A compressor with a pressure differential unloading valve

Abstract

The present invention discloses a compressor with a pressure differential unloading valve, comprising: a shell, a housing space is formed in the shell; a static scroll, a high-pressure chamber is formed between the upper end of the static scroll and the shell, an exhaust passage is also provided on the static scroll, and the upper end of the exhaust passage is connected to the high-pressure chamber; a movable scroll, the movable scroll is meshed with the static scroll, a compression chamber is formed between the static scroll and the movable scroll, and the compression chamber is connected to the lower end of the exhaust passage; a stop valve assembly, the stop valve assembly is installed at the upper end of the exhaust passage; a pressure differential unloading valve, the pressure differential unloading valve is installed on the static scroll. Through the application of the present invention, the pressure differential characteristics of the compressor itself are utilized and supplemented by spring force, so that the high and low pressures can be quickly balanced when the compressor is shut down safely and reliably, thereby ensuring that the compressor can be started at any time under low load or no load conditions; and the compressor is relatively simple to manufacture and install, and is easy to produce and disassemble.

Description

Technical Field

[0001] The invention relates to the technical field of compressors, and in particular to a compressor with a pressure difference unloading valve. Background Art

[0002] Scroll compressors, especially variable frequency scroll compressors, may shut down due to refrigeration and air conditioning conditions reaching set requirements, or shut down due to abnormal power supply. After the compressor shuts down, the pressure inside the compressor is difficult to balance in a short time due to the presence of the compressor exhaust shut-off valve. When it needs to be restarted or the abnormal situation is resolved, the compressor is often difficult to start or cannot be started due to the large pressure difference. This situation will have a serious impact on the comfort of end customers. Summary of the invention

[0003] In view of this, in order to solve the above problems, the object of the present invention is to provide a compressor with a pressure differential unloading valve, comprising:

[0004] A shell, wherein the shell is a hollow structure and an accommodating space is formed inside the shell;

[0005] A fixed scroll disk, the fixed scroll disk is installed in the accommodating space, a high-pressure chamber is formed between the upper end of the fixed scroll disk and the shell, and an exhaust passage is also provided on the fixed scroll disk, and the upper end of the exhaust passage is connected to the high-pressure chamber;

[0006] A movable scroll, the movable scroll is installed in the accommodating space, the movable scroll is installed at the lower end of the fixed scroll, the movable scroll is meshed with the fixed scroll, a compression chamber is formed between the fixed scroll and the movable scroll, and the compression chamber is communicated with the lower end of the exhaust passage;

[0007] A stop valve assembly, the stop valve assembly being mounted at an upper end of the exhaust passage;

[0008] A pressure differential unloading valve, wherein the pressure differential unloading valve is installed on the fixed scroll plate;

[0009] Wherein, the pressure differential unloading valve comprises:

[0010] An unloading channel, wherein the unloading channel is arranged on an upper portion of the fixed scroll;

[0011] a first gas channel, the first gas channel being communicated with one end of the unloading channel, and the first gas channel being connected with the exhaust channel;

[0012] a second gas channel, one end of the second gas channel being in communication with the high pressure chamber, and the other end of the second gas channel being in communication with the middle portion of the unloading channel;

[0013] a third gas passage, one end of which is in communication with the other end of the unloading passage, and the other end of which is in communication with the outer edge of the compression chamber away from the axis of the fixed scroll;

[0014] A spring, one end of which is fixed to the other end of the unloading channel;

[0015] A double-headed piston valve assembly, wherein the double-headed piston valve assembly can be slidably installed in the unloading channel, one end of the double-headed piston valve assembly is fixedly connected to the other end of the spring, and the other end of the double-headed piston valve assembly can be operably pressed against the connection between the first gas channel and the unloading channel.

