JPH11294607A - Four way selector valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a four way selector valve having the muffling function capable of damping the pulsation of delivery pressure of a compressor without using a pressure pulsation clamping muffler, and capable of space saving and cost reducing. SOLUTION: A space 40 with the muffling function is provided on the side of a port A connected to the delivery side of a compressor for a four way selector valve 10 for use in switching a refrigerant circuit of a heat pump system air conditioner. By absorbing vibration of heated refrigerant gas from a high pressure side piping 11 connected to the delivery side of the compressor by means of the space 40, vibration sound on the indoor machine side, caused by the pulsation of the delivery pressure of the compressor especially when a heating system is operated, is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a four-way switching valve used for switching a refrigerant circuit of a heat pump type air conditioner.

[0002]

2. Description of the Related Art Conventionally, in a heat pump type air conditioner, pulsation of discharge pressure of a compressor generates vibration noise, and particularly, superheated gas from the compressor is directly transmitted to the indoor unit side. A pressure pulsation damping muffler is attached to the high pressure side pipe connected to the discharge side of the compressor to reduce the vibration noise on the indoor unit side that impairs the comfort during the flowing heating operation. However, since it is necessary to secure an extra space for arranging the high-pressure side pipe to which the pressure pulsation damping muffler is attached, there is a problem that the cost is increased due to the addition of the pressure pulsation damping muffler, contrary to space saving.

Accordingly, an object of the present invention is to provide a four-way switching valve having a muffler function capable of damping the pulsation of the discharge pressure of a compressor without using a pressure pulsation damping muffler, which can save space and reduce costs. To provide.

[0004]

According to a first aspect of the present invention, there is provided a four-way switching valve for switching a refrigerant circuit of a heat pump type air conditioner. It is characterized in that a space having a muffler function is provided on the port side connected to the side.

According to the four-way switching valve of the first aspect, the pulsation of the refrigerant gas discharged from the compressor is absorbed by the space having the muffler function on the port side connected to the discharge side of the compressor. In addition, the vibration noise caused by the pulsation of the discharge pressure of the compressor is reduced. Therefore, by integrating the function of the pulsation damping muffler and the function of the four-way switching valve, the pulsation damping muffler can be omitted and the piping space can be made compact,
Parts cost can be reduced. In particular, during the heating operation, the space having the muffler function of the four-way switching valve eliminates the vibration noise generated when the superheated gas from the compressor directly flows into the room, thereby improving comfort.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a four-way switching valve according to the present invention will be described in detail with reference to the illustrated embodiments.

(First Embodiment) FIG. 1 is a sectional view of a pilot type four-way switching valve according to a first embodiment of the present invention, wherein 1 is a cylinder whose both ends are closed by caps 7 and 2 is the cylinder 1 The slide valves 3A and 3B of the U-shaped passage 2a slidable in the axial direction of the cylinder 1 are rods extending on both sides of the slide valve 2 in the slide direction.
A and 4B are pistons fixed to the ends of the rods 3A and 3B. The rod 3A of each of the pistons 4A, 4B,
On the side opposite to 3B, sealing members 5A, 5B and valve bodies 6A, 6B
And are attached. The slide valve 2 slides on a slide base 8 disposed at a central portion in the cylinder 1, and ports B, C, and D are provided on the slide base 8 in the axial direction of the cylinder 1 in order from the cap 7A side. ing. One end of each of the high-pressure pipe 12, the low-pressure pipe 13, and the high-pressure pipe 14 is connected to the ports B, C, and D, respectively. Further, a port A is provided at a position facing the high pressure side pipe 12 of the cylinder 1, and one end of the high pressure side pipe 11 is connected to the port A. The discharge end of a compressor (not shown) is connected to the other end of the high-pressure side pipe 11.

The caps 7A and 7B are provided with ports E and F having valve seats 8A and 8B at positions facing the valve bodies 6A and 6B attached to the pistons 4A and 4B, respectively. , F are connected to one ends of pilot pipes 15, 17, respectively. The pilot tube 1
The other ends of 5, 17 are connected to ports a, b of pilot solenoid valve 20, respectively. The pilot solenoid valve 20 for switching the four-way switching valve 10 includes a valve body 21, a needle valve 22 disposed in the valve body 21, a plunger 23 connected to one end of the needle valve 22, And a coil 24 wound around the outside of the plunger 23. The plunger 23 is urged toward the valve body 21 by a spring (not shown). The common port c of the pilot solenoid valve 20 and the low-pressure side pipe 13 are connected via a pilot pipe 16. FIG. 1 shows a case where the coil 24 of the pilot solenoid valve 20 is not energized, in which the port a is open, communicates with the common port c, and the port b is closed.

