JPS62147183A - Four port connection vavle for refrigerating cycle - Google Patents

Abstract

PURPOSE:To obtain a four port connection valve for a refrigerating cycle with high reliability as to switching operation and operable for switchover at all times by providing a solenoid to be used for moving cylindrical sliders for switching refrigerant passages in the axial direction of the cylinders. CONSTITUTION:Cylindrical sliders 24, 25 for switching respective refrigerant passages 21, 22, 23, 17 include a stem 35 having one end fixed through a spring 34, and a solenoid coil 32 is disposed around the stem 35. Therefore, in the above four port connection valve for a refrigerating cycle, energization of the solenoid coil 32 causes the stem 35 to be pulled up, permitting free valve operation even when the air conditioner is stopped, and furthermore improved reliability is obtainable because of its electromagnetic control.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a refrigeration cycle, and particularly to a four-way valve for a refrigeration cycle used for switching between cooling and heating in a heat pump type air conditioner.

BACKGROUND OF THE INVENTION In recent years, the demand for refrigeration cycle western valves has increased rapidly as air conditioners increasingly use heat pumps, and there is a strong demand for smaller size and lower cost.

Hereinafter, an example of a conventional refrigeration cycle west valve will be described with reference to the drawings.

FIG. 4 shows a cross section of a conventional four-way valve for a refrigeration cycle. Reference numeral 1 denotes a sealed cylindrical valve body, and 2 and 3 denote a discharge pipe and a suction pipe connected to opposite sides of the circumferential surfaces of the valve bodies 2 and 3, respectively. 4゜6 are first and second conduits provided on both sides with the suction pipe 3 in the center, and the first conduit 4 is connected to an indoor heat exchanger (hereinafter referred to as "indoor unit") (not shown). ), and the second conduit 5 is connected to an outdoor heat exchanger (hereinafter referred to as "outdoor unit") (not shown). Each of the connecting pipes 2, 3, 4.5 opens into the valve body 1, and the open ends of the connecting pipes 2, 4.5 arranged in parallel are flush with a sheet 6 in the axial direction of the valve body 1. It is fixed to the valve body 1. 7 is a sliding valve that is inside the valve body and slides in the axial direction on the seat 6 surface, and the suction pipe 3 and the first conduit 4 or the suction pipe 3 and the second conduit 6 are selected. It has a U-shaped concave surface 7a that allows communication. 8 and 9 are connected to each other by a connecting plate 10 on both sides of the sliding valve 7, and have minute holes 8a and 9a.
It is a piston body having. 11.12 is the valve body 1
It is a lid that seals the end face of the 13°14 is the lid j1.
This is a bleed pipe that opens into the space R1, R2 between 12 and selectively communicates with the suction pipe 3 by energizing the electromagnetic pilot valve 15 to introduce low pressure gas.

The operation of the four-way valve for the refrigeration cycle constructed as above will be explained.

The bleed pipe 1 is opened by energizing the electromagnetic pilot valve 16.
3.14, the space R1 or space R2 is selectively communicated with the suction pipe 3 to reduce the pressure inside the space, and the valve body 1 is also connected through the micro holes 8a, 9a of the piston bodies 8, 9.
By introducing the pressure on the discharge side of the inside into the space on the opposite side and making it high pressure, the slide valve 7 connected to the piston bodies 8 and 9 is moved by the difference in high and low pressures in the rain space, and the pressure is introduced from the discharge pipe 2. A high-pressure refrigerant is communicated with the second conduit and the indoor unit is used as a condenser to heat the room, or a high-pressure refrigerant is communicated with the first conduit 4 and the outdoor unit is used as a condenser and the indoor unit is used as an evaporator. It cools the room.

