spiral compressor

Abstract

Spiral compressor with a stationary spiral (10) with an end plate (11) and a stationary spiral winding (12) extending from the end plate (11); a rotating spiral (20) with a rotating spiral winding (21), wherein the rotating spiral winding (21) engages with the stationary spiral winding (12) to form a plurality of compression chambers (3) for compressing a medium; a channel (6) formed in the end plate (11) of the stationary spiral (10), wherein the channel (6) leads to a compression chamber (3) of the plurality of compression chambers (3); and a valve (5) which is provided at the end plate (11) of the stationary spiral (10) and is designed to open when the pressure in one compression chamber (3) is higher than a predetermined pressure threshold, so that the medium in one compression chamber can flow out of one compression chamber through the channel (6), wherein the valve (5) has: a valve seat (51) which is provided on a side of the stationary spiral (10) facing away from the stationary spiral winding (12), wherein an opening of the channel (6) is formed in the valve seat (51); a valve element (52) designed to open and close the opening of the channel (6); and a spring (53) which is designed to exert a pressure force on the valve element (52) in the direction of the valve seat (53).

Description

[0001] A spiral compressor comprises a stationary spiral and a rotating spiral.

[0002] The stationary spiral has an end plate and a fixed spiral winding extending from the end plate. The rotating spiral has a circumferential spiral winding, and the circumferential spiral winding and the stationary spiral winding are connected to form a compression chamber for compressing a medium. When the compressor is operating, the refrigerant liquid or wet vapor is drawn into the compressor. Because the liquid is incompressible, the liquid drawn into the compressor will exert a significant shock force on the spiral windings. The spirals can break, which can damage the compressor and cause it to stop working.

[0003] Spiral compressors with valve arrangements are known, for example, from the documents US 2011 / 0 058 972 A1, JP 2017 - 053 302 A, CN 2 06 246 357 U, CN 1 09 162 919 A ​​and KR 10 2000 0 008 929 A.

[0004] CN 1 09 340 117 A also discloses a spiral compressor with a valve arrangement, wherein the valve arrangement connects a compression chamber with a back pressure chamber and a medium can flow from the compression chamber into the back pressure chamber when the pressure in the back pressure chamber is lower than in the compression chamber.

[0005] One objective of the embodiments of the present disclosure is to provide a spiral compressor, thereby improving, for example, the performance of the spiral compressor and, in particular, its resistance to liquid hammer.

[0006] The embodiment of the present disclosure provides a scroll compressor. The scroll compressor comprises: a stationary spiral with an end plate and a stationary spiral winding extending from the end plate; a rotating spiral with a rotating spiral winding, the rotating spiral winding engaging with the stationary spiral winding to form a plurality of compression chambers for compressing a medium; a channel formed in the end plate of the stationary spiral, the channel leading to one compression chamber of the plurality of compression chambers; and a valve provided at the end plate of the stationary spiral, configured to open when a pressure in one compression chamber exceeds a predetermined pressure threshold, allowing the medium in that one compression chamber to flow out of that one compression chamber through the channel.The valve further comprises: a valve seat provided on a side of the stationary spiral winding facing away from the stationary spiral winding, wherein an opening of the channel is formed in the valve seat; a valve element configured to open and close the opening of the channel; and a spring configured to exert a pressure force on the valve element in the direction of the valve seat.

[0007] According to embodiments of the present disclosure, the valve further comprises: a fastening element which is attached to a side of the stationary spiral winding facing away from the stationary spiral winding, wherein the fastening element has: a first side surface and a second side surface opposite each other, and a hole extending from the first side surface towards the second side surface to between the first side surface and the second side surface, wherein the valve element and the spring are provided in the hole of the fastening element.

[0008] According to embodiments of the present disclosure, the fastening element further comprises an opening extending from the first side surface in an axial direction of the hole to expose part of the hole, wherein the width of the opening is less than the diameter of the hole.

[0009] According to embodiments of the present disclosure, the fastening element has two of the aforementioned openings, and the two openings are opposite each other in a direction perpendicular to the axial direction of the hole.

