JPH08135842A - Valve device - Google Patents

Abstract

PURPOSE: To provide a valve device capable of quiet operation by effectively absorbing pulsation sound and damps it, even if flow control becomes unstable, causing pressure pulsation, resulting in the generation of pulsation sound. CONSTITUTION: A valve device is provided with a valve device body equipped with a chamber R, valve body 31 provided retractably in the chamber R, valve seat 32 provided in chamber R and equipped with a flow straightening passage 33, a first connection pipe Pa provided in the valve device body 20 so as to communicate the valve seat and flow straightening passage, and a second connection pipe Pb provided in the valve device body 20 so as to communicate with the chamber R, and in at least one component out of the components mentioned above, the valve seat 32, for example, a silent chamber S is provided. In addition, a communication passage Y is provided to communicate this silent chamber S and the chamber R of the valve device body 20, for example, one out of the chamber R of the valve device body 20, the flow straightening passage, the passages comprising a first connection pipe and second connection pipe.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a valve device which is, for example, an automatic expansion valve provided in a refrigeration cycle circuit of an air conditioner.

[0002]

2. Description of the Related Art There is a tendency that an air conditioner, which is so-called a multi-air conditioner and is capable of air-conditioning operation in multiple rooms simultaneously, is frequently used. The refrigeration cycle circuit is shown in FIG.
Here, 1 is a compressor, 2 is a four-way valve, 3 is an outdoor heat exchanger,
Liquid-side automatic expansion valves 4a and 4b, indoor heat exchangers 5a and 5b, and gas-side automatic expansion valves 6a and 6b are sequentially connected via a refrigerant pipe P to form a heat pump type refrigeration cycle. To be done. The plurality of indoor heat exchangers 5a,
5b is arranged in each of a plurality of air-conditioned rooms.

During the cooling operation, the refrigerant is introduced as shown by the solid line arrow, and during the heating operation, the refrigerant is introduced as shown by the broken line arrow in the figure. During the cooling operation, the liquid side automatic expansion valves 4a, 4b adjust the refrigerant flow rate in accordance with the instructed air conditioning load, and during the heating operation, the gas side automatic expansion valves 6a, 6b according to the instructed air conditioning load. Adjusts the aperture. In any operation, the indoor heat exchangers 5a and 5b can perform the optimum air conditioning action in each air-conditioned room.

Reference numeral 7 has one end connected to a refrigerant pipe between the outdoor heat exchanger 3 and the branch portions of the gas side automatic expansion valves 4a and 4b, and the liquid side automatic expansion valves 6a and 6b and the four-way valve 2 are connected. It is a bypass circuit in which the other end is connected to the refrigerant pipe between and, and the auxiliary capillary 8 and the first temperature sensor 9 are provided in the middle.

A second temperature sensor 10 is provided at the connecting portion of one of the gas side automatic expansion valves 6b. From the difference between the detected temperature and the detected temperature of the first temperature sensor 9, the refrigerant heating degree is determined. Control.

Reference numeral 11 is for guiding hot gas to the outdoor heat exchanger 3 in order to remove the frost adhered to the outdoor heat exchanger 3 during heating in order to remove the frost. It is a defrost circuit.

[0007]

As described above, the air conditioning load in each air-conditioned room is naturally different, and the opening degree of the automatic expansion valve is also different. Then, the opening degree of each automatic expansion valve is automatically adjusted according to the change of the air conditioning load.

In particular, when the opening degree of at least one of the two gas-side automatic expansion valves 6a and 6b provided here is adjusted and changed, the refrigerant is transiently gas-liquid at the inlet side of this valve. It becomes a two-phase flow state, and this state changes drastically.

Therefore, the flow rate control of the gas side automatic expansion valve becomes unstable and pressure pulsation occurs. Along with this, a pulsating sound is generated, and this pulsating sound is dissipated as noise in the air-conditioned room, impairing quiet operation.

The present invention has been made in view of the above circumstances, and an object of the present invention is to generate a pulsating sound even if a pulsating sound is generated due to pressure pulsation due to unstable flow rate control. An object of the present invention is to provide a valve device capable of efficiently absorbing and damping and performing quiet operation.

