KR101613450B1 - Frozen ice thermal Jet-trim Expansion valve - Google Patents

Abstract

The present invention relates to an expansion valve of a turbo chiller. In the present invention, the refrigerant expansion and the refrigerant flow rate control are designed to be controlled by an electric motor drive controller (31)
The jet trim expansion valve used in the turbo chiller is equipped with a flange ball valve which is widely used in the conventional industry, and a first-stage jet trim (51) flow control device is mounted on the inner front side of the valve body of the ball valve, (R-134a) is passed through the condenser (outdoor unit) and the temperature is lowered by about 5 degrees. The refrigerant passes through the first stage jet trim (51) provided in the expansion valve, By maintaining the temperature of the gasified refrigerant (R-134a) at 3 degrees or less, the refrigeration capacity (RT) is maximized,
Stage pressure reduction by a second second stage jet trim 71 mounted on the ball opening 42 inside the ball 40 in the ball valve to provide a gasified refrigerant gas pressure of 2 bar By maintaining the temperature below -10 degrees Celsius, the compressor's minimum power (kW / RT) of the refrigerator is improved by improving the refrigeration capacity (RT)
It is developed to prevent the pressure fluctuation even if the opening range of the ball valve is increased or decreased from 9 (10%) to 90 (100%) due to increase of the cooling load of summer peak, It was invented so that the control range of the refrigerant gas of the ball valve can be varied from 9 degrees (10%) to 90 degrees (100%) depending on the increase in the cooling load requirement.
Therefore, the cooling capacity (RT) and the minimum power of the refrigerator (kW / RT) can be controlled by variously controlling the cooling flow rate related to the cooling area of the customer (destination) ), And 83% of the jet trim inflation valve compared to the existing technology (17%) was energy saving effect.

Description

[0001] The present invention relates to an ice-cooled refrigeration jet-trim expansion valve,

The present invention relates to an expansion valve of a turbo chiller, in which a first-stage jet trim (51) flow control device is mounted on the inner front side of an orifice area-controlled ball valve valve body, R-134a is passed through the condenser (outdoor unit) and the pressure is reduced to 3 bar or less while passing through the first stage jet trim 51 installed in the expansion valve by dropping the temperature by about 5 degrees. R-134a) The gas temperature is maintained at 3 degrees or less to maximize the freezing capacity (RT)

Stage pressure reduction by a second second stage jet trim 71 mounted on the ball opening 42 inside the ball 40 in the ball valve to provide a gasified refrigerant gas pressure of 2 bar By maintaining the temperature below -10 degrees Celsius, the compressor's minimum power (kW / RT) of the refrigerator is improved by improving the refrigeration capacity (RT)

It is developed to prevent the pressure fluctuation even if the opening range of the ball valve is increased or decreased from 9 (10%) to 90 (100%) due to increase of the cooling load of summer peak, It was invented so that the control range of the refrigerant gas of the ball valve can be varied from 9 degrees (10%) to 90 degrees (100%) depending on the increase in the cooling load requirement.

Referring to FIG. 10, a refrigerating cycle of a general turbo chiller is schematically illustrated. A superheated refrigerant gas compressed by a compressor and having a high temperature and a high pressure is heat-exchanged with cooling water while passing through a condenser of a cooling tower, Lt; / RTI >

At this time, the condensed low-temperature (about 30 to 35) high-pressure refrigerant is changed to low-temperature and low-pressure by the first stage jet trim 51 installed in the expansion valve and flows into the evaporator, And the superheated refrigerant gas formed at a high temperature and a high pressure continues to circulate again into the condenser, thereby forming a refrigeration cycle of the turbo refrigerator.

In the turbo chiller having the refrigeration cycle as described above, an expansion valve is provided for variably controlling the flow rate of the refrigerant in order to increase and decrease the refrigerator load. The expansion valve mainly adopted is a butterfly valve, a ball valve, Gate valves and the like are mainly used.

However, the conventional expansion valve used in the turbo refrigerator in the background art of the present invention uses a butterfly valve and a ball valve having the structure of Fig. 13, and the differential pressure method of the prior art adopts the orifice area control method As shown in FIG. 11, while the refrigerant flow rate in the valve according to the increase in the cooling load is increased from the intermediate degree 45 degrees (50%) to the upward degree 90 degrees (100%), the temperature and the flow rate are increased In addition, since the compressor operation time is increased and the power ratio is increased, the intermediate temperature is increased to 45 degrees (50%), ) Or less,

When the opening degree is below 25 degrees (28%), the rear end pressure and the cooling flow rate are drastically decreased, and the cooling capacity (RT) is decreased and the power required by the compressor (kW / RT) is increased.