[0010] According to embodiments of the present disclosure, the valve element has: a first side surface and a second side surface opposite each other, and a hole extending from the first side surface towards the second side surface to between the first side surface and the second side surface, wherein one end of the spring is inserted into the hole of the valve element.

[0011] According to embodiments of the present disclosure, the stationary spiral further comprises a projection extending from a side of the end plate facing away from the stationary spiral winding, and the valve seat is provided in a side surface of the projection.

[0012] According to embodiments of the present disclosure, the stationary spiral further comprises a projection extending from a side of the end plate facing away from the stationary spiral winding, wherein the valve seat is provided in a side surface of the projection, and the stationary spiral further comprises a recess on the side of the end plate facing away from the stationary spiral winding, and the fastening element is provided in the recess.

[0013] According to embodiments of the present disclosure, the stationary spiral further comprises a projection extending from a side of the end plate facing away from the stationary spiral winding, wherein the valve seat is provided in a side surface of the projection, and the first side surface of the fastening element and the side surface of the projection abut each other.

[0014] According to embodiments of the present disclosure, the side surface of the projection extends along an axial direction of the stationary spiral, and the fastening element is spaced apart from a bottom surface of the recess.

[0015] According to exemplary embodiments of the present disclosure, one compression chamber of the several compression chambers is a radially outermost compression chamber of the several compression chambers.

[0016] The spiral compressor according to the embodiments of the present disclosure can, for example, improve the performance of the spiral compressor. BRIEF DESCRIPTION OF THE DRAWINGS Fig. Figure 1 is a schematic partial cross-sectional view of a spiral compressor according to an embodiment of the present disclosure; Fig. Figure 2 is an enlarged partial cross-sectional view of a valve and associated parts, shown in Fig. 1 are shown; Fig. Figure 3 is a schematic perspective view of a part of the in Fig. 1 spiral compressor shown; Fig. 4 is a partially enlarged perspective view of the in Fig. 3 valve and associated parts shown; Fig. 5 is a cross-sectional view of the in Fig. 1 spiral compressor shown; and Fig. Figure 6 is a partially enlarged cross-sectional view of the [structure]. Fig. Part A (the valve and associated parts) is shown in section 5.

[0017] The embodiments of the present disclosure are described below in conjunction with the drawings.

[0018] Referring to the Fig. According to the embodiments described in this disclosure, the spiral compressor comprises, as described in Figures 1 to 6: a stationary spiral 10, a rotating spiral 20, a channel 6, and a valve 5. The stationary spiral 10 has an end plate 11 and a stationary spiral winding 12 extending from the end plate 11. The rotating spiral 20 has a rotating spiral winding 21. The rotating spiral winding 21 and the stationary spiral winding 12 are connected to each other to form a plurality of compression chambers 3 for compressing a medium. The channel 6 is formed in the end plate 11 of the stationary spiral 10, and the channel 6 leads to one of the plurality of compression chambers 3.The valve 5 is provided at the end plate 11 of the stationary spiral 10 and is designed to open when the pressure in the compression chamber 3 exceeds the predetermined pressure threshold, allowing the medium in the compression chamber 3 to flow out of the compression chamber 3 through the channel 6. The compression chamber 3 can be the radially outermost compression chamber 3 of a plurality of compression chambers 3. The predetermined pressure threshold can be set according to the difference between the pressure in the compression chamber 3 corresponding to the valve 5 and the pressure at the inlet of the spiral compressor.

[0019] According to the Fig. In the embodiments described in this disclosure, the valve 5 comprises, as described in Figures 2 to 4, a valve seat 51, a valve element 52, and a spring 53. The valve seat 51 is arranged on the side of the stationary spiral 10 facing away from the stationary spiral winding 12, and an opening of the channel 6 is formed in the valve seat 51. The valve element 52 is configured to open and close the opening of the channel 6. The spring 53 is configured to exert a compressive force on the valve element 52 in the direction of the valve seat 51. The elastic force of the spring 53 is selected according to the predetermined pressure threshold value mentioned above, such that when the pressure in the compression chamber 3, which corresponds to the valve 5, is higher than the elastic force of the spring 53, the spring 53 is pushed away by the flow of the medium in the channel 6, thus opening the valve 5.This causes the medium in compression chamber 3 to flow out of compression chamber 3 through channel 6. The medium is, for example, refrigerant liquid or refrigerant vapor.

