JP-2026074468-A - Scroll compressor

Abstract

[Problem] To provide a scroll compressor that can ensure lubrication to the Oldham ring and suppress the decrease in compression efficiency under low pressure ratio conditions. [Solution] The scroll compressor 100 comprises a spiral scroll 1 having a spiral spiral wrap 1a, a fixed scroll 2 having a spiral fixed wrap 2a, a frame 5 supporting the fixed scroll 2, an intake chamber 12 for drawing in refrigerant, a compression chamber 3 formed between the spiral wrap 1a and the fixed wrap 2a for compressing the refrigerant, a back pressure chamber 6 formed between the spiral scroll 1 and the frame 5, compression-side communication passages 8a and 8b that intermittently connect the compression chamber 3 and the back pressure chamber 6, and an intake-side communication passage 13 for intermittently connecting the intake chamber 12 and the back pressure chamber 6, wherein the timing of the suction-side communication passage 13 is different from the timing of the compression-side communication passage. [Selection Diagram] Figure 1

Inventors

• 熊倉 英之
• 幸野 雄

Assignees

• ボッシュホームコンフォートジャパン株式会社

Dates

Publication Date

20260507

Application Date

20241021

Claims (4)

1. A spiral scroll having a spiral-shaped rotating wrap and a fixed scroll having a spiral-shaped fixed wrap, A frame supporting the aforementioned fixed scroll, An intake chamber for drawing in refrigerant, A compression chamber formed between the swirling wrap and the fixed wrap, for compressing the refrigerant, A back pressure chamber formed between the orbiting scroll and the frame, A compression-side communication passage intermittently connects the compression chamber and the back pressure chamber, It comprises an intake-side communication passage for intermittently connecting the intake chamber and the back pressure chamber, A scroll compressor in which the timing of the suction-side communication passage is different from the timing of the compression-side communication passage.
2. The system comprises a valve body that opens and closes the intake side communication passage, and a spring that biases the valve body in the direction of opening. The scroll compressor according to claim 1, wherein the valve body is positioned such that the pressure of the back pressure chamber acts on one end and the discharge pressure acts on the other end.
3. The scroll compressor according to claim 2, wherein the valve body is provided with a sealing member that separates the space on which the pressure of the back pressure chamber acts from the space on which the discharge pressure acts.
4. The fixed scroll comprises a valve chamber in which the valve body is provided, a communication passage connecting the valve chamber and the intake chamber, and a stepped portion provided at the end of the side wall on the outer periphery side of the intake chamber. The scroll compressor according to claim 2 or 3, wherein the communication passage is in communication with the stepped portion.

Description

This disclosure relates to a scroll compressor. In computer-based air conditioning compressors and VRF compressors, operation under low pressure ratio conditions is required. Under low pressure ratio conditions, the pressure difference between the back pressure chamber and the discharge pressure tends to be small. This small pressure difference makes lubrication of the Oldham ring difficult. Patent Document 1 discloses a scroll compressor equipped with a means for opening and closing a passage that connects the back pressure chamber and the suction chamber when the pressure difference between the back pressure chamber and the discharge pressure falls below the pressure difference (oil supply differential pressure) required to supply oil to the Oldham ring. When the oil supply differential pressure decreases, the opening and closing means opens, releasing the pressure from the back pressure chamber into the suction chamber, thereby ensuring the oil supply differential pressure to the Oldham ring. The scroll compressor described above features a pore in the end plate of the orbiting scroll, which communicates with a back pressure chamber formed by the orbiting scroll and the frame. This guides the gaseous refrigerant inside the scroll into the back pressure chamber, applying an upward force to the back of the orbiting scroll with the gaseous refrigerant at an intermediate pressure (the pressure between the suction pressure (low-pressure side pressure) and the discharge pressure). This counteracts the thrust force (a detachment force attempting to push the orbiting scroll downward) caused by the compression pressure in the multiple compression chambers formed by the orbiting scroll and the stationary scroll. Special Publication No. 6-1073 Figure 1 shows a portion of the longitudinal cross-section of a scroll compressor according to one embodiment.Figure 2 is a bottom view showing the fixed scroll of the scroll compressor according to the same embodiment.Figure 3 shows a portion of the vertical cross-section of a scroll compressor according to the same embodiment.Figure 4 shows a portion of the vertical cross-section of a scroll compressor according to the same embodiment.Figure 5 is an enlarged view of the valve body portion shown in Figure 1.Figure 6 shows a portion of the longitudinal cross-section of a scroll compressor according to another embodiment. A scroll compressor 100 according to one embodiment will be described with reference to Figures 1 to 5. Note that the dimensional ratios in the drawings do not necessarily match the actual dimensional ratios, nor do the dimensional ratios between the drawings necessarily match. Figures 1, 3, and 4 show a portion of the vertical cross-section of the scroll compressor 100, Figure 2 is a bottom view showing the fixed scroll 2 of the scroll compressor 100, and Figure 5 is an enlarged view of the valve body 16 portion of Figure 1. As shown in Figure 1, the scroll compressor 100 (hereinafter also simply referred to as "compressor 100") is configured to compress the refrigerant. The compressor 100 is used, for example, in large commercial air conditioners such as VRFs and computer air conditioners. The compressor 100 comprises a sealed container (not shown), a rotating scroll 1, a fixed scroll 2, a frame 5, an Oldham ring 11, a crankshaft (not shown), and an electric motor (not shown). The sealed container is a cylindrical container that houses the orbiting scroll 1, the stationary scroll 2, the frame 5, the Oldham ring 11, the crankshaft, and the electric motor, and is substantially sealed. Lubricating oil to enhance the lubrication of the compressor 100 is sealed inside the sealed container and is stored in an oil reservoir at the bottom of the container. The sealed container comprises a cylindrical chamber, a lid chamber fixed to the upper part of the cylindrical chamber, and a bottom chamber fixed to the lower part of the cylindrical chamber. An intake pipe (not shown) is inserted into and fixed to the lid chamber of the sealed container. The intake pipe is a tube that guides the refrigerant to the intake chamber 12, which will be described later. A discharge pipe (not shown) is inserted into and fixed to the cylindrical chamber of the sealed container. The discharge pipe is a tube that guides the gaseous refrigerant (also called gaseous refrigerant) compressed in the compression chamber 3, which will be described later, to the outside of the compressor 100. The crankshaft is a shaft that rotates integrally with the rotor of the electric motor and extends vertically. The crankshaft is coaxially fixed to the rotor of the electric motor. Inside the crankshaft, there is a lubrication passage through which lubricating oil flows, and this passage also extends vertically. The lubrication passage is immersed in lubricating oil accumulated in an oil reservoir, and the lubricating oil flows through the passage (is drawn up) due to the pressure difference (lubrication dif