JP2006010228A - Solenoid expansion valve - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solenoid expansion valve capable of quickly and accurately controlling the air-conditioning temperature. <P>SOLUTION: A main valve element 36 has a valve head part 38 contacting with and separating form a valve seat hole 32 of a valve seat 31 arranged in a communicating hole 30, and a valve rod part 37 extending from this valve head part 38 and slidably supported by a valve rod holder 34. A block body is provided with a bypass passage 22 for communicating a space with a second passage 21 for equalizing pressure of the space for projecting the valve rod part 37 from the valve rod holder 34 to the second passage 21. The cross-sectional area of the valve rod part 36 is substantially equalized to the opening area of the valve seat hole 32. Thus, influence on valve opening by a pressure variation on the second passage side can be minimized. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an electromagnetic expansion valve, and more particularly to an electromagnetic linear expansion valve.

For example, when an electric valve as shown in Patent Document 1 is used as an electric expansion valve in a refrigerant cycle used in an air conditioner or the like, the flow rate of the refrigerant is controlled by a pulse motor drive, When quick opening / closing is required, there is a case where it is difficult to adopt the opening / closing.
JP 2004-93022 A

  Accordingly, an object of the present invention is to eliminate the above-mentioned problems of the prior art, and in an electromagnetic expansion valve, the flow rate of fluid can be increased or decreased rapidly according to the operation of the electromagnetic valve. It is possible to provide a solenoid expansion valve in which a check valve is incorporated in one block body as a fluid relief valve when a high pressure exceeding a predetermined pressure is generated in the solenoid valve and the refrigerant pressure. .

  In order to solve the above-mentioned problem, the electromagnetic expansion valve according to claim 1 includes a block main body, a first inlet and a second inlet / outlet through which fluid can flow bidirectionally, and a first passage communicating with the first inlet / outlet. A second passage communicating with the second entrance, a communication hole communicating the first passage and the second passage, and an electromagnetic valve including a main valve body for opening and closing the communication hole. The valve body has a valve head that contacts and separates from the valve seat hole of the valve seat provided in the communication hole, and a valve stem portion that extends from the valve head and is slidably supported by a valve stem holder. The block body is provided with a bypass passage that connects the space and the second passage so that the pressure in the space in which the valve stem portion protrudes from the valve stem holder is equal to the second passage. The first check valve in which an orifice is formed in the first passage and the second passage in the first passage. A second check valve office is formed, characterized in that the is provided in the block body.

  In addition to the above means, the electromagnetic expansion valve according to claim 2 is characterized in that each of the first and second check valves is a small valve having a small pressure receiving area, each of which receives a fluid pressure in the opening direction. And a large valve body having a large pressure receiving area.

Since the present invention is configured as described above, the main valve body can be opened and closed accurately and smoothly, and the direction of the fluid is bidirectional. Therefore, an extremely easy to use electromagnetic expansion valve can be realized. In addition, when the refrigerant reaches a predetermined pressure or higher regardless of which direction is flowed, the high pressure side check valve of the first check valve and the second check valve is opened, and the check valve opens the refrigeration cycle. It is possible to prevent an abnormal increase in the refrigerant pressure.
In addition, the check valve, after the small valve body is "open", the action of the high-pressure refrigerant acts on the entire large valve body, suddenly "open", causing the high-pressure refrigerant to flow out rapidly be able to.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of an electromagnetic expansion valve according to the present invention, and FIG. 2 is a plan view (A) of a valve body of the check valve and a sectional view taken along line BB of the plan view. In addition, although it demonstrates according to drawing below, the expression of upper, lower, left, and right is accompanying description of drawing, and does not necessarily correspond with actual positional relationship.

