Oil concentration detection device for scroll compressor

Abstract

The utility model discloses an oil concentration detection device for a scroll compressor, and relates to the technical field of compressor lubricating oil concentration detection, in particular to a device for detecting the concentration of lubricating oil in an oil pool of the scroll compressor used for a heat pump air conditioning system. The device comprises a connecting device, a sampling device, a concentration testing and calculating device and a scroll compressor, the connecting device is welded at the bottom of the scroll compressor; the sampling device is of a detachable structure and is assembled on the connecting device to sample the lubricating oil in the scroll compressor during sampling; the concentration testing and calculating device is arranged outside the scroll compressor, is used for testing and calculating the lubricating oil collected by the sampling device, and is not connected with the scroll compressor. According to the technical scheme of the utility model, the problems that in the prior art, a viscometer is adopted for testing, so that a result cannot be measured in an over-range manner; the oil pool concentration is speculated by testing the temperature of the lower cover of the compressor and then through a Darnille curve, so that the test result is inaccurate.

Description

Technical Field

[0001] The oil concentration detection device for the scroll compressor of the present utility model relates to the technical field of compressor lubricating oil concentration detection, and particularly relates to an oil concentration detection device for the lubricating oil in the oil sump of a scroll compressor used in a heat pump air-conditioning system. Background Art

[0002] At present, scroll compressors are applied in more and more extensive fields, with more and more complex application scenarios and a wider range of operating environmental temperatures. This has also led to increasingly strict requirements for the reliability of scroll compressors. It is necessary to ensure both the use effect and its long service life. One of the most critical factors affecting the compressor life is the lubrication effect of mechanical components, that is, the oil content in the oil sump. Therefore, the test of oil concentration is very crucial.

[0003] Usually, a viscometer is used to test the concentration of the oil sump. However, the viscometer is restricted by the high cost of the equipment and the narrow viscosity test range, and often there is a situation where the result cannot be measured due to over-range. Therefore, its use has great limitations and has not been widely promoted. There is also a method of inferring the oil sump concentration through the test of the temperature of the lower cover of the compressor and using the Darnel curve. However, there is a deviation between the temperature of the lower cover and the internal temperature of the oil sump, resulting in inaccurate test results.

[0004] In view of the problems existing in the above-mentioned prior art, it is very necessary to research and design a new oil concentration detection device for scroll compressors to overcome the problems existing in the prior art. Summary of the Invention

[0005] In view of the technical problems of over-range and inability to measure results when using a viscometer for testing, and inaccurate test results due to inferring the oil sump concentration through the test of the temperature of the lower cover of the compressor and using the Darnel curve proposed in the above-mentioned prior art, an oil concentration detection device for a scroll compressor is provided. The present utility model mainly detects the oil sump concentration by directly testing the concentration of the compressor oil sump. The operation process is simple, efficient, and accurate. Good results have been obtained through the test of actual heat pump air-conditioning units, providing accurate data support for the reliability evaluation of the compressor.

[0006] The technical means adopted by the present utility model are as follows:

[0007] An oil concentration detection device for a scroll compressor includes: a connecting device, a sampling device, a concentration test and calculation device, and a scroll compressor;

[0008] Further, the connecting device is welded to the bottom of the scroll compressor;

[0009] Further, the sampling device is a detachable structure and is assembled on the connecting device during sampling to sample the lubricating oil in the scroll compressor;

[0010] Furthermore, the concentration test calculation device is arranged outside the scroll compressor, tests and calculates the lubricating oil collected by the sampling device, and is not connected to the scroll compressor.

[0011] Furthermore, the connecting device includes a sampling tube, a sampling tube sealing ball valve A, and a connecting tube that are connected in sequence;

[0012] Furthermore, the sampling tube is welded to the bottom of the scroll compressor and communicates with the lowest point of the bottom of the oil sump;

[0013] Furthermore, the sampling tube operates together with the scroll compressor, and is fixed to prevent the sampling tube from being broken by vibration, resulting in leakage of refrigerant and oil.

[0014] Furthermore, the sampling tube is a copper tube with an inner diameter of 6.35 mm.

[0015] Furthermore, the sampling device includes a sampling tube sealing ball valve B, a sample container, and a vacuum ball valve that are connected in sequence;

[0016] Furthermore, the sampling device is connected to the connecting tube through the sampling tube sealing ball valve B;

[0017] Furthermore, the sample container is used to hold the oil sample collected from the oil sump.

[0018] Furthermore, before assembling the sampling device, its interior is evacuated.