The four-way switching valve 10 of the pilot type having the above-described structure.
In a state where the slide valve 2 in the cylinder 1 is located on the left side of FIG. (Not shown). Then, since the port b of the pilot solenoid valve 20 is opened to communicate with the common port c and the port a is closed, the space 42 between the piston 4B and the cap 7B is closed.
Is connected to the low-pressure side pipe 13 via the pilot pipe 17, the pilot solenoid valve 20, and the pilot pipe 16. At this time, the bleed hole provided in the piston 4B
(Not shown) or the outer peripheral surface of the sealing member 5B and the cylinder 1
The amount of refrigerant flowing from the space 42 to the low-pressure side pipe 13 via the pilot pipe 17, the pilot solenoid valve 20, and the pilot pipe 16 is set to be larger than the amount of refrigerant leaking from the space between the inner peripheral surface and the inner peripheral surface. The pressure in the space 42 becomes lower than the pressure in the space 41 between the piston 4A and the cap 7A, and the pressure difference generates a force for moving the slide valve 2 to the right. When the slide valve 2 moves to the right end, the valve element 6B attached to the piston 4B
Is in contact with the valve seat 8B, the port F is closed, and even if the pilot solenoid valve 20 is in the port b open state, the refrigerant gas is not bypassed through the pilot solenoid valve 20.
On the other hand, when switching in the opposite direction, the pilot solenoid valve 2
The energization of the 0 coil 24 is stopped to de-energize. Then, the plunger 23 is moved by the spring (not shown) to the valve body 2.
The slide valve 2 is moved back to the left side in the same manner.

In the four-way switching valve 10, the cylinder 1 is made longer than necessary in order to increase the volume of the space 40 between the pistons 4A and 4B in the cylinder 1.
That is, the length between the pistons 4A and 4B is about twice as long as the axial length of the slide valve 2 and the stroke (slightly larger than the outer diameter of the high pressure side pipes 12 and 14) in which the slide valve 2 moves. In this four-way switching valve 10, the length between the pistons 4A and 4B is further increased by about twice the stroke of the slide valve 2 to move. , And accordingly cylinder 1
The total length is also longer. Thus, the four-way switching valve 1
No. 0 enlarges the volume of the space 40 between the pistons 4A and 4B in the cylinder 1 with a minimum structural change. The expanded space 40 absorbs the vibration of the heated refrigerant gas from the high-pressure side pipe 11 connected to the discharge side of the compressor (not shown), and discharges the compressor particularly during the heating operation. The vibration noise of the indoor unit caused by the pressure pulsation is reduced. In the cooling operation, since the refrigerant is in a low pressure state after the phase change, no vibration occurs on the indoor unit side.

Therefore, a muffler function capable of attenuating the pulsation of the discharge pressure of the compressor without using a pressure pulsation attenuating muffler is provided, whereby space saving and cost reduction can be achieved. Also, especially during the heating operation, the four-way switching valve 10
By virtue of the space 40 having the muffler function, the vibration noise generated when the superheated gas from the compressor flows directly into the indoor unit can be eliminated, and the comfort can be improved.

(Second Embodiment) FIG. 2 is a schematic view of a direct-acting four-way switching valve according to a second embodiment of the present invention. Reference numeral 31 denotes a cylindrical cavity in which a rotary valve body 35 is housed. Part, 32
Is a speed reducer in which an output shaft (not shown) is connected to the rotation center of the rotary valve body 35, 33 is a case covering the speed reducer 32,
Reference numeral 34 denotes a DC (direct current) motor in which an output shaft (not shown) is connected to an input shaft (not shown) of the speed reducer 32. Ports G, H and J (only three are shown in FIG. 2) are provided at substantially 90 ° intervals in the circumferential direction on the lower bottom of the rotary valve body 35 in the hollow portion 31.
And one end of a high-pressure side pipe 36, an indoor unit side pipe 37, a low pressure side pipe 38, and an outdoor unit side pipe (not shown) are connected to the ports G, H, and J, respectively. The discharge side of a compressor (not shown) is connected to the other end of the high-pressure side pipe 36. Further, the rotary valve body 35 is provided with a passage 35 a for communicating one of the indoor unit side pipe 37 and the low pressure side pipe 38 with the low pressure side pipe 38.