Problems to be Solved by the Invention However, in the above configuration, the electromagnetic pilot valve 1
6 converts high and low pressures, and the valve is switched based on the pressure difference. Therefore, the pilot valve 16 itself is indispensable, and the structure is complicated and the cost is very high. Furthermore, the valve body 1 is also large and cannot be used during heating. Heat loss in the main body 1 was large, greatly reducing the heating capacity of the system.

In addition, there are several valve mechanisms in addition to the valve body, and poor sealing at the valve parts has been a problem. Furthermore, pilot valve 15
Since the valve body 1 and the valve body 1 are connected by air bleed pipes 13 and 14, there are many connection points, resulting in high costs and the risk of gas leakage.

In addition, the operation of the valve is switched depending on the pressure difference, so it cannot operate when there is no pressure difference in the reservoir.It requires a certain pressure difference, so it cannot be switched unless the air conditioner etc. is running. This caused operational losses in the early stages.

In view of the above problems, the present invention provides a four-way valve for refrigeration cycles that is low cost, has a simple structure, has no pilot valve, has a small Shikamo solenoid, has high reliability in switching operation, and has low heat loss at the valve body during heating. This is what we provide.

Means for Solving the Problems In order to solve the above problems, the four-way valve for a refrigeration cycle of the present invention has its seat surface fixed in parallel within a cylinder, and has an elongated boat shape elongated in the circumferential direction of the cylinder. A pair of valve seats each having an outlet port and a first and second port, each having a circular slide seat ring of the same shape fixed thereto that contacts the pair of valve seats and seals the inside and outside of the valve seats. A cylindrical holder containing a cylindrical slider is disposed at both ends, and a solenoid is used to move the holder in the axial direction of the cylinder, thereby selecting a passage communicating with the outlet and opening the refrigerant passage. It is configured so that it can be switched.

Operation The present invention has the above-described configuration, so that even if a pressure difference between the heights of the system is applied to the inside and outside of the slider and the holder, both of them are maintained at a neutral point without being subjected to the biasing force due to the pressure difference.
Since the slider can be moved in the cylinder axial direction with a small amount of force that is sufficient to resist the surface pressure required for the slide seat ring to seal the inside and outside, valve switching can be performed without using a pilot valve mechanism as in the past. Significant cost reduction, simplification, and improved reliability can be achieved. Furthermore, by making the outlet and the first and second ports provided on each valve seat into oval port shapes that are long in the circumferential direction of the cylinder, the flow path of each opening port; Since the pitch of each opening port in the direction can be shortened, the amount of movement of the holder in the cylinder axis direction required to switch the port connected to the outlet can be significantly reduced, and the suction load on the solenoid is significantly reduced. However, the solenoid can be made smaller, the overall length of the cylinder can be shortened, and the valve body can be made smaller.

EXAMPLE Hereinafter, a four-way valve for a refrigeration cycle according to an example of the present invention will be described with reference to the drawings. Figure 1.

FIG. 2 shows a cross-sectional view of a four-way valve for a refrigeration cycle in an embodiment of the present invention when no current is applied.

Reference numeral 16 denotes a cylinder forming a valve body, and an inlet 17a of a discharge pipe 17 connected to the discharge side of the compressor is opened on the side surface. Reference numeral 18 denotes a lid that is fitted and welded to one end 16a of the cylinder 16. 19. 20 is a seat surface 19a on the inner wall of the cylinder 16.

20a are fixed so as to face each other in parallel.

The first valve seat 19, which is the second valve seat, has an elongated port-shaped outlet 19b extending in the circumferential direction of the cylinder 16, through which the suction vibe 21 connected to the suction side of the compressor opens. ing.

Further, the second valve seat 20 has a first and second connecting pipe 22, 23, which are connected to the outdoor coil and the indoor coil, each of which functions reversibly as a condenser or an evaporator, opening in the cylinder 16. The first and second ports 20b have an oval boat shape that is long in the circumferential direction.

20c are opened in parallel in the axial direction of the cylinder 16.