Therefore, the existing ball valve and butterfly valve can be used in the range of low opening degree 25 degrees (28%) to less than 45 degrees (50%) when the refrigerant gas control range of the ball valve is increased And the like.

Accordingly, in the present invention, the jet trims 51, which are core technologies of our company, are installed inside the ball valve and at the inlet of the valve and inside the ball 40 to keep the pressure (temperature) constant at low pressure and low temperature, And to provide an expansion valve that increases the energy saving and refrigeration capacity by maintaining the constant pressure (temperature) by increasing and decreasing the refrigerant flow rate from the low-to-high opening degree of the valve opening.

In order to achieve the above object, the present invention provides an expansion valve for a turbo refrigerator, which is provided in a refrigerant line connecting a condenser and an evaporator in accordance with a request for improvement of energy saving and refrigeration capability of a turbo refrigerator, In order to solve the above-mentioned mechanical problem, the present invention can expect the best energy saving when the prior art registered with the patent is applied to the ice storage heat system by the globe control system of FIG. 12,

Also, the jet-trim ball control expansion valve of FIG. 11 is used in the valve body 37 so as to be used at 1000RT or less in terms of economics in accordance with a request for improvement of energy saving and refrigeration capability of the turbo chiller. The pressure (temperature) is kept constant at a low pressure and a low temperature by mounting the jet trim 51 in the inlet of the valve and the inside of the ball 40, and the valve opening is changed from low to high according to the capacity of the cooling load, The expansion valve is provided to increase the energy saving and refrigeration capacity by maintaining the constant pressure (temperature).

Another object of the present invention is to provide an expansion valve capable of achieving stability of valve operation by the jet flow control device of the present invention with respect to the pressure fluctuation of the high-pressure refrigerant.

In the present invention, the expansion valve controlled flow rate by mechanical and electrical mechanisms maintains the expansion of the refrigerant by keeping the pressure (temperature) constant by the jet trim mounted in the valve and controls the flow rate of the refrigerant according to the opening rate of the ball This is achieved by increasing the refrigeration capacity by reducing the consumption power of the compressor compared to the conventional expansion valve employed in the turbo chiller and by developing an expansion valve for energy saving by absorbing the cooling thief, I was able to contribute.

In addition, without additional maintenance, the jet trim expansion valve can be used permanently and furthermore, it can prevent the damage and deterioration of the turbo chiller due to malfunction or malfunction.

1 is a perspective view of an ice storage heat refrigeration jet trim expansion valve according to Embodiment 1 of the present invention,
Fig. 2 is a cross-sectional perspective view of the valve body 37 of the motor drive controller 31 of Fig. 1,
3 shows a state in which the first end jet trim 51 and the second end jet trim 71 are installed in the valve body 37 and the direction of the ball opening 42 is opened by 90 degrees (100%). (37)
4 shows a valve 60 in which the first stage jet trim 51 and the second stage jet trim 71 are installed in the valve body 37 and the direction of the ball opening 42 is opened by 45 degrees (50% An enlarged cross-sectional view of the main body 37,
5 shows a state in which the first end jet trim 51 and the second end jet trim 71 are installed in the valve body 37 and the direction of the ball opening 42 is closed at 0 degree (0%). (37)
6 is a perspective view showing the completion of the first end jet trim 51,
7 is an enlarged sectional view showing that the deceleration passage 54 of FIG. 6 is formed,
8 is a right side view showing an arrangement state of the slot and slot of the first speed reduction plate 52 in Fig. 6,
Fig. 9 is a right side view of the arrangement of the holes of the second speed reduction plate 53 of Fig. 6,
10 is an explanatory view for explaining the operating conditions and performance of the expansion valve according to the second embodiment of the present invention,
11 is an explanatory view showing the performance according to the existing technology and the operating condition of the expansion valve according to the opening degree of the present invention,
12 is a cross-sectional view illustrating the structure of the globally expanding valve 10 of our core technology,
13 is a sectional view showing a state in which the opening direction of the butterfly in the butterfly valve of the conventional technique is opened by 50 percent (45 degrees) of the degree of mediation.

The present invention has the following means in order to achieve the above object.

