JPS62101977A - Four way type valve for refrigerating cycle - Google Patents

Abstract

PURPOSE:To simplify construction of a valve so as to improve its assembly workability, by providing a cylindrical slider, which provides slide seat rings of the same bore sealing the inside and outside, to be arranged between valve seats. CONSTITUTION:Slide seat rings 42, 43 of the same bore are contained in stepped pats 41a, 41b outside a cylindrical slider 41. The slider 41 is slided in the axial direction in a cylinder 33 by energizing a solenoid coil 47 to be controlled. The slide seat rings 42, 43, provided in both ends of the slider 41, are positioned such that a flow outlet 36b communicates with the first flow port 37b, when the solenoid coil 47 is not energized, while with the second flow port 37c by attracting a plunger 49 and the slider 41 when the solenoid coil 47 is energized.

Description

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

A conventional technique outlet 17a, a first port 18a, and a second port 19a are formed.

The discharge pipe 16 of the compressor 1 is always in communication with the valve chamber 12 via the inlet 16a, and the outlet 1 of the suction pipe 17 of the compressor is connected to the valve chamber 12 through the inlet 16a.
7a is always in communication with a flow path 21 formed by the slide valve 15 and the valve seat 2o. Also, the first port 18a of the pipe 18 and the second port 19a of the pipe 19 are connected to the indoor heat exchanger 4 and the outdoor heat exchanger 6, respectively. and communicates with the valve chamber 12 or the flow path 21 depending on the position of the slide valve 15.

The pistons 9, 10 are provided with pressure balance holes 22, 23.

Next, the structure of the pilot valve device 8 will be explained.

Two valve chambers 24 and 25 are provided in the pilot device 8, and a needle valve 2 is operated by a solenoid coil 26.
It has communication holes 29 which are alternately closed at 7.28.

Needle valves 27 and 28 in FIG. 6 indicate a state in which the solenoid coil is energized, that is, a heating state. 30 is a thin tube that communicates the communication hole 29 with the suction pipe 17, and 31 is a thin tube between the valve chamber 11 and the valve chamber 24. A thin tube 32 communicates the valve chamber 13 and the valve chamber 26.

The operating state of the refrigeration cycle four-way valve configured as above will be described below.

Figure 5 shows the state of heating operation υ, each valve chamber 11.1.
The pressures at 2, 13, and 24.25 are as follows.

The valve chamber 12 becomes high pressure due to the discharge gas of the compressor 1, and an attempt is made to maintain the valve chamber 11 and the valve chamber 13 at a high pressure through the compression balance holes 22 and 23 provided in the pistons 9 and 10. However, the inside of the pilot valve device 8 needle valve 2
7 closes the communication hole 29, the valve chamber 13 is connected to the thin tube 32.
．． The valve chamber 25 communicates with the suction pipe 17 via the communication hole 29 and the thin tube 3o, and is under low pressure. Therefore, a pressure difference is generated between the valve chambers 11 and 13 via the pistons 9 and 10, and the pistons 9 and 10 and the slide valve 15
is pushed to the right in the drawing to maintain a predetermined heating operation state.

Next, the operation of the four-way valve 3 when the heating operation is stopped and the defrosting operation is started or when the cooling operation is started will be explained.

In FIG. 4, the solenoid coil 26 is de-energized. Therefore, the needle valves 27 and 28 move to the left in the drawing, and the needle valve 28 closes the communication port 29, and the needle valve 28 closes the communication port 29.
30 comes into communication with the valve chamber 24. Therefore, the valve chamber 11, which is under high pressure during heating, is replaced by the thin tube 31. Valve chamber 24.
It communicates with the suction pipe 17 through the thin tube 30, and the pressure suddenly becomes low.

Therefore, a pressure difference is created between the valve chamber 12 and the valve chamber 11 across the piston 9, and this pressure difference pushes the piston 9゜1o and the slide valve 16 to the left in the drawing, and the discharge pipe 16 and the pipe 19 are Port 16a, valve chamber 12. The pipe 18 communicates with the first port 19a through the second port 19a.
8a, the suction pipe 17 via the flow path 21° outlet 17a
It communicates with the air conditioner and enters defrosting or cooling mode.