(Block body 100)
The electromagnetic expansion valve according to the present embodiment is used in a refrigeration cycle such as an air conditioner, and is a substantially rectangular parallelepiped metal block main body 100 such as an aluminum alloy, and a main valve in the block main body 100. It consists of an electromagnetic valve 60 that opens and closes the body 36. As shown in FIG. 1, the block main body 100 is formed with a first entrance / exit 10 to which a refrigerant passage is connected to the right side surface 101, and the block main body 100 faces the right side surface 101 continuously to the first entrance / exit 10. A first passage 11 is formed toward the left side surface 102 of 100. A first orifice 12 is formed in the middle of the first passage 11.

  Further, the left side surface 102 of the block body 100 is formed with a second entrance / exit 20 to which the refrigerant passage is connected, and a second passage 21 is formed horizontally toward the right side surface continuously to the second entrance / exit 20. Has been. In addition, a bypass passage 22 is formed in the middle of the block main body 100 and a fluid communication hole 30 is formed in parallel with the bypass passage 22. An upper end portion of the fluid communication hole 30 is The first passage 11 communicates with the first passage 11, and the first passage 11, the second passage 21 and the fluid communication hole 30 form a fluid passage.

A valve seat 31 is provided at the upper edge of the fluid communication hole 30, and a valve seat hole 32 is formed in the valve seat 31. The valve seat hole 32 communicates with the fluid communication hole 30. A second orifice 23 is further formed in the second passage 21, and a right end portion of the second passage 21 communicates with a first hole 41 (described later) of the first check valve 40.
Further, an electromagnetic valve mounting hole 35 having a certain depth is formed in the upper part of the block body 100, and a valve rod hole 33 is formed in the center bottom thereof, and the valve rod hole 33 communicates with the first passage 11. Yes. A valve stem holder 34 is mounted and coupled to the valve stem hole 33.

(Solenoid valve 60)
Next, the electromagnetic valve 60 mounted in the electromagnetic valve mounting hole 35 will be described.
A solenoid part 63 constituting the solenoid valve 60 is housed in a solenoid housing 62, and a screw part is formed in the lower part of the solenoid housing 62, and a sealing material such as a gasket (not shown) is formed in the solenoid valve mounting hole 35. It is screwed and fixed via. A cylindrical sleeve 61 is provided at the lower part of the solenoid housing 62, and a suction element 67 is integrally fixed to the upper part thereof.
The suction element 67 is formed in a cylindrical shape as a whole, has the same outer diameter as the sleeve 61, and a push bar 69 is inserted in the lower part thereof so as to be movable up and down. Further, a spring is provided between a push rod side spring receiver 69a provided at the upper end portion of the push rod 69 and an adjustment side spring receiver 71 disposed on an adjustment screw 70 screwed to the upper end portion of the suction element 67 so as to be vertically adjustable. 72 is interposed. The spring 72 urges the valve head 38 below the main valve body 36 downward (in the closing direction) via the push rod 69, the plunger 68 and the valve rod portion 37.

  That is, the plunger 68 is provided at the lower end portion of the push rod 69 so as to be movable up and down by being guided by the sleeve 61, and the valve rod portion 37 is fixed to the valve rod hole 68 b formed in the center portion of the plunger 68. Yes. In addition, a pressure equalizing hole 68 a is formed in one side portion of the plunger 68. Further, a main valve body 36 is formed at the lower end portion of the valve stem portion 37 so as to be detachable from the valve seat 31. An intermediate portion of the valve stem portion 37 is slidably supported by the valve stem holder 34.

The lower portion of the suction element 67 is formed to be recessed in a truncated cone shape over the entire circumference, and the upper end side of the opposed plunger 68 is formed in a truncated cone shape. With this configuration, the vertical movement of the main valve body 36 interlocked with the plunger 68 can be adjusted to a linear state by the magnitude of the current amount with respect to the electromagnetic valve 60.
The adjustment screw 70 is adjusted by a driver portion 75 a of a connect-integrated coil assembly 75 that is mounted above the plate 76 above the solenoid housing 62. The engaging portion between the suction element 67 and the adjusting screw 70 is connected in a watertight manner by a waterproof ring 74. The coil assembly 75 is attached to the solenoid housing 62 via a waterproof O-ring 73. The coil 64 is wound around the bobbin 65.

