JP2015152204A - Refrigeration cycle device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigeration cycle device capable of improving reliability by suppressing abrasion of a valving element of a check valve disposed at the outlet side of a cyclone-type oil separator.SOLUTION: A refrigeration cycle device includes: a compressor 1; a cyclone-type oil separator disposed at the outlet side of the compressor and separating an oil from a compressed refrigerant gas; and a check valve 3 disposed at the outlet side of the cyclone type oil separator. A rectifier 2 for decreasing a swirling flow velocity of swirl flow discharged from the cyclone type oil separator, is disposed between the cyclone type oil separator and the check valve.

Description

  The present invention relates to a refrigeration cycle apparatus such as an air conditioner, a chiller unit, or a refrigerator, and in particular, a refrigeration cycle apparatus including a cyclonic oil separator that separates oil (refrigerant oil) from refrigerant gas discharged from a compressor. About.

  Some refrigeration cycle apparatuses such as air conditioners use a screw compressor integrally provided with a cyclone type oil separator, for example, those described in Japanese Patent Application Laid-Open No. 2004-232625 (Patent Document 1). Are known.

  The screw compressor is provided with a substantially cylindrical vertical cyclone type oil separator to reduce the amount of oil going up (the amount of oil flowing out of the compressor) of the compressor. This cyclone type oil separator attaches oil to the wall surface by centrifugal force induced by the swirling flow in the separation space, and the oil descends while rotating along the inner wall, and is stored in the oil sump provided at the lower part. It has become. The refrigerant gas from which the oil has been separated is discharged from the top of the cyclonic oil separator and supplied to the refrigeration cycle.

JP 2004-232669 A

  Conventionally, in a refrigeration cycle apparatus provided with a cyclonic oil separator as described in Patent Document 1 described above, a check valve is provided on the discharge side of the cyclonic oil separator, and compression is performed via the check valve. In addition, by configuring the refrigerant gas to be sent out to the condenser side of the refrigeration cycle, the reverse flow of the refrigerant gas can be prevented. As the check valve, a lift type check valve is often used for a high flow rate valve such as a screw compressor.

  By providing the lift type check valve, the valve body of the check valve is lifted and opened by the compressed refrigerant gas discharged from the cyclone type oil separator. Also, when the pressure in the oil separator becomes smaller than the pressure downstream of the check valve due to the stop of the compressor, etc., the valve body drops downward and is seated on the valve seat, thereby closing the valve and backflow of the refrigerant gas. Is configured to prevent.

A retaining ring for restricting the ascending position of the valve body is provided on the inner surface of the cylinder on which the valve body slides.
However, in the cyclonic oil separator, the refrigerant gas and the refrigerating machine oil are separated by centrifugal force, so that a swirl flow is generated, and the swirl flow is provided on the outlet side of the cyclone oil separator. Flows into the check valve. For this reason, the valve body of the lift type check valve rises while rotating and comes into contact with the retaining ring, and the raised position of the valve body is regulated, but the valve body is rotated by the swirling flow. It has been found that the valve body wears due to sliding with the retaining ring, and that the worn valve body interferes with the retaining ring, causing problems such as malfunction of the check valve.

  An object of the present invention is to obtain a refrigeration cycle apparatus capable of improving reliability by suppressing wear of a valve body of a check valve provided on the outlet side of a cyclonic oil separator.

  To achieve the above object, the present invention provides a compressor, a cyclonic oil separator provided on the outlet side of the compressor, for separating oil from the compressed refrigerant gas, and an outlet of the cyclonic oil separator In the refrigeration cycle apparatus provided with a check valve provided on the side, for reducing the swirling flow velocity of the swirling flow discharged from the cyclone oil separator between the cyclone oil separator and the check valve A rectifier is provided.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect by which the abrasion of the valve body of the non-return valve provided in the exit side of a cyclone type oil separator can be suppressed, and the refrigerating cycle apparatus which can improve reliability is obtained.

It is a refrigeration cycle system diagram showing Example 1 of the refrigeration cycle apparatus of the present invention. It is explanatory drawing explaining the relationship and those structures of the compressor shown in FIG. 1, a rectifier, and a lift type check valve. It is a perspective view explaining the assembly structure of the compressor shown in FIG.1 and FIG.2, a rectifier, and a lift type check valve. It is a perspective view which shows the 1st example of the rectifier shown in FIGS. It is a perspective view which shows the 2nd example of the rectifier shown in FIGS. It is a perspective view which shows the 3rd example of the rectifier shown in FIGS. It is a perspective view which shows the 4th example of the rectifier shown in FIGS. It is a perspective view which shows the 5th example of the rectifier shown in FIGS. It is a perspective view which shows the 6th example of the rectifier shown in FIGS. It is a perspective view which shows the 7th example of the rectifier shown in FIGS.

