated, thereby further improving the pressure drop and flow rate regulating performance of the liquid refrigerant, and contributing to the improvement of durability. It has an effect such as.

Claims (4)

A valve housing having both inlets and outlets formed on both sides thereof, and guide spaces communicating with the inlets and outlets therein; A spool coupled to the guide space of the valve housing to move up and down to adjust an opening degree of the outlet; And gripping means housed in an upper portion of the guide space to elastically support the spool; Liquid refrigerant guide means for connecting the inlet and the guide space to facilitate the pressure drop of the liquid refrigerant; And a driving means for raising and lowering the spool. According to claim 1, The liquid refrigerant guide means is formed through the through-hole for the flow of the liquid refrigerant there are a plurality of suction and discharge holes are formed in the upper, lower communication with the through hole to connect through the inlet and the guide space A flow rate control valve, which is a liquid refrigerant guide pipe. According to claim 1, wherein the liquid refrigerant guide pipe is formed in the lower portion having a larger diameter than the upper portion, and inserted into the expansion portion on the upper surface of the spool is formed with a protrusion bar for adjusting the opening degree of the liquid refrigerant flow path To flow control valve. A valve housing having an inlet and an outlet formed at both sides thereof, and a guide space therein for communicating with the inlet and the outlet; A spool coupled to the guide space of the valve housing to move up and down to adjust an opening degree of the outlet; A porous medium filled in the upper portion of the guide space and elastically deformed by the spool to perform flow control and pressure drop; And a driving means for raising and lowering the spool.