24.25 is a cylindrical slider located inside the cylinder 16, located between the seat surfaces 19a and 2Oa of the first and second valve seats 19.20, and stored inside both ends of the cylindrical holder 26. and integrally form a substantially cylindrical refrigerant flow path that is slidable in the axial direction of the cylinder 16.

On the side of the slider 24.26 in contact with the valve seat 19.20, there is a seat surface 19a of the valve seat 19, 20;
Circular slide seat rings 24a, 26 of the same shape that come into contact with 20a and form the seat surfaces of the sliders 24°26
a is fixed.

Seal rings 27 and 28 are formed in a substantially square shape, and are housed in the outer circumferential recesses 24b and 25b of the slider 24 and 25, and press against the inner surface of the holder 26 to seal the slide seat ring 24a.

25b, it seals the inside and outside of the substantially cylindrical flow path formed by the pair of sliders 24, 25 and holder 26.

Reference numeral 29 is a circular leaf spring inserted between the sliders 24 and 26, and the sliders 24 and 25 are connected to the seat surface 19a.
, 2Oa side. 30 is a lid that closes the other end of the cylinder 16. 31 is a solenoid fixedly attached to the center of the lid 30, and includes a fixed iron core 32, an electromagnetic coil 33. Return spring 34. It is composed of a plunger 36 connected to the holder 26. Then, the holder 26 slides in the cylinder 16 in the axial direction by controlling the supply of electricity to the electromagnetic coil 33. The positions of the slide seat rings 24a and 25a fixed to both ends of the sliders 24 and 25 provided at both ends of the holder 26 are the same as those of the sliders 24 and 25a shown in FIG.
4 in the first position (electromagnetic coil 33 is not energized), the outlet 19b and the first port 20b are communicated with each other, and the plunger 35 and the holder 26 are energized by the electromagnetic coil 33.
At the second position (Fig. 4) where the
9b and the second port 20c are designed to communicate with each other.

The operation of the four-way valve for a refrigeration cycle constructed as described above will be explained below with reference to FIGS. 1 to 4. 1st
3 to 3 show the state when the electromagnetic coil 33 is not energized, and the plunger 35 is biased to the left in the figure by the action of the return spring 32, and the holder 26 comes into contact with the lid 18 and stops. As a result, sliders 24, 25 and holder 2
6 communicates the outlet 19b with the first port 20b,
On the other hand, the introduction port 17a and the second port 20c are also connected to the cylinder 16.
communicated through the interior of the Therefore, the refrigerant gas becomes the cooling cycle circuit of compressor - discharge pipe 17 - first connection pipe 22 - outdoor coil - expansion valve - indoor coil - second connection, connection pipe 23 - suction vibrator 21 - pressure@machine. .

Next, when the electromagnetic coil 33 is energized (FIG. 4), the plunger 35 is attracted to the fixed iron core 32. As a result, the slider 24, 25 and the holder 26 cause the outlet 19 to
b and the second port 20c communicate with each other, while the inlet port 17
a and the first port 20b are also communicated through the interior of the cylinder/torter 16. Therefore, the refrigerant gas flows through the compressor-discharge pipe 1
7-Second connecting vibe 23-Indoor coil-Expansion valve-Outdoor coil-First connecting pipe 22-Suction pipe 21-Compressor heating cycle circuit.

As described above, according to this embodiment, the seat surfaces 19a and 20a are fixed in parallel within the cylinder 16, and the outlet port 19 has an elongated boat shape that is long in the circumferential direction of the cylinder 16a.
b and the first and second ports 2ob.

A pair of circular slide seat rings 24a and 25a having the same shape and having a pair of valve seats each having a diameter of 20C and abutting against the valve seats 19 and 20 and soles the inside and outside of the valve seats 19 and 20.
A cylindrical holder 26 is disposed in which a pair of cylindrical sliders 24 and 25 to which the solenoid 3 is fixed is housed at both ends.
By directly moving the holder 26 in the axial direction of the cylinder 16 using the
0b.