That is, the expansion valve of the present invention includes a valve body 37, a jet trim flow control device provided in the valve body, and a motor drive controller 31 for controlling the flow rate of the balls and balls And,

Characterized in that the ball is driven by a motor drive controller (31) mounted on the valve body (37).

Hereinafter, a preferred embodiment of a jet trim expansion valve for a turbo refrigerator according to the present invention will be described in detail with reference to the accompanying drawings.

(Example 1)

1 is a perspective view of an ice storage heat refrigeration jet trim expansion valve according to Embodiment 1 of the present invention,

2 is a cross-sectional cutaway perspective view of the valve body 37 in the motor drive controller 31 of Fig.

3 shows a state in which the first end jet trim 51 and the second end jet trim 71 are installed in the valve body 37 and the direction of the ball opening 42 is opened by 90 degrees (100%). (37), and Fig.

4 shows a valve 60 in which the first stage jet trim 51 and the second stage jet trim 71 are installed in the valve body 37 and the direction of the ball opening 42 is opened by 45 degrees (50% An enlarged cross-sectional view of the main body 37,

5 shows a state in which the first end jet trim 51 and the second end jet trim 71 are installed in the valve body 37 and the direction of the ball opening 42 is closed at 0 degree (0%). (37).

6 is a perspective view showing the completion of the first end jet trim 51,

FIG. 7 shows an enlarged cross-sectional view showing that the deceleration passage 54 of FIG. 6 is formed,

8 is a right side view showing the arrangement of the holes and slot grooves of the first speed reduction plate 52 of Fig. 6,

9 is a right side view showing the arrangement of the holes of the second speed reduction shoe plate 53 of Fig.

That is, the expansion valve of the present invention described in claim 1 is characterized in that the valve body 37 and the valve body 37 are divided into a first valve body 35 and a second valve body 36, A first sealing member seal (38) is mounted within the valve body (35) to form a primary seal when the valve is closed and a ball (40) mounted on the right side of the first sealing seal seal seal A valve body 35 is formed,

A second sealing member shaft 39 is mounted on the second valve body 36 so that the first valve body 35 and the second valve body 36 are coupled by the body bolt 34, So that the fluid passage is formed integrally with the valve body 37 so that the fluid passage passes through the first passage 43 corresponding to the refrigerant inlet port and the second passage 44 and the ball opening portion 42 to pass through the third passage 45 ), And the refrigerant fluid

The ball 40 is provided with a ball slot groove 41 and a rotary shaft 33 inserted into the ball slot groove 41 to transmit power and the rotary shaft 33 are formed upward, The motor drive controller 31 connected to the motor drive controller 31 is controlled in proportion to the direction from 0 to 90 degrees so that the ball 40 regulates the amount of opening and closing of the refrigerant by the control signal (pressure set value or temperature set value) Control,

The first end jet trim 51 is mounted on the first passage 43 in the valve body 37 corresponding to the refrigerant inlet port of the valve body 37 to form the one-stage reduction flow passage, The refrigerant gas in the high-temperature and high-pressure liquid state passes through the first end-of-jet trim 51 and is depressurized by one step, so that the refrigerant gas is gasified to maintain the zero degree,

The second stage jet trim (71) is mounted at the inlet of the ball opening (42) built in the valve body (37) to form a two-stage reduction flow passage, whereby the refrigerant gas of the first- Is an ice storage heat storage expansion valve (21) that maintains the refrigerant gas at -15 degrees to increase the refrigerating capacity and reduce the operation time of the compressor to save energy.

In the expansion valve according to the second aspect of the present invention, the first end jet trim (51) and the second end jet trim (71) are provided with a plurality of punched holes (56) in a first speed sensing plate (52) The middle hole (57) and the small hole (58) are provided, and in the connection hole corresponding to the positions of the bore hole (56), the middle hole (57) and the small hole (58) And a small slot groove (61) to form a deceleration flow path (54).

In the expansion valve of the present invention according to claim 3 of the present invention, the first end jet trim (51) and the second end jet trim (71) are connected to the second slot (53) A plurality of bore holes 56 and a middle hole 57 and a small hole 58 are formed at the positions of the connection holes of the middle slot groove 60 and the small slot groove 61 to form the deceleration flow channel 54. [ Is an ice storage heat expansion valve (21).

The expansion valve of the present invention as set forth in claim 4 is characterized in that the argon welding is applied to the welding face portion (55) of the first speed sensing plate (52) and the second speed sensing plate (53) Wherein the jet trim (51) and the second stage jet trim (71) are formed.

