Two-position two-way proportional throttle electromagnetic valve with zero leakage pressure compensation

Abstract

The invention discloses a two-position two-way proportional throttling electromagnetic valve with zero-leakage pressure compensation. The two-position two-way proportional throttling electromagnetic valve comprises a valve sleeve, a main valve element and a compensation valve element. A pressure medium inlet and a pressure medium outlet are formed in the valve sleeve, and a through cavity communicated with the pressure medium inlet and the pressure medium outlet is formed in the valve sleeve; the main valve element and the compensation valve element are located in the through cavity. A spring cavity is arranged in the valve sleeve, the rear end of the compensation valve core extends into the spring cavity, a compensation spring is sleeved at the rear end of the compensation valve core, and a passage communicated with the pressure medium inlet and the spring cavity is arranged on the inner wall of the valve sleeve. According to the two-position two-way proportional throttling electromagnetic valve with the zero-leakage pressure compensation function, the pressure compensation function is integrated into the throttling electromagnetic valve through the integrated design, the cost for independently installing a pressure compensator is saved, occupied space is also reduced, and the electromagnetic valve is convenient to use. And constant pressure difference can be realized in the electromagnetic valve sleeve, so that the service life of the electromagnetic valve can be prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic valves, and in particular relates to a two-position two-way proportional throttling electromagnetic valve with zero leakage pressure compensation. Background Art

[0002] The conventional arrangement of the existing two-position two-way proportional throttling solenoid valve is to arrange a pressure compensator separately after the solenoid valve, which makes the installation more complicated and occupies a larger space overall. In addition, the processing cost of the valve block is also high, and the overall procurement cost of the throttling solenoid valve and the compensator is high.

[0003] The existing compensator structure is a sliding valve structure, which has many leakage problems. If the pressure compensator is integrated into the throttling solenoid valve through an integrated design and a conical sealing design is adopted, the leakage behind the valve can be greatly reduced when the solenoid valve is not working.

[0004] like Figure 3 , Schematic diagram of the oil circuit of the split throttle valve and pressure compensator valve. The arrow in the figure represents the flow direction of the pressure medium. It can be seen from the figure that the split throttle valve A and the pressure compensator B adopt a split design. There is often a possibility of leakage at the connection between the two, and the two occupy a large space. Summary of the invention

[0005] The purpose of the present invention is to provide a two-position two-way proportional throttling solenoid valve with zero-leakage pressure compensation. The solenoid valve integrates the pressure compensation function into the throttling solenoid valve through an integrated design, saving the cost of installing a pressure compensator separately and reducing the space occupied. The pressure difference can be kept constant in the solenoid valve sleeve. No matter how the load after the valve changes, the flow through the throttling valve can be kept stable as much as possible, making the relationship between the flow rate of the valve and the current more linear; finally, it is also beneficial to extend the service life of the solenoid valve.

[0006] In order to achieve the above-mentioned purpose, the technical solution of the present invention is to design a two-position two-way proportional throttling solenoid valve with zero leakage pressure compensation, including a valve sleeve, a main valve core and a compensation valve core; the valve sleeve is provided with a pressure medium inlet and a pressure medium outlet, and the valve sleeve is provided with a through cavity connecting the pressure medium inlet and the pressure medium outlet; the main valve core is located on the side of the through cavity connected to the pressure medium inlet; the front end of the compensation valve core extends into the side of the through cavity connected to the pressure medium outlet; a spring cavity is also provided in the valve sleeve, the rear end of the compensation valve core extends into the spring cavity, the rear end of the compensation valve core is sleeved with a compensation spring, and the compensation spring expands and contracts as the front end of the compensation valve core moves in the through cavity; the rear end of the spring cavity is closed; the inner wall of the valve sleeve is provided with a passage connecting the pressure medium inlet and the spring cavity, and the passage is not connected to the through cavity.

[0007] Furthermore, a limit step is provided on the inner wall of the valve sleeve at the front end of the spring cavity, and both ends of the compensation spring are respectively limited between the tail end of the compensation valve core and the limit step at the front end of the spring cavity.

[0008] Furthermore, a limiting groove is provided on the front end side wall of the compensation valve core, and a spring pin is provided on the inner wall of the valve sleeve, and one end of the spring pin extends into the limiting groove.

[0009] Furthermore, the side wall of the compensation valve core is provided with a conical seal for cooperating with the limit step at the front end of the spring chamber to perform a sealing function.

[0010] Furthermore, the valve sleeve is provided with a main valve core at one end connected to a main valve stem housing, a through groove is provided in the main valve stem housing, the main valve stem is located in the through groove, and one end of the main valve stem is connected to the main valve core, and a main valve stem return spring is sleeved on the main valve stem.

[0011] The advantages and beneficial effects of the present invention are: 1) Integrating the pressure compensation function into the solenoid valve reduces costs and space requirements.

[0012] 2) The pressure difference in the solenoid valve sleeve is constant. No matter how the load behind the valve changes, the flow through the throttle valve can be kept stable, making the relationship between the flow and current of the valve more linear; finally, it is also beneficial to extend the service life of the solenoid valve.

[0013] 3) Conical seal design can greatly reduce leakage behind the valve when the solenoid valve is not working. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of state 1 of the present invention.

[0015] Figure 2 It is a structural schematic diagram of state 2 of the present invention.

[0016] Figure 3 It is a schematic diagram of the oil circuit of the split throttle valve and pressure compensator valve in the prior art.

[0017] Among them, main valve core 1, valve sleeve 2, compensation valve core 3, compensation spring 4, pressure medium inlet 5, pressure medium outlet 6, passage 7, through cavity 8, spring pin 9, compensation spring pressure end 10, cone seal 11, main valve stem housing 12, main valve stem 13, main valve stem reset spring 14, split throttling solenoid valve A, and pressure compensator B. DETAILED DESCRIPTION

[0018] The specific implementation of the present invention is further described below in conjunction with the accompanying drawings and embodiments. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and cannot be used to limit the protection scope of the present invention. Example

[0019] like Figure 1 and Figure 2 As shown, a two-position two-way proportional throttling solenoid valve with zero leakage pressure compensation includes a main valve core 1, a valve sleeve 2, a compensation valve core 3, a compensation spring 4, a pressure medium inlet 5, a pressure medium outlet 6, a passage 7, a through cavity 8, a spring pin 9, a compensation spring pressure end 10, a conical seal 11, a main valve stem housing 12, a main valve stem 13, and a main valve stem reset spring 14.

[0020] A pressure medium inlet 5 and a pressure medium outlet 6 are provided on the side wall of the valve sleeve 2, and a through cavity 8 (i.e., cavity A1 in the figure) connecting the pressure medium inlet 5 and the pressure medium outlet 6 is provided in the valve sleeve 2. A main valve core 1 for opening and closing the pressure medium inlet 5 is located on one side of the through cavity 8 connecting to the pressure medium inlet 5, and a front end of the compensation valve core 3 extends into one side of the through cavity 8 connecting to the pressure medium outlet 6.

[0021] A spring cavity is also provided in the valve sleeve 2, and the rear end of the compensation valve core 3 extends into the spring cavity, and the rear end of the compensation valve core 3 is sleeved with a compensation spring 4, and the inner wall of the valve sleeve 2 is provided with a limit step at the front end of the spring cavity, and the two ends of the compensation spring 4 are respectively limited between the tail end of the compensation valve core 3 and the limit step at the front end of the spring cavity.

[0022] The rear end of the spring chamber is closed, and a compensation spring pressure end 10 is formed between the rear end of the spring chamber and the tail end of the compensation spring 4 .

[0023] The inner wall of the valve sleeve 2 is provided with a passage 7 communicating with the pressure medium inlet 5 and the spring chamber, and the passage 7 is not communicated with the through chamber 8 .

[0024] A limiting groove is provided on the front end side wall of the compensation valve core 3 , and a spring pin 9 is provided on the inner wall of the valve sleeve 2 . One end of the spring pin extends into the limiting groove to limit the movement range of the compensation valve core 3 .

[0025] The side wall of the compensation valve core 3 is provided with a conical seal 11 for cooperating with the limit step at the front end of the spring chamber to play a sealing role.

[0026] The valve sleeve 2 is provided with a main valve core 1, one end of which is connected to a main valve stem housing 12, a through groove is provided in the main valve stem housing 12, a main valve stem 13 is located in the through groove, and one end of the main valve stem 13 is connected to the main valve core 1, and a main valve stem return spring 14 is sleeved on the main valve stem 13.

[0027] like Figure 1 and Figure 2 As shown, the working process and principle of the present invention: 1) After the solenoid valve is energized, the main valve core 1 moves to the right, and the pressure medium in the pressure medium inlet 5 flows to the pressure medium outlet 6 through the through cavity 8 (i.e., the A1 cavity in the figure). At the same time, the pressure medium also flows into the spring cavity from the passage 7 (along the direction of the arrow in the figure), so that the pressure in the spring cavity and the pressure at the pressure medium inlet 5 are kept consistent; at this time, the pressure difference from the pressure medium inlet 5 to the through cavity 8 (i.e., the A1 cavity in the figure) is determined by the pressure acting on the cross section of the compensation valve core 3 after the compensation spring 4 is compressed; the pressure difference from the pressure medium inlet 5 to the through cavity 8 maintains a constant value of the spring force at that time, realizing equal pressure difference control.

[0028] 2) When the solenoid valve is not energized, the main valve core 1 closes the pressure medium inlet 5, but does not close the passage 7. At this time, the pressure of the through cavity 8 (i.e., the A1 cavity in the figure) is released from the pressure medium outlet 6, and the pressure at the pressure end 10 of the compensation spring minus the pressure of the through cavity 8 is greater than the reverse spring force generated by the compression of the compensation spring 4, causing the compensation valve core 3 to move to the right until the through cavity 8 is completely closed (i.e., the through cavity 8 and the pressure medium outlet 6 are closed), and at the same time, the conical seal 11 on the side wall of the compensation valve core 3 forms a seal with the limit step, which realizes the complete closure between the pressure medium inlet 5 and the pressure medium outlet 6.

[0029] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. Two-position two-way proportional throttling solenoid valve with zero leakage pressure compensation, characterized by: It includes a valve sleeve, a main valve core and a compensation valve core; the valve sleeve is provided with a pressure medium inlet and a pressure medium outlet, and the valve sleeve is provided with a through cavity connecting the pressure medium inlet and the pressure medium outlet; the main valve core is located on a side of the through cavity connected to the pressure medium inlet; the front end of the compensation valve core extends into a side of the through cavity connected to the pressure medium outlet; a spring cavity is also provided in the valve sleeve, the rear end of the compensation valve core extends into the spring cavity, the rear end of the compensation valve core is sleeved with a compensation spring, and the compensation spring expands and contracts as the front end of the compensation valve core moves in the through cavity; the rear end of the spring cavity is closed; the inner wall of the valve sleeve is provided with a passage connecting the pressure medium inlet and the spring cavity, and the passage is not connected to the through cavity.

2. The two-position two-way proportional throttling solenoid valve with zero leakage pressure compensation according to claim 1 is characterized in that: The inner wall of the valve sleeve is provided with a limit step at the front end of the spring cavity, and the two ends of the compensation spring are respectively limited between the tail end of the compensation valve core and the limit step at the front end of the spring cavity.

3. The two-position two-way proportional throttling solenoid valve with zero leakage pressure compensation according to claim 1 is characterized in that: A limiting groove is arranged on the front end side wall of the compensation valve core, and a spring pin is arranged on the inner wall of the valve sleeve, and one end of the spring pin extends into the limiting groove.

4. The two-position two-way proportional throttling solenoid valve with zero leakage pressure compensation according to claim 2 is characterized in that: The side wall of the compensation valve core is provided with a conical seal which cooperates with the limiting step at the front end of the spring cavity to play a sealing role.

5. The two-position two-way proportional throttling solenoid valve with zero leakage pressure compensation according to claim 1, characterized in that: The valve sleeve is provided with a main valve core at one end connected to a main valve stem housing, a through groove is provided in the main valve stem housing, the main valve stem is located in the through groove, and one end of the main valve stem is connected to the main valve core, and a main valve stem reset spring is sleeved on the main valve stem.

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