[0020] According to the Fig. In embodiments 2 to 4 of the present disclosure, the valve 5 further comprises a fastening element 54, which is attached to the side of the stationary spiral winding 10 facing away from the stationary spiral winding 12. The fastening element 54 has a first side surface 541 and a second side surface 542, which are opposite each other, and a hole 540, which extends from the first side surface 541 towards the second side surface 542 to between the first side surface 541 and the second side surface 542. The valve element 52 and the spring 53 are movably provided in the hole 540 of the fastening element 54. According to an example of the present disclosure, the fastening element 54 further has an opening 548, which extends from the first side surface 541 in the axial direction of the hole 540 to expose a portion of the hole 540. The width of the opening 548 is smaller than the diameter of the hole 540.The fastening element 54 can have two openings 548, the two openings 548 being opposite each other in a direction perpendicular to the axial direction of the hole. For example, the two openings 548 are located on the top and bottom of the fastening element 54, respectively.

[0021] According to the Fig. In the embodiments described in the present disclosure, the valve element 52 has, as described in Figures 2 to 4, a first side surface 521 and a second side surface 522, which are opposite each other, and a hole 520, which extends from the first side surface 521 towards the second side surface 522 to between the first side surface 521 and the second side surface 522. One end of the spring 53 is inserted into the hole 520 of the valve element 52.

[0022] According to the Fig. In the embodiments described in the present disclosure, the stationary spiral 10 further comprises a projection 7, which projects from the side of the end plate 11 facing away from the stationary spiral winding 12, with the valve seat 51 being provided in the side surface 71 of the projection 7. The first side surface 541 of the fastening element 54 and the side surface 71 of the projection 7 can abut each other. The fastening element 54 can be fastened to the side surface 71 of the projection 7 of the stationary spiral 10 by means of screws 9 (see Fig. 4) The fastening element 54 can also be attached to the side surface 71 of the projection 7 of the fixed spiral 10 by other means.

[0023] According to the Fig. In the embodiments described in this disclosure, the stationary spiral 10 further comprises a recess 8 on the side of the end plate 11 facing away from the stationary spiral winding 12, with the fastening element 54 being provided in the recess 8. The side surface 71 of the projection 7 extends along the axial direction of the stationary spiral 10, with the fastening element 54 being spaced apart from the bottom surface 81 of the recess 8. The bottom surface 81 of the recess 8 can extend perpendicular to the axial direction of the stationary spiral 10. For example, in use, the side surface 71 of the projection 7 can extend vertically, and the bottom surface 81 of the recess 8 can extend horizontally.

[0024] According to the Fig.In embodiments 2 to 5 of the present disclosure, the channel 6 comprises a first hole 61 extending into the projection 7 and a second hole 62 extending from the projection 7 towards the side of the end plate 11 facing away from the projection 7 and passing through the end plate 11. The first hole 61 is connected to the second hole 62. For example, the first hole 61 extends into the projection 7 in a direction perpendicular to the axial direction of the stationary spiral 10, and the second hole 62 extends from the projection 7 in the axial direction of the stationary spiral 10 towards the side of the end plate 11 facing away from the projection 7 and passes through the end plate 11. The second hole 62 leads into the compression chamber 3.The position of the second hole 62 is located at a predetermined angle from the position where the circumferential spiral winding 21 and the fixed spiral winding 12 begin to compress, e.g., from 281 degrees to 301 degrees, e.g., approximately 291 degrees. The second hole 62 can comprise two holes 62.

[0025] The spiral compressor according to the embodiments of the present disclosure can, for example, improve the resistance of the spiral compressor to liquid hammer.

[0026] Furthermore, the valve 5 is used in the spiral compressor according to the embodiments of the present disclosure. Thus, when the liquid medium is drawn into the spiral compressor, since the pressure in the compression chamber 3 will be higher than the predetermined pressure threshold, the valve 5 is opened so that the medium in the compression chamber 3 can flow out of the compression chamber 3 through the channel 6.