[0011]

In order to satisfy the above object, the valve device of the present invention is, in claim 1, characterized in that a valve main body having a chamber is provided, and the valve main body is provided with a valve body projecting forward and backward. A valve body, a valve seat provided in the valve body at a portion facing the valve body, the valve seat having a rectifying path, and a flow path connected to the valve body and communicating with the chamber.
And a second connection pipe that is connected to the valve body and communicates with the rectifying path of the valve seat, a muffler chamber provided in at least one of the component parts. And a communication passage communicating with either the chamber of the valve body, the rectifying passage of the valve seat, or the first and second connecting pipe passages.

According to a second aspect of the present invention, the sound deadening chamber according to the first aspect is recessed in the valve seat, the communication passage is provided in the valve seat, and the sound deadening chamber and the chamber of the valve body are connected to each other. It is characterized by communication.

According to a third aspect of the present invention, the muffler chamber according to the first aspect is recessed in the valve seat, the communication passage is provided in the valve seat, and the muffler chamber and the rectifying path of the valve seat are provided. It is characterized by communication.

According to a fourth aspect of the present invention, the sound deadening chambers of the second and third aspects are formed in the valve seat and the valve body in a recessed manner, and the sound deadening chambers are provided at positions communicating with each other. To do.

According to a fifth aspect of the present invention, the silencing chamber according to the first aspect is provided along an outer peripheral portion of one of the first connecting pipe and the second connecting pipe of the valve body, and the communicating passage is formed. It is characterized in that it is provided in the above-mentioned muffler chamber side connection pipe and connects the muffler chamber and the connection pipe flow path.

According to a sixth aspect of the present invention, the sound deadening chamber according to the first aspect is provided along an outer peripheral portion of a connection pipe of either the first connection pipe or the second connection pipe of the valve body, and the communication passage is formed. It is characterized in that it is provided in the valve body and connects the muffling chamber and the chamber chamber.

In claim 7, the muffling chamber according to claim 1 is provided in the valve body, and the communication passage is provided in the valve body, and connects the muffling chamber and a chamber of the valve body. It is characterized by

[0018]

The noise generated in the valve body is guided from the communication passage to the muffling chamber where it acts as a kind of resonance muffler to muffle noise.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. The valve device used in the present invention is an automatic expansion valve of a multi-room air conditioner called a multi-air conditioner, for example, as described above with reference to FIG.

The specific structure is shown in FIG. In the figure, reference numeral 20 denotes a valve body, and a valve drive portion 21 is mounted on the upper portion of the valve body 20 in the figure.

The valve drive unit 21 has a housing 22 mounted and fixed on the valve body 20, a stator 23 loosely inserted into the outer peripheral surface of the housing, and a rotor 24 loosely inserted into the inner peripheral surface of the housing. And a rotor 25 fitted to this rotor.

The rotating body 25 is screwed into the valve body 20 via the screw portion 26, and the rotor 24 and the rotating body 25 rotate integrally with the valve body 20 and the valve body 20 is fixed. It is designed to move up and down along the axis.

From the upper end surface of the rotating body 25 to the upper stopper 26a
Is provided in a projecting manner, and an L-shaped stopper receiver 27a is provided on the head of the housing 22 facing this. When the rotating body 25 moves upward and reaches a predetermined position, the upper stopper 26a
Comes into contact with the horizontal piece of the stopper receiver 27a, and the rotor 2
4 and the rotation of the rotating body 25 are restricted.

From the lower end surface of the rotating body 25 to the lower stopper 2
6b is provided in a protruding manner, and the rotating body 25 moves downward and reaches a predetermined position, the lower stopper abuts the lower portion of the housing 22,
The rotation of the rotor 24 and the rotating body 25 is restricted.

A valve rod guide hole 28 is provided along the axis of the valve body 20, and a valve rod 30 and a spring 29 for elastically urging the valve rod 30 downward are loosely inserted. The valve stem 30
Of the stopper ring 2
It is prevented from coming off by 9a.

The valve main body 20 on which the valve driving section 21 is mounted is provided with a chamber R which is a space communicating with the valve rod guide hole 28. And the valve stem 3
0 has its tip portion extended to the chamber R,
A valve element 31 is attached and fixed to the tip of the valve rod.

Needless to say, the valve body 31 moves up and down together with the valve rod 30, but the range of movement is limited to the chamber R. The valve body 31 has a base end portion formed in a hexagonal bolt shape, and a tip end portion 31a formed in a truncated tapered shape.

Further, a valve seat 32 is provided in the lower portion of the chamber R in the drawing. Actually, a female screw portion is provided in the lower portion of the valve body 20, and a valve seat 32 having a screw portion on the peripheral surface is screwed onto the female screw portion. Naturally, the axis of the valve seat 32 coincides with the axes of the valve rod 30 and the valve body 31.