Next, the assembling procedure of the expansion valve of the present invention will be described.

A first end trim trim 51 is mounted on the left side of the inside of the first valve body 35 and an end is attached to the ball opening 42 of the ball 40 after mounting the first sealing non- After the ball 40 is inserted after the second-stage jet trim 71 is inserted, the rotation shaft 33 is inserted into the upper end of the ball slot groove 41 to be brought into close contact with the first valve body 35.

After the second sealing member shaft 39 is inserted into the second valve body 36, the valve body 37 is assembled with the body bolt 34 after the valve body 35 is engaged with the first valve body 35, The drive controller 31 is seated to complete the jet trim expansion valve.

(Example 2)

Next, Embodiment 2 will be described with reference to Figs. 10 to 13. Fig.

10 is an explanatory view for explaining the operating conditions and performance of the expansion valve according to the second embodiment of the present invention.

FIG. 11 is an explanatory view showing the performance according to the existing technology and the operating condition of the expansion valve according to the opening degree of the present invention,

12 is a cross-sectional view illustrating the structure of the globally expanding valve 10 of our core technology.

13 is a cross-sectional view showing a state in which the opening direction of the butterfly in the butterfly valve of the conventional technique is opened by 50 percent (45 degrees) of the median degree.

To understand the second embodiment, the principle of the refrigerator cycle will be explained.

When the refrigerant gas, which has been heat exchanged in the evaporator, is compressed by the compressor, the temperature rises as the liquid becomes liquid. When the liquid refrigerant with a raised temperature is cooled by a condenser cooling pen (in the case of a large scale, it is cooled with water from a cooling tower) and then sent to the expansion valve, liquid refrigerant is gasified from the expansion valve, The gas contacts the outside air from the evaporator and absorbs the heat, which lowers the temperature of the outside air. Continuously repeating this process is the principle of the refrigerator cycle

The functions of the refrigeration cycle apparatus will be described to facilitate understanding of the second embodiment.

1. Compressor: A device that compresses liquid refrigerant into a liquid state.

2. Condenser cooling pen, cooling tower (Cooling fan): a device to cool compressed high-temperature liquid refrigerant.

3. Expansion Valve (Expansion Valve): A device that changes the liquid refrigerant into gas. (It is the same principle as the nozzle part of spray mosquito)

4. Evaporator: The function of evaporator is to make heat exchange by making contact with low temperature refrigerant gas in evaporator and outside air circulated by ventilating pen.

The function of the expansion valve will be described in order to facilitate understanding of the second embodiment.

The expansion valve is the most basic refrigerant flow controller in the freezer

When the refrigerant liquid passes through the expansion valve orifice, the pressure drops and a part of the refrigerant liquid evaporates, so that the temperature is drastically lowered and the volume is significantly increased.

As the refrigerant passes through the expansion valve, it receives a thermal expansion without heat exchange due to the throttling action. Therefore, the refrigerant has no change in enthalpy before and after the expansion valve, and the pressure is remarkably lowered and the temperature is lowered.

The expansion valve used in the turbo chiller uses an orifice type butterfly valve and ball valve, and the load operation for controlling the refrigerant circulation forms an optimal circulation cycle at 25 to 100%.

If the valve opening degree of the expansion valve is excessively increased, the low pressure rises, the evaporation temperature rises, and the compressor may be damaged by the liquid hammer.

When the expansion valve is opened too little, the low pressure is lowered, the suction gas is overheated, the inside temperature rises, the discharge temperature rises, the refrigerator oil deteriorates, the refrigerating capacity is reduced, and the power required for the refrigerator is increased.

The expansion valve should be installed as close to the evaporator as possible.

If the amount of refrigerant supplied to the evaporator is excessive or repeated, hunting of the expansion valve occurs and the pressure and temperature of the refrigerant continuously fluctuate.

To facilitate the understanding of the second embodiment, the development of the turbo chiller (R-134a refrigerant) expansion valve will be described.

The price of refrigerant is rising every year due to regulations on use of R-22 refrigerant. The production volume is expected to be frozen from 2016 and is expected to be fully discharged in 2030.

R-134a refrigerants used in turbo chillers are not regulated as alternative refrigerants and demand is expected to surge.