[0016] In another preferred embodiment, a channel hole is provided on the upper portion of the static scroll disk, the channel hole is provided along the radial direction of the static scroll disk, one end of the channel hole is connected to the exhaust channel, the axial cross-section of the channel hole is stepped, the end of the channel hole close to the exhaust channel is radially contracted to form the first gas channel, the end of the channel hole away from the exhaust channel forms the unloading channel, the inner diameter of the unloading channel is larger than the inner diameter of the first gas channel, the radial cross-section of the unloading channel is circular, the double-headed piston valve assembly matches the unloading channel, a first through hole is provided on the upper portion of the static scroll disk along the axial direction, the lower end of the first through hole is connected to the middle part of the unloading channel, the second gas channel is formed in the first through hole, a second through hole is provided in the unloading channel near the outer edge of the compression chamber in the vertical direction, the lower end of the second through hole is connected to the compression chamber, and the third gas channel is formed in the second through hole.

[0017] In another preferred embodiment, it also includes: a blocking piece, which blocks the other end of the channel hole, and the end of the blocking piece close to the channel hole is fixedly connected to one end of the spring, and a circle of sealing strip is fixedly provided on the outer edge of the blocking piece, and the sealing strip is tightly attached to the outer edge of the other end of the channel hole.

[0018] In another preferred embodiment, the axial length of the double-headed piston valve assembly along the unloading passage is smaller than the length from one end of the unloading passage to the axis of the second gas passage.

[0019] In another preferred embodiment, the double-headed piston valve assembly includes a first piston head, a connecting rod and a second piston head connected in sequence, the first piston head is operably sealed at the connection between the first gas channel and the unloading channel, and the second piston head is connected to the other end of the spring.

[0020] In another preferred embodiment, the area of ​​the radial cross section of the first piston head, the area of ​​the radial cross section of the second piston head, and the area of ​​the radial cross section of the connecting rod are all equal.

[0021] In another preferred embodiment, the first piston head and the second piston head are both cylindrical, and the central axis of the first piston head, the central axis of the connecting rod, the central axis of the second piston head and the central axis of the unloading channel are all coaxially arranged.

[0022] In another preferred embodiment, the first piston head and the second piston head are each provided with an annular groove along the annular direction, and an O-ring or a piston ring with a notch is installed in the annular groove.

[0023] Due to the adoption of the above technical solution, the present invention has the following positive effects compared with the prior art: by applying the present invention, utilizing the pressure difference characteristics of the compressor itself and assisted by spring force, it is possible to safely and reliably achieve rapid balance of high and low pressures when the compressor is shut down, thereby ensuring that the compressor can be started at any time under low load or no load conditions; and the compressor is relatively simple to manufacture and install, and is easy to produce and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A cross-sectional view of a compressor with a pressure differential unloading valve according to the present invention;

[0025] Figure 2 It is a schematic diagram of a shutdown state of a compressor with a pressure differential unloading valve according to the present invention;

[0026] Figure 3 It is a schematic diagram of the operating state of a compressor with a pressure differential unloading valve according to the present invention;

[0027] Figure 4 A schematic diagram of a double-headed piston valve assembly of a compressor with a pressure differential unloading valve according to the present invention Figure 1 ;

[0028] Figure 5 A schematic diagram of a double-headed piston valve assembly of a compressor with a pressure differential unloading valve according to the present invention Figure 2 ;

[0029] Figure 6 It is a schematic diagram of an O-ring seal of a compressor with a pressure differential unloading valve according to the present invention;

[0030] Figure 7 The figure is a schematic diagram of a piston ring of a compressor with a pressure differential unloading valve according to the present invention.

[0031] In the attached figure:

[0032] 1. Shell; 2. Stationary scroll; 21. High-pressure chamber; 22. Exhaust passage; 23. Exhaust chamber; 3. Orbital scroll; 31. Compression chamber; 4. Stop valve assembly; 5. Differential pressure unloading valve; 51. Unloading passage; 52. First gas passage; 53. Second gas passage; 54. Third gas passage; 55. Spring; 56. Double-headed piston valve assembly; 57. Sealing piece; 58. Sealing strip; 561. First piston head; 562. Connecting rod; 563. Second piston head; 564. O-ring; 565. Piston ring. DETAILED DESCRIPTION