Problems to be Solved by the Invention However, in the above configuration, in each state of heating operation, cooling operation, and defrosting operation, the slide valve 16 is able to balance the high-pressure refrigerant pressure in the valve chamber 12 and the low-pressure refrigerant pressure in the flow path 21. Due to the pressure difference, the valve seat 2 is pressed with excessive force, so when switching from heating operation to cooling operation or defrosting operation or vice versa, slide valve 1
5 is driven by a pilot method that utilizes the difference between high and low pressures of refrigerant gas. Therefore, a very large number of parts are required, and the structure is complicated, making the assembly process complicated. It had some problems. Furthermore, thin tubes 30, 31.32° and pressure balance holes 22,
23. There are also problems in terms of reliability, such as the possibility that the communication hole 29 of the pilot valve 8 may be blocked by foreign matter in the refrigerant circuit, resulting in a switching operation.

In view of the above-mentioned problems, the present invention provides a four-way valve for a refrigeration cycle that has a simplified structure, improved assembly workability, reduced cost, and improved reliability of switching operation.

Means for Solving the Problems In order to solve the above-mentioned problems, the four-way valve for refrigeration cycle of the present invention has its seat surface fixed in parallel within the cylinder, and has an outlet port and first and second ports respectively. A cylindrical slider is disposed between the valve seats and has a slide seat ring of the same diameter that seals the inside and outside of the valve seats, and the slider is moved in the cylinder axial direction. It is constructed so that all the vents communicating with the outlet are selected and the refrigerant passages are switched.

Function: Due to the above-described configuration, the slider is not affected by the pressure difference and is held at a neutral point even if a pressure difference between the height and the low side of the system is applied to the inside and outside of the cylindrical slider. Since the width can be reduced to a large extent, valve switching can be performed without using a pilot pulp mechanism as in the conventional case, and it is possible to significantly reduce costs, reduce size, and improve reliability.

EXAMPLE A four-way valve for a refrigeration cycle according to an example of the present invention will be described below with reference to the drawings. FIG. 1 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 33 denotes a cylinder forming a valve body, and an inlet 34a of a discharge pipe 34 connected to the discharge side of the compressor is opened on the side surface. Reference numeral 35 designates a lid that is fitted and welded to one end 33a of the cylinder 33. Reference numerals 36 and 37 denote first and second valve seats fixed to the inner wall of the cylinder 33 with seat surfaces 36a and 37a facing each other in parallel, and the first valve seat 36 has a valve seat connected to the suction side of the compressor. The outlet 36b to the suction pipe 38 is open. In addition, the second valve seat 37 has first and second connecting pipes 39 and 40 opened therein, which are connected to the outdoor coil and the indoor coil, respectively, which function reversibly as a condenser or an evaporator. Second ports s7b, 370 are opened in parallel in the axial direction of the cylinder 33. Reference numeral 41 denotes a cylindrical slider that is located inside the cylinder 33 and is slidable in the axial direction, and has stepped portions 41a on the outside of both ends thereof.

41b has the same diameter slide seat ring 42°43
is stored inside the slider 41 and when a system pressure difference is applied between the inside and outside of the slider 41 and the pulp seat) 36.
, 37 and come into close contact with the sheet surfaces of the sliders 41
Seal inside and out. 44 is a lid that closes the other end of the cylinder 33.

Reference numeral 46 denotes a drive source consisting of an operating solenoid fixedly attached to the center of the lid 44, a fixed iron core 46, an electromagnetic coil 47, a return spring 48, and the slider 41.
The slider 41 is configured to include a plunger 49 connected to the cylinder 33, and the slider 41 slides in the axial direction within the cylinder 33 by controlling the energization of the electromagnetic coil 47. and slider 4
Slide seat rings 42 and 43 provided at both ends of 1
In the position shown in FIG. 1, the plunger 49 and the slider 41 are attracted by energizing the outlet port 3eb and the first 3-way valve 47 when the slider 41 is in the first position (the electromagnetic coil 47 is not energized). In the second position (Fig. 3), the outlet 5c
sb and the second port 38b are designed to communicate with each other.