[0027] Since channel 6 leads to the radially outermost compression chamber 3, i.e., to the compression chamber 3 in the area of ​​the medium intake opening, the liquid medium, when it is drawn into the spiral compressor, can be discharged in time to prevent damage to the compressor.

[0028] Although the above embodiments are described, some features in the above embodiments can be combined to form new embodiments.

Claims

[1] Scroll compressor with a fixed scroll (10) having an end plate (11) and a fixed spiral winding (12) extending from the end plate (11); an orbiting scroll (20) having an orbiting spiral winding (21), the orbiting spiral winding (21) engaging with the fixed spiral winding (12) to form a plurality of compression chambers (3) for compressing a medium; a channel (6) formed in the end plate (11) of the fixed scroll (10), the channel (6) leading to one of the plurality of compression chambers (3); and a valve (5) provided on the end plate (11) of the fixed scroll (10) and configured to open when a pressure in said one compression chamber (3) is higher than a predetermined pressure threshold, so that the medium in said one compression chamber can flow out of said one compression chamber through said channel (6), wherein the valve (5) comprises: a valve seat (51) provided on a side of the fixed scroll (10) facing away from the fixed scroll winding (12), an opening of the channel (6) being formed in the valve seat (51); a valve element (52) designed to open and close the opening of the channel (6); and a spring (53) which is designed such that it exerts a compressive force on the valve element (52) in the direction of the valve seat (53). [2] Scroll compressor according to claim 1, wherein the valve (5) further comprises: a fastening element (54) fastened to a side of the fixed scroll (10) facing away from the fixed spiral winding (12), the fastening element (54) comprising: a first side surface (541) and a second side surface (542) which are opposite to each other; and a hole (540) extending from the first side surface (541) toward the second side surface (542) to between the first side surface (541) and the second side surface (542), the valve element (52) and the spring (53) being provided in the hole (540) of the fastening element (54). [3] A scroll compressor according to claim 2, wherein: the fastening element (54) further comprises an opening (548) extending from the first side surface (541) in an axial direction of the hole (540) to expose a part of the hole (540), and wherein a width of the opening (548) is smaller than a diameter of the hole (540). [4] A scroll compressor according to claim 3, wherein: the fastening element (54) has two of said openings (548), and the two openings (548) are opposite each other in a direction perpendicular to the axial direction of the hole (540). [5] A scroll compressor according to claim 1, wherein the valve element (52) comprises: a first side surface (521) and a second side surface (522) which are opposite to each other, and a hole (520) extending from the first side surface (521) toward the second side surface (522) to between the first side surface (521) and the second side surface (522), one end of the spring (53) being inserted into the hole (520) of the valve element (52). [6] Scroll compressor according to one of claims 1 to 5, wherein: the fixed scroll (10) further comprises a projection (7) projecting from a side of the end plate (11) facing away from the fixed spiral winding (12), and the valve seat (51) is provided in a side surface (71) of the projection (7). [7] A scroll compressor according to claim 2, wherein: the fixed spiral (10) further comprises a projection (7) projecting from a side of the end plate (11) facing away from the fixed spiral winding (12), and the valve seat (51) is provided in a side surface (71) of the projection (7), and the fixed spiral (10) further comprises a recess (8) on the side of the end plate (11) facing away from the fixed spiral winding (12), and the fastening element (54) is provided in the recess (8). [8] Scroll compressor according to claim 2, wherein: the fixed spiral (10) further comprises a projection (8) projecting from a side of the end plate (11) facing away from the fixed spiral winding (12), and the valve seat (51) is provided in a side surface (71) of the projection, and the first side surface (541) of the fastening element (54) and the side surface (71) of the projection (7) abut each other. [9] A scroll compressor according to claim 7 or 8, wherein: the side surface (71) of the projection (7) extends along an axial direction of the fixed spiral (10), and the fastening element (54) is spaced from a bottom surface (81) of the recess (8). [10] A scroll compressor according to claim 1, wherein: the one compression chamber (3) of the plurality of compression chambers (3) is a radially outermost compression chamber (3) of the plurality of compression chambers (3)

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