[0033] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0034] like Figures 1 to 3As shown in the figure, a compressor with a pressure differential unloading valve 5 in a preferred embodiment is shown, comprising: a shell 1, the shell 1 is a hollow structure, and a housing space is formed in the shell 1; a fixed scroll plate 2, the fixed scroll plate 2 is installed in the housing space, a high-pressure chamber 21 is formed between the upper end of the fixed scroll plate 2 and the shell 1, and an exhaust channel 22 is also provided on the fixed scroll plate 2, and the upper end of the exhaust channel 22 is connected to the high-pressure chamber 21; a movable scroll plate 3, the movable scroll plate 3 is installed in the housing space, and a high-pressure chamber 21 is formed between the upper end of the fixed scroll plate 2 and the shell 1. In the space, the movable scroll 3 is installed at the lower end of the fixed scroll 2, the movable scroll 3 is meshed with the fixed scroll 2, a compression chamber 31 is formed between the fixed scroll 2 and the movable scroll 3, and the compression chamber 31 is communicated with the lower end of the exhaust passage 22; the stop valve assembly 4, the stop valve assembly 4 is installed at the upper end of the exhaust passage 22; the pressure differential unloading valve 5, the pressure differential unloading valve 5 is installed on the fixed scroll 2; wherein the pressure differential unloading valve 5 includes: an unloading passage 51, the unloading passage 51 is arranged at The upper part of the static scroll plate 2; a first gas channel 52, the first gas channel 52 is connected to one end of the unloading channel 51, and the first gas channel 52 is connected to the exhaust channel 22; a second gas channel 53, one end of the second gas channel 53 is connected to the high-pressure chamber 21, and the other end of the second gas channel 53 is connected to the middle of the unloading channel 51; a third gas channel 54, one end of the third gas channel 54 is connected to the other end of the unloading channel 51, and the other end of the third gas channel 54 is connected to the outer edge of the compression chamber 31 away from the axis of the static scroll plate 2; a spring 55, one end of the spring 55 is fixed to the other end of the unloading channel 51; a double-headed piston valve assembly 56, the double-headed piston valve assembly 56 can be slidably installed in the unloading channel 51, one end of the double-headed piston valve assembly 56 is fixedly connected to the other end of the spring 55, and the other end of the double-headed piston valve assembly 56 can be operably pressed against the connection between the first gas channel 52 and the unloading channel 51.Furthermore, the above-mentioned compressor should also include a crankshaft connected to the movable scroll 3 and a motor for driving the crankshaft to move during actual use; by matching the stationary scroll and the inner wall of the shell 1, a high-pressure chamber 21 is formed between the upper end of the stationary scroll and the upper wall of the first accommodating space, and the pressure in the high-pressure chamber 21 is Pd; the movable scroll 3 and the stationary scroll 2 jointly form a compression chamber 31 for compression. When the above-mentioned compressor is powered on, the movable scroll 3 is driven by the crankshaft to mesh and rotate with the stationary scroll 2, and a suction chamber is formed at the edge of the movable scroll 3, which is a suction chamber with a pressure of Ps The low-pressure gas is continuously compressed by the suction chamber and transported to the center of the compression chamber 31. As the movable scroll 3 continues to move, the low-pressure gas continues to move in the compression chamber 31, and forms a low-pressure chamber with a gas pressure slightly greater than Ps at one end close to the suction chamber. The low-pressure chamber is located at the outer edge of the compression chamber 31 and is connected to the lower end of the third gas channel 54. Then, a high-pressure gas with a pressure of P is generated in the exhaust chamber 23, that is, the center of the compression chamber. The upper end of the exhaust chamber 23 is connected to the lower end of the exhaust channel 22, and the values ​​of Pd, Ps and P mentioned above change periodically with the translation of the movable scroll. The stop valve assembly 4 is an exhaust stop valve, preferably, a reed valve can be used, the above-mentioned reed valve includes a limit baffle arranged at the top and a flexible reed arranged at the bottom, and the above-mentioned flexible reed performs corresponding opening and closing operations under the pressure changes of the high-pressure chamber 21 and the exhaust channel 22; the stop valve assembly 4 divides the exhaust chamber 23 from the high-pressure chamber 21, and when P is greater than Pd, the stop valve assembly 4 is opened, the exhaust chamber 23 is connected with the high-pressure chamber 21 and P is equal to Pd; when P is less than Pd, the stop valve assembly 4 is closed, the exhaust chamber 23 is disconnected from the high-pressure chamber 21, and at this time P is less than Pd; and the suction chamber pressure is Ps, which is generally less than or equal to the exhaust chamber pressure P.