The operation of the four-way valve for the refrigeration cycle constructed as described above will be explained below with reference to FIGS. 1 to 3. 1st
Figure 2 shows the condition when the electromagnetic coil 47 is not energized, and the plunger 49 is biased to the left in the figure by the action of the return spring 48, and the slider 41 comes into contact with the lid 35 and stops. . As a result, the slider 41 allows the outlet port s6b to communicate with the first port 37b, while the inlet port 34a and the second port 38b also communicate through the inside of the cylinder 33.

Therefore, the refrigerant gas goes through the cooling cycle circuit of the compressor → discharge pipe 34 → first connection pipe 39 → outdoor coil → expansion valve → indoor coil → second connection pipe 40 → suction pipe 38 → compressor.

Next, when the electromagnetic coil 47 is energized (FIG. 3), the plunger 49 is attracted to the fixed iron core 46, and the slider 41 comes into contact with the lid 45 and stops. As a result, the slider 41 allows the outlet port 3eb and the second port ssb to communicate with each other, while the inlet port 34a and the first port 37b also communicate through the inside of the cylinder 33. Therefore, the refrigerant gas is transferred from the compressor to the discharge pipe 34 to the second connecting pipe 40-+indoor coil to the expansion valve to the outdoor coil to the first connecting pipe 39 to the suction pipe 38.
→This becomes the heating cycle circuit for the compressor.

As described above, according to this embodiment, there is a pair of valve seats whose seat surfaces are fixed in parallel in a cylinder, each having an outlet and a first and second port, and between the valve seats. A cylindrical slider with the same diameter and a differential pressure seal type slide seat ring inserted at both ends is installed to seal the inside and outside of the slider, and by sliding the slider in the cylinder axial direction, it communicates with the outlet. By selecting the vent and switching the refrigerant circuit, the slider is held at a neutral point without receiving a pressure difference, so the slide seat ring has a slight pressure that is sufficient to withstand the surface pressure necessary for sealing. It is possible to slide the slider by applying force, resulting in significant cost reduction, miniaturization, and improved reliability.

Effects of the Invention As described above, the present invention has a pair of valve seats whose seat surfaces are fixed in parallel in a cylinder, each having an outlet and a first and second port, and a space between the valve seats. A cylindrical slider is provided with a slide seat ring of the same diameter to seal the inside and outside of the slider, and by sliding the slider in the axial direction of the cylinder, a port communicating with the outlet is selectively selected. By adopting a configuration that switches the refrigerant circuit, the switching force required to slide the slider can be made extremely small, making it possible to switch the valve without using a pilot pulp mechanism as in the past, resulting in significant cost reductions. This allows for miniaturization and improved reliability.

[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 sectional view showing the heating state shown in Fig. 1, Fig. 4 is a sectional view showing the cooling state of a conventional four-way valve for a refrigeration cycle, and Fig. 5 is a sectional view showing the heating state shown in Fig. 4. FIG. 33...Cylinder, 36.37...Valve seat, 41...Slider, 42.43.
...Slide seat ring, 45... Drive source. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Diagram - JtvI floor t5.3 --- Cylinder J6 --- χ- Halde seat J6j - Guiding port 37 --- Kikuji Valve seat Jmu J7c... First, passage to T. Mouth 41-11 Person Live Figure 3 42
．． 4J・-Slide seat ring appearance・-JL group: Elephant 4th figure 5th figure

Claims (1)

[Claims] a cylinder forming a valve body and having an inlet; a pair of valve seats having an outlet fixed to the inner wall of the cylinder with their seat surfaces parallel to each other and first and second ports arranged in parallel in the axial direction; , a cylinder having slide seat rings of the same diameter at both ends that abut and seal the valve seat, and moves in the axial direction within the cylinder to selectively communicate the outlet port with the first or second communication port; 1. A four-way valve for a refrigeration cycle, comprising: a shaped slider; and a drive source for reciprocating the slider.