A straightening passage 33 is provided in the valve seat 32 along the axis thereof. The rectifying passage 33 has a tapered hole shape in which the diameter gradually decreases from the upper end surface of the valve seat 32 to a lower portion with a certain distance, and the diameter gradually increases from the minimum diameter portion to the lower end surface. Make a state.

Refrigerant pipes Pa and Pb forming a refrigeration cycle are connected to the side and bottom of the valve body 20. Here, the refrigerant pipe connected to the side portion of the valve body is connected to the first connection pipe P.
a, a refrigerant pipe connected to the bottom of the valve body is a second connection pipe Pb
Called.

The first connection pipe Pa is communicated with the chamber R via a communication hole 34 provided on the side of the valve body 20. The second connecting pipe Pb is connected to the chamber R via a rectifying passage 33 formed in the valve seat 32 from a position where it is connected along the peripheral surface of the valve seat 32.

In addition to such a basic structure, the automatic expansion valve is provided with a silencer chamber and a communication passage as described below. As shown in FIG. 1 (A), the male screw portion 32a provided on the peripheral surface of the valve seat 32 is notched in a concave shape along the outer peripheral surface at a substantially middle portion thereof and is divided into upper and lower parts.

The recessed portion is formed with a depth dimension such that it does not extend from the outer peripheral surface of the valve seat 32 to the rectifying path 33, and the external thread 32a of the valve seat 32 is attached to the internal thread 20a of the valve body 20. In the screwed state, a closed space is formed between the valve body and the female screw portion 32a. This closed space is referred to as a sound deadening chamber S.

Further, the valve seat 32 is provided with a communication passage Y having one end opening into the muffler chamber S and the other end opening into the chamber R of the valve body 20. In addition, if it demonstrates, this communication path Y will connect the silencing chamber S and the chamber R.

In the automatic expansion valve configured as described above, the refrigerant is introduced into the chamber R of the valve body 20 from the first connecting pipe Pa, for example, during the refrigeration cycle operation,
Further, the second portion is provided through the gap between the valve body 31 and the valve seat rectifying path 33.
To the connecting pipe Pb.

Alternatively, on the contrary, the refrigerant is guided from the second connecting pipe Pb to the valve seat rectifying path 33, and further led to the chamber R through the gap between the valve body 31 and the first connecting pipe Pa. Be led to.

In any operation, the refrigerant is guided through the gap between the valve body truncated taper portion 31a and the valve seat rectifying path 33, and the amount of this gap electrically controls the valve drive portion 21. The flow rate of the refrigerant is adjusted accordingly, so that the refrigerant flow rate is optimally set.

Incidentally, the valve body truncated taper portion 31a abuts on the valve seat rectifying passage 33 to completely close the rectifying passage, and the valve rod 3
0 and the movement of the valve body 31 is restricted, the rotation and the downward movement of the rotating body 25 in the valve drive unit 21 are continued by the contraction of the spring 29 and the lower stopper 2
When the 6b comes into contact with the lower part of the housing 22, the rotating body 25
Will stop rotating.

As described above with reference to FIG. 5A, when the valve opening degree of at least one of the gas side automatic expansion valves 6a and 6b is changed and adjusted, the vapor-liquid refrigerant is transiently introduced into the inlet of this valve. The two-phase flow state changes, and pressure pulsation occurs inside the chamber R and inside the first and second connecting pipes Pa and Pb.

However, in the valve described with reference to FIG. 1A, this pressure pulsation is guided to the silencing chamber S via the communication passage Y. That is, the pressure pulsation causes the chamber R and the first and second
From the inside of the connecting pipes Pa and Pb of the above to the straight communication passage Y,
It communicates with this and is guided to a muffling chamber S having a predetermined closed volume.

Therefore, the silencing chamber S has a structure similar to the Helmholtz resonator, which is the simplest and most frequently used acoustic resonator. This resonator is composed of a closed space chamber (silence chamber) and a straight pipe (communication passage) having a predetermined length and a cross-sectional area which communicates with the space chamber, and reduces low-frequency sound, particularly noise of constant frequency. It works effectively.

