Piston slide valve for compressor and compressor

Abstract

The utility model relates to a piston slide valve for a compressor and the compressor. The check valve comprises a valve body and a valve shaft, and is characterized by further comprising a valve guide ring piece, a guide block, a guide ring and a Glyd ring, the valve shaft is installed in a sliding valve cavity of the valve body in a sliding mode, a guide groove is formed in the shaft extension end of the valve shaft, and the guide block is fixed to the valve body; the valve shaft divides a slide valve cavity of the valve body into an independent piston cavity and an air chamber; the valve guide ring piece is fixed at the rear end of the valve shaft; the guide ring and the Glyd ring are respectively arranged in a guide ring groove and a Glyd ring groove of the valve guide ring piece; a piston cavity of the valve body is divided into a first piston sliding valve cavity and a second piston sliding valve cavity which are mutually independent through the valve guide ring piece, the first piston sliding valve cavity is provided with a first pressure fluid inlet and a first pressure fluid outlet, and the second piston sliding valve cavity is provided with a second pressure fluid inlet and a second pressure fluid outlet. The compressor is reasonable in structural design and convenient to maintain, and the starting current of the compressor can be reduced.

Description

Technical Field

[0001] The utility model relates to a piston slide valve for a compressor and a compressor, belonging to the technical field of piston slide valves, and can reduce the impact on a power grid when the compressor is started. Background Art

[0002] When multiple compressors are combined together to form a compressor unit for use, the power requirement is relatively high. Theoretically, a power grid with a threshold of 1000Kw can drive 10 100Kw compressors, but in reality it can only drive 6-9 100Kw compressors at most. This is because the torque of the compressor at startup is much greater than the torque during normal operation, which causes the current required for the compressor to start to increase sharply, making it impossible for the compressor unit to start normally, and thus resulting in the inability to use the power grid to the maximum extent for work.

[0003] Currently, the main approach to this problem is to add a movable sliding valve to the screw section during the machine development phase. This application results in a large machine size, and subsequent maintenance is time-consuming and labor-intensive, and maintenance cannot be performed during field operations. Utility Model Content

[0004] The purpose of the utility model is to overcome the above-mentioned deficiencies in the prior art and to provide a piston slide valve for a compressor and a compressor which have a reasonable structural design, are easy to maintain and can reduce the starting current of the compressor.

[0005] The technical solution adopted by the utility model to solve the above-mentioned problem is: the piston sliding valve for the compressor includes a valve body, a valve shaft and a rear cover, the rear cover is fixed to the rear end of the valve body, and its structural characteristics are: it also includes a valve guide ring, a guide block, a positioning member, a guide ring and a Gley ring, the front end of the valve body is provided with a connecting surface, the interior of the valve body is provided with a sliding valve cavity, the valve shaft is slidably installed in the sliding valve cavity of the valve body, the front end of the valve shaft is an extension end, the extension end extends outside the valve body, the outer wall of the extension end is provided with an axially arranged guide groove, the guide block is fixed to the valve body by a positioning member, the guide block and the guide groove cooperate; the valve shaft divides the sliding valve cavity of the valve body into The valve body is divided into a piston chamber and an air chamber which are independent of each other. The air chamber is provided with an air chamber inlet and an air chamber outlet, and the air chamber inlet is located on the connecting surface of the valve body; the valve guide ring is fixed to the rear end of the valve shaft, and the outer wall of the valve guide ring is provided with a guide ring groove and a grid ring groove, and the guide ring and the grid ring are respectively installed in the guide ring groove and the grid ring groove of the valve guide ring; the valve guide ring separates the piston chamber of the valve body into a No. 1 piston slide valve chamber and a No. 2 piston slide valve chamber which are independent of each other, the No. 1 piston slide valve chamber is provided with a No. 1 pressure fluid inlet and a No. 1 pressure fluid outlet, and the No. 2 piston slide valve chamber is provided with a No. 2 pressure fluid inlet and a No. 2 pressure fluid outlet.