20C is selected and is configured to switch the refrigerant passage, so even if the pressure difference between the height and the bottom of the system is applied to the inside and outside of the slider and holder, both are maintained at a neutral point without being subjected to the biasing force due to the pressure difference. However, since the slider can be moved in the cylinder axis direction with a small amount of force that is enough to resist the surface pressure required for the slide seat ring to seal the inside and outside, valve switching can be done without using the pilot valve mechanism as in the past. This results in significant cost reduction and simplification.
Reliability can be improved. Furthermore, by making the outlet and the first and second ports provided in each pulp sort into an elliptical shape that is long in the circumferential direction of the cylinder, the cross-sectional area of the flow path of each opening is ensured. Since the opening angle can be shortened, the amount of cylinder axial movement of the holder required to switch the port connected to the outlet can be significantly reduced, and the suction load on the solenoid is significantly reduced. It is possible to reduce the size of the valve body, reduce the overall length of the cylinder, and reduce the size of the valve body.

Effects of the Invention As described above, the present invention provides a pair of cylinders whose seat surfaces are fixed parallel to each other in a cylinder, each having an elongated outlet and a first and second outlet in the circumferential direction of the cylinder. A cylindrical holder is disposed in which a pair of cylindrical sliders are housed at both ends, and a circular slide seat ring of the same shape is fixed to the pair of valve seats to seal the inside and outside of the pair of valve seats. , by moving the holder in the cylinder axial direction using a solenoid, the outlet communicating with the outlet is selected and the refrigerant passage is switched 111
! As a result, even if the pressure difference between the height and the bottom of the system is applied to the inside and outside of the slider and holder, both are held at a neutral point without receiving the biasing force due to the pressure difference, so the slide seat ring is necessary for sealing the inside and outside. Since the slider can be moved in the cylinder axial direction with a small amount of force that is sufficient to resist surface pressure, valve switching can be performed without using a pilot valve mechanism as in the past, resulting in significant cost reduction, single-use design, and reliability. Improvements can be made. Furthermore, by making the outlet port provided on each valve seat and the first and second through holes of the cylinder long in the circumferential direction, the cylinder and axis are secured while ensuring a flow passage cross-sectional area of [1; 40]. Since the opening distance in each direction can be shortened, the amount of movement of the holder in the cylinder axis direction required to switch the outlet connected to the outlet can be significantly reduced, and the suction load on the solenoid is significantly reduced. , the solenoid can be made smaller, the total length of the cylinder can be shortened, and the valve body can be made smaller.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the cooling state of a four-way valve for a refrigeration cycle in an embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along line xx' in FIG.
3 is a perspective view of the main part showing the valve switching mechanism in FIG. 1, FIG. 4 is a sectional view showing the heating state in FIG. 1, and FIG. 5 is a conventional four-way valve for a refrigeration cycle. FIG. 16...Cylinder, 19,20...Valve seat, 19b...Outlet, 20b, 20c
······first. Second port, 24.25...Slider, 24a
. 25a...-Slide seat ring, 26...
...Holder, 31 ・---Solenoid. Name of agent: Patent attorney Toshio Nakao and 1 other person/6
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Claims (1)

[Claims] A cylinder forming a valve body and having an inlet, an outlet having a seat surface fixed parallel to the cylinder and having an elongated port shape extending in the circumferential direction of the cylinder, and first and second ports. a pair of cylindrical sliders each having a pair of valve seats, a pair of cylindrical sliders to which a circular slide seat ring of the same shape is fixed to contact the pair of valve seats to seal the inside and outside of the valve seats, and the pair of sliders are housed at both ends. a cylindrical holder that forms a flow path and moves in the axial direction of the cylinder to selectively communicate the outlet with the first or second communication port, and a solenoid that directly drives the holder. A four-way valve for refrigeration cycles characterized by: