JP2009222097A - Refrigerant circuit check valve and refrigerating cycle device equipped therewith - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a check valve with a valve element having improved vibration control performance for operating to open/close a refrigerant flow path without the need for an exclusive vibration control component. <P>SOLUTION: A hollow part 43A of an outside member 43 has a first diameter portion 43B, a second diameter portion 43C having a larger diameter than the first diameter portion, and a connection portion 43D for connecting the first diameter portion 43B to the second diameter portion 43C. The valve element 42 has a blade part 44 to be moved in the hollow part 43A along the inner peripheral face of the outside member hollow part 43A, as a guide face, and a solid seat part 45 formed integrally with the blade part 44 and shaped to be fitted to the connection portion 43D of the outside member 43. The blade part 44 has a plurality of guide plates 46 existing around the inner peripheral face of the outside member hollow part 43A and extending in the axial direction of the outside member hollow part. It has a hollow portion encircled by the plurality of guide plates 46 and/or spaces 47 formed between the plurality of adjacent guide plates 46. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a check valve used in a refrigerant circuit, and a refrigeration cycle apparatus such as an air conditioner or a refrigeration apparatus including the check valve.

  A check valve used in a refrigerant circuit is usually configured such that a valve element that opens and closes a refrigerant flow path is separated from the open / closed position by the pressure of the refrigerant, thereby allowing the refrigerant flow path to communicate with each other. is there. Therefore, since the valve body vibrates due to the pressure fluctuation of the refrigerant, a device for preventing the vibration has been conventionally performed. As such a check valve, a coil spring provided parallel to the refrigerant flow direction and a vibration-proof spring provided perpendicular to the refrigerant flow direction are provided. A check valve that performs vibration isolation in a horizontal direction and a vertical direction is known (for example, Patent Document 1).

JP 2006-200554 A

However, a configuration that separately includes components such as a coil spring and a vibration-proof spring complicates the structure and operation of the check valve, which is disadvantageous in terms of cost and reliability.
The present invention has been made in view of the above problems, and in a check valve used in a refrigerant circuit, without providing a special vibration isolation component, the vibration isolation of the valve element that opens and closes the refrigerant flow path is provided. An object is to propose an improved check valve and a refrigeration air conditioner equipped with the check valve.

According to the present invention, there is provided a hollow outer member connected to a refrigerant circuit pipe, and a hollow portion of the outer member, and the refrigerant circuit valve position of the outer member is determined according to the pressure of the refrigerant flowing in the hollow portion. A check valve that moves between the refrigerant circuit valve opening positions, and allows the refrigerant to pass through the hollow portion only in one direction through the periphery of the valve body,
The hollow portion of the outer member includes a first diameter portion, a second diameter portion having a larger diameter than the first diameter portion, and a connecting portion that connects the first diameter portion and the second diameter portion. And
The valve body is formed integrally with the blade portion, the blade portion moving in the axial direction of the hollow portion with the inner peripheral surface of the hollow portion of the outer member as a guide surface, and fitted into the connecting portion of the outer member. A solid sheet portion having a matching shape,
The blade portion has a plurality of guide plates around the inner peripheral surface of the outer member hollow portion and extending in the axial direction of the outer member hollow portion, and a portion surrounded by the plurality of guide plates is hollow. It is what has become.
A hollow outer member connected to a pipe of the refrigerant circuit; and a refrigerant circuit in a hollow portion of the outer member from a refrigerant circuit valve closing position of the outer member according to a pressure of the refrigerant flowing in the hollow portion. A check valve that moves between the valve open positions, and allows the refrigerant to pass through the hollow portion only in one direction through the periphery of the valve body,
The hollow portion of the outer member includes a first diameter portion, a second diameter portion having a larger diameter than the first diameter portion, and a connecting portion that connects the first diameter portion and the second diameter portion. And
The valve body is formed integrally with the blade portion, the blade portion moving in the axial direction of the hollow portion with the inner peripheral surface of the hollow portion of the outer member as a guide surface, and fitted into the connecting portion of the outer member. A solid sheet portion having a matching shape,
The blade portion has a plurality of guide plates that extend around the inner peripheral surface of the outer member hollow portion and extend in the axial direction of the outer member hollow portion, and a space is provided between the adjacent guide plates. Is formed.
Further, a hollow outer member connected to the piping of the refrigerant circuit, and a refrigerant circuit in the hollow portion of the outer member from the refrigerant circuit valve closing position of the outer member according to the pressure of the refrigerant flowing in the hollow portion A check valve that moves between the valve open positions, and allows the refrigerant to pass through the hollow portion only in one direction through the periphery of the valve body,
The hollow portion of the outer member includes a first diameter portion, a second diameter portion having a larger diameter than the first diameter portion, and a connecting portion that connects the first diameter portion and the second diameter portion. And
The valve body is formed integrally with the blade portion, the blade portion moving in the axial direction of the hollow portion with the inner peripheral surface of the hollow portion of the outer member as a guide surface, and fitted into the connecting portion of the outer member. A solid sheet portion having a matching shape,
The blade portion includes two wings at a point-symmetrical position with respect to the axial center thereof, and when the refrigerant passes through the outer peripheral surface of the valve body, the wing portion generates a levitation force on the valve body. Two blades are inclined in the same direction with respect to the flow direction of the refrigerant.

The valve body of the reversely supported valve according to the present invention includes a blade portion that acts as a guide and a seal portion that directly contributes to opening and closing of the refrigerant circuit. The blade portion has a plurality of guide plates that extend around the inner peripheral surface of the outer member hollow portion and extends in the axial direction of the outer member hollow portion, and a portion surrounded by the plurality of guide plates is hollow. In addition, since a space is formed between a plurality of adjacent guide plates, the mass of the valve body is reduced, and the refrigerant pressure that pushes up the valve body can be made larger than the mass of the valve body. Therefore, even when the air-conditioning load is variable, that is, when the flow rate of refrigerant flowing through the valve section decreases or when pressure fluctuations are caused by the pulsation of the compressor, the influence of the weight of the valve body is weakened, and the valve operation is stabilized and vibration noise Occurrence can be prevented or reduced. Further, the valve body itself can be prevented from being damaged by the impact of the vertical vibration of the valve body, and the reliability of the check valve is improved.
Further, the valve body of the reversely supported valve according to the present invention includes two blades at a point-symmetrical position with respect to the axial center thereof, and generates a levitation force on the valve body when the refrigerant passes through the outer peripheral surface of the valve body. These two blades are inclined in the same direction with respect to the flow direction of the refrigerant. For this reason, a lift is generated in a direction perpendicular to the flow of the refrigerant, and a damping effect is obtained by pressing the upper part of the valve body with the force, and vibration noise can be suppressed even when the valve body operation is unstable.

Embodiment 1 FIG.
1 is a configuration diagram of a refrigerant circuit of an air-conditioning apparatus according to Embodiment 1 of the present invention. The air conditioner shown in FIG. 1 is provided between a heat source unit 100A, a plurality of (in this case, three) indoor units 100C, 100D, and 100E connected in parallel, and the heat source unit 100A and each of the indoor units 100C to 100E. The repeater 100B is provided.
The heat source apparatus 100 </ b> A includes a compressor 1, a four-way valve 2, a heat source apparatus side heat exchanger 3, and an accumulator 4.
Each of the indoor units 100C to 100E includes first expansion devices 9c, 9d, and 9e, and usage-side heat exchangers 5c, 5d, and 5e, respectively.
The repeater 100B includes a first branch unit 10, a second branch unit 11, a gas-liquid separator 12, a second throttle device 13, a third throttle device 15, and a first heat exchanger. 16 and a second heat exchanger 17.

  One end of the use side heat exchangers 5c, 5d and 5e in the indoor units 100C to 100E and the first branch portion 10 in the relay unit 100B are connected by pipes 6c, 6d and 6e, and the interior units 100C to 100E The other end of the use side heat exchangers 5c, 5d, and 5e and the second branching portion 11 in the relay 100B are connected by pipes 7c, 7d, and 7e via first expansion devices 9c, 9d, and 9e. It is connected. Furthermore, 8a, 8b, 8c, 8d, 8e, and 8f are switching valves provided in the first branch portion 10, and the switching valves 8b, 8d, and 8f flow out of the gas refrigerant separated in the gas-liquid separator 12. The switching valves 8a, 8c, and 8e are provided in a circuit that connects the pipes 6c, 6d, and 6e and the pipe 6 to each other.

  The second branching section 11 connects the pipes 7c, 7d, and 7e to which the liquid refrigerant from the gas-liquid separator 12 flows out via the second throttling device 13. A first bypass circuit 14 branches from between the second expansion device 13 and the second branching unit 11 and is connected to the pipe 6 via the third expansion device 15. The first heat exchanger 16 is provided between the second expansion device 13 and the portion where the first bypass circuit 14 branches, and the liquid refrigerant flowing out from the second expansion device 13 and the first bypass Heat exchange is performed with the refrigerant flowing through the circuit 14. A second heat exchanger 17 is provided between the gas-liquid separator 12 and the second expansion device 13, and the refrigerant flowing out of the gas-liquid separator 12 and the refrigerant flowing through the first bypass circuit 14 are Heat exchange between them.

  On the other hand, four check valves 18, 19, 20, and 21 are provided in the refrigerant circuit in the heat source apparatus 100A. The check valve 18 is provided in the pipe 7 and allows the refrigerant to flow only from the heat source apparatus side heat exchanger 3 to the gas-liquid separator 12. The check valve 19 is provided in the pipe 6 and allows the refrigerant to flow only from the relay 100B to the four-way valve 2. The check valve 20 is provided in the second bypass circuit 32 that connects the pipe 6 and the pipe 7, and allows the refrigerant to flow only from the pipe 6 to the pipe 7. The check valve 21 is provided in the third bypass circuit 33 that connects the pipe 6 and the pipe 7, and allows the refrigerant to flow only from the pipe 6 to the pipe 7.

  The second bypass circuit 32 branches from the pipe 6 between the four-way valve 2 and the check valve 19, and joins the pipe 7 on the downstream side of the check valve 18 during the cooling main operation. The third bypass circuit 33 branches off from the pipe 6 on the upstream side of the check valve 19 during the cooling main operation, and joins the pipe 7 between the check valve 18 and the heat source apparatus side heat exchanger 3. The check valves 18 to 21 are provided for the purpose of switching the refrigerant flow, and the piping 6 is set to a low pressure and the piping 7 is set to a high pressure.

In the above air conditioner, the indoor units 100C to 100E may use only one of them, or may use two or all three at the same time. When only one indoor unit is used, the rotation of the compressor 1 is varied and the amount of refrigerant flowing through the refrigerant circuit is smaller than when three indoor units are used simultaneously.
In the air conditioner, various refrigerants such as R22, R407C, and R410A can be used.

Next, the configuration of the check valves 18 to 21 will be described. 2 and 3 are explanatory diagrams illustrating an example of a configuration related to the check valves 18 to 21. 2 shows an example in which the check valve is attached to the refrigerant pipe and is in a closed state, and FIG. 3 shows a configuration for reducing the weight of the valve body constituting the check valve in FIG. Yes.
As shown in FIG. 2, this check valve has a valve body 42 and an outer member 43. In other words, the outer member 43 connected to the pipes 40 and 41 of the refrigerant circuit and the refrigerant of the outer member 43 in the hollow portion 43A of the outer member 43 depending on the pressure of the refrigerant flowing in the hollow portion 43A. And a valve body 42 that moves between the circuit valve closing position and the refrigerant circuit valve opening position.

The hollow portion 43A of the outer member 43 includes a first diameter portion 43B, a second diameter portion 43C larger than the first diameter, and a connecting portion that connects the first diameter portion and the second diameter portion. 43D. The connecting portion 43D can have, for example, a tapered shape with an inclined surface.
The valve body 42 is formed integrally with the blade portion 44 and a cylindrical blade portion 44 that moves the hollow portion 43A in the axial direction using the inner peripheral surface of the hollow portion 43A of the outer member 43 as a guide surface. And a solid sheet portion 45 having a shape (for example, a slope shape) that fits into the connecting portion 43D of 43. The blade portion 44 has a plurality of (for example, four) guide plates 46 extending in the axial direction of the hollow portion 43 </ b> A of the outer member 43. The plurality of guide plates 46 are arranged around the inner peripheral surface of the outer member hollow portion 43 </ b> A, a space (or notch) 47 is formed between the adjacent guide plates 46, and the plurality of guide plates 46. The part surrounded by is hollow.

In the check valve having the above structure, the refrigerant flows in from the pipe 40 and pushes up the valve body 42 by the pressure. Thereby, the seat portion 45 of the valve body 42 fitted and abutted against the connecting portion 43D of the outer member 43 is pulled away, and the refrigerant flows downstream through the outer peripheral surface of the valve body 42 and the hollow portion 43A of the outer member 43, It is made to distribute | circulate to the connection piping 41 along the guide plate 46. FIG.
The “refrigerant circuit valve closing position of the outer member 43” described above corresponds to the connecting portion 43D of the outer member 43 and corresponds to the contact position with the seat portion 45 of the valve body 42, and “the refrigerant of the outer member 43”. The “circuit opening position” corresponds to a position where the contact is released and the refrigerant can pass.

  The portion between the adjacent guide plates 46 may have a closed shape as shown in FIG. 2, but as shown in FIG. It is preferable to further reduce the weight of the valve body 42 by reducing the height of the hollow portion inside the body 42. The reason is as follows.

FIG. 4 shows the relationship between the mass of the valve body 42 and the amount by which the valve body 42 is pushed up (lift amount) due to the refrigerant flow rate. In FIG. 4, the height “X” (corresponding to the height of the seal portion 45 of the valve body 42 shown in FIG. 3) that does not generate vibration noise during the operation of the valve body 42 shown in FIG. When the refrigerant flow rate is 60 (kg / h), the mass of the valve element 42 is about 2.0 g or less, and when the refrigerant flow rate is 80 (kg / h), the mass of the valve element 42 is 3.0 g or less, and the refrigerant flow rate is In the case of 100 (kg / h), the mass of the valve body 42 needs to be about 4.6 g or less, and in the case where the refrigerant flow rate is 120 (kg / h), the mass of the valve body 42 needs to be 7.0 g or less. Show. That is, if the valve body 42 is designed so that its mass is as small as possible, the force (static pressure) that pushes up the valve body 42 becomes larger than the dead weight of the valve body 42, and the valve body 42 is stabilized, so that vibration noise is generated. Less likely to occur. However, when the mass of the valve body 42 exceeds the above value, the static pressure applied to the valve body 42 changes abruptly when the refrigerant flow rate is smaller than a predetermined amount, so that the self-weight of the valve body 42 exceeds the static pressure. As a result, a force is applied in the valve closing direction, and vibration noise is easily generated.
When the valve body 42 is pushed up by the flow rate in the liquid refrigerant state, buoyancy is generated in the valve body 42, so that the static pressure on the valve body 42 becomes larger than in the case of the gas refrigerant state. Therefore, the mass of the valve body 42 may be determined based on the flow rate in the gas refrigerant state.

  When operating only one indoor unit 100C, since the compressor 1 varies the operating capacity, the push-up force (static pressure) applied to each valve body 42 of the check valves 18 to 21 is reduced. By adopting a configuration in which the mass is reduced as described above, the operation of the valve body 42 is stabilized, and generation of vibration noise can be prevented. Further, even if vibration noise is generated, it is less than in the prior art, so that it is possible to reduce unpleasant sound that propagates through the piping and enters the room. Moreover, the check valve does not increase the number of parts as compared with the conventional one and has an easy structure, which can contribute to cost reduction.

Embodiment 2. FIG.
FIG. 5: is (a) top view, (b) front view, (c) side view which shows the structure of the valve body of the non-return valve which concerns on Embodiment 2 of this invention. Only the valve body is different from the check valve shown in FIG. In the valve body 42 of the second embodiment, the blade portion 44 is provided with two blades 49 at a point-symmetrical position with respect to the center in the blade portion axial direction, and when the refrigerant passes through the outer peripheral surface of the valve body 42. The two blades 49 are inclined in the same direction with respect to the flow direction of the refrigerant so that a levitation force is generated in the valve body 42. In addition, although the blade 49 may be provided independently, it may be formed using the guide plate 46 of the first embodiment.