  Hereinafter, specific examples of the refrigeration cycle apparatus of the present invention will be described with reference to the drawings. In each figure, the part which attached | subjected the same code | symbol has shown the part which is the same or it corresponds.

  FIG. 1 is a refrigeration cycle system diagram showing Embodiment 1 of the refrigeration cycle apparatus of the present invention. A present Example demonstrates the case where it is an air conditioner as a refrigerating-cycle apparatus.

  In FIG. 1, reference numeral 1 denotes a compressor, and in this embodiment, a screw compressor provided integrally with a cyclonic oil separator is used. A lift type check valve 3 is provided on the discharge side of the compressor 1 via a rectifier 2. 4 is a heat source side heat exchanger, 5 is a pressure reducing device such as an electronic expansion valve, and 6 is a use side heat exchanger 6. Reference numeral 7 denotes a blower for supplying outdoor air to the heat source side heat exchanger 4.

  The high-temperature and high-pressure refrigerant gas compressed by the compressor 1 is discharged from the oil separator after the oil is separated by a cyclone-type oil separator, and the high-temperature and high-pressure refrigerant gas includes the rectifier 2 and the lift type check valve. After passing through 3, it flows into the heat source side heat exchanger 4. In the heat source side heat exchanger 4, the heat is exchanged with the outdoor air blown from the blower 7 to condense, and after that, the decompression device 5 decompresses and expands to form a gas-liquid two-phase flow, thereby the use side heat exchange. Flows into the vessel 6. In the use side heat exchanger 6, a refrigeration cycle is performed in which heat is exchanged with cold water supplied in a circulating manner to lower the temperature of the cold water, the refrigerant evaporates into refrigerant gas, and is sucked into the compressor 1 again. Configure.

  Next, referring to FIG. 2, the relationship between the compressor 1, the rectifier 2, and the lift check valve 3 shown in FIG.

  In FIG. 2, 1 is a compressor, 8 is a cyclone oil separator integrally formed with the compressor 1, 9 is an oil sump provided below the cyclone oil separator 8, and 10 is a screw rotor. A main casing that houses the compression mechanism section, 11 is a motor casing that houses a motor for driving the compression mechanism section, 12 is provided with a discharge port, a piston that drives a slide valve, a bearing that supports a screw rotor, and the like. The discharge casing. Reference numeral 13 denotes a suction port to the compressor 1. Refrigerant gas from the refrigeration cycle is sucked from the suction port 13, and after cooling the motor housed in the motor casing 11, The compressor 1 is configured so as to be compressed by the compression mechanism portion provided in the compressor.

  In the present embodiment, a lift type check valve 3 is attached to the outlet side of the cyclonic oil separator 8 via a rectifier 2. The rectifying device 2 is provided with a rectifying member 2a as shown in FIG. The lift type check valve 3 opens when the valve body 3a is lifted by the compressed refrigerant gas discharged from the cyclone oil separator 8. Further, when the pressure in the oil separator 8 becomes smaller than the pressure downstream of the check valve 3 due to the stop of the compressor 1 or the like, the valve body 3a falls downward and is seated on the valve seat 3b to close the valve. . By providing such a lift type check valve 3, it is configured to prevent the backflow of the refrigerant gas.

  Further, a retaining ring 3d for limiting the ascending position of the valve body 3a is provided on the inner surface of the cylinder 3c on which the valve body 3a slides.

  As indicated by a thin dotted line arrow A, the high-temperature and high-pressure refrigerant gas compressed and discharged by the compression mechanism portion of the compressor 1 flows into the cyclone oil separator 8 and becomes a swirling flow. That is, the mixture of the refrigerant gas and the oil flows into the cylindrical inner wall of the oil separator 8 and flows along the cylindrical inner wall to form a swirling flow. As the mixture of the refrigerant gas and the oil turns into a swirl flow, the oil in the refrigerant gas is separated from the refrigerant gas by a centrifugal separation action, and the separated oil is a cylindrical inner wall as shown by a thick dotted arrow B. And then flows downward and accumulates in the oil sump 9. In addition, the refrigerant gas from which the oil has been separated (only the refrigerant gas or the refrigerant gas having a small amount of oil) is discharged from the upper part of the cyclone type oil separator 8 as a swirling flow.

