JP2001141336A - Motor expansion valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a motor expansion valve in refrigeration cycle for controlling the flow rate of refrigerant by delivering a specified pulse signal to a coil 4 secured to the outer circumference of a case 1 thereby driving a spindle pin 2 provided in the core of the case 1 that the degree of freedom of piping is low, the structure is intricate, assembling workability is low when a high assembling accuracy is required, and the manufacturing cost is high. SOLUTION: A valve body 10 having a throttle section 12 engaging with the forward end part of a spindle pin 2 at a lower position of a flow through space 11 for containing the lower half section of the spindle pin 2 is provided integrally on the lower surface of a case 1 to form an expansion valve body. An externally threaded part 15 is formed on the outer circumferential surface of the valve body 10 and an internally threaded part 25 mating with the externally threaded part 15 is formed on the inner circumferential surface of a body 20 having a recess 21 interconnecting refrigerant inlet and outlet holes 22, 23 and then the valve body 10 is screwed into the recess 21 of the body 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric expansion valve for piping a refrigerant cycle of an air conditioner or the like to adjust a flow rate and a reduced pressure of the refrigerant.

[0002]

2. Description of the Related Art In a refrigerant circuit of an air conditioner, a compressor,
2. Description of the Related Art During a refrigeration cycle in which a condenser and an evaporator are connected, a motor-driven electric expansion valve is used to control the flow rate and reduced pressure of a refrigerant to predetermined values. This electric expansion valve is provided with a spindle pin integrally formed with a motor rotor at a shaft center of a cylindrical case, a tip formed in a conical shape with a tapered tip, a stator coil fixed to an outer periphery of the case, and a refrigerant formed in a body. In the refrigerant passage from the inflow port to the outflow port, an orifice-shaped throttle portion with which the tip of the spindle pin engages is formed. Then, by outputting a predetermined pulse signal to the coil, the spindle pin is driven up and down in conjunction with the rotation of the motor rotor, and from top dead center (fully open) to bottom dead center (fully closed).
In this range, the flow rate of the refrigerant is adjusted by controlling the clearance between the tip of the spindle pin and the throttle.

[0003]

In such an electric expansion valve, a valve drive section, a flow rate adjustment mechanism section, and a body are integrally assembled, and this is piped to a predetermined position in a refrigeration cycle. The degree of freedom is low, the structure is complicated, the assembling accuracy is required, the assembling workability is inferior, and the manufacturing cost is high.

An object of the present invention is to solve these problems by forming an expansion valve main body in which a valve drive section and a flow rate adjusting mechanism section are integrated, and detachably mounting the expansion valve main body on the body. The object of the present invention is to improve the workability of assembling and piping, and to reduce the manufacturing cost.

[0005]

In order to solve the above-mentioned problems, the present invention solves the above problem by piping a refrigerant cycle and outputting a predetermined pulse signal to a coil fixed to the outer periphery of the case so that the center of the case can be fixed. In a motor-operated expansion valve that controls the flow rate of refrigerant by driving a provided spindle pin up and down, a throttle portion with which the tip end of the spindle pin engages is located at a position below the through-flow space that houses the lower half of the spindle pin. The formed valve body is integrally provided on the lower surface of the case to form an expansion valve body. A male screw portion is formed on the outer peripheral surface of the valve body, and a female screw portion with which the male screw portion is screwed is formed on the inner peripheral surface of the body having a concave portion communicating with the refrigerant inflow / outlet hole. It is characterized by being screwed into a concave portion of the body and assembled.

[0006] With this configuration, an expansion valve main body in which a valve driving section for driving a spindle pin and a flow rate adjusting mechanism section formed by a tip end of the spindle pin and a throttle section are formed integrally is formed. By screwing into the recess and assembling, it is possible to improve the assembling workability and piping workability.