The compression principle of the turbo chiller is compressed by changing the velocity energy of the refrigerant gas generated by the centrifugal force due to the centrifugal force of the impeller to pressure energy. The applied capacity is 250 ~ 1,000RT for industrial, air conditioning and ice storage capacity. Capacity control is possible, partial load characteristics are good, and Surging may occur when partial load operation is less than 25%.

The durability of the turbo chiller is relatively long, 15 ~ 20 years, less noise than 83 ~ 87dB, and the power consumption is 560kW based on 1000RT.

Although the present invention has been fully described by way of example with reference to the accompanying drawings, it is to be understood that the invention may be embodied in many other specific forms without departing from the spirit or scope of the invention.

DESCRIPTION OF THE REFERENCE NUMERALS
1: Globe type Balancing Plug
2: Valve seat-ring
3: Seat-ring Gasket
4: Bonnet Gasket
5: Packing Box
6: Bonnet Assembly
7: Globe valve body (Body)
9: Jet trim flow control valve
10: Globe expansion valve
11: Butterfly
12: Butterfly valve body
13: Butterfly expansion valve
21: Ice-cooled refrigeration jet trim expansion valve
31: Motor drive controller
32: Emergency handle
33:
34: Body bolt
35: first valve body
36: second valve body
37: valve body
38: a first sealing member
39: second sealing non-working case
40: view
41: Ball slot groove
42: Ball opening
43: first passage
44: second passage
45: third passage
51: First-stage jet trim (flow control device)
52: First speed reduction plate
53: second speed sense plate
54: Deceleration flow path (with jet oil)
55: welding face mounting
56: Large hole
57: middle hole
58: Small hole
59: Large slot home
60: middle slot home
61: Small slot home
71: Second-stage jet trim (flow control device)

Claims (4)

The valve body 37 and the valve body 37 are divided into a first valve body 35 and a second valve body 36. The first valve body 35 includes a first valve body 35, 38 are mounted to form a primary hermetic seal when the valve is closed and a ball 40 is mounted on the right side of the first sealing member shaft 38 to form the first valve body 35,
A second sealing member shaft 39 is mounted on the second valve body 36 so that the first valve body 35 and the second valve body 36 are coupled by the body bolt 34, So that the fluid passage is formed integrally with the valve body 37 so that the fluid passage passes through the first passage 43 corresponding to the refrigerant inlet port and the second passage 44 and the ball opening portion 42 to pass through the third passage 45 ), And the refrigerant fluid

The ball 40 is provided with a ball slot groove 41 and a rotary shaft 33 inserted into the ball slot groove 41 to transmit power and the rotary shaft 33 are formed upward, The motor drive controller 31 connected to the motor drive controller 31 is controlled in proportion to the direction from 0 to 90 degrees so that the ball 40 regulates the amount of opening and closing of the refrigerant by the control signal (pressure set value or temperature set value) Control,

The first end jet trim 51 is mounted on the first passage 43 in the valve body 37 corresponding to the refrigerant inlet port of the valve body 37 to form the one-stage reduction flow passage, The refrigerant gas in the high-temperature and high-pressure liquid state passes through the first end-of-jet trim 51 and is depressurized by one step, so that the refrigerant gas is gasified to maintain the zero degree,
The second stage jet trim (71) is mounted at the inlet of the ball opening (42) built in the valve body (37) to form a two-stage reduction flow passage, whereby the refrigerant gas of the first- Cooled refrigeration jet trimming expansion valve (21) that maintains the refrigerant gas at -15 degrees to increase the refrigeration capacity and reduce the compressor operation time to save energy.
The method according to claim 1,
The first end jet trim 51 and the second end jet trim 71 are provided with a plurality of bosses 56 and a middle hole 57 and a small hole 58 in a first speed- And has a slot groove 59, a middle slot groove 60 and a small slot groove 61 in a connection hole corresponding to the position of the hole 56, the middle hole 57 and the small hole 58 To form a deceleration flow path (54).
3. The method of claim 2,
The first end jet trim 51 and the second end jet trim 71 are coupled to the second speed reduction plate 53 having a variable thickness by the large slot groove 59, the middle slot groove 60, Wherein a plurality of hole holes (56), a middle hole (57), and a small hole (58) are provided at a connection hole position of the ice storage tank (61) to form a deceleration flow path (54).
4. The method according to claim 2 or 3,
Welding is performed on the welding surface 55 of the first speed sensitive plate 52 and the second speed sensitive plate 53 on which the deceleration flow path 54 is formed by the argon welding to form the first end jet trim 51 and the second end jet 53, And a trim (71) is formed.

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