[0035] like Figure 2 As shown, the state of the differential pressure unloading valve 5 of the above-mentioned compressor in the shutdown state is shown. At this time, the pressures in the high-pressure chamber 21, the exhaust chamber 23 and the suction chamber are the same, the stop valve assembly 4 is in an open state, and the double-headed piston valve assembly 56 moves along the unloading channel 51 toward the first gas channel 52, so that the second gas channel 53 is connected with the third gas channel 54 through the unloading channel 51, and the first gas channel 52 is blocked by one end of the double-headed piston valve assembly 56, and the high-pressure chamber 21 is connected with the low-pressure chamber, and the suction chamber contains low-pressure gas with a pressure of Ps, thereby ensuring that the compressor is unloaded.

[0036] like Figure 3As shown, the state of the differential pressure unloading valve 5 of the above-mentioned compressor when it is powered on and running is shown. The pressure in the suction chamber decreases rapidly, while the pressure in the exhaust chamber 23 increases rapidly, and its increasing speed is faster than the increasing speed of the pressure in the high-pressure chamber 21. At this time, a differential pressure force is generated at both ends of the double-headed piston valve assembly 56, and the double-headed piston valve assembly 56 overcomes the force of the spring 55 and moves in a direction away from the first gas channel 52, thereby cutting off the connection between the second gas channel 53 and the third gas channel 54, and the connection between the high-pressure chamber 21 and the low-pressure chamber is interrupted, so that the compressor quickly enters a normal working state; and during the operation of the entire compressor, the shut-off valve assembly 4 performs periodic and repeated opening and closing movements.

[0037] Furthermore, when the compressor needs to be shut down due to power supply abnormality protection or cooling / heating reaching the set value, the power from the motor disappears, the movable scroll 3 is disengaged from the fixed scroll 2, and the pressure in the compression chamber 31 is quickly released and reaches the pressure of the low-pressure chamber. At the same time, the stop valve assembly 4 is closed under the action of the pressure difference, thereby forming a large pressure difference between the high-pressure chamber 21 and the low-pressure chamber. At this time, the double-headed piston valve assembly 56 receives the spring force, which acts on the low pressure at both ends of the double-headed piston valve assembly 56, as well as the internal pressure from the high-pressure chamber 21. Since the contact surface areas at both ends of the double-headed piston valve assembly 56 are equal, the double-headed piston valve assembly 56 is only acted upon by the force of the spring 55. After the external force is suddenly removed, the double-headed piston valve assembly 56 quickly moves to the first gas channel 52, thereby connecting the second gas channel 53 with the third gas channel 54, achieving the gas pressure balance in the high-pressure chamber 21 and the low-pressure chamber, and realizing the pressure difference unloading function.

[0038] Further, as a preferred embodiment, a channel hole is provided on the upper part of the static scroll disk 2, and the channel hole is provided along the radial direction of the static scroll disk 2, one end of the channel hole is connected with the exhaust channel 22, the axial cross-section of the channel hole is stepped, the end of the channel hole close to the exhaust channel 22 is radially contracted to form a first gas channel 52, and the end of the channel hole away from the exhaust channel 22 forms an unloading channel 51, the inner diameter of the unloading channel 51 is larger than the inner diameter of the first gas channel 52, the radial cross-section of the unloading channel 51 is circular, the double-headed piston valve assembly 56 matches the unloading channel 51, a first through hole is provided on the upper part of the static scroll disk 2 along the axial direction, the lower end of the first through hole is connected with the middle part of the unloading channel 51, a second gas channel 53 is formed in the first through hole, a second through hole is provided in the vertical direction at the outer edge of the unloading channel 51 close to the compression chamber 31, the lower end of the second through hole is connected with the compression chamber 31, and a third gas channel 54 is formed in the second through hole. Furthermore, the stationary scroll 2 includes a back plate arranged at both ends and a vortex tooth arranged at the lower end of the back plate and matching with the movable scroll 3. A channel hole is opened on the back plate of the stationary scroll 2, and an unloading channel 51 and a first gas channel 52 are formed in sequence from the outside to the inside. A step surface is formed at the connection between the first gas channel 52 and the unloading channel 51. The above-mentioned step surface serves as a stop surface of the double-headed piston valve assembly 56, thereby limiting the axial movement of the double-headed piston valve assembly 56 in the unloading channel 51.