  The lift type check valve 3 is provided on the downstream side of the cyclone type oil separator 8, but the conventional refrigeration cycle apparatus is not provided with the rectifier 2 as in the present embodiment. For this reason, the refrigerant gas discharged from the cyclonic oil separator 8 is a high-pressure swirl flow, and pushes up the valve body 3 a of the lift check valve 3. Since a high-pressure swirling flow acts on the valve body 3a, the refrigerant gas rotates while pushing up the valve body 3a, and the valve body 3a slides against the upper retaining ring 3d while rotating. For this reason, it is found that the valve body 3a wears due to sliding with the retaining ring 3d, and the worn valve body interferes with the retaining ring 3d, causing problems such as malfunction of the check valve 3. It was.

  Further, when the valve body 3a wears, the wear powder (iron powder) flows out into the refrigeration cycle, and flows into the decompression device 5 such as an electronic expansion valve provided on the downstream side. There is also a danger that the operation of the decompression device 5 may be caused due to the occurrence of biting. In this embodiment, a refrigeration cycle apparatus that does not include a four-way valve is taken as an example. However, if a four-way valve is provided, wear powder flows into the sliding portion of the four-way valve, causing malfunction of the four-way valve. There is also danger. Further, it has been found that if the wear powder flows into the heat exchangers 2 and 6 and accumulates, there is a risk that the heat exchange performance is deteriorated or the refrigerant flow path is clogged.

  Therefore, in this embodiment, a rectifier 2 is provided between the compressor 1 and the lift check valve 3. The rectifying device 2 rectifies the swirling flow discharged from the cyclonic oil separator 8 so as to make a straight flow or a flow close to a straight flow. That is, the refrigerant gas flow is corrected and the swirl component of the flow at the check valve 3 inlet is removed, or the swirl flow velocity is decelerated, and the refrigerant gas flows into the lift type check valve 3. Yes. Accordingly, the valve body 3a can be raised while preventing or suppressing the rotation of the valve body 3a, and the check valve 3 can be opened to deliver the high-temperature and high-pressure refrigerant gas to the refrigeration cycle. it can.

  FIG. 3 is a perspective view illustrating an assembly structure of the compressor 1, the rectifier 2, and the lift check valve 3 shown in FIGS. In FIG. 3, reference numeral 14 denotes a bracket connected to the refrigerant pipe 15. A bolt is passed through a bolt hole provided in the bracket 14 and a bolt hole 23 provided in the rectifying device 2, and the bolt is passed through the cyclone oil. It is screwed into a screw hole provided in a disk part on the upper side of the separator 8. Thereby, the said rectifier 2 and the said lift type non-return valve 3 can be collectively pressed and fixed to the upper part of the said separator 8 with the said bracket 14. FIG. That is, the lift check valve 3 can be attached to the oil separator 8 together with the lift check valve 3 by being sandwiched between the rectifier 2 and the bracket 14. The rectifying device 2 and the lift check valve 3 can be compactly integrated and fixed and installed on the outlet side of the cyclone oil separator 8.

  In the rectifying device 2, as shown in an enlarged view in FIG. 3, a flow path 22 is formed in a rectangular thick plate member 21, and a cross-shaped rectifying member (partition plate or rectifying plate) 2a is formed in the flow path 22. Is provided. In addition, 23 is the bolt hole mentioned above, The bracket 14, the check valve 3, and the rectifier 2 can be integrally attached to the upper part of the cyclone type oil separator 8 by the bolt which penetrates this bolt hole 3.

  Refrigerant gas from the use side heat exchanger 6 (see FIG. 1) of the refrigeration cycle is drawn into the compressor through the suction port 13 of the compressor 1 and compressed as indicated by a dotted arrow C, and then the cyclonic oil separator. After the oil is separated at 8, the oil is discharged from the oil separator 8 in a swirling state and enters the rectifier 2. Here, the flow is rectified by the flow straightening member 2 a and flows into the straight flow or a flow close to a straight flow and flows into the lift check valve 3. By pushing up the valve body 3 a of the check valve 3 with the pressure of the refrigerant gas, the refrigerant is sent to the heat source side heat exchanger 4 on the downstream side through the refrigerant pipe 15 as indicated by a dotted arrow D.

  In this embodiment, the rectifier 2 and the check valve 3 are separately manufactured, integrated with bolts, and installed on the outlet side of the cyclonic oil separator 8. The rectifying device 2 may be integrated on the side, and in this way, the number of parts can be reduced and assembly can be performed more easily. Alternatively, the rectifying device 2 may be integrated into the outlet portion of the cyclonic oil separator 8. Further, the rectifying device 2 and the check valve 3 may be integrated into the outlet portion of the cyclonic oil separator 8.