The pressure pulsation is absorbed in the silencing chamber S, and the generation of pulsating sound is significantly attenuated. Quiet driving is maintained and the user's sense of trust is not impaired. FIG.
A sound deadening structure as shown in (B) may be adopted. In this case, not only the external thread part 32a of the valve seat 32 is missing in the muffling chamber S, but also the internal thread part 20a of the valve body 20 is partially missing to provide the muffling chamber Sa. .

Therefore, the silencing chamber S of the valve seat 32 and the silencing chamber Sa of the valve body 20 communicate with each other. Further, the valve seat 32 has a communication passage Y that connects the muffling chamber S and the chamber R.
Is provided in the same manner as described above.

With such a structure, the capacity of the silencing chamber S is increased to about twice as much as that described above, and thus the frequency range of noise to be attenuated is expanded, and a more effective silencing effect is obtained. To be

A sound deadening structure as shown in FIG. 2C may be adopted. In this case, the muffler chamber S has the male thread 3 of the valve seat 32.
There is no change in that part 2a is omitted.
A communication passage Ya is provided in the valve seat 32. That is, the communication passage Ya connects the silencing chamber S and the rectifying passage 33 provided in the valve seat 32.

With such a configuration, the specific frequency of the noise to be attenuated changes from the difference in the opening target position of the communication passage Ya as compared with the one described above, and the noise frequency with respect to that noise frequency is changed. An effective silencing effect is obtained.

A sound deadening structure as shown in FIG. 2D may be adopted. The silencing chamber Sb is provided at the connection portion of the second connection pipe Pb in the valve body 20. In other words, along the outer peripheral surface of the second connecting pipe Pb, the valve main body 20 site is recessed, which corresponds to the silencing chamber Sb.

The communication passage Yb is provided in the valve body 20 and connects the muffling chamber Sb and the valve body chamber R. With such a configuration, the position of the silencing chamber Sb is different and the communication passage Yb is different from that described above.
Since the total length of the noise varies, the specific frequency of the noise to be attenuated changes, and an effective silencing effect for that noise frequency is obtained.

A sound deadening structure as shown in FIG. 3 (E) may be adopted. The muffling chamber Sc is provided along the outer peripheral surface of the connection pipe, which is the second connection pipe Pb connection site in the valve body 20, as described above.

In this case, the capacity of the silencing chamber Sc is intentionally increased more than that described above to correspond to a specific frequency of noise to be attenuated. The communication passage Yc is directly provided in the second connection pipe Pb. Actually, the end portion of the second connecting pipe Pb is perforated, and the passage inside the connecting pipe and the muffling chamber Sc are provided so as to communicate with each other.

With such a configuration, compared with the one described above, the capacity of the muffling chamber Sc is different and the total length of the communication passage Yc is different, so that the specific frequency of the noise to be attenuated. It is changed and an effective silencing effect is obtained for the noise frequency.

A sound deadening structure as shown in FIG. 3 (F) may be adopted. The muffling chamber Sd is composed of a space portion formed in a protrusion 35 integrally provided on a side portion of the valve body 20. In addition, if it demonstrates, the said protrusion 35 will be provided so that the outer peripheral surface of the 1st connection pipe Pa may be enclosed and bent.

The communication passage Yd is provided with the first connecting pipe P.
It is provided directly on a. Actually, the end portion of the first connecting pipe Pa is perforated, and the passage inside the connecting pipe is provided so as to communicate with the silencing chamber Sd.

With such a configuration, the position and capacity of the silencing chamber Sd are different and the total length of the communication passage Yd is different from that described above, so that the noise to be attenuated is specified. The frequency changes and an effective silencing effect is obtained for the noise frequency.

A sound deadening structure as shown in FIG. 4G may be adopted. The muffling chamber Sd, like the one described above, is composed of a space inside the projection 35 integrally provided on the side of the valve body 20 so as to surround the outer peripheral surface of the first connecting pipe Pa.

The communication passage Ye is provided on the side of the valve body 20. Actually, a hole is formed on the side of the valve body 20 to connect the connection pipe channel and the silencing chamber Sd. With such a configuration, the specific frequency of the noise to be attenuated changes because the position and capacity of the muffling chamber Sd are different and the total length of the communication passage Ye is different as compared with the one described above. However, an effective silencing effect for the noise frequency can be obtained.

A sound deadening structure as shown in FIG. 4 (H) may be adopted. The muffling chamber Se is provided in the valve body 31. That is, the valve rod 30 is connected and fixed to the valve body 31,
The mounting hole 36 into which this valve rod is fitted is made longer.