[0019] Furthermore, the degree of vacuum in the sample container is 0.05 Torr.

[0020] Furthermore, the internal volume of the sample container is 200 ml - 500 ml.

[0021] Furthermore, the concentration test calculation device includes a weighing container and an electric heating tape arranged outside the weighing container.

[0022] Furthermore, the internal volume of the weighing container ≥ the internal volume of the sample container.

[0023] Furthermore, the power of the electric heating tape is 44 W.

[0024] The detection process of the present utility model is as follows:

[0025] 1. Evacuate the sample container through the vacuum ball valve, control the degree of vacuum in the sample container at 0.05 Torr, and then connect the sampling device to the connecting device;

[0026] 2. Open the sampler sealing ball valves A and B, and suck the lubricating oil in the oil sump into the sampling container through the negative pressure in the sampling container;

[0027] 3. Close the sampler seal ball valves A and B and remove the sampling device;

[0028] 4. Measure the solution concentration in the sampling device through the concentration test calculation device: Record the weight of the sampling device before sampling to obtain the weight value W1; Record the weight after collecting the solution sample to obtain the weight value W2; Record the weight when emptying the sample in the sampling device into the concentration test calculation device to obtain the weight value W3; Record the weight of the concentration test calculation device when not in use to obtain the weight value W4; Record the weight of the refrigerant evaporated from the sample in the sampling device through the electric heating tape to obtain the weight value W5.

[0029] 5. Calculate the solution concentration in the sampling device through the concentration test calculation device: Through the oil concentration calculation formula, [(W5 - W4)+(W3 - W1)] / (W2 - W1), the accurate oil sump concentration value can be calculated.

[0030] Compared with the prior art, the present utility model has the following advantages:

[0031] The oil concentration detection device for a scroll compressor provided by the present utility model accurately obtains the true oil concentration of the compressor oil sump through a direct test scheme for the oil sump concentration, optimizes the portability, accuracy, and economy of the sampling device, and is conveniently applicable to the oil concentration detection of scroll compressors operating under different working conditions.

[0032] In summary, the technical solution of the present utility model solves the problems in the prior art that when using a viscometer for testing, the result cannot be measured due to over-range; when inferring the oil sump concentration through the temperature test of the compressor lower cover and then through the Daniel curve, the test result is inaccurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0034] Figure 1 It is a schematic structural diagram of the present utility model;

[0035] Figure 2 It is a schematic structural diagram of the connecting device of the present utility model;

[0036] Figure 3 It is a schematic structural diagram of the sampling device of the present utility model;

[0037] Figure 4This is a schematic structural diagram of the concentration test and calculation device of the present utility model.

[0038] In the figure: 1. Sampling tube; 2. Sampling tube sealing ball valve A; 3. Connecting tube; 4. Sampler sealing ball valve B; 5. Sample container; 6. Ball valve for vacuum; 7. Weighing container; 8. Electric heating tape; 9. Scroll compressor. Specific embodiments

[0039] It should be noted that, without conflict, the embodiments in the present utility model and the features in the embodiments can be combined with each other. The present utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0040] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part rather than all of the embodiments of the present utility model. The description of at least one exemplary embodiment below is actually only illustrative and in no way restricts the present utility model and its application or use. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present utility model without creative efforts fall within the scope of protection of the present utility model.

[0041] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present utility model. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of the described features, steps, operations, devices, components and / or their combinations.

[0042] Unless otherwise specifically stated, the relative arrangements of the components and steps, numerical expressions and values set forth in these embodiments do not limit the scope of the present utility model. At the same time, it should be clear that, for the convenience of description, the dimensions of the various parts shown in the drawings are not drawn in actual proportional relationships. Technologies, methods and devices known to those of ordinary skill in the relevant fields may not be discussed in detail, but where appropriate, the said technologies, methods and devices should be regarded as part of the authorized specification. In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following drawings, and thus, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0043] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by orientation terms such as "front, rear, upper, lower, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom", etc. is usually based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description. Without contrary explanation, these orientation terms do not indicate and imply that the device or component referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation on the protection scope of the present utility model: The orientation terms "inside, outside" refer to the inside and outside relative to the contour of each component itself.

[0044] For the convenience of description, spatial relative terms such as "above...", "over...", "on the upper surface of...", "upper...", etc. can be used here to describe the spatial positional relationship between a device or feature shown in the drawings and other devices or features. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation described in the drawings for the device. For example, if the device in the drawing is inverted, the device described as "above other devices or structures" or "over other devices or structures" will then be positioned as "below other devices or structures" or "under other devices or structures". Thus, the exemplary term "above..." can include both the orientations of "above..." and "below...". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and corresponding interpretations should be made for the spatial relative descriptions used here.