(First check valve 40)
Next, the first check valve 40 formed using the first orifice 12 formed in the first passage 11 will be described. The first check valve 40 is provided in a first hole 41 formed in the block main body 100, and includes two parts having different inner diameters. With the lower shoulder of the first orifice 12 as a valve seat, the first valve body 42 is elastically pressed in the closing direction by a first spring 43 with a predetermined spring pressure. That is, a first spring retainer 45 is disposed below the first spring 43, and the first spring 43 is disposed between the first screw receiving portion 46 formed on the first spring retainer 45 and the first valve body 42. Has been. Further, a sealing plug 44 is screwed to the lower portion of the first hole 41 via a sealing material, for example, a gasket (not shown).

As shown in FIGS. 2A and 2B, the first valve body 42 is formed of a first small valve body 42a made of a small diameter portion and a first large valve body 42b made of a large diameter portion. The small valve body 42 a is pressed against the lower shoulder (valve seat) of the first orifice 12, and the outer peripheral portion of the first large valve body 42 b is in contact with the small diameter portion of the first hole 41.
With the above configuration, the first check valve 40 is “closed” by the first spring 43 when the refrigerant pressure with respect to the first orifice 12 is equal to or lower than a predetermined value. The refrigerant pressure acting on 12 is “open”.
After the first small valve body 42a is "opened", the action of the high-pressure refrigerant acts on the entire first large valve body 42b, and the first check valve 40 is suddenly "opened" The high-pressure refrigerant in the first passage 11 quickly flows into the second passage 21 and flows out from the second inlet / outlet 20. Thus, the first check valve 40 performs a bypass action when the high-pressure refrigerant flows from the first inlet / outlet 10 and flows out as the low-pressure refrigerant from the second inlet / outlet 20.

(Second check valve 50)
The second check valve 50 is formed using the second orifice 23 formed in the second passage 21, and the configuration thereof is the same as that of the first check valve 40. However, the second spring retainer 55 that supports the second spring 53 is attached to the bottom of the electromagnetic valve mounting hole 35 and does not require a sealing plug. The second check valve 50 includes a second hole 51 formed in the same shape as the first hole 41, a second valve body 52 formed in the same shape as the first valve body 42, and a first small valve. A second small valve body 52a formed in the same shape as the body 42a, a second large valve body 52b formed in the same shape as the first large valve body 42b, and a second spring formed in the same shape as the first spring 43. 53 and a second screw receiving portion 56 formed in the same shape as the first screw receiving portion 46.

  The second check valve 50 is formed as an abnormal high-pressure refrigerant bypass passage when high-pressure refrigerant acts on the second inlet / outlet 20 side and flows toward the first inlet / outlet 10 side. The same as the first check valve 40.

(Refrigerant pressure influence means)
Further, a bypass passage that communicates with the second passage 21 regardless of which direction the refrigerant flows from the first entrance 10 to the second entrance 20 or from the second entrance 20 to the first entrance 10. The refrigerant in the valve 22 passes through the gap between the valve stem holder 34 and the plunger 68, the pressure equalizing hole 68a, the gap between the push rod 69 and the plunger 68, etc., and reaches the valve stem hole 68b. The pressure substantially the same as the refrigerant pressure in 21 is applied.
That is, the sectional area of the valve seat hole 32 and the sectional area of the valve stem hole 68b are formed to be the same, and the refrigerant pressure from the lower part and the upper part of the main valve body 36 is the same. Therefore, the load acting on the main valve body 36 can be made substantially zero.
As a result, when a current is passed through the electromagnetic valve 60, the attractor 67 is magnetized according to the amount of current, and the plunger 68 is magnetically attracted and moves up according to the amount of magnetism, but the effect of the refrigerant pressure is not affected. Therefore, it will move up and down accurately.