[0039] Furthermore, as a preferred embodiment, it also includes: a blocking member 57, which blocks the other end of the channel hole, and the end of the blocking member 57 close to the channel hole is fixedly connected to one end of the spring 55, and a circle of sealing strip 58 is fixedly provided on the outer edge of the blocking member 57, and the sealing strip 58 is closely attached to the outer edge of the other end of the channel hole. Furthermore, the unloading channel 51 is sealed by the blocking member 57, and a fixed end is provided for the installation of the spring 55.

[0040] Further, as a preferred embodiment, the length of the double-headed piston valve assembly 56 along the axial direction of the unloading channel 51 is less than the length from one end of the unloading channel 51 to the axis of the second gas channel 53. Further, the second gas channel 53 and the third gas channel 54 are both arranged in the vertical direction and communicated with the unloading channel 51, and the second gas channel 53 and the third gas channel 54 are both arranged at one end of the unloading channel 51 away from the first gas channel 42, and preferably, the second gas channel 53 is arranged close to the first gas channel 52 relative to the third gas channel 54, and the length from one end of the unloading channel 51 to the axis of the second gas channel 53, that is, the distance from the connection position of the unloading channel 51 and the first gas channel 52 to the setting position of the second gas channel 53 along the axial direction of the unloading channel 51, should be less than the length of the double-headed piston valve assembly 56, so that when the double-headed piston valve assembly 56 is in the process of movement, when the double-headed piston valve assembly 56 is against the first gas channel 52, the second gas channel 53 and the third gas channel 54 are both in an open state.

[0041] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention.

[0042] The present invention also has the following implementation modes based on the above:

[0043] Depend on Figure 4 As shown, in a further embodiment of the present invention, the double-headed piston valve assembly 56 includes a first piston head 561, a connecting rod 562 and a second piston head 563 connected in sequence, the first piston head 561 is operably blocked at the connection between the first gas channel 52 and the unloading channel 51, and the second piston head 563 is connected to the other end of the spring 55.

[0044] In a further embodiment of the present invention, the radial cross-sectional area of ​​the first piston head 561, the radial cross-sectional area of ​​the second piston head 563 and the radial cross-sectional area of ​​the connecting rod 562 are all equal. Further, the connection between the first piston head 561 and the second piston head 563 is enhanced, and the strength of the connecting rod 562 is enhanced; and in another preferred embodiment, as Figure 5 A double-headed piston valve assembly 56 is shown, in which the radial cross-sectional areas at both ends of the connecting rod 562 are equal to the radial cross-sectional areas of the first piston head and the second piston head, and the middle portion of the connecting rod 562 is slightly recessed, thereby not increasing the friction between the connecting rod 562 and the unloading channel 51, and enhancing the connection strength between the first piston head 561 and the second piston head 562.

[0045] In a further embodiment of the present invention, the first piston head 561 and the second piston head 563 are both cylindrically arranged, and the central axis of the first piston head 561, the central axis of the connecting rod 562, the central axis of the second piston head 563 and the central axis of the unloading channel 51 are all coaxially arranged.

[0046] Depend on Figure 6 to Figure 7 As shown, in a further embodiment of the present invention, the first piston head 561 and the second piston head 563 are both provided with an annular groove along the annular direction, and an O-ring 564 or a piston ring 565 with a notch is installed in the annular groove. Further, the sealing performance can be improved by the O-ring 564, and the adaptability of the piston ring 565 to high temperature expansion can also be improved.