[0045] In addition, it should be noted that the use of words such as "first", "second", etc. to limit the components is only for the convenience of distinguishing the corresponding components. Without additional statement, the above words have no special meaning. Therefore, it should not be construed as a limitation on the protection scope of the present utility model.

[0046] As Figures 1-4 shown, the present utility model provides an oil concentration detection device for a scroll compressor, including: a sampling tube 1, a sampling tube sealing ball valve A 2, a connecting tube 3, a sampler sealing ball valve B 4, a sample container 5, a vacuum ball valve 6, a weighing container 7 and an electric heating tape 8.

[0047] Among them, the sampling tube 1 needs to be welded in advance at the bottom of the oil sump of the scroll compressor 9. Select the lowest point of the oil sump. The sampling tube 1 is made of a copper tube with a diameter of 6.35 mm. The sampling tube sealing ball valve A 2 and the connecting tube 3 are connected to the sampling tube 1 and need to be always installed on the compressor and operate together with the compressor. Therefore, it is necessary to do a good job of fixing to prevent the copper tube from being broken by vibration, resulting in the leakage of refrigerant and oil.

[0048] The sampler sealing ball valve B4, the sample container 5, and the vacuum ball valve 6 are connected in sequence and used during concentration testing. Before use, the inside of the sample container 5 needs to be evacuated to a vacuum state through the vacuum ball valve 6, and the required vacuum degree is 0.05 Torr. The sample container 5 is selected according to the oil sump size of the scroll compressor 9, and it is usually recommended that the internal volume be between 200 ml and 500 ml.

[0049] The weighing container 7 and the electric heating tape 8 are used during concentration measurement and calculation. It is recommended that the internal volume of the weighing container 7 be more than 600 ml, not less than the internal volume of the sample container 5. The power of the electric heating tape 8 is 44 W, and it is wound around the outside of the weighing container 7 to evaporate the refrigerant in the oil.

[0050] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. An oil concentration detection device for a scroll compressor, characterized in that: The scroll compressor oil concentration detection device comprises: a connecting device, a sampling device, a concentration test calculation device and a scroll compressor (9); The connecting device is welded to the bottom of the scroll compressor (9); The sampling device is a detachable structure, and is assembled on the connecting device to sample the lubricating oil in the scroll compressor (9); The concentration test and calculation device is arranged outside the scroll compressor (9) to perform test and calculation on the lubricating oil collected by the sampling device, and is not connected to the scroll compressor (9).

2. The scroll compressor oil concentration detection device according to claim 1, characterized in that: The connecting device comprises a sampling tube (1), a sampling tube sealing ball valve A (2) and a connecting tube (3) which are connected in sequence; The sampling tube (1) is welded to the bottom of the scroll compressor (9) and communicates with the lowest point of the bottom of the oil pool; The sampling tube (1) operates together with the scroll compressor (9) and is properly fixed to prevent the sampling tube (1) from being broken by vibration, thereby leaking refrigerant and oil.

3. The scroll compressor oil concentration detection device according to claim 2, characterized in that: The sampling tube (1) is a copper tube with an inner diameter of 6.35 mm.

4. The scroll compressor oil concentration detection device according to claim 1, characterized in that: The sampling device comprises a sampling tube sealing ball valve B (4), a sample container (5) and a vacuum ball valve (6) which are connected in sequence; The sampling device is connected to the connecting pipe (3) via a sampling pipe sealing ball valve B (4); The sample container (5) is used to contain the oil sample collected from the oil pool.

5. The scroll compressor oil concentration detection device according to claim 4, characterized in that: Before assembling the sampling device, the interior thereof is subjected to a vacuum treatment.

6. The scroll compressor oil concentration detection device according to claim 4, characterized in that: The sample container (5) has a vacuum degree of 0.05 Torr.

7. The scroll compressor oil concentration detection device according to claim 4, characterized in that: The content volume of the sample container (5) is 200ml-500ml.

8. The scroll compressor oil concentration detection device according to claim 1, characterized in that: The concentration test calculation device comprises a weighing container (7) and an electric heating belt (8) arranged outside the weighing container (7).

9. The scroll compressor oil concentration detection device according to claim 8, characterized in that: The internal volume of the weighing container (7) is greater than or equal to the internal volume of the sample container (5).

10. The scroll compressor oil concentration detection device according to claim 8, characterized in that: The power of the electric heating belt (8) is 44W.

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