Further, the electric expansion valve of the present invention can be formed by integrally forming a body with a head of a dryer connected to the refrigeration cycle, and further, the body is provided at an inlet of an evaporator connected to the refrigeration cycle. It can be provided and configured. Thus, the body can be provided at an arbitrary position suitable for the device.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show an embodiment showing the basic configuration of the present invention. In the figures, a spindle pin 2 having a tapered conical tip is provided at the axis of a thin cylindrical case 1. 2
Is provided integrally with a motor rotor having a cylindrical magnet on the outer periphery. A lower cover 3 is provided on the bottom surface of the case 1 so as to be joined to an outer periphery of a lower end portion of the case 1, and a cylindrical pulse motor coil 4 is fixed to the outer periphery of the case 1. The coil 4 is provided with a plurality of protruding pieces 5a protruding downward at equal intervals on the inner peripheral edge of a leaf spring 5 attached to the lower surface, and this protruding piece 5a is attached to the outer peripheral edge of a flange on the upper edge of the lower cover 3. And is fixed to the outer periphery of the main body 1 by fitting into the valleys 3a arranged at equal intervals along. By fixing in this manner, the coil 4 can be fixed at an arbitrary rotation angle, and after the coil 4 is attached, the rotation of the coil 4 is prohibited, and the spindle pin 2 can be reliably driven. The configuration of the valve drive unit that moves the spindle pin 2 up and down is a general configuration.

A valve body 10 having a coolant flow-through space 11 formed in the center is housed in the flow-through space 11 with the lower half of the spindle pin 2 extending downward and joined to the lower cover 3. Are formed integrally. An orifice-shaped throttle portion 12 with which the tip of the spindle pin 2 engages is formed below the through-flow space 11.
Has a shape in which the tip is fitted and closed when the spindle pin 2 descends, and the tip of the spindle pin 2 is connected to the spindle pin 2 in a range from a top dead center (fully open) to a bottom dead center (fully closed). The flow rate adjusting mechanism for adjusting the flow rate of the refrigerant and the amount of reduced pressure by controlling the separation gap from the throttle unit 12 is configured.
As described above, the expansion valve main body in which the valve drive unit and the flow rate adjustment mechanism unit are integrated by integrally providing the valve main body 10 on the lower surface of the case 1 is formed.

A recess 21 is formed in a body 20 to which the valve body 10 is attached, and a refrigerant inflow / outflow port 2 communicating with the recess 21 is provided.
2 and 23 are opened in the side wall of the body 20, and the inflow and outflow holes 2 and 23 are formed.
Refrigerant piping is connected to 2 and 23. Upper inflow / outlet hole 22
A communication hole 16 is opened in a side wall of the valve body 10 at a position suitable for the valve body 10, and when the valve body 10 is assembled to the body 20,
The inflow / outflow hole 22 is configured to communicate with the flow-through space 11.

A male screw portion 15 is formed on an outer peripheral surface near the upper end of the valve body 10, and a female screw portion 25 screwed to the male screw portion 15 is formed on an inner peripheral surface near the upper end of the body 20. The electric expansion valve is assembled by screwing the valve main body 10 into the concave portion 21 from the upper end opening of the body 20 (see FIG. 3), and the O-rings 17 and 18 provided in the circumferential groove of the valve main body 10 airtightly. Sealed. The electric expansion valve assembled in this way is piped to the refrigeration cycle,
By controlling the clearance between the tip end of the spindle pin 2 and the throttle section 12, the flow rate and the pressure reduction amount of the refrigerant are adjusted.

FIGS. 4 and 5 show an embodiment in which the electric expansion valve of the present invention is integrally formed with a dryer 30 which is connected to a refrigeration cycle. The dryer 30 is formed in a closed container shape by joining a head 32 to an upper end opening of a tubular container 31, and a conduit 36 is accommodated in the axis of the container 31. A desiccant 38 is filled between the upper and lower two-layer filters 37, the filter 37 and the desiccant 38 are sandwiched between the upper and lower two perforated plates 39, the inner peripheral edge of each perforated plate 39 abuts on the conduit 36, and the outer peripheral edge is Container 3
The drying agent 38 is stored in the container 31 in a layered state.

A pipe connection hole 33 communicating with the inside of the container 31 is opened in the head 32, and an L is connected to an upper end of a conduit 36.
A letter-shaped communication hole 34 is opened. This head 32
In addition, a body 20 having a recess 21 for mounting the valve body 10 is integrally formed, and one inflow / outflow hole 22 communicating with the recess 21 is opened in a side wall, and the other inflow / outflow hole 2 is formed.
3 communicates with the communication hole 34. Then, as in the previous example, the valve main body 10 is screwed into the concave portion 21 and the electric expansion valve is integrally assembled to the dryer 30 (see FIG. 5).

In the electric expansion valve thus assembled, the refrigerant flowing into the vessel 31 through the pipe connection hole 33 of the dryer 30 is adsorbed by the desiccant 38, and the refrigerant
6 to the inflow / outflow hole 23 through the communication hole 34, and the refrigerant is circulated in the refrigeration cycle by adjusting the flow rate and the pressure reduction amount of the refrigerant by the electric expansion valve.

