JP3263360B2 - Four-way switching valve - Google Patents

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 of a pilot type used for switching a refrigerant circuit of a heat pump type air conditioner. And a piston disposed on both sides of the valve body and reciprocating the valve body, respectively, on the port side connected to the discharge side of the compressor, and on both sides of the piston. A space having a muffler function is provided between the two pistons, and a length between the two pistons is longer than a length required for reciprocating the valve body.

[0005] According to the four-way switching valve of the first aspect, a space having a muffler function provided between the two pistons is provided on the port side connected to the discharge side of the compressor.
It absorbs the pulsation of the refrigerant gas discharged from the compressor and reduces the vibration noise caused by the pulsation of the discharge pressure of the compressor. 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, the piping space can be made compact, and the cost of parts 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.

FIG. 1 is a sectional view of a pilot type four-way switching valve according to a first embodiment of the present invention.
The cylinder 2 is disposed in the cylinder 1 and a slide valve 3A, 3B of a U-shaped passage 2a slidable in the axial direction of the cylinder 1 is a rod extending on both sides of the slide valve 2 in the slide direction. Reference numerals 4A and 4B denote pistons fixed to the tips of the rods 3A and 3B. Seal members 5A, 5B and valve bodies 6A, 6B are attached to the pistons 4A, 4B on the side opposite to the rods 3A, 3B. 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. The ports B, C, and D are connected to the high-pressure pipe 12, the low-pressure pipe 13, and the high-pressure pipe 14, respectively.
Are connected to each other. 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. At the other end of the high pressure side pipe 11, a compressor (not shown)
Are connected.

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 set to be approximately twice as long as 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.

In the above embodiment, the pilot type and the direct acting type four-way switching valve have been described. However, the type of the four-way switching valve is not limited to this, and the four-way switching valve is connected to the port connected to the discharge side of the compressor. A four-way switching valve may be used as long as a space having a muffler function is provided between the two pistons, and the length between the two pistons is longer than the length required for reciprocating the valve body.

[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 of a pilot type used for switching a refrigerant circuit of a heat pump type air conditioner. A reciprocating valve body, and pistons respectively arranged on both sides of the valve body for reciprocating the valve body. A muffler is provided on a port side connected to a discharge side of the compressor and between the pistons. Provide a space with functions,
Since the length between the two pistons is longer than the length required for the reciprocating motion of the valve body, the space having the muffler function absorbs the pulsation of the refrigerant gas discharged from the compressor, and the By reducing the vibration noise caused by the pulsation of the discharge pressure and consolidating the function of the pulsation damping muffler and the function of the four-way switching valve, the pulsation damping muffler can be omitted, the piping space can be made compact, and the parts cost can be reduced. In addition to this, the space with the muffler function during the heating operation eliminates the vibration noise generated when the superheated gas from the compressor flows directly into the room, enabling quiet air conditioning operation and improving comfort it can.

[Brief description of the drawings]

FIG. 1 is a sectional view of a pilot type four-way switching valve according to an 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, 4
0 ... space.

Claims (1)

(57) [Claims] 1. A pilot type four-way switching valve used for switching a refrigerant circuit of a heat pump type air conditioner, a valve element (2) reciprocating along a straight line, and both sides of the valve element (2). And pistons (4A, 4B) for reciprocating the valve body (2), and the pistons (4A, 4B) on the port (A) side connected to the discharge side of the compressor. Space with muffler function between
(4) A four-way switching valve characterized in that the length between the pistons (4A, 4B) is longer than the length required for the reciprocating motion of the valve body (2).