[0006] Preferably, the piston sliding valve of the utility model further comprises a pressing block and bolts, and the valve guide ring is fixed to the rear end of the valve shaft by the pressing block and the bolts.

[0007] Preferably, the No. 1 pressure fluid outlet and the No. 2 pressure fluid outlet of the utility model are both provided with sensors.

[0008] Preferably, the No. 1 pressure fluid inlet and the No. 1 pressure fluid outlet in the No. 1 piston sliding valve chamber of the utility model are both arranged on the rear cover.

[0009] Preferably, the No. 2 pressure fluid inlet and the No. 2 pressure fluid outlet in the No. 2 piston sliding valve chamber of the utility model are both arranged on the side wall of the valve body.

[0010] Preferably, the positioning member of the utility model is a rod-shaped structure.

[0011] A compressor, whose structural features are: it includes a piston slide valve for the compressor, the piston slide valve is fixed on the compressor through a connecting surface, the air chamber inlet in the piston slide valve is connected to the sealing cavity of the compressor, and the air chamber outlet in the piston slide valve is connected to the air inlet of the compressor.

[0012] Preferably, the connecting surface of the piston sliding valve of the utility model is fixed to the compressor by bolts.

[0013] Compared with the prior art, the utility model has the following advantages and effects: the piston slide valve can be applied to different types of compressors and can effectively reduce the starting current of the compressor; and the compressor that has been assembled can achieve the expected effect of reducing the starting current after installing the piston slide valve in the utility model without changing the original main body design. After experimental verification, the response of the piston slide valve is very timely. In special working environments, such as when the working medium of the compressor is a special gas that is not allowed to mix with oil, the piston slide valve does not need to be injected with hydraulic oil in the No. 1 piston slide valve cavity and the No. 2 piston slide valve cavity of the piston slide valve, and can be driven by injecting gas, and has a wide range of applications. The volume of the piston slide valve is significantly smaller than that of the existing compressor integrated slide valve body structure, making the compressor lighter as a whole; the piston slide valve is easy to inspect and replace, and can be operated by a single person.

[0014] The utility model uses a grid ring, a guide ring and a valve guide ring, and a guide groove is set at the front end of the valve shaft, that is, there are guide devices at both ends of the valve shaft, so that the valve shaft moves more smoothly without a stuck point; when used in a large-displacement machine, the current can be adjusted by increasing the number of the piston slide valve, so it can be applied to compressors of large and small displacements. The control logic of the utility model is only two places, namely, the sensors set at the No. 1 pressure fluid outlet and the No. 2 pressure fluid outlet, which belongs to the one-way logic control of the inlet and outlet of the hydraulic oil (or gas), and has low professional level requirements for users, which is more convenient for promotion and application. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model and / or the technical solutions in the prior art, the drawings required for use in the embodiments and / or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a schematic cross-sectional structure diagram of a piston slide valve used for a compressor in an embodiment of the utility model.

[0017] Figure 2 It is a three-dimensional structural schematic diagram of a piston slide valve used for a compressor in an embodiment of the utility model.

[0018] Figure 3 It is a three-dimensional structural schematic diagram from another perspective of a piston slide valve for a compressor in an embodiment of the utility model.

[0019] In the figure: 1-valve body; 2-valve shaft; 3-back cover; 4-valve guide ring; 5-pressure block; 6-bolt; 7-guide block; 8-positioning piece; 9-guide ring; 10-Glay ring; 11-guide groove; 12-No. 1 piston slide valve cavity; 13-air chamber inlet; 14-air chamber outlet; 15-No. 2 piston slide valve cavity; 16-No. 2 pressure fluid inlet; 17-No. 2 pressure fluid outlet; 18-No. 1 pressure fluid inlet; 19-No. 1 pressure fluid outlet; 20-connecting surface; 21-air chamber; 22-shaft extension end. DETAILED DESCRIPTION

[0020] The present invention will be further described in detail below with reference to the accompanying drawings and through examples. The following examples are provided to explain the present invention, but the present invention is not limited to the following examples.