The rectifying device 2 can be selected and adopted, for example, the rectifying device 2 having a structure considered to be optimum shown in FIGS. 4 to 10 in consideration of the rectifying effect, pressure loss, manufacturing cost, strength, and the like. .
4-10, illustration is abbreviate | omitted about the rectangular board | plate material 21 (refer FIG. 3) which comprises the rectifier 2, and only the part of the flow path 22 shown in FIG. 3 is shown in figure.

FIG. 4 is a perspective view showing a first example of the rectifying device 2 in the rectifying device 2 used in FIGS. This rectifying device 2 is an example in which a rectifying member 2 a configured by a cross-shaped partition plate (rectifying plate) is provided in the flow path 22. By dividing the flow path 22 into four by this cross-shaped partition plate, the swirl flow can be made to flow straight or flow close to straight flow and flow into the lift check valve 3.
This example is the most common rectifying member 2a, which can be easily manufactured, has a high rectifying effect, and has a small pressure loss.

  Instead of the rectifying member 2a using the cross-shaped partition plate shown in FIG. 4, a rectifying member as shown in the following FIGS. 5 to 10 may be used. 5 to 10, the same reference numerals as those in FIG. 4 are the same or corresponding parts, and the description of the same parts will be omitted and different parts will be mainly described.

FIG. 5 is a perspective view showing a second example of the rectifier 2 shown in FIGS. In the second example, as the rectifying device 2, a rectifying member 2 a configured by a Y-shaped partition plate (rectifying plate) is provided in the flow path 22. By dividing the flow path 22 into three parts by this Y-shaped partition plate, the swirl flow can be made to flow straight or flow close to straight flow and flow into the lift check valve 3.
According to this example, since the number of partition plates is smaller than that in FIG. 4, the pressure loss caused when the refrigerant gas passes can be suppressed to be smaller than that in FIG.

FIG. 6 is a perspective view showing a third example of the rectifying device 2 shown in FIGS. In this third example, the flow straightening device 2 is provided with a flow straightening member 2a formed of a single partition plate (flow straightening plate) as the flow straightening device 2. By dividing the flow path 22 into two by this single-plate partition plate, the swirl flow can be made to flow almost like a straight flow and flow into the lift type check valve 3.
According to this example, since the number of partition plates is smaller than that in FIG. 5 described above, the pressure loss can be further reduced, and the manufacturing is easy and can be manufactured at a lower cost.

FIG. 7 is a perspective view showing a fourth example of the rectifying device 2 shown in FIGS. In the fourth example, as the rectifying device 2, a rectifying member 2 b configured by a grid-like partition plate is provided in the flow path 22. By dividing the flow path 22 into a large number by this grid-like partition plate, the swirl flow can be made to flow straight or flow closer to the straight flow and flow into the lift check valve 3.
According to this example, since the number of partition plates increases as compared with those shown in FIGS. 4 to 6, there is an effect that the rectifying effect can be further improved.

FIG. 8 is a perspective view showing a fifth example of the rectifier 2 shown in FIGS. In the fifth example, the flow straightening device 2 is provided with a flow straightening member 2b formed of a polygonal partition plate as the flow straightening device 2. By dividing the flow path 22 into a large number by this polygonal partition plate, the swirl flow can be made to flow straight or flow closer to the straight flow and flow into the lift check valve 3.
According to this example, more contact portions between the partition plates can be obtained than those in FIG. 7, so that the strength of the rectifying member 2 b can be further improved.

  In the examples described above with reference to FIGS. 4 to 8, by using partition plates as the rectifying members 2a and 2b, the flow path is divided into n parts so that the swirling component of the swirling flow is removed or the swirling flow velocity is reduced. However, the rectifying member is not limited to one using a partition plate. Hereinafter, an example in which the rectifying member is made of a material other than the partition plate will be described.

FIG. 9 is a perspective view showing a sixth example of the rectifier 2 shown in FIGS. In the sixth example, as the rectifying device 2, a rectifying member 2c made of a net is provided in the flow path 22. By providing the flow straightening member 2 c formed of this net in the flow path 22, the swirling flow flowing into the flow path 22 can be flowed and flowed into the lift check valve 3.
According to this example, since the rectifying member 2c is composed of a net, it is very easy to obtain the rectifying member 2c. By selecting the mesh opening ratio of the net, a high rectifying effect, a low pressure loss, etc. Thus, it is possible to obtain the rectifying member 2c that provides different effects.