  In the above embodiment, the case where two check valves are used has been described. However, the present invention is not limited to this. For example, in the case of a one-way flow that flows only from the first entrance 10 to the second entrance 20. Of course, only the first check valve 40 may be provided as the check valve.

(Usage mode)
Next, the operation of the embodiment having such a configuration will be described. As shown in FIG. 3, the electromagnetic expansion valve according to the present embodiment is used in a refrigeration cycle of an air conditioner, and a pipe between an outdoor heat exchanger 3 and an indoor heat exchanger 5 as in a known refrigeration cycle. It is arrange | positioned at the path | route 6, and functions in any flow direction of the refrigerant | coolant of a cooling cycle or a heating cycle.
In the cooling cycle, the refrigerant flowing through the pipeline 6 circulates with the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the expansion valve 4, the indoor heat exchanger 5, the four-way valve 2, and the compressor 1. In this flow, the refrigerant flows in from the first port 10 of the expansion valve 4 and flows out from the second port 20.

  The high-pressure refrigerant flowing into the first inlet / outlet 10 from the outdoor heat exchanger 3 is turned on (activated) and the pressure is reduced through the valve seat hole 32 by energization of the electromagnetic valve 60, and the fluid communication hole 30. Then, it flows out from the second entrance / exit 20 and is sent to the indoor heat exchanger 5. At this time, since the same refrigerant pressure is applied to the upper part and the lower part (valve head part 38) of the main valve body 36 of the electromagnetic valve 60, the valve seat hole 32 and the main valve body are changed depending on the energization amount to the electromagnetic valve 60. Thus, the valve opening degree with respect to 36 can be set accurately and quickly, and the amount of refrigerant flowing out to the second inlet / outlet 20 can be accurately controlled.

In addition, when the high-pressure refrigerant flowing into the first entrance / exit 10 is equal to or higher than a predetermined pressure, the first check valve 40 is quickly opened and flows out from the second entrance / exit 20 via the second passage 21. The refrigerant can be bypassed, and an abnormal increase in the refrigerant pressure in the refrigeration cycle can be prevented.
In the heating cycle, the refrigerant flowing through the pipeline 6 is the compressor 1, the four-way valve 2, the indoor heat exchanger 5 (heating action), the expansion valve 4, the outdoor heat exchanger 3, the four-way valve 2, and the compressor 1. And circulate. In this heating cycle, the refrigerant flows in from the second inlet / outlet 20 of the expansion valve 4, flows out of the first inlet / outlet 10, and performs the same operation as in the cooling cycle.

That is, the compressor 1 is turned on (started up), and the high-pressure refrigerant flowing into the second inlet / outlet 20 from the indoor heat exchanger 5 is depressurized through the valve seat hole 32 by energization of the electromagnetic valve 60 and is in fluid communication. It flows out from the 1st entrance / exit 10 through the hole 30, and is sent to the outdoor heat exchanger 3. FIG. At this time, since the same refrigerant pressure acts on the upper and lower portions of the main valve body 36 of the electromagnetic valve 60, the valve between the valve seat hole 32 and the main valve body 36 depends on the energization amount to the electromagnetic valve 60. The opening can be accurately and quickly set, and the amount of refrigerant flowing out to the first entrance / exit 10 can be accurately controlled.
Moreover, if the high-pressure refrigerant flowing into the second inlet / outlet 20 is equal to or higher than a predetermined pressure, the second check valve 50 is quickly opened and flows out from the first inlet / outlet 10 via the first passage 11. The refrigerant can be bypassed, and an abnormal rise in the refrigerant pressure in the refrigeration cycle can be prevented as in the cooling cycle.