[0021] Example

[0022] See also Figures 1 to 3In this embodiment, the piston slide valve for the compressor includes a valve body 1, a valve shaft 2, a rear cover 3, a valve guide ring 4, a pressure block 5, a bolt 6, a guide block 7, a positioning member 8, a guide ring 9 and a grid ring 10. Among them, the positioning member 8 in this embodiment is a rod-shaped structure. Of course, the positioning member 8 can also adopt other types of structures, such as bolts, screws, etc.

[0023] The rear cover 3 in this embodiment is fixed to the rear end of the valve body 1, and the front end of the valve body 1 is provided with a connecting surface 20. The valve body 1 is provided with a sliding valve cavity inside, and the valve shaft 2 is slidably installed in the sliding valve cavity of the valve body 1. The front end of the valve shaft 2 is an extension end 22, and the extension end 22 extends outside the valve body 1. The outer wall of the extension end 22 is provided with an axially arranged guide groove 11. The guide block 7 is fixed to the valve body 1 through a positioning member 8. The guide block 7 cooperates with the guide groove 11. When the valve shaft 2 moves, the guide groove 11 on the valve shaft 2 will slide along the guide block 7, thereby playing a guiding role. The protruding part of the guide block 7 is inserted into the guide groove 11 corresponding to the front end of the valve shaft 2, ensuring that the spatial position of the piston slide valve can only move in the axial direction, so as to ensure that the extension end 22 of the valve shaft 2 of the piston slide valve will not interfere with the compressor when inserted into the compressor.

[0024] The valve shaft 2 in this embodiment divides the sliding valve cavity of the valve body 1 into a piston cavity and an air chamber 21 which are independent of each other. The air chamber 21 is provided with an air chamber inlet 13 and an air chamber outlet 14 . The air chamber inlet 13 is located on the connecting surface 20 of the valve body 1 .

[0025] The valve guide ring 4 in this embodiment is fixed to the rear end of the valve shaft 2. Normally, the valve guide ring 4 is fixed to the rear end of the valve shaft 2 by means of a pressure block 5 and a bolt 6. The outer wall of the valve guide ring 4 is provided with a guide ring groove and a Gley ring groove, and the guide ring 9 and the Gley ring 10 are respectively installed in the guide ring groove and the Gley ring groove of the valve guide ring 4; the inner hole of the valve guide ring 4 is matched with the shaft corresponding to the rear end of the valve shaft 2 with a transition tolerance to ensure the coaxiality of the valve guide ring 4 and the valve shaft 2, and to ensure that the guide ring 9 moves smoothly during operation. The valve guide ring 4 divides the piston chamber of the valve body 1 into a mutually independent No. 1 piston slide valve chamber 12 and No. 2 piston slide valve chamber 15, the No. 1 piston slide valve chamber 12 is provided with a No. 1 pressure fluid inlet 18 and a No. 1 pressure fluid outlet 19, and the No. 2 piston slide valve chamber 15 is provided with a No. 2 pressure fluid inlet 16 and a No. 2 pressure fluid outlet 17. Sensors are usually provided at the No. 1 pressure fluid outlet 19 and the No. 2 pressure fluid outlet 17.

[0026] In this embodiment, the No. 1 pressure fluid inlet 18 and the No. 1 pressure fluid outlet 19 in the No. 1 piston slide valve chamber 12 are both arranged on the rear cover 3, and the No. 2 pressure fluid inlet 16 and the No. 2 pressure fluid outlet 17 in the No. 2 piston slide valve chamber 15 are both arranged on the side wall of the valve body 1. The No. 1 pressure fluid inlet 18 and the No. 1 pressure fluid outlet 19 can take in and out hydraulic oil, which is used to drive the valve shaft 2 to move. The hydraulic oil enters the No. 1 piston slide valve chamber 12 through the No. 1 pressure fluid inlet 18. At this time, the sensor at the No. 2 pressure fluid outlet 17 receives a signal, opens the channel, squeezes out the hydraulic oil in the No. 2 piston slide valve chamber 15, and pushes the valve shaft 2 to move toward the shaft extension end 22 to allow the compressor to compress the gas normally. Of course, the No. 1 pressure fluid inlet 18 and the No. 1 pressure fluid outlet 19 can also take in and out the pressurized gas used to drive the valve shaft 2 to move. The No. 2 pressure fluid inlet 16 and the No. 2 pressure fluid outlet 17 allow hydraulic oil to enter and exit, which is used to drive the valve shaft 2 to move. The hydraulic oil enters the No. 2 piston slide valve cavity 15 through the No. 2 pressure fluid inlet 16. At this time, the sensor at the No. 1 pressure fluid outlet 19 receives a signal, opens the channel, squeezes out the hydraulic oil in the No. 1 piston slide valve cavity 12, and pushes the valve shaft 2 to move to the rear end.

[0027] The assembly process of the piston slide valve in this embodiment is as follows: the valve shaft 2 is placed vertically with the front end of the valve shaft 2 facing downward, the valve guide ring 4 is passed through the middle hole on the shaft at the rear end of the valve shaft 2, the pressure block 5 is placed in the circular groove in the middle part of the valve guide ring 4 and fastened with bolts 6 to form a whole, the guide ring 9 is installed into the corresponding guide ring groove of the valve shaft 2 through a tool (such as a four-claw expansion device), and provides a guiding effect and the first stage of pressure reduction when the valve shaft 2 moves; the grid ring 10 is installed into the grid ring groove corresponding to the valve shaft 2 through a tool (such as a four-claw expansion device), which plays a sealing role and isolates the pressure fluid (such as hydraulic oil, pressure gas) of the piston slide valve from contacting with the compressed gas. The above-assembled parts are installed as a whole into the slide valve cavity inside the valve body 1, the valve shaft 2 is rotated, the valve shaft 2 is adjusted to the position corresponding to the guide groove 11 and the guide block 7, the guide block 7 is installed to the corresponding position of the valve body 1, the positioning member 8 is knocked into the circular hole in the middle of the guide block 7, and the back cover 3 is connected to the valve body 1 with bolts.

[0028] The compressor in this embodiment includes a piston slide valve for the compressor, the piston slide valve is fixed to the compressor via a connection surface 20, the air chamber inlet 13 in the piston slide valve is communicated with the sealed cavity of the compressor, and the air chamber outlet 14 in the piston slide valve is communicated with the air inlet of the compressor. The connection surface 20 of the piston slide valve is usually fixed to the compressor via bolts.

[0029] The working mode of the compressor in this embodiment is as follows: the connecting surface 20 of the piston slide valve is connected to one side of the compressor with bolts, the No. 2 pressure fluid inlet 16 is opened, that is, the oil inlet channel is opened, and the hydraulic oil used for driving enters the No. 2 piston slide valve chamber 15 from the channel, and at the same time, the sensor at the No. 1 pressure fluid outlet 19 receives a signal, and the No. 1 pressure fluid outlet 19 is opened, that is, the oil outlet channel is opened, and the hydraulic oil in the No. 1 piston slide valve chamber 12 is squeezed out; when the compressor is started, since the sealing cavity of the compression body is connected to the air chamber inlet 13 of the piston slide valve, the gas in the sealing cavity of the compressor enters the air chamber 21 through the air chamber inlet 13 of the piston slide valve, and then returns to the air inlet of the compressor through the air chamber outlet 14. In this way, the load when the compressor is started is only the compressor rotor itself, and the gas power is not included at this time, thereby greatly reducing the current required when the compressor is started, thereby achieving the maximum use of the power grid, and effectively solving the problem that 1000Kw electricity can only drive 6-9 100Kw compressors to start. Of course, the hydraulic oil used for driving can also be replaced by gas.