FIG. 10 is a perspective view showing a seventh example of the rectifier 2 shown in FIGS. In the seventh example, as the rectifying device 2, a rectifying member 2d configured by a plate having a plurality of round holes in the flow path 22 is provided. By providing the flow straightening member 2d composed of a plate with a plurality of round holes in the flow path 22, the swirling flow flowing into the flow path 22 is rectified and flowed into the lift check valve 3 Can do.
According to this example, similar to the sixth example shown in FIG. 9 above, by selecting the aperture ratio of the plate with a plurality of round holes, it is different such as one with high rectification effect, one with low pressure loss, etc. The flow regulating member 2d that brings about an effect can be obtained.

  As described above, according to this embodiment described above, the refrigerant gas discharged from the discharge portion of the cyclonic oil separator 8 in which the valve body 3a of the lift type check valve 3 is provided integrally with the compressor 1. Can be made to flow into the lift type check valve 3 as a straight flow or a flow closer to the straight flow. Accordingly, it is possible to obtain an air conditioner that can suppress the valve body 3a of the check valve 3 from rotating and sliding and wearing with the cylinder 3c and the retaining ring 3d.

As a result, the life of the lift type check valve 3 can be extended, and wear powder generated by wear of the valve body 3a flows into the pressure reducing device 5 on the downstream side of the check valve 3 and is bitten. It is possible to prevent malfunctions caused by the above, or to flow into the heat exchangers 4 and 6 to cause clogging of the flow path, and as a result, it is possible to improve the reliability of the entire refrigeration cycle apparatus. .
Moreover, according to the Example mentioned above, there exists an effect which can select and employ | adopt an appropriate thing as a rectification | straightening member of the rectification | straightening apparatus 2, considering a rectification effect, a pressure loss, manufacturing cost, intensity | strength, etc.

  In addition, this invention is not limited to an above-described Example, Various modifications are included. For example, although the example which uses the screw compressor as the compressor 1 was demonstrated in the said Example, the compressor 1 is not restricted to a screw compressor, Other types of compressors may be sufficient and a cyclone type | formula is used. The oil separator 8 is not limited to the one integrated with the compressor, and the present invention can be similarly applied as long as the check valve 3 is provided downstream of the cyclonic oil separator 8.

  Further, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

1: Compressor (screw compressor),
2: Rectifying device, 2a, 2b, 2c, 2d: Rectifying member,
3: lift type check valve, 3a: valve body, 3b: valve seat, 3c: cylinder, 3d: retaining ring,
4: heat source side heat exchanger, 5: decompression device, 6: use side heat exchanger, 7: blower,
8: Cyclone oil separator, 9: Oil sump,
10: main casing, 11: motor casing, 12: discharge casing,
13: suction port, 14: bracket, 15: refrigerant piping,
21: plate material, 22: flow path, 23: bolt hole.

Claims (10)

A compressor, a cyclone oil separator provided on the outlet side of the compressor for separating oil from the compressed refrigerant gas, and a check valve provided on the outlet side of the cyclone oil separator In the refrigeration cycle device,
A refrigeration cycle apparatus comprising a rectifier for reducing a swirling flow velocity of a swirling flow discharged from the cyclonic oil separator between the cyclonic oil separator and the check valve.   2. The refrigeration cycle apparatus according to claim 1, wherein the check valve includes a valve body that moves up and down in a cylinder, a valve seat on which the valve body is seated, and a retaining ring that regulates a raised position of the valve body. A refrigeration cycle apparatus characterized by being a lift type check valve.   3. The refrigeration cycle apparatus according to claim 1, wherein the rectifying device includes a flow path and a rectifying member provided in the flow path for rectifying the swirling flow.   4. The refrigeration cycle apparatus according to claim 3, wherein the rectifying member is configured by a cross-shaped partition plate.   4. The refrigeration cycle apparatus according to claim 3, wherein the rectifying member is configured by a Y-shaped partition plate.   4. The refrigeration cycle apparatus according to claim 3, wherein the rectifying member is constituted by a single partition plate.   The refrigeration cycle apparatus according to claim 3, wherein the rectifying member is configured by a grid-like partition plate.   The refrigeration cycle apparatus according to claim 3, wherein the rectifying member is formed of a polygonal partition plate.   4. The refrigeration cycle apparatus according to claim 3, wherein the rectifying member is formed of a net.   4. The refrigeration cycle apparatus according to claim 3, wherein the rectifying member is configured by a plate having a plurality of round holes.

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