FIG. 6 is a diagram showing the relationship between the lift coefficient CL and the angle of attack α in a single wing. Although the lift coefficient CL increases with the angle of attack α, the lift coefficient CL decreases rapidly when the angle of attack α is approximately 12 °, although it varies depending on the shape of the leading edge of the wing and the plate thickness. This is because peeling occurs at the leading edge of the wing and stable lift cannot be obtained. Therefore, the inclination angle of the blades 49 is preferably 12 ° or less.
According to the check valve of the second embodiment, the vibration of the valve body 42 can be suppressed, and the same effect as the first embodiment can be obtained.

Embodiment 3 FIG.
The check valve according to Embodiment 3 of the present invention incorporates both the features of Embodiment 1 and Embodiment 2 with respect to its valve body 42. FIG. 7 is a view showing the structure of the valve element 42 according to the third embodiment of the present invention, in which (a) is a top view, (b) and (d) are side views, (c) is a front view, and (e). Represents a bottom view. And only the valve body is different from the check valve shown in FIG. That is, the valve body 42 of the third embodiment is also formed integrally with the blade portion 44 and the blade portion 44 that moves the hollow portion in the axial direction using the inner peripheral surface of the hollow portion 43A of the outer member 43 as a guide surface. And a solid sheet portion 45 having a sloped shape that fits into the connecting portion 43D of the outer member 43. The blade portion 44 has a plurality of guide plates 46 extending in the axial direction of the outer member hollow portion 43A, and the guide plates 46 are arranged around the inner peripheral surface of the outer member hollow portion 43A. A space 47 is formed between the plates 46, and a portion surrounded by the plurality of guide plates 46 is hollow.
Here, the blade portion 44 further includes two blades 49 at a point-symmetrical position with respect to the center in the axial direction, and a levitation force is generated in the valve body 42 when the refrigerant passes through the outer peripheral surface of the valve body 42. The two blades 49 are inclined in the same direction with respect to the refrigerant flow direction.
In order to facilitate understanding of the blade 49, a perspective view of the valve body 42 shown in FIG. 7 from two directions is shown in FIG.

  The check valve of the third embodiment has a structure in which the valve body 42 has a combination of the weight reduction structure of the first embodiment and the lift generating blades of the second embodiment. With respect to the prevention of vibration noise caused by the above operation, it is possible to achieve an effect equal to or greater than that of the first and second embodiments.

Embodiment 4 FIG.
Until now, the example which applied the check valve which concerns on embodiment of this invention to the air conditioning apparatus was seen, However, The check valve of this invention is the refrigerant | coolant of other apparatuses which comprise a refrigerating cycle, for example, a refrigerating apparatus It can also be used for circuits.
Moreover, when using a check valve in the refrigerant circuit which comprises a refrigerating cycle, not only the example like FIG. 1, the check valve of this invention can be utilized.

The refrigerant circuit block diagram of the air conditioning apparatus which concerns on embodiment of this invention. The figure which shows an example of the whole structure of the non-return valve by Embodiment 1 of this invention. The figure which shows an example of the structure of the valve body of the non-return valve by Embodiment 1 of this invention. The figure which shows the relationship between the mass of a valve body, and the lift amount of the valve body by a refrigerant | coolant flow rate. The figure which shows an example of the structure of the valve body of the non-return valve by Embodiment 2 of this invention. The figure which shows the relationship between the lift coefficient CL and the attack angle (alpha) in a single wing | blade. The figure which shows an example of the structure of the valve body of the non-return valve by Embodiment 3 of this invention. The perspective view from two directions of the valve body shown in FIG.