  As described above, the flow path diameter (valve opening direction pressure receiving area) of the valve seat 31 and the upper part of the main valve body 36 (inner diameter of the valve stem hole 68b that supports the valve stem portion 37 (valve closing direction pressure receiving area)). By making the same, the refrigerant pressure applied to the lower part of the main valve element 36 and the fluid pressure applied to the upper part of the main valve element 36 are made equal, so that the load acting on the main valve element 36 is made substantially zero. Therefore, it is possible to realize an electromagnetic expansion valve that responds according to the amount of current control to the solenoid unit. As a result, the refrigerant flow rate can be increased or decreased quickly (that is, air conditioning (indoor temperature control) can be performed quickly). Further, for the refrigerant pressure equal to or higher than the set pressure, the refrigerant can be bypassed to prevent an abnormal increase in the refrigerant pressure in the refrigeration cycle.

The longitudinal section of the electromagnetic expansion valve concerning the present invention. The top view (A) of the valve main body of the non-return valve used for the same electromagnetic expansion valve, and the BB sectional drawing (B) of FIG. 2 (A). Explanatory drawing of the refrigerating cycle of the air conditioner to which this embodiment is applied.

Explanation of symbols

1 ・ ・ Compressor, 2 ・ ・ 4-way valve, 3 ・ ・ Outdoor heat exchanger, 4 ・ ・ Expansion valve,
5 .. Indoor heat exchanger, 6 .. Pipe line, 10 .. First entrance, 11 .. First passage,
12 .... first orifice, 20 .... second inlet / outlet, 21 ... second passage,
22 .. Bypass passage, 23 .. Second orifice, 30 .. Fluid communication hole,
31 ... Valve seat, 32 ... Valve seat hole, 33 ... Valve rod hole, 34 ... Valve rod holder,
35 ... Solenoid valve mounting hole, 36 ... Main valve element, 37 ... Valve stem, 38 ... Valve head,

40..First check valve, 41..First hole, 42..First valve body,
42a ... first small valve body, 42b ... first large valve body, 43 ... first spring,
44..Seal plug, 45..First spring presser, 46..First screw receiving portion,
50 .. Second check valve 51.. Second hole 52. Second valve body
52a ... second small valve body, 52b ... second large valve body, 53 ... second spring,
55 .. Second spring presser, 56 .. Second screw receiving part, 60 .. Solenoid valve,

61 .. Sleeve, 62 .. Solenoid housing, 63 .. Solenoid part,
64 .. Coil, 65 .. Bobbin, 67 .. Suction element, 68 .. Plunger,
68a ... equal pressure hole, 68b ... valve stem hole, 69 ... push rod,
69a..Push bar side spring support, 70..Adjustment screw, 71..Adjustment side spring support,
72 ... Spring, 73 ... O-ring, 74 ... Waterproof ring,
75 .. Coil assembly, 75a .. Driver part, 76 .. Plate,
100 .. Block body, 101 .. Right side of block body,
102 .. Left side of block body

Claims (2)

A first main inlet and a second inlet / outlet through which fluid can flow bidirectionally, a first passage communicating with the first inlet, a second passage communicating with the second outlet, and the first passage; A communication hole that communicates with the second passage, and an electromagnetic valve that includes a main valve body that opens and closes the communication hole;
The main valve body includes a valve head that contacts and separates from a valve seat hole of a valve seat provided in the communication hole, and a valve stem portion that extends from the valve head and is slidably supported by a valve stem holder. Have
The block body is provided with a bypass passage that connects the space and the second passage so that the pressure of the space in which the valve stem portion protrudes from the valve stem holder is equal to the second passage. An electromagnetic expansion valve characterized in that a first check valve having an orifice formed in one passage and a second check valve having an orifice formed in the second passage are provided in the block body. In each of the first and second check valves, the valve body that receives the fluid pressure in the opening direction is composed of a small valve body having a small pressure receiving area and a large valve body having a large pressure receiving area. The electromagnetic expansion valve according to claim 1.

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