[0047] The above description is only a preferred embodiment of the present invention, and does not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A compressor with a pressure differential unloading valve, It is characterized in that include: A shell, wherein the shell is a hollow structure and an accommodating space is formed inside the shell; A fixed scroll disk, the fixed scroll disk is installed in the accommodating space, a high-pressure chamber is formed between the upper end of the fixed scroll disk and the shell, and an exhaust passage is also provided on the fixed scroll disk, and the upper end of the exhaust passage is connected to the high-pressure chamber; A movable scroll, the movable scroll is installed in the accommodating space, the movable scroll is installed at the lower end of the fixed scroll, the movable scroll is meshed with the fixed scroll, a compression chamber is formed between the fixed scroll and the movable scroll, and the compression chamber is communicated with the lower end of the exhaust passage; A stop valve assembly, the stop valve assembly being mounted at an upper end of the exhaust passage; A pressure differential unloading valve, wherein the pressure differential unloading valve is installed on the fixed scroll plate; Wherein, the pressure differential unloading valve comprises: An unloading channel, wherein the unloading channel is arranged on an upper portion of the fixed scroll; a first gas channel, the first gas channel being communicated with one end of the unloading channel, and the first gas channel being connected with the exhaust channel; a second gas channel, one end of the second gas channel being in communication with the high pressure chamber, and the other end of the second gas channel being in communication with the middle portion of the unloading channel; a third gas passage, one end of which is in communication with the other end of the unloading passage, and the other end of which is in communication with the outer edge of the compression chamber away from the axis of the fixed scroll; A spring, one end of which is fixed to the other end of the unloading channel; A double-headed piston valve assembly, wherein the double-headed piston valve assembly can be slidably installed in the unloading channel, one end of the double-headed piston valve assembly is fixedly connected to the other end of the spring, and the other end of the double-headed piston valve assembly can be operably pressed against the connection between the first gas channel and the unloading channel.

2. The compressor with a pressure differential unloading valve according to claim 1, It is characterized in that A channel hole is provided on the upper part of the static scroll disk, and the channel hole is provided along the radial direction of the static scroll disk, one end of the channel hole is connected with the exhaust channel, the axial cross-section of the channel hole is stepped, the end of the channel hole close to the exhaust channel is radially contracted to form the first gas channel, and the end of the channel hole away from the exhaust channel forms the unloading channel, the inner diameter of the unloading channel is larger than the inner diameter of the first gas channel, the radial cross-section of the unloading channel is circular, the double-headed piston valve assembly matches the unloading channel, a first through hole is provided on the upper part of the static scroll disk along the axial direction, the lower end of the first through hole is connected with the middle part of the unloading channel, the second gas channel is formed in the first through hole, a second through hole is provided in the unloading channel near the outer edge of the compression chamber in the vertical direction, the lower end of the second through hole is connected with the compression chamber, and the third gas channel is formed in the second through hole.

3. The compressor with a pressure differential unloading valve according to claim 2, It is characterized in that Also includes: A sealing piece is provided at the other end of the channel hole, wherein one end of the sealing piece close to the channel hole is fixedly connected to one end of the spring, and a sealing strip is fixedly provided at the outer edge of the sealing piece, and the sealing strip is tightly attached to the outer edge of the other end of the channel hole.

4. The compressor with a pressure differential unloading valve according to claim 1, It is characterized in that The length of the double-headed piston valve assembly along the axial direction of the unloading passage is smaller than the length from one end of the unloading passage to the axis of the second gas passage.

5. The compressor with a pressure differential unloading valve according to claim 1, It is characterized in that The double-headed piston valve assembly includes a first piston head, a connecting rod, and a second piston head which are connected in sequence. The first piston head can be operably blocked at the connection between the first gas channel and the unloading channel, and the second piston head is connected to the other end of the spring.

6. The compressor having a pressure differential unloading valve according to claim 5, It is characterized in that The area of ​​the radial cross section of the first piston head, the area of ​​the radial cross section of the second piston head, and the area of ​​the radial cross section of the connecting rod are all equal.

7. The compressor having a pressure differential unloading valve according to claim 5, It is characterized in that The first piston head and the second piston head are both arranged in a cylindrical shape, and the central axis of the first piston head, the central axis of the connecting rod, the central axis of the second piston head and the central axis of the unloading channel are all arranged coaxially.

8. The compressor having a pressure differential unloading valve according to claim 7, It is characterized in that The first piston head and the second piston head are both provided with an annular groove along the annular direction, and an O-shaped sealing ring or a piston ring with a notch is installed in the annular groove.

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