Explanation of symbols

  100A heat source machine, 100B relay machine, 100C-100E indoor unit, 1 compressor, 2 four-way valve, 3 heat source machine side heat exchanger, 4 accumulator, 5c-5e use side (indoor) heat exchanger, 6, 6c-6e Piping, 7, 7c to 7e Piping, 8a to 8f Switching valve, 9c to 9e First throttling device, 10 First branching portion, 11 Second branching portion, 12 Gas-liquid separator, 13 Second throttling device , 14 1st bypass circuit, 15 3rd expansion device, 16 1st heat exchanger, 17 2nd heat exchanger, 18-21 check valve, 32 2nd bypass circuit, 33 3rd bypass Circuit, 40, 41 Piping, 42 Valve body, 43 Outer body, 43A Hollow part of outer body, 43B First diameter part, 43C Second diameter part, 43D Connection part, 44 Blade part, 45 Seat part, 46 Guide Board, 47: Space or notch, 49 wings.

Claims (7)

A hollow outer member connected to a refrigerant circuit pipe, and a refrigerant circuit valve opening from a refrigerant circuit valve closing position of the outer member in a hollow portion of the outer member, according to a pressure of a refrigerant flowing in the hollow portion A check valve that allows the refrigerant to pass only in one direction through the periphery of the valve body,
The hollow portion of the outer member includes a first diameter portion, a second diameter portion having a larger diameter than the first diameter portion, and a connecting portion that connects the first diameter portion and the second diameter portion. And
The valve body is formed integrally with the blade portion, the blade portion moving in the axial direction of the hollow portion with the inner peripheral surface of the hollow portion of the outer member as a guide surface, and fitted into the connecting portion of the outer member. A solid sheet portion having a matching shape,
The blade portion has a plurality of guide plates around the inner peripheral surface of the outer member hollow portion and extending in the axial direction of the outer member hollow portion, and a portion surrounded by the plurality of guide plates is hollow. A check valve characterized by A hollow outer member connected to a refrigerant circuit pipe, and a refrigerant circuit valve opening from a refrigerant circuit valve closing position of the outer member in a hollow portion of the outer member, according to a pressure of a refrigerant flowing in the hollow portion A check valve that allows the refrigerant to pass only in one direction through the periphery of the valve body,
The hollow portion of the outer member includes a first diameter portion, a second diameter portion having a larger diameter than the first diameter portion, and a connecting portion that connects the first diameter portion and the second diameter portion. And
The valve body is formed integrally with the blade portion, the blade portion moving in the axial direction of the hollow portion with the inner peripheral surface of the hollow portion of the outer member as a guide surface, and fitted into the connecting portion of the outer member. A solid sheet portion having a matching shape,
The blade portion has a plurality of guide plates that extend around the inner peripheral surface of the outer member hollow portion and extend in the axial direction of the outer member hollow portion, and a space is provided between the adjacent guide plates. Is a check valve.   The check valve according to claim 1, wherein a space is formed between the plurality of adjacent guide plates.   The check valve according to any one of claims 1 to 3, wherein the blade portion includes four guide plates arranged at equal intervals.   The blade portion includes two wings at a point-symmetrical position with respect to the axial center thereof, and when the refrigerant passes through the outer peripheral surface of the valve body, the wing portion generates a levitation force on the valve body. The check valve according to claim 1, wherein the two blades are inclined in the same direction with respect to the flow direction of the refrigerant. A hollow outer member connected to a refrigerant circuit pipe, and a refrigerant circuit valve opening from a refrigerant circuit valve closing position of the outer member in a hollow portion of the outer member, according to a pressure of a refrigerant flowing in the hollow portion A check valve that allows the refrigerant to pass only in one direction through the periphery of the valve body,
The hollow portion of the outer member includes a first diameter portion, a second diameter portion having a larger diameter than the first diameter portion, and a connecting portion that connects the first diameter portion and the second diameter portion. And
The valve body is formed integrally with the blade portion, the blade portion moving in the axial direction of the hollow portion with the inner peripheral surface of the hollow portion of the outer member as a guide surface, and fitted into the connecting portion of the outer member. A solid sheet portion having a matching shape,
The blade portion includes two wings at a point-symmetrical position with respect to the axial center thereof, and when the refrigerant passes through the outer peripheral surface of the valve body, the wing portion generates a levitation force on the valve body. A check valve characterized in that two blades are inclined in the same direction with respect to the flow direction of the refrigerant.   A refrigeration cycle apparatus comprising the check valve according to any one of claims 1 to 6 in a refrigerant circuit of a refrigeration cycle.

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