[0030] In addition, it should be noted that the shapes and names of the parts and components of the specific embodiments described in this specification may be different, and the above content described in this specification is only an example of the structure of the utility model. All equivalent changes or simple changes made based on the structure, features and principles described in the patent concept of the utility model are included in the protection scope of the utility model patent. Technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar manner, as long as they do not deviate from the structure of the utility model or exceed the scope defined by the claims, they should all fall within the protection scope of the utility model.

Claims

1. A piston slide valve for a compressor, comprising a valve body (1), a valve shaft (2) and a rear cover (3), wherein the rear cover (3) is fixed to the rear end of the valve body (1), and is characterized in that: The valve body (1) further comprises a valve guide ring (4), a guide block (7), a positioning member (8), a guide ring (9) and a Gly ring (10); the front end of the valve body (1) is provided with a connecting surface (20); the interior of the valve body (1) is provided with a sliding valve cavity; the valve shaft (2) is slidably mounted in the sliding valve cavity of the valve body (1); the front end of the valve shaft (2) is an extension end (22); the extension end (22) extends outside the valve body (1); the outer wall of the extension end (22) is provided with an axially arranged guide groove (11); the guide block (7) is fixed to the valve body (1) through the positioning member (8); the guide block (7) and the guide groove (11) cooperate; the valve shaft (2) divides the sliding valve cavity of the valve body (1) into a piston cavity and an air chamber (21) which are independent of each other; the air chamber (21) is provided with an air chamber inlet (13) ) and an air chamber outlet (14), the air chamber inlet (13) being located on the connecting surface (20) of the valve body (1); the valve guide ring (4) being fixed to the rear end of the valve shaft (2), the outer wall of the valve guide ring (4) being provided with a guide ring groove and a grid ring groove, the guide ring (9) and the grid ring (10) being respectively installed in the guide ring groove and the grid ring groove of the valve guide ring (4); the valve guide ring (4) dividing the piston chamber of the valve body (1) into a first piston slide valve chamber (12) and a second piston slide valve chamber (15) which are independent of each other, the first piston slide valve chamber (12) being provided with a first pressure fluid inlet (18) and a first pressure fluid outlet (19), the second piston slide valve chamber (15) being provided with a second pressure fluid inlet (16) and a second pressure fluid outlet (17).

2. The piston slide valve for a compressor according to claim 1, characterized in that: The piston slide valve further comprises a pressing block (5) and a bolt (6), and the valve guide ring (4) is fixed to the rear end of the valve shaft (2) via the pressing block (5) and the bolt (6).

3. The piston slide valve for a compressor according to claim 1, characterized in that: The first pressure fluid outlet (19) and the second pressure fluid outlet (17) are both provided with sensors.

4. The piston slide valve for a compressor according to claim 1, characterized in that: The No. 1 pressure fluid inlet (18) and the No. 1 pressure fluid outlet (19) in the No. 1 piston slide valve chamber (12) are both arranged on the rear cover (3).

5. The piston slide valve for a compressor according to claim 1, characterized in that: The No. 2 pressure fluid inlet (16) and the No. 2 pressure fluid outlet (17) in the No. 2 piston slide valve chamber (15) are both arranged on the side wall of the valve body (1).

6. The piston slide valve for a compressor according to claim 1, characterized in that: The positioning member (8) is a rod-shaped structure.

7. A compressor, characterized in that: The invention comprises a piston slide valve for a compressor as claimed in any one of claims 1 to 6, wherein the piston slide valve is fixed to the compressor via a connecting surface (20), an air chamber inlet (13) in the piston slide valve is connected to a sealing cavity of the compressor, and an air chamber outlet (14) in the piston slide valve is connected to an air inlet of the compressor.

8. The compressor according to claim 7, characterized in that: The connecting surface (20) of the piston slide valve is fixed to the compressor by means of bolts.

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