FIG. 6 shows an evaporator 4 connected to a refrigeration cycle.
This is an embodiment in which the motor-operated expansion valve of the present invention is provided at the inlet portion of the valve. The evaporator 40 includes a plurality of tubes 41 through which a refrigerant flows, arranged at predetermined intervals, and a corrugated fin 4 between the tubes 41.
The body 20 is provided at a position on the near side of the evaporator 40. The body 20 has an inflow / outflow hole 2 which communicates with a recess 21 for mounting the valve body 10.
2, 23 are opened, and the through-passage 27 is opened independently of this. Then, similarly to the previous example, the valve body 10 is screwed into the concave portion 21 and the electric expansion valve is assembled, and the inflow / outflow hole 23 and one end of the through passage 27 are connected to the refrigerant port 45 of the refrigerant of the evaporator 40. The refrigerant pipes 47 and 48 are connected to the inflow / outflow port 22 and the other end of the through passage 27, respectively.

In this electric expansion valve, the refrigerant supplied from the refrigerant pipe 47 is supplied to the evaporator 40 by adjusting the flow rate and reduced pressure of the refrigerant by the electric expansion valve, and the evaporator 40 exchanges heat with air. Then, the refrigerant circulates from the refrigerant pipe 46 to the through passage 27 and the refrigerant pipe 48.

[0017]

As described above, the electric expansion valve of the present invention
An expansion valve body having a valve drive section and a flow rate adjustment mechanism section integrally provided on a lower surface of a case 1 by integrally providing a valve body 10 having a throttle section 12 in which a tip end portion of a spindle pin 2 is engaged with a through-flow space 11. To facilitate the alignment between the tip of the spindle pin 2 and the throttle portion 12, and can be easily assembled simply by screwing the valve main body 10 into the concave portion 21 of the body 20, thereby assembling workability and piping workability. The production cost can be greatly reduced by the improvement of.

The expansion valve body can be easily attached to and detached from the body 20, so that the expansion valve body is excellent in handling.
0 can be provided at any position suitable for equipment such as the evaporator inlet, dryer head, and condenser outlet in the refrigeration cycle. By assembling these members integrally, the number of parts can be reduced. In addition, it is possible to shorten the piping and to reduce the size and thickness of the device.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a state before an expansion valve body according to an embodiment of the present invention is assembled to a body.

FIG. 2 is a plan view of an expansion valve main body with a coil removed.

FIG. 3 is a sectional view showing a state where the expansion valve main body is assembled to the body.

FIG. 4 is a sectional view showing a state before the expansion valve body is assembled to the body in the embodiment in which the electric expansion valve of the present invention is formed integrally with the dryer.

FIG. 5 is a cross-sectional view of a state where the expansion valve body is assembled to the body.

FIG. 6 is a front view of the embodiment in which the electric expansion valve of the present invention is provided at the inlet of the evaporator and the expansion valve main body is assembled to the body.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 2 Spindle pin 4 Coil 10 Valve main body 11 Through-flow space 12 Restriction part 15 Male screw part 20 Body 21 Concave part 22, 23 Inflow / outlet hole 25 Female screw part 30 Dryer 32 Head 40 Evaporator

Claims (3)

[Claims] 1. A spindle pin provided on the axis of the case (1) by piping a refrigerant cycle and outputting a predetermined pulse signal to a coil (4) fixed to the outer periphery of the case (1). In the electric expansion valve for controlling the flow rate of the refrigerant by driving up and down the 2), the through-flow space (1) accommodating the lower half of the spindle pin (2)
A valve body (10) having a throttle (12) with which the tip of a spindle pin (2) engages at a position below 1),
An expansion valve body is formed integrally with the lower surface of the case (1) to form an external thread portion (15) on the outer peripheral surface of the valve body (10), and refrigerant inlet / outlet holes (22) and (23) are formed. On the inner peripheral surface of the body (20) having the communicating recess (21),
An electric expansion valve characterized in that a female screw part (25) to which a male screw part (15) is screwed is formed, and the valve body (10) is screwed into a concave part (21) of the body (20) and assembled. 2. A dryer (3) connected to a refrigeration cycle.
The electric expansion valve according to claim 1, wherein the body (20) is formed integrally with the head (32) of (0). 3. An evaporator piped to a refrigeration cycle (40).
The electric expansion valve according to claim 1, wherein a body (20) is provided at an inlet portion of the motor.