Then, the valve rod 30 is inserted and fixed only in the upper portion of the mounting hole 36, and the lower portion of the mounting hole 36 is left as it is as a space chamber, which is referred to as a silencing chamber Se. Naturally, the communication passage Yf is provided in the valve body 31. Here, it extends horizontally from the muffling chamber Se and opens to the side surface of the valve body 31.

The side opening of the valve body 31 of the communication passage Yf is
Even when the valve body completely closes the valve seat rectifying path 33, it is located above the upper end of the valve seat 32 and is kept open.

With such a configuration, the specific frequency of the noise to be attenuated changes because the positions of the silencing chamber Se and the rectification path 33 are different from those described above, and the An effective silencing effect on the noise frequency is obtained.

[0061]

As described above, according to the present invention, at least one of the components is provided with a silencing chamber, the silencing chamber, the chamber of the valve body and the rectifying path of the valve seat, and Since the communication passage is provided that communicates with either one of the first and second connection pipe flow paths, even if a pulsating sound is generated due to the pressure pulsation, the muffling chamber and the communication path communicating with this are
This pulsating sound is efficiently absorbed and attenuated to enable quiet operation and improve reliability.

[Brief description of drawings]

FIG. 1A is an enlarged vertical sectional view of an essential part of a valve device, showing an embodiment of the present invention. (B) shows another embodiment,
The longitudinal cross-sectional view which expanded the valve apparatus main part.

FIG. 2 (C) is an enlarged vertical cross-sectional view of the main part of the valve device, showing still another embodiment. (D) is a longitudinal cross-sectional view showing an enlarged main part of the valve device, showing still another embodiment.

FIG. 3 (E) is an enlarged vertical sectional view of a main part of the valve device, showing still another embodiment. (F) is a longitudinal sectional view in which a valve device main part is enlarged, showing still another embodiment.

FIG. 4G is an enlarged vertical sectional view of a main part of the valve device, showing still another embodiment. (H) is a longitudinal sectional view in which a valve device main portion is enlarged, showing still another embodiment.

FIG. 5A is a refrigeration cycle configuration diagram of a multi-type air conditioner. (B) is a longitudinal sectional view of the automatic expansion valve.

[Explanation of symbols]

R ... Chamber chamber, 20 ... Valve body, 31 ... Valve body, 33 ... Rectification path, 32 ... Valve seat, Pa ... First connecting pipe, Pb ... Second connecting pipe, S, Sa to Se ... Silencer chamber, Y, Ya to Yf ... Communication passage.

Claims (7)

[Claims] 1. A valve main body having a chamber, a valve body projecting forward and backward from the chamber of the valve main body, and a rectifying path provided in the valve main body at a portion facing the valve body. A first connecting pipe provided with a valve seat, a flow passage connected to the valve body and communicating with the chamber, and a second connecting pipe connected to the valve body and communicating with a rectifying passage of the valve seat. A silencer chamber provided in at least one of the above components, the silencer chamber, the chamber chamber of the valve body, the rectifying path of the valve seat, and the first and second connections. A valve device comprising: a communication passage communicating with any one of the pipe flow paths. 2. The sound deadening chamber is formed in a recess in the valve seat, and the communication passage is provided in the valve seat to communicate the sound deadening chamber with a chamber of the valve body. The valve device according to Item 1. 3. The sound deadening chamber is formed in a recess in the valve seat, and the communication passage is provided in the valve seat to connect the sound deadening chamber and a rectifying passage of the valve seat. The valve device according to Item 1. 4. The valve device according to claim 2, wherein the muffling chamber is formed in a recess in the valve seat and the valve body, and the muffling chambers are provided at positions communicating with each other. . 5. The silencer chamber is provided along an outer peripheral portion of a connection pipe of either the first connection pipe or the second connection pipe of the valve body, and the communication passage is connected to the silencer chamber side connection pipe. The valve device according to claim 1, wherein the valve device is provided and connects the muffler chamber and the connection pipe channel. 6. The silencer chamber is provided along an outer peripheral portion of a connection pipe of either the first connection pipe or the second connection pipe of the valve body, and the communication passage is provided in the valve body, The valve device according to claim 1, wherein the muffling chamber and the chamber chamber communicate with each other. 7. The silencer chamber is provided in the valve body, and the communication passage is provided in the valve body to communicate the silencer chamber with the chamber of the valve body.
The valve device described.