In the direct-acting four-way switching valve 30 having the above configuration, when the DC motor 34 is rotated, the DC motor 3
4, the rotation of the output shaft is reduced through the speed reducer 32,
The rotary valve body 35 is rotated. The forward / reverse rotation of the DC motor 34 causes the rotary valve body 35 to reciprocate within a range of approximately 90 °, so that the adjacent indoor unit side pipe 37 and low pressure side pipe 38 communicate with the passage 35 a of the rotary valve body 35. Or the adjacent low pressure side pipe 38 and the outdoor unit side pipe communicate with each other through the passage 35 a of the rotary valve body 35.
When the adjacent indoor unit side pipe 37 and low pressure side pipe 38 communicate with each other via the passage 35a of the rotary valve body 35,
High-pressure side pipe 36 to which the discharge side of a compressor (not shown) is connected
Is connected to the outdoor unit side pipe (not shown) via the space 50 in the hollow portion 31 and the adjacent low pressure side pipe 38 and the outdoor unit side pipe communicate with each other via the passage 35 a of the rotary valve body 35. The high pressure side pipe 36 is connected to the indoor unit side pipe 37 via the space 50 in the cavity 31. Therefore, the high pressure side pipe 36 connected to the port G is always connected to the indoor unit side pipe 37 or the outdoor unit side pipe via the space 50.

The direct-acting four-way switching valve 30 has a cavity 3
1 is larger than necessary to accommodate the rotary valve body 35, and the cavity 31 is formed with a minimum structural change.
The volume of the space 50 inside is enlarged. The expanded space 50 absorbs the vibration of the superheated gas from the high pressure pipe 36 connected to the discharge side of the compressor (not shown), and pulsates the discharge pressure of the compressor particularly during the heating operation. The vibration noise of the indoor unit caused by the above is reduced.

Therefore, a four-way switching valve having a muffler function capable of attenuating the pulsation of the discharge pressure of the compressor without using a pressure pulsation damping muffler, and realizing space saving and cost reduction can be realized. Also, particularly during the heating operation, the space 5 having the muffler function of the four-way switching valve 30 is provided.
With 0, vibration noise generated when the superheated gas from the compressor directly flows into the indoor unit can be eliminated, and comfort can be improved.

In the first and second embodiments, the pilot-type and direct-acting four-way switching valve have been described. However, the type of the four-way switching valve is not limited to this, and is connected to the discharge side of the compressor. Any four-way switching valve provided with a space having a muffler function on the port side may be used.

[0017]

As is apparent from the above description, the four-way switching valve according to the first aspect of the present invention is a four-way switching valve used for switching the refrigerant circuit of a heat pump type air conditioner, which is located on the discharge side of the compressor. Since a space having a muffler function is provided on the connected port side, the space having the muffler function absorbs the pulsation of the refrigerant gas discharged from the compressor, and the vibration caused by the pulsation of the discharge pressure of the compressor. By reducing the noise and consolidating the functions of the pulsation damping muffler and the four-way switching valve, the pulsation damping muffler can be omitted, the piping space can be made compact, and the cost of parts can be reduced. Occasionally, the space having the muffler function eliminates the vibration noise generated when the superheated gas from the compressor flows directly into the room, and allows quiet air-conditioning operation. It can improve the sex.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pilot four-way switching valve according to a first embodiment of the present invention.

FIG. 2 is a schematic view of a direct-acting four-way switching valve according to a second embodiment of the present invention.

[Explanation of symbols]

1 ... cylinder, 2 ... slide valve, 3A, 3B ... rod,
4A, 4B: piston, 5A, 5B: sealing member, 6A,
6B: valve body, 7A, 7B: cap, 8: slide base,
9 bleed hole, 10 four-way switching valve, 11 high-pressure side piping, 12, 14 high-pressure side piping, 13 low-pressure side piping, 1
5 to 17: pilot pipe, 20: pilot solenoid valve, 5
1-53 space.

Claims (1)

[Claims] In a four-way switching valve used for switching a refrigerant circuit of a heat pump type air conditioner, a space having a muffler function is provided on a port (A, G) side connected to a discharge side of a compressor. 50) A four-way switching valve characterized in that: